drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.1"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 106 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 /* The native mos7840/7820 component */
 114 #define USB_VENDOR_ID_MOSCHIP           0x9710
 115 #define MOSCHIP_DEVICE_ID_7840          0x7840
 116 #define MOSCHIP_DEVICE_ID_7820          0x7820
 117 /* The native component can have its vendor/device id's overridden
 118  * in vendor-specific implementations.  Such devices can be handled
 119  * by making a change here, in moschip_port_id_table, and in
 120  * moschip_id_table_combined
 121  */
 122 #define USB_VENDOR_ID_BANDB             0x0856
 123 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 124 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 125
 126 /* Interrupt Routine Defines    */
 127
 128 #define SERIAL_IIR_RLS      0x06
 129 #define SERIAL_IIR_MS       0x00
 130
 131 /*
 132  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 133  */
 134 #define SERIAL_LSR_DR       0x0001
 135 #define SERIAL_LSR_OE       0x0002
 136 #define SERIAL_LSR_PE       0x0004
 137 #define SERIAL_LSR_FE       0x0008
 138 #define SERIAL_LSR_BI       0x0010
 139
 140 #define MOS_MSR_DELTA_CTS   0x10
 141 #define MOS_MSR_DELTA_DSR   0x20
 142 #define MOS_MSR_DELTA_RI    0x40
 143 #define MOS_MSR_DELTA_CD    0x80
 144
 145 /* Serial Port register Address */
 146 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 147 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 148 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 149 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 150 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 151 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 152 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 153 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 154 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 155
 156 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 157 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 158
 159 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 160
 161 /*
 162  * URB POOL related defines
 163  */
 164 #define NUM_URBS                        16      /* URB Count */
 165 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 166
 167
 168 static struct usb_device_id moschip_port_id_table[] = {
 169         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 170         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 171         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 172         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 173         {}                      /* terminating entry */
 174 };
 175
 176 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 177         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 178         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 179         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 180         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 181         {}                      /* terminating entry */
 182 };
 183
 184 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 185
 186 /* This structure holds all of the local port information */
 187
 188 struct moschip_port {
 189         int port_num;           /*Actual port number in the device(1,2,etc) */
 190         struct urb *write_urb;  /* write URB for this port */
 191         struct urb *read_urb;   /* read URB for this port */
 192         struct urb *int_urb;
 193         __u8 shadowLCR;         /* last LCR value received */
 194         __u8 shadowMCR;         /* last MCR value received */
 195         char open;
 196         char open_ports;
 197         char zombie;
 198         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 199         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 200         int delta_msr_cond;
 201         struct async_icount icount;
 202         struct usb_serial_port *port;   /* loop back to the owner of this object */
 203
 204         /* Offsets */
 205         __u8 SpRegOffset;
 206         __u8 ControlRegOffset;
 207         __u8 DcrRegOffset;
 208         /* for processing control URBS in interrupt context */
 209         struct urb *control_urb;
 210         struct usb_ctrlrequest *dr;
 211         char *ctrl_buf;
 212         int MsrLsr;
 213
 214         spinlock_t pool_lock;
 215         struct urb *write_urb_pool[NUM_URBS];
 216         char busy[NUM_URBS];
 217 };
 218
 219
 220 static int debug;
 221
 222 /*
 223  * mos7840_set_reg_sync
 224  *      To set the Control register by calling usb_fill_control_urb function
 225  *      by passing usb_sndctrlpipe function as parameter.
 226  */
 227
 228 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 229                                 __u16 val)
 230 {
 231         struct usb_device *dev = port->serial->dev;
 232         val = val & 0x00ff;
 233         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 234
 235         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 236                                MCS_WR_RTYPE, val, reg, NULL, 0,
 237                                MOS_WDR_TIMEOUT);
 238 }
 239
 240 /*
 241  * mos7840_get_reg_sync
 242  *      To set the Uart register by calling usb_fill_control_urb function by
 243  *      passing usb_rcvctrlpipe function as parameter.
 244  */
 245
 246 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 247                                 __u16 *val)
 248 {
 249         struct usb_device *dev = port->serial->dev;
 250         int ret = 0;
 251
 252         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 253                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 254                               MOS_WDR_TIMEOUT);
 255         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 256         *val = (*val) & 0x00ff;
 257         return ret;
 258 }
 259
 260 /*
 261  * mos7840_set_uart_reg
 262  *      To set the Uart register by calling usb_fill_control_urb function by
 263  *      passing usb_sndctrlpipe function as parameter.
 264  */
 265
 266 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 267                                 __u16 val)
 268 {
 269
 270         struct usb_device *dev = port->serial->dev;
 271         val = val & 0x00ff;
 272         /* For the UART control registers, the application number need
 273            to be Or'ed */
 274         if (port->serial->num_ports == 4) {
 275                 val |= (((__u16) port->number -
 276                                 (__u16) (port->serial->minor)) + 1) << 8;
 277                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 278         } else {
 279                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 280                         val |= (((__u16) port->number -
 281                               (__u16) (port->serial->minor)) + 1) << 8;
 282                         dbg("mos7840_set_uart_reg application number is %x\n",
 283                             val);
 284                 } else {
 285                         val |=
 286                             (((__u16) port->number -
 287                               (__u16) (port->serial->minor)) + 2) << 8;
 288                         dbg("mos7840_set_uart_reg application number is %x\n",
 289                             val);
 290                 }
 291         }
 292         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 293                                MCS_WR_RTYPE, val, reg, NULL, 0,
 294                                MOS_WDR_TIMEOUT);
 295
 296 }
 297
 298 /*
 299  * mos7840_get_uart_reg
 300  *      To set the Control register by calling usb_fill_control_urb function
 301  *      by passing usb_rcvctrlpipe function as parameter.
 302  */
 303 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 304                                 __u16 *val)
 305 {
 306         struct usb_device *dev = port->serial->dev;
 307         int ret = 0;
 308         __u16 Wval;
 309
 310         /* dbg("application number is %4x \n",
 311             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 312         /* Wval  is same as application number */
 313         if (port->serial->num_ports == 4) {
 314                 Wval =
 315                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 316                      1) << 8;
 317                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 318         } else {
 319                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 320                         Wval = (((__u16) port->number -
 321                               (__u16) (port->serial->minor)) + 1) << 8;
 322                         dbg("mos7840_get_uart_reg application number is %x\n",
 323                             Wval);
 324                 } else {
 325                         Wval = (((__u16) port->number -
 326                               (__u16) (port->serial->minor)) + 2) << 8;
 327                         dbg("mos7840_get_uart_reg application number is %x\n",
 328                             Wval);
 329                 }
 330         }
 331         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 332                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 333                               MOS_WDR_TIMEOUT);
 334         *val = (*val) & 0x00ff;
 335         return ret;
 336 }
 337
 338 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 339 {
 340
 341         dbg("***************************************\n");
 342         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 343         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 344         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 345         dbg("***************************************\n");
 346
 347 }
 348
 349 /************************************************************************/
 350 /************************************************************************/
 351 /*             I N T E R F A C E   F U N C T I O N S                    */
 352 /*             I N T E R F A C E   F U N C T I O N S                    */
 353 /************************************************************************/
 354 /************************************************************************/
 355
 356 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 357                                             struct moschip_port *data)
 358 {
 359         usb_set_serial_port_data(port, (void *)data);
 360 }
 361
 362 static inline struct moschip_port *mos7840_get_port_private(struct
 363                                                             usb_serial_port
 364                                                             *port)
 365 {
 366         return (struct moschip_port *)usb_get_serial_port_data(port);
 367 }
 368
 369 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 370 {
 371         struct moschip_port *mos7840_port;
 372         struct async_icount *icount;
 373         mos7840_port = port;
 374         icount = &mos7840_port->icount;
 375         if (new_msr &
 376             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 377              MOS_MSR_DELTA_CD)) {
 378                 icount = &mos7840_port->icount;
 379
 380                 /* update input line counters */
 381                 if (new_msr & MOS_MSR_DELTA_CTS) {
 382                         icount->cts++;
 383                         smp_wmb();
 384                 }
 385                 if (new_msr & MOS_MSR_DELTA_DSR) {
 386                         icount->dsr++;
 387                         smp_wmb();
 388                 }
 389                 if (new_msr & MOS_MSR_DELTA_CD) {
 390                         icount->dcd++;
 391                         smp_wmb();
 392                 }
 393                 if (new_msr & MOS_MSR_DELTA_RI) {
 394                         icount->rng++;
 395                         smp_wmb();
 396                 }
 397         }
 398 }
 399
 400 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 401 {
 402         struct async_icount *icount;
 403
 404         dbg("%s - %02x", __func__, new_lsr);
 405
 406         if (new_lsr & SERIAL_LSR_BI) {
 407                 /*
 408                  * Parity and Framing errors only count if they
 409                  * occur exclusive of a break being
 410                  * received.
 411                  */
 412                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 413         }
 414
 415         /* update input line counters */
 416         icount = &port->icount;
 417         if (new_lsr & SERIAL_LSR_BI) {
 418                 icount->brk++;
 419                 smp_wmb();
 420         }
 421         if (new_lsr & SERIAL_LSR_OE) {
 422                 icount->overrun++;
 423                 smp_wmb();
 424         }
 425         if (new_lsr & SERIAL_LSR_PE) {
 426                 icount->parity++;
 427                 smp_wmb();
 428         }
 429         if (new_lsr & SERIAL_LSR_FE) {
 430                 icount->frame++;
 431                 smp_wmb();
 432         }
 433 }
 434
 435 /************************************************************************/
 436 /************************************************************************/
 437 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 438 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 439 /************************************************************************/
 440 /************************************************************************/
 441
 442 static void mos7840_control_callback(struct urb *urb)
 443 {
 444         unsigned char *data;
 445         struct moschip_port *mos7840_port;
 446         __u8 regval = 0x0;
 447         int result = 0;
 448         int status = urb->status;
 449
 450         mos7840_port = urb->context;
 451
 452         switch (status) {
 453         case 0:
 454                 /* success */
 455                 break;
 456         case -ECONNRESET:
 457         case -ENOENT:
 458         case -ESHUTDOWN:
 459                 /* this urb is terminated, clean up */
 460                 dbg("%s - urb shutting down with status: %d", __func__,
 461                     status);
 462                 return;
 463         default:
 464                 dbg("%s - nonzero urb status received: %d", __func__,
 465                     status);
 466                 goto exit;
 467         }
 468
 469         dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
 470         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 471             mos7840_port->MsrLsr, mos7840_port->port_num);
 472         data = urb->transfer_buffer;
 473         regval = (__u8) data[0];
 474         dbg("%s data is %x\n", __func__, regval);
 475         if (mos7840_port->MsrLsr == 0)
 476                 mos7840_handle_new_msr(mos7840_port, regval);
 477         else if (mos7840_port->MsrLsr == 1)
 478                 mos7840_handle_new_lsr(mos7840_port, regval);
 479
 480 exit:
 481         spin_lock(&mos7840_port->pool_lock);
 482         if (!mos7840_port->zombie)
 483                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 484         spin_unlock(&mos7840_port->pool_lock);
 485         if (result) {
 486                 dev_err(&urb->dev->dev,
 487                         "%s - Error %d submitting interrupt urb\n",
 488                         __func__, result);
 489         }
 490 }
 491
 492 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 493                            __u16 *val)
 494 {
 495         struct usb_device *dev = mcs->port->serial->dev;
 496         struct usb_ctrlrequest *dr = mcs->dr;
 497         unsigned char *buffer = mcs->ctrl_buf;
 498         int ret;
 499
 500         dr->bRequestType = MCS_RD_RTYPE;
 501         dr->bRequest = MCS_RDREQ;
 502         dr->wValue = cpu_to_le16(Wval); /* 0 */
 503         dr->wIndex = cpu_to_le16(reg);
 504         dr->wLength = cpu_to_le16(2);
 505
 506         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 507                              (unsigned char *)dr, buffer, 2,
 508                              mos7840_control_callback, mcs);
 509         mcs->control_urb->transfer_buffer_length = 2;
 510         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 511         return ret;
 512 }
 513
 514 /*****************************************************************************
 515  * mos7840_interrupt_callback
 516  *      this is the callback function for when we have received data on the
 517  *      interrupt endpoint.
 518  *****************************************************************************/
 519
 520 static void mos7840_interrupt_callback(struct urb *urb)
 521 {
 522         int result;
 523         int length;
 524         struct moschip_port *mos7840_port;
 525         struct usb_serial *serial;
 526         __u16 Data;
 527         unsigned char *data;
 528         __u8 sp[5], st;
 529         int i, rv = 0;
 530         __u16 wval, wreg = 0;
 531         int status = urb->status;
 532
 533         dbg("%s", " : Entering\n");
 534
 535         switch (status) {
 536         case 0:
 537                 /* success */
 538                 break;
 539         case -ECONNRESET:
 540         case -ENOENT:
 541         case -ESHUTDOWN:
 542                 /* this urb is terminated, clean up */
 543                 dbg("%s - urb shutting down with status: %d", __func__,
 544                     status);
 545                 return;
 546         default:
 547                 dbg("%s - nonzero urb status received: %d", __func__,
 548                     status);
 549                 goto exit;
 550         }
 551
 552         length = urb->actual_length;
 553         data = urb->transfer_buffer;
 554
 555         serial = urb->context;
 556
 557         /* Moschip get 5 bytes
 558          * Byte 1 IIR Port 1 (port.number is 0)
 559          * Byte 2 IIR Port 2 (port.number is 1)
 560          * Byte 3 IIR Port 3 (port.number is 2)
 561          * Byte 4 IIR Port 4 (port.number is 3)
 562          * Byte 5 FIFO status for both */
 563
 564         if (length && length > 5) {
 565                 dbg("%s \n", "Wrong data !!!");
 566                 return;
 567         }
 568
 569         sp[0] = (__u8) data[0];
 570         sp[1] = (__u8) data[1];
 571         sp[2] = (__u8) data[2];
 572         sp[3] = (__u8) data[3];
 573         st = (__u8) data[4];
 574
 575         for (i = 0; i < serial->num_ports; i++) {
 576                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 577                 wval =
 578                     (((__u16) serial->port[i]->number -
 579                       (__u16) (serial->minor)) + 1) << 8;
 580                 if (mos7840_port->open) {
 581                         if (sp[i] & 0x01) {
 582                                 dbg("SP%d No Interrupt !!!\n", i);
 583                         } else {
 584                                 switch (sp[i] & 0x0f) {
 585                                 case SERIAL_IIR_RLS:
 586                                         dbg("Serial Port %d: Receiver status error or ", i);
 587                                         dbg("address bit detected in 9-bit mode\n");
 588                                         mos7840_port->MsrLsr = 1;
 589                                         wreg = LINE_STATUS_REGISTER;
 590                                         break;
 591                                 case SERIAL_IIR_MS:
 592                                         dbg("Serial Port %d: Modem status change\n", i);
 593                                         mos7840_port->MsrLsr = 0;
 594                                         wreg = MODEM_STATUS_REGISTER;
 595                                         break;
 596                                 }
 597                                 spin_lock(&mos7840_port->pool_lock);
 598                                 if (!mos7840_port->zombie) {
 599                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 600                                 } else {
 601                                         spin_unlock(&mos7840_port->pool_lock);
 602                                         return;
 603                                 }
 604                                 spin_unlock(&mos7840_port->pool_lock);
 605                         }
 606                 }
 607         }
 608         if (!(rv < 0))
 609                 /* the completion handler for the control urb will resubmit */
 610                 return;
 611 exit:
 612         result = usb_submit_urb(urb, GFP_ATOMIC);
 613         if (result) {
 614                 dev_err(&urb->dev->dev,
 615                         "%s - Error %d submitting interrupt urb\n",
 616                         __func__, result);
 617         }
 618 }
 619
 620 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 621                                        const char *function)
 622 {
 623         if (!port) {
 624                 dbg("%s - port == NULL", function);
 625                 return -1;
 626         }
 627         if (!port->serial) {
 628                 dbg("%s - port->serial == NULL", function);
 629                 return -1;
 630         }
 631
 632         return 0;
 633 }
 634
 635 /* Inline functions to check the sanity of a pointer that is passed to us */
 636 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 637                                          const char *function)
 638 {
 639         if (!serial) {
 640                 dbg("%s - serial == NULL", function);
 641                 return -1;
 642         }
 643         if (!serial->type) {
 644                 dbg("%s - serial->type == NULL!", function);
 645                 return -1;
 646         }
 647
 648         return 0;
 649 }
 650
 651 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 652                                                  const char *function)
 653 {
 654         /* if no port was specified, or it fails a paranoia check */
 655         if (!port ||
 656             mos7840_port_paranoia_check(port, function) ||
 657             mos7840_serial_paranoia_check(port->serial, function)) {
 658                 /* then say that we don't have a valid usb_serial thing,
 659                  * which will end up genrating -ENODEV return values */
 660                 return NULL;
 661         }
 662
 663         return port->serial;
 664 }
 665
 666 /*****************************************************************************
 667  * mos7840_bulk_in_callback
 668  *      this is the callback function for when we have received data on the
 669  *      bulk in endpoint.
 670  *****************************************************************************/
 671
 672 static void mos7840_bulk_in_callback(struct urb *urb)
 673 {
 674         int retval;
 675         unsigned char *data;
 676         struct usb_serial *serial;
 677         struct usb_serial_port *port;
 678         struct moschip_port *mos7840_port;
 679         struct tty_struct *tty;
 680         int status = urb->status;
 681
 682         if (status) {
 683                 dbg("nonzero read bulk status received: %d", status);
 684                 return;
 685         }
 686
 687         mos7840_port = urb->context;
 688         if (!mos7840_port) {
 689                 dbg("%s", "NULL mos7840_port pointer \n");
 690                 return;
 691         }
 692
 693         port = (struct usb_serial_port *)mos7840_port->port;
 694         if (mos7840_port_paranoia_check(port, __func__)) {
 695                 dbg("%s", "Port Paranoia failed \n");
 696                 return;
 697         }
 698
 699         serial = mos7840_get_usb_serial(port, __func__);
 700         if (!serial) {
 701                 dbg("%s\n", "Bad serial pointer ");
 702                 return;
 703         }
 704
 705         dbg("%s\n", "Entering... \n");
 706
 707         data = urb->transfer_buffer;
 708
 709         dbg("%s", "Entering ........... \n");
 710
 711         if (urb->actual_length) {
 712                 tty = tty_port_tty_get(&mos7840_port->port->port);
 713                 if (tty) {
 714                         tty_buffer_request_room(tty, urb->actual_length);
 715                         tty_insert_flip_string(tty, data, urb->actual_length);
 716                         dbg(" %s \n", data);
 717                         tty_flip_buffer_push(tty);
 718                         tty_kref_put(tty);
 719                 }
 720                 mos7840_port->icount.rx += urb->actual_length;
 721                 smp_wmb();
 722                 dbg("mos7840_port->icount.rx is %d:\n",
 723                     mos7840_port->icount.rx);
 724         }
 725
 726         if (!mos7840_port->read_urb) {
 727                 dbg("%s", "URB KILLED !!!\n");
 728                 return;
 729         }
 730
 731
 732         mos7840_port->read_urb->dev = serial->dev;
 733
 734         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 735
 736         if (retval) {
 737                 dbg(" usb_submit_urb(read bulk) failed, retval = %d",
 738                  retval);
 739         }
 740 }
 741
 742 /*****************************************************************************
 743  * mos7840_bulk_out_data_callback
 744  *      this is the callback function for when we have finished sending
 745  *      serial data on the bulk out endpoint.
 746  *****************************************************************************/
 747
 748 static void mos7840_bulk_out_data_callback(struct urb *urb)
 749 {
 750         struct moschip_port *mos7840_port;
 751         struct tty_struct *tty;
 752         int status = urb->status;
 753         int i;
 754
 755         mos7840_port = urb->context;
 756         spin_lock(&mos7840_port->pool_lock);
 757         for (i = 0; i < NUM_URBS; i++) {
 758                 if (urb == mos7840_port->write_urb_pool[i]) {
 759                         mos7840_port->busy[i] = 0;
 760                         break;
 761                 }
 762         }
 763         spin_unlock(&mos7840_port->pool_lock);
 764
 765         if (status) {
 766                 dbg("nonzero write bulk status received:%d\n", status);
 767                 return;
 768         }
 769
 770         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 771                 dbg("%s", "Port Paranoia failed \n");
 772                 return;
 773         }
 774
 775         dbg("%s \n", "Entering .........");
 776
 777         tty = tty_port_tty_get(&mos7840_port->port->port);
 778         if (tty && mos7840_port->open)
 779                 tty_wakeup(tty);
 780         tty_kref_put(tty);
 781
 782 }
 783
 784 /************************************************************************/
 785 /*       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       */
 786 /************************************************************************/
 787 #ifdef MCSSerialProbe
 788 static int mos7840_serial_probe(struct usb_serial *serial,
 789                                 const struct usb_device_id *id)
 790 {
 791
 792         /*need to implement the mode_reg reading and updating\
 793            structures usb_serial_ device_type\
 794            (i.e num_ports, num_bulkin,bulkout etc) */
 795         /* Also we can update the changes  attach */
 796         return 1;
 797 }
 798 #endif
 799
 800 /*****************************************************************************
 801  * mos7840_open
 802  *      this function is called by the tty driver when a port is opened
 803  *      If successful, we return 0
 804  *      Otherwise we return a negative error number.
 805  *****************************************************************************/
 806
 807 static int mos7840_open(struct tty_struct *tty,
 808                         struct usb_serial_port *port, struct file *filp)
 809 {
 810         int response;
 811         int j;
 812         struct usb_serial *serial;
 813         struct urb *urb;
 814         __u16 Data;
 815         int status;
 816         struct moschip_port *mos7840_port;
 817         struct moschip_port *port0;
 818
 819         if (mos7840_port_paranoia_check(port, __func__)) {
 820                 dbg("%s", "Port Paranoia failed \n");
 821                 return -ENODEV;
 822         }
 823
 824         serial = port->serial;
 825
 826         if (mos7840_serial_paranoia_check(serial, __func__)) {
 827                 dbg("%s", "Serial Paranoia failed \n");
 828                 return -ENODEV;
 829         }
 830
 831         mos7840_port = mos7840_get_port_private(port);
 832         port0 = mos7840_get_port_private(serial->port[0]);
 833
 834         if (mos7840_port == NULL || port0 == NULL)
 835                 return -ENODEV;
 836
 837         usb_clear_halt(serial->dev, port->write_urb->pipe);
 838         usb_clear_halt(serial->dev, port->read_urb->pipe);
 839         port0->open_ports++;
 840
 841         /* Initialising the write urb pool */
 842         for (j = 0; j < NUM_URBS; ++j) {
 843                 urb = usb_alloc_urb(0, GFP_KERNEL);
 844                 mos7840_port->write_urb_pool[j] = urb;
 845
 846                 if (urb == NULL) {
 847                         dev_err(&port->dev, "No more urbs???\n");
 848                         continue;
 849                 }
 850
 851                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 852                                                                 GFP_KERNEL);
 853                 if (!urb->transfer_buffer) {
 854                         usb_free_urb(urb);
 855                         mos7840_port->write_urb_pool[j] = NULL;
 856                         dev_err(&port->dev,
 857                                 "%s-out of memory for urb buffers.\n",
 858                                 __func__);
 859                         continue;
 860                 }
 861         }
 862
 863 /*****************************************************************************
 864  * Initialize MCS7840 -- Write Init values to corresponding Registers
 865  *
 866  * Register Index
 867  * 1 : IER
 868  * 2 : FCR
 869  * 3 : LCR
 870  * 4 : MCR
 871  *
 872  * 0x08 : SP1/2 Control Reg
 873  *****************************************************************************/
 874
 875         /* NEED to check the following Block */
 876
 877         Data = 0x0;
 878         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 879         if (status < 0) {
 880                 dbg("Reading Spreg failed\n");
 881                 return -1;
 882         }
 883         Data |= 0x80;
 884         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 885         if (status < 0) {
 886                 dbg("writing Spreg failed\n");
 887                 return -1;
 888         }
 889
 890         Data &= ~0x80;
 891         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 892         if (status < 0) {
 893                 dbg("writing Spreg failed\n");
 894                 return -1;
 895         }
 896         /* End of block to be checked */
 897
 898         Data = 0x0;
 899         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 900                                                                         &Data);
 901         if (status < 0) {
 902                 dbg("Reading Controlreg failed\n");
 903                 return -1;
 904         }
 905         Data |= 0x08;           /* Driver done bit */
 906         Data |= 0x20;           /* rx_disable */
 907         status = mos7840_set_reg_sync(port,
 908                                 mos7840_port->ControlRegOffset, Data);
 909         if (status < 0) {
 910                 dbg("writing Controlreg failed\n");
 911                 return -1;
 912         }
 913         /* do register settings here */
 914         /* Set all regs to the device default values. */
 915         /***********************************
 916          * First Disable all interrupts.
 917          ***********************************/
 918         Data = 0x00;
 919         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 920         if (status < 0) {
 921                 dbg("disableing interrupts failed\n");
 922                 return -1;
 923         }
 924         /* Set FIFO_CONTROL_REGISTER to the default value */
 925         Data = 0x00;
 926         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 927         if (status < 0) {
 928                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 929                 return -1;
 930         }
 931
 932         Data = 0xcf;
 933         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 934         if (status < 0) {
 935                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 936                 return -1;
 937         }
 938
 939         Data = 0x03;
 940         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 941         mos7840_port->shadowLCR = Data;
 942
 943         Data = 0x0b;
 944         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 945         mos7840_port->shadowMCR = Data;
 946
 947         Data = 0x00;
 948         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 949         mos7840_port->shadowLCR = Data;
 950
 951         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 952         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 953
 954         Data = 0x0c;
 955         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 956
 957         Data = 0x0;
 958         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 959
 960         Data = 0x00;
 961         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 962
 963         Data = Data & ~SERIAL_LCR_DLAB;
 964         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 965         mos7840_port->shadowLCR = Data;
 966
 967         /* clearing Bulkin and Bulkout Fifo */
 968         Data = 0x0;
 969         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 970
 971         Data = Data | 0x0c;
 972         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 973
 974         Data = Data & ~0x0c;
 975         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 976         /* Finally enable all interrupts */
 977         Data = 0x0c;
 978         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 979
 980         /* clearing rx_disable */
 981         Data = 0x0;
 982         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 983                                                                         &Data);
 984         Data = Data & ~0x20;
 985         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
 986                                                                         Data);
 987
 988         /* rx_negate */
 989         Data = 0x0;
 990         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 991                                                                         &Data);
 992         Data = Data | 0x10;
 993         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
 994                                                                         Data);
 995
 996         /* force low_latency on so that our tty_push actually forces *
 997          * the data through,otherwise it is scheduled, and with      *
 998          * high data rates (like with OHCI) data can get lost.       */
 999         if (tty)
1000                 tty->low_latency = 1;
1001
1002         /* Check to see if we've set up our endpoint info yet    *
1003          * (can't set it up in mos7840_startup as the structures *
1004          * were not set up at that time.)                        */
1005         if (port0->open_ports == 1) {
1006                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1007                         /* set up interrupt urb */
1008                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1009                                 serial->dev,
1010                                 usb_rcvintpipe(serial->dev,
1011                                 serial->port[0]->interrupt_in_endpointAddress),
1012                                 serial->port[0]->interrupt_in_buffer,
1013                                 serial->port[0]->interrupt_in_urb->
1014                                 transfer_buffer_length,
1015                                 mos7840_interrupt_callback,
1016                                 serial,
1017                                 serial->port[0]->interrupt_in_urb->interval);
1018
1019                         /* start interrupt read for mos7840               *
1020                          * will continue as long as mos7840 is connected  */
1021
1022                         response =
1023                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1024                                            GFP_KERNEL);
1025                         if (response) {
1026                                 dev_err(&port->dev, "%s - Error %d submitting "
1027                                         "interrupt urb\n", __func__, response);
1028                         }
1029
1030                 }
1031
1032         }
1033
1034         /* see if we've set up our endpoint info yet   *
1035          * (can't set it up in mos7840_startup as the  *
1036          * structures were not set up at that time.)   */
1037
1038         dbg("port number is %d \n", port->number);
1039         dbg("serial number is %d \n", port->serial->minor);
1040         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1041         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1042         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1043         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1044         mos7840_port->read_urb = port->read_urb;
1045
1046         /* set up our bulk in urb */
1047
1048         usb_fill_bulk_urb(mos7840_port->read_urb,
1049                           serial->dev,
1050                           usb_rcvbulkpipe(serial->dev,
1051                                           port->bulk_in_endpointAddress),
1052                           port->bulk_in_buffer,
1053                           mos7840_port->read_urb->transfer_buffer_length,
1054                           mos7840_bulk_in_callback, mos7840_port);
1055
1056         dbg("mos7840_open: bulkin endpoint is %d\n",
1057             port->bulk_in_endpointAddress);
1058         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1059         if (response) {
1060                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1061                         __func__, response);
1062         }
1063
1064         /* initialize our wait queues */
1065         init_waitqueue_head(&mos7840_port->wait_chase);
1066         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1067
1068         /* initialize our icount structure */
1069         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1070
1071         /* initialize our port settings */
1072         /* Must set to enable ints! */
1073         mos7840_port->shadowMCR = MCR_MASTER_IE;
1074         /* send a open port command */
1075         mos7840_port->open = 1;
1076         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1077         mos7840_port->icount.tx = 0;
1078         mos7840_port->icount.rx = 0;
1079
1080         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n",
1081                                 serial, mos7840_port, port);
1082
1083         return 0;
1084
1085 }
1086
1087 /*****************************************************************************
1088  * mos7840_chars_in_buffer
1089  *      this function is called by the tty driver when it wants to know how many
1090  *      bytes of data we currently have outstanding in the port (data that has
1091  *      been written, but hasn't made it out the port yet)
1092  *      If successful, we return the number of bytes left to be written in the
1093  *      system,
1094  *      Otherwise we return zero.
1095  *****************************************************************************/
1096
1097 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1098 {
1099         struct usb_serial_port *port = tty->driver_data;
1100         int i;
1101         int chars = 0;
1102         unsigned long flags;
1103         struct moschip_port *mos7840_port;
1104
1105         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1106
1107         if (mos7840_port_paranoia_check(port, __func__)) {
1108                 dbg("%s", "Invalid port \n");
1109                 return 0;
1110         }
1111
1112         mos7840_port = mos7840_get_port_private(port);
1113         if (mos7840_port == NULL) {
1114                 dbg("%s \n", "mos7840_break:leaving ...........");
1115                 return 0;
1116         }
1117
1118         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1119         for (i = 0; i < NUM_URBS; ++i)
1120                 if (mos7840_port->busy[i])
1121                         chars += URB_TRANSFER_BUFFER_SIZE;
1122         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1123         dbg("%s - returns %d", __func__, chars);
1124         return chars;
1125
1126 }
1127
1128 /************************************************************************
1129  *
1130  * mos7840_block_until_tx_empty
1131  *
1132  *      This function will block the close until one of the following:
1133  *              1. TX count are 0
1134  *              2. The mos7840 has stopped
1135  *              3. A timeout of 3 seconds without activity has expired
1136  *
1137  ************************************************************************/
1138 static void mos7840_block_until_tx_empty(struct tty_struct *tty,
1139                                 struct moschip_port *mos7840_port)
1140 {
1141         int timeout = HZ / 10;
1142         int wait = 30;
1143         int count;
1144
1145         while (1) {
1146
1147                 count = mos7840_chars_in_buffer(tty);
1148
1149                 /* Check for Buffer status */
1150                 if (count <= 0)
1151                         return;
1152
1153                 /* Block the thread for a while */
1154                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1155                                                timeout);
1156
1157                 /* No activity.. count down section */
1158                 wait--;
1159                 if (wait == 0) {
1160                         dbg("%s - TIMEOUT", __func__);
1161                         return;
1162                 } else {
1163                         /* Reset timeout value back to seconds */
1164                         wait = 30;
1165                 }
1166         }
1167 }
1168
1169 /*****************************************************************************
1170  * mos7840_close
1171  *      this function is called by the tty driver when a port is closed
1172  *****************************************************************************/
1173
1174 static void mos7840_close(struct tty_struct *tty,
1175                         struct usb_serial_port *port, struct file *filp)
1176 {
1177         struct usb_serial *serial;
1178         struct moschip_port *mos7840_port;
1179         struct moschip_port *port0;
1180         int j;
1181         __u16 Data;
1182
1183         dbg("%s\n", "mos7840_close:entering...");
1184
1185         if (mos7840_port_paranoia_check(port, __func__)) {
1186                 dbg("%s", "Port Paranoia failed \n");
1187                 return;
1188         }
1189
1190         serial = mos7840_get_usb_serial(port, __func__);
1191         if (!serial) {
1192                 dbg("%s", "Serial Paranoia failed \n");
1193                 return;
1194         }
1195
1196         mos7840_port = mos7840_get_port_private(port);
1197         port0 = mos7840_get_port_private(serial->port[0]);
1198
1199         if (mos7840_port == NULL || port0 == NULL)
1200                 return;
1201
1202         for (j = 0; j < NUM_URBS; ++j)
1203                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1204
1205         /* Freeing Write URBs */
1206         for (j = 0; j < NUM_URBS; ++j) {
1207                 if (mos7840_port->write_urb_pool[j]) {
1208                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1209                                 kfree(mos7840_port->write_urb_pool[j]->
1210                                       transfer_buffer);
1211
1212                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1213                 }
1214         }
1215
1216         if (serial->dev)
1217                 /* flush and block until tx is empty */
1218                 mos7840_block_until_tx_empty(tty, mos7840_port);
1219
1220         /* While closing port, shutdown all bulk read, write  *
1221          * and interrupt read if they exists                  */
1222         if (serial->dev) {
1223                 if (mos7840_port->write_urb) {
1224                         dbg("%s", "Shutdown bulk write\n");
1225                         usb_kill_urb(mos7840_port->write_urb);
1226                 }
1227                 if (mos7840_port->read_urb) {
1228                         dbg("%s", "Shutdown bulk read\n");
1229                         usb_kill_urb(mos7840_port->read_urb);
1230                 }
1231                 if ((&mos7840_port->control_urb)) {
1232                         dbg("%s", "Shutdown control read\n");
1233                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1234                 }
1235         }
1236 /*      if(mos7840_port->ctrl_buf != NULL) */
1237 /*              kfree(mos7840_port->ctrl_buf); */
1238         port0->open_ports--;
1239         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1240             port0->open_ports, port->number);
1241         if (port0->open_ports == 0) {
1242                 if (serial->port[0]->interrupt_in_urb) {
1243                         dbg("%s", "Shutdown interrupt_in_urb\n");
1244                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1245                 }
1246         }
1247
1248         if (mos7840_port->write_urb) {
1249                 /* if this urb had a transfer buffer already (old tx) free it */
1250                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1251                         kfree(mos7840_port->write_urb->transfer_buffer);
1252                 usb_free_urb(mos7840_port->write_urb);
1253         }
1254
1255         Data = 0x0;
1256         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1257
1258         Data = 0x00;
1259         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1260
1261         mos7840_port->open = 0;
1262
1263         dbg("%s \n", "Leaving ............");
1264 }
1265
1266 /************************************************************************
1267  *
1268  * mos7840_block_until_chase_response
1269  *
1270  *      This function will block the close until one of the following:
1271  *              1. Response to our Chase comes from mos7840
1272  *              2. A timeout of 10 seconds without activity has expired
1273  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1274  *
1275  ************************************************************************/
1276
1277 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1278                                         struct moschip_port *mos7840_port)
1279 {
1280         int timeout = 1 * HZ;
1281         int wait = 10;
1282         int count;
1283
1284         while (1) {
1285                 count = mos7840_chars_in_buffer(tty);
1286
1287                 /* Check for Buffer status */
1288                 if (count <= 0)
1289                         return;
1290
1291                 /* Block the thread for a while */
1292                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1293                                                timeout);
1294                 /* No activity.. count down section */
1295                 wait--;
1296                 if (wait == 0) {
1297                         dbg("%s - TIMEOUT", __func__);
1298                         return;
1299                 } else {
1300                         /* Reset timeout value back to seconds */
1301                         wait = 10;
1302                 }
1303         }
1304
1305 }
1306
1307 /*****************************************************************************
1308  * mos7840_break
1309  *      this function sends a break to the port
1310  *****************************************************************************/
1311 static void mos7840_break(struct tty_struct *tty, int break_state)
1312 {
1313         struct usb_serial_port *port = tty->driver_data;
1314         unsigned char data;
1315         struct usb_serial *serial;
1316         struct moschip_port *mos7840_port;
1317
1318         dbg("%s \n", "Entering ...........");
1319         dbg("mos7840_break: Start\n");
1320
1321         if (mos7840_port_paranoia_check(port, __func__)) {
1322                 dbg("%s", "Port Paranoia failed \n");
1323                 return;
1324         }
1325
1326         serial = mos7840_get_usb_serial(port, __func__);
1327         if (!serial) {
1328                 dbg("%s", "Serial Paranoia failed \n");
1329                 return;
1330         }
1331
1332         mos7840_port = mos7840_get_port_private(port);
1333
1334         if (mos7840_port == NULL)
1335                 return;
1336
1337         if (serial->dev)
1338                 /* flush and block until tx is empty */
1339                 mos7840_block_until_chase_response(tty, mos7840_port);
1340
1341         if (break_state == -1)
1342                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1343         else
1344                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1345
1346         mos7840_port->shadowLCR = data;
1347         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1348             mos7840_port->shadowLCR);
1349         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1350                              mos7840_port->shadowLCR);
1351
1352         return;
1353 }
1354
1355 /*****************************************************************************
1356  * mos7840_write_room
1357  *      this function is called by the tty driver when it wants to know how many
1358  *      bytes of data we can accept for a specific port.
1359  *      If successful, we return the amount of room that we have for this port
1360  *      Otherwise we return a negative error number.
1361  *****************************************************************************/
1362
1363 static int mos7840_write_room(struct tty_struct *tty)
1364 {
1365         struct usb_serial_port *port = tty->driver_data;
1366         int i;
1367         int room = 0;
1368         unsigned long flags;
1369         struct moschip_port *mos7840_port;
1370
1371         dbg("%s \n", " mos7840_write_room:entering ...........");
1372
1373         if (mos7840_port_paranoia_check(port, __func__)) {
1374                 dbg("%s", "Invalid port \n");
1375                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1376                 return -1;
1377         }
1378
1379         mos7840_port = mos7840_get_port_private(port);
1380         if (mos7840_port == NULL) {
1381                 dbg("%s \n", "mos7840_break:leaving ...........");
1382                 return -1;
1383         }
1384
1385         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1386         for (i = 0; i < NUM_URBS; ++i) {
1387                 if (!mos7840_port->busy[i])
1388                         room += URB_TRANSFER_BUFFER_SIZE;
1389         }
1390         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1391
1392         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1393         dbg("%s - returns %d", __func__, room);
1394         return room;
1395
1396 }
1397
1398 /*****************************************************************************
1399  * mos7840_write
1400  *      this function is called by the tty driver when data should be written to
1401  *      the port.
1402  *      If successful, we return the number of bytes written, otherwise we
1403  *      return a negative error number.
1404  *****************************************************************************/
1405
1406 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1407                          const unsigned char *data, int count)
1408 {
1409         int status;
1410         int i;
1411         int bytes_sent = 0;
1412         int transfer_size;
1413         unsigned long flags;
1414
1415         struct moschip_port *mos7840_port;
1416         struct usb_serial *serial;
1417         struct urb *urb;
1418         /* __u16 Data; */
1419         const unsigned char *current_position = data;
1420         unsigned char *data1;
1421         dbg("%s \n", "entering ...........");
1422         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1423                                         mos7840_port->shadowLCR); */
1424
1425 #ifdef NOTMOS7840
1426         Data = 0x00;
1427         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1428         mos7840_port->shadowLCR = Data;
1429         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1430         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1431             mos7840_port->shadowLCR);
1432
1433         /* Data = 0x03; */
1434         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1435         /* mos7840_port->shadowLCR=Data;//Need to add later */
1436
1437         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1438         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1439
1440         /* Data = 0x0c; */
1441         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1442         Data = 0x00;
1443         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1444         dbg("mos7840_write:DLL value is %x\n", Data);
1445
1446         Data = 0x0;
1447         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1448         dbg("mos7840_write:DLM value is %x\n", Data);
1449
1450         Data = Data & ~SERIAL_LCR_DLAB;
1451         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1452             mos7840_port->shadowLCR);
1453         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1454 #endif
1455
1456         if (mos7840_port_paranoia_check(port, __func__)) {
1457                 dbg("%s", "Port Paranoia failed \n");
1458                 return -1;
1459         }
1460
1461         serial = port->serial;
1462         if (mos7840_serial_paranoia_check(serial, __func__)) {
1463                 dbg("%s", "Serial Paranoia failed \n");
1464                 return -1;
1465         }
1466
1467         mos7840_port = mos7840_get_port_private(port);
1468         if (mos7840_port == NULL) {
1469                 dbg("%s", "mos7840_port is NULL\n");
1470                 return -1;
1471         }
1472
1473         /* try to find a free urb in the list */
1474         urb = NULL;
1475
1476         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1477         for (i = 0; i < NUM_URBS; ++i) {
1478                 if (!mos7840_port->busy[i]) {
1479                         mos7840_port->busy[i] = 1;
1480                         urb = mos7840_port->write_urb_pool[i];
1481                         dbg("\nURB:%d", i);
1482                         break;
1483                 }
1484         }
1485         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1486
1487         if (urb == NULL) {
1488                 dbg("%s - no more free urbs", __func__);
1489                 goto exit;
1490         }
1491
1492         if (urb->transfer_buffer == NULL) {
1493                 urb->transfer_buffer =
1494                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1495
1496                 if (urb->transfer_buffer == NULL) {
1497                         dev_err(&port->dev, "%s no more kernel memory...\n",
1498                                 __func__);
1499                         goto exit;
1500                 }
1501         }
1502         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1503
1504         memcpy(urb->transfer_buffer, current_position, transfer_size);
1505
1506         /* fill urb with data and submit  */
1507         usb_fill_bulk_urb(urb,
1508                           serial->dev,
1509                           usb_sndbulkpipe(serial->dev,
1510                                           port->bulk_out_endpointAddress),
1511                           urb->transfer_buffer,
1512                           transfer_size,
1513                           mos7840_bulk_out_data_callback, mos7840_port);
1514
1515         data1 = urb->transfer_buffer;
1516         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1517
1518         /* send it down the pipe */
1519         status = usb_submit_urb(urb, GFP_ATOMIC);
1520
1521         if (status) {
1522                 mos7840_port->busy[i] = 0;
1523                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1524                         "with status = %d\n", __func__, status);
1525                 bytes_sent = status;
1526                 goto exit;
1527         }
1528         bytes_sent = transfer_size;
1529         mos7840_port->icount.tx += transfer_size;
1530         smp_wmb();
1531         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1532 exit:
1533         return bytes_sent;
1534
1535 }
1536
1537 /*****************************************************************************
1538  * mos7840_throttle
1539  *      this function is called by the tty driver when it wants to stop the data
1540  *      being read from the port.
1541  *****************************************************************************/
1542
1543 static void mos7840_throttle(struct tty_struct *tty)
1544 {
1545         struct usb_serial_port *port = tty->driver_data;
1546         struct moschip_port *mos7840_port;
1547         int status;
1548
1549         if (mos7840_port_paranoia_check(port, __func__)) {
1550                 dbg("%s", "Invalid port \n");
1551                 return;
1552         }
1553
1554         dbg("- port %d\n", port->number);
1555
1556         mos7840_port = mos7840_get_port_private(port);
1557
1558         if (mos7840_port == NULL)
1559                 return;
1560
1561         if (!mos7840_port->open) {
1562                 dbg("%s\n", "port not opened");
1563                 return;
1564         }
1565
1566         dbg("%s", "Entering .......... \n");
1567
1568         /* if we are implementing XON/XOFF, send the stop character */
1569         if (I_IXOFF(tty)) {
1570                 unsigned char stop_char = STOP_CHAR(tty);
1571                 status = mos7840_write(tty, port, &stop_char, 1);
1572                 if (status <= 0)
1573                         return;
1574         }
1575         /* if we are implementing RTS/CTS, toggle that line */
1576         if (tty->termios->c_cflag & CRTSCTS) {
1577                 mos7840_port->shadowMCR &= ~MCR_RTS;
1578                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1579                                          mos7840_port->shadowMCR);
1580                 if (status < 0)
1581                         return;
1582         }
1583
1584         return;
1585 }
1586
1587 /*****************************************************************************
1588  * mos7840_unthrottle
1589  *      this function is called by the tty driver when it wants to resume
1590  *      the data being read from the port (called after mos7840_throttle is
1591  *      called)
1592  *****************************************************************************/
1593 static void mos7840_unthrottle(struct tty_struct *tty)
1594 {
1595         struct usb_serial_port *port = tty->driver_data;
1596         int status;
1597         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1598
1599         if (mos7840_port_paranoia_check(port, __func__)) {
1600                 dbg("%s", "Invalid port \n");
1601                 return;
1602         }
1603
1604         if (mos7840_port == NULL)
1605                 return;
1606
1607         if (!mos7840_port->open) {
1608                 dbg("%s - port not opened", __func__);
1609                 return;
1610         }
1611
1612         dbg("%s", "Entering .......... \n");
1613
1614         /* if we are implementing XON/XOFF, send the start character */
1615         if (I_IXOFF(tty)) {
1616                 unsigned char start_char = START_CHAR(tty);
1617                 status = mos7840_write(tty, port, &start_char, 1);
1618                 if (status <= 0)
1619                         return;
1620         }
1621
1622         /* if we are implementing RTS/CTS, toggle that line */
1623         if (tty->termios->c_cflag & CRTSCTS) {
1624                 mos7840_port->shadowMCR |= MCR_RTS;
1625                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1626                                          mos7840_port->shadowMCR);
1627                 if (status < 0)
1628                         return;
1629         }
1630 }
1631
1632 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1633 {
1634         struct usb_serial_port *port = tty->driver_data;
1635         struct moschip_port *mos7840_port;
1636         unsigned int result;
1637         __u16 msr;
1638         __u16 mcr;
1639         int status;
1640         mos7840_port = mos7840_get_port_private(port);
1641
1642         dbg("%s - port %d", __func__, port->number);
1643
1644         if (mos7840_port == NULL)
1645                 return -ENODEV;
1646
1647         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1648         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1649         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1650             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1651             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1652             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1653             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1654             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1655             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1656
1657         dbg("%s - 0x%04X", __func__, result);
1658
1659         return result;
1660 }
1661
1662 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1663                             unsigned int set, unsigned int clear)
1664 {
1665         struct usb_serial_port *port = tty->driver_data;
1666         struct moschip_port *mos7840_port;
1667         unsigned int mcr;
1668         int status;
1669
1670         dbg("%s - port %d", __func__, port->number);
1671
1672         mos7840_port = mos7840_get_port_private(port);
1673
1674         if (mos7840_port == NULL)
1675                 return -ENODEV;
1676
1677         /* FIXME: What locks the port registers ? */
1678         mcr = mos7840_port->shadowMCR;
1679         if (clear & TIOCM_RTS)
1680                 mcr &= ~MCR_RTS;
1681         if (clear & TIOCM_DTR)
1682                 mcr &= ~MCR_DTR;
1683         if (clear & TIOCM_LOOP)
1684                 mcr &= ~MCR_LOOPBACK;
1685
1686         if (set & TIOCM_RTS)
1687                 mcr |= MCR_RTS;
1688         if (set & TIOCM_DTR)
1689                 mcr |= MCR_DTR;
1690         if (set & TIOCM_LOOP)
1691                 mcr |= MCR_LOOPBACK;
1692
1693         mos7840_port->shadowMCR = mcr;
1694
1695         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1696         if (status < 0) {
1697                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1698                 return status;
1699         }
1700
1701         return 0;
1702 }
1703
1704 /*****************************************************************************
1705  * mos7840_calc_baud_rate_divisor
1706  *      this function calculates the proper baud rate divisor for the specified
1707  *      baud rate.
1708  *****************************************************************************/
1709 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1710                                           __u16 *clk_sel_val)
1711 {
1712
1713         dbg("%s - %d", __func__, baudRate);
1714
1715         if (baudRate <= 115200) {
1716                 *divisor = 115200 / baudRate;
1717                 *clk_sel_val = 0x0;
1718         }
1719         if ((baudRate > 115200) && (baudRate <= 230400)) {
1720                 *divisor = 230400 / baudRate;
1721                 *clk_sel_val = 0x10;
1722         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1723                 *divisor = 403200 / baudRate;
1724                 *clk_sel_val = 0x20;
1725         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1726                 *divisor = 460800 / baudRate;
1727                 *clk_sel_val = 0x30;
1728         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1729                 *divisor = 806400 / baudRate;
1730                 *clk_sel_val = 0x40;
1731         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1732                 *divisor = 921600 / baudRate;
1733                 *clk_sel_val = 0x50;
1734         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1735                 *divisor = 1572864 / baudRate;
1736                 *clk_sel_val = 0x60;
1737         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1738                 *divisor = 3145728 / baudRate;
1739                 *clk_sel_val = 0x70;
1740         }
1741         return 0;
1742
1743 #ifdef NOTMCS7840
1744
1745         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1746                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1747                         *divisor = mos7840_divisor_table[i].Divisor;
1748                         return 0;
1749                 }
1750         }
1751
1752         /* After trying for all the standard baud rates    *
1753          * Try calculating the divisor for this baud rate  */
1754
1755         if (baudrate > 75 && baudrate < 230400) {
1756                 /* get the divisor */
1757                 custom = (__u16) (230400L / baudrate);
1758
1759                 /* Check for round off */
1760                 round1 = (__u16) (2304000L / baudrate);
1761                 round = (__u16) (round1 - (custom * 10));
1762                 if (round > 4)
1763                         custom++;
1764                 *divisor = custom;
1765
1766                 dbg(" Baud %d = %d\n", baudrate, custom);
1767                 return 0;
1768         }
1769
1770         dbg("%s\n", " Baud calculation Failed...");
1771         return -1;
1772 #endif
1773 }
1774
1775 /*****************************************************************************
1776  * mos7840_send_cmd_write_baud_rate
1777  *      this function sends the proper command to change the baud rate of the
1778  *      specified port.
1779  *****************************************************************************/
1780
1781 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1782                                             int baudRate)
1783 {
1784         int divisor = 0;
1785         int status;
1786         __u16 Data;
1787         unsigned char number;
1788         __u16 clk_sel_val;
1789         struct usb_serial_port *port;
1790
1791         if (mos7840_port == NULL)
1792                 return -1;
1793
1794         port = (struct usb_serial_port *)mos7840_port->port;
1795         if (mos7840_port_paranoia_check(port, __func__)) {
1796                 dbg("%s", "Invalid port \n");
1797                 return -1;
1798         }
1799
1800         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1801                 dbg("%s", "Invalid Serial \n");
1802                 return -1;
1803         }
1804
1805         dbg("%s", "Entering .......... \n");
1806
1807         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1808
1809         dbg("%s - port = %d, baud = %d", __func__,
1810             mos7840_port->port->number, baudRate);
1811         /* reset clk_uart_sel in spregOffset */
1812         if (baudRate > 115200) {
1813 #ifdef HW_flow_control
1814                 /* NOTE: need to see the pther register to modify */
1815                 /* setting h/w flow control bit to 1 */
1816                 Data = 0x2b;
1817                 mos7840_port->shadowMCR = Data;
1818                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1819                                                                         Data);
1820                 if (status < 0) {
1821                         dbg("Writing spreg failed in set_serial_baud\n");
1822                         return -1;
1823                 }
1824 #endif
1825
1826         } else {
1827 #ifdef HW_flow_control
1828                 / *setting h/w flow control bit to 0 */
1829                 Data = 0xb;
1830                 mos7840_port->shadowMCR = Data;
1831                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1832                                                                         Data);
1833                 if (status < 0) {
1834                         dbg("Writing spreg failed in set_serial_baud\n");
1835                         return -1;
1836                 }
1837 #endif
1838
1839         }
1840
1841         if (1) {                /* baudRate <= 115200) */
1842                 clk_sel_val = 0x0;
1843                 Data = 0x0;
1844                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1845                                                    &clk_sel_val);
1846                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1847                                                                  &Data);
1848                 if (status < 0) {
1849                         dbg("reading spreg failed in set_serial_baud\n");
1850                         return -1;
1851                 }
1852                 Data = (Data & 0x8f) | clk_sel_val;
1853                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1854                                                                 Data);
1855                 if (status < 0) {
1856                         dbg("Writing spreg failed in set_serial_baud\n");
1857                         return -1;
1858                 }
1859                 /* Calculate the Divisor */
1860
1861                 if (status) {
1862                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1863                         return status;
1864                 }
1865                 /* Enable access to divisor latch */
1866                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1867                 mos7840_port->shadowLCR = Data;
1868                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1869
1870                 /* Write the divisor */
1871                 Data = (unsigned char)(divisor & 0xff);
1872                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1873                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1874
1875                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1876                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1877                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1878
1879                 /* Disable access to divisor latch */
1880                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1881                 mos7840_port->shadowLCR = Data;
1882                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1883
1884         }
1885         return status;
1886 }
1887
1888 /*****************************************************************************
1889  * mos7840_change_port_settings
1890  *      This routine is called to set the UART on the device to match
1891  *      the specified new settings.
1892  *****************************************************************************/
1893
1894 static void mos7840_change_port_settings(struct tty_struct *tty,
1895         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1896 {
1897         int baud;
1898         unsigned cflag;
1899         unsigned iflag;
1900         __u8 lData;
1901         __u8 lParity;
1902         __u8 lStop;
1903         int status;
1904         __u16 Data;
1905         struct usb_serial_port *port;
1906         struct usb_serial *serial;
1907
1908         if (mos7840_port == NULL)
1909                 return;
1910
1911         port = (struct usb_serial_port *)mos7840_port->port;
1912
1913         if (mos7840_port_paranoia_check(port, __func__)) {
1914                 dbg("%s", "Invalid port \n");
1915                 return;
1916         }
1917
1918         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1919                 dbg("%s", "Invalid Serial \n");
1920                 return;
1921         }
1922
1923         serial = port->serial;
1924
1925         dbg("%s - port %d", __func__, mos7840_port->port->number);
1926
1927         if (!mos7840_port->open) {
1928                 dbg("%s - port not opened", __func__);
1929                 return;
1930         }
1931
1932         dbg("%s", "Entering .......... \n");
1933
1934         lData = LCR_BITS_8;
1935         lStop = LCR_STOP_1;
1936         lParity = LCR_PAR_NONE;
1937
1938         cflag = tty->termios->c_cflag;
1939         iflag = tty->termios->c_iflag;
1940
1941         /* Change the number of bits */
1942         if (cflag & CSIZE) {
1943                 switch (cflag & CSIZE) {
1944                 case CS5:
1945                         lData = LCR_BITS_5;
1946                         break;
1947
1948                 case CS6:
1949                         lData = LCR_BITS_6;
1950                         break;
1951
1952                 case CS7:
1953                         lData = LCR_BITS_7;
1954                         break;
1955                 default:
1956                 case CS8:
1957                         lData = LCR_BITS_8;
1958                         break;
1959                 }
1960         }
1961         /* Change the Parity bit */
1962         if (cflag & PARENB) {
1963                 if (cflag & PARODD) {
1964                         lParity = LCR_PAR_ODD;
1965                         dbg("%s - parity = odd", __func__);
1966                 } else {
1967                         lParity = LCR_PAR_EVEN;
1968                         dbg("%s - parity = even", __func__);
1969                 }
1970
1971         } else {
1972                 dbg("%s - parity = none", __func__);
1973         }
1974
1975         if (cflag & CMSPAR)
1976                 lParity = lParity | 0x20;
1977
1978         /* Change the Stop bit */
1979         if (cflag & CSTOPB) {
1980                 lStop = LCR_STOP_2;
1981                 dbg("%s - stop bits = 2", __func__);
1982         } else {
1983                 lStop = LCR_STOP_1;
1984                 dbg("%s - stop bits = 1", __func__);
1985         }
1986
1987         /* Update the LCR with the correct value */
1988         mos7840_port->shadowLCR &=
1989             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1990         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1991
1992         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
1993             mos7840_port->shadowLCR);
1994         /* Disable Interrupts */
1995         Data = 0x00;
1996         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1997
1998         Data = 0x00;
1999         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2000
2001         Data = 0xcf;
2002         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2003
2004         /* Send the updated LCR value to the mos7840 */
2005         Data = mos7840_port->shadowLCR;
2006
2007         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2008
2009         Data = 0x00b;
2010         mos7840_port->shadowMCR = Data;
2011         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2012         Data = 0x00b;
2013         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2014
2015         /* set up the MCR register and send it to the mos7840 */
2016
2017         mos7840_port->shadowMCR = MCR_MASTER_IE;
2018         if (cflag & CBAUD)
2019                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2020
2021         if (cflag & CRTSCTS)
2022                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2023         else
2024                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2025
2026         Data = mos7840_port->shadowMCR;
2027         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2028
2029         /* Determine divisor based on baud rate */
2030         baud = tty_get_baud_rate(tty);
2031
2032         if (!baud) {
2033                 /* pick a default, any default... */
2034                 dbg("%s\n", "Picked default baud...");
2035                 baud = 9600;
2036         }
2037
2038         dbg("%s - baud rate = %d", __func__, baud);
2039         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2040
2041         /* Enable Interrupts */
2042         Data = 0x0c;
2043         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2044
2045         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2046                 mos7840_port->read_urb->dev = serial->dev;
2047
2048                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2049
2050                 if (status) {
2051                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2052                             status);
2053                 }
2054         }
2055         wake_up(&mos7840_port->delta_msr_wait);
2056         mos7840_port->delta_msr_cond = 1;
2057         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2058             mos7840_port->shadowLCR);
2059
2060         return;
2061 }
2062
2063 /*****************************************************************************
2064  * mos7840_set_termios
2065  *      this function is called by the tty driver when it wants to change
2066  *      the termios structure
2067  *****************************************************************************/
2068
2069 static void mos7840_set_termios(struct tty_struct *tty,
2070                                 struct usb_serial_port *port,
2071                                 struct ktermios *old_termios)
2072 {
2073         int status;
2074         unsigned int cflag;
2075         struct usb_serial *serial;
2076         struct moschip_port *mos7840_port;
2077         dbg("mos7840_set_termios: START\n");
2078         if (mos7840_port_paranoia_check(port, __func__)) {
2079                 dbg("%s", "Invalid port \n");
2080                 return;
2081         }
2082
2083         serial = port->serial;
2084
2085         if (mos7840_serial_paranoia_check(serial, __func__)) {
2086                 dbg("%s", "Invalid Serial \n");
2087                 return;
2088         }
2089
2090         mos7840_port = mos7840_get_port_private(port);
2091
2092         if (mos7840_port == NULL)
2093                 return;
2094
2095         if (!mos7840_port->open) {
2096                 dbg("%s - port not opened", __func__);
2097                 return;
2098         }
2099
2100         dbg("%s\n", "setting termios - ");
2101
2102         cflag = tty->termios->c_cflag;
2103
2104         dbg("%s - clfag %08x iflag %08x", __func__,
2105             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2106         dbg("%s - old clfag %08x old iflag %08x", __func__,
2107             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2108         dbg("%s - port %d", __func__, port->number);
2109
2110         /* change the port settings to the new ones specified */
2111
2112         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2113
2114         if (!mos7840_port->read_urb) {
2115                 dbg("%s", "URB KILLED !!!!!\n");
2116                 return;
2117         }
2118
2119         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2120                 mos7840_port->read_urb->dev = serial->dev;
2121                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2122                 if (status) {
2123                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2124                             status);
2125                 }
2126         }
2127         return;
2128 }
2129
2130 /*****************************************************************************
2131  * mos7840_get_lsr_info - get line status register info
2132  *
2133  * Purpose: Let user call ioctl() to get info when the UART physically
2134  *          is emptied.  On bus types like RS485, the transmitter must
2135  *          release the bus after transmitting. This must be done when
2136  *          the transmit shift register is empty, not be done when the
2137  *          transmit holding register is empty.  This functionality
2138  *          allows an RS485 driver to be written in user space.
2139  *****************************************************************************/
2140
2141 static int mos7840_get_lsr_info(struct tty_struct *tty,
2142                                 unsigned int __user *value)
2143 {
2144         int count;
2145         unsigned int result = 0;
2146
2147         count = mos7840_chars_in_buffer(tty);
2148         if (count == 0) {
2149                 dbg("%s -- Empty", __func__);
2150                 result = TIOCSER_TEMT;
2151         }
2152
2153         if (copy_to_user(value, &result, sizeof(int)))
2154                 return -EFAULT;
2155         return 0;
2156 }
2157
2158 /*****************************************************************************
2159  * mos7840_set_modem_info
2160  *      function to set modem info
2161  *****************************************************************************/
2162
2163 /* FIXME: Should be using the model control hooks */
2164
2165 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2166                                   unsigned int cmd, unsigned int __user *value)
2167 {
2168         unsigned int mcr;
2169         unsigned int arg;
2170         __u16 Data;
2171         int status;
2172         struct usb_serial_port *port;
2173
2174         if (mos7840_port == NULL)
2175                 return -1;
2176
2177         port = (struct usb_serial_port *)mos7840_port->port;
2178         if (mos7840_port_paranoia_check(port, __func__)) {
2179                 dbg("%s", "Invalid port \n");
2180                 return -1;
2181         }
2182
2183         mcr = mos7840_port->shadowMCR;
2184
2185         if (copy_from_user(&arg, value, sizeof(int)))
2186                 return -EFAULT;
2187
2188         switch (cmd) {
2189         case TIOCMBIS:
2190                 if (arg & TIOCM_RTS)
2191                         mcr |= MCR_RTS;
2192                 if (arg & TIOCM_DTR)
2193                         mcr |= MCR_RTS;
2194                 if (arg & TIOCM_LOOP)
2195                         mcr |= MCR_LOOPBACK;
2196                 break;
2197
2198         case TIOCMBIC:
2199                 if (arg & TIOCM_RTS)
2200                         mcr &= ~MCR_RTS;
2201                 if (arg & TIOCM_DTR)
2202                         mcr &= ~MCR_RTS;
2203                 if (arg & TIOCM_LOOP)
2204                         mcr &= ~MCR_LOOPBACK;
2205                 break;
2206
2207         case TIOCMSET:
2208                 /* turn off the RTS and DTR and LOOPBACK
2209                  * and then only turn on what was asked to */
2210                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2211                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2212                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2213                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2214                 break;
2215         }
2216
2217         mos7840_port->shadowMCR = mcr;
2218
2219         Data = mos7840_port->shadowMCR;
2220         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2221         if (status < 0) {
2222                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2223                 return -1;
2224         }
2225
2226         return 0;
2227 }
2228
2229 /*****************************************************************************
2230  * mos7840_get_modem_info
2231  *      function to get modem info
2232  *****************************************************************************/
2233
2234 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2235                                   unsigned int __user *value)
2236 {
2237         unsigned int result = 0;
2238         __u16 msr;
2239         unsigned int mcr = mos7840_port->shadowMCR;
2240         mos7840_get_uart_reg(mos7840_port->port,
2241                                                 MODEM_STATUS_REGISTER, &msr);
2242         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2243             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2244             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2245             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2246             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2247             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2248
2249         dbg("%s -- %x", __func__, result);
2250
2251         if (copy_to_user(value, &result, sizeof(int)))
2252                 return -EFAULT;
2253         return 0;
2254 }
2255
2256 /*****************************************************************************
2257  * mos7840_get_serial_info
2258  *      function to get information about serial port
2259  *****************************************************************************/
2260
2261 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2262                                    struct serial_struct __user *retinfo)
2263 {
2264         struct serial_struct tmp;
2265
2266         if (mos7840_port == NULL)
2267                 return -1;
2268
2269         if (!retinfo)
2270                 return -EFAULT;
2271
2272         memset(&tmp, 0, sizeof(tmp));
2273
2274         tmp.type = PORT_16550A;
2275         tmp.line = mos7840_port->port->serial->minor;
2276         tmp.port = mos7840_port->port->number;
2277         tmp.irq = 0;
2278         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2279         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2280         tmp.baud_base = 9600;
2281         tmp.close_delay = 5 * HZ;
2282         tmp.closing_wait = 30 * HZ;
2283
2284         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2285                 return -EFAULT;
2286         return 0;
2287 }
2288
2289 /*****************************************************************************
2290  * SerialIoctl
2291  *      this function handles any ioctl calls to the driver
2292  *****************************************************************************/
2293
2294 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2295                          unsigned int cmd, unsigned long arg)
2296 {
2297         struct usb_serial_port *port = tty->driver_data;
2298         void __user *argp = (void __user *)arg;
2299         struct moschip_port *mos7840_port;
2300
2301         struct async_icount cnow;
2302         struct async_icount cprev;
2303         struct serial_icounter_struct icount;
2304         int mosret = 0;
2305
2306         if (mos7840_port_paranoia_check(port, __func__)) {
2307                 dbg("%s", "Invalid port \n");
2308                 return -1;
2309         }
2310
2311         mos7840_port = mos7840_get_port_private(port);
2312
2313         if (mos7840_port == NULL)
2314                 return -1;
2315
2316         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2317
2318         switch (cmd) {
2319                 /* return number of bytes available */
2320
2321         case TIOCSERGETLSR:
2322                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2323                 return mos7840_get_lsr_info(tty, argp);
2324                 return 0;
2325
2326         /* FIXME: use the modem hooks and remove this */
2327         case TIOCMBIS:
2328         case TIOCMBIC:
2329         case TIOCMSET:
2330                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2331                     port->number);
2332                 mosret =
2333                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2334                 return mosret;
2335
2336         case TIOCMGET:
2337                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2338                 return mos7840_get_modem_info(mos7840_port, argp);
2339
2340         case TIOCGSERIAL:
2341                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2342                 return mos7840_get_serial_info(mos7840_port, argp);
2343
2344         case TIOCSSERIAL:
2345                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2346                 break;
2347
2348         case TIOCMIWAIT:
2349                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2350                 cprev = mos7840_port->icount;
2351                 while (1) {
2352                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2353                         mos7840_port->delta_msr_cond = 0;
2354                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2355                                                  (mos7840_port->
2356                                                   delta_msr_cond == 1));
2357
2358                         /* see if a signal did it */
2359                         if (signal_pending(current))
2360                                 return -ERESTARTSYS;
2361                         cnow = mos7840_port->icount;
2362                         smp_rmb();
2363                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2364                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2365                                 return -EIO;    /* no change => error */
2366                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2367                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2368                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2369                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2370                                 return 0;
2371                         }
2372                         cprev = cnow;
2373                 }
2374                 /* NOTREACHED */
2375                 break;
2376
2377         case TIOCGICOUNT:
2378                 cnow = mos7840_port->icount;
2379                 smp_rmb();
2380                 icount.cts = cnow.cts;
2381                 icount.dsr = cnow.dsr;
2382                 icount.rng = cnow.rng;
2383                 icount.dcd = cnow.dcd;
2384                 icount.rx = cnow.rx;
2385                 icount.tx = cnow.tx;
2386                 icount.frame = cnow.frame;
2387                 icount.overrun = cnow.overrun;
2388                 icount.parity = cnow.parity;
2389                 icount.brk = cnow.brk;
2390                 icount.buf_overrun = cnow.buf_overrun;
2391
2392                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2393                     port->number, icount.rx, icount.tx);
2394                 if (copy_to_user(argp, &icount, sizeof(icount)))
2395                         return -EFAULT;
2396                 return 0;
2397         default:
2398                 break;
2399         }
2400         return -ENOIOCTLCMD;
2401 }
2402
2403 static int mos7840_calc_num_ports(struct usb_serial *serial)
2404 {
2405         int mos7840_num_ports = 0;
2406
2407         dbg("numberofendpoints: %d \n",
2408             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2409         dbg("numberofendpoints: %d \n",
2410             (int)serial->interface->altsetting->desc.bNumEndpoints);
2411         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2412                 mos7840_num_ports = serial->num_ports = 2;
2413         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2414                 serial->num_bulk_in = 4;
2415                 serial->num_bulk_out = 4;
2416                 mos7840_num_ports = serial->num_ports = 4;
2417         }
2418
2419         return mos7840_num_ports;
2420 }
2421
2422 /****************************************************************************
2423  * mos7840_startup
2424  ****************************************************************************/
2425
2426 static int mos7840_startup(struct usb_serial *serial)
2427 {
2428         struct moschip_port *mos7840_port;
2429         struct usb_device *dev;
2430         int i, status;
2431
2432         __u16 Data;
2433         dbg("%s \n", " mos7840_startup :entering..........");
2434
2435         if (!serial) {
2436                 dbg("%s\n", "Invalid Handler");
2437                 return -1;
2438         }
2439
2440         dev = serial->dev;
2441
2442         dbg("%s\n", "Entering...");
2443
2444         /* we set up the pointers to the endpoints in the mos7840_open *
2445          * function, as the structures aren't created yet.             */
2446
2447         /* set up port private structures */
2448         for (i = 0; i < serial->num_ports; ++i) {
2449                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2450                 if (mos7840_port == NULL) {
2451                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2452                         status = -ENOMEM;
2453                         i--; /* don't follow NULL pointer cleaning up */
2454                         goto error;
2455                 }
2456
2457                 /* Initialize all port interrupt end point to port 0 int
2458                  * endpoint. Our device has only one interrupt end point
2459                  * common to all port */
2460
2461                 mos7840_port->port = serial->port[i];
2462                 mos7840_set_port_private(serial->port[i], mos7840_port);
2463                 spin_lock_init(&mos7840_port->pool_lock);
2464
2465                 mos7840_port->port_num = ((serial->port[i]->number -
2466                                            (serial->port[i]->serial->minor)) +
2467                                           1);
2468
2469                 if (mos7840_port->port_num == 1) {
2470                         mos7840_port->SpRegOffset = 0x0;
2471                         mos7840_port->ControlRegOffset = 0x1;
2472                         mos7840_port->DcrRegOffset = 0x4;
2473                 } else if ((mos7840_port->port_num == 2)
2474                            && (serial->num_ports == 4)) {
2475                         mos7840_port->SpRegOffset = 0x8;
2476                         mos7840_port->ControlRegOffset = 0x9;
2477                         mos7840_port->DcrRegOffset = 0x16;
2478                 } else if ((mos7840_port->port_num == 2)
2479                            && (serial->num_ports == 2)) {
2480                         mos7840_port->SpRegOffset = 0xa;
2481                         mos7840_port->ControlRegOffset = 0xb;
2482                         mos7840_port->DcrRegOffset = 0x19;
2483                 } else if ((mos7840_port->port_num == 3)
2484                            && (serial->num_ports == 4)) {
2485                         mos7840_port->SpRegOffset = 0xa;
2486                         mos7840_port->ControlRegOffset = 0xb;
2487                         mos7840_port->DcrRegOffset = 0x19;
2488                 } else if ((mos7840_port->port_num == 4)
2489                            && (serial->num_ports == 4)) {
2490                         mos7840_port->SpRegOffset = 0xc;
2491                         mos7840_port->ControlRegOffset = 0xd;
2492                         mos7840_port->DcrRegOffset = 0x1c;
2493                 }
2494                 mos7840_dump_serial_port(mos7840_port);
2495                 mos7840_set_port_private(serial->port[i], mos7840_port);
2496
2497                 /* enable rx_disable bit in control register */
2498                 status = mos7840_get_reg_sync(serial->port[i],
2499                                  mos7840_port->ControlRegOffset, &Data);
2500                 if (status < 0) {
2501                         dbg("Reading ControlReg failed status-0x%x\n", status);
2502                         break;
2503                 } else
2504                         dbg("ControlReg Reading success val is %x, status%d\n",
2505                             Data, status);
2506                 Data |= 0x08;   /* setting driver done bit */
2507                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2508                                    modem status reg */
2509
2510                 /* Data |= 0x20; //rx_disable bit */
2511                 status = mos7840_set_reg_sync(serial->port[i],
2512                                          mos7840_port->ControlRegOffset, Data);
2513                 if (status < 0) {
2514                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2515                         break;
2516                 } else
2517                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2518                             status);
2519
2520                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2521                    and 0x24 in DCR3 */
2522                 Data = 0x01;
2523                 status = mos7840_set_reg_sync(serial->port[i],
2524                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2525                 if (status < 0) {
2526                         dbg("Writing DCR0 failed status-0x%x\n", status);
2527                         break;
2528                 } else
2529                         dbg("DCR0 Writing success status%d\n", status);
2530
2531                 Data = 0x05;
2532                 status = mos7840_set_reg_sync(serial->port[i],
2533                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2534                 if (status < 0) {
2535                         dbg("Writing DCR1 failed status-0x%x\n", status);
2536                         break;
2537                 } else
2538                         dbg("DCR1 Writing success status%d\n", status);
2539
2540                 Data = 0x24;
2541                 status = mos7840_set_reg_sync(serial->port[i],
2542                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2543                 if (status < 0) {
2544                         dbg("Writing DCR2 failed status-0x%x\n", status);
2545                         break;
2546                 } else
2547                         dbg("DCR2 Writing success status%d\n", status);
2548
2549                 /* write values in clkstart0x0 and clkmulti 0x20 */
2550                 Data = 0x0;
2551                 status = mos7840_set_reg_sync(serial->port[i],
2552                                          CLK_START_VALUE_REGISTER, Data);
2553                 if (status < 0) {
2554                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2555                         break;
2556                 } else
2557                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2558
2559                 Data = 0x20;
2560                 status = mos7840_set_reg_sync(serial->port[i],
2561                                         CLK_MULTI_REGISTER, Data);
2562                 if (status < 0) {
2563                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2564                             status);
2565                         goto error;
2566                 } else
2567                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2568                             status);
2569
2570                 /* write value 0x0 to scratchpad register */
2571                 Data = 0x00;
2572                 status = mos7840_set_uart_reg(serial->port[i],
2573                                                 SCRATCH_PAD_REGISTER, Data);
2574                 if (status < 0) {
2575                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2576                             status);
2577                         break;
2578                 } else
2579                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2580                             status);
2581
2582                 /* Zero Length flag register */
2583                 if ((mos7840_port->port_num != 1)
2584                     && (serial->num_ports == 2)) {
2585
2586                         Data = 0xff;
2587                         status = mos7840_set_reg_sync(serial->port[i],
2588                                       (__u16) (ZLP_REG1 +
2589                                       ((__u16)mos7840_port->port_num)), Data);
2590                         dbg("ZLIP offset%x\n",
2591                             (__u16) (ZLP_REG1 +
2592                                         ((__u16) mos7840_port->port_num)));
2593                         if (status < 0) {
2594                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2595                                     i + 2, status);
2596                                 break;
2597                         } else
2598                                 dbg("ZLP_REG%d Writing success status%d\n",
2599                                     i + 2, status);
2600                 } else {
2601                         Data = 0xff;
2602                         status = mos7840_set_reg_sync(serial->port[i],
2603                               (__u16) (ZLP_REG1 +
2604                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2605                         dbg("ZLIP offset%x\n",
2606                             (__u16) (ZLP_REG1 +
2607                                      ((__u16) mos7840_port->port_num) - 0x1));
2608                         if (status < 0) {
2609                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2610                                     i + 1, status);
2611                                 break;
2612                         } else
2613                                 dbg("ZLP_REG%d Writing success status%d\n",
2614                                     i + 1, status);
2615
2616                 }
2617                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2618                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2619                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2620                                                                 GFP_KERNEL);
2621                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2622                                                         !mos7840_port->dr) {
2623                         status = -ENOMEM;
2624                         goto error;
2625                 }
2626         }
2627
2628         /* Zero Length flag enable */
2629         Data = 0x0f;
2630         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2631         if (status < 0) {
2632                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2633                 goto error;
2634         } else
2635                 dbg("ZLP_REG5 Writing success status%d\n", status);
2636
2637         /* setting configuration feature to one */
2638         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2639                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2640         return 0;
2641 error:
2642         for (/* nothing */; i >= 0; i--) {
2643                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2644
2645                 kfree(mos7840_port->dr);
2646                 kfree(mos7840_port->ctrl_buf);
2647                 usb_free_urb(mos7840_port->control_urb);
2648                 kfree(mos7840_port);
2649                 serial->port[i] = NULL;
2650         }
2651         return status;
2652 }
2653
2654 /****************************************************************************
2655  * mos7840_shutdown
2656  *      This function is called whenever the device is removed from the usb bus.
2657  ****************************************************************************/
2658
2659 static void mos7840_shutdown(struct usb_serial *serial)
2660 {
2661         int i;
2662         unsigned long flags;
2663         struct moschip_port *mos7840_port;
2664         dbg("%s \n", " shutdown :entering..........");
2665
2666         if (!serial) {
2667                 dbg("%s", "Invalid Handler \n");
2668                 return;
2669         }
2670
2671         /* check for the ports to be closed,close the ports and disconnect */
2672
2673         /* free private structure allocated for serial port  *
2674          * stop reads and writes on all ports                */
2675
2676         for (i = 0; i < serial->num_ports; ++i) {
2677                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2678                 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2679                 mos7840_port->zombie = 1;
2680                 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2681                 usb_kill_urb(mos7840_port->control_urb);
2682                 kfree(mos7840_port->ctrl_buf);
2683                 kfree(mos7840_port->dr);
2684                 kfree(mos7840_port);
2685                 mos7840_set_port_private(serial->port[i], NULL);
2686         }
2687
2688         dbg("%s\n", "Thank u :: ");
2689
2690 }
2691
2692 static struct usb_driver io_driver = {
2693         .name = "mos7840",
2694         .probe = usb_serial_probe,
2695         .disconnect = usb_serial_disconnect,
2696         .id_table = moschip_id_table_combined,
2697         .no_dynamic_id = 1,
2698 };
2699
2700 static struct usb_serial_driver moschip7840_4port_device = {
2701         .driver = {
2702                    .owner = THIS_MODULE,
2703                    .name = "mos7840",
2704                    },
2705         .description = DRIVER_DESC,
2706         .usb_driver = &io_driver,
2707         .id_table = moschip_port_id_table,
2708         .num_ports = 4,
2709         .open = mos7840_open,
2710         .close = mos7840_close,
2711         .write = mos7840_write,
2712         .write_room = mos7840_write_room,
2713         .chars_in_buffer = mos7840_chars_in_buffer,
2714         .throttle = mos7840_throttle,
2715         .unthrottle = mos7840_unthrottle,
2716         .calc_num_ports = mos7840_calc_num_ports,
2717 #ifdef MCSSerialProbe
2718         .probe = mos7840_serial_probe,
2719 #endif
2720         .ioctl = mos7840_ioctl,
2721         .set_termios = mos7840_set_termios,
2722         .break_ctl = mos7840_break,
2723         .tiocmget = mos7840_tiocmget,
2724         .tiocmset = mos7840_tiocmset,
2725         .attach = mos7840_startup,
2726         .shutdown = mos7840_shutdown,
2727         .read_bulk_callback = mos7840_bulk_in_callback,
2728         .read_int_callback = mos7840_interrupt_callback,
2729 };
2730
2731 /****************************************************************************
2732  * moschip7840_init
2733  *      This is called by the module subsystem, or on startup to initialize us
2734  ****************************************************************************/
2735 static int __init moschip7840_init(void)
2736 {
2737         int retval;
2738
2739         dbg("%s \n", " mos7840_init :entering..........");
2740
2741         /* Register with the usb serial */
2742         retval = usb_serial_register(&moschip7840_4port_device);
2743
2744         if (retval)
2745                 goto failed_port_device_register;
2746
2747         dbg("%s\n", "Entring...");
2748         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2749                DRIVER_DESC "\n");
2750
2751         /* Register with the usb */
2752         retval = usb_register(&io_driver);
2753         if (retval == 0) {
2754                 dbg("%s\n", "Leaving...");
2755                 return 0;
2756         }
2757         usb_serial_deregister(&moschip7840_4port_device);
2758 failed_port_device_register:
2759         return retval;
2760 }
2761
2762 /****************************************************************************
2763  * moschip7840_exit
2764  *      Called when the driver is about to be unloaded.
2765  ****************************************************************************/
2766 static void __exit moschip7840_exit(void)
2767 {
2768
2769         dbg("%s \n", " mos7840_exit :entering..........");
2770
2771         usb_deregister(&io_driver);
2772
2773         usb_serial_deregister(&moschip7840_4port_device);
2774
2775         dbg("%s\n", "Entring...");
2776 }
2777
2778 module_init(moschip7840_init);
2779 module_exit(moschip7840_exit);
2780
2781 /* Module information */
2782 MODULE_DESCRIPTION(DRIVER_DESC);
2783 MODULE_LICENSE("GPL");
2784
2785 module_param(debug, bool, S_IRUGO | S_IWUSR);
2786 MODULE_PARM_DESC(debug, "Debug enabled or not");