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                         response =
1076                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1077                                            GFP_KERNEL);
1078                         if (response) {
1079                                 dev_err(&port->dev, "%s - Error %d submitting "
1080                                         "interrupt urb\n", __func__, response);
1081                         }
1082
1083                 }
1084
1085         }
1086
1087         /* see if we've set up our endpoint info yet   *
1088          * (can't set it up in mos7840_startup as the  *
1089          * structures were not set up at that time.)   */
1090
1091         dbg("port number is %d", port->number);
1092         dbg("serial number is %d", port->serial->minor);
1093         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1094         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1095         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1096         dbg("port's number in the device is %d", mos7840_port->port_num);
1097         mos7840_port->read_urb = port->read_urb;
1098
1099         /* set up our bulk in urb */
1100         if ((serial->num_ports == 2)
1101                 && ((((__u16)port->number -
1102                         (__u16)(port->serial->minor)) % 2) != 0)) {
1103                 usb_fill_bulk_urb(mos7840_port->read_urb,
1104                         serial->dev,
1105                         usb_rcvbulkpipe(serial->dev,
1106                                 (port->bulk_in_endpointAddress) + 2),
1107                         port->bulk_in_buffer,
1108                         mos7840_port->read_urb->transfer_buffer_length,
1109                         mos7840_bulk_in_callback, mos7840_port);
1110         } else {
1111                 usb_fill_bulk_urb(mos7840_port->read_urb,
1112                         serial->dev,
1113                         usb_rcvbulkpipe(serial->dev,
1114                                 port->bulk_in_endpointAddress),
1115                         port->bulk_in_buffer,
1116                         mos7840_port->read_urb->transfer_buffer_length,
1117                         mos7840_bulk_in_callback, mos7840_port);
1118         }
1119
1120         dbg("mos7840_open: bulkin endpoint is %d",
1121             port->bulk_in_endpointAddress);
1122         mos7840_port->read_urb_busy = true;
1123         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1124         if (response) {
1125                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1126                         __func__, response);
1127                 mos7840_port->read_urb_busy = false;
1128         }
1129
1130         /* initialize our wait queues */
1131         init_waitqueue_head(&mos7840_port->wait_chase);
1132
1133         /* initialize our icount structure */
1134         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1135
1136         /* initialize our port settings */
1137         /* Must set to enable ints! */
1138         mos7840_port->shadowMCR = MCR_MASTER_IE;
1139         /* send a open port command */
1140         mos7840_port->open = 1;
1141         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1142         mos7840_port->icount.tx = 0;
1143         mos7840_port->icount.rx = 0;
1144
1145         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1146                                 serial, mos7840_port, port);
1147
1148         dbg ("%s leave", __func__);
1149
1150         return 0;
1151 err:
1152         for (j = 0; j < NUM_URBS; ++j) {
1153                 urb = mos7840_port->write_urb_pool[j];
1154                 if (!urb)
1155                         continue;
1156                 kfree(urb->transfer_buffer);
1157                 usb_free_urb(urb);
1158         }
1159         return status;
1160 }
1161
1162 /*****************************************************************************
1163  * mos7840_chars_in_buffer
1164  *      this function is called by the tty driver when it wants to know how many
1165  *      bytes of data we currently have outstanding in the port (data that has
1166  *      been written, but hasn't made it out the port yet)
1167  *      If successful, we return the number of bytes left to be written in the
1168  *      system,
1169  *      Otherwise we return zero.
1170  *****************************************************************************/
1171
1172 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1173 {
1174         struct usb_serial_port *port = tty->driver_data;
1175         int i;
1176         int chars = 0;
1177         unsigned long flags;
1178         struct moschip_port *mos7840_port;
1179
1180         dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1181
1182         if (mos7840_port_paranoia_check(port, __func__)) {
1183                 dbg("%s", "Invalid port");
1184                 return 0;
1185         }
1186
1187         mos7840_port = mos7840_get_port_private(port);
1188         if (mos7840_port == NULL) {
1189                 dbg("%s", "mos7840_break:leaving ...........");
1190                 return 0;
1191         }
1192
1193         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1194         for (i = 0; i < NUM_URBS; ++i) {
1195                 if (mos7840_port->busy[i]) {
1196                         struct urb *urb = mos7840_port->write_urb_pool[i];
1197                         chars += urb->transfer_buffer_length;
1198                 }
1199         }
1200         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1201         dbg("%s - returns %d", __func__, chars);
1202         return chars;
1203
1204 }
1205
1206 /*****************************************************************************
1207  * mos7840_close
1208  *      this function is called by the tty driver when a port is closed
1209  *****************************************************************************/
1210
1211 static void mos7840_close(struct usb_serial_port *port)
1212 {
1213         struct usb_serial *serial;
1214         struct moschip_port *mos7840_port;
1215         struct moschip_port *port0;
1216         int j;
1217         __u16 Data;
1218
1219         dbg("%s", "mos7840_close:entering...");
1220
1221         if (mos7840_port_paranoia_check(port, __func__)) {
1222                 dbg("%s", "Port Paranoia failed");
1223                 return;
1224         }
1225
1226         serial = mos7840_get_usb_serial(port, __func__);
1227         if (!serial) {
1228                 dbg("%s", "Serial Paranoia failed");
1229                 return;
1230         }
1231
1232         mos7840_port = mos7840_get_port_private(port);
1233         port0 = mos7840_get_port_private(serial->port[0]);
1234
1235         if (mos7840_port == NULL || port0 == NULL)
1236                 return;
1237
1238         for (j = 0; j < NUM_URBS; ++j)
1239                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1240
1241         /* Freeing Write URBs */
1242         for (j = 0; j < NUM_URBS; ++j) {
1243                 if (mos7840_port->write_urb_pool[j]) {
1244                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1245                                 kfree(mos7840_port->write_urb_pool[j]->
1246                                       transfer_buffer);
1247
1248                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1249                 }
1250         }
1251
1252         /* While closing port, shutdown all bulk read, write  *
1253          * and interrupt read if they exists                  */
1254         if (serial->dev) {
1255                 if (mos7840_port->write_urb) {
1256                         dbg("%s", "Shutdown bulk write");
1257                         usb_kill_urb(mos7840_port->write_urb);
1258                 }
1259                 if (mos7840_port->read_urb) {
1260                         dbg("%s", "Shutdown bulk read");
1261                         usb_kill_urb(mos7840_port->read_urb);
1262                         mos7840_port->read_urb_busy = false;
1263                 }
1264                 if ((&mos7840_port->control_urb)) {
1265                         dbg("%s", "Shutdown control read");
1266                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1267                 }
1268         }
1269 /*      if(mos7840_port->ctrl_buf != NULL) */
1270 /*              kfree(mos7840_port->ctrl_buf); */
1271         port0->open_ports--;
1272         dbg("mos7840_num_open_ports in close%d:in port%d",
1273             port0->open_ports, port->number);
1274         if (port0->open_ports == 0) {
1275                 if (serial->port[0]->interrupt_in_urb) {
1276                         dbg("%s", "Shutdown interrupt_in_urb");
1277                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1278                 }
1279         }
1280
1281         if (mos7840_port->write_urb) {
1282                 /* if this urb had a transfer buffer already (old tx) free it */
1283                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1284                         kfree(mos7840_port->write_urb->transfer_buffer);
1285                 usb_free_urb(mos7840_port->write_urb);
1286         }
1287
1288         Data = 0x0;
1289         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1290
1291         Data = 0x00;
1292         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1293
1294         mos7840_port->open = 0;
1295
1296         dbg("%s", "Leaving ............");
1297 }
1298
1299 /************************************************************************
1300  *
1301  * mos7840_block_until_chase_response
1302  *
1303  *      This function will block the close until one of the following:
1304  *              1. Response to our Chase comes from mos7840
1305  *              2. A timeout of 10 seconds without activity has expired
1306  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1307  *
1308  ************************************************************************/
1309
1310 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1311                                         struct moschip_port *mos7840_port)
1312 {
1313         int timeout = 1 * HZ;
1314         int wait = 10;
1315         int count;
1316
1317         while (1) {
1318                 count = mos7840_chars_in_buffer(tty);
1319
1320                 /* Check for Buffer status */
1321                 if (count <= 0)
1322                         return;
1323
1324                 /* Block the thread for a while */
1325                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1326                                                timeout);
1327                 /* No activity.. count down section */
1328                 wait--;
1329                 if (wait == 0) {
1330                         dbg("%s - TIMEOUT", __func__);
1331                         return;
1332                 } else {
1333                         /* Reset timeout value back to seconds */
1334                         wait = 10;
1335                 }
1336         }
1337
1338 }
1339
1340 /*****************************************************************************
1341  * mos7840_break
1342  *      this function sends a break to the port
1343  *****************************************************************************/
1344 static void mos7840_break(struct tty_struct *tty, int break_state)
1345 {
1346         struct usb_serial_port *port = tty->driver_data;
1347         unsigned char data;
1348         struct usb_serial *serial;
1349         struct moschip_port *mos7840_port;
1350
1351         dbg("%s", "Entering ...........");
1352         dbg("mos7840_break: Start");
1353
1354         if (mos7840_port_paranoia_check(port, __func__)) {
1355                 dbg("%s", "Port Paranoia failed");
1356                 return;
1357         }
1358
1359         serial = mos7840_get_usb_serial(port, __func__);
1360         if (!serial) {
1361                 dbg("%s", "Serial Paranoia failed");
1362                 return;
1363         }
1364
1365         mos7840_port = mos7840_get_port_private(port);
1366
1367         if (mos7840_port == NULL)
1368                 return;
1369
1370         if (serial->dev)
1371                 /* flush and block until tx is empty */
1372                 mos7840_block_until_chase_response(tty, mos7840_port);
1373
1374         if (break_state == -1)
1375                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1376         else
1377                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1378
1379         /* FIXME: no locking on shadowLCR anywhere in driver */
1380         mos7840_port->shadowLCR = data;
1381         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1382             mos7840_port->shadowLCR);
1383         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1384                              mos7840_port->shadowLCR);
1385 }
1386
1387 /*****************************************************************************
1388  * mos7840_write_room
1389  *      this function is called by the tty driver when it wants to know how many
1390  *      bytes of data we can accept for a specific port.
1391  *      If successful, we return the amount of room that we have for this port
1392  *      Otherwise we return a negative error number.
1393  *****************************************************************************/
1394
1395 static int mos7840_write_room(struct tty_struct *tty)
1396 {
1397         struct usb_serial_port *port = tty->driver_data;
1398         int i;
1399         int room = 0;
1400         unsigned long flags;
1401         struct moschip_port *mos7840_port;
1402
1403         dbg("%s", " mos7840_write_room:entering ...........");
1404
1405         if (mos7840_port_paranoia_check(port, __func__)) {
1406                 dbg("%s", "Invalid port");
1407                 dbg("%s", " mos7840_write_room:leaving ...........");
1408                 return -1;
1409         }
1410
1411         mos7840_port = mos7840_get_port_private(port);
1412         if (mos7840_port == NULL) {
1413                 dbg("%s", "mos7840_break:leaving ...........");
1414                 return -1;
1415         }
1416
1417         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1418         for (i = 0; i < NUM_URBS; ++i) {
1419                 if (!mos7840_port->busy[i])
1420                         room += URB_TRANSFER_BUFFER_SIZE;
1421         }
1422         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1423
1424         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1425         dbg("%s - returns %d", __func__, room);
1426         return room;
1427
1428 }
1429
1430 /*****************************************************************************
1431  * mos7840_write
1432  *      this function is called by the tty driver when data should be written to
1433  *      the port.
1434  *      If successful, we return the number of bytes written, otherwise we
1435  *      return a negative error number.
1436  *****************************************************************************/
1437
1438 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1439                          const unsigned char *data, int count)
1440 {
1441         int status;
1442         int i;
1443         int bytes_sent = 0;
1444         int transfer_size;
1445         unsigned long flags;
1446
1447         struct moschip_port *mos7840_port;
1448         struct usb_serial *serial;
1449         struct urb *urb;
1450         /* __u16 Data; */
1451         const unsigned char *current_position = data;
1452         unsigned char *data1;
1453         dbg("%s", "entering ...........");
1454         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1455                                         mos7840_port->shadowLCR); */
1456
1457 #ifdef NOTMOS7840
1458         Data = 0x00;
1459         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1460         mos7840_port->shadowLCR = Data;
1461         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1462         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1463             mos7840_port->shadowLCR);
1464
1465         /* Data = 0x03; */
1466         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1467         /* mos7840_port->shadowLCR=Data;//Need to add later */
1468
1469         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1470         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1471
1472         /* Data = 0x0c; */
1473         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1474         Data = 0x00;
1475         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1476         dbg("mos7840_write:DLL value is %x", Data);
1477
1478         Data = 0x0;
1479         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1480         dbg("mos7840_write:DLM value is %x", Data);
1481
1482         Data = Data & ~SERIAL_LCR_DLAB;
1483         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1484             mos7840_port->shadowLCR);
1485         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1486 #endif
1487
1488         if (mos7840_port_paranoia_check(port, __func__)) {
1489                 dbg("%s", "Port Paranoia failed");
1490                 return -1;
1491         }
1492
1493         serial = port->serial;
1494         if (mos7840_serial_paranoia_check(serial, __func__)) {
1495                 dbg("%s", "Serial Paranoia failed");
1496                 return -1;
1497         }
1498
1499         mos7840_port = mos7840_get_port_private(port);
1500         if (mos7840_port == NULL) {
1501                 dbg("%s", "mos7840_port is NULL");
1502                 return -1;
1503         }
1504
1505         /* try to find a free urb in the list */
1506         urb = NULL;
1507
1508         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1509         for (i = 0; i < NUM_URBS; ++i) {
1510                 if (!mos7840_port->busy[i]) {
1511                         mos7840_port->busy[i] = 1;
1512                         urb = mos7840_port->write_urb_pool[i];
1513                         dbg("URB:%d", i);
1514                         break;
1515                 }
1516         }
1517         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1518
1519         if (urb == NULL) {
1520                 dbg("%s - no more free urbs", __func__);
1521                 goto exit;
1522         }
1523
1524         if (urb->transfer_buffer == NULL) {
1525                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1526                                                GFP_ATOMIC);
1527
1528                 if (urb->transfer_buffer == NULL) {
1529                         dev_err(&port->dev, "%s no more kernel memory...\n",
1530                                 __func__);
1531                         goto exit;
1532                 }
1533         }
1534         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1535
1536         memcpy(urb->transfer_buffer, current_position, transfer_size);
1537
1538         /* fill urb with data and submit  */
1539         if ((serial->num_ports == 2)
1540                 && ((((__u16)port->number -
1541                         (__u16)(port->serial->minor)) % 2) != 0)) {
1542                 usb_fill_bulk_urb(urb,
1543                         serial->dev,
1544                         usb_sndbulkpipe(serial->dev,
1545                                 (port->bulk_out_endpointAddress) + 2),
1546                         urb->transfer_buffer,
1547                         transfer_size,
1548                         mos7840_bulk_out_data_callback, mos7840_port);
1549         } else {
1550                 usb_fill_bulk_urb(urb,
1551                         serial->dev,
1552                         usb_sndbulkpipe(serial->dev,
1553                                 port->bulk_out_endpointAddress),
1554                         urb->transfer_buffer,
1555                         transfer_size,
1556                         mos7840_bulk_out_data_callback, mos7840_port);
1557         }
1558
1559         data1 = urb->transfer_buffer;
1560         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1561
1562         /* send it down the pipe */
1563         status = usb_submit_urb(urb, GFP_ATOMIC);
1564
1565         if (status) {
1566                 mos7840_port->busy[i] = 0;
1567                 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1568                         "with status = %d\n", __func__, status);
1569                 bytes_sent = status;
1570                 goto exit;
1571         }
1572         bytes_sent = transfer_size;
1573         mos7840_port->icount.tx += transfer_size;
1574         smp_wmb();
1575         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1576 exit:
1577         return bytes_sent;
1578
1579 }
1580
1581 /*****************************************************************************
1582  * mos7840_throttle
1583  *      this function is called by the tty driver when it wants to stop the data
1584  *      being read from the port.
1585  *****************************************************************************/
1586
1587 static void mos7840_throttle(struct tty_struct *tty)
1588 {
1589         struct usb_serial_port *port = tty->driver_data;
1590         struct moschip_port *mos7840_port;
1591         int status;
1592
1593         if (mos7840_port_paranoia_check(port, __func__)) {
1594                 dbg("%s", "Invalid port");
1595                 return;
1596         }
1597
1598         dbg("- port %d", port->number);
1599
1600         mos7840_port = mos7840_get_port_private(port);
1601
1602         if (mos7840_port == NULL)
1603                 return;
1604
1605         if (!mos7840_port->open) {
1606                 dbg("%s", "port not opened");
1607                 return;
1608         }
1609
1610         dbg("%s", "Entering ..........");
1611
1612         /* if we are implementing XON/XOFF, send the stop character */
1613         if (I_IXOFF(tty)) {
1614                 unsigned char stop_char = STOP_CHAR(tty);
1615                 status = mos7840_write(tty, port, &stop_char, 1);
1616                 if (status <= 0)
1617                         return;
1618         }
1619         /* if we are implementing RTS/CTS, toggle that line */
1620         if (tty->termios->c_cflag & CRTSCTS) {
1621                 mos7840_port->shadowMCR &= ~MCR_RTS;
1622                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1623                                          mos7840_port->shadowMCR);
1624                 if (status < 0)
1625                         return;
1626         }
1627 }
1628
1629 /*****************************************************************************
1630  * mos7840_unthrottle
1631  *      this function is called by the tty driver when it wants to resume
1632  *      the data being read from the port (called after mos7840_throttle is
1633  *      called)
1634  *****************************************************************************/
1635 static void mos7840_unthrottle(struct tty_struct *tty)
1636 {
1637         struct usb_serial_port *port = tty->driver_data;
1638         int status;
1639         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1640
1641         if (mos7840_port_paranoia_check(port, __func__)) {
1642                 dbg("%s", "Invalid port");
1643                 return;
1644         }
1645
1646         if (mos7840_port == NULL)
1647                 return;
1648
1649         if (!mos7840_port->open) {
1650                 dbg("%s - port not opened", __func__);
1651                 return;
1652         }
1653
1654         dbg("%s", "Entering ..........");
1655
1656         /* if we are implementing XON/XOFF, send the start character */
1657         if (I_IXOFF(tty)) {
1658                 unsigned char start_char = START_CHAR(tty);
1659                 status = mos7840_write(tty, port, &start_char, 1);
1660                 if (status <= 0)
1661                         return;
1662         }
1663
1664         /* if we are implementing RTS/CTS, toggle that line */
1665         if (tty->termios->c_cflag & CRTSCTS) {
1666                 mos7840_port->shadowMCR |= MCR_RTS;
1667                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1668                                          mos7840_port->shadowMCR);
1669                 if (status < 0)
1670                         return;
1671         }
1672 }
1673
1674 static int mos7840_tiocmget(struct tty_struct *tty)
1675 {
1676         struct usb_serial_port *port = tty->driver_data;
1677         struct moschip_port *mos7840_port;
1678         unsigned int result;
1679         __u16 msr;
1680         __u16 mcr;
1681         int status;
1682         mos7840_port = mos7840_get_port_private(port);
1683
1684         dbg("%s - port %d", __func__, port->number);
1685
1686         if (mos7840_port == NULL)
1687                 return -ENODEV;
1688
1689         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1690         if (status != 1)
1691                 return -EIO;
1692         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1693         if (status != 1)
1694                 return -EIO;
1695         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1696             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1697             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1698             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1699             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1700             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1701             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1702
1703         dbg("%s - 0x%04X", __func__, result);
1704
1705         return result;
1706 }
1707
1708 static int mos7840_tiocmset(struct tty_struct *tty,
1709                             unsigned int set, unsigned int clear)
1710 {
1711         struct usb_serial_port *port = tty->driver_data;
1712         struct moschip_port *mos7840_port;
1713         unsigned int mcr;
1714         int status;
1715
1716         dbg("%s - port %d", __func__, port->number);
1717
1718         mos7840_port = mos7840_get_port_private(port);
1719
1720         if (mos7840_port == NULL)
1721                 return -ENODEV;
1722
1723         /* FIXME: What locks the port registers ? */
1724         mcr = mos7840_port->shadowMCR;
1725         if (clear & TIOCM_RTS)
1726                 mcr &= ~MCR_RTS;
1727         if (clear & TIOCM_DTR)
1728                 mcr &= ~MCR_DTR;
1729         if (clear & TIOCM_LOOP)
1730                 mcr &= ~MCR_LOOPBACK;
1731
1732         if (set & TIOCM_RTS)
1733                 mcr |= MCR_RTS;
1734         if (set & TIOCM_DTR)
1735                 mcr |= MCR_DTR;
1736         if (set & TIOCM_LOOP)
1737                 mcr |= MCR_LOOPBACK;
1738
1739         mos7840_port->shadowMCR = mcr;
1740
1741         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1742         if (status < 0) {
1743                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1744                 return status;
1745         }
1746
1747         return 0;
1748 }
1749
1750 /*****************************************************************************
1751  * mos7840_calc_baud_rate_divisor
1752  *      this function calculates the proper baud rate divisor for the specified
1753  *      baud rate.
1754  *****************************************************************************/
1755 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1756                                           __u16 *clk_sel_val)
1757 {
1758
1759         dbg("%s - %d", __func__, baudRate);
1760
1761         if (baudRate <= 115200) {
1762                 *divisor = 115200 / baudRate;
1763                 *clk_sel_val = 0x0;
1764         }
1765         if ((baudRate > 115200) && (baudRate <= 230400)) {
1766                 *divisor = 230400 / baudRate;
1767                 *clk_sel_val = 0x10;
1768         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1769                 *divisor = 403200 / baudRate;
1770                 *clk_sel_val = 0x20;
1771         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1772                 *divisor = 460800 / baudRate;
1773                 *clk_sel_val = 0x30;
1774         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1775                 *divisor = 806400 / baudRate;
1776                 *clk_sel_val = 0x40;
1777         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1778                 *divisor = 921600 / baudRate;
1779                 *clk_sel_val = 0x50;
1780         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1781                 *divisor = 1572864 / baudRate;
1782                 *clk_sel_val = 0x60;
1783         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1784                 *divisor = 3145728 / baudRate;
1785                 *clk_sel_val = 0x70;
1786         }
1787         return 0;
1788
1789 #ifdef NOTMCS7840
1790
1791         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1792                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1793                         *divisor = mos7840_divisor_table[i].Divisor;
1794                         return 0;
1795                 }
1796         }
1797
1798         /* After trying for all the standard baud rates    *
1799          * Try calculating the divisor for this baud rate  */
1800
1801         if (baudrate > 75 && baudrate < 230400) {
1802                 /* get the divisor */
1803                 custom = (__u16) (230400L / baudrate);
1804
1805                 /* Check for round off */
1806                 round1 = (__u16) (2304000L / baudrate);
1807                 round = (__u16) (round1 - (custom * 10));
1808                 if (round > 4)
1809                         custom++;
1810                 *divisor = custom;
1811
1812                 dbg(" Baud %d = %d", baudrate, custom);
1813                 return 0;
1814         }
1815
1816         dbg("%s", " Baud calculation Failed...");
1817         return -1;
1818 #endif
1819 }
1820
1821 /*****************************************************************************
1822  * mos7840_send_cmd_write_baud_rate
1823  *      this function sends the proper command to change the baud rate of the
1824  *      specified port.
1825  *****************************************************************************/
1826
1827 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1828                                             int baudRate)
1829 {
1830         int divisor = 0;
1831         int status;
1832         __u16 Data;
1833         unsigned char number;
1834         __u16 clk_sel_val;
1835         struct usb_serial_port *port;
1836
1837         if (mos7840_port == NULL)
1838                 return -1;
1839
1840         port = (struct usb_serial_port *)mos7840_port->port;
1841         if (mos7840_port_paranoia_check(port, __func__)) {
1842                 dbg("%s", "Invalid port");
1843                 return -1;
1844         }
1845
1846         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1847                 dbg("%s", "Invalid Serial");
1848                 return -1;
1849         }
1850
1851         dbg("%s", "Entering ..........");
1852
1853         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1854
1855         dbg("%s - port = %d, baud = %d", __func__,
1856             mos7840_port->port->number, baudRate);
1857         /* reset clk_uart_sel in spregOffset */
1858         if (baudRate > 115200) {
1859 #ifdef HW_flow_control
1860                 /* NOTE: need to see the pther register to modify */
1861                 /* setting h/w flow control bit to 1 */
1862                 Data = 0x2b;
1863                 mos7840_port->shadowMCR = Data;
1864                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1865                                                                         Data);
1866                 if (status < 0) {
1867                         dbg("Writing spreg failed in set_serial_baud");
1868                         return -1;
1869                 }
1870 #endif
1871
1872         } else {
1873 #ifdef HW_flow_control
1874                 /* setting h/w flow control bit to 0 */
1875                 Data = 0xb;
1876                 mos7840_port->shadowMCR = Data;
1877                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1878                                                                         Data);
1879                 if (status < 0) {
1880                         dbg("Writing spreg failed in set_serial_baud");
1881                         return -1;
1882                 }
1883 #endif
1884
1885         }
1886
1887         if (1) {                /* baudRate <= 115200) */
1888                 clk_sel_val = 0x0;
1889                 Data = 0x0;
1890                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1891                                                    &clk_sel_val);
1892                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1893                                                                  &Data);
1894                 if (status < 0) {
1895                         dbg("reading spreg failed in set_serial_baud");
1896                         return -1;
1897                 }
1898                 Data = (Data & 0x8f) | clk_sel_val;
1899                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1900                                                                 Data);
1901                 if (status < 0) {
1902                         dbg("Writing spreg failed in set_serial_baud");
1903                         return -1;
1904                 }
1905                 /* Calculate the Divisor */
1906
1907                 if (status) {
1908                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1909                         return status;
1910                 }
1911                 /* Enable access to divisor latch */
1912                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1913                 mos7840_port->shadowLCR = Data;
1914                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1915
1916                 /* Write the divisor */
1917                 Data = (unsigned char)(divisor & 0xff);
1918                 dbg("set_serial_baud Value to write DLL is %x", Data);
1919                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1920
1921                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1922                 dbg("set_serial_baud Value to write DLM is %x", Data);
1923                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1924
1925                 /* Disable access to divisor latch */
1926                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1927                 mos7840_port->shadowLCR = Data;
1928                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1929
1930         }
1931         return status;
1932 }
1933
1934 /*****************************************************************************
1935  * mos7840_change_port_settings
1936  *      This routine is called to set the UART on the device to match
1937  *      the specified new settings.
1938  *****************************************************************************/
1939
1940 static void mos7840_change_port_settings(struct tty_struct *tty,
1941         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1942 {
1943         int baud;
1944         unsigned cflag;
1945         unsigned iflag;
1946         __u8 lData;
1947         __u8 lParity;
1948         __u8 lStop;
1949         int status;
1950         __u16 Data;
1951         struct usb_serial_port *port;
1952         struct usb_serial *serial;
1953
1954         if (mos7840_port == NULL)
1955                 return;
1956
1957         port = (struct usb_serial_port *)mos7840_port->port;
1958
1959         if (mos7840_port_paranoia_check(port, __func__)) {
1960                 dbg("%s", "Invalid port");
1961                 return;
1962         }
1963
1964         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1965                 dbg("%s", "Invalid Serial");
1966                 return;
1967         }
1968
1969         serial = port->serial;
1970
1971         dbg("%s - port %d", __func__, mos7840_port->port->number);
1972
1973         if (!mos7840_port->open) {
1974                 dbg("%s - port not opened", __func__);
1975                 return;
1976         }
1977
1978         dbg("%s", "Entering ..........");
1979
1980         lData = LCR_BITS_8;
1981         lStop = LCR_STOP_1;
1982         lParity = LCR_PAR_NONE;
1983
1984         cflag = tty->termios->c_cflag;
1985         iflag = tty->termios->c_iflag;
1986
1987         /* Change the number of bits */
1988         switch (cflag & CSIZE) {
1989         case CS5:
1990                 lData = LCR_BITS_5;
1991                 break;
1992
1993         case CS6:
1994                 lData = LCR_BITS_6;
1995                 break;
1996
1997         case CS7:
1998                 lData = LCR_BITS_7;
1999                 break;
2000
2001         default:
2002         case CS8:
2003                 lData = LCR_BITS_8;
2004                 break;
2005         }
2006
2007         /* Change the Parity bit */
2008         if (cflag & PARENB) {
2009                 if (cflag & PARODD) {
2010                         lParity = LCR_PAR_ODD;
2011                         dbg("%s - parity = odd", __func__);
2012                 } else {
2013                         lParity = LCR_PAR_EVEN;
2014                         dbg("%s - parity = even", __func__);
2015                 }
2016
2017         } else {
2018                 dbg("%s - parity = none", __func__);
2019         }
2020
2021         if (cflag & CMSPAR)
2022                 lParity = lParity | 0x20;
2023
2024         /* Change the Stop bit */
2025         if (cflag & CSTOPB) {
2026                 lStop = LCR_STOP_2;
2027                 dbg("%s - stop bits = 2", __func__);
2028         } else {
2029                 lStop = LCR_STOP_1;
2030                 dbg("%s - stop bits = 1", __func__);
2031         }
2032
2033         /* Update the LCR with the correct value */
2034         mos7840_port->shadowLCR &=
2035             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2036         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2037
2038         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2039             mos7840_port->shadowLCR);
2040         /* Disable Interrupts */
2041         Data = 0x00;
2042         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2043
2044         Data = 0x00;
2045         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2046
2047         Data = 0xcf;
2048         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2049
2050         /* Send the updated LCR value to the mos7840 */
2051         Data = mos7840_port->shadowLCR;
2052
2053         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2054
2055         Data = 0x00b;
2056         mos7840_port->shadowMCR = Data;
2057         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2058         Data = 0x00b;
2059         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2060
2061         /* set up the MCR register and send it to the mos7840 */
2062
2063         mos7840_port->shadowMCR = MCR_MASTER_IE;
2064         if (cflag & CBAUD)
2065                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2066
2067         if (cflag & CRTSCTS)
2068                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2069         else
2070                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2071
2072         Data = mos7840_port->shadowMCR;
2073         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2074
2075         /* Determine divisor based on baud rate */
2076         baud = tty_get_baud_rate(tty);
2077
2078         if (!baud) {
2079                 /* pick a default, any default... */
2080                 dbg("%s", "Picked default baud...");
2081                 baud = 9600;
2082         }
2083
2084         dbg("%s - baud rate = %d", __func__, baud);
2085         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2086
2087         /* Enable Interrupts */
2088         Data = 0x0c;
2089         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2090
2091         if (mos7840_port->read_urb_busy == false) {
2092                 mos7840_port->read_urb->dev = serial->dev;
2093                 mos7840_port->read_urb_busy = true;
2094                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2095                 if (status) {
2096                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2097                             status);
2098                         mos7840_port->read_urb_busy = false;
2099                 }
2100         }
2101         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2102             mos7840_port->shadowLCR);
2103 }
2104
2105 /*****************************************************************************
2106  * mos7840_set_termios
2107  *      this function is called by the tty driver when it wants to change
2108  *      the termios structure
2109  *****************************************************************************/
2110
2111 static void mos7840_set_termios(struct tty_struct *tty,
2112                                 struct usb_serial_port *port,
2113                                 struct ktermios *old_termios)
2114 {
2115         int status;
2116         unsigned int cflag;
2117         struct usb_serial *serial;
2118         struct moschip_port *mos7840_port;
2119         dbg("mos7840_set_termios: START");
2120         if (mos7840_port_paranoia_check(port, __func__)) {
2121                 dbg("%s", "Invalid port");
2122                 return;
2123         }
2124
2125         serial = port->serial;
2126
2127         if (mos7840_serial_paranoia_check(serial, __func__)) {
2128                 dbg("%s", "Invalid Serial");
2129                 return;
2130         }
2131
2132         mos7840_port = mos7840_get_port_private(port);
2133
2134         if (mos7840_port == NULL)
2135                 return;
2136
2137         if (!mos7840_port->open) {
2138                 dbg("%s - port not opened", __func__);
2139                 return;
2140         }
2141
2142         dbg("%s", "setting termios - ");
2143
2144         cflag = tty->termios->c_cflag;
2145
2146         dbg("%s - clfag %08x iflag %08x", __func__,
2147             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2148         dbg("%s - old clfag %08x old iflag %08x", __func__,
2149             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2150         dbg("%s - port %d", __func__, port->number);
2151
2152         /* change the port settings to the new ones specified */
2153
2154         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2155
2156         if (!mos7840_port->read_urb) {
2157                 dbg("%s", "URB KILLED !!!!!");
2158                 return;
2159         }
2160
2161         if (mos7840_port->read_urb_busy == false) {
2162                 mos7840_port->read_urb->dev = serial->dev;
2163                 mos7840_port->read_urb_busy = true;
2164                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2165                 if (status) {
2166                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2167                             status);
2168                         mos7840_port->read_urb_busy = false;
2169                 }
2170         }
2171 }
2172
2173 /*****************************************************************************
2174  * mos7840_get_lsr_info - get line status register info
2175  *
2176  * Purpose: Let user call ioctl() to get info when the UART physically
2177  *          is emptied.  On bus types like RS485, the transmitter must
2178  *          release the bus after transmitting. This must be done when
2179  *          the transmit shift register is empty, not be done when the
2180  *          transmit holding register is empty.  This functionality
2181  *          allows an RS485 driver to be written in user space.
2182  *****************************************************************************/
2183
2184 static int mos7840_get_lsr_info(struct tty_struct *tty,
2185                                 unsigned int __user *value)
2186 {
2187         int count;
2188         unsigned int result = 0;
2189
2190         count = mos7840_chars_in_buffer(tty);
2191         if (count == 0) {
2192                 dbg("%s -- Empty", __func__);
2193                 result = TIOCSER_TEMT;
2194         }
2195
2196         if (copy_to_user(value, &result, sizeof(int)))
2197                 return -EFAULT;
2198         return 0;
2199 }
2200
2201 /*****************************************************************************
2202  * mos7840_get_serial_info
2203  *      function to get information about serial port
2204  *****************************************************************************/
2205
2206 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2207                                    struct serial_struct __user *retinfo)
2208 {
2209         struct serial_struct tmp;
2210
2211         if (mos7840_port == NULL)
2212                 return -1;
2213
2214         if (!retinfo)
2215                 return -EFAULT;
2216
2217         memset(&tmp, 0, sizeof(tmp));
2218
2219         tmp.type = PORT_16550A;
2220         tmp.line = mos7840_port->port->serial->minor;
2221         tmp.port = mos7840_port->port->number;
2222         tmp.irq = 0;
2223         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2224         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2225         tmp.baud_base = 9600;
2226         tmp.close_delay = 5 * HZ;
2227         tmp.closing_wait = 30 * HZ;
2228
2229         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2230                 return -EFAULT;
2231         return 0;
2232 }
2233
2234 static int mos7840_get_icount(struct tty_struct *tty,
2235                         struct serial_icounter_struct *icount)
2236 {
2237         struct usb_serial_port *port = tty->driver_data;
2238         struct moschip_port *mos7840_port;
2239         struct async_icount cnow;
2240
2241         mos7840_port = mos7840_get_port_private(port);
2242         cnow = mos7840_port->icount;
2243
2244         smp_rmb();
2245         icount->cts = cnow.cts;
2246         icount->dsr = cnow.dsr;
2247         icount->rng = cnow.rng;
2248         icount->dcd = cnow.dcd;
2249         icount->rx = cnow.rx;
2250         icount->tx = cnow.tx;
2251         icount->frame = cnow.frame;
2252         icount->overrun = cnow.overrun;
2253         icount->parity = cnow.parity;
2254         icount->brk = cnow.brk;
2255         icount->buf_overrun = cnow.buf_overrun;
2256
2257         dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2258                 port->number, icount->rx, icount->tx);
2259         return 0;
2260 }
2261
2262 /*****************************************************************************
2263  * SerialIoctl
2264  *      this function handles any ioctl calls to the driver
2265  *****************************************************************************/
2266
2267 static int mos7840_ioctl(struct tty_struct *tty,
2268                          unsigned int cmd, unsigned long arg)
2269 {
2270         struct usb_serial_port *port = tty->driver_data;
2271         void __user *argp = (void __user *)arg;
2272         struct moschip_port *mos7840_port;
2273
2274         struct async_icount cnow;
2275         struct async_icount cprev;
2276
2277         if (mos7840_port_paranoia_check(port, __func__)) {
2278                 dbg("%s", "Invalid port");
2279                 return -1;
2280         }
2281
2282         mos7840_port = mos7840_get_port_private(port);
2283
2284         if (mos7840_port == NULL)
2285                 return -1;
2286
2287         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2288
2289         switch (cmd) {
2290                 /* return number of bytes available */
2291
2292         case TIOCSERGETLSR:
2293                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2294                 return mos7840_get_lsr_info(tty, argp);
2295
2296         case TIOCGSERIAL:
2297                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2298                 return mos7840_get_serial_info(mos7840_port, argp);
2299
2300         case TIOCSSERIAL:
2301                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2302                 break;
2303
2304         case TIOCMIWAIT:
2305                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2306                 cprev = mos7840_port->icount;
2307                 while (1) {
2308                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2309                         mos7840_port->delta_msr_cond = 0;
2310                         wait_event_interruptible(port->delta_msr_wait,
2311                                                  (port->serial->disconnected ||
2312                                                   mos7840_port->
2313                                                   delta_msr_cond == 1));
2314
2315                         /* see if a signal did it */
2316                         if (signal_pending(current))
2317                                 return -ERESTARTSYS;
2318
2319                         if (port->serial->disconnected)
2320                                 return -EIO;
2321
2322                         cnow = mos7840_port->icount;
2323                         smp_rmb();
2324                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2325                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2326                                 return -EIO;    /* no change => error */
2327                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2328                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2329                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2330                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2331                                 return 0;
2332                         }
2333                         cprev = cnow;
2334                 }
2335                 /* NOTREACHED */
2336                 break;
2337
2338         default:
2339                 break;
2340         }
2341         return -ENOIOCTLCMD;
2342 }
2343
2344 static int mos7840_calc_num_ports(struct usb_serial *serial)
2345 {
2346         __u16 Data = 0x00;
2347         int ret = 0;
2348         int mos7840_num_ports;
2349
2350         ret = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2351                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &Data,
2352                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2353
2354         if ((Data & 0x01) == 0) {
2355                 mos7840_num_ports = 2;
2356                 serial->num_bulk_in = 2;
2357                 serial->num_bulk_out = 2;
2358                 serial->num_ports = 2;
2359         } else {
2360                 mos7840_num_ports = 4;
2361                 serial->num_bulk_in = 4;
2362                 serial->num_bulk_out = 4;
2363                 serial->num_ports = 4;
2364         }
2365
2366         return mos7840_num_ports;
2367 }
2368
2369 /****************************************************************************
2370  * mos7840_startup
2371  ****************************************************************************/
2372
2373 static int mos7840_startup(struct usb_serial *serial)
2374 {
2375         struct moschip_port *mos7840_port;
2376         struct usb_device *dev;
2377         int i, status;
2378
2379         __u16 Data;
2380         dbg("%s", "mos7840_startup :Entering..........");
2381
2382         if (!serial) {
2383                 dbg("%s", "Invalid Handler");
2384                 return -1;
2385         }
2386
2387         if (serial->num_bulk_in < serial->num_ports ||
2388                         serial->num_bulk_out < serial->num_ports) {
2389                 dev_err(&serial->interface->dev, "missing endpoints\n");
2390                 return -ENODEV;
2391         }
2392
2393         dev = serial->dev;
2394
2395         dbg("%s", "Entering...");
2396         dbg ("mos7840_startup: serial = %p", serial);
2397
2398         /* we set up the pointers to the endpoints in the mos7840_open *
2399          * function, as the structures aren't created yet.             */
2400
2401         /* set up port private structures */
2402         for (i = 0; i < serial->num_ports; ++i) {
2403                 dbg ("mos7840_startup: configuring port %d............", i);
2404                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2405                 if (mos7840_port == NULL) {
2406                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2407                         status = -ENOMEM;
2408                         i--; /* don't follow NULL pointer cleaning up */
2409                         goto error;
2410                 }
2411
2412                 /* Initialize all port interrupt end point to port 0 int
2413                  * endpoint. Our device has only one interrupt end point
2414                  * common to all port */
2415
2416                 mos7840_port->port = serial->port[i];
2417                 mos7840_set_port_private(serial->port[i], mos7840_port);
2418                 spin_lock_init(&mos7840_port->pool_lock);
2419
2420                 /* minor is not initialised until later by
2421                  * usb-serial.c:get_free_serial() and cannot therefore be used
2422                  * to index device instances */
2423                 mos7840_port->port_num = i + 1;
2424                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2425                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2426                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2427                 dbg ("serial->minor = %d", serial->minor);
2428
2429                 if (mos7840_port->port_num == 1) {
2430                         mos7840_port->SpRegOffset = 0x0;
2431                         mos7840_port->ControlRegOffset = 0x1;
2432                         mos7840_port->DcrRegOffset = 0x4;
2433                 } else if ((mos7840_port->port_num == 2)
2434                            && (serial->num_ports == 4)) {
2435                         mos7840_port->SpRegOffset = 0x8;
2436                         mos7840_port->ControlRegOffset = 0x9;
2437                         mos7840_port->DcrRegOffset = 0x16;
2438                 } else if ((mos7840_port->port_num == 2)
2439                            && (serial->num_ports == 2)) {
2440                         mos7840_port->SpRegOffset = 0xa;
2441                         mos7840_port->ControlRegOffset = 0xb;
2442                         mos7840_port->DcrRegOffset = 0x19;
2443                 } else if ((mos7840_port->port_num == 3)
2444                            && (serial->num_ports == 4)) {
2445                         mos7840_port->SpRegOffset = 0xa;
2446                         mos7840_port->ControlRegOffset = 0xb;
2447                         mos7840_port->DcrRegOffset = 0x19;
2448                 } else if ((mos7840_port->port_num == 4)
2449                            && (serial->num_ports == 4)) {
2450                         mos7840_port->SpRegOffset = 0xc;
2451                         mos7840_port->ControlRegOffset = 0xd;
2452                         mos7840_port->DcrRegOffset = 0x1c;
2453                 }
2454                 mos7840_dump_serial_port(mos7840_port);
2455                 mos7840_set_port_private(serial->port[i], mos7840_port);
2456
2457                 /* enable rx_disable bit in control register */
2458                 status = mos7840_get_reg_sync(serial->port[i],
2459                                  mos7840_port->ControlRegOffset, &Data);
2460                 if (status < 0) {
2461                         dbg("Reading ControlReg failed status-0x%x", status);
2462                         break;
2463                 } else
2464                         dbg("ControlReg Reading success val is %x, status%d",
2465                             Data, status);
2466                 Data |= 0x08;   /* setting driver done bit */
2467                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2468                                    modem status reg */
2469
2470                 /* Data |= 0x20; //rx_disable bit */
2471                 status = mos7840_set_reg_sync(serial->port[i],
2472                                          mos7840_port->ControlRegOffset, Data);
2473                 if (status < 0) {
2474                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2475                         break;
2476                 } else
2477                         dbg("ControlReg Writing success(rx_disable) status%d",
2478                             status);
2479
2480                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2481                    and 0x24 in DCR3 */
2482                 Data = 0x01;
2483                 status = mos7840_set_reg_sync(serial->port[i],
2484                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2485                 if (status < 0) {
2486                         dbg("Writing DCR0 failed status-0x%x", status);
2487                         break;
2488                 } else
2489                         dbg("DCR0 Writing success status%d", status);
2490
2491                 Data = 0x05;
2492                 status = mos7840_set_reg_sync(serial->port[i],
2493                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2494                 if (status < 0) {
2495                         dbg("Writing DCR1 failed status-0x%x", status);
2496                         break;
2497                 } else
2498                         dbg("DCR1 Writing success status%d", status);
2499
2500                 Data = 0x24;
2501                 status = mos7840_set_reg_sync(serial->port[i],
2502                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2503                 if (status < 0) {
2504                         dbg("Writing DCR2 failed status-0x%x", status);
2505                         break;
2506                 } else
2507                         dbg("DCR2 Writing success status%d", status);
2508
2509                 /* write values in clkstart0x0 and clkmulti 0x20 */
2510                 Data = 0x0;
2511                 status = mos7840_set_reg_sync(serial->port[i],
2512                                          CLK_START_VALUE_REGISTER, Data);
2513                 if (status < 0) {
2514                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2515                         break;
2516                 } else
2517                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2518
2519                 Data = 0x20;
2520                 status = mos7840_set_reg_sync(serial->port[i],
2521                                         CLK_MULTI_REGISTER, Data);
2522                 if (status < 0) {
2523                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2524                             status);
2525                         goto error;
2526                 } else
2527                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2528                             status);
2529
2530                 /* write value 0x0 to scratchpad register */
2531                 Data = 0x00;
2532                 status = mos7840_set_uart_reg(serial->port[i],
2533                                                 SCRATCH_PAD_REGISTER, Data);
2534                 if (status < 0) {
2535                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2536                             status);
2537                         break;
2538                 } else
2539                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2540                             status);
2541
2542                 /* Zero Length flag register */
2543                 if ((mos7840_port->port_num != 1)
2544                     && (serial->num_ports == 2)) {
2545
2546                         Data = 0xff;
2547                         status = mos7840_set_reg_sync(serial->port[i],
2548                                       (__u16) (ZLP_REG1 +
2549                                       ((__u16)mos7840_port->port_num)), Data);
2550                         dbg("ZLIP offset %x",
2551                             (__u16) (ZLP_REG1 +
2552                                         ((__u16) mos7840_port->port_num)));
2553                         if (status < 0) {
2554                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2555                                     i + 2, status);
2556                                 break;
2557                         } else
2558                                 dbg("ZLP_REG%d Writing success status%d",
2559                                     i + 2, status);
2560                 } else {
2561                         Data = 0xff;
2562                         status = mos7840_set_reg_sync(serial->port[i],
2563                               (__u16) (ZLP_REG1 +
2564                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2565                         dbg("ZLIP offset %x",
2566                             (__u16) (ZLP_REG1 +
2567                                      ((__u16) mos7840_port->port_num) - 0x1));
2568                         if (status < 0) {
2569                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2570                                     i + 1, status);
2571                                 break;
2572                         } else
2573                                 dbg("ZLP_REG%d Writing success status%d",
2574                                     i + 1, status);
2575
2576                 }
2577                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2578                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2579                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2580                                                                 GFP_KERNEL);
2581                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2582                                                         !mos7840_port->dr) {
2583                         status = -ENOMEM;
2584                         goto error;
2585                 }
2586         }
2587         dbg ("mos7840_startup: all ports configured...........");
2588
2589         /* Zero Length flag enable */
2590         Data = 0x0f;
2591         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2592         if (status < 0) {
2593                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2594                 goto error;
2595         } else
2596                 dbg("ZLP_REG5 Writing success status%d", status);
2597
2598         /* setting configuration feature to one */
2599         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2600                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2601         return 0;
2602 error:
2603         for (/* nothing */; i >= 0; i--) {
2604                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2605
2606                 kfree(mos7840_port->dr);
2607                 kfree(mos7840_port->ctrl_buf);
2608                 usb_free_urb(mos7840_port->control_urb);
2609                 kfree(mos7840_port);
2610         }
2611         return status;
2612 }
2613
2614 /****************************************************************************
2615  * mos7840_disconnect
2616  *      This function is called whenever the device is removed from the usb bus.
2617  ****************************************************************************/
2618
2619 static void mos7840_disconnect(struct usb_serial *serial)
2620 {
2621         int i;
2622         struct moschip_port *mos7840_port;
2623         dbg("%s", " disconnect :entering..........");
2624
2625         if (!serial) {
2626                 dbg("%s", "Invalid Handler");
2627                 return;
2628         }
2629
2630         /* check for the ports to be closed,close the ports and disconnect */
2631
2632         /* free private structure allocated for serial port  *
2633          * stop reads and writes on all ports                */
2634
2635         for (i = 0; i < serial->num_ports; ++i) {
2636                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2637                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2638                 if (mos7840_port) {
2639                         usb_kill_urb(mos7840_port->control_urb);
2640                 }
2641         }
2642
2643         dbg("%s", "Thank u :: ");
2644
2645 }
2646
2647 /****************************************************************************
2648  * mos7840_release
2649  *      This function is called when the usb_serial structure is freed.
2650  ****************************************************************************/
2651
2652 static void mos7840_release(struct usb_serial *serial)
2653 {
2654         int i;
2655         struct moschip_port *mos7840_port;
2656         dbg("%s", " release :entering..........");
2657
2658         if (!serial) {
2659                 dbg("%s", "Invalid Handler");
2660                 return;
2661         }
2662
2663         /* check for the ports to be closed,close the ports and disconnect */
2664
2665         /* free private structure allocated for serial port  *
2666          * stop reads and writes on all ports                */
2667
2668         for (i = 0; i < serial->num_ports; ++i) {
2669                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2670                 dbg("mos7840_port %d = %p", i, mos7840_port);
2671                 if (mos7840_port) {
2672                         usb_free_urb(mos7840_port->control_urb);
2673                         kfree(mos7840_port->ctrl_buf);
2674                         kfree(mos7840_port->dr);
2675                         kfree(mos7840_port);
2676                 }
2677         }
2678
2679         dbg("%s", "Thank u :: ");
2680
2681 }
2682
2683 static struct usb_driver io_driver = {
2684         .name = "mos7840",
2685         .probe = usb_serial_probe,
2686         .disconnect = usb_serial_disconnect,
2687         .id_table = moschip_id_table_combined,
2688         .no_dynamic_id = 1,
2689 };
2690
2691 static struct usb_serial_driver moschip7840_4port_device = {
2692         .driver = {
2693                    .owner = THIS_MODULE,
2694                    .name = "mos7840",
2695                    },
2696         .description = DRIVER_DESC,
2697         .usb_driver = &io_driver,
2698         .id_table = moschip_port_id_table,
2699         .num_ports = 4,
2700         .open = mos7840_open,
2701         .close = mos7840_close,
2702         .write = mos7840_write,
2703         .write_room = mos7840_write_room,
2704         .chars_in_buffer = mos7840_chars_in_buffer,
2705         .throttle = mos7840_throttle,
2706         .unthrottle = mos7840_unthrottle,
2707         .calc_num_ports = mos7840_calc_num_ports,
2708 #ifdef MCSSerialProbe
2709         .probe = mos7840_serial_probe,
2710 #endif
2711         .ioctl = mos7840_ioctl,
2712         .set_termios = mos7840_set_termios,
2713         .break_ctl = mos7840_break,
2714         .tiocmget = mos7840_tiocmget,
2715         .tiocmset = mos7840_tiocmset,
2716         .get_icount = mos7840_get_icount,
2717         .attach = mos7840_startup,
2718         .disconnect = mos7840_disconnect,
2719         .release = mos7840_release,
2720         .read_bulk_callback = mos7840_bulk_in_callback,
2721         .read_int_callback = mos7840_interrupt_callback,
2722 };
2723
2724 /****************************************************************************
2725  * moschip7840_init
2726  *      This is called by the module subsystem, or on startup to initialize us
2727  ****************************************************************************/
2728 static int __init moschip7840_init(void)
2729 {
2730         int retval;
2731
2732         dbg("%s", " mos7840_init :entering..........");
2733
2734         /* Register with the usb serial */
2735         retval = usb_serial_register(&moschip7840_4port_device);
2736
2737         if (retval)
2738                 goto failed_port_device_register;
2739
2740         dbg("%s", "Entering...");
2741         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2742                DRIVER_DESC "\n");
2743
2744         /* Register with the usb */
2745         retval = usb_register(&io_driver);
2746         if (retval == 0) {
2747                 dbg("%s", "Leaving...");
2748                 return 0;
2749         }
2750         usb_serial_deregister(&moschip7840_4port_device);
2751 failed_port_device_register:
2752         return retval;
2753 }
2754
2755 /****************************************************************************
2756  * moschip7840_exit
2757  *      Called when the driver is about to be unloaded.
2758  ****************************************************************************/
2759 static void __exit moschip7840_exit(void)
2760 {
2761
2762         dbg("%s", " mos7840_exit :entering..........");
2763
2764         usb_deregister(&io_driver);
2765
2766         usb_serial_deregister(&moschip7840_4port_device);
2767
2768         dbg("%s", "Entering...");
2769 }
2770
2771 module_init(moschip7840_init);
2772 module_exit(moschip7840_exit);
2773
2774 /* Module information */
2775 MODULE_DESCRIPTION(DRIVER_DESC);
2776 MODULE_LICENSE("GPL");
2777
2778 module_param(debug, bool, S_IRUGO | S_IWUSR);
2779 MODULE_PARM_DESC(debug, "Debug enabled or not");