Pileus Git - ~andy/linux/blob - drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.2"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 106 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 /* The native mos7840/7820 component */
 114 #define USB_VENDOR_ID_MOSCHIP           0x9710
 115 #define MOSCHIP_DEVICE_ID_7840          0x7840
 116 #define MOSCHIP_DEVICE_ID_7820          0x7820
 117 #define MOSCHIP_DEVICE_ID_7810          0x7810
 118 /* The native component can have its vendor/device id's overridden
 119  * in vendor-specific implementations.  Such devices can be handled
 120  * by making a change here, in id_table.
 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 /* LED on/off milliseconds*/
 188 #define LED_ON_MS       500
 189 #define LED_OFF_MS      500
 190
 191 static int device_type;
 192
 193 static const struct usb_device_id id_table[] = {
 194         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 195         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 196         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 208         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 209         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 210         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 211         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 212         {}                      /* terminating entry */
 213 };
 214 MODULE_DEVICE_TABLE(usb, id_table);
 215
 216 /* This structure holds all of the local port information */
 217
 218 struct moschip_port {
 219         int port_num;           /*Actual port number in the device(1,2,etc) */
 220         struct urb *write_urb;  /* write URB for this port */
 221         struct urb *read_urb;   /* read URB for this port */
 222         struct urb *int_urb;
 223         __u8 shadowLCR;         /* last LCR value received */
 224         __u8 shadowMCR;         /* last MCR value received */
 225         char open;
 226         char open_ports;
 227         char zombie;
 228         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 229         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 230         int delta_msr_cond;
 231         struct async_icount icount;
 232         struct usb_serial_port *port;   /* loop back to the owner of this object */
 233
 234         /* Offsets */
 235         __u8 SpRegOffset;
 236         __u8 ControlRegOffset;
 237         __u8 DcrRegOffset;
 238         /* for processing control URBS in interrupt context */
 239         struct urb *control_urb;
 240         struct usb_ctrlrequest *dr;
 241         char *ctrl_buf;
 242         int MsrLsr;
 243
 244         spinlock_t pool_lock;
 245         struct urb *write_urb_pool[NUM_URBS];
 246         char busy[NUM_URBS];
 247         bool read_urb_busy;
 248
 249         /* For device(s) with LED indicator */
 250         bool has_led;
 251         bool led_flag;
 252         struct timer_list led_timer1;   /* Timer for LED on */
 253         struct timer_list led_timer2;   /* Timer for LED off */
 254 };
 255
 256 static bool debug;
 257
 258 /*
 259  * mos7840_set_reg_sync
 260  *      To set the Control register by calling usb_fill_control_urb function
 261  *      by passing usb_sndctrlpipe function as parameter.
 262  */
 263
 264 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 265                                 __u16 val)
 266 {
 267         struct usb_device *dev = port->serial->dev;
 268         val = val & 0x00ff;
 269         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 270
 271         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 272                                MCS_WR_RTYPE, val, reg, NULL, 0,
 273                                MOS_WDR_TIMEOUT);
 274 }
 275
 276 /*
 277  * mos7840_get_reg_sync
 278  *      To set the Uart register by calling usb_fill_control_urb function by
 279  *      passing usb_rcvctrlpipe function as parameter.
 280  */
 281
 282 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 283                                 __u16 *val)
 284 {
 285         struct usb_device *dev = port->serial->dev;
 286         int ret = 0;
 287         u8 *buf;
 288
 289         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 290         if (!buf)
 291                 return -ENOMEM;
 292
 293         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 294                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 295                               MOS_WDR_TIMEOUT);
 296         *val = buf[0];
 297         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 298
 299         kfree(buf);
 300         return ret;
 301 }
 302
 303 /*
 304  * mos7840_set_uart_reg
 305  *      To set the Uart register by calling usb_fill_control_urb function by
 306  *      passing usb_sndctrlpipe function as parameter.
 307  */
 308
 309 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 310                                 __u16 val)
 311 {
 312
 313         struct usb_device *dev = port->serial->dev;
 314         val = val & 0x00ff;
 315         /* For the UART control registers, the application number need
 316            to be Or'ed */
 317         if (port->serial->num_ports == 4) {
 318                 val |= (((__u16) port->number -
 319                                 (__u16) (port->serial->minor)) + 1) << 8;
 320                 dbg("mos7840_set_uart_reg application number is %x", val);
 321         } else {
 322                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 323                         val |= (((__u16) port->number -
 324                               (__u16) (port->serial->minor)) + 1) << 8;
 325                         dbg("mos7840_set_uart_reg application number is %x",
 326                             val);
 327                 } else {
 328                         val |=
 329                             (((__u16) port->number -
 330                               (__u16) (port->serial->minor)) + 2) << 8;
 331                         dbg("mos7840_set_uart_reg application number is %x",
 332                             val);
 333                 }
 334         }
 335         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 336                                MCS_WR_RTYPE, val, reg, NULL, 0,
 337                                MOS_WDR_TIMEOUT);
 338
 339 }
 340
 341 /*
 342  * mos7840_get_uart_reg
 343  *      To set the Control register by calling usb_fill_control_urb function
 344  *      by passing usb_rcvctrlpipe function as parameter.
 345  */
 346 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 347                                 __u16 *val)
 348 {
 349         struct usb_device *dev = port->serial->dev;
 350         int ret = 0;
 351         __u16 Wval;
 352         u8 *buf;
 353
 354         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 355         if (!buf)
 356                 return -ENOMEM;
 357
 358         /* dbg("application number is %4x",
 359             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 360         /* Wval  is same as application number */
 361         if (port->serial->num_ports == 4) {
 362                 Wval =
 363                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 364                      1) << 8;
 365                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 366         } else {
 367                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 368                         Wval = (((__u16) port->number -
 369                               (__u16) (port->serial->minor)) + 1) << 8;
 370                         dbg("mos7840_get_uart_reg application number is %x",
 371                             Wval);
 372                 } else {
 373                         Wval = (((__u16) port->number -
 374                               (__u16) (port->serial->minor)) + 2) << 8;
 375                         dbg("mos7840_get_uart_reg application number is %x",
 376                             Wval);
 377                 }
 378         }
 379         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 380                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 381                               MOS_WDR_TIMEOUT);
 382         *val = buf[0];
 383
 384         kfree(buf);
 385         return ret;
 386 }
 387
 388 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 389 {
 390
 391         dbg("***************************************");
 392         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 393         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 394         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 395         dbg("***************************************");
 396
 397 }
 398
 399 /************************************************************************/
 400 /************************************************************************/
 401 /*             I N T E R F A C E   F U N C T I O N S                    */
 402 /*             I N T E R F A C E   F U N C T I O N S                    */
 403 /************************************************************************/
 404 /************************************************************************/
 405
 406 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 407                                             struct moschip_port *data)
 408 {
 409         usb_set_serial_port_data(port, (void *)data);
 410 }
 411
 412 static inline struct moschip_port *mos7840_get_port_private(struct
 413                                                             usb_serial_port
 414                                                             *port)
 415 {
 416         return (struct moschip_port *)usb_get_serial_port_data(port);
 417 }
 418
 419 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 420 {
 421         struct moschip_port *mos7840_port;
 422         struct async_icount *icount;
 423         mos7840_port = port;
 424         icount = &mos7840_port->icount;
 425         if (new_msr &
 426             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 427              MOS_MSR_DELTA_CD)) {
 428                 icount = &mos7840_port->icount;
 429
 430                 /* update input line counters */
 431                 if (new_msr & MOS_MSR_DELTA_CTS) {
 432                         icount->cts++;
 433                         smp_wmb();
 434                 }
 435                 if (new_msr & MOS_MSR_DELTA_DSR) {
 436                         icount->dsr++;
 437                         smp_wmb();
 438                 }
 439                 if (new_msr & MOS_MSR_DELTA_CD) {
 440                         icount->dcd++;
 441                         smp_wmb();
 442                 }
 443                 if (new_msr & MOS_MSR_DELTA_RI) {
 444                         icount->rng++;
 445                         smp_wmb();
 446                 }
 447         }
 448 }
 449
 450 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 451 {
 452         struct async_icount *icount;
 453
 454         dbg("%s - %02x", __func__, new_lsr);
 455
 456         if (new_lsr & SERIAL_LSR_BI) {
 457                 /*
 458                  * Parity and Framing errors only count if they
 459                  * occur exclusive of a break being
 460                  * received.
 461                  */
 462                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 463         }
 464
 465         /* update input line counters */
 466         icount = &port->icount;
 467         if (new_lsr & SERIAL_LSR_BI) {
 468                 icount->brk++;
 469                 smp_wmb();
 470         }
 471         if (new_lsr & SERIAL_LSR_OE) {
 472                 icount->overrun++;
 473                 smp_wmb();
 474         }
 475         if (new_lsr & SERIAL_LSR_PE) {
 476                 icount->parity++;
 477                 smp_wmb();
 478         }
 479         if (new_lsr & SERIAL_LSR_FE) {
 480                 icount->frame++;
 481                 smp_wmb();
 482         }
 483 }
 484
 485 /************************************************************************/
 486 /************************************************************************/
 487 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 488 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 489 /************************************************************************/
 490 /************************************************************************/
 491
 492 static void mos7840_control_callback(struct urb *urb)
 493 {
 494         unsigned char *data;
 495         struct moschip_port *mos7840_port;
 496         __u8 regval = 0x0;
 497         int result = 0;
 498         int status = urb->status;
 499
 500         mos7840_port = urb->context;
 501
 502         switch (status) {
 503         case 0:
 504                 /* success */
 505                 break;
 506         case -ECONNRESET:
 507         case -ENOENT:
 508         case -ESHUTDOWN:
 509                 /* this urb is terminated, clean up */
 510                 dbg("%s - urb shutting down with status: %d", __func__,
 511                     status);
 512                 return;
 513         default:
 514                 dbg("%s - nonzero urb status received: %d", __func__,
 515                     status);
 516                 goto exit;
 517         }
 518
 519         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 520         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 521             mos7840_port->MsrLsr, mos7840_port->port_num);
 522         data = urb->transfer_buffer;
 523         regval = (__u8) data[0];
 524         dbg("%s data is %x", __func__, regval);
 525         if (mos7840_port->MsrLsr == 0)
 526                 mos7840_handle_new_msr(mos7840_port, regval);
 527         else if (mos7840_port->MsrLsr == 1)
 528                 mos7840_handle_new_lsr(mos7840_port, regval);
 529
 530 exit:
 531         spin_lock(&mos7840_port->pool_lock);
 532         if (!mos7840_port->zombie)
 533                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 534         spin_unlock(&mos7840_port->pool_lock);
 535         if (result) {
 536                 dev_err(&urb->dev->dev,
 537                         "%s - Error %d submitting interrupt urb\n",
 538                         __func__, result);
 539         }
 540 }
 541
 542 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 543                            __u16 *val)
 544 {
 545         struct usb_device *dev = mcs->port->serial->dev;
 546         struct usb_ctrlrequest *dr = mcs->dr;
 547         unsigned char *buffer = mcs->ctrl_buf;
 548         int ret;
 549
 550         dr->bRequestType = MCS_RD_RTYPE;
 551         dr->bRequest = MCS_RDREQ;
 552         dr->wValue = cpu_to_le16(Wval); /* 0 */
 553         dr->wIndex = cpu_to_le16(reg);
 554         dr->wLength = cpu_to_le16(2);
 555
 556         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 557                              (unsigned char *)dr, buffer, 2,
 558                              mos7840_control_callback, mcs);
 559         mcs->control_urb->transfer_buffer_length = 2;
 560         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 561         return ret;
 562 }
 563
 564 static void mos7840_set_led_callback(struct urb *urb)
 565 {
 566         switch (urb->status) {
 567         case 0:
 568                 /* Success */
 569                 break;
 570         case -ECONNRESET:
 571         case -ENOENT:
 572         case -ESHUTDOWN:
 573                 /* This urb is terminated, clean up */
 574                 dbg("%s - urb shutting down with status: %d", __func__,
 575                         urb->status);
 576                 break;
 577         default:
 578                 dbg("%s - nonzero urb status received: %d", __func__,
 579                         urb->status);
 580         }
 581 }
 582
 583 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 584                                 __u16 reg)
 585 {
 586         struct usb_device *dev = mcs->port->serial->dev;
 587         struct usb_ctrlrequest *dr = mcs->dr;
 588
 589         dr->bRequestType = MCS_WR_RTYPE;
 590         dr->bRequest = MCS_WRREQ;
 591         dr->wValue = cpu_to_le16(wval);
 592         dr->wIndex = cpu_to_le16(reg);
 593         dr->wLength = cpu_to_le16(0);
 594
 595         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 596                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 597
 598         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 599 }
 600
 601 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 602                                 __u16 val)
 603 {
 604         struct usb_device *dev = port->serial->dev;
 605
 606         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 607                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 608 }
 609
 610 static void mos7840_led_off(unsigned long arg)
 611 {
 612         struct moschip_port *mcs = (struct moschip_port *) arg;
 613
 614         /* Turn off LED */
 615         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 616         mod_timer(&mcs->led_timer2,
 617                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 618 }
 619
 620 static void mos7840_led_flag_off(unsigned long arg)
 621 {
 622         struct moschip_port *mcs = (struct moschip_port *) arg;
 623
 624         mcs->led_flag = false;
 625 }
 626
 627 /*****************************************************************************
 628  * mos7840_interrupt_callback
 629  *      this is the callback function for when we have received data on the
 630  *      interrupt endpoint.
 631  *****************************************************************************/
 632
 633 static void mos7840_interrupt_callback(struct urb *urb)
 634 {
 635         int result;
 636         int length;
 637         struct moschip_port *mos7840_port;
 638         struct usb_serial *serial;
 639         __u16 Data;
 640         unsigned char *data;
 641         __u8 sp[5], st;
 642         int i, rv = 0;
 643         __u16 wval, wreg = 0;
 644         int status = urb->status;
 645
 646         switch (status) {
 647         case 0:
 648                 /* success */
 649                 break;
 650         case -ECONNRESET:
 651         case -ENOENT:
 652         case -ESHUTDOWN:
 653                 /* this urb is terminated, clean up */
 654                 dbg("%s - urb shutting down with status: %d", __func__,
 655                     status);
 656                 return;
 657         default:
 658                 dbg("%s - nonzero urb status received: %d", __func__,
 659                     status);
 660                 goto exit;
 661         }
 662
 663         length = urb->actual_length;
 664         data = urb->transfer_buffer;
 665
 666         serial = urb->context;
 667
 668         /* Moschip get 5 bytes
 669          * Byte 1 IIR Port 1 (port.number is 0)
 670          * Byte 2 IIR Port 2 (port.number is 1)
 671          * Byte 3 IIR Port 3 (port.number is 2)
 672          * Byte 4 IIR Port 4 (port.number is 3)
 673          * Byte 5 FIFO status for both */
 674
 675         if (length && length > 5) {
 676                 dbg("%s", "Wrong data !!!");
 677                 return;
 678         }
 679
 680         sp[0] = (__u8) data[0];
 681         sp[1] = (__u8) data[1];
 682         sp[2] = (__u8) data[2];
 683         sp[3] = (__u8) data[3];
 684         st = (__u8) data[4];
 685
 686         for (i = 0; i < serial->num_ports; i++) {
 687                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 688                 wval =
 689                     (((__u16) serial->port[i]->number -
 690                       (__u16) (serial->minor)) + 1) << 8;
 691                 if (mos7840_port->open) {
 692                         if (sp[i] & 0x01) {
 693                                 dbg("SP%d No Interrupt !!!", i);
 694                         } else {
 695                                 switch (sp[i] & 0x0f) {
 696                                 case SERIAL_IIR_RLS:
 697                                         dbg("Serial Port %d: Receiver status error or ", i);
 698                                         dbg("address bit detected in 9-bit mode");
 699                                         mos7840_port->MsrLsr = 1;
 700                                         wreg = LINE_STATUS_REGISTER;
 701                                         break;
 702                                 case SERIAL_IIR_MS:
 703                                         dbg("Serial Port %d: Modem status change", i);
 704                                         mos7840_port->MsrLsr = 0;
 705                                         wreg = MODEM_STATUS_REGISTER;
 706                                         break;
 707                                 }
 708                                 spin_lock(&mos7840_port->pool_lock);
 709                                 if (!mos7840_port->zombie) {
 710                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 711                                 } else {
 712                                         spin_unlock(&mos7840_port->pool_lock);
 713                                         return;
 714                                 }
 715                                 spin_unlock(&mos7840_port->pool_lock);
 716                         }
 717                 }
 718         }
 719         if (!(rv < 0))
 720                 /* the completion handler for the control urb will resubmit */
 721                 return;
 722 exit:
 723         result = usb_submit_urb(urb, GFP_ATOMIC);
 724         if (result) {
 725                 dev_err(&urb->dev->dev,
 726                         "%s - Error %d submitting interrupt urb\n",
 727                         __func__, result);
 728         }
 729 }
 730
 731 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 732                                        const char *function)
 733 {
 734         if (!port) {
 735                 dbg("%s - port == NULL", function);
 736                 return -1;
 737         }
 738         if (!port->serial) {
 739                 dbg("%s - port->serial == NULL", function);
 740                 return -1;
 741         }
 742
 743         return 0;
 744 }
 745
 746 /* Inline functions to check the sanity of a pointer that is passed to us */
 747 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 748                                          const char *function)
 749 {
 750         if (!serial) {
 751                 dbg("%s - serial == NULL", function);
 752                 return -1;
 753         }
 754         if (!serial->type) {
 755                 dbg("%s - serial->type == NULL!", function);
 756                 return -1;
 757         }
 758
 759         return 0;
 760 }
 761
 762 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 763                                                  const char *function)
 764 {
 765         /* if no port was specified, or it fails a paranoia check */
 766         if (!port ||
 767             mos7840_port_paranoia_check(port, function) ||
 768             mos7840_serial_paranoia_check(port->serial, function)) {
 769                 /* then say that we don't have a valid usb_serial thing,
 770                  * which will end up genrating -ENODEV return values */
 771                 return NULL;
 772         }
 773
 774         return port->serial;
 775 }
 776
 777 /*****************************************************************************
 778  * mos7840_bulk_in_callback
 779  *      this is the callback function for when we have received data on the
 780  *      bulk in endpoint.
 781  *****************************************************************************/
 782
 783 static void mos7840_bulk_in_callback(struct urb *urb)
 784 {
 785         int retval;
 786         unsigned char *data;
 787         struct usb_serial *serial;
 788         struct usb_serial_port *port;
 789         struct moschip_port *mos7840_port;
 790         struct tty_struct *tty;
 791         int status = urb->status;
 792
 793         mos7840_port = urb->context;
 794         if (!mos7840_port) {
 795                 dbg("%s", "NULL mos7840_port pointer");
 796                 return;
 797         }
 798
 799         if (status) {
 800                 dbg("nonzero read bulk status received: %d", status);
 801                 mos7840_port->read_urb_busy = false;
 802                 return;
 803         }
 804
 805         port = (struct usb_serial_port *)mos7840_port->port;
 806         if (mos7840_port_paranoia_check(port, __func__)) {
 807                 dbg("%s", "Port Paranoia failed");
 808                 mos7840_port->read_urb_busy = false;
 809                 return;
 810         }
 811
 812         serial = mos7840_get_usb_serial(port, __func__);
 813         if (!serial) {
 814                 dbg("%s", "Bad serial pointer");
 815                 mos7840_port->read_urb_busy = false;
 816                 return;
 817         }
 818
 819         data = urb->transfer_buffer;
 820
 821         if (urb->actual_length) {
 822                 tty = tty_port_tty_get(&mos7840_port->port->port);
 823                 if (tty) {
 824                         tty_insert_flip_string(tty, data, urb->actual_length);
 825                         dbg(" %s ", data);
 826                         tty_flip_buffer_push(tty);
 827                         tty_kref_put(tty);
 828                 }
 829                 mos7840_port->icount.rx += urb->actual_length;
 830                 smp_wmb();
 831                 dbg("mos7840_port->icount.rx is %d:",
 832                     mos7840_port->icount.rx);
 833         }
 834
 835         if (!mos7840_port->read_urb) {
 836                 dbg("%s", "URB KILLED !!!");
 837                 mos7840_port->read_urb_busy = false;
 838                 return;
 839         }
 840
 841         /* Turn on LED */
 842         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 843                 mos7840_port->led_flag = true;
 844                 mos7840_set_led_async(mos7840_port, 0x0301,
 845                                         MODEM_CONTROL_REGISTER);
 846                 mod_timer(&mos7840_port->led_timer1,
 847                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 848         }
 849
 850         mos7840_port->read_urb_busy = true;
 851         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 852
 853         if (retval) {
 854                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 855                 mos7840_port->read_urb_busy = false;
 856         }
 857 }
 858
 859 /*****************************************************************************
 860  * mos7840_bulk_out_data_callback
 861  *      this is the callback function for when we have finished sending
 862  *      serial data on the bulk out endpoint.
 863  *****************************************************************************/
 864
 865 static void mos7840_bulk_out_data_callback(struct urb *urb)
 866 {
 867         struct moschip_port *mos7840_port;
 868         struct tty_struct *tty;
 869         int status = urb->status;
 870         int i;
 871
 872         mos7840_port = urb->context;
 873         spin_lock(&mos7840_port->pool_lock);
 874         for (i = 0; i < NUM_URBS; i++) {
 875                 if (urb == mos7840_port->write_urb_pool[i]) {
 876                         mos7840_port->busy[i] = 0;
 877                         break;
 878                 }
 879         }
 880         spin_unlock(&mos7840_port->pool_lock);
 881
 882         if (status) {
 883                 dbg("nonzero write bulk status received:%d", status);
 884                 return;
 885         }
 886
 887         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 888                 dbg("%s", "Port Paranoia failed");
 889                 return;
 890         }
 891
 892         tty = tty_port_tty_get(&mos7840_port->port->port);
 893         if (tty && mos7840_port->open)
 894                 tty_wakeup(tty);
 895         tty_kref_put(tty);
 896
 897 }
 898
 899 /************************************************************************/
 900 /*       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       */
 901 /************************************************************************/
 902 #ifdef MCSSerialProbe
 903 static int mos7840_serial_probe(struct usb_serial *serial,
 904                                 const struct usb_device_id *id)
 905 {
 906
 907         /*need to implement the mode_reg reading and updating\
 908            structures usb_serial_ device_type\
 909            (i.e num_ports, num_bulkin,bulkout etc) */
 910         /* Also we can update the changes  attach */
 911         return 1;
 912 }
 913 #endif
 914
 915 /*****************************************************************************
 916  * mos7840_open
 917  *      this function is called by the tty driver when a port is opened
 918  *      If successful, we return 0
 919  *      Otherwise we return a negative error number.
 920  *****************************************************************************/
 921
 922 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 923 {
 924         int response;
 925         int j;
 926         struct usb_serial *serial;
 927         struct urb *urb;
 928         __u16 Data;
 929         int status;
 930         struct moschip_port *mos7840_port;
 931         struct moschip_port *port0;
 932
 933         if (mos7840_port_paranoia_check(port, __func__)) {
 934                 dbg("%s", "Port Paranoia failed");
 935                 return -ENODEV;
 936         }
 937
 938         serial = port->serial;
 939
 940         if (mos7840_serial_paranoia_check(serial, __func__)) {
 941                 dbg("%s", "Serial Paranoia failed");
 942                 return -ENODEV;
 943         }
 944
 945         mos7840_port = mos7840_get_port_private(port);
 946         port0 = mos7840_get_port_private(serial->port[0]);
 947
 948         if (mos7840_port == NULL || port0 == NULL)
 949                 return -ENODEV;
 950
 951         usb_clear_halt(serial->dev, port->write_urb->pipe);
 952         usb_clear_halt(serial->dev, port->read_urb->pipe);
 953         port0->open_ports++;
 954
 955         /* Initialising the write urb pool */
 956         for (j = 0; j < NUM_URBS; ++j) {
 957                 urb = usb_alloc_urb(0, GFP_KERNEL);
 958                 mos7840_port->write_urb_pool[j] = urb;
 959
 960                 if (urb == NULL) {
 961                         dev_err(&port->dev, "No more urbs???\n");
 962                         continue;
 963                 }
 964
 965                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 966                                                                 GFP_KERNEL);
 967                 if (!urb->transfer_buffer) {
 968                         usb_free_urb(urb);
 969                         mos7840_port->write_urb_pool[j] = NULL;
 970                         dev_err(&port->dev,
 971                                 "%s-out of memory for urb buffers.\n",
 972                                 __func__);
 973                         continue;
 974                 }
 975         }
 976
 977 /*****************************************************************************
 978  * Initialize MCS7840 -- Write Init values to corresponding Registers
 979  *
 980  * Register Index
 981  * 1 : IER
 982  * 2 : FCR
 983  * 3 : LCR
 984  * 4 : MCR
 985  *
 986  * 0x08 : SP1/2 Control Reg
 987  *****************************************************************************/
 988
 989         /* NEED to check the following Block */
 990
 991         Data = 0x0;
 992         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 993         if (status < 0) {
 994                 dbg("Reading Spreg failed");
 995                 return -1;
 996         }
 997         Data |= 0x80;
 998         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 999         if (status < 0) {
1000                 dbg("writing Spreg failed");
1001                 return -1;
1002         }
1003
1004         Data &= ~0x80;
1005         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1006         if (status < 0) {
1007                 dbg("writing Spreg failed");
1008                 return -1;
1009         }
1010         /* End of block to be checked */
1011
1012         Data = 0x0;
1013         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1014                                                                         &Data);
1015         if (status < 0) {
1016                 dbg("Reading Controlreg failed");
1017                 return -1;
1018         }
1019         Data |= 0x08;           /* Driver done bit */
1020         Data |= 0x20;           /* rx_disable */
1021         status = mos7840_set_reg_sync(port,
1022                                 mos7840_port->ControlRegOffset, Data);
1023         if (status < 0) {
1024                 dbg("writing Controlreg failed");
1025                 return -1;
1026         }
1027         /* do register settings here */
1028         /* Set all regs to the device default values. */
1029         /***********************************
1030          * First Disable all interrupts.
1031          ***********************************/
1032         Data = 0x00;
1033         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1034         if (status < 0) {
1035                 dbg("disabling interrupts failed");
1036                 return -1;
1037         }
1038         /* Set FIFO_CONTROL_REGISTER to the default value */
1039         Data = 0x00;
1040         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1041         if (status < 0) {
1042                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
1043                 return -1;
1044         }
1045
1046         Data = 0xcf;
1047         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1048         if (status < 0) {
1049                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
1050                 return -1;
1051         }
1052
1053         Data = 0x03;
1054         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1055         mos7840_port->shadowLCR = Data;
1056
1057         Data = 0x0b;
1058         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1059         mos7840_port->shadowMCR = Data;
1060
1061         Data = 0x00;
1062         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1063         mos7840_port->shadowLCR = Data;
1064
1065         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1066         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1067
1068         Data = 0x0c;
1069         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1070
1071         Data = 0x0;
1072         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1073
1074         Data = 0x00;
1075         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1076
1077         Data = Data & ~SERIAL_LCR_DLAB;
1078         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1079         mos7840_port->shadowLCR = Data;
1080
1081         /* clearing Bulkin and Bulkout Fifo */
1082         Data = 0x0;
1083         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1084
1085         Data = Data | 0x0c;
1086         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1087
1088         Data = Data & ~0x0c;
1089         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1090         /* Finally enable all interrupts */
1091         Data = 0x0c;
1092         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1093
1094         /* clearing rx_disable */
1095         Data = 0x0;
1096         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1097                                                                         &Data);
1098         Data = Data & ~0x20;
1099         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1100                                                                         Data);
1101
1102         /* rx_negate */
1103         Data = 0x0;
1104         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1105                                                                         &Data);
1106         Data = Data | 0x10;
1107         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1108                                                                         Data);
1109
1110         /* Check to see if we've set up our endpoint info yet    *
1111          * (can't set it up in mos7840_startup as the structures *
1112          * were not set up at that time.)                        */
1113         if (port0->open_ports == 1) {
1114                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1115                         /* set up interrupt urb */
1116                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1117                                 serial->dev,
1118                                 usb_rcvintpipe(serial->dev,
1119                                 serial->port[0]->interrupt_in_endpointAddress),
1120                                 serial->port[0]->interrupt_in_buffer,
1121                                 serial->port[0]->interrupt_in_urb->
1122                                 transfer_buffer_length,
1123                                 mos7840_interrupt_callback,
1124                                 serial,
1125                                 serial->port[0]->interrupt_in_urb->interval);
1126
1127                         /* start interrupt read for mos7840               *
1128                          * will continue as long as mos7840 is connected  */
1129
1130                         response =
1131                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1132                                            GFP_KERNEL);
1133                         if (response) {
1134                                 dev_err(&port->dev, "%s - Error %d submitting "
1135                                         "interrupt urb\n", __func__, response);
1136                         }
1137
1138                 }
1139
1140         }
1141
1142         /* see if we've set up our endpoint info yet   *
1143          * (can't set it up in mos7840_startup as the  *
1144          * structures were not set up at that time.)   */
1145
1146         dbg("port number is %d", port->number);
1147         dbg("serial number is %d", port->serial->minor);
1148         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1149         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1150         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1151         dbg("port's number in the device is %d", mos7840_port->port_num);
1152         mos7840_port->read_urb = port->read_urb;
1153
1154         /* set up our bulk in urb */
1155         if ((serial->num_ports == 2)
1156                 && ((((__u16)port->number -
1157                         (__u16)(port->serial->minor)) % 2) != 0)) {
1158                 usb_fill_bulk_urb(mos7840_port->read_urb,
1159                         serial->dev,
1160                         usb_rcvbulkpipe(serial->dev,
1161                                 (port->bulk_in_endpointAddress) + 2),
1162                         port->bulk_in_buffer,
1163                         mos7840_port->read_urb->transfer_buffer_length,
1164                         mos7840_bulk_in_callback, mos7840_port);
1165         } else {
1166                 usb_fill_bulk_urb(mos7840_port->read_urb,
1167                         serial->dev,
1168                         usb_rcvbulkpipe(serial->dev,
1169                                 port->bulk_in_endpointAddress),
1170                         port->bulk_in_buffer,
1171                         mos7840_port->read_urb->transfer_buffer_length,
1172                         mos7840_bulk_in_callback, mos7840_port);
1173         }
1174
1175         dbg("mos7840_open: bulkin endpoint is %d",
1176             port->bulk_in_endpointAddress);
1177         mos7840_port->read_urb_busy = true;
1178         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1179         if (response) {
1180                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1181                         __func__, response);
1182                 mos7840_port->read_urb_busy = false;
1183         }
1184
1185         /* initialize our wait queues */
1186         init_waitqueue_head(&mos7840_port->wait_chase);
1187         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1188
1189         /* initialize our icount structure */
1190         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1191
1192         /* initialize our port settings */
1193         /* Must set to enable ints! */
1194         mos7840_port->shadowMCR = MCR_MASTER_IE;
1195         /* send a open port command */
1196         mos7840_port->open = 1;
1197         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1198         mos7840_port->icount.tx = 0;
1199         mos7840_port->icount.rx = 0;
1200
1201         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1202                                 serial, mos7840_port, port);
1203
1204         return 0;
1205 }
1206
1207 /*****************************************************************************
1208  * mos7840_chars_in_buffer
1209  *      this function is called by the tty driver when it wants to know how many
1210  *      bytes of data we currently have outstanding in the port (data that has
1211  *      been written, but hasn't made it out the port yet)
1212  *      If successful, we return the number of bytes left to be written in the
1213  *      system,
1214  *      Otherwise we return zero.
1215  *****************************************************************************/
1216
1217 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1218 {
1219         struct usb_serial_port *port = tty->driver_data;
1220         int i;
1221         int chars = 0;
1222         unsigned long flags;
1223         struct moschip_port *mos7840_port;
1224
1225         if (mos7840_port_paranoia_check(port, __func__)) {
1226                 dbg("%s", "Invalid port");
1227                 return 0;
1228         }
1229
1230         mos7840_port = mos7840_get_port_private(port);
1231         if (mos7840_port == NULL)
1232                 return 0;
1233
1234         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1235         for (i = 0; i < NUM_URBS; ++i)
1236                 if (mos7840_port->busy[i])
1237                         chars += URB_TRANSFER_BUFFER_SIZE;
1238         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1239         dbg("%s - returns %d", __func__, chars);
1240         return chars;
1241
1242 }
1243
1244 /*****************************************************************************
1245  * mos7840_close
1246  *      this function is called by the tty driver when a port is closed
1247  *****************************************************************************/
1248
1249 static void mos7840_close(struct usb_serial_port *port)
1250 {
1251         struct usb_serial *serial;
1252         struct moschip_port *mos7840_port;
1253         struct moschip_port *port0;
1254         int j;
1255         __u16 Data;
1256
1257         if (mos7840_port_paranoia_check(port, __func__)) {
1258                 dbg("%s", "Port Paranoia failed");
1259                 return;
1260         }
1261
1262         serial = mos7840_get_usb_serial(port, __func__);
1263         if (!serial) {
1264                 dbg("%s", "Serial Paranoia failed");
1265                 return;
1266         }
1267
1268         mos7840_port = mos7840_get_port_private(port);
1269         port0 = mos7840_get_port_private(serial->port[0]);
1270
1271         if (mos7840_port == NULL || port0 == NULL)
1272                 return;
1273
1274         for (j = 0; j < NUM_URBS; ++j)
1275                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1276
1277         /* Freeing Write URBs */
1278         for (j = 0; j < NUM_URBS; ++j) {
1279                 if (mos7840_port->write_urb_pool[j]) {
1280                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1281                                 kfree(mos7840_port->write_urb_pool[j]->
1282                                       transfer_buffer);
1283
1284                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1285                 }
1286         }
1287
1288         /* While closing port, shutdown all bulk read, write  *
1289          * and interrupt read if they exists                  */
1290         if (serial->dev) {
1291                 if (mos7840_port->write_urb) {
1292                         dbg("%s", "Shutdown bulk write");
1293                         usb_kill_urb(mos7840_port->write_urb);
1294                 }
1295                 if (mos7840_port->read_urb) {
1296                         dbg("%s", "Shutdown bulk read");
1297                         usb_kill_urb(mos7840_port->read_urb);
1298                         mos7840_port->read_urb_busy = false;
1299                 }
1300                 if ((&mos7840_port->control_urb)) {
1301                         dbg("%s", "Shutdown control read");
1302                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1303                 }
1304         }
1305 /*      if(mos7840_port->ctrl_buf != NULL) */
1306 /*              kfree(mos7840_port->ctrl_buf); */
1307         port0->open_ports--;
1308         dbg("mos7840_num_open_ports in close%d:in port%d",
1309             port0->open_ports, port->number);
1310         if (port0->open_ports == 0) {
1311                 if (serial->port[0]->interrupt_in_urb) {
1312                         dbg("%s", "Shutdown interrupt_in_urb");
1313                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1314                 }
1315         }
1316
1317         if (mos7840_port->write_urb) {
1318                 /* if this urb had a transfer buffer already (old tx) free it */
1319                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1320                         kfree(mos7840_port->write_urb->transfer_buffer);
1321                 usb_free_urb(mos7840_port->write_urb);
1322         }
1323
1324         Data = 0x0;
1325         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1326
1327         Data = 0x00;
1328         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1329
1330         mos7840_port->open = 0;
1331 }
1332
1333 /************************************************************************
1334  *
1335  * mos7840_block_until_chase_response
1336  *
1337  *      This function will block the close until one of the following:
1338  *              1. Response to our Chase comes from mos7840
1339  *              2. A timeout of 10 seconds without activity has expired
1340  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1341  *
1342  ************************************************************************/
1343
1344 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1345                                         struct moschip_port *mos7840_port)
1346 {
1347         int timeout = 1 * HZ;
1348         int wait = 10;
1349         int count;
1350
1351         while (1) {
1352                 count = mos7840_chars_in_buffer(tty);
1353
1354                 /* Check for Buffer status */
1355                 if (count <= 0)
1356                         return;
1357
1358                 /* Block the thread for a while */
1359                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1360                                                timeout);
1361                 /* No activity.. count down section */
1362                 wait--;
1363                 if (wait == 0) {
1364                         dbg("%s - TIMEOUT", __func__);
1365                         return;
1366                 } else {
1367                         /* Reset timeout value back to seconds */
1368                         wait = 10;
1369                 }
1370         }
1371
1372 }
1373
1374 /*****************************************************************************
1375  * mos7840_break
1376  *      this function sends a break to the port
1377  *****************************************************************************/
1378 static void mos7840_break(struct tty_struct *tty, int break_state)
1379 {
1380         struct usb_serial_port *port = tty->driver_data;
1381         unsigned char data;
1382         struct usb_serial *serial;
1383         struct moschip_port *mos7840_port;
1384
1385         if (mos7840_port_paranoia_check(port, __func__)) {
1386                 dbg("%s", "Port Paranoia failed");
1387                 return;
1388         }
1389
1390         serial = mos7840_get_usb_serial(port, __func__);
1391         if (!serial) {
1392                 dbg("%s", "Serial Paranoia failed");
1393                 return;
1394         }
1395
1396         mos7840_port = mos7840_get_port_private(port);
1397
1398         if (mos7840_port == NULL)
1399                 return;
1400
1401         if (serial->dev)
1402                 /* flush and block until tx is empty */
1403                 mos7840_block_until_chase_response(tty, mos7840_port);
1404
1405         if (break_state == -1)
1406                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1407         else
1408                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1409
1410         /* FIXME: no locking on shadowLCR anywhere in driver */
1411         mos7840_port->shadowLCR = data;
1412         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1413             mos7840_port->shadowLCR);
1414         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1415                              mos7840_port->shadowLCR);
1416 }
1417
1418 /*****************************************************************************
1419  * mos7840_write_room
1420  *      this function is called by the tty driver when it wants to know how many
1421  *      bytes of data we can accept for a specific port.
1422  *      If successful, we return the amount of room that we have for this port
1423  *      Otherwise we return a negative error number.
1424  *****************************************************************************/
1425
1426 static int mos7840_write_room(struct tty_struct *tty)
1427 {
1428         struct usb_serial_port *port = tty->driver_data;
1429         int i;
1430         int room = 0;
1431         unsigned long flags;
1432         struct moschip_port *mos7840_port;
1433
1434         if (mos7840_port_paranoia_check(port, __func__)) {
1435                 dbg("%s", "Invalid port");
1436                 dbg("%s", " mos7840_write_room:leaving ...........");
1437                 return -1;
1438         }
1439
1440         mos7840_port = mos7840_get_port_private(port);
1441         if (mos7840_port == NULL) {
1442                 dbg("%s", "mos7840_break:leaving ...........");
1443                 return -1;
1444         }
1445
1446         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1447         for (i = 0; i < NUM_URBS; ++i) {
1448                 if (!mos7840_port->busy[i])
1449                         room += URB_TRANSFER_BUFFER_SIZE;
1450         }
1451         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1452
1453         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1454         dbg("%s - returns %d", __func__, room);
1455         return room;
1456
1457 }
1458
1459 /*****************************************************************************
1460  * mos7840_write
1461  *      this function is called by the tty driver when data should be written to
1462  *      the port.
1463  *      If successful, we return the number of bytes written, otherwise we
1464  *      return a negative error number.
1465  *****************************************************************************/
1466
1467 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1468                          const unsigned char *data, int count)
1469 {
1470         int status;
1471         int i;
1472         int bytes_sent = 0;
1473         int transfer_size;
1474         unsigned long flags;
1475
1476         struct moschip_port *mos7840_port;
1477         struct usb_serial *serial;
1478         struct urb *urb;
1479         /* __u16 Data; */
1480         const unsigned char *current_position = data;
1481         unsigned char *data1;
1482
1483 #ifdef NOTMOS7840
1484         Data = 0x00;
1485         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1486         mos7840_port->shadowLCR = Data;
1487         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1488         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1489             mos7840_port->shadowLCR);
1490
1491         /* Data = 0x03; */
1492         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1493         /* mos7840_port->shadowLCR=Data;//Need to add later */
1494
1495         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1496         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1497
1498         /* Data = 0x0c; */
1499         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1500         Data = 0x00;
1501         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1502         dbg("mos7840_write:DLL value is %x", Data);
1503
1504         Data = 0x0;
1505         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1506         dbg("mos7840_write:DLM value is %x", Data);
1507
1508         Data = Data & ~SERIAL_LCR_DLAB;
1509         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1510             mos7840_port->shadowLCR);
1511         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1512 #endif
1513
1514         if (mos7840_port_paranoia_check(port, __func__)) {
1515                 dbg("%s", "Port Paranoia failed");
1516                 return -1;
1517         }
1518
1519         serial = port->serial;
1520         if (mos7840_serial_paranoia_check(serial, __func__)) {
1521                 dbg("%s", "Serial Paranoia failed");
1522                 return -1;
1523         }
1524
1525         mos7840_port = mos7840_get_port_private(port);
1526         if (mos7840_port == NULL) {
1527                 dbg("%s", "mos7840_port is NULL");
1528                 return -1;
1529         }
1530
1531         /* try to find a free urb in the list */
1532         urb = NULL;
1533
1534         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1535         for (i = 0; i < NUM_URBS; ++i) {
1536                 if (!mos7840_port->busy[i]) {
1537                         mos7840_port->busy[i] = 1;
1538                         urb = mos7840_port->write_urb_pool[i];
1539                         dbg("URB:%d", i);
1540                         break;
1541                 }
1542         }
1543         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1544
1545         if (urb == NULL) {
1546                 dbg("%s - no more free urbs", __func__);
1547                 goto exit;
1548         }
1549
1550         if (urb->transfer_buffer == NULL) {
1551                 urb->transfer_buffer =
1552                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1553
1554                 if (urb->transfer_buffer == NULL) {
1555                         dev_err_console(port, "%s no more kernel memory...\n",
1556                                 __func__);
1557                         goto exit;
1558                 }
1559         }
1560         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1561
1562         memcpy(urb->transfer_buffer, current_position, transfer_size);
1563
1564         /* fill urb with data and submit  */
1565         if ((serial->num_ports == 2)
1566                 && ((((__u16)port->number -
1567                         (__u16)(port->serial->minor)) % 2) != 0)) {
1568                 usb_fill_bulk_urb(urb,
1569                         serial->dev,
1570                         usb_sndbulkpipe(serial->dev,
1571                                 (port->bulk_out_endpointAddress) + 2),
1572                         urb->transfer_buffer,
1573                         transfer_size,
1574                         mos7840_bulk_out_data_callback, mos7840_port);
1575         } else {
1576                 usb_fill_bulk_urb(urb,
1577                         serial->dev,
1578                         usb_sndbulkpipe(serial->dev,
1579                                 port->bulk_out_endpointAddress),
1580                         urb->transfer_buffer,
1581                         transfer_size,
1582                         mos7840_bulk_out_data_callback, mos7840_port);
1583         }
1584
1585         data1 = urb->transfer_buffer;
1586         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1587
1588         /* Turn on LED */
1589         if (mos7840_port->has_led && !mos7840_port->led_flag) {
1590                 mos7840_port->led_flag = true;
1591                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1592                 mod_timer(&mos7840_port->led_timer1,
1593                                 jiffies + msecs_to_jiffies(LED_ON_MS));
1594         }
1595
1596         /* send it down the pipe */
1597         status = usb_submit_urb(urb, GFP_ATOMIC);
1598
1599         if (status) {
1600                 mos7840_port->busy[i] = 0;
1601                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1602                         "with status = %d\n", __func__, status);
1603                 bytes_sent = status;
1604                 goto exit;
1605         }
1606         bytes_sent = transfer_size;
1607         mos7840_port->icount.tx += transfer_size;
1608         smp_wmb();
1609         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1610 exit:
1611         return bytes_sent;
1612
1613 }
1614
1615 /*****************************************************************************
1616  * mos7840_throttle
1617  *      this function is called by the tty driver when it wants to stop the data
1618  *      being read from the port.
1619  *****************************************************************************/
1620
1621 static void mos7840_throttle(struct tty_struct *tty)
1622 {
1623         struct usb_serial_port *port = tty->driver_data;
1624         struct moschip_port *mos7840_port;
1625         int status;
1626
1627         if (mos7840_port_paranoia_check(port, __func__)) {
1628                 dbg("%s", "Invalid port");
1629                 return;
1630         }
1631
1632         dbg("- port %d", port->number);
1633
1634         mos7840_port = mos7840_get_port_private(port);
1635
1636         if (mos7840_port == NULL)
1637                 return;
1638
1639         if (!mos7840_port->open) {
1640                 dbg("%s", "port not opened");
1641                 return;
1642         }
1643
1644         /* if we are implementing XON/XOFF, send the stop character */
1645         if (I_IXOFF(tty)) {
1646                 unsigned char stop_char = STOP_CHAR(tty);
1647                 status = mos7840_write(tty, port, &stop_char, 1);
1648                 if (status <= 0)
1649                         return;
1650         }
1651         /* if we are implementing RTS/CTS, toggle that line */
1652         if (tty->termios->c_cflag & CRTSCTS) {
1653                 mos7840_port->shadowMCR &= ~MCR_RTS;
1654                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1655                                          mos7840_port->shadowMCR);
1656                 if (status < 0)
1657                         return;
1658         }
1659 }
1660
1661 /*****************************************************************************
1662  * mos7840_unthrottle
1663  *      this function is called by the tty driver when it wants to resume
1664  *      the data being read from the port (called after mos7840_throttle is
1665  *      called)
1666  *****************************************************************************/
1667 static void mos7840_unthrottle(struct tty_struct *tty)
1668 {
1669         struct usb_serial_port *port = tty->driver_data;
1670         int status;
1671         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1672
1673         if (mos7840_port_paranoia_check(port, __func__)) {
1674                 dbg("%s", "Invalid port");
1675                 return;
1676         }
1677
1678         if (mos7840_port == NULL)
1679                 return;
1680
1681         if (!mos7840_port->open) {
1682                 dbg("%s - port not opened", __func__);
1683                 return;
1684         }
1685
1686         /* if we are implementing XON/XOFF, send the start character */
1687         if (I_IXOFF(tty)) {
1688                 unsigned char start_char = START_CHAR(tty);
1689                 status = mos7840_write(tty, port, &start_char, 1);
1690                 if (status <= 0)
1691                         return;
1692         }
1693
1694         /* if we are implementing RTS/CTS, toggle that line */
1695         if (tty->termios->c_cflag & CRTSCTS) {
1696                 mos7840_port->shadowMCR |= MCR_RTS;
1697                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1698                                          mos7840_port->shadowMCR);
1699                 if (status < 0)
1700                         return;
1701         }
1702 }
1703
1704 static int mos7840_tiocmget(struct tty_struct *tty)
1705 {
1706         struct usb_serial_port *port = tty->driver_data;
1707         struct moschip_port *mos7840_port;
1708         unsigned int result;
1709         __u16 msr;
1710         __u16 mcr;
1711         int status;
1712         mos7840_port = mos7840_get_port_private(port);
1713
1714         if (mos7840_port == NULL)
1715                 return -ENODEV;
1716
1717         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1718         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1719         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1720             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1721             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1722             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1723             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1724             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1725             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1726
1727         dbg("%s - 0x%04X", __func__, result);
1728
1729         return result;
1730 }
1731
1732 static int mos7840_tiocmset(struct tty_struct *tty,
1733                             unsigned int set, unsigned int clear)
1734 {
1735         struct usb_serial_port *port = tty->driver_data;
1736         struct moschip_port *mos7840_port;
1737         unsigned int mcr;
1738         int status;
1739
1740         mos7840_port = mos7840_get_port_private(port);
1741
1742         if (mos7840_port == NULL)
1743                 return -ENODEV;
1744
1745         /* FIXME: What locks the port registers ? */
1746         mcr = mos7840_port->shadowMCR;
1747         if (clear & TIOCM_RTS)
1748                 mcr &= ~MCR_RTS;
1749         if (clear & TIOCM_DTR)
1750                 mcr &= ~MCR_DTR;
1751         if (clear & TIOCM_LOOP)
1752                 mcr &= ~MCR_LOOPBACK;
1753
1754         if (set & TIOCM_RTS)
1755                 mcr |= MCR_RTS;
1756         if (set & TIOCM_DTR)
1757                 mcr |= MCR_DTR;
1758         if (set & TIOCM_LOOP)
1759                 mcr |= MCR_LOOPBACK;
1760
1761         mos7840_port->shadowMCR = mcr;
1762
1763         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1764         if (status < 0) {
1765                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1766                 return status;
1767         }
1768
1769         return 0;
1770 }
1771
1772 /*****************************************************************************
1773  * mos7840_calc_baud_rate_divisor
1774  *      this function calculates the proper baud rate divisor for the specified
1775  *      baud rate.
1776  *****************************************************************************/
1777 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1778                                           __u16 *clk_sel_val)
1779 {
1780         dbg("%s - %d", __func__, baudRate);
1781
1782         if (baudRate <= 115200) {
1783                 *divisor = 115200 / baudRate;
1784                 *clk_sel_val = 0x0;
1785         }
1786         if ((baudRate > 115200) && (baudRate <= 230400)) {
1787                 *divisor = 230400 / baudRate;
1788                 *clk_sel_val = 0x10;
1789         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1790                 *divisor = 403200 / baudRate;
1791                 *clk_sel_val = 0x20;
1792         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1793                 *divisor = 460800 / baudRate;
1794                 *clk_sel_val = 0x30;
1795         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1796                 *divisor = 806400 / baudRate;
1797                 *clk_sel_val = 0x40;
1798         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1799                 *divisor = 921600 / baudRate;
1800                 *clk_sel_val = 0x50;
1801         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1802                 *divisor = 1572864 / baudRate;
1803                 *clk_sel_val = 0x60;
1804         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1805                 *divisor = 3145728 / baudRate;
1806                 *clk_sel_val = 0x70;
1807         }
1808         return 0;
1809
1810 #ifdef NOTMCS7840
1811
1812         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1813                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1814                         *divisor = mos7840_divisor_table[i].Divisor;
1815                         return 0;
1816                 }
1817         }
1818
1819         /* After trying for all the standard baud rates    *
1820          * Try calculating the divisor for this baud rate  */
1821
1822         if (baudrate > 75 && baudrate < 230400) {
1823                 /* get the divisor */
1824                 custom = (__u16) (230400L / baudrate);
1825
1826                 /* Check for round off */
1827                 round1 = (__u16) (2304000L / baudrate);
1828                 round = (__u16) (round1 - (custom * 10));
1829                 if (round > 4)
1830                         custom++;
1831                 *divisor = custom;
1832
1833                 dbg(" Baud %d = %d", baudrate, custom);
1834                 return 0;
1835         }
1836
1837         dbg("%s", " Baud calculation Failed...");
1838         return -1;
1839 #endif
1840 }
1841
1842 /*****************************************************************************
1843  * mos7840_send_cmd_write_baud_rate
1844  *      this function sends the proper command to change the baud rate of the
1845  *      specified port.
1846  *****************************************************************************/
1847
1848 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1849                                             int baudRate)
1850 {
1851         int divisor = 0;
1852         int status;
1853         __u16 Data;
1854         unsigned char number;
1855         __u16 clk_sel_val;
1856         struct usb_serial_port *port;
1857
1858         if (mos7840_port == NULL)
1859                 return -1;
1860
1861         port = (struct usb_serial_port *)mos7840_port->port;
1862         if (mos7840_port_paranoia_check(port, __func__)) {
1863                 dbg("%s", "Invalid port");
1864                 return -1;
1865         }
1866
1867         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1868                 dbg("%s", "Invalid Serial");
1869                 return -1;
1870         }
1871
1872         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1873
1874         dbg("%s - port = %d, baud = %d", __func__,
1875             mos7840_port->port->number, baudRate);
1876         /* reset clk_uart_sel in spregOffset */
1877         if (baudRate > 115200) {
1878 #ifdef HW_flow_control
1879                 /* NOTE: need to see the pther register to modify */
1880                 /* setting h/w flow control bit to 1 */
1881                 Data = 0x2b;
1882                 mos7840_port->shadowMCR = Data;
1883                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1884                                                                         Data);
1885                 if (status < 0) {
1886                         dbg("Writing spreg failed in set_serial_baud");
1887                         return -1;
1888                 }
1889 #endif
1890
1891         } else {
1892 #ifdef HW_flow_control
1893                 /* setting h/w flow control bit to 0 */
1894                 Data = 0xb;
1895                 mos7840_port->shadowMCR = Data;
1896                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1897                                                                         Data);
1898                 if (status < 0) {
1899                         dbg("Writing spreg failed in set_serial_baud");
1900                         return -1;
1901                 }
1902 #endif
1903
1904         }
1905
1906         if (1) {                /* baudRate <= 115200) */
1907                 clk_sel_val = 0x0;
1908                 Data = 0x0;
1909                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1910                                                    &clk_sel_val);
1911                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1912                                                                  &Data);
1913                 if (status < 0) {
1914                         dbg("reading spreg failed in set_serial_baud");
1915                         return -1;
1916                 }
1917                 Data = (Data & 0x8f) | clk_sel_val;
1918                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1919                                                                 Data);
1920                 if (status < 0) {
1921                         dbg("Writing spreg failed in set_serial_baud");
1922                         return -1;
1923                 }
1924                 /* Calculate the Divisor */
1925
1926                 if (status) {
1927                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1928                         return status;
1929                 }
1930                 /* Enable access to divisor latch */
1931                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1932                 mos7840_port->shadowLCR = Data;
1933                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1934
1935                 /* Write the divisor */
1936                 Data = (unsigned char)(divisor & 0xff);
1937                 dbg("set_serial_baud Value to write DLL is %x", Data);
1938                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1939
1940                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1941                 dbg("set_serial_baud Value to write DLM is %x", Data);
1942                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1943
1944                 /* Disable access to divisor latch */
1945                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1946                 mos7840_port->shadowLCR = Data;
1947                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1948
1949         }
1950         return status;
1951 }
1952
1953 /*****************************************************************************
1954  * mos7840_change_port_settings
1955  *      This routine is called to set the UART on the device to match
1956  *      the specified new settings.
1957  *****************************************************************************/
1958
1959 static void mos7840_change_port_settings(struct tty_struct *tty,
1960         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1961 {
1962         int baud;
1963         unsigned cflag;
1964         unsigned iflag;
1965         __u8 lData;
1966         __u8 lParity;
1967         __u8 lStop;
1968         int status;
1969         __u16 Data;
1970         struct usb_serial_port *port;
1971         struct usb_serial *serial;
1972
1973         if (mos7840_port == NULL)
1974                 return;
1975
1976         port = (struct usb_serial_port *)mos7840_port->port;
1977
1978         if (mos7840_port_paranoia_check(port, __func__)) {
1979                 dbg("%s", "Invalid port");
1980                 return;
1981         }
1982
1983         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1984                 dbg("%s", "Invalid Serial");
1985                 return;
1986         }
1987
1988         serial = port->serial;
1989
1990         dbg("%s - port %d", __func__, mos7840_port->port->number);
1991
1992         if (!mos7840_port->open) {
1993                 dbg("%s - port not opened", __func__);
1994                 return;
1995         }
1996
1997         lData = LCR_BITS_8;
1998         lStop = LCR_STOP_1;
1999         lParity = LCR_PAR_NONE;
2000
2001         cflag = tty->termios->c_cflag;
2002         iflag = tty->termios->c_iflag;
2003
2004         /* Change the number of bits */
2005         if (cflag & CSIZE) {
2006                 switch (cflag & CSIZE) {
2007                 case CS5:
2008                         lData = LCR_BITS_5;
2009                         break;
2010
2011                 case CS6:
2012                         lData = LCR_BITS_6;
2013                         break;
2014
2015                 case CS7:
2016                         lData = LCR_BITS_7;
2017                         break;
2018                 default:
2019                 case CS8:
2020                         lData = LCR_BITS_8;
2021                         break;
2022                 }
2023         }
2024         /* Change the Parity bit */
2025         if (cflag & PARENB) {
2026                 if (cflag & PARODD) {
2027                         lParity = LCR_PAR_ODD;
2028                         dbg("%s - parity = odd", __func__);
2029                 } else {
2030                         lParity = LCR_PAR_EVEN;
2031                         dbg("%s - parity = even", __func__);
2032                 }
2033
2034         } else {
2035                 dbg("%s - parity = none", __func__);
2036         }
2037
2038         if (cflag & CMSPAR)
2039                 lParity = lParity | 0x20;
2040
2041         /* Change the Stop bit */
2042         if (cflag & CSTOPB) {
2043                 lStop = LCR_STOP_2;
2044                 dbg("%s - stop bits = 2", __func__);
2045         } else {
2046                 lStop = LCR_STOP_1;
2047                 dbg("%s - stop bits = 1", __func__);
2048         }
2049
2050         /* Update the LCR with the correct value */
2051         mos7840_port->shadowLCR &=
2052             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2053         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2054
2055         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2056             mos7840_port->shadowLCR);
2057         /* Disable Interrupts */
2058         Data = 0x00;
2059         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2060
2061         Data = 0x00;
2062         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2063
2064         Data = 0xcf;
2065         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2066
2067         /* Send the updated LCR value to the mos7840 */
2068         Data = mos7840_port->shadowLCR;
2069
2070         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2071
2072         Data = 0x00b;
2073         mos7840_port->shadowMCR = Data;
2074         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2075         Data = 0x00b;
2076         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2077
2078         /* set up the MCR register and send it to the mos7840 */
2079
2080         mos7840_port->shadowMCR = MCR_MASTER_IE;
2081         if (cflag & CBAUD)
2082                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2083
2084         if (cflag & CRTSCTS)
2085                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2086         else
2087                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2088
2089         Data = mos7840_port->shadowMCR;
2090         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2091
2092         /* Determine divisor based on baud rate */
2093         baud = tty_get_baud_rate(tty);
2094
2095         if (!baud) {
2096                 /* pick a default, any default... */
2097                 dbg("%s", "Picked default baud...");
2098                 baud = 9600;
2099         }
2100
2101         dbg("%s - baud rate = %d", __func__, baud);
2102         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2103
2104         /* Enable Interrupts */
2105         Data = 0x0c;
2106         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2107
2108         if (mos7840_port->read_urb_busy == false) {
2109                 mos7840_port->read_urb_busy = true;
2110                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2111                 if (status) {
2112                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2113                             status);
2114                         mos7840_port->read_urb_busy = false;
2115                 }
2116         }
2117         wake_up(&mos7840_port->delta_msr_wait);
2118         mos7840_port->delta_msr_cond = 1;
2119         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2120             mos7840_port->shadowLCR);
2121 }
2122
2123 /*****************************************************************************
2124  * mos7840_set_termios
2125  *      this function is called by the tty driver when it wants to change
2126  *      the termios structure
2127  *****************************************************************************/
2128
2129 static void mos7840_set_termios(struct tty_struct *tty,
2130                                 struct usb_serial_port *port,
2131                                 struct ktermios *old_termios)
2132 {
2133         int status;
2134         unsigned int cflag;
2135         struct usb_serial *serial;
2136         struct moschip_port *mos7840_port;
2137
2138         if (mos7840_port_paranoia_check(port, __func__)) {
2139                 dbg("%s", "Invalid port");
2140                 return;
2141         }
2142
2143         serial = port->serial;
2144
2145         if (mos7840_serial_paranoia_check(serial, __func__)) {
2146                 dbg("%s", "Invalid Serial");
2147                 return;
2148         }
2149
2150         mos7840_port = mos7840_get_port_private(port);
2151
2152         if (mos7840_port == NULL)
2153                 return;
2154
2155         if (!mos7840_port->open) {
2156                 dbg("%s - port not opened", __func__);
2157                 return;
2158         }
2159
2160         dbg("%s", "setting termios - ");
2161
2162         cflag = tty->termios->c_cflag;
2163
2164         dbg("%s - clfag %08x iflag %08x", __func__,
2165             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2166         dbg("%s - old clfag %08x old iflag %08x", __func__,
2167             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2168         dbg("%s - port %d", __func__, port->number);
2169
2170         /* change the port settings to the new ones specified */
2171
2172         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2173
2174         if (!mos7840_port->read_urb) {
2175                 dbg("%s", "URB KILLED !!!!!");
2176                 return;
2177         }
2178
2179         if (mos7840_port->read_urb_busy == false) {
2180                 mos7840_port->read_urb_busy = true;
2181                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2182                 if (status) {
2183                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2184                             status);
2185                         mos7840_port->read_urb_busy = false;
2186                 }
2187         }
2188 }
2189
2190 /*****************************************************************************
2191  * mos7840_get_lsr_info - get line status register info
2192  *
2193  * Purpose: Let user call ioctl() to get info when the UART physically
2194  *          is emptied.  On bus types like RS485, the transmitter must
2195  *          release the bus after transmitting. This must be done when
2196  *          the transmit shift register is empty, not be done when the
2197  *          transmit holding register is empty.  This functionality
2198  *          allows an RS485 driver to be written in user space.
2199  *****************************************************************************/
2200
2201 static int mos7840_get_lsr_info(struct tty_struct *tty,
2202                                 unsigned int __user *value)
2203 {
2204         int count;
2205         unsigned int result = 0;
2206
2207         count = mos7840_chars_in_buffer(tty);
2208         if (count == 0) {
2209                 dbg("%s -- Empty", __func__);
2210                 result = TIOCSER_TEMT;
2211         }
2212
2213         if (copy_to_user(value, &result, sizeof(int)))
2214                 return -EFAULT;
2215         return 0;
2216 }
2217
2218 /*****************************************************************************
2219  * mos7840_get_serial_info
2220  *      function to get information about serial port
2221  *****************************************************************************/
2222
2223 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2224                                    struct serial_struct __user *retinfo)
2225 {
2226         struct serial_struct tmp;
2227
2228         if (mos7840_port == NULL)
2229                 return -1;
2230
2231         if (!retinfo)
2232                 return -EFAULT;
2233
2234         memset(&tmp, 0, sizeof(tmp));
2235
2236         tmp.type = PORT_16550A;
2237         tmp.line = mos7840_port->port->serial->minor;
2238         tmp.port = mos7840_port->port->number;
2239         tmp.irq = 0;
2240         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2241         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2242         tmp.baud_base = 9600;
2243         tmp.close_delay = 5 * HZ;
2244         tmp.closing_wait = 30 * HZ;
2245
2246         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2247                 return -EFAULT;
2248         return 0;
2249 }
2250
2251 static int mos7840_get_icount(struct tty_struct *tty,
2252                         struct serial_icounter_struct *icount)
2253 {
2254         struct usb_serial_port *port = tty->driver_data;
2255         struct moschip_port *mos7840_port;
2256         struct async_icount cnow;
2257
2258         mos7840_port = mos7840_get_port_private(port);
2259         cnow = mos7840_port->icount;
2260
2261         smp_rmb();
2262         icount->cts = cnow.cts;
2263         icount->dsr = cnow.dsr;
2264         icount->rng = cnow.rng;
2265         icount->dcd = cnow.dcd;
2266         icount->rx = cnow.rx;
2267         icount->tx = cnow.tx;
2268         icount->frame = cnow.frame;
2269         icount->overrun = cnow.overrun;
2270         icount->parity = cnow.parity;
2271         icount->brk = cnow.brk;
2272         icount->buf_overrun = cnow.buf_overrun;
2273
2274         dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2275                 port->number, icount->rx, icount->tx);
2276         return 0;
2277 }
2278
2279 /*****************************************************************************
2280  * SerialIoctl
2281  *      this function handles any ioctl calls to the driver
2282  *****************************************************************************/
2283
2284 static int mos7840_ioctl(struct tty_struct *tty,
2285                          unsigned int cmd, unsigned long arg)
2286 {
2287         struct usb_serial_port *port = tty->driver_data;
2288         void __user *argp = (void __user *)arg;
2289         struct moschip_port *mos7840_port;
2290
2291         struct async_icount cnow;
2292         struct async_icount cprev;
2293
2294         if (mos7840_port_paranoia_check(port, __func__)) {
2295                 dbg("%s", "Invalid port");
2296                 return -1;
2297         }
2298
2299         mos7840_port = mos7840_get_port_private(port);
2300
2301         if (mos7840_port == NULL)
2302                 return -1;
2303
2304         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2305
2306         switch (cmd) {
2307                 /* return number of bytes available */
2308
2309         case TIOCSERGETLSR:
2310                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2311                 return mos7840_get_lsr_info(tty, argp);
2312
2313         case TIOCGSERIAL:
2314                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2315                 return mos7840_get_serial_info(mos7840_port, argp);
2316
2317         case TIOCSSERIAL:
2318                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2319                 break;
2320
2321         case TIOCMIWAIT:
2322                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2323                 cprev = mos7840_port->icount;
2324                 while (1) {
2325                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2326                         mos7840_port->delta_msr_cond = 0;
2327                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2328                                                  (mos7840_port->
2329                                                   delta_msr_cond == 1));
2330
2331                         /* see if a signal did it */
2332                         if (signal_pending(current))
2333                                 return -ERESTARTSYS;
2334                         cnow = mos7840_port->icount;
2335                         smp_rmb();
2336                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2337                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2338                                 return -EIO;    /* no change => error */
2339                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2340                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2341                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2342                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2343                                 return 0;
2344                         }
2345                         cprev = cnow;
2346                 }
2347                 /* NOTREACHED */
2348                 break;
2349
2350         default:
2351                 break;
2352         }
2353         return -ENOIOCTLCMD;
2354 }
2355
2356 static int mos7810_check(struct usb_serial *serial)
2357 {
2358         int i, pass_count = 0;
2359         __u16 data = 0, mcr_data = 0;
2360         __u16 test_pattern = 0x55AA;
2361
2362         /* Store MCR setting */
2363         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2364                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2365                 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2366
2367         for (i = 0; i < 16; i++) {
2368                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2369                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2370                         MCS_WRREQ, MCS_WR_RTYPE,
2371                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2372                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2373
2374                 /* Read the test pattern back */
2375                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2376                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2377                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2378
2379                 /* If this is a MCS7810 device, both test patterns must match */
2380                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2381                         break;
2382
2383                 pass_count++;
2384         }
2385
2386         /* Restore MCR setting */
2387         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2388                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2389                 0, MOS_WDR_TIMEOUT);
2390
2391         if (pass_count == 16)
2392                 return 1;
2393
2394         return 0;
2395 }
2396
2397 static int mos7840_calc_num_ports(struct usb_serial *serial)
2398 {
2399         __u16 data = 0x00;
2400         int mos7840_num_ports;
2401
2402         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2403                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2404                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2405
2406         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2407                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2408                 device_type = serial->dev->descriptor.idProduct;
2409         } else {
2410                 /* For a MCS7840 device GPIO0 must be set to 1 */
2411                 if ((data & 0x01) == 1)
2412                         device_type = MOSCHIP_DEVICE_ID_7840;
2413                 else if (mos7810_check(serial))
2414                         device_type = MOSCHIP_DEVICE_ID_7810;
2415                 else
2416                         device_type = MOSCHIP_DEVICE_ID_7820;
2417         }
2418
2419         mos7840_num_ports = (device_type >> 4) & 0x000F;
2420         serial->num_bulk_in = mos7840_num_ports;
2421         serial->num_bulk_out = mos7840_num_ports;
2422         serial->num_ports = mos7840_num_ports;
2423
2424         return mos7840_num_ports;
2425 }
2426
2427 /****************************************************************************
2428  * mos7840_startup
2429  ****************************************************************************/
2430
2431 static int mos7840_startup(struct usb_serial *serial)
2432 {
2433         struct moschip_port *mos7840_port;
2434         struct usb_device *dev;
2435         int i, status;
2436         __u16 Data;
2437
2438         if (!serial) {
2439                 dbg("%s", "Invalid Handler");
2440                 return -1;
2441         }
2442
2443         dev = serial->dev;
2444
2445         /* we set up the pointers to the endpoints in the mos7840_open *
2446          * function, as the structures aren't created yet.             */
2447
2448         /* set up port private structures */
2449         for (i = 0; i < serial->num_ports; ++i) {
2450                 dbg ("mos7840_startup: configuring port %d............", i);
2451                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2452                 if (mos7840_port == NULL) {
2453                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2454                         status = -ENOMEM;
2455                         i--; /* don't follow NULL pointer cleaning up */
2456                         goto error;
2457                 }
2458
2459                 /* Initialize all port interrupt end point to port 0 int
2460                  * endpoint. Our device has only one interrupt end point
2461                  * common to all port */
2462
2463                 mos7840_port->port = serial->port[i];
2464                 mos7840_set_port_private(serial->port[i], mos7840_port);
2465                 spin_lock_init(&mos7840_port->pool_lock);
2466
2467                 /* minor is not initialised until later by
2468                  * usb-serial.c:get_free_serial() and cannot therefore be used
2469                  * to index device instances */
2470                 mos7840_port->port_num = i + 1;
2471                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2472                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2473                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2474                 dbg ("serial->minor = %d", serial->minor);
2475
2476                 if (mos7840_port->port_num == 1) {
2477                         mos7840_port->SpRegOffset = 0x0;
2478                         mos7840_port->ControlRegOffset = 0x1;
2479                         mos7840_port->DcrRegOffset = 0x4;
2480                 } else if ((mos7840_port->port_num == 2)
2481                            && (serial->num_ports == 4)) {
2482                         mos7840_port->SpRegOffset = 0x8;
2483                         mos7840_port->ControlRegOffset = 0x9;
2484                         mos7840_port->DcrRegOffset = 0x16;
2485                 } else if ((mos7840_port->port_num == 2)
2486                            && (serial->num_ports == 2)) {
2487                         mos7840_port->SpRegOffset = 0xa;
2488                         mos7840_port->ControlRegOffset = 0xb;
2489                         mos7840_port->DcrRegOffset = 0x19;
2490                 } else if ((mos7840_port->port_num == 3)
2491                            && (serial->num_ports == 4)) {
2492                         mos7840_port->SpRegOffset = 0xa;
2493                         mos7840_port->ControlRegOffset = 0xb;
2494                         mos7840_port->DcrRegOffset = 0x19;
2495                 } else if ((mos7840_port->port_num == 4)
2496                            && (serial->num_ports == 4)) {
2497                         mos7840_port->SpRegOffset = 0xc;
2498                         mos7840_port->ControlRegOffset = 0xd;
2499                         mos7840_port->DcrRegOffset = 0x1c;
2500                 }
2501                 mos7840_dump_serial_port(mos7840_port);
2502                 mos7840_set_port_private(serial->port[i], mos7840_port);
2503
2504                 /* enable rx_disable bit in control register */
2505                 status = mos7840_get_reg_sync(serial->port[i],
2506                                  mos7840_port->ControlRegOffset, &Data);
2507                 if (status < 0) {
2508                         dbg("Reading ControlReg failed status-0x%x", status);
2509                         break;
2510                 } else
2511                         dbg("ControlReg Reading success val is %x, status%d",
2512                             Data, status);
2513                 Data |= 0x08;   /* setting driver done bit */
2514                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2515                                    modem status reg */
2516
2517                 /* Data |= 0x20; //rx_disable bit */
2518                 status = mos7840_set_reg_sync(serial->port[i],
2519                                          mos7840_port->ControlRegOffset, Data);
2520                 if (status < 0) {
2521                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2522                         break;
2523                 } else
2524                         dbg("ControlReg Writing success(rx_disable) status%d",
2525                             status);
2526
2527                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2528                    and 0x24 in DCR3 */
2529                 Data = 0x01;
2530                 status = mos7840_set_reg_sync(serial->port[i],
2531                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2532                 if (status < 0) {
2533                         dbg("Writing DCR0 failed status-0x%x", status);
2534                         break;
2535                 } else
2536                         dbg("DCR0 Writing success status%d", status);
2537
2538                 Data = 0x05;
2539                 status = mos7840_set_reg_sync(serial->port[i],
2540                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2541                 if (status < 0) {
2542                         dbg("Writing DCR1 failed status-0x%x", status);
2543                         break;
2544                 } else
2545                         dbg("DCR1 Writing success status%d", status);
2546
2547                 Data = 0x24;
2548                 status = mos7840_set_reg_sync(serial->port[i],
2549                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2550                 if (status < 0) {
2551                         dbg("Writing DCR2 failed status-0x%x", status);
2552                         break;
2553                 } else
2554                         dbg("DCR2 Writing success status%d", status);
2555
2556                 /* write values in clkstart0x0 and clkmulti 0x20 */
2557                 Data = 0x0;
2558                 status = mos7840_set_reg_sync(serial->port[i],
2559                                          CLK_START_VALUE_REGISTER, Data);
2560                 if (status < 0) {
2561                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2562                         break;
2563                 } else
2564                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2565
2566                 Data = 0x20;
2567                 status = mos7840_set_reg_sync(serial->port[i],
2568                                         CLK_MULTI_REGISTER, Data);
2569                 if (status < 0) {
2570                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2571                             status);
2572                         goto error;
2573                 } else
2574                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2575                             status);
2576
2577                 /* write value 0x0 to scratchpad register */
2578                 Data = 0x00;
2579                 status = mos7840_set_uart_reg(serial->port[i],
2580                                                 SCRATCH_PAD_REGISTER, Data);
2581                 if (status < 0) {
2582                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2583                             status);
2584                         break;
2585                 } else
2586                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2587                             status);
2588
2589                 /* Zero Length flag register */
2590                 if ((mos7840_port->port_num != 1)
2591                     && (serial->num_ports == 2)) {
2592
2593                         Data = 0xff;
2594                         status = mos7840_set_reg_sync(serial->port[i],
2595                                       (__u16) (ZLP_REG1 +
2596                                       ((__u16)mos7840_port->port_num)), Data);
2597                         dbg("ZLIP offset %x",
2598                             (__u16) (ZLP_REG1 +
2599                                         ((__u16) mos7840_port->port_num)));
2600                         if (status < 0) {
2601                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2602                                     i + 2, status);
2603                                 break;
2604                         } else
2605                                 dbg("ZLP_REG%d Writing success status%d",
2606                                     i + 2, status);
2607                 } else {
2608                         Data = 0xff;
2609                         status = mos7840_set_reg_sync(serial->port[i],
2610                               (__u16) (ZLP_REG1 +
2611                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2612                         dbg("ZLIP offset %x",
2613                             (__u16) (ZLP_REG1 +
2614                                      ((__u16) mos7840_port->port_num) - 0x1));
2615                         if (status < 0) {
2616                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2617                                     i + 1, status);
2618                                 break;
2619                         } else
2620                                 dbg("ZLP_REG%d Writing success status%d",
2621                                     i + 1, status);
2622
2623                 }
2624                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2625                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2626                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2627                                                                 GFP_KERNEL);
2628                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2629                                                         !mos7840_port->dr) {
2630                         status = -ENOMEM;
2631                         goto error;
2632                 }
2633
2634                 mos7840_port->has_led = false;
2635
2636                 /* Initialize LED timers */
2637                 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2638                         mos7840_port->has_led = true;
2639
2640                         init_timer(&mos7840_port->led_timer1);
2641                         mos7840_port->led_timer1.function = mos7840_led_off;
2642                         mos7840_port->led_timer1.expires =
2643                                         jiffies + msecs_to_jiffies(LED_ON_MS);
2644                         mos7840_port->led_timer1.data =
2645                                                 (unsigned long)mos7840_port;
2646
2647                         init_timer(&mos7840_port->led_timer2);
2648                         mos7840_port->led_timer2.function =
2649                                                 mos7840_led_flag_off;
2650                         mos7840_port->led_timer2.expires =
2651                                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2652                         mos7840_port->led_timer2.data =
2653                                                 (unsigned long)mos7840_port;
2654
2655                         mos7840_port->led_flag = false;
2656
2657                         /* Turn off LED */
2658                         mos7840_set_led_sync(serial->port[i],
2659                                                 MODEM_CONTROL_REGISTER, 0x0300);
2660                 }
2661         }
2662         dbg ("mos7840_startup: all ports configured...........");
2663
2664         /* Zero Length flag enable */
2665         Data = 0x0f;
2666         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2667         if (status < 0) {
2668                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2669                 goto error;
2670         } else
2671                 dbg("ZLP_REG5 Writing success status%d", status);
2672
2673         /* setting configuration feature to one */
2674         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2675                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2676         return 0;
2677 error:
2678         for (/* nothing */; i >= 0; i--) {
2679                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2680
2681                 kfree(mos7840_port->dr);
2682                 kfree(mos7840_port->ctrl_buf);
2683                 usb_free_urb(mos7840_port->control_urb);
2684                 kfree(mos7840_port);
2685                 serial->port[i] = NULL;
2686         }
2687         return status;
2688 }
2689
2690 /****************************************************************************
2691  * mos7840_disconnect
2692  *      This function is called whenever the device is removed from the usb bus.
2693  ****************************************************************************/
2694
2695 static void mos7840_disconnect(struct usb_serial *serial)
2696 {
2697         int i;
2698         unsigned long flags;
2699         struct moschip_port *mos7840_port;
2700
2701         if (!serial) {
2702                 dbg("%s", "Invalid Handler");
2703                 return;
2704         }
2705
2706         /* check for the ports to be closed,close the ports and disconnect */
2707
2708         /* free private structure allocated for serial port  *
2709          * stop reads and writes on all ports                */
2710
2711         for (i = 0; i < serial->num_ports; ++i) {
2712                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2713                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2714                 if (mos7840_port) {
2715                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2716                         mos7840_port->zombie = 1;
2717                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2718                         usb_kill_urb(mos7840_port->control_urb);
2719                 }
2720         }
2721 }
2722
2723 /****************************************************************************
2724  * mos7840_release
2725  *      This function is called when the usb_serial structure is freed.
2726  ****************************************************************************/
2727
2728 static void mos7840_release(struct usb_serial *serial)
2729 {
2730         int i;
2731         struct moschip_port *mos7840_port;
2732
2733         if (!serial) {
2734                 dbg("%s", "Invalid Handler");
2735                 return;
2736         }
2737
2738         /* check for the ports to be closed,close the ports and disconnect */
2739
2740         /* free private structure allocated for serial port  *
2741          * stop reads and writes on all ports                */
2742
2743         for (i = 0; i < serial->num_ports; ++i) {
2744                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2745                 dbg("mos7840_port %d = %p", i, mos7840_port);
2746                 if (mos7840_port) {
2747                         if (mos7840_port->has_led) {
2748                                 /* Turn off LED */
2749                                 mos7840_set_led_sync(mos7840_port->port,
2750                                                 MODEM_CONTROL_REGISTER, 0x0300);
2751
2752                                 del_timer_sync(&mos7840_port->led_timer1);
2753                                 del_timer_sync(&mos7840_port->led_timer2);
2754                         }
2755                         kfree(mos7840_port->ctrl_buf);
2756                         kfree(mos7840_port->dr);
2757                         kfree(mos7840_port);
2758                 }
2759         }
2760 }
2761
2762 static struct usb_serial_driver moschip7840_4port_device = {
2763         .driver = {
2764                    .owner = THIS_MODULE,
2765                    .name = "mos7840",
2766                    },
2767         .description = DRIVER_DESC,
2768         .id_table = id_table,
2769         .num_ports = 4,
2770         .open = mos7840_open,
2771         .close = mos7840_close,
2772         .write = mos7840_write,
2773         .write_room = mos7840_write_room,
2774         .chars_in_buffer = mos7840_chars_in_buffer,
2775         .throttle = mos7840_throttle,
2776         .unthrottle = mos7840_unthrottle,
2777         .calc_num_ports = mos7840_calc_num_ports,
2778 #ifdef MCSSerialProbe
2779         .probe = mos7840_serial_probe,
2780 #endif
2781         .ioctl = mos7840_ioctl,
2782         .set_termios = mos7840_set_termios,
2783         .break_ctl = mos7840_break,
2784         .tiocmget = mos7840_tiocmget,
2785         .tiocmset = mos7840_tiocmset,
2786         .get_icount = mos7840_get_icount,
2787         .attach = mos7840_startup,
2788         .disconnect = mos7840_disconnect,
2789         .release = mos7840_release,
2790         .read_bulk_callback = mos7840_bulk_in_callback,
2791         .read_int_callback = mos7840_interrupt_callback,
2792 };
2793
2794 static struct usb_serial_driver * const serial_drivers[] = {
2795         &moschip7840_4port_device, NULL
2796 };
2797
2798 module_usb_serial_driver(serial_drivers, id_table);
2799
2800 MODULE_DESCRIPTION(DRIVER_DESC);
2801 MODULE_LICENSE("GPL");
2802
2803 module_param(debug, bool, S_IRUGO | S_IWUSR);
2804 MODULE_PARM_DESC(debug, "Debug enabled or not");