drivers/usb/serial/ch341.c

   1 /*
   2  * Copyright 2007, Frank A Kingswood <frank@kingswood-consulting.co.uk>
   3  * Copyright 2007, Werner Cornelius <werner@cornelius-consult.de>
   4  * Copyright 2009, Boris Hajduk <boris@hajduk.org>
   5  *
   6  * ch341.c implements a serial port driver for the Winchiphead CH341.
   7  *
   8  * The CH341 device can be used to implement an RS232 asynchronous
   9  * serial port, an IEEE-1284 parallel printer port or a memory-like
  10  * interface. In all cases the CH341 supports an I2C interface as well.
  11  * This driver only supports the asynchronous serial interface.
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License version
  15  * 2 as published by the Free Software Foundation.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/tty.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/usb.h>
  24 #include <linux/usb/serial.h>
  25 #include <linux/serial.h>
  26 #include <asm/unaligned.h>
  27
  28 #define DEFAULT_BAUD_RATE 9600
  29 #define DEFAULT_TIMEOUT   1000
  30
  31 /* flags for IO-Bits */
  32 #define CH341_BIT_RTS (1 << 6)
  33 #define CH341_BIT_DTR (1 << 5)
  34
  35 /******************************/
  36 /* interrupt pipe definitions */
  37 /******************************/
  38 /* always 4 interrupt bytes */
  39 /* first irq byte normally 0x08 */
  40 /* second irq byte base 0x7d + below */
  41 /* third irq byte base 0x94 + below */
  42 /* fourth irq byte normally 0xee */
  43
  44 /* second interrupt byte */
  45 #define CH341_MULT_STAT 0x04 /* multiple status since last interrupt event */
  46
  47 /* status returned in third interrupt answer byte, inverted in data
  48    from irq */
  49 #define CH341_BIT_CTS 0x01
  50 #define CH341_BIT_DSR 0x02
  51 #define CH341_BIT_RI  0x04
  52 #define CH341_BIT_DCD 0x08
  53 #define CH341_BITS_MODEM_STAT 0x0f /* all bits */
  54
  55 /*******************************/
  56 /* baudrate calculation factor */
  57 /*******************************/
  58 #define CH341_BAUDBASE_FACTOR 1532620800
  59 #define CH341_BAUDBASE_DIVMAX 3
  60
  61 /* Break support - the information used to implement this was gleaned from
  62  * the Net/FreeBSD uchcom.c driver by Takanori Watanabe.  Domo arigato.
  63  */
  64
  65 #define CH341_REQ_READ_VERSION 0x5F
  66 #define CH341_REQ_WRITE_REG    0x9A
  67 #define CH341_REQ_READ_REG     0x95
  68 #define CH341_REQ_SERIAL_INIT  0xA1
  69 #define CH341_REQ_MODEM_CTRL   0xA4
  70
  71 #define CH341_REG_BREAK        0x05
  72 #define CH341_REG_LCR          0x18
  73 #define CH341_NBREAK_BITS      0x01
  74
  75 #define CH341_LCR_ENABLE_RX    0x80
  76 #define CH341_LCR_ENABLE_TX    0x40
  77 #define CH341_LCR_MARK_SPACE   0x20
  78 #define CH341_LCR_PAR_EVEN     0x10
  79 #define CH341_LCR_ENABLE_PAR   0x08
  80 #define CH341_LCR_STOP_BITS_2  0x04
  81 #define CH341_LCR_CS8          0x03
  82 #define CH341_LCR_CS7          0x02
  83 #define CH341_LCR_CS6          0x01
  84 #define CH341_LCR_CS5          0x00
  85
  86 static int debug;
  87
  88 static const struct usb_device_id id_table[] = {
  89         { USB_DEVICE(0x4348, 0x5523) },
  90         { USB_DEVICE(0x1a86, 0x7523) },
  91         { USB_DEVICE(0x1a86, 0x5523) },
  92         { },
  93 };
  94 MODULE_DEVICE_TABLE(usb, id_table);
  95
  96 struct ch341_private {
  97         spinlock_t lock; /* access lock */
  98         unsigned baud_rate; /* set baud rate */
  99         u8 line_control; /* set line control value RTS/DTR */
 100         u8 line_status; /* active status of modem control inputs */
 101         u8 multi_status_change; /* status changed multiple since last call */
 102 };
 103
 104 static void ch341_set_termios(struct tty_struct *tty,
 105                               struct usb_serial_port *port,
 106                               struct ktermios *old_termios);
 107
 108 static int ch341_control_out(struct usb_device *dev, u8 request,
 109                              u16 value, u16 index)
 110 {
 111         int r;
 112         dbg("ch341_control_out(%02x,%02x,%04x,%04x)", USB_DIR_OUT|0x40,
 113                 (int)request, (int)value, (int)index);
 114
 115         r = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request,
 116                             USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_OUT,
 117                             value, index, NULL, 0, DEFAULT_TIMEOUT);
 118
 119         return r;
 120 }
 121
 122 static int ch341_control_in(struct usb_device *dev,
 123                             u8 request, u16 value, u16 index,
 124                             char *buf, unsigned bufsize)
 125 {
 126         int r;
 127         dbg("ch341_control_in(%02x,%02x,%04x,%04x,%p,%u)", USB_DIR_IN|0x40,
 128                 (int)request, (int)value, (int)index, buf, (int)bufsize);
 129
 130         r = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), request,
 131                             USB_TYPE_VENDOR | USB_RECIP_DEVICE | USB_DIR_IN,
 132                             value, index, buf, bufsize, DEFAULT_TIMEOUT);
 133         return r;
 134 }
 135
 136 static int ch341_set_baudrate(struct usb_device *dev,
 137                               struct ch341_private *priv)
 138 {
 139         short a, b;
 140         int r;
 141         unsigned long factor;
 142         short divisor;
 143
 144         dbg("ch341_set_baudrate(%d)", priv->baud_rate);
 145
 146         if (!priv->baud_rate)
 147                 return -EINVAL;
 148         factor = (CH341_BAUDBASE_FACTOR / priv->baud_rate);
 149         divisor = CH341_BAUDBASE_DIVMAX;
 150
 151         while ((factor > 0xfff0) && divisor) {
 152                 factor >>= 3;
 153                 divisor--;
 154         }
 155
 156         if (factor > 0xfff0)
 157                 return -EINVAL;
 158
 159         factor = 0x10000 - factor;
 160         a = (factor & 0xff00) | divisor;
 161         b = factor & 0xff;
 162
 163         r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x1312, a);
 164         if (!r)
 165                 r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x0f2c, b);
 166
 167         return r;
 168 }
 169
 170 static int ch341_set_handshake(struct usb_device *dev, u8 control)
 171 {
 172         dbg("ch341_set_handshake(0x%02x)", control);
 173         return ch341_control_out(dev, CH341_REQ_MODEM_CTRL, ~control, 0);
 174 }
 175
 176 static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv)
 177 {
 178         char *buffer;
 179         int r;
 180         const unsigned size = 8;
 181         unsigned long flags;
 182
 183         dbg("ch341_get_status()");
 184
 185         buffer = kmalloc(size, GFP_KERNEL);
 186         if (!buffer)
 187                 return -ENOMEM;
 188
 189         r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x0706, 0, buffer, size);
 190         if (r < 0)
 191                 goto out;
 192
 193         /* setup the private status if available */
 194         if (r == 2) {
 195                 r = 0;
 196                 spin_lock_irqsave(&priv->lock, flags);
 197                 priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT;
 198                 priv->multi_status_change = 0;
 199                 spin_unlock_irqrestore(&priv->lock, flags);
 200         } else
 201                 r = -EPROTO;
 202
 203 out:    kfree(buffer);
 204         return r;
 205 }
 206
 207 /* -------------------------------------------------------------------------- */
 208
 209 static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
 210 {
 211         char *buffer;
 212         int r;
 213         const unsigned size = 8;
 214
 215         dbg("ch341_configure()");
 216
 217         buffer = kmalloc(size, GFP_KERNEL);
 218         if (!buffer)
 219                 return -ENOMEM;
 220
 221         /* expect two bytes 0x27 0x00 */
 222         r = ch341_control_in(dev, CH341_REQ_READ_VERSION, 0, 0, buffer, size);
 223         if (r < 0)
 224                 goto out;
 225
 226         r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0, 0);
 227         if (r < 0)
 228                 goto out;
 229
 230         r = ch341_set_baudrate(dev, priv);
 231         if (r < 0)
 232                 goto out;
 233
 234         /* expect two bytes 0x56 0x00 */
 235         r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x2518, 0, buffer, size);
 236         if (r < 0)
 237                 goto out;
 238
 239         r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, 0x0050);
 240         if (r < 0)
 241                 goto out;
 242
 243         /* expect 0xff 0xee */
 244         r = ch341_get_status(dev, priv);
 245         if (r < 0)
 246                 goto out;
 247
 248         r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0x501f, 0xd90a);
 249         if (r < 0)
 250                 goto out;
 251
 252         r = ch341_set_baudrate(dev, priv);
 253         if (r < 0)
 254                 goto out;
 255
 256         r = ch341_set_handshake(dev, priv->line_control);
 257         if (r < 0)
 258                 goto out;
 259
 260         /* expect 0x9f 0xee */
 261         r = ch341_get_status(dev, priv);
 262
 263 out:    kfree(buffer);
 264         return r;
 265 }
 266
 267 /* allocate private data */
 268 static int ch341_attach(struct usb_serial *serial)
 269 {
 270         struct ch341_private *priv;
 271         int r;
 272
 273         dbg("ch341_attach()");
 274
 275         /* private data */
 276         priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL);
 277         if (!priv)
 278                 return -ENOMEM;
 279
 280         spin_lock_init(&priv->lock);
 281         priv->baud_rate = DEFAULT_BAUD_RATE;
 282         priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR;
 283
 284         r = ch341_configure(serial->dev, priv);
 285         if (r < 0)
 286                 goto error;
 287
 288         usb_set_serial_port_data(serial->port[0], priv);
 289         return 0;
 290
 291 error:  kfree(priv);
 292         return r;
 293 }
 294
 295 static int ch341_carrier_raised(struct usb_serial_port *port)
 296 {
 297         struct ch341_private *priv = usb_get_serial_port_data(port);
 298         if (priv->line_status & CH341_BIT_DCD)
 299                 return 1;
 300         return 0;
 301 }
 302
 303 static void ch341_dtr_rts(struct usb_serial_port *port, int on)
 304 {
 305         struct ch341_private *priv = usb_get_serial_port_data(port);
 306         unsigned long flags;
 307
 308         dbg("%s - port %d", __func__, port->number);
 309         /* drop DTR and RTS */
 310         spin_lock_irqsave(&priv->lock, flags);
 311         if (on)
 312                 priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR;
 313         else
 314                 priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR);
 315         spin_unlock_irqrestore(&priv->lock, flags);
 316         ch341_set_handshake(port->serial->dev, priv->line_control);
 317         wake_up_interruptible(&port->delta_msr_wait);
 318 }
 319
 320 static void ch341_close(struct usb_serial_port *port)
 321 {
 322         dbg("%s - port %d", __func__, port->number);
 323
 324         usb_serial_generic_close(port);
 325         usb_kill_urb(port->interrupt_in_urb);
 326 }
 327
 328
 329 /* open this device, set default parameters */
 330 static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port)
 331 {
 332         struct usb_serial *serial = port->serial;
 333         struct ch341_private *priv = usb_get_serial_port_data(serial->port[0]);
 334         int r;
 335
 336         dbg("ch341_open()");
 337
 338         r = ch341_configure(serial->dev, priv);
 339         if (r)
 340                 goto out;
 341
 342         if (tty)
 343                 ch341_set_termios(tty, port, NULL);
 344
 345         dbg("%s - submitting interrupt urb", __func__);
 346         port->interrupt_in_urb->dev = serial->dev;
 347         r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 348         if (r) {
 349                 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
 350                         " error %d\n", __func__, r);
 351                 goto out;
 352         }
 353
 354         r = usb_serial_generic_open(tty, port);
 355
 356 out:    return r;
 357 }
 358
 359 /* Old_termios contains the original termios settings and
 360  * tty->termios contains the new setting to be used.
 361  */
 362 static void ch341_set_termios(struct tty_struct *tty,
 363                 struct usb_serial_port *port, struct ktermios *old_termios)
 364 {
 365         struct ch341_private *priv = usb_get_serial_port_data(port);
 366         unsigned baud_rate;
 367         unsigned long flags;
 368
 369         dbg("ch341_set_termios()");
 370
 371         baud_rate = tty_get_baud_rate(tty);
 372
 373         priv->baud_rate = baud_rate;
 374
 375         if (baud_rate) {
 376                 spin_lock_irqsave(&priv->lock, flags);
 377                 priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS);
 378                 spin_unlock_irqrestore(&priv->lock, flags);
 379                 ch341_set_baudrate(port->serial->dev, priv);
 380         } else {
 381                 spin_lock_irqsave(&priv->lock, flags);
 382                 priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS);
 383                 spin_unlock_irqrestore(&priv->lock, flags);
 384         }
 385
 386         ch341_set_handshake(port->serial->dev, priv->line_control);
 387
 388         /* Unimplemented:
 389          * (cflag & CSIZE) : data bits [5, 8]
 390          * (cflag & PARENB) : parity {NONE, EVEN, ODD}
 391          * (cflag & CSTOPB) : stop bits [1, 2]
 392          */
 393 }
 394
 395 static void ch341_break_ctl(struct tty_struct *tty, int break_state)
 396 {
 397         const uint16_t ch341_break_reg =
 398                         ((uint16_t) CH341_REG_LCR << 8) | CH341_REG_BREAK;
 399         struct usb_serial_port *port = tty->driver_data;
 400         int r;
 401         uint16_t reg_contents;
 402         uint8_t *break_reg;
 403
 404         dbg("%s()", __func__);
 405
 406         break_reg = kmalloc(2, GFP_KERNEL);
 407         if (!break_reg) {
 408                 dev_err(&port->dev, "%s - kmalloc failed\n", __func__);
 409                 return;
 410         }
 411
 412         r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG,
 413                         ch341_break_reg, 0, break_reg, 2);
 414         if (r < 0) {
 415                 dev_err(&port->dev, "%s - USB control read error (%d)\n",
 416                                 __func__, r);
 417                 goto out;
 418         }
 419         dbg("%s - initial ch341 break register contents - reg1: %x, reg2: %x",
 420                         __func__, break_reg[0], break_reg[1]);
 421         if (break_state != 0) {
 422                 dbg("%s - Enter break state requested", __func__);
 423                 break_reg[0] &= ~CH341_NBREAK_BITS;
 424                 break_reg[1] &= ~CH341_LCR_ENABLE_TX;
 425         } else {
 426                 dbg("%s - Leave break state requested", __func__);
 427                 break_reg[0] |= CH341_NBREAK_BITS;
 428                 break_reg[1] |= CH341_LCR_ENABLE_TX;
 429         }
 430         dbg("%s - New ch341 break register contents - reg1: %x, reg2: %x",
 431                         __func__, break_reg[0], break_reg[1]);
 432         reg_contents = get_unaligned_le16(break_reg);
 433         r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG,
 434                         ch341_break_reg, reg_contents);
 435         if (r < 0)
 436                 dev_err(&port->dev, "%s - USB control write error (%d)\n",
 437                                 __func__, r);
 438 out:
 439         kfree(break_reg);
 440 }
 441
 442 static int ch341_tiocmset(struct tty_struct *tty,
 443                           unsigned int set, unsigned int clear)
 444 {
 445         struct usb_serial_port *port = tty->driver_data;
 446         struct ch341_private *priv = usb_get_serial_port_data(port);
 447         unsigned long flags;
 448         u8 control;
 449
 450         spin_lock_irqsave(&priv->lock, flags);
 451         if (set & TIOCM_RTS)
 452                 priv->line_control |= CH341_BIT_RTS;
 453         if (set & TIOCM_DTR)
 454                 priv->line_control |= CH341_BIT_DTR;
 455         if (clear & TIOCM_RTS)
 456                 priv->line_control &= ~CH341_BIT_RTS;
 457         if (clear & TIOCM_DTR)
 458                 priv->line_control &= ~CH341_BIT_DTR;
 459         control = priv->line_control;
 460         spin_unlock_irqrestore(&priv->lock, flags);
 461
 462         return ch341_set_handshake(port->serial->dev, control);
 463 }
 464
 465 static void ch341_read_int_callback(struct urb *urb)
 466 {
 467         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 468         unsigned char *data = urb->transfer_buffer;
 469         unsigned int actual_length = urb->actual_length;
 470         int status;
 471
 472         dbg("%s (%d)", __func__, port->number);
 473
 474         switch (urb->status) {
 475         case 0:
 476                 /* success */
 477                 break;
 478         case -ECONNRESET:
 479         case -ENOENT:
 480         case -ESHUTDOWN:
 481                 /* this urb is terminated, clean up */
 482                 dbg("%s - urb shutting down with status: %d", __func__,
 483                     urb->status);
 484                 return;
 485         default:
 486                 dbg("%s - nonzero urb status received: %d", __func__,
 487                     urb->status);
 488                 goto exit;
 489         }
 490
 491         usb_serial_debug_data(debug, &port->dev, __func__,
 492                               urb->actual_length, urb->transfer_buffer);
 493
 494         if (actual_length >= 4) {
 495                 struct ch341_private *priv = usb_get_serial_port_data(port);
 496                 unsigned long flags;
 497                 u8 prev_line_status = priv->line_status;
 498
 499                 spin_lock_irqsave(&priv->lock, flags);
 500                 priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT;
 501                 if ((data[1] & CH341_MULT_STAT))
 502                         priv->multi_status_change = 1;
 503                 spin_unlock_irqrestore(&priv->lock, flags);
 504
 505                 if ((priv->line_status ^ prev_line_status) & CH341_BIT_DCD) {
 506                         struct tty_struct *tty = tty_port_tty_get(&port->port);
 507                         if (tty)
 508                                 usb_serial_handle_dcd_change(port, tty,
 509                                             priv->line_status & CH341_BIT_DCD);
 510                         tty_kref_put(tty);
 511                 }
 512
 513                 wake_up_interruptible(&port->delta_msr_wait);
 514         }
 515
 516 exit:
 517         status = usb_submit_urb(urb, GFP_ATOMIC);
 518         if (status)
 519                 dev_err(&urb->dev->dev,
 520                         "%s - usb_submit_urb failed with result %d\n",
 521                         __func__, status);
 522 }
 523
 524 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 525 {
 526         struct ch341_private *priv = usb_get_serial_port_data(port);
 527         unsigned long flags;
 528         u8 prevstatus;
 529         u8 status;
 530         u8 changed;
 531         u8 multi_change = 0;
 532
 533         spin_lock_irqsave(&priv->lock, flags);
 534         prevstatus = priv->line_status;
 535         priv->multi_status_change = 0;
 536         spin_unlock_irqrestore(&priv->lock, flags);
 537
 538         while (!multi_change) {
 539                 interruptible_sleep_on(&port->delta_msr_wait);
 540                 /* see if a signal did it */
 541                 if (signal_pending(current))
 542                         return -ERESTARTSYS;
 543
 544                 if (port->serial->disconnected)
 545                         return -EIO;
 546
 547                 spin_lock_irqsave(&priv->lock, flags);
 548                 status = priv->line_status;
 549                 multi_change = priv->multi_status_change;
 550                 spin_unlock_irqrestore(&priv->lock, flags);
 551
 552                 changed = prevstatus ^ status;
 553
 554                 if (((arg & TIOCM_RNG) && (changed & CH341_BIT_RI)) ||
 555                     ((arg & TIOCM_DSR) && (changed & CH341_BIT_DSR)) ||
 556                     ((arg & TIOCM_CD)  && (changed & CH341_BIT_DCD)) ||
 557                     ((arg & TIOCM_CTS) && (changed & CH341_BIT_CTS))) {
 558                         return 0;
 559                 }
 560                 prevstatus = status;
 561         }
 562
 563         return 0;
 564 }
 565
 566 static int ch341_ioctl(struct tty_struct *tty,
 567                         unsigned int cmd, unsigned long arg)
 568 {
 569         struct usb_serial_port *port = tty->driver_data;
 570         dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);
 571
 572         switch (cmd) {
 573         case TIOCMIWAIT:
 574                 dbg("%s (%d) TIOCMIWAIT", __func__,  port->number);
 575                 return wait_modem_info(port, arg);
 576
 577         default:
 578                 dbg("%s not supported = 0x%04x", __func__, cmd);
 579                 break;
 580         }
 581
 582         return -ENOIOCTLCMD;
 583 }
 584
 585 static int ch341_tiocmget(struct tty_struct *tty)
 586 {
 587         struct usb_serial_port *port = tty->driver_data;
 588         struct ch341_private *priv = usb_get_serial_port_data(port);
 589         unsigned long flags;
 590         u8 mcr;
 591         u8 status;
 592         unsigned int result;
 593
 594         dbg("%s (%d)", __func__, port->number);
 595
 596         spin_lock_irqsave(&priv->lock, flags);
 597         mcr = priv->line_control;
 598         status = priv->line_status;
 599         spin_unlock_irqrestore(&priv->lock, flags);
 600
 601         result = ((mcr & CH341_BIT_DTR)         ? TIOCM_DTR : 0)
 602                   | ((mcr & CH341_BIT_RTS)      ? TIOCM_RTS : 0)
 603                   | ((status & CH341_BIT_CTS)   ? TIOCM_CTS : 0)
 604                   | ((status & CH341_BIT_DSR)   ? TIOCM_DSR : 0)
 605                   | ((status & CH341_BIT_RI)    ? TIOCM_RI  : 0)
 606                   | ((status & CH341_BIT_DCD)   ? TIOCM_CD  : 0);
 607
 608         dbg("%s - result = %x", __func__, result);
 609
 610         return result;
 611 }
 612
 613
 614 static int ch341_reset_resume(struct usb_interface *intf)
 615 {
 616         struct usb_device *dev = interface_to_usbdev(intf);
 617         struct usb_serial *serial = NULL;
 618         struct ch341_private *priv;
 619
 620         serial = usb_get_intfdata(intf);
 621         priv = usb_get_serial_port_data(serial->port[0]);
 622
 623         /*reconfigure ch341 serial port after bus-reset*/
 624         ch341_configure(dev, priv);
 625
 626         usb_serial_resume(intf);
 627
 628         return 0;
 629 }
 630
 631 static struct usb_driver ch341_driver = {
 632         .name           = "ch341",
 633         .probe          = usb_serial_probe,
 634         .disconnect     = usb_serial_disconnect,
 635         .suspend        = usb_serial_suspend,
 636         .resume         = usb_serial_resume,
 637         .reset_resume   = ch341_reset_resume,
 638         .id_table       = id_table,
 639         .no_dynamic_id  = 1,
 640         .supports_autosuspend = 1,
 641 };
 642
 643 static struct usb_serial_driver ch341_device = {
 644         .driver = {
 645                 .owner  = THIS_MODULE,
 646                 .name   = "ch341-uart",
 647         },
 648         .id_table          = id_table,
 649         .usb_driver        = &ch341_driver,
 650         .num_ports         = 1,
 651         .open              = ch341_open,
 652         .dtr_rts           = ch341_dtr_rts,
 653         .carrier_raised    = ch341_carrier_raised,
 654         .close             = ch341_close,
 655         .ioctl             = ch341_ioctl,
 656         .set_termios       = ch341_set_termios,
 657         .break_ctl         = ch341_break_ctl,
 658         .tiocmget          = ch341_tiocmget,
 659         .tiocmset          = ch341_tiocmset,
 660         .read_int_callback = ch341_read_int_callback,
 661         .attach            = ch341_attach,
 662 };
 663
 664 static int __init ch341_init(void)
 665 {
 666         int retval;
 667
 668         retval = usb_serial_register(&ch341_device);
 669         if (retval)
 670                 return retval;
 671         retval = usb_register(&ch341_driver);
 672         if (retval)
 673                 usb_serial_deregister(&ch341_device);
 674         return retval;
 675 }
 676
 677 static void __exit ch341_exit(void)
 678 {
 679         usb_deregister(&ch341_driver);
 680         usb_serial_deregister(&ch341_device);
 681 }
 682
 683 module_init(ch341_init);
 684 module_exit(ch341_exit);
 685 MODULE_LICENSE("GPL");
 686
 687 module_param(debug, bool, S_IRUGO | S_IWUSR);
 688 MODULE_PARM_DESC(debug, "Debug enabled or not");
 689
 690 /* EOF ch341.c */