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 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  39
  40 /*
  41  * 16C50 UART register defines
  42  */
  43
  44 #define LCR_BITS_5             0x00     /* 5 bits/char */
  45 #define LCR_BITS_6             0x01     /* 6 bits/char */
  46 #define LCR_BITS_7             0x02     /* 7 bits/char */
  47 #define LCR_BITS_8             0x03     /* 8 bits/char */
  48 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  49
  50 #define LCR_STOP_1             0x00     /* 1 stop bit */
  51 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  52 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  53 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  54
  55 #define LCR_PAR_NONE           0x00     /* No parity */
  56 #define LCR_PAR_ODD            0x08     /* Odd parity */
  57 #define LCR_PAR_EVEN           0x18     /* Even parity */
  58 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  59 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  60 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  61
  62 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  63 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  64
  65 #define MCR_DTR                0x01     /* Assert DTR */
  66 #define MCR_RTS                0x02     /* Assert RTS */
  67 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  68 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  69 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  70 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  71
  72 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  73 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  74 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  75 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  76
  77 /*
  78  * Defines used for sending commands to port
  79  */
  80
  81 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  82
  83 #define MOS_PORT1       0x0200
  84 #define MOS_PORT2       0x0300
  85 #define MOS_VENREG      0x0000
  86 #define MOS_MAX_PORT    0x02
  87 #define MOS_WRITE       0x0E
  88 #define MOS_READ        0x0D
  89
  90 /* Requests */
  91 #define MCS_RD_RTYPE    0xC0
  92 #define MCS_WR_RTYPE    0x40
  93 #define MCS_RDREQ       0x0D
  94 #define MCS_WRREQ       0x0E
  95 #define MCS_CTRL_TIMEOUT        500
  96 #define VENDOR_READ_LENGTH      (0x01)
  97
  98 #define MAX_NAME_LEN    64
  99
 100 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 101 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 102
 103 /* For higher baud Rates use TIOCEXBAUD */
 104 #define TIOCEXBAUD     0x5462
 105
 106 /* vendor id and device id defines */
 107
 108 /* The native mos7840/7820 component */
 109 #define USB_VENDOR_ID_MOSCHIP           0x9710
 110 #define MOSCHIP_DEVICE_ID_7840          0x7840
 111 #define MOSCHIP_DEVICE_ID_7820          0x7820
 112 #define MOSCHIP_DEVICE_ID_7810          0x7810
 113 /* The native component can have its vendor/device id's overridden
 114  * in vendor-specific implementations.  Such devices can be handled
 115  * by making a change here, in id_table.
 116  */
 117 #define USB_VENDOR_ID_BANDB              0x0856
 118 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 119 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 120 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 121 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 122 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 123 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 124 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 125 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 126 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 127 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 128 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 129 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 130 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 131
 132 /* This driver also supports
 133  * ATEN UC2324 device using Moschip MCS7840
 134  * ATEN UC2322 device using Moschip MCS7820
 135  */
 136 #define USB_VENDOR_ID_ATENINTL          0x0557
 137 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 138 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 139
 140 /* Interrupt Routine Defines    */
 141
 142 #define SERIAL_IIR_RLS      0x06
 143 #define SERIAL_IIR_MS       0x00
 144
 145 /*
 146  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 147  */
 148 #define SERIAL_LSR_DR       0x0001
 149 #define SERIAL_LSR_OE       0x0002
 150 #define SERIAL_LSR_PE       0x0004
 151 #define SERIAL_LSR_FE       0x0008
 152 #define SERIAL_LSR_BI       0x0010
 153
 154 #define MOS_MSR_DELTA_CTS   0x10
 155 #define MOS_MSR_DELTA_DSR   0x20
 156 #define MOS_MSR_DELTA_RI    0x40
 157 #define MOS_MSR_DELTA_CD    0x80
 158
 159 /* Serial Port register Address */
 160 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 161 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 162 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 163 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 164 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 165 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 166 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 167 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 168 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 169
 170 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 171 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 172 #define GPIO_REGISTER              ((__u16)(0x07))
 173
 174 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 175
 176 /*
 177  * URB POOL related defines
 178  */
 179 #define NUM_URBS                        16      /* URB Count */
 180 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 181
 182 /* LED on/off milliseconds*/
 183 #define LED_ON_MS       500
 184 #define LED_OFF_MS      500
 185
 186 static int device_type;
 187
 188 static const struct usb_device_id id_table[] = {
 189         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 190         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 191         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 192         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 193         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 194         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 195         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 205         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 206         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 207         {}                      /* terminating entry */
 208 };
 209 MODULE_DEVICE_TABLE(usb, id_table);
 210
 211 /* This structure holds all of the local port information */
 212
 213 struct moschip_port {
 214         int port_num;           /*Actual port number in the device(1,2,etc) */
 215         struct urb *write_urb;  /* write URB for this port */
 216         struct urb *read_urb;   /* read URB for this port */
 217         __u8 shadowLCR;         /* last LCR value received */
 218         __u8 shadowMCR;         /* last MCR value received */
 219         char open;
 220         char open_ports;
 221         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 222         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 223         int delta_msr_cond;
 224         struct async_icount icount;
 225         struct usb_serial_port *port;   /* loop back to the owner of this object */
 226
 227         /* Offsets */
 228         __u8 SpRegOffset;
 229         __u8 ControlRegOffset;
 230         __u8 DcrRegOffset;
 231         /* for processing control URBS in interrupt context */
 232         struct urb *control_urb;
 233         struct usb_ctrlrequest *dr;
 234         char *ctrl_buf;
 235         int MsrLsr;
 236
 237         spinlock_t pool_lock;
 238         struct urb *write_urb_pool[NUM_URBS];
 239         char busy[NUM_URBS];
 240         bool read_urb_busy;
 241
 242         /* For device(s) with LED indicator */
 243         bool has_led;
 244         bool led_flag;
 245         struct timer_list led_timer1;   /* Timer for LED on */
 246         struct timer_list led_timer2;   /* Timer for LED off */
 247 };
 248
 249 /*
 250  * mos7840_set_reg_sync
 251  *      To set the Control register by calling usb_fill_control_urb function
 252  *      by passing usb_sndctrlpipe function as parameter.
 253  */
 254
 255 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 256                                 __u16 val)
 257 {
 258         struct usb_device *dev = port->serial->dev;
 259         val = val & 0x00ff;
 260         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 261
 262         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 263                                MCS_WR_RTYPE, val, reg, NULL, 0,
 264                                MOS_WDR_TIMEOUT);
 265 }
 266
 267 /*
 268  * mos7840_get_reg_sync
 269  *      To set the Uart register by calling usb_fill_control_urb function by
 270  *      passing usb_rcvctrlpipe function as parameter.
 271  */
 272
 273 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 274                                 __u16 *val)
 275 {
 276         struct usb_device *dev = port->serial->dev;
 277         int ret = 0;
 278         u8 *buf;
 279
 280         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 281         if (!buf)
 282                 return -ENOMEM;
 283
 284         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 285                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 286                               MOS_WDR_TIMEOUT);
 287         *val = buf[0];
 288         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 289
 290         kfree(buf);
 291         return ret;
 292 }
 293
 294 /*
 295  * mos7840_set_uart_reg
 296  *      To set the Uart register by calling usb_fill_control_urb function by
 297  *      passing usb_sndctrlpipe function as parameter.
 298  */
 299
 300 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 301                                 __u16 val)
 302 {
 303
 304         struct usb_device *dev = port->serial->dev;
 305         val = val & 0x00ff;
 306         /* For the UART control registers, the application number need
 307            to be Or'ed */
 308         if (port->serial->num_ports == 4) {
 309                 val |= (((__u16) port->number -
 310                                 (__u16) (port->serial->minor)) + 1) << 8;
 311         } else {
 312                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 313                         val |= (((__u16) port->number -
 314                               (__u16) (port->serial->minor)) + 1) << 8;
 315                 } else {
 316                         val |= (((__u16) port->number -
 317                               (__u16) (port->serial->minor)) + 2) << 8;
 318                 }
 319         }
 320         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 321         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 322                                MCS_WR_RTYPE, val, reg, NULL, 0,
 323                                MOS_WDR_TIMEOUT);
 324
 325 }
 326
 327 /*
 328  * mos7840_get_uart_reg
 329  *      To set the Control register by calling usb_fill_control_urb function
 330  *      by passing usb_rcvctrlpipe function as parameter.
 331  */
 332 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 333                                 __u16 *val)
 334 {
 335         struct usb_device *dev = port->serial->dev;
 336         int ret = 0;
 337         __u16 Wval;
 338         u8 *buf;
 339
 340         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 341         if (!buf)
 342                 return -ENOMEM;
 343
 344         /* Wval  is same as application number */
 345         if (port->serial->num_ports == 4) {
 346                 Wval =
 347                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 348                      1) << 8;
 349         } else {
 350                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 351                         Wval = (((__u16) port->number -
 352                               (__u16) (port->serial->minor)) + 1) << 8;
 353                 } else {
 354                         Wval = (((__u16) port->number -
 355                               (__u16) (port->serial->minor)) + 2) << 8;
 356                 }
 357         }
 358         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 359         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 360                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 361                               MOS_WDR_TIMEOUT);
 362         *val = buf[0];
 363
 364         kfree(buf);
 365         return ret;
 366 }
 367
 368 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 369                                      struct moschip_port *mos7840_port)
 370 {
 371
 372         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 373         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 374         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 375
 376 }
 377
 378 /************************************************************************/
 379 /************************************************************************/
 380 /*             I N T E R F A C E   F U N C T I O N S                    */
 381 /*             I N T E R F A C E   F U N C T I O N S                    */
 382 /************************************************************************/
 383 /************************************************************************/
 384
 385 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 386                                             struct moschip_port *data)
 387 {
 388         usb_set_serial_port_data(port, (void *)data);
 389 }
 390
 391 static inline struct moschip_port *mos7840_get_port_private(struct
 392                                                             usb_serial_port
 393                                                             *port)
 394 {
 395         return (struct moschip_port *)usb_get_serial_port_data(port);
 396 }
 397
 398 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 399 {
 400         struct moschip_port *mos7840_port;
 401         struct async_icount *icount;
 402         mos7840_port = port;
 403         icount = &mos7840_port->icount;
 404         if (new_msr &
 405             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 406              MOS_MSR_DELTA_CD)) {
 407                 icount = &mos7840_port->icount;
 408
 409                 /* update input line counters */
 410                 if (new_msr & MOS_MSR_DELTA_CTS) {
 411                         icount->cts++;
 412                         smp_wmb();
 413                 }
 414                 if (new_msr & MOS_MSR_DELTA_DSR) {
 415                         icount->dsr++;
 416                         smp_wmb();
 417                 }
 418                 if (new_msr & MOS_MSR_DELTA_CD) {
 419                         icount->dcd++;
 420                         smp_wmb();
 421                 }
 422                 if (new_msr & MOS_MSR_DELTA_RI) {
 423                         icount->rng++;
 424                         smp_wmb();
 425                 }
 426         }
 427 }
 428
 429 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 430 {
 431         struct async_icount *icount;
 432
 433         if (new_lsr & SERIAL_LSR_BI) {
 434                 /*
 435                  * Parity and Framing errors only count if they
 436                  * occur exclusive of a break being
 437                  * received.
 438                  */
 439                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 440         }
 441
 442         /* update input line counters */
 443         icount = &port->icount;
 444         if (new_lsr & SERIAL_LSR_BI) {
 445                 icount->brk++;
 446                 smp_wmb();
 447         }
 448         if (new_lsr & SERIAL_LSR_OE) {
 449                 icount->overrun++;
 450                 smp_wmb();
 451         }
 452         if (new_lsr & SERIAL_LSR_PE) {
 453                 icount->parity++;
 454                 smp_wmb();
 455         }
 456         if (new_lsr & SERIAL_LSR_FE) {
 457                 icount->frame++;
 458                 smp_wmb();
 459         }
 460 }
 461
 462 /************************************************************************/
 463 /************************************************************************/
 464 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 465 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 466 /************************************************************************/
 467 /************************************************************************/
 468
 469 static void mos7840_control_callback(struct urb *urb)
 470 {
 471         unsigned char *data;
 472         struct moschip_port *mos7840_port;
 473         struct device *dev = &urb->dev->dev;
 474         __u8 regval = 0x0;
 475         int status = urb->status;
 476
 477         mos7840_port = urb->context;
 478
 479         switch (status) {
 480         case 0:
 481                 /* success */
 482                 break;
 483         case -ECONNRESET:
 484         case -ENOENT:
 485         case -ESHUTDOWN:
 486                 /* this urb is terminated, clean up */
 487                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 488                 return;
 489         default:
 490                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 491                 return;
 492         }
 493
 494         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 495         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 496                 mos7840_port->MsrLsr, mos7840_port->port_num);
 497         data = urb->transfer_buffer;
 498         regval = (__u8) data[0];
 499         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 500         if (mos7840_port->MsrLsr == 0)
 501                 mos7840_handle_new_msr(mos7840_port, regval);
 502         else if (mos7840_port->MsrLsr == 1)
 503                 mos7840_handle_new_lsr(mos7840_port, regval);
 504 }
 505
 506 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 507                            __u16 *val)
 508 {
 509         struct usb_device *dev = mcs->port->serial->dev;
 510         struct usb_ctrlrequest *dr = mcs->dr;
 511         unsigned char *buffer = mcs->ctrl_buf;
 512         int ret;
 513
 514         dr->bRequestType = MCS_RD_RTYPE;
 515         dr->bRequest = MCS_RDREQ;
 516         dr->wValue = cpu_to_le16(Wval); /* 0 */
 517         dr->wIndex = cpu_to_le16(reg);
 518         dr->wLength = cpu_to_le16(2);
 519
 520         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 521                              (unsigned char *)dr, buffer, 2,
 522                              mos7840_control_callback, mcs);
 523         mcs->control_urb->transfer_buffer_length = 2;
 524         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 525         return ret;
 526 }
 527
 528 static void mos7840_set_led_callback(struct urb *urb)
 529 {
 530         switch (urb->status) {
 531         case 0:
 532                 /* Success */
 533                 break;
 534         case -ECONNRESET:
 535         case -ENOENT:
 536         case -ESHUTDOWN:
 537                 /* This urb is terminated, clean up */
 538                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 539                         __func__, urb->status);
 540                 break;
 541         default:
 542                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 543                         __func__, urb->status);
 544         }
 545 }
 546
 547 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 548                                 __u16 reg)
 549 {
 550         struct usb_device *dev = mcs->port->serial->dev;
 551         struct usb_ctrlrequest *dr = mcs->dr;
 552
 553         dr->bRequestType = MCS_WR_RTYPE;
 554         dr->bRequest = MCS_WRREQ;
 555         dr->wValue = cpu_to_le16(wval);
 556         dr->wIndex = cpu_to_le16(reg);
 557         dr->wLength = cpu_to_le16(0);
 558
 559         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 560                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 561
 562         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 563 }
 564
 565 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 566                                 __u16 val)
 567 {
 568         struct usb_device *dev = port->serial->dev;
 569
 570         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 571                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 572 }
 573
 574 static void mos7840_led_off(unsigned long arg)
 575 {
 576         struct moschip_port *mcs = (struct moschip_port *) arg;
 577
 578         /* Turn off LED */
 579         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 580         mod_timer(&mcs->led_timer2,
 581                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 582 }
 583
 584 static void mos7840_led_flag_off(unsigned long arg)
 585 {
 586         struct moschip_port *mcs = (struct moschip_port *) arg;
 587
 588         mcs->led_flag = false;
 589 }
 590
 591 /*****************************************************************************
 592  * mos7840_interrupt_callback
 593  *      this is the callback function for when we have received data on the
 594  *      interrupt endpoint.
 595  *****************************************************************************/
 596
 597 static void mos7840_interrupt_callback(struct urb *urb)
 598 {
 599         int result;
 600         int length;
 601         struct moschip_port *mos7840_port;
 602         struct usb_serial *serial;
 603         __u16 Data;
 604         unsigned char *data;
 605         __u8 sp[5], st;
 606         int i, rv = 0;
 607         __u16 wval, wreg = 0;
 608         int status = urb->status;
 609
 610         switch (status) {
 611         case 0:
 612                 /* success */
 613                 break;
 614         case -ECONNRESET:
 615         case -ENOENT:
 616         case -ESHUTDOWN:
 617                 /* this urb is terminated, clean up */
 618                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 619                         __func__, status);
 620                 return;
 621         default:
 622                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 623                         __func__, status);
 624                 goto exit;
 625         }
 626
 627         length = urb->actual_length;
 628         data = urb->transfer_buffer;
 629
 630         serial = urb->context;
 631
 632         /* Moschip get 5 bytes
 633          * Byte 1 IIR Port 1 (port.number is 0)
 634          * Byte 2 IIR Port 2 (port.number is 1)
 635          * Byte 3 IIR Port 3 (port.number is 2)
 636          * Byte 4 IIR Port 4 (port.number is 3)
 637          * Byte 5 FIFO status for both */
 638
 639         if (length && length > 5) {
 640                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 641                 return;
 642         }
 643
 644         sp[0] = (__u8) data[0];
 645         sp[1] = (__u8) data[1];
 646         sp[2] = (__u8) data[2];
 647         sp[3] = (__u8) data[3];
 648         st = (__u8) data[4];
 649
 650         for (i = 0; i < serial->num_ports; i++) {
 651                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 652                 wval =
 653                     (((__u16) serial->port[i]->number -
 654                       (__u16) (serial->minor)) + 1) << 8;
 655                 if (mos7840_port->open) {
 656                         if (sp[i] & 0x01) {
 657                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 658                         } else {
 659                                 switch (sp[i] & 0x0f) {
 660                                 case SERIAL_IIR_RLS:
 661                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 662                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 663                                         mos7840_port->MsrLsr = 1;
 664                                         wreg = LINE_STATUS_REGISTER;
 665                                         break;
 666                                 case SERIAL_IIR_MS:
 667                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 668                                         mos7840_port->MsrLsr = 0;
 669                                         wreg = MODEM_STATUS_REGISTER;
 670                                         break;
 671                                 }
 672                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 673                         }
 674                 }
 675         }
 676         if (!(rv < 0))
 677                 /* the completion handler for the control urb will resubmit */
 678                 return;
 679 exit:
 680         result = usb_submit_urb(urb, GFP_ATOMIC);
 681         if (result) {
 682                 dev_err(&urb->dev->dev,
 683                         "%s - Error %d submitting interrupt urb\n",
 684                         __func__, result);
 685         }
 686 }
 687
 688 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 689                                        const char *function)
 690 {
 691         if (!port) {
 692                 pr_debug("%s - port == NULL\n", function);
 693                 return -1;
 694         }
 695         if (!port->serial) {
 696                 pr_debug("%s - port->serial == NULL\n", function);
 697                 return -1;
 698         }
 699
 700         return 0;
 701 }
 702
 703 /* Inline functions to check the sanity of a pointer that is passed to us */
 704 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 705                                          const char *function)
 706 {
 707         if (!serial) {
 708                 pr_debug("%s - serial == NULL\n", function);
 709                 return -1;
 710         }
 711         if (!serial->type) {
 712                 pr_debug("%s - serial->type == NULL!\n", function);
 713                 return -1;
 714         }
 715
 716         return 0;
 717 }
 718
 719 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 720                                                  const char *function)
 721 {
 722         /* if no port was specified, or it fails a paranoia check */
 723         if (!port ||
 724             mos7840_port_paranoia_check(port, function) ||
 725             mos7840_serial_paranoia_check(port->serial, function)) {
 726                 /* then say that we don't have a valid usb_serial thing,
 727                  * which will end up genrating -ENODEV return values */
 728                 return NULL;
 729         }
 730
 731         return port->serial;
 732 }
 733
 734 /*****************************************************************************
 735  * mos7840_bulk_in_callback
 736  *      this is the callback function for when we have received data on the
 737  *      bulk in endpoint.
 738  *****************************************************************************/
 739
 740 static void mos7840_bulk_in_callback(struct urb *urb)
 741 {
 742         int retval;
 743         unsigned char *data;
 744         struct usb_serial *serial;
 745         struct usb_serial_port *port;
 746         struct moschip_port *mos7840_port;
 747         struct tty_struct *tty;
 748         int status = urb->status;
 749
 750         mos7840_port = urb->context;
 751         if (!mos7840_port)
 752                 return;
 753
 754         if (status) {
 755                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 756                 mos7840_port->read_urb_busy = false;
 757                 return;
 758         }
 759
 760         port = mos7840_port->port;
 761         if (mos7840_port_paranoia_check(port, __func__)) {
 762                 mos7840_port->read_urb_busy = false;
 763                 return;
 764         }
 765
 766         serial = mos7840_get_usb_serial(port, __func__);
 767         if (!serial) {
 768                 mos7840_port->read_urb_busy = false;
 769                 return;
 770         }
 771
 772         data = urb->transfer_buffer;
 773         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 774
 775         if (urb->actual_length) {
 776                 tty = tty_port_tty_get(&mos7840_port->port->port);
 777                 if (tty) {
 778                         tty_insert_flip_string(tty, data, urb->actual_length);
 779                         tty_flip_buffer_push(tty);
 780                         tty_kref_put(tty);
 781                 }
 782                 mos7840_port->icount.rx += urb->actual_length;
 783                 smp_wmb();
 784                 dev_dbg(&port->dev, "mos7840_port->icount.rx is %d:\n", mos7840_port->icount.rx);
 785         }
 786
 787         if (!mos7840_port->read_urb) {
 788                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 789                 mos7840_port->read_urb_busy = false;
 790                 return;
 791         }
 792
 793         /* Turn on LED */
 794         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 795                 mos7840_port->led_flag = true;
 796                 mos7840_set_led_async(mos7840_port, 0x0301,
 797                                         MODEM_CONTROL_REGISTER);
 798                 mod_timer(&mos7840_port->led_timer1,
 799                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 800         }
 801
 802         mos7840_port->read_urb_busy = true;
 803         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 804
 805         if (retval) {
 806                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 807                 mos7840_port->read_urb_busy = false;
 808         }
 809 }
 810
 811 /*****************************************************************************
 812  * mos7840_bulk_out_data_callback
 813  *      this is the callback function for when we have finished sending
 814  *      serial data on the bulk out endpoint.
 815  *****************************************************************************/
 816
 817 static void mos7840_bulk_out_data_callback(struct urb *urb)
 818 {
 819         struct moschip_port *mos7840_port;
 820         struct usb_serial_port *port;
 821         struct tty_struct *tty;
 822         int status = urb->status;
 823         int i;
 824
 825         mos7840_port = urb->context;
 826         port = mos7840_port->port;
 827         spin_lock(&mos7840_port->pool_lock);
 828         for (i = 0; i < NUM_URBS; i++) {
 829                 if (urb == mos7840_port->write_urb_pool[i]) {
 830                         mos7840_port->busy[i] = 0;
 831                         break;
 832                 }
 833         }
 834         spin_unlock(&mos7840_port->pool_lock);
 835
 836         if (status) {
 837                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 838                 return;
 839         }
 840
 841         if (mos7840_port_paranoia_check(port, __func__))
 842                 return;
 843
 844         tty = tty_port_tty_get(&port->port);
 845         if (tty && mos7840_port->open)
 846                 tty_wakeup(tty);
 847         tty_kref_put(tty);
 848
 849 }
 850
 851 /************************************************************************/
 852 /*       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       */
 853 /************************************************************************/
 854 #ifdef MCSSerialProbe
 855 static int mos7840_serial_probe(struct usb_serial *serial,
 856                                 const struct usb_device_id *id)
 857 {
 858
 859         /*need to implement the mode_reg reading and updating\
 860            structures usb_serial_ device_type\
 861            (i.e num_ports, num_bulkin,bulkout etc) */
 862         /* Also we can update the changes  attach */
 863         return 1;
 864 }
 865 #endif
 866
 867 /*****************************************************************************
 868  * mos7840_open
 869  *      this function is called by the tty driver when a port is opened
 870  *      If successful, we return 0
 871  *      Otherwise we return a negative error number.
 872  *****************************************************************************/
 873
 874 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 875 {
 876         int response;
 877         int j;
 878         struct usb_serial *serial;
 879         struct urb *urb;
 880         __u16 Data;
 881         int status;
 882         struct moschip_port *mos7840_port;
 883         struct moschip_port *port0;
 884
 885         if (mos7840_port_paranoia_check(port, __func__))
 886                 return -ENODEV;
 887
 888         serial = port->serial;
 889
 890         if (mos7840_serial_paranoia_check(serial, __func__))
 891                 return -ENODEV;
 892
 893         mos7840_port = mos7840_get_port_private(port);
 894         port0 = mos7840_get_port_private(serial->port[0]);
 895
 896         if (mos7840_port == NULL || port0 == NULL)
 897                 return -ENODEV;
 898
 899         usb_clear_halt(serial->dev, port->write_urb->pipe);
 900         usb_clear_halt(serial->dev, port->read_urb->pipe);
 901         port0->open_ports++;
 902
 903         /* Initialising the write urb pool */
 904         for (j = 0; j < NUM_URBS; ++j) {
 905                 urb = usb_alloc_urb(0, GFP_KERNEL);
 906                 mos7840_port->write_urb_pool[j] = urb;
 907
 908                 if (urb == NULL) {
 909                         dev_err(&port->dev, "No more urbs???\n");
 910                         continue;
 911                 }
 912
 913                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 914                                                                 GFP_KERNEL);
 915                 if (!urb->transfer_buffer) {
 916                         usb_free_urb(urb);
 917                         mos7840_port->write_urb_pool[j] = NULL;
 918                         dev_err(&port->dev,
 919                                 "%s-out of memory for urb buffers.\n",
 920                                 __func__);
 921                         continue;
 922                 }
 923         }
 924
 925 /*****************************************************************************
 926  * Initialize MCS7840 -- Write Init values to corresponding Registers
 927  *
 928  * Register Index
 929  * 1 : IER
 930  * 2 : FCR
 931  * 3 : LCR
 932  * 4 : MCR
 933  *
 934  * 0x08 : SP1/2 Control Reg
 935  *****************************************************************************/
 936
 937         /* NEED to check the following Block */
 938
 939         Data = 0x0;
 940         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 941         if (status < 0) {
 942                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 943                 return -1;
 944         }
 945         Data |= 0x80;
 946         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 947         if (status < 0) {
 948                 dev_dbg(&port->dev, "writing Spreg failed\n");
 949                 return -1;
 950         }
 951
 952         Data &= ~0x80;
 953         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 954         if (status < 0) {
 955                 dev_dbg(&port->dev, "writing Spreg failed\n");
 956                 return -1;
 957         }
 958         /* End of block to be checked */
 959
 960         Data = 0x0;
 961         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 962                                                                         &Data);
 963         if (status < 0) {
 964                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 965                 return -1;
 966         }
 967         Data |= 0x08;           /* Driver done bit */
 968         Data |= 0x20;           /* rx_disable */
 969         status = mos7840_set_reg_sync(port,
 970                                 mos7840_port->ControlRegOffset, Data);
 971         if (status < 0) {
 972                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 973                 return -1;
 974         }
 975         /* do register settings here */
 976         /* Set all regs to the device default values. */
 977         /***********************************
 978          * First Disable all interrupts.
 979          ***********************************/
 980         Data = 0x00;
 981         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 982         if (status < 0) {
 983                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 984                 return -1;
 985         }
 986         /* Set FIFO_CONTROL_REGISTER to the default value */
 987         Data = 0x00;
 988         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 989         if (status < 0) {
 990                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 991                 return -1;
 992         }
 993
 994         Data = 0xcf;
 995         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 996         if (status < 0) {
 997                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 998                 return -1;
 999         }
1000
1001         Data = 0x03;
1002         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1003         mos7840_port->shadowLCR = Data;
1004
1005         Data = 0x0b;
1006         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1007         mos7840_port->shadowMCR = Data;
1008
1009         Data = 0x00;
1010         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1011         mos7840_port->shadowLCR = Data;
1012
1013         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1014         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1015
1016         Data = 0x0c;
1017         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1018
1019         Data = 0x0;
1020         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1021
1022         Data = 0x00;
1023         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1024
1025         Data = Data & ~SERIAL_LCR_DLAB;
1026         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1027         mos7840_port->shadowLCR = Data;
1028
1029         /* clearing Bulkin and Bulkout Fifo */
1030         Data = 0x0;
1031         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1032
1033         Data = Data | 0x0c;
1034         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1035
1036         Data = Data & ~0x0c;
1037         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1038         /* Finally enable all interrupts */
1039         Data = 0x0c;
1040         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1041
1042         /* clearing rx_disable */
1043         Data = 0x0;
1044         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1045                                                                         &Data);
1046         Data = Data & ~0x20;
1047         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1048                                                                         Data);
1049
1050         /* rx_negate */
1051         Data = 0x0;
1052         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1053                                                                         &Data);
1054         Data = Data | 0x10;
1055         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1056                                                                         Data);
1057
1058         /* Check to see if we've set up our endpoint info yet    *
1059          * (can't set it up in mos7840_startup as the structures *
1060          * were not set up at that time.)                        */
1061         if (port0->open_ports == 1) {
1062                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1063                         /* set up interrupt urb */
1064                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1065                                 serial->dev,
1066                                 usb_rcvintpipe(serial->dev,
1067                                 serial->port[0]->interrupt_in_endpointAddress),
1068                                 serial->port[0]->interrupt_in_buffer,
1069                                 serial->port[0]->interrupt_in_urb->
1070                                 transfer_buffer_length,
1071                                 mos7840_interrupt_callback,
1072                                 serial,
1073                                 serial->port[0]->interrupt_in_urb->interval);
1074
1075                         /* start interrupt read for mos7840               *
1076                          * will continue as long as mos7840 is connected  */
1077
1078                         response =
1079                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1080                                            GFP_KERNEL);
1081                         if (response) {
1082                                 dev_err(&port->dev, "%s - Error %d submitting "
1083                                         "interrupt urb\n", __func__, response);
1084                         }
1085
1086                 }
1087
1088         }
1089
1090         /* see if we've set up our endpoint info yet   *
1091          * (can't set it up in mos7840_startup as the  *
1092          * structures were not set up at that time.)   */
1093
1094         dev_dbg(&port->dev, "port number is %d\n", port->number);
1095         dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
1096         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1097         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1098         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1099         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1100         mos7840_port->read_urb = port->read_urb;
1101
1102         /* set up our bulk in urb */
1103         if ((serial->num_ports == 2)
1104                 && ((((__u16)port->number -
1105                         (__u16)(port->serial->minor)) % 2) != 0)) {
1106                 usb_fill_bulk_urb(mos7840_port->read_urb,
1107                         serial->dev,
1108                         usb_rcvbulkpipe(serial->dev,
1109                                 (port->bulk_in_endpointAddress) + 2),
1110                         port->bulk_in_buffer,
1111                         mos7840_port->read_urb->transfer_buffer_length,
1112                         mos7840_bulk_in_callback, mos7840_port);
1113         } else {
1114                 usb_fill_bulk_urb(mos7840_port->read_urb,
1115                         serial->dev,
1116                         usb_rcvbulkpipe(serial->dev,
1117                                 port->bulk_in_endpointAddress),
1118                         port->bulk_in_buffer,
1119                         mos7840_port->read_urb->transfer_buffer_length,
1120                         mos7840_bulk_in_callback, mos7840_port);
1121         }
1122
1123         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1124         mos7840_port->read_urb_busy = true;
1125         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1126         if (response) {
1127                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1128                         __func__, response);
1129                 mos7840_port->read_urb_busy = false;
1130         }
1131
1132         /* initialize our wait queues */
1133         init_waitqueue_head(&mos7840_port->wait_chase);
1134         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1135
1136         /* initialize our icount structure */
1137         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1138
1139         /* initialize our port settings */
1140         /* Must set to enable ints! */
1141         mos7840_port->shadowMCR = MCR_MASTER_IE;
1142         /* send a open port command */
1143         mos7840_port->open = 1;
1144         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1145         mos7840_port->icount.tx = 0;
1146         mos7840_port->icount.rx = 0;
1147
1148         return 0;
1149 }
1150
1151 /*****************************************************************************
1152  * mos7840_chars_in_buffer
1153  *      this function is called by the tty driver when it wants to know how many
1154  *      bytes of data we currently have outstanding in the port (data that has
1155  *      been written, but hasn't made it out the port yet)
1156  *      If successful, we return the number of bytes left to be written in the
1157  *      system,
1158  *      Otherwise we return zero.
1159  *****************************************************************************/
1160
1161 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1162 {
1163         struct usb_serial_port *port = tty->driver_data;
1164         int i;
1165         int chars = 0;
1166         unsigned long flags;
1167         struct moschip_port *mos7840_port;
1168
1169         if (mos7840_port_paranoia_check(port, __func__))
1170                 return 0;
1171
1172         mos7840_port = mos7840_get_port_private(port);
1173         if (mos7840_port == NULL)
1174                 return 0;
1175
1176         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1177         for (i = 0; i < NUM_URBS; ++i) {
1178                 if (mos7840_port->busy[i]) {
1179                         struct urb *urb = mos7840_port->write_urb_pool[i];
1180                         chars += urb->transfer_buffer_length;
1181                 }
1182         }
1183         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1184         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1185         return chars;
1186
1187 }
1188
1189 /*****************************************************************************
1190  * mos7840_close
1191  *      this function is called by the tty driver when a port is closed
1192  *****************************************************************************/
1193
1194 static void mos7840_close(struct usb_serial_port *port)
1195 {
1196         struct usb_serial *serial;
1197         struct moschip_port *mos7840_port;
1198         struct moschip_port *port0;
1199         int j;
1200         __u16 Data;
1201
1202         if (mos7840_port_paranoia_check(port, __func__))
1203                 return;
1204
1205         serial = mos7840_get_usb_serial(port, __func__);
1206         if (!serial)
1207                 return;
1208
1209         mos7840_port = mos7840_get_port_private(port);
1210         port0 = mos7840_get_port_private(serial->port[0]);
1211
1212         if (mos7840_port == NULL || port0 == NULL)
1213                 return;
1214
1215         for (j = 0; j < NUM_URBS; ++j)
1216                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1217
1218         /* Freeing Write URBs */
1219         for (j = 0; j < NUM_URBS; ++j) {
1220                 if (mos7840_port->write_urb_pool[j]) {
1221                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1222                                 kfree(mos7840_port->write_urb_pool[j]->
1223                                       transfer_buffer);
1224
1225                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1226                 }
1227         }
1228
1229         /* While closing port, shutdown all bulk read, write  *
1230          * and interrupt read if they exists                  */
1231         if (serial->dev) {
1232                 if (mos7840_port->write_urb) {
1233                         dev_dbg(&port->dev, "%s", "Shutdown bulk write\n");
1234                         usb_kill_urb(mos7840_port->write_urb);
1235                 }
1236                 if (mos7840_port->read_urb) {
1237                         dev_dbg(&port->dev, "%s", "Shutdown bulk read\n");
1238                         usb_kill_urb(mos7840_port->read_urb);
1239                         mos7840_port->read_urb_busy = false;
1240                 }
1241                 if ((&mos7840_port->control_urb)) {
1242                         dev_dbg(&port->dev, "%s", "Shutdown control read\n");
1243                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1244                 }
1245         }
1246 /*      if(mos7840_port->ctrl_buf != NULL) */
1247 /*              kfree(mos7840_port->ctrl_buf); */
1248         port0->open_ports--;
1249         dev_dbg(&port->dev, "%s in close%d:in port%d\n", __func__, port0->open_ports, port->number);
1250         if (port0->open_ports == 0) {
1251                 if (serial->port[0]->interrupt_in_urb) {
1252                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1253                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1254                 }
1255         }
1256
1257         if (mos7840_port->write_urb) {
1258                 /* if this urb had a transfer buffer already (old tx) free it */
1259                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1260                         kfree(mos7840_port->write_urb->transfer_buffer);
1261                 usb_free_urb(mos7840_port->write_urb);
1262         }
1263
1264         Data = 0x0;
1265         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1266
1267         Data = 0x00;
1268         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1269
1270         mos7840_port->open = 0;
1271 }
1272
1273 /************************************************************************
1274  *
1275  * mos7840_block_until_chase_response
1276  *
1277  *      This function will block the close until one of the following:
1278  *              1. Response to our Chase comes from mos7840
1279  *              2. A timeout of 10 seconds without activity has expired
1280  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1281  *
1282  ************************************************************************/
1283
1284 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1285                                         struct moschip_port *mos7840_port)
1286 {
1287         int timeout = msecs_to_jiffies(1000);
1288         int wait = 10;
1289         int count;
1290
1291         while (1) {
1292                 count = mos7840_chars_in_buffer(tty);
1293
1294                 /* Check for Buffer status */
1295                 if (count <= 0)
1296                         return;
1297
1298                 /* Block the thread for a while */
1299                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1300                                                timeout);
1301                 /* No activity.. count down section */
1302                 wait--;
1303                 if (wait == 0) {
1304                         dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1305                         return;
1306                 } else {
1307                         /* Reset timeout value back to seconds */
1308                         wait = 10;
1309                 }
1310         }
1311
1312 }
1313
1314 /*****************************************************************************
1315  * mos7840_break
1316  *      this function sends a break to the port
1317  *****************************************************************************/
1318 static void mos7840_break(struct tty_struct *tty, int break_state)
1319 {
1320         struct usb_serial_port *port = tty->driver_data;
1321         unsigned char data;
1322         struct usb_serial *serial;
1323         struct moschip_port *mos7840_port;
1324
1325         if (mos7840_port_paranoia_check(port, __func__))
1326                 return;
1327
1328         serial = mos7840_get_usb_serial(port, __func__);
1329         if (!serial)
1330                 return;
1331
1332         mos7840_port = mos7840_get_port_private(port);
1333
1334         if (mos7840_port == NULL)
1335                 return;
1336
1337         if (serial->dev)
1338                 /* flush and block until tx is empty */
1339                 mos7840_block_until_chase_response(tty, mos7840_port);
1340
1341         if (break_state == -1)
1342                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1343         else
1344                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1345
1346         /* FIXME: no locking on shadowLCR anywhere in driver */
1347         mos7840_port->shadowLCR = data;
1348         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1349         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1350                              mos7840_port->shadowLCR);
1351 }
1352
1353 /*****************************************************************************
1354  * mos7840_write_room
1355  *      this function is called by the tty driver when it wants to know how many
1356  *      bytes of data we can accept for a specific port.
1357  *      If successful, we return the amount of room that we have for this port
1358  *      Otherwise we return a negative error number.
1359  *****************************************************************************/
1360
1361 static int mos7840_write_room(struct tty_struct *tty)
1362 {
1363         struct usb_serial_port *port = tty->driver_data;
1364         int i;
1365         int room = 0;
1366         unsigned long flags;
1367         struct moschip_port *mos7840_port;
1368
1369         if (mos7840_port_paranoia_check(port, __func__))
1370                 return -1;
1371
1372         mos7840_port = mos7840_get_port_private(port);
1373         if (mos7840_port == NULL)
1374                 return -1;
1375
1376         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1377         for (i = 0; i < NUM_URBS; ++i) {
1378                 if (!mos7840_port->busy[i])
1379                         room += URB_TRANSFER_BUFFER_SIZE;
1380         }
1381         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1382
1383         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1384         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1385         return room;
1386
1387 }
1388
1389 /*****************************************************************************
1390  * mos7840_write
1391  *      this function is called by the tty driver when data should be written to
1392  *      the port.
1393  *      If successful, we return the number of bytes written, otherwise we
1394  *      return a negative error number.
1395  *****************************************************************************/
1396
1397 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1398                          const unsigned char *data, int count)
1399 {
1400         int status;
1401         int i;
1402         int bytes_sent = 0;
1403         int transfer_size;
1404         unsigned long flags;
1405
1406         struct moschip_port *mos7840_port;
1407         struct usb_serial *serial;
1408         struct urb *urb;
1409         /* __u16 Data; */
1410         const unsigned char *current_position = data;
1411         unsigned char *data1;
1412
1413 #ifdef NOTMOS7840
1414         Data = 0x00;
1415         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1416         mos7840_port->shadowLCR = Data;
1417         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1418         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1419
1420         /* Data = 0x03; */
1421         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1422         /* mos7840_port->shadowLCR=Data;//Need to add later */
1423
1424         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1425         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1426
1427         /* Data = 0x0c; */
1428         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1429         Data = 0x00;
1430         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1431         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1432
1433         Data = 0x0;
1434         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1435         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1436
1437         Data = Data & ~SERIAL_LCR_DLAB;
1438         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1439         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1440 #endif
1441
1442         if (mos7840_port_paranoia_check(port, __func__))
1443                 return -1;
1444
1445         serial = port->serial;
1446         if (mos7840_serial_paranoia_check(serial, __func__))
1447                 return -1;
1448
1449         mos7840_port = mos7840_get_port_private(port);
1450         if (mos7840_port == NULL)
1451                 return -1;
1452
1453         /* try to find a free urb in the list */
1454         urb = NULL;
1455
1456         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1457         for (i = 0; i < NUM_URBS; ++i) {
1458                 if (!mos7840_port->busy[i]) {
1459                         mos7840_port->busy[i] = 1;
1460                         urb = mos7840_port->write_urb_pool[i];
1461                         dev_dbg(&port->dev, "URB:%d\n", i);
1462                         break;
1463                 }
1464         }
1465         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1466
1467         if (urb == NULL) {
1468                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1469                 goto exit;
1470         }
1471
1472         if (urb->transfer_buffer == NULL) {
1473                 urb->transfer_buffer =
1474                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1475
1476                 if (urb->transfer_buffer == NULL) {
1477                         dev_err_console(port, "%s no more kernel memory...\n",
1478                                 __func__);
1479                         goto exit;
1480                 }
1481         }
1482         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1483
1484         memcpy(urb->transfer_buffer, current_position, transfer_size);
1485
1486         /* fill urb with data and submit  */
1487         if ((serial->num_ports == 2)
1488                 && ((((__u16)port->number -
1489                         (__u16)(port->serial->minor)) % 2) != 0)) {
1490                 usb_fill_bulk_urb(urb,
1491                         serial->dev,
1492                         usb_sndbulkpipe(serial->dev,
1493                                 (port->bulk_out_endpointAddress) + 2),
1494                         urb->transfer_buffer,
1495                         transfer_size,
1496                         mos7840_bulk_out_data_callback, mos7840_port);
1497         } else {
1498                 usb_fill_bulk_urb(urb,
1499                         serial->dev,
1500                         usb_sndbulkpipe(serial->dev,
1501                                 port->bulk_out_endpointAddress),
1502                         urb->transfer_buffer,
1503                         transfer_size,
1504                         mos7840_bulk_out_data_callback, mos7840_port);
1505         }
1506
1507         data1 = urb->transfer_buffer;
1508         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1509
1510         /* Turn on LED */
1511         if (mos7840_port->has_led && !mos7840_port->led_flag) {
1512                 mos7840_port->led_flag = true;
1513                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1514                 mod_timer(&mos7840_port->led_timer1,
1515                                 jiffies + msecs_to_jiffies(LED_ON_MS));
1516         }
1517
1518         /* send it down the pipe */
1519         status = usb_submit_urb(urb, GFP_ATOMIC);
1520
1521         if (status) {
1522                 mos7840_port->busy[i] = 0;
1523                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1524                         "with status = %d\n", __func__, status);
1525                 bytes_sent = status;
1526                 goto exit;
1527         }
1528         bytes_sent = transfer_size;
1529         mos7840_port->icount.tx += transfer_size;
1530         smp_wmb();
1531         dev_dbg(&port->dev, "mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1532 exit:
1533         return bytes_sent;
1534
1535 }
1536
1537 /*****************************************************************************
1538  * mos7840_throttle
1539  *      this function is called by the tty driver when it wants to stop the data
1540  *      being read from the port.
1541  *****************************************************************************/
1542
1543 static void mos7840_throttle(struct tty_struct *tty)
1544 {
1545         struct usb_serial_port *port = tty->driver_data;
1546         struct moschip_port *mos7840_port;
1547         int status;
1548
1549         if (mos7840_port_paranoia_check(port, __func__))
1550                 return;
1551
1552         mos7840_port = mos7840_get_port_private(port);
1553
1554         if (mos7840_port == NULL)
1555                 return;
1556
1557         if (!mos7840_port->open) {
1558                 dev_dbg(&port->dev, "%s", "port not opened\n");
1559                 return;
1560         }
1561
1562         /* if we are implementing XON/XOFF, send the stop character */
1563         if (I_IXOFF(tty)) {
1564                 unsigned char stop_char = STOP_CHAR(tty);
1565                 status = mos7840_write(tty, port, &stop_char, 1);
1566                 if (status <= 0)
1567                         return;
1568         }
1569         /* if we are implementing RTS/CTS, toggle that line */
1570         if (tty->termios.c_cflag & CRTSCTS) {
1571                 mos7840_port->shadowMCR &= ~MCR_RTS;
1572                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1573                                          mos7840_port->shadowMCR);
1574                 if (status < 0)
1575                         return;
1576         }
1577 }
1578
1579 /*****************************************************************************
1580  * mos7840_unthrottle
1581  *      this function is called by the tty driver when it wants to resume
1582  *      the data being read from the port (called after mos7840_throttle is
1583  *      called)
1584  *****************************************************************************/
1585 static void mos7840_unthrottle(struct tty_struct *tty)
1586 {
1587         struct usb_serial_port *port = tty->driver_data;
1588         int status;
1589         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1590
1591         if (mos7840_port_paranoia_check(port, __func__))
1592                 return;
1593
1594         if (mos7840_port == NULL)
1595                 return;
1596
1597         if (!mos7840_port->open) {
1598                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1599                 return;
1600         }
1601
1602         /* if we are implementing XON/XOFF, send the start character */
1603         if (I_IXOFF(tty)) {
1604                 unsigned char start_char = START_CHAR(tty);
1605                 status = mos7840_write(tty, port, &start_char, 1);
1606                 if (status <= 0)
1607                         return;
1608         }
1609
1610         /* if we are implementing RTS/CTS, toggle that line */
1611         if (tty->termios.c_cflag & CRTSCTS) {
1612                 mos7840_port->shadowMCR |= MCR_RTS;
1613                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1614                                          mos7840_port->shadowMCR);
1615                 if (status < 0)
1616                         return;
1617         }
1618 }
1619
1620 static int mos7840_tiocmget(struct tty_struct *tty)
1621 {
1622         struct usb_serial_port *port = tty->driver_data;
1623         struct moschip_port *mos7840_port;
1624         unsigned int result;
1625         __u16 msr;
1626         __u16 mcr;
1627         int status;
1628         mos7840_port = mos7840_get_port_private(port);
1629
1630         if (mos7840_port == NULL)
1631                 return -ENODEV;
1632
1633         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1634         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1635         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1636             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1637             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1638             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1639             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1640             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1641             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1642
1643         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1644
1645         return result;
1646 }
1647
1648 static int mos7840_tiocmset(struct tty_struct *tty,
1649                             unsigned int set, unsigned int clear)
1650 {
1651         struct usb_serial_port *port = tty->driver_data;
1652         struct moschip_port *mos7840_port;
1653         unsigned int mcr;
1654         int status;
1655
1656         mos7840_port = mos7840_get_port_private(port);
1657
1658         if (mos7840_port == NULL)
1659                 return -ENODEV;
1660
1661         /* FIXME: What locks the port registers ? */
1662         mcr = mos7840_port->shadowMCR;
1663         if (clear & TIOCM_RTS)
1664                 mcr &= ~MCR_RTS;
1665         if (clear & TIOCM_DTR)
1666                 mcr &= ~MCR_DTR;
1667         if (clear & TIOCM_LOOP)
1668                 mcr &= ~MCR_LOOPBACK;
1669
1670         if (set & TIOCM_RTS)
1671                 mcr |= MCR_RTS;
1672         if (set & TIOCM_DTR)
1673                 mcr |= MCR_DTR;
1674         if (set & TIOCM_LOOP)
1675                 mcr |= MCR_LOOPBACK;
1676
1677         mos7840_port->shadowMCR = mcr;
1678
1679         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1680         if (status < 0) {
1681                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1682                 return status;
1683         }
1684
1685         return 0;
1686 }
1687
1688 /*****************************************************************************
1689  * mos7840_calc_baud_rate_divisor
1690  *      this function calculates the proper baud rate divisor for the specified
1691  *      baud rate.
1692  *****************************************************************************/
1693 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1694                                           int baudRate, int *divisor,
1695                                           __u16 *clk_sel_val)
1696 {
1697         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1698
1699         if (baudRate <= 115200) {
1700                 *divisor = 115200 / baudRate;
1701                 *clk_sel_val = 0x0;
1702         }
1703         if ((baudRate > 115200) && (baudRate <= 230400)) {
1704                 *divisor = 230400 / baudRate;
1705                 *clk_sel_val = 0x10;
1706         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1707                 *divisor = 403200 / baudRate;
1708                 *clk_sel_val = 0x20;
1709         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1710                 *divisor = 460800 / baudRate;
1711                 *clk_sel_val = 0x30;
1712         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1713                 *divisor = 806400 / baudRate;
1714                 *clk_sel_val = 0x40;
1715         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1716                 *divisor = 921600 / baudRate;
1717                 *clk_sel_val = 0x50;
1718         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1719                 *divisor = 1572864 / baudRate;
1720                 *clk_sel_val = 0x60;
1721         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1722                 *divisor = 3145728 / baudRate;
1723                 *clk_sel_val = 0x70;
1724         }
1725         return 0;
1726
1727 #ifdef NOTMCS7840
1728
1729         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1730                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1731                         *divisor = mos7840_divisor_table[i].Divisor;
1732                         return 0;
1733                 }
1734         }
1735
1736         /* After trying for all the standard baud rates    *
1737          * Try calculating the divisor for this baud rate  */
1738
1739         if (baudrate > 75 && baudrate < 230400) {
1740                 /* get the divisor */
1741                 custom = (__u16) (230400L / baudrate);
1742
1743                 /* Check for round off */
1744                 round1 = (__u16) (2304000L / baudrate);
1745                 round = (__u16) (round1 - (custom * 10));
1746                 if (round > 4)
1747                         custom++;
1748                 *divisor = custom;
1749
1750                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1751                 return 0;
1752         }
1753
1754         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1755         return -1;
1756 #endif
1757 }
1758
1759 /*****************************************************************************
1760  * mos7840_send_cmd_write_baud_rate
1761  *      this function sends the proper command to change the baud rate of the
1762  *      specified port.
1763  *****************************************************************************/
1764
1765 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1766                                             int baudRate)
1767 {
1768         int divisor = 0;
1769         int status;
1770         __u16 Data;
1771         unsigned char number;
1772         __u16 clk_sel_val;
1773         struct usb_serial_port *port;
1774
1775         if (mos7840_port == NULL)
1776                 return -1;
1777
1778         port = mos7840_port->port;
1779         if (mos7840_port_paranoia_check(port, __func__))
1780                 return -1;
1781
1782         if (mos7840_serial_paranoia_check(port->serial, __func__))
1783                 return -1;
1784
1785         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1786
1787         dev_dbg(&port->dev, "%s - port = %d, baud = %d\n", __func__,
1788                 mos7840_port->port->number, baudRate);
1789         /* reset clk_uart_sel in spregOffset */
1790         if (baudRate > 115200) {
1791 #ifdef HW_flow_control
1792                 /* NOTE: need to see the pther register to modify */
1793                 /* setting h/w flow control bit to 1 */
1794                 Data = 0x2b;
1795                 mos7840_port->shadowMCR = Data;
1796                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1797                                                                         Data);
1798                 if (status < 0) {
1799                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1800                         return -1;
1801                 }
1802 #endif
1803
1804         } else {
1805 #ifdef HW_flow_control
1806                 /* setting h/w flow control bit to 0 */
1807                 Data = 0xb;
1808                 mos7840_port->shadowMCR = Data;
1809                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1810                                                                         Data);
1811                 if (status < 0) {
1812                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1813                         return -1;
1814                 }
1815 #endif
1816
1817         }
1818
1819         if (1) {                /* baudRate <= 115200) */
1820                 clk_sel_val = 0x0;
1821                 Data = 0x0;
1822                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1823                                                    &clk_sel_val);
1824                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1825                                                                  &Data);
1826                 if (status < 0) {
1827                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1828                         return -1;
1829                 }
1830                 Data = (Data & 0x8f) | clk_sel_val;
1831                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1832                                                                 Data);
1833                 if (status < 0) {
1834                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1835                         return -1;
1836                 }
1837                 /* Calculate the Divisor */
1838
1839                 if (status) {
1840                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1841                         return status;
1842                 }
1843                 /* Enable access to divisor latch */
1844                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1845                 mos7840_port->shadowLCR = Data;
1846                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1847
1848                 /* Write the divisor */
1849                 Data = (unsigned char)(divisor & 0xff);
1850                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1851                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1852
1853                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1854                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1855                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1856
1857                 /* Disable access to divisor latch */
1858                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1859                 mos7840_port->shadowLCR = Data;
1860                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1861
1862         }
1863         return status;
1864 }
1865
1866 /*****************************************************************************
1867  * mos7840_change_port_settings
1868  *      This routine is called to set the UART on the device to match
1869  *      the specified new settings.
1870  *****************************************************************************/
1871
1872 static void mos7840_change_port_settings(struct tty_struct *tty,
1873         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1874 {
1875         int baud;
1876         unsigned cflag;
1877         unsigned iflag;
1878         __u8 lData;
1879         __u8 lParity;
1880         __u8 lStop;
1881         int status;
1882         __u16 Data;
1883         struct usb_serial_port *port;
1884         struct usb_serial *serial;
1885
1886         if (mos7840_port == NULL)
1887                 return;
1888
1889         port = mos7840_port->port;
1890
1891         if (mos7840_port_paranoia_check(port, __func__))
1892                 return;
1893
1894         if (mos7840_serial_paranoia_check(port->serial, __func__))
1895                 return;
1896
1897         serial = port->serial;
1898
1899         if (!mos7840_port->open) {
1900                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1901                 return;
1902         }
1903
1904         lData = LCR_BITS_8;
1905         lStop = LCR_STOP_1;
1906         lParity = LCR_PAR_NONE;
1907
1908         cflag = tty->termios.c_cflag;
1909         iflag = tty->termios.c_iflag;
1910
1911         /* Change the number of bits */
1912         if (cflag & CSIZE) {
1913                 switch (cflag & CSIZE) {
1914                 case CS5:
1915                         lData = LCR_BITS_5;
1916                         break;
1917
1918                 case CS6:
1919                         lData = LCR_BITS_6;
1920                         break;
1921
1922                 case CS7:
1923                         lData = LCR_BITS_7;
1924                         break;
1925                 default:
1926                 case CS8:
1927                         lData = LCR_BITS_8;
1928                         break;
1929                 }
1930         }
1931         /* Change the Parity bit */
1932         if (cflag & PARENB) {
1933                 if (cflag & PARODD) {
1934                         lParity = LCR_PAR_ODD;
1935                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1936                 } else {
1937                         lParity = LCR_PAR_EVEN;
1938                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1939                 }
1940
1941         } else {
1942                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1943         }
1944
1945         if (cflag & CMSPAR)
1946                 lParity = lParity | 0x20;
1947
1948         /* Change the Stop bit */
1949         if (cflag & CSTOPB) {
1950                 lStop = LCR_STOP_2;
1951                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1952         } else {
1953                 lStop = LCR_STOP_1;
1954                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1955         }
1956
1957         /* Update the LCR with the correct value */
1958         mos7840_port->shadowLCR &=
1959             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1960         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1961
1962         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1963                 mos7840_port->shadowLCR);
1964         /* Disable Interrupts */
1965         Data = 0x00;
1966         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1967
1968         Data = 0x00;
1969         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1970
1971         Data = 0xcf;
1972         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1973
1974         /* Send the updated LCR value to the mos7840 */
1975         Data = mos7840_port->shadowLCR;
1976
1977         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1978
1979         Data = 0x00b;
1980         mos7840_port->shadowMCR = Data;
1981         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1982         Data = 0x00b;
1983         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1984
1985         /* set up the MCR register and send it to the mos7840 */
1986
1987         mos7840_port->shadowMCR = MCR_MASTER_IE;
1988         if (cflag & CBAUD)
1989                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1990
1991         if (cflag & CRTSCTS)
1992                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1993         else
1994                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1995
1996         Data = mos7840_port->shadowMCR;
1997         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1998
1999         /* Determine divisor based on baud rate */
2000         baud = tty_get_baud_rate(tty);
2001
2002         if (!baud) {
2003                 /* pick a default, any default... */
2004                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
2005                 baud = 9600;
2006         }
2007
2008         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
2009         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2010
2011         /* Enable Interrupts */
2012         Data = 0x0c;
2013         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2014
2015         if (mos7840_port->read_urb_busy == false) {
2016                 mos7840_port->read_urb_busy = true;
2017                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2018                 if (status) {
2019                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2020                             status);
2021                         mos7840_port->read_urb_busy = false;
2022                 }
2023         }
2024         wake_up(&mos7840_port->delta_msr_wait);
2025         mos7840_port->delta_msr_cond = 1;
2026         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
2027                 mos7840_port->shadowLCR);
2028 }
2029
2030 /*****************************************************************************
2031  * mos7840_set_termios
2032  *      this function is called by the tty driver when it wants to change
2033  *      the termios structure
2034  *****************************************************************************/
2035
2036 static void mos7840_set_termios(struct tty_struct *tty,
2037                                 struct usb_serial_port *port,
2038                                 struct ktermios *old_termios)
2039 {
2040         int status;
2041         unsigned int cflag;
2042         struct usb_serial *serial;
2043         struct moschip_port *mos7840_port;
2044
2045         if (mos7840_port_paranoia_check(port, __func__))
2046                 return;
2047
2048         serial = port->serial;
2049
2050         if (mos7840_serial_paranoia_check(serial, __func__))
2051                 return;
2052
2053         mos7840_port = mos7840_get_port_private(port);
2054
2055         if (mos7840_port == NULL)
2056                 return;
2057
2058         if (!mos7840_port->open) {
2059                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2060                 return;
2061         }
2062
2063         dev_dbg(&port->dev, "%s", "setting termios - \n");
2064
2065         cflag = tty->termios.c_cflag;
2066
2067         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2068                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2069         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2070                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2071         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
2072
2073         /* change the port settings to the new ones specified */
2074
2075         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2076
2077         if (!mos7840_port->read_urb) {
2078                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2079                 return;
2080         }
2081
2082         if (mos7840_port->read_urb_busy == false) {
2083                 mos7840_port->read_urb_busy = true;
2084                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2085                 if (status) {
2086                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2087                             status);
2088                         mos7840_port->read_urb_busy = false;
2089                 }
2090         }
2091 }
2092
2093 /*****************************************************************************
2094  * mos7840_get_lsr_info - get line status register info
2095  *
2096  * Purpose: Let user call ioctl() to get info when the UART physically
2097  *          is emptied.  On bus types like RS485, the transmitter must
2098  *          release the bus after transmitting. This must be done when
2099  *          the transmit shift register is empty, not be done when the
2100  *          transmit holding register is empty.  This functionality
2101  *          allows an RS485 driver to be written in user space.
2102  *****************************************************************************/
2103
2104 static int mos7840_get_lsr_info(struct tty_struct *tty,
2105                                 unsigned int __user *value)
2106 {
2107         int count;
2108         unsigned int result = 0;
2109
2110         count = mos7840_chars_in_buffer(tty);
2111         if (count == 0)
2112                 result = TIOCSER_TEMT;
2113
2114         if (copy_to_user(value, &result, sizeof(int)))
2115                 return -EFAULT;
2116         return 0;
2117 }
2118
2119 /*****************************************************************************
2120  * mos7840_get_serial_info
2121  *      function to get information about serial port
2122  *****************************************************************************/
2123
2124 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2125                                    struct serial_struct __user *retinfo)
2126 {
2127         struct serial_struct tmp;
2128
2129         if (mos7840_port == NULL)
2130                 return -1;
2131
2132         if (!retinfo)
2133                 return -EFAULT;
2134
2135         memset(&tmp, 0, sizeof(tmp));
2136
2137         tmp.type = PORT_16550A;
2138         tmp.line = mos7840_port->port->serial->minor;
2139         tmp.port = mos7840_port->port->number;
2140         tmp.irq = 0;
2141         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2142         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2143         tmp.baud_base = 9600;
2144         tmp.close_delay = 5 * HZ;
2145         tmp.closing_wait = 30 * HZ;
2146
2147         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2148                 return -EFAULT;
2149         return 0;
2150 }
2151
2152 static int mos7840_get_icount(struct tty_struct *tty,
2153                         struct serial_icounter_struct *icount)
2154 {
2155         struct usb_serial_port *port = tty->driver_data;
2156         struct moschip_port *mos7840_port;
2157         struct async_icount cnow;
2158
2159         mos7840_port = mos7840_get_port_private(port);
2160         cnow = mos7840_port->icount;
2161
2162         smp_rmb();
2163         icount->cts = cnow.cts;
2164         icount->dsr = cnow.dsr;
2165         icount->rng = cnow.rng;
2166         icount->dcd = cnow.dcd;
2167         icount->rx = cnow.rx;
2168         icount->tx = cnow.tx;
2169         icount->frame = cnow.frame;
2170         icount->overrun = cnow.overrun;
2171         icount->parity = cnow.parity;
2172         icount->brk = cnow.brk;
2173         icount->buf_overrun = cnow.buf_overrun;
2174
2175         dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
2176                 icount->rx, icount->tx);
2177         return 0;
2178 }
2179
2180 /*****************************************************************************
2181  * SerialIoctl
2182  *      this function handles any ioctl calls to the driver
2183  *****************************************************************************/
2184
2185 static int mos7840_ioctl(struct tty_struct *tty,
2186                          unsigned int cmd, unsigned long arg)
2187 {
2188         struct usb_serial_port *port = tty->driver_data;
2189         void __user *argp = (void __user *)arg;
2190         struct moschip_port *mos7840_port;
2191
2192         struct async_icount cnow;
2193         struct async_icount cprev;
2194
2195         if (mos7840_port_paranoia_check(port, __func__))
2196                 return -1;
2197
2198         mos7840_port = mos7840_get_port_private(port);
2199
2200         if (mos7840_port == NULL)
2201                 return -1;
2202
2203         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2204
2205         switch (cmd) {
2206                 /* return number of bytes available */
2207
2208         case TIOCSERGETLSR:
2209                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2210                 return mos7840_get_lsr_info(tty, argp);
2211
2212         case TIOCGSERIAL:
2213                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2214                 return mos7840_get_serial_info(mos7840_port, argp);
2215
2216         case TIOCSSERIAL:
2217                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2218                 break;
2219
2220         case TIOCMIWAIT:
2221                 dev_dbg(&port->dev, "%s  TIOCMIWAIT\n", __func__);
2222                 cprev = mos7840_port->icount;
2223                 while (1) {
2224                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2225                         mos7840_port->delta_msr_cond = 0;
2226                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2227                                                  (mos7840_port->
2228                                                   delta_msr_cond == 1));
2229
2230                         /* see if a signal did it */
2231                         if (signal_pending(current))
2232                                 return -ERESTARTSYS;
2233                         cnow = mos7840_port->icount;
2234                         smp_rmb();
2235                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2236                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2237                                 return -EIO;    /* no change => error */
2238                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2239                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2240                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2241                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2242                                 return 0;
2243                         }
2244                         cprev = cnow;
2245                 }
2246                 /* NOTREACHED */
2247                 break;
2248
2249         default:
2250                 break;
2251         }
2252         return -ENOIOCTLCMD;
2253 }
2254
2255 static int mos7810_check(struct usb_serial *serial)
2256 {
2257         int i, pass_count = 0;
2258         __u16 data = 0, mcr_data = 0;
2259         __u16 test_pattern = 0x55AA;
2260
2261         /* Store MCR setting */
2262         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2263                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2264                 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2265
2266         for (i = 0; i < 16; i++) {
2267                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2268                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2269                         MCS_WRREQ, MCS_WR_RTYPE,
2270                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2271                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2272
2273                 /* Read the test pattern back */
2274                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2275                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2276                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2277
2278                 /* If this is a MCS7810 device, both test patterns must match */
2279                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2280                         break;
2281
2282                 pass_count++;
2283         }
2284
2285         /* Restore MCR setting */
2286         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2287                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2288                 0, MOS_WDR_TIMEOUT);
2289
2290         if (pass_count == 16)
2291                 return 1;
2292
2293         return 0;
2294 }
2295
2296 static int mos7840_calc_num_ports(struct usb_serial *serial)
2297 {
2298         __u16 data = 0x00;
2299         int mos7840_num_ports;
2300
2301         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2302                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2303                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2304
2305         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2306                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2307                 device_type = serial->dev->descriptor.idProduct;
2308         } else {
2309                 /* For a MCS7840 device GPIO0 must be set to 1 */
2310                 if ((data & 0x01) == 1)
2311                         device_type = MOSCHIP_DEVICE_ID_7840;
2312                 else if (mos7810_check(serial))
2313                         device_type = MOSCHIP_DEVICE_ID_7810;
2314                 else
2315                         device_type = MOSCHIP_DEVICE_ID_7820;
2316         }
2317
2318         mos7840_num_ports = (device_type >> 4) & 0x000F;
2319         serial->num_bulk_in = mos7840_num_ports;
2320         serial->num_bulk_out = mos7840_num_ports;
2321         serial->num_ports = mos7840_num_ports;
2322
2323         return mos7840_num_ports;
2324 }
2325
2326 static int mos7840_port_probe(struct usb_serial_port *port)
2327 {
2328         struct usb_serial *serial = port->serial;
2329         struct moschip_port *mos7840_port;
2330         int status;
2331         int pnum;
2332         __u16 Data;
2333
2334         /* we set up the pointers to the endpoints in the mos7840_open *
2335          * function, as the structures aren't created yet.             */
2336
2337         pnum = port->number - serial->minor;
2338
2339         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2340         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2341         if (mos7840_port == NULL) {
2342                 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2343                 return -ENOMEM;
2344         }
2345
2346         /* Initialize all port interrupt end point to port 0 int
2347          * endpoint. Our device has only one interrupt end point
2348          * common to all port */
2349
2350         mos7840_port->port = port;
2351         mos7840_set_port_private(port, mos7840_port);
2352         spin_lock_init(&mos7840_port->pool_lock);
2353
2354         /* minor is not initialised until later by
2355          * usb-serial.c:get_free_serial() and cannot therefore be used
2356          * to index device instances */
2357         mos7840_port->port_num = pnum + 1;
2358         dev_dbg(&port->dev, "port->number = %d\n", port->number);
2359         dev_dbg(&port->dev, "port->serial->minor = %d\n", port->serial->minor);
2360         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2361         dev_dbg(&port->dev, "serial->minor = %d\n", serial->minor);
2362
2363         if (mos7840_port->port_num == 1) {
2364                 mos7840_port->SpRegOffset = 0x0;
2365                 mos7840_port->ControlRegOffset = 0x1;
2366                 mos7840_port->DcrRegOffset = 0x4;
2367         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2368                 mos7840_port->SpRegOffset = 0x8;
2369                 mos7840_port->ControlRegOffset = 0x9;
2370                 mos7840_port->DcrRegOffset = 0x16;
2371         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2372                 mos7840_port->SpRegOffset = 0xa;
2373                 mos7840_port->ControlRegOffset = 0xb;
2374                 mos7840_port->DcrRegOffset = 0x19;
2375         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2376                 mos7840_port->SpRegOffset = 0xa;
2377                 mos7840_port->ControlRegOffset = 0xb;
2378                 mos7840_port->DcrRegOffset = 0x19;
2379         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2380                 mos7840_port->SpRegOffset = 0xc;
2381                 mos7840_port->ControlRegOffset = 0xd;
2382                 mos7840_port->DcrRegOffset = 0x1c;
2383         }
2384         mos7840_dump_serial_port(port, mos7840_port);
2385         mos7840_set_port_private(port, mos7840_port);
2386
2387         /* enable rx_disable bit in control register */
2388         status = mos7840_get_reg_sync(port,
2389                         mos7840_port->ControlRegOffset, &Data);
2390         if (status < 0) {
2391                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2392                 goto out;
2393         } else
2394                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2395         Data |= 0x08;   /* setting driver done bit */
2396         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2397                            modem status reg */
2398
2399         /* Data |= 0x20; //rx_disable bit */
2400         status = mos7840_set_reg_sync(port,
2401                         mos7840_port->ControlRegOffset, Data);
2402         if (status < 0) {
2403                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2404                 goto out;
2405         } else
2406                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2407
2408         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2409            and 0x24 in DCR3 */
2410         Data = 0x01;
2411         status = mos7840_set_reg_sync(port,
2412                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2413         if (status < 0) {
2414                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2415                 goto out;
2416         } else
2417                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2418
2419         Data = 0x05;
2420         status = mos7840_set_reg_sync(port,
2421                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2422         if (status < 0) {
2423                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2424                 goto out;
2425         } else
2426                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2427
2428         Data = 0x24;
2429         status = mos7840_set_reg_sync(port,
2430                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2431         if (status < 0) {
2432                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2433                 goto out;
2434         } else
2435                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2436
2437         /* write values in clkstart0x0 and clkmulti 0x20 */
2438         Data = 0x0;
2439         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2440         if (status < 0) {
2441                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2442                 goto out;
2443         } else
2444                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2445
2446         Data = 0x20;
2447         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2448         if (status < 0) {
2449                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2450                 goto error;
2451         } else
2452                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2453
2454         /* write value 0x0 to scratchpad register */
2455         Data = 0x00;
2456         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2457         if (status < 0) {
2458                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2459                 goto out;
2460         } else
2461                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2462
2463         /* Zero Length flag register */
2464         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2465                 Data = 0xff;
2466                 status = mos7840_set_reg_sync(port,
2467                                 (__u16) (ZLP_REG1 +
2468                                         ((__u16)mos7840_port->port_num)), Data);
2469                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2470                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2471                 if (status < 0) {
2472                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2473                         goto out;
2474                 } else
2475                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2476         } else {
2477                 Data = 0xff;
2478                 status = mos7840_set_reg_sync(port,
2479                                 (__u16) (ZLP_REG1 +
2480                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2481                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2482                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2483                 if (status < 0) {
2484                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2485                         goto out;
2486                 } else
2487                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2488
2489         }
2490         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2491         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2492         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2493                         GFP_KERNEL);
2494         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2495                         !mos7840_port->dr) {
2496                 status = -ENOMEM;
2497                 goto error;
2498         }
2499
2500         mos7840_port->has_led = false;
2501
2502         /* Initialize LED timers */
2503         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2504                 mos7840_port->has_led = true;
2505
2506                 init_timer(&mos7840_port->led_timer1);
2507                 mos7840_port->led_timer1.function = mos7840_led_off;
2508                 mos7840_port->led_timer1.expires =
2509                         jiffies + msecs_to_jiffies(LED_ON_MS);
2510                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2511
2512                 init_timer(&mos7840_port->led_timer2);
2513                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2514                 mos7840_port->led_timer2.expires =
2515                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2516                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2517
2518                 mos7840_port->led_flag = false;
2519
2520                 /* Turn off LED */
2521                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2522         }
2523 out:
2524         if (pnum == serial->num_ports - 1) {
2525                 /* Zero Length flag enable */
2526                 Data = 0x0f;
2527                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2528                 if (status < 0) {
2529                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2530                         goto error;
2531                 } else
2532                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2533
2534                 /* setting configuration feature to one */
2535                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2536                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2537                                 MOS_WDR_TIMEOUT);
2538         }
2539         return 0;
2540 error:
2541         kfree(mos7840_port->dr);
2542         kfree(mos7840_port->ctrl_buf);
2543         usb_free_urb(mos7840_port->control_urb);
2544         kfree(mos7840_port);
2545
2546         return status;
2547 }
2548
2549 static int mos7840_port_remove(struct usb_serial_port *port)
2550 {
2551         struct moschip_port *mos7840_port;
2552
2553         mos7840_port = mos7840_get_port_private(port);
2554
2555         if (mos7840_port->has_led) {
2556                 /* Turn off LED */
2557                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2558
2559                 del_timer_sync(&mos7840_port->led_timer1);
2560                 del_timer_sync(&mos7840_port->led_timer2);
2561         }
2562         usb_kill_urb(mos7840_port->control_urb);
2563         usb_free_urb(mos7840_port->control_urb);
2564         kfree(mos7840_port->ctrl_buf);
2565         kfree(mos7840_port->dr);
2566         kfree(mos7840_port);
2567
2568         return 0;
2569 }
2570
2571 static struct usb_serial_driver moschip7840_4port_device = {
2572         .driver = {
2573                    .owner = THIS_MODULE,
2574                    .name = "mos7840",
2575                    },
2576         .description = DRIVER_DESC,
2577         .id_table = id_table,
2578         .num_ports = 4,
2579         .open = mos7840_open,
2580         .close = mos7840_close,
2581         .write = mos7840_write,
2582         .write_room = mos7840_write_room,
2583         .chars_in_buffer = mos7840_chars_in_buffer,
2584         .throttle = mos7840_throttle,
2585         .unthrottle = mos7840_unthrottle,
2586         .calc_num_ports = mos7840_calc_num_ports,
2587 #ifdef MCSSerialProbe
2588         .probe = mos7840_serial_probe,
2589 #endif
2590         .ioctl = mos7840_ioctl,
2591         .set_termios = mos7840_set_termios,
2592         .break_ctl = mos7840_break,
2593         .tiocmget = mos7840_tiocmget,
2594         .tiocmset = mos7840_tiocmset,
2595         .get_icount = mos7840_get_icount,
2596         .port_probe = mos7840_port_probe,
2597         .port_remove = mos7840_port_remove,
2598         .read_bulk_callback = mos7840_bulk_in_callback,
2599         .read_int_callback = mos7840_interrupt_callback,
2600 };
2601
2602 static struct usb_serial_driver * const serial_drivers[] = {
2603         &moschip7840_4port_device, NULL
2604 };
2605
2606 module_usb_serial_driver(serial_drivers, id_table);
2607
2608 MODULE_DESCRIPTION(DRIVER_DESC);
2609 MODULE_LICENSE("GPL");