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 "1.3.2"
  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 /* This driver also supports the ATEN UC2324 device since it is mos7840 based
 127  *  - if I knew the device id it would also support the ATEN UC2322 */
 128 #define USB_VENDOR_ID_ATENINTL          0x0557
 129 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 130
 131 /* Interrupt Routine Defines    */
 132
 133 #define SERIAL_IIR_RLS      0x06
 134 #define SERIAL_IIR_MS       0x00
 135
 136 /*
 137  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 138  */
 139 #define SERIAL_LSR_DR       0x0001
 140 #define SERIAL_LSR_OE       0x0002
 141 #define SERIAL_LSR_PE       0x0004
 142 #define SERIAL_LSR_FE       0x0008
 143 #define SERIAL_LSR_BI       0x0010
 144
 145 #define MOS_MSR_DELTA_CTS   0x10
 146 #define MOS_MSR_DELTA_DSR   0x20
 147 #define MOS_MSR_DELTA_RI    0x40
 148 #define MOS_MSR_DELTA_CD    0x80
 149
 150 /* Serial Port register Address */
 151 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 152 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 153 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 154 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 155 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 156 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 157 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 158 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 159 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 160
 161 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 162 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 163
 164 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 165
 166 /*
 167  * URB POOL related defines
 168  */
 169 #define NUM_URBS                        16      /* URB Count */
 170 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 171
 172
 173 static struct usb_device_id moschip_port_id_table[] = {
 174         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 175         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 176         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 177         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 178         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 179         {}                      /* terminating entry */
 180 };
 181
 182 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 183         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 184         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 185         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 186         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 187         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 188         {}                      /* terminating entry */
 189 };
 190
 191 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 192
 193 /* This structure holds all of the local port information */
 194
 195 struct moschip_port {
 196         int port_num;           /*Actual port number in the device(1,2,etc) */
 197         struct urb *write_urb;  /* write URB for this port */
 198         struct urb *read_urb;   /* read URB for this port */
 199         struct urb *int_urb;
 200         __u8 shadowLCR;         /* last LCR value received */
 201         __u8 shadowMCR;         /* last MCR value received */
 202         char open;
 203         char open_ports;
 204         char zombie;
 205         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 206         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 207         int delta_msr_cond;
 208         struct async_icount icount;
 209         struct usb_serial_port *port;   /* loop back to the owner of this object */
 210
 211         /* Offsets */
 212         __u8 SpRegOffset;
 213         __u8 ControlRegOffset;
 214         __u8 DcrRegOffset;
 215         /* for processing control URBS in interrupt context */
 216         struct urb *control_urb;
 217         struct usb_ctrlrequest *dr;
 218         char *ctrl_buf;
 219         int MsrLsr;
 220
 221         spinlock_t pool_lock;
 222         struct urb *write_urb_pool[NUM_URBS];
 223         char busy[NUM_URBS];
 224         bool read_urb_busy;
 225 };
 226
 227
 228 static int debug;
 229
 230 /*
 231  * mos7840_set_reg_sync
 232  *      To set the Control register by calling usb_fill_control_urb function
 233  *      by passing usb_sndctrlpipe function as parameter.
 234  */
 235
 236 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 237                                 __u16 val)
 238 {
 239         struct usb_device *dev = port->serial->dev;
 240         val = val & 0x00ff;
 241         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 242
 243         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 244                                MCS_WR_RTYPE, val, reg, NULL, 0,
 245                                MOS_WDR_TIMEOUT);
 246 }
 247
 248 /*
 249  * mos7840_get_reg_sync
 250  *      To set the Uart register by calling usb_fill_control_urb function by
 251  *      passing usb_rcvctrlpipe function as parameter.
 252  */
 253
 254 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 255                                 __u16 *val)
 256 {
 257         struct usb_device *dev = port->serial->dev;
 258         int ret = 0;
 259
 260         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 261                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 262                               MOS_WDR_TIMEOUT);
 263         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 264         *val = (*val) & 0x00ff;
 265         return ret;
 266 }
 267
 268 /*
 269  * mos7840_set_uart_reg
 270  *      To set the Uart register by calling usb_fill_control_urb function by
 271  *      passing usb_sndctrlpipe function as parameter.
 272  */
 273
 274 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 275                                 __u16 val)
 276 {
 277
 278         struct usb_device *dev = port->serial->dev;
 279         val = val & 0x00ff;
 280         /* For the UART control registers, the application number need
 281            to be Or'ed */
 282         if (port->serial->num_ports == 4) {
 283                 val |= (((__u16) port->number -
 284                                 (__u16) (port->serial->minor)) + 1) << 8;
 285                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 286         } else {
 287                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 288                         val |= (((__u16) port->number -
 289                               (__u16) (port->serial->minor)) + 1) << 8;
 290                         dbg("mos7840_set_uart_reg application number is %x\n",
 291                             val);
 292                 } else {
 293                         val |=
 294                             (((__u16) port->number -
 295                               (__u16) (port->serial->minor)) + 2) << 8;
 296                         dbg("mos7840_set_uart_reg application number is %x\n",
 297                             val);
 298                 }
 299         }
 300         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 301                                MCS_WR_RTYPE, val, reg, NULL, 0,
 302                                MOS_WDR_TIMEOUT);
 303
 304 }
 305
 306 /*
 307  * mos7840_get_uart_reg
 308  *      To set the Control register by calling usb_fill_control_urb function
 309  *      by passing usb_rcvctrlpipe function as parameter.
 310  */
 311 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 312                                 __u16 *val)
 313 {
 314         struct usb_device *dev = port->serial->dev;
 315         int ret = 0;
 316         __u16 Wval;
 317
 318         /* dbg("application number is %4x \n",
 319             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 320         /* Wval  is same as application number */
 321         if (port->serial->num_ports == 4) {
 322                 Wval =
 323                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 324                      1) << 8;
 325                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 326         } else {
 327                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 328                         Wval = (((__u16) port->number -
 329                               (__u16) (port->serial->minor)) + 1) << 8;
 330                         dbg("mos7840_get_uart_reg application number is %x\n",
 331                             Wval);
 332                 } else {
 333                         Wval = (((__u16) port->number -
 334                               (__u16) (port->serial->minor)) + 2) << 8;
 335                         dbg("mos7840_get_uart_reg application number is %x\n",
 336                             Wval);
 337                 }
 338         }
 339         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 340                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 341                               MOS_WDR_TIMEOUT);
 342         *val = (*val) & 0x00ff;
 343         return ret;
 344 }
 345
 346 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 347 {
 348
 349         dbg("***************************************\n");
 350         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 351         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 352         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 353         dbg("***************************************\n");
 354
 355 }
 356
 357 /************************************************************************/
 358 /************************************************************************/
 359 /*             I N T E R F A C E   F U N C T I O N S                    */
 360 /*             I N T E R F A C E   F U N C T I O N S                    */
 361 /************************************************************************/
 362 /************************************************************************/
 363
 364 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 365                                             struct moschip_port *data)
 366 {
 367         usb_set_serial_port_data(port, (void *)data);
 368 }
 369
 370 static inline struct moschip_port *mos7840_get_port_private(struct
 371                                                             usb_serial_port
 372                                                             *port)
 373 {
 374         return (struct moschip_port *)usb_get_serial_port_data(port);
 375 }
 376
 377 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 378 {
 379         struct moschip_port *mos7840_port;
 380         struct async_icount *icount;
 381         mos7840_port = port;
 382         icount = &mos7840_port->icount;
 383         if (new_msr &
 384             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 385              MOS_MSR_DELTA_CD)) {
 386                 icount = &mos7840_port->icount;
 387
 388                 /* update input line counters */
 389                 if (new_msr & MOS_MSR_DELTA_CTS) {
 390                         icount->cts++;
 391                         smp_wmb();
 392                 }
 393                 if (new_msr & MOS_MSR_DELTA_DSR) {
 394                         icount->dsr++;
 395                         smp_wmb();
 396                 }
 397                 if (new_msr & MOS_MSR_DELTA_CD) {
 398                         icount->dcd++;
 399                         smp_wmb();
 400                 }
 401                 if (new_msr & MOS_MSR_DELTA_RI) {
 402                         icount->rng++;
 403                         smp_wmb();
 404                 }
 405         }
 406 }
 407
 408 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 409 {
 410         struct async_icount *icount;
 411
 412         dbg("%s - %02x", __func__, new_lsr);
 413
 414         if (new_lsr & SERIAL_LSR_BI) {
 415                 /*
 416                  * Parity and Framing errors only count if they
 417                  * occur exclusive of a break being
 418                  * received.
 419                  */
 420                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 421         }
 422
 423         /* update input line counters */
 424         icount = &port->icount;
 425         if (new_lsr & SERIAL_LSR_BI) {
 426                 icount->brk++;
 427                 smp_wmb();
 428         }
 429         if (new_lsr & SERIAL_LSR_OE) {
 430                 icount->overrun++;
 431                 smp_wmb();
 432         }
 433         if (new_lsr & SERIAL_LSR_PE) {
 434                 icount->parity++;
 435                 smp_wmb();
 436         }
 437         if (new_lsr & SERIAL_LSR_FE) {
 438                 icount->frame++;
 439                 smp_wmb();
 440         }
 441 }
 442
 443 /************************************************************************/
 444 /************************************************************************/
 445 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 446 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 447 /************************************************************************/
 448 /************************************************************************/
 449
 450 static void mos7840_control_callback(struct urb *urb)
 451 {
 452         unsigned char *data;
 453         struct moschip_port *mos7840_port;
 454         __u8 regval = 0x0;
 455         int result = 0;
 456         int status = urb->status;
 457
 458         mos7840_port = urb->context;
 459
 460         switch (status) {
 461         case 0:
 462                 /* success */
 463                 break;
 464         case -ECONNRESET:
 465         case -ENOENT:
 466         case -ESHUTDOWN:
 467                 /* this urb is terminated, clean up */
 468                 dbg("%s - urb shutting down with status: %d", __func__,
 469                     status);
 470                 return;
 471         default:
 472                 dbg("%s - nonzero urb status received: %d", __func__,
 473                     status);
 474                 goto exit;
 475         }
 476
 477         dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
 478         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 479             mos7840_port->MsrLsr, mos7840_port->port_num);
 480         data = urb->transfer_buffer;
 481         regval = (__u8) data[0];
 482         dbg("%s data is %x\n", __func__, regval);
 483         if (mos7840_port->MsrLsr == 0)
 484                 mos7840_handle_new_msr(mos7840_port, regval);
 485         else if (mos7840_port->MsrLsr == 1)
 486                 mos7840_handle_new_lsr(mos7840_port, regval);
 487
 488 exit:
 489         spin_lock(&mos7840_port->pool_lock);
 490         if (!mos7840_port->zombie)
 491                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 492         spin_unlock(&mos7840_port->pool_lock);
 493         if (result) {
 494                 dev_err(&urb->dev->dev,
 495                         "%s - Error %d submitting interrupt urb\n",
 496                         __func__, result);
 497         }
 498 }
 499
 500 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 501                            __u16 *val)
 502 {
 503         struct usb_device *dev = mcs->port->serial->dev;
 504         struct usb_ctrlrequest *dr = mcs->dr;
 505         unsigned char *buffer = mcs->ctrl_buf;
 506         int ret;
 507
 508         dr->bRequestType = MCS_RD_RTYPE;
 509         dr->bRequest = MCS_RDREQ;
 510         dr->wValue = cpu_to_le16(Wval); /* 0 */
 511         dr->wIndex = cpu_to_le16(reg);
 512         dr->wLength = cpu_to_le16(2);
 513
 514         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 515                              (unsigned char *)dr, buffer, 2,
 516                              mos7840_control_callback, mcs);
 517         mcs->control_urb->transfer_buffer_length = 2;
 518         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 519         return ret;
 520 }
 521
 522 /*****************************************************************************
 523  * mos7840_interrupt_callback
 524  *      this is the callback function for when we have received data on the
 525  *      interrupt endpoint.
 526  *****************************************************************************/
 527
 528 static void mos7840_interrupt_callback(struct urb *urb)
 529 {
 530         int result;
 531         int length;
 532         struct moschip_port *mos7840_port;
 533         struct usb_serial *serial;
 534         __u16 Data;
 535         unsigned char *data;
 536         __u8 sp[5], st;
 537         int i, rv = 0;
 538         __u16 wval, wreg = 0;
 539         int status = urb->status;
 540
 541         dbg("%s", " : Entering\n");
 542
 543         switch (status) {
 544         case 0:
 545                 /* success */
 546                 break;
 547         case -ECONNRESET:
 548         case -ENOENT:
 549         case -ESHUTDOWN:
 550                 /* this urb is terminated, clean up */
 551                 dbg("%s - urb shutting down with status: %d", __func__,
 552                     status);
 553                 return;
 554         default:
 555                 dbg("%s - nonzero urb status received: %d", __func__,
 556                     status);
 557                 goto exit;
 558         }
 559
 560         length = urb->actual_length;
 561         data = urb->transfer_buffer;
 562
 563         serial = urb->context;
 564
 565         /* Moschip get 5 bytes
 566          * Byte 1 IIR Port 1 (port.number is 0)
 567          * Byte 2 IIR Port 2 (port.number is 1)
 568          * Byte 3 IIR Port 3 (port.number is 2)
 569          * Byte 4 IIR Port 4 (port.number is 3)
 570          * Byte 5 FIFO status for both */
 571
 572         if (length && length > 5) {
 573                 dbg("%s \n", "Wrong data !!!");
 574                 return;
 575         }
 576
 577         sp[0] = (__u8) data[0];
 578         sp[1] = (__u8) data[1];
 579         sp[2] = (__u8) data[2];
 580         sp[3] = (__u8) data[3];
 581         st = (__u8) data[4];
 582
 583         for (i = 0; i < serial->num_ports; i++) {
 584                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 585                 wval =
 586                     (((__u16) serial->port[i]->number -
 587                       (__u16) (serial->minor)) + 1) << 8;
 588                 if (mos7840_port->open) {
 589                         if (sp[i] & 0x01) {
 590                                 dbg("SP%d No Interrupt !!!\n", i);
 591                         } else {
 592                                 switch (sp[i] & 0x0f) {
 593                                 case SERIAL_IIR_RLS:
 594                                         dbg("Serial Port %d: Receiver status error or ", i);
 595                                         dbg("address bit detected in 9-bit mode\n");
 596                                         mos7840_port->MsrLsr = 1;
 597                                         wreg = LINE_STATUS_REGISTER;
 598                                         break;
 599                                 case SERIAL_IIR_MS:
 600                                         dbg("Serial Port %d: Modem status change\n", i);
 601                                         mos7840_port->MsrLsr = 0;
 602                                         wreg = MODEM_STATUS_REGISTER;
 603                                         break;
 604                                 }
 605                                 spin_lock(&mos7840_port->pool_lock);
 606                                 if (!mos7840_port->zombie) {
 607                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 608                                 } else {
 609                                         spin_unlock(&mos7840_port->pool_lock);
 610                                         return;
 611                                 }
 612                                 spin_unlock(&mos7840_port->pool_lock);
 613                         }
 614                 }
 615         }
 616         if (!(rv < 0))
 617                 /* the completion handler for the control urb will resubmit */
 618                 return;
 619 exit:
 620         result = usb_submit_urb(urb, GFP_ATOMIC);
 621         if (result) {
 622                 dev_err(&urb->dev->dev,
 623                         "%s - Error %d submitting interrupt urb\n",
 624                         __func__, result);
 625         }
 626 }
 627
 628 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 629                                        const char *function)
 630 {
 631         if (!port) {
 632                 dbg("%s - port == NULL", function);
 633                 return -1;
 634         }
 635         if (!port->serial) {
 636                 dbg("%s - port->serial == NULL", function);
 637                 return -1;
 638         }
 639
 640         return 0;
 641 }
 642
 643 /* Inline functions to check the sanity of a pointer that is passed to us */
 644 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 645                                          const char *function)
 646 {
 647         if (!serial) {
 648                 dbg("%s - serial == NULL", function);
 649                 return -1;
 650         }
 651         if (!serial->type) {
 652                 dbg("%s - serial->type == NULL!", function);
 653                 return -1;
 654         }
 655
 656         return 0;
 657 }
 658
 659 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 660                                                  const char *function)
 661 {
 662         /* if no port was specified, or it fails a paranoia check */
 663         if (!port ||
 664             mos7840_port_paranoia_check(port, function) ||
 665             mos7840_serial_paranoia_check(port->serial, function)) {
 666                 /* then say that we don't have a valid usb_serial thing,
 667                  * which will end up genrating -ENODEV return values */
 668                 return NULL;
 669         }
 670
 671         return port->serial;
 672 }
 673
 674 /*****************************************************************************
 675  * mos7840_bulk_in_callback
 676  *      this is the callback function for when we have received data on the
 677  *      bulk in endpoint.
 678  *****************************************************************************/
 679
 680 static void mos7840_bulk_in_callback(struct urb *urb)
 681 {
 682         int retval;
 683         unsigned char *data;
 684         struct usb_serial *serial;
 685         struct usb_serial_port *port;
 686         struct moschip_port *mos7840_port;
 687         struct tty_struct *tty;
 688         int status = urb->status;
 689
 690         mos7840_port = urb->context;
 691         if (!mos7840_port) {
 692                 dbg("%s", "NULL mos7840_port pointer \n");
 693                 mos7840_port->read_urb_busy = false;
 694                 return;
 695         }
 696
 697         if (status) {
 698                 dbg("nonzero read bulk status received: %d", status);
 699                 mos7840_port->read_urb_busy = false;
 700                 return;
 701         }
 702
 703         port = (struct usb_serial_port *)mos7840_port->port;
 704         if (mos7840_port_paranoia_check(port, __func__)) {
 705                 dbg("%s", "Port Paranoia failed \n");
 706                 mos7840_port->read_urb_busy = false;
 707                 return;
 708         }
 709
 710         serial = mos7840_get_usb_serial(port, __func__);
 711         if (!serial) {
 712                 dbg("%s\n", "Bad serial pointer ");
 713                 mos7840_port->read_urb_busy = false;
 714                 return;
 715         }
 716
 717         dbg("%s\n", "Entering... \n");
 718
 719         data = urb->transfer_buffer;
 720
 721         dbg("%s", "Entering ........... \n");
 722
 723         if (urb->actual_length) {
 724                 tty = tty_port_tty_get(&mos7840_port->port->port);
 725                 if (tty) {
 726                         tty_buffer_request_room(tty, urb->actual_length);
 727                         tty_insert_flip_string(tty, data, urb->actual_length);
 728                         dbg(" %s \n", data);
 729                         tty_flip_buffer_push(tty);
 730                         tty_kref_put(tty);
 731                 }
 732                 mos7840_port->icount.rx += urb->actual_length;
 733                 smp_wmb();
 734                 dbg("mos7840_port->icount.rx is %d:\n",
 735                     mos7840_port->icount.rx);
 736         }
 737
 738         if (!mos7840_port->read_urb) {
 739                 dbg("%s", "URB KILLED !!!\n");
 740                 mos7840_port->read_urb_busy = false;
 741                 return;
 742         }
 743
 744
 745         mos7840_port->read_urb->dev = serial->dev;
 746
 747         mos7840_port->read_urb_busy = true;
 748         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 749
 750         if (retval) {
 751                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 752                 mos7840_port->read_urb_busy = false;
 753         }
 754 }
 755
 756 /*****************************************************************************
 757  * mos7840_bulk_out_data_callback
 758  *      this is the callback function for when we have finished sending
 759  *      serial data on the bulk out endpoint.
 760  *****************************************************************************/
 761
 762 static void mos7840_bulk_out_data_callback(struct urb *urb)
 763 {
 764         struct moschip_port *mos7840_port;
 765         struct tty_struct *tty;
 766         int status = urb->status;
 767         int i;
 768
 769         mos7840_port = urb->context;
 770         spin_lock(&mos7840_port->pool_lock);
 771         for (i = 0; i < NUM_URBS; i++) {
 772                 if (urb == mos7840_port->write_urb_pool[i]) {
 773                         mos7840_port->busy[i] = 0;
 774                         break;
 775                 }
 776         }
 777         spin_unlock(&mos7840_port->pool_lock);
 778
 779         if (status) {
 780                 dbg("nonzero write bulk status received:%d\n", status);
 781                 return;
 782         }
 783
 784         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 785                 dbg("%s", "Port Paranoia failed \n");
 786                 return;
 787         }
 788
 789         dbg("%s \n", "Entering .........");
 790
 791         tty = tty_port_tty_get(&mos7840_port->port->port);
 792         if (tty && mos7840_port->open)
 793                 tty_wakeup(tty);
 794         tty_kref_put(tty);
 795
 796 }
 797
 798 /************************************************************************/
 799 /*       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       */
 800 /************************************************************************/
 801 #ifdef MCSSerialProbe
 802 static int mos7840_serial_probe(struct usb_serial *serial,
 803                                 const struct usb_device_id *id)
 804 {
 805
 806         /*need to implement the mode_reg reading and updating\
 807            structures usb_serial_ device_type\
 808            (i.e num_ports, num_bulkin,bulkout etc) */
 809         /* Also we can update the changes  attach */
 810         return 1;
 811 }
 812 #endif
 813
 814 /*****************************************************************************
 815  * mos7840_open
 816  *      this function is called by the tty driver when a port is opened
 817  *      If successful, we return 0
 818  *      Otherwise we return a negative error number.
 819  *****************************************************************************/
 820
 821 static int mos7840_open(struct tty_struct *tty,
 822                         struct usb_serial_port *port, struct file *filp)
 823 {
 824         int response;
 825         int j;
 826         struct usb_serial *serial;
 827         struct urb *urb;
 828         __u16 Data;
 829         int status;
 830         struct moschip_port *mos7840_port;
 831         struct moschip_port *port0;
 832
 833         if (mos7840_port_paranoia_check(port, __func__)) {
 834                 dbg("%s", "Port Paranoia failed \n");
 835                 return -ENODEV;
 836         }
 837
 838         serial = port->serial;
 839
 840         if (mos7840_serial_paranoia_check(serial, __func__)) {
 841                 dbg("%s", "Serial Paranoia failed \n");
 842                 return -ENODEV;
 843         }
 844
 845         mos7840_port = mos7840_get_port_private(port);
 846         port0 = mos7840_get_port_private(serial->port[0]);
 847
 848         if (mos7840_port == NULL || port0 == NULL)
 849                 return -ENODEV;
 850
 851         usb_clear_halt(serial->dev, port->write_urb->pipe);
 852         usb_clear_halt(serial->dev, port->read_urb->pipe);
 853         port0->open_ports++;
 854
 855         /* Initialising the write urb pool */
 856         for (j = 0; j < NUM_URBS; ++j) {
 857                 urb = usb_alloc_urb(0, GFP_KERNEL);
 858                 mos7840_port->write_urb_pool[j] = urb;
 859
 860                 if (urb == NULL) {
 861                         dev_err(&port->dev, "No more urbs???\n");
 862                         continue;
 863                 }
 864
 865                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 866                                                                 GFP_KERNEL);
 867                 if (!urb->transfer_buffer) {
 868                         usb_free_urb(urb);
 869                         mos7840_port->write_urb_pool[j] = NULL;
 870                         dev_err(&port->dev,
 871                                 "%s-out of memory for urb buffers.\n",
 872                                 __func__);
 873                         continue;
 874                 }
 875         }
 876
 877 /*****************************************************************************
 878  * Initialize MCS7840 -- Write Init values to corresponding Registers
 879  *
 880  * Register Index
 881  * 1 : IER
 882  * 2 : FCR
 883  * 3 : LCR
 884  * 4 : MCR
 885  *
 886  * 0x08 : SP1/2 Control Reg
 887  *****************************************************************************/
 888
 889         /* NEED to check the following Block */
 890
 891         Data = 0x0;
 892         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 893         if (status < 0) {
 894                 dbg("Reading Spreg failed\n");
 895                 return -1;
 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
 904         Data &= ~0x80;
 905         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 906         if (status < 0) {
 907                 dbg("writing Spreg failed\n");
 908                 return -1;
 909         }
 910         /* End of block to be checked */
 911
 912         Data = 0x0;
 913         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 914                                                                         &Data);
 915         if (status < 0) {
 916                 dbg("Reading Controlreg failed\n");
 917                 return -1;
 918         }
 919         Data |= 0x08;           /* Driver done bit */
 920         Data |= 0x20;           /* rx_disable */
 921         status = mos7840_set_reg_sync(port,
 922                                 mos7840_port->ControlRegOffset, Data);
 923         if (status < 0) {
 924                 dbg("writing Controlreg failed\n");
 925                 return -1;
 926         }
 927         /* do register settings here */
 928         /* Set all regs to the device default values. */
 929         /***********************************
 930          * First Disable all interrupts.
 931          ***********************************/
 932         Data = 0x00;
 933         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 934         if (status < 0) {
 935                 dbg("disableing interrupts failed\n");
 936                 return -1;
 937         }
 938         /* Set FIFO_CONTROL_REGISTER to the default value */
 939         Data = 0x00;
 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 = 0xcf;
 947         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 948         if (status < 0) {
 949                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 950                 return -1;
 951         }
 952
 953         Data = 0x03;
 954         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 955         mos7840_port->shadowLCR = Data;
 956
 957         Data = 0x0b;
 958         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 959         mos7840_port->shadowMCR = Data;
 960
 961         Data = 0x00;
 962         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 963         mos7840_port->shadowLCR = Data;
 964
 965         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 966         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 967
 968         Data = 0x0c;
 969         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 970
 971         Data = 0x0;
 972         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 973
 974         Data = 0x00;
 975         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 976
 977         Data = Data & ~SERIAL_LCR_DLAB;
 978         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 979         mos7840_port->shadowLCR = Data;
 980
 981         /* clearing Bulkin and Bulkout Fifo */
 982         Data = 0x0;
 983         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 984
 985         Data = Data | 0x0c;
 986         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 987
 988         Data = Data & ~0x0c;
 989         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 990         /* Finally enable all interrupts */
 991         Data = 0x0c;
 992         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 993
 994         /* clearing rx_disable */
 995         Data = 0x0;
 996         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 997                                                                         &Data);
 998         Data = Data & ~0x20;
 999         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1000                                                                         Data);
1001
1002         /* rx_negate */
1003         Data = 0x0;
1004         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1005                                                                         &Data);
1006         Data = Data | 0x10;
1007         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1008                                                                         Data);
1009
1010         /* Check to see if we've set up our endpoint info yet    *
1011          * (can't set it up in mos7840_startup as the structures *
1012          * were not set up at that time.)                        */
1013         if (port0->open_ports == 1) {
1014                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1015                         /* set up interrupt urb */
1016                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1017                                 serial->dev,
1018                                 usb_rcvintpipe(serial->dev,
1019                                 serial->port[0]->interrupt_in_endpointAddress),
1020                                 serial->port[0]->interrupt_in_buffer,
1021                                 serial->port[0]->interrupt_in_urb->
1022                                 transfer_buffer_length,
1023                                 mos7840_interrupt_callback,
1024                                 serial,
1025                                 serial->port[0]->interrupt_in_urb->interval);
1026
1027                         /* start interrupt read for mos7840               *
1028                          * will continue as long as mos7840 is connected  */
1029
1030                         response =
1031                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1032                                            GFP_KERNEL);
1033                         if (response) {
1034                                 dev_err(&port->dev, "%s - Error %d submitting "
1035                                         "interrupt urb\n", __func__, response);
1036                         }
1037
1038                 }
1039
1040         }
1041
1042         /* see if we've set up our endpoint info yet   *
1043          * (can't set it up in mos7840_startup as the  *
1044          * structures were not set up at that time.)   */
1045
1046         dbg("port number is %d \n", port->number);
1047         dbg("serial number is %d \n", port->serial->minor);
1048         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1049         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1050         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1051         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1052         mos7840_port->read_urb = port->read_urb;
1053
1054         /* set up our bulk in urb */
1055
1056         usb_fill_bulk_urb(mos7840_port->read_urb,
1057                           serial->dev,
1058                           usb_rcvbulkpipe(serial->dev,
1059                                           port->bulk_in_endpointAddress),
1060                           port->bulk_in_buffer,
1061                           mos7840_port->read_urb->transfer_buffer_length,
1062                           mos7840_bulk_in_callback, mos7840_port);
1063
1064         dbg("mos7840_open: bulkin endpoint is %d\n",
1065             port->bulk_in_endpointAddress);
1066         mos7840_port->read_urb_busy = true;
1067         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1068         if (response) {
1069                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1070                         __func__, response);
1071                 mos7840_port->read_urb_busy = false;
1072         }
1073
1074         /* initialize our wait queues */
1075         init_waitqueue_head(&mos7840_port->wait_chase);
1076         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1077
1078         /* initialize our icount structure */
1079         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1080
1081         /* initialize our port settings */
1082         /* Must set to enable ints! */
1083         mos7840_port->shadowMCR = MCR_MASTER_IE;
1084         /* send a open port command */
1085         mos7840_port->open = 1;
1086         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1087         mos7840_port->icount.tx = 0;
1088         mos7840_port->icount.rx = 0;
1089
1090         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n",
1091                                 serial, mos7840_port, port);
1092
1093         return 0;
1094
1095 }
1096
1097 /*****************************************************************************
1098  * mos7840_chars_in_buffer
1099  *      this function is called by the tty driver when it wants to know how many
1100  *      bytes of data we currently have outstanding in the port (data that has
1101  *      been written, but hasn't made it out the port yet)
1102  *      If successful, we return the number of bytes left to be written in the
1103  *      system,
1104  *      Otherwise we return zero.
1105  *****************************************************************************/
1106
1107 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1108 {
1109         struct usb_serial_port *port = tty->driver_data;
1110         int i;
1111         int chars = 0;
1112         unsigned long flags;
1113         struct moschip_port *mos7840_port;
1114
1115         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1116
1117         if (mos7840_port_paranoia_check(port, __func__)) {
1118                 dbg("%s", "Invalid port \n");
1119                 return 0;
1120         }
1121
1122         mos7840_port = mos7840_get_port_private(port);
1123         if (mos7840_port == NULL) {
1124                 dbg("%s \n", "mos7840_break:leaving ...........");
1125                 return 0;
1126         }
1127
1128         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1129         for (i = 0; i < NUM_URBS; ++i)
1130                 if (mos7840_port->busy[i])
1131                         chars += URB_TRANSFER_BUFFER_SIZE;
1132         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1133         dbg("%s - returns %d", __func__, chars);
1134         return chars;
1135
1136 }
1137
1138 /************************************************************************
1139  *
1140  * mos7840_block_until_tx_empty
1141  *
1142  *      This function will block the close until one of the following:
1143  *              1. TX count are 0
1144  *              2. The mos7840 has stopped
1145  *              3. A timeout of 3 seconds without activity has expired
1146  *
1147  ************************************************************************/
1148 static void mos7840_block_until_tx_empty(struct tty_struct *tty,
1149                                 struct moschip_port *mos7840_port)
1150 {
1151         int timeout = HZ / 10;
1152         int wait = 30;
1153         int count;
1154
1155         while (1) {
1156
1157                 count = mos7840_chars_in_buffer(tty);
1158
1159                 /* Check for Buffer status */
1160                 if (count <= 0)
1161                         return;
1162
1163                 /* Block the thread for a while */
1164                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1165                                                timeout);
1166
1167                 /* No activity.. count down section */
1168                 wait--;
1169                 if (wait == 0) {
1170                         dbg("%s - TIMEOUT", __func__);
1171                         return;
1172                 } else {
1173                         /* Reset timeout value back to seconds */
1174                         wait = 30;
1175                 }
1176         }
1177 }
1178
1179 /*****************************************************************************
1180  * mos7840_close
1181  *      this function is called by the tty driver when a port is closed
1182  *****************************************************************************/
1183
1184 static void mos7840_close(struct tty_struct *tty,
1185                         struct usb_serial_port *port, struct file *filp)
1186 {
1187         struct usb_serial *serial;
1188         struct moschip_port *mos7840_port;
1189         struct moschip_port *port0;
1190         int j;
1191         __u16 Data;
1192
1193         dbg("%s\n", "mos7840_close:entering...");
1194
1195         if (mos7840_port_paranoia_check(port, __func__)) {
1196                 dbg("%s", "Port Paranoia failed \n");
1197                 return;
1198         }
1199
1200         serial = mos7840_get_usb_serial(port, __func__);
1201         if (!serial) {
1202                 dbg("%s", "Serial Paranoia failed \n");
1203                 return;
1204         }
1205
1206         mos7840_port = mos7840_get_port_private(port);
1207         port0 = mos7840_get_port_private(serial->port[0]);
1208
1209         if (mos7840_port == NULL || port0 == NULL)
1210                 return;
1211
1212         for (j = 0; j < NUM_URBS; ++j)
1213                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1214
1215         /* Freeing Write URBs */
1216         for (j = 0; j < NUM_URBS; ++j) {
1217                 if (mos7840_port->write_urb_pool[j]) {
1218                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1219                                 kfree(mos7840_port->write_urb_pool[j]->
1220                                       transfer_buffer);
1221
1222                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1223                 }
1224         }
1225
1226         if (serial->dev)
1227                 /* flush and block until tx is empty */
1228                 mos7840_block_until_tx_empty(tty, mos7840_port);
1229
1230         /* While closing port, shutdown all bulk read, write  *
1231          * and interrupt read if they exists                  */
1232         if (serial->dev) {
1233                 if (mos7840_port->write_urb) {
1234                         dbg("%s", "Shutdown bulk write\n");
1235                         usb_kill_urb(mos7840_port->write_urb);
1236                 }
1237                 if (mos7840_port->read_urb) {
1238                         dbg("%s", "Shutdown bulk read\n");
1239                         usb_kill_urb(mos7840_port->read_urb);
1240                         mos7840_port->read_urb_busy = false;
1241                 }
1242                 if ((&mos7840_port->control_urb)) {
1243                         dbg("%s", "Shutdown control read\n");
1244                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1245                 }
1246         }
1247 /*      if(mos7840_port->ctrl_buf != NULL) */
1248 /*              kfree(mos7840_port->ctrl_buf); */
1249         port0->open_ports--;
1250         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1251             port0->open_ports, port->number);
1252         if (port0->open_ports == 0) {
1253                 if (serial->port[0]->interrupt_in_urb) {
1254                         dbg("%s", "Shutdown interrupt_in_urb\n");
1255                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1256                 }
1257         }
1258
1259         if (mos7840_port->write_urb) {
1260                 /* if this urb had a transfer buffer already (old tx) free it */
1261                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1262                         kfree(mos7840_port->write_urb->transfer_buffer);
1263                 usb_free_urb(mos7840_port->write_urb);
1264         }
1265
1266         Data = 0x0;
1267         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1268
1269         Data = 0x00;
1270         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1271
1272         mos7840_port->open = 0;
1273
1274         dbg("%s \n", "Leaving ............");
1275 }
1276
1277 /************************************************************************
1278  *
1279  * mos7840_block_until_chase_response
1280  *
1281  *      This function will block the close until one of the following:
1282  *              1. Response to our Chase comes from mos7840
1283  *              2. A timeout of 10 seconds without activity has expired
1284  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1285  *
1286  ************************************************************************/
1287
1288 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1289                                         struct moschip_port *mos7840_port)
1290 {
1291         int timeout = 1 * HZ;
1292         int wait = 10;
1293         int count;
1294
1295         while (1) {
1296                 count = mos7840_chars_in_buffer(tty);
1297
1298                 /* Check for Buffer status */
1299                 if (count <= 0)
1300                         return;
1301
1302                 /* Block the thread for a while */
1303                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1304                                                timeout);
1305                 /* No activity.. count down section */
1306                 wait--;
1307                 if (wait == 0) {
1308                         dbg("%s - TIMEOUT", __func__);
1309                         return;
1310                 } else {
1311                         /* Reset timeout value back to seconds */
1312                         wait = 10;
1313                 }
1314         }
1315
1316 }
1317
1318 /*****************************************************************************
1319  * mos7840_break
1320  *      this function sends a break to the port
1321  *****************************************************************************/
1322 static void mos7840_break(struct tty_struct *tty, int break_state)
1323 {
1324         struct usb_serial_port *port = tty->driver_data;
1325         unsigned char data;
1326         struct usb_serial *serial;
1327         struct moschip_port *mos7840_port;
1328
1329         dbg("%s \n", "Entering ...........");
1330         dbg("mos7840_break: Start\n");
1331
1332         if (mos7840_port_paranoia_check(port, __func__)) {
1333                 dbg("%s", "Port Paranoia failed \n");
1334                 return;
1335         }
1336
1337         serial = mos7840_get_usb_serial(port, __func__);
1338         if (!serial) {
1339                 dbg("%s", "Serial Paranoia failed \n");
1340                 return;
1341         }
1342
1343         mos7840_port = mos7840_get_port_private(port);
1344
1345         if (mos7840_port == NULL)
1346                 return;
1347
1348         if (serial->dev)
1349                 /* flush and block until tx is empty */
1350                 mos7840_block_until_chase_response(tty, mos7840_port);
1351
1352         if (break_state == -1)
1353                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1354         else
1355                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1356
1357         /* FIXME: no locking on shadowLCR anywhere in driver */
1358         mos7840_port->shadowLCR = data;
1359         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1360             mos7840_port->shadowLCR);
1361         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1362                              mos7840_port->shadowLCR);
1363
1364         return;
1365 }
1366
1367 /*****************************************************************************
1368  * mos7840_write_room
1369  *      this function is called by the tty driver when it wants to know how many
1370  *      bytes of data we can accept for a specific port.
1371  *      If successful, we return the amount of room that we have for this port
1372  *      Otherwise we return a negative error number.
1373  *****************************************************************************/
1374
1375 static int mos7840_write_room(struct tty_struct *tty)
1376 {
1377         struct usb_serial_port *port = tty->driver_data;
1378         int i;
1379         int room = 0;
1380         unsigned long flags;
1381         struct moschip_port *mos7840_port;
1382
1383         dbg("%s \n", " mos7840_write_room:entering ...........");
1384
1385         if (mos7840_port_paranoia_check(port, __func__)) {
1386                 dbg("%s", "Invalid port \n");
1387                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1388                 return -1;
1389         }
1390
1391         mos7840_port = mos7840_get_port_private(port);
1392         if (mos7840_port == NULL) {
1393                 dbg("%s \n", "mos7840_break:leaving ...........");
1394                 return -1;
1395         }
1396
1397         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1398         for (i = 0; i < NUM_URBS; ++i) {
1399                 if (!mos7840_port->busy[i])
1400                         room += URB_TRANSFER_BUFFER_SIZE;
1401         }
1402         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1403
1404         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1405         dbg("%s - returns %d", __func__, room);
1406         return room;
1407
1408 }
1409
1410 /*****************************************************************************
1411  * mos7840_write
1412  *      this function is called by the tty driver when data should be written to
1413  *      the port.
1414  *      If successful, we return the number of bytes written, otherwise we
1415  *      return a negative error number.
1416  *****************************************************************************/
1417
1418 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1419                          const unsigned char *data, int count)
1420 {
1421         int status;
1422         int i;
1423         int bytes_sent = 0;
1424         int transfer_size;
1425         unsigned long flags;
1426
1427         struct moschip_port *mos7840_port;
1428         struct usb_serial *serial;
1429         struct urb *urb;
1430         /* __u16 Data; */
1431         const unsigned char *current_position = data;
1432         unsigned char *data1;
1433         dbg("%s \n", "entering ...........");
1434         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1435                                         mos7840_port->shadowLCR); */
1436
1437 #ifdef NOTMOS7840
1438         Data = 0x00;
1439         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1440         mos7840_port->shadowLCR = Data;
1441         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1442         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1443             mos7840_port->shadowLCR);
1444
1445         /* Data = 0x03; */
1446         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1447         /* mos7840_port->shadowLCR=Data;//Need to add later */
1448
1449         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1450         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1451
1452         /* Data = 0x0c; */
1453         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1454         Data = 0x00;
1455         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1456         dbg("mos7840_write:DLL value is %x\n", Data);
1457
1458         Data = 0x0;
1459         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1460         dbg("mos7840_write:DLM value is %x\n", Data);
1461
1462         Data = Data & ~SERIAL_LCR_DLAB;
1463         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1464             mos7840_port->shadowLCR);
1465         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1466 #endif
1467
1468         if (mos7840_port_paranoia_check(port, __func__)) {
1469                 dbg("%s", "Port Paranoia failed \n");
1470                 return -1;
1471         }
1472
1473         serial = port->serial;
1474         if (mos7840_serial_paranoia_check(serial, __func__)) {
1475                 dbg("%s", "Serial Paranoia failed \n");
1476                 return -1;
1477         }
1478
1479         mos7840_port = mos7840_get_port_private(port);
1480         if (mos7840_port == NULL) {
1481                 dbg("%s", "mos7840_port is NULL\n");
1482                 return -1;
1483         }
1484
1485         /* try to find a free urb in the list */
1486         urb = NULL;
1487
1488         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1489         for (i = 0; i < NUM_URBS; ++i) {
1490                 if (!mos7840_port->busy[i]) {
1491                         mos7840_port->busy[i] = 1;
1492                         urb = mos7840_port->write_urb_pool[i];
1493                         dbg("\nURB:%d", i);
1494                         break;
1495                 }
1496         }
1497         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1498
1499         if (urb == NULL) {
1500                 dbg("%s - no more free urbs", __func__);
1501                 goto exit;
1502         }
1503
1504         if (urb->transfer_buffer == NULL) {
1505                 urb->transfer_buffer =
1506                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1507
1508                 if (urb->transfer_buffer == NULL) {
1509                         dev_err(&port->dev, "%s no more kernel memory...\n",
1510                                 __func__);
1511                         goto exit;
1512                 }
1513         }
1514         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1515
1516         memcpy(urb->transfer_buffer, current_position, transfer_size);
1517
1518         /* fill urb with data and submit  */
1519         usb_fill_bulk_urb(urb,
1520                           serial->dev,
1521                           usb_sndbulkpipe(serial->dev,
1522                                           port->bulk_out_endpointAddress),
1523                           urb->transfer_buffer,
1524                           transfer_size,
1525                           mos7840_bulk_out_data_callback, mos7840_port);
1526
1527         data1 = urb->transfer_buffer;
1528         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1529
1530         /* send it down the pipe */
1531         status = usb_submit_urb(urb, GFP_ATOMIC);
1532
1533         if (status) {
1534                 mos7840_port->busy[i] = 0;
1535                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1536                         "with status = %d\n", __func__, status);
1537                 bytes_sent = status;
1538                 goto exit;
1539         }
1540         bytes_sent = transfer_size;
1541         mos7840_port->icount.tx += transfer_size;
1542         smp_wmb();
1543         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1544 exit:
1545         return bytes_sent;
1546
1547 }
1548
1549 /*****************************************************************************
1550  * mos7840_throttle
1551  *      this function is called by the tty driver when it wants to stop the data
1552  *      being read from the port.
1553  *****************************************************************************/
1554
1555 static void mos7840_throttle(struct tty_struct *tty)
1556 {
1557         struct usb_serial_port *port = tty->driver_data;
1558         struct moschip_port *mos7840_port;
1559         int status;
1560
1561         if (mos7840_port_paranoia_check(port, __func__)) {
1562                 dbg("%s", "Invalid port \n");
1563                 return;
1564         }
1565
1566         dbg("- port %d\n", port->number);
1567
1568         mos7840_port = mos7840_get_port_private(port);
1569
1570         if (mos7840_port == NULL)
1571                 return;
1572
1573         if (!mos7840_port->open) {
1574                 dbg("%s\n", "port not opened");
1575                 return;
1576         }
1577
1578         dbg("%s", "Entering .......... \n");
1579
1580         /* if we are implementing XON/XOFF, send the stop character */
1581         if (I_IXOFF(tty)) {
1582                 unsigned char stop_char = STOP_CHAR(tty);
1583                 status = mos7840_write(tty, port, &stop_char, 1);
1584                 if (status <= 0)
1585                         return;
1586         }
1587         /* if we are implementing RTS/CTS, toggle that line */
1588         if (tty->termios->c_cflag & CRTSCTS) {
1589                 mos7840_port->shadowMCR &= ~MCR_RTS;
1590                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1591                                          mos7840_port->shadowMCR);
1592                 if (status < 0)
1593                         return;
1594         }
1595
1596         return;
1597 }
1598
1599 /*****************************************************************************
1600  * mos7840_unthrottle
1601  *      this function is called by the tty driver when it wants to resume
1602  *      the data being read from the port (called after mos7840_throttle is
1603  *      called)
1604  *****************************************************************************/
1605 static void mos7840_unthrottle(struct tty_struct *tty)
1606 {
1607         struct usb_serial_port *port = tty->driver_data;
1608         int status;
1609         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1610
1611         if (mos7840_port_paranoia_check(port, __func__)) {
1612                 dbg("%s", "Invalid port \n");
1613                 return;
1614         }
1615
1616         if (mos7840_port == NULL)
1617                 return;
1618
1619         if (!mos7840_port->open) {
1620                 dbg("%s - port not opened", __func__);
1621                 return;
1622         }
1623
1624         dbg("%s", "Entering .......... \n");
1625
1626         /* if we are implementing XON/XOFF, send the start character */
1627         if (I_IXOFF(tty)) {
1628                 unsigned char start_char = START_CHAR(tty);
1629                 status = mos7840_write(tty, port, &start_char, 1);
1630                 if (status <= 0)
1631                         return;
1632         }
1633
1634         /* if we are implementing RTS/CTS, toggle that line */
1635         if (tty->termios->c_cflag & CRTSCTS) {
1636                 mos7840_port->shadowMCR |= MCR_RTS;
1637                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1638                                          mos7840_port->shadowMCR);
1639                 if (status < 0)
1640                         return;
1641         }
1642 }
1643
1644 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1645 {
1646         struct usb_serial_port *port = tty->driver_data;
1647         struct moschip_port *mos7840_port;
1648         unsigned int result;
1649         __u16 msr;
1650         __u16 mcr;
1651         int status;
1652         mos7840_port = mos7840_get_port_private(port);
1653
1654         dbg("%s - port %d", __func__, port->number);
1655
1656         if (mos7840_port == NULL)
1657                 return -ENODEV;
1658
1659         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1660         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1661         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1662             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1663             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1664             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1665             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1666             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1667             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1668
1669         dbg("%s - 0x%04X", __func__, result);
1670
1671         return result;
1672 }
1673
1674 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1675                             unsigned int set, unsigned int clear)
1676 {
1677         struct usb_serial_port *port = tty->driver_data;
1678         struct moschip_port *mos7840_port;
1679         unsigned int mcr;
1680         int status;
1681
1682         dbg("%s - port %d", __func__, port->number);
1683
1684         mos7840_port = mos7840_get_port_private(port);
1685
1686         if (mos7840_port == NULL)
1687                 return -ENODEV;
1688
1689         /* FIXME: What locks the port registers ? */
1690         mcr = mos7840_port->shadowMCR;
1691         if (clear & TIOCM_RTS)
1692                 mcr &= ~MCR_RTS;
1693         if (clear & TIOCM_DTR)
1694                 mcr &= ~MCR_DTR;
1695         if (clear & TIOCM_LOOP)
1696                 mcr &= ~MCR_LOOPBACK;
1697
1698         if (set & TIOCM_RTS)
1699                 mcr |= MCR_RTS;
1700         if (set & TIOCM_DTR)
1701                 mcr |= MCR_DTR;
1702         if (set & TIOCM_LOOP)
1703                 mcr |= MCR_LOOPBACK;
1704
1705         mos7840_port->shadowMCR = mcr;
1706
1707         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1708         if (status < 0) {
1709                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1710                 return status;
1711         }
1712
1713         return 0;
1714 }
1715
1716 /*****************************************************************************
1717  * mos7840_calc_baud_rate_divisor
1718  *      this function calculates the proper baud rate divisor for the specified
1719  *      baud rate.
1720  *****************************************************************************/
1721 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1722                                           __u16 *clk_sel_val)
1723 {
1724
1725         dbg("%s - %d", __func__, baudRate);
1726
1727         if (baudRate <= 115200) {
1728                 *divisor = 115200 / baudRate;
1729                 *clk_sel_val = 0x0;
1730         }
1731         if ((baudRate > 115200) && (baudRate <= 230400)) {
1732                 *divisor = 230400 / baudRate;
1733                 *clk_sel_val = 0x10;
1734         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1735                 *divisor = 403200 / baudRate;
1736                 *clk_sel_val = 0x20;
1737         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1738                 *divisor = 460800 / baudRate;
1739                 *clk_sel_val = 0x30;
1740         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1741                 *divisor = 806400 / baudRate;
1742                 *clk_sel_val = 0x40;
1743         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1744                 *divisor = 921600 / baudRate;
1745                 *clk_sel_val = 0x50;
1746         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1747                 *divisor = 1572864 / baudRate;
1748                 *clk_sel_val = 0x60;
1749         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1750                 *divisor = 3145728 / baudRate;
1751                 *clk_sel_val = 0x70;
1752         }
1753         return 0;
1754
1755 #ifdef NOTMCS7840
1756
1757         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1758                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1759                         *divisor = mos7840_divisor_table[i].Divisor;
1760                         return 0;
1761                 }
1762         }
1763
1764         /* After trying for all the standard baud rates    *
1765          * Try calculating the divisor for this baud rate  */
1766
1767         if (baudrate > 75 && baudrate < 230400) {
1768                 /* get the divisor */
1769                 custom = (__u16) (230400L / baudrate);
1770
1771                 /* Check for round off */
1772                 round1 = (__u16) (2304000L / baudrate);
1773                 round = (__u16) (round1 - (custom * 10));
1774                 if (round > 4)
1775                         custom++;
1776                 *divisor = custom;
1777
1778                 dbg(" Baud %d = %d\n", baudrate, custom);
1779                 return 0;
1780         }
1781
1782         dbg("%s\n", " Baud calculation Failed...");
1783         return -1;
1784 #endif
1785 }
1786
1787 /*****************************************************************************
1788  * mos7840_send_cmd_write_baud_rate
1789  *      this function sends the proper command to change the baud rate of the
1790  *      specified port.
1791  *****************************************************************************/
1792
1793 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1794                                             int baudRate)
1795 {
1796         int divisor = 0;
1797         int status;
1798         __u16 Data;
1799         unsigned char number;
1800         __u16 clk_sel_val;
1801         struct usb_serial_port *port;
1802
1803         if (mos7840_port == NULL)
1804                 return -1;
1805
1806         port = (struct usb_serial_port *)mos7840_port->port;
1807         if (mos7840_port_paranoia_check(port, __func__)) {
1808                 dbg("%s", "Invalid port \n");
1809                 return -1;
1810         }
1811
1812         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1813                 dbg("%s", "Invalid Serial \n");
1814                 return -1;
1815         }
1816
1817         dbg("%s", "Entering .......... \n");
1818
1819         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1820
1821         dbg("%s - port = %d, baud = %d", __func__,
1822             mos7840_port->port->number, baudRate);
1823         /* reset clk_uart_sel in spregOffset */
1824         if (baudRate > 115200) {
1825 #ifdef HW_flow_control
1826                 /* NOTE: need to see the pther register to modify */
1827                 /* setting h/w flow control bit to 1 */
1828                 Data = 0x2b;
1829                 mos7840_port->shadowMCR = Data;
1830                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1831                                                                         Data);
1832                 if (status < 0) {
1833                         dbg("Writing spreg failed in set_serial_baud\n");
1834                         return -1;
1835                 }
1836 #endif
1837
1838         } else {
1839 #ifdef HW_flow_control
1840                 / *setting h/w flow control bit to 0 */
1841                 Data = 0xb;
1842                 mos7840_port->shadowMCR = Data;
1843                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1844                                                                         Data);
1845                 if (status < 0) {
1846                         dbg("Writing spreg failed in set_serial_baud\n");
1847                         return -1;
1848                 }
1849 #endif
1850
1851         }
1852
1853         if (1) {                /* baudRate <= 115200) */
1854                 clk_sel_val = 0x0;
1855                 Data = 0x0;
1856                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1857                                                    &clk_sel_val);
1858                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1859                                                                  &Data);
1860                 if (status < 0) {
1861                         dbg("reading spreg failed in set_serial_baud\n");
1862                         return -1;
1863                 }
1864                 Data = (Data & 0x8f) | clk_sel_val;
1865                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1866                                                                 Data);
1867                 if (status < 0) {
1868                         dbg("Writing spreg failed in set_serial_baud\n");
1869                         return -1;
1870                 }
1871                 /* Calculate the Divisor */
1872
1873                 if (status) {
1874                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1875                         return status;
1876                 }
1877                 /* Enable access to divisor latch */
1878                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1879                 mos7840_port->shadowLCR = Data;
1880                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1881
1882                 /* Write the divisor */
1883                 Data = (unsigned char)(divisor & 0xff);
1884                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1885                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1886
1887                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1888                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1889                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1890
1891                 /* Disable access to divisor latch */
1892                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1893                 mos7840_port->shadowLCR = Data;
1894                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1895
1896         }
1897         return status;
1898 }
1899
1900 /*****************************************************************************
1901  * mos7840_change_port_settings
1902  *      This routine is called to set the UART on the device to match
1903  *      the specified new settings.
1904  *****************************************************************************/
1905
1906 static void mos7840_change_port_settings(struct tty_struct *tty,
1907         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1908 {
1909         int baud;
1910         unsigned cflag;
1911         unsigned iflag;
1912         __u8 lData;
1913         __u8 lParity;
1914         __u8 lStop;
1915         int status;
1916         __u16 Data;
1917         struct usb_serial_port *port;
1918         struct usb_serial *serial;
1919
1920         if (mos7840_port == NULL)
1921                 return;
1922
1923         port = (struct usb_serial_port *)mos7840_port->port;
1924
1925         if (mos7840_port_paranoia_check(port, __func__)) {
1926                 dbg("%s", "Invalid port \n");
1927                 return;
1928         }
1929
1930         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1931                 dbg("%s", "Invalid Serial \n");
1932                 return;
1933         }
1934
1935         serial = port->serial;
1936
1937         dbg("%s - port %d", __func__, mos7840_port->port->number);
1938
1939         if (!mos7840_port->open) {
1940                 dbg("%s - port not opened", __func__);
1941                 return;
1942         }
1943
1944         dbg("%s", "Entering .......... \n");
1945
1946         lData = LCR_BITS_8;
1947         lStop = LCR_STOP_1;
1948         lParity = LCR_PAR_NONE;
1949
1950         cflag = tty->termios->c_cflag;
1951         iflag = tty->termios->c_iflag;
1952
1953         /* Change the number of bits */
1954         if (cflag & CSIZE) {
1955                 switch (cflag & CSIZE) {
1956                 case CS5:
1957                         lData = LCR_BITS_5;
1958                         break;
1959
1960                 case CS6:
1961                         lData = LCR_BITS_6;
1962                         break;
1963
1964                 case CS7:
1965                         lData = LCR_BITS_7;
1966                         break;
1967                 default:
1968                 case CS8:
1969                         lData = LCR_BITS_8;
1970                         break;
1971                 }
1972         }
1973         /* Change the Parity bit */
1974         if (cflag & PARENB) {
1975                 if (cflag & PARODD) {
1976                         lParity = LCR_PAR_ODD;
1977                         dbg("%s - parity = odd", __func__);
1978                 } else {
1979                         lParity = LCR_PAR_EVEN;
1980                         dbg("%s - parity = even", __func__);
1981                 }
1982
1983         } else {
1984                 dbg("%s - parity = none", __func__);
1985         }
1986
1987         if (cflag & CMSPAR)
1988                 lParity = lParity | 0x20;
1989
1990         /* Change the Stop bit */
1991         if (cflag & CSTOPB) {
1992                 lStop = LCR_STOP_2;
1993                 dbg("%s - stop bits = 2", __func__);
1994         } else {
1995                 lStop = LCR_STOP_1;
1996                 dbg("%s - stop bits = 1", __func__);
1997         }
1998
1999         /* Update the LCR with the correct value */
2000         mos7840_port->shadowLCR &=
2001             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2002         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2003
2004         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2005             mos7840_port->shadowLCR);
2006         /* Disable Interrupts */
2007         Data = 0x00;
2008         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2009
2010         Data = 0x00;
2011         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2012
2013         Data = 0xcf;
2014         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2015
2016         /* Send the updated LCR value to the mos7840 */
2017         Data = mos7840_port->shadowLCR;
2018
2019         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2020
2021         Data = 0x00b;
2022         mos7840_port->shadowMCR = Data;
2023         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2024         Data = 0x00b;
2025         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2026
2027         /* set up the MCR register and send it to the mos7840 */
2028
2029         mos7840_port->shadowMCR = MCR_MASTER_IE;
2030         if (cflag & CBAUD)
2031                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2032
2033         if (cflag & CRTSCTS)
2034                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2035         else
2036                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2037
2038         Data = mos7840_port->shadowMCR;
2039         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2040
2041         /* Determine divisor based on baud rate */
2042         baud = tty_get_baud_rate(tty);
2043
2044         if (!baud) {
2045                 /* pick a default, any default... */
2046                 dbg("%s\n", "Picked default baud...");
2047                 baud = 9600;
2048         }
2049
2050         dbg("%s - baud rate = %d", __func__, baud);
2051         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2052
2053         /* Enable Interrupts */
2054         Data = 0x0c;
2055         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2056
2057         if (mos7840_port->read_urb_busy == false) {
2058                 mos7840_port->read_urb->dev = serial->dev;
2059                 mos7840_port->read_urb_busy = true;
2060                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2061                 if (status) {
2062                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2063                             status);
2064                         mos7840_port->read_urb_busy = false;
2065                 }
2066         }
2067         wake_up(&mos7840_port->delta_msr_wait);
2068         mos7840_port->delta_msr_cond = 1;
2069         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2070             mos7840_port->shadowLCR);
2071
2072         return;
2073 }
2074
2075 /*****************************************************************************
2076  * mos7840_set_termios
2077  *      this function is called by the tty driver when it wants to change
2078  *      the termios structure
2079  *****************************************************************************/
2080
2081 static void mos7840_set_termios(struct tty_struct *tty,
2082                                 struct usb_serial_port *port,
2083                                 struct ktermios *old_termios)
2084 {
2085         int status;
2086         unsigned int cflag;
2087         struct usb_serial *serial;
2088         struct moschip_port *mos7840_port;
2089         dbg("mos7840_set_termios: START\n");
2090         if (mos7840_port_paranoia_check(port, __func__)) {
2091                 dbg("%s", "Invalid port \n");
2092                 return;
2093         }
2094
2095         serial = port->serial;
2096
2097         if (mos7840_serial_paranoia_check(serial, __func__)) {
2098                 dbg("%s", "Invalid Serial \n");
2099                 return;
2100         }
2101
2102         mos7840_port = mos7840_get_port_private(port);
2103
2104         if (mos7840_port == NULL)
2105                 return;
2106
2107         if (!mos7840_port->open) {
2108                 dbg("%s - port not opened", __func__);
2109                 return;
2110         }
2111
2112         dbg("%s\n", "setting termios - ");
2113
2114         cflag = tty->termios->c_cflag;
2115
2116         dbg("%s - clfag %08x iflag %08x", __func__,
2117             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2118         dbg("%s - old clfag %08x old iflag %08x", __func__,
2119             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2120         dbg("%s - port %d", __func__, port->number);
2121
2122         /* change the port settings to the new ones specified */
2123
2124         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2125
2126         if (!mos7840_port->read_urb) {
2127                 dbg("%s", "URB KILLED !!!!!\n");
2128                 return;
2129         }
2130
2131         if (mos7840_port->read_urb_busy == false) {
2132                 mos7840_port->read_urb->dev = serial->dev;
2133                 mos7840_port->read_urb_busy = true;
2134                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2135                 if (status) {
2136                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2137                             status);
2138                         mos7840_port->read_urb_busy = false;
2139                 }
2140         }
2141         return;
2142 }
2143
2144 /*****************************************************************************
2145  * mos7840_get_lsr_info - get line status register info
2146  *
2147  * Purpose: Let user call ioctl() to get info when the UART physically
2148  *          is emptied.  On bus types like RS485, the transmitter must
2149  *          release the bus after transmitting. This must be done when
2150  *          the transmit shift register is empty, not be done when the
2151  *          transmit holding register is empty.  This functionality
2152  *          allows an RS485 driver to be written in user space.
2153  *****************************************************************************/
2154
2155 static int mos7840_get_lsr_info(struct tty_struct *tty,
2156                                 unsigned int __user *value)
2157 {
2158         int count;
2159         unsigned int result = 0;
2160
2161         count = mos7840_chars_in_buffer(tty);
2162         if (count == 0) {
2163                 dbg("%s -- Empty", __func__);
2164                 result = TIOCSER_TEMT;
2165         }
2166
2167         if (copy_to_user(value, &result, sizeof(int)))
2168                 return -EFAULT;
2169         return 0;
2170 }
2171
2172 /*****************************************************************************
2173  * mos7840_set_modem_info
2174  *      function to set modem info
2175  *****************************************************************************/
2176
2177 /* FIXME: Should be using the model control hooks */
2178
2179 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2180                                   unsigned int cmd, unsigned int __user *value)
2181 {
2182         unsigned int mcr;
2183         unsigned int arg;
2184         __u16 Data;
2185         int status;
2186         struct usb_serial_port *port;
2187
2188         if (mos7840_port == NULL)
2189                 return -1;
2190
2191         port = (struct usb_serial_port *)mos7840_port->port;
2192         if (mos7840_port_paranoia_check(port, __func__)) {
2193                 dbg("%s", "Invalid port \n");
2194                 return -1;
2195         }
2196
2197         mcr = mos7840_port->shadowMCR;
2198
2199         if (copy_from_user(&arg, value, sizeof(int)))
2200                 return -EFAULT;
2201
2202         switch (cmd) {
2203         case TIOCMBIS:
2204                 if (arg & TIOCM_RTS)
2205                         mcr |= MCR_RTS;
2206                 if (arg & TIOCM_DTR)
2207                         mcr |= MCR_RTS;
2208                 if (arg & TIOCM_LOOP)
2209                         mcr |= MCR_LOOPBACK;
2210                 break;
2211
2212         case TIOCMBIC:
2213                 if (arg & TIOCM_RTS)
2214                         mcr &= ~MCR_RTS;
2215                 if (arg & TIOCM_DTR)
2216                         mcr &= ~MCR_RTS;
2217                 if (arg & TIOCM_LOOP)
2218                         mcr &= ~MCR_LOOPBACK;
2219                 break;
2220
2221         case TIOCMSET:
2222                 /* turn off the RTS and DTR and LOOPBACK
2223                  * and then only turn on what was asked to */
2224                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2225                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2226                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2227                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2228                 break;
2229         }
2230
2231         lock_kernel();
2232         mos7840_port->shadowMCR = mcr;
2233
2234         Data = mos7840_port->shadowMCR;
2235         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2236         unlock_kernel();
2237         if (status < 0) {
2238                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2239                 return -1;
2240         }
2241
2242         return 0;
2243 }
2244
2245 /*****************************************************************************
2246  * mos7840_get_modem_info
2247  *      function to get modem info
2248  *****************************************************************************/
2249
2250 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2251                                   unsigned int __user *value)
2252 {
2253         unsigned int result = 0;
2254         __u16 msr;
2255         unsigned int mcr = mos7840_port->shadowMCR;
2256         mos7840_get_uart_reg(mos7840_port->port,
2257                                                 MODEM_STATUS_REGISTER, &msr);
2258         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2259             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2260             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2261             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2262             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2263             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2264
2265         dbg("%s -- %x", __func__, result);
2266
2267         if (copy_to_user(value, &result, sizeof(int)))
2268                 return -EFAULT;
2269         return 0;
2270 }
2271
2272 /*****************************************************************************
2273  * mos7840_get_serial_info
2274  *      function to get information about serial port
2275  *****************************************************************************/
2276
2277 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2278                                    struct serial_struct __user *retinfo)
2279 {
2280         struct serial_struct tmp;
2281
2282         if (mos7840_port == NULL)
2283                 return -1;
2284
2285         if (!retinfo)
2286                 return -EFAULT;
2287
2288         memset(&tmp, 0, sizeof(tmp));
2289
2290         tmp.type = PORT_16550A;
2291         tmp.line = mos7840_port->port->serial->minor;
2292         tmp.port = mos7840_port->port->number;
2293         tmp.irq = 0;
2294         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2295         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2296         tmp.baud_base = 9600;
2297         tmp.close_delay = 5 * HZ;
2298         tmp.closing_wait = 30 * HZ;
2299
2300         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2301                 return -EFAULT;
2302         return 0;
2303 }
2304
2305 /*****************************************************************************
2306  * SerialIoctl
2307  *      this function handles any ioctl calls to the driver
2308  *****************************************************************************/
2309
2310 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2311                          unsigned int cmd, unsigned long arg)
2312 {
2313         struct usb_serial_port *port = tty->driver_data;
2314         void __user *argp = (void __user *)arg;
2315         struct moschip_port *mos7840_port;
2316
2317         struct async_icount cnow;
2318         struct async_icount cprev;
2319         struct serial_icounter_struct icount;
2320         int mosret = 0;
2321
2322         if (mos7840_port_paranoia_check(port, __func__)) {
2323                 dbg("%s", "Invalid port \n");
2324                 return -1;
2325         }
2326
2327         mos7840_port = mos7840_get_port_private(port);
2328
2329         if (mos7840_port == NULL)
2330                 return -1;
2331
2332         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2333
2334         switch (cmd) {
2335                 /* return number of bytes available */
2336
2337         case TIOCSERGETLSR:
2338                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2339                 return mos7840_get_lsr_info(tty, argp);
2340                 return 0;
2341
2342         /* FIXME: use the modem hooks and remove this */
2343         case TIOCMBIS:
2344         case TIOCMBIC:
2345         case TIOCMSET:
2346                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2347                     port->number);
2348                 mosret =
2349                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2350                 return mosret;
2351
2352         case TIOCMGET:
2353                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2354                 return mos7840_get_modem_info(mos7840_port, argp);
2355
2356         case TIOCGSERIAL:
2357                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2358                 return mos7840_get_serial_info(mos7840_port, argp);
2359
2360         case TIOCSSERIAL:
2361                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2362                 break;
2363
2364         case TIOCMIWAIT:
2365                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2366                 cprev = mos7840_port->icount;
2367                 while (1) {
2368                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2369                         mos7840_port->delta_msr_cond = 0;
2370                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2371                                                  (mos7840_port->
2372                                                   delta_msr_cond == 1));
2373
2374                         /* see if a signal did it */
2375                         if (signal_pending(current))
2376                                 return -ERESTARTSYS;
2377                         cnow = mos7840_port->icount;
2378                         smp_rmb();
2379                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2380                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2381                                 return -EIO;    /* no change => error */
2382                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2383                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2384                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2385                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2386                                 return 0;
2387                         }
2388                         cprev = cnow;
2389                 }
2390                 /* NOTREACHED */
2391                 break;
2392
2393         case TIOCGICOUNT:
2394                 cnow = mos7840_port->icount;
2395                 smp_rmb();
2396                 icount.cts = cnow.cts;
2397                 icount.dsr = cnow.dsr;
2398                 icount.rng = cnow.rng;
2399                 icount.dcd = cnow.dcd;
2400                 icount.rx = cnow.rx;
2401                 icount.tx = cnow.tx;
2402                 icount.frame = cnow.frame;
2403                 icount.overrun = cnow.overrun;
2404                 icount.parity = cnow.parity;
2405                 icount.brk = cnow.brk;
2406                 icount.buf_overrun = cnow.buf_overrun;
2407
2408                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2409                     port->number, icount.rx, icount.tx);
2410                 if (copy_to_user(argp, &icount, sizeof(icount)))
2411                         return -EFAULT;
2412                 return 0;
2413         default:
2414                 break;
2415         }
2416         return -ENOIOCTLCMD;
2417 }
2418
2419 static int mos7840_calc_num_ports(struct usb_serial *serial)
2420 {
2421         int mos7840_num_ports = 0;
2422
2423         dbg("numberofendpoints: %d \n",
2424             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2425         dbg("numberofendpoints: %d \n",
2426             (int)serial->interface->altsetting->desc.bNumEndpoints);
2427         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2428                 mos7840_num_ports = serial->num_ports = 2;
2429         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2430                 serial->num_bulk_in = 4;
2431                 serial->num_bulk_out = 4;
2432                 mos7840_num_ports = serial->num_ports = 4;
2433         }
2434
2435         return mos7840_num_ports;
2436 }
2437
2438 /****************************************************************************
2439  * mos7840_startup
2440  ****************************************************************************/
2441
2442 static int mos7840_startup(struct usb_serial *serial)
2443 {
2444         struct moschip_port *mos7840_port;
2445         struct usb_device *dev;
2446         int i, status;
2447
2448         __u16 Data;
2449         dbg("%s \n", " mos7840_startup :entering..........");
2450
2451         if (!serial) {
2452                 dbg("%s\n", "Invalid Handler");
2453                 return -1;
2454         }
2455
2456         dev = serial->dev;
2457
2458         dbg("%s\n", "Entering...");
2459
2460         /* we set up the pointers to the endpoints in the mos7840_open *
2461          * function, as the structures aren't created yet.             */
2462
2463         /* set up port private structures */
2464         for (i = 0; i < serial->num_ports; ++i) {
2465                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2466                 if (mos7840_port == NULL) {
2467                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2468                         status = -ENOMEM;
2469                         i--; /* don't follow NULL pointer cleaning up */
2470                         goto error;
2471                 }
2472
2473                 /* Initialize all port interrupt end point to port 0 int
2474                  * endpoint. Our device has only one interrupt end point
2475                  * common to all port */
2476
2477                 mos7840_port->port = serial->port[i];
2478                 mos7840_set_port_private(serial->port[i], mos7840_port);
2479                 spin_lock_init(&mos7840_port->pool_lock);
2480
2481                 /* minor is not initialised until later by
2482                  * usb-serial.c:get_free_serial() and cannot therefore be used
2483                  * to index device instances */
2484                 mos7840_port->port_num = i + 1;
2485                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2486                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2487                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2488                 dbg ("serial->minor = %d", serial->minor);
2489
2490                 if (mos7840_port->port_num == 1) {
2491                         mos7840_port->SpRegOffset = 0x0;
2492                         mos7840_port->ControlRegOffset = 0x1;
2493                         mos7840_port->DcrRegOffset = 0x4;
2494                 } else if ((mos7840_port->port_num == 2)
2495                            && (serial->num_ports == 4)) {
2496                         mos7840_port->SpRegOffset = 0x8;
2497                         mos7840_port->ControlRegOffset = 0x9;
2498                         mos7840_port->DcrRegOffset = 0x16;
2499                 } else if ((mos7840_port->port_num == 2)
2500                            && (serial->num_ports == 2)) {
2501                         mos7840_port->SpRegOffset = 0xa;
2502                         mos7840_port->ControlRegOffset = 0xb;
2503                         mos7840_port->DcrRegOffset = 0x19;
2504                 } else if ((mos7840_port->port_num == 3)
2505                            && (serial->num_ports == 4)) {
2506                         mos7840_port->SpRegOffset = 0xa;
2507                         mos7840_port->ControlRegOffset = 0xb;
2508                         mos7840_port->DcrRegOffset = 0x19;
2509                 } else if ((mos7840_port->port_num == 4)
2510                            && (serial->num_ports == 4)) {
2511                         mos7840_port->SpRegOffset = 0xc;
2512                         mos7840_port->ControlRegOffset = 0xd;
2513                         mos7840_port->DcrRegOffset = 0x1c;
2514                 }
2515                 mos7840_dump_serial_port(mos7840_port);
2516                 mos7840_set_port_private(serial->port[i], mos7840_port);
2517
2518                 /* enable rx_disable bit in control register */
2519                 status = mos7840_get_reg_sync(serial->port[i],
2520                                  mos7840_port->ControlRegOffset, &Data);
2521                 if (status < 0) {
2522                         dbg("Reading ControlReg failed status-0x%x\n", status);
2523                         break;
2524                 } else
2525                         dbg("ControlReg Reading success val is %x, status%d\n",
2526                             Data, status);
2527                 Data |= 0x08;   /* setting driver done bit */
2528                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2529                                    modem status reg */
2530
2531                 /* Data |= 0x20; //rx_disable bit */
2532                 status = mos7840_set_reg_sync(serial->port[i],
2533                                          mos7840_port->ControlRegOffset, Data);
2534                 if (status < 0) {
2535                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2536                         break;
2537                 } else
2538                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2539                             status);
2540
2541                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2542                    and 0x24 in DCR3 */
2543                 Data = 0x01;
2544                 status = mos7840_set_reg_sync(serial->port[i],
2545                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2546                 if (status < 0) {
2547                         dbg("Writing DCR0 failed status-0x%x\n", status);
2548                         break;
2549                 } else
2550                         dbg("DCR0 Writing success status%d\n", status);
2551
2552                 Data = 0x05;
2553                 status = mos7840_set_reg_sync(serial->port[i],
2554                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2555                 if (status < 0) {
2556                         dbg("Writing DCR1 failed status-0x%x\n", status);
2557                         break;
2558                 } else
2559                         dbg("DCR1 Writing success status%d\n", status);
2560
2561                 Data = 0x24;
2562                 status = mos7840_set_reg_sync(serial->port[i],
2563                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2564                 if (status < 0) {
2565                         dbg("Writing DCR2 failed status-0x%x\n", status);
2566                         break;
2567                 } else
2568                         dbg("DCR2 Writing success status%d\n", status);
2569
2570                 /* write values in clkstart0x0 and clkmulti 0x20 */
2571                 Data = 0x0;
2572                 status = mos7840_set_reg_sync(serial->port[i],
2573                                          CLK_START_VALUE_REGISTER, Data);
2574                 if (status < 0) {
2575                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2576                         break;
2577                 } else
2578                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2579
2580                 Data = 0x20;
2581                 status = mos7840_set_reg_sync(serial->port[i],
2582                                         CLK_MULTI_REGISTER, Data);
2583                 if (status < 0) {
2584                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2585                             status);
2586                         goto error;
2587                 } else
2588                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2589                             status);
2590
2591                 /* write value 0x0 to scratchpad register */
2592                 Data = 0x00;
2593                 status = mos7840_set_uart_reg(serial->port[i],
2594                                                 SCRATCH_PAD_REGISTER, Data);
2595                 if (status < 0) {
2596                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2597                             status);
2598                         break;
2599                 } else
2600                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2601                             status);
2602
2603                 /* Zero Length flag register */
2604                 if ((mos7840_port->port_num != 1)
2605                     && (serial->num_ports == 2)) {
2606
2607                         Data = 0xff;
2608                         status = mos7840_set_reg_sync(serial->port[i],
2609                                       (__u16) (ZLP_REG1 +
2610                                       ((__u16)mos7840_port->port_num)), Data);
2611                         dbg("ZLIP offset%x\n",
2612                             (__u16) (ZLP_REG1 +
2613                                         ((__u16) mos7840_port->port_num)));
2614                         if (status < 0) {
2615                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2616                                     i + 2, status);
2617                                 break;
2618                         } else
2619                                 dbg("ZLP_REG%d Writing success status%d\n",
2620                                     i + 2, status);
2621                 } else {
2622                         Data = 0xff;
2623                         status = mos7840_set_reg_sync(serial->port[i],
2624                               (__u16) (ZLP_REG1 +
2625                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2626                         dbg("ZLIP offset%x\n",
2627                             (__u16) (ZLP_REG1 +
2628                                      ((__u16) mos7840_port->port_num) - 0x1));
2629                         if (status < 0) {
2630                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2631                                     i + 1, status);
2632                                 break;
2633                         } else
2634                                 dbg("ZLP_REG%d Writing success status%d\n",
2635                                     i + 1, status);
2636
2637                 }
2638                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2639                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2640                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2641                                                                 GFP_KERNEL);
2642                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2643                                                         !mos7840_port->dr) {
2644                         status = -ENOMEM;
2645                         goto error;
2646                 }
2647         }
2648
2649         /* Zero Length flag enable */
2650         Data = 0x0f;
2651         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2652         if (status < 0) {
2653                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2654                 goto error;
2655         } else
2656                 dbg("ZLP_REG5 Writing success status%d\n", status);
2657
2658         /* setting configuration feature to one */
2659         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2660                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2661         return 0;
2662 error:
2663         for (/* nothing */; i >= 0; i--) {
2664                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2665
2666                 kfree(mos7840_port->dr);
2667                 kfree(mos7840_port->ctrl_buf);
2668                 usb_free_urb(mos7840_port->control_urb);
2669                 kfree(mos7840_port);
2670                 serial->port[i] = NULL;
2671         }
2672         return status;
2673 }
2674
2675 /****************************************************************************
2676  * mos7840_shutdown
2677  *      This function is called whenever the device is removed from the usb bus.
2678  ****************************************************************************/
2679
2680 static void mos7840_shutdown(struct usb_serial *serial)
2681 {
2682         int i;
2683         unsigned long flags;
2684         struct moschip_port *mos7840_port;
2685         dbg("%s \n", " shutdown :entering..........");
2686
2687         if (!serial) {
2688                 dbg("%s", "Invalid Handler \n");
2689                 return;
2690         }
2691
2692         /* check for the ports to be closed,close the ports and disconnect */
2693
2694         /* free private structure allocated for serial port  *
2695          * stop reads and writes on all ports                */
2696
2697         for (i = 0; i < serial->num_ports; ++i) {
2698                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2699                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2700                 if (mos7840_port) {
2701                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2702                         mos7840_port->zombie = 1;
2703                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2704                         usb_kill_urb(mos7840_port->control_urb);
2705                         kfree(mos7840_port->ctrl_buf);
2706                         kfree(mos7840_port->dr);
2707                         kfree(mos7840_port);
2708                 }
2709                 mos7840_set_port_private(serial->port[i], NULL);
2710         }
2711
2712         dbg("%s\n", "Thank u :: ");
2713
2714 }
2715
2716 static struct usb_driver io_driver = {
2717         .name = "mos7840",
2718         .probe = usb_serial_probe,
2719         .disconnect = usb_serial_disconnect,
2720         .id_table = moschip_id_table_combined,
2721         .no_dynamic_id = 1,
2722 };
2723
2724 static struct usb_serial_driver moschip7840_4port_device = {
2725         .driver = {
2726                    .owner = THIS_MODULE,
2727                    .name = "mos7840",
2728                    },
2729         .description = DRIVER_DESC,
2730         .usb_driver = &io_driver,
2731         .id_table = moschip_port_id_table,
2732         .num_ports = 4,
2733         .open = mos7840_open,
2734         .close = mos7840_close,
2735         .write = mos7840_write,
2736         .write_room = mos7840_write_room,
2737         .chars_in_buffer = mos7840_chars_in_buffer,
2738         .throttle = mos7840_throttle,
2739         .unthrottle = mos7840_unthrottle,
2740         .calc_num_ports = mos7840_calc_num_ports,
2741 #ifdef MCSSerialProbe
2742         .probe = mos7840_serial_probe,
2743 #endif
2744         .ioctl = mos7840_ioctl,
2745         .set_termios = mos7840_set_termios,
2746         .break_ctl = mos7840_break,
2747         .tiocmget = mos7840_tiocmget,
2748         .tiocmset = mos7840_tiocmset,
2749         .attach = mos7840_startup,
2750         .shutdown = mos7840_shutdown,
2751         .read_bulk_callback = mos7840_bulk_in_callback,
2752         .read_int_callback = mos7840_interrupt_callback,
2753 };
2754
2755 /****************************************************************************
2756  * moschip7840_init
2757  *      This is called by the module subsystem, or on startup to initialize us
2758  ****************************************************************************/
2759 static int __init moschip7840_init(void)
2760 {
2761         int retval;
2762
2763         dbg("%s \n", " mos7840_init :entering..........");
2764
2765         /* Register with the usb serial */
2766         retval = usb_serial_register(&moschip7840_4port_device);
2767
2768         if (retval)
2769                 goto failed_port_device_register;
2770
2771         dbg("%s\n", "Entring...");
2772         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2773                DRIVER_DESC "\n");
2774
2775         /* Register with the usb */
2776         retval = usb_register(&io_driver);
2777         if (retval == 0) {
2778                 dbg("%s\n", "Leaving...");
2779                 return 0;
2780         }
2781         usb_serial_deregister(&moschip7840_4port_device);
2782 failed_port_device_register:
2783         return retval;
2784 }
2785
2786 /****************************************************************************
2787  * moschip7840_exit
2788  *      Called when the driver is about to be unloaded.
2789  ****************************************************************************/
2790 static void __exit moschip7840_exit(void)
2791 {
2792
2793         dbg("%s \n", " mos7840_exit :entering..........");
2794
2795         usb_deregister(&io_driver);
2796
2797         usb_serial_deregister(&moschip7840_4port_device);
2798
2799         dbg("%s\n", "Entring...");
2800 }
2801
2802 module_init(moschip7840_init);
2803 module_exit(moschip7840_exit);
2804
2805 /* Module information */
2806 MODULE_DESCRIPTION(DRIVER_DESC);
2807 MODULE_LICENSE("GPL");
2808
2809 module_param(debug, bool, S_IRUGO | S_IWUSR);
2810 MODULE_PARM_DESC(debug, "Debug enabled or not");