err.no Git - linux-2.6/blob - drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <asm/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.1"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0 )       /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5 )       /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          //Zero_Flag_Reg1    58
 106 #define ZLP_REG5  0x3E          //Zero_Flag_Reg5    62
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 #define USB_VENDOR_ID_MOSCHIP           0x9710
 114 #define MOSCHIP_DEVICE_ID_7840          0x7840
 115 #define MOSCHIP_DEVICE_ID_7820          0x7820
 116
 117 /* Interrupt Rotinue Defines    */
 118
 119 #define SERIAL_IIR_RLS      0x06
 120 #define SERIAL_IIR_MS       0x00
 121
 122 /*
 123  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 124  */
 125 #define SERIAL_LSR_DR       0x0001
 126 #define SERIAL_LSR_OE       0x0002
 127 #define SERIAL_LSR_PE       0x0004
 128 #define SERIAL_LSR_FE       0x0008
 129 #define SERIAL_LSR_BI       0x0010
 130
 131 #define MOS_MSR_DELTA_CTS   0x10
 132 #define MOS_MSR_DELTA_DSR   0x20
 133 #define MOS_MSR_DELTA_RI    0x40
 134 #define MOS_MSR_DELTA_CD    0x80
 135
 136 // Serial Port register Address
 137 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 138 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 139 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 140 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 141 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 142 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 143 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 144 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 145 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 146
 147 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 148 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 149
 150 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 151
 152 /*
 153  * URB POOL related defines
 154  */
 155 #define NUM_URBS                        16      /* URB Count */
 156 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 157
 158
 159 static struct usb_device_id moschip_port_id_table[] = {
 160         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 161         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 162         {}                      /* terminating entry */
 163 };
 164
 165 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 166         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 167         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 168         {}                      /* terminating entry */
 169 };
 170
 171 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 172
 173 /* This structure holds all of the local port information */
 174
 175 struct moschip_port {
 176         int port_num;           /*Actual port number in the device(1,2,etc) */
 177         struct urb *write_urb;  /* write URB for this port */
 178         struct urb *read_urb;   /* read URB for this port */
 179         struct urb *int_urb;
 180         __u8 shadowLCR;         /* last LCR value received */
 181         __u8 shadowMCR;         /* last MCR value received */
 182         char open;
 183         char open_ports;
 184         char zombie;
 185         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 186         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 187         int delta_msr_cond;
 188         struct async_icount icount;
 189         struct usb_serial_port *port;   /* loop back to the owner of this object */
 190
 191         /*Offsets */
 192         __u8 SpRegOffset;
 193         __u8 ControlRegOffset;
 194         __u8 DcrRegOffset;
 195         //for processing control URBS in interrupt context
 196         struct urb *control_urb;
 197         struct usb_ctrlrequest *dr;
 198         char *ctrl_buf;
 199         int MsrLsr;
 200
 201         spinlock_t pool_lock;
 202         struct urb *write_urb_pool[NUM_URBS];
 203         char busy[NUM_URBS];
 204 };
 205
 206
 207 static int debug;
 208
 209 /*
 210  * mos7840_set_reg_sync
 211  *      To set the Control register by calling usb_fill_control_urb function
 212  *      by passing usb_sndctrlpipe function as parameter.
 213  */
 214
 215 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 216                                 __u16 val)
 217 {
 218         struct usb_device *dev = port->serial->dev;
 219         val = val & 0x00ff;
 220         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 221
 222         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 223                                MCS_WR_RTYPE, val, reg, NULL, 0,
 224                                MOS_WDR_TIMEOUT);
 225 }
 226
 227 /*
 228  * mos7840_get_reg_sync
 229  *      To set the Uart register by calling usb_fill_control_urb function by
 230  *      passing usb_rcvctrlpipe function as parameter.
 231  */
 232
 233 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 234                                 __u16 * val)
 235 {
 236         struct usb_device *dev = port->serial->dev;
 237         int ret = 0;
 238
 239         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 240                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 241                               MOS_WDR_TIMEOUT);
 242         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 243         *val = (*val) & 0x00ff;
 244         return ret;
 245 }
 246
 247 /*
 248  * mos7840_set_uart_reg
 249  *      To set the Uart register by calling usb_fill_control_urb function by
 250  *      passing usb_sndctrlpipe function as parameter.
 251  */
 252
 253 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 254                                 __u16 val)
 255 {
 256
 257         struct usb_device *dev = port->serial->dev;
 258         val = val & 0x00ff;
 259         // For the UART control registers, the application number need to be Or'ed
 260         if (port->serial->num_ports == 4) {
 261                 val |=
 262                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 263                      1) << 8;
 264                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 265         } else {
 266                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 267                         val |=
 268                             (((__u16) port->number -
 269                               (__u16) (port->serial->minor)) + 1) << 8;
 270                         dbg("mos7840_set_uart_reg application number is %x\n",
 271                             val);
 272                 } else {
 273                         val |=
 274                             (((__u16) port->number -
 275                               (__u16) (port->serial->minor)) + 2) << 8;
 276                         dbg("mos7840_set_uart_reg application number is %x\n",
 277                             val);
 278                 }
 279         }
 280         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 281                                MCS_WR_RTYPE, val, reg, NULL, 0,
 282                                MOS_WDR_TIMEOUT);
 283
 284 }
 285
 286 /*
 287  * mos7840_get_uart_reg
 288  *      To set the Control register by calling usb_fill_control_urb function
 289  *      by passing usb_rcvctrlpipe function as parameter.
 290  */
 291 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 292                                 __u16 * val)
 293 {
 294         struct usb_device *dev = port->serial->dev;
 295         int ret = 0;
 296         __u16 Wval;
 297
 298         //dbg("application number is %4x \n",(((__u16)port->number - (__u16)(port->serial->minor))+1)<<8);
 299         /*Wval  is same as application number */
 300         if (port->serial->num_ports == 4) {
 301                 Wval =
 302                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 303                      1) << 8;
 304                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 305         } else {
 306                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 307                         Wval =
 308                             (((__u16) port->number -
 309                               (__u16) (port->serial->minor)) + 1) << 8;
 310                         dbg("mos7840_get_uart_reg application number is %x\n",
 311                             Wval);
 312                 } else {
 313                         Wval =
 314                             (((__u16) port->number -
 315                               (__u16) (port->serial->minor)) + 2) << 8;
 316                         dbg("mos7840_get_uart_reg application number is %x\n",
 317                             Wval);
 318                 }
 319         }
 320         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 321                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 322                               MOS_WDR_TIMEOUT);
 323         *val = (*val) & 0x00ff;
 324         return ret;
 325 }
 326
 327 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 328 {
 329
 330         dbg("***************************************\n");
 331         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 332         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 333         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 334         dbg("***************************************\n");
 335
 336 }
 337
 338 /************************************************************************/
 339 /************************************************************************/
 340 /*             I N T E R F A C E   F U N C T I O N S                    */
 341 /*             I N T E R F A C E   F U N C T I O N S                    */
 342 /************************************************************************/
 343 /************************************************************************/
 344
 345 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 346                                             struct moschip_port *data)
 347 {
 348         usb_set_serial_port_data(port, (void *)data);
 349 }
 350
 351 static inline struct moschip_port *mos7840_get_port_private(struct
 352                                                             usb_serial_port
 353                                                             *port)
 354 {
 355         return (struct moschip_port *)usb_get_serial_port_data(port);
 356 }
 357
 358 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 359 {
 360         struct moschip_port *mos7840_port;
 361         struct async_icount *icount;
 362         mos7840_port = port;
 363         icount = &mos7840_port->icount;
 364         if (new_msr &
 365             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 366              MOS_MSR_DELTA_CD)) {
 367                 icount = &mos7840_port->icount;
 368
 369                 /* update input line counters */
 370                 if (new_msr & MOS_MSR_DELTA_CTS) {
 371                         icount->cts++;
 372                         smp_wmb();
 373                 }
 374                 if (new_msr & MOS_MSR_DELTA_DSR) {
 375                         icount->dsr++;
 376                         smp_wmb();
 377                 }
 378                 if (new_msr & MOS_MSR_DELTA_CD) {
 379                         icount->dcd++;
 380                         smp_wmb();
 381                 }
 382                 if (new_msr & MOS_MSR_DELTA_RI) {
 383                         icount->rng++;
 384                         smp_wmb();
 385                 }
 386         }
 387 }
 388
 389 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 390 {
 391         struct async_icount *icount;
 392
 393         dbg("%s - %02x", __FUNCTION__, new_lsr);
 394
 395         if (new_lsr & SERIAL_LSR_BI) {
 396                 //
 397                 // Parity and Framing errors only count if they
 398                 // occur exclusive of a break being
 399                 // received.
 400                 //
 401                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 402         }
 403
 404         /* update input line counters */
 405         icount = &port->icount;
 406         if (new_lsr & SERIAL_LSR_BI) {
 407                 icount->brk++;
 408                 smp_wmb();
 409         }
 410         if (new_lsr & SERIAL_LSR_OE) {
 411                 icount->overrun++;
 412                 smp_wmb();
 413         }
 414         if (new_lsr & SERIAL_LSR_PE) {
 415                 icount->parity++;
 416                 smp_wmb();
 417         }
 418         if (new_lsr & SERIAL_LSR_FE) {
 419                 icount->frame++;
 420                 smp_wmb();
 421         }
 422 }
 423
 424 /************************************************************************/
 425 /************************************************************************/
 426 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 427 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 428 /************************************************************************/
 429 /************************************************************************/
 430
 431 static void mos7840_control_callback(struct urb *urb)
 432 {
 433         unsigned char *data;
 434         struct moschip_port *mos7840_port;
 435         __u8 regval = 0x0;
 436         int result = 0;
 437         int status = urb->status;
 438
 439         if (!urb) {
 440                 dbg("%s", "Invalid Pointer !!!!:\n");
 441                 return;
 442         }
 443
 444         mos7840_port = (struct moschip_port *)urb->context;
 445
 446         switch (status) {
 447         case 0:
 448                 /* success */
 449                 break;
 450         case -ECONNRESET:
 451         case -ENOENT:
 452         case -ESHUTDOWN:
 453                 /* this urb is terminated, clean up */
 454                 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 455                     status);
 456                 return;
 457         default:
 458                 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 459                     status);
 460                 goto exit;
 461         }
 462
 463         dbg("%s urb buffer size is %d\n", __FUNCTION__, urb->actual_length);
 464         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __FUNCTION__,
 465             mos7840_port->MsrLsr, mos7840_port->port_num);
 466         data = urb->transfer_buffer;
 467         regval = (__u8) data[0];
 468         dbg("%s data is %x\n", __FUNCTION__, regval);
 469         if (mos7840_port->MsrLsr == 0)
 470                 mos7840_handle_new_msr(mos7840_port, regval);
 471         else if (mos7840_port->MsrLsr == 1)
 472                 mos7840_handle_new_lsr(mos7840_port, regval);
 473
 474 exit:
 475         spin_lock(&mos7840_port->pool_lock);
 476         if (!mos7840_port->zombie)
 477                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 478         spin_unlock(&mos7840_port->pool_lock);
 479         if (result) {
 480                 dev_err(&urb->dev->dev,
 481                         "%s - Error %d submitting interrupt urb\n",
 482                         __FUNCTION__, result);
 483         }
 484 }
 485
 486 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 487                            __u16 * val)
 488 {
 489         struct usb_device *dev = mcs->port->serial->dev;
 490         struct usb_ctrlrequest *dr = mcs->dr;
 491         unsigned char *buffer = mcs->ctrl_buf;
 492         int ret;
 493
 494         dr->bRequestType = MCS_RD_RTYPE;
 495         dr->bRequest = MCS_RDREQ;
 496         dr->wValue = cpu_to_le16(Wval); //0;
 497         dr->wIndex = cpu_to_le16(reg);
 498         dr->wLength = cpu_to_le16(2);
 499
 500         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 501                              (unsigned char *)dr, buffer, 2,
 502                              mos7840_control_callback, mcs);
 503         mcs->control_urb->transfer_buffer_length = 2;
 504         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 505         return ret;
 506 }
 507
 508 /*****************************************************************************
 509  * mos7840_interrupt_callback
 510  *      this is the callback function for when we have received data on the
 511  *      interrupt endpoint.
 512  *****************************************************************************/
 513
 514 static void mos7840_interrupt_callback(struct urb *urb)
 515 {
 516         int result;
 517         int length;
 518         struct moschip_port *mos7840_port;
 519         struct usb_serial *serial;
 520         __u16 Data;
 521         unsigned char *data;
 522         __u8 sp[5], st;
 523         int i, rv = 0;
 524         __u16 wval, wreg = 0;
 525         int status = urb->status;
 526
 527         dbg("%s", " : Entering\n");
 528         if (!urb) {
 529                 dbg("%s", "Invalid Pointer !!!!:\n");
 530                 return;
 531         }
 532
 533         switch (status) {
 534         case 0:
 535                 /* success */
 536                 break;
 537         case -ECONNRESET:
 538         case -ENOENT:
 539         case -ESHUTDOWN:
 540                 /* this urb is terminated, clean up */
 541                 dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 542                     status);
 543                 return;
 544         default:
 545                 dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 546                     status);
 547                 goto exit;
 548         }
 549
 550         length = urb->actual_length;
 551         data = urb->transfer_buffer;
 552
 553         serial = (struct usb_serial *)urb->context;
 554
 555         /* Moschip get 5 bytes
 556          * Byte 1 IIR Port 1 (port.number is 0)
 557          * Byte 2 IIR Port 2 (port.number is 1)
 558          * Byte 3 IIR Port 3 (port.number is 2)
 559          * Byte 4 IIR Port 4 (port.number is 3)
 560          * Byte 5 FIFO status for both */
 561
 562         if (length && length > 5) {
 563                 dbg("%s \n", "Wrong data !!!");
 564                 return;
 565         }
 566
 567         sp[0] = (__u8) data[0];
 568         sp[1] = (__u8) data[1];
 569         sp[2] = (__u8) data[2];
 570         sp[3] = (__u8) data[3];
 571         st = (__u8) data[4];
 572
 573         for (i = 0; i < serial->num_ports; i++) {
 574                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 575                 wval =
 576                     (((__u16) serial->port[i]->number -
 577                       (__u16) (serial->minor)) + 1) << 8;
 578                 if (mos7840_port->open) {
 579                         if (sp[i] & 0x01) {
 580                                 dbg("SP%d No Interrupt !!!\n", i);
 581                         } else {
 582                                 switch (sp[i] & 0x0f) {
 583                                 case SERIAL_IIR_RLS:
 584                                         dbg("Serial Port %d: Receiver status error or ", i);
 585                                         dbg("address bit detected in 9-bit mode\n");
 586                                         mos7840_port->MsrLsr = 1;
 587                                         wreg = LINE_STATUS_REGISTER;
 588                                         break;
 589                                 case SERIAL_IIR_MS:
 590                                         dbg("Serial Port %d: Modem status change\n", i);
 591                                         mos7840_port->MsrLsr = 0;
 592                                         wreg = MODEM_STATUS_REGISTER;
 593                                         break;
 594                                 }
 595                                 spin_lock(&mos7840_port->pool_lock);
 596                                 if (!mos7840_port->zombie) {
 597                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 598                                 } else {
 599                                         spin_unlock(&mos7840_port->pool_lock);
 600                                         return;
 601                                 }
 602                                 spin_unlock(&mos7840_port->pool_lock);
 603                         }
 604                 }
 605         }
 606         if (!(rv < 0)) /* the completion handler for the control urb will resubmit */
 607                 return;
 608 exit:
 609         result = usb_submit_urb(urb, GFP_ATOMIC);
 610         if (result) {
 611                 dev_err(&urb->dev->dev,
 612                         "%s - Error %d submitting interrupt urb\n",
 613                         __FUNCTION__, result);
 614         }
 615 }
 616
 617 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 618                                        const char *function)
 619 {
 620         if (!port) {
 621                 dbg("%s - port == NULL", function);
 622                 return -1;
 623         }
 624         if (!port->serial) {
 625                 dbg("%s - port->serial == NULL", function);
 626                 return -1;
 627         }
 628
 629         return 0;
 630 }
 631
 632 /* Inline functions to check the sanity of a pointer that is passed to us */
 633 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 634                                          const char *function)
 635 {
 636         if (!serial) {
 637                 dbg("%s - serial == NULL", function);
 638                 return -1;
 639         }
 640         if (!serial->type) {
 641                 dbg("%s - serial->type == NULL!", function);
 642                 return -1;
 643         }
 644
 645         return 0;
 646 }
 647
 648 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 649                                                  const char *function)
 650 {
 651         /* if no port was specified, or it fails a paranoia check */
 652         if (!port ||
 653             mos7840_port_paranoia_check(port, function) ||
 654             mos7840_serial_paranoia_check(port->serial, function)) {
 655                 /* then say that we don't have a valid usb_serial thing, which will
 656                  * end up genrating -ENODEV return values */
 657                 return NULL;
 658         }
 659
 660         return port->serial;
 661 }
 662
 663 /*****************************************************************************
 664  * mos7840_bulk_in_callback
 665  *      this is the callback function for when we have received data on the
 666  *      bulk in endpoint.
 667  *****************************************************************************/
 668
 669 static void mos7840_bulk_in_callback(struct urb *urb)
 670 {
 671         int retval;
 672         unsigned char *data;
 673         struct usb_serial *serial;
 674         struct usb_serial_port *port;
 675         struct moschip_port *mos7840_port;
 676         struct tty_struct *tty;
 677         int status = urb->status;
 678
 679         if (!urb) {
 680                 dbg("%s", "Invalid Pointer !!!!:\n");
 681                 return;
 682         }
 683
 684         if (status) {
 685                 dbg("nonzero read bulk status received: %d", status);
 686                 return;
 687         }
 688
 689         mos7840_port = (struct moschip_port *)urb->context;
 690         if (!mos7840_port) {
 691                 dbg("%s", "NULL mos7840_port pointer \n");
 692                 return;
 693         }
 694
 695         port = (struct usb_serial_port *)mos7840_port->port;
 696         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
 697                 dbg("%s", "Port Paranoia failed \n");
 698                 return;
 699         }
 700
 701         serial = mos7840_get_usb_serial(port, __FUNCTION__);
 702         if (!serial) {
 703                 dbg("%s\n", "Bad serial pointer ");
 704                 return;
 705         }
 706
 707         dbg("%s\n", "Entering... \n");
 708
 709         data = urb->transfer_buffer;
 710
 711         dbg("%s", "Entering ........... \n");
 712
 713         if (urb->actual_length) {
 714                 tty = mos7840_port->port->tty;
 715                 if (tty) {
 716                         tty_buffer_request_room(tty, urb->actual_length);
 717                         tty_insert_flip_string(tty, data, urb->actual_length);
 718                         dbg(" %s \n", data);
 719                         tty_flip_buffer_push(tty);
 720                 }
 721                 mos7840_port->icount.rx += urb->actual_length;
 722                 smp_wmb();
 723                 dbg("mos7840_port->icount.rx is %d:\n",
 724                     mos7840_port->icount.rx);
 725         }
 726
 727         if (!mos7840_port->read_urb) {
 728                 dbg("%s", "URB KILLED !!!\n");
 729                 return;
 730         }
 731
 732
 733         mos7840_port->read_urb->dev = serial->dev;
 734
 735         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 736
 737         if (retval) {
 738                 dbg(" usb_submit_urb(read bulk) failed, retval = %d",
 739                  retval);
 740         }
 741 }
 742
 743 /*****************************************************************************
 744  * mos7840_bulk_out_data_callback
 745  *      this is the callback function for when we have finished sending serial data
 746  *      on the bulk out endpoint.
 747  *****************************************************************************/
 748
 749 static void mos7840_bulk_out_data_callback(struct urb *urb)
 750 {
 751         struct moschip_port *mos7840_port;
 752         struct tty_struct *tty;
 753         int status = urb->status;
 754         int i;
 755
 756         if (!urb) {
 757                 dbg("%s", "Invalid Pointer !!!!:\n");
 758                 return;
 759         }
 760
 761         mos7840_port = (struct moschip_port *)urb->context;
 762         spin_lock(&mos7840_port->pool_lock);
 763         for (i = 0; i < NUM_URBS; i++) {
 764                 if (urb == mos7840_port->write_urb_pool[i]) {
 765                         mos7840_port->busy[i] = 0;
 766                         break;
 767                 }
 768         }
 769         spin_unlock(&mos7840_port->pool_lock);
 770
 771         if (status) {
 772                 dbg("nonzero write bulk status received:%d\n", status);
 773                 return;
 774         }
 775
 776         if (mos7840_port_paranoia_check(mos7840_port->port, __FUNCTION__)) {
 777                 dbg("%s", "Port Paranoia failed \n");
 778                 return;
 779         }
 780
 781         dbg("%s \n", "Entering .........");
 782
 783         tty = mos7840_port->port->tty;
 784
 785         if (tty && mos7840_port->open)
 786                 tty_wakeup(tty);
 787
 788 }
 789
 790 /************************************************************************/
 791 /*       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       */
 792 /************************************************************************/
 793 #ifdef MCSSerialProbe
 794 static int mos7840_serial_probe(struct usb_serial *serial,
 795                                 const struct usb_device_id *id)
 796 {
 797
 798         /*need to implement the mode_reg reading and updating\
 799            structures usb_serial_ device_type\
 800            (i.e num_ports, num_bulkin,bulkout etc) */
 801         /* Also we can update the changes  attach */
 802         return 1;
 803 }
 804 #endif
 805
 806 /*****************************************************************************
 807  * mos7840_open
 808  *      this function is called by the tty driver when a port is opened
 809  *      If successful, we return 0
 810  *      Otherwise we return a negative error number.
 811  *****************************************************************************/
 812
 813 static int mos7840_open(struct usb_serial_port *port, struct file *filp)
 814 {
 815         int response;
 816         int j;
 817         struct usb_serial *serial;
 818         struct urb *urb;
 819         __u16 Data;
 820         int status;
 821         struct moschip_port *mos7840_port;
 822         struct moschip_port *port0;
 823
 824         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
 825                 dbg("%s", "Port Paranoia failed \n");
 826                 return -ENODEV;
 827         }
 828
 829         serial = port->serial;
 830
 831         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
 832                 dbg("%s", "Serial Paranoia failed \n");
 833                 return -ENODEV;
 834         }
 835
 836         mos7840_port = mos7840_get_port_private(port);
 837         port0 = mos7840_get_port_private(serial->port[0]);
 838
 839         if (mos7840_port == NULL || port0 == NULL)
 840                 return -ENODEV;
 841
 842         usb_clear_halt(serial->dev, port->write_urb->pipe);
 843         usb_clear_halt(serial->dev, port->read_urb->pipe);
 844         port0->open_ports++;
 845
 846         /* Initialising the write urb pool */
 847         for (j = 0; j < NUM_URBS; ++j) {
 848                 urb = usb_alloc_urb(0, GFP_KERNEL);
 849                 mos7840_port->write_urb_pool[j] = urb;
 850
 851                 if (urb == NULL) {
 852                         err("No more urbs???");
 853                         continue;
 854                 }
 855
 856                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
 857                 if (!urb->transfer_buffer) {
 858                         usb_free_urb(urb);
 859                         mos7840_port->write_urb_pool[j] = NULL;
 860                         err("%s-out of memory for urb buffers.", __FUNCTION__);
 861                         continue;
 862                 }
 863         }
 864
 865 /*****************************************************************************
 866  * Initialize MCS7840 -- Write Init values to corresponding Registers
 867  *
 868  * Register Index
 869  * 1 : IER
 870  * 2 : FCR
 871  * 3 : LCR
 872  * 4 : MCR
 873  *
 874  * 0x08 : SP1/2 Control Reg
 875  *****************************************************************************/
 876
 877 //NEED to check the following Block
 878
 879         status = 0;
 880         Data = 0x0;
 881         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 882         if (status < 0) {
 883                 dbg("Reading Spreg failed\n");
 884                 return -1;
 885         }
 886         Data |= 0x80;
 887         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 888         if (status < 0) {
 889                 dbg("writing Spreg failed\n");
 890                 return -1;
 891         }
 892
 893         Data &= ~0x80;
 894         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 895         if (status < 0) {
 896                 dbg("writing Spreg failed\n");
 897                 return -1;
 898         }
 899 //End of block to be checked
 900
 901         status = 0;
 902         Data = 0x0;
 903         status =
 904             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 905         if (status < 0) {
 906                 dbg("Reading Controlreg failed\n");
 907                 return -1;
 908         }
 909         Data |= 0x08;           //Driver done bit
 910         Data |= 0x20;           //rx_disable
 911         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 912         if (status < 0) {
 913                 dbg("writing Controlreg failed\n");
 914                 return -1;
 915         }
 916         //do register settings here
 917         // Set all regs to the device default values.
 918         ////////////////////////////////////
 919         // First Disable all interrupts.
 920         ////////////////////////////////////
 921
 922         Data = 0x00;
 923         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 924         if (status < 0) {
 925                 dbg("disableing interrupts failed\n");
 926                 return -1;
 927         }
 928         // Set FIFO_CONTROL_REGISTER to the default value
 929         Data = 0x00;
 930         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 931         if (status < 0) {
 932                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 933                 return -1;
 934         }
 935
 936         Data = 0xcf;
 937         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 938         if (status < 0) {
 939                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 940                 return -1;
 941         }
 942
 943         Data = 0x03;
 944         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 945         mos7840_port->shadowLCR = Data;
 946
 947         Data = 0x0b;
 948         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 949         mos7840_port->shadowMCR = Data;
 950
 951         Data = 0x00;
 952         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 953         mos7840_port->shadowLCR = Data;
 954
 955         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
 956         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 957
 958         Data = 0x0c;
 959         status = 0;
 960         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 961
 962         Data = 0x0;
 963         status = 0;
 964         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 965
 966         Data = 0x00;
 967         status = 0;
 968         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 969
 970         Data = Data & ~SERIAL_LCR_DLAB;
 971         status = 0;
 972         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 973         mos7840_port->shadowLCR = Data;
 974
 975         //clearing Bulkin and Bulkout Fifo
 976         Data = 0x0;
 977         status = 0;
 978         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 979
 980         Data = Data | 0x0c;
 981         status = 0;
 982         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 983
 984         Data = Data & ~0x0c;
 985         status = 0;
 986         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 987         //Finally enable all interrupts
 988         Data = 0x0;
 989         Data = 0x0c;
 990         status = 0;
 991         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 992
 993         //clearing rx_disable
 994         Data = 0x0;
 995         status = 0;
 996         status =
 997             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 998         Data = Data & ~0x20;
 999         status = 0;
1000         status =
1001             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
1002
1003         // rx_negate
1004         Data = 0x0;
1005         status = 0;
1006         status =
1007             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
1008         Data = Data | 0x10;
1009         status = 0;
1010         status =
1011             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
1012
1013         /* force low_latency on so that our tty_push actually forces *
1014          * the data through,otherwise it is scheduled, and with      *
1015          * high data rates (like with OHCI) data can get lost.       */
1016
1017         if (port->tty)
1018                 port->tty->low_latency = 1;
1019 /* Check to see if we've set up our endpoint info yet    *
1020      * (can't set it up in mos7840_startup as the structures *
1021      * were not set up at that time.)                        */
1022         if (port0->open_ports == 1) {
1023                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1024
1025                         /* set up interrupt urb */
1026
1027                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1028                                          serial->dev,
1029                                          usb_rcvintpipe(serial->dev,
1030                                                         serial->port[0]->
1031                                                         interrupt_in_endpointAddress),
1032                                          serial->port[0]->interrupt_in_buffer,
1033                                          serial->port[0]->interrupt_in_urb->
1034                                          transfer_buffer_length,
1035                                          mos7840_interrupt_callback,
1036                                          serial,
1037                                          serial->port[0]->interrupt_in_urb->
1038                                          interval);
1039
1040                         /* start interrupt read for mos7840               *
1041                          * will continue as long as mos7840 is connected  */
1042
1043                         response =
1044                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1045                                            GFP_KERNEL);
1046                         if (response) {
1047                                 err("%s - Error %d submitting interrupt urb",
1048                                     __FUNCTION__, response);
1049                         }
1050
1051                 }
1052
1053         }
1054
1055         /* see if we've set up our endpoint info yet   *
1056          * (can't set it up in mos7840_startup as the  *
1057          * structures were not set up at that time.)   */
1058
1059         dbg("port number is %d \n", port->number);
1060         dbg("serial number is %d \n", port->serial->minor);
1061         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1062         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1063         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1064         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1065         mos7840_port->read_urb = port->read_urb;
1066
1067         /* set up our bulk in urb */
1068
1069         usb_fill_bulk_urb(mos7840_port->read_urb,
1070                           serial->dev,
1071                           usb_rcvbulkpipe(serial->dev,
1072                                           port->bulk_in_endpointAddress),
1073                           port->bulk_in_buffer,
1074                           mos7840_port->read_urb->transfer_buffer_length,
1075                           mos7840_bulk_in_callback, mos7840_port);
1076
1077         dbg("mos7840_open: bulkin endpoint is %d\n",
1078             port->bulk_in_endpointAddress);
1079         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1080         if (response) {
1081                 err("%s - Error %d submitting control urb", __FUNCTION__,
1082                     response);
1083         }
1084
1085         /* initialize our wait queues */
1086         init_waitqueue_head(&mos7840_port->wait_chase);
1087         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1088
1089         /* initialize our icount structure */
1090         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1091
1092         /* initialize our port settings */
1093         mos7840_port->shadowMCR = MCR_MASTER_IE;        /* Must set to enable ints! */
1094         /* send a open port command */
1095         mos7840_port->open = 1;
1096         //mos7840_change_port_settings(mos7840_port,old_termios);
1097         mos7840_port->icount.tx = 0;
1098         mos7840_port->icount.rx = 0;
1099
1100         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n", serial, mos7840_port, port);
1101
1102         return 0;
1103
1104 }
1105
1106 /*****************************************************************************
1107  * mos7840_chars_in_buffer
1108  *      this function is called by the tty driver when it wants to know how many
1109  *      bytes of data we currently have outstanding in the port (data that has
1110  *      been written, but hasn't made it out the port yet)
1111  *      If successful, we return the number of bytes left to be written in the
1112  *      system,
1113  *      Otherwise we return a negative error number.
1114  *****************************************************************************/
1115
1116 static int mos7840_chars_in_buffer(struct usb_serial_port *port)
1117 {
1118         int i;
1119         int chars = 0;
1120         unsigned long flags;
1121         struct moschip_port *mos7840_port;
1122
1123         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1124
1125         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1126                 dbg("%s", "Invalid port \n");
1127                 return -1;
1128         }
1129
1130         mos7840_port = mos7840_get_port_private(port);
1131         if (mos7840_port == NULL) {
1132                 dbg("%s \n", "mos7840_break:leaving ...........");
1133                 return -1;
1134         }
1135
1136         spin_lock_irqsave(&mos7840_port->pool_lock,flags);
1137         for (i = 0; i < NUM_URBS; ++i) {
1138                 if (mos7840_port->busy[i]) {
1139                         chars += URB_TRANSFER_BUFFER_SIZE;
1140                 }
1141         }
1142         spin_unlock_irqrestore(&mos7840_port->pool_lock,flags);
1143         dbg("%s - returns %d", __FUNCTION__, chars);
1144         return chars;
1145
1146 }
1147
1148 /************************************************************************
1149  *
1150  * mos7840_block_until_tx_empty
1151  *
1152  *      This function will block the close until one of the following:
1153  *              1. TX count are 0
1154  *              2. The mos7840 has stopped
1155  *              3. A timout of 3 seconds without activity has expired
1156  *
1157  ************************************************************************/
1158 static void mos7840_block_until_tx_empty(struct moschip_port *mos7840_port)
1159 {
1160         int timeout = HZ / 10;
1161         int wait = 30;
1162         int count;
1163
1164         while (1) {
1165
1166                 count = mos7840_chars_in_buffer(mos7840_port->port);
1167
1168                 /* Check for Buffer status */
1169                 if (count <= 0) {
1170                         return;
1171                 }
1172
1173                 /* Block the thread for a while */
1174                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1175                                                timeout);
1176
1177                 /* No activity.. count down section */
1178                 wait--;
1179                 if (wait == 0) {
1180                         dbg("%s - TIMEOUT", __FUNCTION__);
1181                         return;
1182                 } else {
1183                         /* Reset timout value back to seconds */
1184                         wait = 30;
1185                 }
1186         }
1187 }
1188
1189 /*****************************************************************************
1190  * mos7840_close
1191  *      this function is called by the tty driver when a port is closed
1192  *****************************************************************************/
1193
1194 static void mos7840_close(struct usb_serial_port *port, struct file *filp)
1195 {
1196         struct usb_serial *serial;
1197         struct moschip_port *mos7840_port;
1198         struct moschip_port *port0;
1199         int j;
1200         __u16 Data;
1201
1202         dbg("%s\n", "mos7840_close:entering...");
1203
1204         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1205                 dbg("%s", "Port Paranoia failed \n");
1206                 return;
1207         }
1208
1209         serial = mos7840_get_usb_serial(port, __FUNCTION__);
1210         if (!serial) {
1211                 dbg("%s", "Serial Paranoia failed \n");
1212                 return;
1213         }
1214
1215         mos7840_port = mos7840_get_port_private(port);
1216         port0 = mos7840_get_port_private(serial->port[0]);
1217
1218         if (mos7840_port == NULL || port0 == NULL)
1219                 return;
1220
1221         for (j = 0; j < NUM_URBS; ++j)
1222                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1223
1224         /* Freeing Write URBs */
1225         for (j = 0; j < NUM_URBS; ++j) {
1226                 if (mos7840_port->write_urb_pool[j]) {
1227                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1228                                 kfree(mos7840_port->write_urb_pool[j]->
1229                                       transfer_buffer);
1230
1231                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1232                 }
1233         }
1234
1235         if (serial->dev) {
1236                 /* flush and block until tx is empty */
1237                 mos7840_block_until_tx_empty(mos7840_port);
1238         }
1239
1240         /* While closing port, shutdown all bulk read, write  *
1241          * and interrupt read if they exists                  */
1242         if (serial->dev) {
1243
1244                 if (mos7840_port->write_urb) {
1245                         dbg("%s", "Shutdown bulk write\n");
1246                         usb_kill_urb(mos7840_port->write_urb);
1247                 }
1248
1249                 if (mos7840_port->read_urb) {
1250                         dbg("%s", "Shutdown bulk read\n");
1251                         usb_kill_urb(mos7840_port->read_urb);
1252                 }
1253                 if ((&mos7840_port->control_urb)) {
1254                         dbg("%s", "Shutdown control read\n");
1255                         //      usb_kill_urb (mos7840_port->control_urb);
1256
1257                 }
1258         }
1259 //              if(mos7840_port->ctrl_buf != NULL)
1260 //                      kfree(mos7840_port->ctrl_buf);
1261         port0->open_ports--;
1262         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1263             port0->open_ports, port->number);
1264         if (port0->open_ports == 0) {
1265                 if (serial->port[0]->interrupt_in_urb) {
1266                         dbg("%s", "Shutdown interrupt_in_urb\n");
1267                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1268                 }
1269         }
1270
1271         if (mos7840_port->write_urb) {
1272                 /* if this urb had a transfer buffer already (old tx) free it */
1273
1274                 if (mos7840_port->write_urb->transfer_buffer != NULL) {
1275                         kfree(mos7840_port->write_urb->transfer_buffer);
1276                 }
1277                 usb_free_urb(mos7840_port->write_urb);
1278         }
1279
1280         Data = 0x0;
1281         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1282
1283         Data = 0x00;
1284         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1285
1286         mos7840_port->open = 0;
1287
1288         dbg("%s \n", "Leaving ............");
1289 }
1290
1291 /************************************************************************
1292  *
1293  * mos7840_block_until_chase_response
1294  *
1295  *      This function will block the close until one of the following:
1296  *              1. Response to our Chase comes from mos7840
1297  *              2. A timout of 10 seconds without activity has expired
1298  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1299  *
1300  ************************************************************************/
1301
1302 static void mos7840_block_until_chase_response(struct moschip_port
1303                                                *mos7840_port)
1304 {
1305         int timeout = 1 * HZ;
1306         int wait = 10;
1307         int count;
1308
1309         while (1) {
1310                 count = mos7840_chars_in_buffer(mos7840_port->port);
1311
1312                 /* Check for Buffer status */
1313                 if (count <= 0) {
1314                         return;
1315                 }
1316
1317                 /* Block the thread for a while */
1318                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1319                                                timeout);
1320                 /* No activity.. count down section */
1321                 wait--;
1322                 if (wait == 0) {
1323                         dbg("%s - TIMEOUT", __FUNCTION__);
1324                         return;
1325                 } else {
1326                         /* Reset timout value back to seconds */
1327                         wait = 10;
1328                 }
1329         }
1330
1331 }
1332
1333 /*****************************************************************************
1334  * mos7840_break
1335  *      this function sends a break to the port
1336  *****************************************************************************/
1337 static void mos7840_break(struct usb_serial_port *port, int break_state)
1338 {
1339         unsigned char data;
1340         struct usb_serial *serial;
1341         struct moschip_port *mos7840_port;
1342
1343         dbg("%s \n", "Entering ...........");
1344         dbg("mos7840_break: Start\n");
1345
1346         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1347                 dbg("%s", "Port Paranoia failed \n");
1348                 return;
1349         }
1350
1351         serial = mos7840_get_usb_serial(port, __FUNCTION__);
1352         if (!serial) {
1353                 dbg("%s", "Serial Paranoia failed \n");
1354                 return;
1355         }
1356
1357         mos7840_port = mos7840_get_port_private(port);
1358
1359         if (mos7840_port == NULL) {
1360                 return;
1361         }
1362
1363         if (serial->dev) {
1364
1365                 /* flush and block until tx is empty */
1366                 mos7840_block_until_chase_response(mos7840_port);
1367         }
1368
1369         if (break_state == -1) {
1370                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1371         } else {
1372                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1373         }
1374
1375         mos7840_port->shadowLCR = data;
1376         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1377             mos7840_port->shadowLCR);
1378         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1379                              mos7840_port->shadowLCR);
1380
1381         return;
1382 }
1383
1384 /*****************************************************************************
1385  * mos7840_write_room
1386  *      this function is called by the tty driver when it wants to know how many
1387  *      bytes of data we can accept for a specific port.
1388  *      If successful, we return the amount of room that we have for this port
1389  *      Otherwise we return a negative error number.
1390  *****************************************************************************/
1391
1392 static int mos7840_write_room(struct usb_serial_port *port)
1393 {
1394         int i;
1395         int room = 0;
1396         unsigned long flags;
1397         struct moschip_port *mos7840_port;
1398
1399         dbg("%s \n", " mos7840_write_room:entering ...........");
1400
1401         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1402                 dbg("%s", "Invalid port \n");
1403                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1404                 return -1;
1405         }
1406
1407         mos7840_port = mos7840_get_port_private(port);
1408         if (mos7840_port == NULL) {
1409                 dbg("%s \n", "mos7840_break:leaving ...........");
1410                 return -1;
1411         }
1412
1413         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1414         for (i = 0; i < NUM_URBS; ++i) {
1415                 if (!mos7840_port->busy[i]) {
1416                         room += URB_TRANSFER_BUFFER_SIZE;
1417                 }
1418         }
1419         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1420
1421         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1422         dbg("%s - returns %d", __FUNCTION__, room);
1423         return room;
1424
1425 }
1426
1427 /*****************************************************************************
1428  * mos7840_write
1429  *      this function is called by the tty driver when data should be written to
1430  *      the port.
1431  *      If successful, we return the number of bytes written, otherwise we
1432  *      return a negative error number.
1433  *****************************************************************************/
1434
1435 static int mos7840_write(struct usb_serial_port *port,
1436                          const unsigned char *data, int count)
1437 {
1438         int status;
1439         int i;
1440         int bytes_sent = 0;
1441         int transfer_size;
1442         unsigned long flags;
1443
1444         struct moschip_port *mos7840_port;
1445         struct usb_serial *serial;
1446         struct urb *urb;
1447         //__u16 Data;
1448         const unsigned char *current_position = data;
1449         unsigned char *data1;
1450         dbg("%s \n", "entering ...........");
1451         //dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",mos7840_port->shadowLCR);
1452
1453 #ifdef NOTMOS7840
1454         Data = 0x00;
1455         status = 0;
1456         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1457         mos7840_port->shadowLCR = Data;
1458         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1459         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1460             mos7840_port->shadowLCR);
1461
1462         //Data = 0x03;
1463         //status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data);
1464         //mos7840_port->shadowLCR=Data;//Need to add later
1465
1466         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
1467         status = 0;
1468         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1469
1470         //Data = 0x0c;
1471         //status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data);
1472         Data = 0x00;
1473         status = 0;
1474         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1475         dbg("mos7840_write:DLL value is %x\n", Data);
1476
1477         Data = 0x0;
1478         status = 0;
1479         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1480         dbg("mos7840_write:DLM value is %x\n", Data);
1481
1482         Data = Data & ~SERIAL_LCR_DLAB;
1483         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1484             mos7840_port->shadowLCR);
1485         status = 0;
1486         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1487 #endif
1488
1489         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1490                 dbg("%s", "Port Paranoia failed \n");
1491                 return -1;
1492         }
1493
1494         serial = port->serial;
1495         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
1496                 dbg("%s", "Serial Paranoia failed \n");
1497                 return -1;
1498         }
1499
1500         mos7840_port = mos7840_get_port_private(port);
1501         if (mos7840_port == NULL) {
1502                 dbg("%s", "mos7840_port is NULL\n");
1503                 return -1;
1504         }
1505
1506         /* try to find a free urb in the list */
1507         urb = NULL;
1508
1509         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1510         for (i = 0; i < NUM_URBS; ++i) {
1511                 if (!mos7840_port->busy[i]) {
1512                         mos7840_port->busy[i] = 1;
1513                         urb = mos7840_port->write_urb_pool[i];
1514                         dbg("\nURB:%d", i);
1515                         break;
1516                 }
1517         }
1518         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1519
1520         if (urb == NULL) {
1521                 dbg("%s - no more free urbs", __FUNCTION__);
1522                 goto exit;
1523         }
1524
1525         if (urb->transfer_buffer == NULL) {
1526                 urb->transfer_buffer =
1527                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1528
1529                 if (urb->transfer_buffer == NULL) {
1530                         err("%s no more kernel memory...", __FUNCTION__);
1531                         goto exit;
1532                 }
1533         }
1534         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1535
1536         memcpy(urb->transfer_buffer, current_position, transfer_size);
1537
1538         /* fill urb with data and submit  */
1539         usb_fill_bulk_urb(urb,
1540                           serial->dev,
1541                           usb_sndbulkpipe(serial->dev,
1542                                           port->bulk_out_endpointAddress),
1543                           urb->transfer_buffer,
1544                           transfer_size,
1545                           mos7840_bulk_out_data_callback, mos7840_port);
1546
1547         data1 = urb->transfer_buffer;
1548         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1549
1550         /* send it down the pipe */
1551         status = usb_submit_urb(urb, GFP_ATOMIC);
1552
1553         if (status) {
1554                 mos7840_port->busy[i] = 0;
1555                 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1556                     __FUNCTION__, status);
1557                 bytes_sent = status;
1558                 goto exit;
1559         }
1560         bytes_sent = transfer_size;
1561         mos7840_port->icount.tx += transfer_size;
1562         smp_wmb();
1563         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1564       exit:
1565
1566         return bytes_sent;
1567
1568 }
1569
1570 /*****************************************************************************
1571  * mos7840_throttle
1572  *      this function is called by the tty driver when it wants to stop the data
1573  *      being read from the port.
1574  *****************************************************************************/
1575
1576 static void mos7840_throttle(struct usb_serial_port *port)
1577 {
1578         struct moschip_port *mos7840_port;
1579         struct tty_struct *tty;
1580         int status;
1581
1582         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1583                 dbg("%s", "Invalid port \n");
1584                 return;
1585         }
1586
1587         dbg("- port %d\n", port->number);
1588
1589         mos7840_port = mos7840_get_port_private(port);
1590
1591         if (mos7840_port == NULL)
1592                 return;
1593
1594         if (!mos7840_port->open) {
1595                 dbg("%s\n", "port not opened");
1596                 return;
1597         }
1598
1599         dbg("%s", "Entering .......... \n");
1600
1601         tty = port->tty;
1602         if (!tty) {
1603                 dbg("%s - no tty available", __FUNCTION__);
1604                 return;
1605         }
1606
1607         /* if we are implementing XON/XOFF, send the stop character */
1608         if (I_IXOFF(tty)) {
1609                 unsigned char stop_char = STOP_CHAR(tty);
1610                 status = mos7840_write(port, &stop_char, 1);
1611                 if (status <= 0) {
1612                         return;
1613                 }
1614         }
1615
1616         /* if we are implementing RTS/CTS, toggle that line */
1617         if (tty->termios->c_cflag & CRTSCTS) {
1618                 mos7840_port->shadowMCR &= ~MCR_RTS;
1619                 status = 0;
1620                 status =
1621                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1622                                          mos7840_port->shadowMCR);
1623
1624                 if (status < 0) {
1625                         return;
1626                 }
1627         }
1628
1629         return;
1630 }
1631
1632 /*****************************************************************************
1633  * mos7840_unthrottle
1634  *      this function is called by the tty driver when it wants to resume the data
1635  *      being read from the port (called after SerialThrottle is called)
1636  *****************************************************************************/
1637 static void mos7840_unthrottle(struct usb_serial_port *port)
1638 {
1639         struct tty_struct *tty;
1640         int status;
1641         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1642
1643         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1644                 dbg("%s", "Invalid port \n");
1645                 return;
1646         }
1647
1648         if (mos7840_port == NULL)
1649                 return;
1650
1651         if (!mos7840_port->open) {
1652                 dbg("%s - port not opened", __FUNCTION__);
1653                 return;
1654         }
1655
1656         dbg("%s", "Entering .......... \n");
1657
1658         tty = port->tty;
1659         if (!tty) {
1660                 dbg("%s - no tty available", __FUNCTION__);
1661                 return;
1662         }
1663
1664         /* if we are implementing XON/XOFF, send the start character */
1665         if (I_IXOFF(tty)) {
1666                 unsigned char start_char = START_CHAR(tty);
1667                 status = mos7840_write(port, &start_char, 1);
1668                 if (status <= 0) {
1669                         return;
1670                 }
1671         }
1672
1673         /* if we are implementing RTS/CTS, toggle that line */
1674         if (tty->termios->c_cflag & CRTSCTS) {
1675                 mos7840_port->shadowMCR |= MCR_RTS;
1676                 status = 0;
1677                 status =
1678                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1679                                          mos7840_port->shadowMCR);
1680                 if (status < 0) {
1681                         return;
1682                 }
1683         }
1684
1685         return;
1686 }
1687
1688 static int mos7840_tiocmget(struct usb_serial_port *port, struct file *file)
1689 {
1690         struct moschip_port *mos7840_port;
1691         unsigned int result;
1692         __u16 msr;
1693         __u16 mcr;
1694         int status = 0;
1695         mos7840_port = mos7840_get_port_private(port);
1696
1697         dbg("%s - port %d", __FUNCTION__, port->number);
1698
1699         if (mos7840_port == NULL)
1700                 return -ENODEV;
1701
1702         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1703         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1704         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1705             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1706             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1707             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1708             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1709             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1710             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1711
1712         dbg("%s - 0x%04X", __FUNCTION__, result);
1713
1714         return result;
1715 }
1716
1717 static int mos7840_tiocmset(struct usb_serial_port *port, struct file *file,
1718                             unsigned int set, unsigned int clear)
1719 {
1720         struct moschip_port *mos7840_port;
1721         unsigned int mcr;
1722         unsigned int status;
1723
1724         dbg("%s - port %d", __FUNCTION__, port->number);
1725
1726         mos7840_port = mos7840_get_port_private(port);
1727
1728         if (mos7840_port == NULL)
1729                 return -ENODEV;
1730
1731         mcr = mos7840_port->shadowMCR;
1732         if (clear & TIOCM_RTS)
1733                 mcr &= ~MCR_RTS;
1734         if (clear & TIOCM_DTR)
1735                 mcr &= ~MCR_DTR;
1736         if (clear & TIOCM_LOOP)
1737                 mcr &= ~MCR_LOOPBACK;
1738
1739         if (set & TIOCM_RTS)
1740                 mcr |= MCR_RTS;
1741         if (set & TIOCM_DTR)
1742                 mcr |= MCR_DTR;
1743         if (set & TIOCM_LOOP)
1744                 mcr |= MCR_LOOPBACK;
1745
1746         mos7840_port->shadowMCR = mcr;
1747
1748         status = 0;
1749         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1750         if (status < 0) {
1751                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1752                 return -1;
1753         }
1754
1755         return 0;
1756 }
1757
1758 /*****************************************************************************
1759  * mos7840_calc_baud_rate_divisor
1760  *      this function calculates the proper baud rate divisor for the specified
1761  *      baud rate.
1762  *****************************************************************************/
1763 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1764                                           __u16 * clk_sel_val)
1765 {
1766
1767         dbg("%s - %d", __FUNCTION__, baudRate);
1768
1769         if (baudRate <= 115200) {
1770                 *divisor = 115200 / baudRate;
1771                 *clk_sel_val = 0x0;
1772         }
1773         if ((baudRate > 115200) && (baudRate <= 230400)) {
1774                 *divisor = 230400 / baudRate;
1775                 *clk_sel_val = 0x10;
1776         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1777                 *divisor = 403200 / baudRate;
1778                 *clk_sel_val = 0x20;
1779         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1780                 *divisor = 460800 / baudRate;
1781                 *clk_sel_val = 0x30;
1782         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1783                 *divisor = 806400 / baudRate;
1784                 *clk_sel_val = 0x40;
1785         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1786                 *divisor = 921600 / baudRate;
1787                 *clk_sel_val = 0x50;
1788         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1789                 *divisor = 1572864 / baudRate;
1790                 *clk_sel_val = 0x60;
1791         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1792                 *divisor = 3145728 / baudRate;
1793                 *clk_sel_val = 0x70;
1794         }
1795         return 0;
1796
1797 #ifdef NOTMCS7840
1798
1799         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1800                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1801                         *divisor = mos7840_divisor_table[i].Divisor;
1802                         return 0;
1803                 }
1804         }
1805
1806         /* After trying for all the standard baud rates    *
1807          * Try calculating the divisor for this baud rate  */
1808
1809         if (baudrate > 75 && baudrate < 230400) {
1810                 /* get the divisor */
1811                 custom = (__u16) (230400L / baudrate);
1812
1813                 /* Check for round off */
1814                 round1 = (__u16) (2304000L / baudrate);
1815                 round = (__u16) (round1 - (custom * 10));
1816                 if (round > 4) {
1817                         custom++;
1818                 }
1819                 *divisor = custom;
1820
1821                 dbg(" Baud %d = %d\n", baudrate, custom);
1822                 return 0;
1823         }
1824
1825         dbg("%s\n", " Baud calculation Failed...");
1826         return -1;
1827 #endif
1828 }
1829
1830 /*****************************************************************************
1831  * mos7840_send_cmd_write_baud_rate
1832  *      this function sends the proper command to change the baud rate of the
1833  *      specified port.
1834  *****************************************************************************/
1835
1836 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1837                                             int baudRate)
1838 {
1839         int divisor = 0;
1840         int status;
1841         __u16 Data;
1842         unsigned char number;
1843         __u16 clk_sel_val;
1844         struct usb_serial_port *port;
1845
1846         if (mos7840_port == NULL)
1847                 return -1;
1848
1849         port = (struct usb_serial_port *)mos7840_port->port;
1850         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1851                 dbg("%s", "Invalid port \n");
1852                 return -1;
1853         }
1854
1855         if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1856                 dbg("%s", "Invalid Serial \n");
1857                 return -1;
1858         }
1859
1860         dbg("%s", "Entering .......... \n");
1861
1862         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1863
1864         dbg("%s - port = %d, baud = %d", __FUNCTION__,
1865             mos7840_port->port->number, baudRate);
1866         //reset clk_uart_sel in spregOffset
1867         if (baudRate > 115200) {
1868 #ifdef HW_flow_control
1869                 //NOTE: need to see the pther register to modify
1870                 //setting h/w flow control bit to 1;
1871                 status = 0;
1872                 Data = 0x2b;
1873                 mos7840_port->shadowMCR = Data;
1874                 status =
1875                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1876                 if (status < 0) {
1877                         dbg("Writing spreg failed in set_serial_baud\n");
1878                         return -1;
1879                 }
1880 #endif
1881
1882         } else {
1883 #ifdef HW_flow_control
1884                 //setting h/w flow control bit to 0;
1885                 status = 0;
1886                 Data = 0xb;
1887                 mos7840_port->shadowMCR = Data;
1888                 status =
1889                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1890                 if (status < 0) {
1891                         dbg("Writing spreg failed in set_serial_baud\n");
1892                         return -1;
1893                 }
1894 #endif
1895
1896         }
1897
1898         if (1)                  //baudRate <= 115200)
1899         {
1900                 clk_sel_val = 0x0;
1901                 Data = 0x0;
1902                 status = 0;
1903                 status =
1904                     mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1905                                                    &clk_sel_val);
1906                 status =
1907                     mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1908                                          &Data);
1909                 if (status < 0) {
1910                         dbg("reading spreg failed in set_serial_baud\n");
1911                         return -1;
1912                 }
1913                 Data = (Data & 0x8f) | clk_sel_val;
1914                 status = 0;
1915                 status =
1916                     mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1917                 if (status < 0) {
1918                         dbg("Writing spreg failed in set_serial_baud\n");
1919                         return -1;
1920                 }
1921                 /* Calculate the Divisor */
1922
1923                 if (status) {
1924                         err("%s - bad baud rate", __FUNCTION__);
1925                         dbg("%s\n", "bad baud rate");
1926                         return status;
1927                 }
1928                 /* Enable access to divisor latch */
1929                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1930                 mos7840_port->shadowLCR = Data;
1931                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1932
1933                 /* Write the divisor */
1934                 Data = (unsigned char)(divisor & 0xff);
1935                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1936                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1937
1938                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1939                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1940                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1941
1942                 /* Disable access to divisor latch */
1943                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1944                 mos7840_port->shadowLCR = Data;
1945                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1946
1947         }
1948
1949         return status;
1950 }
1951
1952 /*****************************************************************************
1953  * mos7840_change_port_settings
1954  *      This routine is called to set the UART on the device to match
1955  *      the specified new settings.
1956  *****************************************************************************/
1957
1958 static void mos7840_change_port_settings(struct moschip_port *mos7840_port,
1959                                          struct ktermios *old_termios)
1960 {
1961         struct tty_struct *tty;
1962         int baud;
1963         unsigned cflag;
1964         unsigned iflag;
1965         __u8 lData;
1966         __u8 lParity;
1967         __u8 lStop;
1968         int status;
1969         __u16 Data;
1970         struct usb_serial_port *port;
1971         struct usb_serial *serial;
1972
1973         if (mos7840_port == NULL)
1974                 return;
1975
1976         port = (struct usb_serial_port *)mos7840_port->port;
1977
1978         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
1979                 dbg("%s", "Invalid port \n");
1980                 return;
1981         }
1982
1983         if (mos7840_serial_paranoia_check(port->serial, __FUNCTION__)) {
1984                 dbg("%s", "Invalid Serial \n");
1985                 return;
1986         }
1987
1988         serial = port->serial;
1989
1990         dbg("%s - port %d", __FUNCTION__, mos7840_port->port->number);
1991
1992         if (!mos7840_port->open) {
1993                 dbg("%s - port not opened", __FUNCTION__);
1994                 return;
1995         }
1996
1997         tty = mos7840_port->port->tty;
1998
1999         if ((!tty) || (!tty->termios)) {
2000                 dbg("%s - no tty structures", __FUNCTION__);
2001                 return;
2002         }
2003
2004         dbg("%s", "Entering .......... \n");
2005
2006         lData = LCR_BITS_8;
2007         lStop = LCR_STOP_1;
2008         lParity = LCR_PAR_NONE;
2009
2010         cflag = tty->termios->c_cflag;
2011         iflag = tty->termios->c_iflag;
2012
2013         /* Change the number of bits */
2014         if (cflag & CSIZE) {
2015                 switch (cflag & CSIZE) {
2016                 case CS5:
2017                         lData = LCR_BITS_5;
2018                         break;
2019
2020                 case CS6:
2021                         lData = LCR_BITS_6;
2022                         break;
2023
2024                 case CS7:
2025                         lData = LCR_BITS_7;
2026                         break;
2027                 default:
2028                 case CS8:
2029                         lData = LCR_BITS_8;
2030                         break;
2031                 }
2032         }
2033         /* Change the Parity bit */
2034         if (cflag & PARENB) {
2035                 if (cflag & PARODD) {
2036                         lParity = LCR_PAR_ODD;
2037                         dbg("%s - parity = odd", __FUNCTION__);
2038                 } else {
2039                         lParity = LCR_PAR_EVEN;
2040                         dbg("%s - parity = even", __FUNCTION__);
2041                 }
2042
2043         } else {
2044                 dbg("%s - parity = none", __FUNCTION__);
2045         }
2046
2047         if (cflag & CMSPAR) {
2048                 lParity = lParity | 0x20;
2049         }
2050
2051         /* Change the Stop bit */
2052         if (cflag & CSTOPB) {
2053                 lStop = LCR_STOP_2;
2054                 dbg("%s - stop bits = 2", __FUNCTION__);
2055         } else {
2056                 lStop = LCR_STOP_1;
2057                 dbg("%s - stop bits = 1", __FUNCTION__);
2058         }
2059
2060         /* Update the LCR with the correct value */
2061         mos7840_port->shadowLCR &=
2062             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2063         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2064
2065         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2066             mos7840_port->shadowLCR);
2067         /* Disable Interrupts */
2068         Data = 0x00;
2069         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2070
2071         Data = 0x00;
2072         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2073
2074         Data = 0xcf;
2075         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2076
2077         /* Send the updated LCR value to the mos7840 */
2078         Data = mos7840_port->shadowLCR;
2079
2080         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2081
2082         Data = 0x00b;
2083         mos7840_port->shadowMCR = Data;
2084         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2085         Data = 0x00b;
2086         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2087
2088         /* set up the MCR register and send it to the mos7840 */
2089
2090         mos7840_port->shadowMCR = MCR_MASTER_IE;
2091         if (cflag & CBAUD) {
2092                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2093         }
2094
2095         if (cflag & CRTSCTS) {
2096                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2097
2098         } else {
2099                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2100         }
2101
2102         Data = mos7840_port->shadowMCR;
2103         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2104
2105         /* Determine divisor based on baud rate */
2106         baud = tty_get_baud_rate(tty);
2107
2108         if (!baud) {
2109                 /* pick a default, any default... */
2110                 dbg("%s\n", "Picked default baud...");
2111                 baud = 9600;
2112         }
2113
2114         dbg("%s - baud rate = %d", __FUNCTION__, baud);
2115         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2116
2117         /* Enable Interrupts */
2118         Data = 0x0c;
2119         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2120
2121         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2122                 mos7840_port->read_urb->dev = serial->dev;
2123
2124                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2125
2126                 if (status) {
2127                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2128                             status);
2129                 }
2130         }
2131         wake_up(&mos7840_port->delta_msr_wait);
2132         mos7840_port->delta_msr_cond = 1;
2133         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2134             mos7840_port->shadowLCR);
2135
2136         return;
2137 }
2138
2139 /*****************************************************************************
2140  * mos7840_set_termios
2141  *      this function is called by the tty driver when it wants to change
2142  *      the termios structure
2143  *****************************************************************************/
2144
2145 static void mos7840_set_termios(struct usb_serial_port *port,
2146                                 struct ktermios *old_termios)
2147 {
2148         int status;
2149         unsigned int cflag;
2150         struct usb_serial *serial;
2151         struct moschip_port *mos7840_port;
2152         struct tty_struct *tty;
2153         dbg("mos7840_set_termios: START\n");
2154         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2155                 dbg("%s", "Invalid port \n");
2156                 return;
2157         }
2158
2159         serial = port->serial;
2160
2161         if (mos7840_serial_paranoia_check(serial, __FUNCTION__)) {
2162                 dbg("%s", "Invalid Serial \n");
2163                 return;
2164         }
2165
2166         mos7840_port = mos7840_get_port_private(port);
2167
2168         if (mos7840_port == NULL)
2169                 return;
2170
2171         tty = port->tty;
2172
2173         if (!port->tty || !port->tty->termios) {
2174                 dbg("%s - no tty or termios", __FUNCTION__);
2175                 return;
2176         }
2177
2178         if (!mos7840_port->open) {
2179                 dbg("%s - port not opened", __FUNCTION__);
2180                 return;
2181         }
2182
2183         dbg("%s\n", "setting termios - ");
2184
2185         cflag = tty->termios->c_cflag;
2186
2187         if (!cflag) {
2188                 dbg("%s %s\n", __FUNCTION__, "cflag is NULL");
2189                 return;
2190         }
2191
2192         dbg("%s - clfag %08x iflag %08x", __FUNCTION__,
2193             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2194
2195         if (old_termios) {
2196                 dbg("%s - old clfag %08x old iflag %08x", __FUNCTION__,
2197                     old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2198         }
2199
2200         dbg("%s - port %d", __FUNCTION__, port->number);
2201
2202         /* change the port settings to the new ones specified */
2203
2204         mos7840_change_port_settings(mos7840_port, old_termios);
2205
2206         if (!mos7840_port->read_urb) {
2207                 dbg("%s", "URB KILLED !!!!!\n");
2208                 return;
2209         }
2210
2211         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2212                 mos7840_port->read_urb->dev = serial->dev;
2213                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2214                 if (status) {
2215                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2216                             status);
2217                 }
2218         }
2219         return;
2220 }
2221
2222 /*****************************************************************************
2223  * mos7840_get_lsr_info - get line status register info
2224  *
2225  * Purpose: Let user call ioctl() to get info when the UART physically
2226  *          is emptied.  On bus types like RS485, the transmitter must
2227  *          release the bus after transmitting. This must be done when
2228  *          the transmit shift register is empty, not be done when the
2229  *          transmit holding register is empty.  This functionality
2230  *          allows an RS485 driver to be written in user space.
2231  *****************************************************************************/
2232
2233 static int mos7840_get_lsr_info(struct moschip_port *mos7840_port,
2234                                 unsigned int __user *value)
2235 {
2236         int count;
2237         unsigned int result = 0;
2238
2239         count = mos7840_chars_in_buffer(mos7840_port->port);
2240         if (count == 0) {
2241                 dbg("%s -- Empty", __FUNCTION__);
2242                 result = TIOCSER_TEMT;
2243         }
2244
2245         if (copy_to_user(value, &result, sizeof(int)))
2246                 return -EFAULT;
2247         return 0;
2248 }
2249
2250 /*****************************************************************************
2251  * mos7840_set_modem_info
2252  *      function to set modem info
2253  *****************************************************************************/
2254
2255 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2256                                   unsigned int cmd, unsigned int __user *value)
2257 {
2258         unsigned int mcr;
2259         unsigned int arg;
2260         __u16 Data;
2261         int status;
2262         struct usb_serial_port *port;
2263
2264         if (mos7840_port == NULL)
2265                 return -1;
2266
2267         port = (struct usb_serial_port *)mos7840_port->port;
2268         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2269                 dbg("%s", "Invalid port \n");
2270                 return -1;
2271         }
2272
2273         mcr = mos7840_port->shadowMCR;
2274
2275         if (copy_from_user(&arg, value, sizeof(int)))
2276                 return -EFAULT;
2277
2278         switch (cmd) {
2279         case TIOCMBIS:
2280                 if (arg & TIOCM_RTS)
2281                         mcr |= MCR_RTS;
2282                 if (arg & TIOCM_DTR)
2283                         mcr |= MCR_RTS;
2284                 if (arg & TIOCM_LOOP)
2285                         mcr |= MCR_LOOPBACK;
2286                 break;
2287
2288         case TIOCMBIC:
2289                 if (arg & TIOCM_RTS)
2290                         mcr &= ~MCR_RTS;
2291                 if (arg & TIOCM_DTR)
2292                         mcr &= ~MCR_RTS;
2293                 if (arg & TIOCM_LOOP)
2294                         mcr &= ~MCR_LOOPBACK;
2295                 break;
2296
2297         case TIOCMSET:
2298                 /* turn off the RTS and DTR and LOOPBACK
2299                  * and then only turn on what was asked to */
2300                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2301                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2302                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2303                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2304                 break;
2305         }
2306
2307         mos7840_port->shadowMCR = mcr;
2308
2309         Data = mos7840_port->shadowMCR;
2310         status = 0;
2311         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2312         if (status < 0) {
2313                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2314                 return -1;
2315         }
2316
2317         return 0;
2318 }
2319
2320 /*****************************************************************************
2321  * mos7840_get_modem_info
2322  *      function to get modem info
2323  *****************************************************************************/
2324
2325 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2326                                   unsigned int __user *value)
2327 {
2328         unsigned int result = 0;
2329         __u16 msr;
2330         unsigned int mcr = mos7840_port->shadowMCR;
2331         int status = 0;
2332         status =
2333             mos7840_get_uart_reg(mos7840_port->port, MODEM_STATUS_REGISTER,
2334                                  &msr);
2335         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2336             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2337             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2338             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2339             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2340             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2341
2342         dbg("%s -- %x", __FUNCTION__, result);
2343
2344         if (copy_to_user(value, &result, sizeof(int)))
2345                 return -EFAULT;
2346         return 0;
2347 }
2348
2349 /*****************************************************************************
2350  * mos7840_get_serial_info
2351  *      function to get information about serial port
2352  *****************************************************************************/
2353
2354 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2355                                    struct serial_struct __user *retinfo)
2356 {
2357         struct serial_struct tmp;
2358
2359         if (mos7840_port == NULL)
2360                 return -1;
2361
2362         if (!retinfo)
2363                 return -EFAULT;
2364
2365         memset(&tmp, 0, sizeof(tmp));
2366
2367         tmp.type = PORT_16550A;
2368         tmp.line = mos7840_port->port->serial->minor;
2369         tmp.port = mos7840_port->port->number;
2370         tmp.irq = 0;
2371         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2372         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2373         tmp.baud_base = 9600;
2374         tmp.close_delay = 5 * HZ;
2375         tmp.closing_wait = 30 * HZ;
2376
2377         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2378                 return -EFAULT;
2379         return 0;
2380 }
2381
2382 /*****************************************************************************
2383  * SerialIoctl
2384  *      this function handles any ioctl calls to the driver
2385  *****************************************************************************/
2386
2387 static int mos7840_ioctl(struct usb_serial_port *port, struct file *file,
2388                          unsigned int cmd, unsigned long arg)
2389 {
2390         void __user *argp = (void __user *)arg;
2391         struct moschip_port *mos7840_port;
2392         struct tty_struct *tty;
2393
2394         struct async_icount cnow;
2395         struct async_icount cprev;
2396         struct serial_icounter_struct icount;
2397         int mosret = 0;
2398
2399         if (mos7840_port_paranoia_check(port, __FUNCTION__)) {
2400                 dbg("%s", "Invalid port \n");
2401                 return -1;
2402         }
2403
2404         mos7840_port = mos7840_get_port_private(port);
2405
2406         if (mos7840_port == NULL)
2407                 return -1;
2408
2409         tty = mos7840_port->port->tty;
2410
2411         dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
2412
2413         switch (cmd) {
2414                 /* return number of bytes available */
2415
2416         case TIOCSERGETLSR:
2417                 dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__, port->number);
2418                 return mos7840_get_lsr_info(mos7840_port, argp);
2419                 return 0;
2420
2421         case TIOCMBIS:
2422         case TIOCMBIC:
2423         case TIOCMSET:
2424                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
2425                     port->number);
2426                 mosret =
2427                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2428                 return mosret;
2429
2430         case TIOCMGET:
2431                 dbg("%s (%d) TIOCMGET", __FUNCTION__, port->number);
2432                 return mos7840_get_modem_info(mos7840_port, argp);
2433
2434         case TIOCGSERIAL:
2435                 dbg("%s (%d) TIOCGSERIAL", __FUNCTION__, port->number);
2436                 return mos7840_get_serial_info(mos7840_port, argp);
2437
2438         case TIOCSSERIAL:
2439                 dbg("%s (%d) TIOCSSERIAL", __FUNCTION__, port->number);
2440                 break;
2441
2442         case TIOCMIWAIT:
2443                 dbg("%s (%d) TIOCMIWAIT", __FUNCTION__, port->number);
2444                 cprev = mos7840_port->icount;
2445                 while (1) {
2446                         //interruptible_sleep_on(&mos7840_port->delta_msr_wait);
2447                         mos7840_port->delta_msr_cond = 0;
2448                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2449                                                  (mos7840_port->
2450                                                   delta_msr_cond == 1));
2451
2452                         /* see if a signal did it */
2453                         if (signal_pending(current))
2454                                 return -ERESTARTSYS;
2455                         cnow = mos7840_port->icount;
2456                         smp_rmb();
2457                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2458                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2459                                 return -EIO;    /* no change => error */
2460                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2461                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2462                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2463                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2464                                 return 0;
2465                         }
2466                         cprev = cnow;
2467                 }
2468                 /* NOTREACHED */
2469                 break;
2470
2471         case TIOCGICOUNT:
2472                 cnow = mos7840_port->icount;
2473                 smp_rmb();
2474                 icount.cts = cnow.cts;
2475                 icount.dsr = cnow.dsr;
2476                 icount.rng = cnow.rng;
2477                 icount.dcd = cnow.dcd;
2478                 icount.rx = cnow.rx;
2479                 icount.tx = cnow.tx;
2480                 icount.frame = cnow.frame;
2481                 icount.overrun = cnow.overrun;
2482                 icount.parity = cnow.parity;
2483                 icount.brk = cnow.brk;
2484                 icount.buf_overrun = cnow.buf_overrun;
2485
2486                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
2487                     port->number, icount.rx, icount.tx);
2488                 if (copy_to_user(argp, &icount, sizeof(icount)))
2489                         return -EFAULT;
2490                 return 0;
2491
2492         case TIOCEXBAUD:
2493                 return 0;
2494         default:
2495                 break;
2496         }
2497
2498         return -ENOIOCTLCMD;
2499 }
2500
2501 static int mos7840_calc_num_ports(struct usb_serial *serial)
2502 {
2503         int mos7840_num_ports = 0;
2504
2505         dbg("numberofendpoints: %d \n",
2506             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2507         dbg("numberofendpoints: %d \n",
2508             (int)serial->interface->altsetting->desc.bNumEndpoints);
2509         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2510                 mos7840_num_ports = serial->num_ports = 2;
2511         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2512                 serial->num_bulk_in = 4;
2513                 serial->num_bulk_out = 4;
2514                 mos7840_num_ports = serial->num_ports = 4;
2515         }
2516
2517         return mos7840_num_ports;
2518 }
2519
2520 /****************************************************************************
2521  * mos7840_startup
2522  ****************************************************************************/
2523
2524 static int mos7840_startup(struct usb_serial *serial)
2525 {
2526         struct moschip_port *mos7840_port;
2527         struct usb_device *dev;
2528         int i, status;
2529
2530         __u16 Data;
2531         dbg("%s \n", " mos7840_startup :entering..........");
2532
2533         if (!serial) {
2534                 dbg("%s\n", "Invalid Handler");
2535                 return -1;
2536         }
2537
2538         dev = serial->dev;
2539
2540         dbg("%s\n", "Entering...");
2541
2542         /* we set up the pointers to the endpoints in the mos7840_open *
2543          * function, as the structures aren't created yet.             */
2544
2545         /* set up port private structures */
2546         for (i = 0; i < serial->num_ports; ++i) {
2547                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2548                 if (mos7840_port == NULL) {
2549                         err("%s - Out of memory", __FUNCTION__);
2550                         status = -ENOMEM;
2551                         i--; /* don't follow NULL pointer cleaning up */
2552                         goto error;
2553                 }
2554
2555                 /* Initialize all port interrupt end point to port 0 int endpoint *
2556                  * Our device has only one interrupt end point comman to all port */
2557
2558                 mos7840_port->port = serial->port[i];
2559                 mos7840_set_port_private(serial->port[i], mos7840_port);
2560                 spin_lock_init(&mos7840_port->pool_lock);
2561
2562                 mos7840_port->port_num = ((serial->port[i]->number -
2563                                            (serial->port[i]->serial->minor)) +
2564                                           1);
2565
2566                 if (mos7840_port->port_num == 1) {
2567                         mos7840_port->SpRegOffset = 0x0;
2568                         mos7840_port->ControlRegOffset = 0x1;
2569                         mos7840_port->DcrRegOffset = 0x4;
2570                 } else if ((mos7840_port->port_num == 2)
2571                            && (serial->num_ports == 4)) {
2572                         mos7840_port->SpRegOffset = 0x8;
2573                         mos7840_port->ControlRegOffset = 0x9;
2574                         mos7840_port->DcrRegOffset = 0x16;
2575                 } else if ((mos7840_port->port_num == 2)
2576                            && (serial->num_ports == 2)) {
2577                         mos7840_port->SpRegOffset = 0xa;
2578                         mos7840_port->ControlRegOffset = 0xb;
2579                         mos7840_port->DcrRegOffset = 0x19;
2580                 } else if ((mos7840_port->port_num == 3)
2581                            && (serial->num_ports == 4)) {
2582                         mos7840_port->SpRegOffset = 0xa;
2583                         mos7840_port->ControlRegOffset = 0xb;
2584                         mos7840_port->DcrRegOffset = 0x19;
2585                 } else if ((mos7840_port->port_num == 4)
2586                            && (serial->num_ports == 4)) {
2587                         mos7840_port->SpRegOffset = 0xc;
2588                         mos7840_port->ControlRegOffset = 0xd;
2589                         mos7840_port->DcrRegOffset = 0x1c;
2590                 }
2591                 mos7840_dump_serial_port(mos7840_port);
2592
2593                 mos7840_set_port_private(serial->port[i], mos7840_port);
2594
2595                 //enable rx_disable bit in control register
2596
2597                 status =
2598                     mos7840_get_reg_sync(serial->port[i],
2599                                          mos7840_port->ControlRegOffset, &Data);
2600                 if (status < 0) {
2601                         dbg("Reading ControlReg failed status-0x%x\n", status);
2602                         break;
2603                 } else
2604                         dbg("ControlReg Reading success val is %x, status%d\n",
2605                             Data, status);
2606                 Data |= 0x08;   //setting driver done bit
2607                 Data |= 0x04;   //sp1_bit to have cts change reflect in modem status reg
2608
2609                 //Data |= 0x20; //rx_disable bit
2610                 status = 0;
2611                 status =
2612                     mos7840_set_reg_sync(serial->port[i],
2613                                          mos7840_port->ControlRegOffset, Data);
2614                 if (status < 0) {
2615                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2616                         break;
2617                 } else
2618                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2619                             status);
2620
2621                 //Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
2622                 Data = 0x01;
2623                 status = 0;
2624                 status =
2625                     mos7840_set_reg_sync(serial->port[i],
2626                                          (__u16) (mos7840_port->DcrRegOffset +
2627                                                   0), Data);
2628                 if (status < 0) {
2629                         dbg("Writing DCR0 failed status-0x%x\n", status);
2630                         break;
2631                 } else
2632                         dbg("DCR0 Writing success status%d\n", status);
2633
2634                 Data = 0x05;
2635                 status = 0;
2636                 status =
2637                     mos7840_set_reg_sync(serial->port[i],
2638                                          (__u16) (mos7840_port->DcrRegOffset +
2639                                                   1), Data);
2640                 if (status < 0) {
2641                         dbg("Writing DCR1 failed status-0x%x\n", status);
2642                         break;
2643                 } else
2644                         dbg("DCR1 Writing success status%d\n", status);
2645
2646                 Data = 0x24;
2647                 status = 0;
2648                 status =
2649                     mos7840_set_reg_sync(serial->port[i],
2650                                          (__u16) (mos7840_port->DcrRegOffset +
2651                                                   2), Data);
2652                 if (status < 0) {
2653                         dbg("Writing DCR2 failed status-0x%x\n", status);
2654                         break;
2655                 } else
2656                         dbg("DCR2 Writing success status%d\n", status);
2657
2658                 // write values in clkstart0x0 and clkmulti 0x20
2659                 Data = 0x0;
2660                 status = 0;
2661                 status =
2662                     mos7840_set_reg_sync(serial->port[i],
2663                                          CLK_START_VALUE_REGISTER, Data);
2664                 if (status < 0) {
2665                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2666                         break;
2667                 } else
2668                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2669
2670                 Data = 0x20;
2671                 status =
2672                     mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
2673                                          Data);
2674                 if (status < 0) {
2675                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2676                             status);
2677                         goto error;
2678                 } else
2679                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2680                             status);
2681
2682                 //write value 0x0 to scratchpad register
2683                 Data = 0x00;
2684                 status =
2685                     mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
2686                                          Data);
2687                 if (status < 0) {
2688                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2689                             status);
2690                         break;
2691                 } else
2692                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2693                             status);
2694
2695                 //Zero Length flag register
2696                 if ((mos7840_port->port_num != 1)
2697                     && (serial->num_ports == 2)) {
2698
2699                         Data = 0xff;
2700                         status = 0;
2701                         status = mos7840_set_reg_sync(serial->port[i],
2702                                                       (__u16) (ZLP_REG1 +
2703                                                                ((__u16)
2704                                                                 mos7840_port->
2705                                                                 port_num)),
2706                                                       Data);
2707                         dbg("ZLIP offset%x\n",
2708                             (__u16) (ZLP_REG1 +
2709                                      ((__u16) mos7840_port->port_num)));
2710                         if (status < 0) {
2711                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2712                                     i + 2, status);
2713                                 break;
2714                         } else
2715                                 dbg("ZLP_REG%d Writing success status%d\n",
2716                                     i + 2, status);
2717                 } else {
2718                         Data = 0xff;
2719                         status = 0;
2720                         status = mos7840_set_reg_sync(serial->port[i],
2721                                                       (__u16) (ZLP_REG1 +
2722                                                                ((__u16)
2723                                                                 mos7840_port->
2724                                                                 port_num) -
2725                                                                0x1), Data);
2726                         dbg("ZLIP offset%x\n",
2727                             (__u16) (ZLP_REG1 +
2728                                      ((__u16) mos7840_port->port_num) - 0x1));
2729                         if (status < 0) {
2730                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2731                                     i + 1, status);
2732                                 break;
2733                         } else
2734                                 dbg("ZLP_REG%d Writing success status%d\n",
2735                                     i + 1, status);
2736
2737                 }
2738                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2739                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2740                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
2741                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || !mos7840_port->dr) {
2742                         status = -ENOMEM;
2743                         goto error;
2744                 }
2745         }
2746
2747         //Zero Length flag enable
2748         Data = 0x0f;
2749         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2750         if (status < 0) {
2751                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2752                 return -1;
2753         } else
2754                 dbg("ZLP_REG5 Writing success status%d\n", status);
2755
2756         /* setting configuration feature to one */
2757         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2758                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2759         return 0;
2760 error:
2761         for (/* nothing */; i >= 0; i--) {
2762                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2763
2764                 kfree(mos7840_port->dr);
2765                 kfree(mos7840_port->ctrl_buf);
2766                 usb_free_urb(mos7840_port->control_urb);
2767                 kfree(mos7840_port);
2768                 serial->port[i] = NULL;
2769         }
2770         return status;
2771 }
2772
2773 /****************************************************************************
2774  * mos7840_shutdown
2775  *      This function is called whenever the device is removed from the usb bus.
2776  ****************************************************************************/
2777
2778 static void mos7840_shutdown(struct usb_serial *serial)
2779 {
2780         int i;
2781         unsigned long flags;
2782         struct moschip_port *mos7840_port;
2783         dbg("%s \n", " shutdown :entering..........");
2784
2785         if (!serial) {
2786                 dbg("%s", "Invalid Handler \n");
2787                 return;
2788         }
2789
2790         /*      check for the ports to be closed,close the ports and disconnect         */
2791
2792         /* free private structure allocated for serial port  *
2793          * stop reads and writes on all ports                */
2794
2795         for (i = 0; i < serial->num_ports; ++i) {
2796                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2797                 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2798                 mos7840_port->zombie = 1;
2799                 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2800                 usb_kill_urb(mos7840_port->control_urb);
2801                 kfree(mos7840_port->ctrl_buf);
2802                 kfree(mos7840_port->dr);
2803                 kfree(mos7840_port);
2804                 mos7840_set_port_private(serial->port[i], NULL);
2805         }
2806
2807         dbg("%s\n", "Thank u :: ");
2808
2809 }
2810
2811 static struct usb_driver io_driver = {
2812         .name = "mos7840",
2813         .probe = usb_serial_probe,
2814         .disconnect = usb_serial_disconnect,
2815         .id_table = moschip_id_table_combined,
2816         .no_dynamic_id = 1,
2817 };
2818
2819 static struct usb_serial_driver moschip7840_4port_device = {
2820         .driver = {
2821                    .owner = THIS_MODULE,
2822                    .name = "mos7840",
2823                    },
2824         .description = DRIVER_DESC,
2825         .usb_driver = &io_driver,
2826         .id_table = moschip_port_id_table,
2827         .num_interrupt_in = 1,  //NUM_DONT_CARE,//1,
2828 #ifdef check
2829         .num_bulk_in = 4,
2830         .num_bulk_out = 4,
2831         .num_ports = 4,
2832 #endif
2833         .open = mos7840_open,
2834         .close = mos7840_close,
2835         .write = mos7840_write,
2836         .write_room = mos7840_write_room,
2837         .chars_in_buffer = mos7840_chars_in_buffer,
2838         .throttle = mos7840_throttle,
2839         .unthrottle = mos7840_unthrottle,
2840         .calc_num_ports = mos7840_calc_num_ports,
2841 #ifdef MCSSerialProbe
2842         .probe = mos7840_serial_probe,
2843 #endif
2844         .ioctl = mos7840_ioctl,
2845         .set_termios = mos7840_set_termios,
2846         .break_ctl = mos7840_break,
2847         .tiocmget = mos7840_tiocmget,
2848         .tiocmset = mos7840_tiocmset,
2849         .attach = mos7840_startup,
2850         .shutdown = mos7840_shutdown,
2851         .read_bulk_callback = mos7840_bulk_in_callback,
2852         .read_int_callback = mos7840_interrupt_callback,
2853 };
2854
2855 /****************************************************************************
2856  * moschip7840_init
2857  *      This is called by the module subsystem, or on startup to initialize us
2858  ****************************************************************************/
2859 static int __init moschip7840_init(void)
2860 {
2861         int retval;
2862
2863         dbg("%s \n", " mos7840_init :entering..........");
2864
2865         /* Register with the usb serial */
2866         retval = usb_serial_register(&moschip7840_4port_device);
2867
2868         if (retval)
2869                 goto failed_port_device_register;
2870
2871         dbg("%s\n", "Entring...");
2872         info(DRIVER_DESC " " DRIVER_VERSION);
2873
2874         /* Register with the usb */
2875         retval = usb_register(&io_driver);
2876
2877         if (retval)
2878                 goto failed_usb_register;
2879
2880         if (retval == 0) {
2881                 dbg("%s\n", "Leaving...");
2882                 return 0;
2883         }
2884
2885       failed_usb_register:
2886         usb_serial_deregister(&moschip7840_4port_device);
2887
2888       failed_port_device_register:
2889
2890         return retval;
2891 }
2892
2893 /****************************************************************************
2894  * moschip7840_exit
2895  *      Called when the driver is about to be unloaded.
2896  ****************************************************************************/
2897 static void __exit moschip7840_exit(void)
2898 {
2899
2900         dbg("%s \n", " mos7840_exit :entering..........");
2901
2902         usb_deregister(&io_driver);
2903
2904         usb_serial_deregister(&moschip7840_4port_device);
2905
2906         dbg("%s\n", "Entring...");
2907 }
2908
2909 module_init(moschip7840_init);
2910 module_exit(moschip7840_exit);
2911
2912 /* Module information */
2913 MODULE_DESCRIPTION(DRIVER_DESC);
2914 MODULE_LICENSE("GPL");
2915
2916 module_param(debug, bool, S_IRUGO | S_IWUSR);
2917 MODULE_PARM_DESC(debug, "Debug enabled or not");