drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/smp_lock.h>
  30 #include <linux/tty.h>
  31 #include <linux/tty_driver.h>
  32 #include <linux/tty_flip.h>
  33 #include <linux/module.h>
  34 #include <linux/serial.h>
  35 #include <linux/usb.h>
  36 #include <linux/usb/serial.h>
  37 #include <linux/uaccess.h>
  38
  39 /*
  40  * Version Information
  41  */
  42 #define DRIVER_VERSION "1.3.2"
  43 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  44
  45 /*
  46  * 16C50 UART register defines
  47  */
  48
  49 #define LCR_BITS_5             0x00     /* 5 bits/char */
  50 #define LCR_BITS_6             0x01     /* 6 bits/char */
  51 #define LCR_BITS_7             0x02     /* 7 bits/char */
  52 #define LCR_BITS_8             0x03     /* 8 bits/char */
  53 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  54
  55 #define LCR_STOP_1             0x00     /* 1 stop bit */
  56 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  57 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  58 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  59
  60 #define LCR_PAR_NONE           0x00     /* No parity */
  61 #define LCR_PAR_ODD            0x08     /* Odd parity */
  62 #define LCR_PAR_EVEN           0x18     /* Even parity */
  63 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  64 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  65 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  66
  67 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  68 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  69
  70 #define MCR_DTR                0x01     /* Assert DTR */
  71 #define MCR_RTS                0x02     /* Assert RTS */
  72 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  73 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  74 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  75 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  76
  77 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  78 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  79 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  80 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  81
  82 /*
  83  * Defines used for sending commands to port
  84  */
  85
  86 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  87 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  88
  89 #define MOS_PORT1       0x0200
  90 #define MOS_PORT2       0x0300
  91 #define MOS_VENREG      0x0000
  92 #define MOS_MAX_PORT    0x02
  93 #define MOS_WRITE       0x0E
  94 #define MOS_READ        0x0D
  95
  96 /* Requests */
  97 #define MCS_RD_RTYPE    0xC0
  98 #define MCS_WR_RTYPE    0x40
  99 #define MCS_RDREQ       0x0D
 100 #define MCS_WRREQ       0x0E
 101 #define MCS_CTRL_TIMEOUT        500
 102 #define VENDOR_READ_LENGTH      (0x01)
 103
 104 #define MAX_NAME_LEN    64
 105
 106 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 107 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 108
 109 /* For higher baud Rates use TIOCEXBAUD */
 110 #define TIOCEXBAUD     0x5462
 111
 112 /* vendor id and device id defines */
 113
 114 /* The native mos7840/7820 component */
 115 #define USB_VENDOR_ID_MOSCHIP           0x9710
 116 #define MOSCHIP_DEVICE_ID_7840          0x7840
 117 #define MOSCHIP_DEVICE_ID_7820          0x7820
 118 /* The native component can have its vendor/device id's overridden
 119  * in vendor-specific implementations.  Such devices can be handled
 120  * by making a change here, in moschip_port_id_table, and in
 121  * moschip_id_table_combined
 122  */
 123 #define USB_VENDOR_ID_BANDB             0x0856
 124 #define BANDB_DEVICE_ID_USO9ML2_2       0xAC22
 125 #define BANDB_DEVICE_ID_USO9ML2_4       0xAC24
 126 #define BANDB_DEVICE_ID_US9ML2_2        0xAC29
 127 #define BANDB_DEVICE_ID_US9ML2_4        0xAC30
 128 #define BANDB_DEVICE_ID_USPTL4_2        0xAC31
 129 #define BANDB_DEVICE_ID_USPTL4_4        0xAC32
 130 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 131 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 132 #define BANDB_DEVICE_ID_USOPTL2_4       0xAC24
 133
 134 /* This driver also supports
 135  * ATEN UC2324 device using Moschip MCS7840
 136  * ATEN UC2322 device using Moschip MCS7820
 137  */
 138 #define USB_VENDOR_ID_ATENINTL          0x0557
 139 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 140 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 141
 142 /* Interrupt Routine Defines    */
 143
 144 #define SERIAL_IIR_RLS      0x06
 145 #define SERIAL_IIR_MS       0x00
 146
 147 /*
 148  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 149  */
 150 #define SERIAL_LSR_DR       0x0001
 151 #define SERIAL_LSR_OE       0x0002
 152 #define SERIAL_LSR_PE       0x0004
 153 #define SERIAL_LSR_FE       0x0008
 154 #define SERIAL_LSR_BI       0x0010
 155
 156 #define MOS_MSR_DELTA_CTS   0x10
 157 #define MOS_MSR_DELTA_DSR   0x20
 158 #define MOS_MSR_DELTA_RI    0x40
 159 #define MOS_MSR_DELTA_CD    0x80
 160
 161 /* Serial Port register Address */
 162 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 163 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 164 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 165 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 166 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 167 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 168 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 169 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 170 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 171
 172 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 173 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 174
 175 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 176
 177 /*
 178  * URB POOL related defines
 179  */
 180 #define NUM_URBS                        16      /* URB Count */
 181 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 182
 183
 184 static struct usb_device_id moschip_port_id_table[] = {
 185         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 186         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 187         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 188         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 189         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 190         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 191         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 196         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 197         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 198         {}                      /* terminating entry */
 199 };
 200
 201 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 202         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 203         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 208         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 209         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 210         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 211         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 212         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 213         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 214         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 215         {}                      /* terminating entry */
 216 };
 217
 218 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 219
 220 /* This structure holds all of the local port information */
 221
 222 struct moschip_port {
 223         int port_num;           /*Actual port number in the device(1,2,etc) */
 224         struct urb *write_urb;  /* write URB for this port */
 225         struct urb *read_urb;   /* read URB for this port */
 226         struct urb *int_urb;
 227         __u8 shadowLCR;         /* last LCR value received */
 228         __u8 shadowMCR;         /* last MCR value received */
 229         char open;
 230         char open_ports;
 231         char zombie;
 232         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 233         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 234         int delta_msr_cond;
 235         struct async_icount icount;
 236         struct usb_serial_port *port;   /* loop back to the owner of this object */
 237
 238         /* Offsets */
 239         __u8 SpRegOffset;
 240         __u8 ControlRegOffset;
 241         __u8 DcrRegOffset;
 242         /* for processing control URBS in interrupt context */
 243         struct urb *control_urb;
 244         struct usb_ctrlrequest *dr;
 245         char *ctrl_buf;
 246         int MsrLsr;
 247
 248         spinlock_t pool_lock;
 249         struct urb *write_urb_pool[NUM_URBS];
 250         char busy[NUM_URBS];
 251         bool read_urb_busy;
 252 };
 253
 254
 255 static int debug;
 256
 257 /*
 258  * mos7840_set_reg_sync
 259  *      To set the Control register by calling usb_fill_control_urb function
 260  *      by passing usb_sndctrlpipe function as parameter.
 261  */
 262
 263 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 264                                 __u16 val)
 265 {
 266         struct usb_device *dev = port->serial->dev;
 267         val = val & 0x00ff;
 268         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 269
 270         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 271                                MCS_WR_RTYPE, val, reg, NULL, 0,
 272                                MOS_WDR_TIMEOUT);
 273 }
 274
 275 /*
 276  * mos7840_get_reg_sync
 277  *      To set the Uart register by calling usb_fill_control_urb function by
 278  *      passing usb_rcvctrlpipe function as parameter.
 279  */
 280
 281 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 282                                 __u16 *val)
 283 {
 284         struct usb_device *dev = port->serial->dev;
 285         int ret = 0;
 286
 287         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 288                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 289                               MOS_WDR_TIMEOUT);
 290         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 291         *val = (*val) & 0x00ff;
 292         return ret;
 293 }
 294
 295 /*
 296  * mos7840_set_uart_reg
 297  *      To set the Uart register by calling usb_fill_control_urb function by
 298  *      passing usb_sndctrlpipe function as parameter.
 299  */
 300
 301 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 302                                 __u16 val)
 303 {
 304
 305         struct usb_device *dev = port->serial->dev;
 306         val = val & 0x00ff;
 307         /* For the UART control registers, the application number need
 308            to be Or'ed */
 309         if (port->serial->num_ports == 4) {
 310                 val |= (((__u16) port->number -
 311                                 (__u16) (port->serial->minor)) + 1) << 8;
 312                 dbg("mos7840_set_uart_reg application number is %x", val);
 313         } else {
 314                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 315                         val |= (((__u16) port->number -
 316                               (__u16) (port->serial->minor)) + 1) << 8;
 317                         dbg("mos7840_set_uart_reg application number is %x",
 318                             val);
 319                 } else {
 320                         val |=
 321                             (((__u16) port->number -
 322                               (__u16) (port->serial->minor)) + 2) << 8;
 323                         dbg("mos7840_set_uart_reg application number is %x",
 324                             val);
 325                 }
 326         }
 327         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 328                                MCS_WR_RTYPE, val, reg, NULL, 0,
 329                                MOS_WDR_TIMEOUT);
 330
 331 }
 332
 333 /*
 334  * mos7840_get_uart_reg
 335  *      To set the Control register by calling usb_fill_control_urb function
 336  *      by passing usb_rcvctrlpipe function as parameter.
 337  */
 338 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 339                                 __u16 *val)
 340 {
 341         struct usb_device *dev = port->serial->dev;
 342         int ret = 0;
 343         __u16 Wval;
 344
 345         /* dbg("application number is %4x",
 346             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 347         /* Wval  is same as application number */
 348         if (port->serial->num_ports == 4) {
 349                 Wval =
 350                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 351                      1) << 8;
 352                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 353         } else {
 354                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 355                         Wval = (((__u16) port->number -
 356                               (__u16) (port->serial->minor)) + 1) << 8;
 357                         dbg("mos7840_get_uart_reg application number is %x",
 358                             Wval);
 359                 } else {
 360                         Wval = (((__u16) port->number -
 361                               (__u16) (port->serial->minor)) + 2) << 8;
 362                         dbg("mos7840_get_uart_reg application number is %x",
 363                             Wval);
 364                 }
 365         }
 366         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 367                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 368                               MOS_WDR_TIMEOUT);
 369         *val = (*val) & 0x00ff;
 370         return ret;
 371 }
 372
 373 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 374 {
 375
 376         dbg("***************************************");
 377         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 378         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 379         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 380         dbg("***************************************");
 381
 382 }
 383
 384 /************************************************************************/
 385 /************************************************************************/
 386 /*             I N T E R F A C E   F U N C T I O N S                    */
 387 /*             I N T E R F A C E   F U N C T I O N S                    */
 388 /************************************************************************/
 389 /************************************************************************/
 390
 391 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 392                                             struct moschip_port *data)
 393 {
 394         usb_set_serial_port_data(port, (void *)data);
 395 }
 396
 397 static inline struct moschip_port *mos7840_get_port_private(struct
 398                                                             usb_serial_port
 399                                                             *port)
 400 {
 401         return (struct moschip_port *)usb_get_serial_port_data(port);
 402 }
 403
 404 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 405 {
 406         struct moschip_port *mos7840_port;
 407         struct async_icount *icount;
 408         mos7840_port = port;
 409         icount = &mos7840_port->icount;
 410         if (new_msr &
 411             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 412              MOS_MSR_DELTA_CD)) {
 413                 icount = &mos7840_port->icount;
 414
 415                 /* update input line counters */
 416                 if (new_msr & MOS_MSR_DELTA_CTS) {
 417                         icount->cts++;
 418                         smp_wmb();
 419                 }
 420                 if (new_msr & MOS_MSR_DELTA_DSR) {
 421                         icount->dsr++;
 422                         smp_wmb();
 423                 }
 424                 if (new_msr & MOS_MSR_DELTA_CD) {
 425                         icount->dcd++;
 426                         smp_wmb();
 427                 }
 428                 if (new_msr & MOS_MSR_DELTA_RI) {
 429                         icount->rng++;
 430                         smp_wmb();
 431                 }
 432         }
 433 }
 434
 435 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 436 {
 437         struct async_icount *icount;
 438
 439         dbg("%s - %02x", __func__, new_lsr);
 440
 441         if (new_lsr & SERIAL_LSR_BI) {
 442                 /*
 443                  * Parity and Framing errors only count if they
 444                  * occur exclusive of a break being
 445                  * received.
 446                  */
 447                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 448         }
 449
 450         /* update input line counters */
 451         icount = &port->icount;
 452         if (new_lsr & SERIAL_LSR_BI) {
 453                 icount->brk++;
 454                 smp_wmb();
 455         }
 456         if (new_lsr & SERIAL_LSR_OE) {
 457                 icount->overrun++;
 458                 smp_wmb();
 459         }
 460         if (new_lsr & SERIAL_LSR_PE) {
 461                 icount->parity++;
 462                 smp_wmb();
 463         }
 464         if (new_lsr & SERIAL_LSR_FE) {
 465                 icount->frame++;
 466                 smp_wmb();
 467         }
 468 }
 469
 470 /************************************************************************/
 471 /************************************************************************/
 472 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 473 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 474 /************************************************************************/
 475 /************************************************************************/
 476
 477 static void mos7840_control_callback(struct urb *urb)
 478 {
 479         unsigned char *data;
 480         struct moschip_port *mos7840_port;
 481         __u8 regval = 0x0;
 482         int result = 0;
 483         int status = urb->status;
 484
 485         mos7840_port = urb->context;
 486
 487         switch (status) {
 488         case 0:
 489                 /* success */
 490                 break;
 491         case -ECONNRESET:
 492         case -ENOENT:
 493         case -ESHUTDOWN:
 494                 /* this urb is terminated, clean up */
 495                 dbg("%s - urb shutting down with status: %d", __func__,
 496                     status);
 497                 return;
 498         default:
 499                 dbg("%s - nonzero urb status received: %d", __func__,
 500                     status);
 501                 goto exit;
 502         }
 503
 504         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 505         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 506             mos7840_port->MsrLsr, mos7840_port->port_num);
 507         data = urb->transfer_buffer;
 508         regval = (__u8) data[0];
 509         dbg("%s data is %x", __func__, regval);
 510         if (mos7840_port->MsrLsr == 0)
 511                 mos7840_handle_new_msr(mos7840_port, regval);
 512         else if (mos7840_port->MsrLsr == 1)
 513                 mos7840_handle_new_lsr(mos7840_port, regval);
 514
 515 exit:
 516         spin_lock(&mos7840_port->pool_lock);
 517         if (!mos7840_port->zombie)
 518                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 519         spin_unlock(&mos7840_port->pool_lock);
 520         if (result) {
 521                 dev_err(&urb->dev->dev,
 522                         "%s - Error %d submitting interrupt urb\n",
 523                         __func__, result);
 524         }
 525 }
 526
 527 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 528                            __u16 *val)
 529 {
 530         struct usb_device *dev = mcs->port->serial->dev;
 531         struct usb_ctrlrequest *dr = mcs->dr;
 532         unsigned char *buffer = mcs->ctrl_buf;
 533         int ret;
 534
 535         dr->bRequestType = MCS_RD_RTYPE;
 536         dr->bRequest = MCS_RDREQ;
 537         dr->wValue = cpu_to_le16(Wval); /* 0 */
 538         dr->wIndex = cpu_to_le16(reg);
 539         dr->wLength = cpu_to_le16(2);
 540
 541         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 542                              (unsigned char *)dr, buffer, 2,
 543                              mos7840_control_callback, mcs);
 544         mcs->control_urb->transfer_buffer_length = 2;
 545         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 546         return ret;
 547 }
 548
 549 /*****************************************************************************
 550  * mos7840_interrupt_callback
 551  *      this is the callback function for when we have received data on the
 552  *      interrupt endpoint.
 553  *****************************************************************************/
 554
 555 static void mos7840_interrupt_callback(struct urb *urb)
 556 {
 557         int result;
 558         int length;
 559         struct moschip_port *mos7840_port;
 560         struct usb_serial *serial;
 561         __u16 Data;
 562         unsigned char *data;
 563         __u8 sp[5], st;
 564         int i, rv = 0;
 565         __u16 wval, wreg = 0;
 566         int status = urb->status;
 567
 568         dbg("%s", " : Entering");
 569
 570         switch (status) {
 571         case 0:
 572                 /* success */
 573                 break;
 574         case -ECONNRESET:
 575         case -ENOENT:
 576         case -ESHUTDOWN:
 577                 /* this urb is terminated, clean up */
 578                 dbg("%s - urb shutting down with status: %d", __func__,
 579                     status);
 580                 return;
 581         default:
 582                 dbg("%s - nonzero urb status received: %d", __func__,
 583                     status);
 584                 goto exit;
 585         }
 586
 587         length = urb->actual_length;
 588         data = urb->transfer_buffer;
 589
 590         serial = urb->context;
 591
 592         /* Moschip get 5 bytes
 593          * Byte 1 IIR Port 1 (port.number is 0)
 594          * Byte 2 IIR Port 2 (port.number is 1)
 595          * Byte 3 IIR Port 3 (port.number is 2)
 596          * Byte 4 IIR Port 4 (port.number is 3)
 597          * Byte 5 FIFO status for both */
 598
 599         if (length && length > 5) {
 600                 dbg("%s", "Wrong data !!!");
 601                 return;
 602         }
 603
 604         sp[0] = (__u8) data[0];
 605         sp[1] = (__u8) data[1];
 606         sp[2] = (__u8) data[2];
 607         sp[3] = (__u8) data[3];
 608         st = (__u8) data[4];
 609
 610         for (i = 0; i < serial->num_ports; i++) {
 611                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 612                 wval =
 613                     (((__u16) serial->port[i]->number -
 614                       (__u16) (serial->minor)) + 1) << 8;
 615                 if (mos7840_port->open) {
 616                         if (sp[i] & 0x01) {
 617                                 dbg("SP%d No Interrupt !!!", i);
 618                         } else {
 619                                 switch (sp[i] & 0x0f) {
 620                                 case SERIAL_IIR_RLS:
 621                                         dbg("Serial Port %d: Receiver status error or ", i);
 622                                         dbg("address bit detected in 9-bit mode");
 623                                         mos7840_port->MsrLsr = 1;
 624                                         wreg = LINE_STATUS_REGISTER;
 625                                         break;
 626                                 case SERIAL_IIR_MS:
 627                                         dbg("Serial Port %d: Modem status change", i);
 628                                         mos7840_port->MsrLsr = 0;
 629                                         wreg = MODEM_STATUS_REGISTER;
 630                                         break;
 631                                 }
 632                                 spin_lock(&mos7840_port->pool_lock);
 633                                 if (!mos7840_port->zombie) {
 634                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 635                                 } else {
 636                                         spin_unlock(&mos7840_port->pool_lock);
 637                                         return;
 638                                 }
 639                                 spin_unlock(&mos7840_port->pool_lock);
 640                         }
 641                 }
 642         }
 643         if (!(rv < 0))
 644                 /* the completion handler for the control urb will resubmit */
 645                 return;
 646 exit:
 647         result = usb_submit_urb(urb, GFP_ATOMIC);
 648         if (result) {
 649                 dev_err(&urb->dev->dev,
 650                         "%s - Error %d submitting interrupt urb\n",
 651                         __func__, result);
 652         }
 653 }
 654
 655 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 656                                        const char *function)
 657 {
 658         if (!port) {
 659                 dbg("%s - port == NULL", function);
 660                 return -1;
 661         }
 662         if (!port->serial) {
 663                 dbg("%s - port->serial == NULL", function);
 664                 return -1;
 665         }
 666
 667         return 0;
 668 }
 669
 670 /* Inline functions to check the sanity of a pointer that is passed to us */
 671 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 672                                          const char *function)
 673 {
 674         if (!serial) {
 675                 dbg("%s - serial == NULL", function);
 676                 return -1;
 677         }
 678         if (!serial->type) {
 679                 dbg("%s - serial->type == NULL!", function);
 680                 return -1;
 681         }
 682
 683         return 0;
 684 }
 685
 686 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 687                                                  const char *function)
 688 {
 689         /* if no port was specified, or it fails a paranoia check */
 690         if (!port ||
 691             mos7840_port_paranoia_check(port, function) ||
 692             mos7840_serial_paranoia_check(port->serial, function)) {
 693                 /* then say that we don't have a valid usb_serial thing,
 694                  * which will end up genrating -ENODEV return values */
 695                 return NULL;
 696         }
 697
 698         return port->serial;
 699 }
 700
 701 /*****************************************************************************
 702  * mos7840_bulk_in_callback
 703  *      this is the callback function for when we have received data on the
 704  *      bulk in endpoint.
 705  *****************************************************************************/
 706
 707 static void mos7840_bulk_in_callback(struct urb *urb)
 708 {
 709         int retval;
 710         unsigned char *data;
 711         struct usb_serial *serial;
 712         struct usb_serial_port *port;
 713         struct moschip_port *mos7840_port;
 714         struct tty_struct *tty;
 715         int status = urb->status;
 716
 717         mos7840_port = urb->context;
 718         if (!mos7840_port) {
 719                 dbg("%s", "NULL mos7840_port pointer");
 720                 mos7840_port->read_urb_busy = false;
 721                 return;
 722         }
 723
 724         if (status) {
 725                 dbg("nonzero read bulk status received: %d", status);
 726                 mos7840_port->read_urb_busy = false;
 727                 return;
 728         }
 729
 730         port = (struct usb_serial_port *)mos7840_port->port;
 731         if (mos7840_port_paranoia_check(port, __func__)) {
 732                 dbg("%s", "Port Paranoia failed");
 733                 mos7840_port->read_urb_busy = false;
 734                 return;
 735         }
 736
 737         serial = mos7840_get_usb_serial(port, __func__);
 738         if (!serial) {
 739                 dbg("%s", "Bad serial pointer");
 740                 mos7840_port->read_urb_busy = false;
 741                 return;
 742         }
 743
 744         dbg("%s", "Entering... ");
 745
 746         data = urb->transfer_buffer;
 747
 748         dbg("%s", "Entering ...........");
 749
 750         if (urb->actual_length) {
 751                 tty = tty_port_tty_get(&mos7840_port->port->port);
 752                 if (tty) {
 753                         tty_buffer_request_room(tty, urb->actual_length);
 754                         tty_insert_flip_string(tty, data, urb->actual_length);
 755                         dbg(" %s ", data);
 756                         tty_flip_buffer_push(tty);
 757                         tty_kref_put(tty);
 758                 }
 759                 mos7840_port->icount.rx += urb->actual_length;
 760                 smp_wmb();
 761                 dbg("mos7840_port->icount.rx is %d:",
 762                     mos7840_port->icount.rx);
 763         }
 764
 765         if (!mos7840_port->read_urb) {
 766                 dbg("%s", "URB KILLED !!!");
 767                 mos7840_port->read_urb_busy = false;
 768                 return;
 769         }
 770
 771
 772         mos7840_port->read_urb->dev = serial->dev;
 773
 774         mos7840_port->read_urb_busy = true;
 775         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 776
 777         if (retval) {
 778                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 779                 mos7840_port->read_urb_busy = false;
 780         }
 781 }
 782
 783 /*****************************************************************************
 784  * mos7840_bulk_out_data_callback
 785  *      this is the callback function for when we have finished sending
 786  *      serial data on the bulk out endpoint.
 787  *****************************************************************************/
 788
 789 static void mos7840_bulk_out_data_callback(struct urb *urb)
 790 {
 791         struct moschip_port *mos7840_port;
 792         struct tty_struct *tty;
 793         int status = urb->status;
 794         int i;
 795
 796         mos7840_port = urb->context;
 797         spin_lock(&mos7840_port->pool_lock);
 798         for (i = 0; i < NUM_URBS; i++) {
 799                 if (urb == mos7840_port->write_urb_pool[i]) {
 800                         mos7840_port->busy[i] = 0;
 801                         break;
 802                 }
 803         }
 804         spin_unlock(&mos7840_port->pool_lock);
 805
 806         if (status) {
 807                 dbg("nonzero write bulk status received:%d", status);
 808                 return;
 809         }
 810
 811         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 812                 dbg("%s", "Port Paranoia failed");
 813                 return;
 814         }
 815
 816         dbg("%s", "Entering .........");
 817
 818         tty = tty_port_tty_get(&mos7840_port->port->port);
 819         if (tty && mos7840_port->open)
 820                 tty_wakeup(tty);
 821         tty_kref_put(tty);
 822
 823 }
 824
 825 /************************************************************************/
 826 /*       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       */
 827 /************************************************************************/
 828 #ifdef MCSSerialProbe
 829 static int mos7840_serial_probe(struct usb_serial *serial,
 830                                 const struct usb_device_id *id)
 831 {
 832
 833         /*need to implement the mode_reg reading and updating\
 834            structures usb_serial_ device_type\
 835            (i.e num_ports, num_bulkin,bulkout etc) */
 836         /* Also we can update the changes  attach */
 837         return 1;
 838 }
 839 #endif
 840
 841 /*****************************************************************************
 842  * mos7840_open
 843  *      this function is called by the tty driver when a port is opened
 844  *      If successful, we return 0
 845  *      Otherwise we return a negative error number.
 846  *****************************************************************************/
 847
 848 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 849 {
 850         int response;
 851         int j;
 852         struct usb_serial *serial;
 853         struct urb *urb;
 854         __u16 Data;
 855         int status;
 856         struct moschip_port *mos7840_port;
 857         struct moschip_port *port0;
 858
 859         dbg ("%s enter", __func__);
 860
 861         if (mos7840_port_paranoia_check(port, __func__)) {
 862                 dbg("%s", "Port Paranoia failed");
 863                 return -ENODEV;
 864         }
 865
 866         serial = port->serial;
 867
 868         if (mos7840_serial_paranoia_check(serial, __func__)) {
 869                 dbg("%s", "Serial Paranoia failed");
 870                 return -ENODEV;
 871         }
 872
 873         mos7840_port = mos7840_get_port_private(port);
 874         port0 = mos7840_get_port_private(serial->port[0]);
 875
 876         if (mos7840_port == NULL || port0 == NULL)
 877                 return -ENODEV;
 878
 879         usb_clear_halt(serial->dev, port->write_urb->pipe);
 880         usb_clear_halt(serial->dev, port->read_urb->pipe);
 881         port0->open_ports++;
 882
 883         /* Initialising the write urb pool */
 884         for (j = 0; j < NUM_URBS; ++j) {
 885                 urb = usb_alloc_urb(0, GFP_KERNEL);
 886                 mos7840_port->write_urb_pool[j] = urb;
 887
 888                 if (urb == NULL) {
 889                         dev_err(&port->dev, "No more urbs???\n");
 890                         continue;
 891                 }
 892
 893                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 894                                                                 GFP_KERNEL);
 895                 if (!urb->transfer_buffer) {
 896                         usb_free_urb(urb);
 897                         mos7840_port->write_urb_pool[j] = NULL;
 898                         dev_err(&port->dev,
 899                                 "%s-out of memory for urb buffers.\n",
 900                                 __func__);
 901                         continue;
 902                 }
 903         }
 904
 905 /*****************************************************************************
 906  * Initialize MCS7840 -- Write Init values to corresponding Registers
 907  *
 908  * Register Index
 909  * 1 : IER
 910  * 2 : FCR
 911  * 3 : LCR
 912  * 4 : MCR
 913  *
 914  * 0x08 : SP1/2 Control Reg
 915  *****************************************************************************/
 916
 917         /* NEED to check the following Block */
 918
 919         Data = 0x0;
 920         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 921         if (status < 0) {
 922                 dbg("Reading Spreg failed");
 923                 return -1;
 924         }
 925         Data |= 0x80;
 926         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 927         if (status < 0) {
 928                 dbg("writing Spreg failed");
 929                 return -1;
 930         }
 931
 932         Data &= ~0x80;
 933         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 934         if (status < 0) {
 935                 dbg("writing Spreg failed");
 936                 return -1;
 937         }
 938         /* End of block to be checked */
 939
 940         Data = 0x0;
 941         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 942                                                                         &Data);
 943         if (status < 0) {
 944                 dbg("Reading Controlreg failed");
 945                 return -1;
 946         }
 947         Data |= 0x08;           /* Driver done bit */
 948         Data |= 0x20;           /* rx_disable */
 949         status = mos7840_set_reg_sync(port,
 950                                 mos7840_port->ControlRegOffset, Data);
 951         if (status < 0) {
 952                 dbg("writing Controlreg failed");
 953                 return -1;
 954         }
 955         /* do register settings here */
 956         /* Set all regs to the device default values. */
 957         /***********************************
 958          * First Disable all interrupts.
 959          ***********************************/
 960         Data = 0x00;
 961         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 962         if (status < 0) {
 963                 dbg("disabling interrupts failed");
 964                 return -1;
 965         }
 966         /* Set FIFO_CONTROL_REGISTER to the default value */
 967         Data = 0x00;
 968         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 969         if (status < 0) {
 970                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 971                 return -1;
 972         }
 973
 974         Data = 0xcf;
 975         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 976         if (status < 0) {
 977                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 978                 return -1;
 979         }
 980
 981         Data = 0x03;
 982         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 983         mos7840_port->shadowLCR = Data;
 984
 985         Data = 0x0b;
 986         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 987         mos7840_port->shadowMCR = Data;
 988
 989         Data = 0x00;
 990         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 991         mos7840_port->shadowLCR = Data;
 992
 993         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 994         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 995
 996         Data = 0x0c;
 997         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 998
 999         Data = 0x0;
1000         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1001
1002         Data = 0x00;
1003         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1004
1005         Data = Data & ~SERIAL_LCR_DLAB;
1006         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1007         mos7840_port->shadowLCR = Data;
1008
1009         /* clearing Bulkin and Bulkout Fifo */
1010         Data = 0x0;
1011         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1012
1013         Data = Data | 0x0c;
1014         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1015
1016         Data = Data & ~0x0c;
1017         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1018         /* Finally enable all interrupts */
1019         Data = 0x0c;
1020         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1021
1022         /* clearing rx_disable */
1023         Data = 0x0;
1024         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1025                                                                         &Data);
1026         Data = Data & ~0x20;
1027         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1028                                                                         Data);
1029
1030         /* rx_negate */
1031         Data = 0x0;
1032         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1033                                                                         &Data);
1034         Data = Data | 0x10;
1035         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1036                                                                         Data);
1037
1038         /* Check to see if we've set up our endpoint info yet    *
1039          * (can't set it up in mos7840_startup as the structures *
1040          * were not set up at that time.)                        */
1041         if (port0->open_ports == 1) {
1042                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1043                         /* set up interrupt urb */
1044                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1045                                 serial->dev,
1046                                 usb_rcvintpipe(serial->dev,
1047                                 serial->port[0]->interrupt_in_endpointAddress),
1048                                 serial->port[0]->interrupt_in_buffer,
1049                                 serial->port[0]->interrupt_in_urb->
1050                                 transfer_buffer_length,
1051                                 mos7840_interrupt_callback,
1052                                 serial,
1053                                 serial->port[0]->interrupt_in_urb->interval);
1054
1055                         /* start interrupt read for mos7840               *
1056                          * will continue as long as mos7840 is connected  */
1057
1058                         response =
1059                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1060                                            GFP_KERNEL);
1061                         if (response) {
1062                                 dev_err(&port->dev, "%s - Error %d submitting "
1063                                         "interrupt urb\n", __func__, response);
1064                         }
1065
1066                 }
1067
1068         }
1069
1070         /* see if we've set up our endpoint info yet   *
1071          * (can't set it up in mos7840_startup as the  *
1072          * structures were not set up at that time.)   */
1073
1074         dbg("port number is %d", port->number);
1075         dbg("serial number is %d", port->serial->minor);
1076         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1077         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1078         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1079         dbg("port's number in the device is %d", mos7840_port->port_num);
1080         mos7840_port->read_urb = port->read_urb;
1081
1082         /* set up our bulk in urb */
1083
1084         usb_fill_bulk_urb(mos7840_port->read_urb,
1085                           serial->dev,
1086                           usb_rcvbulkpipe(serial->dev,
1087                                           port->bulk_in_endpointAddress),
1088                           port->bulk_in_buffer,
1089                           mos7840_port->read_urb->transfer_buffer_length,
1090                           mos7840_bulk_in_callback, mos7840_port);
1091
1092         dbg("mos7840_open: bulkin endpoint is %d",
1093             port->bulk_in_endpointAddress);
1094         mos7840_port->read_urb_busy = true;
1095         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1096         if (response) {
1097                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1098                         __func__, response);
1099                 mos7840_port->read_urb_busy = false;
1100         }
1101
1102         /* initialize our wait queues */
1103         init_waitqueue_head(&mos7840_port->wait_chase);
1104         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1105
1106         /* initialize our icount structure */
1107         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1108
1109         /* initialize our port settings */
1110         /* Must set to enable ints! */
1111         mos7840_port->shadowMCR = MCR_MASTER_IE;
1112         /* send a open port command */
1113         mos7840_port->open = 1;
1114         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1115         mos7840_port->icount.tx = 0;
1116         mos7840_port->icount.rx = 0;
1117
1118         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1119                                 serial, mos7840_port, port);
1120
1121         dbg ("%s leave", __func__);
1122
1123         return 0;
1124
1125 }
1126
1127 /*****************************************************************************
1128  * mos7840_chars_in_buffer
1129  *      this function is called by the tty driver when it wants to know how many
1130  *      bytes of data we currently have outstanding in the port (data that has
1131  *      been written, but hasn't made it out the port yet)
1132  *      If successful, we return the number of bytes left to be written in the
1133  *      system,
1134  *      Otherwise we return zero.
1135  *****************************************************************************/
1136
1137 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1138 {
1139         struct usb_serial_port *port = tty->driver_data;
1140         int i;
1141         int chars = 0;
1142         unsigned long flags;
1143         struct moschip_port *mos7840_port;
1144
1145         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1146
1147         if (mos7840_port_paranoia_check(port, __func__)) {
1148                 dbg("%s", "Invalid port");
1149                 return 0;
1150         }
1151
1152         mos7840_port = mos7840_get_port_private(port);
1153         if (mos7840_port == NULL) {
1154                 dbg("%s", "mos7840_break:leaving ...........");
1155                 return 0;
1156         }
1157
1158         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1159         for (i = 0; i < NUM_URBS; ++i)
1160                 if (mos7840_port->busy[i])
1161                         chars += URB_TRANSFER_BUFFER_SIZE;
1162         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1163         dbg("%s - returns %d", __func__, chars);
1164         return chars;
1165
1166 }
1167
1168 /*****************************************************************************
1169  * mos7840_close
1170  *      this function is called by the tty driver when a port is closed
1171  *****************************************************************************/
1172
1173 static void mos7840_close(struct usb_serial_port *port)
1174 {
1175         struct usb_serial *serial;
1176         struct moschip_port *mos7840_port;
1177         struct moschip_port *port0;
1178         int j;
1179         __u16 Data;
1180
1181         dbg("%s", "mos7840_close:entering...");
1182
1183         if (mos7840_port_paranoia_check(port, __func__)) {
1184                 dbg("%s", "Port Paranoia failed");
1185                 return;
1186         }
1187
1188         serial = mos7840_get_usb_serial(port, __func__);
1189         if (!serial) {
1190                 dbg("%s", "Serial Paranoia failed");
1191                 return;
1192         }
1193
1194         mos7840_port = mos7840_get_port_private(port);
1195         port0 = mos7840_get_port_private(serial->port[0]);
1196
1197         if (mos7840_port == NULL || port0 == NULL)
1198                 return;
1199
1200         for (j = 0; j < NUM_URBS; ++j)
1201                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1202
1203         /* Freeing Write URBs */
1204         for (j = 0; j < NUM_URBS; ++j) {
1205                 if (mos7840_port->write_urb_pool[j]) {
1206                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1207                                 kfree(mos7840_port->write_urb_pool[j]->
1208                                       transfer_buffer);
1209
1210                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1211                 }
1212         }
1213
1214         /* While closing port, shutdown all bulk read, write  *
1215          * and interrupt read if they exists                  */
1216         if (serial->dev) {
1217                 if (mos7840_port->write_urb) {
1218                         dbg("%s", "Shutdown bulk write");
1219                         usb_kill_urb(mos7840_port->write_urb);
1220                 }
1221                 if (mos7840_port->read_urb) {
1222                         dbg("%s", "Shutdown bulk read");
1223                         usb_kill_urb(mos7840_port->read_urb);
1224                         mos7840_port->read_urb_busy = false;
1225                 }
1226                 if ((&mos7840_port->control_urb)) {
1227                         dbg("%s", "Shutdown control read");
1228                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1229                 }
1230         }
1231 /*      if(mos7840_port->ctrl_buf != NULL) */
1232 /*              kfree(mos7840_port->ctrl_buf); */
1233         port0->open_ports--;
1234         dbg("mos7840_num_open_ports in close%d:in port%d",
1235             port0->open_ports, port->number);
1236         if (port0->open_ports == 0) {
1237                 if (serial->port[0]->interrupt_in_urb) {
1238                         dbg("%s", "Shutdown interrupt_in_urb");
1239                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1240                 }
1241         }
1242
1243         if (mos7840_port->write_urb) {
1244                 /* if this urb had a transfer buffer already (old tx) free it */
1245                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1246                         kfree(mos7840_port->write_urb->transfer_buffer);
1247                 usb_free_urb(mos7840_port->write_urb);
1248         }
1249
1250         Data = 0x0;
1251         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1252
1253         Data = 0x00;
1254         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1255
1256         mos7840_port->open = 0;
1257
1258         dbg("%s", "Leaving ............");
1259 }
1260
1261 /************************************************************************
1262  *
1263  * mos7840_block_until_chase_response
1264  *
1265  *      This function will block the close until one of the following:
1266  *              1. Response to our Chase comes from mos7840
1267  *              2. A timeout of 10 seconds without activity has expired
1268  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1269  *
1270  ************************************************************************/
1271
1272 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1273                                         struct moschip_port *mos7840_port)
1274 {
1275         int timeout = 1 * HZ;
1276         int wait = 10;
1277         int count;
1278
1279         while (1) {
1280                 count = mos7840_chars_in_buffer(tty);
1281
1282                 /* Check for Buffer status */
1283                 if (count <= 0)
1284                         return;
1285
1286                 /* Block the thread for a while */
1287                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1288                                                timeout);
1289                 /* No activity.. count down section */
1290                 wait--;
1291                 if (wait == 0) {
1292                         dbg("%s - TIMEOUT", __func__);
1293                         return;
1294                 } else {
1295                         /* Reset timeout value back to seconds */
1296                         wait = 10;
1297                 }
1298         }
1299
1300 }
1301
1302 /*****************************************************************************
1303  * mos7840_break
1304  *      this function sends a break to the port
1305  *****************************************************************************/
1306 static void mos7840_break(struct tty_struct *tty, int break_state)
1307 {
1308         struct usb_serial_port *port = tty->driver_data;
1309         unsigned char data;
1310         struct usb_serial *serial;
1311         struct moschip_port *mos7840_port;
1312
1313         dbg("%s", "Entering ...........");
1314         dbg("mos7840_break: Start");
1315
1316         if (mos7840_port_paranoia_check(port, __func__)) {
1317                 dbg("%s", "Port Paranoia failed");
1318                 return;
1319         }
1320
1321         serial = mos7840_get_usb_serial(port, __func__);
1322         if (!serial) {
1323                 dbg("%s", "Serial Paranoia failed");
1324                 return;
1325         }
1326
1327         mos7840_port = mos7840_get_port_private(port);
1328
1329         if (mos7840_port == NULL)
1330                 return;
1331
1332         if (serial->dev)
1333                 /* flush and block until tx is empty */
1334                 mos7840_block_until_chase_response(tty, mos7840_port);
1335
1336         if (break_state == -1)
1337                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1338         else
1339                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1340
1341         /* FIXME: no locking on shadowLCR anywhere in driver */
1342         mos7840_port->shadowLCR = data;
1343         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1344             mos7840_port->shadowLCR);
1345         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1346                              mos7840_port->shadowLCR);
1347
1348         return;
1349 }
1350
1351 /*****************************************************************************
1352  * mos7840_write_room
1353  *      this function is called by the tty driver when it wants to know how many
1354  *      bytes of data we can accept for a specific port.
1355  *      If successful, we return the amount of room that we have for this port
1356  *      Otherwise we return a negative error number.
1357  *****************************************************************************/
1358
1359 static int mos7840_write_room(struct tty_struct *tty)
1360 {
1361         struct usb_serial_port *port = tty->driver_data;
1362         int i;
1363         int room = 0;
1364         unsigned long flags;
1365         struct moschip_port *mos7840_port;
1366
1367         dbg("%s", " mos7840_write_room:entering ...........");
1368
1369         if (mos7840_port_paranoia_check(port, __func__)) {
1370                 dbg("%s", "Invalid port");
1371                 dbg("%s", " mos7840_write_room:leaving ...........");
1372                 return -1;
1373         }
1374
1375         mos7840_port = mos7840_get_port_private(port);
1376         if (mos7840_port == NULL) {
1377                 dbg("%s", "mos7840_break:leaving ...........");
1378                 return -1;
1379         }
1380
1381         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1382         for (i = 0; i < NUM_URBS; ++i) {
1383                 if (!mos7840_port->busy[i])
1384                         room += URB_TRANSFER_BUFFER_SIZE;
1385         }
1386         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1387
1388         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1389         dbg("%s - returns %d", __func__, room);
1390         return room;
1391
1392 }
1393
1394 /*****************************************************************************
1395  * mos7840_write
1396  *      this function is called by the tty driver when data should be written to
1397  *      the port.
1398  *      If successful, we return the number of bytes written, otherwise we
1399  *      return a negative error number.
1400  *****************************************************************************/
1401
1402 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1403                          const unsigned char *data, int count)
1404 {
1405         int status;
1406         int i;
1407         int bytes_sent = 0;
1408         int transfer_size;
1409         unsigned long flags;
1410
1411         struct moschip_port *mos7840_port;
1412         struct usb_serial *serial;
1413         struct urb *urb;
1414         /* __u16 Data; */
1415         const unsigned char *current_position = data;
1416         unsigned char *data1;
1417         dbg("%s", "entering ...........");
1418         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1419                                         mos7840_port->shadowLCR); */
1420
1421 #ifdef NOTMOS7840
1422         Data = 0x00;
1423         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1424         mos7840_port->shadowLCR = Data;
1425         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1426         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1427             mos7840_port->shadowLCR);
1428
1429         /* Data = 0x03; */
1430         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1431         /* mos7840_port->shadowLCR=Data;//Need to add later */
1432
1433         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1434         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1435
1436         /* Data = 0x0c; */
1437         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1438         Data = 0x00;
1439         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1440         dbg("mos7840_write:DLL value is %x", Data);
1441
1442         Data = 0x0;
1443         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1444         dbg("mos7840_write:DLM value is %x", Data);
1445
1446         Data = Data & ~SERIAL_LCR_DLAB;
1447         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1448             mos7840_port->shadowLCR);
1449         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1450 #endif
1451
1452         if (mos7840_port_paranoia_check(port, __func__)) {
1453                 dbg("%s", "Port Paranoia failed");
1454                 return -1;
1455         }
1456
1457         serial = port->serial;
1458         if (mos7840_serial_paranoia_check(serial, __func__)) {
1459                 dbg("%s", "Serial Paranoia failed");
1460                 return -1;
1461         }
1462
1463         mos7840_port = mos7840_get_port_private(port);
1464         if (mos7840_port == NULL) {
1465                 dbg("%s", "mos7840_port is NULL");
1466                 return -1;
1467         }
1468
1469         /* try to find a free urb in the list */
1470         urb = NULL;
1471
1472         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1473         for (i = 0; i < NUM_URBS; ++i) {
1474                 if (!mos7840_port->busy[i]) {
1475                         mos7840_port->busy[i] = 1;
1476                         urb = mos7840_port->write_urb_pool[i];
1477                         dbg("URB:%d", i);
1478                         break;
1479                 }
1480         }
1481         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1482
1483         if (urb == NULL) {
1484                 dbg("%s - no more free urbs", __func__);
1485                 goto exit;
1486         }
1487
1488         if (urb->transfer_buffer == NULL) {
1489                 urb->transfer_buffer =
1490                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1491
1492                 if (urb->transfer_buffer == NULL) {
1493                         dev_err(&port->dev, "%s no more kernel memory...\n",
1494                                 __func__);
1495                         goto exit;
1496                 }
1497         }
1498         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1499
1500         memcpy(urb->transfer_buffer, current_position, transfer_size);
1501
1502         /* fill urb with data and submit  */
1503         usb_fill_bulk_urb(urb,
1504                           serial->dev,
1505                           usb_sndbulkpipe(serial->dev,
1506                                           port->bulk_out_endpointAddress),
1507                           urb->transfer_buffer,
1508                           transfer_size,
1509                           mos7840_bulk_out_data_callback, mos7840_port);
1510
1511         data1 = urb->transfer_buffer;
1512         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1513
1514         /* send it down the pipe */
1515         status = usb_submit_urb(urb, GFP_ATOMIC);
1516
1517         if (status) {
1518                 mos7840_port->busy[i] = 0;
1519                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1520                         "with status = %d\n", __func__, status);
1521                 bytes_sent = status;
1522                 goto exit;
1523         }
1524         bytes_sent = transfer_size;
1525         mos7840_port->icount.tx += transfer_size;
1526         smp_wmb();
1527         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1528 exit:
1529         return bytes_sent;
1530
1531 }
1532
1533 /*****************************************************************************
1534  * mos7840_throttle
1535  *      this function is called by the tty driver when it wants to stop the data
1536  *      being read from the port.
1537  *****************************************************************************/
1538
1539 static void mos7840_throttle(struct tty_struct *tty)
1540 {
1541         struct usb_serial_port *port = tty->driver_data;
1542         struct moschip_port *mos7840_port;
1543         int status;
1544
1545         if (mos7840_port_paranoia_check(port, __func__)) {
1546                 dbg("%s", "Invalid port");
1547                 return;
1548         }
1549
1550         dbg("- port %d", port->number);
1551
1552         mos7840_port = mos7840_get_port_private(port);
1553
1554         if (mos7840_port == NULL)
1555                 return;
1556
1557         if (!mos7840_port->open) {
1558                 dbg("%s", "port not opened");
1559                 return;
1560         }
1561
1562         dbg("%s", "Entering ..........");
1563
1564         /* if we are implementing XON/XOFF, send the stop character */
1565         if (I_IXOFF(tty)) {
1566                 unsigned char stop_char = STOP_CHAR(tty);
1567                 status = mos7840_write(tty, port, &stop_char, 1);
1568                 if (status <= 0)
1569                         return;
1570         }
1571         /* if we are implementing RTS/CTS, toggle that line */
1572         if (tty->termios->c_cflag & CRTSCTS) {
1573                 mos7840_port->shadowMCR &= ~MCR_RTS;
1574                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1575                                          mos7840_port->shadowMCR);
1576                 if (status < 0)
1577                         return;
1578         }
1579
1580         return;
1581 }
1582
1583 /*****************************************************************************
1584  * mos7840_unthrottle
1585  *      this function is called by the tty driver when it wants to resume
1586  *      the data being read from the port (called after mos7840_throttle is
1587  *      called)
1588  *****************************************************************************/
1589 static void mos7840_unthrottle(struct tty_struct *tty)
1590 {
1591         struct usb_serial_port *port = tty->driver_data;
1592         int status;
1593         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1594
1595         if (mos7840_port_paranoia_check(port, __func__)) {
1596                 dbg("%s", "Invalid port");
1597                 return;
1598         }
1599
1600         if (mos7840_port == NULL)
1601                 return;
1602
1603         if (!mos7840_port->open) {
1604                 dbg("%s - port not opened", __func__);
1605                 return;
1606         }
1607
1608         dbg("%s", "Entering ..........");
1609
1610         /* if we are implementing XON/XOFF, send the start character */
1611         if (I_IXOFF(tty)) {
1612                 unsigned char start_char = START_CHAR(tty);
1613                 status = mos7840_write(tty, port, &start_char, 1);
1614                 if (status <= 0)
1615                         return;
1616         }
1617
1618         /* if we are implementing RTS/CTS, toggle that line */
1619         if (tty->termios->c_cflag & CRTSCTS) {
1620                 mos7840_port->shadowMCR |= MCR_RTS;
1621                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1622                                          mos7840_port->shadowMCR);
1623                 if (status < 0)
1624                         return;
1625         }
1626 }
1627
1628 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1629 {
1630         struct usb_serial_port *port = tty->driver_data;
1631         struct moschip_port *mos7840_port;
1632         unsigned int result;
1633         __u16 msr;
1634         __u16 mcr;
1635         int status;
1636         mos7840_port = mos7840_get_port_private(port);
1637
1638         dbg("%s - port %d", __func__, port->number);
1639
1640         if (mos7840_port == NULL)
1641                 return -ENODEV;
1642
1643         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1644         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1645         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1646             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1647             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1648             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1649             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1650             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1651             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1652
1653         dbg("%s - 0x%04X", __func__, result);
1654
1655         return result;
1656 }
1657
1658 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1659                             unsigned int set, unsigned int clear)
1660 {
1661         struct usb_serial_port *port = tty->driver_data;
1662         struct moschip_port *mos7840_port;
1663         unsigned int mcr;
1664         int status;
1665
1666         dbg("%s - port %d", __func__, port->number);
1667
1668         mos7840_port = mos7840_get_port_private(port);
1669
1670         if (mos7840_port == NULL)
1671                 return -ENODEV;
1672
1673         /* FIXME: What locks the port registers ? */
1674         mcr = mos7840_port->shadowMCR;
1675         if (clear & TIOCM_RTS)
1676                 mcr &= ~MCR_RTS;
1677         if (clear & TIOCM_DTR)
1678                 mcr &= ~MCR_DTR;
1679         if (clear & TIOCM_LOOP)
1680                 mcr &= ~MCR_LOOPBACK;
1681
1682         if (set & TIOCM_RTS)
1683                 mcr |= MCR_RTS;
1684         if (set & TIOCM_DTR)
1685                 mcr |= MCR_DTR;
1686         if (set & TIOCM_LOOP)
1687                 mcr |= MCR_LOOPBACK;
1688
1689         mos7840_port->shadowMCR = mcr;
1690
1691         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1692         if (status < 0) {
1693                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1694                 return status;
1695         }
1696
1697         return 0;
1698 }
1699
1700 /*****************************************************************************
1701  * mos7840_calc_baud_rate_divisor
1702  *      this function calculates the proper baud rate divisor for the specified
1703  *      baud rate.
1704  *****************************************************************************/
1705 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1706                                           __u16 *clk_sel_val)
1707 {
1708
1709         dbg("%s - %d", __func__, baudRate);
1710
1711         if (baudRate <= 115200) {
1712                 *divisor = 115200 / baudRate;
1713                 *clk_sel_val = 0x0;
1714         }
1715         if ((baudRate > 115200) && (baudRate <= 230400)) {
1716                 *divisor = 230400 / baudRate;
1717                 *clk_sel_val = 0x10;
1718         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1719                 *divisor = 403200 / baudRate;
1720                 *clk_sel_val = 0x20;
1721         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1722                 *divisor = 460800 / baudRate;
1723                 *clk_sel_val = 0x30;
1724         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1725                 *divisor = 806400 / baudRate;
1726                 *clk_sel_val = 0x40;
1727         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1728                 *divisor = 921600 / baudRate;
1729                 *clk_sel_val = 0x50;
1730         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1731                 *divisor = 1572864 / baudRate;
1732                 *clk_sel_val = 0x60;
1733         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1734                 *divisor = 3145728 / baudRate;
1735                 *clk_sel_val = 0x70;
1736         }
1737         return 0;
1738
1739 #ifdef NOTMCS7840
1740
1741         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1742                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1743                         *divisor = mos7840_divisor_table[i].Divisor;
1744                         return 0;
1745                 }
1746         }
1747
1748         /* After trying for all the standard baud rates    *
1749          * Try calculating the divisor for this baud rate  */
1750
1751         if (baudrate > 75 && baudrate < 230400) {
1752                 /* get the divisor */
1753                 custom = (__u16) (230400L / baudrate);
1754
1755                 /* Check for round off */
1756                 round1 = (__u16) (2304000L / baudrate);
1757                 round = (__u16) (round1 - (custom * 10));
1758                 if (round > 4)
1759                         custom++;
1760                 *divisor = custom;
1761
1762                 dbg(" Baud %d = %d", baudrate, custom);
1763                 return 0;
1764         }
1765
1766         dbg("%s", " Baud calculation Failed...");
1767         return -1;
1768 #endif
1769 }
1770
1771 /*****************************************************************************
1772  * mos7840_send_cmd_write_baud_rate
1773  *      this function sends the proper command to change the baud rate of the
1774  *      specified port.
1775  *****************************************************************************/
1776
1777 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1778                                             int baudRate)
1779 {
1780         int divisor = 0;
1781         int status;
1782         __u16 Data;
1783         unsigned char number;
1784         __u16 clk_sel_val;
1785         struct usb_serial_port *port;
1786
1787         if (mos7840_port == NULL)
1788                 return -1;
1789
1790         port = (struct usb_serial_port *)mos7840_port->port;
1791         if (mos7840_port_paranoia_check(port, __func__)) {
1792                 dbg("%s", "Invalid port");
1793                 return -1;
1794         }
1795
1796         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1797                 dbg("%s", "Invalid Serial");
1798                 return -1;
1799         }
1800
1801         dbg("%s", "Entering ..........");
1802
1803         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1804
1805         dbg("%s - port = %d, baud = %d", __func__,
1806             mos7840_port->port->number, baudRate);
1807         /* reset clk_uart_sel in spregOffset */
1808         if (baudRate > 115200) {
1809 #ifdef HW_flow_control
1810                 /* NOTE: need to see the pther register to modify */
1811                 /* setting h/w flow control bit to 1 */
1812                 Data = 0x2b;
1813                 mos7840_port->shadowMCR = Data;
1814                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1815                                                                         Data);
1816                 if (status < 0) {
1817                         dbg("Writing spreg failed in set_serial_baud");
1818                         return -1;
1819                 }
1820 #endif
1821
1822         } else {
1823 #ifdef HW_flow_control
1824                 / *setting h/w flow control bit to 0 */
1825                 Data = 0xb;
1826                 mos7840_port->shadowMCR = Data;
1827                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1828                                                                         Data);
1829                 if (status < 0) {
1830                         dbg("Writing spreg failed in set_serial_baud");
1831                         return -1;
1832                 }
1833 #endif
1834
1835         }
1836
1837         if (1) {                /* baudRate <= 115200) */
1838                 clk_sel_val = 0x0;
1839                 Data = 0x0;
1840                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1841                                                    &clk_sel_val);
1842                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1843                                                                  &Data);
1844                 if (status < 0) {
1845                         dbg("reading spreg failed in set_serial_baud");
1846                         return -1;
1847                 }
1848                 Data = (Data & 0x8f) | clk_sel_val;
1849                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1850                                                                 Data);
1851                 if (status < 0) {
1852                         dbg("Writing spreg failed in set_serial_baud");
1853                         return -1;
1854                 }
1855                 /* Calculate the Divisor */
1856
1857                 if (status) {
1858                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1859                         return status;
1860                 }
1861                 /* Enable access to divisor latch */
1862                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1863                 mos7840_port->shadowLCR = Data;
1864                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1865
1866                 /* Write the divisor */
1867                 Data = (unsigned char)(divisor & 0xff);
1868                 dbg("set_serial_baud Value to write DLL is %x", Data);
1869                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1870
1871                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1872                 dbg("set_serial_baud Value to write DLM is %x", Data);
1873                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1874
1875                 /* Disable access to divisor latch */
1876                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1877                 mos7840_port->shadowLCR = Data;
1878                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1879
1880         }
1881         return status;
1882 }
1883
1884 /*****************************************************************************
1885  * mos7840_change_port_settings
1886  *      This routine is called to set the UART on the device to match
1887  *      the specified new settings.
1888  *****************************************************************************/
1889
1890 static void mos7840_change_port_settings(struct tty_struct *tty,
1891         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1892 {
1893         int baud;
1894         unsigned cflag;
1895         unsigned iflag;
1896         __u8 lData;
1897         __u8 lParity;
1898         __u8 lStop;
1899         int status;
1900         __u16 Data;
1901         struct usb_serial_port *port;
1902         struct usb_serial *serial;
1903
1904         if (mos7840_port == NULL)
1905                 return;
1906
1907         port = (struct usb_serial_port *)mos7840_port->port;
1908
1909         if (mos7840_port_paranoia_check(port, __func__)) {
1910                 dbg("%s", "Invalid port");
1911                 return;
1912         }
1913
1914         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1915                 dbg("%s", "Invalid Serial");
1916                 return;
1917         }
1918
1919         serial = port->serial;
1920
1921         dbg("%s - port %d", __func__, mos7840_port->port->number);
1922
1923         if (!mos7840_port->open) {
1924                 dbg("%s - port not opened", __func__);
1925                 return;
1926         }
1927
1928         dbg("%s", "Entering ..........");
1929
1930         lData = LCR_BITS_8;
1931         lStop = LCR_STOP_1;
1932         lParity = LCR_PAR_NONE;
1933
1934         cflag = tty->termios->c_cflag;
1935         iflag = tty->termios->c_iflag;
1936
1937         /* Change the number of bits */
1938         if (cflag & CSIZE) {
1939                 switch (cflag & CSIZE) {
1940                 case CS5:
1941                         lData = LCR_BITS_5;
1942                         break;
1943
1944                 case CS6:
1945                         lData = LCR_BITS_6;
1946                         break;
1947
1948                 case CS7:
1949                         lData = LCR_BITS_7;
1950                         break;
1951                 default:
1952                 case CS8:
1953                         lData = LCR_BITS_8;
1954                         break;
1955                 }
1956         }
1957         /* Change the Parity bit */
1958         if (cflag & PARENB) {
1959                 if (cflag & PARODD) {
1960                         lParity = LCR_PAR_ODD;
1961                         dbg("%s - parity = odd", __func__);
1962                 } else {
1963                         lParity = LCR_PAR_EVEN;
1964                         dbg("%s - parity = even", __func__);
1965                 }
1966
1967         } else {
1968                 dbg("%s - parity = none", __func__);
1969         }
1970
1971         if (cflag & CMSPAR)
1972                 lParity = lParity | 0x20;
1973
1974         /* Change the Stop bit */
1975         if (cflag & CSTOPB) {
1976                 lStop = LCR_STOP_2;
1977                 dbg("%s - stop bits = 2", __func__);
1978         } else {
1979                 lStop = LCR_STOP_1;
1980                 dbg("%s - stop bits = 1", __func__);
1981         }
1982
1983         /* Update the LCR with the correct value */
1984         mos7840_port->shadowLCR &=
1985             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1986         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1987
1988         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
1989             mos7840_port->shadowLCR);
1990         /* Disable Interrupts */
1991         Data = 0x00;
1992         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1993
1994         Data = 0x00;
1995         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1996
1997         Data = 0xcf;
1998         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1999
2000         /* Send the updated LCR value to the mos7840 */
2001         Data = mos7840_port->shadowLCR;
2002
2003         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2004
2005         Data = 0x00b;
2006         mos7840_port->shadowMCR = Data;
2007         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2008         Data = 0x00b;
2009         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2010
2011         /* set up the MCR register and send it to the mos7840 */
2012
2013         mos7840_port->shadowMCR = MCR_MASTER_IE;
2014         if (cflag & CBAUD)
2015                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2016
2017         if (cflag & CRTSCTS)
2018                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2019         else
2020                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2021
2022         Data = mos7840_port->shadowMCR;
2023         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2024
2025         /* Determine divisor based on baud rate */
2026         baud = tty_get_baud_rate(tty);
2027
2028         if (!baud) {
2029                 /* pick a default, any default... */
2030                 dbg("%s", "Picked default baud...");
2031                 baud = 9600;
2032         }
2033
2034         dbg("%s - baud rate = %d", __func__, baud);
2035         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2036
2037         /* Enable Interrupts */
2038         Data = 0x0c;
2039         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2040
2041         if (mos7840_port->read_urb_busy == false) {
2042                 mos7840_port->read_urb->dev = serial->dev;
2043                 mos7840_port->read_urb_busy = true;
2044                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2045                 if (status) {
2046                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2047                             status);
2048                         mos7840_port->read_urb_busy = false;
2049                 }
2050         }
2051         wake_up(&mos7840_port->delta_msr_wait);
2052         mos7840_port->delta_msr_cond = 1;
2053         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2054             mos7840_port->shadowLCR);
2055
2056         return;
2057 }
2058
2059 /*****************************************************************************
2060  * mos7840_set_termios
2061  *      this function is called by the tty driver when it wants to change
2062  *      the termios structure
2063  *****************************************************************************/
2064
2065 static void mos7840_set_termios(struct tty_struct *tty,
2066                                 struct usb_serial_port *port,
2067                                 struct ktermios *old_termios)
2068 {
2069         int status;
2070         unsigned int cflag;
2071         struct usb_serial *serial;
2072         struct moschip_port *mos7840_port;
2073         dbg("mos7840_set_termios: START");
2074         if (mos7840_port_paranoia_check(port, __func__)) {
2075                 dbg("%s", "Invalid port");
2076                 return;
2077         }
2078
2079         serial = port->serial;
2080
2081         if (mos7840_serial_paranoia_check(serial, __func__)) {
2082                 dbg("%s", "Invalid Serial");
2083                 return;
2084         }
2085
2086         mos7840_port = mos7840_get_port_private(port);
2087
2088         if (mos7840_port == NULL)
2089                 return;
2090
2091         if (!mos7840_port->open) {
2092                 dbg("%s - port not opened", __func__);
2093                 return;
2094         }
2095
2096         dbg("%s", "setting termios - ");
2097
2098         cflag = tty->termios->c_cflag;
2099
2100         dbg("%s - clfag %08x iflag %08x", __func__,
2101             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2102         dbg("%s - old clfag %08x old iflag %08x", __func__,
2103             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2104         dbg("%s - port %d", __func__, port->number);
2105
2106         /* change the port settings to the new ones specified */
2107
2108         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2109
2110         if (!mos7840_port->read_urb) {
2111                 dbg("%s", "URB KILLED !!!!!");
2112                 return;
2113         }
2114
2115         if (mos7840_port->read_urb_busy == false) {
2116                 mos7840_port->read_urb->dev = serial->dev;
2117                 mos7840_port->read_urb_busy = true;
2118                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2119                 if (status) {
2120                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2121                             status);
2122                         mos7840_port->read_urb_busy = false;
2123                 }
2124         }
2125         return;
2126 }
2127
2128 /*****************************************************************************
2129  * mos7840_get_lsr_info - get line status register info
2130  *
2131  * Purpose: Let user call ioctl() to get info when the UART physically
2132  *          is emptied.  On bus types like RS485, the transmitter must
2133  *          release the bus after transmitting. This must be done when
2134  *          the transmit shift register is empty, not be done when the
2135  *          transmit holding register is empty.  This functionality
2136  *          allows an RS485 driver to be written in user space.
2137  *****************************************************************************/
2138
2139 static int mos7840_get_lsr_info(struct tty_struct *tty,
2140                                 unsigned int __user *value)
2141 {
2142         int count;
2143         unsigned int result = 0;
2144
2145         count = mos7840_chars_in_buffer(tty);
2146         if (count == 0) {
2147                 dbg("%s -- Empty", __func__);
2148                 result = TIOCSER_TEMT;
2149         }
2150
2151         if (copy_to_user(value, &result, sizeof(int)))
2152                 return -EFAULT;
2153         return 0;
2154 }
2155
2156 /*****************************************************************************
2157  * mos7840_get_serial_info
2158  *      function to get information about serial port
2159  *****************************************************************************/
2160
2161 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2162                                    struct serial_struct __user *retinfo)
2163 {
2164         struct serial_struct tmp;
2165
2166         if (mos7840_port == NULL)
2167                 return -1;
2168
2169         if (!retinfo)
2170                 return -EFAULT;
2171
2172         memset(&tmp, 0, sizeof(tmp));
2173
2174         tmp.type = PORT_16550A;
2175         tmp.line = mos7840_port->port->serial->minor;
2176         tmp.port = mos7840_port->port->number;
2177         tmp.irq = 0;
2178         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2179         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2180         tmp.baud_base = 9600;
2181         tmp.close_delay = 5 * HZ;
2182         tmp.closing_wait = 30 * HZ;
2183
2184         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2185                 return -EFAULT;
2186         return 0;
2187 }
2188
2189 /*****************************************************************************
2190  * SerialIoctl
2191  *      this function handles any ioctl calls to the driver
2192  *****************************************************************************/
2193
2194 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2195                          unsigned int cmd, unsigned long arg)
2196 {
2197         struct usb_serial_port *port = tty->driver_data;
2198         void __user *argp = (void __user *)arg;
2199         struct moschip_port *mos7840_port;
2200
2201         struct async_icount cnow;
2202         struct async_icount cprev;
2203         struct serial_icounter_struct icount;
2204
2205         if (mos7840_port_paranoia_check(port, __func__)) {
2206                 dbg("%s", "Invalid port");
2207                 return -1;
2208         }
2209
2210         mos7840_port = mos7840_get_port_private(port);
2211
2212         if (mos7840_port == NULL)
2213                 return -1;
2214
2215         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2216
2217         switch (cmd) {
2218                 /* return number of bytes available */
2219
2220         case TIOCSERGETLSR:
2221                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2222                 return mos7840_get_lsr_info(tty, argp);
2223                 return 0;
2224
2225         case TIOCGSERIAL:
2226                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2227                 return mos7840_get_serial_info(mos7840_port, argp);
2228
2229         case TIOCSSERIAL:
2230                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2231                 break;
2232
2233         case TIOCMIWAIT:
2234                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2235                 cprev = mos7840_port->icount;
2236                 while (1) {
2237                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2238                         mos7840_port->delta_msr_cond = 0;
2239                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2240                                                  (mos7840_port->
2241                                                   delta_msr_cond == 1));
2242
2243                         /* see if a signal did it */
2244                         if (signal_pending(current))
2245                                 return -ERESTARTSYS;
2246                         cnow = mos7840_port->icount;
2247                         smp_rmb();
2248                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2249                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2250                                 return -EIO;    /* no change => error */
2251                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2252                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2253                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2254                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2255                                 return 0;
2256                         }
2257                         cprev = cnow;
2258                 }
2259                 /* NOTREACHED */
2260                 break;
2261
2262         case TIOCGICOUNT:
2263                 cnow = mos7840_port->icount;
2264                 smp_rmb();
2265                 icount.cts = cnow.cts;
2266                 icount.dsr = cnow.dsr;
2267                 icount.rng = cnow.rng;
2268                 icount.dcd = cnow.dcd;
2269                 icount.rx = cnow.rx;
2270                 icount.tx = cnow.tx;
2271                 icount.frame = cnow.frame;
2272                 icount.overrun = cnow.overrun;
2273                 icount.parity = cnow.parity;
2274                 icount.brk = cnow.brk;
2275                 icount.buf_overrun = cnow.buf_overrun;
2276
2277                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2278                     port->number, icount.rx, icount.tx);
2279                 if (copy_to_user(argp, &icount, sizeof(icount)))
2280                         return -EFAULT;
2281                 return 0;
2282         default:
2283                 break;
2284         }
2285         return -ENOIOCTLCMD;
2286 }
2287
2288 static int mos7840_calc_num_ports(struct usb_serial *serial)
2289 {
2290         int mos7840_num_ports = 0;
2291
2292         dbg("numberofendpoints: cur %d, alt %d",
2293             (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2294             (int)serial->interface->altsetting->desc.bNumEndpoints);
2295         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2296                 mos7840_num_ports = serial->num_ports = 2;
2297         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2298                 serial->num_bulk_in = 4;
2299                 serial->num_bulk_out = 4;
2300                 mos7840_num_ports = serial->num_ports = 4;
2301         }
2302         dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2303         return mos7840_num_ports;
2304 }
2305
2306 /****************************************************************************
2307  * mos7840_startup
2308  ****************************************************************************/
2309
2310 static int mos7840_startup(struct usb_serial *serial)
2311 {
2312         struct moschip_port *mos7840_port;
2313         struct usb_device *dev;
2314         int i, status;
2315
2316         __u16 Data;
2317         dbg("%s", "mos7840_startup :Entering..........");
2318
2319         if (!serial) {
2320                 dbg("%s", "Invalid Handler");
2321                 return -1;
2322         }
2323
2324         dev = serial->dev;
2325
2326         dbg("%s", "Entering...");
2327         dbg ("mos7840_startup: serial = %p", serial);
2328
2329         /* we set up the pointers to the endpoints in the mos7840_open *
2330          * function, as the structures aren't created yet.             */
2331
2332         /* set up port private structures */
2333         for (i = 0; i < serial->num_ports; ++i) {
2334                 dbg ("mos7840_startup: configuring port %d............", i);
2335                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2336                 if (mos7840_port == NULL) {
2337                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2338                         status = -ENOMEM;
2339                         i--; /* don't follow NULL pointer cleaning up */
2340                         goto error;
2341                 }
2342
2343                 /* Initialize all port interrupt end point to port 0 int
2344                  * endpoint. Our device has only one interrupt end point
2345                  * common to all port */
2346
2347                 mos7840_port->port = serial->port[i];
2348                 mos7840_set_port_private(serial->port[i], mos7840_port);
2349                 spin_lock_init(&mos7840_port->pool_lock);
2350
2351                 /* minor is not initialised until later by
2352                  * usb-serial.c:get_free_serial() and cannot therefore be used
2353                  * to index device instances */
2354                 mos7840_port->port_num = i + 1;
2355                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2356                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2357                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2358                 dbg ("serial->minor = %d", serial->minor);
2359
2360                 if (mos7840_port->port_num == 1) {
2361                         mos7840_port->SpRegOffset = 0x0;
2362                         mos7840_port->ControlRegOffset = 0x1;
2363                         mos7840_port->DcrRegOffset = 0x4;
2364                 } else if ((mos7840_port->port_num == 2)
2365                            && (serial->num_ports == 4)) {
2366                         mos7840_port->SpRegOffset = 0x8;
2367                         mos7840_port->ControlRegOffset = 0x9;
2368                         mos7840_port->DcrRegOffset = 0x16;
2369                 } else if ((mos7840_port->port_num == 2)
2370                            && (serial->num_ports == 2)) {
2371                         mos7840_port->SpRegOffset = 0xa;
2372                         mos7840_port->ControlRegOffset = 0xb;
2373                         mos7840_port->DcrRegOffset = 0x19;
2374                 } else if ((mos7840_port->port_num == 3)
2375                            && (serial->num_ports == 4)) {
2376                         mos7840_port->SpRegOffset = 0xa;
2377                         mos7840_port->ControlRegOffset = 0xb;
2378                         mos7840_port->DcrRegOffset = 0x19;
2379                 } else if ((mos7840_port->port_num == 4)
2380                            && (serial->num_ports == 4)) {
2381                         mos7840_port->SpRegOffset = 0xc;
2382                         mos7840_port->ControlRegOffset = 0xd;
2383                         mos7840_port->DcrRegOffset = 0x1c;
2384                 }
2385                 mos7840_dump_serial_port(mos7840_port);
2386                 mos7840_set_port_private(serial->port[i], mos7840_port);
2387
2388                 /* enable rx_disable bit in control register */
2389                 status = mos7840_get_reg_sync(serial->port[i],
2390                                  mos7840_port->ControlRegOffset, &Data);
2391                 if (status < 0) {
2392                         dbg("Reading ControlReg failed status-0x%x", status);
2393                         break;
2394                 } else
2395                         dbg("ControlReg Reading success val is %x, status%d",
2396                             Data, status);
2397                 Data |= 0x08;   /* setting driver done bit */
2398                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2399                                    modem status reg */
2400
2401                 /* Data |= 0x20; //rx_disable bit */
2402                 status = mos7840_set_reg_sync(serial->port[i],
2403                                          mos7840_port->ControlRegOffset, Data);
2404                 if (status < 0) {
2405                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2406                         break;
2407                 } else
2408                         dbg("ControlReg Writing success(rx_disable) status%d",
2409                             status);
2410
2411                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2412                    and 0x24 in DCR3 */
2413                 Data = 0x01;
2414                 status = mos7840_set_reg_sync(serial->port[i],
2415                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2416                 if (status < 0) {
2417                         dbg("Writing DCR0 failed status-0x%x", status);
2418                         break;
2419                 } else
2420                         dbg("DCR0 Writing success status%d", status);
2421
2422                 Data = 0x05;
2423                 status = mos7840_set_reg_sync(serial->port[i],
2424                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2425                 if (status < 0) {
2426                         dbg("Writing DCR1 failed status-0x%x", status);
2427                         break;
2428                 } else
2429                         dbg("DCR1 Writing success status%d", status);
2430
2431                 Data = 0x24;
2432                 status = mos7840_set_reg_sync(serial->port[i],
2433                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2434                 if (status < 0) {
2435                         dbg("Writing DCR2 failed status-0x%x", status);
2436                         break;
2437                 } else
2438                         dbg("DCR2 Writing success status%d", status);
2439
2440                 /* write values in clkstart0x0 and clkmulti 0x20 */
2441                 Data = 0x0;
2442                 status = mos7840_set_reg_sync(serial->port[i],
2443                                          CLK_START_VALUE_REGISTER, Data);
2444                 if (status < 0) {
2445                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2446                         break;
2447                 } else
2448                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2449
2450                 Data = 0x20;
2451                 status = mos7840_set_reg_sync(serial->port[i],
2452                                         CLK_MULTI_REGISTER, Data);
2453                 if (status < 0) {
2454                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2455                             status);
2456                         goto error;
2457                 } else
2458                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2459                             status);
2460
2461                 /* write value 0x0 to scratchpad register */
2462                 Data = 0x00;
2463                 status = mos7840_set_uart_reg(serial->port[i],
2464                                                 SCRATCH_PAD_REGISTER, Data);
2465                 if (status < 0) {
2466                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2467                             status);
2468                         break;
2469                 } else
2470                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2471                             status);
2472
2473                 /* Zero Length flag register */
2474                 if ((mos7840_port->port_num != 1)
2475                     && (serial->num_ports == 2)) {
2476
2477                         Data = 0xff;
2478                         status = mos7840_set_reg_sync(serial->port[i],
2479                                       (__u16) (ZLP_REG1 +
2480                                       ((__u16)mos7840_port->port_num)), Data);
2481                         dbg("ZLIP offset %x",
2482                             (__u16) (ZLP_REG1 +
2483                                         ((__u16) mos7840_port->port_num)));
2484                         if (status < 0) {
2485                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2486                                     i + 2, status);
2487                                 break;
2488                         } else
2489                                 dbg("ZLP_REG%d Writing success status%d",
2490                                     i + 2, status);
2491                 } else {
2492                         Data = 0xff;
2493                         status = mos7840_set_reg_sync(serial->port[i],
2494                               (__u16) (ZLP_REG1 +
2495                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2496                         dbg("ZLIP offset %x",
2497                             (__u16) (ZLP_REG1 +
2498                                      ((__u16) mos7840_port->port_num) - 0x1));
2499                         if (status < 0) {
2500                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2501                                     i + 1, status);
2502                                 break;
2503                         } else
2504                                 dbg("ZLP_REG%d Writing success status%d",
2505                                     i + 1, status);
2506
2507                 }
2508                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2509                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2510                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2511                                                                 GFP_KERNEL);
2512                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2513                                                         !mos7840_port->dr) {
2514                         status = -ENOMEM;
2515                         goto error;
2516                 }
2517         }
2518         dbg ("mos7840_startup: all ports configured...........");
2519
2520         /* Zero Length flag enable */
2521         Data = 0x0f;
2522         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2523         if (status < 0) {
2524                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2525                 goto error;
2526         } else
2527                 dbg("ZLP_REG5 Writing success status%d", status);
2528
2529         /* setting configuration feature to one */
2530         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2531                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2532         return 0;
2533 error:
2534         for (/* nothing */; i >= 0; i--) {
2535                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2536
2537                 kfree(mos7840_port->dr);
2538                 kfree(mos7840_port->ctrl_buf);
2539                 usb_free_urb(mos7840_port->control_urb);
2540                 kfree(mos7840_port);
2541                 serial->port[i] = NULL;
2542         }
2543         return status;
2544 }
2545
2546 /****************************************************************************
2547  * mos7840_disconnect
2548  *      This function is called whenever the device is removed from the usb bus.
2549  ****************************************************************************/
2550
2551 static void mos7840_disconnect(struct usb_serial *serial)
2552 {
2553         int i;
2554         unsigned long flags;
2555         struct moschip_port *mos7840_port;
2556         dbg("%s", " disconnect :entering..........");
2557
2558         if (!serial) {
2559                 dbg("%s", "Invalid Handler");
2560                 return;
2561         }
2562
2563         /* check for the ports to be closed,close the ports and disconnect */
2564
2565         /* free private structure allocated for serial port  *
2566          * stop reads and writes on all ports                */
2567
2568         for (i = 0; i < serial->num_ports; ++i) {
2569                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2570                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2571                 if (mos7840_port) {
2572                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2573                         mos7840_port->zombie = 1;
2574                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2575                         usb_kill_urb(mos7840_port->control_urb);
2576                 }
2577         }
2578
2579         dbg("%s", "Thank u :: ");
2580
2581 }
2582
2583 /****************************************************************************
2584  * mos7840_release
2585  *      This function is called when the usb_serial structure is freed.
2586  ****************************************************************************/
2587
2588 static void mos7840_release(struct usb_serial *serial)
2589 {
2590         int i;
2591         struct moschip_port *mos7840_port;
2592         dbg("%s", " release :entering..........");
2593
2594         if (!serial) {
2595                 dbg("%s", "Invalid Handler");
2596                 return;
2597         }
2598
2599         /* check for the ports to be closed,close the ports and disconnect */
2600
2601         /* free private structure allocated for serial port  *
2602          * stop reads and writes on all ports                */
2603
2604         for (i = 0; i < serial->num_ports; ++i) {
2605                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2606                 dbg("mos7840_port %d = %p", i, mos7840_port);
2607                 if (mos7840_port) {
2608                         kfree(mos7840_port->ctrl_buf);
2609                         kfree(mos7840_port->dr);
2610                         kfree(mos7840_port);
2611                 }
2612         }
2613
2614         dbg("%s", "Thank u :: ");
2615
2616 }
2617
2618 static struct usb_driver io_driver = {
2619         .name = "mos7840",
2620         .probe = usb_serial_probe,
2621         .disconnect = usb_serial_disconnect,
2622         .id_table = moschip_id_table_combined,
2623         .no_dynamic_id = 1,
2624 };
2625
2626 static struct usb_serial_driver moschip7840_4port_device = {
2627         .driver = {
2628                    .owner = THIS_MODULE,
2629                    .name = "mos7840",
2630                    },
2631         .description = DRIVER_DESC,
2632         .usb_driver = &io_driver,
2633         .id_table = moschip_port_id_table,
2634         .num_ports = 4,
2635         .open = mos7840_open,
2636         .close = mos7840_close,
2637         .write = mos7840_write,
2638         .write_room = mos7840_write_room,
2639         .chars_in_buffer = mos7840_chars_in_buffer,
2640         .throttle = mos7840_throttle,
2641         .unthrottle = mos7840_unthrottle,
2642         .calc_num_ports = mos7840_calc_num_ports,
2643 #ifdef MCSSerialProbe
2644         .probe = mos7840_serial_probe,
2645 #endif
2646         .ioctl = mos7840_ioctl,
2647         .set_termios = mos7840_set_termios,
2648         .break_ctl = mos7840_break,
2649         .tiocmget = mos7840_tiocmget,
2650         .tiocmset = mos7840_tiocmset,
2651         .attach = mos7840_startup,
2652         .disconnect = mos7840_disconnect,
2653         .release = mos7840_release,
2654         .read_bulk_callback = mos7840_bulk_in_callback,
2655         .read_int_callback = mos7840_interrupt_callback,
2656 };
2657
2658 /****************************************************************************
2659  * moschip7840_init
2660  *      This is called by the module subsystem, or on startup to initialize us
2661  ****************************************************************************/
2662 static int __init moschip7840_init(void)
2663 {
2664         int retval;
2665
2666         dbg("%s", " mos7840_init :entering..........");
2667
2668         /* Register with the usb serial */
2669         retval = usb_serial_register(&moschip7840_4port_device);
2670
2671         if (retval)
2672                 goto failed_port_device_register;
2673
2674         dbg("%s", "Entering...");
2675         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2676                DRIVER_DESC "\n");
2677
2678         /* Register with the usb */
2679         retval = usb_register(&io_driver);
2680         if (retval == 0) {
2681                 dbg("%s", "Leaving...");
2682                 return 0;
2683         }
2684         usb_serial_deregister(&moschip7840_4port_device);
2685 failed_port_device_register:
2686         return retval;
2687 }
2688
2689 /****************************************************************************
2690  * moschip7840_exit
2691  *      Called when the driver is about to be unloaded.
2692  ****************************************************************************/
2693 static void __exit moschip7840_exit(void)
2694 {
2695
2696         dbg("%s", " mos7840_exit :entering..........");
2697
2698         usb_deregister(&io_driver);
2699
2700         usb_serial_deregister(&moschip7840_4port_device);
2701
2702         dbg("%s", "Entering...");
2703 }
2704
2705 module_init(moschip7840_init);
2706 module_exit(moschip7840_exit);
2707
2708 /* Module information */
2709 MODULE_DESCRIPTION(DRIVER_DESC);
2710 MODULE_LICENSE("GPL");
2711
2712 module_param(debug, bool, S_IRUGO | S_IWUSR);
2713 MODULE_PARM_DESC(debug, "Debug enabled or not");