drivers/usb/serial/mos7840.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Clean ups from Moschip version and a few ioctl implementations by:
   4  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
   5  *
   6  * Originally based on drivers/usb/serial/io_edgeport.c which is:
   7  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
   8  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
   9  *
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/errno.h>
  14 #include <linux/slab.h>
  15 #include <linux/tty.h>
  16 #include <linux/tty_driver.h>
  17 #include <linux/tty_flip.h>
  18 #include <linux/module.h>
  19 #include <linux/serial.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/serial.h>
  22 #include <linux/uaccess.h>
  23
  24 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  25
  26 /*
  27  * 16C50 UART register defines
  28  */
  29
  30 #define LCR_BITS_5             0x00     /* 5 bits/char */
  31 #define LCR_BITS_6             0x01     /* 6 bits/char */
  32 #define LCR_BITS_7             0x02     /* 7 bits/char */
  33 #define LCR_BITS_8             0x03     /* 8 bits/char */
  34 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  35
  36 #define LCR_STOP_1             0x00     /* 1 stop bit */
  37 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  38 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  39 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  40
  41 #define LCR_PAR_NONE           0x00     /* No parity */
  42 #define LCR_PAR_ODD            0x08     /* Odd parity */
  43 #define LCR_PAR_EVEN           0x18     /* Even parity */
  44 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  45 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  46 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  47
  48 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  49 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  50
  51 #define MCR_DTR                0x01     /* Assert DTR */
  52 #define MCR_RTS                0x02     /* Assert RTS */
  53 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  54 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  55 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  56 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  57
  58 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  59 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  60 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  61 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  62
  63 /*
  64  * Defines used for sending commands to port
  65  */
  66
  67 #define MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  68
  69 #define MOS_PORT1       0x0200
  70 #define MOS_PORT2       0x0300
  71 #define MOS_VENREG      0x0000
  72 #define MOS_MAX_PORT    0x02
  73 #define MOS_WRITE       0x0E
  74 #define MOS_READ        0x0D
  75
  76 /* Requests */
  77 #define MCS_RD_RTYPE    0xC0
  78 #define MCS_WR_RTYPE    0x40
  79 #define MCS_RDREQ       0x0D
  80 #define MCS_WRREQ       0x0E
  81 #define MCS_CTRL_TIMEOUT        500
  82 #define VENDOR_READ_LENGTH      (0x01)
  83
  84 #define MAX_NAME_LEN    64
  85
  86 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
  87 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
  88
  89 /* For higher baud Rates use TIOCEXBAUD */
  90 #define TIOCEXBAUD     0x5462
  91
  92 /*
  93  * Vendor id and device id defines
  94  *
  95  * NOTE: Do not add new defines, add entries directly to the id_table instead.
  96  */
  97 #define USB_VENDOR_ID_BANDB              0x0856
  98 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
  99 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 100 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 101 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 102 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 103 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 104 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 105 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 106 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 107 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 108 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 109 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 110 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 111
 112 /* Interrupt Routine Defines    */
 113
 114 #define SERIAL_IIR_RLS      0x06
 115 #define SERIAL_IIR_MS       0x00
 116
 117 /*
 118  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 119  */
 120 #define SERIAL_LSR_DR       0x0001
 121 #define SERIAL_LSR_OE       0x0002
 122 #define SERIAL_LSR_PE       0x0004
 123 #define SERIAL_LSR_FE       0x0008
 124 #define SERIAL_LSR_BI       0x0010
 125
 126 #define MOS_MSR_DELTA_CTS   0x10
 127 #define MOS_MSR_DELTA_DSR   0x20
 128 #define MOS_MSR_DELTA_RI    0x40
 129 #define MOS_MSR_DELTA_CD    0x80
 130
 131 /* Serial Port register Address */
 132 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 133 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 134 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 135 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 136 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 137 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 138 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 139 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 140 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 141
 142 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 143 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 144 #define GPIO_REGISTER              ((__u16)(0x07))
 145
 146 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 147
 148 /*
 149  * URB POOL related defines
 150  */
 151 #define NUM_URBS                        16      /* URB Count */
 152 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 153
 154 /* LED on/off milliseconds*/
 155 #define LED_ON_MS       500
 156 #define LED_OFF_MS      500
 157
 158 enum mos7840_flag {
 159         MOS7840_FLAG_LED_BUSY,
 160 };
 161
 162 #define MCS_PORT_MASK   GENMASK(2, 0)
 163 #define MCS_PORTS(nr)   ((nr) & MCS_PORT_MASK)
 164 #define MCS_LED         BIT(3)
 165
 166 #define MCS_DEVICE(vid, pid, flags) \
 167                 USB_DEVICE((vid), (pid)), .driver_info = (flags)
 168
 169 static const struct usb_device_id id_table[] = {
 170         { MCS_DEVICE(0x0557, 0x2011, MCS_PORTS(4)) },   /* ATEN UC2324 */
 171         { MCS_DEVICE(0x0557, 0x7820, MCS_PORTS(2)) },   /* ATEN UC2322 */
 172         { MCS_DEVICE(0x110a, 0x2210, MCS_PORTS(2)) },   /* Moxa UPort 2210 */
 173         { MCS_DEVICE(0x9710, 0x7810, MCS_PORTS(1) | MCS_LED) }, /* ASIX MCS7810 */
 174         { MCS_DEVICE(0x9710, 0x7820, MCS_PORTS(2)) },   /* MosChip MCS7820 */
 175         { MCS_DEVICE(0x9710, 0x7840, MCS_PORTS(4)) },   /* MosChip MCS7840 */
 176         { MCS_DEVICE(0x9710, 0x7843, MCS_PORTS(3)) },   /* ASIX MCS7840 3 port */
 177         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2) },
 178         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P) },
 179         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4) },
 180         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P) },
 181         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2) },
 182         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4) },
 183         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2) },
 184         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4) },
 185         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2) },
 186         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P) },
 187         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4) },
 188         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P) },
 189         { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4) },
 190         {}                      /* terminating entry */
 191 };
 192 MODULE_DEVICE_TABLE(usb, id_table);
 193
 194 /* This structure holds all of the local port information */
 195
 196 struct moschip_port {
 197         int port_num;           /*Actual port number in the device(1,2,etc) */
 198         struct urb *read_urb;   /* read URB for this port */
 199         __u8 shadowLCR;         /* last LCR value received */
 200         __u8 shadowMCR;         /* last MCR value received */
 201         struct usb_serial_port *port;   /* loop back to the owner of this object */
 202
 203         /* Offsets */
 204         __u8 SpRegOffset;
 205         __u8 ControlRegOffset;
 206         __u8 DcrRegOffset;
 207
 208         spinlock_t pool_lock;
 209         struct urb *write_urb_pool[NUM_URBS];
 210         char busy[NUM_URBS];
 211         bool read_urb_busy;
 212
 213         /* For device(s) with LED indicator */
 214         bool has_led;
 215         struct timer_list led_timer1;   /* Timer for LED on */
 216         struct timer_list led_timer2;   /* Timer for LED off */
 217         struct urb *led_urb;
 218         struct usb_ctrlrequest *led_dr;
 219
 220         unsigned long flags;
 221 };
 222
 223 /*
 224  * mos7840_set_reg_sync
 225  *      To set the Control register by calling usb_fill_control_urb function
 226  *      by passing usb_sndctrlpipe function as parameter.
 227  */
 228
 229 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 230                                 __u16 val)
 231 {
 232         struct usb_device *dev = port->serial->dev;
 233         val = val & 0x00ff;
 234         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 235
 236         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 237                                MCS_WR_RTYPE, val, reg, NULL, 0,
 238                                MOS_WDR_TIMEOUT);
 239 }
 240
 241 /*
 242  * mos7840_get_reg_sync
 243  *      To set the Uart register by calling usb_fill_control_urb function by
 244  *      passing usb_rcvctrlpipe function as parameter.
 245  */
 246
 247 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 248                                 __u16 *val)
 249 {
 250         struct usb_device *dev = port->serial->dev;
 251         int ret = 0;
 252         u8 *buf;
 253
 254         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 255         if (!buf)
 256                 return -ENOMEM;
 257
 258         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 259                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 260                               MOS_WDR_TIMEOUT);
 261         if (ret < VENDOR_READ_LENGTH) {
 262                 if (ret >= 0)
 263                         ret = -EIO;
 264                 goto out;
 265         }
 266
 267         *val = buf[0];
 268         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 269 out:
 270         kfree(buf);
 271         return ret;
 272 }
 273
 274 /*
 275  * mos7840_set_uart_reg
 276  *      To set the Uart register by calling usb_fill_control_urb function by
 277  *      passing usb_sndctrlpipe function as parameter.
 278  */
 279
 280 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 281                                 __u16 val)
 282 {
 283
 284         struct usb_device *dev = port->serial->dev;
 285         val = val & 0x00ff;
 286         /* For the UART control registers, the application number need
 287            to be Or'ed */
 288         if (port->serial->num_ports == 2 && port->port_number != 0)
 289                 val |= ((__u16)port->port_number + 2) << 8;
 290         else
 291                 val |= ((__u16)port->port_number + 1) << 8;
 292         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 293         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 294                                MCS_WR_RTYPE, val, reg, NULL, 0,
 295                                MOS_WDR_TIMEOUT);
 296
 297 }
 298
 299 /*
 300  * mos7840_get_uart_reg
 301  *      To set the Control register by calling usb_fill_control_urb function
 302  *      by passing usb_rcvctrlpipe function as parameter.
 303  */
 304 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 305                                 __u16 *val)
 306 {
 307         struct usb_device *dev = port->serial->dev;
 308         int ret = 0;
 309         __u16 Wval;
 310         u8 *buf;
 311
 312         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 313         if (!buf)
 314                 return -ENOMEM;
 315
 316         /* Wval  is same as application number */
 317         if (port->serial->num_ports == 2 && port->port_number != 0)
 318                 Wval = ((__u16)port->port_number + 2) << 8;
 319         else
 320                 Wval = ((__u16)port->port_number + 1) << 8;
 321         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 322         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 323                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 324                               MOS_WDR_TIMEOUT);
 325         if (ret < VENDOR_READ_LENGTH) {
 326                 if (ret >= 0)
 327                         ret = -EIO;
 328                 goto out;
 329         }
 330         *val = buf[0];
 331 out:
 332         kfree(buf);
 333         return ret;
 334 }
 335
 336 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 337                                      struct moschip_port *mos7840_port)
 338 {
 339
 340         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 341         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 342         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 343
 344 }
 345
 346 /************************************************************************/
 347 /************************************************************************/
 348 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 349 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 350 /************************************************************************/
 351 /************************************************************************/
 352
 353 static void mos7840_set_led_callback(struct urb *urb)
 354 {
 355         switch (urb->status) {
 356         case 0:
 357                 /* Success */
 358                 break;
 359         case -ECONNRESET:
 360         case -ENOENT:
 361         case -ESHUTDOWN:
 362                 /* This urb is terminated, clean up */
 363                 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
 364                         __func__, urb->status);
 365                 break;
 366         default:
 367                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
 368                         __func__, urb->status);
 369         }
 370 }
 371
 372 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 373                                 __u16 reg)
 374 {
 375         struct usb_device *dev = mcs->port->serial->dev;
 376         struct usb_ctrlrequest *dr = mcs->led_dr;
 377
 378         dr->bRequestType = MCS_WR_RTYPE;
 379         dr->bRequest = MCS_WRREQ;
 380         dr->wValue = cpu_to_le16(wval);
 381         dr->wIndex = cpu_to_le16(reg);
 382         dr->wLength = cpu_to_le16(0);
 383
 384         usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
 385                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 386
 387         usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
 388 }
 389
 390 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 391                                 __u16 val)
 392 {
 393         struct usb_device *dev = port->serial->dev;
 394
 395         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 396                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 397 }
 398
 399 static void mos7840_led_off(struct timer_list *t)
 400 {
 401         struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
 402
 403         /* Turn off LED */
 404         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 405         mod_timer(&mcs->led_timer2,
 406                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 407 }
 408
 409 static void mos7840_led_flag_off(struct timer_list *t)
 410 {
 411         struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
 412
 413         clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
 414 }
 415
 416 static void mos7840_led_activity(struct usb_serial_port *port)
 417 {
 418         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 419
 420         if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
 421                 return;
 422
 423         mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
 424         mod_timer(&mos7840_port->led_timer1,
 425                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 426 }
 427
 428 /*****************************************************************************
 429  * mos7840_bulk_in_callback
 430  *      this is the callback function for when we have received data on the
 431  *      bulk in endpoint.
 432  *****************************************************************************/
 433
 434 static void mos7840_bulk_in_callback(struct urb *urb)
 435 {
 436         struct moschip_port *mos7840_port = urb->context;
 437         struct usb_serial_port *port = mos7840_port->port;
 438         int retval;
 439         unsigned char *data;
 440         int status = urb->status;
 441
 442         if (status) {
 443                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 444                 mos7840_port->read_urb_busy = false;
 445                 return;
 446         }
 447
 448         data = urb->transfer_buffer;
 449         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 450
 451         if (urb->actual_length) {
 452                 struct tty_port *tport = &mos7840_port->port->port;
 453                 tty_insert_flip_string(tport, data, urb->actual_length);
 454                 tty_flip_buffer_push(tport);
 455                 port->icount.rx += urb->actual_length;
 456                 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
 457         }
 458
 459         if (mos7840_port->has_led)
 460                 mos7840_led_activity(port);
 461
 462         mos7840_port->read_urb_busy = true;
 463         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 464
 465         if (retval) {
 466                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 467                 mos7840_port->read_urb_busy = false;
 468         }
 469 }
 470
 471 /*****************************************************************************
 472  * mos7840_bulk_out_data_callback
 473  *      this is the callback function for when we have finished sending
 474  *      serial data on the bulk out endpoint.
 475  *****************************************************************************/
 476
 477 static void mos7840_bulk_out_data_callback(struct urb *urb)
 478 {
 479         struct moschip_port *mos7840_port = urb->context;
 480         struct usb_serial_port *port = mos7840_port->port;
 481         int status = urb->status;
 482         unsigned long flags;
 483         int i;
 484
 485         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
 486         for (i = 0; i < NUM_URBS; i++) {
 487                 if (urb == mos7840_port->write_urb_pool[i]) {
 488                         mos7840_port->busy[i] = 0;
 489                         break;
 490                 }
 491         }
 492         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
 493
 494         if (status) {
 495                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 496                 return;
 497         }
 498
 499         tty_port_tty_wakeup(&port->port);
 500
 501 }
 502
 503 /************************************************************************/
 504 /*       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       */
 505 /************************************************************************/
 506
 507 /*****************************************************************************
 508  * mos7840_open
 509  *      this function is called by the tty driver when a port is opened
 510  *      If successful, we return 0
 511  *      Otherwise we return a negative error number.
 512  *****************************************************************************/
 513
 514 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 515 {
 516         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 517         struct usb_serial *serial = port->serial;
 518         int response;
 519         int j;
 520         struct urb *urb;
 521         __u16 Data;
 522         int status;
 523
 524         usb_clear_halt(serial->dev, port->write_urb->pipe);
 525         usb_clear_halt(serial->dev, port->read_urb->pipe);
 526
 527         /* Initialising the write urb pool */
 528         for (j = 0; j < NUM_URBS; ++j) {
 529                 urb = usb_alloc_urb(0, GFP_KERNEL);
 530                 mos7840_port->write_urb_pool[j] = urb;
 531                 if (!urb)
 532                         continue;
 533
 534                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 535                                                                 GFP_KERNEL);
 536                 if (!urb->transfer_buffer) {
 537                         usb_free_urb(urb);
 538                         mos7840_port->write_urb_pool[j] = NULL;
 539                         continue;
 540                 }
 541         }
 542
 543 /*****************************************************************************
 544  * Initialize MCS7840 -- Write Init values to corresponding Registers
 545  *
 546  * Register Index
 547  * 1 : IER
 548  * 2 : FCR
 549  * 3 : LCR
 550  * 4 : MCR
 551  *
 552  * 0x08 : SP1/2 Control Reg
 553  *****************************************************************************/
 554
 555         /* NEED to check the following Block */
 556
 557         Data = 0x0;
 558         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 559         if (status < 0) {
 560                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 561                 goto err;
 562         }
 563         Data |= 0x80;
 564         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 565         if (status < 0) {
 566                 dev_dbg(&port->dev, "writing Spreg failed\n");
 567                 goto err;
 568         }
 569
 570         Data &= ~0x80;
 571         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 572         if (status < 0) {
 573                 dev_dbg(&port->dev, "writing Spreg failed\n");
 574                 goto err;
 575         }
 576         /* End of block to be checked */
 577
 578         Data = 0x0;
 579         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 580                                                                         &Data);
 581         if (status < 0) {
 582                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 583                 goto err;
 584         }
 585         Data |= 0x08;           /* Driver done bit */
 586         Data |= 0x20;           /* rx_disable */
 587         status = mos7840_set_reg_sync(port,
 588                                 mos7840_port->ControlRegOffset, Data);
 589         if (status < 0) {
 590                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 591                 goto err;
 592         }
 593         /* do register settings here */
 594         /* Set all regs to the device default values. */
 595         /***********************************
 596          * First Disable all interrupts.
 597          ***********************************/
 598         Data = 0x00;
 599         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 600         if (status < 0) {
 601                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 602                 goto err;
 603         }
 604         /* Set FIFO_CONTROL_REGISTER to the default value */
 605         Data = 0x00;
 606         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 607         if (status < 0) {
 608                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 609                 goto err;
 610         }
 611
 612         Data = 0xcf;
 613         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 614         if (status < 0) {
 615                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 616                 goto err;
 617         }
 618
 619         Data = 0x03;
 620         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 621         mos7840_port->shadowLCR = Data;
 622
 623         Data = 0x0b;
 624         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 625         mos7840_port->shadowMCR = Data;
 626
 627         Data = 0x00;
 628         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 629         mos7840_port->shadowLCR = Data;
 630
 631         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 632         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 633
 634         Data = 0x0c;
 635         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 636
 637         Data = 0x0;
 638         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 639
 640         Data = 0x00;
 641         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 642
 643         Data = Data & ~SERIAL_LCR_DLAB;
 644         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 645         mos7840_port->shadowLCR = Data;
 646
 647         /* clearing Bulkin and Bulkout Fifo */
 648         Data = 0x0;
 649         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 650
 651         Data = Data | 0x0c;
 652         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 653
 654         Data = Data & ~0x0c;
 655         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 656         /* Finally enable all interrupts */
 657         Data = 0x0c;
 658         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 659
 660         /* clearing rx_disable */
 661         Data = 0x0;
 662         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 663                                                                         &Data);
 664         Data = Data & ~0x20;
 665         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
 666                                                                         Data);
 667
 668         /* rx_negate */
 669         Data = 0x0;
 670         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 671                                                                         &Data);
 672         Data = Data | 0x10;
 673         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
 674                                                                         Data);
 675
 676         dev_dbg(&port->dev, "port number is %d\n", port->port_number);
 677         dev_dbg(&port->dev, "minor number is %d\n", port->minor);
 678         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
 679         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
 680         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
 681         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
 682         mos7840_port->read_urb = port->read_urb;
 683
 684         /* set up our bulk in urb */
 685         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
 686                 usb_fill_bulk_urb(mos7840_port->read_urb,
 687                         serial->dev,
 688                         usb_rcvbulkpipe(serial->dev,
 689                                 (port->bulk_in_endpointAddress) + 2),
 690                         port->bulk_in_buffer,
 691                         mos7840_port->read_urb->transfer_buffer_length,
 692                         mos7840_bulk_in_callback, mos7840_port);
 693         } else {
 694                 usb_fill_bulk_urb(mos7840_port->read_urb,
 695                         serial->dev,
 696                         usb_rcvbulkpipe(serial->dev,
 697                                 port->bulk_in_endpointAddress),
 698                         port->bulk_in_buffer,
 699                         mos7840_port->read_urb->transfer_buffer_length,
 700                         mos7840_bulk_in_callback, mos7840_port);
 701         }
 702
 703         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
 704         mos7840_port->read_urb_busy = true;
 705         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
 706         if (response) {
 707                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
 708                         __func__, response);
 709                 mos7840_port->read_urb_busy = false;
 710         }
 711
 712         /* initialize our port settings */
 713         /* Must set to enable ints! */
 714         mos7840_port->shadowMCR = MCR_MASTER_IE;
 715
 716         return 0;
 717 err:
 718         for (j = 0; j < NUM_URBS; ++j) {
 719                 urb = mos7840_port->write_urb_pool[j];
 720                 if (!urb)
 721                         continue;
 722                 kfree(urb->transfer_buffer);
 723                 usb_free_urb(urb);
 724         }
 725         return status;
 726 }
 727
 728 /*****************************************************************************
 729  * mos7840_chars_in_buffer
 730  *      this function is called by the tty driver when it wants to know how many
 731  *      bytes of data we currently have outstanding in the port (data that has
 732  *      been written, but hasn't made it out the port yet)
 733  *      If successful, we return the number of bytes left to be written in the
 734  *      system,
 735  *      Otherwise we return zero.
 736  *****************************************************************************/
 737
 738 static int mos7840_chars_in_buffer(struct tty_struct *tty)
 739 {
 740         struct usb_serial_port *port = tty->driver_data;
 741         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 742         int i;
 743         int chars = 0;
 744         unsigned long flags;
 745
 746         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
 747         for (i = 0; i < NUM_URBS; ++i) {
 748                 if (mos7840_port->busy[i]) {
 749                         struct urb *urb = mos7840_port->write_urb_pool[i];
 750                         chars += urb->transfer_buffer_length;
 751                 }
 752         }
 753         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
 754         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
 755         return chars;
 756
 757 }
 758
 759 /*****************************************************************************
 760  * mos7840_close
 761  *      this function is called by the tty driver when a port is closed
 762  *****************************************************************************/
 763
 764 static void mos7840_close(struct usb_serial_port *port)
 765 {
 766         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 767         int j;
 768         __u16 Data;
 769
 770         for (j = 0; j < NUM_URBS; ++j)
 771                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
 772
 773         /* Freeing Write URBs */
 774         for (j = 0; j < NUM_URBS; ++j) {
 775                 if (mos7840_port->write_urb_pool[j]) {
 776                         kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
 777                         usb_free_urb(mos7840_port->write_urb_pool[j]);
 778                 }
 779         }
 780
 781         usb_kill_urb(mos7840_port->read_urb);
 782         mos7840_port->read_urb_busy = false;
 783
 784         Data = 0x0;
 785         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 786
 787         Data = 0x00;
 788         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 789 }
 790
 791 /*****************************************************************************
 792  * mos7840_break
 793  *      this function sends a break to the port
 794  *****************************************************************************/
 795 static void mos7840_break(struct tty_struct *tty, int break_state)
 796 {
 797         struct usb_serial_port *port = tty->driver_data;
 798         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 799         unsigned char data;
 800
 801         if (break_state == -1)
 802                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
 803         else
 804                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
 805
 806         /* FIXME: no locking on shadowLCR anywhere in driver */
 807         mos7840_port->shadowLCR = data;
 808         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
 809         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
 810                              mos7840_port->shadowLCR);
 811 }
 812
 813 /*****************************************************************************
 814  * mos7840_write_room
 815  *      this function is called by the tty driver when it wants to know how many
 816  *      bytes of data we can accept for a specific port.
 817  *      If successful, we return the amount of room that we have for this port
 818  *      Otherwise we return a negative error number.
 819  *****************************************************************************/
 820
 821 static int mos7840_write_room(struct tty_struct *tty)
 822 {
 823         struct usb_serial_port *port = tty->driver_data;
 824         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 825         int i;
 826         int room = 0;
 827         unsigned long flags;
 828
 829         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
 830         for (i = 0; i < NUM_URBS; ++i) {
 831                 if (!mos7840_port->busy[i])
 832                         room += URB_TRANSFER_BUFFER_SIZE;
 833         }
 834         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
 835
 836         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
 837         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
 838         return room;
 839
 840 }
 841
 842 /*****************************************************************************
 843  * mos7840_write
 844  *      this function is called by the tty driver when data should be written to
 845  *      the port.
 846  *      If successful, we return the number of bytes written, otherwise we
 847  *      return a negative error number.
 848  *****************************************************************************/
 849
 850 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
 851                          const unsigned char *data, int count)
 852 {
 853         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 854         struct usb_serial *serial = port->serial;
 855         int status;
 856         int i;
 857         int bytes_sent = 0;
 858         int transfer_size;
 859         unsigned long flags;
 860         struct urb *urb;
 861         /* __u16 Data; */
 862         const unsigned char *current_position = data;
 863
 864         /* try to find a free urb in the list */
 865         urb = NULL;
 866
 867         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
 868         for (i = 0; i < NUM_URBS; ++i) {
 869                 if (!mos7840_port->busy[i]) {
 870                         mos7840_port->busy[i] = 1;
 871                         urb = mos7840_port->write_urb_pool[i];
 872                         dev_dbg(&port->dev, "URB:%d\n", i);
 873                         break;
 874                 }
 875         }
 876         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
 877
 878         if (urb == NULL) {
 879                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
 880                 goto exit;
 881         }
 882
 883         if (urb->transfer_buffer == NULL) {
 884                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 885                                                GFP_ATOMIC);
 886                 if (!urb->transfer_buffer)
 887                         goto exit;
 888         }
 889         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
 890
 891         memcpy(urb->transfer_buffer, current_position, transfer_size);
 892
 893         /* fill urb with data and submit  */
 894         if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
 895                 usb_fill_bulk_urb(urb,
 896                         serial->dev,
 897                         usb_sndbulkpipe(serial->dev,
 898                                 (port->bulk_out_endpointAddress) + 2),
 899                         urb->transfer_buffer,
 900                         transfer_size,
 901                         mos7840_bulk_out_data_callback, mos7840_port);
 902         } else {
 903                 usb_fill_bulk_urb(urb,
 904                         serial->dev,
 905                         usb_sndbulkpipe(serial->dev,
 906                                 port->bulk_out_endpointAddress),
 907                         urb->transfer_buffer,
 908                         transfer_size,
 909                         mos7840_bulk_out_data_callback, mos7840_port);
 910         }
 911
 912         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
 913
 914         if (mos7840_port->has_led)
 915                 mos7840_led_activity(port);
 916
 917         /* send it down the pipe */
 918         status = usb_submit_urb(urb, GFP_ATOMIC);
 919
 920         if (status) {
 921                 mos7840_port->busy[i] = 0;
 922                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
 923                         "with status = %d\n", __func__, status);
 924                 bytes_sent = status;
 925                 goto exit;
 926         }
 927         bytes_sent = transfer_size;
 928         port->icount.tx += transfer_size;
 929         dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
 930 exit:
 931         return bytes_sent;
 932
 933 }
 934
 935 /*****************************************************************************
 936  * mos7840_throttle
 937  *      this function is called by the tty driver when it wants to stop the data
 938  *      being read from the port.
 939  *****************************************************************************/
 940
 941 static void mos7840_throttle(struct tty_struct *tty)
 942 {
 943         struct usb_serial_port *port = tty->driver_data;
 944         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 945         int status;
 946
 947         /* if we are implementing XON/XOFF, send the stop character */
 948         if (I_IXOFF(tty)) {
 949                 unsigned char stop_char = STOP_CHAR(tty);
 950                 status = mos7840_write(tty, port, &stop_char, 1);
 951                 if (status <= 0)
 952                         return;
 953         }
 954         /* if we are implementing RTS/CTS, toggle that line */
 955         if (C_CRTSCTS(tty)) {
 956                 mos7840_port->shadowMCR &= ~MCR_RTS;
 957                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
 958                                          mos7840_port->shadowMCR);
 959                 if (status < 0)
 960                         return;
 961         }
 962 }
 963
 964 /*****************************************************************************
 965  * mos7840_unthrottle
 966  *      this function is called by the tty driver when it wants to resume
 967  *      the data being read from the port (called after mos7840_throttle is
 968  *      called)
 969  *****************************************************************************/
 970 static void mos7840_unthrottle(struct tty_struct *tty)
 971 {
 972         struct usb_serial_port *port = tty->driver_data;
 973         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
 974         int status;
 975
 976         /* if we are implementing XON/XOFF, send the start character */
 977         if (I_IXOFF(tty)) {
 978                 unsigned char start_char = START_CHAR(tty);
 979                 status = mos7840_write(tty, port, &start_char, 1);
 980                 if (status <= 0)
 981                         return;
 982         }
 983
 984         /* if we are implementing RTS/CTS, toggle that line */
 985         if (C_CRTSCTS(tty)) {
 986                 mos7840_port->shadowMCR |= MCR_RTS;
 987                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
 988                                          mos7840_port->shadowMCR);
 989                 if (status < 0)
 990                         return;
 991         }
 992 }
 993
 994 static int mos7840_tiocmget(struct tty_struct *tty)
 995 {
 996         struct usb_serial_port *port = tty->driver_data;
 997         unsigned int result;
 998         __u16 msr;
 999         __u16 mcr;
1000         int status;
1001
1002         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1003         if (status < 0)
1004                 return -EIO;
1005         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1006         if (status < 0)
1007                 return -EIO;
1008         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1009             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1010             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1011             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1012             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1013             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1014             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1015
1016         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1017
1018         return result;
1019 }
1020
1021 static int mos7840_tiocmset(struct tty_struct *tty,
1022                             unsigned int set, unsigned int clear)
1023 {
1024         struct usb_serial_port *port = tty->driver_data;
1025         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1026         unsigned int mcr;
1027         int status;
1028
1029         /* FIXME: What locks the port registers ? */
1030         mcr = mos7840_port->shadowMCR;
1031         if (clear & TIOCM_RTS)
1032                 mcr &= ~MCR_RTS;
1033         if (clear & TIOCM_DTR)
1034                 mcr &= ~MCR_DTR;
1035         if (clear & TIOCM_LOOP)
1036                 mcr &= ~MCR_LOOPBACK;
1037
1038         if (set & TIOCM_RTS)
1039                 mcr |= MCR_RTS;
1040         if (set & TIOCM_DTR)
1041                 mcr |= MCR_DTR;
1042         if (set & TIOCM_LOOP)
1043                 mcr |= MCR_LOOPBACK;
1044
1045         mos7840_port->shadowMCR = mcr;
1046
1047         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1048         if (status < 0) {
1049                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1050                 return status;
1051         }
1052
1053         return 0;
1054 }
1055
1056 /*****************************************************************************
1057  * mos7840_calc_baud_rate_divisor
1058  *      this function calculates the proper baud rate divisor for the specified
1059  *      baud rate.
1060  *****************************************************************************/
1061 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1062                                           int baudRate, int *divisor,
1063                                           __u16 *clk_sel_val)
1064 {
1065         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1066
1067         if (baudRate <= 115200) {
1068                 *divisor = 115200 / baudRate;
1069                 *clk_sel_val = 0x0;
1070         }
1071         if ((baudRate > 115200) && (baudRate <= 230400)) {
1072                 *divisor = 230400 / baudRate;
1073                 *clk_sel_val = 0x10;
1074         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1075                 *divisor = 403200 / baudRate;
1076                 *clk_sel_val = 0x20;
1077         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1078                 *divisor = 460800 / baudRate;
1079                 *clk_sel_val = 0x30;
1080         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1081                 *divisor = 806400 / baudRate;
1082                 *clk_sel_val = 0x40;
1083         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1084                 *divisor = 921600 / baudRate;
1085                 *clk_sel_val = 0x50;
1086         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1087                 *divisor = 1572864 / baudRate;
1088                 *clk_sel_val = 0x60;
1089         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1090                 *divisor = 3145728 / baudRate;
1091                 *clk_sel_val = 0x70;
1092         }
1093         return 0;
1094 }
1095
1096 /*****************************************************************************
1097  * mos7840_send_cmd_write_baud_rate
1098  *      this function sends the proper command to change the baud rate of the
1099  *      specified port.
1100  *****************************************************************************/
1101
1102 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1103                                             int baudRate)
1104 {
1105         struct usb_serial_port *port = mos7840_port->port;
1106         int divisor = 0;
1107         int status;
1108         __u16 Data;
1109         __u16 clk_sel_val;
1110
1111         dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1112         /* reset clk_uart_sel in spregOffset */
1113         if (baudRate > 115200) {
1114 #ifdef HW_flow_control
1115                 /* NOTE: need to see the pther register to modify */
1116                 /* setting h/w flow control bit to 1 */
1117                 Data = 0x2b;
1118                 mos7840_port->shadowMCR = Data;
1119                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1120                                                                         Data);
1121                 if (status < 0) {
1122                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1123                         return -1;
1124                 }
1125 #endif
1126
1127         } else {
1128 #ifdef HW_flow_control
1129                 /* setting h/w flow control bit to 0 */
1130                 Data = 0xb;
1131                 mos7840_port->shadowMCR = Data;
1132                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1133                                                                         Data);
1134                 if (status < 0) {
1135                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1136                         return -1;
1137                 }
1138 #endif
1139
1140         }
1141
1142         if (1) {                /* baudRate <= 115200) */
1143                 clk_sel_val = 0x0;
1144                 Data = 0x0;
1145                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1146                                                    &clk_sel_val);
1147                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1148                                                                  &Data);
1149                 if (status < 0) {
1150                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1151                         return -1;
1152                 }
1153                 Data = (Data & 0x8f) | clk_sel_val;
1154                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1155                                                                 Data);
1156                 if (status < 0) {
1157                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1158                         return -1;
1159                 }
1160                 /* Calculate the Divisor */
1161
1162                 if (status) {
1163                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1164                         return status;
1165                 }
1166                 /* Enable access to divisor latch */
1167                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1168                 mos7840_port->shadowLCR = Data;
1169                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1170
1171                 /* Write the divisor */
1172                 Data = (unsigned char)(divisor & 0xff);
1173                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1174                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1175
1176                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1177                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1178                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1179
1180                 /* Disable access to divisor latch */
1181                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1182                 mos7840_port->shadowLCR = Data;
1183                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1184
1185         }
1186         return status;
1187 }
1188
1189 /*****************************************************************************
1190  * mos7840_change_port_settings
1191  *      This routine is called to set the UART on the device to match
1192  *      the specified new settings.
1193  *****************************************************************************/
1194
1195 static void mos7840_change_port_settings(struct tty_struct *tty,
1196         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1197 {
1198         struct usb_serial_port *port = mos7840_port->port;
1199         int baud;
1200         unsigned cflag;
1201         __u8 lData;
1202         __u8 lParity;
1203         __u8 lStop;
1204         int status;
1205         __u16 Data;
1206
1207         lData = LCR_BITS_8;
1208         lStop = LCR_STOP_1;
1209         lParity = LCR_PAR_NONE;
1210
1211         cflag = tty->termios.c_cflag;
1212
1213         /* Change the number of bits */
1214         switch (cflag & CSIZE) {
1215         case CS5:
1216                 lData = LCR_BITS_5;
1217                 break;
1218
1219         case CS6:
1220                 lData = LCR_BITS_6;
1221                 break;
1222
1223         case CS7:
1224                 lData = LCR_BITS_7;
1225                 break;
1226
1227         default:
1228         case CS8:
1229                 lData = LCR_BITS_8;
1230                 break;
1231         }
1232
1233         /* Change the Parity bit */
1234         if (cflag & PARENB) {
1235                 if (cflag & PARODD) {
1236                         lParity = LCR_PAR_ODD;
1237                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1238                 } else {
1239                         lParity = LCR_PAR_EVEN;
1240                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1241                 }
1242
1243         } else {
1244                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1245         }
1246
1247         if (cflag & CMSPAR)
1248                 lParity = lParity | 0x20;
1249
1250         /* Change the Stop bit */
1251         if (cflag & CSTOPB) {
1252                 lStop = LCR_STOP_2;
1253                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1254         } else {
1255                 lStop = LCR_STOP_1;
1256                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1257         }
1258
1259         /* Update the LCR with the correct value */
1260         mos7840_port->shadowLCR &=
1261             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1262         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1263
1264         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1265                 mos7840_port->shadowLCR);
1266         /* Disable Interrupts */
1267         Data = 0x00;
1268         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1269
1270         Data = 0x00;
1271         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1272
1273         Data = 0xcf;
1274         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1275
1276         /* Send the updated LCR value to the mos7840 */
1277         Data = mos7840_port->shadowLCR;
1278
1279         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1280
1281         Data = 0x00b;
1282         mos7840_port->shadowMCR = Data;
1283         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1284         Data = 0x00b;
1285         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1286
1287         /* set up the MCR register and send it to the mos7840 */
1288
1289         mos7840_port->shadowMCR = MCR_MASTER_IE;
1290         if (cflag & CBAUD)
1291                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1292
1293         if (cflag & CRTSCTS)
1294                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1295         else
1296                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1297
1298         Data = mos7840_port->shadowMCR;
1299         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1300
1301         /* Determine divisor based on baud rate */
1302         baud = tty_get_baud_rate(tty);
1303
1304         if (!baud) {
1305                 /* pick a default, any default... */
1306                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1307                 baud = 9600;
1308         }
1309
1310         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1311         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1312
1313         /* Enable Interrupts */
1314         Data = 0x0c;
1315         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1316
1317         if (!mos7840_port->read_urb_busy) {
1318                 mos7840_port->read_urb_busy = true;
1319                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1320                 if (status) {
1321                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1322                             status);
1323                         mos7840_port->read_urb_busy = false;
1324                 }
1325         }
1326         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1327                 mos7840_port->shadowLCR);
1328 }
1329
1330 /*****************************************************************************
1331  * mos7840_set_termios
1332  *      this function is called by the tty driver when it wants to change
1333  *      the termios structure
1334  *****************************************************************************/
1335
1336 static void mos7840_set_termios(struct tty_struct *tty,
1337                                 struct usb_serial_port *port,
1338                                 struct ktermios *old_termios)
1339 {
1340         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1341         int status;
1342
1343         /* change the port settings to the new ones specified */
1344
1345         mos7840_change_port_settings(tty, mos7840_port, old_termios);
1346
1347         if (!mos7840_port->read_urb_busy) {
1348                 mos7840_port->read_urb_busy = true;
1349                 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1350                 if (status) {
1351                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1352                             status);
1353                         mos7840_port->read_urb_busy = false;
1354                 }
1355         }
1356 }
1357
1358 /*****************************************************************************
1359  * mos7840_get_lsr_info - get line status register info
1360  *
1361  * Purpose: Let user call ioctl() to get info when the UART physically
1362  *          is emptied.  On bus types like RS485, the transmitter must
1363  *          release the bus after transmitting. This must be done when
1364  *          the transmit shift register is empty, not be done when the
1365  *          transmit holding register is empty.  This functionality
1366  *          allows an RS485 driver to be written in user space.
1367  *****************************************************************************/
1368
1369 static int mos7840_get_lsr_info(struct tty_struct *tty,
1370                                 unsigned int __user *value)
1371 {
1372         int count;
1373         unsigned int result = 0;
1374
1375         count = mos7840_chars_in_buffer(tty);
1376         if (count == 0)
1377                 result = TIOCSER_TEMT;
1378
1379         if (copy_to_user(value, &result, sizeof(int)))
1380                 return -EFAULT;
1381         return 0;
1382 }
1383
1384 /*****************************************************************************
1385  * mos7840_get_serial_info
1386  *      function to get information about serial port
1387  *****************************************************************************/
1388
1389 static int mos7840_get_serial_info(struct tty_struct *tty,
1390                                    struct serial_struct *ss)
1391 {
1392         struct usb_serial_port *port = tty->driver_data;
1393         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1394
1395         ss->type = PORT_16550A;
1396         ss->line = mos7840_port->port->minor;
1397         ss->port = mos7840_port->port->port_number;
1398         ss->irq = 0;
1399         ss->xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1400         ss->baud_base = 9600;
1401         ss->close_delay = 5 * HZ;
1402         ss->closing_wait = 30 * HZ;
1403         return 0;
1404 }
1405
1406 /*****************************************************************************
1407  * SerialIoctl
1408  *      this function handles any ioctl calls to the driver
1409  *****************************************************************************/
1410
1411 static int mos7840_ioctl(struct tty_struct *tty,
1412                          unsigned int cmd, unsigned long arg)
1413 {
1414         struct usb_serial_port *port = tty->driver_data;
1415         void __user *argp = (void __user *)arg;
1416
1417         switch (cmd) {
1418                 /* return number of bytes available */
1419
1420         case TIOCSERGETLSR:
1421                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1422                 return mos7840_get_lsr_info(tty, argp);
1423
1424         default:
1425                 break;
1426         }
1427         return -ENOIOCTLCMD;
1428 }
1429
1430 /*
1431  * Check if GPO (pin 42) is connected to GPI (pin 33) as recommended by ASIX
1432  * for MCS7810 by bit-banging a 16-bit word.
1433  *
1434  * Note that GPO is really RTS of the third port so this will toggle RTS of
1435  * port two or three on two- and four-port devices.
1436  */
1437 static int mos7810_check(struct usb_serial *serial)
1438 {
1439         int i, pass_count = 0;
1440         u8 *buf;
1441         __u16 data = 0, mcr_data = 0;
1442         __u16 test_pattern = 0x55AA;
1443         int res;
1444
1445         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1446         if (!buf)
1447                 return 0;       /* failed to identify 7810 */
1448
1449         /* Store MCR setting */
1450         res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1451                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
1452                 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1453         if (res == VENDOR_READ_LENGTH)
1454                 mcr_data = *buf;
1455
1456         for (i = 0; i < 16; i++) {
1457                 /* Send the 1-bit test pattern out to MCS7810 test pin */
1458                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1459                         MCS_WRREQ, MCS_WR_RTYPE,
1460                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
1461                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
1462
1463                 /* Read the test pattern back */
1464                 res = usb_control_msg(serial->dev,
1465                                 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
1466                                 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1467                                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1468                 if (res == VENDOR_READ_LENGTH)
1469                         data = *buf;
1470
1471                 /* If this is a MCS7810 device, both test patterns must match */
1472                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
1473                         break;
1474
1475                 pass_count++;
1476         }
1477
1478         /* Restore MCR setting */
1479         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
1480                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
1481                 0, MOS_WDR_TIMEOUT);
1482
1483         kfree(buf);
1484
1485         if (pass_count == 16)
1486                 return 1;
1487
1488         return 0;
1489 }
1490
1491 static int mos7840_probe(struct usb_serial *serial,
1492                                 const struct usb_device_id *id)
1493 {
1494         unsigned long device_flags = id->driver_info;
1495         u8 *buf;
1496
1497         /* Skip device-type detection if we already have device flags. */
1498         if (device_flags)
1499                 goto out;
1500
1501         buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1502         if (!buf)
1503                 return -ENOMEM;
1504
1505         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1506                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1507                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1508
1509         /* For a MCS7840 device GPIO0 must be set to 1 */
1510         if (buf[0] & 0x01)
1511                 device_flags = MCS_PORTS(4);
1512         else if (mos7810_check(serial))
1513                 device_flags = MCS_PORTS(1) | MCS_LED;
1514         else
1515                 device_flags = MCS_PORTS(2);
1516
1517         kfree(buf);
1518 out:
1519         usb_set_serial_data(serial, (void *)device_flags);
1520
1521         return 0;
1522 }
1523
1524 static int mos7840_calc_num_ports(struct usb_serial *serial,
1525                                         struct usb_serial_endpoints *epds)
1526 {
1527         unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
1528         int num_ports = MCS_PORTS(device_flags);
1529
1530         if (num_ports == 0 || num_ports > 4)
1531                 return -ENODEV;
1532
1533         if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
1534                 dev_err(&serial->interface->dev, "missing endpoints\n");
1535                 return -ENODEV;
1536         }
1537
1538         return num_ports;
1539 }
1540
1541 static int mos7840_attach(struct usb_serial *serial)
1542 {
1543         struct device *dev = &serial->interface->dev;
1544         int status;
1545         u16 val;
1546
1547         /* Zero Length flag enable */
1548         val = 0x0f;
1549         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, val);
1550         if (status < 0)
1551                 dev_dbg(dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
1552         else
1553                 dev_dbg(dev, "ZLP_REG5 Writing success status%d\n", status);
1554
1555         return status;
1556 }
1557
1558 static int mos7840_port_probe(struct usb_serial_port *port)
1559 {
1560         struct usb_serial *serial = port->serial;
1561         unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
1562         struct moschip_port *mos7840_port;
1563         int status;
1564         int pnum;
1565         __u16 Data;
1566
1567         /* we set up the pointers to the endpoints in the mos7840_open *
1568          * function, as the structures aren't created yet.             */
1569
1570         pnum = port->port_number;
1571
1572         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
1573         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
1574         if (!mos7840_port)
1575                 return -ENOMEM;
1576
1577         /* Initialize all port interrupt end point to port 0 int
1578          * endpoint. Our device has only one interrupt end point
1579          * common to all port */
1580
1581         mos7840_port->port = port;
1582         spin_lock_init(&mos7840_port->pool_lock);
1583
1584         /* minor is not initialised until later by
1585          * usb-serial.c:get_free_serial() and cannot therefore be used
1586          * to index device instances */
1587         mos7840_port->port_num = pnum + 1;
1588         dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
1589         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
1590
1591         if (mos7840_port->port_num == 1) {
1592                 mos7840_port->SpRegOffset = 0x0;
1593                 mos7840_port->ControlRegOffset = 0x1;
1594                 mos7840_port->DcrRegOffset = 0x4;
1595         } else {
1596                 u8 phy_num = mos7840_port->port_num;
1597
1598                 /* Port 2 in the 2-port case uses registers of port 3 */
1599                 if (serial->num_ports == 2)
1600                         phy_num = 3;
1601
1602                 mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2);
1603                 mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2);
1604                 mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2);
1605         }
1606         mos7840_dump_serial_port(port, mos7840_port);
1607         usb_set_serial_port_data(port, mos7840_port);
1608
1609         /* enable rx_disable bit in control register */
1610         status = mos7840_get_reg_sync(port,
1611                         mos7840_port->ControlRegOffset, &Data);
1612         if (status < 0) {
1613                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
1614                 goto error;
1615         } else
1616                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
1617         Data |= 0x08;   /* setting driver done bit */
1618         Data |= 0x04;   /* sp1_bit to have cts change reflect in
1619                            modem status reg */
1620
1621         /* Data |= 0x20; //rx_disable bit */
1622         status = mos7840_set_reg_sync(port,
1623                         mos7840_port->ControlRegOffset, Data);
1624         if (status < 0) {
1625                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
1626                 goto error;
1627         } else
1628                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
1629
1630         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
1631            and 0x24 in DCR3 */
1632         Data = 0x01;
1633         status = mos7840_set_reg_sync(port,
1634                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
1635         if (status < 0) {
1636                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
1637                 goto error;
1638         } else
1639                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
1640
1641         Data = 0x05;
1642         status = mos7840_set_reg_sync(port,
1643                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
1644         if (status < 0) {
1645                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
1646                 goto error;
1647         } else
1648                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
1649
1650         Data = 0x24;
1651         status = mos7840_set_reg_sync(port,
1652                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
1653         if (status < 0) {
1654                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
1655                 goto error;
1656         } else
1657                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
1658
1659         /* write values in clkstart0x0 and clkmulti 0x20 */
1660         Data = 0x0;
1661         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
1662         if (status < 0) {
1663                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
1664                 goto error;
1665         } else
1666                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
1667
1668         Data = 0x20;
1669         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
1670         if (status < 0) {
1671                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
1672                 goto error;
1673         } else
1674                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
1675
1676         /* write value 0x0 to scratchpad register */
1677         Data = 0x00;
1678         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
1679         if (status < 0) {
1680                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
1681                 goto error;
1682         } else
1683                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
1684
1685         /* Zero Length flag register */
1686         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
1687                 Data = 0xff;
1688                 status = mos7840_set_reg_sync(port,
1689                                 (__u16) (ZLP_REG1 +
1690                                         ((__u16)mos7840_port->port_num)), Data);
1691                 dev_dbg(&port->dev, "ZLIP offset %x\n",
1692                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
1693                 if (status < 0) {
1694                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
1695                         goto error;
1696                 } else
1697                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
1698         } else {
1699                 Data = 0xff;
1700                 status = mos7840_set_reg_sync(port,
1701                                 (__u16) (ZLP_REG1 +
1702                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
1703                 dev_dbg(&port->dev, "ZLIP offset %x\n",
1704                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
1705                 if (status < 0) {
1706                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
1707                         goto error;
1708                 } else
1709                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
1710
1711         }
1712
1713         mos7840_port->has_led = device_flags & MCS_LED;
1714
1715         /* Initialize LED timers */
1716         if (mos7840_port->has_led) {
1717                 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
1718                 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
1719                                                                 GFP_KERNEL);
1720                 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
1721                         status = -ENOMEM;
1722                         goto error;
1723                 }
1724
1725                 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
1726                 mos7840_port->led_timer1.expires =
1727                         jiffies + msecs_to_jiffies(LED_ON_MS);
1728                 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
1729                             0);
1730                 mos7840_port->led_timer2.expires =
1731                         jiffies + msecs_to_jiffies(LED_OFF_MS);
1732
1733                 /* Turn off LED */
1734                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
1735         }
1736
1737         return 0;
1738 error:
1739         kfree(mos7840_port->led_dr);
1740         usb_free_urb(mos7840_port->led_urb);
1741         kfree(mos7840_port);
1742
1743         return status;
1744 }
1745
1746 static int mos7840_port_remove(struct usb_serial_port *port)
1747 {
1748         struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1749
1750         if (mos7840_port->has_led) {
1751                 /* Turn off LED */
1752                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
1753
1754                 del_timer_sync(&mos7840_port->led_timer1);
1755                 del_timer_sync(&mos7840_port->led_timer2);
1756
1757                 usb_kill_urb(mos7840_port->led_urb);
1758                 usb_free_urb(mos7840_port->led_urb);
1759                 kfree(mos7840_port->led_dr);
1760         }
1761
1762         kfree(mos7840_port);
1763
1764         return 0;
1765 }
1766
1767 static struct usb_serial_driver moschip7840_4port_device = {
1768         .driver = {
1769                    .owner = THIS_MODULE,
1770                    .name = "mos7840",
1771                    },
1772         .description = DRIVER_DESC,
1773         .id_table = id_table,
1774         .num_interrupt_in = 1,
1775         .open = mos7840_open,
1776         .close = mos7840_close,
1777         .write = mos7840_write,
1778         .write_room = mos7840_write_room,
1779         .chars_in_buffer = mos7840_chars_in_buffer,
1780         .throttle = mos7840_throttle,
1781         .unthrottle = mos7840_unthrottle,
1782         .calc_num_ports = mos7840_calc_num_ports,
1783         .probe = mos7840_probe,
1784         .attach = mos7840_attach,
1785         .ioctl = mos7840_ioctl,
1786         .get_serial = mos7840_get_serial_info,
1787         .set_termios = mos7840_set_termios,
1788         .break_ctl = mos7840_break,
1789         .tiocmget = mos7840_tiocmget,
1790         .tiocmset = mos7840_tiocmset,
1791         .get_icount = usb_serial_generic_get_icount,
1792         .port_probe = mos7840_port_probe,
1793         .port_remove = mos7840_port_remove,
1794         .read_bulk_callback = mos7840_bulk_in_callback,
1795 };
1796
1797 static struct usb_serial_driver * const serial_drivers[] = {
1798         &moschip7840_4port_device, NULL
1799 };
1800
1801 module_usb_serial_driver(serial_drivers, id_table);
1802
1803 MODULE_DESCRIPTION(DRIVER_DESC);
1804 MODULE_LICENSE("GPL");