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_init_set_baudrate(struct usb_device *dev,
 137                                    struct ch341_private *priv, unsigned ctrl)
 138 {
 139         short a;
 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
 162         /* 0x9c is "enable SFR_UART Control register and timer" */
 163         r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT,
 164                               0x9c | (ctrl << 8), a | 0x80);
 165
 166         return r;
 167 }
 168
 169 static int ch341_set_handshake(struct usb_device *dev, u8 control)
 170 {
 171         dbg("ch341_set_handshake(0x%02x)", control);
 172         return ch341_control_out(dev, CH341_REQ_MODEM_CTRL, ~control, 0);
 173 }
 174
 175 static int ch341_get_status(struct usb_device *dev, struct ch341_private *priv)
 176 {
 177         char *buffer;
 178         int r;
 179         const unsigned size = 8;
 180         unsigned long flags;
 181
 182         dbg("ch341_get_status()");
 183
 184         buffer = kmalloc(size, GFP_KERNEL);
 185         if (!buffer)
 186                 return -ENOMEM;
 187
 188         r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x0706, 0, buffer, size);
 189         if (r < 0)
 190                 goto out;
 191
 192         /* setup the private status if available */
 193         if (r == 2) {
 194                 r = 0;
 195                 spin_lock_irqsave(&priv->lock, flags);
 196                 priv->line_status = (~(*buffer)) & CH341_BITS_MODEM_STAT;
 197                 priv->multi_status_change = 0;
 198                 spin_unlock_irqrestore(&priv->lock, flags);
 199         } else
 200                 r = -EPROTO;
 201
 202 out:    kfree(buffer);
 203         return r;
 204 }
 205
 206 /* -------------------------------------------------------------------------- */
 207
 208 static int ch341_configure(struct usb_device *dev, struct ch341_private *priv)
 209 {
 210         char *buffer;
 211         int r;
 212         const unsigned size = 8;
 213
 214         dbg("ch341_configure()");
 215
 216         buffer = kmalloc(size, GFP_KERNEL);
 217         if (!buffer)
 218                 return -ENOMEM;
 219
 220         /* expect two bytes 0x27 0x00 */
 221         r = ch341_control_in(dev, CH341_REQ_READ_VERSION, 0, 0, buffer, size);
 222         if (r < 0)
 223                 goto out;
 224
 225         r = ch341_control_out(dev, CH341_REQ_SERIAL_INIT, 0, 0);
 226         if (r < 0)
 227                 goto out;
 228
 229         /* expect two bytes 0x56 0x00 */
 230         r = ch341_control_in(dev, CH341_REQ_READ_REG, 0x2518, 0, buffer, size);
 231         if (r < 0)
 232                 goto out;
 233
 234         r = ch341_control_out(dev, CH341_REQ_WRITE_REG, 0x2518, 0x0050);
 235         if (r < 0)
 236                 goto out;
 237
 238         /* expect 0xff 0xee */
 239         r = ch341_get_status(dev, priv);
 240         if (r < 0)
 241                 goto out;
 242
 243         r = ch341_init_set_baudrate(dev, priv, 0);
 244         if (r < 0)
 245                 goto out;
 246
 247         r = ch341_set_handshake(dev, priv->line_control);
 248         if (r < 0)
 249                 goto out;
 250
 251         /* expect 0x9f 0xee */
 252         r = ch341_get_status(dev, priv);
 253
 254 out:    kfree(buffer);
 255         return r;
 256 }
 257
 258 /* allocate private data */
 259 static int ch341_attach(struct usb_serial *serial)
 260 {
 261         struct ch341_private *priv;
 262         int r;
 263
 264         dbg("ch341_attach()");
 265
 266         /* private data */
 267         priv = kzalloc(sizeof(struct ch341_private), GFP_KERNEL);
 268         if (!priv)
 269                 return -ENOMEM;
 270
 271         spin_lock_init(&priv->lock);
 272         priv->baud_rate = DEFAULT_BAUD_RATE;
 273         priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR;
 274
 275         r = ch341_configure(serial->dev, priv);
 276         if (r < 0)
 277                 goto error;
 278
 279         usb_set_serial_port_data(serial->port[0], priv);
 280         return 0;
 281
 282 error:  kfree(priv);
 283         return r;
 284 }
 285
 286 static int ch341_carrier_raised(struct usb_serial_port *port)
 287 {
 288         struct ch341_private *priv = usb_get_serial_port_data(port);
 289         if (priv->line_status & CH341_BIT_DCD)
 290                 return 1;
 291         return 0;
 292 }
 293
 294 static void ch341_dtr_rts(struct usb_serial_port *port, int on)
 295 {
 296         struct ch341_private *priv = usb_get_serial_port_data(port);
 297         unsigned long flags;
 298
 299         dbg("%s - port %d", __func__, port->number);
 300         /* drop DTR and RTS */
 301         spin_lock_irqsave(&priv->lock, flags);
 302         if (on)
 303                 priv->line_control |= CH341_BIT_RTS | CH341_BIT_DTR;
 304         else
 305                 priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR);
 306         spin_unlock_irqrestore(&priv->lock, flags);
 307         ch341_set_handshake(port->serial->dev, priv->line_control);
 308         wake_up_interruptible(&port->delta_msr_wait);
 309 }
 310
 311 static void ch341_close(struct usb_serial_port *port)
 312 {
 313         dbg("%s - port %d", __func__, port->number);
 314
 315         usb_serial_generic_close(port);
 316         usb_kill_urb(port->interrupt_in_urb);
 317 }
 318
 319
 320 /* open this device, set default parameters */
 321 static int ch341_open(struct tty_struct *tty, struct usb_serial_port *port)
 322 {
 323         struct usb_serial *serial = port->serial;
 324         struct ch341_private *priv = usb_get_serial_port_data(serial->port[0]);
 325         int r;
 326
 327         dbg("ch341_open()");
 328
 329         r = ch341_configure(serial->dev, priv);
 330         if (r)
 331                 goto out;
 332
 333         if (tty)
 334                 ch341_set_termios(tty, port, NULL);
 335
 336         dbg("%s - submitting interrupt urb", __func__);
 337         port->interrupt_in_urb->dev = serial->dev;
 338         r = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 339         if (r) {
 340                 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
 341                         " error %d\n", __func__, r);
 342                 goto out;
 343         }
 344
 345         r = usb_serial_generic_open(tty, port);
 346
 347 out:    return r;
 348 }
 349
 350 /* Old_termios contains the original termios settings and
 351  * tty->termios contains the new setting to be used.
 352  */
 353 static void ch341_set_termios(struct tty_struct *tty,
 354                 struct usb_serial_port *port, struct ktermios *old_termios)
 355 {
 356         struct ch341_private *priv = usb_get_serial_port_data(port);
 357         unsigned baud_rate;
 358         unsigned long flags;
 359         unsigned char ctrl;
 360         int r;
 361
 362         /* redundant changes may cause the chip to lose bytes */
 363         if (old_termios && !tty_termios_hw_change(tty->termios, old_termios))
 364                 return;
 365
 366         dbg("ch341_set_termios()");
 367
 368         baud_rate = tty_get_baud_rate(tty);
 369
 370         priv->baud_rate = baud_rate;
 371
 372         ctrl = CH341_LCR_ENABLE_RX | CH341_LCR_ENABLE_TX | CH341_LCR_CS8;
 373
 374         if (baud_rate) {
 375                 spin_lock_irqsave(&priv->lock, flags);
 376                 priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS);
 377                 spin_unlock_irqrestore(&priv->lock, flags);
 378                 r = ch341_init_set_baudrate(port->serial->dev, priv, ctrl);
 379                 if (r < 0 && old_termios) {
 380                         priv->baud_rate = tty_termios_baud_rate(old_termios);
 381                         tty_termios_copy_hw(tty->termios, old_termios);
 382                 }
 383         } else {
 384                 spin_lock_irqsave(&priv->lock, flags);
 385                 priv->line_control &= ~(CH341_BIT_DTR | CH341_BIT_RTS);
 386                 spin_unlock_irqrestore(&priv->lock, flags);
 387         }
 388
 389         ch341_set_handshake(port->serial->dev, priv->line_control);
 390
 391         /* Unimplemented:
 392          * (cflag & CSIZE) : data bits [5, 8]
 393          * (cflag & PARENB) : parity {NONE, EVEN, ODD}
 394          * (cflag & CSTOPB) : stop bits [1, 2]
 395          */
 396 }
 397
 398 static void ch341_break_ctl(struct tty_struct *tty, int break_state)
 399 {
 400         const uint16_t ch341_break_reg =
 401                         ((uint16_t) CH341_REG_LCR << 8) | CH341_REG_BREAK;
 402         struct usb_serial_port *port = tty->driver_data;
 403         int r;
 404         uint16_t reg_contents;
 405         uint8_t *break_reg;
 406
 407         dbg("%s()", __func__);
 408
 409         break_reg = kmalloc(2, GFP_KERNEL);
 410         if (!break_reg) {
 411                 dev_err(&port->dev, "%s - kmalloc failed\n", __func__);
 412                 return;
 413         }
 414
 415         r = ch341_control_in(port->serial->dev, CH341_REQ_READ_REG,
 416                         ch341_break_reg, 0, break_reg, 2);
 417         if (r < 0) {
 418                 dev_err(&port->dev, "%s - USB control read error (%d)\n",
 419                                 __func__, r);
 420                 goto out;
 421         }
 422         dbg("%s - initial ch341 break register contents - reg1: %x, reg2: %x",
 423                         __func__, break_reg[0], break_reg[1]);
 424         if (break_state != 0) {
 425                 dbg("%s - Enter break state requested", __func__);
 426                 break_reg[0] &= ~CH341_NBREAK_BITS;
 427                 break_reg[1] &= ~CH341_LCR_ENABLE_TX;
 428         } else {
 429                 dbg("%s - Leave break state requested", __func__);
 430                 break_reg[0] |= CH341_NBREAK_BITS;
 431                 break_reg[1] |= CH341_LCR_ENABLE_TX;
 432         }
 433         dbg("%s - New ch341 break register contents - reg1: %x, reg2: %x",
 434                         __func__, break_reg[0], break_reg[1]);
 435         reg_contents = get_unaligned_le16(break_reg);
 436         r = ch341_control_out(port->serial->dev, CH341_REQ_WRITE_REG,
 437                         ch341_break_reg, reg_contents);
 438         if (r < 0)
 439                 dev_err(&port->dev, "%s - USB control write error (%d)\n",
 440                                 __func__, r);
 441 out:
 442         kfree(break_reg);
 443 }
 444
 445 static int ch341_tiocmset(struct tty_struct *tty,
 446                           unsigned int set, unsigned int clear)
 447 {
 448         struct usb_serial_port *port = tty->driver_data;
 449         struct ch341_private *priv = usb_get_serial_port_data(port);
 450         unsigned long flags;
 451         u8 control;
 452
 453         spin_lock_irqsave(&priv->lock, flags);
 454         if (set & TIOCM_RTS)
 455                 priv->line_control |= CH341_BIT_RTS;
 456         if (set & TIOCM_DTR)
 457                 priv->line_control |= CH341_BIT_DTR;
 458         if (clear & TIOCM_RTS)
 459                 priv->line_control &= ~CH341_BIT_RTS;
 460         if (clear & TIOCM_DTR)
 461                 priv->line_control &= ~CH341_BIT_DTR;
 462         control = priv->line_control;
 463         spin_unlock_irqrestore(&priv->lock, flags);
 464
 465         return ch341_set_handshake(port->serial->dev, control);
 466 }
 467
 468 static void ch341_read_int_callback(struct urb *urb)
 469 {
 470         struct usb_serial_port *port = (struct usb_serial_port *) urb->context;
 471         unsigned char *data = urb->transfer_buffer;
 472         unsigned int actual_length = urb->actual_length;
 473         int status;
 474
 475         dbg("%s (%d)", __func__, port->number);
 476
 477         switch (urb->status) {
 478         case 0:
 479                 /* success */
 480                 break;
 481         case -ECONNRESET:
 482         case -ENOENT:
 483         case -ESHUTDOWN:
 484                 /* this urb is terminated, clean up */
 485                 dbg("%s - urb shutting down with status: %d", __func__,
 486                     urb->status);
 487                 return;
 488         default:
 489                 dbg("%s - nonzero urb status received: %d", __func__,
 490                     urb->status);
 491                 goto exit;
 492         }
 493
 494         usb_serial_debug_data(debug, &port->dev, __func__,
 495                               urb->actual_length, urb->transfer_buffer);
 496
 497         if (actual_length >= 4) {
 498                 struct ch341_private *priv = usb_get_serial_port_data(port);
 499                 unsigned long flags;
 500                 u8 prev_line_status = priv->line_status;
 501
 502                 spin_lock_irqsave(&priv->lock, flags);
 503                 priv->line_status = (~(data[2])) & CH341_BITS_MODEM_STAT;
 504                 if ((data[1] & CH341_MULT_STAT))
 505                         priv->multi_status_change = 1;
 506                 spin_unlock_irqrestore(&priv->lock, flags);
 507
 508                 if ((priv->line_status ^ prev_line_status) & CH341_BIT_DCD) {
 509                         struct tty_struct *tty = tty_port_tty_get(&port->port);
 510                         if (tty)
 511                                 usb_serial_handle_dcd_change(port, tty,
 512                                             priv->line_status & CH341_BIT_DCD);
 513                         tty_kref_put(tty);
 514                 }
 515
 516                 wake_up_interruptible(&port->delta_msr_wait);
 517         }
 518
 519 exit:
 520         status = usb_submit_urb(urb, GFP_ATOMIC);
 521         if (status)
 522                 dev_err(&urb->dev->dev,
 523                         "%s - usb_submit_urb failed with result %d\n",
 524                         __func__, status);
 525 }
 526
 527 static int wait_modem_info(struct usb_serial_port *port, unsigned int arg)
 528 {
 529         struct ch341_private *priv = usb_get_serial_port_data(port);
 530         unsigned long flags;
 531         u8 prevstatus;
 532         u8 status;
 533         u8 changed;
 534         u8 multi_change = 0;
 535
 536         spin_lock_irqsave(&priv->lock, flags);
 537         prevstatus = priv->line_status;
 538         priv->multi_status_change = 0;
 539         spin_unlock_irqrestore(&priv->lock, flags);
 540
 541         while (!multi_change) {
 542                 interruptible_sleep_on(&port->delta_msr_wait);
 543                 /* see if a signal did it */
 544                 if (signal_pending(current))
 545                         return -ERESTARTSYS;
 546
 547                 if (port->serial->disconnected)
 548                         return -EIO;
 549
 550                 spin_lock_irqsave(&priv->lock, flags);
 551                 status = priv->line_status;
 552                 multi_change = priv->multi_status_change;
 553                 spin_unlock_irqrestore(&priv->lock, flags);
 554
 555                 changed = prevstatus ^ status;
 556
 557                 if (((arg & TIOCM_RNG) && (changed & CH341_BIT_RI)) ||
 558                     ((arg & TIOCM_DSR) && (changed & CH341_BIT_DSR)) ||
 559                     ((arg & TIOCM_CD)  && (changed & CH341_BIT_DCD)) ||
 560                     ((arg & TIOCM_CTS) && (changed & CH341_BIT_CTS))) {
 561                         return 0;
 562                 }
 563                 prevstatus = status;
 564         }
 565
 566         return 0;
 567 }
 568
 569 static int ch341_ioctl(struct tty_struct *tty,
 570                         unsigned int cmd, unsigned long arg)
 571 {
 572         struct usb_serial_port *port = tty->driver_data;
 573         dbg("%s (%d) cmd = 0x%04x", __func__, port->number, cmd);
 574
 575         switch (cmd) {
 576         case TIOCMIWAIT:
 577                 dbg("%s (%d) TIOCMIWAIT", __func__,  port->number);
 578                 return wait_modem_info(port, arg);
 579
 580         default:
 581                 dbg("%s not supported = 0x%04x", __func__, cmd);
 582                 break;
 583         }
 584
 585         return -ENOIOCTLCMD;
 586 }
 587
 588 static int ch341_tiocmget(struct tty_struct *tty)
 589 {
 590         struct usb_serial_port *port = tty->driver_data;
 591         struct ch341_private *priv = usb_get_serial_port_data(port);
 592         unsigned long flags;
 593         u8 mcr;
 594         u8 status;
 595         unsigned int result;
 596
 597         dbg("%s (%d)", __func__, port->number);
 598
 599         spin_lock_irqsave(&priv->lock, flags);
 600         mcr = priv->line_control;
 601         status = priv->line_status;
 602         spin_unlock_irqrestore(&priv->lock, flags);
 603
 604         result = ((mcr & CH341_BIT_DTR)         ? TIOCM_DTR : 0)
 605                   | ((mcr & CH341_BIT_RTS)      ? TIOCM_RTS : 0)
 606                   | ((status & CH341_BIT_CTS)   ? TIOCM_CTS : 0)
 607                   | ((status & CH341_BIT_DSR)   ? TIOCM_DSR : 0)
 608                   | ((status & CH341_BIT_RI)    ? TIOCM_RI  : 0)
 609                   | ((status & CH341_BIT_DCD)   ? TIOCM_CD  : 0);
 610
 611         dbg("%s - result = %x", __func__, result);
 612
 613         return result;
 614 }
 615
 616
 617 static int ch341_reset_resume(struct usb_interface *intf)
 618 {
 619         struct usb_device *dev = interface_to_usbdev(intf);
 620         struct usb_serial *serial = NULL;
 621         struct ch341_private *priv;
 622
 623         serial = usb_get_intfdata(intf);
 624         priv = usb_get_serial_port_data(serial->port[0]);
 625
 626         /*reconfigure ch341 serial port after bus-reset*/
 627         ch341_configure(dev, priv);
 628
 629         usb_serial_resume(intf);
 630
 631         return 0;
 632 }
 633
 634 static struct usb_driver ch341_driver = {
 635         .name           = "ch341",
 636         .probe          = usb_serial_probe,
 637         .disconnect     = usb_serial_disconnect,
 638         .suspend        = usb_serial_suspend,
 639         .resume         = usb_serial_resume,
 640         .reset_resume   = ch341_reset_resume,
 641         .id_table       = id_table,
 642         .no_dynamic_id  = 1,
 643         .supports_autosuspend = 1,
 644 };
 645
 646 static struct usb_serial_driver ch341_device = {
 647         .driver = {
 648                 .owner  = THIS_MODULE,
 649                 .name   = "ch341-uart",
 650         },
 651         .id_table          = id_table,
 652         .usb_driver        = &ch341_driver,
 653         .num_ports         = 1,
 654         .open              = ch341_open,
 655         .dtr_rts           = ch341_dtr_rts,
 656         .carrier_raised    = ch341_carrier_raised,
 657         .close             = ch341_close,
 658         .ioctl             = ch341_ioctl,
 659         .set_termios       = ch341_set_termios,
 660         .break_ctl         = ch341_break_ctl,
 661         .tiocmget          = ch341_tiocmget,
 662         .tiocmset          = ch341_tiocmset,
 663         .read_int_callback = ch341_read_int_callback,
 664         .attach            = ch341_attach,
 665 };
 666
 667 static int __init ch341_init(void)
 668 {
 669         int retval;
 670
 671         retval = usb_serial_register(&ch341_device);
 672         if (retval)
 673                 return retval;
 674         retval = usb_register(&ch341_driver);
 675         if (retval)
 676                 usb_serial_deregister(&ch341_device);
 677         return retval;
 678 }
 679
 680 static void __exit ch341_exit(void)
 681 {
 682         usb_deregister(&ch341_driver);
 683         usb_serial_deregister(&ch341_device);
 684 }
 685
 686 module_init(ch341_init);
 687 module_exit(ch341_exit);
 688 MODULE_LICENSE("GPL");
 689
 690 module_param(debug, bool, S_IRUGO | S_IWUSR);
 691 MODULE_PARM_DESC(debug, "Debug enabled or not");
 692
 693 /* EOF ch341.c */