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