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 <linux/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 /* The native mos7840/7820 component */
 114 #define USB_VENDOR_ID_MOSCHIP           0x9710
 115 #define MOSCHIP_DEVICE_ID_7840          0x7840
 116 #define MOSCHIP_DEVICE_ID_7820          0x7820
 117 /* The native component can have its vendor/device id's overridden
 118  * in vendor-specific implementations.  Such devices can be handled
 119  * by making a change here, in moschip_port_id_table, and in
 120  * moschip_id_table_combined
 121  */
 122 #define USB_VENDOR_ID_BANDB             0x0856
 123 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 124 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 125
 126 /* Interrupt Routine Defines    */
 127
 128 #define SERIAL_IIR_RLS      0x06
 129 #define SERIAL_IIR_MS       0x00
 130
 131 /*
 132  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 133  */
 134 #define SERIAL_LSR_DR       0x0001
 135 #define SERIAL_LSR_OE       0x0002
 136 #define SERIAL_LSR_PE       0x0004
 137 #define SERIAL_LSR_FE       0x0008
 138 #define SERIAL_LSR_BI       0x0010
 139
 140 #define MOS_MSR_DELTA_CTS   0x10
 141 #define MOS_MSR_DELTA_DSR   0x20
 142 #define MOS_MSR_DELTA_RI    0x40
 143 #define MOS_MSR_DELTA_CD    0x80
 144
 145 /* Serial Port register Address */
 146 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 147 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 148 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 149 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 150 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 151 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 152 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 153 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 154 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 155
 156 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 157 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 158
 159 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 160
 161 /*
 162  * URB POOL related defines
 163  */
 164 #define NUM_URBS                        16      /* URB Count */
 165 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 166
 167
 168 static struct usb_device_id moschip_port_id_table[] = {
 169         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 170         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 171         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 172         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 173         {}                      /* terminating entry */
 174 };
 175
 176 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 177         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 178         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 179         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 180         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 181         {}                      /* terminating entry */
 182 };
 183
 184 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 185
 186 /* This structure holds all of the local port information */
 187
 188 struct moschip_port {
 189         int port_num;           /*Actual port number in the device(1,2,etc) */
 190         struct urb *write_urb;  /* write URB for this port */
 191         struct urb *read_urb;   /* read URB for this port */
 192         struct urb *int_urb;
 193         __u8 shadowLCR;         /* last LCR value received */
 194         __u8 shadowMCR;         /* last MCR value received */
 195         char open;
 196         char open_ports;
 197         char zombie;
 198         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 199         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 200         int delta_msr_cond;
 201         struct async_icount icount;
 202         struct usb_serial_port *port;   /* loop back to the owner of this object */
 203
 204         /* Offsets */
 205         __u8 SpRegOffset;
 206         __u8 ControlRegOffset;
 207         __u8 DcrRegOffset;
 208         /* for processing control URBS in interrupt context */
 209         struct urb *control_urb;
 210         struct usb_ctrlrequest *dr;
 211         char *ctrl_buf;
 212         int MsrLsr;
 213
 214         spinlock_t pool_lock;
 215         struct urb *write_urb_pool[NUM_URBS];
 216         char busy[NUM_URBS];
 217         bool read_urb_busy;
 218 };
 219
 220
 221 static int debug;
 222
 223 /*
 224  * mos7840_set_reg_sync
 225  *      To set the Control register by calling usb_fill_control_urb function
 226  *      by passing usb_sndctrlpipe function as parameter.
 227  */
 228
 229 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 230                                 __u16 val)
 231 {
 232         struct usb_device *dev = port->serial->dev;
 233         val = val & 0x00ff;
 234         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 235
 236         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 237                                MCS_WR_RTYPE, val, reg, NULL, 0,
 238                                MOS_WDR_TIMEOUT);
 239 }
 240
 241 /*
 242  * mos7840_get_reg_sync
 243  *      To set the Uart register by calling usb_fill_control_urb function by
 244  *      passing usb_rcvctrlpipe function as parameter.
 245  */
 246
 247 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 248                                 __u16 *val)
 249 {
 250         struct usb_device *dev = port->serial->dev;
 251         int ret = 0;
 252
 253         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 254                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 255                               MOS_WDR_TIMEOUT);
 256         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 257         *val = (*val) & 0x00ff;
 258         return ret;
 259 }
 260
 261 /*
 262  * mos7840_set_uart_reg
 263  *      To set the Uart register by calling usb_fill_control_urb function by
 264  *      passing usb_sndctrlpipe function as parameter.
 265  */
 266
 267 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 268                                 __u16 val)
 269 {
 270
 271         struct usb_device *dev = port->serial->dev;
 272         val = val & 0x00ff;
 273         /* For the UART control registers, the application number need
 274            to be Or'ed */
 275         if (port->serial->num_ports == 4) {
 276                 val |= (((__u16) port->number -
 277                                 (__u16) (port->serial->minor)) + 1) << 8;
 278                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 279         } else {
 280                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 281                         val |= (((__u16) port->number -
 282                               (__u16) (port->serial->minor)) + 1) << 8;
 283                         dbg("mos7840_set_uart_reg application number is %x\n",
 284                             val);
 285                 } else {
 286                         val |=
 287                             (((__u16) port->number -
 288                               (__u16) (port->serial->minor)) + 2) << 8;
 289                         dbg("mos7840_set_uart_reg application number is %x\n",
 290                             val);
 291                 }
 292         }
 293         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 294                                MCS_WR_RTYPE, val, reg, NULL, 0,
 295                                MOS_WDR_TIMEOUT);
 296
 297 }
 298
 299 /*
 300  * mos7840_get_uart_reg
 301  *      To set the Control register by calling usb_fill_control_urb function
 302  *      by passing usb_rcvctrlpipe function as parameter.
 303  */
 304 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 305                                 __u16 *val)
 306 {
 307         struct usb_device *dev = port->serial->dev;
 308         int ret = 0;
 309         __u16 Wval;
 310
 311         /* dbg("application number is %4x \n",
 312             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 313         /* Wval  is same as application number */
 314         if (port->serial->num_ports == 4) {
 315                 Wval =
 316                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 317                      1) << 8;
 318                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 319         } else {
 320                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 321                         Wval = (((__u16) port->number -
 322                               (__u16) (port->serial->minor)) + 1) << 8;
 323                         dbg("mos7840_get_uart_reg application number is %x\n",
 324                             Wval);
 325                 } else {
 326                         Wval = (((__u16) port->number -
 327                               (__u16) (port->serial->minor)) + 2) << 8;
 328                         dbg("mos7840_get_uart_reg application number is %x\n",
 329                             Wval);
 330                 }
 331         }
 332         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 333                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 334                               MOS_WDR_TIMEOUT);
 335         *val = (*val) & 0x00ff;
 336         return ret;
 337 }
 338
 339 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 340 {
 341
 342         dbg("***************************************\n");
 343         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 344         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 345         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 346         dbg("***************************************\n");
 347
 348 }
 349
 350 /************************************************************************/
 351 /************************************************************************/
 352 /*             I N T E R F A C E   F U N C T I O N S                    */
 353 /*             I N T E R F A C E   F U N C T I O N S                    */
 354 /************************************************************************/
 355 /************************************************************************/
 356
 357 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 358                                             struct moschip_port *data)
 359 {
 360         usb_set_serial_port_data(port, (void *)data);
 361 }
 362
 363 static inline struct moschip_port *mos7840_get_port_private(struct
 364                                                             usb_serial_port
 365                                                             *port)
 366 {
 367         return (struct moschip_port *)usb_get_serial_port_data(port);
 368 }
 369
 370 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 371 {
 372         struct moschip_port *mos7840_port;
 373         struct async_icount *icount;
 374         mos7840_port = port;
 375         icount = &mos7840_port->icount;
 376         if (new_msr &
 377             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 378              MOS_MSR_DELTA_CD)) {
 379                 icount = &mos7840_port->icount;
 380
 381                 /* update input line counters */
 382                 if (new_msr & MOS_MSR_DELTA_CTS) {
 383                         icount->cts++;
 384                         smp_wmb();
 385                 }
 386                 if (new_msr & MOS_MSR_DELTA_DSR) {
 387                         icount->dsr++;
 388                         smp_wmb();
 389                 }
 390                 if (new_msr & MOS_MSR_DELTA_CD) {
 391                         icount->dcd++;
 392                         smp_wmb();
 393                 }
 394                 if (new_msr & MOS_MSR_DELTA_RI) {
 395                         icount->rng++;
 396                         smp_wmb();
 397                 }
 398         }
 399 }
 400
 401 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 402 {
 403         struct async_icount *icount;
 404
 405         dbg("%s - %02x", __func__, new_lsr);
 406
 407         if (new_lsr & SERIAL_LSR_BI) {
 408                 /*
 409                  * Parity and Framing errors only count if they
 410                  * occur exclusive of a break being
 411                  * received.
 412                  */
 413                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 414         }
 415
 416         /* update input line counters */
 417         icount = &port->icount;
 418         if (new_lsr & SERIAL_LSR_BI) {
 419                 icount->brk++;
 420                 smp_wmb();
 421         }
 422         if (new_lsr & SERIAL_LSR_OE) {
 423                 icount->overrun++;
 424                 smp_wmb();
 425         }
 426         if (new_lsr & SERIAL_LSR_PE) {
 427                 icount->parity++;
 428                 smp_wmb();
 429         }
 430         if (new_lsr & SERIAL_LSR_FE) {
 431                 icount->frame++;
 432                 smp_wmb();
 433         }
 434 }
 435
 436 /************************************************************************/
 437 /************************************************************************/
 438 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 439 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 440 /************************************************************************/
 441 /************************************************************************/
 442
 443 static void mos7840_control_callback(struct urb *urb)
 444 {
 445         unsigned char *data;
 446         struct moschip_port *mos7840_port;
 447         __u8 regval = 0x0;
 448         int result = 0;
 449         int status = urb->status;
 450
 451         mos7840_port = urb->context;
 452
 453         switch (status) {
 454         case 0:
 455                 /* success */
 456                 break;
 457         case -ECONNRESET:
 458         case -ENOENT:
 459         case -ESHUTDOWN:
 460                 /* this urb is terminated, clean up */
 461                 dbg("%s - urb shutting down with status: %d", __func__,
 462                     status);
 463                 return;
 464         default:
 465                 dbg("%s - nonzero urb status received: %d", __func__,
 466                     status);
 467                 goto exit;
 468         }
 469
 470         dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
 471         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 472             mos7840_port->MsrLsr, mos7840_port->port_num);
 473         data = urb->transfer_buffer;
 474         regval = (__u8) data[0];
 475         dbg("%s data is %x\n", __func__, regval);
 476         if (mos7840_port->MsrLsr == 0)
 477                 mos7840_handle_new_msr(mos7840_port, regval);
 478         else if (mos7840_port->MsrLsr == 1)
 479                 mos7840_handle_new_lsr(mos7840_port, regval);
 480
 481 exit:
 482         spin_lock(&mos7840_port->pool_lock);
 483         if (!mos7840_port->zombie)
 484                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 485         spin_unlock(&mos7840_port->pool_lock);
 486         if (result) {
 487                 dev_err(&urb->dev->dev,
 488                         "%s - Error %d submitting interrupt urb\n",
 489                         __func__, result);
 490         }
 491 }
 492
 493 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 494                            __u16 *val)
 495 {
 496         struct usb_device *dev = mcs->port->serial->dev;
 497         struct usb_ctrlrequest *dr = mcs->dr;
 498         unsigned char *buffer = mcs->ctrl_buf;
 499         int ret;
 500
 501         dr->bRequestType = MCS_RD_RTYPE;
 502         dr->bRequest = MCS_RDREQ;
 503         dr->wValue = cpu_to_le16(Wval); /* 0 */
 504         dr->wIndex = cpu_to_le16(reg);
 505         dr->wLength = cpu_to_le16(2);
 506
 507         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 508                              (unsigned char *)dr, buffer, 2,
 509                              mos7840_control_callback, mcs);
 510         mcs->control_urb->transfer_buffer_length = 2;
 511         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 512         return ret;
 513 }
 514
 515 /*****************************************************************************
 516  * mos7840_interrupt_callback
 517  *      this is the callback function for when we have received data on the
 518  *      interrupt endpoint.
 519  *****************************************************************************/
 520
 521 static void mos7840_interrupt_callback(struct urb *urb)
 522 {
 523         int result;
 524         int length;
 525         struct moschip_port *mos7840_port;
 526         struct usb_serial *serial;
 527         __u16 Data;
 528         unsigned char *data;
 529         __u8 sp[5], st;
 530         int i, rv = 0;
 531         __u16 wval, wreg = 0;
 532         int status = urb->status;
 533
 534         dbg("%s", " : Entering\n");
 535
 536         switch (status) {
 537         case 0:
 538                 /* success */
 539                 break;
 540         case -ECONNRESET:
 541         case -ENOENT:
 542         case -ESHUTDOWN:
 543                 /* this urb is terminated, clean up */
 544                 dbg("%s - urb shutting down with status: %d", __func__,
 545                     status);
 546                 return;
 547         default:
 548                 dbg("%s - nonzero urb status received: %d", __func__,
 549                     status);
 550                 goto exit;
 551         }
 552
 553         length = urb->actual_length;
 554         data = urb->transfer_buffer;
 555
 556         serial = urb->context;
 557
 558         /* Moschip get 5 bytes
 559          * Byte 1 IIR Port 1 (port.number is 0)
 560          * Byte 2 IIR Port 2 (port.number is 1)
 561          * Byte 3 IIR Port 3 (port.number is 2)
 562          * Byte 4 IIR Port 4 (port.number is 3)
 563          * Byte 5 FIFO status for both */
 564
 565         if (length && length > 5) {
 566                 dbg("%s \n", "Wrong data !!!");
 567                 return;
 568         }
 569
 570         sp[0] = (__u8) data[0];
 571         sp[1] = (__u8) data[1];
 572         sp[2] = (__u8) data[2];
 573         sp[3] = (__u8) data[3];
 574         st = (__u8) data[4];
 575
 576         for (i = 0; i < serial->num_ports; i++) {
 577                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 578                 wval =
 579                     (((__u16) serial->port[i]->number -
 580                       (__u16) (serial->minor)) + 1) << 8;
 581                 if (mos7840_port->open) {
 582                         if (sp[i] & 0x01) {
 583                                 dbg("SP%d No Interrupt !!!\n", i);
 584                         } else {
 585                                 switch (sp[i] & 0x0f) {
 586                                 case SERIAL_IIR_RLS:
 587                                         dbg("Serial Port %d: Receiver status error or ", i);
 588                                         dbg("address bit detected in 9-bit mode\n");
 589                                         mos7840_port->MsrLsr = 1;
 590                                         wreg = LINE_STATUS_REGISTER;
 591                                         break;
 592                                 case SERIAL_IIR_MS:
 593                                         dbg("Serial Port %d: Modem status change\n", i);
 594                                         mos7840_port->MsrLsr = 0;
 595                                         wreg = MODEM_STATUS_REGISTER;
 596                                         break;
 597                                 }
 598                                 spin_lock(&mos7840_port->pool_lock);
 599                                 if (!mos7840_port->zombie) {
 600                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 601                                 } else {
 602                                         spin_unlock(&mos7840_port->pool_lock);
 603                                         return;
 604                                 }
 605                                 spin_unlock(&mos7840_port->pool_lock);
 606                         }
 607                 }
 608         }
 609         if (!(rv < 0))
 610                 /* the completion handler for the control urb will resubmit */
 611                 return;
 612 exit:
 613         result = usb_submit_urb(urb, GFP_ATOMIC);
 614         if (result) {
 615                 dev_err(&urb->dev->dev,
 616                         "%s - Error %d submitting interrupt urb\n",
 617                         __func__, result);
 618         }
 619 }
 620
 621 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 622                                        const char *function)
 623 {
 624         if (!port) {
 625                 dbg("%s - port == NULL", function);
 626                 return -1;
 627         }
 628         if (!port->serial) {
 629                 dbg("%s - port->serial == NULL", function);
 630                 return -1;
 631         }
 632
 633         return 0;
 634 }
 635
 636 /* Inline functions to check the sanity of a pointer that is passed to us */
 637 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 638                                          const char *function)
 639 {
 640         if (!serial) {
 641                 dbg("%s - serial == NULL", function);
 642                 return -1;
 643         }
 644         if (!serial->type) {
 645                 dbg("%s - serial->type == NULL!", function);
 646                 return -1;
 647         }
 648
 649         return 0;
 650 }
 651
 652 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 653                                                  const char *function)
 654 {
 655         /* if no port was specified, or it fails a paranoia check */
 656         if (!port ||
 657             mos7840_port_paranoia_check(port, function) ||
 658             mos7840_serial_paranoia_check(port->serial, function)) {
 659                 /* then say that we don't have a valid usb_serial thing,
 660                  * which will end up genrating -ENODEV return values */
 661                 return NULL;
 662         }
 663
 664         return port->serial;
 665 }
 666
 667 /*****************************************************************************
 668  * mos7840_bulk_in_callback
 669  *      this is the callback function for when we have received data on the
 670  *      bulk in endpoint.
 671  *****************************************************************************/
 672
 673 static void mos7840_bulk_in_callback(struct urb *urb)
 674 {
 675         int retval;
 676         unsigned char *data;
 677         struct usb_serial *serial;
 678         struct usb_serial_port *port;
 679         struct moschip_port *mos7840_port;
 680         struct tty_struct *tty;
 681         int status = urb->status;
 682
 683         mos7840_port = urb->context;
 684         if (!mos7840_port) {
 685                 dbg("%s", "NULL mos7840_port pointer \n");
 686                 mos7840_port->read_urb_busy = false;
 687                 return;
 688         }
 689
 690         if (status) {
 691                 dbg("nonzero read bulk status received: %d", status);
 692                 mos7840_port->read_urb_busy = false;
 693                 return;
 694         }
 695
 696         port = (struct usb_serial_port *)mos7840_port->port;
 697         if (mos7840_port_paranoia_check(port, __func__)) {
 698                 dbg("%s", "Port Paranoia failed \n");
 699                 mos7840_port->read_urb_busy = false;
 700                 return;
 701         }
 702
 703         serial = mos7840_get_usb_serial(port, __func__);
 704         if (!serial) {
 705                 dbg("%s\n", "Bad serial pointer ");
 706                 mos7840_port->read_urb_busy = false;
 707                 return;
 708         }
 709
 710         dbg("%s\n", "Entering... \n");
 711
 712         data = urb->transfer_buffer;
 713
 714         dbg("%s", "Entering ........... \n");
 715
 716         if (urb->actual_length) {
 717                 tty = tty_port_tty_get(&mos7840_port->port->port);
 718                 if (tty) {
 719                         tty_buffer_request_room(tty, urb->actual_length);
 720                         tty_insert_flip_string(tty, data, urb->actual_length);
 721                         dbg(" %s \n", data);
 722                         tty_flip_buffer_push(tty);
 723                         tty_kref_put(tty);
 724                 }
 725                 mos7840_port->icount.rx += urb->actual_length;
 726                 smp_wmb();
 727                 dbg("mos7840_port->icount.rx is %d:\n",
 728                     mos7840_port->icount.rx);
 729         }
 730
 731         if (!mos7840_port->read_urb) {
 732                 dbg("%s", "URB KILLED !!!\n");
 733                 mos7840_port->read_urb_busy = false;
 734                 return;
 735         }
 736
 737
 738         mos7840_port->read_urb->dev = serial->dev;
 739
 740         mos7840_port->read_urb_busy = true;
 741         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 742
 743         if (retval) {
 744                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 745                 mos7840_port->read_urb_busy = false;
 746         }
 747 }
 748
 749 /*****************************************************************************
 750  * mos7840_bulk_out_data_callback
 751  *      this is the callback function for when we have finished sending
 752  *      serial data on the bulk out endpoint.
 753  *****************************************************************************/
 754
 755 static void mos7840_bulk_out_data_callback(struct urb *urb)
 756 {
 757         struct moschip_port *mos7840_port;
 758         struct tty_struct *tty;
 759         int status = urb->status;
 760         int i;
 761
 762         mos7840_port = urb->context;
 763         spin_lock(&mos7840_port->pool_lock);
 764         for (i = 0; i < NUM_URBS; i++) {
 765                 if (urb == mos7840_port->write_urb_pool[i]) {
 766                         mos7840_port->busy[i] = 0;
 767                         break;
 768                 }
 769         }
 770         spin_unlock(&mos7840_port->pool_lock);
 771
 772         if (status) {
 773                 dbg("nonzero write bulk status received:%d\n", status);
 774                 return;
 775         }
 776
 777         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 778                 dbg("%s", "Port Paranoia failed \n");
 779                 return;
 780         }
 781
 782         dbg("%s \n", "Entering .........");
 783
 784         tty = tty_port_tty_get(&mos7840_port->port->port);
 785         if (tty && mos7840_port->open)
 786                 tty_wakeup(tty);
 787         tty_kref_put(tty);
 788
 789 }
 790
 791 /************************************************************************/
 792 /*       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       */
 793 /************************************************************************/
 794 #ifdef MCSSerialProbe
 795 static int mos7840_serial_probe(struct usb_serial *serial,
 796                                 const struct usb_device_id *id)
 797 {
 798
 799         /*need to implement the mode_reg reading and updating\
 800            structures usb_serial_ device_type\
 801            (i.e num_ports, num_bulkin,bulkout etc) */
 802         /* Also we can update the changes  attach */
 803         return 1;
 804 }
 805 #endif
 806
 807 /*****************************************************************************
 808  * mos7840_open
 809  *      this function is called by the tty driver when a port is opened
 810  *      If successful, we return 0
 811  *      Otherwise we return a negative error number.
 812  *****************************************************************************/
 813
 814 static int mos7840_open(struct tty_struct *tty,
 815                         struct usb_serial_port *port, struct file *filp)
 816 {
 817         int response;
 818         int j;
 819         struct usb_serial *serial;
 820         struct urb *urb;
 821         __u16 Data;
 822         int status;
 823         struct moschip_port *mos7840_port;
 824         struct moschip_port *port0;
 825
 826         if (mos7840_port_paranoia_check(port, __func__)) {
 827                 dbg("%s", "Port Paranoia failed \n");
 828                 return -ENODEV;
 829         }
 830
 831         serial = port->serial;
 832
 833         if (mos7840_serial_paranoia_check(serial, __func__)) {
 834                 dbg("%s", "Serial Paranoia failed \n");
 835                 return -ENODEV;
 836         }
 837
 838         mos7840_port = mos7840_get_port_private(port);
 839         port0 = mos7840_get_port_private(serial->port[0]);
 840
 841         if (mos7840_port == NULL || port0 == NULL)
 842                 return -ENODEV;
 843
 844         usb_clear_halt(serial->dev, port->write_urb->pipe);
 845         usb_clear_halt(serial->dev, port->read_urb->pipe);
 846         port0->open_ports++;
 847
 848         /* Initialising the write urb pool */
 849         for (j = 0; j < NUM_URBS; ++j) {
 850                 urb = usb_alloc_urb(0, GFP_KERNEL);
 851                 mos7840_port->write_urb_pool[j] = urb;
 852
 853                 if (urb == NULL) {
 854                         dev_err(&port->dev, "No more urbs???\n");
 855                         continue;
 856                 }
 857
 858                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 859                                                                 GFP_KERNEL);
 860                 if (!urb->transfer_buffer) {
 861                         usb_free_urb(urb);
 862                         mos7840_port->write_urb_pool[j] = NULL;
 863                         dev_err(&port->dev,
 864                                 "%s-out of memory for urb buffers.\n",
 865                                 __func__);
 866                         continue;
 867                 }
 868         }
 869
 870 /*****************************************************************************
 871  * Initialize MCS7840 -- Write Init values to corresponding Registers
 872  *
 873  * Register Index
 874  * 1 : IER
 875  * 2 : FCR
 876  * 3 : LCR
 877  * 4 : MCR
 878  *
 879  * 0x08 : SP1/2 Control Reg
 880  *****************************************************************************/
 881
 882         /* NEED to check the following Block */
 883
 884         Data = 0x0;
 885         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 886         if (status < 0) {
 887                 dbg("Reading Spreg failed\n");
 888                 return -1;
 889         }
 890         Data |= 0x80;
 891         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 892         if (status < 0) {
 893                 dbg("writing Spreg failed\n");
 894                 return -1;
 895         }
 896
 897         Data &= ~0x80;
 898         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 899         if (status < 0) {
 900                 dbg("writing Spreg failed\n");
 901                 return -1;
 902         }
 903         /* End of block to be checked */
 904
 905         Data = 0x0;
 906         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 907                                                                         &Data);
 908         if (status < 0) {
 909                 dbg("Reading Controlreg failed\n");
 910                 return -1;
 911         }
 912         Data |= 0x08;           /* Driver done bit */
 913         Data |= 0x20;           /* rx_disable */
 914         status = mos7840_set_reg_sync(port,
 915                                 mos7840_port->ControlRegOffset, Data);
 916         if (status < 0) {
 917                 dbg("writing Controlreg failed\n");
 918                 return -1;
 919         }
 920         /* do register settings here */
 921         /* Set all regs to the device default values. */
 922         /***********************************
 923          * First Disable all interrupts.
 924          ***********************************/
 925         Data = 0x00;
 926         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 927         if (status < 0) {
 928                 dbg("disableing interrupts failed\n");
 929                 return -1;
 930         }
 931         /* Set FIFO_CONTROL_REGISTER to the default value */
 932         Data = 0x00;
 933         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 934         if (status < 0) {
 935                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 936                 return -1;
 937         }
 938
 939         Data = 0xcf;
 940         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 941         if (status < 0) {
 942                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 943                 return -1;
 944         }
 945
 946         Data = 0x03;
 947         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 948         mos7840_port->shadowLCR = Data;
 949
 950         Data = 0x0b;
 951         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 952         mos7840_port->shadowMCR = Data;
 953
 954         Data = 0x00;
 955         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 956         mos7840_port->shadowLCR = Data;
 957
 958         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 959         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 960
 961         Data = 0x0c;
 962         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 963
 964         Data = 0x0;
 965         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 966
 967         Data = 0x00;
 968         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 969
 970         Data = Data & ~SERIAL_LCR_DLAB;
 971         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 972         mos7840_port->shadowLCR = Data;
 973
 974         /* clearing Bulkin and Bulkout Fifo */
 975         Data = 0x0;
 976         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 977
 978         Data = Data | 0x0c;
 979         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 980
 981         Data = Data & ~0x0c;
 982         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 983         /* Finally enable all interrupts */
 984         Data = 0x0c;
 985         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 986
 987         /* clearing rx_disable */
 988         Data = 0x0;
 989         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 990                                                                         &Data);
 991         Data = Data & ~0x20;
 992         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
 993                                                                         Data);
 994
 995         /* rx_negate */
 996         Data = 0x0;
 997         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 998                                                                         &Data);
 999         Data = Data | 0x10;
1000         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1001                                                                         Data);
1002
1003         /* force low_latency on so that our tty_push actually forces *
1004          * the data through,otherwise it is scheduled, and with      *
1005          * high data rates (like with OHCI) data can get lost.       */
1006         if (tty)
1007                 tty->low_latency = 1;
1008
1009         /* Check to see if we've set up our endpoint info yet    *
1010          * (can't set it up in mos7840_startup as the structures *
1011          * were not set up at that time.)                        */
1012         if (port0->open_ports == 1) {
1013                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1014                         /* set up interrupt urb */
1015                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1016                                 serial->dev,
1017                                 usb_rcvintpipe(serial->dev,
1018                                 serial->port[0]->interrupt_in_endpointAddress),
1019                                 serial->port[0]->interrupt_in_buffer,
1020                                 serial->port[0]->interrupt_in_urb->
1021                                 transfer_buffer_length,
1022                                 mos7840_interrupt_callback,
1023                                 serial,
1024                                 serial->port[0]->interrupt_in_urb->interval);
1025
1026                         /* start interrupt read for mos7840               *
1027                          * will continue as long as mos7840 is connected  */
1028
1029                         response =
1030                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1031                                            GFP_KERNEL);
1032                         if (response) {
1033                                 dev_err(&port->dev, "%s - Error %d submitting "
1034                                         "interrupt urb\n", __func__, response);
1035                         }
1036
1037                 }
1038
1039         }
1040
1041         /* see if we've set up our endpoint info yet   *
1042          * (can't set it up in mos7840_startup as the  *
1043          * structures were not set up at that time.)   */
1044
1045         dbg("port number is %d \n", port->number);
1046         dbg("serial number is %d \n", port->serial->minor);
1047         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1048         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1049         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1050         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1051         mos7840_port->read_urb = port->read_urb;
1052
1053         /* set up our bulk in urb */
1054
1055         usb_fill_bulk_urb(mos7840_port->read_urb,
1056                           serial->dev,
1057                           usb_rcvbulkpipe(serial->dev,
1058                                           port->bulk_in_endpointAddress),
1059                           port->bulk_in_buffer,
1060                           mos7840_port->read_urb->transfer_buffer_length,
1061                           mos7840_bulk_in_callback, mos7840_port);
1062
1063         dbg("mos7840_open: bulkin endpoint is %d\n",
1064             port->bulk_in_endpointAddress);
1065         mos7840_port->read_urb_busy = true;
1066         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1067         if (response) {
1068                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1069                         __func__, response);
1070                 mos7840_port->read_urb_busy = false;
1071         }
1072
1073         /* initialize our wait queues */
1074         init_waitqueue_head(&mos7840_port->wait_chase);
1075         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1076
1077         /* initialize our icount structure */
1078         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1079
1080         /* initialize our port settings */
1081         /* Must set to enable ints! */
1082         mos7840_port->shadowMCR = MCR_MASTER_IE;
1083         /* send a open port command */
1084         mos7840_port->open = 1;
1085         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1086         mos7840_port->icount.tx = 0;
1087         mos7840_port->icount.rx = 0;
1088
1089         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n",
1090                                 serial, mos7840_port, port);
1091
1092         return 0;
1093
1094 }
1095
1096 /*****************************************************************************
1097  * mos7840_chars_in_buffer
1098  *      this function is called by the tty driver when it wants to know how many
1099  *      bytes of data we currently have outstanding in the port (data that has
1100  *      been written, but hasn't made it out the port yet)
1101  *      If successful, we return the number of bytes left to be written in the
1102  *      system,
1103  *      Otherwise we return zero.
1104  *****************************************************************************/
1105
1106 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1107 {
1108         struct usb_serial_port *port = tty->driver_data;
1109         int i;
1110         int chars = 0;
1111         unsigned long flags;
1112         struct moschip_port *mos7840_port;
1113
1114         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1115
1116         if (mos7840_port_paranoia_check(port, __func__)) {
1117                 dbg("%s", "Invalid port \n");
1118                 return 0;
1119         }
1120
1121         mos7840_port = mos7840_get_port_private(port);
1122         if (mos7840_port == NULL) {
1123                 dbg("%s \n", "mos7840_break:leaving ...........");
1124                 return 0;
1125         }
1126
1127         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1128         for (i = 0; i < NUM_URBS; ++i)
1129                 if (mos7840_port->busy[i])
1130                         chars += URB_TRANSFER_BUFFER_SIZE;
1131         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1132         dbg("%s - returns %d", __func__, chars);
1133         return chars;
1134
1135 }
1136
1137 /************************************************************************
1138  *
1139  * mos7840_block_until_tx_empty
1140  *
1141  *      This function will block the close until one of the following:
1142  *              1. TX count are 0
1143  *              2. The mos7840 has stopped
1144  *              3. A timeout of 3 seconds without activity has expired
1145  *
1146  ************************************************************************/
1147 static void mos7840_block_until_tx_empty(struct tty_struct *tty,
1148                                 struct moschip_port *mos7840_port)
1149 {
1150         int timeout = HZ / 10;
1151         int wait = 30;
1152         int count;
1153
1154         while (1) {
1155
1156                 count = mos7840_chars_in_buffer(tty);
1157
1158                 /* Check for Buffer status */
1159                 if (count <= 0)
1160                         return;
1161
1162                 /* Block the thread for a while */
1163                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1164                                                timeout);
1165
1166                 /* No activity.. count down section */
1167                 wait--;
1168                 if (wait == 0) {
1169                         dbg("%s - TIMEOUT", __func__);
1170                         return;
1171                 } else {
1172                         /* Reset timeout value back to seconds */
1173                         wait = 30;
1174                 }
1175         }
1176 }
1177
1178 /*****************************************************************************
1179  * mos7840_close
1180  *      this function is called by the tty driver when a port is closed
1181  *****************************************************************************/
1182
1183 static void mos7840_close(struct tty_struct *tty,
1184                         struct usb_serial_port *port, struct file *filp)
1185 {
1186         struct usb_serial *serial;
1187         struct moschip_port *mos7840_port;
1188         struct moschip_port *port0;
1189         int j;
1190         __u16 Data;
1191
1192         dbg("%s\n", "mos7840_close:entering...");
1193
1194         if (mos7840_port_paranoia_check(port, __func__)) {
1195                 dbg("%s", "Port Paranoia failed \n");
1196                 return;
1197         }
1198
1199         serial = mos7840_get_usb_serial(port, __func__);
1200         if (!serial) {
1201                 dbg("%s", "Serial Paranoia failed \n");
1202                 return;
1203         }
1204
1205         mos7840_port = mos7840_get_port_private(port);
1206         port0 = mos7840_get_port_private(serial->port[0]);
1207
1208         if (mos7840_port == NULL || port0 == NULL)
1209                 return;
1210
1211         for (j = 0; j < NUM_URBS; ++j)
1212                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1213
1214         /* Freeing Write URBs */
1215         for (j = 0; j < NUM_URBS; ++j) {
1216                 if (mos7840_port->write_urb_pool[j]) {
1217                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1218                                 kfree(mos7840_port->write_urb_pool[j]->
1219                                       transfer_buffer);
1220
1221                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1222                 }
1223         }
1224
1225         if (serial->dev)
1226                 /* flush and block until tx is empty */
1227                 mos7840_block_until_tx_empty(tty, mos7840_port);
1228
1229         /* While closing port, shutdown all bulk read, write  *
1230          * and interrupt read if they exists                  */
1231         if (serial->dev) {
1232                 if (mos7840_port->write_urb) {
1233                         dbg("%s", "Shutdown bulk write\n");
1234                         usb_kill_urb(mos7840_port->write_urb);
1235                 }
1236                 if (mos7840_port->read_urb) {
1237                         dbg("%s", "Shutdown bulk read\n");
1238                         usb_kill_urb(mos7840_port->read_urb);
1239                         mos7840_port->read_urb_busy = false;
1240                 }
1241                 if ((&mos7840_port->control_urb)) {
1242                         dbg("%s", "Shutdown control read\n");
1243                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1244                 }
1245         }
1246 /*      if(mos7840_port->ctrl_buf != NULL) */
1247 /*              kfree(mos7840_port->ctrl_buf); */
1248         port0->open_ports--;
1249         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1250             port0->open_ports, port->number);
1251         if (port0->open_ports == 0) {
1252                 if (serial->port[0]->interrupt_in_urb) {
1253                         dbg("%s", "Shutdown interrupt_in_urb\n");
1254                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1255                 }
1256         }
1257
1258         if (mos7840_port->write_urb) {
1259                 /* if this urb had a transfer buffer already (old tx) free it */
1260                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1261                         kfree(mos7840_port->write_urb->transfer_buffer);
1262                 usb_free_urb(mos7840_port->write_urb);
1263         }
1264
1265         Data = 0x0;
1266         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1267
1268         Data = 0x00;
1269         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1270
1271         mos7840_port->open = 0;
1272
1273         dbg("%s \n", "Leaving ............");
1274 }
1275
1276 /************************************************************************
1277  *
1278  * mos7840_block_until_chase_response
1279  *
1280  *      This function will block the close until one of the following:
1281  *              1. Response to our Chase comes from mos7840
1282  *              2. A timeout of 10 seconds without activity has expired
1283  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1284  *
1285  ************************************************************************/
1286
1287 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1288                                         struct moschip_port *mos7840_port)
1289 {
1290         int timeout = 1 * HZ;
1291         int wait = 10;
1292         int count;
1293
1294         while (1) {
1295                 count = mos7840_chars_in_buffer(tty);
1296
1297                 /* Check for Buffer status */
1298                 if (count <= 0)
1299                         return;
1300
1301                 /* Block the thread for a while */
1302                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1303                                                timeout);
1304                 /* No activity.. count down section */
1305                 wait--;
1306                 if (wait == 0) {
1307                         dbg("%s - TIMEOUT", __func__);
1308                         return;
1309                 } else {
1310                         /* Reset timeout value back to seconds */
1311                         wait = 10;
1312                 }
1313         }
1314
1315 }
1316
1317 /*****************************************************************************
1318  * mos7840_break
1319  *      this function sends a break to the port
1320  *****************************************************************************/
1321 static void mos7840_break(struct tty_struct *tty, int break_state)
1322 {
1323         struct usb_serial_port *port = tty->driver_data;
1324         unsigned char data;
1325         struct usb_serial *serial;
1326         struct moschip_port *mos7840_port;
1327
1328         dbg("%s \n", "Entering ...........");
1329         dbg("mos7840_break: Start\n");
1330
1331         if (mos7840_port_paranoia_check(port, __func__)) {
1332                 dbg("%s", "Port Paranoia failed \n");
1333                 return;
1334         }
1335
1336         serial = mos7840_get_usb_serial(port, __func__);
1337         if (!serial) {
1338                 dbg("%s", "Serial Paranoia failed \n");
1339                 return;
1340         }
1341
1342         mos7840_port = mos7840_get_port_private(port);
1343
1344         if (mos7840_port == NULL)
1345                 return;
1346
1347         if (serial->dev)
1348                 /* flush and block until tx is empty */
1349                 mos7840_block_until_chase_response(tty, mos7840_port);
1350
1351         if (break_state == -1)
1352                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1353         else
1354                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1355
1356         /* FIXME: no locking on shadowLCR anywhere in driver */
1357         mos7840_port->shadowLCR = data;
1358         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1359             mos7840_port->shadowLCR);
1360         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1361                              mos7840_port->shadowLCR);
1362
1363         return;
1364 }
1365
1366 /*****************************************************************************
1367  * mos7840_write_room
1368  *      this function is called by the tty driver when it wants to know how many
1369  *      bytes of data we can accept for a specific port.
1370  *      If successful, we return the amount of room that we have for this port
1371  *      Otherwise we return a negative error number.
1372  *****************************************************************************/
1373
1374 static int mos7840_write_room(struct tty_struct *tty)
1375 {
1376         struct usb_serial_port *port = tty->driver_data;
1377         int i;
1378         int room = 0;
1379         unsigned long flags;
1380         struct moschip_port *mos7840_port;
1381
1382         dbg("%s \n", " mos7840_write_room:entering ...........");
1383
1384         if (mos7840_port_paranoia_check(port, __func__)) {
1385                 dbg("%s", "Invalid port \n");
1386                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1387                 return -1;
1388         }
1389
1390         mos7840_port = mos7840_get_port_private(port);
1391         if (mos7840_port == NULL) {
1392                 dbg("%s \n", "mos7840_break:leaving ...........");
1393                 return -1;
1394         }
1395
1396         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1397         for (i = 0; i < NUM_URBS; ++i) {
1398                 if (!mos7840_port->busy[i])
1399                         room += URB_TRANSFER_BUFFER_SIZE;
1400         }
1401         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1402
1403         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1404         dbg("%s - returns %d", __func__, 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 tty_struct *tty, 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         unsigned long flags;
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",
1434                                         mos7840_port->shadowLCR); */
1435
1436 #ifdef NOTMOS7840
1437         Data = 0x00;
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 = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1450
1451         /* Data = 0x0c; */
1452         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1453         Data = 0x00;
1454         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1455         dbg("mos7840_write:DLL value is %x\n", Data);
1456
1457         Data = 0x0;
1458         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1459         dbg("mos7840_write:DLM value is %x\n", Data);
1460
1461         Data = Data & ~SERIAL_LCR_DLAB;
1462         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1463             mos7840_port->shadowLCR);
1464         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1465 #endif
1466
1467         if (mos7840_port_paranoia_check(port, __func__)) {
1468                 dbg("%s", "Port Paranoia failed \n");
1469                 return -1;
1470         }
1471
1472         serial = port->serial;
1473         if (mos7840_serial_paranoia_check(serial, __func__)) {
1474                 dbg("%s", "Serial Paranoia failed \n");
1475                 return -1;
1476         }
1477
1478         mos7840_port = mos7840_get_port_private(port);
1479         if (mos7840_port == NULL) {
1480                 dbg("%s", "mos7840_port is NULL\n");
1481                 return -1;
1482         }
1483
1484         /* try to find a free urb in the list */
1485         urb = NULL;
1486
1487         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1488         for (i = 0; i < NUM_URBS; ++i) {
1489                 if (!mos7840_port->busy[i]) {
1490                         mos7840_port->busy[i] = 1;
1491                         urb = mos7840_port->write_urb_pool[i];
1492                         dbg("\nURB:%d", i);
1493                         break;
1494                 }
1495         }
1496         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1497
1498         if (urb == NULL) {
1499                 dbg("%s - no more free urbs", __func__);
1500                 goto exit;
1501         }
1502
1503         if (urb->transfer_buffer == NULL) {
1504                 urb->transfer_buffer =
1505                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1506
1507                 if (urb->transfer_buffer == NULL) {
1508                         dev_err(&port->dev, "%s no more kernel memory...\n",
1509                                 __func__);
1510                         goto exit;
1511                 }
1512         }
1513         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1514
1515         memcpy(urb->transfer_buffer, current_position, transfer_size);
1516
1517         /* fill urb with data and submit  */
1518         usb_fill_bulk_urb(urb,
1519                           serial->dev,
1520                           usb_sndbulkpipe(serial->dev,
1521                                           port->bulk_out_endpointAddress),
1522                           urb->transfer_buffer,
1523                           transfer_size,
1524                           mos7840_bulk_out_data_callback, mos7840_port);
1525
1526         data1 = urb->transfer_buffer;
1527         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1528
1529         /* send it down the pipe */
1530         status = usb_submit_urb(urb, GFP_ATOMIC);
1531
1532         if (status) {
1533                 mos7840_port->busy[i] = 0;
1534                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1535                         "with status = %d\n", __func__, status);
1536                 bytes_sent = status;
1537                 goto exit;
1538         }
1539         bytes_sent = transfer_size;
1540         mos7840_port->icount.tx += transfer_size;
1541         smp_wmb();
1542         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1543 exit:
1544         return bytes_sent;
1545
1546 }
1547
1548 /*****************************************************************************
1549  * mos7840_throttle
1550  *      this function is called by the tty driver when it wants to stop the data
1551  *      being read from the port.
1552  *****************************************************************************/
1553
1554 static void mos7840_throttle(struct tty_struct *tty)
1555 {
1556         struct usb_serial_port *port = tty->driver_data;
1557         struct moschip_port *mos7840_port;
1558         int status;
1559
1560         if (mos7840_port_paranoia_check(port, __func__)) {
1561                 dbg("%s", "Invalid port \n");
1562                 return;
1563         }
1564
1565         dbg("- port %d\n", port->number);
1566
1567         mos7840_port = mos7840_get_port_private(port);
1568
1569         if (mos7840_port == NULL)
1570                 return;
1571
1572         if (!mos7840_port->open) {
1573                 dbg("%s\n", "port not opened");
1574                 return;
1575         }
1576
1577         dbg("%s", "Entering .......... \n");
1578
1579         /* if we are implementing XON/XOFF, send the stop character */
1580         if (I_IXOFF(tty)) {
1581                 unsigned char stop_char = STOP_CHAR(tty);
1582                 status = mos7840_write(tty, port, &stop_char, 1);
1583                 if (status <= 0)
1584                         return;
1585         }
1586         /* if we are implementing RTS/CTS, toggle that line */
1587         if (tty->termios->c_cflag & CRTSCTS) {
1588                 mos7840_port->shadowMCR &= ~MCR_RTS;
1589                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1590                                          mos7840_port->shadowMCR);
1591                 if (status < 0)
1592                         return;
1593         }
1594
1595         return;
1596 }
1597
1598 /*****************************************************************************
1599  * mos7840_unthrottle
1600  *      this function is called by the tty driver when it wants to resume
1601  *      the data being read from the port (called after mos7840_throttle is
1602  *      called)
1603  *****************************************************************************/
1604 static void mos7840_unthrottle(struct tty_struct *tty)
1605 {
1606         struct usb_serial_port *port = tty->driver_data;
1607         int status;
1608         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1609
1610         if (mos7840_port_paranoia_check(port, __func__)) {
1611                 dbg("%s", "Invalid port \n");
1612                 return;
1613         }
1614
1615         if (mos7840_port == NULL)
1616                 return;
1617
1618         if (!mos7840_port->open) {
1619                 dbg("%s - port not opened", __func__);
1620                 return;
1621         }
1622
1623         dbg("%s", "Entering .......... \n");
1624
1625         /* if we are implementing XON/XOFF, send the start character */
1626         if (I_IXOFF(tty)) {
1627                 unsigned char start_char = START_CHAR(tty);
1628                 status = mos7840_write(tty, port, &start_char, 1);
1629                 if (status <= 0)
1630                         return;
1631         }
1632
1633         /* if we are implementing RTS/CTS, toggle that line */
1634         if (tty->termios->c_cflag & CRTSCTS) {
1635                 mos7840_port->shadowMCR |= MCR_RTS;
1636                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1637                                          mos7840_port->shadowMCR);
1638                 if (status < 0)
1639                         return;
1640         }
1641 }
1642
1643 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1644 {
1645         struct usb_serial_port *port = tty->driver_data;
1646         struct moschip_port *mos7840_port;
1647         unsigned int result;
1648         __u16 msr;
1649         __u16 mcr;
1650         int status;
1651         mos7840_port = mos7840_get_port_private(port);
1652
1653         dbg("%s - port %d", __func__, port->number);
1654
1655         if (mos7840_port == NULL)
1656                 return -ENODEV;
1657
1658         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1659         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1660         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1661             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1662             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1663             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1664             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1665             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1666             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1667
1668         dbg("%s - 0x%04X", __func__, result);
1669
1670         return result;
1671 }
1672
1673 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1674                             unsigned int set, unsigned int clear)
1675 {
1676         struct usb_serial_port *port = tty->driver_data;
1677         struct moschip_port *mos7840_port;
1678         unsigned int mcr;
1679         int status;
1680
1681         dbg("%s - port %d", __func__, port->number);
1682
1683         mos7840_port = mos7840_get_port_private(port);
1684
1685         if (mos7840_port == NULL)
1686                 return -ENODEV;
1687
1688         /* FIXME: What locks the port registers ? */
1689         mcr = mos7840_port->shadowMCR;
1690         if (clear & TIOCM_RTS)
1691                 mcr &= ~MCR_RTS;
1692         if (clear & TIOCM_DTR)
1693                 mcr &= ~MCR_DTR;
1694         if (clear & TIOCM_LOOP)
1695                 mcr &= ~MCR_LOOPBACK;
1696
1697         if (set & TIOCM_RTS)
1698                 mcr |= MCR_RTS;
1699         if (set & TIOCM_DTR)
1700                 mcr |= MCR_DTR;
1701         if (set & TIOCM_LOOP)
1702                 mcr |= MCR_LOOPBACK;
1703
1704         mos7840_port->shadowMCR = mcr;
1705
1706         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1707         if (status < 0) {
1708                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1709                 return status;
1710         }
1711
1712         return 0;
1713 }
1714
1715 /*****************************************************************************
1716  * mos7840_calc_baud_rate_divisor
1717  *      this function calculates the proper baud rate divisor for the specified
1718  *      baud rate.
1719  *****************************************************************************/
1720 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1721                                           __u16 *clk_sel_val)
1722 {
1723
1724         dbg("%s - %d", __func__, baudRate);
1725
1726         if (baudRate <= 115200) {
1727                 *divisor = 115200 / baudRate;
1728                 *clk_sel_val = 0x0;
1729         }
1730         if ((baudRate > 115200) && (baudRate <= 230400)) {
1731                 *divisor = 230400 / baudRate;
1732                 *clk_sel_val = 0x10;
1733         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1734                 *divisor = 403200 / baudRate;
1735                 *clk_sel_val = 0x20;
1736         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1737                 *divisor = 460800 / baudRate;
1738                 *clk_sel_val = 0x30;
1739         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1740                 *divisor = 806400 / baudRate;
1741                 *clk_sel_val = 0x40;
1742         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1743                 *divisor = 921600 / baudRate;
1744                 *clk_sel_val = 0x50;
1745         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1746                 *divisor = 1572864 / baudRate;
1747                 *clk_sel_val = 0x60;
1748         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1749                 *divisor = 3145728 / baudRate;
1750                 *clk_sel_val = 0x70;
1751         }
1752         return 0;
1753
1754 #ifdef NOTMCS7840
1755
1756         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1757                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1758                         *divisor = mos7840_divisor_table[i].Divisor;
1759                         return 0;
1760                 }
1761         }
1762
1763         /* After trying for all the standard baud rates    *
1764          * Try calculating the divisor for this baud rate  */
1765
1766         if (baudrate > 75 && baudrate < 230400) {
1767                 /* get the divisor */
1768                 custom = (__u16) (230400L / baudrate);
1769
1770                 /* Check for round off */
1771                 round1 = (__u16) (2304000L / baudrate);
1772                 round = (__u16) (round1 - (custom * 10));
1773                 if (round > 4)
1774                         custom++;
1775                 *divisor = custom;
1776
1777                 dbg(" Baud %d = %d\n", baudrate, custom);
1778                 return 0;
1779         }
1780
1781         dbg("%s\n", " Baud calculation Failed...");
1782         return -1;
1783 #endif
1784 }
1785
1786 /*****************************************************************************
1787  * mos7840_send_cmd_write_baud_rate
1788  *      this function sends the proper command to change the baud rate of the
1789  *      specified port.
1790  *****************************************************************************/
1791
1792 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1793                                             int baudRate)
1794 {
1795         int divisor = 0;
1796         int status;
1797         __u16 Data;
1798         unsigned char number;
1799         __u16 clk_sel_val;
1800         struct usb_serial_port *port;
1801
1802         if (mos7840_port == NULL)
1803                 return -1;
1804
1805         port = (struct usb_serial_port *)mos7840_port->port;
1806         if (mos7840_port_paranoia_check(port, __func__)) {
1807                 dbg("%s", "Invalid port \n");
1808                 return -1;
1809         }
1810
1811         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1812                 dbg("%s", "Invalid Serial \n");
1813                 return -1;
1814         }
1815
1816         dbg("%s", "Entering .......... \n");
1817
1818         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1819
1820         dbg("%s - port = %d, baud = %d", __func__,
1821             mos7840_port->port->number, baudRate);
1822         /* reset clk_uart_sel in spregOffset */
1823         if (baudRate > 115200) {
1824 #ifdef HW_flow_control
1825                 /* NOTE: need to see the pther register to modify */
1826                 /* setting h/w flow control bit to 1 */
1827                 Data = 0x2b;
1828                 mos7840_port->shadowMCR = Data;
1829                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1830                                                                         Data);
1831                 if (status < 0) {
1832                         dbg("Writing spreg failed in set_serial_baud\n");
1833                         return -1;
1834                 }
1835 #endif
1836
1837         } else {
1838 #ifdef HW_flow_control
1839                 / *setting h/w flow control bit to 0 */
1840                 Data = 0xb;
1841                 mos7840_port->shadowMCR = Data;
1842                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1843                                                                         Data);
1844                 if (status < 0) {
1845                         dbg("Writing spreg failed in set_serial_baud\n");
1846                         return -1;
1847                 }
1848 #endif
1849
1850         }
1851
1852         if (1) {                /* baudRate <= 115200) */
1853                 clk_sel_val = 0x0;
1854                 Data = 0x0;
1855                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1856                                                    &clk_sel_val);
1857                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1858                                                                  &Data);
1859                 if (status < 0) {
1860                         dbg("reading spreg failed in set_serial_baud\n");
1861                         return -1;
1862                 }
1863                 Data = (Data & 0x8f) | clk_sel_val;
1864                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1865                                                                 Data);
1866                 if (status < 0) {
1867                         dbg("Writing spreg failed in set_serial_baud\n");
1868                         return -1;
1869                 }
1870                 /* Calculate the Divisor */
1871
1872                 if (status) {
1873                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1874                         return status;
1875                 }
1876                 /* Enable access to divisor latch */
1877                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1878                 mos7840_port->shadowLCR = Data;
1879                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1880
1881                 /* Write the divisor */
1882                 Data = (unsigned char)(divisor & 0xff);
1883                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1884                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1885
1886                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1887                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1888                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1889
1890                 /* Disable access to divisor latch */
1891                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1892                 mos7840_port->shadowLCR = Data;
1893                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1894
1895         }
1896         return status;
1897 }
1898
1899 /*****************************************************************************
1900  * mos7840_change_port_settings
1901  *      This routine is called to set the UART on the device to match
1902  *      the specified new settings.
1903  *****************************************************************************/
1904
1905 static void mos7840_change_port_settings(struct tty_struct *tty,
1906         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1907 {
1908         int baud;
1909         unsigned cflag;
1910         unsigned iflag;
1911         __u8 lData;
1912         __u8 lParity;
1913         __u8 lStop;
1914         int status;
1915         __u16 Data;
1916         struct usb_serial_port *port;
1917         struct usb_serial *serial;
1918
1919         if (mos7840_port == NULL)
1920                 return;
1921
1922         port = (struct usb_serial_port *)mos7840_port->port;
1923
1924         if (mos7840_port_paranoia_check(port, __func__)) {
1925                 dbg("%s", "Invalid port \n");
1926                 return;
1927         }
1928
1929         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1930                 dbg("%s", "Invalid Serial \n");
1931                 return;
1932         }
1933
1934         serial = port->serial;
1935
1936         dbg("%s - port %d", __func__, mos7840_port->port->number);
1937
1938         if (!mos7840_port->open) {
1939                 dbg("%s - port not opened", __func__);
1940                 return;
1941         }
1942
1943         dbg("%s", "Entering .......... \n");
1944
1945         lData = LCR_BITS_8;
1946         lStop = LCR_STOP_1;
1947         lParity = LCR_PAR_NONE;
1948
1949         cflag = tty->termios->c_cflag;
1950         iflag = tty->termios->c_iflag;
1951
1952         /* Change the number of bits */
1953         if (cflag & CSIZE) {
1954                 switch (cflag & CSIZE) {
1955                 case CS5:
1956                         lData = LCR_BITS_5;
1957                         break;
1958
1959                 case CS6:
1960                         lData = LCR_BITS_6;
1961                         break;
1962
1963                 case CS7:
1964                         lData = LCR_BITS_7;
1965                         break;
1966                 default:
1967                 case CS8:
1968                         lData = LCR_BITS_8;
1969                         break;
1970                 }
1971         }
1972         /* Change the Parity bit */
1973         if (cflag & PARENB) {
1974                 if (cflag & PARODD) {
1975                         lParity = LCR_PAR_ODD;
1976                         dbg("%s - parity = odd", __func__);
1977                 } else {
1978                         lParity = LCR_PAR_EVEN;
1979                         dbg("%s - parity = even", __func__);
1980                 }
1981
1982         } else {
1983                 dbg("%s - parity = none", __func__);
1984         }
1985
1986         if (cflag & CMSPAR)
1987                 lParity = lParity | 0x20;
1988
1989         /* Change the Stop bit */
1990         if (cflag & CSTOPB) {
1991                 lStop = LCR_STOP_2;
1992                 dbg("%s - stop bits = 2", __func__);
1993         } else {
1994                 lStop = LCR_STOP_1;
1995                 dbg("%s - stop bits = 1", __func__);
1996         }
1997
1998         /* Update the LCR with the correct value */
1999         mos7840_port->shadowLCR &=
2000             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2001         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2002
2003         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2004             mos7840_port->shadowLCR);
2005         /* Disable Interrupts */
2006         Data = 0x00;
2007         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2008
2009         Data = 0x00;
2010         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2011
2012         Data = 0xcf;
2013         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2014
2015         /* Send the updated LCR value to the mos7840 */
2016         Data = mos7840_port->shadowLCR;
2017
2018         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2019
2020         Data = 0x00b;
2021         mos7840_port->shadowMCR = Data;
2022         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2023         Data = 0x00b;
2024         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2025
2026         /* set up the MCR register and send it to the mos7840 */
2027
2028         mos7840_port->shadowMCR = MCR_MASTER_IE;
2029         if (cflag & CBAUD)
2030                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2031
2032         if (cflag & CRTSCTS)
2033                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2034         else
2035                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2036
2037         Data = mos7840_port->shadowMCR;
2038         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2039
2040         /* Determine divisor based on baud rate */
2041         baud = tty_get_baud_rate(tty);
2042
2043         if (!baud) {
2044                 /* pick a default, any default... */
2045                 dbg("%s\n", "Picked default baud...");
2046                 baud = 9600;
2047         }
2048
2049         dbg("%s - baud rate = %d", __func__, baud);
2050         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2051
2052         /* Enable Interrupts */
2053         Data = 0x0c;
2054         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2055
2056         if (mos7840_port->read_urb_busy == false) {
2057                 mos7840_port->read_urb->dev = serial->dev;
2058                 mos7840_port->read_urb_busy = true;
2059                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2060                 if (status) {
2061                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2062                             status);
2063                         mos7840_port->read_urb_busy = false;
2064                 }
2065         }
2066         wake_up(&mos7840_port->delta_msr_wait);
2067         mos7840_port->delta_msr_cond = 1;
2068         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2069             mos7840_port->shadowLCR);
2070
2071         return;
2072 }
2073
2074 /*****************************************************************************
2075  * mos7840_set_termios
2076  *      this function is called by the tty driver when it wants to change
2077  *      the termios structure
2078  *****************************************************************************/
2079
2080 static void mos7840_set_termios(struct tty_struct *tty,
2081                                 struct usb_serial_port *port,
2082                                 struct ktermios *old_termios)
2083 {
2084         int status;
2085         unsigned int cflag;
2086         struct usb_serial *serial;
2087         struct moschip_port *mos7840_port;
2088         dbg("mos7840_set_termios: START\n");
2089         if (mos7840_port_paranoia_check(port, __func__)) {
2090                 dbg("%s", "Invalid port \n");
2091                 return;
2092         }
2093
2094         serial = port->serial;
2095
2096         if (mos7840_serial_paranoia_check(serial, __func__)) {
2097                 dbg("%s", "Invalid Serial \n");
2098                 return;
2099         }
2100
2101         mos7840_port = mos7840_get_port_private(port);
2102
2103         if (mos7840_port == NULL)
2104                 return;
2105
2106         if (!mos7840_port->open) {
2107                 dbg("%s - port not opened", __func__);
2108                 return;
2109         }
2110
2111         dbg("%s\n", "setting termios - ");
2112
2113         cflag = tty->termios->c_cflag;
2114
2115         dbg("%s - clfag %08x iflag %08x", __func__,
2116             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2117         dbg("%s - old clfag %08x old iflag %08x", __func__,
2118             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2119         dbg("%s - port %d", __func__, port->number);
2120
2121         /* change the port settings to the new ones specified */
2122
2123         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2124
2125         if (!mos7840_port->read_urb) {
2126                 dbg("%s", "URB KILLED !!!!!\n");
2127                 return;
2128         }
2129
2130         if (mos7840_port->read_urb_busy == false) {
2131                 mos7840_port->read_urb->dev = serial->dev;
2132                 mos7840_port->read_urb_busy = true;
2133                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2134                 if (status) {
2135                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2136                             status);
2137                         mos7840_port->read_urb_busy = false;
2138                 }
2139         }
2140         return;
2141 }
2142
2143 /*****************************************************************************
2144  * mos7840_get_lsr_info - get line status register info
2145  *
2146  * Purpose: Let user call ioctl() to get info when the UART physically
2147  *          is emptied.  On bus types like RS485, the transmitter must
2148  *          release the bus after transmitting. This must be done when
2149  *          the transmit shift register is empty, not be done when the
2150  *          transmit holding register is empty.  This functionality
2151  *          allows an RS485 driver to be written in user space.
2152  *****************************************************************************/
2153
2154 static int mos7840_get_lsr_info(struct tty_struct *tty,
2155                                 unsigned int __user *value)
2156 {
2157         int count;
2158         unsigned int result = 0;
2159
2160         count = mos7840_chars_in_buffer(tty);
2161         if (count == 0) {
2162                 dbg("%s -- Empty", __func__);
2163                 result = TIOCSER_TEMT;
2164         }
2165
2166         if (copy_to_user(value, &result, sizeof(int)))
2167                 return -EFAULT;
2168         return 0;
2169 }
2170
2171 /*****************************************************************************
2172  * mos7840_set_modem_info
2173  *      function to set modem info
2174  *****************************************************************************/
2175
2176 /* FIXME: Should be using the model control hooks */
2177
2178 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2179                                   unsigned int cmd, unsigned int __user *value)
2180 {
2181         unsigned int mcr;
2182         unsigned int arg;
2183         __u16 Data;
2184         int status;
2185         struct usb_serial_port *port;
2186
2187         if (mos7840_port == NULL)
2188                 return -1;
2189
2190         port = (struct usb_serial_port *)mos7840_port->port;
2191         if (mos7840_port_paranoia_check(port, __func__)) {
2192                 dbg("%s", "Invalid port \n");
2193                 return -1;
2194         }
2195
2196         mcr = mos7840_port->shadowMCR;
2197
2198         if (copy_from_user(&arg, value, sizeof(int)))
2199                 return -EFAULT;
2200
2201         switch (cmd) {
2202         case TIOCMBIS:
2203                 if (arg & TIOCM_RTS)
2204                         mcr |= MCR_RTS;
2205                 if (arg & TIOCM_DTR)
2206                         mcr |= MCR_RTS;
2207                 if (arg & TIOCM_LOOP)
2208                         mcr |= MCR_LOOPBACK;
2209                 break;
2210
2211         case TIOCMBIC:
2212                 if (arg & TIOCM_RTS)
2213                         mcr &= ~MCR_RTS;
2214                 if (arg & TIOCM_DTR)
2215                         mcr &= ~MCR_RTS;
2216                 if (arg & TIOCM_LOOP)
2217                         mcr &= ~MCR_LOOPBACK;
2218                 break;
2219
2220         case TIOCMSET:
2221                 /* turn off the RTS and DTR and LOOPBACK
2222                  * and then only turn on what was asked to */
2223                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2224                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2225                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2226                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2227                 break;
2228         }
2229
2230         lock_kernel();
2231         mos7840_port->shadowMCR = mcr;
2232
2233         Data = mos7840_port->shadowMCR;
2234         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2235         unlock_kernel();
2236         if (status < 0) {
2237                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2238                 return -1;
2239         }
2240
2241         return 0;
2242 }
2243
2244 /*****************************************************************************
2245  * mos7840_get_modem_info
2246  *      function to get modem info
2247  *****************************************************************************/
2248
2249 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2250                                   unsigned int __user *value)
2251 {
2252         unsigned int result = 0;
2253         __u16 msr;
2254         unsigned int mcr = mos7840_port->shadowMCR;
2255         mos7840_get_uart_reg(mos7840_port->port,
2256                                                 MODEM_STATUS_REGISTER, &msr);
2257         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2258             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2259             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2260             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2261             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2262             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2263
2264         dbg("%s -- %x", __func__, result);
2265
2266         if (copy_to_user(value, &result, sizeof(int)))
2267                 return -EFAULT;
2268         return 0;
2269 }
2270
2271 /*****************************************************************************
2272  * mos7840_get_serial_info
2273  *      function to get information about serial port
2274  *****************************************************************************/
2275
2276 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2277                                    struct serial_struct __user *retinfo)
2278 {
2279         struct serial_struct tmp;
2280
2281         if (mos7840_port == NULL)
2282                 return -1;
2283
2284         if (!retinfo)
2285                 return -EFAULT;
2286
2287         memset(&tmp, 0, sizeof(tmp));
2288
2289         tmp.type = PORT_16550A;
2290         tmp.line = mos7840_port->port->serial->minor;
2291         tmp.port = mos7840_port->port->number;
2292         tmp.irq = 0;
2293         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2294         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2295         tmp.baud_base = 9600;
2296         tmp.close_delay = 5 * HZ;
2297         tmp.closing_wait = 30 * HZ;
2298
2299         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2300                 return -EFAULT;
2301         return 0;
2302 }
2303
2304 /*****************************************************************************
2305  * SerialIoctl
2306  *      this function handles any ioctl calls to the driver
2307  *****************************************************************************/
2308
2309 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2310                          unsigned int cmd, unsigned long arg)
2311 {
2312         struct usb_serial_port *port = tty->driver_data;
2313         void __user *argp = (void __user *)arg;
2314         struct moschip_port *mos7840_port;
2315
2316         struct async_icount cnow;
2317         struct async_icount cprev;
2318         struct serial_icounter_struct icount;
2319         int mosret = 0;
2320
2321         if (mos7840_port_paranoia_check(port, __func__)) {
2322                 dbg("%s", "Invalid port \n");
2323                 return -1;
2324         }
2325
2326         mos7840_port = mos7840_get_port_private(port);
2327
2328         if (mos7840_port == NULL)
2329                 return -1;
2330
2331         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2332
2333         switch (cmd) {
2334                 /* return number of bytes available */
2335
2336         case TIOCSERGETLSR:
2337                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2338                 return mos7840_get_lsr_info(tty, argp);
2339                 return 0;
2340
2341         /* FIXME: use the modem hooks and remove this */
2342         case TIOCMBIS:
2343         case TIOCMBIC:
2344         case TIOCMSET:
2345                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2346                     port->number);
2347                 mosret =
2348                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2349                 return mosret;
2350
2351         case TIOCMGET:
2352                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2353                 return mos7840_get_modem_info(mos7840_port, argp);
2354
2355         case TIOCGSERIAL:
2356                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2357                 return mos7840_get_serial_info(mos7840_port, argp);
2358
2359         case TIOCSSERIAL:
2360                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2361                 break;
2362
2363         case TIOCMIWAIT:
2364                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2365                 cprev = mos7840_port->icount;
2366                 while (1) {
2367                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2368                         mos7840_port->delta_msr_cond = 0;
2369                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2370                                                  (mos7840_port->
2371                                                   delta_msr_cond == 1));
2372
2373                         /* see if a signal did it */
2374                         if (signal_pending(current))
2375                                 return -ERESTARTSYS;
2376                         cnow = mos7840_port->icount;
2377                         smp_rmb();
2378                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2379                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2380                                 return -EIO;    /* no change => error */
2381                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2382                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2383                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2384                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2385                                 return 0;
2386                         }
2387                         cprev = cnow;
2388                 }
2389                 /* NOTREACHED */
2390                 break;
2391
2392         case TIOCGICOUNT:
2393                 cnow = mos7840_port->icount;
2394                 smp_rmb();
2395                 icount.cts = cnow.cts;
2396                 icount.dsr = cnow.dsr;
2397                 icount.rng = cnow.rng;
2398                 icount.dcd = cnow.dcd;
2399                 icount.rx = cnow.rx;
2400                 icount.tx = cnow.tx;
2401                 icount.frame = cnow.frame;
2402                 icount.overrun = cnow.overrun;
2403                 icount.parity = cnow.parity;
2404                 icount.brk = cnow.brk;
2405                 icount.buf_overrun = cnow.buf_overrun;
2406
2407                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2408                     port->number, icount.rx, icount.tx);
2409                 if (copy_to_user(argp, &icount, sizeof(icount)))
2410                         return -EFAULT;
2411                 return 0;
2412         default:
2413                 break;
2414         }
2415         return -ENOIOCTLCMD;
2416 }
2417
2418 static int mos7840_calc_num_ports(struct usb_serial *serial)
2419 {
2420         int mos7840_num_ports = 0;
2421
2422         dbg("numberofendpoints: %d \n",
2423             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2424         dbg("numberofendpoints: %d \n",
2425             (int)serial->interface->altsetting->desc.bNumEndpoints);
2426         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2427                 mos7840_num_ports = serial->num_ports = 2;
2428         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2429                 serial->num_bulk_in = 4;
2430                 serial->num_bulk_out = 4;
2431                 mos7840_num_ports = serial->num_ports = 4;
2432         }
2433
2434         return mos7840_num_ports;
2435 }
2436
2437 /****************************************************************************
2438  * mos7840_startup
2439  ****************************************************************************/
2440
2441 static int mos7840_startup(struct usb_serial *serial)
2442 {
2443         struct moschip_port *mos7840_port;
2444         struct usb_device *dev;
2445         int i, status;
2446
2447         __u16 Data;
2448         dbg("%s \n", " mos7840_startup :entering..........");
2449
2450         if (!serial) {
2451                 dbg("%s\n", "Invalid Handler");
2452                 return -1;
2453         }
2454
2455         dev = serial->dev;
2456
2457         dbg("%s\n", "Entering...");
2458
2459         /* we set up the pointers to the endpoints in the mos7840_open *
2460          * function, as the structures aren't created yet.             */
2461
2462         /* set up port private structures */
2463         for (i = 0; i < serial->num_ports; ++i) {
2464                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2465                 if (mos7840_port == NULL) {
2466                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2467                         status = -ENOMEM;
2468                         i--; /* don't follow NULL pointer cleaning up */
2469                         goto error;
2470                 }
2471
2472                 /* Initialize all port interrupt end point to port 0 int
2473                  * endpoint. Our device has only one interrupt end point
2474                  * common to all port */
2475
2476                 mos7840_port->port = serial->port[i];
2477                 mos7840_set_port_private(serial->port[i], mos7840_port);
2478                 spin_lock_init(&mos7840_port->pool_lock);
2479
2480                 mos7840_port->port_num = ((serial->port[i]->number -
2481                                            (serial->port[i]->serial->minor)) +
2482                                           1);
2483
2484                 if (mos7840_port->port_num == 1) {
2485                         mos7840_port->SpRegOffset = 0x0;
2486                         mos7840_port->ControlRegOffset = 0x1;
2487                         mos7840_port->DcrRegOffset = 0x4;
2488                 } else if ((mos7840_port->port_num == 2)
2489                            && (serial->num_ports == 4)) {
2490                         mos7840_port->SpRegOffset = 0x8;
2491                         mos7840_port->ControlRegOffset = 0x9;
2492                         mos7840_port->DcrRegOffset = 0x16;
2493                 } else if ((mos7840_port->port_num == 2)
2494                            && (serial->num_ports == 2)) {
2495                         mos7840_port->SpRegOffset = 0xa;
2496                         mos7840_port->ControlRegOffset = 0xb;
2497                         mos7840_port->DcrRegOffset = 0x19;
2498                 } else if ((mos7840_port->port_num == 3)
2499                            && (serial->num_ports == 4)) {
2500                         mos7840_port->SpRegOffset = 0xa;
2501                         mos7840_port->ControlRegOffset = 0xb;
2502                         mos7840_port->DcrRegOffset = 0x19;
2503                 } else if ((mos7840_port->port_num == 4)
2504                            && (serial->num_ports == 4)) {
2505                         mos7840_port->SpRegOffset = 0xc;
2506                         mos7840_port->ControlRegOffset = 0xd;
2507                         mos7840_port->DcrRegOffset = 0x1c;
2508                 }
2509                 mos7840_dump_serial_port(mos7840_port);
2510                 mos7840_set_port_private(serial->port[i], mos7840_port);
2511
2512                 /* enable rx_disable bit in control register */
2513                 status = mos7840_get_reg_sync(serial->port[i],
2514                                  mos7840_port->ControlRegOffset, &Data);
2515                 if (status < 0) {
2516                         dbg("Reading ControlReg failed status-0x%x\n", status);
2517                         break;
2518                 } else
2519                         dbg("ControlReg Reading success val is %x, status%d\n",
2520                             Data, status);
2521                 Data |= 0x08;   /* setting driver done bit */
2522                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2523                                    modem status reg */
2524
2525                 /* Data |= 0x20; //rx_disable bit */
2526                 status = mos7840_set_reg_sync(serial->port[i],
2527                                          mos7840_port->ControlRegOffset, Data);
2528                 if (status < 0) {
2529                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2530                         break;
2531                 } else
2532                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2533                             status);
2534
2535                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2536                    and 0x24 in DCR3 */
2537                 Data = 0x01;
2538                 status = mos7840_set_reg_sync(serial->port[i],
2539                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2540                 if (status < 0) {
2541                         dbg("Writing DCR0 failed status-0x%x\n", status);
2542                         break;
2543                 } else
2544                         dbg("DCR0 Writing success status%d\n", status);
2545
2546                 Data = 0x05;
2547                 status = mos7840_set_reg_sync(serial->port[i],
2548                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2549                 if (status < 0) {
2550                         dbg("Writing DCR1 failed status-0x%x\n", status);
2551                         break;
2552                 } else
2553                         dbg("DCR1 Writing success status%d\n", status);
2554
2555                 Data = 0x24;
2556                 status = mos7840_set_reg_sync(serial->port[i],
2557                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2558                 if (status < 0) {
2559                         dbg("Writing DCR2 failed status-0x%x\n", status);
2560                         break;
2561                 } else
2562                         dbg("DCR2 Writing success status%d\n", status);
2563
2564                 /* write values in clkstart0x0 and clkmulti 0x20 */
2565                 Data = 0x0;
2566                 status = mos7840_set_reg_sync(serial->port[i],
2567                                          CLK_START_VALUE_REGISTER, Data);
2568                 if (status < 0) {
2569                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2570                         break;
2571                 } else
2572                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2573
2574                 Data = 0x20;
2575                 status = mos7840_set_reg_sync(serial->port[i],
2576                                         CLK_MULTI_REGISTER, Data);
2577                 if (status < 0) {
2578                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2579                             status);
2580                         goto error;
2581                 } else
2582                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2583                             status);
2584
2585                 /* write value 0x0 to scratchpad register */
2586                 Data = 0x00;
2587                 status = mos7840_set_uart_reg(serial->port[i],
2588                                                 SCRATCH_PAD_REGISTER, Data);
2589                 if (status < 0) {
2590                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2591                             status);
2592                         break;
2593                 } else
2594                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2595                             status);
2596
2597                 /* Zero Length flag register */
2598                 if ((mos7840_port->port_num != 1)
2599                     && (serial->num_ports == 2)) {
2600
2601                         Data = 0xff;
2602                         status = mos7840_set_reg_sync(serial->port[i],
2603                                       (__u16) (ZLP_REG1 +
2604                                       ((__u16)mos7840_port->port_num)), Data);
2605                         dbg("ZLIP offset%x\n",
2606                             (__u16) (ZLP_REG1 +
2607                                         ((__u16) mos7840_port->port_num)));
2608                         if (status < 0) {
2609                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2610                                     i + 2, status);
2611                                 break;
2612                         } else
2613                                 dbg("ZLP_REG%d Writing success status%d\n",
2614                                     i + 2, status);
2615                 } else {
2616                         Data = 0xff;
2617                         status = mos7840_set_reg_sync(serial->port[i],
2618                               (__u16) (ZLP_REG1 +
2619                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2620                         dbg("ZLIP offset%x\n",
2621                             (__u16) (ZLP_REG1 +
2622                                      ((__u16) mos7840_port->port_num) - 0x1));
2623                         if (status < 0) {
2624                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2625                                     i + 1, status);
2626                                 break;
2627                         } else
2628                                 dbg("ZLP_REG%d Writing success status%d\n",
2629                                     i + 1, status);
2630
2631                 }
2632                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2633                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2634                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2635                                                                 GFP_KERNEL);
2636                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2637                                                         !mos7840_port->dr) {
2638                         status = -ENOMEM;
2639                         goto error;
2640                 }
2641         }
2642
2643         /* Zero Length flag enable */
2644         Data = 0x0f;
2645         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2646         if (status < 0) {
2647                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2648                 goto error;
2649         } else
2650                 dbg("ZLP_REG5 Writing success status%d\n", status);
2651
2652         /* setting configuration feature to one */
2653         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2654                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2655         return 0;
2656 error:
2657         for (/* nothing */; i >= 0; i--) {
2658                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2659
2660                 kfree(mos7840_port->dr);
2661                 kfree(mos7840_port->ctrl_buf);
2662                 usb_free_urb(mos7840_port->control_urb);
2663                 kfree(mos7840_port);
2664                 serial->port[i] = NULL;
2665         }
2666         return status;
2667 }
2668
2669 /****************************************************************************
2670  * mos7840_shutdown
2671  *      This function is called whenever the device is removed from the usb bus.
2672  ****************************************************************************/
2673
2674 static void mos7840_shutdown(struct usb_serial *serial)
2675 {
2676         int i;
2677         unsigned long flags;
2678         struct moschip_port *mos7840_port;
2679         dbg("%s \n", " shutdown :entering..........");
2680
2681         if (!serial) {
2682                 dbg("%s", "Invalid Handler \n");
2683                 return;
2684         }
2685
2686         /* check for the ports to be closed,close the ports and disconnect */
2687
2688         /* free private structure allocated for serial port  *
2689          * stop reads and writes on all ports                */
2690
2691         for (i = 0; i < serial->num_ports; ++i) {
2692                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2693                 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2694                 mos7840_port->zombie = 1;
2695                 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2696                 usb_kill_urb(mos7840_port->control_urb);
2697                 kfree(mos7840_port->ctrl_buf);
2698                 kfree(mos7840_port->dr);
2699                 kfree(mos7840_port);
2700                 mos7840_set_port_private(serial->port[i], NULL);
2701         }
2702
2703         dbg("%s\n", "Thank u :: ");
2704
2705 }
2706
2707 static struct usb_driver io_driver = {
2708         .name = "mos7840",
2709         .probe = usb_serial_probe,
2710         .disconnect = usb_serial_disconnect,
2711         .id_table = moschip_id_table_combined,
2712         .no_dynamic_id = 1,
2713 };
2714
2715 static struct usb_serial_driver moschip7840_4port_device = {
2716         .driver = {
2717                    .owner = THIS_MODULE,
2718                    .name = "mos7840",
2719                    },
2720         .description = DRIVER_DESC,
2721         .usb_driver = &io_driver,
2722         .id_table = moschip_port_id_table,
2723         .num_ports = 4,
2724         .open = mos7840_open,
2725         .close = mos7840_close,
2726         .write = mos7840_write,
2727         .write_room = mos7840_write_room,
2728         .chars_in_buffer = mos7840_chars_in_buffer,
2729         .throttle = mos7840_throttle,
2730         .unthrottle = mos7840_unthrottle,
2731         .calc_num_ports = mos7840_calc_num_ports,
2732 #ifdef MCSSerialProbe
2733         .probe = mos7840_serial_probe,
2734 #endif
2735         .ioctl = mos7840_ioctl,
2736         .set_termios = mos7840_set_termios,
2737         .break_ctl = mos7840_break,
2738         .tiocmget = mos7840_tiocmget,
2739         .tiocmset = mos7840_tiocmset,
2740         .attach = mos7840_startup,
2741         .shutdown = mos7840_shutdown,
2742         .read_bulk_callback = mos7840_bulk_in_callback,
2743         .read_int_callback = mos7840_interrupt_callback,
2744 };
2745
2746 /****************************************************************************
2747  * moschip7840_init
2748  *      This is called by the module subsystem, or on startup to initialize us
2749  ****************************************************************************/
2750 static int __init moschip7840_init(void)
2751 {
2752         int retval;
2753
2754         dbg("%s \n", " mos7840_init :entering..........");
2755
2756         /* Register with the usb serial */
2757         retval = usb_serial_register(&moschip7840_4port_device);
2758
2759         if (retval)
2760                 goto failed_port_device_register;
2761
2762         dbg("%s\n", "Entring...");
2763         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2764                DRIVER_DESC "\n");
2765
2766         /* Register with the usb */
2767         retval = usb_register(&io_driver);
2768         if (retval == 0) {
2769                 dbg("%s\n", "Leaving...");
2770                 return 0;
2771         }
2772         usb_serial_deregister(&moschip7840_4port_device);
2773 failed_port_device_register:
2774         return retval;
2775 }
2776
2777 /****************************************************************************
2778  * moschip7840_exit
2779  *      Called when the driver is about to be unloaded.
2780  ****************************************************************************/
2781 static void __exit moschip7840_exit(void)
2782 {
2783
2784         dbg("%s \n", " mos7840_exit :entering..........");
2785
2786         usb_deregister(&io_driver);
2787
2788         usb_serial_deregister(&moschip7840_4port_device);
2789
2790         dbg("%s\n", "Entring...");
2791 }
2792
2793 module_init(moschip7840_init);
2794 module_exit(moschip7840_exit);
2795
2796 /* Module information */
2797 MODULE_DESCRIPTION(DRIVER_DESC);
2798 MODULE_LICENSE("GPL");
2799
2800 module_param(debug, bool, S_IRUGO | S_IWUSR);
2801 MODULE_PARM_DESC(debug, "Debug enabled or not");