drivers/usb/serial/f81232.c

   1 /*
   2  * Fintek F81232 USB to serial adaptor driver
   3  *
   4  * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
   5  * Copyright (C) 2012 Linux Foundation
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License version 2 as published by
   9  * the Free Software Foundation.
  10  *
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/errno.h>
  15 #include <linux/slab.h>
  16 #include <linux/tty.h>
  17 #include <linux/tty_driver.h>
  18 #include <linux/tty_flip.h>
  19 #include <linux/serial.h>
  20 #include <linux/module.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/mutex.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/serial.h>
  26 #include <linux/serial_reg.h>
  27
  28 static const struct usb_device_id id_table[] = {
  29         { USB_DEVICE(0x1934, 0x0706) },
  30         { }                                     /* Terminating entry */
  31 };
  32 MODULE_DEVICE_TABLE(usb, id_table);
  33
  34 /* Maximum baudrate for F81232 */
  35 #define F81232_MAX_BAUDRATE             115200
  36
  37 /* USB Control EP parameter */
  38 #define F81232_REGISTER_REQUEST         0xa0
  39 #define F81232_GET_REGISTER             0xc0
  40 #define F81232_SET_REGISTER             0x40
  41
  42 #define SERIAL_BASE_ADDRESS             0x0120
  43 #define RECEIVE_BUFFER_REGISTER         (0x00 + SERIAL_BASE_ADDRESS)
  44 #define INTERRUPT_ENABLE_REGISTER       (0x01 + SERIAL_BASE_ADDRESS)
  45 #define FIFO_CONTROL_REGISTER           (0x02 + SERIAL_BASE_ADDRESS)
  46 #define LINE_CONTROL_REGISTER           (0x03 + SERIAL_BASE_ADDRESS)
  47 #define MODEM_CONTROL_REGISTER          (0x04 + SERIAL_BASE_ADDRESS)
  48 #define MODEM_STATUS_REGISTER           (0x06 + SERIAL_BASE_ADDRESS)
  49
  50 struct f81232_private {
  51         struct mutex lock;
  52         u8 modem_control;
  53         u8 modem_status;
  54         struct work_struct interrupt_work;
  55         struct usb_serial_port *port;
  56 };
  57
  58 static int calc_baud_divisor(speed_t baudrate)
  59 {
  60         return DIV_ROUND_CLOSEST(F81232_MAX_BAUDRATE, baudrate);
  61 }
  62
  63 static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
  64 {
  65         int status;
  66         u8 *tmp;
  67         struct usb_device *dev = port->serial->dev;
  68
  69         tmp = kmalloc(sizeof(*val), GFP_KERNEL);
  70         if (!tmp)
  71                 return -ENOMEM;
  72
  73         status = usb_control_msg(dev,
  74                                 usb_rcvctrlpipe(dev, 0),
  75                                 F81232_REGISTER_REQUEST,
  76                                 F81232_GET_REGISTER,
  77                                 reg,
  78                                 0,
  79                                 tmp,
  80                                 sizeof(*val),
  81                                 USB_CTRL_GET_TIMEOUT);
  82         if (status != sizeof(*val)) {
  83                 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
  84
  85                 if (status < 0)
  86                         status = usb_translate_errors(status);
  87                 else
  88                         status = -EIO;
  89         } else {
  90                 status = 0;
  91                 *val = *tmp;
  92         }
  93
  94         kfree(tmp);
  95         return status;
  96 }
  97
  98 static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
  99 {
 100         int status;
 101         u8 *tmp;
 102         struct usb_device *dev = port->serial->dev;
 103
 104         tmp = kmalloc(sizeof(val), GFP_KERNEL);
 105         if (!tmp)
 106                 return -ENOMEM;
 107
 108         *tmp = val;
 109
 110         status = usb_control_msg(dev,
 111                                 usb_sndctrlpipe(dev, 0),
 112                                 F81232_REGISTER_REQUEST,
 113                                 F81232_SET_REGISTER,
 114                                 reg,
 115                                 0,
 116                                 tmp,
 117                                 sizeof(val),
 118                                 USB_CTRL_SET_TIMEOUT);
 119         if (status != sizeof(val)) {
 120                 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
 121
 122                 if (status < 0)
 123                         status = usb_translate_errors(status);
 124                 else
 125                         status = -EIO;
 126         } else {
 127                 status = 0;
 128         }
 129
 130         kfree(tmp);
 131         return status;
 132 }
 133
 134 static void f81232_read_msr(struct usb_serial_port *port)
 135 {
 136         int status;
 137         u8 current_msr;
 138         struct tty_struct *tty;
 139         struct f81232_private *priv = usb_get_serial_port_data(port);
 140
 141         mutex_lock(&priv->lock);
 142         status = f81232_get_register(port, MODEM_STATUS_REGISTER,
 143                         &current_msr);
 144         if (status) {
 145                 dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
 146                 mutex_unlock(&priv->lock);
 147                 return;
 148         }
 149
 150         if (!(current_msr & UART_MSR_ANY_DELTA)) {
 151                 mutex_unlock(&priv->lock);
 152                 return;
 153         }
 154
 155         priv->modem_status = current_msr;
 156
 157         if (current_msr & UART_MSR_DCTS)
 158                 port->icount.cts++;
 159         if (current_msr & UART_MSR_DDSR)
 160                 port->icount.dsr++;
 161         if (current_msr & UART_MSR_TERI)
 162                 port->icount.rng++;
 163         if (current_msr & UART_MSR_DDCD) {
 164                 port->icount.dcd++;
 165                 tty = tty_port_tty_get(&port->port);
 166                 if (tty) {
 167                         usb_serial_handle_dcd_change(port, tty,
 168                                         current_msr & UART_MSR_DCD);
 169
 170                         tty_kref_put(tty);
 171                 }
 172         }
 173
 174         wake_up_interruptible(&port->port.delta_msr_wait);
 175         mutex_unlock(&priv->lock);
 176 }
 177
 178 static int f81232_set_mctrl(struct usb_serial_port *port,
 179                                            unsigned int set, unsigned int clear)
 180 {
 181         u8 val;
 182         int status;
 183         struct f81232_private *priv = usb_get_serial_port_data(port);
 184
 185         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
 186                 return 0;       /* no change */
 187
 188         /* 'set' takes precedence over 'clear' */
 189         clear &= ~set;
 190
 191         /* force enable interrupt with OUT2 */
 192         mutex_lock(&priv->lock);
 193         val = UART_MCR_OUT2 | priv->modem_control;
 194
 195         if (clear & TIOCM_DTR)
 196                 val &= ~UART_MCR_DTR;
 197
 198         if (clear & TIOCM_RTS)
 199                 val &= ~UART_MCR_RTS;
 200
 201         if (set & TIOCM_DTR)
 202                 val |= UART_MCR_DTR;
 203
 204         if (set & TIOCM_RTS)
 205                 val |= UART_MCR_RTS;
 206
 207         dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
 208                         val, priv->modem_control);
 209
 210         status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
 211         if (status) {
 212                 dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
 213                 mutex_unlock(&priv->lock);
 214                 return status;
 215         }
 216
 217         priv->modem_control = val;
 218         mutex_unlock(&priv->lock);
 219
 220         return 0;
 221 }
 222
 223 static void f81232_update_line_status(struct usb_serial_port *port,
 224                                       unsigned char *data,
 225                                       size_t actual_length)
 226 {
 227         struct f81232_private *priv = usb_get_serial_port_data(port);
 228
 229         if (!actual_length)
 230                 return;
 231
 232         switch (data[0] & 0x07) {
 233         case 0x00: /* msr change */
 234                 dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
 235                 schedule_work(&priv->interrupt_work);
 236                 break;
 237         case 0x02: /* tx-empty */
 238                 break;
 239         case 0x04: /* rx data available */
 240                 break;
 241         case 0x06: /* lsr change */
 242                 /* we can forget it. the LSR will read from bulk-in */
 243                 dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
 244                 break;
 245         }
 246 }
 247
 248 static void f81232_read_int_callback(struct urb *urb)
 249 {
 250         struct usb_serial_port *port =  urb->context;
 251         unsigned char *data = urb->transfer_buffer;
 252         unsigned int actual_length = urb->actual_length;
 253         int status = urb->status;
 254         int retval;
 255
 256         switch (status) {
 257         case 0:
 258                 /* success */
 259                 break;
 260         case -ECONNRESET:
 261         case -ENOENT:
 262         case -ESHUTDOWN:
 263                 /* this urb is terminated, clean up */
 264                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
 265                         __func__, status);
 266                 return;
 267         default:
 268                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
 269                         __func__, status);
 270                 goto exit;
 271         }
 272
 273         usb_serial_debug_data(&port->dev, __func__,
 274                               urb->actual_length, urb->transfer_buffer);
 275
 276         f81232_update_line_status(port, data, actual_length);
 277
 278 exit:
 279         retval = usb_submit_urb(urb, GFP_ATOMIC);
 280         if (retval)
 281                 dev_err(&urb->dev->dev,
 282                         "%s - usb_submit_urb failed with result %d\n",
 283                         __func__, retval);
 284 }
 285
 286 static void f81232_process_read_urb(struct urb *urb)
 287 {
 288         struct usb_serial_port *port = urb->context;
 289         unsigned char *data = urb->transfer_buffer;
 290         char tty_flag;
 291         unsigned int i;
 292         u8 lsr;
 293
 294         /*
 295          * When opening the port we get a 1-byte packet with the current LSR,
 296          * which we discard.
 297          */
 298         if ((urb->actual_length < 2) || (urb->actual_length % 2))
 299                 return;
 300
 301         /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
 302
 303         for (i = 0; i < urb->actual_length; i += 2) {
 304                 tty_flag = TTY_NORMAL;
 305                 lsr = data[i];
 306
 307                 if (lsr & UART_LSR_BRK_ERROR_BITS) {
 308                         if (lsr & UART_LSR_BI) {
 309                                 tty_flag = TTY_BREAK;
 310                                 port->icount.brk++;
 311                                 usb_serial_handle_break(port);
 312                         } else if (lsr & UART_LSR_PE) {
 313                                 tty_flag = TTY_PARITY;
 314                                 port->icount.parity++;
 315                         } else if (lsr & UART_LSR_FE) {
 316                                 tty_flag = TTY_FRAME;
 317                                 port->icount.frame++;
 318                         }
 319
 320                         if (lsr & UART_LSR_OE) {
 321                                 port->icount.overrun++;
 322                                 tty_insert_flip_char(&port->port, 0,
 323                                                 TTY_OVERRUN);
 324                         }
 325                 }
 326
 327                 if (port->port.console && port->sysrq) {
 328                         if (usb_serial_handle_sysrq_char(port, data[i + 1]))
 329                                 continue;
 330                 }
 331
 332                 tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
 333         }
 334
 335         tty_flip_buffer_push(&port->port);
 336 }
 337
 338 static void f81232_break_ctl(struct tty_struct *tty, int break_state)
 339 {
 340         /* FIXME - Stubbed out for now */
 341
 342         /*
 343          * break_state = -1 to turn on break, and 0 to turn off break
 344          * see drivers/char/tty_io.c to see it used.
 345          * last_set_data_urb_value NEVER has the break bit set in it.
 346          */
 347 }
 348
 349 static void f81232_set_baudrate(struct usb_serial_port *port, speed_t baudrate)
 350 {
 351         u8 lcr;
 352         int divisor;
 353         int status = 0;
 354
 355         divisor = calc_baud_divisor(baudrate);
 356
 357         status = f81232_get_register(port, LINE_CONTROL_REGISTER,
 358                          &lcr); /* get LCR */
 359         if (status) {
 360                 dev_err(&port->dev, "%s failed to get LCR: %d\n",
 361                         __func__, status);
 362                 return;
 363         }
 364
 365         status = f81232_set_register(port, LINE_CONTROL_REGISTER,
 366                          lcr | UART_LCR_DLAB); /* Enable DLAB */
 367         if (status) {
 368                 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
 369                         __func__, status);
 370                 return;
 371         }
 372
 373         status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
 374                          divisor & 0x00ff); /* low */
 375         if (status) {
 376                 dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
 377                         __func__, status);
 378                 goto reapply_lcr;
 379         }
 380
 381         status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
 382                          (divisor & 0xff00) >> 8); /* high */
 383         if (status) {
 384                 dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
 385                         __func__, status);
 386         }
 387
 388 reapply_lcr:
 389         status = f81232_set_register(port, LINE_CONTROL_REGISTER,
 390                         lcr & ~UART_LCR_DLAB);
 391         if (status) {
 392                 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
 393                         __func__, status);
 394         }
 395 }
 396
 397 static int f81232_port_enable(struct usb_serial_port *port)
 398 {
 399         u8 val;
 400         int status;
 401
 402         /* fifo on, trigger8, clear TX/RX*/
 403         val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
 404                         UART_FCR_CLEAR_XMIT;
 405
 406         status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
 407         if (status) {
 408                 dev_err(&port->dev, "%s failed to set FCR: %d\n",
 409                         __func__, status);
 410                 return status;
 411         }
 412
 413         /* MSR Interrupt only, LSR will read from Bulk-in odd byte */
 414         status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
 415                         UART_IER_MSI);
 416         if (status) {
 417                 dev_err(&port->dev, "%s failed to set IER: %d\n",
 418                         __func__, status);
 419                 return status;
 420         }
 421
 422         return 0;
 423 }
 424
 425 static int f81232_port_disable(struct usb_serial_port *port)
 426 {
 427         int status;
 428
 429         status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
 430         if (status) {
 431                 dev_err(&port->dev, "%s failed to set IER: %d\n",
 432                         __func__, status);
 433                 return status;
 434         }
 435
 436         return 0;
 437 }
 438
 439 static void f81232_set_termios(struct tty_struct *tty,
 440                 struct usb_serial_port *port, struct ktermios *old_termios)
 441 {
 442         u8 new_lcr = 0;
 443         int status = 0;
 444         speed_t baudrate;
 445
 446         /* Don't change anything if nothing has changed */
 447         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
 448                 return;
 449
 450         if (C_BAUD(tty) == B0)
 451                 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
 452         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 453                 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
 454
 455         baudrate = tty_get_baud_rate(tty);
 456         if (baudrate > 0) {
 457                 if (baudrate > F81232_MAX_BAUDRATE) {
 458                         baudrate = F81232_MAX_BAUDRATE;
 459                         tty_encode_baud_rate(tty, baudrate, baudrate);
 460                 }
 461                 f81232_set_baudrate(port, baudrate);
 462         }
 463
 464         if (C_PARENB(tty)) {
 465                 new_lcr |= UART_LCR_PARITY;
 466
 467                 if (!C_PARODD(tty))
 468                         new_lcr |= UART_LCR_EPAR;
 469
 470                 if (C_CMSPAR(tty))
 471                         new_lcr |= UART_LCR_SPAR;
 472         }
 473
 474         if (C_CSTOPB(tty))
 475                 new_lcr |= UART_LCR_STOP;
 476
 477         switch (C_CSIZE(tty)) {
 478         case CS5:
 479                 new_lcr |= UART_LCR_WLEN5;
 480                 break;
 481         case CS6:
 482                 new_lcr |= UART_LCR_WLEN6;
 483                 break;
 484         case CS7:
 485                 new_lcr |= UART_LCR_WLEN7;
 486                 break;
 487         default:
 488         case CS8:
 489                 new_lcr |= UART_LCR_WLEN8;
 490                 break;
 491         }
 492
 493         status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
 494         if (status) {
 495                 dev_err(&port->dev, "%s failed to set LCR: %d\n",
 496                         __func__, status);
 497         }
 498 }
 499
 500 static int f81232_tiocmget(struct tty_struct *tty)
 501 {
 502         int r;
 503         struct usb_serial_port *port = tty->driver_data;
 504         struct f81232_private *port_priv = usb_get_serial_port_data(port);
 505         u8 mcr, msr;
 506
 507         /* force get current MSR changed state */
 508         f81232_read_msr(port);
 509
 510         mutex_lock(&port_priv->lock);
 511         mcr = port_priv->modem_control;
 512         msr = port_priv->modem_status;
 513         mutex_unlock(&port_priv->lock);
 514
 515         r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
 516                 (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
 517                 (msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
 518                 (msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
 519                 (msr & UART_MSR_RI ? TIOCM_RI : 0) |
 520                 (msr & UART_MSR_DSR ? TIOCM_DSR : 0);
 521
 522         return r;
 523 }
 524
 525 static int f81232_tiocmset(struct tty_struct *tty,
 526                         unsigned int set, unsigned int clear)
 527 {
 528         struct usb_serial_port *port = tty->driver_data;
 529
 530         return f81232_set_mctrl(port, set, clear);
 531 }
 532
 533 static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
 534 {
 535         int result;
 536
 537         result = f81232_port_enable(port);
 538         if (result)
 539                 return result;
 540
 541         /* Setup termios */
 542         if (tty)
 543                 f81232_set_termios(tty, port, NULL);
 544
 545         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 546         if (result) {
 547                 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
 548                         " error %d\n", __func__, result);
 549                 return result;
 550         }
 551
 552         result = usb_serial_generic_open(tty, port);
 553         if (result) {
 554                 usb_kill_urb(port->interrupt_in_urb);
 555                 return result;
 556         }
 557
 558         return 0;
 559 }
 560
 561 static void f81232_close(struct usb_serial_port *port)
 562 {
 563         f81232_port_disable(port);
 564         usb_serial_generic_close(port);
 565         usb_kill_urb(port->interrupt_in_urb);
 566 }
 567
 568 static void f81232_dtr_rts(struct usb_serial_port *port, int on)
 569 {
 570         if (on)
 571                 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
 572         else
 573                 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
 574 }
 575
 576 static int f81232_carrier_raised(struct usb_serial_port *port)
 577 {
 578         u8 msr;
 579         struct f81232_private *priv = usb_get_serial_port_data(port);
 580
 581         mutex_lock(&priv->lock);
 582         msr = priv->modem_status;
 583         mutex_unlock(&priv->lock);
 584
 585         if (msr & UART_MSR_DCD)
 586                 return 1;
 587         return 0;
 588 }
 589
 590 static int f81232_get_serial_info(struct usb_serial_port *port,
 591                 unsigned long arg)
 592 {
 593         struct serial_struct ser;
 594
 595         memset(&ser, 0, sizeof(ser));
 596
 597         ser.type = PORT_16550A;
 598         ser.line = port->minor;
 599         ser.port = port->port_number;
 600         ser.baud_base = F81232_MAX_BAUDRATE;
 601
 602         if (copy_to_user((void __user *)arg, &ser, sizeof(ser)))
 603                 return -EFAULT;
 604
 605         return 0;
 606 }
 607
 608 static int f81232_ioctl(struct tty_struct *tty,
 609                         unsigned int cmd, unsigned long arg)
 610 {
 611         struct usb_serial_port *port = tty->driver_data;
 612
 613         switch (cmd) {
 614         case TIOCGSERIAL:
 615                 return f81232_get_serial_info(port, arg);
 616         default:
 617                 break;
 618         }
 619         return -ENOIOCTLCMD;
 620 }
 621
 622 static void  f81232_interrupt_work(struct work_struct *work)
 623 {
 624         struct f81232_private *priv =
 625                 container_of(work, struct f81232_private, interrupt_work);
 626
 627         f81232_read_msr(priv->port);
 628 }
 629
 630 static int f81232_port_probe(struct usb_serial_port *port)
 631 {
 632         struct f81232_private *priv;
 633
 634         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 635         if (!priv)
 636                 return -ENOMEM;
 637
 638         mutex_init(&priv->lock);
 639         INIT_WORK(&priv->interrupt_work,  f81232_interrupt_work);
 640
 641         usb_set_serial_port_data(port, priv);
 642
 643         port->port.drain_delay = 256;
 644         priv->port = port;
 645
 646         return 0;
 647 }
 648
 649 static int f81232_port_remove(struct usb_serial_port *port)
 650 {
 651         struct f81232_private *priv;
 652
 653         priv = usb_get_serial_port_data(port);
 654         kfree(priv);
 655
 656         return 0;
 657 }
 658
 659 static struct usb_serial_driver f81232_device = {
 660         .driver = {
 661                 .owner =        THIS_MODULE,
 662                 .name =         "f81232",
 663         },
 664         .id_table =             id_table,
 665         .num_ports =            1,
 666         .bulk_in_size =         256,
 667         .bulk_out_size =        256,
 668         .open =                 f81232_open,
 669         .close =                f81232_close,
 670         .dtr_rts =              f81232_dtr_rts,
 671         .carrier_raised =       f81232_carrier_raised,
 672         .ioctl =                f81232_ioctl,
 673         .break_ctl =            f81232_break_ctl,
 674         .set_termios =          f81232_set_termios,
 675         .tiocmget =             f81232_tiocmget,
 676         .tiocmset =             f81232_tiocmset,
 677         .tiocmiwait =           usb_serial_generic_tiocmiwait,
 678         .process_read_urb =     f81232_process_read_urb,
 679         .read_int_callback =    f81232_read_int_callback,
 680         .port_probe =           f81232_port_probe,
 681         .port_remove =          f81232_port_remove,
 682 };
 683
 684 static struct usb_serial_driver * const serial_drivers[] = {
 685         &f81232_device,
 686         NULL,
 687 };
 688
 689 module_usb_serial_driver(serial_drivers, id_table);
 690
 691 MODULE_DESCRIPTION("Fintek F81232 USB to serial adaptor driver");
 692 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
 693 MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
 694 MODULE_LICENSE("GPL v2");