git.oblomov.eu Git - linux-2.6/blob - drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.2"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 106 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 /* The native mos7840/7820 component */
 114 #define USB_VENDOR_ID_MOSCHIP           0x9710
 115 #define MOSCHIP_DEVICE_ID_7840          0x7840
 116 #define MOSCHIP_DEVICE_ID_7820          0x7820
 117 /* The native component can have its vendor/device id's overridden
 118  * in vendor-specific implementations.  Such devices can be handled
 119  * by making a change here, in moschip_port_id_table, and in
 120  * moschip_id_table_combined
 121  */
 122 #define USB_VENDOR_ID_BANDB             0x0856
 123 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 124 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 125
 126 /* This driver also supports the ATEN UC2324 device since it is mos7840 based
 127  *  - if I knew the device id it would also support the ATEN UC2322 */
 128 #define USB_VENDOR_ID_ATENINTL          0x0557
 129 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 130
 131 /* Interrupt Routine Defines    */
 132
 133 #define SERIAL_IIR_RLS      0x06
 134 #define SERIAL_IIR_MS       0x00
 135
 136 /*
 137  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 138  */
 139 #define SERIAL_LSR_DR       0x0001
 140 #define SERIAL_LSR_OE       0x0002
 141 #define SERIAL_LSR_PE       0x0004
 142 #define SERIAL_LSR_FE       0x0008
 143 #define SERIAL_LSR_BI       0x0010
 144
 145 #define MOS_MSR_DELTA_CTS   0x10
 146 #define MOS_MSR_DELTA_DSR   0x20
 147 #define MOS_MSR_DELTA_RI    0x40
 148 #define MOS_MSR_DELTA_CD    0x80
 149
 150 /* Serial Port register Address */
 151 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 152 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 153 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 154 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 155 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 156 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 157 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 158 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 159 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 160
 161 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 162 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 163
 164 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 165
 166 /*
 167  * URB POOL related defines
 168  */
 169 #define NUM_URBS                        16      /* URB Count */
 170 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 171
 172
 173 static struct usb_device_id moschip_port_id_table[] = {
 174         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 175         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 176         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 177         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 178         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 179         {}                      /* terminating entry */
 180 };
 181
 182 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 183         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 184         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 185         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 186         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 187         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 188         {}                      /* terminating entry */
 189 };
 190
 191 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 192
 193 /* This structure holds all of the local port information */
 194
 195 struct moschip_port {
 196         int port_num;           /*Actual port number in the device(1,2,etc) */
 197         struct urb *write_urb;  /* write URB for this port */
 198         struct urb *read_urb;   /* read URB for this port */
 199         struct urb *int_urb;
 200         __u8 shadowLCR;         /* last LCR value received */
 201         __u8 shadowMCR;         /* last MCR value received */
 202         char open;
 203         char open_ports;
 204         char zombie;
 205         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 206         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 207         int delta_msr_cond;
 208         struct async_icount icount;
 209         struct usb_serial_port *port;   /* loop back to the owner of this object */
 210
 211         /* Offsets */
 212         __u8 SpRegOffset;
 213         __u8 ControlRegOffset;
 214         __u8 DcrRegOffset;
 215         /* for processing control URBS in interrupt context */
 216         struct urb *control_urb;
 217         struct usb_ctrlrequest *dr;
 218         char *ctrl_buf;
 219         int MsrLsr;
 220
 221         spinlock_t pool_lock;
 222         struct urb *write_urb_pool[NUM_URBS];
 223         char busy[NUM_URBS];
 224         bool read_urb_busy;
 225 };
 226
 227
 228 static int debug;
 229
 230 /*
 231  * mos7840_set_reg_sync
 232  *      To set the Control register by calling usb_fill_control_urb function
 233  *      by passing usb_sndctrlpipe function as parameter.
 234  */
 235
 236 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 237                                 __u16 val)
 238 {
 239         struct usb_device *dev = port->serial->dev;
 240         val = val & 0x00ff;
 241         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 242
 243         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 244                                MCS_WR_RTYPE, val, reg, NULL, 0,
 245                                MOS_WDR_TIMEOUT);
 246 }
 247
 248 /*
 249  * mos7840_get_reg_sync
 250  *      To set the Uart register by calling usb_fill_control_urb function by
 251  *      passing usb_rcvctrlpipe function as parameter.
 252  */
 253
 254 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 255                                 __u16 *val)
 256 {
 257         struct usb_device *dev = port->serial->dev;
 258         int ret = 0;
 259
 260         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 261                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 262                               MOS_WDR_TIMEOUT);
 263         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 264         *val = (*val) & 0x00ff;
 265         return ret;
 266 }
 267
 268 /*
 269  * mos7840_set_uart_reg
 270  *      To set the Uart register by calling usb_fill_control_urb function by
 271  *      passing usb_sndctrlpipe function as parameter.
 272  */
 273
 274 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 275                                 __u16 val)
 276 {
 277
 278         struct usb_device *dev = port->serial->dev;
 279         val = val & 0x00ff;
 280         /* For the UART control registers, the application number need
 281            to be Or'ed */
 282         if (port->serial->num_ports == 4) {
 283                 val |= (((__u16) port->number -
 284                                 (__u16) (port->serial->minor)) + 1) << 8;
 285                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 286         } else {
 287                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 288                         val |= (((__u16) port->number -
 289                               (__u16) (port->serial->minor)) + 1) << 8;
 290                         dbg("mos7840_set_uart_reg application number is %x\n",
 291                             val);
 292                 } else {
 293                         val |=
 294                             (((__u16) port->number -
 295                               (__u16) (port->serial->minor)) + 2) << 8;
 296                         dbg("mos7840_set_uart_reg application number is %x\n",
 297                             val);
 298                 }
 299         }
 300         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 301                                MCS_WR_RTYPE, val, reg, NULL, 0,
 302                                MOS_WDR_TIMEOUT);
 303
 304 }
 305
 306 /*
 307  * mos7840_get_uart_reg
 308  *      To set the Control register by calling usb_fill_control_urb function
 309  *      by passing usb_rcvctrlpipe function as parameter.
 310  */
 311 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 312                                 __u16 *val)
 313 {
 314         struct usb_device *dev = port->serial->dev;
 315         int ret = 0;
 316         __u16 Wval;
 317
 318         /* dbg("application number is %4x \n",
 319             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 320         /* Wval  is same as application number */
 321         if (port->serial->num_ports == 4) {
 322                 Wval =
 323                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 324                      1) << 8;
 325                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 326         } else {
 327                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 328                         Wval = (((__u16) port->number -
 329                               (__u16) (port->serial->minor)) + 1) << 8;
 330                         dbg("mos7840_get_uart_reg application number is %x\n",
 331                             Wval);
 332                 } else {
 333                         Wval = (((__u16) port->number -
 334                               (__u16) (port->serial->minor)) + 2) << 8;
 335                         dbg("mos7840_get_uart_reg application number is %x\n",
 336                             Wval);
 337                 }
 338         }
 339         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 340                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 341                               MOS_WDR_TIMEOUT);
 342         *val = (*val) & 0x00ff;
 343         return ret;
 344 }
 345
 346 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 347 {
 348
 349         dbg("***************************************\n");
 350         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 351         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 352         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 353         dbg("***************************************\n");
 354
 355 }
 356
 357 /************************************************************************/
 358 /************************************************************************/
 359 /*             I N T E R F A C E   F U N C T I O N S                    */
 360 /*             I N T E R F A C E   F U N C T I O N S                    */
 361 /************************************************************************/
 362 /************************************************************************/
 363
 364 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 365                                             struct moschip_port *data)
 366 {
 367         usb_set_serial_port_data(port, (void *)data);
 368 }
 369
 370 static inline struct moschip_port *mos7840_get_port_private(struct
 371                                                             usb_serial_port
 372                                                             *port)
 373 {
 374         return (struct moschip_port *)usb_get_serial_port_data(port);
 375 }
 376
 377 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 378 {
 379         struct moschip_port *mos7840_port;
 380         struct async_icount *icount;
 381         mos7840_port = port;
 382         icount = &mos7840_port->icount;
 383         if (new_msr &
 384             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 385              MOS_MSR_DELTA_CD)) {
 386                 icount = &mos7840_port->icount;
 387
 388                 /* update input line counters */
 389                 if (new_msr & MOS_MSR_DELTA_CTS) {
 390                         icount->cts++;
 391                         smp_wmb();
 392                 }
 393                 if (new_msr & MOS_MSR_DELTA_DSR) {
 394                         icount->dsr++;
 395                         smp_wmb();
 396                 }
 397                 if (new_msr & MOS_MSR_DELTA_CD) {
 398                         icount->dcd++;
 399                         smp_wmb();
 400                 }
 401                 if (new_msr & MOS_MSR_DELTA_RI) {
 402                         icount->rng++;
 403                         smp_wmb();
 404                 }
 405         }
 406 }
 407
 408 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 409 {
 410         struct async_icount *icount;
 411
 412         dbg("%s - %02x", __func__, new_lsr);
 413
 414         if (new_lsr & SERIAL_LSR_BI) {
 415                 /*
 416                  * Parity and Framing errors only count if they
 417                  * occur exclusive of a break being
 418                  * received.
 419                  */
 420                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 421         }
 422
 423         /* update input line counters */
 424         icount = &port->icount;
 425         if (new_lsr & SERIAL_LSR_BI) {
 426                 icount->brk++;
 427                 smp_wmb();
 428         }
 429         if (new_lsr & SERIAL_LSR_OE) {
 430                 icount->overrun++;
 431                 smp_wmb();
 432         }
 433         if (new_lsr & SERIAL_LSR_PE) {
 434                 icount->parity++;
 435                 smp_wmb();
 436         }
 437         if (new_lsr & SERIAL_LSR_FE) {
 438                 icount->frame++;
 439                 smp_wmb();
 440         }
 441 }
 442
 443 /************************************************************************/
 444 /************************************************************************/
 445 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 446 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 447 /************************************************************************/
 448 /************************************************************************/
 449
 450 static void mos7840_control_callback(struct urb *urb)
 451 {
 452         unsigned char *data;
 453         struct moschip_port *mos7840_port;
 454         __u8 regval = 0x0;
 455         int result = 0;
 456         int status = urb->status;
 457
 458         mos7840_port = urb->context;
 459
 460         switch (status) {
 461         case 0:
 462                 /* success */
 463                 break;
 464         case -ECONNRESET:
 465         case -ENOENT:
 466         case -ESHUTDOWN:
 467                 /* this urb is terminated, clean up */
 468                 dbg("%s - urb shutting down with status: %d", __func__,
 469                     status);
 470                 return;
 471         default:
 472                 dbg("%s - nonzero urb status received: %d", __func__,
 473                     status);
 474                 goto exit;
 475         }
 476
 477         dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
 478         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 479             mos7840_port->MsrLsr, mos7840_port->port_num);
 480         data = urb->transfer_buffer;
 481         regval = (__u8) data[0];
 482         dbg("%s data is %x\n", __func__, regval);
 483         if (mos7840_port->MsrLsr == 0)
 484                 mos7840_handle_new_msr(mos7840_port, regval);
 485         else if (mos7840_port->MsrLsr == 1)
 486                 mos7840_handle_new_lsr(mos7840_port, regval);
 487
 488 exit:
 489         spin_lock(&mos7840_port->pool_lock);
 490         if (!mos7840_port->zombie)
 491                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 492         spin_unlock(&mos7840_port->pool_lock);
 493         if (result) {
 494                 dev_err(&urb->dev->dev,
 495                         "%s - Error %d submitting interrupt urb\n",
 496                         __func__, result);
 497         }
 498 }
 499
 500 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 501                            __u16 *val)
 502 {
 503         struct usb_device *dev = mcs->port->serial->dev;
 504         struct usb_ctrlrequest *dr = mcs->dr;
 505         unsigned char *buffer = mcs->ctrl_buf;
 506         int ret;
 507
 508         dr->bRequestType = MCS_RD_RTYPE;
 509         dr->bRequest = MCS_RDREQ;
 510         dr->wValue = cpu_to_le16(Wval); /* 0 */
 511         dr->wIndex = cpu_to_le16(reg);
 512         dr->wLength = cpu_to_le16(2);
 513
 514         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 515                              (unsigned char *)dr, buffer, 2,
 516                              mos7840_control_callback, mcs);
 517         mcs->control_urb->transfer_buffer_length = 2;
 518         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 519         return ret;
 520 }
 521
 522 /*****************************************************************************
 523  * mos7840_interrupt_callback
 524  *      this is the callback function for when we have received data on the
 525  *      interrupt endpoint.
 526  *****************************************************************************/
 527
 528 static void mos7840_interrupt_callback(struct urb *urb)
 529 {
 530         int result;
 531         int length;
 532         struct moschip_port *mos7840_port;
 533         struct usb_serial *serial;
 534         __u16 Data;
 535         unsigned char *data;
 536         __u8 sp[5], st;
 537         int i, rv = 0;
 538         __u16 wval, wreg = 0;
 539         int status = urb->status;
 540
 541         dbg("%s", " : Entering\n");
 542
 543         switch (status) {
 544         case 0:
 545                 /* success */
 546                 break;
 547         case -ECONNRESET:
 548         case -ENOENT:
 549         case -ESHUTDOWN:
 550                 /* this urb is terminated, clean up */
 551                 dbg("%s - urb shutting down with status: %d", __func__,
 552                     status);
 553                 return;
 554         default:
 555                 dbg("%s - nonzero urb status received: %d", __func__,
 556                     status);
 557                 goto exit;
 558         }
 559
 560         length = urb->actual_length;
 561         data = urb->transfer_buffer;
 562
 563         serial = urb->context;
 564
 565         /* Moschip get 5 bytes
 566          * Byte 1 IIR Port 1 (port.number is 0)
 567          * Byte 2 IIR Port 2 (port.number is 1)
 568          * Byte 3 IIR Port 3 (port.number is 2)
 569          * Byte 4 IIR Port 4 (port.number is 3)
 570          * Byte 5 FIFO status for both */
 571
 572         if (length && length > 5) {
 573                 dbg("%s \n", "Wrong data !!!");
 574                 return;
 575         }
 576
 577         sp[0] = (__u8) data[0];
 578         sp[1] = (__u8) data[1];
 579         sp[2] = (__u8) data[2];
 580         sp[3] = (__u8) data[3];
 581         st = (__u8) data[4];
 582
 583         for (i = 0; i < serial->num_ports; i++) {
 584                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 585                 wval =
 586                     (((__u16) serial->port[i]->number -
 587                       (__u16) (serial->minor)) + 1) << 8;
 588                 if (mos7840_port->open) {
 589                         if (sp[i] & 0x01) {
 590                                 dbg("SP%d No Interrupt !!!\n", i);
 591                         } else {
 592                                 switch (sp[i] & 0x0f) {
 593                                 case SERIAL_IIR_RLS:
 594                                         dbg("Serial Port %d: Receiver status error or ", i);
 595                                         dbg("address bit detected in 9-bit mode\n");
 596                                         mos7840_port->MsrLsr = 1;
 597                                         wreg = LINE_STATUS_REGISTER;
 598                                         break;
 599                                 case SERIAL_IIR_MS:
 600                                         dbg("Serial Port %d: Modem status change\n", i);
 601                                         mos7840_port->MsrLsr = 0;
 602                                         wreg = MODEM_STATUS_REGISTER;
 603                                         break;
 604                                 }
 605                                 spin_lock(&mos7840_port->pool_lock);
 606                                 if (!mos7840_port->zombie) {
 607                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 608                                 } else {
 609                                         spin_unlock(&mos7840_port->pool_lock);
 610                                         return;
 611                                 }
 612                                 spin_unlock(&mos7840_port->pool_lock);
 613                         }
 614                 }
 615         }
 616         if (!(rv < 0))
 617                 /* the completion handler for the control urb will resubmit */
 618                 return;
 619 exit:
 620         result = usb_submit_urb(urb, GFP_ATOMIC);
 621         if (result) {
 622                 dev_err(&urb->dev->dev,
 623                         "%s - Error %d submitting interrupt urb\n",
 624                         __func__, result);
 625         }
 626 }
 627
 628 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 629                                        const char *function)
 630 {
 631         if (!port) {
 632                 dbg("%s - port == NULL", function);
 633                 return -1;
 634         }
 635         if (!port->serial) {
 636                 dbg("%s - port->serial == NULL", function);
 637                 return -1;
 638         }
 639
 640         return 0;
 641 }
 642
 643 /* Inline functions to check the sanity of a pointer that is passed to us */
 644 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 645                                          const char *function)
 646 {
 647         if (!serial) {
 648                 dbg("%s - serial == NULL", function);
 649                 return -1;
 650         }
 651         if (!serial->type) {
 652                 dbg("%s - serial->type == NULL!", function);
 653                 return -1;
 654         }
 655
 656         return 0;
 657 }
 658
 659 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 660                                                  const char *function)
 661 {
 662         /* if no port was specified, or it fails a paranoia check */
 663         if (!port ||
 664             mos7840_port_paranoia_check(port, function) ||
 665             mos7840_serial_paranoia_check(port->serial, function)) {
 666                 /* then say that we don't have a valid usb_serial thing,
 667                  * which will end up genrating -ENODEV return values */
 668                 return NULL;
 669         }
 670
 671         return port->serial;
 672 }
 673
 674 /*****************************************************************************
 675  * mos7840_bulk_in_callback
 676  *      this is the callback function for when we have received data on the
 677  *      bulk in endpoint.
 678  *****************************************************************************/
 679
 680 static void mos7840_bulk_in_callback(struct urb *urb)
 681 {
 682         int retval;
 683         unsigned char *data;
 684         struct usb_serial *serial;
 685         struct usb_serial_port *port;
 686         struct moschip_port *mos7840_port;
 687         struct tty_struct *tty;
 688         int status = urb->status;
 689
 690         mos7840_port = urb->context;
 691         if (!mos7840_port) {
 692                 dbg("%s", "NULL mos7840_port pointer \n");
 693                 mos7840_port->read_urb_busy = false;
 694                 return;
 695         }
 696
 697         if (status) {
 698                 dbg("nonzero read bulk status received: %d", status);
 699                 mos7840_port->read_urb_busy = false;
 700                 return;
 701         }
 702
 703         port = (struct usb_serial_port *)mos7840_port->port;
 704         if (mos7840_port_paranoia_check(port, __func__)) {
 705                 dbg("%s", "Port Paranoia failed \n");
 706                 mos7840_port->read_urb_busy = false;
 707                 return;
 708         }
 709
 710         serial = mos7840_get_usb_serial(port, __func__);
 711         if (!serial) {
 712                 dbg("%s\n", "Bad serial pointer ");
 713                 mos7840_port->read_urb_busy = false;
 714                 return;
 715         }
 716
 717         dbg("%s\n", "Entering... \n");
 718
 719         data = urb->transfer_buffer;
 720
 721         dbg("%s", "Entering ........... \n");
 722
 723         if (urb->actual_length) {
 724                 tty = tty_port_tty_get(&mos7840_port->port->port);
 725                 if (tty) {
 726                         tty_buffer_request_room(tty, urb->actual_length);
 727                         tty_insert_flip_string(tty, data, urb->actual_length);
 728                         dbg(" %s \n", data);
 729                         tty_flip_buffer_push(tty);
 730                         tty_kref_put(tty);
 731                 }
 732                 mos7840_port->icount.rx += urb->actual_length;
 733                 smp_wmb();
 734                 dbg("mos7840_port->icount.rx is %d:\n",
 735                     mos7840_port->icount.rx);
 736         }
 737
 738         if (!mos7840_port->read_urb) {
 739                 dbg("%s", "URB KILLED !!!\n");
 740                 mos7840_port->read_urb_busy = false;
 741                 return;
 742         }
 743
 744
 745         mos7840_port->read_urb->dev = serial->dev;
 746
 747         mos7840_port->read_urb_busy = true;
 748         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 749
 750         if (retval) {
 751                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 752                 mos7840_port->read_urb_busy = false;
 753         }
 754 }
 755
 756 /*****************************************************************************
 757  * mos7840_bulk_out_data_callback
 758  *      this is the callback function for when we have finished sending
 759  *      serial data on the bulk out endpoint.
 760  *****************************************************************************/
 761
 762 static void mos7840_bulk_out_data_callback(struct urb *urb)
 763 {
 764         struct moschip_port *mos7840_port;
 765         struct tty_struct *tty;
 766         int status = urb->status;
 767         int i;
 768
 769         mos7840_port = urb->context;
 770         spin_lock(&mos7840_port->pool_lock);
 771         for (i = 0; i < NUM_URBS; i++) {
 772                 if (urb == mos7840_port->write_urb_pool[i]) {
 773                         mos7840_port->busy[i] = 0;
 774                         break;
 775                 }
 776         }
 777         spin_unlock(&mos7840_port->pool_lock);
 778
 779         if (status) {
 780                 dbg("nonzero write bulk status received:%d\n", status);
 781                 return;
 782         }
 783
 784         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 785                 dbg("%s", "Port Paranoia failed \n");
 786                 return;
 787         }
 788
 789         dbg("%s \n", "Entering .........");
 790
 791         tty = tty_port_tty_get(&mos7840_port->port->port);
 792         if (tty && mos7840_port->open)
 793                 tty_wakeup(tty);
 794         tty_kref_put(tty);
 795
 796 }
 797
 798 /************************************************************************/
 799 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 800 /************************************************************************/
 801 #ifdef MCSSerialProbe
 802 static int mos7840_serial_probe(struct usb_serial *serial,
 803                                 const struct usb_device_id *id)
 804 {
 805
 806         /*need to implement the mode_reg reading and updating\
 807            structures usb_serial_ device_type\
 808            (i.e num_ports, num_bulkin,bulkout etc) */
 809         /* Also we can update the changes  attach */
 810         return 1;
 811 }
 812 #endif
 813
 814 /*****************************************************************************
 815  * mos7840_open
 816  *      this function is called by the tty driver when a port is opened
 817  *      If successful, we return 0
 818  *      Otherwise we return a negative error number.
 819  *****************************************************************************/
 820
 821 static int mos7840_open(struct tty_struct *tty,
 822                         struct usb_serial_port *port, struct file *filp)
 823 {
 824         int response;
 825         int j;
 826         struct usb_serial *serial;
 827         struct urb *urb;
 828         __u16 Data;
 829         int status;
 830         struct moschip_port *mos7840_port;
 831         struct moschip_port *port0;
 832
 833         if (mos7840_port_paranoia_check(port, __func__)) {
 834                 dbg("%s", "Port Paranoia failed \n");
 835                 return -ENODEV;
 836         }
 837
 838         serial = port->serial;
 839
 840         if (mos7840_serial_paranoia_check(serial, __func__)) {
 841                 dbg("%s", "Serial Paranoia failed \n");
 842                 return -ENODEV;
 843         }
 844
 845         mos7840_port = mos7840_get_port_private(port);
 846         port0 = mos7840_get_port_private(serial->port[0]);
 847
 848         if (mos7840_port == NULL || port0 == NULL)
 849                 return -ENODEV;
 850
 851         usb_clear_halt(serial->dev, port->write_urb->pipe);
 852         usb_clear_halt(serial->dev, port->read_urb->pipe);
 853         port0->open_ports++;
 854
 855         /* Initialising the write urb pool */
 856         for (j = 0; j < NUM_URBS; ++j) {
 857                 urb = usb_alloc_urb(0, GFP_KERNEL);
 858                 mos7840_port->write_urb_pool[j] = urb;
 859
 860                 if (urb == NULL) {
 861                         dev_err(&port->dev, "No more urbs???\n");
 862                         continue;
 863                 }
 864
 865                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 866                                                                 GFP_KERNEL);
 867                 if (!urb->transfer_buffer) {
 868                         usb_free_urb(urb);
 869                         mos7840_port->write_urb_pool[j] = NULL;
 870                         dev_err(&port->dev,
 871                                 "%s-out of memory for urb buffers.\n",
 872                                 __func__);
 873                         continue;
 874                 }
 875         }
 876
 877 /*****************************************************************************
 878  * Initialize MCS7840 -- Write Init values to corresponding Registers
 879  *
 880  * Register Index
 881  * 1 : IER
 882  * 2 : FCR
 883  * 3 : LCR
 884  * 4 : MCR
 885  *
 886  * 0x08 : SP1/2 Control Reg
 887  *****************************************************************************/
 888
 889         /* NEED to check the following Block */
 890
 891         Data = 0x0;
 892         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 893         if (status < 0) {
 894                 dbg("Reading Spreg failed\n");
 895                 return -1;
 896         }
 897         Data |= 0x80;
 898         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 899         if (status < 0) {
 900                 dbg("writing Spreg failed\n");
 901                 return -1;
 902         }
 903
 904         Data &= ~0x80;
 905         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 906         if (status < 0) {
 907                 dbg("writing Spreg failed\n");
 908                 return -1;
 909         }
 910         /* End of block to be checked */
 911
 912         Data = 0x0;
 913         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 914                                                                         &Data);
 915         if (status < 0) {
 916                 dbg("Reading Controlreg failed\n");
 917                 return -1;
 918         }
 919         Data |= 0x08;           /* Driver done bit */
 920         Data |= 0x20;           /* rx_disable */
 921         status = mos7840_set_reg_sync(port,
 922                                 mos7840_port->ControlRegOffset, Data);
 923         if (status < 0) {
 924                 dbg("writing Controlreg failed\n");
 925                 return -1;
 926         }
 927         /* do register settings here */
 928         /* Set all regs to the device default values. */
 929         /***********************************
 930          * First Disable all interrupts.
 931          ***********************************/
 932         Data = 0x00;
 933         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 934         if (status < 0) {
 935                 dbg("disableing interrupts failed\n");
 936                 return -1;
 937         }
 938         /* Set FIFO_CONTROL_REGISTER to the default value */
 939         Data = 0x00;
 940         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 941         if (status < 0) {
 942                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 943                 return -1;
 944         }
 945
 946         Data = 0xcf;
 947         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 948         if (status < 0) {
 949                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 950                 return -1;
 951         }
 952
 953         Data = 0x03;
 954         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 955         mos7840_port->shadowLCR = Data;
 956
 957         Data = 0x0b;
 958         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 959         mos7840_port->shadowMCR = Data;
 960
 961         Data = 0x00;
 962         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 963         mos7840_port->shadowLCR = Data;
 964
 965         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 966         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 967
 968         Data = 0x0c;
 969         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 970
 971         Data = 0x0;
 972         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 973
 974         Data = 0x00;
 975         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 976
 977         Data = Data & ~SERIAL_LCR_DLAB;
 978         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 979         mos7840_port->shadowLCR = Data;
 980
 981         /* clearing Bulkin and Bulkout Fifo */
 982         Data = 0x0;
 983         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 984
 985         Data = Data | 0x0c;
 986         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 987
 988         Data = Data & ~0x0c;
 989         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 990         /* Finally enable all interrupts */
 991         Data = 0x0c;
 992         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 993
 994         /* clearing rx_disable */
 995         Data = 0x0;
 996         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 997                                                                         &Data);
 998         Data = Data & ~0x20;
 999         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1000                                                                         Data);
1001
1002         /* rx_negate */
1003         Data = 0x0;
1004         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1005                                                                         &Data);
1006         Data = Data | 0x10;
1007         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1008                                                                         Data);
1009
1010         /* force low_latency on so that our tty_push actually forces *
1011          * the data through,otherwise it is scheduled, and with      *
1012          * high data rates (like with OHCI) data can get lost.       */
1013         if (tty)
1014                 tty->low_latency = 1;
1015
1016         /* Check to see if we've set up our endpoint info yet    *
1017          * (can't set it up in mos7840_startup as the structures *
1018          * were not set up at that time.)                        */
1019         if (port0->open_ports == 1) {
1020                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1021                         /* set up interrupt urb */
1022                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1023                                 serial->dev,
1024                                 usb_rcvintpipe(serial->dev,
1025                                 serial->port[0]->interrupt_in_endpointAddress),
1026                                 serial->port[0]->interrupt_in_buffer,
1027                                 serial->port[0]->interrupt_in_urb->
1028                                 transfer_buffer_length,
1029                                 mos7840_interrupt_callback,
1030                                 serial,
1031                                 serial->port[0]->interrupt_in_urb->interval);
1032
1033                         /* start interrupt read for mos7840               *
1034                          * will continue as long as mos7840 is connected  */
1035
1036                         response =
1037                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1038                                            GFP_KERNEL);
1039                         if (response) {
1040                                 dev_err(&port->dev, "%s - Error %d submitting "
1041                                         "interrupt urb\n", __func__, response);
1042                         }
1043
1044                 }
1045
1046         }
1047
1048         /* see if we've set up our endpoint info yet   *
1049          * (can't set it up in mos7840_startup as the  *
1050          * structures were not set up at that time.)   */
1051
1052         dbg("port number is %d \n", port->number);
1053         dbg("serial number is %d \n", port->serial->minor);
1054         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1055         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1056         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1057         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1058         mos7840_port->read_urb = port->read_urb;
1059
1060         /* set up our bulk in urb */
1061
1062         usb_fill_bulk_urb(mos7840_port->read_urb,
1063                           serial->dev,
1064                           usb_rcvbulkpipe(serial->dev,
1065                                           port->bulk_in_endpointAddress),
1066                           port->bulk_in_buffer,
1067                           mos7840_port->read_urb->transfer_buffer_length,
1068                           mos7840_bulk_in_callback, mos7840_port);
1069
1070         dbg("mos7840_open: bulkin endpoint is %d\n",
1071             port->bulk_in_endpointAddress);
1072         mos7840_port->read_urb_busy = true;
1073         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1074         if (response) {
1075                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1076                         __func__, response);
1077                 mos7840_port->read_urb_busy = false;
1078         }
1079
1080         /* initialize our wait queues */
1081         init_waitqueue_head(&mos7840_port->wait_chase);
1082         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1083
1084         /* initialize our icount structure */
1085         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1086
1087         /* initialize our port settings */
1088         /* Must set to enable ints! */
1089         mos7840_port->shadowMCR = MCR_MASTER_IE;
1090         /* send a open port command */
1091         mos7840_port->open = 1;
1092         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1093         mos7840_port->icount.tx = 0;
1094         mos7840_port->icount.rx = 0;
1095
1096         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n",
1097                                 serial, mos7840_port, port);
1098
1099         return 0;
1100
1101 }
1102
1103 /*****************************************************************************
1104  * mos7840_chars_in_buffer
1105  *      this function is called by the tty driver when it wants to know how many
1106  *      bytes of data we currently have outstanding in the port (data that has
1107  *      been written, but hasn't made it out the port yet)
1108  *      If successful, we return the number of bytes left to be written in the
1109  *      system,
1110  *      Otherwise we return zero.
1111  *****************************************************************************/
1112
1113 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1114 {
1115         struct usb_serial_port *port = tty->driver_data;
1116         int i;
1117         int chars = 0;
1118         unsigned long flags;
1119         struct moschip_port *mos7840_port;
1120
1121         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1122
1123         if (mos7840_port_paranoia_check(port, __func__)) {
1124                 dbg("%s", "Invalid port \n");
1125                 return 0;
1126         }
1127
1128         mos7840_port = mos7840_get_port_private(port);
1129         if (mos7840_port == NULL) {
1130                 dbg("%s \n", "mos7840_break:leaving ...........");
1131                 return 0;
1132         }
1133
1134         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1135         for (i = 0; i < NUM_URBS; ++i)
1136                 if (mos7840_port->busy[i])
1137                         chars += URB_TRANSFER_BUFFER_SIZE;
1138         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1139         dbg("%s - returns %d", __func__, chars);
1140         return chars;
1141
1142 }
1143
1144 /************************************************************************
1145  *
1146  * mos7840_block_until_tx_empty
1147  *
1148  *      This function will block the close until one of the following:
1149  *              1. TX count are 0
1150  *              2. The mos7840 has stopped
1151  *              3. A timeout of 3 seconds without activity has expired
1152  *
1153  ************************************************************************/
1154 static void mos7840_block_until_tx_empty(struct tty_struct *tty,
1155                                 struct moschip_port *mos7840_port)
1156 {
1157         int timeout = HZ / 10;
1158         int wait = 30;
1159         int count;
1160
1161         while (1) {
1162
1163                 count = mos7840_chars_in_buffer(tty);
1164
1165                 /* Check for Buffer status */
1166                 if (count <= 0)
1167                         return;
1168
1169                 /* Block the thread for a while */
1170                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1171                                                timeout);
1172
1173                 /* No activity.. count down section */
1174                 wait--;
1175                 if (wait == 0) {
1176                         dbg("%s - TIMEOUT", __func__);
1177                         return;
1178                 } else {
1179                         /* Reset timeout value back to seconds */
1180                         wait = 30;
1181                 }
1182         }
1183 }
1184
1185 /*****************************************************************************
1186  * mos7840_close
1187  *      this function is called by the tty driver when a port is closed
1188  *****************************************************************************/
1189
1190 static void mos7840_close(struct tty_struct *tty,
1191                         struct usb_serial_port *port, struct file *filp)
1192 {
1193         struct usb_serial *serial;
1194         struct moschip_port *mos7840_port;
1195         struct moschip_port *port0;
1196         int j;
1197         __u16 Data;
1198
1199         dbg("%s\n", "mos7840_close:entering...");
1200
1201         if (mos7840_port_paranoia_check(port, __func__)) {
1202                 dbg("%s", "Port Paranoia failed \n");
1203                 return;
1204         }
1205
1206         serial = mos7840_get_usb_serial(port, __func__);
1207         if (!serial) {
1208                 dbg("%s", "Serial Paranoia failed \n");
1209                 return;
1210         }
1211
1212         mos7840_port = mos7840_get_port_private(port);
1213         port0 = mos7840_get_port_private(serial->port[0]);
1214
1215         if (mos7840_port == NULL || port0 == NULL)
1216                 return;
1217
1218         for (j = 0; j < NUM_URBS; ++j)
1219                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1220
1221         /* Freeing Write URBs */
1222         for (j = 0; j < NUM_URBS; ++j) {
1223                 if (mos7840_port->write_urb_pool[j]) {
1224                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1225                                 kfree(mos7840_port->write_urb_pool[j]->
1226                                       transfer_buffer);
1227
1228                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1229                 }
1230         }
1231
1232         if (serial->dev)
1233                 /* flush and block until tx is empty */
1234                 mos7840_block_until_tx_empty(tty, mos7840_port);
1235
1236         /* While closing port, shutdown all bulk read, write  *
1237          * and interrupt read if they exists                  */
1238         if (serial->dev) {
1239                 if (mos7840_port->write_urb) {
1240                         dbg("%s", "Shutdown bulk write\n");
1241                         usb_kill_urb(mos7840_port->write_urb);
1242                 }
1243                 if (mos7840_port->read_urb) {
1244                         dbg("%s", "Shutdown bulk read\n");
1245                         usb_kill_urb(mos7840_port->read_urb);
1246                         mos7840_port->read_urb_busy = false;
1247                 }
1248                 if ((&mos7840_port->control_urb)) {
1249                         dbg("%s", "Shutdown control read\n");
1250                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1251                 }
1252         }
1253 /*      if(mos7840_port->ctrl_buf != NULL) */
1254 /*              kfree(mos7840_port->ctrl_buf); */
1255         port0->open_ports--;
1256         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1257             port0->open_ports, port->number);
1258         if (port0->open_ports == 0) {
1259                 if (serial->port[0]->interrupt_in_urb) {
1260                         dbg("%s", "Shutdown interrupt_in_urb\n");
1261                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1262                 }
1263         }
1264
1265         if (mos7840_port->write_urb) {
1266                 /* if this urb had a transfer buffer already (old tx) free it */
1267                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1268                         kfree(mos7840_port->write_urb->transfer_buffer);
1269                 usb_free_urb(mos7840_port->write_urb);
1270         }
1271
1272         Data = 0x0;
1273         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1274
1275         Data = 0x00;
1276         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1277
1278         mos7840_port->open = 0;
1279
1280         dbg("%s \n", "Leaving ............");
1281 }
1282
1283 /************************************************************************
1284  *
1285  * mos7840_block_until_chase_response
1286  *
1287  *      This function will block the close until one of the following:
1288  *              1. Response to our Chase comes from mos7840
1289  *              2. A timeout of 10 seconds without activity has expired
1290  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1291  *
1292  ************************************************************************/
1293
1294 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1295                                         struct moschip_port *mos7840_port)
1296 {
1297         int timeout = 1 * HZ;
1298         int wait = 10;
1299         int count;
1300
1301         while (1) {
1302                 count = mos7840_chars_in_buffer(tty);
1303
1304                 /* Check for Buffer status */
1305                 if (count <= 0)
1306                         return;
1307
1308                 /* Block the thread for a while */
1309                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1310                                                timeout);
1311                 /* No activity.. count down section */
1312                 wait--;
1313                 if (wait == 0) {
1314                         dbg("%s - TIMEOUT", __func__);
1315                         return;
1316                 } else {
1317                         /* Reset timeout value back to seconds */
1318                         wait = 10;
1319                 }
1320         }
1321
1322 }
1323
1324 /*****************************************************************************
1325  * mos7840_break
1326  *      this function sends a break to the port
1327  *****************************************************************************/
1328 static void mos7840_break(struct tty_struct *tty, int break_state)
1329 {
1330         struct usb_serial_port *port = tty->driver_data;
1331         unsigned char data;
1332         struct usb_serial *serial;
1333         struct moschip_port *mos7840_port;
1334
1335         dbg("%s \n", "Entering ...........");
1336         dbg("mos7840_break: Start\n");
1337
1338         if (mos7840_port_paranoia_check(port, __func__)) {
1339                 dbg("%s", "Port Paranoia failed \n");
1340                 return;
1341         }
1342
1343         serial = mos7840_get_usb_serial(port, __func__);
1344         if (!serial) {
1345                 dbg("%s", "Serial Paranoia failed \n");
1346                 return;
1347         }
1348
1349         mos7840_port = mos7840_get_port_private(port);
1350
1351         if (mos7840_port == NULL)
1352                 return;
1353
1354         if (serial->dev)
1355                 /* flush and block until tx is empty */
1356                 mos7840_block_until_chase_response(tty, mos7840_port);
1357
1358         if (break_state == -1)
1359                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1360         else
1361                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1362
1363         /* FIXME: no locking on shadowLCR anywhere in driver */
1364         mos7840_port->shadowLCR = data;
1365         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1366             mos7840_port->shadowLCR);
1367         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1368                              mos7840_port->shadowLCR);
1369
1370         return;
1371 }
1372
1373 /*****************************************************************************
1374  * mos7840_write_room
1375  *      this function is called by the tty driver when it wants to know how many
1376  *      bytes of data we can accept for a specific port.
1377  *      If successful, we return the amount of room that we have for this port
1378  *      Otherwise we return a negative error number.
1379  *****************************************************************************/
1380
1381 static int mos7840_write_room(struct tty_struct *tty)
1382 {
1383         struct usb_serial_port *port = tty->driver_data;
1384         int i;
1385         int room = 0;
1386         unsigned long flags;
1387         struct moschip_port *mos7840_port;
1388
1389         dbg("%s \n", " mos7840_write_room:entering ...........");
1390
1391         if (mos7840_port_paranoia_check(port, __func__)) {
1392                 dbg("%s", "Invalid port \n");
1393                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1394                 return -1;
1395         }
1396
1397         mos7840_port = mos7840_get_port_private(port);
1398         if (mos7840_port == NULL) {
1399                 dbg("%s \n", "mos7840_break:leaving ...........");
1400                 return -1;
1401         }
1402
1403         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1404         for (i = 0; i < NUM_URBS; ++i) {
1405                 if (!mos7840_port->busy[i])
1406                         room += URB_TRANSFER_BUFFER_SIZE;
1407         }
1408         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1409
1410         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1411         dbg("%s - returns %d", __func__, room);
1412         return room;
1413
1414 }
1415
1416 /*****************************************************************************
1417  * mos7840_write
1418  *      this function is called by the tty driver when data should be written to
1419  *      the port.
1420  *      If successful, we return the number of bytes written, otherwise we
1421  *      return a negative error number.
1422  *****************************************************************************/
1423
1424 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1425                          const unsigned char *data, int count)
1426 {
1427         int status;
1428         int i;
1429         int bytes_sent = 0;
1430         int transfer_size;
1431         unsigned long flags;
1432
1433         struct moschip_port *mos7840_port;
1434         struct usb_serial *serial;
1435         struct urb *urb;
1436         /* __u16 Data; */
1437         const unsigned char *current_position = data;
1438         unsigned char *data1;
1439         dbg("%s \n", "entering ...........");
1440         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1441                                         mos7840_port->shadowLCR); */
1442
1443 #ifdef NOTMOS7840
1444         Data = 0x00;
1445         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1446         mos7840_port->shadowLCR = Data;
1447         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1448         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1449             mos7840_port->shadowLCR);
1450
1451         /* Data = 0x03; */
1452         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1453         /* mos7840_port->shadowLCR=Data;//Need to add later */
1454
1455         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1456         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1457
1458         /* Data = 0x0c; */
1459         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1460         Data = 0x00;
1461         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1462         dbg("mos7840_write:DLL value is %x\n", Data);
1463
1464         Data = 0x0;
1465         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1466         dbg("mos7840_write:DLM value is %x\n", Data);
1467
1468         Data = Data & ~SERIAL_LCR_DLAB;
1469         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1470             mos7840_port->shadowLCR);
1471         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1472 #endif
1473
1474         if (mos7840_port_paranoia_check(port, __func__)) {
1475                 dbg("%s", "Port Paranoia failed \n");
1476                 return -1;
1477         }
1478
1479         serial = port->serial;
1480         if (mos7840_serial_paranoia_check(serial, __func__)) {
1481                 dbg("%s", "Serial Paranoia failed \n");
1482                 return -1;
1483         }
1484
1485         mos7840_port = mos7840_get_port_private(port);
1486         if (mos7840_port == NULL) {
1487                 dbg("%s", "mos7840_port is NULL\n");
1488                 return -1;
1489         }
1490
1491         /* try to find a free urb in the list */
1492         urb = NULL;
1493
1494         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1495         for (i = 0; i < NUM_URBS; ++i) {
1496                 if (!mos7840_port->busy[i]) {
1497                         mos7840_port->busy[i] = 1;
1498                         urb = mos7840_port->write_urb_pool[i];
1499                         dbg("\nURB:%d", i);
1500                         break;
1501                 }
1502         }
1503         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1504
1505         if (urb == NULL) {
1506                 dbg("%s - no more free urbs", __func__);
1507                 goto exit;
1508         }
1509
1510         if (urb->transfer_buffer == NULL) {
1511                 urb->transfer_buffer =
1512                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1513
1514                 if (urb->transfer_buffer == NULL) {
1515                         dev_err(&port->dev, "%s no more kernel memory...\n",
1516                                 __func__);
1517                         goto exit;
1518                 }
1519         }
1520         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1521
1522         memcpy(urb->transfer_buffer, current_position, transfer_size);
1523
1524         /* fill urb with data and submit  */
1525         usb_fill_bulk_urb(urb,
1526                           serial->dev,
1527                           usb_sndbulkpipe(serial->dev,
1528                                           port->bulk_out_endpointAddress),
1529                           urb->transfer_buffer,
1530                           transfer_size,
1531                           mos7840_bulk_out_data_callback, mos7840_port);
1532
1533         data1 = urb->transfer_buffer;
1534         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1535
1536         /* send it down the pipe */
1537         status = usb_submit_urb(urb, GFP_ATOMIC);
1538
1539         if (status) {
1540                 mos7840_port->busy[i] = 0;
1541                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1542                         "with status = %d\n", __func__, status);
1543                 bytes_sent = status;
1544                 goto exit;
1545         }
1546         bytes_sent = transfer_size;
1547         mos7840_port->icount.tx += transfer_size;
1548         smp_wmb();
1549         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1550 exit:
1551         return bytes_sent;
1552
1553 }
1554
1555 /*****************************************************************************
1556  * mos7840_throttle
1557  *      this function is called by the tty driver when it wants to stop the data
1558  *      being read from the port.
1559  *****************************************************************************/
1560
1561 static void mos7840_throttle(struct tty_struct *tty)
1562 {
1563         struct usb_serial_port *port = tty->driver_data;
1564         struct moschip_port *mos7840_port;
1565         int status;
1566
1567         if (mos7840_port_paranoia_check(port, __func__)) {
1568                 dbg("%s", "Invalid port \n");
1569                 return;
1570         }
1571
1572         dbg("- port %d\n", port->number);
1573
1574         mos7840_port = mos7840_get_port_private(port);
1575
1576         if (mos7840_port == NULL)
1577                 return;
1578
1579         if (!mos7840_port->open) {
1580                 dbg("%s\n", "port not opened");
1581                 return;
1582         }
1583
1584         dbg("%s", "Entering .......... \n");
1585
1586         /* if we are implementing XON/XOFF, send the stop character */
1587         if (I_IXOFF(tty)) {
1588                 unsigned char stop_char = STOP_CHAR(tty);
1589                 status = mos7840_write(tty, port, &stop_char, 1);
1590                 if (status <= 0)
1591                         return;
1592         }
1593         /* if we are implementing RTS/CTS, toggle that line */
1594         if (tty->termios->c_cflag & CRTSCTS) {
1595                 mos7840_port->shadowMCR &= ~MCR_RTS;
1596                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1597                                          mos7840_port->shadowMCR);
1598                 if (status < 0)
1599                         return;
1600         }
1601
1602         return;
1603 }
1604
1605 /*****************************************************************************
1606  * mos7840_unthrottle
1607  *      this function is called by the tty driver when it wants to resume
1608  *      the data being read from the port (called after mos7840_throttle is
1609  *      called)
1610  *****************************************************************************/
1611 static void mos7840_unthrottle(struct tty_struct *tty)
1612 {
1613         struct usb_serial_port *port = tty->driver_data;
1614         int status;
1615         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1616
1617         if (mos7840_port_paranoia_check(port, __func__)) {
1618                 dbg("%s", "Invalid port \n");
1619                 return;
1620         }
1621
1622         if (mos7840_port == NULL)
1623                 return;
1624
1625         if (!mos7840_port->open) {
1626                 dbg("%s - port not opened", __func__);
1627                 return;
1628         }
1629
1630         dbg("%s", "Entering .......... \n");
1631
1632         /* if we are implementing XON/XOFF, send the start character */
1633         if (I_IXOFF(tty)) {
1634                 unsigned char start_char = START_CHAR(tty);
1635                 status = mos7840_write(tty, port, &start_char, 1);
1636                 if (status <= 0)
1637                         return;
1638         }
1639
1640         /* if we are implementing RTS/CTS, toggle that line */
1641         if (tty->termios->c_cflag & CRTSCTS) {
1642                 mos7840_port->shadowMCR |= MCR_RTS;
1643                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1644                                          mos7840_port->shadowMCR);
1645                 if (status < 0)
1646                         return;
1647         }
1648 }
1649
1650 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1651 {
1652         struct usb_serial_port *port = tty->driver_data;
1653         struct moschip_port *mos7840_port;
1654         unsigned int result;
1655         __u16 msr;
1656         __u16 mcr;
1657         int status;
1658         mos7840_port = mos7840_get_port_private(port);
1659
1660         dbg("%s - port %d", __func__, port->number);
1661
1662         if (mos7840_port == NULL)
1663                 return -ENODEV;
1664
1665         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1666         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1667         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1668             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1669             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1670             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1671             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1672             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1673             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1674
1675         dbg("%s - 0x%04X", __func__, result);
1676
1677         return result;
1678 }
1679
1680 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1681                             unsigned int set, unsigned int clear)
1682 {
1683         struct usb_serial_port *port = tty->driver_data;
1684         struct moschip_port *mos7840_port;
1685         unsigned int mcr;
1686         int status;
1687
1688         dbg("%s - port %d", __func__, port->number);
1689
1690         mos7840_port = mos7840_get_port_private(port);
1691
1692         if (mos7840_port == NULL)
1693                 return -ENODEV;
1694
1695         /* FIXME: What locks the port registers ? */
1696         mcr = mos7840_port->shadowMCR;
1697         if (clear & TIOCM_RTS)
1698                 mcr &= ~MCR_RTS;
1699         if (clear & TIOCM_DTR)
1700                 mcr &= ~MCR_DTR;
1701         if (clear & TIOCM_LOOP)
1702                 mcr &= ~MCR_LOOPBACK;
1703
1704         if (set & TIOCM_RTS)
1705                 mcr |= MCR_RTS;
1706         if (set & TIOCM_DTR)
1707                 mcr |= MCR_DTR;
1708         if (set & TIOCM_LOOP)
1709                 mcr |= MCR_LOOPBACK;
1710
1711         mos7840_port->shadowMCR = mcr;
1712
1713         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1714         if (status < 0) {
1715                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1716                 return status;
1717         }
1718
1719         return 0;
1720 }
1721
1722 /*****************************************************************************
1723  * mos7840_calc_baud_rate_divisor
1724  *      this function calculates the proper baud rate divisor for the specified
1725  *      baud rate.
1726  *****************************************************************************/
1727 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1728                                           __u16 *clk_sel_val)
1729 {
1730
1731         dbg("%s - %d", __func__, baudRate);
1732
1733         if (baudRate <= 115200) {
1734                 *divisor = 115200 / baudRate;
1735                 *clk_sel_val = 0x0;
1736         }
1737         if ((baudRate > 115200) && (baudRate <= 230400)) {
1738                 *divisor = 230400 / baudRate;
1739                 *clk_sel_val = 0x10;
1740         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1741                 *divisor = 403200 / baudRate;
1742                 *clk_sel_val = 0x20;
1743         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1744                 *divisor = 460800 / baudRate;
1745                 *clk_sel_val = 0x30;
1746         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1747                 *divisor = 806400 / baudRate;
1748                 *clk_sel_val = 0x40;
1749         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1750                 *divisor = 921600 / baudRate;
1751                 *clk_sel_val = 0x50;
1752         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1753                 *divisor = 1572864 / baudRate;
1754                 *clk_sel_val = 0x60;
1755         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1756                 *divisor = 3145728 / baudRate;
1757                 *clk_sel_val = 0x70;
1758         }
1759         return 0;
1760
1761 #ifdef NOTMCS7840
1762
1763         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1764                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1765                         *divisor = mos7840_divisor_table[i].Divisor;
1766                         return 0;
1767                 }
1768         }
1769
1770         /* After trying for all the standard baud rates    *
1771          * Try calculating the divisor for this baud rate  */
1772
1773         if (baudrate > 75 && baudrate < 230400) {
1774                 /* get the divisor */
1775                 custom = (__u16) (230400L / baudrate);
1776
1777                 /* Check for round off */
1778                 round1 = (__u16) (2304000L / baudrate);
1779                 round = (__u16) (round1 - (custom * 10));
1780                 if (round > 4)
1781                         custom++;
1782                 *divisor = custom;
1783
1784                 dbg(" Baud %d = %d\n", baudrate, custom);
1785                 return 0;
1786         }
1787
1788         dbg("%s\n", " Baud calculation Failed...");
1789         return -1;
1790 #endif
1791 }
1792
1793 /*****************************************************************************
1794  * mos7840_send_cmd_write_baud_rate
1795  *      this function sends the proper command to change the baud rate of the
1796  *      specified port.
1797  *****************************************************************************/
1798
1799 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1800                                             int baudRate)
1801 {
1802         int divisor = 0;
1803         int status;
1804         __u16 Data;
1805         unsigned char number;
1806         __u16 clk_sel_val;
1807         struct usb_serial_port *port;
1808
1809         if (mos7840_port == NULL)
1810                 return -1;
1811
1812         port = (struct usb_serial_port *)mos7840_port->port;
1813         if (mos7840_port_paranoia_check(port, __func__)) {
1814                 dbg("%s", "Invalid port \n");
1815                 return -1;
1816         }
1817
1818         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1819                 dbg("%s", "Invalid Serial \n");
1820                 return -1;
1821         }
1822
1823         dbg("%s", "Entering .......... \n");
1824
1825         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1826
1827         dbg("%s - port = %d, baud = %d", __func__,
1828             mos7840_port->port->number, baudRate);
1829         /* reset clk_uart_sel in spregOffset */
1830         if (baudRate > 115200) {
1831 #ifdef HW_flow_control
1832                 /* NOTE: need to see the pther register to modify */
1833                 /* setting h/w flow control bit to 1 */
1834                 Data = 0x2b;
1835                 mos7840_port->shadowMCR = Data;
1836                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1837                                                                         Data);
1838                 if (status < 0) {
1839                         dbg("Writing spreg failed in set_serial_baud\n");
1840                         return -1;
1841                 }
1842 #endif
1843
1844         } else {
1845 #ifdef HW_flow_control
1846                 / *setting h/w flow control bit to 0 */
1847                 Data = 0xb;
1848                 mos7840_port->shadowMCR = Data;
1849                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1850                                                                         Data);
1851                 if (status < 0) {
1852                         dbg("Writing spreg failed in set_serial_baud\n");
1853                         return -1;
1854                 }
1855 #endif
1856
1857         }
1858
1859         if (1) {                /* baudRate <= 115200) */
1860                 clk_sel_val = 0x0;
1861                 Data = 0x0;
1862                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1863                                                    &clk_sel_val);
1864                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1865                                                                  &Data);
1866                 if (status < 0) {
1867                         dbg("reading spreg failed in set_serial_baud\n");
1868                         return -1;
1869                 }
1870                 Data = (Data & 0x8f) | clk_sel_val;
1871                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1872                                                                 Data);
1873                 if (status < 0) {
1874                         dbg("Writing spreg failed in set_serial_baud\n");
1875                         return -1;
1876                 }
1877                 /* Calculate the Divisor */
1878
1879                 if (status) {
1880                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1881                         return status;
1882                 }
1883                 /* Enable access to divisor latch */
1884                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1885                 mos7840_port->shadowLCR = Data;
1886                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1887
1888                 /* Write the divisor */
1889                 Data = (unsigned char)(divisor & 0xff);
1890                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1891                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1892
1893                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1894                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1895                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1896
1897                 /* Disable access to divisor latch */
1898                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1899                 mos7840_port->shadowLCR = Data;
1900                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1901
1902         }
1903         return status;
1904 }
1905
1906 /*****************************************************************************
1907  * mos7840_change_port_settings
1908  *      This routine is called to set the UART on the device to match
1909  *      the specified new settings.
1910  *****************************************************************************/
1911
1912 static void mos7840_change_port_settings(struct tty_struct *tty,
1913         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1914 {
1915         int baud;
1916         unsigned cflag;
1917         unsigned iflag;
1918         __u8 lData;
1919         __u8 lParity;
1920         __u8 lStop;
1921         int status;
1922         __u16 Data;
1923         struct usb_serial_port *port;
1924         struct usb_serial *serial;
1925
1926         if (mos7840_port == NULL)
1927                 return;
1928
1929         port = (struct usb_serial_port *)mos7840_port->port;
1930
1931         if (mos7840_port_paranoia_check(port, __func__)) {
1932                 dbg("%s", "Invalid port \n");
1933                 return;
1934         }
1935
1936         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1937                 dbg("%s", "Invalid Serial \n");
1938                 return;
1939         }
1940
1941         serial = port->serial;
1942
1943         dbg("%s - port %d", __func__, mos7840_port->port->number);
1944
1945         if (!mos7840_port->open) {
1946                 dbg("%s - port not opened", __func__);
1947                 return;
1948         }
1949
1950         dbg("%s", "Entering .......... \n");
1951
1952         lData = LCR_BITS_8;
1953         lStop = LCR_STOP_1;
1954         lParity = LCR_PAR_NONE;
1955
1956         cflag = tty->termios->c_cflag;
1957         iflag = tty->termios->c_iflag;
1958
1959         /* Change the number of bits */
1960         if (cflag & CSIZE) {
1961                 switch (cflag & CSIZE) {
1962                 case CS5:
1963                         lData = LCR_BITS_5;
1964                         break;
1965
1966                 case CS6:
1967                         lData = LCR_BITS_6;
1968                         break;
1969
1970                 case CS7:
1971                         lData = LCR_BITS_7;
1972                         break;
1973                 default:
1974                 case CS8:
1975                         lData = LCR_BITS_8;
1976                         break;
1977                 }
1978         }
1979         /* Change the Parity bit */
1980         if (cflag & PARENB) {
1981                 if (cflag & PARODD) {
1982                         lParity = LCR_PAR_ODD;
1983                         dbg("%s - parity = odd", __func__);
1984                 } else {
1985                         lParity = LCR_PAR_EVEN;
1986                         dbg("%s - parity = even", __func__);
1987                 }
1988
1989         } else {
1990                 dbg("%s - parity = none", __func__);
1991         }
1992
1993         if (cflag & CMSPAR)
1994                 lParity = lParity | 0x20;
1995
1996         /* Change the Stop bit */
1997         if (cflag & CSTOPB) {
1998                 lStop = LCR_STOP_2;
1999                 dbg("%s - stop bits = 2", __func__);
2000         } else {
2001                 lStop = LCR_STOP_1;
2002                 dbg("%s - stop bits = 1", __func__);
2003         }
2004
2005         /* Update the LCR with the correct value */
2006         mos7840_port->shadowLCR &=
2007             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2008         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2009
2010         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2011             mos7840_port->shadowLCR);
2012         /* Disable Interrupts */
2013         Data = 0x00;
2014         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2015
2016         Data = 0x00;
2017         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2018
2019         Data = 0xcf;
2020         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2021
2022         /* Send the updated LCR value to the mos7840 */
2023         Data = mos7840_port->shadowLCR;
2024
2025         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2026
2027         Data = 0x00b;
2028         mos7840_port->shadowMCR = Data;
2029         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2030         Data = 0x00b;
2031         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2032
2033         /* set up the MCR register and send it to the mos7840 */
2034
2035         mos7840_port->shadowMCR = MCR_MASTER_IE;
2036         if (cflag & CBAUD)
2037                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2038
2039         if (cflag & CRTSCTS)
2040                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2041         else
2042                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2043
2044         Data = mos7840_port->shadowMCR;
2045         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2046
2047         /* Determine divisor based on baud rate */
2048         baud = tty_get_baud_rate(tty);
2049
2050         if (!baud) {
2051                 /* pick a default, any default... */
2052                 dbg("%s\n", "Picked default baud...");
2053                 baud = 9600;
2054         }
2055
2056         dbg("%s - baud rate = %d", __func__, baud);
2057         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2058
2059         /* Enable Interrupts */
2060         Data = 0x0c;
2061         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2062
2063         if (mos7840_port->read_urb_busy == false) {
2064                 mos7840_port->read_urb->dev = serial->dev;
2065                 mos7840_port->read_urb_busy = true;
2066                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2067                 if (status) {
2068                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2069                             status);
2070                         mos7840_port->read_urb_busy = false;
2071                 }
2072         }
2073         wake_up(&mos7840_port->delta_msr_wait);
2074         mos7840_port->delta_msr_cond = 1;
2075         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2076             mos7840_port->shadowLCR);
2077
2078         return;
2079 }
2080
2081 /*****************************************************************************
2082  * mos7840_set_termios
2083  *      this function is called by the tty driver when it wants to change
2084  *      the termios structure
2085  *****************************************************************************/
2086
2087 static void mos7840_set_termios(struct tty_struct *tty,
2088                                 struct usb_serial_port *port,
2089                                 struct ktermios *old_termios)
2090 {
2091         int status;
2092         unsigned int cflag;
2093         struct usb_serial *serial;
2094         struct moschip_port *mos7840_port;
2095         dbg("mos7840_set_termios: START\n");
2096         if (mos7840_port_paranoia_check(port, __func__)) {
2097                 dbg("%s", "Invalid port \n");
2098                 return;
2099         }
2100
2101         serial = port->serial;
2102
2103         if (mos7840_serial_paranoia_check(serial, __func__)) {
2104                 dbg("%s", "Invalid Serial \n");
2105                 return;
2106         }
2107
2108         mos7840_port = mos7840_get_port_private(port);
2109
2110         if (mos7840_port == NULL)
2111                 return;
2112
2113         if (!mos7840_port->open) {
2114                 dbg("%s - port not opened", __func__);
2115                 return;
2116         }
2117
2118         dbg("%s\n", "setting termios - ");
2119
2120         cflag = tty->termios->c_cflag;
2121
2122         dbg("%s - clfag %08x iflag %08x", __func__,
2123             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2124         dbg("%s - old clfag %08x old iflag %08x", __func__,
2125             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2126         dbg("%s - port %d", __func__, port->number);
2127
2128         /* change the port settings to the new ones specified */
2129
2130         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2131
2132         if (!mos7840_port->read_urb) {
2133                 dbg("%s", "URB KILLED !!!!!\n");
2134                 return;
2135         }
2136
2137         if (mos7840_port->read_urb_busy == false) {
2138                 mos7840_port->read_urb->dev = serial->dev;
2139                 mos7840_port->read_urb_busy = true;
2140                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2141                 if (status) {
2142                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2143                             status);
2144                         mos7840_port->read_urb_busy = false;
2145                 }
2146         }
2147         return;
2148 }
2149
2150 /*****************************************************************************
2151  * mos7840_get_lsr_info - get line status register info
2152  *
2153  * Purpose: Let user call ioctl() to get info when the UART physically
2154  *          is emptied.  On bus types like RS485, the transmitter must
2155  *          release the bus after transmitting. This must be done when
2156  *          the transmit shift register is empty, not be done when the
2157  *          transmit holding register is empty.  This functionality
2158  *          allows an RS485 driver to be written in user space.
2159  *****************************************************************************/
2160
2161 static int mos7840_get_lsr_info(struct tty_struct *tty,
2162                                 unsigned int __user *value)
2163 {
2164         int count;
2165         unsigned int result = 0;
2166
2167         count = mos7840_chars_in_buffer(tty);
2168         if (count == 0) {
2169                 dbg("%s -- Empty", __func__);
2170                 result = TIOCSER_TEMT;
2171         }
2172
2173         if (copy_to_user(value, &result, sizeof(int)))
2174                 return -EFAULT;
2175         return 0;
2176 }
2177
2178 /*****************************************************************************
2179  * mos7840_set_modem_info
2180  *      function to set modem info
2181  *****************************************************************************/
2182
2183 /* FIXME: Should be using the model control hooks */
2184
2185 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2186                                   unsigned int cmd, unsigned int __user *value)
2187 {
2188         unsigned int mcr;
2189         unsigned int arg;
2190         __u16 Data;
2191         int status;
2192         struct usb_serial_port *port;
2193
2194         if (mos7840_port == NULL)
2195                 return -1;
2196
2197         port = (struct usb_serial_port *)mos7840_port->port;
2198         if (mos7840_port_paranoia_check(port, __func__)) {
2199                 dbg("%s", "Invalid port \n");
2200                 return -1;
2201         }
2202
2203         mcr = mos7840_port->shadowMCR;
2204
2205         if (copy_from_user(&arg, value, sizeof(int)))
2206                 return -EFAULT;
2207
2208         switch (cmd) {
2209         case TIOCMBIS:
2210                 if (arg & TIOCM_RTS)
2211                         mcr |= MCR_RTS;
2212                 if (arg & TIOCM_DTR)
2213                         mcr |= MCR_RTS;
2214                 if (arg & TIOCM_LOOP)
2215                         mcr |= MCR_LOOPBACK;
2216                 break;
2217
2218         case TIOCMBIC:
2219                 if (arg & TIOCM_RTS)
2220                         mcr &= ~MCR_RTS;
2221                 if (arg & TIOCM_DTR)
2222                         mcr &= ~MCR_RTS;
2223                 if (arg & TIOCM_LOOP)
2224                         mcr &= ~MCR_LOOPBACK;
2225                 break;
2226
2227         case TIOCMSET:
2228                 /* turn off the RTS and DTR and LOOPBACK
2229                  * and then only turn on what was asked to */
2230                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2231                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2232                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2233                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2234                 break;
2235         }
2236
2237         lock_kernel();
2238         mos7840_port->shadowMCR = mcr;
2239
2240         Data = mos7840_port->shadowMCR;
2241         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2242         unlock_kernel();
2243         if (status < 0) {
2244                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2245                 return -1;
2246         }
2247
2248         return 0;
2249 }
2250
2251 /*****************************************************************************
2252  * mos7840_get_modem_info
2253  *      function to get modem info
2254  *****************************************************************************/
2255
2256 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2257                                   unsigned int __user *value)
2258 {
2259         unsigned int result = 0;
2260         __u16 msr;
2261         unsigned int mcr = mos7840_port->shadowMCR;
2262         mos7840_get_uart_reg(mos7840_port->port,
2263                                                 MODEM_STATUS_REGISTER, &msr);
2264         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2265             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2266             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2267             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2268             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2269             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2270
2271         dbg("%s -- %x", __func__, result);
2272
2273         if (copy_to_user(value, &result, sizeof(int)))
2274                 return -EFAULT;
2275         return 0;
2276 }
2277
2278 /*****************************************************************************
2279  * mos7840_get_serial_info
2280  *      function to get information about serial port
2281  *****************************************************************************/
2282
2283 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2284                                    struct serial_struct __user *retinfo)
2285 {
2286         struct serial_struct tmp;
2287
2288         if (mos7840_port == NULL)
2289                 return -1;
2290
2291         if (!retinfo)
2292                 return -EFAULT;
2293
2294         memset(&tmp, 0, sizeof(tmp));
2295
2296         tmp.type = PORT_16550A;
2297         tmp.line = mos7840_port->port->serial->minor;
2298         tmp.port = mos7840_port->port->number;
2299         tmp.irq = 0;
2300         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2301         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2302         tmp.baud_base = 9600;
2303         tmp.close_delay = 5 * HZ;
2304         tmp.closing_wait = 30 * HZ;
2305
2306         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2307                 return -EFAULT;
2308         return 0;
2309 }
2310
2311 /*****************************************************************************
2312  * SerialIoctl
2313  *      this function handles any ioctl calls to the driver
2314  *****************************************************************************/
2315
2316 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2317                          unsigned int cmd, unsigned long arg)
2318 {
2319         struct usb_serial_port *port = tty->driver_data;
2320         void __user *argp = (void __user *)arg;
2321         struct moschip_port *mos7840_port;
2322
2323         struct async_icount cnow;
2324         struct async_icount cprev;
2325         struct serial_icounter_struct icount;
2326         int mosret = 0;
2327
2328         if (mos7840_port_paranoia_check(port, __func__)) {
2329                 dbg("%s", "Invalid port \n");
2330                 return -1;
2331         }
2332
2333         mos7840_port = mos7840_get_port_private(port);
2334
2335         if (mos7840_port == NULL)
2336                 return -1;
2337
2338         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2339
2340         switch (cmd) {
2341                 /* return number of bytes available */
2342
2343         case TIOCSERGETLSR:
2344                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2345                 return mos7840_get_lsr_info(tty, argp);
2346                 return 0;
2347
2348         /* FIXME: use the modem hooks and remove this */
2349         case TIOCMBIS:
2350         case TIOCMBIC:
2351         case TIOCMSET:
2352                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2353                     port->number);
2354                 mosret =
2355                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2356                 return mosret;
2357
2358         case TIOCMGET:
2359                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2360                 return mos7840_get_modem_info(mos7840_port, argp);
2361
2362         case TIOCGSERIAL:
2363                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2364                 return mos7840_get_serial_info(mos7840_port, argp);
2365
2366         case TIOCSSERIAL:
2367                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2368                 break;
2369
2370         case TIOCMIWAIT:
2371                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2372                 cprev = mos7840_port->icount;
2373                 while (1) {
2374                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2375                         mos7840_port->delta_msr_cond = 0;
2376                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2377                                                  (mos7840_port->
2378                                                   delta_msr_cond == 1));
2379
2380                         /* see if a signal did it */
2381                         if (signal_pending(current))
2382                                 return -ERESTARTSYS;
2383                         cnow = mos7840_port->icount;
2384                         smp_rmb();
2385                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2386                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2387                                 return -EIO;    /* no change => error */
2388                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2389                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2390                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2391                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2392                                 return 0;
2393                         }
2394                         cprev = cnow;
2395                 }
2396                 /* NOTREACHED */
2397                 break;
2398
2399         case TIOCGICOUNT:
2400                 cnow = mos7840_port->icount;
2401                 smp_rmb();
2402                 icount.cts = cnow.cts;
2403                 icount.dsr = cnow.dsr;
2404                 icount.rng = cnow.rng;
2405                 icount.dcd = cnow.dcd;
2406                 icount.rx = cnow.rx;
2407                 icount.tx = cnow.tx;
2408                 icount.frame = cnow.frame;
2409                 icount.overrun = cnow.overrun;
2410                 icount.parity = cnow.parity;
2411                 icount.brk = cnow.brk;
2412                 icount.buf_overrun = cnow.buf_overrun;
2413
2414                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2415                     port->number, icount.rx, icount.tx);
2416                 if (copy_to_user(argp, &icount, sizeof(icount)))
2417                         return -EFAULT;
2418                 return 0;
2419         default:
2420                 break;
2421         }
2422         return -ENOIOCTLCMD;
2423 }
2424
2425 static int mos7840_calc_num_ports(struct usb_serial *serial)
2426 {
2427         int mos7840_num_ports = 0;
2428
2429         dbg("numberofendpoints: %d \n",
2430             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2431         dbg("numberofendpoints: %d \n",
2432             (int)serial->interface->altsetting->desc.bNumEndpoints);
2433         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2434                 mos7840_num_ports = serial->num_ports = 2;
2435         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2436                 serial->num_bulk_in = 4;
2437                 serial->num_bulk_out = 4;
2438                 mos7840_num_ports = serial->num_ports = 4;
2439         }
2440
2441         return mos7840_num_ports;
2442 }
2443
2444 /****************************************************************************
2445  * mos7840_startup
2446  ****************************************************************************/
2447
2448 static int mos7840_startup(struct usb_serial *serial)
2449 {
2450         struct moschip_port *mos7840_port;
2451         struct usb_device *dev;
2452         int i, status;
2453
2454         __u16 Data;
2455         dbg("%s \n", " mos7840_startup :entering..........");
2456
2457         if (!serial) {
2458                 dbg("%s\n", "Invalid Handler");
2459                 return -1;
2460         }
2461
2462         dev = serial->dev;
2463
2464         dbg("%s\n", "Entering...");
2465
2466         /* we set up the pointers to the endpoints in the mos7840_open *
2467          * function, as the structures aren't created yet.             */
2468
2469         /* set up port private structures */
2470         for (i = 0; i < serial->num_ports; ++i) {
2471                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2472                 if (mos7840_port == NULL) {
2473                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2474                         status = -ENOMEM;
2475                         i--; /* don't follow NULL pointer cleaning up */
2476                         goto error;
2477                 }
2478
2479                 /* Initialize all port interrupt end point to port 0 int
2480                  * endpoint. Our device has only one interrupt end point
2481                  * common to all port */
2482
2483                 mos7840_port->port = serial->port[i];
2484                 mos7840_set_port_private(serial->port[i], mos7840_port);
2485                 spin_lock_init(&mos7840_port->pool_lock);
2486
2487                 /* minor is not initialised until later by
2488                  * usb-serial.c:get_free_serial() and cannot therefore be used
2489                  * to index device instances */
2490                 mos7840_port->port_num = i + 1;
2491                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2492                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2493                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2494                 dbg ("serial->minor = %d", serial->minor);
2495
2496                 if (mos7840_port->port_num == 1) {
2497                         mos7840_port->SpRegOffset = 0x0;
2498                         mos7840_port->ControlRegOffset = 0x1;
2499                         mos7840_port->DcrRegOffset = 0x4;
2500                 } else if ((mos7840_port->port_num == 2)
2501                            && (serial->num_ports == 4)) {
2502                         mos7840_port->SpRegOffset = 0x8;
2503                         mos7840_port->ControlRegOffset = 0x9;
2504                         mos7840_port->DcrRegOffset = 0x16;
2505                 } else if ((mos7840_port->port_num == 2)
2506                            && (serial->num_ports == 2)) {
2507                         mos7840_port->SpRegOffset = 0xa;
2508                         mos7840_port->ControlRegOffset = 0xb;
2509                         mos7840_port->DcrRegOffset = 0x19;
2510                 } else if ((mos7840_port->port_num == 3)
2511                            && (serial->num_ports == 4)) {
2512                         mos7840_port->SpRegOffset = 0xa;
2513                         mos7840_port->ControlRegOffset = 0xb;
2514                         mos7840_port->DcrRegOffset = 0x19;
2515                 } else if ((mos7840_port->port_num == 4)
2516                            && (serial->num_ports == 4)) {
2517                         mos7840_port->SpRegOffset = 0xc;
2518                         mos7840_port->ControlRegOffset = 0xd;
2519                         mos7840_port->DcrRegOffset = 0x1c;
2520                 }
2521                 mos7840_dump_serial_port(mos7840_port);
2522                 mos7840_set_port_private(serial->port[i], mos7840_port);
2523
2524                 /* enable rx_disable bit in control register */
2525                 status = mos7840_get_reg_sync(serial->port[i],
2526                                  mos7840_port->ControlRegOffset, &Data);
2527                 if (status < 0) {
2528                         dbg("Reading ControlReg failed status-0x%x\n", status);
2529                         break;
2530                 } else
2531                         dbg("ControlReg Reading success val is %x, status%d\n",
2532                             Data, status);
2533                 Data |= 0x08;   /* setting driver done bit */
2534                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2535                                    modem status reg */
2536
2537                 /* Data |= 0x20; //rx_disable bit */
2538                 status = mos7840_set_reg_sync(serial->port[i],
2539                                          mos7840_port->ControlRegOffset, Data);
2540                 if (status < 0) {
2541                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2542                         break;
2543                 } else
2544                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2545                             status);
2546
2547                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2548                    and 0x24 in DCR3 */
2549                 Data = 0x01;
2550                 status = mos7840_set_reg_sync(serial->port[i],
2551                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2552                 if (status < 0) {
2553                         dbg("Writing DCR0 failed status-0x%x\n", status);
2554                         break;
2555                 } else
2556                         dbg("DCR0 Writing success status%d\n", status);
2557
2558                 Data = 0x05;
2559                 status = mos7840_set_reg_sync(serial->port[i],
2560                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2561                 if (status < 0) {
2562                         dbg("Writing DCR1 failed status-0x%x\n", status);
2563                         break;
2564                 } else
2565                         dbg("DCR1 Writing success status%d\n", status);
2566
2567                 Data = 0x24;
2568                 status = mos7840_set_reg_sync(serial->port[i],
2569                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2570                 if (status < 0) {
2571                         dbg("Writing DCR2 failed status-0x%x\n", status);
2572                         break;
2573                 } else
2574                         dbg("DCR2 Writing success status%d\n", status);
2575
2576                 /* write values in clkstart0x0 and clkmulti 0x20 */
2577                 Data = 0x0;
2578                 status = mos7840_set_reg_sync(serial->port[i],
2579                                          CLK_START_VALUE_REGISTER, Data);
2580                 if (status < 0) {
2581                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2582                         break;
2583                 } else
2584                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2585
2586                 Data = 0x20;
2587                 status = mos7840_set_reg_sync(serial->port[i],
2588                                         CLK_MULTI_REGISTER, Data);
2589                 if (status < 0) {
2590                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2591                             status);
2592                         goto error;
2593                 } else
2594                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2595                             status);
2596
2597                 /* write value 0x0 to scratchpad register */
2598                 Data = 0x00;
2599                 status = mos7840_set_uart_reg(serial->port[i],
2600                                                 SCRATCH_PAD_REGISTER, Data);
2601                 if (status < 0) {
2602                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2603                             status);
2604                         break;
2605                 } else
2606                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2607                             status);
2608
2609                 /* Zero Length flag register */
2610                 if ((mos7840_port->port_num != 1)
2611                     && (serial->num_ports == 2)) {
2612
2613                         Data = 0xff;
2614                         status = mos7840_set_reg_sync(serial->port[i],
2615                                       (__u16) (ZLP_REG1 +
2616                                       ((__u16)mos7840_port->port_num)), Data);
2617                         dbg("ZLIP offset%x\n",
2618                             (__u16) (ZLP_REG1 +
2619                                         ((__u16) mos7840_port->port_num)));
2620                         if (status < 0) {
2621                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2622                                     i + 2, status);
2623                                 break;
2624                         } else
2625                                 dbg("ZLP_REG%d Writing success status%d\n",
2626                                     i + 2, status);
2627                 } else {
2628                         Data = 0xff;
2629                         status = mos7840_set_reg_sync(serial->port[i],
2630                               (__u16) (ZLP_REG1 +
2631                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2632                         dbg("ZLIP offset%x\n",
2633                             (__u16) (ZLP_REG1 +
2634                                      ((__u16) mos7840_port->port_num) - 0x1));
2635                         if (status < 0) {
2636                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2637                                     i + 1, status);
2638                                 break;
2639                         } else
2640                                 dbg("ZLP_REG%d Writing success status%d\n",
2641                                     i + 1, status);
2642
2643                 }
2644                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2645                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2646                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2647                                                                 GFP_KERNEL);
2648                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2649                                                         !mos7840_port->dr) {
2650                         status = -ENOMEM;
2651                         goto error;
2652                 }
2653         }
2654
2655         /* Zero Length flag enable */
2656         Data = 0x0f;
2657         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2658         if (status < 0) {
2659                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2660                 goto error;
2661         } else
2662                 dbg("ZLP_REG5 Writing success status%d\n", status);
2663
2664         /* setting configuration feature to one */
2665         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2666                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2667         return 0;
2668 error:
2669         for (/* nothing */; i >= 0; i--) {
2670                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2671
2672                 kfree(mos7840_port->dr);
2673                 kfree(mos7840_port->ctrl_buf);
2674                 usb_free_urb(mos7840_port->control_urb);
2675                 kfree(mos7840_port);
2676                 serial->port[i] = NULL;
2677         }
2678         return status;
2679 }
2680
2681 /****************************************************************************
2682  * mos7840_shutdown
2683  *      This function is called whenever the device is removed from the usb bus.
2684  ****************************************************************************/
2685
2686 static void mos7840_shutdown(struct usb_serial *serial)
2687 {
2688         int i;
2689         unsigned long flags;
2690         struct moschip_port *mos7840_port;
2691         dbg("%s \n", " shutdown :entering..........");
2692
2693         if (!serial) {
2694                 dbg("%s", "Invalid Handler \n");
2695                 return;
2696         }
2697
2698         /* check for the ports to be closed,close the ports and disconnect */
2699
2700         /* free private structure allocated for serial port  *
2701          * stop reads and writes on all ports                */
2702
2703         for (i = 0; i < serial->num_ports; ++i) {
2704                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2705                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2706                 if (mos7840_port) {
2707                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2708                         mos7840_port->zombie = 1;
2709                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2710                         usb_kill_urb(mos7840_port->control_urb);
2711                         kfree(mos7840_port->ctrl_buf);
2712                         kfree(mos7840_port->dr);
2713                         kfree(mos7840_port);
2714                 }
2715                 mos7840_set_port_private(serial->port[i], NULL);
2716         }
2717
2718         dbg("%s\n", "Thank u :: ");
2719
2720 }
2721
2722 static struct usb_driver io_driver = {
2723         .name = "mos7840",
2724         .probe = usb_serial_probe,
2725         .disconnect = usb_serial_disconnect,
2726         .id_table = moschip_id_table_combined,
2727         .no_dynamic_id = 1,
2728 };
2729
2730 static struct usb_serial_driver moschip7840_4port_device = {
2731         .driver = {
2732                    .owner = THIS_MODULE,
2733                    .name = "mos7840",
2734                    },
2735         .description = DRIVER_DESC,
2736         .usb_driver = &io_driver,
2737         .id_table = moschip_port_id_table,
2738         .num_ports = 4,
2739         .open = mos7840_open,
2740         .close = mos7840_close,
2741         .write = mos7840_write,
2742         .write_room = mos7840_write_room,
2743         .chars_in_buffer = mos7840_chars_in_buffer,
2744         .throttle = mos7840_throttle,
2745         .unthrottle = mos7840_unthrottle,
2746         .calc_num_ports = mos7840_calc_num_ports,
2747 #ifdef MCSSerialProbe
2748         .probe = mos7840_serial_probe,
2749 #endif
2750         .ioctl = mos7840_ioctl,
2751         .set_termios = mos7840_set_termios,
2752         .break_ctl = mos7840_break,
2753         .tiocmget = mos7840_tiocmget,
2754         .tiocmset = mos7840_tiocmset,
2755         .attach = mos7840_startup,
2756         .shutdown = mos7840_shutdown,
2757         .read_bulk_callback = mos7840_bulk_in_callback,
2758         .read_int_callback = mos7840_interrupt_callback,
2759 };
2760
2761 /****************************************************************************
2762  * moschip7840_init
2763  *      This is called by the module subsystem, or on startup to initialize us
2764  ****************************************************************************/
2765 static int __init moschip7840_init(void)
2766 {
2767         int retval;
2768
2769         dbg("%s \n", " mos7840_init :entering..........");
2770
2771         /* Register with the usb serial */
2772         retval = usb_serial_register(&moschip7840_4port_device);
2773
2774         if (retval)
2775                 goto failed_port_device_register;
2776
2777         dbg("%s\n", "Entring...");
2778         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2779                DRIVER_DESC "\n");
2780
2781         /* Register with the usb */
2782         retval = usb_register(&io_driver);
2783         if (retval == 0) {
2784                 dbg("%s\n", "Leaving...");
2785                 return 0;
2786         }
2787         usb_serial_deregister(&moschip7840_4port_device);
2788 failed_port_device_register:
2789         return retval;
2790 }
2791
2792 /****************************************************************************
2793  * moschip7840_exit
2794  *      Called when the driver is about to be unloaded.
2795  ****************************************************************************/
2796 static void __exit moschip7840_exit(void)
2797 {
2798
2799         dbg("%s \n", " mos7840_exit :entering..........");
2800
2801         usb_deregister(&io_driver);
2802
2803         usb_serial_deregister(&moschip7840_4port_device);
2804
2805         dbg("%s\n", "Entring...");
2806 }
2807
2808 module_init(moschip7840_init);
2809 module_exit(moschip7840_exit);
2810
2811 /* Module information */
2812 MODULE_DESCRIPTION(DRIVER_DESC);
2813 MODULE_LICENSE("GPL");
2814
2815 module_param(debug, bool, S_IRUGO | S_IWUSR);
2816 MODULE_PARM_DESC(debug, "Debug enabled or not");