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/smp_lock.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_driver.h>
  32 #include <linux/tty_flip.h>
  33 #include <linux/module.h>
  34 #include <linux/serial.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/serial.h>
  37 #include <linux/uaccess.h>
  38
  39 /*
  40  * Version Information
  41  */
  42 #define DRIVER_VERSION "1.3.2"
  43 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  44
  45 /*
  46  * 16C50 UART register defines
  47  */
  48
  49 #define LCR_BITS_5             0x00     /* 5 bits/char */
  50 #define LCR_BITS_6             0x01     /* 6 bits/char */
  51 #define LCR_BITS_7             0x02     /* 7 bits/char */
  52 #define LCR_BITS_8             0x03     /* 8 bits/char */
  53 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  54
  55 #define LCR_STOP_1             0x00     /* 1 stop bit */
  56 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  57 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  58 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  59
  60 #define LCR_PAR_NONE           0x00     /* No parity */
  61 #define LCR_PAR_ODD            0x08     /* Odd parity */
  62 #define LCR_PAR_EVEN           0x18     /* Even parity */
  63 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  64 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  65 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  66
  67 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  68 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  69
  70 #define MCR_DTR                0x01     /* Assert DTR */
  71 #define MCR_RTS                0x02     /* Assert RTS */
  72 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  73 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  74 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  75 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  76
  77 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  78 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  79 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  80 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  81
  82 /*
  83  * Defines used for sending commands to port
  84  */
  85
  86 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  87 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  88
  89 #define MOS_PORT1       0x0200
  90 #define MOS_PORT2       0x0300
  91 #define MOS_VENREG      0x0000
  92 #define MOS_MAX_PORT    0x02
  93 #define MOS_WRITE       0x0E
  94 #define MOS_READ        0x0D
  95
  96 /* Requests */
  97 #define MCS_RD_RTYPE    0xC0
  98 #define MCS_WR_RTYPE    0x40
  99 #define MCS_RDREQ       0x0D
 100 #define MCS_WRREQ       0x0E
 101 #define MCS_CTRL_TIMEOUT        500
 102 #define VENDOR_READ_LENGTH      (0x01)
 103
 104 #define MAX_NAME_LEN    64
 105
 106 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 107 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 108
 109 /* For higher baud Rates use TIOCEXBAUD */
 110 #define TIOCEXBAUD     0x5462
 111
 112 /* vendor id and device id defines */
 113
 114 /* The native mos7840/7820 component */
 115 #define USB_VENDOR_ID_MOSCHIP           0x9710
 116 #define MOSCHIP_DEVICE_ID_7840          0x7840
 117 #define MOSCHIP_DEVICE_ID_7820          0x7820
 118 /* The native component can have its vendor/device id's overridden
 119  * in vendor-specific implementations.  Such devices can be handled
 120  * by making a change here, in moschip_port_id_table, and in
 121  * moschip_id_table_combined
 122  */
 123 #define USB_VENDOR_ID_BANDB             0x0856
 124 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 125 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 126
 127 /* This driver also supports
 128  * ATEN UC2324 device using Moschip MCS7840
 129  * ATEN UC2322 device using Moschip MCS7820
 130  */
 131 #define USB_VENDOR_ID_ATENINTL          0x0557
 132 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 133 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 134
 135 /* Interrupt Routine Defines    */
 136
 137 #define SERIAL_IIR_RLS      0x06
 138 #define SERIAL_IIR_MS       0x00
 139
 140 /*
 141  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 142  */
 143 #define SERIAL_LSR_DR       0x0001
 144 #define SERIAL_LSR_OE       0x0002
 145 #define SERIAL_LSR_PE       0x0004
 146 #define SERIAL_LSR_FE       0x0008
 147 #define SERIAL_LSR_BI       0x0010
 148
 149 #define MOS_MSR_DELTA_CTS   0x10
 150 #define MOS_MSR_DELTA_DSR   0x20
 151 #define MOS_MSR_DELTA_RI    0x40
 152 #define MOS_MSR_DELTA_CD    0x80
 153
 154 /* Serial Port register Address */
 155 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 156 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 157 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 158 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 159 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 160 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 161 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 162 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 163 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 164
 165 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 166 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 167
 168 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 169
 170 /*
 171  * URB POOL related defines
 172  */
 173 #define NUM_URBS                        16      /* URB Count */
 174 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 175
 176
 177 static struct usb_device_id moschip_port_id_table[] = {
 178         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 179         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 180         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 181         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 182         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 183         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 184         {}                      /* terminating entry */
 185 };
 186
 187 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 188         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 189         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 190         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 191         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 192         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 193         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 194         {}                      /* terminating entry */
 195 };
 196
 197 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 198
 199 /* This structure holds all of the local port information */
 200
 201 struct moschip_port {
 202         int port_num;           /*Actual port number in the device(1,2,etc) */
 203         struct urb *write_urb;  /* write URB for this port */
 204         struct urb *read_urb;   /* read URB for this port */
 205         struct urb *int_urb;
 206         __u8 shadowLCR;         /* last LCR value received */
 207         __u8 shadowMCR;         /* last MCR value received */
 208         char open;
 209         char open_ports;
 210         char zombie;
 211         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 212         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 213         int delta_msr_cond;
 214         struct async_icount icount;
 215         struct usb_serial_port *port;   /* loop back to the owner of this object */
 216
 217         /* Offsets */
 218         __u8 SpRegOffset;
 219         __u8 ControlRegOffset;
 220         __u8 DcrRegOffset;
 221         /* for processing control URBS in interrupt context */
 222         struct urb *control_urb;
 223         struct usb_ctrlrequest *dr;
 224         char *ctrl_buf;
 225         int MsrLsr;
 226
 227         spinlock_t pool_lock;
 228         struct urb *write_urb_pool[NUM_URBS];
 229         char busy[NUM_URBS];
 230         bool read_urb_busy;
 231 };
 232
 233
 234 static int debug;
 235
 236 /*
 237  * mos7840_set_reg_sync
 238  *      To set the Control register by calling usb_fill_control_urb function
 239  *      by passing usb_sndctrlpipe function as parameter.
 240  */
 241
 242 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 243                                 __u16 val)
 244 {
 245         struct usb_device *dev = port->serial->dev;
 246         val = val & 0x00ff;
 247         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 248
 249         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 250                                MCS_WR_RTYPE, val, reg, NULL, 0,
 251                                MOS_WDR_TIMEOUT);
 252 }
 253
 254 /*
 255  * mos7840_get_reg_sync
 256  *      To set the Uart register by calling usb_fill_control_urb function by
 257  *      passing usb_rcvctrlpipe function as parameter.
 258  */
 259
 260 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 261                                 __u16 *val)
 262 {
 263         struct usb_device *dev = port->serial->dev;
 264         int ret = 0;
 265
 266         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 267                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 268                               MOS_WDR_TIMEOUT);
 269         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 270         *val = (*val) & 0x00ff;
 271         return ret;
 272 }
 273
 274 /*
 275  * mos7840_set_uart_reg
 276  *      To set the Uart register by calling usb_fill_control_urb function by
 277  *      passing usb_sndctrlpipe function as parameter.
 278  */
 279
 280 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 281                                 __u16 val)
 282 {
 283
 284         struct usb_device *dev = port->serial->dev;
 285         val = val & 0x00ff;
 286         /* For the UART control registers, the application number need
 287            to be Or'ed */
 288         if (port->serial->num_ports == 4) {
 289                 val |= (((__u16) port->number -
 290                                 (__u16) (port->serial->minor)) + 1) << 8;
 291                 dbg("mos7840_set_uart_reg application number is %x", val);
 292         } else {
 293                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 294                         val |= (((__u16) port->number -
 295                               (__u16) (port->serial->minor)) + 1) << 8;
 296                         dbg("mos7840_set_uart_reg application number is %x",
 297                             val);
 298                 } else {
 299                         val |=
 300                             (((__u16) port->number -
 301                               (__u16) (port->serial->minor)) + 2) << 8;
 302                         dbg("mos7840_set_uart_reg application number is %x",
 303                             val);
 304                 }
 305         }
 306         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 307                                MCS_WR_RTYPE, val, reg, NULL, 0,
 308                                MOS_WDR_TIMEOUT);
 309
 310 }
 311
 312 /*
 313  * mos7840_get_uart_reg
 314  *      To set the Control register by calling usb_fill_control_urb function
 315  *      by passing usb_rcvctrlpipe function as parameter.
 316  */
 317 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 318                                 __u16 *val)
 319 {
 320         struct usb_device *dev = port->serial->dev;
 321         int ret = 0;
 322         __u16 Wval;
 323
 324         /* dbg("application number is %4x",
 325             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 326         /* Wval  is same as application number */
 327         if (port->serial->num_ports == 4) {
 328                 Wval =
 329                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 330                      1) << 8;
 331                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 332         } else {
 333                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 334                         Wval = (((__u16) port->number -
 335                               (__u16) (port->serial->minor)) + 1) << 8;
 336                         dbg("mos7840_get_uart_reg application number is %x",
 337                             Wval);
 338                 } else {
 339                         Wval = (((__u16) port->number -
 340                               (__u16) (port->serial->minor)) + 2) << 8;
 341                         dbg("mos7840_get_uart_reg application number is %x",
 342                             Wval);
 343                 }
 344         }
 345         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 346                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 347                               MOS_WDR_TIMEOUT);
 348         *val = (*val) & 0x00ff;
 349         return ret;
 350 }
 351
 352 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 353 {
 354
 355         dbg("***************************************");
 356         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 357         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 358         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 359         dbg("***************************************");
 360
 361 }
 362
 363 /************************************************************************/
 364 /************************************************************************/
 365 /*             I N T E R F A C E   F U N C T I O N S                    */
 366 /*             I N T E R F A C E   F U N C T I O N S                    */
 367 /************************************************************************/
 368 /************************************************************************/
 369
 370 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 371                                             struct moschip_port *data)
 372 {
 373         usb_set_serial_port_data(port, (void *)data);
 374 }
 375
 376 static inline struct moschip_port *mos7840_get_port_private(struct
 377                                                             usb_serial_port
 378                                                             *port)
 379 {
 380         return (struct moschip_port *)usb_get_serial_port_data(port);
 381 }
 382
 383 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 384 {
 385         struct moschip_port *mos7840_port;
 386         struct async_icount *icount;
 387         mos7840_port = port;
 388         icount = &mos7840_port->icount;
 389         if (new_msr &
 390             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 391              MOS_MSR_DELTA_CD)) {
 392                 icount = &mos7840_port->icount;
 393
 394                 /* update input line counters */
 395                 if (new_msr & MOS_MSR_DELTA_CTS) {
 396                         icount->cts++;
 397                         smp_wmb();
 398                 }
 399                 if (new_msr & MOS_MSR_DELTA_DSR) {
 400                         icount->dsr++;
 401                         smp_wmb();
 402                 }
 403                 if (new_msr & MOS_MSR_DELTA_CD) {
 404                         icount->dcd++;
 405                         smp_wmb();
 406                 }
 407                 if (new_msr & MOS_MSR_DELTA_RI) {
 408                         icount->rng++;
 409                         smp_wmb();
 410                 }
 411         }
 412 }
 413
 414 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 415 {
 416         struct async_icount *icount;
 417
 418         dbg("%s - %02x", __func__, new_lsr);
 419
 420         if (new_lsr & SERIAL_LSR_BI) {
 421                 /*
 422                  * Parity and Framing errors only count if they
 423                  * occur exclusive of a break being
 424                  * received.
 425                  */
 426                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 427         }
 428
 429         /* update input line counters */
 430         icount = &port->icount;
 431         if (new_lsr & SERIAL_LSR_BI) {
 432                 icount->brk++;
 433                 smp_wmb();
 434         }
 435         if (new_lsr & SERIAL_LSR_OE) {
 436                 icount->overrun++;
 437                 smp_wmb();
 438         }
 439         if (new_lsr & SERIAL_LSR_PE) {
 440                 icount->parity++;
 441                 smp_wmb();
 442         }
 443         if (new_lsr & SERIAL_LSR_FE) {
 444                 icount->frame++;
 445                 smp_wmb();
 446         }
 447 }
 448
 449 /************************************************************************/
 450 /************************************************************************/
 451 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 452 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 453 /************************************************************************/
 454 /************************************************************************/
 455
 456 static void mos7840_control_callback(struct urb *urb)
 457 {
 458         unsigned char *data;
 459         struct moschip_port *mos7840_port;
 460         __u8 regval = 0x0;
 461         int result = 0;
 462         int status = urb->status;
 463
 464         mos7840_port = urb->context;
 465
 466         switch (status) {
 467         case 0:
 468                 /* success */
 469                 break;
 470         case -ECONNRESET:
 471         case -ENOENT:
 472         case -ESHUTDOWN:
 473                 /* this urb is terminated, clean up */
 474                 dbg("%s - urb shutting down with status: %d", __func__,
 475                     status);
 476                 return;
 477         default:
 478                 dbg("%s - nonzero urb status received: %d", __func__,
 479                     status);
 480                 goto exit;
 481         }
 482
 483         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 484         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 485             mos7840_port->MsrLsr, mos7840_port->port_num);
 486         data = urb->transfer_buffer;
 487         regval = (__u8) data[0];
 488         dbg("%s data is %x", __func__, regval);
 489         if (mos7840_port->MsrLsr == 0)
 490                 mos7840_handle_new_msr(mos7840_port, regval);
 491         else if (mos7840_port->MsrLsr == 1)
 492                 mos7840_handle_new_lsr(mos7840_port, regval);
 493
 494 exit:
 495         spin_lock(&mos7840_port->pool_lock);
 496         if (!mos7840_port->zombie)
 497                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 498         spin_unlock(&mos7840_port->pool_lock);
 499         if (result) {
 500                 dev_err(&urb->dev->dev,
 501                         "%s - Error %d submitting interrupt urb\n",
 502                         __func__, result);
 503         }
 504 }
 505
 506 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 507                            __u16 *val)
 508 {
 509         struct usb_device *dev = mcs->port->serial->dev;
 510         struct usb_ctrlrequest *dr = mcs->dr;
 511         unsigned char *buffer = mcs->ctrl_buf;
 512         int ret;
 513
 514         dr->bRequestType = MCS_RD_RTYPE;
 515         dr->bRequest = MCS_RDREQ;
 516         dr->wValue = cpu_to_le16(Wval); /* 0 */
 517         dr->wIndex = cpu_to_le16(reg);
 518         dr->wLength = cpu_to_le16(2);
 519
 520         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 521                              (unsigned char *)dr, buffer, 2,
 522                              mos7840_control_callback, mcs);
 523         mcs->control_urb->transfer_buffer_length = 2;
 524         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 525         return ret;
 526 }
 527
 528 /*****************************************************************************
 529  * mos7840_interrupt_callback
 530  *      this is the callback function for when we have received data on the
 531  *      interrupt endpoint.
 532  *****************************************************************************/
 533
 534 static void mos7840_interrupt_callback(struct urb *urb)
 535 {
 536         int result;
 537         int length;
 538         struct moschip_port *mos7840_port;
 539         struct usb_serial *serial;
 540         __u16 Data;
 541         unsigned char *data;
 542         __u8 sp[5], st;
 543         int i, rv = 0;
 544         __u16 wval, wreg = 0;
 545         int status = urb->status;
 546
 547         dbg("%s", " : Entering");
 548
 549         switch (status) {
 550         case 0:
 551                 /* success */
 552                 break;
 553         case -ECONNRESET:
 554         case -ENOENT:
 555         case -ESHUTDOWN:
 556                 /* this urb is terminated, clean up */
 557                 dbg("%s - urb shutting down with status: %d", __func__,
 558                     status);
 559                 return;
 560         default:
 561                 dbg("%s - nonzero urb status received: %d", __func__,
 562                     status);
 563                 goto exit;
 564         }
 565
 566         length = urb->actual_length;
 567         data = urb->transfer_buffer;
 568
 569         serial = urb->context;
 570
 571         /* Moschip get 5 bytes
 572          * Byte 1 IIR Port 1 (port.number is 0)
 573          * Byte 2 IIR Port 2 (port.number is 1)
 574          * Byte 3 IIR Port 3 (port.number is 2)
 575          * Byte 4 IIR Port 4 (port.number is 3)
 576          * Byte 5 FIFO status for both */
 577
 578         if (length && length > 5) {
 579                 dbg("%s", "Wrong data !!!");
 580                 return;
 581         }
 582
 583         sp[0] = (__u8) data[0];
 584         sp[1] = (__u8) data[1];
 585         sp[2] = (__u8) data[2];
 586         sp[3] = (__u8) data[3];
 587         st = (__u8) data[4];
 588
 589         for (i = 0; i < serial->num_ports; i++) {
 590                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 591                 wval =
 592                     (((__u16) serial->port[i]->number -
 593                       (__u16) (serial->minor)) + 1) << 8;
 594                 if (mos7840_port->open) {
 595                         if (sp[i] & 0x01) {
 596                                 dbg("SP%d No Interrupt !!!", i);
 597                         } else {
 598                                 switch (sp[i] & 0x0f) {
 599                                 case SERIAL_IIR_RLS:
 600                                         dbg("Serial Port %d: Receiver status error or ", i);
 601                                         dbg("address bit detected in 9-bit mode");
 602                                         mos7840_port->MsrLsr = 1;
 603                                         wreg = LINE_STATUS_REGISTER;
 604                                         break;
 605                                 case SERIAL_IIR_MS:
 606                                         dbg("Serial Port %d: Modem status change", i);
 607                                         mos7840_port->MsrLsr = 0;
 608                                         wreg = MODEM_STATUS_REGISTER;
 609                                         break;
 610                                 }
 611                                 spin_lock(&mos7840_port->pool_lock);
 612                                 if (!mos7840_port->zombie) {
 613                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 614                                 } else {
 615                                         spin_unlock(&mos7840_port->pool_lock);
 616                                         return;
 617                                 }
 618                                 spin_unlock(&mos7840_port->pool_lock);
 619                         }
 620                 }
 621         }
 622         if (!(rv < 0))
 623                 /* the completion handler for the control urb will resubmit */
 624                 return;
 625 exit:
 626         result = usb_submit_urb(urb, GFP_ATOMIC);
 627         if (result) {
 628                 dev_err(&urb->dev->dev,
 629                         "%s - Error %d submitting interrupt urb\n",
 630                         __func__, result);
 631         }
 632 }
 633
 634 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 635                                        const char *function)
 636 {
 637         if (!port) {
 638                 dbg("%s - port == NULL", function);
 639                 return -1;
 640         }
 641         if (!port->serial) {
 642                 dbg("%s - port->serial == NULL", function);
 643                 return -1;
 644         }
 645
 646         return 0;
 647 }
 648
 649 /* Inline functions to check the sanity of a pointer that is passed to us */
 650 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 651                                          const char *function)
 652 {
 653         if (!serial) {
 654                 dbg("%s - serial == NULL", function);
 655                 return -1;
 656         }
 657         if (!serial->type) {
 658                 dbg("%s - serial->type == NULL!", function);
 659                 return -1;
 660         }
 661
 662         return 0;
 663 }
 664
 665 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 666                                                  const char *function)
 667 {
 668         /* if no port was specified, or it fails a paranoia check */
 669         if (!port ||
 670             mos7840_port_paranoia_check(port, function) ||
 671             mos7840_serial_paranoia_check(port->serial, function)) {
 672                 /* then say that we don't have a valid usb_serial thing,
 673                  * which will end up genrating -ENODEV return values */
 674                 return NULL;
 675         }
 676
 677         return port->serial;
 678 }
 679
 680 /*****************************************************************************
 681  * mos7840_bulk_in_callback
 682  *      this is the callback function for when we have received data on the
 683  *      bulk in endpoint.
 684  *****************************************************************************/
 685
 686 static void mos7840_bulk_in_callback(struct urb *urb)
 687 {
 688         int retval;
 689         unsigned char *data;
 690         struct usb_serial *serial;
 691         struct usb_serial_port *port;
 692         struct moschip_port *mos7840_port;
 693         struct tty_struct *tty;
 694         int status = urb->status;
 695
 696         mos7840_port = urb->context;
 697         if (!mos7840_port) {
 698                 dbg("%s", "NULL mos7840_port pointer");
 699                 mos7840_port->read_urb_busy = false;
 700                 return;
 701         }
 702
 703         if (status) {
 704                 dbg("nonzero read bulk status received: %d", status);
 705                 mos7840_port->read_urb_busy = false;
 706                 return;
 707         }
 708
 709         port = (struct usb_serial_port *)mos7840_port->port;
 710         if (mos7840_port_paranoia_check(port, __func__)) {
 711                 dbg("%s", "Port Paranoia failed");
 712                 mos7840_port->read_urb_busy = false;
 713                 return;
 714         }
 715
 716         serial = mos7840_get_usb_serial(port, __func__);
 717         if (!serial) {
 718                 dbg("%s", "Bad serial pointer");
 719                 mos7840_port->read_urb_busy = false;
 720                 return;
 721         }
 722
 723         dbg("%s", "Entering... ");
 724
 725         data = urb->transfer_buffer;
 726
 727         dbg("%s", "Entering ...........");
 728
 729         if (urb->actual_length) {
 730                 tty = tty_port_tty_get(&mos7840_port->port->port);
 731                 if (tty) {
 732                         tty_buffer_request_room(tty, urb->actual_length);
 733                         tty_insert_flip_string(tty, data, urb->actual_length);
 734                         dbg(" %s ", data);
 735                         tty_flip_buffer_push(tty);
 736                         tty_kref_put(tty);
 737                 }
 738                 mos7840_port->icount.rx += urb->actual_length;
 739                 smp_wmb();
 740                 dbg("mos7840_port->icount.rx is %d:",
 741                     mos7840_port->icount.rx);
 742         }
 743
 744         if (!mos7840_port->read_urb) {
 745                 dbg("%s", "URB KILLED !!!");
 746                 mos7840_port->read_urb_busy = false;
 747                 return;
 748         }
 749
 750
 751         mos7840_port->read_urb->dev = serial->dev;
 752
 753         mos7840_port->read_urb_busy = true;
 754         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 755
 756         if (retval) {
 757                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 758                 mos7840_port->read_urb_busy = false;
 759         }
 760 }
 761
 762 /*****************************************************************************
 763  * mos7840_bulk_out_data_callback
 764  *      this is the callback function for when we have finished sending
 765  *      serial data on the bulk out endpoint.
 766  *****************************************************************************/
 767
 768 static void mos7840_bulk_out_data_callback(struct urb *urb)
 769 {
 770         struct moschip_port *mos7840_port;
 771         struct tty_struct *tty;
 772         int status = urb->status;
 773         int i;
 774
 775         mos7840_port = urb->context;
 776         spin_lock(&mos7840_port->pool_lock);
 777         for (i = 0; i < NUM_URBS; i++) {
 778                 if (urb == mos7840_port->write_urb_pool[i]) {
 779                         mos7840_port->busy[i] = 0;
 780                         break;
 781                 }
 782         }
 783         spin_unlock(&mos7840_port->pool_lock);
 784
 785         if (status) {
 786                 dbg("nonzero write bulk status received:%d", status);
 787                 return;
 788         }
 789
 790         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 791                 dbg("%s", "Port Paranoia failed");
 792                 return;
 793         }
 794
 795         dbg("%s", "Entering .........");
 796
 797         tty = tty_port_tty_get(&mos7840_port->port->port);
 798         if (tty && mos7840_port->open)
 799                 tty_wakeup(tty);
 800         tty_kref_put(tty);
 801
 802 }
 803
 804 /************************************************************************/
 805 /*       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       */
 806 /************************************************************************/
 807 #ifdef MCSSerialProbe
 808 static int mos7840_serial_probe(struct usb_serial *serial,
 809                                 const struct usb_device_id *id)
 810 {
 811
 812         /*need to implement the mode_reg reading and updating\
 813            structures usb_serial_ device_type\
 814            (i.e num_ports, num_bulkin,bulkout etc) */
 815         /* Also we can update the changes  attach */
 816         return 1;
 817 }
 818 #endif
 819
 820 /*****************************************************************************
 821  * mos7840_open
 822  *      this function is called by the tty driver when a port is opened
 823  *      If successful, we return 0
 824  *      Otherwise we return a negative error number.
 825  *****************************************************************************/
 826
 827 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 828 {
 829         int response;
 830         int j;
 831         struct usb_serial *serial;
 832         struct urb *urb;
 833         __u16 Data;
 834         int status;
 835         struct moschip_port *mos7840_port;
 836         struct moschip_port *port0;
 837
 838         dbg ("%s enter", __func__);
 839
 840         if (mos7840_port_paranoia_check(port, __func__)) {
 841                 dbg("%s", "Port Paranoia failed");
 842                 return -ENODEV;
 843         }
 844
 845         serial = port->serial;
 846
 847         if (mos7840_serial_paranoia_check(serial, __func__)) {
 848                 dbg("%s", "Serial Paranoia failed");
 849                 return -ENODEV;
 850         }
 851
 852         mos7840_port = mos7840_get_port_private(port);
 853         port0 = mos7840_get_port_private(serial->port[0]);
 854
 855         if (mos7840_port == NULL || port0 == NULL)
 856                 return -ENODEV;
 857
 858         usb_clear_halt(serial->dev, port->write_urb->pipe);
 859         usb_clear_halt(serial->dev, port->read_urb->pipe);
 860         port0->open_ports++;
 861
 862         /* Initialising the write urb pool */
 863         for (j = 0; j < NUM_URBS; ++j) {
 864                 urb = usb_alloc_urb(0, GFP_KERNEL);
 865                 mos7840_port->write_urb_pool[j] = urb;
 866
 867                 if (urb == NULL) {
 868                         dev_err(&port->dev, "No more urbs???\n");
 869                         continue;
 870                 }
 871
 872                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 873                                                                 GFP_KERNEL);
 874                 if (!urb->transfer_buffer) {
 875                         usb_free_urb(urb);
 876                         mos7840_port->write_urb_pool[j] = NULL;
 877                         dev_err(&port->dev,
 878                                 "%s-out of memory for urb buffers.\n",
 879                                 __func__);
 880                         continue;
 881                 }
 882         }
 883
 884 /*****************************************************************************
 885  * Initialize MCS7840 -- Write Init values to corresponding Registers
 886  *
 887  * Register Index
 888  * 1 : IER
 889  * 2 : FCR
 890  * 3 : LCR
 891  * 4 : MCR
 892  *
 893  * 0x08 : SP1/2 Control Reg
 894  *****************************************************************************/
 895
 896         /* NEED to check the following Block */
 897
 898         Data = 0x0;
 899         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 900         if (status < 0) {
 901                 dbg("Reading Spreg failed");
 902                 return -1;
 903         }
 904         Data |= 0x80;
 905         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 906         if (status < 0) {
 907                 dbg("writing Spreg failed");
 908                 return -1;
 909         }
 910
 911         Data &= ~0x80;
 912         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 913         if (status < 0) {
 914                 dbg("writing Spreg failed");
 915                 return -1;
 916         }
 917         /* End of block to be checked */
 918
 919         Data = 0x0;
 920         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 921                                                                         &Data);
 922         if (status < 0) {
 923                 dbg("Reading Controlreg failed");
 924                 return -1;
 925         }
 926         Data |= 0x08;           /* Driver done bit */
 927         Data |= 0x20;           /* rx_disable */
 928         status = mos7840_set_reg_sync(port,
 929                                 mos7840_port->ControlRegOffset, Data);
 930         if (status < 0) {
 931                 dbg("writing Controlreg failed");
 932                 return -1;
 933         }
 934         /* do register settings here */
 935         /* Set all regs to the device default values. */
 936         /***********************************
 937          * First Disable all interrupts.
 938          ***********************************/
 939         Data = 0x00;
 940         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 941         if (status < 0) {
 942                 dbg("disabling interrupts failed");
 943                 return -1;
 944         }
 945         /* Set FIFO_CONTROL_REGISTER to the default value */
 946         Data = 0x00;
 947         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 948         if (status < 0) {
 949                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 950                 return -1;
 951         }
 952
 953         Data = 0xcf;
 954         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 955         if (status < 0) {
 956                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 957                 return -1;
 958         }
 959
 960         Data = 0x03;
 961         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 962         mos7840_port->shadowLCR = Data;
 963
 964         Data = 0x0b;
 965         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 966         mos7840_port->shadowMCR = Data;
 967
 968         Data = 0x00;
 969         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 970         mos7840_port->shadowLCR = Data;
 971
 972         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 973         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 974
 975         Data = 0x0c;
 976         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 977
 978         Data = 0x0;
 979         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 980
 981         Data = 0x00;
 982         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 983
 984         Data = Data & ~SERIAL_LCR_DLAB;
 985         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 986         mos7840_port->shadowLCR = Data;
 987
 988         /* clearing Bulkin and Bulkout Fifo */
 989         Data = 0x0;
 990         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 991
 992         Data = Data | 0x0c;
 993         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 994
 995         Data = Data & ~0x0c;
 996         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 997         /* Finally enable all interrupts */
 998         Data = 0x0c;
 999         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1000
1001         /* clearing rx_disable */
1002         Data = 0x0;
1003         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1004                                                                         &Data);
1005         Data = Data & ~0x20;
1006         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1007                                                                         Data);
1008
1009         /* rx_negate */
1010         Data = 0x0;
1011         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1012                                                                         &Data);
1013         Data = Data | 0x10;
1014         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1015                                                                         Data);
1016
1017         /* Check to see if we've set up our endpoint info yet    *
1018          * (can't set it up in mos7840_startup as the structures *
1019          * were not set up at that time.)                        */
1020         if (port0->open_ports == 1) {
1021                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1022                         /* set up interrupt urb */
1023                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1024                                 serial->dev,
1025                                 usb_rcvintpipe(serial->dev,
1026                                 serial->port[0]->interrupt_in_endpointAddress),
1027                                 serial->port[0]->interrupt_in_buffer,
1028                                 serial->port[0]->interrupt_in_urb->
1029                                 transfer_buffer_length,
1030                                 mos7840_interrupt_callback,
1031                                 serial,
1032                                 serial->port[0]->interrupt_in_urb->interval);
1033
1034                         /* start interrupt read for mos7840               *
1035                          * will continue as long as mos7840 is connected  */
1036
1037                         response =
1038                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1039                                            GFP_KERNEL);
1040                         if (response) {
1041                                 dev_err(&port->dev, "%s - Error %d submitting "
1042                                         "interrupt urb\n", __func__, response);
1043                         }
1044
1045                 }
1046
1047         }
1048
1049         /* see if we've set up our endpoint info yet   *
1050          * (can't set it up in mos7840_startup as the  *
1051          * structures were not set up at that time.)   */
1052
1053         dbg("port number is %d", port->number);
1054         dbg("serial number is %d", port->serial->minor);
1055         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1056         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1057         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1058         dbg("port's number in the device is %d", mos7840_port->port_num);
1059         mos7840_port->read_urb = port->read_urb;
1060
1061         /* set up our bulk in urb */
1062
1063         usb_fill_bulk_urb(mos7840_port->read_urb,
1064                           serial->dev,
1065                           usb_rcvbulkpipe(serial->dev,
1066                                           port->bulk_in_endpointAddress),
1067                           port->bulk_in_buffer,
1068                           mos7840_port->read_urb->transfer_buffer_length,
1069                           mos7840_bulk_in_callback, mos7840_port);
1070
1071         dbg("mos7840_open: bulkin endpoint is %d",
1072             port->bulk_in_endpointAddress);
1073         mos7840_port->read_urb_busy = true;
1074         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1075         if (response) {
1076                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1077                         __func__, response);
1078                 mos7840_port->read_urb_busy = false;
1079         }
1080
1081         /* initialize our wait queues */
1082         init_waitqueue_head(&mos7840_port->wait_chase);
1083         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1084
1085         /* initialize our icount structure */
1086         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1087
1088         /* initialize our port settings */
1089         /* Must set to enable ints! */
1090         mos7840_port->shadowMCR = MCR_MASTER_IE;
1091         /* send a open port command */
1092         mos7840_port->open = 1;
1093         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1094         mos7840_port->icount.tx = 0;
1095         mos7840_port->icount.rx = 0;
1096
1097         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1098                                 serial, mos7840_port, port);
1099
1100         dbg ("%s leave", __func__);
1101
1102         return 0;
1103
1104 }
1105
1106 /*****************************************************************************
1107  * mos7840_chars_in_buffer
1108  *      this function is called by the tty driver when it wants to know how many
1109  *      bytes of data we currently have outstanding in the port (data that has
1110  *      been written, but hasn't made it out the port yet)
1111  *      If successful, we return the number of bytes left to be written in the
1112  *      system,
1113  *      Otherwise we return zero.
1114  *****************************************************************************/
1115
1116 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1117 {
1118         struct usb_serial_port *port = tty->driver_data;
1119         int i;
1120         int chars = 0;
1121         unsigned long flags;
1122         struct moschip_port *mos7840_port;
1123
1124         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1125
1126         if (mos7840_port_paranoia_check(port, __func__)) {
1127                 dbg("%s", "Invalid port");
1128                 return 0;
1129         }
1130
1131         mos7840_port = mos7840_get_port_private(port);
1132         if (mos7840_port == NULL) {
1133                 dbg("%s", "mos7840_break:leaving ...........");
1134                 return 0;
1135         }
1136
1137         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1138         for (i = 0; i < NUM_URBS; ++i)
1139                 if (mos7840_port->busy[i])
1140                         chars += URB_TRANSFER_BUFFER_SIZE;
1141         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1142         dbg("%s - returns %d", __func__, chars);
1143         return chars;
1144
1145 }
1146
1147 /*****************************************************************************
1148  * mos7840_close
1149  *      this function is called by the tty driver when a port is closed
1150  *****************************************************************************/
1151
1152 static void mos7840_close(struct usb_serial_port *port)
1153 {
1154         struct usb_serial *serial;
1155         struct moschip_port *mos7840_port;
1156         struct moschip_port *port0;
1157         int j;
1158         __u16 Data;
1159
1160         dbg("%s", "mos7840_close:entering...");
1161
1162         if (mos7840_port_paranoia_check(port, __func__)) {
1163                 dbg("%s", "Port Paranoia failed");
1164                 return;
1165         }
1166
1167         serial = mos7840_get_usb_serial(port, __func__);
1168         if (!serial) {
1169                 dbg("%s", "Serial Paranoia failed");
1170                 return;
1171         }
1172
1173         mos7840_port = mos7840_get_port_private(port);
1174         port0 = mos7840_get_port_private(serial->port[0]);
1175
1176         if (mos7840_port == NULL || port0 == NULL)
1177                 return;
1178
1179         for (j = 0; j < NUM_URBS; ++j)
1180                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1181
1182         /* Freeing Write URBs */
1183         for (j = 0; j < NUM_URBS; ++j) {
1184                 if (mos7840_port->write_urb_pool[j]) {
1185                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1186                                 kfree(mos7840_port->write_urb_pool[j]->
1187                                       transfer_buffer);
1188
1189                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1190                 }
1191         }
1192
1193         /* While closing port, shutdown all bulk read, write  *
1194          * and interrupt read if they exists                  */
1195         if (serial->dev) {
1196                 if (mos7840_port->write_urb) {
1197                         dbg("%s", "Shutdown bulk write");
1198                         usb_kill_urb(mos7840_port->write_urb);
1199                 }
1200                 if (mos7840_port->read_urb) {
1201                         dbg("%s", "Shutdown bulk read");
1202                         usb_kill_urb(mos7840_port->read_urb);
1203                         mos7840_port->read_urb_busy = false;
1204                 }
1205                 if ((&mos7840_port->control_urb)) {
1206                         dbg("%s", "Shutdown control read");
1207                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1208                 }
1209         }
1210 /*      if(mos7840_port->ctrl_buf != NULL) */
1211 /*              kfree(mos7840_port->ctrl_buf); */
1212         port0->open_ports--;
1213         dbg("mos7840_num_open_ports in close%d:in port%d",
1214             port0->open_ports, port->number);
1215         if (port0->open_ports == 0) {
1216                 if (serial->port[0]->interrupt_in_urb) {
1217                         dbg("%s", "Shutdown interrupt_in_urb");
1218                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1219                 }
1220         }
1221
1222         if (mos7840_port->write_urb) {
1223                 /* if this urb had a transfer buffer already (old tx) free it */
1224                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1225                         kfree(mos7840_port->write_urb->transfer_buffer);
1226                 usb_free_urb(mos7840_port->write_urb);
1227         }
1228
1229         Data = 0x0;
1230         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1231
1232         Data = 0x00;
1233         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1234
1235         mos7840_port->open = 0;
1236
1237         dbg("%s", "Leaving ............");
1238 }
1239
1240 /************************************************************************
1241  *
1242  * mos7840_block_until_chase_response
1243  *
1244  *      This function will block the close until one of the following:
1245  *              1. Response to our Chase comes from mos7840
1246  *              2. A timeout of 10 seconds without activity has expired
1247  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1248  *
1249  ************************************************************************/
1250
1251 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1252                                         struct moschip_port *mos7840_port)
1253 {
1254         int timeout = 1 * HZ;
1255         int wait = 10;
1256         int count;
1257
1258         while (1) {
1259                 count = mos7840_chars_in_buffer(tty);
1260
1261                 /* Check for Buffer status */
1262                 if (count <= 0)
1263                         return;
1264
1265                 /* Block the thread for a while */
1266                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1267                                                timeout);
1268                 /* No activity.. count down section */
1269                 wait--;
1270                 if (wait == 0) {
1271                         dbg("%s - TIMEOUT", __func__);
1272                         return;
1273                 } else {
1274                         /* Reset timeout value back to seconds */
1275                         wait = 10;
1276                 }
1277         }
1278
1279 }
1280
1281 /*****************************************************************************
1282  * mos7840_break
1283  *      this function sends a break to the port
1284  *****************************************************************************/
1285 static void mos7840_break(struct tty_struct *tty, int break_state)
1286 {
1287         struct usb_serial_port *port = tty->driver_data;
1288         unsigned char data;
1289         struct usb_serial *serial;
1290         struct moschip_port *mos7840_port;
1291
1292         dbg("%s", "Entering ...........");
1293         dbg("mos7840_break: Start");
1294
1295         if (mos7840_port_paranoia_check(port, __func__)) {
1296                 dbg("%s", "Port Paranoia failed");
1297                 return;
1298         }
1299
1300         serial = mos7840_get_usb_serial(port, __func__);
1301         if (!serial) {
1302                 dbg("%s", "Serial Paranoia failed");
1303                 return;
1304         }
1305
1306         mos7840_port = mos7840_get_port_private(port);
1307
1308         if (mos7840_port == NULL)
1309                 return;
1310
1311         if (serial->dev)
1312                 /* flush and block until tx is empty */
1313                 mos7840_block_until_chase_response(tty, mos7840_port);
1314
1315         if (break_state == -1)
1316                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1317         else
1318                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1319
1320         /* FIXME: no locking on shadowLCR anywhere in driver */
1321         mos7840_port->shadowLCR = data;
1322         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1323             mos7840_port->shadowLCR);
1324         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1325                              mos7840_port->shadowLCR);
1326
1327         return;
1328 }
1329
1330 /*****************************************************************************
1331  * mos7840_write_room
1332  *      this function is called by the tty driver when it wants to know how many
1333  *      bytes of data we can accept for a specific port.
1334  *      If successful, we return the amount of room that we have for this port
1335  *      Otherwise we return a negative error number.
1336  *****************************************************************************/
1337
1338 static int mos7840_write_room(struct tty_struct *tty)
1339 {
1340         struct usb_serial_port *port = tty->driver_data;
1341         int i;
1342         int room = 0;
1343         unsigned long flags;
1344         struct moschip_port *mos7840_port;
1345
1346         dbg("%s", " mos7840_write_room:entering ...........");
1347
1348         if (mos7840_port_paranoia_check(port, __func__)) {
1349                 dbg("%s", "Invalid port");
1350                 dbg("%s", " mos7840_write_room:leaving ...........");
1351                 return -1;
1352         }
1353
1354         mos7840_port = mos7840_get_port_private(port);
1355         if (mos7840_port == NULL) {
1356                 dbg("%s", "mos7840_break:leaving ...........");
1357                 return -1;
1358         }
1359
1360         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1361         for (i = 0; i < NUM_URBS; ++i) {
1362                 if (!mos7840_port->busy[i])
1363                         room += URB_TRANSFER_BUFFER_SIZE;
1364         }
1365         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1366
1367         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1368         dbg("%s - returns %d", __func__, room);
1369         return room;
1370
1371 }
1372
1373 /*****************************************************************************
1374  * mos7840_write
1375  *      this function is called by the tty driver when data should be written to
1376  *      the port.
1377  *      If successful, we return the number of bytes written, otherwise we
1378  *      return a negative error number.
1379  *****************************************************************************/
1380
1381 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1382                          const unsigned char *data, int count)
1383 {
1384         int status;
1385         int i;
1386         int bytes_sent = 0;
1387         int transfer_size;
1388         unsigned long flags;
1389
1390         struct moschip_port *mos7840_port;
1391         struct usb_serial *serial;
1392         struct urb *urb;
1393         /* __u16 Data; */
1394         const unsigned char *current_position = data;
1395         unsigned char *data1;
1396         dbg("%s", "entering ...........");
1397         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1398                                         mos7840_port->shadowLCR); */
1399
1400 #ifdef NOTMOS7840
1401         Data = 0x00;
1402         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1403         mos7840_port->shadowLCR = Data;
1404         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1405         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1406             mos7840_port->shadowLCR);
1407
1408         /* Data = 0x03; */
1409         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1410         /* mos7840_port->shadowLCR=Data;//Need to add later */
1411
1412         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1413         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1414
1415         /* Data = 0x0c; */
1416         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1417         Data = 0x00;
1418         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1419         dbg("mos7840_write:DLL value is %x", Data);
1420
1421         Data = 0x0;
1422         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1423         dbg("mos7840_write:DLM value is %x", Data);
1424
1425         Data = Data & ~SERIAL_LCR_DLAB;
1426         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1427             mos7840_port->shadowLCR);
1428         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1429 #endif
1430
1431         if (mos7840_port_paranoia_check(port, __func__)) {
1432                 dbg("%s", "Port Paranoia failed");
1433                 return -1;
1434         }
1435
1436         serial = port->serial;
1437         if (mos7840_serial_paranoia_check(serial, __func__)) {
1438                 dbg("%s", "Serial Paranoia failed");
1439                 return -1;
1440         }
1441
1442         mos7840_port = mos7840_get_port_private(port);
1443         if (mos7840_port == NULL) {
1444                 dbg("%s", "mos7840_port is NULL");
1445                 return -1;
1446         }
1447
1448         /* try to find a free urb in the list */
1449         urb = NULL;
1450
1451         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1452         for (i = 0; i < NUM_URBS; ++i) {
1453                 if (!mos7840_port->busy[i]) {
1454                         mos7840_port->busy[i] = 1;
1455                         urb = mos7840_port->write_urb_pool[i];
1456                         dbg("URB:%d", i);
1457                         break;
1458                 }
1459         }
1460         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1461
1462         if (urb == NULL) {
1463                 dbg("%s - no more free urbs", __func__);
1464                 goto exit;
1465         }
1466
1467         if (urb->transfer_buffer == NULL) {
1468                 urb->transfer_buffer =
1469                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1470
1471                 if (urb->transfer_buffer == NULL) {
1472                         dev_err(&port->dev, "%s no more kernel memory...\n",
1473                                 __func__);
1474                         goto exit;
1475                 }
1476         }
1477         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1478
1479         memcpy(urb->transfer_buffer, current_position, transfer_size);
1480
1481         /* fill urb with data and submit  */
1482         usb_fill_bulk_urb(urb,
1483                           serial->dev,
1484                           usb_sndbulkpipe(serial->dev,
1485                                           port->bulk_out_endpointAddress),
1486                           urb->transfer_buffer,
1487                           transfer_size,
1488                           mos7840_bulk_out_data_callback, mos7840_port);
1489
1490         data1 = urb->transfer_buffer;
1491         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1492
1493         /* send it down the pipe */
1494         status = usb_submit_urb(urb, GFP_ATOMIC);
1495
1496         if (status) {
1497                 mos7840_port->busy[i] = 0;
1498                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1499                         "with status = %d\n", __func__, status);
1500                 bytes_sent = status;
1501                 goto exit;
1502         }
1503         bytes_sent = transfer_size;
1504         mos7840_port->icount.tx += transfer_size;
1505         smp_wmb();
1506         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1507 exit:
1508         return bytes_sent;
1509
1510 }
1511
1512 /*****************************************************************************
1513  * mos7840_throttle
1514  *      this function is called by the tty driver when it wants to stop the data
1515  *      being read from the port.
1516  *****************************************************************************/
1517
1518 static void mos7840_throttle(struct tty_struct *tty)
1519 {
1520         struct usb_serial_port *port = tty->driver_data;
1521         struct moschip_port *mos7840_port;
1522         int status;
1523
1524         if (mos7840_port_paranoia_check(port, __func__)) {
1525                 dbg("%s", "Invalid port");
1526                 return;
1527         }
1528
1529         dbg("- port %d", port->number);
1530
1531         mos7840_port = mos7840_get_port_private(port);
1532
1533         if (mos7840_port == NULL)
1534                 return;
1535
1536         if (!mos7840_port->open) {
1537                 dbg("%s", "port not opened");
1538                 return;
1539         }
1540
1541         dbg("%s", "Entering ..........");
1542
1543         /* if we are implementing XON/XOFF, send the stop character */
1544         if (I_IXOFF(tty)) {
1545                 unsigned char stop_char = STOP_CHAR(tty);
1546                 status = mos7840_write(tty, port, &stop_char, 1);
1547                 if (status <= 0)
1548                         return;
1549         }
1550         /* if we are implementing RTS/CTS, toggle that line */
1551         if (tty->termios->c_cflag & CRTSCTS) {
1552                 mos7840_port->shadowMCR &= ~MCR_RTS;
1553                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1554                                          mos7840_port->shadowMCR);
1555                 if (status < 0)
1556                         return;
1557         }
1558
1559         return;
1560 }
1561
1562 /*****************************************************************************
1563  * mos7840_unthrottle
1564  *      this function is called by the tty driver when it wants to resume
1565  *      the data being read from the port (called after mos7840_throttle is
1566  *      called)
1567  *****************************************************************************/
1568 static void mos7840_unthrottle(struct tty_struct *tty)
1569 {
1570         struct usb_serial_port *port = tty->driver_data;
1571         int status;
1572         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1573
1574         if (mos7840_port_paranoia_check(port, __func__)) {
1575                 dbg("%s", "Invalid port");
1576                 return;
1577         }
1578
1579         if (mos7840_port == NULL)
1580                 return;
1581
1582         if (!mos7840_port->open) {
1583                 dbg("%s - port not opened", __func__);
1584                 return;
1585         }
1586
1587         dbg("%s", "Entering ..........");
1588
1589         /* if we are implementing XON/XOFF, send the start character */
1590         if (I_IXOFF(tty)) {
1591                 unsigned char start_char = START_CHAR(tty);
1592                 status = mos7840_write(tty, port, &start_char, 1);
1593                 if (status <= 0)
1594                         return;
1595         }
1596
1597         /* if we are implementing RTS/CTS, toggle that line */
1598         if (tty->termios->c_cflag & CRTSCTS) {
1599                 mos7840_port->shadowMCR |= MCR_RTS;
1600                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1601                                          mos7840_port->shadowMCR);
1602                 if (status < 0)
1603                         return;
1604         }
1605 }
1606
1607 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1608 {
1609         struct usb_serial_port *port = tty->driver_data;
1610         struct moschip_port *mos7840_port;
1611         unsigned int result;
1612         __u16 msr;
1613         __u16 mcr;
1614         int status;
1615         mos7840_port = mos7840_get_port_private(port);
1616
1617         dbg("%s - port %d", __func__, port->number);
1618
1619         if (mos7840_port == NULL)
1620                 return -ENODEV;
1621
1622         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1623         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1624         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1625             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1626             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1627             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1628             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1629             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1630             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1631
1632         dbg("%s - 0x%04X", __func__, result);
1633
1634         return result;
1635 }
1636
1637 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1638                             unsigned int set, unsigned int clear)
1639 {
1640         struct usb_serial_port *port = tty->driver_data;
1641         struct moschip_port *mos7840_port;
1642         unsigned int mcr;
1643         int status;
1644
1645         dbg("%s - port %d", __func__, port->number);
1646
1647         mos7840_port = mos7840_get_port_private(port);
1648
1649         if (mos7840_port == NULL)
1650                 return -ENODEV;
1651
1652         /* FIXME: What locks the port registers ? */
1653         mcr = mos7840_port->shadowMCR;
1654         if (clear & TIOCM_RTS)
1655                 mcr &= ~MCR_RTS;
1656         if (clear & TIOCM_DTR)
1657                 mcr &= ~MCR_DTR;
1658         if (clear & TIOCM_LOOP)
1659                 mcr &= ~MCR_LOOPBACK;
1660
1661         if (set & TIOCM_RTS)
1662                 mcr |= MCR_RTS;
1663         if (set & TIOCM_DTR)
1664                 mcr |= MCR_DTR;
1665         if (set & TIOCM_LOOP)
1666                 mcr |= MCR_LOOPBACK;
1667
1668         mos7840_port->shadowMCR = mcr;
1669
1670         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1671         if (status < 0) {
1672                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1673                 return status;
1674         }
1675
1676         return 0;
1677 }
1678
1679 /*****************************************************************************
1680  * mos7840_calc_baud_rate_divisor
1681  *      this function calculates the proper baud rate divisor for the specified
1682  *      baud rate.
1683  *****************************************************************************/
1684 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1685                                           __u16 *clk_sel_val)
1686 {
1687
1688         dbg("%s - %d", __func__, baudRate);
1689
1690         if (baudRate <= 115200) {
1691                 *divisor = 115200 / baudRate;
1692                 *clk_sel_val = 0x0;
1693         }
1694         if ((baudRate > 115200) && (baudRate <= 230400)) {
1695                 *divisor = 230400 / baudRate;
1696                 *clk_sel_val = 0x10;
1697         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1698                 *divisor = 403200 / baudRate;
1699                 *clk_sel_val = 0x20;
1700         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1701                 *divisor = 460800 / baudRate;
1702                 *clk_sel_val = 0x30;
1703         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1704                 *divisor = 806400 / baudRate;
1705                 *clk_sel_val = 0x40;
1706         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1707                 *divisor = 921600 / baudRate;
1708                 *clk_sel_val = 0x50;
1709         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1710                 *divisor = 1572864 / baudRate;
1711                 *clk_sel_val = 0x60;
1712         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1713                 *divisor = 3145728 / baudRate;
1714                 *clk_sel_val = 0x70;
1715         }
1716         return 0;
1717
1718 #ifdef NOTMCS7840
1719
1720         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1721                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1722                         *divisor = mos7840_divisor_table[i].Divisor;
1723                         return 0;
1724                 }
1725         }
1726
1727         /* After trying for all the standard baud rates    *
1728          * Try calculating the divisor for this baud rate  */
1729
1730         if (baudrate > 75 && baudrate < 230400) {
1731                 /* get the divisor */
1732                 custom = (__u16) (230400L / baudrate);
1733
1734                 /* Check for round off */
1735                 round1 = (__u16) (2304000L / baudrate);
1736                 round = (__u16) (round1 - (custom * 10));
1737                 if (round > 4)
1738                         custom++;
1739                 *divisor = custom;
1740
1741                 dbg(" Baud %d = %d", baudrate, custom);
1742                 return 0;
1743         }
1744
1745         dbg("%s", " Baud calculation Failed...");
1746         return -1;
1747 #endif
1748 }
1749
1750 /*****************************************************************************
1751  * mos7840_send_cmd_write_baud_rate
1752  *      this function sends the proper command to change the baud rate of the
1753  *      specified port.
1754  *****************************************************************************/
1755
1756 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1757                                             int baudRate)
1758 {
1759         int divisor = 0;
1760         int status;
1761         __u16 Data;
1762         unsigned char number;
1763         __u16 clk_sel_val;
1764         struct usb_serial_port *port;
1765
1766         if (mos7840_port == NULL)
1767                 return -1;
1768
1769         port = (struct usb_serial_port *)mos7840_port->port;
1770         if (mos7840_port_paranoia_check(port, __func__)) {
1771                 dbg("%s", "Invalid port");
1772                 return -1;
1773         }
1774
1775         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1776                 dbg("%s", "Invalid Serial");
1777                 return -1;
1778         }
1779
1780         dbg("%s", "Entering ..........");
1781
1782         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1783
1784         dbg("%s - port = %d, baud = %d", __func__,
1785             mos7840_port->port->number, baudRate);
1786         /* reset clk_uart_sel in spregOffset */
1787         if (baudRate > 115200) {
1788 #ifdef HW_flow_control
1789                 /* NOTE: need to see the pther register to modify */
1790                 /* setting h/w flow control bit to 1 */
1791                 Data = 0x2b;
1792                 mos7840_port->shadowMCR = Data;
1793                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1794                                                                         Data);
1795                 if (status < 0) {
1796                         dbg("Writing spreg failed in set_serial_baud");
1797                         return -1;
1798                 }
1799 #endif
1800
1801         } else {
1802 #ifdef HW_flow_control
1803                 / *setting h/w flow control bit to 0 */
1804                 Data = 0xb;
1805                 mos7840_port->shadowMCR = Data;
1806                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1807                                                                         Data);
1808                 if (status < 0) {
1809                         dbg("Writing spreg failed in set_serial_baud");
1810                         return -1;
1811                 }
1812 #endif
1813
1814         }
1815
1816         if (1) {                /* baudRate <= 115200) */
1817                 clk_sel_val = 0x0;
1818                 Data = 0x0;
1819                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1820                                                    &clk_sel_val);
1821                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1822                                                                  &Data);
1823                 if (status < 0) {
1824                         dbg("reading spreg failed in set_serial_baud");
1825                         return -1;
1826                 }
1827                 Data = (Data & 0x8f) | clk_sel_val;
1828                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1829                                                                 Data);
1830                 if (status < 0) {
1831                         dbg("Writing spreg failed in set_serial_baud");
1832                         return -1;
1833                 }
1834                 /* Calculate the Divisor */
1835
1836                 if (status) {
1837                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1838                         return status;
1839                 }
1840                 /* Enable access to divisor latch */
1841                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1842                 mos7840_port->shadowLCR = Data;
1843                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1844
1845                 /* Write the divisor */
1846                 Data = (unsigned char)(divisor & 0xff);
1847                 dbg("set_serial_baud Value to write DLL is %x", Data);
1848                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1849
1850                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1851                 dbg("set_serial_baud Value to write DLM is %x", Data);
1852                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1853
1854                 /* Disable access to divisor latch */
1855                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1856                 mos7840_port->shadowLCR = Data;
1857                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1858
1859         }
1860         return status;
1861 }
1862
1863 /*****************************************************************************
1864  * mos7840_change_port_settings
1865  *      This routine is called to set the UART on the device to match
1866  *      the specified new settings.
1867  *****************************************************************************/
1868
1869 static void mos7840_change_port_settings(struct tty_struct *tty,
1870         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1871 {
1872         int baud;
1873         unsigned cflag;
1874         unsigned iflag;
1875         __u8 lData;
1876         __u8 lParity;
1877         __u8 lStop;
1878         int status;
1879         __u16 Data;
1880         struct usb_serial_port *port;
1881         struct usb_serial *serial;
1882
1883         if (mos7840_port == NULL)
1884                 return;
1885
1886         port = (struct usb_serial_port *)mos7840_port->port;
1887
1888         if (mos7840_port_paranoia_check(port, __func__)) {
1889                 dbg("%s", "Invalid port");
1890                 return;
1891         }
1892
1893         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1894                 dbg("%s", "Invalid Serial");
1895                 return;
1896         }
1897
1898         serial = port->serial;
1899
1900         dbg("%s - port %d", __func__, mos7840_port->port->number);
1901
1902         if (!mos7840_port->open) {
1903                 dbg("%s - port not opened", __func__);
1904                 return;
1905         }
1906
1907         dbg("%s", "Entering ..........");
1908
1909         lData = LCR_BITS_8;
1910         lStop = LCR_STOP_1;
1911         lParity = LCR_PAR_NONE;
1912
1913         cflag = tty->termios->c_cflag;
1914         iflag = tty->termios->c_iflag;
1915
1916         /* Change the number of bits */
1917         if (cflag & CSIZE) {
1918                 switch (cflag & CSIZE) {
1919                 case CS5:
1920                         lData = LCR_BITS_5;
1921                         break;
1922
1923                 case CS6:
1924                         lData = LCR_BITS_6;
1925                         break;
1926
1927                 case CS7:
1928                         lData = LCR_BITS_7;
1929                         break;
1930                 default:
1931                 case CS8:
1932                         lData = LCR_BITS_8;
1933                         break;
1934                 }
1935         }
1936         /* Change the Parity bit */
1937         if (cflag & PARENB) {
1938                 if (cflag & PARODD) {
1939                         lParity = LCR_PAR_ODD;
1940                         dbg("%s - parity = odd", __func__);
1941                 } else {
1942                         lParity = LCR_PAR_EVEN;
1943                         dbg("%s - parity = even", __func__);
1944                 }
1945
1946         } else {
1947                 dbg("%s - parity = none", __func__);
1948         }
1949
1950         if (cflag & CMSPAR)
1951                 lParity = lParity | 0x20;
1952
1953         /* Change the Stop bit */
1954         if (cflag & CSTOPB) {
1955                 lStop = LCR_STOP_2;
1956                 dbg("%s - stop bits = 2", __func__);
1957         } else {
1958                 lStop = LCR_STOP_1;
1959                 dbg("%s - stop bits = 1", __func__);
1960         }
1961
1962         /* Update the LCR with the correct value */
1963         mos7840_port->shadowLCR &=
1964             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1965         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1966
1967         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
1968             mos7840_port->shadowLCR);
1969         /* Disable Interrupts */
1970         Data = 0x00;
1971         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1972
1973         Data = 0x00;
1974         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1975
1976         Data = 0xcf;
1977         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1978
1979         /* Send the updated LCR value to the mos7840 */
1980         Data = mos7840_port->shadowLCR;
1981
1982         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1983
1984         Data = 0x00b;
1985         mos7840_port->shadowMCR = Data;
1986         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1987         Data = 0x00b;
1988         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1989
1990         /* set up the MCR register and send it to the mos7840 */
1991
1992         mos7840_port->shadowMCR = MCR_MASTER_IE;
1993         if (cflag & CBAUD)
1994                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1995
1996         if (cflag & CRTSCTS)
1997                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1998         else
1999                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2000
2001         Data = mos7840_port->shadowMCR;
2002         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2003
2004         /* Determine divisor based on baud rate */
2005         baud = tty_get_baud_rate(tty);
2006
2007         if (!baud) {
2008                 /* pick a default, any default... */
2009                 dbg("%s", "Picked default baud...");
2010                 baud = 9600;
2011         }
2012
2013         dbg("%s - baud rate = %d", __func__, baud);
2014         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2015
2016         /* Enable Interrupts */
2017         Data = 0x0c;
2018         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2019
2020         if (mos7840_port->read_urb_busy == false) {
2021                 mos7840_port->read_urb->dev = serial->dev;
2022                 mos7840_port->read_urb_busy = true;
2023                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2024                 if (status) {
2025                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2026                             status);
2027                         mos7840_port->read_urb_busy = false;
2028                 }
2029         }
2030         wake_up(&mos7840_port->delta_msr_wait);
2031         mos7840_port->delta_msr_cond = 1;
2032         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2033             mos7840_port->shadowLCR);
2034
2035         return;
2036 }
2037
2038 /*****************************************************************************
2039  * mos7840_set_termios
2040  *      this function is called by the tty driver when it wants to change
2041  *      the termios structure
2042  *****************************************************************************/
2043
2044 static void mos7840_set_termios(struct tty_struct *tty,
2045                                 struct usb_serial_port *port,
2046                                 struct ktermios *old_termios)
2047 {
2048         int status;
2049         unsigned int cflag;
2050         struct usb_serial *serial;
2051         struct moschip_port *mos7840_port;
2052         dbg("mos7840_set_termios: START");
2053         if (mos7840_port_paranoia_check(port, __func__)) {
2054                 dbg("%s", "Invalid port");
2055                 return;
2056         }
2057
2058         serial = port->serial;
2059
2060         if (mos7840_serial_paranoia_check(serial, __func__)) {
2061                 dbg("%s", "Invalid Serial");
2062                 return;
2063         }
2064
2065         mos7840_port = mos7840_get_port_private(port);
2066
2067         if (mos7840_port == NULL)
2068                 return;
2069
2070         if (!mos7840_port->open) {
2071                 dbg("%s - port not opened", __func__);
2072                 return;
2073         }
2074
2075         dbg("%s", "setting termios - ");
2076
2077         cflag = tty->termios->c_cflag;
2078
2079         dbg("%s - clfag %08x iflag %08x", __func__,
2080             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2081         dbg("%s - old clfag %08x old iflag %08x", __func__,
2082             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2083         dbg("%s - port %d", __func__, port->number);
2084
2085         /* change the port settings to the new ones specified */
2086
2087         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2088
2089         if (!mos7840_port->read_urb) {
2090                 dbg("%s", "URB KILLED !!!!!");
2091                 return;
2092         }
2093
2094         if (mos7840_port->read_urb_busy == false) {
2095                 mos7840_port->read_urb->dev = serial->dev;
2096                 mos7840_port->read_urb_busy = true;
2097                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2098                 if (status) {
2099                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2100                             status);
2101                         mos7840_port->read_urb_busy = false;
2102                 }
2103         }
2104         return;
2105 }
2106
2107 /*****************************************************************************
2108  * mos7840_get_lsr_info - get line status register info
2109  *
2110  * Purpose: Let user call ioctl() to get info when the UART physically
2111  *          is emptied.  On bus types like RS485, the transmitter must
2112  *          release the bus after transmitting. This must be done when
2113  *          the transmit shift register is empty, not be done when the
2114  *          transmit holding register is empty.  This functionality
2115  *          allows an RS485 driver to be written in user space.
2116  *****************************************************************************/
2117
2118 static int mos7840_get_lsr_info(struct tty_struct *tty,
2119                                 unsigned int __user *value)
2120 {
2121         int count;
2122         unsigned int result = 0;
2123
2124         count = mos7840_chars_in_buffer(tty);
2125         if (count == 0) {
2126                 dbg("%s -- Empty", __func__);
2127                 result = TIOCSER_TEMT;
2128         }
2129
2130         if (copy_to_user(value, &result, sizeof(int)))
2131                 return -EFAULT;
2132         return 0;
2133 }
2134
2135 /*****************************************************************************
2136  * mos7840_get_serial_info
2137  *      function to get information about serial port
2138  *****************************************************************************/
2139
2140 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2141                                    struct serial_struct __user *retinfo)
2142 {
2143         struct serial_struct tmp;
2144
2145         if (mos7840_port == NULL)
2146                 return -1;
2147
2148         if (!retinfo)
2149                 return -EFAULT;
2150
2151         memset(&tmp, 0, sizeof(tmp));
2152
2153         tmp.type = PORT_16550A;
2154         tmp.line = mos7840_port->port->serial->minor;
2155         tmp.port = mos7840_port->port->number;
2156         tmp.irq = 0;
2157         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2158         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2159         tmp.baud_base = 9600;
2160         tmp.close_delay = 5 * HZ;
2161         tmp.closing_wait = 30 * HZ;
2162
2163         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2164                 return -EFAULT;
2165         return 0;
2166 }
2167
2168 /*****************************************************************************
2169  * SerialIoctl
2170  *      this function handles any ioctl calls to the driver
2171  *****************************************************************************/
2172
2173 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2174                          unsigned int cmd, unsigned long arg)
2175 {
2176         struct usb_serial_port *port = tty->driver_data;
2177         void __user *argp = (void __user *)arg;
2178         struct moschip_port *mos7840_port;
2179
2180         struct async_icount cnow;
2181         struct async_icount cprev;
2182         struct serial_icounter_struct icount;
2183
2184         if (mos7840_port_paranoia_check(port, __func__)) {
2185                 dbg("%s", "Invalid port");
2186                 return -1;
2187         }
2188
2189         mos7840_port = mos7840_get_port_private(port);
2190
2191         if (mos7840_port == NULL)
2192                 return -1;
2193
2194         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2195
2196         switch (cmd) {
2197                 /* return number of bytes available */
2198
2199         case TIOCSERGETLSR:
2200                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2201                 return mos7840_get_lsr_info(tty, argp);
2202                 return 0;
2203
2204         case TIOCGSERIAL:
2205                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2206                 return mos7840_get_serial_info(mos7840_port, argp);
2207
2208         case TIOCSSERIAL:
2209                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2210                 break;
2211
2212         case TIOCMIWAIT:
2213                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2214                 cprev = mos7840_port->icount;
2215                 while (1) {
2216                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2217                         mos7840_port->delta_msr_cond = 0;
2218                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2219                                                  (mos7840_port->
2220                                                   delta_msr_cond == 1));
2221
2222                         /* see if a signal did it */
2223                         if (signal_pending(current))
2224                                 return -ERESTARTSYS;
2225                         cnow = mos7840_port->icount;
2226                         smp_rmb();
2227                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2228                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2229                                 return -EIO;    /* no change => error */
2230                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2231                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2232                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2233                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2234                                 return 0;
2235                         }
2236                         cprev = cnow;
2237                 }
2238                 /* NOTREACHED */
2239                 break;
2240
2241         case TIOCGICOUNT:
2242                 cnow = mos7840_port->icount;
2243                 smp_rmb();
2244                 icount.cts = cnow.cts;
2245                 icount.dsr = cnow.dsr;
2246                 icount.rng = cnow.rng;
2247                 icount.dcd = cnow.dcd;
2248                 icount.rx = cnow.rx;
2249                 icount.tx = cnow.tx;
2250                 icount.frame = cnow.frame;
2251                 icount.overrun = cnow.overrun;
2252                 icount.parity = cnow.parity;
2253                 icount.brk = cnow.brk;
2254                 icount.buf_overrun = cnow.buf_overrun;
2255
2256                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2257                     port->number, icount.rx, icount.tx);
2258                 if (copy_to_user(argp, &icount, sizeof(icount)))
2259                         return -EFAULT;
2260                 return 0;
2261         default:
2262                 break;
2263         }
2264         return -ENOIOCTLCMD;
2265 }
2266
2267 static int mos7840_calc_num_ports(struct usb_serial *serial)
2268 {
2269         int mos7840_num_ports = 0;
2270
2271         dbg("numberofendpoints: cur %d, alt %d",
2272             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2273             (int)serial->interface->altsetting->desc.bNumEndpoints);
2274         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2275                 mos7840_num_ports = serial->num_ports = 2;
2276         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2277                 serial->num_bulk_in = 4;
2278                 serial->num_bulk_out = 4;
2279                 mos7840_num_ports = serial->num_ports = 4;
2280         }
2281         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2282         return mos7840_num_ports;
2283 }
2284
2285 /****************************************************************************
2286  * mos7840_startup
2287  ****************************************************************************/
2288
2289 static int mos7840_startup(struct usb_serial *serial)
2290 {
2291         struct moschip_port *mos7840_port;
2292         struct usb_device *dev;
2293         int i, status;
2294
2295         __u16 Data;
2296         dbg("%s", "mos7840_startup :Entering..........");
2297
2298         if (!serial) {
2299                 dbg("%s", "Invalid Handler");
2300                 return -1;
2301         }
2302
2303         dev = serial->dev;
2304
2305         dbg("%s", "Entering...");
2306         dbg ("mos7840_startup: serial = %p", serial);
2307
2308         /* we set up the pointers to the endpoints in the mos7840_open *
2309          * function, as the structures aren't created yet.             */
2310
2311         /* set up port private structures */
2312         for (i = 0; i < serial->num_ports; ++i) {
2313                 dbg ("mos7840_startup: configuring port %d............", i);
2314                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2315                 if (mos7840_port == NULL) {
2316                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2317                         status = -ENOMEM;
2318                         i--; /* don't follow NULL pointer cleaning up */
2319                         goto error;
2320                 }
2321
2322                 /* Initialize all port interrupt end point to port 0 int
2323                  * endpoint. Our device has only one interrupt end point
2324                  * common to all port */
2325
2326                 mos7840_port->port = serial->port[i];
2327                 mos7840_set_port_private(serial->port[i], mos7840_port);
2328                 spin_lock_init(&mos7840_port->pool_lock);
2329
2330                 /* minor is not initialised until later by
2331                  * usb-serial.c:get_free_serial() and cannot therefore be used
2332                  * to index device instances */
2333                 mos7840_port->port_num = i + 1;
2334                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2335                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2336                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2337                 dbg ("serial->minor = %d", serial->minor);
2338
2339                 if (mos7840_port->port_num == 1) {
2340                         mos7840_port->SpRegOffset = 0x0;
2341                         mos7840_port->ControlRegOffset = 0x1;
2342                         mos7840_port->DcrRegOffset = 0x4;
2343                 } else if ((mos7840_port->port_num == 2)
2344                            && (serial->num_ports == 4)) {
2345                         mos7840_port->SpRegOffset = 0x8;
2346                         mos7840_port->ControlRegOffset = 0x9;
2347                         mos7840_port->DcrRegOffset = 0x16;
2348                 } else if ((mos7840_port->port_num == 2)
2349                            && (serial->num_ports == 2)) {
2350                         mos7840_port->SpRegOffset = 0xa;
2351                         mos7840_port->ControlRegOffset = 0xb;
2352                         mos7840_port->DcrRegOffset = 0x19;
2353                 } else if ((mos7840_port->port_num == 3)
2354                            && (serial->num_ports == 4)) {
2355                         mos7840_port->SpRegOffset = 0xa;
2356                         mos7840_port->ControlRegOffset = 0xb;
2357                         mos7840_port->DcrRegOffset = 0x19;
2358                 } else if ((mos7840_port->port_num == 4)
2359                            && (serial->num_ports == 4)) {
2360                         mos7840_port->SpRegOffset = 0xc;
2361                         mos7840_port->ControlRegOffset = 0xd;
2362                         mos7840_port->DcrRegOffset = 0x1c;
2363                 }
2364                 mos7840_dump_serial_port(mos7840_port);
2365                 mos7840_set_port_private(serial->port[i], mos7840_port);
2366
2367                 /* enable rx_disable bit in control register */
2368                 status = mos7840_get_reg_sync(serial->port[i],
2369                                  mos7840_port->ControlRegOffset, &Data);
2370                 if (status < 0) {
2371                         dbg("Reading ControlReg failed status-0x%x", status);
2372                         break;
2373                 } else
2374                         dbg("ControlReg Reading success val is %x, status%d",
2375                             Data, status);
2376                 Data |= 0x08;   /* setting driver done bit */
2377                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2378                                    modem status reg */
2379
2380                 /* Data |= 0x20; //rx_disable bit */
2381                 status = mos7840_set_reg_sync(serial->port[i],
2382                                          mos7840_port->ControlRegOffset, Data);
2383                 if (status < 0) {
2384                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2385                         break;
2386                 } else
2387                         dbg("ControlReg Writing success(rx_disable) status%d",
2388                             status);
2389
2390                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2391                    and 0x24 in DCR3 */
2392                 Data = 0x01;
2393                 status = mos7840_set_reg_sync(serial->port[i],
2394                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2395                 if (status < 0) {
2396                         dbg("Writing DCR0 failed status-0x%x", status);
2397                         break;
2398                 } else
2399                         dbg("DCR0 Writing success status%d", status);
2400
2401                 Data = 0x05;
2402                 status = mos7840_set_reg_sync(serial->port[i],
2403                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2404                 if (status < 0) {
2405                         dbg("Writing DCR1 failed status-0x%x", status);
2406                         break;
2407                 } else
2408                         dbg("DCR1 Writing success status%d", status);
2409
2410                 Data = 0x24;
2411                 status = mos7840_set_reg_sync(serial->port[i],
2412                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2413                 if (status < 0) {
2414                         dbg("Writing DCR2 failed status-0x%x", status);
2415                         break;
2416                 } else
2417                         dbg("DCR2 Writing success status%d", status);
2418
2419                 /* write values in clkstart0x0 and clkmulti 0x20 */
2420                 Data = 0x0;
2421                 status = mos7840_set_reg_sync(serial->port[i],
2422                                          CLK_START_VALUE_REGISTER, Data);
2423                 if (status < 0) {
2424                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2425                         break;
2426                 } else
2427                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2428
2429                 Data = 0x20;
2430                 status = mos7840_set_reg_sync(serial->port[i],
2431                                         CLK_MULTI_REGISTER, Data);
2432                 if (status < 0) {
2433                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2434                             status);
2435                         goto error;
2436                 } else
2437                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2438                             status);
2439
2440                 /* write value 0x0 to scratchpad register */
2441                 Data = 0x00;
2442                 status = mos7840_set_uart_reg(serial->port[i],
2443                                                 SCRATCH_PAD_REGISTER, Data);
2444                 if (status < 0) {
2445                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2446                             status);
2447                         break;
2448                 } else
2449                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2450                             status);
2451
2452                 /* Zero Length flag register */
2453                 if ((mos7840_port->port_num != 1)
2454                     && (serial->num_ports == 2)) {
2455
2456                         Data = 0xff;
2457                         status = mos7840_set_reg_sync(serial->port[i],
2458                                       (__u16) (ZLP_REG1 +
2459                                       ((__u16)mos7840_port->port_num)), Data);
2460                         dbg("ZLIP offset %x",
2461                             (__u16) (ZLP_REG1 +
2462                                         ((__u16) mos7840_port->port_num)));
2463                         if (status < 0) {
2464                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2465                                     i + 2, status);
2466                                 break;
2467                         } else
2468                                 dbg("ZLP_REG%d Writing success status%d",
2469                                     i + 2, status);
2470                 } else {
2471                         Data = 0xff;
2472                         status = mos7840_set_reg_sync(serial->port[i],
2473                               (__u16) (ZLP_REG1 +
2474                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2475                         dbg("ZLIP offset %x",
2476                             (__u16) (ZLP_REG1 +
2477                                      ((__u16) mos7840_port->port_num) - 0x1));
2478                         if (status < 0) {
2479                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2480                                     i + 1, status);
2481                                 break;
2482                         } else
2483                                 dbg("ZLP_REG%d Writing success status%d",
2484                                     i + 1, status);
2485
2486                 }
2487                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2488                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2489                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2490                                                                 GFP_KERNEL);
2491                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2492                                                         !mos7840_port->dr) {
2493                         status = -ENOMEM;
2494                         goto error;
2495                 }
2496         }
2497         dbg ("mos7840_startup: all ports configured...........");
2498
2499         /* Zero Length flag enable */
2500         Data = 0x0f;
2501         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2502         if (status < 0) {
2503                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2504                 goto error;
2505         } else
2506                 dbg("ZLP_REG5 Writing success status%d", status);
2507
2508         /* setting configuration feature to one */
2509         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2510                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2511         return 0;
2512 error:
2513         for (/* nothing */; i >= 0; i--) {
2514                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2515
2516                 kfree(mos7840_port->dr);
2517                 kfree(mos7840_port->ctrl_buf);
2518                 usb_free_urb(mos7840_port->control_urb);
2519                 kfree(mos7840_port);
2520                 serial->port[i] = NULL;
2521         }
2522         return status;
2523 }
2524
2525 /****************************************************************************
2526  * mos7840_disconnect
2527  *      This function is called whenever the device is removed from the usb bus.
2528  ****************************************************************************/
2529
2530 static void mos7840_disconnect(struct usb_serial *serial)
2531 {
2532         int i;
2533         unsigned long flags;
2534         struct moschip_port *mos7840_port;
2535         dbg("%s", " disconnect :entering..........");
2536
2537         if (!serial) {
2538                 dbg("%s", "Invalid Handler");
2539                 return;
2540         }
2541
2542         /* check for the ports to be closed,close the ports and disconnect */
2543
2544         /* free private structure allocated for serial port  *
2545          * stop reads and writes on all ports                */
2546
2547         for (i = 0; i < serial->num_ports; ++i) {
2548                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2549                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2550                 if (mos7840_port) {
2551                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2552                         mos7840_port->zombie = 1;
2553                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2554                         usb_kill_urb(mos7840_port->control_urb);
2555                 }
2556         }
2557
2558         dbg("%s", "Thank u :: ");
2559
2560 }
2561
2562 /****************************************************************************
2563  * mos7840_release
2564  *      This function is called when the usb_serial structure is freed.
2565  ****************************************************************************/
2566
2567 static void mos7840_release(struct usb_serial *serial)
2568 {
2569         int i;
2570         struct moschip_port *mos7840_port;
2571         dbg("%s", " release :entering..........");
2572
2573         if (!serial) {
2574                 dbg("%s", "Invalid Handler");
2575                 return;
2576         }
2577
2578         /* check for the ports to be closed,close the ports and disconnect */
2579
2580         /* free private structure allocated for serial port  *
2581          * stop reads and writes on all ports                */
2582
2583         for (i = 0; i < serial->num_ports; ++i) {
2584                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2585                 dbg("mos7840_port %d = %p", i, mos7840_port);
2586                 if (mos7840_port) {
2587                         kfree(mos7840_port->ctrl_buf);
2588                         kfree(mos7840_port->dr);
2589                         kfree(mos7840_port);
2590                 }
2591         }
2592
2593         dbg("%s", "Thank u :: ");
2594
2595 }
2596
2597 static struct usb_driver io_driver = {
2598         .name = "mos7840",
2599         .probe = usb_serial_probe,
2600         .disconnect = usb_serial_disconnect,
2601         .id_table = moschip_id_table_combined,
2602         .no_dynamic_id = 1,
2603 };
2604
2605 static struct usb_serial_driver moschip7840_4port_device = {
2606         .driver = {
2607                    .owner = THIS_MODULE,
2608                    .name = "mos7840",
2609                    },
2610         .description = DRIVER_DESC,
2611         .usb_driver = &io_driver,
2612         .id_table = moschip_port_id_table,
2613         .num_ports = 4,
2614         .open = mos7840_open,
2615         .close = mos7840_close,
2616         .write = mos7840_write,
2617         .write_room = mos7840_write_room,
2618         .chars_in_buffer = mos7840_chars_in_buffer,
2619         .throttle = mos7840_throttle,
2620         .unthrottle = mos7840_unthrottle,
2621         .calc_num_ports = mos7840_calc_num_ports,
2622 #ifdef MCSSerialProbe
2623         .probe = mos7840_serial_probe,
2624 #endif
2625         .ioctl = mos7840_ioctl,
2626         .set_termios = mos7840_set_termios,
2627         .break_ctl = mos7840_break,
2628         .tiocmget = mos7840_tiocmget,
2629         .tiocmset = mos7840_tiocmset,
2630         .attach = mos7840_startup,
2631         .disconnect = mos7840_disconnect,
2632         .release = mos7840_release,
2633         .read_bulk_callback = mos7840_bulk_in_callback,
2634         .read_int_callback = mos7840_interrupt_callback,
2635 };
2636
2637 /****************************************************************************
2638  * moschip7840_init
2639  *      This is called by the module subsystem, or on startup to initialize us
2640  ****************************************************************************/
2641 static int __init moschip7840_init(void)
2642 {
2643         int retval;
2644
2645         dbg("%s", " mos7840_init :entering..........");
2646
2647         /* Register with the usb serial */
2648         retval = usb_serial_register(&moschip7840_4port_device);
2649
2650         if (retval)
2651                 goto failed_port_device_register;
2652
2653         dbg("%s", "Entering...");
2654         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2655                DRIVER_DESC "\n");
2656
2657         /* Register with the usb */
2658         retval = usb_register(&io_driver);
2659         if (retval == 0) {
2660                 dbg("%s", "Leaving...");
2661                 return 0;
2662         }
2663         usb_serial_deregister(&moschip7840_4port_device);
2664 failed_port_device_register:
2665         return retval;
2666 }
2667
2668 /****************************************************************************
2669  * moschip7840_exit
2670  *      Called when the driver is about to be unloaded.
2671  ****************************************************************************/
2672 static void __exit moschip7840_exit(void)
2673 {
2674
2675         dbg("%s", " mos7840_exit :entering..........");
2676
2677         usb_deregister(&io_driver);
2678
2679         usb_serial_deregister(&moschip7840_4port_device);
2680
2681         dbg("%s", "Entering...");
2682 }
2683
2684 module_init(moschip7840_init);
2685 module_exit(moschip7840_exit);
2686
2687 /* Module information */
2688 MODULE_DESCRIPTION(DRIVER_DESC);
2689 MODULE_LICENSE("GPL");
2690
2691 module_param(debug, bool, S_IRUGO | S_IWUSR);
2692 MODULE_PARM_DESC(debug, "Debug enabled or not");