drivers/usb/serial/f81232.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Fintek F81232 USB to serial adaptor driver
   4  * Fintek F81532A/534A/535/536 USB to 2/4/8/12 serial adaptor driver
   5  *
   6  * Copyright (C) 2012 Greg Kroah-Hartman (gregkh@linuxfoundation.org)
   7  * Copyright (C) 2012 Linux Foundation
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/errno.h>
  12 #include <linux/slab.h>
  13 #include <linux/tty.h>
  14 #include <linux/tty_driver.h>
  15 #include <linux/tty_flip.h>
  16 #include <linux/serial.h>
  17 #include <linux/module.h>
  18 #include <linux/moduleparam.h>
  19 #include <linux/mutex.h>
  20 #include <linux/uaccess.h>
  21 #include <linux/usb.h>
  22 #include <linux/usb/serial.h>
  23 #include <linux/serial_reg.h>
  24
  25 #define F81232_ID               \
  26         { USB_DEVICE(0x1934, 0x0706) }  /* 1 port UART device */
  27
  28 #define F81534A_SERIES_ID       \
  29         { USB_DEVICE(0x2c42, 0x1602) }, /* In-Box 2 port UART device */ \
  30         { USB_DEVICE(0x2c42, 0x1604) }, /* In-Box 4 port UART device */ \
  31         { USB_DEVICE(0x2c42, 0x1605) }, /* In-Box 8 port UART device */ \
  32         { USB_DEVICE(0x2c42, 0x1606) }, /* In-Box 12 port UART device */ \
  33         { USB_DEVICE(0x2c42, 0x1608) }, /* Non-Flash type */ \
  34         { USB_DEVICE(0x2c42, 0x1632) }, /* 2 port UART device */ \
  35         { USB_DEVICE(0x2c42, 0x1634) }, /* 4 port UART device */ \
  36         { USB_DEVICE(0x2c42, 0x1635) }, /* 8 port UART device */ \
  37         { USB_DEVICE(0x2c42, 0x1636) }  /* 12 port UART device */
  38
  39 #define F81534A_CTRL_ID         \
  40         { USB_DEVICE(0x2c42, 0x16f8) }  /* Global control device */
  41
  42 static const struct usb_device_id f81232_id_table[] = {
  43         F81232_ID,
  44         { }                                     /* Terminating entry */
  45 };
  46
  47 static const struct usb_device_id f81534a_id_table[] = {
  48         F81534A_SERIES_ID,
  49         { }                                     /* Terminating entry */
  50 };
  51
  52 static const struct usb_device_id f81534a_ctrl_id_table[] = {
  53         F81534A_CTRL_ID,
  54         { }                                     /* Terminating entry */
  55 };
  56
  57 static const struct usb_device_id combined_id_table[] = {
  58         F81232_ID,
  59         F81534A_SERIES_ID,
  60         F81534A_CTRL_ID,
  61         { }                                     /* Terminating entry */
  62 };
  63 MODULE_DEVICE_TABLE(usb, combined_id_table);
  64
  65 /* Maximum baudrate for F81232 */
  66 #define F81232_MAX_BAUDRATE             1500000
  67 #define F81232_DEF_BAUDRATE             9600
  68
  69 /* USB Control EP parameter */
  70 #define F81232_REGISTER_REQUEST         0xa0
  71 #define F81232_GET_REGISTER             0xc0
  72 #define F81232_SET_REGISTER             0x40
  73 #define F81534A_ACCESS_REG_RETRY        2
  74
  75 #define SERIAL_BASE_ADDRESS             0x0120
  76 #define RECEIVE_BUFFER_REGISTER         (0x00 + SERIAL_BASE_ADDRESS)
  77 #define INTERRUPT_ENABLE_REGISTER       (0x01 + SERIAL_BASE_ADDRESS)
  78 #define FIFO_CONTROL_REGISTER           (0x02 + SERIAL_BASE_ADDRESS)
  79 #define LINE_CONTROL_REGISTER           (0x03 + SERIAL_BASE_ADDRESS)
  80 #define MODEM_CONTROL_REGISTER          (0x04 + SERIAL_BASE_ADDRESS)
  81 #define LINE_STATUS_REGISTER            (0x05 + SERIAL_BASE_ADDRESS)
  82 #define MODEM_STATUS_REGISTER           (0x06 + SERIAL_BASE_ADDRESS)
  83
  84 /*
  85  * F81232 Clock registers (106h)
  86  *
  87  * Bit1-0:      Clock source selector
  88  *                      00: 1.846MHz.
  89  *                      01: 18.46MHz.
  90  *                      10: 24MHz.
  91  *                      11: 14.77MHz.
  92  */
  93 #define F81232_CLK_REGISTER             0x106
  94 #define F81232_CLK_1_846_MHZ            0
  95 #define F81232_CLK_18_46_MHZ            BIT(0)
  96 #define F81232_CLK_24_MHZ               BIT(1)
  97 #define F81232_CLK_14_77_MHZ            (BIT(1) | BIT(0))
  98 #define F81232_CLK_MASK                 GENMASK(1, 0)
  99
 100 #define F81534A_MODE_REG                0x107
 101 #define F81534A_TRIGGER_MASK            GENMASK(3, 2)
 102 #define F81534A_TRIGGER_MULTIPLE_4X     BIT(3)
 103 #define F81534A_FIFO_128BYTE            (BIT(1) | BIT(0))
 104
 105 /* Serial port self GPIO control, 2bytes [control&output data][input data] */
 106 #define F81534A_GPIO_REG                0x10e
 107 #define F81534A_GPIO_MODE2_DIR          BIT(6) /* 1: input, 0: output */
 108 #define F81534A_GPIO_MODE1_DIR          BIT(5)
 109 #define F81534A_GPIO_MODE0_DIR          BIT(4)
 110 #define F81534A_GPIO_MODE2_OUTPUT       BIT(2)
 111 #define F81534A_GPIO_MODE1_OUTPUT       BIT(1)
 112 #define F81534A_GPIO_MODE0_OUTPUT       BIT(0)
 113
 114 #define F81534A_CTRL_CMD_ENABLE_PORT    0x116
 115
 116 struct f81232_private {
 117         struct mutex lock;
 118         u8 modem_control;
 119         u8 modem_status;
 120         u8 shadow_lcr;
 121         speed_t baud_base;
 122         struct work_struct lsr_work;
 123         struct work_struct interrupt_work;
 124         struct usb_serial_port *port;
 125 };
 126
 127 static u32 const baudrate_table[] = { 115200, 921600, 1152000, 1500000 };
 128 static u8 const clock_table[] = { F81232_CLK_1_846_MHZ, F81232_CLK_14_77_MHZ,
 129                                 F81232_CLK_18_46_MHZ, F81232_CLK_24_MHZ };
 130
 131 static int calc_baud_divisor(speed_t baudrate, speed_t clockrate)
 132 {
 133         return DIV_ROUND_CLOSEST(clockrate, baudrate);
 134 }
 135
 136 static int f81232_get_register(struct usb_serial_port *port, u16 reg, u8 *val)
 137 {
 138         int status;
 139         u8 *tmp;
 140         struct usb_device *dev = port->serial->dev;
 141
 142         tmp = kmalloc(sizeof(*val), GFP_KERNEL);
 143         if (!tmp)
 144                 return -ENOMEM;
 145
 146         status = usb_control_msg(dev,
 147                                 usb_rcvctrlpipe(dev, 0),
 148                                 F81232_REGISTER_REQUEST,
 149                                 F81232_GET_REGISTER,
 150                                 reg,
 151                                 0,
 152                                 tmp,
 153                                 sizeof(*val),
 154                                 USB_CTRL_GET_TIMEOUT);
 155         if (status != sizeof(*val)) {
 156                 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
 157
 158                 if (status < 0)
 159                         status = usb_translate_errors(status);
 160                 else
 161                         status = -EIO;
 162         } else {
 163                 status = 0;
 164                 *val = *tmp;
 165         }
 166
 167         kfree(tmp);
 168         return status;
 169 }
 170
 171 static int f81232_set_register(struct usb_serial_port *port, u16 reg, u8 val)
 172 {
 173         int status;
 174         u8 *tmp;
 175         struct usb_device *dev = port->serial->dev;
 176
 177         tmp = kmalloc(sizeof(val), GFP_KERNEL);
 178         if (!tmp)
 179                 return -ENOMEM;
 180
 181         *tmp = val;
 182
 183         status = usb_control_msg(dev,
 184                                 usb_sndctrlpipe(dev, 0),
 185                                 F81232_REGISTER_REQUEST,
 186                                 F81232_SET_REGISTER,
 187                                 reg,
 188                                 0,
 189                                 tmp,
 190                                 sizeof(val),
 191                                 USB_CTRL_SET_TIMEOUT);
 192         if (status != sizeof(val)) {
 193                 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
 194
 195                 if (status < 0)
 196                         status = usb_translate_errors(status);
 197                 else
 198                         status = -EIO;
 199         } else {
 200                 status = 0;
 201         }
 202
 203         kfree(tmp);
 204         return status;
 205 }
 206
 207 static int f81232_set_mask_register(struct usb_serial_port *port, u16 reg,
 208                                         u8 mask, u8 val)
 209 {
 210         int status;
 211         u8 tmp;
 212
 213         status = f81232_get_register(port, reg, &tmp);
 214         if (status)
 215                 return status;
 216
 217         tmp = (tmp & ~mask) | (val & mask);
 218
 219         return f81232_set_register(port, reg, tmp);
 220 }
 221
 222 static void f81232_read_msr(struct usb_serial_port *port)
 223 {
 224         int status;
 225         u8 current_msr;
 226         struct tty_struct *tty;
 227         struct f81232_private *priv = usb_get_serial_port_data(port);
 228
 229         mutex_lock(&priv->lock);
 230         status = f81232_get_register(port, MODEM_STATUS_REGISTER,
 231                         &current_msr);
 232         if (status) {
 233                 dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
 234                 mutex_unlock(&priv->lock);
 235                 return;
 236         }
 237
 238         if (!(current_msr & UART_MSR_ANY_DELTA)) {
 239                 mutex_unlock(&priv->lock);
 240                 return;
 241         }
 242
 243         priv->modem_status = current_msr;
 244
 245         if (current_msr & UART_MSR_DCTS)
 246                 port->icount.cts++;
 247         if (current_msr & UART_MSR_DDSR)
 248                 port->icount.dsr++;
 249         if (current_msr & UART_MSR_TERI)
 250                 port->icount.rng++;
 251         if (current_msr & UART_MSR_DDCD) {
 252                 port->icount.dcd++;
 253                 tty = tty_port_tty_get(&port->port);
 254                 if (tty) {
 255                         usb_serial_handle_dcd_change(port, tty,
 256                                         current_msr & UART_MSR_DCD);
 257
 258                         tty_kref_put(tty);
 259                 }
 260         }
 261
 262         wake_up_interruptible(&port->port.delta_msr_wait);
 263         mutex_unlock(&priv->lock);
 264 }
 265
 266 static int f81232_set_mctrl(struct usb_serial_port *port,
 267                                            unsigned int set, unsigned int clear)
 268 {
 269         u8 val;
 270         int status;
 271         struct f81232_private *priv = usb_get_serial_port_data(port);
 272
 273         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
 274                 return 0;       /* no change */
 275
 276         /* 'set' takes precedence over 'clear' */
 277         clear &= ~set;
 278
 279         /* force enable interrupt with OUT2 */
 280         mutex_lock(&priv->lock);
 281         val = UART_MCR_OUT2 | priv->modem_control;
 282
 283         if (clear & TIOCM_DTR)
 284                 val &= ~UART_MCR_DTR;
 285
 286         if (clear & TIOCM_RTS)
 287                 val &= ~UART_MCR_RTS;
 288
 289         if (set & TIOCM_DTR)
 290                 val |= UART_MCR_DTR;
 291
 292         if (set & TIOCM_RTS)
 293                 val |= UART_MCR_RTS;
 294
 295         dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
 296                         val, priv->modem_control);
 297
 298         status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
 299         if (status) {
 300                 dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
 301                 mutex_unlock(&priv->lock);
 302                 return status;
 303         }
 304
 305         priv->modem_control = val;
 306         mutex_unlock(&priv->lock);
 307
 308         return 0;
 309 }
 310
 311 static void f81232_update_line_status(struct usb_serial_port *port,
 312                                       unsigned char *data,
 313                                       size_t actual_length)
 314 {
 315         struct f81232_private *priv = usb_get_serial_port_data(port);
 316
 317         if (!actual_length)
 318                 return;
 319
 320         switch (data[0] & 0x07) {
 321         case 0x00: /* msr change */
 322                 dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
 323                 schedule_work(&priv->interrupt_work);
 324                 break;
 325         case 0x02: /* tx-empty */
 326                 break;
 327         case 0x04: /* rx data available */
 328                 break;
 329         case 0x06: /* lsr change */
 330                 /* we can forget it. the LSR will read from bulk-in */
 331                 dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
 332                 break;
 333         }
 334 }
 335
 336 static void f81232_read_int_callback(struct urb *urb)
 337 {
 338         struct usb_serial_port *port =  urb->context;
 339         unsigned char *data = urb->transfer_buffer;
 340         unsigned int actual_length = urb->actual_length;
 341         int status = urb->status;
 342         int retval;
 343
 344         switch (status) {
 345         case 0:
 346                 /* success */
 347                 break;
 348         case -ECONNRESET:
 349         case -ENOENT:
 350         case -ESHUTDOWN:
 351                 /* this urb is terminated, clean up */
 352                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
 353                         __func__, status);
 354                 return;
 355         default:
 356                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
 357                         __func__, status);
 358                 goto exit;
 359         }
 360
 361         usb_serial_debug_data(&port->dev, __func__,
 362                               urb->actual_length, urb->transfer_buffer);
 363
 364         f81232_update_line_status(port, data, actual_length);
 365
 366 exit:
 367         retval = usb_submit_urb(urb, GFP_ATOMIC);
 368         if (retval)
 369                 dev_err(&urb->dev->dev,
 370                         "%s - usb_submit_urb failed with result %d\n",
 371                         __func__, retval);
 372 }
 373
 374 static char f81232_handle_lsr(struct usb_serial_port *port, u8 lsr)
 375 {
 376         struct f81232_private *priv = usb_get_serial_port_data(port);
 377         char tty_flag = TTY_NORMAL;
 378
 379         if (!(lsr & UART_LSR_BRK_ERROR_BITS))
 380                 return tty_flag;
 381
 382         if (lsr & UART_LSR_BI) {
 383                 tty_flag = TTY_BREAK;
 384                 port->icount.brk++;
 385                 usb_serial_handle_break(port);
 386         } else if (lsr & UART_LSR_PE) {
 387                 tty_flag = TTY_PARITY;
 388                 port->icount.parity++;
 389         } else if (lsr & UART_LSR_FE) {
 390                 tty_flag = TTY_FRAME;
 391                 port->icount.frame++;
 392         }
 393
 394         if (lsr & UART_LSR_OE) {
 395                 port->icount.overrun++;
 396                 schedule_work(&priv->lsr_work);
 397                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 398         }
 399
 400         return tty_flag;
 401 }
 402
 403 static void f81232_process_read_urb(struct urb *urb)
 404 {
 405         struct usb_serial_port *port = urb->context;
 406         unsigned char *data = urb->transfer_buffer;
 407         char tty_flag;
 408         unsigned int i;
 409         u8 lsr;
 410
 411         /*
 412          * When opening the port we get a 1-byte packet with the current LSR,
 413          * which we discard.
 414          */
 415         if ((urb->actual_length < 2) || (urb->actual_length % 2))
 416                 return;
 417
 418         /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
 419
 420         for (i = 0; i < urb->actual_length; i += 2) {
 421                 lsr = data[i];
 422                 tty_flag = f81232_handle_lsr(port, lsr);
 423
 424                 if (port->sysrq) {
 425                         if (usb_serial_handle_sysrq_char(port, data[i + 1]))
 426                                 continue;
 427                 }
 428
 429                 tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
 430         }
 431
 432         tty_flip_buffer_push(&port->port);
 433 }
 434
 435 static void f81534a_process_read_urb(struct urb *urb)
 436 {
 437         struct usb_serial_port *port = urb->context;
 438         unsigned char *data = urb->transfer_buffer;
 439         char tty_flag;
 440         unsigned int i;
 441         u8 lsr;
 442         u8 len;
 443
 444         if (urb->actual_length < 3) {
 445                 dev_err(&port->dev, "short message received: %d\n",
 446                                 urb->actual_length);
 447                 return;
 448         }
 449
 450         len = data[0];
 451         if (len != urb->actual_length) {
 452                 dev_err(&port->dev, "malformed message received: %d (%d)\n",
 453                                 urb->actual_length, len);
 454                 return;
 455         }
 456
 457         /* bulk-in data: [LEN][Data.....][LSR] */
 458         lsr = data[len - 1];
 459         tty_flag = f81232_handle_lsr(port, lsr);
 460
 461         if (port->sysrq) {
 462                 for (i = 1; i < len - 1; ++i) {
 463                         if (!usb_serial_handle_sysrq_char(port, data[i])) {
 464                                 tty_insert_flip_char(&port->port, data[i],
 465                                                 tty_flag);
 466                         }
 467                 }
 468         } else {
 469                 tty_insert_flip_string_fixed_flag(&port->port, &data[1],
 470                                                         tty_flag, len - 2);
 471         }
 472
 473         tty_flip_buffer_push(&port->port);
 474 }
 475
 476 static void f81232_break_ctl(struct tty_struct *tty, int break_state)
 477 {
 478         struct usb_serial_port *port = tty->driver_data;
 479         struct f81232_private *priv = usb_get_serial_port_data(port);
 480         int status;
 481
 482         mutex_lock(&priv->lock);
 483
 484         if (break_state)
 485                 priv->shadow_lcr |= UART_LCR_SBC;
 486         else
 487                 priv->shadow_lcr &= ~UART_LCR_SBC;
 488
 489         status = f81232_set_register(port, LINE_CONTROL_REGISTER,
 490                                         priv->shadow_lcr);
 491         if (status)
 492                 dev_err(&port->dev, "set break failed: %d\n", status);
 493
 494         mutex_unlock(&priv->lock);
 495 }
 496
 497 static int f81232_find_clk(speed_t baudrate)
 498 {
 499         int idx;
 500
 501         for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) {
 502                 if (baudrate <= baudrate_table[idx] &&
 503                                 baudrate_table[idx] % baudrate == 0)
 504                         return idx;
 505         }
 506
 507         return -EINVAL;
 508 }
 509
 510 static void f81232_set_baudrate(struct tty_struct *tty,
 511                                 struct usb_serial_port *port, speed_t baudrate,
 512                                 speed_t old_baudrate)
 513 {
 514         struct f81232_private *priv = usb_get_serial_port_data(port);
 515         u8 lcr;
 516         int divisor;
 517         int status = 0;
 518         int i;
 519         int idx;
 520         speed_t baud_list[] = { baudrate, old_baudrate, F81232_DEF_BAUDRATE };
 521
 522         for (i = 0; i < ARRAY_SIZE(baud_list); ++i) {
 523                 baudrate = baud_list[i];
 524                 if (baudrate == 0) {
 525                         tty_encode_baud_rate(tty, 0, 0);
 526                         return;
 527                 }
 528
 529                 idx = f81232_find_clk(baudrate);
 530                 if (idx >= 0) {
 531                         tty_encode_baud_rate(tty, baudrate, baudrate);
 532                         break;
 533                 }
 534         }
 535
 536         if (idx < 0)
 537                 return;
 538
 539         priv->baud_base = baudrate_table[idx];
 540         divisor = calc_baud_divisor(baudrate, priv->baud_base);
 541
 542         status = f81232_set_mask_register(port, F81232_CLK_REGISTER,
 543                         F81232_CLK_MASK, clock_table[idx]);
 544         if (status) {
 545                 dev_err(&port->dev, "%s failed to set CLK_REG: %d\n",
 546                         __func__, status);
 547                 return;
 548         }
 549
 550         status = f81232_get_register(port, LINE_CONTROL_REGISTER,
 551                          &lcr); /* get LCR */
 552         if (status) {
 553                 dev_err(&port->dev, "%s failed to get LCR: %d\n",
 554                         __func__, status);
 555                 return;
 556         }
 557
 558         status = f81232_set_register(port, LINE_CONTROL_REGISTER,
 559                          lcr | UART_LCR_DLAB); /* Enable DLAB */
 560         if (status) {
 561                 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
 562                         __func__, status);
 563                 return;
 564         }
 565
 566         status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
 567                          divisor & 0x00ff); /* low */
 568         if (status) {
 569                 dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
 570                         __func__, status);
 571                 goto reapply_lcr;
 572         }
 573
 574         status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
 575                          (divisor & 0xff00) >> 8); /* high */
 576         if (status) {
 577                 dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
 578                         __func__, status);
 579         }
 580
 581 reapply_lcr:
 582         status = f81232_set_register(port, LINE_CONTROL_REGISTER,
 583                         lcr & ~UART_LCR_DLAB);
 584         if (status) {
 585                 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
 586                         __func__, status);
 587         }
 588 }
 589
 590 static int f81232_port_enable(struct usb_serial_port *port)
 591 {
 592         u8 val;
 593         int status;
 594
 595         /* fifo on, trigger8, clear TX/RX*/
 596         val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
 597                         UART_FCR_CLEAR_XMIT;
 598
 599         status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
 600         if (status) {
 601                 dev_err(&port->dev, "%s failed to set FCR: %d\n",
 602                         __func__, status);
 603                 return status;
 604         }
 605
 606         /* MSR Interrupt only, LSR will read from Bulk-in odd byte */
 607         status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
 608                         UART_IER_MSI);
 609         if (status) {
 610                 dev_err(&port->dev, "%s failed to set IER: %d\n",
 611                         __func__, status);
 612                 return status;
 613         }
 614
 615         return 0;
 616 }
 617
 618 static int f81232_port_disable(struct usb_serial_port *port)
 619 {
 620         int status;
 621
 622         status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
 623         if (status) {
 624                 dev_err(&port->dev, "%s failed to set IER: %d\n",
 625                         __func__, status);
 626                 return status;
 627         }
 628
 629         return 0;
 630 }
 631
 632 static void f81232_set_termios(struct tty_struct *tty,
 633                 struct usb_serial_port *port, struct ktermios *old_termios)
 634 {
 635         struct f81232_private *priv = usb_get_serial_port_data(port);
 636         u8 new_lcr = 0;
 637         int status = 0;
 638         speed_t baudrate;
 639         speed_t old_baud;
 640
 641         /* Don't change anything if nothing has changed */
 642         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
 643                 return;
 644
 645         if (C_BAUD(tty) == B0)
 646                 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
 647         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 648                 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
 649
 650         baudrate = tty_get_baud_rate(tty);
 651         if (baudrate > 0) {
 652                 if (old_termios)
 653                         old_baud = tty_termios_baud_rate(old_termios);
 654                 else
 655                         old_baud = F81232_DEF_BAUDRATE;
 656
 657                 f81232_set_baudrate(tty, port, baudrate, old_baud);
 658         }
 659
 660         if (C_PARENB(tty)) {
 661                 new_lcr |= UART_LCR_PARITY;
 662
 663                 if (!C_PARODD(tty))
 664                         new_lcr |= UART_LCR_EPAR;
 665
 666                 if (C_CMSPAR(tty))
 667                         new_lcr |= UART_LCR_SPAR;
 668         }
 669
 670         if (C_CSTOPB(tty))
 671                 new_lcr |= UART_LCR_STOP;
 672
 673         switch (C_CSIZE(tty)) {
 674         case CS5:
 675                 new_lcr |= UART_LCR_WLEN5;
 676                 break;
 677         case CS6:
 678                 new_lcr |= UART_LCR_WLEN6;
 679                 break;
 680         case CS7:
 681                 new_lcr |= UART_LCR_WLEN7;
 682                 break;
 683         default:
 684         case CS8:
 685                 new_lcr |= UART_LCR_WLEN8;
 686                 break;
 687         }
 688
 689         mutex_lock(&priv->lock);
 690
 691         new_lcr |= (priv->shadow_lcr & UART_LCR_SBC);
 692         status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
 693         if (status) {
 694                 dev_err(&port->dev, "%s failed to set LCR: %d\n",
 695                         __func__, status);
 696         }
 697
 698         priv->shadow_lcr = new_lcr;
 699
 700         mutex_unlock(&priv->lock);
 701 }
 702
 703 static int f81232_tiocmget(struct tty_struct *tty)
 704 {
 705         int r;
 706         struct usb_serial_port *port = tty->driver_data;
 707         struct f81232_private *port_priv = usb_get_serial_port_data(port);
 708         u8 mcr, msr;
 709
 710         /* force get current MSR changed state */
 711         f81232_read_msr(port);
 712
 713         mutex_lock(&port_priv->lock);
 714         mcr = port_priv->modem_control;
 715         msr = port_priv->modem_status;
 716         mutex_unlock(&port_priv->lock);
 717
 718         r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
 719                 (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
 720                 (msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
 721                 (msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
 722                 (msr & UART_MSR_RI ? TIOCM_RI : 0) |
 723                 (msr & UART_MSR_DSR ? TIOCM_DSR : 0);
 724
 725         return r;
 726 }
 727
 728 static int f81232_tiocmset(struct tty_struct *tty,
 729                         unsigned int set, unsigned int clear)
 730 {
 731         struct usb_serial_port *port = tty->driver_data;
 732
 733         return f81232_set_mctrl(port, set, clear);
 734 }
 735
 736 static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
 737 {
 738         int result;
 739
 740         result = f81232_port_enable(port);
 741         if (result)
 742                 return result;
 743
 744         /* Setup termios */
 745         if (tty)
 746                 f81232_set_termios(tty, port, NULL);
 747
 748         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 749         if (result) {
 750                 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
 751                         " error %d\n", __func__, result);
 752                 return result;
 753         }
 754
 755         result = usb_serial_generic_open(tty, port);
 756         if (result) {
 757                 usb_kill_urb(port->interrupt_in_urb);
 758                 return result;
 759         }
 760
 761         return 0;
 762 }
 763
 764 static int f81534a_open(struct tty_struct *tty, struct usb_serial_port *port)
 765 {
 766         int status;
 767         u8 mask;
 768         u8 val;
 769
 770         val = F81534A_TRIGGER_MULTIPLE_4X | F81534A_FIFO_128BYTE;
 771         mask = F81534A_TRIGGER_MASK | F81534A_FIFO_128BYTE;
 772
 773         status = f81232_set_mask_register(port, F81534A_MODE_REG, mask, val);
 774         if (status) {
 775                 dev_err(&port->dev, "failed to set MODE_REG: %d\n", status);
 776                 return status;
 777         }
 778
 779         return f81232_open(tty, port);
 780 }
 781
 782 static void f81232_close(struct usb_serial_port *port)
 783 {
 784         struct f81232_private *port_priv = usb_get_serial_port_data(port);
 785
 786         f81232_port_disable(port);
 787         usb_serial_generic_close(port);
 788         usb_kill_urb(port->interrupt_in_urb);
 789         flush_work(&port_priv->interrupt_work);
 790         flush_work(&port_priv->lsr_work);
 791 }
 792
 793 static void f81232_dtr_rts(struct usb_serial_port *port, int on)
 794 {
 795         if (on)
 796                 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
 797         else
 798                 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
 799 }
 800
 801 static bool f81232_tx_empty(struct usb_serial_port *port)
 802 {
 803         int status;
 804         u8 tmp;
 805
 806         status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
 807         if (!status) {
 808                 if ((tmp & UART_LSR_TEMT) != UART_LSR_TEMT)
 809                         return false;
 810         }
 811
 812         return true;
 813 }
 814
 815 static int f81232_carrier_raised(struct usb_serial_port *port)
 816 {
 817         u8 msr;
 818         struct f81232_private *priv = usb_get_serial_port_data(port);
 819
 820         mutex_lock(&priv->lock);
 821         msr = priv->modem_status;
 822         mutex_unlock(&priv->lock);
 823
 824         if (msr & UART_MSR_DCD)
 825                 return 1;
 826         return 0;
 827 }
 828
 829 static int f81232_get_serial_info(struct tty_struct *tty,
 830                 struct serial_struct *ss)
 831 {
 832         struct usb_serial_port *port = tty->driver_data;
 833         struct f81232_private *priv = usb_get_serial_port_data(port);
 834
 835         ss->type = PORT_16550A;
 836         ss->line = port->minor;
 837         ss->port = port->port_number;
 838         ss->baud_base = priv->baud_base;
 839         return 0;
 840 }
 841
 842 static void  f81232_interrupt_work(struct work_struct *work)
 843 {
 844         struct f81232_private *priv =
 845                 container_of(work, struct f81232_private, interrupt_work);
 846
 847         f81232_read_msr(priv->port);
 848 }
 849
 850 static void f81232_lsr_worker(struct work_struct *work)
 851 {
 852         struct f81232_private *priv;
 853         struct usb_serial_port *port;
 854         int status;
 855         u8 tmp;
 856
 857         priv = container_of(work, struct f81232_private, lsr_work);
 858         port = priv->port;
 859
 860         status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
 861         if (status)
 862                 dev_warn(&port->dev, "read LSR failed: %d\n", status);
 863 }
 864
 865 static int f81534a_ctrl_set_register(struct usb_interface *intf, u16 reg,
 866                                         u16 size, void *val)
 867 {
 868         struct usb_device *dev = interface_to_usbdev(intf);
 869         int retry = F81534A_ACCESS_REG_RETRY;
 870         int status;
 871         u8 *tmp;
 872
 873         tmp = kmemdup(val, size, GFP_KERNEL);
 874         if (!tmp)
 875                 return -ENOMEM;
 876
 877         while (retry--) {
 878                 status = usb_control_msg(dev,
 879                                         usb_sndctrlpipe(dev, 0),
 880                                         F81232_REGISTER_REQUEST,
 881                                         F81232_SET_REGISTER,
 882                                         reg,
 883                                         0,
 884                                         tmp,
 885                                         size,
 886                                         USB_CTRL_SET_TIMEOUT);
 887                 if (status < 0) {
 888                         status = usb_translate_errors(status);
 889                         if (status == -EIO)
 890                                 continue;
 891                 } else if (status != size) {
 892                         /* Retry on short transfers */
 893                         status = -EIO;
 894                         continue;
 895                 } else {
 896                         status = 0;
 897                 }
 898
 899                 break;
 900         }
 901
 902         if (status) {
 903                 dev_err(&intf->dev, "failed to set register 0x%x: %d\n",
 904                                 reg, status);
 905         }
 906
 907         kfree(tmp);
 908         return status;
 909 }
 910
 911 static int f81534a_ctrl_enable_all_ports(struct usb_interface *intf, bool en)
 912 {
 913         unsigned char enable[2] = {0};
 914         int status;
 915
 916         /*
 917          * Enable all available serial ports, define as following:
 918          * bit 15       : Reset behavior (when HUB got soft reset)
 919          *                      0: maintain all serial port enabled state.
 920          *                      1: disable all serial port.
 921          * bit 0~11     : Serial port enable bit.
 922          */
 923         if (en) {
 924                 enable[0] = 0xff;
 925                 enable[1] = 0x8f;
 926         }
 927
 928         status = f81534a_ctrl_set_register(intf, F81534A_CTRL_CMD_ENABLE_PORT,
 929                         sizeof(enable), enable);
 930         if (status)
 931                 dev_err(&intf->dev, "failed to enable ports: %d\n", status);
 932
 933         return status;
 934 }
 935
 936 static int f81534a_ctrl_probe(struct usb_interface *intf,
 937                                 const struct usb_device_id *id)
 938 {
 939         return f81534a_ctrl_enable_all_ports(intf, true);
 940 }
 941
 942 static void f81534a_ctrl_disconnect(struct usb_interface *intf)
 943 {
 944         f81534a_ctrl_enable_all_ports(intf, false);
 945 }
 946
 947 static int f81534a_ctrl_resume(struct usb_interface *intf)
 948 {
 949         return f81534a_ctrl_enable_all_ports(intf, true);
 950 }
 951
 952 static int f81232_port_probe(struct usb_serial_port *port)
 953 {
 954         struct f81232_private *priv;
 955
 956         priv = devm_kzalloc(&port->dev, sizeof(*priv), GFP_KERNEL);
 957         if (!priv)
 958                 return -ENOMEM;
 959
 960         mutex_init(&priv->lock);
 961         INIT_WORK(&priv->interrupt_work,  f81232_interrupt_work);
 962         INIT_WORK(&priv->lsr_work, f81232_lsr_worker);
 963
 964         usb_set_serial_port_data(port, priv);
 965
 966         port->port.drain_delay = 256;
 967         priv->port = port;
 968
 969         return 0;
 970 }
 971
 972 static int f81534a_port_probe(struct usb_serial_port *port)
 973 {
 974         int status;
 975
 976         /* tri-state with pull-high, default RS232 Mode */
 977         status = f81232_set_register(port, F81534A_GPIO_REG,
 978                                         F81534A_GPIO_MODE2_DIR);
 979         if (status)
 980                 return status;
 981
 982         return f81232_port_probe(port);
 983 }
 984
 985 static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
 986 {
 987         struct usb_serial_port *port = serial->port[0];
 988         struct f81232_private *port_priv = usb_get_serial_port_data(port);
 989         int i;
 990
 991         for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
 992                 usb_kill_urb(port->read_urbs[i]);
 993
 994         usb_kill_urb(port->interrupt_in_urb);
 995
 996         if (port_priv) {
 997                 flush_work(&port_priv->interrupt_work);
 998                 flush_work(&port_priv->lsr_work);
 999         }
1000
1001         return 0;
1002 }
1003
1004 static int f81232_resume(struct usb_serial *serial)
1005 {
1006         struct usb_serial_port *port = serial->port[0];
1007         int result;
1008
1009         if (tty_port_initialized(&port->port)) {
1010                 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
1011                 if (result) {
1012                         dev_err(&port->dev, "submit interrupt urb failed: %d\n",
1013                                         result);
1014                         return result;
1015                 }
1016         }
1017
1018         return usb_serial_generic_resume(serial);
1019 }
1020
1021 static struct usb_serial_driver f81232_device = {
1022         .driver = {
1023                 .owner =        THIS_MODULE,
1024                 .name =         "f81232",
1025         },
1026         .id_table =             f81232_id_table,
1027         .num_ports =            1,
1028         .bulk_in_size =         256,
1029         .bulk_out_size =        256,
1030         .open =                 f81232_open,
1031         .close =                f81232_close,
1032         .dtr_rts =              f81232_dtr_rts,
1033         .carrier_raised =       f81232_carrier_raised,
1034         .get_serial =           f81232_get_serial_info,
1035         .break_ctl =            f81232_break_ctl,
1036         .set_termios =          f81232_set_termios,
1037         .tiocmget =             f81232_tiocmget,
1038         .tiocmset =             f81232_tiocmset,
1039         .tiocmiwait =           usb_serial_generic_tiocmiwait,
1040         .tx_empty =             f81232_tx_empty,
1041         .process_read_urb =     f81232_process_read_urb,
1042         .read_int_callback =    f81232_read_int_callback,
1043         .port_probe =           f81232_port_probe,
1044         .suspend =              f81232_suspend,
1045         .resume =               f81232_resume,
1046 };
1047
1048 static struct usb_serial_driver f81534a_device = {
1049         .driver = {
1050                 .owner =        THIS_MODULE,
1051                 .name =         "f81534a",
1052         },
1053         .id_table =             f81534a_id_table,
1054         .num_ports =            1,
1055         .open =                 f81534a_open,
1056         .close =                f81232_close,
1057         .dtr_rts =              f81232_dtr_rts,
1058         .carrier_raised =       f81232_carrier_raised,
1059         .get_serial =           f81232_get_serial_info,
1060         .break_ctl =            f81232_break_ctl,
1061         .set_termios =          f81232_set_termios,
1062         .tiocmget =             f81232_tiocmget,
1063         .tiocmset =             f81232_tiocmset,
1064         .tiocmiwait =           usb_serial_generic_tiocmiwait,
1065         .tx_empty =             f81232_tx_empty,
1066         .process_read_urb =     f81534a_process_read_urb,
1067         .read_int_callback =    f81232_read_int_callback,
1068         .port_probe =           f81534a_port_probe,
1069         .suspend =              f81232_suspend,
1070         .resume =               f81232_resume,
1071 };
1072
1073 static struct usb_serial_driver * const serial_drivers[] = {
1074         &f81232_device,
1075         &f81534a_device,
1076         NULL,
1077 };
1078
1079 static struct usb_driver f81534a_ctrl_driver = {
1080         .name =         "f81534a_ctrl",
1081         .id_table =     f81534a_ctrl_id_table,
1082         .probe =        f81534a_ctrl_probe,
1083         .disconnect =   f81534a_ctrl_disconnect,
1084         .resume =       f81534a_ctrl_resume,
1085 };
1086
1087 static int __init f81232_init(void)
1088 {
1089         int status;
1090
1091         status = usb_register_driver(&f81534a_ctrl_driver, THIS_MODULE,
1092                         KBUILD_MODNAME);
1093         if (status)
1094                 return status;
1095
1096         status = usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME,
1097                         combined_id_table);
1098         if (status) {
1099                 usb_deregister(&f81534a_ctrl_driver);
1100                 return status;
1101         }
1102
1103         return 0;
1104 }
1105
1106 static void __exit f81232_exit(void)
1107 {
1108         usb_serial_deregister_drivers(serial_drivers);
1109         usb_deregister(&f81534a_ctrl_driver);
1110 }
1111
1112 module_init(f81232_init);
1113 module_exit(f81232_exit);
1114
1115 MODULE_DESCRIPTION("Fintek F81232/532A/534A/535/536 USB to serial driver");
1116 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
1117 MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
1118 MODULE_LICENSE("GPL v2");