drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <asm/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.1"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0 )       /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5 )       /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          //Zero_Flag_Reg1    58
 106 #define ZLP_REG5  0x3E          //Zero_Flag_Reg5    62
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 #define USB_VENDOR_ID_MOSCHIP           0x9710
 114 #define MOSCHIP_DEVICE_ID_7840          0x7840
 115 #define MOSCHIP_DEVICE_ID_7820          0x7820
 116
 117 /* Interrupt Rotinue Defines    */
 118
 119 #define SERIAL_IIR_RLS      0x06
 120 #define SERIAL_IIR_MS       0x00
 121
 122 /*
 123  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 124  */
 125 #define SERIAL_LSR_DR       0x0001
 126 #define SERIAL_LSR_OE       0x0002
 127 #define SERIAL_LSR_PE       0x0004
 128 #define SERIAL_LSR_FE       0x0008
 129 #define SERIAL_LSR_BI       0x0010
 130
 131 #define MOS_MSR_DELTA_CTS   0x10
 132 #define MOS_MSR_DELTA_DSR   0x20
 133 #define MOS_MSR_DELTA_RI    0x40
 134 #define MOS_MSR_DELTA_CD    0x80
 135
 136 // Serial Port register Address
 137 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 138 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 139 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 140 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 141 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 142 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 143 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 144 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 145 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 146
 147 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 148 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 149
 150 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 151
 152 /*
 153  * URB POOL related defines
 154  */
 155 #define NUM_URBS                        16      /* URB Count */
 156 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 157
 158
 159 static struct usb_device_id moschip_port_id_table[] = {
 160         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 161         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 162         {}                      /* terminating entry */
 163 };
 164
 165 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 166         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 167         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 168         {}                      /* terminating entry */
 169 };
 170
 171 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 172
 173 /* This structure holds all of the local port information */
 174
 175 struct moschip_port {
 176         int port_num;           /*Actual port number in the device(1,2,etc) */
 177         struct urb *write_urb;  /* write URB for this port */
 178         struct urb *read_urb;   /* read URB for this port */
 179         __u8 shadowLCR;         /* last LCR value received */
 180         __u8 shadowMCR;         /* last MCR value received */
 181         char open;
 182         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 183         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 184         int delta_msr_cond;
 185         struct async_icount icount;
 186         struct usb_serial_port *port;   /* loop back to the owner of this object */
 187
 188         /*Offsets */
 189         __u8 SpRegOffset;
 190         __u8 ControlRegOffset;
 191         __u8 DcrRegOffset;
 192         //for processing control URBS in interrupt context
 193         struct urb *control_urb;
 194         char *ctrl_buf;
 195         int MsrLsr;
 196
 197         struct urb *write_urb_pool[NUM_URBS];
 198 };
 199
 200
 201 static int debug;
 202 static int mos7840_num_ports;   //this says the number of ports in the device
 203 static int mos7840_num_open_ports;
 204
 205
 206 /*
 207  * mos7840_set_reg_sync
 208  *      To set the Control register by calling usb_fill_control_urb function
 209  *      by passing usb_sndctrlpipe function as parameter.
 210  */
 211
 212 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 213                                 __u16 val)
 214 {
 215         struct usb_device *dev = port->serial->dev;
 216         val = val & 0x00ff;
 217         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 218
 219         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 220                                MCS_WR_RTYPE, val, reg, NULL, 0,
 221                                MOS_WDR_TIMEOUT);
 222 }
 223
 224 /*
 225  * mos7840_get_reg_sync
 226  *      To set the Uart register by calling usb_fill_control_urb function by
 227  *      passing usb_rcvctrlpipe function as parameter.
 228  */
 229
 230 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 231                                 __u16 * val)
 232 {
 233         struct usb_device *dev = port->serial->dev;
 234         int ret = 0;
 235
 236         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 237                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 238                               MOS_WDR_TIMEOUT);
 239         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 240         *val = (*val) & 0x00ff;
 241         return ret;
 242 }
 243
 244 /*
 245  * mos7840_set_uart_reg
 246  *      To set the Uart register by calling usb_fill_control_urb function by
 247  *      passing usb_sndctrlpipe function as parameter.
 248  */
 249
 250 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 251                                 __u16 val)
 252 {
 253
 254         struct usb_device *dev = port->serial->dev;
 255         val = val & 0x00ff;
 256         // For the UART control registers, the application number need to be Or'ed
 257         if (mos7840_num_ports == 4) {
 258                 val |=
 259                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 260                      1) << 8;
 261                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 262         } else {
 263                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 264                         val |=
 265                             (((__u16) port->number -
 266                               (__u16) (port->serial->minor)) + 1) << 8;
 267                         dbg("mos7840_set_uart_reg application number is %x\n",
 268                             val);
 269                 } else {
 270                         val |=
 271                             (((__u16) port->number -
 272                               (__u16) (port->serial->minor)) + 2) << 8;
 273                         dbg("mos7840_set_uart_reg application number is %x\n",
 274                             val);
 275                 }
 276         }
 277         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 278                                MCS_WR_RTYPE, val, reg, NULL, 0,
 279                                MOS_WDR_TIMEOUT);
 280
 281 }
 282
 283 /*
 284  * mos7840_get_uart_reg
 285  *      To set the Control register by calling usb_fill_control_urb function
 286  *      by passing usb_rcvctrlpipe function as parameter.
 287  */
 288 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 289                                 __u16 * val)
 290 {
 291         struct usb_device *dev = port->serial->dev;
 292         int ret = 0;
 293         __u16 Wval;
 294
 295         //dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
 296         /*Wval  is same as application number */
 297         if (mos7840_num_ports == 4) {
 298                 Wval =
 299                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 300                      1) << 8;
 301                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 302         } else {
 303                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 304                         Wval =
 305                             (((__u16) port->number -
 306                               (__u16) (port->serial->minor)) + 1) << 8;
 307                         dbg("mos7840_get_uart_reg application number is %x\n",
 308                             Wval);
 309                 } else {
 310                         Wval =
 311                             (((__u16) port->number -
 312                               (__u16) (port->serial->minor)) + 2) << 8;
 313                         dbg("mos7840_get_uart_reg application number is %x\n",
 314                             Wval);
 315                 }
 316         }
 317         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 318                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 319                               MOS_WDR_TIMEOUT);
 320         *val = (*val) & 0x00ff;
 321         return ret;
 322 }
 323
 324 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 325 {
 326
 327         dbg("***************************************\n");
 328         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 329         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 330         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 331         dbg("***************************************\n");
 332
 333 }
 334
 335 /************************************************************************/
 336 /************************************************************************/
 337 /*             I N T E R F A C E   F U N C T I O N S                    */
 338 /*             I N T E R F A C E   F U N C T I O N S                    */
 339 /************************************************************************/
 340 /************************************************************************/
 341
 342 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 343                                             struct moschip_port *data)
 344 {
 345         usb_set_serial_port_data(port, (void *)data);
 346 }
 347
 348 static inline struct moschip_port *mos7840_get_port_private(struct
 349                                                             usb_serial_port
 350                                                             *port)
 351 {
 352         return (struct moschip_port *)usb_get_serial_port_data(port);
 353 }
 354
 355 static int mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 356 {
 357         struct moschip_port *mos7840_port;
 358         struct async_icount *icount;
 359         mos7840_port = port;
 360         icount = &mos7840_port->icount;
 361         if (new_msr &
 362             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 363              MOS_MSR_DELTA_CD)) {
 364                 icount = &mos7840_port->icount;
 365
 366                 /* update input line counters */
 367                 if (new_msr & MOS_MSR_DELTA_CTS) {
 368                         icount->cts++;
 369                 }
 370                 if (new_msr & MOS_MSR_DELTA_DSR) {
 371                         icount->dsr++;
 372                 }
 373                 if (new_msr & MOS_MSR_DELTA_CD) {
 374                         icount->dcd++;
 375                 }
 376                 if (new_msr & MOS_MSR_DELTA_RI) {
 377                         icount->rng++;
 378                 }
 379         }
 380
 381         return 0;
 382 }
 383
 384 static int mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 385 {
 386         struct async_icount *icount;
 387
 388         dbg("%s - %02x", __FUNCTION__, new_lsr);
 389
 390         if (new_lsr & SERIAL_LSR_BI) {
 391                 //
 392                 // Parity and Framing errors only count if they
 393                 // occur exclusive of a break being
 394                 // received.
 395                 //
 396                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 397         }
 398
 399         /* update input line counters */
 400         icount = &port->icount;
 401         if (new_lsr & SERIAL_LSR_BI) {
 402                 icount->brk++;
 403         }
 404         if (new_lsr & SERIAL_LSR_OE) {
 405                 icount->overrun++;
 406         }
 407         if (new_lsr & SERIAL_LSR_PE) {
 408                 icount->parity++;
 409         }
 410         if (new_lsr & SERIAL_LSR_FE) {
 411                 icount->frame++;
 412         }
 413
 414         return 0;
 415 }
 416
 417 /************************************************************************/
 418 /************************************************************************/
 419 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 420 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 421 /************************************************************************/
 422 /************************************************************************/
 423
 424 static void mos7840_control_callback(struct urb *urb, struct pt_regs *regs)
 425 {
 426         unsigned char *data;
 427         struct moschip_port *mos7840_port;
 428         __u8 regval = 0x0;
 429
 430         if (!urb) {
 431                 dbg("%s", "Invalid Pointer !!!!:\n");
 432                 return;
 433         }
 434
 435         switch (urb->status) {
 436         case 0:
 437                 /* success */
 438                 break;
 439         case -ECONNRESET:
 440         case -ENOENT:
 441         case -ESHUTDOWN:
 442                 /* this urb is terminated, clean up */
 443                 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 444                     urb->status);
 445                 return;
 446         default:
 447                 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 448                     urb->status);
 449                 goto exit;
 450         }
 451
 452         mos7840_port = (struct moschip_port *)urb->context;
 453
 454         dbg("%s urb buffer size is %d\n", __FUNCTION__, urb->actual_length);
 455         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __FUNCTION__,
 456             mos7840_port->MsrLsr, mos7840_port->port_num);
 457         data = urb->transfer_buffer;
 458         regval = (__u8) data[0];
 459         dbg("%s data is %x\n", __FUNCTION__, regval);
 460         if (mos7840_port->MsrLsr == 0)
 461                 mos7840_handle_new_msr(mos7840_port, regval);
 462         else if (mos7840_port->MsrLsr == 1)
 463                 mos7840_handle_new_lsr(mos7840_port, regval);
 464
 465       exit:
 466         return;
 467 }
 468
 469 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 470                            __u16 * val)
 471 {
 472         struct usb_device *dev = mcs->port->serial->dev;
 473         struct usb_ctrlrequest *dr = NULL;
 474         unsigned char *buffer = NULL;
 475         int ret = 0;
 476         buffer = (__u8 *) mcs->ctrl_buf;
 477
 478 //      dr=(struct usb_ctrlrequest *)(buffer);
 479         dr = (void *)(buffer + 2);
 480         dr->bRequestType = MCS_RD_RTYPE;
 481         dr->bRequest = MCS_RDREQ;
 482         dr->wValue = cpu_to_le16(Wval); //0;
 483         dr->wIndex = cpu_to_le16(reg);
 484         dr->wLength = cpu_to_le16(2);
 485
 486         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 487                              (unsigned char *)dr, buffer, 2,
 488                              mos7840_control_callback, mcs);
 489         mcs->control_urb->transfer_buffer_length = 2;
 490         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 491         return ret;
 492 }
 493
 494 /*****************************************************************************
 495  * mos7840_interrupt_callback
 496  *      this is the callback function for when we have received data on the
 497  *      interrupt endpoint.
 498  *****************************************************************************/
 499
 500 static void mos7840_interrupt_callback(struct urb *urb, struct pt_regs *regs)
 501 {
 502         int result;
 503         int length;
 504         struct moschip_port *mos7840_port;
 505         struct usb_serial *serial;
 506         __u16 Data;
 507         unsigned char *data;
 508         __u8 sp[5], st;
 509         int i;
 510         __u16 wval;
 511
 512         dbg("%s", " : Entering\n");
 513         if (!urb) {
 514                 dbg("%s", "Invalid Pointer !!!!:\n");
 515                 return;
 516         }
 517
 518         switch (urb->status) {
 519         case 0:
 520                 /* success */
 521                 break;
 522         case -ECONNRESET:
 523         case -ENOENT:
 524         case -ESHUTDOWN:
 525                 /* this urb is terminated, clean up */
 526                 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 527                     urb->status);
 528                 return;
 529         default:
 530                 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 531                     urb->status);
 532                 goto exit;
 533         }
 534
 535         length = urb->actual_length;
 536         data = urb->transfer_buffer;
 537
 538         serial = (struct usb_serial *)urb->context;
 539
 540         /* Moschip get 5 bytes
 541          * Byte 1 IIR Port 1 (port.number is 0)
 542          * Byte 2 IIR Port 2 (port.number is 1)
 543          * Byte 3 IIR Port 3 (port.number is 2)
 544          * Byte 4 IIR Port 4 (port.number is 3)
 545          * Byte 5 FIFO status for both */
 546
 547         if (length && length > 5) {
 548                 dbg("%s \n", "Wrong data !!!");
 549                 return;
 550         }
 551
 552         sp[0] = (__u8) data[0];
 553         sp[1] = (__u8) data[1];
 554         sp[2] = (__u8) data[2];
 555         sp[3] = (__u8) data[3];
 556         st = (__u8) data[4];
 557
 558         for (i = 0; i < serial->num_ports; i++) {
 559                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 560                 wval =
 561                     (((__u16) serial->port[i]->number -
 562                       (__u16) (serial->minor)) + 1) << 8;
 563                 if (mos7840_port->open) {
 564                         if (sp[i] & 0x01) {
 565                                 dbg("SP%d No Interrupt !!!\n", i);
 566                         } else {
 567                                 switch (sp[i] & 0x0f) {
 568                                 case SERIAL_IIR_RLS:
 569                                         dbg("Serial Port %d: Receiver status error or ", i);
 570                                         dbg("address bit detected in 9-bit mode\n");
 571                                         mos7840_port->MsrLsr = 1;
 572                                         mos7840_get_reg(mos7840_port, wval,
 573                                                         LINE_STATUS_REGISTER,
 574                                                         &Data);
 575                                         break;
 576                                 case SERIAL_IIR_MS:
 577                                         dbg("Serial Port %d: Modem status change\n", i);
 578                                         mos7840_port->MsrLsr = 0;
 579                                         mos7840_get_reg(mos7840_port, wval,
 580                                                         MODEM_STATUS_REGISTER,
 581                                                         &Data);
 582                                         break;
 583                                 }
 584                         }
 585                 }
 586         }
 587       exit:
 588         result = usb_submit_urb(urb, GFP_ATOMIC);
 589         if (result) {
 590                 dev_err(&urb->dev->dev,
 591                         "%s - Error %d submitting interrupt urb\n",
 592                         __FUNCTION__, result);
 593         }
 594
 595         return;
 596
 597 }
 598
 599 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 600                                        const char *function)
 601 {
 602         if (!port) {
 603                 dbg("%s - port == NULL", function);
 604                 return -1;
 605         }
 606         if (!port->serial) {
 607                 dbg("%s - port->serial == NULL", function);
 608                 return -1;
 609         }
 610
 611         return 0;
 612 }
 613
 614 /* Inline functions to check the sanity of a pointer that is passed to us */
 615 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 616                                          const char *function)
 617 {
 618         if (!serial) {
 619                 dbg("%s - serial == NULL", function);
 620                 return -1;
 621         }
 622         if (!serial->type) {
 623                 dbg("%s - serial->type == NULL!", function);
 624                 return -1;
 625         }
 626
 627         return 0;
 628 }
 629
 630 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 631                                                  const char *function)
 632 {
 633         /* if no port was specified, or it fails a paranoia check */
 634         if (!port ||
 635             mos7840_port_paranoia_check(port, function) ||
 636             mos7840_serial_paranoia_check(port->serial, function)) {
 637                 /* then say that we don't have a valid usb_serial thing, which will                  * end up genrating -ENODEV return values */
 638                 return NULL;
 639         }
 640
 641         return port->serial;
 642 }
 643
 644 /*****************************************************************************
 645  * mos7840_bulk_in_callback
 646  *      this is the callback function for when we have received data on the
 647  *      bulk in endpoint.
 648  *****************************************************************************/
 649
 650 static void mos7840_bulk_in_callback(struct urb *urb, struct pt_regs *regs)
 651 {
 652         int status;
 653         unsigned char *data;
 654         struct usb_serial *serial;
 655         struct usb_serial_port *port;
 656         struct moschip_port *mos7840_port;
 657         struct tty_struct *tty;
 658
 659         if (!urb) {
 660                 dbg("%s", "Invalid Pointer !!!!:\n");
 661                 return;
 662         }
 663
 664         if (urb->status) {
 665                 dbg("nonzero read bulk status received: %d", urb->status);
 666                 return;
 667         }
 668
 669         mos7840_port = (struct moschip_port *)urb->context;
 670         if (!mos7840_port) {
 671                 dbg("%s", "NULL mos7840_port pointer \n");
 672                 return;
 673         }
 674
 675         port = (struct usb_serial_port *)mos7840_port->port;
 676         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
 677                 dbg("%s", "Port Paranoia failed \n");
 678                 return;
 679         }
 680
 681         serial = mos7840_get_usb_serial(port, __FUNCTION__);
 682         if (!serial) {
 683                 dbg("%s\n", "Bad serial pointer ");
 684                 return;
 685         }
 686
 687         dbg("%s\n", "Entering... \n");
 688
 689         data = urb->transfer_buffer;
 690
 691         dbg("%s", "Entering ........... \n");
 692
 693         if (urb->actual_length) {
 694                 tty = mos7840_port->port->tty;
 695                 if (tty) {
 696                         tty_buffer_request_room(tty, urb->actual_length);
 697                         tty_insert_flip_string(tty, data, urb->actual_length);
 698                         dbg(" %s \n", data);
 699                         tty_flip_buffer_push(tty);
 700                 }
 701                 mos7840_port->icount.rx += urb->actual_length;
 702                 dbg("mos7840_port->icount.rx is %d:\n",
 703                     mos7840_port->icount.rx);
 704         }
 705
 706         if (!mos7840_port->read_urb) {
 707                 dbg("%s", "URB KILLED !!!\n");
 708                 return;
 709         }
 710
 711         if (mos7840_port->read_urb->status != -EINPROGRESS) {
 712                 mos7840_port->read_urb->dev = serial->dev;
 713
 714                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 715
 716                 if (status) {
 717                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
 718                             status);
 719                 }
 720         }
 721 }
 722
 723 /*****************************************************************************
 724  * mos7840_bulk_out_data_callback
 725  *      this is the callback function for when we have finished sending serial data
 726  *      on the bulk out endpoint.
 727  *****************************************************************************/
 728
 729 static void mos7840_bulk_out_data_callback(struct urb *urb,
 730                                            struct pt_regs *regs)
 731 {
 732         struct moschip_port *mos7840_port;
 733         struct tty_struct *tty;
 734         if (!urb) {
 735                 dbg("%s", "Invalid Pointer !!!!:\n");
 736                 return;
 737         }
 738
 739         if (urb->status) {
 740                 dbg("nonzero write bulk status received:%d\n", urb->status);
 741                 return;
 742         }
 743
 744         mos7840_port = (struct moschip_port *)urb->context;
 745         if (!mos7840_port) {
 746                 dbg("%s", "NULL mos7840_port pointer \n");
 747                 return;
 748         }
 749
 750         if (mos7840_port_paranoia_check(mos7840_port->port, __FUNCTION__)) {
 751                 dbg("%s", "Port Paranoia failed \n");
 752                 return;
 753         }
 754
 755         dbg("%s \n", "Entering .........");
 756
 757         tty = mos7840_port->port->tty;
 758
 759         if (tty && mos7840_port->open) {
 760                 /* let the tty driver wakeup if it has a special *
 761                  * write_wakeup function                         */
 762
 763                 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP))
 764                     && tty->ldisc.write_wakeup) {
 765                         (tty->ldisc.write_wakeup) (tty);
 766                 }
 767
 768                 /* tell the tty driver that something has changed */
 769                 wake_up_interruptible(&tty->write_wait);
 770         }
 771
 772 }
 773
 774 /************************************************************************/
 775 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 776 /************************************************************************/
 777 #ifdef MCSSerialProbe
 778 static int mos7840_serial_probe(struct usb_serial *serial,
 779                                 const struct usb_device_id *id)
 780 {
 781
 782         /*need to implement the mode_reg reading and updating\
 783            structures usb_serial_ device_type\
 784            (i.e num_ports, num_bulkin,bulkout etc) */
 785         /* Also we can update the changes  attach */
 786         return 1;
 787 }
 788 #endif
 789
 790 /*****************************************************************************
 791  * mos7840_open
 792  *      this function is called by the tty driver when a port is opened
 793  *      If successful, we return 0
 794  *      Otherwise we return a negative error number.
 795  *****************************************************************************/
 796
 797 static int mos7840_open(struct usb_serial_port *port, struct file *filp)
 798 {
 799         int response;
 800         int j;
 801         struct usb_serial *serial;
 802         struct urb *urb;
 803         __u16 Data;
 804         int status;
 805         struct moschip_port *mos7840_port;
 806
 807         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
 808                 dbg("%s", "Port Paranoia failed \n");
 809                 return -ENODEV;
 810         }
 811
 812         mos7840_num_open_ports++;
 813         serial = port->serial;
 814
 815         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
 816                 dbg("%s", "Serial Paranoia failed \n");
 817                 return -ENODEV;
 818         }
 819
 820         mos7840_port = mos7840_get_port_private(port);
 821
 822         if (mos7840_port == NULL)
 823                 return -ENODEV;
 824
 825         usb_clear_halt(serial->dev, port->write_urb->pipe);
 826         usb_clear_halt(serial->dev, port->read_urb->pipe);
 827
 828         /* Initialising the write urb pool */
 829         for (j = 0; j < NUM_URBS; ++j) {
 830                 urb = usb_alloc_urb(0, SLAB_ATOMIC);
 831                 mos7840_port->write_urb_pool[j] = urb;
 832
 833                 if (urb == NULL) {
 834                         err("No more urbs???");
 835                         continue;
 836                 }
 837
 838                 urb->transfer_buffer = NULL;
 839                 urb->transfer_buffer =
 840                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
 841                 if (!urb->transfer_buffer) {
 842                         err("%s-out of memory for urb buffers.", __FUNCTION__);
 843                         continue;
 844                 }
 845         }
 846
 847 /*****************************************************************************
 848  * Initialize MCS7840 -- Write Init values to corresponding Registers
 849  *
 850  * Register Index
 851  * 1 : IER
 852  * 2 : FCR
 853  * 3 : LCR
 854  * 4 : MCR
 855  *
 856  * 0x08 : SP1/2 Control Reg
 857  *****************************************************************************/
 858
 859 //NEED to check the following Block
 860
 861         status = 0;
 862         Data = 0x0;
 863         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 864         if (status < 0) {
 865                 dbg("Reading Spreg failed\n");
 866                 return -1;
 867         }
 868         Data |= 0x80;
 869         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 870         if (status < 0) {
 871                 dbg("writing Spreg failed\n");
 872                 return -1;
 873         }
 874
 875         Data &= ~0x80;
 876         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 877         if (status < 0) {
 878                 dbg("writing Spreg failed\n");
 879                 return -1;
 880         }
 881 //End of block to be checked
 882
 883         status = 0;
 884         Data = 0x0;
 885         status =
 886             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 887         if (status < 0) {
 888                 dbg("Reading Controlreg failed\n");
 889                 return -1;
 890         }
 891         Data |= 0x08;           //Driver done bit
 892         Data |= 0x20;           //rx_disable
 893         status = 0;
 894         status =
 895             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 896         if (status < 0) {
 897                 dbg("writing Controlreg failed\n");
 898                 return -1;
 899         }
 900         //do register settings here
 901         // Set all regs to the device default values.
 902         ////////////////////////////////////
 903         // First Disable all interrupts.
 904         ////////////////////////////////////
 905
 906         Data = 0x00;
 907         status = 0;
 908         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 909         if (status < 0) {
 910                 dbg("disableing interrupts failed\n");
 911                 return -1;
 912         }
 913         // Set FIFO_CONTROL_REGISTER to the default value
 914         Data = 0x00;
 915         status = 0;
 916         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 917         if (status < 0) {
 918                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 919                 return -1;
 920         }
 921
 922         Data = 0xcf;
 923         status = 0;
 924         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 925         if (status < 0) {
 926                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 927                 return -1;
 928         }
 929
 930         Data = 0x03;
 931         status = 0;
 932         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 933         mos7840_port->shadowLCR = Data;
 934
 935         Data = 0x0b;
 936         status = 0;
 937         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 938         mos7840_port->shadowMCR = Data;
 939
 940         Data = 0x00;
 941         status = 0;
 942         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 943         mos7840_port->shadowLCR = Data;
 944
 945         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
 946         status = 0;
 947         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 948
 949         Data = 0x0c;
 950         status = 0;
 951         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 952
 953         Data = 0x0;
 954         status = 0;
 955         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 956
 957         Data = 0x00;
 958         status = 0;
 959         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 960
 961         Data = Data & ~SERIAL_LCR_DLAB;
 962         status = 0;
 963         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 964         mos7840_port->shadowLCR = Data;
 965
 966         //clearing Bulkin and Bulkout Fifo
 967         Data = 0x0;
 968         status = 0;
 969         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 970
 971         Data = Data | 0x0c;
 972         status = 0;
 973         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 974
 975         Data = Data & ~0x0c;
 976         status = 0;
 977         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 978         //Finally enable all interrupts
 979         Data = 0x0;
 980         Data = 0x0c;
 981         status = 0;
 982         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 983
 984         //clearing rx_disable
 985         Data = 0x0;
 986         status = 0;
 987         status =
 988             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 989         Data = Data & ~0x20;
 990         status = 0;
 991         status =
 992             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 993
 994         // rx_negate
 995         Data = 0x0;
 996         status = 0;
 997         status =
 998             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 999         Data = Data | 0x10;
1000         status = 0;
1001         status =
1002             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
1003
1004         /* force low_latency on so that our tty_push actually forces *
1005          * the data through,otherwise it is scheduled, and with      *
1006          * high data rates (like with OHCI) data can get lost.       */
1007
1008         if (port->tty)
1009                 port->tty->low_latency = 1;
1010 /* Check to see if we've set up our endpoint info yet    *
1011      * (can't set it up in mos7840_startup as the structures *
1012      * were not set up at that time.)                        */
1013         if (mos7840_num_open_ports == 1) {
1014                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1015
1016                         /* set up interrupt urb */
1017
1018                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1019                                          serial->dev,
1020                                          usb_rcvintpipe(serial->dev,
1021                                                         serial->port[0]->
1022                                                         interrupt_in_endpointAddress),
1023                                          serial->port[0]->interrupt_in_buffer,
1024                                          serial->port[0]->interrupt_in_urb->
1025                                          transfer_buffer_length,
1026                                          mos7840_interrupt_callback,
1027                                          serial,
1028                                          serial->port[0]->interrupt_in_urb->
1029                                          interval);
1030
1031                         /* start interrupt read for mos7840               *
1032                          * will continue as long as mos7840 is connected  */
1033
1034                         response =
1035                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1036                                            GFP_KERNEL);
1037                         if (response) {
1038                                 err("%s - Error %d submitting interrupt urb",
1039                                     __FUNCTION__, response);
1040                         }
1041
1042                 }
1043
1044         }
1045
1046         /* see if we've set up our endpoint info yet   *
1047          * (can't set it up in mos7840_startup as the  *
1048          * structures were not set up at that time.)   */
1049
1050         dbg("port number is %d \n", port->number);
1051         dbg("serial number is %d \n", port->serial->minor);
1052         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1053         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1054         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1055         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1056         mos7840_port->read_urb = port->read_urb;
1057
1058         /* set up our bulk in urb */
1059
1060         usb_fill_bulk_urb(mos7840_port->read_urb,
1061                           serial->dev,
1062                           usb_rcvbulkpipe(serial->dev,
1063                                           port->bulk_in_endpointAddress),
1064                           port->bulk_in_buffer,
1065                           mos7840_port->read_urb->transfer_buffer_length,
1066                           mos7840_bulk_in_callback, mos7840_port);
1067
1068         dbg("mos7840_open: bulkin endpoint is %d\n",
1069             port->bulk_in_endpointAddress);
1070         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1071         if (response) {
1072                 err("%s - Error %d submitting control urb", __FUNCTION__,
1073                     response);
1074         }
1075
1076         /* initialize our wait queues */
1077         init_waitqueue_head(&mos7840_port->wait_chase);
1078         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1079
1080         /* initialize our icount structure */
1081         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1082
1083         /* initialize our port settings */
1084         mos7840_port->shadowMCR = MCR_MASTER_IE;        /* Must set to enable ints! */
1085         /* send a open port command */
1086         mos7840_port->open = 1;
1087         //mos7840_change_port_settings(mos7840_port,old_termios);
1088         mos7840_port->icount.tx = 0;
1089         mos7840_port->icount.rx = 0;
1090
1091         dbg("\n\nusb_serial serial:%x       mos7840_port:%x\n      usb_serial_port port:%x\n\n", (unsigned int)serial, (unsigned int)mos7840_port, (unsigned int)port);
1092
1093         return 0;
1094
1095 }
1096
1097 /*****************************************************************************
1098  * mos7840_chars_in_buffer
1099  *      this function is called by the tty driver when it wants to know how many
1100  *      bytes of data we currently have outstanding in the port (data that has
1101  *      been written, but hasn't made it out the port yet)
1102  *      If successful, we return the number of bytes left to be written in the
1103  *      system,
1104  *      Otherwise we return a negative error number.
1105  *****************************************************************************/
1106
1107 static int mos7840_chars_in_buffer(struct usb_serial_port *port)
1108 {
1109         int i;
1110         int chars = 0;
1111         struct moschip_port *mos7840_port;
1112
1113         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1114
1115         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1116                 dbg("%s", "Invalid port \n");
1117                 return -1;
1118         }
1119
1120         mos7840_port = mos7840_get_port_private(port);
1121         if (mos7840_port == NULL) {
1122                 dbg("%s \n", "mos7840_break:leaving ...........");
1123                 return -1;
1124         }
1125
1126         for (i = 0; i < NUM_URBS; ++i) {
1127                 if (mos7840_port->write_urb_pool[i]->status == -EINPROGRESS) {
1128                         chars += URB_TRANSFER_BUFFER_SIZE;
1129                 }
1130         }
1131         dbg("%s - returns %d", __FUNCTION__, chars);
1132         return (chars);
1133
1134 }
1135
1136 /************************************************************************
1137  *
1138  * mos7840_block_until_tx_empty
1139  *
1140  *      This function will block the close until one of the following:
1141  *              1. TX count are 0
1142  *              2. The mos7840 has stopped
1143  *              3. A timout of 3 seconds without activity has expired
1144  *
1145  ************************************************************************/
1146 static void mos7840_block_until_tx_empty(struct moschip_port *mos7840_port)
1147 {
1148         int timeout = HZ / 10;
1149         int wait = 30;
1150         int count;
1151
1152         while (1) {
1153
1154                 count = mos7840_chars_in_buffer(mos7840_port->port);
1155
1156                 /* Check for Buffer status */
1157                 if (count <= 0) {
1158                         return;
1159                 }
1160
1161                 /* Block the thread for a while */
1162                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1163                                                timeout);
1164
1165                 /* No activity.. count down section */
1166                 wait--;
1167                 if (wait == 0) {
1168                         dbg("%s - TIMEOUT", __FUNCTION__);
1169                         return;
1170                 } else {
1171                         /* Reset timout value back to seconds */
1172                         wait = 30;
1173                 }
1174         }
1175 }
1176
1177 /*****************************************************************************
1178  * mos7840_close
1179  *      this function is called by the tty driver when a port is closed
1180  *****************************************************************************/
1181
1182 static void mos7840_close(struct usb_serial_port *port, struct file *filp)
1183 {
1184         struct usb_serial *serial;
1185         struct moschip_port *mos7840_port;
1186         int j;
1187         __u16 Data;
1188
1189         dbg("%s\n", "mos7840_close:entering...");
1190
1191         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1192                 dbg("%s", "Port Paranoia failed \n");
1193                 return;
1194         }
1195
1196         serial = mos7840_get_usb_serial(port, __FUNCTION__);
1197         if (!serial) {
1198                 dbg("%s", "Serial Paranoia failed \n");
1199                 return;
1200         }
1201
1202         mos7840_port = mos7840_get_port_private(port);
1203
1204         if (mos7840_port == NULL) {
1205                 return;
1206         }
1207
1208         for (j = 0; j < NUM_URBS; ++j)
1209                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1210
1211         /* Freeing Write URBs */
1212         for (j = 0; j < NUM_URBS; ++j) {
1213                 if (mos7840_port->write_urb_pool[j]) {
1214                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1215                                 kfree(mos7840_port->write_urb_pool[j]->
1216                                       transfer_buffer);
1217
1218                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1219                 }
1220         }
1221
1222         if (serial->dev) {
1223                 /* flush and block until tx is empty */
1224                 mos7840_block_until_tx_empty(mos7840_port);
1225         }
1226
1227         /* While closing port, shutdown all bulk read, write  *
1228          * and interrupt read if they exists                  */
1229         if (serial->dev) {
1230
1231                 if (mos7840_port->write_urb) {
1232                         dbg("%s", "Shutdown bulk write\n");
1233                         usb_kill_urb(mos7840_port->write_urb);
1234                 }
1235
1236                 if (mos7840_port->read_urb) {
1237                         dbg("%s", "Shutdown bulk read\n");
1238                         usb_kill_urb(mos7840_port->read_urb);
1239                 }
1240                 if ((&mos7840_port->control_urb)) {
1241                         dbg("%s", "Shutdown control read\n");
1242                         //      usb_kill_urb (mos7840_port->control_urb);
1243
1244                 }
1245         }
1246 //              if(mos7840_port->ctrl_buf != NULL)
1247 //                      kfree(mos7840_port->ctrl_buf);
1248         mos7840_num_open_ports--;
1249         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1250             mos7840_num_open_ports, port->number);
1251         if (mos7840_num_open_ports == 0) {
1252                 if (serial->port[0]->interrupt_in_urb) {
1253                         dbg("%s", "Shutdown interrupt_in_urb\n");
1254                 }
1255         }
1256
1257         if (mos7840_port->write_urb) {
1258                 /* if this urb had a transfer buffer already (old tx) free it */
1259
1260                 if (mos7840_port->write_urb->transfer_buffer != NULL) {
1261                         kfree(mos7840_port->write_urb->transfer_buffer);
1262                 }
1263                 usb_free_urb(mos7840_port->write_urb);
1264         }
1265
1266         Data = 0x0;
1267         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1268
1269         Data = 0x00;
1270         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1271
1272         mos7840_port->open = 0;
1273
1274         dbg("%s \n", "Leaving ............");
1275 }
1276
1277 /************************************************************************
1278  *
1279  * mos7840_block_until_chase_response
1280  *
1281  *      This function will block the close until one of the following:
1282  *              1. Response to our Chase comes from mos7840
1283  *              2. A timout of 10 seconds without activity has expired
1284  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1285  *
1286  ************************************************************************/
1287
1288 static void mos7840_block_until_chase_response(struct moschip_port
1289                                                *mos7840_port)
1290 {
1291         int timeout = 1 * HZ;
1292         int wait = 10;
1293         int count;
1294
1295         while (1) {
1296                 count = mos7840_chars_in_buffer(mos7840_port->port);
1297
1298                 /* Check for Buffer status */
1299                 if (count <= 0) {
1300                         return;
1301                 }
1302
1303                 /* Block the thread for a while */
1304                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1305                                                timeout);
1306                 /* No activity.. count down section */
1307                 wait--;
1308                 if (wait == 0) {
1309                         dbg("%s - TIMEOUT", __FUNCTION__);
1310                         return;
1311                 } else {
1312                         /* Reset timout value back to seconds */
1313                         wait = 10;
1314                 }
1315         }
1316
1317 }
1318
1319 /*****************************************************************************
1320  * mos7840_break
1321  *      this function sends a break to the port
1322  *****************************************************************************/
1323 static void mos7840_break(struct usb_serial_port *port, int break_state)
1324 {
1325         unsigned char data;
1326         struct usb_serial *serial;
1327         struct moschip_port *mos7840_port;
1328
1329         dbg("%s \n", "Entering ...........");
1330         dbg("mos7840_break: Start\n");
1331
1332         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1333                 dbg("%s", "Port Paranoia failed \n");
1334                 return;
1335         }
1336
1337         serial = mos7840_get_usb_serial(port, __FUNCTION__);
1338         if (!serial) {
1339                 dbg("%s", "Serial Paranoia failed \n");
1340                 return;
1341         }
1342
1343         mos7840_port = mos7840_get_port_private(port);
1344
1345         if (mos7840_port == NULL) {
1346                 return;
1347         }
1348
1349         if (serial->dev) {
1350
1351                 /* flush and block until tx is empty */
1352                 mos7840_block_until_chase_response(mos7840_port);
1353         }
1354
1355         if (break_state == -1) {
1356                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1357         } else {
1358                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1359         }
1360
1361         mos7840_port->shadowLCR = data;
1362         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1363             mos7840_port->shadowLCR);
1364         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1365                              mos7840_port->shadowLCR);
1366
1367         return;
1368 }
1369
1370 /*****************************************************************************
1371  * mos7840_write_room
1372  *      this function is called by the tty driver when it wants to know how many
1373  *      bytes of data we can accept for a specific port.
1374  *      If successful, we return the amount of room that we have for this port
1375  *      Otherwise we return a negative error number.
1376  *****************************************************************************/
1377
1378 static int mos7840_write_room(struct usb_serial_port *port)
1379 {
1380         int i;
1381         int room = 0;
1382         struct moschip_port *mos7840_port;
1383
1384         dbg("%s \n", " mos7840_write_room:entering ...........");
1385
1386         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1387                 dbg("%s", "Invalid port \n");
1388                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1389                 return -1;
1390         }
1391
1392         mos7840_port = mos7840_get_port_private(port);
1393         if (mos7840_port == NULL) {
1394                 dbg("%s \n", "mos7840_break:leaving ...........");
1395                 return -1;
1396         }
1397
1398         for (i = 0; i < NUM_URBS; ++i) {
1399                 if (mos7840_port->write_urb_pool[i]->status != -EINPROGRESS) {
1400                         room += URB_TRANSFER_BUFFER_SIZE;
1401                 }
1402         }
1403
1404         dbg("%s - returns %d", __FUNCTION__, room);
1405         return (room);
1406
1407 }
1408
1409 /*****************************************************************************
1410  * mos7840_write
1411  *      this function is called by the tty driver when data should be written to
1412  *      the port.
1413  *      If successful, we return the number of bytes written, otherwise we
1414  *      return a negative error number.
1415  *****************************************************************************/
1416
1417 static int mos7840_write(struct usb_serial_port *port,
1418                          const unsigned char *data, int count)
1419 {
1420         int status;
1421         int i;
1422         int bytes_sent = 0;
1423         int transfer_size;
1424         int from_user = 0;
1425
1426         struct moschip_port *mos7840_port;
1427         struct usb_serial *serial;
1428         struct urb *urb;
1429         //__u16 Data;
1430         const unsigned char *current_position = data;
1431         unsigned char *data1;
1432         dbg("%s \n", "entering ...........");
1433         //dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",mos7840_port->shadowLCR);
1434
1435 #ifdef NOTMOS7840
1436         Data = 0x00;
1437         status = 0;
1438         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1439         mos7840_port->shadowLCR = Data;
1440         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1441         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1442             mos7840_port->shadowLCR);
1443
1444         //Data = 0x03;
1445         //status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data);
1446         //mos7840_port->shadowLCR=Data;//Need to add later
1447
1448         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
1449         status = 0;
1450         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1451
1452         //Data = 0x0c;
1453         //status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data);
1454         Data = 0x00;
1455         status = 0;
1456         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1457         dbg("mos7840_write:DLL value is %x\n", Data);
1458
1459         Data = 0x0;
1460         status = 0;
1461         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1462         dbg("mos7840_write:DLM value is %x\n", Data);
1463
1464         Data = Data & ~SERIAL_LCR_DLAB;
1465         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1466             mos7840_port->shadowLCR);
1467         status = 0;
1468         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1469 #endif
1470
1471         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1472                 dbg("%s", "Port Paranoia failed \n");
1473                 return -1;
1474         }
1475
1476         serial = port->serial;
1477         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
1478                 dbg("%s", "Serial Paranoia failed \n");
1479                 return -1;
1480         }
1481
1482         mos7840_port = mos7840_get_port_private(port);
1483         if (mos7840_port == NULL) {
1484                 dbg("%s", "mos7840_port is NULL\n");
1485                 return -1;
1486         }
1487
1488         /* try to find a free urb in the list */
1489         urb = NULL;
1490
1491         for (i = 0; i < NUM_URBS; ++i) {
1492                 if (mos7840_port->write_urb_pool[i]->status != -EINPROGRESS) {
1493                         urb = mos7840_port->write_urb_pool[i];
1494                         dbg("\nURB:%d", i);
1495                         break;
1496                 }
1497         }
1498
1499         if (urb == NULL) {
1500                 dbg("%s - no more free urbs", __FUNCTION__);
1501                 goto exit;
1502         }
1503
1504         if (urb->transfer_buffer == NULL) {
1505                 urb->transfer_buffer =
1506                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1507
1508                 if (urb->transfer_buffer == NULL) {
1509                         err("%s no more kernel memory...", __FUNCTION__);
1510                         goto exit;
1511                 }
1512         }
1513         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1514
1515         if (from_user) {
1516                 if (copy_from_user
1517                     (urb->transfer_buffer, current_position, transfer_size)) {
1518                         bytes_sent = -EFAULT;
1519                         goto exit;
1520                 }
1521         } else {
1522                 memcpy(urb->transfer_buffer, current_position, transfer_size);
1523         }
1524
1525         /* fill urb with data and submit  */
1526         usb_fill_bulk_urb(urb,
1527                           serial->dev,
1528                           usb_sndbulkpipe(serial->dev,
1529                                           port->bulk_out_endpointAddress),
1530                           urb->transfer_buffer,
1531                           transfer_size,
1532                           mos7840_bulk_out_data_callback, mos7840_port);
1533
1534         data1 = urb->transfer_buffer;
1535         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1536
1537         /* send it down the pipe */
1538         status = usb_submit_urb(urb, GFP_ATOMIC);
1539
1540         if (status) {
1541                 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1542                     __FUNCTION__, status);
1543                 bytes_sent = status;
1544                 goto exit;
1545         }
1546         bytes_sent = transfer_size;
1547         mos7840_port->icount.tx += transfer_size;
1548         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1549       exit:
1550
1551         return bytes_sent;
1552
1553 }
1554
1555 /*****************************************************************************
1556  * mos7840_throttle
1557  *      this function is called by the tty driver when it wants to stop the data
1558  *      being read from the port.
1559  *****************************************************************************/
1560
1561 static void mos7840_throttle(struct usb_serial_port *port)
1562 {
1563         struct moschip_port *mos7840_port;
1564         struct tty_struct *tty;
1565         int status;
1566
1567         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1568                 dbg("%s", "Invalid port \n");
1569                 return;
1570         }
1571
1572         dbg("- port %d\n", port->number);
1573
1574         mos7840_port = mos7840_get_port_private(port);
1575
1576         if (mos7840_port == NULL)
1577                 return;
1578
1579         if (!mos7840_port->open) {
1580                 dbg("%s\n", "port not opened");
1581                 return;
1582         }
1583
1584         dbg("%s", "Entering .......... \n");
1585
1586         tty = port->tty;
1587         if (!tty) {
1588                 dbg("%s - no tty available", __FUNCTION__);
1589                 return;
1590         }
1591
1592         /* if we are implementing XON/XOFF, send the stop character */
1593         if (I_IXOFF(tty)) {
1594                 unsigned char stop_char = STOP_CHAR(tty);
1595                 status = mos7840_write(port, &stop_char, 1);
1596                 if (status <= 0) {
1597                         return;
1598                 }
1599         }
1600
1601         /* if we are implementing RTS/CTS, toggle that line */
1602         if (tty->termios->c_cflag & CRTSCTS) {
1603                 mos7840_port->shadowMCR &= ~MCR_RTS;
1604                 status = 0;
1605                 status =
1606                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1607                                          mos7840_port->shadowMCR);
1608
1609                 if (status < 0) {
1610                         return;
1611                 }
1612         }
1613
1614         return;
1615 }
1616
1617 /*****************************************************************************
1618  * mos7840_unthrottle
1619  *      this function is called by the tty driver when it wants to resume the data
1620  *      being read from the port (called after SerialThrottle is called)
1621  *****************************************************************************/
1622 static void mos7840_unthrottle(struct usb_serial_port *port)
1623 {
1624         struct tty_struct *tty;
1625         int status;
1626         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1627
1628         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1629                 dbg("%s", "Invalid port \n");
1630                 return;
1631         }
1632
1633         if (mos7840_port == NULL)
1634                 return;
1635
1636         if (!mos7840_port->open) {
1637                 dbg("%s - port not opened", __FUNCTION__);
1638                 return;
1639         }
1640
1641         dbg("%s", "Entering .......... \n");
1642
1643         tty = port->tty;
1644         if (!tty) {
1645                 dbg("%s - no tty available", __FUNCTION__);
1646                 return;
1647         }
1648
1649         /* if we are implementing XON/XOFF, send the start character */
1650         if (I_IXOFF(tty)) {
1651                 unsigned char start_char = START_CHAR(tty);
1652                 status = mos7840_write(port, &start_char, 1);
1653                 if (status <= 0) {
1654                         return;
1655                 }
1656         }
1657
1658         /* if we are implementing RTS/CTS, toggle that line */
1659         if (tty->termios->c_cflag & CRTSCTS) {
1660                 mos7840_port->shadowMCR |= MCR_RTS;
1661                 status = 0;
1662                 status =
1663                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1664                                          mos7840_port->shadowMCR);
1665                 if (status < 0) {
1666                         return;
1667                 }
1668         }
1669
1670         return;
1671 }
1672
1673 static int mos7840_tiocmget(struct usb_serial_port *port, struct file *file)
1674 {
1675         struct moschip_port *mos7840_port;
1676         unsigned int result;
1677         __u16 msr;
1678         __u16 mcr;
1679         int status = 0;
1680         mos7840_port = mos7840_get_port_private(port);
1681
1682         dbg("%s - port %d", __FUNCTION__, port->number);
1683
1684         if (mos7840_port == NULL)
1685                 return -ENODEV;
1686
1687         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1688         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1689         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1690             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1691             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1692             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1693             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1694             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1695             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1696
1697         dbg("%s - 0x%04X", __FUNCTION__, result);
1698
1699         return result;
1700 }
1701
1702 static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
1703                             unsigned int set, unsigned int clear)
1704 {
1705         struct moschip_port *mos7840_port;
1706         unsigned int mcr;
1707         unsigned int status;
1708
1709         dbg("%s - port %d", __FUNCTION__, port->number);
1710
1711         mos7840_port = mos7840_get_port_private(port);
1712
1713         if (mos7840_port == NULL)
1714                 return -ENODEV;
1715
1716         mcr = mos7840_port->shadowMCR;
1717         if (clear & TIOCM_RTS)
1718                 mcr &= ~MCR_RTS;
1719         if (clear & TIOCM_DTR)
1720                 mcr &= ~MCR_DTR;
1721         if (clear & TIOCM_LOOP)
1722                 mcr &= ~MCR_LOOPBACK;
1723
1724         if (set & TIOCM_RTS)
1725                 mcr |= MCR_RTS;
1726         if (set & TIOCM_DTR)
1727                 mcr |= MCR_DTR;
1728         if (set & TIOCM_LOOP)
1729                 mcr |= MCR_LOOPBACK;
1730
1731         mos7840_port->shadowMCR = mcr;
1732
1733         status = 0;
1734         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1735         if (status < 0) {
1736                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1737                 return -1;
1738         }
1739
1740         return 0;
1741 }
1742
1743 /*****************************************************************************
1744  * mos7840_calc_baud_rate_divisor
1745  *      this function calculates the proper baud rate divisor for the specified
1746  *      baud rate.
1747  *****************************************************************************/
1748 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1749                                           __u16 * clk_sel_val)
1750 {
1751
1752         dbg("%s - %d", __FUNCTION__, baudRate);
1753
1754         if (baudRate <= 115200) {
1755                 *divisor = 115200 / baudRate;
1756                 *clk_sel_val = 0x0;
1757         }
1758         if ((baudRate > 115200) && (baudRate <= 230400)) {
1759                 *divisor = 230400 / baudRate;
1760                 *clk_sel_val = 0x10;
1761         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1762                 *divisor = 403200 / baudRate;
1763                 *clk_sel_val = 0x20;
1764         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1765                 *divisor = 460800 / baudRate;
1766                 *clk_sel_val = 0x30;
1767         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1768                 *divisor = 806400 / baudRate;
1769                 *clk_sel_val = 0x40;
1770         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1771                 *divisor = 921600 / baudRate;
1772                 *clk_sel_val = 0x50;
1773         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1774                 *divisor = 1572864 / baudRate;
1775                 *clk_sel_val = 0x60;
1776         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1777                 *divisor = 3145728 / baudRate;
1778                 *clk_sel_val = 0x70;
1779         }
1780         return 0;
1781
1782 #ifdef NOTMCS7840
1783
1784         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1785                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1786                         *divisor = mos7840_divisor_table[i].Divisor;
1787                         return 0;
1788                 }
1789         }
1790
1791         /* After trying for all the standard baud rates    *
1792          * Try calculating the divisor for this baud rate  */
1793
1794         if (baudrate > 75 && baudrate < 230400) {
1795                 /* get the divisor */
1796                 custom = (__u16) (230400L / baudrate);
1797
1798                 /* Check for round off */
1799                 round1 = (__u16) (2304000L / baudrate);
1800                 round = (__u16) (round1 - (custom * 10));
1801                 if (round > 4) {
1802                         custom++;
1803                 }
1804                 *divisor = custom;
1805
1806                 dbg(" Baud %d = %d\n", baudrate, custom);
1807                 return 0;
1808         }
1809
1810         dbg("%s\n", " Baud calculation Failed...");
1811         return -1;
1812 #endif
1813 }
1814
1815 /*****************************************************************************
1816  * mos7840_send_cmd_write_baud_rate
1817  *      this function sends the proper command to change the baud rate of the
1818  *      specified port.
1819  *****************************************************************************/
1820
1821 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1822                                             int baudRate)
1823 {
1824         int divisor = 0;
1825         int status;
1826         __u16 Data;
1827         unsigned char number;
1828         __u16 clk_sel_val;
1829         struct usb_serial_port *port;
1830
1831         if (mos7840_port == NULL)
1832                 return -1;
1833
1834         port = (struct usb_serial_port *)mos7840_port->port;
1835         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1836                 dbg("%s", "Invalid port \n");
1837                 return -1;
1838         }
1839
1840         if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1841                 dbg("%s", "Invalid Serial \n");
1842                 return -1;
1843         }
1844
1845         dbg("%s", "Entering .......... \n");
1846
1847         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1848
1849         dbg("%s - port = %d, baud = %d", __FUNCTION__,
1850             mos7840_port->port->number, baudRate);
1851         //reset clk_uart_sel in spregOffset
1852         if (baudRate > 115200) {
1853 #ifdef HW_flow_control
1854                 //NOTE: need to see the pther register to modify
1855                 //setting h/w flow control bit to 1;
1856                 status = 0;
1857                 Data = 0x2b;
1858                 mos7840_port->shadowMCR = Data;
1859                 status =
1860                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1861                 if (status < 0) {
1862                         dbg("Writing spreg failed in set_serial_baud\n");
1863                         return -1;
1864                 }
1865 #endif
1866
1867         } else {
1868 #ifdef HW_flow_control
1869                 //setting h/w flow control bit to 0;
1870                 status = 0;
1871                 Data = 0xb;
1872                 mos7840_port->shadowMCR = Data;
1873                 status =
1874                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1875                 if (status < 0) {
1876                         dbg("Writing spreg failed in set_serial_baud\n");
1877                         return -1;
1878                 }
1879 #endif
1880
1881         }
1882
1883         if (1)                  //baudRate <= 115200)
1884         {
1885                 clk_sel_val = 0x0;
1886                 Data = 0x0;
1887                 status = 0;
1888                 status =
1889                     mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1890                                                    &clk_sel_val);
1891                 status =
1892                     mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1893                                          &Data);
1894                 if (status < 0) {
1895                         dbg("reading spreg failed in set_serial_baud\n");
1896                         return -1;
1897                 }
1898                 Data = (Data & 0x8f) | clk_sel_val;
1899                 status = 0;
1900                 status =
1901                     mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1902                 if (status < 0) {
1903                         dbg("Writing spreg failed in set_serial_baud\n");
1904                         return -1;
1905                 }
1906                 /* Calculate the Divisor */
1907
1908                 if (status) {
1909                         err("%s - bad baud rate", __FUNCTION__);
1910                         dbg("%s\n", "bad baud rate");
1911                         return status;
1912                 }
1913                 /* Enable access to divisor latch */
1914                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1915                 mos7840_port->shadowLCR = Data;
1916                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1917
1918                 /* Write the divisor */
1919                 Data = (unsigned char)(divisor & 0xff);
1920                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1921                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1922
1923                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1924                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1925                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1926
1927                 /* Disable access to divisor latch */
1928                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1929                 mos7840_port->shadowLCR = Data;
1930                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1931
1932         }
1933
1934         return status;
1935 }
1936
1937 /*****************************************************************************
1938  * mos7840_change_port_settings
1939  *      This routine is called to set the UART on the device to match
1940  *      the specified new settings.
1941  *****************************************************************************/
1942
1943 static void mos7840_change_port_settings(struct moschip_port *mos7840_port,
1944                                          struct termios *old_termios)
1945 {
1946         struct tty_struct *tty;
1947         int baud;
1948         unsigned cflag;
1949         unsigned iflag;
1950         __u8 lData;
1951         __u8 lParity;
1952         __u8 lStop;
1953         int status;
1954         __u16 Data;
1955         struct usb_serial_port *port;
1956         struct usb_serial *serial;
1957
1958         if (mos7840_port == NULL)
1959                 return;
1960
1961         port = (struct usb_serial_port *)mos7840_port->port;
1962
1963         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1964                 dbg("%s", "Invalid port \n");
1965                 return;
1966         }
1967
1968         if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1969                 dbg("%s", "Invalid Serial \n");
1970                 return;
1971         }
1972
1973         serial = port->serial;
1974
1975         dbg("%s - port %d", __FUNCTION__, mos7840_port->port->number);
1976
1977         if (!mos7840_port->open) {
1978                 dbg("%s - port not opened", __FUNCTION__);
1979                 return;
1980         }
1981
1982         tty = mos7840_port->port->tty;
1983
1984         if ((!tty) || (!tty->termios)) {
1985                 dbg("%s - no tty structures", __FUNCTION__);
1986                 return;
1987         }
1988
1989         dbg("%s", "Entering .......... \n");
1990
1991         lData = LCR_BITS_8;
1992         lStop = LCR_STOP_1;
1993         lParity = LCR_PAR_NONE;
1994
1995         cflag = tty->termios->c_cflag;
1996         iflag = tty->termios->c_iflag;
1997
1998         /* Change the number of bits */
1999         if (cflag & CSIZE) {
2000                 switch (cflag & CSIZE) {
2001                 case CS5:
2002                         lData = LCR_BITS_5;
2003                         break;
2004
2005                 case CS6:
2006                         lData = LCR_BITS_6;
2007                         break;
2008
2009                 case CS7:
2010                         lData = LCR_BITS_7;
2011                         break;
2012                 default:
2013                 case CS8:
2014                         lData = LCR_BITS_8;
2015                         break;
2016                 }
2017         }
2018         /* Change the Parity bit */
2019         if (cflag & PARENB) {
2020                 if (cflag & PARODD) {
2021                         lParity = LCR_PAR_ODD;
2022                         dbg("%s - parity = odd", __FUNCTION__);
2023                 } else {
2024                         lParity = LCR_PAR_EVEN;
2025                         dbg("%s - parity = even", __FUNCTION__);
2026                 }
2027
2028         } else {
2029                 dbg("%s - parity = none", __FUNCTION__);
2030         }
2031
2032         if (cflag & CMSPAR) {
2033                 lParity = lParity | 0x20;
2034         }
2035
2036         /* Change the Stop bit */
2037         if (cflag & CSTOPB) {
2038                 lStop = LCR_STOP_2;
2039                 dbg("%s - stop bits = 2", __FUNCTION__);
2040         } else {
2041                 lStop = LCR_STOP_1;
2042                 dbg("%s - stop bits = 1", __FUNCTION__);
2043         }
2044
2045         /* Update the LCR with the correct value */
2046         mos7840_port->shadowLCR &=
2047             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2048         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2049
2050         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2051             mos7840_port->shadowLCR);
2052         /* Disable Interrupts */
2053         Data = 0x00;
2054         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2055
2056         Data = 0x00;
2057         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2058
2059         Data = 0xcf;
2060         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2061
2062         /* Send the updated LCR value to the mos7840 */
2063         Data = mos7840_port->shadowLCR;
2064
2065         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2066
2067         Data = 0x00b;
2068         mos7840_port->shadowMCR = Data;
2069         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2070         Data = 0x00b;
2071         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2072
2073         /* set up the MCR register and send it to the mos7840 */
2074
2075         mos7840_port->shadowMCR = MCR_MASTER_IE;
2076         if (cflag & CBAUD) {
2077                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2078         }
2079
2080         if (cflag & CRTSCTS) {
2081                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2082
2083         } else {
2084                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2085         }
2086
2087         Data = mos7840_port->shadowMCR;
2088         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2089
2090         /* Determine divisor based on baud rate */
2091         baud = tty_get_baud_rate(tty);
2092
2093         if (!baud) {
2094                 /* pick a default, any default... */
2095                 dbg("%s\n", "Picked default baud...");
2096                 baud = 9600;
2097         }
2098
2099         dbg("%s - baud rate = %d", __FUNCTION__, baud);
2100         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2101
2102         /* Enable Interrupts */
2103         Data = 0x0c;
2104         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2105
2106         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2107                 mos7840_port->read_urb->dev = serial->dev;
2108
2109                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2110
2111                 if (status) {
2112                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2113                             status);
2114                 }
2115         }
2116         wake_up(&mos7840_port->delta_msr_wait);
2117         mos7840_port->delta_msr_cond = 1;
2118         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2119             mos7840_port->shadowLCR);
2120
2121         return;
2122 }
2123
2124 /*****************************************************************************
2125  * mos7840_set_termios
2126  *      this function is called by the tty driver when it wants to change
2127  *      the termios structure
2128  *****************************************************************************/
2129
2130 static void mos7840_set_termios(struct usb_serial_port *port,
2131                                 struct termios *old_termios)
2132 {
2133         int status;
2134         unsigned int cflag;
2135         struct usb_serial *serial;
2136         struct moschip_port *mos7840_port;
2137         struct tty_struct *tty;
2138         dbg("mos7840_set_termios: START\n");
2139         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2140                 dbg("%s", "Invalid port \n");
2141                 return;
2142         }
2143
2144         serial = port->serial;
2145
2146         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
2147                 dbg("%s", "Invalid Serial \n");
2148                 return;
2149         }
2150
2151         mos7840_port = mos7840_get_port_private(port);
2152
2153         if (mos7840_port == NULL)
2154                 return;
2155
2156         tty = port->tty;
2157
2158         if (!port->tty || !port->tty->termios) {
2159                 dbg("%s - no tty or termios", __FUNCTION__);
2160                 return;
2161         }
2162
2163         if (!mos7840_port->open) {
2164                 dbg("%s - port not opened", __FUNCTION__);
2165                 return;
2166         }
2167
2168         dbg("%s\n", "setting termios - ");
2169
2170         cflag = tty->termios->c_cflag;
2171
2172         if (!cflag) {
2173                 dbg("%s %s\n", __FUNCTION__, "cflag is NULL");
2174                 return;
2175         }
2176
2177         /* check that they really want us to change something */
2178         if (old_termios) {
2179                 if ((cflag == old_termios->c_cflag) &&
2180                     (RELEVANT_IFLAG(tty->termios->c_iflag) ==
2181                      RELEVANT_IFLAG(old_termios->c_iflag))) {
2182                         dbg("%s\n", "Nothing to change");
2183                         return;
2184                 }
2185         }
2186
2187         dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
2188             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2189
2190         if (old_termios) {
2191                 dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
2192                     old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2193         }
2194
2195         dbg("%s - port %d", __FUNCTION__, port->number);
2196
2197         /* change the port settings to the new ones specified */
2198
2199         mos7840_change_port_settings(mos7840_port, old_termios);
2200
2201         if (!mos7840_port->read_urb) {
2202                 dbg("%s", "URB KILLED !!!!!\n");
2203                 return;
2204         }
2205
2206         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2207                 mos7840_port->read_urb->dev = serial->dev;
2208                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2209                 if (status) {
2210                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2211                             status);
2212                 }
2213         }
2214         return;
2215 }
2216
2217 /*****************************************************************************
2218  * mos7840_get_lsr_info - get line status register info
2219  *
2220  * Purpose: Let user call ioctl() to get info when the UART physically
2221  *          is emptied.  On bus types like RS485, the transmitter must
2222  *          release the bus after transmitting. This must be done when
2223  *          the transmit shift register is empty, not be done when the
2224  *          transmit holding register is empty.  This functionality
2225  *          allows an RS485 driver to be written in user space.
2226  *****************************************************************************/
2227
2228 static int mos7840_get_lsr_info(struct moschip_port *mos7840_port,
2229                                 unsigned int *value)
2230 {
2231         int count;
2232         unsigned int result = 0;
2233
2234         count = mos7840_chars_in_buffer(mos7840_port->port);
2235         if (count == 0) {
2236                 dbg("%s -- Empty", __FUNCTION__);
2237                 result = TIOCSER_TEMT;
2238         }
2239
2240         if (copy_to_user(value, &result, sizeof(int)))
2241                 return -EFAULT;
2242         return 0;
2243 }
2244
2245 /*****************************************************************************
2246  * mos7840_get_bytes_avail - get number of bytes available
2247  *
2248  * Purpose: Let user call ioctl to get the count of number of bytes available.
2249  *****************************************************************************/
2250
2251 static int mos7840_get_bytes_avail(struct moschip_port *mos7840_port,
2252                                    unsigned int *value)
2253 {
2254         unsigned int result = 0;
2255         struct tty_struct *tty = mos7840_port->port->tty;
2256
2257         if (!tty)
2258                 return -ENOIOCTLCMD;
2259
2260         result = tty->read_cnt;
2261
2262         dbg("%s(%d) = %d", __FUNCTION__, mos7840_port->port->number, result);
2263         if (copy_to_user(value, &result, sizeof(int)))
2264                 return -EFAULT;
2265
2266         return -ENOIOCTLCMD;
2267 }
2268
2269 /*****************************************************************************
2270  * mos7840_set_modem_info
2271  *      function to set modem info
2272  *****************************************************************************/
2273
2274 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2275                                   unsigned int cmd, unsigned int *value)
2276 {
2277         unsigned int mcr;
2278         unsigned int arg;
2279         __u16 Data;
2280         int status;
2281         struct usb_serial_port *port;
2282
2283         if (mos7840_port == NULL)
2284                 return -1;
2285
2286         port = (struct usb_serial_port *)mos7840_port->port;
2287         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2288                 dbg("%s", "Invalid port \n");
2289                 return -1;
2290         }
2291
2292         mcr = mos7840_port->shadowMCR;
2293
2294         if (copy_from_user(&arg, value, sizeof(int)))
2295                 return -EFAULT;
2296
2297         switch (cmd) {
2298         case TIOCMBIS:
2299                 if (arg & TIOCM_RTS)
2300                         mcr |= MCR_RTS;
2301                 if (arg & TIOCM_DTR)
2302                         mcr |= MCR_RTS;
2303                 if (arg & TIOCM_LOOP)
2304                         mcr |= MCR_LOOPBACK;
2305                 break;
2306
2307         case TIOCMBIC:
2308                 if (arg & TIOCM_RTS)
2309                         mcr &= ~MCR_RTS;
2310                 if (arg & TIOCM_DTR)
2311                         mcr &= ~MCR_RTS;
2312                 if (arg & TIOCM_LOOP)
2313                         mcr &= ~MCR_LOOPBACK;
2314                 break;
2315
2316         case TIOCMSET:
2317                 /* turn off the RTS and DTR and LOOPBACK
2318                  * and then only turn on what was asked to */
2319                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2320                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2321                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2322                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2323                 break;
2324         }
2325
2326         mos7840_port->shadowMCR = mcr;
2327
2328         Data = mos7840_port->shadowMCR;
2329         status = 0;
2330         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2331         if (status < 0) {
2332                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2333                 return -1;
2334         }
2335
2336         return 0;
2337 }
2338
2339 /*****************************************************************************
2340  * mos7840_get_modem_info
2341  *      function to get modem info
2342  *****************************************************************************/
2343
2344 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2345                                   unsigned int *value)
2346 {
2347         unsigned int result = 0;
2348         __u16 msr;
2349         unsigned int mcr = mos7840_port->shadowMCR;
2350         int status = 0;
2351         status =
2352             mos7840_get_uart_reg(mos7840_port->port, MODEM_STATUS_REGISTER,
2353                                  &msr);
2354         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2355             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2356             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2357             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2358             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2359             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2360
2361         dbg("%s -- %x", __FUNCTION__, result);
2362
2363         if (copy_to_user(value, &result, sizeof(int)))
2364                 return -EFAULT;
2365         return 0;
2366 }
2367
2368 /*****************************************************************************
2369  * mos7840_get_serial_info
2370  *      function to get information about serial port
2371  *****************************************************************************/
2372
2373 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2374                                    struct serial_struct *retinfo)
2375 {
2376         struct serial_struct tmp;
2377
2378         if (mos7840_port == NULL)
2379                 return -1;
2380
2381         if (!retinfo)
2382                 return -EFAULT;
2383
2384         memset(&tmp, 0, sizeof(tmp));
2385
2386         tmp.type = PORT_16550A;
2387         tmp.line = mos7840_port->port->serial->minor;
2388         tmp.port = mos7840_port->port->number;
2389         tmp.irq = 0;
2390         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2391         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2392         tmp.baud_base = 9600;
2393         tmp.close_delay = 5 * HZ;
2394         tmp.closing_wait = 30 * HZ;
2395
2396         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2397                 return -EFAULT;
2398         return 0;
2399 }
2400
2401 /*****************************************************************************
2402  * SerialIoctl
2403  *      this function handles any ioctl calls to the driver
2404  *****************************************************************************/
2405
2406 static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
2407                          unsigned int cmd, unsigned long arg)
2408 {
2409         struct moschip_port *mos7840_port;
2410         struct tty_struct *tty;
2411
2412         struct async_icount cnow;
2413         struct async_icount cprev;
2414         struct serial_icounter_struct icount;
2415         int mosret = 0;
2416         int retval;
2417         struct tty_ldisc *ld;
2418
2419         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2420                 dbg("%s", "Invalid port \n");
2421                 return -1;
2422         }
2423
2424         mos7840_port = mos7840_get_port_private(port);
2425         tty = mos7840_port->port->tty;
2426
2427         if (mos7840_port == NULL)
2428                 return -1;
2429
2430         dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
2431
2432         switch (cmd) {
2433                 /* return number of bytes available */
2434
2435         case TIOCINQ:
2436                 dbg("%s (%d) TIOCINQ", __FUNCTION__, port->number);
2437                 return mos7840_get_bytes_avail(mos7840_port,
2438                                                (unsigned int *)arg);
2439                 break;
2440
2441         case TIOCOUTQ:
2442                 dbg("%s (%d) TIOCOUTQ", __FUNCTION__, port->number);
2443                 return put_user(tty->driver->chars_in_buffer ?
2444                                 tty->driver->chars_in_buffer(tty) : 0,
2445                                 (int __user *)arg);
2446                 break;
2447
2448         case TCFLSH:
2449                 retval = tty_check_change(tty);
2450                 if (retval)
2451                         return retval;
2452
2453                 ld = tty_ldisc_ref(tty);
2454                 switch (arg) {
2455                 case TCIFLUSH:
2456                         if (ld && ld->flush_buffer)
2457                                 ld->flush_buffer(tty);
2458                         break;
2459                 case TCIOFLUSH:
2460                         if (ld && ld->flush_buffer)
2461                                 ld->flush_buffer(tty);
2462                         /* fall through */
2463                 case TCOFLUSH:
2464                         if (tty->driver->flush_buffer)
2465                                 tty->driver->flush_buffer(tty);
2466                         break;
2467                 default:
2468                         tty_ldisc_deref(ld);
2469                         return -EINVAL;
2470                 }
2471                 tty_ldisc_deref(ld);
2472                 return 0;
2473
2474         case TCGETS:
2475                 if (kernel_termios_to_user_termios
2476                     ((struct termios __user *)arg, tty->termios))
2477                         return -EFAULT;
2478                 return 0;
2479
2480         case TIOCSERGETLSR:
2481                 dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__, port->number);
2482                 return mos7840_get_lsr_info(mos7840_port, (unsigned int *)arg);
2483                 return 0;
2484
2485         case TIOCMBIS:
2486         case TIOCMBIC:
2487         case TIOCMSET:
2488                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
2489                     port->number);
2490                 mosret =
2491                     mos7840_set_modem_info(mos7840_port, cmd,
2492                                            (unsigned int *)arg);
2493                 return mosret;
2494
2495         case TIOCMGET:
2496                 dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
2497                 return mos7840_get_modem_info(mos7840_port,
2498                                               (unsigned int *)arg);
2499
2500         case TIOCGSERIAL:
2501                 dbg("%s (%d) TIOCGSERIAL", __FUNCTION__, port->number);
2502                 return mos7840_get_serial_info(mos7840_port,
2503                                                (struct serial_struct *)arg);
2504
2505         case TIOCSSERIAL:
2506                 dbg("%s (%d) TIOCSSERIAL", __FUNCTION__, port->number);
2507                 break;
2508
2509         case TIOCMIWAIT:
2510                 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
2511                 cprev = mos7840_port->icount;
2512                 while (1) {
2513                         //interruptible_sleep_on(&mos7840_port->delta_msr_wait);
2514                         mos7840_port->delta_msr_cond = 0;
2515                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2516                                                  (mos7840_port->
2517                                                   delta_msr_cond == 1));
2518
2519                         /* see if a signal did it */
2520                         if (signal_pending(current))
2521                                 return -ERESTARTSYS;
2522                         cnow = mos7840_port->icount;
2523                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2524                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2525                                 return -EIO;    /* no change => error */
2526                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2527                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2528                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2529                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2530                                 return 0;
2531                         }
2532                         cprev = cnow;
2533                 }
2534                 /* NOTREACHED */
2535                 break;
2536
2537         case TIOCGICOUNT:
2538                 cnow = mos7840_port->icount;
2539                 icount.cts = cnow.cts;
2540                 icount.dsr = cnow.dsr;
2541                 icount.rng = cnow.rng;
2542                 icount.dcd = cnow.dcd;
2543                 icount.rx = cnow.rx;
2544                 icount.tx = cnow.tx;
2545                 icount.frame = cnow.frame;
2546                 icount.overrun = cnow.overrun;
2547                 icount.parity = cnow.parity;
2548                 icount.brk = cnow.brk;
2549                 icount.buf_overrun = cnow.buf_overrun;
2550
2551                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
2552                     port->number, icount.rx, icount.tx);
2553                 if (copy_to_user((void *)arg, &icount, sizeof(icount)))
2554                         return -EFAULT;
2555                 return 0;
2556
2557         case TIOCEXBAUD:
2558                 return 0;
2559         default:
2560                 break;
2561         }
2562
2563         return -ENOIOCTLCMD;
2564 }
2565
2566 static int mos7840_calc_num_ports(struct usb_serial *serial)
2567 {
2568
2569         dbg("numberofendpoints: %d \n",
2570             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2571         dbg("numberofendpoints: %d \n",
2572             (int)serial->interface->altsetting->desc.bNumEndpoints);
2573         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2574                 mos7840_num_ports = 2;
2575                 serial->type->num_ports = 2;
2576         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2577                 mos7840_num_ports = 4;
2578                 serial->type->num_bulk_in = 4;
2579                 serial->type->num_bulk_out = 4;
2580                 serial->type->num_ports = 4;
2581         }
2582
2583         return mos7840_num_ports;
2584 }
2585
2586 /****************************************************************************
2587  * mos7840_startup
2588  ****************************************************************************/
2589
2590 static int mos7840_startup(struct usb_serial *serial)
2591 {
2592         struct moschip_port *mos7840_port;
2593         struct usb_device *dev;
2594         int i, status;
2595
2596         __u16 Data;
2597         dbg("%s \n", " mos7840_startup :entering..........");
2598
2599         if (!serial) {
2600                 dbg("%s\n", "Invalid Handler");
2601                 return -1;
2602         }
2603
2604         dev = serial->dev;
2605
2606         dbg("%s\n", "Entering...");
2607
2608         /* we set up the pointers to the endpoints in the mos7840_open *
2609          * function, as the structures aren't created yet.             */
2610
2611         /* set up port private structures */
2612         for (i = 0; i < serial->num_ports; ++i) {
2613                 mos7840_port = kmalloc(sizeof(struct moschip_port), GFP_KERNEL);
2614                 if (mos7840_port == NULL) {
2615                         err("%s - Out of memory", __FUNCTION__);
2616                         return -ENOMEM;
2617                 }
2618                 memset(mos7840_port, 0, sizeof(struct moschip_port));
2619
2620                 /* Initialize all port interrupt end point to port 0 int endpoint *
2621                  * Our device has only one interrupt end point comman to all port */
2622
2623                 mos7840_port->port = serial->port[i];
2624                 mos7840_set_port_private(serial->port[i], mos7840_port);
2625
2626                 mos7840_port->port_num = ((serial->port[i]->number -
2627                                            (serial->port[i]->serial->minor)) +
2628                                           1);
2629
2630                 if (mos7840_port->port_num == 1) {
2631                         mos7840_port->SpRegOffset = 0x0;
2632                         mos7840_port->ControlRegOffset = 0x1;
2633                         mos7840_port->DcrRegOffset = 0x4;
2634                 } else if ((mos7840_port->port_num == 2)
2635                            && (mos7840_num_ports == 4)) {
2636                         mos7840_port->SpRegOffset = 0x8;
2637                         mos7840_port->ControlRegOffset = 0x9;
2638                         mos7840_port->DcrRegOffset = 0x16;
2639                 } else if ((mos7840_port->port_num == 2)
2640                            && (mos7840_num_ports == 2)) {
2641                         mos7840_port->SpRegOffset = 0xa;
2642                         mos7840_port->ControlRegOffset = 0xb;
2643                         mos7840_port->DcrRegOffset = 0x19;
2644                 } else if ((mos7840_port->port_num == 3)
2645                            && (mos7840_num_ports == 4)) {
2646                         mos7840_port->SpRegOffset = 0xa;
2647                         mos7840_port->ControlRegOffset = 0xb;
2648                         mos7840_port->DcrRegOffset = 0x19;
2649                 } else if ((mos7840_port->port_num == 4)
2650                            && (mos7840_num_ports == 4)) {
2651                         mos7840_port->SpRegOffset = 0xc;
2652                         mos7840_port->ControlRegOffset = 0xd;
2653                         mos7840_port->DcrRegOffset = 0x1c;
2654                 }
2655                 mos7840_dump_serial_port(mos7840_port);
2656
2657                 mos7840_set_port_private(serial->port[i], mos7840_port);
2658
2659                 //enable rx_disable bit in control register
2660
2661                 status =
2662                     mos7840_get_reg_sync(serial->port[i],
2663                                          mos7840_port->ControlRegOffset, &Data);
2664                 if (status < 0) {
2665                         dbg("Reading ControlReg failed status-0x%x\n", status);
2666                         break;
2667                 } else
2668                         dbg("ControlReg Reading success val is %x, status%d\n",
2669                             Data, status);
2670                 Data |= 0x08;   //setting driver done bit
2671                 Data |= 0x04;   //sp1_bit to have cts change reflect in modem status reg
2672
2673                 //Data |= 0x20; //rx_disable bit
2674                 status = 0;
2675                 status =
2676                     mos7840_set_reg_sync(serial->port[i],
2677                                          mos7840_port->ControlRegOffset, Data);
2678                 if (status < 0) {
2679                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2680                         break;
2681                 } else
2682                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2683                             status);
2684
2685                 //Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
2686                 Data = 0x01;
2687                 status = 0;
2688                 status =
2689                     mos7840_set_reg_sync(serial->port[i],
2690                                          (__u16) (mos7840_port->DcrRegOffset +
2691                                                   0), Data);
2692                 if (status < 0) {
2693                         dbg("Writing DCR0 failed status-0x%x\n", status);
2694                         break;
2695                 } else
2696                         dbg("DCR0 Writing success status%d\n", status);
2697
2698                 Data = 0x05;
2699                 status = 0;
2700                 status =
2701                     mos7840_set_reg_sync(serial->port[i],
2702                                          (__u16) (mos7840_port->DcrRegOffset +
2703                                                   1), Data);
2704                 if (status < 0) {
2705                         dbg("Writing DCR1 failed status-0x%x\n", status);
2706                         break;
2707                 } else
2708                         dbg("DCR1 Writing success status%d\n", status);
2709
2710                 Data = 0x24;
2711                 status = 0;
2712                 status =
2713                     mos7840_set_reg_sync(serial->port[i],
2714                                          (__u16) (mos7840_port->DcrRegOffset +
2715                                                   2), Data);
2716                 if (status < 0) {
2717                         dbg("Writing DCR2 failed status-0x%x\n", status);
2718                         break;
2719                 } else
2720                         dbg("DCR2 Writing success status%d\n", status);
2721
2722                 // write values in clkstart0x0 and clkmulti 0x20
2723                 Data = 0x0;
2724                 status = 0;
2725                 status =
2726                     mos7840_set_reg_sync(serial->port[i],
2727                                          CLK_START_VALUE_REGISTER, Data);
2728                 if (status < 0) {
2729                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2730                         break;
2731                 } else
2732                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2733
2734                 Data = 0x20;
2735                 status = 0;
2736                 status =
2737                     mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
2738                                          Data);
2739                 if (status < 0) {
2740                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2741                             status);
2742                         break;
2743                 } else
2744                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2745                             status);
2746
2747                 //write value 0x0 to scratchpad register
2748                 Data = 0x00;
2749                 status = 0;
2750                 status =
2751                     mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
2752                                          Data);
2753                 if (status < 0) {
2754                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2755                             status);
2756                         break;
2757                 } else
2758                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2759                             status);
2760
2761                 //Zero Length flag register
2762                 if ((mos7840_port->port_num != 1)
2763                     && (mos7840_num_ports == 2)) {
2764
2765                         Data = 0xff;
2766                         status = 0;
2767                         status = mos7840_set_reg_sync(serial->port[i],
2768                                                       (__u16) (ZLP_REG1 +
2769                                                                ((__u16)
2770                                                                 mos7840_port->
2771                                                                 port_num)),
2772                                                       Data);
2773                         dbg("ZLIP offset%x\n",
2774                             (__u16) (ZLP_REG1 +
2775                                      ((__u16) mos7840_port->port_num)));
2776                         if (status < 0) {
2777                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2778                                     i + 2, status);
2779                                 break;
2780                         } else
2781                                 dbg("ZLP_REG%d Writing success status%d\n",
2782                                     i + 2, status);
2783                 } else {
2784                         Data = 0xff;
2785                         status = 0;
2786                         status = mos7840_set_reg_sync(serial->port[i],
2787                                                       (__u16) (ZLP_REG1 +
2788                                                                ((__u16)
2789                                                                 mos7840_port->
2790                                                                 port_num) -
2791                                                                0x1), Data);
2792                         dbg("ZLIP offset%x\n",
2793                             (__u16) (ZLP_REG1 +
2794                                      ((__u16) mos7840_port->port_num) - 0x1));
2795                         if (status < 0) {
2796                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2797                                     i + 1, status);
2798                                 break;
2799                         } else
2800                                 dbg("ZLP_REG%d Writing success status%d\n",
2801                                     i + 1, status);
2802
2803                 }
2804                 mos7840_port->control_urb = usb_alloc_urb(0, SLAB_ATOMIC);
2805                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2806
2807         }
2808
2809         //Zero Length flag enable
2810         Data = 0x0f;
2811         status = 0;
2812         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2813         if (status < 0) {
2814                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2815                 return -1;
2816         } else
2817                 dbg("ZLP_REG5 Writing success status%d\n", status);
2818
2819         /* setting configuration feature to one */
2820         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2821                         (__u8) 0x03, 0x00, 0x01, 0x00, 0x00, 0x00, 5 * HZ);
2822         return 0;
2823 }
2824
2825 /****************************************************************************
2826  * mos7840_shutdown
2827  *      This function is called whenever the device is removed from the usb bus.
2828  ****************************************************************************/
2829
2830 static void mos7840_shutdown(struct usb_serial *serial)
2831 {
2832         int i;
2833         struct moschip_port *mos7840_port;
2834         dbg("%s \n", " shutdown :entering..........");
2835
2836         if (!serial) {
2837                 dbg("%s", "Invalid Handler \n");
2838                 return;
2839         }
2840
2841         /*      check for the ports to be closed,close the ports and disconnect         */
2842
2843         /* free private structure allocated for serial port  *
2844          * stop reads and writes on all ports                */
2845
2846         for (i = 0; i < serial->num_ports; ++i) {
2847                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2848                 kfree(mos7840_port->ctrl_buf);
2849                 usb_kill_urb(mos7840_port->control_urb);
2850                 kfree(mos7840_port);
2851                 mos7840_set_port_private(serial->port[i], NULL);
2852         }
2853
2854         dbg("%s\n", "Thank u :: ");
2855
2856 }
2857
2858 static struct usb_serial_driver moschip7840_4port_device = {
2859         .driver = {
2860                    .owner = THIS_MODULE,
2861                    .name = "mos7840",
2862                    },
2863         .description = DRIVER_DESC,
2864         .id_table = moschip_port_id_table,
2865         .num_interrupt_in = 1,  //NUM_DONT_CARE,//1,
2866 #ifdef check
2867         .num_bulk_in = 4,
2868         .num_bulk_out = 4,
2869         .num_ports = 4,
2870 #endif
2871         .open = mos7840_open,
2872         .close = mos7840_close,
2873         .write = mos7840_write,
2874         .write_room = mos7840_write_room,
2875         .chars_in_buffer = mos7840_chars_in_buffer,
2876         .throttle = mos7840_throttle,
2877         .unthrottle = mos7840_unthrottle,
2878         .calc_num_ports = mos7840_calc_num_ports,
2879 #ifdef MCSSerialProbe
2880         .probe = mos7840_serial_probe,
2881 #endif
2882         .ioctl = mos7840_ioctl,
2883         .set_termios = mos7840_set_termios,
2884         .break_ctl = mos7840_break,
2885         .tiocmget = mos7840_tiocmget,
2886         .tiocmset = mos7840_tiocmset,
2887         .attach = mos7840_startup,
2888         .shutdown = mos7840_shutdown,
2889         .read_bulk_callback = mos7840_bulk_in_callback,
2890         .read_int_callback = mos7840_interrupt_callback,
2891 };
2892
2893 static struct usb_driver io_driver = {
2894         .name = "mos7840",
2895         .probe = usb_serial_probe,
2896         .disconnect = usb_serial_disconnect,
2897         .id_table = moschip_id_table_combined,
2898 };
2899
2900 /****************************************************************************
2901  * moschip7840_init
2902  *      This is called by the module subsystem, or on startup to initialize us
2903  ****************************************************************************/
2904 static int __init moschip7840_init(void)
2905 {
2906         int retval;
2907
2908         dbg("%s \n", " mos7840_init :entering..........");
2909
2910         /* Register with the usb serial */
2911         retval = usb_serial_register(&moschip7840_4port_device);
2912
2913         if (retval)
2914                 goto failed_port_device_register;
2915
2916         dbg("%s\n", "Entring...");
2917         info(DRIVER_DESC " " DRIVER_VERSION);
2918
2919         /* Register with the usb */
2920         retval = usb_register(&io_driver);
2921
2922         if (retval)
2923                 goto failed_usb_register;
2924
2925         if (retval == 0) {
2926                 dbg("%s\n", "Leaving...");
2927                 return 0;
2928         }
2929
2930       failed_usb_register:
2931         usb_serial_deregister(&moschip7840_4port_device);
2932
2933       failed_port_device_register:
2934
2935         return retval;
2936 }
2937
2938 /****************************************************************************
2939  * moschip7840_exit
2940  *      Called when the driver is about to be unloaded.
2941  ****************************************************************************/
2942 static void __exit moschip7840_exit(void)
2943 {
2944
2945         dbg("%s \n", " mos7840_exit :entering..........");
2946
2947         usb_deregister(&io_driver);
2948
2949         usb_serial_deregister(&moschip7840_4port_device);
2950
2951         dbg("%s\n", "Entring...");
2952 }
2953
2954 module_init(moschip7840_init);
2955 module_exit(moschip7840_exit);
2956
2957 /* Module information */
2958 MODULE_DESCRIPTION(DRIVER_DESC);
2959 MODULE_LICENSE("GPL");
2960
2961 module_param(debug, bool, S_IRUGO | S_IWUSR);
2962 MODULE_PARM_DESC(debug, "Debug enabled or not");