drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.2"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 106 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 /* The native mos7840/7820 component */
 114 #define USB_VENDOR_ID_MOSCHIP           0x9710
 115 #define MOSCHIP_DEVICE_ID_7840          0x7840
 116 #define MOSCHIP_DEVICE_ID_7820          0x7820
 117 /* The native component can have its vendor/device id's overridden
 118  * in vendor-specific implementations.  Such devices can be handled
 119  * by making a change here, in moschip_port_id_table, and in
 120  * moschip_id_table_combined
 121  */
 122 #define USB_VENDOR_ID_BANDB              0x0856
 123 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 124 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 125 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 126 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 127 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 128 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 129 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 130 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 131 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 132 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 133 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 134 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 135 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 136
 137 /* This driver also supports
 138  * ATEN UC2324 device using Moschip MCS7840
 139  * ATEN UC2322 device using Moschip MCS7820
 140  */
 141 #define USB_VENDOR_ID_ATENINTL          0x0557
 142 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 143 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 144
 145 /* Interrupt Routine Defines    */
 146
 147 #define SERIAL_IIR_RLS      0x06
 148 #define SERIAL_IIR_MS       0x00
 149
 150 /*
 151  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 152  */
 153 #define SERIAL_LSR_DR       0x0001
 154 #define SERIAL_LSR_OE       0x0002
 155 #define SERIAL_LSR_PE       0x0004
 156 #define SERIAL_LSR_FE       0x0008
 157 #define SERIAL_LSR_BI       0x0010
 158
 159 #define MOS_MSR_DELTA_CTS   0x10
 160 #define MOS_MSR_DELTA_DSR   0x20
 161 #define MOS_MSR_DELTA_RI    0x40
 162 #define MOS_MSR_DELTA_CD    0x80
 163
 164 /* Serial Port register Address */
 165 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 166 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 167 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 168 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 169 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 170 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 171 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 172 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 173 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 174
 175 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 176 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 177 #define GPIO_REGISTER              ((__u16)(0x07))
 178
 179 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 180
 181 /*
 182  * URB POOL related defines
 183  */
 184 #define NUM_URBS                        16      /* URB Count */
 185 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 186
 187
 188 enum mos7840_flag {
 189         MOS7840_FLAG_CTRL_BUSY,
 190 };
 191
 192 static const struct usb_device_id moschip_port_id_table[] = {
 193         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 194         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 208         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 209         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 210         {}                      /* terminating entry */
 211 };
 212
 213 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
 214         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 215         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 216         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 217         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 218         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 219         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 220         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 221         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 222         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 223         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 224         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 225         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 226         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 227         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 228         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 229         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 230         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 231         {}                      /* terminating entry */
 232 };
 233
 234 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 235
 236 /* This structure holds all of the local port information */
 237
 238 struct moschip_port {
 239         int port_num;           /*Actual port number in the device(1,2,etc) */
 240         struct urb *write_urb;  /* write URB for this port */
 241         struct urb *read_urb;   /* read URB for this port */
 242         __u8 shadowLCR;         /* last LCR value received */
 243         __u8 shadowMCR;         /* last MCR value received */
 244         char open;
 245         char open_ports;
 246         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 247         int delta_msr_cond;
 248         struct async_icount icount;
 249         struct usb_serial_port *port;   /* loop back to the owner of this object */
 250
 251         /* Offsets */
 252         __u8 SpRegOffset;
 253         __u8 ControlRegOffset;
 254         __u8 DcrRegOffset;
 255         /* for processing control URBS in interrupt context */
 256         struct urb *control_urb;
 257         struct usb_ctrlrequest *dr;
 258         char *ctrl_buf;
 259         int MsrLsr;
 260
 261         spinlock_t pool_lock;
 262         struct urb *write_urb_pool[NUM_URBS];
 263         char busy[NUM_URBS];
 264         bool read_urb_busy;
 265
 266         unsigned long flags;
 267 };
 268
 269
 270 static int debug;
 271
 272 /*
 273  * mos7840_set_reg_sync
 274  *      To set the Control register by calling usb_fill_control_urb function
 275  *      by passing usb_sndctrlpipe function as parameter.
 276  */
 277
 278 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 279                                 __u16 val)
 280 {
 281         struct usb_device *dev = port->serial->dev;
 282         val = val & 0x00ff;
 283         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 284
 285         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 286                                MCS_WR_RTYPE, val, reg, NULL, 0,
 287                                MOS_WDR_TIMEOUT);
 288 }
 289
 290 /*
 291  * mos7840_get_reg_sync
 292  *      To set the Uart register by calling usb_fill_control_urb function by
 293  *      passing usb_rcvctrlpipe function as parameter.
 294  */
 295
 296 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 297                                 __u16 *val)
 298 {
 299         struct usb_device *dev = port->serial->dev;
 300         int ret = 0;
 301         u8 *buf;
 302
 303         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 304         if (!buf)
 305                 return -ENOMEM;
 306
 307         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 308                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 309                               MOS_WDR_TIMEOUT);
 310         *val = buf[0];
 311         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 312
 313         kfree(buf);
 314         return ret;
 315 }
 316
 317 /*
 318  * mos7840_set_uart_reg
 319  *      To set the Uart register by calling usb_fill_control_urb function by
 320  *      passing usb_sndctrlpipe function as parameter.
 321  */
 322
 323 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 324                                 __u16 val)
 325 {
 326
 327         struct usb_device *dev = port->serial->dev;
 328         val = val & 0x00ff;
 329         /* For the UART control registers, the application number need
 330            to be Or'ed */
 331         if (port->serial->num_ports == 4) {
 332                 val |= (((__u16) port->number -
 333                                 (__u16) (port->serial->minor)) + 1) << 8;
 334                 dbg("mos7840_set_uart_reg application number is %x", val);
 335         } else {
 336                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 337                         val |= (((__u16) port->number -
 338                               (__u16) (port->serial->minor)) + 1) << 8;
 339                         dbg("mos7840_set_uart_reg application number is %x",
 340                             val);
 341                 } else {
 342                         val |=
 343                             (((__u16) port->number -
 344                               (__u16) (port->serial->minor)) + 2) << 8;
 345                         dbg("mos7840_set_uart_reg application number is %x",
 346                             val);
 347                 }
 348         }
 349         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 350                                MCS_WR_RTYPE, val, reg, NULL, 0,
 351                                MOS_WDR_TIMEOUT);
 352
 353 }
 354
 355 /*
 356  * mos7840_get_uart_reg
 357  *      To set the Control register by calling usb_fill_control_urb function
 358  *      by passing usb_rcvctrlpipe function as parameter.
 359  */
 360 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 361                                 __u16 *val)
 362 {
 363         struct usb_device *dev = port->serial->dev;
 364         int ret = 0;
 365         __u16 Wval;
 366         u8 *buf;
 367
 368         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 369         if (!buf)
 370                 return -ENOMEM;
 371
 372         /* dbg("application number is %4x",
 373             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 374         /* Wval  is same as application number */
 375         if (port->serial->num_ports == 4) {
 376                 Wval =
 377                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 378                      1) << 8;
 379                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 380         } else {
 381                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 382                         Wval = (((__u16) port->number -
 383                               (__u16) (port->serial->minor)) + 1) << 8;
 384                         dbg("mos7840_get_uart_reg application number is %x",
 385                             Wval);
 386                 } else {
 387                         Wval = (((__u16) port->number -
 388                               (__u16) (port->serial->minor)) + 2) << 8;
 389                         dbg("mos7840_get_uart_reg application number is %x",
 390                             Wval);
 391                 }
 392         }
 393         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 394                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 395                               MOS_WDR_TIMEOUT);
 396         *val = buf[0];
 397
 398         kfree(buf);
 399         return ret;
 400 }
 401
 402 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 403 {
 404
 405         dbg("***************************************");
 406         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 407         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 408         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 409         dbg("***************************************");
 410
 411 }
 412
 413 /************************************************************************/
 414 /************************************************************************/
 415 /*             I N T E R F A C E   F U N C T I O N S                    */
 416 /*             I N T E R F A C E   F U N C T I O N S                    */
 417 /************************************************************************/
 418 /************************************************************************/
 419
 420 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 421                                             struct moschip_port *data)
 422 {
 423         usb_set_serial_port_data(port, (void *)data);
 424 }
 425
 426 static inline struct moschip_port *mos7840_get_port_private(struct
 427                                                             usb_serial_port
 428                                                             *port)
 429 {
 430         return (struct moschip_port *)usb_get_serial_port_data(port);
 431 }
 432
 433 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 434 {
 435         struct moschip_port *mos7840_port;
 436         struct async_icount *icount;
 437         mos7840_port = port;
 438         icount = &mos7840_port->icount;
 439         if (new_msr &
 440             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 441              MOS_MSR_DELTA_CD)) {
 442                 icount = &mos7840_port->icount;
 443
 444                 /* update input line counters */
 445                 if (new_msr & MOS_MSR_DELTA_CTS) {
 446                         icount->cts++;
 447                         smp_wmb();
 448                 }
 449                 if (new_msr & MOS_MSR_DELTA_DSR) {
 450                         icount->dsr++;
 451                         smp_wmb();
 452                 }
 453                 if (new_msr & MOS_MSR_DELTA_CD) {
 454                         icount->dcd++;
 455                         smp_wmb();
 456                 }
 457                 if (new_msr & MOS_MSR_DELTA_RI) {
 458                         icount->rng++;
 459                         smp_wmb();
 460                 }
 461
 462                 mos7840_port->delta_msr_cond = 1;
 463                 wake_up_interruptible(&port->port->delta_msr_wait);
 464         }
 465 }
 466
 467 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 468 {
 469         struct async_icount *icount;
 470
 471         dbg("%s - %02x", __func__, new_lsr);
 472
 473         if (new_lsr & SERIAL_LSR_BI) {
 474                 /*
 475                  * Parity and Framing errors only count if they
 476                  * occur exclusive of a break being
 477                  * received.
 478                  */
 479                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 480         }
 481
 482         /* update input line counters */
 483         icount = &port->icount;
 484         if (new_lsr & SERIAL_LSR_BI) {
 485                 icount->brk++;
 486                 smp_wmb();
 487         }
 488         if (new_lsr & SERIAL_LSR_OE) {
 489                 icount->overrun++;
 490                 smp_wmb();
 491         }
 492         if (new_lsr & SERIAL_LSR_PE) {
 493                 icount->parity++;
 494                 smp_wmb();
 495         }
 496         if (new_lsr & SERIAL_LSR_FE) {
 497                 icount->frame++;
 498                 smp_wmb();
 499         }
 500 }
 501
 502 /************************************************************************/
 503 /************************************************************************/
 504 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 505 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 506 /************************************************************************/
 507 /************************************************************************/
 508
 509 static void mos7840_control_callback(struct urb *urb)
 510 {
 511         unsigned char *data;
 512         struct moschip_port *mos7840_port;
 513         __u8 regval = 0x0;
 514         int status = urb->status;
 515
 516         mos7840_port = urb->context;
 517
 518         switch (status) {
 519         case 0:
 520                 /* success */
 521                 break;
 522         case -ECONNRESET:
 523         case -ENOENT:
 524         case -ESHUTDOWN:
 525                 /* this urb is terminated, clean up */
 526                 dbg("%s - urb shutting down with status: %d", __func__,
 527                     status);
 528                 goto out;
 529         default:
 530                 dbg("%s - nonzero urb status received: %d", __func__,
 531                     status);
 532                 goto out;
 533         }
 534
 535         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 536         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 537             mos7840_port->MsrLsr, mos7840_port->port_num);
 538         data = urb->transfer_buffer;
 539         regval = (__u8) data[0];
 540         dbg("%s data is %x", __func__, regval);
 541         if (mos7840_port->MsrLsr == 0)
 542                 mos7840_handle_new_msr(mos7840_port, regval);
 543         else if (mos7840_port->MsrLsr == 1)
 544                 mos7840_handle_new_lsr(mos7840_port, regval);
 545 out:
 546         clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
 547 }
 548
 549 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 550                            __u16 *val)
 551 {
 552         struct usb_device *dev = mcs->port->serial->dev;
 553         struct usb_ctrlrequest *dr = mcs->dr;
 554         unsigned char *buffer = mcs->ctrl_buf;
 555         int ret;
 556
 557         if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
 558                 return -EBUSY;
 559
 560         dr->bRequestType = MCS_RD_RTYPE;
 561         dr->bRequest = MCS_RDREQ;
 562         dr->wValue = cpu_to_le16(Wval); /* 0 */
 563         dr->wIndex = cpu_to_le16(reg);
 564         dr->wLength = cpu_to_le16(2);
 565
 566         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 567                              (unsigned char *)dr, buffer, 2,
 568                              mos7840_control_callback, mcs);
 569         mcs->control_urb->transfer_buffer_length = 2;
 570         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 571         if (ret)
 572                 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
 573
 574         return ret;
 575 }
 576
 577 /*****************************************************************************
 578  * mos7840_interrupt_callback
 579  *      this is the callback function for when we have received data on the
 580  *      interrupt endpoint.
 581  *****************************************************************************/
 582
 583 static void mos7840_interrupt_callback(struct urb *urb)
 584 {
 585         int result;
 586         int length;
 587         struct moschip_port *mos7840_port;
 588         struct usb_serial *serial;
 589         __u16 Data;
 590         unsigned char *data;
 591         __u8 sp[5], st;
 592         int i, rv = 0;
 593         __u16 wval, wreg = 0;
 594         int status = urb->status;
 595
 596         dbg("%s", " : Entering");
 597
 598         switch (status) {
 599         case 0:
 600                 /* success */
 601                 break;
 602         case -ECONNRESET:
 603         case -ENOENT:
 604         case -ESHUTDOWN:
 605                 /* this urb is terminated, clean up */
 606                 dbg("%s - urb shutting down with status: %d", __func__,
 607                     status);
 608                 return;
 609         default:
 610                 dbg("%s - nonzero urb status received: %d", __func__,
 611                     status);
 612                 goto exit;
 613         }
 614
 615         length = urb->actual_length;
 616         data = urb->transfer_buffer;
 617
 618         serial = urb->context;
 619
 620         /* Moschip get 5 bytes
 621          * Byte 1 IIR Port 1 (port.number is 0)
 622          * Byte 2 IIR Port 2 (port.number is 1)
 623          * Byte 3 IIR Port 3 (port.number is 2)
 624          * Byte 4 IIR Port 4 (port.number is 3)
 625          * Byte 5 FIFO status for both */
 626
 627         if (length && length > 5) {
 628                 dbg("%s", "Wrong data !!!");
 629                 return;
 630         }
 631
 632         sp[0] = (__u8) data[0];
 633         sp[1] = (__u8) data[1];
 634         sp[2] = (__u8) data[2];
 635         sp[3] = (__u8) data[3];
 636         st = (__u8) data[4];
 637
 638         for (i = 0; i < serial->num_ports; i++) {
 639                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 640                 wval =
 641                     (((__u16) serial->port[i]->number -
 642                       (__u16) (serial->minor)) + 1) << 8;
 643                 if (mos7840_port->open) {
 644                         if (sp[i] & 0x01) {
 645                                 dbg("SP%d No Interrupt !!!", i);
 646                         } else {
 647                                 switch (sp[i] & 0x0f) {
 648                                 case SERIAL_IIR_RLS:
 649                                         dbg("Serial Port %d: Receiver status error or ", i);
 650                                         dbg("address bit detected in 9-bit mode");
 651                                         mos7840_port->MsrLsr = 1;
 652                                         wreg = LINE_STATUS_REGISTER;
 653                                         break;
 654                                 case SERIAL_IIR_MS:
 655                                         dbg("Serial Port %d: Modem status change", i);
 656                                         mos7840_port->MsrLsr = 0;
 657                                         wreg = MODEM_STATUS_REGISTER;
 658                                         break;
 659                                 }
 660                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 661                         }
 662                 }
 663         }
 664         if (!(rv < 0))
 665                 /* the completion handler for the control urb will resubmit */
 666                 return;
 667 exit:
 668         result = usb_submit_urb(urb, GFP_ATOMIC);
 669         if (result) {
 670                 dev_err(&urb->dev->dev,
 671                         "%s - Error %d submitting interrupt urb\n",
 672                         __func__, result);
 673         }
 674 }
 675
 676 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 677                                        const char *function)
 678 {
 679         if (!port) {
 680                 dbg("%s - port == NULL", function);
 681                 return -1;
 682         }
 683         if (!port->serial) {
 684                 dbg("%s - port->serial == NULL", function);
 685                 return -1;
 686         }
 687
 688         return 0;
 689 }
 690
 691 /* Inline functions to check the sanity of a pointer that is passed to us */
 692 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 693                                          const char *function)
 694 {
 695         if (!serial) {
 696                 dbg("%s - serial == NULL", function);
 697                 return -1;
 698         }
 699         if (!serial->type) {
 700                 dbg("%s - serial->type == NULL!", function);
 701                 return -1;
 702         }
 703
 704         return 0;
 705 }
 706
 707 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 708                                                  const char *function)
 709 {
 710         /* if no port was specified, or it fails a paranoia check */
 711         if (!port ||
 712             mos7840_port_paranoia_check(port, function) ||
 713             mos7840_serial_paranoia_check(port->serial, function)) {
 714                 /* then say that we don't have a valid usb_serial thing,
 715                  * which will end up genrating -ENODEV return values */
 716                 return NULL;
 717         }
 718
 719         return port->serial;
 720 }
 721
 722 /*****************************************************************************
 723  * mos7840_bulk_in_callback
 724  *      this is the callback function for when we have received data on the
 725  *      bulk in endpoint.
 726  *****************************************************************************/
 727
 728 static void mos7840_bulk_in_callback(struct urb *urb)
 729 {
 730         int retval;
 731         unsigned char *data;
 732         struct usb_serial *serial;
 733         struct usb_serial_port *port;
 734         struct moschip_port *mos7840_port;
 735         struct tty_struct *tty;
 736         int status = urb->status;
 737
 738         mos7840_port = urb->context;
 739         if (!mos7840_port) {
 740                 dbg("%s", "NULL mos7840_port pointer");
 741                 return;
 742         }
 743
 744         if (status) {
 745                 dbg("nonzero read bulk status received: %d", status);
 746                 mos7840_port->read_urb_busy = false;
 747                 return;
 748         }
 749
 750         port = (struct usb_serial_port *)mos7840_port->port;
 751         if (mos7840_port_paranoia_check(port, __func__)) {
 752                 dbg("%s", "Port Paranoia failed");
 753                 mos7840_port->read_urb_busy = false;
 754                 return;
 755         }
 756
 757         serial = mos7840_get_usb_serial(port, __func__);
 758         if (!serial) {
 759                 dbg("%s", "Bad serial pointer");
 760                 mos7840_port->read_urb_busy = false;
 761                 return;
 762         }
 763
 764         dbg("%s", "Entering... ");
 765
 766         data = urb->transfer_buffer;
 767
 768         dbg("%s", "Entering ...........");
 769
 770         if (urb->actual_length) {
 771                 tty = tty_port_tty_get(&mos7840_port->port->port);
 772                 if (tty) {
 773                         tty_insert_flip_string(tty, data, urb->actual_length);
 774                         dbg(" %s ", data);
 775                         tty_flip_buffer_push(tty);
 776                         tty_kref_put(tty);
 777                 }
 778                 mos7840_port->icount.rx += urb->actual_length;
 779                 smp_wmb();
 780                 dbg("mos7840_port->icount.rx is %d:",
 781                     mos7840_port->icount.rx);
 782         }
 783
 784         if (!mos7840_port->read_urb) {
 785                 dbg("%s", "URB KILLED !!!");
 786                 mos7840_port->read_urb_busy = false;
 787                 return;
 788         }
 789
 790
 791         mos7840_port->read_urb->dev = serial->dev;
 792
 793         mos7840_port->read_urb_busy = true;
 794         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 795
 796         if (retval) {
 797                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 798                 mos7840_port->read_urb_busy = false;
 799         }
 800 }
 801
 802 /*****************************************************************************
 803  * mos7840_bulk_out_data_callback
 804  *      this is the callback function for when we have finished sending
 805  *      serial data on the bulk out endpoint.
 806  *****************************************************************************/
 807
 808 static void mos7840_bulk_out_data_callback(struct urb *urb)
 809 {
 810         struct moschip_port *mos7840_port;
 811         struct tty_struct *tty;
 812         int status = urb->status;
 813         int i;
 814
 815         mos7840_port = urb->context;
 816         spin_lock(&mos7840_port->pool_lock);
 817         for (i = 0; i < NUM_URBS; i++) {
 818                 if (urb == mos7840_port->write_urb_pool[i]) {
 819                         mos7840_port->busy[i] = 0;
 820                         break;
 821                 }
 822         }
 823         spin_unlock(&mos7840_port->pool_lock);
 824
 825         if (status) {
 826                 dbg("nonzero write bulk status received:%d", status);
 827                 return;
 828         }
 829
 830         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 831                 dbg("%s", "Port Paranoia failed");
 832                 return;
 833         }
 834
 835         dbg("%s", "Entering .........");
 836
 837         tty = tty_port_tty_get(&mos7840_port->port->port);
 838         if (tty && mos7840_port->open)
 839                 tty_wakeup(tty);
 840         tty_kref_put(tty);
 841
 842 }
 843
 844 /************************************************************************/
 845 /*       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       */
 846 /************************************************************************/
 847 #ifdef MCSSerialProbe
 848 static int mos7840_serial_probe(struct usb_serial *serial,
 849                                 const struct usb_device_id *id)
 850 {
 851
 852         /*need to implement the mode_reg reading and updating\
 853            structures usb_serial_ device_type\
 854            (i.e num_ports, num_bulkin,bulkout etc) */
 855         /* Also we can update the changes  attach */
 856         return 1;
 857 }
 858 #endif
 859
 860 /*****************************************************************************
 861  * mos7840_open
 862  *      this function is called by the tty driver when a port is opened
 863  *      If successful, we return 0
 864  *      Otherwise we return a negative error number.
 865  *****************************************************************************/
 866
 867 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 868 {
 869         int response;
 870         int j;
 871         struct usb_serial *serial;
 872         struct urb *urb;
 873         __u16 Data;
 874         int status;
 875         struct moschip_port *mos7840_port;
 876         struct moschip_port *port0;
 877
 878         dbg ("%s enter", __func__);
 879
 880         if (mos7840_port_paranoia_check(port, __func__)) {
 881                 dbg("%s", "Port Paranoia failed");
 882                 return -ENODEV;
 883         }
 884
 885         serial = port->serial;
 886
 887         if (mos7840_serial_paranoia_check(serial, __func__)) {
 888                 dbg("%s", "Serial Paranoia failed");
 889                 return -ENODEV;
 890         }
 891
 892         mos7840_port = mos7840_get_port_private(port);
 893         port0 = mos7840_get_port_private(serial->port[0]);
 894
 895         if (mos7840_port == NULL || port0 == NULL)
 896                 return -ENODEV;
 897
 898         usb_clear_halt(serial->dev, port->write_urb->pipe);
 899         usb_clear_halt(serial->dev, port->read_urb->pipe);
 900         port0->open_ports++;
 901
 902         /* Initialising the write urb pool */
 903         for (j = 0; j < NUM_URBS; ++j) {
 904                 urb = usb_alloc_urb(0, GFP_KERNEL);
 905                 mos7840_port->write_urb_pool[j] = urb;
 906
 907                 if (urb == NULL) {
 908                         dev_err(&port->dev, "No more urbs???\n");
 909                         continue;
 910                 }
 911
 912                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 913                                                                 GFP_KERNEL);
 914                 if (!urb->transfer_buffer) {
 915                         usb_free_urb(urb);
 916                         mos7840_port->write_urb_pool[j] = NULL;
 917                         dev_err(&port->dev,
 918                                 "%s-out of memory for urb buffers.\n",
 919                                 __func__);
 920                         continue;
 921                 }
 922         }
 923
 924 /*****************************************************************************
 925  * Initialize MCS7840 -- Write Init values to corresponding Registers
 926  *
 927  * Register Index
 928  * 1 : IER
 929  * 2 : FCR
 930  * 3 : LCR
 931  * 4 : MCR
 932  *
 933  * 0x08 : SP1/2 Control Reg
 934  *****************************************************************************/
 935
 936         /* NEED to check the following Block */
 937
 938         Data = 0x0;
 939         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 940         if (status < 0) {
 941                 dbg("Reading Spreg failed");
 942                 goto err;
 943         }
 944         Data |= 0x80;
 945         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 946         if (status < 0) {
 947                 dbg("writing Spreg failed");
 948                 goto err;
 949         }
 950
 951         Data &= ~0x80;
 952         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 953         if (status < 0) {
 954                 dbg("writing Spreg failed");
 955                 goto err;
 956         }
 957         /* End of block to be checked */
 958
 959         Data = 0x0;
 960         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 961                                                                         &Data);
 962         if (status < 0) {
 963                 dbg("Reading Controlreg failed");
 964                 goto err;
 965         }
 966         Data |= 0x08;           /* Driver done bit */
 967         Data |= 0x20;           /* rx_disable */
 968         status = mos7840_set_reg_sync(port,
 969                                 mos7840_port->ControlRegOffset, Data);
 970         if (status < 0) {
 971                 dbg("writing Controlreg failed");
 972                 goto err;
 973         }
 974         /* do register settings here */
 975         /* Set all regs to the device default values. */
 976         /***********************************
 977          * First Disable all interrupts.
 978          ***********************************/
 979         Data = 0x00;
 980         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 981         if (status < 0) {
 982                 dbg("disabling interrupts failed");
 983                 goto err;
 984         }
 985         /* Set FIFO_CONTROL_REGISTER to the default value */
 986         Data = 0x00;
 987         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 988         if (status < 0) {
 989                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 990                 goto err;
 991         }
 992
 993         Data = 0xcf;
 994         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 995         if (status < 0) {
 996                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
 997                 goto err;
 998         }
 999
1000         Data = 0x03;
1001         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1002         mos7840_port->shadowLCR = Data;
1003
1004         Data = 0x0b;
1005         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1006         mos7840_port->shadowMCR = Data;
1007
1008         Data = 0x00;
1009         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1010         mos7840_port->shadowLCR = Data;
1011
1012         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1013         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1014
1015         Data = 0x0c;
1016         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1017
1018         Data = 0x0;
1019         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1020
1021         Data = 0x00;
1022         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1023
1024         Data = Data & ~SERIAL_LCR_DLAB;
1025         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1026         mos7840_port->shadowLCR = Data;
1027
1028         /* clearing Bulkin and Bulkout Fifo */
1029         Data = 0x0;
1030         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1031
1032         Data = Data | 0x0c;
1033         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1034
1035         Data = Data & ~0x0c;
1036         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1037         /* Finally enable all interrupts */
1038         Data = 0x0c;
1039         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1040
1041         /* clearing rx_disable */
1042         Data = 0x0;
1043         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1044                                                                         &Data);
1045         Data = Data & ~0x20;
1046         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1047                                                                         Data);
1048
1049         /* rx_negate */
1050         Data = 0x0;
1051         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1052                                                                         &Data);
1053         Data = Data | 0x10;
1054         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1055                                                                         Data);
1056
1057         /* Check to see if we've set up our endpoint info yet    *
1058          * (can't set it up in mos7840_startup as the structures *
1059          * were not set up at that time.)                        */
1060         if (port0->open_ports == 1) {
1061                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1062                         /* set up interrupt urb */
1063                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1064                                 serial->dev,
1065                                 usb_rcvintpipe(serial->dev,
1066                                 serial->port[0]->interrupt_in_endpointAddress),
1067                                 serial->port[0]->interrupt_in_buffer,
1068                                 serial->port[0]->interrupt_in_urb->
1069                                 transfer_buffer_length,
1070                                 mos7840_interrupt_callback,
1071                                 serial,
1072                                 serial->port[0]->interrupt_in_urb->interval);
1073
1074                         /* start interrupt read for mos7840               *
1075                          * will continue as long as mos7840 is connected  */
1076
1077                         response =
1078                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1079                                            GFP_KERNEL);
1080                         if (response) {
1081                                 dev_err(&port->dev, "%s - Error %d submitting "
1082                                         "interrupt urb\n", __func__, response);
1083                         }
1084
1085                 }
1086
1087         }
1088
1089         /* see if we've set up our endpoint info yet   *
1090          * (can't set it up in mos7840_startup as the  *
1091          * structures were not set up at that time.)   */
1092
1093         dbg("port number is %d", port->number);
1094         dbg("serial number is %d", port->serial->minor);
1095         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1096         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1097         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1098         dbg("port's number in the device is %d", mos7840_port->port_num);
1099         mos7840_port->read_urb = port->read_urb;
1100
1101         /* set up our bulk in urb */
1102         if ((serial->num_ports == 2)
1103                 && ((((__u16)port->number -
1104                         (__u16)(port->serial->minor)) % 2) != 0)) {
1105                 usb_fill_bulk_urb(mos7840_port->read_urb,
1106                         serial->dev,
1107                         usb_rcvbulkpipe(serial->dev,
1108                                 (port->bulk_in_endpointAddress) + 2),
1109                         port->bulk_in_buffer,
1110                         mos7840_port->read_urb->transfer_buffer_length,
1111                         mos7840_bulk_in_callback, mos7840_port);
1112         } else {
1113                 usb_fill_bulk_urb(mos7840_port->read_urb,
1114                         serial->dev,
1115                         usb_rcvbulkpipe(serial->dev,
1116                                 port->bulk_in_endpointAddress),
1117                         port->bulk_in_buffer,
1118                         mos7840_port->read_urb->transfer_buffer_length,
1119                         mos7840_bulk_in_callback, mos7840_port);
1120         }
1121
1122         dbg("mos7840_open: bulkin endpoint is %d",
1123             port->bulk_in_endpointAddress);
1124         mos7840_port->read_urb_busy = true;
1125         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1126         if (response) {
1127                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1128                         __func__, response);
1129                 mos7840_port->read_urb_busy = false;
1130         }
1131
1132         /* initialize our wait queues */
1133         init_waitqueue_head(&mos7840_port->wait_chase);
1134
1135         /* initialize our icount structure */
1136         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1137
1138         /* initialize our port settings */
1139         /* Must set to enable ints! */
1140         mos7840_port->shadowMCR = MCR_MASTER_IE;
1141         /* send a open port command */
1142         mos7840_port->open = 1;
1143         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1144         mos7840_port->icount.tx = 0;
1145         mos7840_port->icount.rx = 0;
1146
1147         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1148                                 serial, mos7840_port, port);
1149
1150         dbg ("%s leave", __func__);
1151
1152         return 0;
1153 err:
1154         for (j = 0; j < NUM_URBS; ++j) {
1155                 urb = mos7840_port->write_urb_pool[j];
1156                 if (!urb)
1157                         continue;
1158                 kfree(urb->transfer_buffer);
1159                 usb_free_urb(urb);
1160         }
1161         return status;
1162 }
1163
1164 /*****************************************************************************
1165  * mos7840_chars_in_buffer
1166  *      this function is called by the tty driver when it wants to know how many
1167  *      bytes of data we currently have outstanding in the port (data that has
1168  *      been written, but hasn't made it out the port yet)
1169  *      If successful, we return the number of bytes left to be written in the
1170  *      system,
1171  *      Otherwise we return zero.
1172  *****************************************************************************/
1173
1174 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1175 {
1176         struct usb_serial_port *port = tty->driver_data;
1177         int i;
1178         int chars = 0;
1179         unsigned long flags;
1180         struct moschip_port *mos7840_port;
1181
1182         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1183
1184         if (mos7840_port_paranoia_check(port, __func__)) {
1185                 dbg("%s", "Invalid port");
1186                 return 0;
1187         }
1188
1189         mos7840_port = mos7840_get_port_private(port);
1190         if (mos7840_port == NULL) {
1191                 dbg("%s", "mos7840_break:leaving ...........");
1192                 return 0;
1193         }
1194
1195         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1196         for (i = 0; i < NUM_URBS; ++i) {
1197                 if (mos7840_port->busy[i]) {
1198                         struct urb *urb = mos7840_port->write_urb_pool[i];
1199                         chars += urb->transfer_buffer_length;
1200                 }
1201         }
1202         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1203         dbg("%s - returns %d", __func__, chars);
1204         return chars;
1205
1206 }
1207
1208 /*****************************************************************************
1209  * mos7840_close
1210  *      this function is called by the tty driver when a port is closed
1211  *****************************************************************************/
1212
1213 static void mos7840_close(struct usb_serial_port *port)
1214 {
1215         struct usb_serial *serial;
1216         struct moschip_port *mos7840_port;
1217         struct moschip_port *port0;
1218         int j;
1219         __u16 Data;
1220
1221         dbg("%s", "mos7840_close:entering...");
1222
1223         if (mos7840_port_paranoia_check(port, __func__)) {
1224                 dbg("%s", "Port Paranoia failed");
1225                 return;
1226         }
1227
1228         serial = mos7840_get_usb_serial(port, __func__);
1229         if (!serial) {
1230                 dbg("%s", "Serial Paranoia failed");
1231                 return;
1232         }
1233
1234         mos7840_port = mos7840_get_port_private(port);
1235         port0 = mos7840_get_port_private(serial->port[0]);
1236
1237         if (mos7840_port == NULL || port0 == NULL)
1238                 return;
1239
1240         for (j = 0; j < NUM_URBS; ++j)
1241                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1242
1243         /* Freeing Write URBs */
1244         for (j = 0; j < NUM_URBS; ++j) {
1245                 if (mos7840_port->write_urb_pool[j]) {
1246                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1247                                 kfree(mos7840_port->write_urb_pool[j]->
1248                                       transfer_buffer);
1249
1250                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1251                 }
1252         }
1253
1254         /* While closing port, shutdown all bulk read, write  *
1255          * and interrupt read if they exists                  */
1256         if (serial->dev) {
1257                 if (mos7840_port->write_urb) {
1258                         dbg("%s", "Shutdown bulk write");
1259                         usb_kill_urb(mos7840_port->write_urb);
1260                 }
1261                 if (mos7840_port->read_urb) {
1262                         dbg("%s", "Shutdown bulk read");
1263                         usb_kill_urb(mos7840_port->read_urb);
1264                         mos7840_port->read_urb_busy = false;
1265                 }
1266                 if ((&mos7840_port->control_urb)) {
1267                         dbg("%s", "Shutdown control read");
1268                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1269                 }
1270         }
1271 /*      if(mos7840_port->ctrl_buf != NULL) */
1272 /*              kfree(mos7840_port->ctrl_buf); */
1273         port0->open_ports--;
1274         dbg("mos7840_num_open_ports in close%d:in port%d",
1275             port0->open_ports, port->number);
1276         if (port0->open_ports == 0) {
1277                 if (serial->port[0]->interrupt_in_urb) {
1278                         dbg("%s", "Shutdown interrupt_in_urb");
1279                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1280                 }
1281         }
1282
1283         if (mos7840_port->write_urb) {
1284                 /* if this urb had a transfer buffer already (old tx) free it */
1285                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1286                         kfree(mos7840_port->write_urb->transfer_buffer);
1287                 usb_free_urb(mos7840_port->write_urb);
1288         }
1289
1290         Data = 0x0;
1291         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1292
1293         Data = 0x00;
1294         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1295
1296         mos7840_port->open = 0;
1297
1298         dbg("%s", "Leaving ............");
1299 }
1300
1301 /************************************************************************
1302  *
1303  * mos7840_block_until_chase_response
1304  *
1305  *      This function will block the close until one of the following:
1306  *              1. Response to our Chase comes from mos7840
1307  *              2. A timeout of 10 seconds without activity has expired
1308  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1309  *
1310  ************************************************************************/
1311
1312 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1313                                         struct moschip_port *mos7840_port)
1314 {
1315         int timeout = 1 * HZ;
1316         int wait = 10;
1317         int count;
1318
1319         while (1) {
1320                 count = mos7840_chars_in_buffer(tty);
1321
1322                 /* Check for Buffer status */
1323                 if (count <= 0)
1324                         return;
1325
1326                 /* Block the thread for a while */
1327                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1328                                                timeout);
1329                 /* No activity.. count down section */
1330                 wait--;
1331                 if (wait == 0) {
1332                         dbg("%s - TIMEOUT", __func__);
1333                         return;
1334                 } else {
1335                         /* Reset timeout value back to seconds */
1336                         wait = 10;
1337                 }
1338         }
1339
1340 }
1341
1342 /*****************************************************************************
1343  * mos7840_break
1344  *      this function sends a break to the port
1345  *****************************************************************************/
1346 static void mos7840_break(struct tty_struct *tty, int break_state)
1347 {
1348         struct usb_serial_port *port = tty->driver_data;
1349         unsigned char data;
1350         struct usb_serial *serial;
1351         struct moschip_port *mos7840_port;
1352
1353         dbg("%s", "Entering ...........");
1354         dbg("mos7840_break: Start");
1355
1356         if (mos7840_port_paranoia_check(port, __func__)) {
1357                 dbg("%s", "Port Paranoia failed");
1358                 return;
1359         }
1360
1361         serial = mos7840_get_usb_serial(port, __func__);
1362         if (!serial) {
1363                 dbg("%s", "Serial Paranoia failed");
1364                 return;
1365         }
1366
1367         mos7840_port = mos7840_get_port_private(port);
1368
1369         if (mos7840_port == NULL)
1370                 return;
1371
1372         if (serial->dev)
1373                 /* flush and block until tx is empty */
1374                 mos7840_block_until_chase_response(tty, mos7840_port);
1375
1376         if (break_state == -1)
1377                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1378         else
1379                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1380
1381         /* FIXME: no locking on shadowLCR anywhere in driver */
1382         mos7840_port->shadowLCR = data;
1383         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1384             mos7840_port->shadowLCR);
1385         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1386                              mos7840_port->shadowLCR);
1387 }
1388
1389 /*****************************************************************************
1390  * mos7840_write_room
1391  *      this function is called by the tty driver when it wants to know how many
1392  *      bytes of data we can accept for a specific port.
1393  *      If successful, we return the amount of room that we have for this port
1394  *      Otherwise we return a negative error number.
1395  *****************************************************************************/
1396
1397 static int mos7840_write_room(struct tty_struct *tty)
1398 {
1399         struct usb_serial_port *port = tty->driver_data;
1400         int i;
1401         int room = 0;
1402         unsigned long flags;
1403         struct moschip_port *mos7840_port;
1404
1405         dbg("%s", " mos7840_write_room:entering ...........");
1406
1407         if (mos7840_port_paranoia_check(port, __func__)) {
1408                 dbg("%s", "Invalid port");
1409                 dbg("%s", " mos7840_write_room:leaving ...........");
1410                 return -1;
1411         }
1412
1413         mos7840_port = mos7840_get_port_private(port);
1414         if (mos7840_port == NULL) {
1415                 dbg("%s", "mos7840_break:leaving ...........");
1416                 return -1;
1417         }
1418
1419         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1420         for (i = 0; i < NUM_URBS; ++i) {
1421                 if (!mos7840_port->busy[i])
1422                         room += URB_TRANSFER_BUFFER_SIZE;
1423         }
1424         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1425
1426         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1427         dbg("%s - returns %d", __func__, room);
1428         return room;
1429
1430 }
1431
1432 /*****************************************************************************
1433  * mos7840_write
1434  *      this function is called by the tty driver when data should be written to
1435  *      the port.
1436  *      If successful, we return the number of bytes written, otherwise we
1437  *      return a negative error number.
1438  *****************************************************************************/
1439
1440 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1441                          const unsigned char *data, int count)
1442 {
1443         int status;
1444         int i;
1445         int bytes_sent = 0;
1446         int transfer_size;
1447         unsigned long flags;
1448
1449         struct moschip_port *mos7840_port;
1450         struct usb_serial *serial;
1451         struct urb *urb;
1452         /* __u16 Data; */
1453         const unsigned char *current_position = data;
1454         unsigned char *data1;
1455         dbg("%s", "entering ...........");
1456         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1457                                         mos7840_port->shadowLCR); */
1458
1459 #ifdef NOTMOS7840
1460         Data = 0x00;
1461         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1462         mos7840_port->shadowLCR = Data;
1463         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1464         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1465             mos7840_port->shadowLCR);
1466
1467         /* Data = 0x03; */
1468         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1469         /* mos7840_port->shadowLCR=Data;//Need to add later */
1470
1471         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1472         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1473
1474         /* Data = 0x0c; */
1475         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1476         Data = 0x00;
1477         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1478         dbg("mos7840_write:DLL value is %x", Data);
1479
1480         Data = 0x0;
1481         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1482         dbg("mos7840_write:DLM value is %x", Data);
1483
1484         Data = Data & ~SERIAL_LCR_DLAB;
1485         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1486             mos7840_port->shadowLCR);
1487         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1488 #endif
1489
1490         if (mos7840_port_paranoia_check(port, __func__)) {
1491                 dbg("%s", "Port Paranoia failed");
1492                 return -1;
1493         }
1494
1495         serial = port->serial;
1496         if (mos7840_serial_paranoia_check(serial, __func__)) {
1497                 dbg("%s", "Serial Paranoia failed");
1498                 return -1;
1499         }
1500
1501         mos7840_port = mos7840_get_port_private(port);
1502         if (mos7840_port == NULL) {
1503                 dbg("%s", "mos7840_port is NULL");
1504                 return -1;
1505         }
1506
1507         /* try to find a free urb in the list */
1508         urb = NULL;
1509
1510         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1511         for (i = 0; i < NUM_URBS; ++i) {
1512                 if (!mos7840_port->busy[i]) {
1513                         mos7840_port->busy[i] = 1;
1514                         urb = mos7840_port->write_urb_pool[i];
1515                         dbg("URB:%d", i);
1516                         break;
1517                 }
1518         }
1519         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1520
1521         if (urb == NULL) {
1522                 dbg("%s - no more free urbs", __func__);
1523                 goto exit;
1524         }
1525
1526         if (urb->transfer_buffer == NULL) {
1527                 urb->transfer_buffer =
1528                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1529
1530                 if (urb->transfer_buffer == NULL) {
1531                         dev_err(&port->dev, "%s no more kernel memory...\n",
1532                                 __func__);
1533                         goto exit;
1534                 }
1535         }
1536         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1537
1538         memcpy(urb->transfer_buffer, current_position, transfer_size);
1539
1540         /* fill urb with data and submit  */
1541         if ((serial->num_ports == 2)
1542                 && ((((__u16)port->number -
1543                         (__u16)(port->serial->minor)) % 2) != 0)) {
1544                 usb_fill_bulk_urb(urb,
1545                         serial->dev,
1546                         usb_sndbulkpipe(serial->dev,
1547                                 (port->bulk_out_endpointAddress) + 2),
1548                         urb->transfer_buffer,
1549                         transfer_size,
1550                         mos7840_bulk_out_data_callback, mos7840_port);
1551         } else {
1552                 usb_fill_bulk_urb(urb,
1553                         serial->dev,
1554                         usb_sndbulkpipe(serial->dev,
1555                                 port->bulk_out_endpointAddress),
1556                         urb->transfer_buffer,
1557                         transfer_size,
1558                         mos7840_bulk_out_data_callback, mos7840_port);
1559         }
1560
1561         data1 = urb->transfer_buffer;
1562         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1563
1564         /* send it down the pipe */
1565         status = usb_submit_urb(urb, GFP_ATOMIC);
1566
1567         if (status) {
1568                 mos7840_port->busy[i] = 0;
1569                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1570                         "with status = %d\n", __func__, status);
1571                 bytes_sent = status;
1572                 goto exit;
1573         }
1574         bytes_sent = transfer_size;
1575         mos7840_port->icount.tx += transfer_size;
1576         smp_wmb();
1577         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1578 exit:
1579         return bytes_sent;
1580
1581 }
1582
1583 /*****************************************************************************
1584  * mos7840_throttle
1585  *      this function is called by the tty driver when it wants to stop the data
1586  *      being read from the port.
1587  *****************************************************************************/
1588
1589 static void mos7840_throttle(struct tty_struct *tty)
1590 {
1591         struct usb_serial_port *port = tty->driver_data;
1592         struct moschip_port *mos7840_port;
1593         int status;
1594
1595         if (mos7840_port_paranoia_check(port, __func__)) {
1596                 dbg("%s", "Invalid port");
1597                 return;
1598         }
1599
1600         dbg("- port %d", port->number);
1601
1602         mos7840_port = mos7840_get_port_private(port);
1603
1604         if (mos7840_port == NULL)
1605                 return;
1606
1607         if (!mos7840_port->open) {
1608                 dbg("%s", "port not opened");
1609                 return;
1610         }
1611
1612         dbg("%s", "Entering ..........");
1613
1614         /* if we are implementing XON/XOFF, send the stop character */
1615         if (I_IXOFF(tty)) {
1616                 unsigned char stop_char = STOP_CHAR(tty);
1617                 status = mos7840_write(tty, port, &stop_char, 1);
1618                 if (status <= 0)
1619                         return;
1620         }
1621         /* if we are implementing RTS/CTS, toggle that line */
1622         if (tty->termios->c_cflag & CRTSCTS) {
1623                 mos7840_port->shadowMCR &= ~MCR_RTS;
1624                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1625                                          mos7840_port->shadowMCR);
1626                 if (status < 0)
1627                         return;
1628         }
1629 }
1630
1631 /*****************************************************************************
1632  * mos7840_unthrottle
1633  *      this function is called by the tty driver when it wants to resume
1634  *      the data being read from the port (called after mos7840_throttle is
1635  *      called)
1636  *****************************************************************************/
1637 static void mos7840_unthrottle(struct tty_struct *tty)
1638 {
1639         struct usb_serial_port *port = tty->driver_data;
1640         int status;
1641         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1642
1643         if (mos7840_port_paranoia_check(port, __func__)) {
1644                 dbg("%s", "Invalid port");
1645                 return;
1646         }
1647
1648         if (mos7840_port == NULL)
1649                 return;
1650
1651         if (!mos7840_port->open) {
1652                 dbg("%s - port not opened", __func__);
1653                 return;
1654         }
1655
1656         dbg("%s", "Entering ..........");
1657
1658         /* if we are implementing XON/XOFF, send the start character */
1659         if (I_IXOFF(tty)) {
1660                 unsigned char start_char = START_CHAR(tty);
1661                 status = mos7840_write(tty, port, &start_char, 1);
1662                 if (status <= 0)
1663                         return;
1664         }
1665
1666         /* if we are implementing RTS/CTS, toggle that line */
1667         if (tty->termios->c_cflag & CRTSCTS) {
1668                 mos7840_port->shadowMCR |= MCR_RTS;
1669                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1670                                          mos7840_port->shadowMCR);
1671                 if (status < 0)
1672                         return;
1673         }
1674 }
1675
1676 static int mos7840_tiocmget(struct tty_struct *tty)
1677 {
1678         struct usb_serial_port *port = tty->driver_data;
1679         struct moschip_port *mos7840_port;
1680         unsigned int result;
1681         __u16 msr;
1682         __u16 mcr;
1683         int status;
1684         mos7840_port = mos7840_get_port_private(port);
1685
1686         dbg("%s - port %d", __func__, port->number);
1687
1688         if (mos7840_port == NULL)
1689                 return -ENODEV;
1690
1691         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1692         if (status != 1)
1693                 return -EIO;
1694         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1695         if (status != 1)
1696                 return -EIO;
1697         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1698             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1699             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1700             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1701             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1702             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1703             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1704
1705         dbg("%s - 0x%04X", __func__, result);
1706
1707         return result;
1708 }
1709
1710 static int mos7840_tiocmset(struct tty_struct *tty,
1711                             unsigned int set, unsigned int clear)
1712 {
1713         struct usb_serial_port *port = tty->driver_data;
1714         struct moschip_port *mos7840_port;
1715         unsigned int mcr;
1716         int status;
1717
1718         dbg("%s - port %d", __func__, port->number);
1719
1720         mos7840_port = mos7840_get_port_private(port);
1721
1722         if (mos7840_port == NULL)
1723                 return -ENODEV;
1724
1725         /* FIXME: What locks the port registers ? */
1726         mcr = mos7840_port->shadowMCR;
1727         if (clear & TIOCM_RTS)
1728                 mcr &= ~MCR_RTS;
1729         if (clear & TIOCM_DTR)
1730                 mcr &= ~MCR_DTR;
1731         if (clear & TIOCM_LOOP)
1732                 mcr &= ~MCR_LOOPBACK;
1733
1734         if (set & TIOCM_RTS)
1735                 mcr |= MCR_RTS;
1736         if (set & TIOCM_DTR)
1737                 mcr |= MCR_DTR;
1738         if (set & TIOCM_LOOP)
1739                 mcr |= MCR_LOOPBACK;
1740
1741         mos7840_port->shadowMCR = mcr;
1742
1743         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1744         if (status < 0) {
1745                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1746                 return status;
1747         }
1748
1749         return 0;
1750 }
1751
1752 /*****************************************************************************
1753  * mos7840_calc_baud_rate_divisor
1754  *      this function calculates the proper baud rate divisor for the specified
1755  *      baud rate.
1756  *****************************************************************************/
1757 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1758                                           __u16 *clk_sel_val)
1759 {
1760
1761         dbg("%s - %d", __func__, baudRate);
1762
1763         if (baudRate <= 115200) {
1764                 *divisor = 115200 / baudRate;
1765                 *clk_sel_val = 0x0;
1766         }
1767         if ((baudRate > 115200) && (baudRate <= 230400)) {
1768                 *divisor = 230400 / baudRate;
1769                 *clk_sel_val = 0x10;
1770         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1771                 *divisor = 403200 / baudRate;
1772                 *clk_sel_val = 0x20;
1773         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1774                 *divisor = 460800 / baudRate;
1775                 *clk_sel_val = 0x30;
1776         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1777                 *divisor = 806400 / baudRate;
1778                 *clk_sel_val = 0x40;
1779         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1780                 *divisor = 921600 / baudRate;
1781                 *clk_sel_val = 0x50;
1782         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1783                 *divisor = 1572864 / baudRate;
1784                 *clk_sel_val = 0x60;
1785         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1786                 *divisor = 3145728 / baudRate;
1787                 *clk_sel_val = 0x70;
1788         }
1789         return 0;
1790
1791 #ifdef NOTMCS7840
1792
1793         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1794                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1795                         *divisor = mos7840_divisor_table[i].Divisor;
1796                         return 0;
1797                 }
1798         }
1799
1800         /* After trying for all the standard baud rates    *
1801          * Try calculating the divisor for this baud rate  */
1802
1803         if (baudrate > 75 && baudrate < 230400) {
1804                 /* get the divisor */
1805                 custom = (__u16) (230400L / baudrate);
1806
1807                 /* Check for round off */
1808                 round1 = (__u16) (2304000L / baudrate);
1809                 round = (__u16) (round1 - (custom * 10));
1810                 if (round > 4)
1811                         custom++;
1812                 *divisor = custom;
1813
1814                 dbg(" Baud %d = %d", baudrate, custom);
1815                 return 0;
1816         }
1817
1818         dbg("%s", " Baud calculation Failed...");
1819         return -1;
1820 #endif
1821 }
1822
1823 /*****************************************************************************
1824  * mos7840_send_cmd_write_baud_rate
1825  *      this function sends the proper command to change the baud rate of the
1826  *      specified port.
1827  *****************************************************************************/
1828
1829 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1830                                             int baudRate)
1831 {
1832         int divisor = 0;
1833         int status;
1834         __u16 Data;
1835         unsigned char number;
1836         __u16 clk_sel_val;
1837         struct usb_serial_port *port;
1838
1839         if (mos7840_port == NULL)
1840                 return -1;
1841
1842         port = (struct usb_serial_port *)mos7840_port->port;
1843         if (mos7840_port_paranoia_check(port, __func__)) {
1844                 dbg("%s", "Invalid port");
1845                 return -1;
1846         }
1847
1848         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1849                 dbg("%s", "Invalid Serial");
1850                 return -1;
1851         }
1852
1853         dbg("%s", "Entering ..........");
1854
1855         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1856
1857         dbg("%s - port = %d, baud = %d", __func__,
1858             mos7840_port->port->number, baudRate);
1859         /* reset clk_uart_sel in spregOffset */
1860         if (baudRate > 115200) {
1861 #ifdef HW_flow_control
1862                 /* NOTE: need to see the pther register to modify */
1863                 /* setting h/w flow control bit to 1 */
1864                 Data = 0x2b;
1865                 mos7840_port->shadowMCR = Data;
1866                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1867                                                                         Data);
1868                 if (status < 0) {
1869                         dbg("Writing spreg failed in set_serial_baud");
1870                         return -1;
1871                 }
1872 #endif
1873
1874         } else {
1875 #ifdef HW_flow_control
1876                 /* setting h/w flow control bit to 0 */
1877                 Data = 0xb;
1878                 mos7840_port->shadowMCR = Data;
1879                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1880                                                                         Data);
1881                 if (status < 0) {
1882                         dbg("Writing spreg failed in set_serial_baud");
1883                         return -1;
1884                 }
1885 #endif
1886
1887         }
1888
1889         if (1) {                /* baudRate <= 115200) */
1890                 clk_sel_val = 0x0;
1891                 Data = 0x0;
1892                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1893                                                    &clk_sel_val);
1894                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1895                                                                  &Data);
1896                 if (status < 0) {
1897                         dbg("reading spreg failed in set_serial_baud");
1898                         return -1;
1899                 }
1900                 Data = (Data & 0x8f) | clk_sel_val;
1901                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1902                                                                 Data);
1903                 if (status < 0) {
1904                         dbg("Writing spreg failed in set_serial_baud");
1905                         return -1;
1906                 }
1907                 /* Calculate the Divisor */
1908
1909                 if (status) {
1910                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1911                         return status;
1912                 }
1913                 /* Enable access to divisor latch */
1914                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1915                 mos7840_port->shadowLCR = Data;
1916                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1917
1918                 /* Write the divisor */
1919                 Data = (unsigned char)(divisor & 0xff);
1920                 dbg("set_serial_baud Value to write DLL is %x", Data);
1921                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1922
1923                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1924                 dbg("set_serial_baud Value to write DLM is %x", Data);
1925                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1926
1927                 /* Disable access to divisor latch */
1928                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1929                 mos7840_port->shadowLCR = Data;
1930                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1931
1932         }
1933         return status;
1934 }
1935
1936 /*****************************************************************************
1937  * mos7840_change_port_settings
1938  *      This routine is called to set the UART on the device to match
1939  *      the specified new settings.
1940  *****************************************************************************/
1941
1942 static void mos7840_change_port_settings(struct tty_struct *tty,
1943         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1944 {
1945         int baud;
1946         unsigned cflag;
1947         unsigned iflag;
1948         __u8 lData;
1949         __u8 lParity;
1950         __u8 lStop;
1951         int status;
1952         __u16 Data;
1953         struct usb_serial_port *port;
1954         struct usb_serial *serial;
1955
1956         if (mos7840_port == NULL)
1957                 return;
1958
1959         port = (struct usb_serial_port *)mos7840_port->port;
1960
1961         if (mos7840_port_paranoia_check(port, __func__)) {
1962                 dbg("%s", "Invalid port");
1963                 return;
1964         }
1965
1966         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1967                 dbg("%s", "Invalid Serial");
1968                 return;
1969         }
1970
1971         serial = port->serial;
1972
1973         dbg("%s - port %d", __func__, mos7840_port->port->number);
1974
1975         if (!mos7840_port->open) {
1976                 dbg("%s - port not opened", __func__);
1977                 return;
1978         }
1979
1980         dbg("%s", "Entering ..........");
1981
1982         lData = LCR_BITS_8;
1983         lStop = LCR_STOP_1;
1984         lParity = LCR_PAR_NONE;
1985
1986         cflag = tty->termios->c_cflag;
1987         iflag = tty->termios->c_iflag;
1988
1989         /* Change the number of bits */
1990         switch (cflag & CSIZE) {
1991         case CS5:
1992                 lData = LCR_BITS_5;
1993                 break;
1994
1995         case CS6:
1996                 lData = LCR_BITS_6;
1997                 break;
1998
1999         case CS7:
2000                 lData = LCR_BITS_7;
2001                 break;
2002
2003         default:
2004         case CS8:
2005                 lData = LCR_BITS_8;
2006                 break;
2007         }
2008
2009         /* Change the Parity bit */
2010         if (cflag & PARENB) {
2011                 if (cflag & PARODD) {
2012                         lParity = LCR_PAR_ODD;
2013                         dbg("%s - parity = odd", __func__);
2014                 } else {
2015                         lParity = LCR_PAR_EVEN;
2016                         dbg("%s - parity = even", __func__);
2017                 }
2018
2019         } else {
2020                 dbg("%s - parity = none", __func__);
2021         }
2022
2023         if (cflag & CMSPAR)
2024                 lParity = lParity | 0x20;
2025
2026         /* Change the Stop bit */
2027         if (cflag & CSTOPB) {
2028                 lStop = LCR_STOP_2;
2029                 dbg("%s - stop bits = 2", __func__);
2030         } else {
2031                 lStop = LCR_STOP_1;
2032                 dbg("%s - stop bits = 1", __func__);
2033         }
2034
2035         /* Update the LCR with the correct value */
2036         mos7840_port->shadowLCR &=
2037             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2038         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2039
2040         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2041             mos7840_port->shadowLCR);
2042         /* Disable Interrupts */
2043         Data = 0x00;
2044         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2045
2046         Data = 0x00;
2047         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2048
2049         Data = 0xcf;
2050         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2051
2052         /* Send the updated LCR value to the mos7840 */
2053         Data = mos7840_port->shadowLCR;
2054
2055         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2056
2057         Data = 0x00b;
2058         mos7840_port->shadowMCR = Data;
2059         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2060         Data = 0x00b;
2061         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2062
2063         /* set up the MCR register and send it to the mos7840 */
2064
2065         mos7840_port->shadowMCR = MCR_MASTER_IE;
2066         if (cflag & CBAUD)
2067                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2068
2069         if (cflag & CRTSCTS)
2070                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2071         else
2072                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2073
2074         Data = mos7840_port->shadowMCR;
2075         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2076
2077         /* Determine divisor based on baud rate */
2078         baud = tty_get_baud_rate(tty);
2079
2080         if (!baud) {
2081                 /* pick a default, any default... */
2082                 dbg("%s", "Picked default baud...");
2083                 baud = 9600;
2084         }
2085
2086         dbg("%s - baud rate = %d", __func__, baud);
2087         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2088
2089         /* Enable Interrupts */
2090         Data = 0x0c;
2091         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2092
2093         if (mos7840_port->read_urb_busy == false) {
2094                 mos7840_port->read_urb->dev = serial->dev;
2095                 mos7840_port->read_urb_busy = true;
2096                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2097                 if (status) {
2098                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2099                             status);
2100                         mos7840_port->read_urb_busy = false;
2101                 }
2102         }
2103         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2104             mos7840_port->shadowLCR);
2105 }
2106
2107 /*****************************************************************************
2108  * mos7840_set_termios
2109  *      this function is called by the tty driver when it wants to change
2110  *      the termios structure
2111  *****************************************************************************/
2112
2113 static void mos7840_set_termios(struct tty_struct *tty,
2114                                 struct usb_serial_port *port,
2115                                 struct ktermios *old_termios)
2116 {
2117         int status;
2118         unsigned int cflag;
2119         struct usb_serial *serial;
2120         struct moschip_port *mos7840_port;
2121         dbg("mos7840_set_termios: START");
2122         if (mos7840_port_paranoia_check(port, __func__)) {
2123                 dbg("%s", "Invalid port");
2124                 return;
2125         }
2126
2127         serial = port->serial;
2128
2129         if (mos7840_serial_paranoia_check(serial, __func__)) {
2130                 dbg("%s", "Invalid Serial");
2131                 return;
2132         }
2133
2134         mos7840_port = mos7840_get_port_private(port);
2135
2136         if (mos7840_port == NULL)
2137                 return;
2138
2139         if (!mos7840_port->open) {
2140                 dbg("%s - port not opened", __func__);
2141                 return;
2142         }
2143
2144         dbg("%s", "setting termios - ");
2145
2146         cflag = tty->termios->c_cflag;
2147
2148         dbg("%s - clfag %08x iflag %08x", __func__,
2149             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2150         dbg("%s - old clfag %08x old iflag %08x", __func__,
2151             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2152         dbg("%s - port %d", __func__, port->number);
2153
2154         /* change the port settings to the new ones specified */
2155
2156         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2157
2158         if (!mos7840_port->read_urb) {
2159                 dbg("%s", "URB KILLED !!!!!");
2160                 return;
2161         }
2162
2163         if (mos7840_port->read_urb_busy == false) {
2164                 mos7840_port->read_urb->dev = serial->dev;
2165                 mos7840_port->read_urb_busy = true;
2166                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2167                 if (status) {
2168                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2169                             status);
2170                         mos7840_port->read_urb_busy = false;
2171                 }
2172         }
2173 }
2174
2175 /*****************************************************************************
2176  * mos7840_get_lsr_info - get line status register info
2177  *
2178  * Purpose: Let user call ioctl() to get info when the UART physically
2179  *          is emptied.  On bus types like RS485, the transmitter must
2180  *          release the bus after transmitting. This must be done when
2181  *          the transmit shift register is empty, not be done when the
2182  *          transmit holding register is empty.  This functionality
2183  *          allows an RS485 driver to be written in user space.
2184  *****************************************************************************/
2185
2186 static int mos7840_get_lsr_info(struct tty_struct *tty,
2187                                 unsigned int __user *value)
2188 {
2189         int count;
2190         unsigned int result = 0;
2191
2192         count = mos7840_chars_in_buffer(tty);
2193         if (count == 0) {
2194                 dbg("%s -- Empty", __func__);
2195                 result = TIOCSER_TEMT;
2196         }
2197
2198         if (copy_to_user(value, &result, sizeof(int)))
2199                 return -EFAULT;
2200         return 0;
2201 }
2202
2203 /*****************************************************************************
2204  * mos7840_get_serial_info
2205  *      function to get information about serial port
2206  *****************************************************************************/
2207
2208 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2209                                    struct serial_struct __user *retinfo)
2210 {
2211         struct serial_struct tmp;
2212
2213         if (mos7840_port == NULL)
2214                 return -1;
2215
2216         if (!retinfo)
2217                 return -EFAULT;
2218
2219         memset(&tmp, 0, sizeof(tmp));
2220
2221         tmp.type = PORT_16550A;
2222         tmp.line = mos7840_port->port->serial->minor;
2223         tmp.port = mos7840_port->port->number;
2224         tmp.irq = 0;
2225         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2226         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2227         tmp.baud_base = 9600;
2228         tmp.close_delay = 5 * HZ;
2229         tmp.closing_wait = 30 * HZ;
2230
2231         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2232                 return -EFAULT;
2233         return 0;
2234 }
2235
2236 static int mos7840_get_icount(struct tty_struct *tty,
2237                         struct serial_icounter_struct *icount)
2238 {
2239         struct usb_serial_port *port = tty->driver_data;
2240         struct moschip_port *mos7840_port;
2241         struct async_icount cnow;
2242
2243         mos7840_port = mos7840_get_port_private(port);
2244         cnow = mos7840_port->icount;
2245
2246         smp_rmb();
2247         icount->cts = cnow.cts;
2248         icount->dsr = cnow.dsr;
2249         icount->rng = cnow.rng;
2250         icount->dcd = cnow.dcd;
2251         icount->rx = cnow.rx;
2252         icount->tx = cnow.tx;
2253         icount->frame = cnow.frame;
2254         icount->overrun = cnow.overrun;
2255         icount->parity = cnow.parity;
2256         icount->brk = cnow.brk;
2257         icount->buf_overrun = cnow.buf_overrun;
2258
2259         dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2260                 port->number, icount->rx, icount->tx);
2261         return 0;
2262 }
2263
2264 /*****************************************************************************
2265  * SerialIoctl
2266  *      this function handles any ioctl calls to the driver
2267  *****************************************************************************/
2268
2269 static int mos7840_ioctl(struct tty_struct *tty,
2270                          unsigned int cmd, unsigned long arg)
2271 {
2272         struct usb_serial_port *port = tty->driver_data;
2273         void __user *argp = (void __user *)arg;
2274         struct moschip_port *mos7840_port;
2275
2276         struct async_icount cnow;
2277         struct async_icount cprev;
2278
2279         if (mos7840_port_paranoia_check(port, __func__)) {
2280                 dbg("%s", "Invalid port");
2281                 return -1;
2282         }
2283
2284         mos7840_port = mos7840_get_port_private(port);
2285
2286         if (mos7840_port == NULL)
2287                 return -1;
2288
2289         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2290
2291         switch (cmd) {
2292                 /* return number of bytes available */
2293
2294         case TIOCSERGETLSR:
2295                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2296                 return mos7840_get_lsr_info(tty, argp);
2297
2298         case TIOCGSERIAL:
2299                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2300                 return mos7840_get_serial_info(mos7840_port, argp);
2301
2302         case TIOCSSERIAL:
2303                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2304                 break;
2305
2306         case TIOCMIWAIT:
2307                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2308                 cprev = mos7840_port->icount;
2309                 while (1) {
2310                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2311                         mos7840_port->delta_msr_cond = 0;
2312                         wait_event_interruptible(port->delta_msr_wait,
2313                                                  (port->serial->disconnected ||
2314                                                   mos7840_port->
2315                                                   delta_msr_cond == 1));
2316
2317                         /* see if a signal did it */
2318                         if (signal_pending(current))
2319                                 return -ERESTARTSYS;
2320
2321                         if (port->serial->disconnected)
2322                                 return -EIO;
2323
2324                         cnow = mos7840_port->icount;
2325                         smp_rmb();
2326                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2327                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2328                                 return -EIO;    /* no change => error */
2329                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2330                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2331                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2332                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2333                                 return 0;
2334                         }
2335                         cprev = cnow;
2336                 }
2337                 /* NOTREACHED */
2338                 break;
2339
2340         default:
2341                 break;
2342         }
2343         return -ENOIOCTLCMD;
2344 }
2345
2346 static int mos7840_calc_num_ports(struct usb_serial *serial)
2347 {
2348         __u16 Data = 0x00;
2349         int ret = 0;
2350         int mos7840_num_ports;
2351
2352         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2353                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &Data,
2354                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2355
2356         if ((Data & 0x01) == 0) {
2357                 mos7840_num_ports = 2;
2358                 serial->num_bulk_in = 2;
2359                 serial->num_bulk_out = 2;
2360                 serial->num_ports = 2;
2361         } else {
2362                 mos7840_num_ports = 4;
2363                 serial->num_bulk_in = 4;
2364                 serial->num_bulk_out = 4;
2365                 serial->num_ports = 4;
2366         }
2367
2368         return mos7840_num_ports;
2369 }
2370
2371 /****************************************************************************
2372  * mos7840_startup
2373  ****************************************************************************/
2374
2375 static int mos7840_startup(struct usb_serial *serial)
2376 {
2377         struct moschip_port *mos7840_port;
2378         struct usb_device *dev;
2379         int i, status;
2380
2381         __u16 Data;
2382         dbg("%s", "mos7840_startup :Entering..........");
2383
2384         if (!serial) {
2385                 dbg("%s", "Invalid Handler");
2386                 return -1;
2387         }
2388
2389         dev = serial->dev;
2390
2391         dbg("%s", "Entering...");
2392         dbg ("mos7840_startup: serial = %p", serial);
2393
2394         /* we set up the pointers to the endpoints in the mos7840_open *
2395          * function, as the structures aren't created yet.             */
2396
2397         /* set up port private structures */
2398         for (i = 0; i < serial->num_ports; ++i) {
2399                 dbg ("mos7840_startup: configuring port %d............", i);
2400                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2401                 if (mos7840_port == NULL) {
2402                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2403                         status = -ENOMEM;
2404                         i--; /* don't follow NULL pointer cleaning up */
2405                         goto error;
2406                 }
2407
2408                 /* Initialize all port interrupt end point to port 0 int
2409                  * endpoint. Our device has only one interrupt end point
2410                  * common to all port */
2411
2412                 mos7840_port->port = serial->port[i];
2413                 mos7840_set_port_private(serial->port[i], mos7840_port);
2414                 spin_lock_init(&mos7840_port->pool_lock);
2415
2416                 /* minor is not initialised until later by
2417                  * usb-serial.c:get_free_serial() and cannot therefore be used
2418                  * to index device instances */
2419                 mos7840_port->port_num = i + 1;
2420                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2421                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2422                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2423                 dbg ("serial->minor = %d", serial->minor);
2424
2425                 if (mos7840_port->port_num == 1) {
2426                         mos7840_port->SpRegOffset = 0x0;
2427                         mos7840_port->ControlRegOffset = 0x1;
2428                         mos7840_port->DcrRegOffset = 0x4;
2429                 } else if ((mos7840_port->port_num == 2)
2430                            && (serial->num_ports == 4)) {
2431                         mos7840_port->SpRegOffset = 0x8;
2432                         mos7840_port->ControlRegOffset = 0x9;
2433                         mos7840_port->DcrRegOffset = 0x16;
2434                 } else if ((mos7840_port->port_num == 2)
2435                            && (serial->num_ports == 2)) {
2436                         mos7840_port->SpRegOffset = 0xa;
2437                         mos7840_port->ControlRegOffset = 0xb;
2438                         mos7840_port->DcrRegOffset = 0x19;
2439                 } else if ((mos7840_port->port_num == 3)
2440                            && (serial->num_ports == 4)) {
2441                         mos7840_port->SpRegOffset = 0xa;
2442                         mos7840_port->ControlRegOffset = 0xb;
2443                         mos7840_port->DcrRegOffset = 0x19;
2444                 } else if ((mos7840_port->port_num == 4)
2445                            && (serial->num_ports == 4)) {
2446                         mos7840_port->SpRegOffset = 0xc;
2447                         mos7840_port->ControlRegOffset = 0xd;
2448                         mos7840_port->DcrRegOffset = 0x1c;
2449                 }
2450                 mos7840_dump_serial_port(mos7840_port);
2451                 mos7840_set_port_private(serial->port[i], mos7840_port);
2452
2453                 /* enable rx_disable bit in control register */
2454                 status = mos7840_get_reg_sync(serial->port[i],
2455                                  mos7840_port->ControlRegOffset, &Data);
2456                 if (status < 0) {
2457                         dbg("Reading ControlReg failed status-0x%x", status);
2458                         break;
2459                 } else
2460                         dbg("ControlReg Reading success val is %x, status%d",
2461                             Data, status);
2462                 Data |= 0x08;   /* setting driver done bit */
2463                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2464                                    modem status reg */
2465
2466                 /* Data |= 0x20; //rx_disable bit */
2467                 status = mos7840_set_reg_sync(serial->port[i],
2468                                          mos7840_port->ControlRegOffset, Data);
2469                 if (status < 0) {
2470                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2471                         break;
2472                 } else
2473                         dbg("ControlReg Writing success(rx_disable) status%d",
2474                             status);
2475
2476                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2477                    and 0x24 in DCR3 */
2478                 Data = 0x01;
2479                 status = mos7840_set_reg_sync(serial->port[i],
2480                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2481                 if (status < 0) {
2482                         dbg("Writing DCR0 failed status-0x%x", status);
2483                         break;
2484                 } else
2485                         dbg("DCR0 Writing success status%d", status);
2486
2487                 Data = 0x05;
2488                 status = mos7840_set_reg_sync(serial->port[i],
2489                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2490                 if (status < 0) {
2491                         dbg("Writing DCR1 failed status-0x%x", status);
2492                         break;
2493                 } else
2494                         dbg("DCR1 Writing success status%d", status);
2495
2496                 Data = 0x24;
2497                 status = mos7840_set_reg_sync(serial->port[i],
2498                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2499                 if (status < 0) {
2500                         dbg("Writing DCR2 failed status-0x%x", status);
2501                         break;
2502                 } else
2503                         dbg("DCR2 Writing success status%d", status);
2504
2505                 /* write values in clkstart0x0 and clkmulti 0x20 */
2506                 Data = 0x0;
2507                 status = mos7840_set_reg_sync(serial->port[i],
2508                                          CLK_START_VALUE_REGISTER, Data);
2509                 if (status < 0) {
2510                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2511                         break;
2512                 } else
2513                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2514
2515                 Data = 0x20;
2516                 status = mos7840_set_reg_sync(serial->port[i],
2517                                         CLK_MULTI_REGISTER, Data);
2518                 if (status < 0) {
2519                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2520                             status);
2521                         goto error;
2522                 } else
2523                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2524                             status);
2525
2526                 /* write value 0x0 to scratchpad register */
2527                 Data = 0x00;
2528                 status = mos7840_set_uart_reg(serial->port[i],
2529                                                 SCRATCH_PAD_REGISTER, Data);
2530                 if (status < 0) {
2531                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2532                             status);
2533                         break;
2534                 } else
2535                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2536                             status);
2537
2538                 /* Zero Length flag register */
2539                 if ((mos7840_port->port_num != 1)
2540                     && (serial->num_ports == 2)) {
2541
2542                         Data = 0xff;
2543                         status = mos7840_set_reg_sync(serial->port[i],
2544                                       (__u16) (ZLP_REG1 +
2545                                       ((__u16)mos7840_port->port_num)), Data);
2546                         dbg("ZLIP offset %x",
2547                             (__u16) (ZLP_REG1 +
2548                                         ((__u16) mos7840_port->port_num)));
2549                         if (status < 0) {
2550                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2551                                     i + 2, status);
2552                                 break;
2553                         } else
2554                                 dbg("ZLP_REG%d Writing success status%d",
2555                                     i + 2, status);
2556                 } else {
2557                         Data = 0xff;
2558                         status = mos7840_set_reg_sync(serial->port[i],
2559                               (__u16) (ZLP_REG1 +
2560                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2561                         dbg("ZLIP offset %x",
2562                             (__u16) (ZLP_REG1 +
2563                                      ((__u16) mos7840_port->port_num) - 0x1));
2564                         if (status < 0) {
2565                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2566                                     i + 1, status);
2567                                 break;
2568                         } else
2569                                 dbg("ZLP_REG%d Writing success status%d",
2570                                     i + 1, status);
2571
2572                 }
2573                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2574                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2575                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2576                                                                 GFP_KERNEL);
2577                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2578                                                         !mos7840_port->dr) {
2579                         status = -ENOMEM;
2580                         goto error;
2581                 }
2582         }
2583         dbg ("mos7840_startup: all ports configured...........");
2584
2585         /* Zero Length flag enable */
2586         Data = 0x0f;
2587         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2588         if (status < 0) {
2589                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2590                 goto error;
2591         } else
2592                 dbg("ZLP_REG5 Writing success status%d", status);
2593
2594         /* setting configuration feature to one */
2595         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2596                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2597         return 0;
2598 error:
2599         for (/* nothing */; i >= 0; i--) {
2600                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2601
2602                 kfree(mos7840_port->dr);
2603                 kfree(mos7840_port->ctrl_buf);
2604                 usb_free_urb(mos7840_port->control_urb);
2605                 kfree(mos7840_port);
2606         }
2607         return status;
2608 }
2609
2610 /****************************************************************************
2611  * mos7840_disconnect
2612  *      This function is called whenever the device is removed from the usb bus.
2613  ****************************************************************************/
2614
2615 static void mos7840_disconnect(struct usb_serial *serial)
2616 {
2617         int i;
2618         struct moschip_port *mos7840_port;
2619         dbg("%s", " disconnect :entering..........");
2620
2621         if (!serial) {
2622                 dbg("%s", "Invalid Handler");
2623                 return;
2624         }
2625
2626         /* check for the ports to be closed,close the ports and disconnect */
2627
2628         /* free private structure allocated for serial port  *
2629          * stop reads and writes on all ports                */
2630
2631         for (i = 0; i < serial->num_ports; ++i) {
2632                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2633                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2634                 if (mos7840_port) {
2635                         usb_kill_urb(mos7840_port->control_urb);
2636                 }
2637         }
2638
2639         dbg("%s", "Thank u :: ");
2640
2641 }
2642
2643 /****************************************************************************
2644  * mos7840_release
2645  *      This function is called when the usb_serial structure is freed.
2646  ****************************************************************************/
2647
2648 static void mos7840_release(struct usb_serial *serial)
2649 {
2650         int i;
2651         struct moschip_port *mos7840_port;
2652         dbg("%s", " release :entering..........");
2653
2654         if (!serial) {
2655                 dbg("%s", "Invalid Handler");
2656                 return;
2657         }
2658
2659         /* check for the ports to be closed,close the ports and disconnect */
2660
2661         /* free private structure allocated for serial port  *
2662          * stop reads and writes on all ports                */
2663
2664         for (i = 0; i < serial->num_ports; ++i) {
2665                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2666                 dbg("mos7840_port %d = %p", i, mos7840_port);
2667                 if (mos7840_port) {
2668                         usb_free_urb(mos7840_port->control_urb);
2669                         kfree(mos7840_port->ctrl_buf);
2670                         kfree(mos7840_port->dr);
2671                         kfree(mos7840_port);
2672                 }
2673         }
2674
2675         dbg("%s", "Thank u :: ");
2676
2677 }
2678
2679 static struct usb_driver io_driver = {
2680         .name = "mos7840",
2681         .probe = usb_serial_probe,
2682         .disconnect = usb_serial_disconnect,
2683         .id_table = moschip_id_table_combined,
2684         .no_dynamic_id = 1,
2685 };
2686
2687 static struct usb_serial_driver moschip7840_4port_device = {
2688         .driver = {
2689                    .owner = THIS_MODULE,
2690                    .name = "mos7840",
2691                    },
2692         .description = DRIVER_DESC,
2693         .usb_driver = &io_driver,
2694         .id_table = moschip_port_id_table,
2695         .num_ports = 4,
2696         .open = mos7840_open,
2697         .close = mos7840_close,
2698         .write = mos7840_write,
2699         .write_room = mos7840_write_room,
2700         .chars_in_buffer = mos7840_chars_in_buffer,
2701         .throttle = mos7840_throttle,
2702         .unthrottle = mos7840_unthrottle,
2703         .calc_num_ports = mos7840_calc_num_ports,
2704 #ifdef MCSSerialProbe
2705         .probe = mos7840_serial_probe,
2706 #endif
2707         .ioctl = mos7840_ioctl,
2708         .set_termios = mos7840_set_termios,
2709         .break_ctl = mos7840_break,
2710         .tiocmget = mos7840_tiocmget,
2711         .tiocmset = mos7840_tiocmset,
2712         .get_icount = mos7840_get_icount,
2713         .attach = mos7840_startup,
2714         .disconnect = mos7840_disconnect,
2715         .release = mos7840_release,
2716         .read_bulk_callback = mos7840_bulk_in_callback,
2717         .read_int_callback = mos7840_interrupt_callback,
2718 };
2719
2720 /****************************************************************************
2721  * moschip7840_init
2722  *      This is called by the module subsystem, or on startup to initialize us
2723  ****************************************************************************/
2724 static int __init moschip7840_init(void)
2725 {
2726         int retval;
2727
2728         dbg("%s", " mos7840_init :entering..........");
2729
2730         /* Register with the usb serial */
2731         retval = usb_serial_register(&moschip7840_4port_device);
2732
2733         if (retval)
2734                 goto failed_port_device_register;
2735
2736         dbg("%s", "Entering...");
2737         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2738                DRIVER_DESC "\n");
2739
2740         /* Register with the usb */
2741         retval = usb_register(&io_driver);
2742         if (retval == 0) {
2743                 dbg("%s", "Leaving...");
2744                 return 0;
2745         }
2746         usb_serial_deregister(&moschip7840_4port_device);
2747 failed_port_device_register:
2748         return retval;
2749 }
2750
2751 /****************************************************************************
2752  * moschip7840_exit
2753  *      Called when the driver is about to be unloaded.
2754  ****************************************************************************/
2755 static void __exit moschip7840_exit(void)
2756 {
2757
2758         dbg("%s", " mos7840_exit :entering..........");
2759
2760         usb_deregister(&io_driver);
2761
2762         usb_serial_deregister(&moschip7840_4port_device);
2763
2764         dbg("%s", "Entering...");
2765 }
2766
2767 module_init(moschip7840_init);
2768 module_exit(moschip7840_exit);
2769
2770 /* Module information */
2771 MODULE_DESCRIPTION(DRIVER_DESC);
2772 MODULE_LICENSE("GPL");
2773
2774 module_param(debug, bool, S_IRUGO | S_IWUSR);
2775 MODULE_PARM_DESC(debug, "Debug enabled or not");