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 < 0) {
 193                 dev_err(&port->dev, "%s failed status: %d\n", __func__, status);
 194                 status = usb_translate_errors(status);
 195         } else {
 196                 status = 0;
 197         }
 198
 199         kfree(tmp);
 200         return status;
 201 }
 202
 203 static int f81232_set_mask_register(struct usb_serial_port *port, u16 reg,
 204                                         u8 mask, u8 val)
 205 {
 206         int status;
 207         u8 tmp;
 208
 209         status = f81232_get_register(port, reg, &tmp);
 210         if (status)
 211                 return status;
 212
 213         tmp = (tmp & ~mask) | (val & mask);
 214
 215         return f81232_set_register(port, reg, tmp);
 216 }
 217
 218 static void f81232_read_msr(struct usb_serial_port *port)
 219 {
 220         int status;
 221         u8 current_msr;
 222         struct tty_struct *tty;
 223         struct f81232_private *priv = usb_get_serial_port_data(port);
 224
 225         mutex_lock(&priv->lock);
 226         status = f81232_get_register(port, MODEM_STATUS_REGISTER,
 227                         &current_msr);
 228         if (status) {
 229                 dev_err(&port->dev, "%s fail, status: %d\n", __func__, status);
 230                 mutex_unlock(&priv->lock);
 231                 return;
 232         }
 233
 234         if (!(current_msr & UART_MSR_ANY_DELTA)) {
 235                 mutex_unlock(&priv->lock);
 236                 return;
 237         }
 238
 239         priv->modem_status = current_msr;
 240
 241         if (current_msr & UART_MSR_DCTS)
 242                 port->icount.cts++;
 243         if (current_msr & UART_MSR_DDSR)
 244                 port->icount.dsr++;
 245         if (current_msr & UART_MSR_TERI)
 246                 port->icount.rng++;
 247         if (current_msr & UART_MSR_DDCD) {
 248                 port->icount.dcd++;
 249                 tty = tty_port_tty_get(&port->port);
 250                 if (tty) {
 251                         usb_serial_handle_dcd_change(port, tty,
 252                                         current_msr & UART_MSR_DCD);
 253
 254                         tty_kref_put(tty);
 255                 }
 256         }
 257
 258         wake_up_interruptible(&port->port.delta_msr_wait);
 259         mutex_unlock(&priv->lock);
 260 }
 261
 262 static int f81232_set_mctrl(struct usb_serial_port *port,
 263                                            unsigned int set, unsigned int clear)
 264 {
 265         u8 val;
 266         int status;
 267         struct f81232_private *priv = usb_get_serial_port_data(port);
 268
 269         if (((set | clear) & (TIOCM_DTR | TIOCM_RTS)) == 0)
 270                 return 0;       /* no change */
 271
 272         /* 'set' takes precedence over 'clear' */
 273         clear &= ~set;
 274
 275         /* force enable interrupt with OUT2 */
 276         mutex_lock(&priv->lock);
 277         val = UART_MCR_OUT2 | priv->modem_control;
 278
 279         if (clear & TIOCM_DTR)
 280                 val &= ~UART_MCR_DTR;
 281
 282         if (clear & TIOCM_RTS)
 283                 val &= ~UART_MCR_RTS;
 284
 285         if (set & TIOCM_DTR)
 286                 val |= UART_MCR_DTR;
 287
 288         if (set & TIOCM_RTS)
 289                 val |= UART_MCR_RTS;
 290
 291         dev_dbg(&port->dev, "%s new:%02x old:%02x\n", __func__,
 292                         val, priv->modem_control);
 293
 294         status = f81232_set_register(port, MODEM_CONTROL_REGISTER, val);
 295         if (status) {
 296                 dev_err(&port->dev, "%s set MCR status < 0\n", __func__);
 297                 mutex_unlock(&priv->lock);
 298                 return status;
 299         }
 300
 301         priv->modem_control = val;
 302         mutex_unlock(&priv->lock);
 303
 304         return 0;
 305 }
 306
 307 static void f81232_update_line_status(struct usb_serial_port *port,
 308                                       unsigned char *data,
 309                                       size_t actual_length)
 310 {
 311         struct f81232_private *priv = usb_get_serial_port_data(port);
 312
 313         if (!actual_length)
 314                 return;
 315
 316         switch (data[0] & 0x07) {
 317         case 0x00: /* msr change */
 318                 dev_dbg(&port->dev, "IIR: MSR Change: %02x\n", data[0]);
 319                 schedule_work(&priv->interrupt_work);
 320                 break;
 321         case 0x02: /* tx-empty */
 322                 break;
 323         case 0x04: /* rx data available */
 324                 break;
 325         case 0x06: /* lsr change */
 326                 /* we can forget it. the LSR will read from bulk-in */
 327                 dev_dbg(&port->dev, "IIR: LSR Change: %02x\n", data[0]);
 328                 break;
 329         }
 330 }
 331
 332 static void f81232_read_int_callback(struct urb *urb)
 333 {
 334         struct usb_serial_port *port =  urb->context;
 335         unsigned char *data = urb->transfer_buffer;
 336         unsigned int actual_length = urb->actual_length;
 337         int status = urb->status;
 338         int retval;
 339
 340         switch (status) {
 341         case 0:
 342                 /* success */
 343                 break;
 344         case -ECONNRESET:
 345         case -ENOENT:
 346         case -ESHUTDOWN:
 347                 /* this urb is terminated, clean up */
 348                 dev_dbg(&port->dev, "%s - urb shutting down with status: %d\n",
 349                         __func__, status);
 350                 return;
 351         default:
 352                 dev_dbg(&port->dev, "%s - nonzero urb status received: %d\n",
 353                         __func__, status);
 354                 goto exit;
 355         }
 356
 357         usb_serial_debug_data(&port->dev, __func__,
 358                               urb->actual_length, urb->transfer_buffer);
 359
 360         f81232_update_line_status(port, data, actual_length);
 361
 362 exit:
 363         retval = usb_submit_urb(urb, GFP_ATOMIC);
 364         if (retval)
 365                 dev_err(&urb->dev->dev,
 366                         "%s - usb_submit_urb failed with result %d\n",
 367                         __func__, retval);
 368 }
 369
 370 static char f81232_handle_lsr(struct usb_serial_port *port, u8 lsr)
 371 {
 372         struct f81232_private *priv = usb_get_serial_port_data(port);
 373         char tty_flag = TTY_NORMAL;
 374
 375         if (!(lsr & UART_LSR_BRK_ERROR_BITS))
 376                 return tty_flag;
 377
 378         if (lsr & UART_LSR_BI) {
 379                 tty_flag = TTY_BREAK;
 380                 port->icount.brk++;
 381                 usb_serial_handle_break(port);
 382         } else if (lsr & UART_LSR_PE) {
 383                 tty_flag = TTY_PARITY;
 384                 port->icount.parity++;
 385         } else if (lsr & UART_LSR_FE) {
 386                 tty_flag = TTY_FRAME;
 387                 port->icount.frame++;
 388         }
 389
 390         if (lsr & UART_LSR_OE) {
 391                 port->icount.overrun++;
 392                 schedule_work(&priv->lsr_work);
 393                 tty_insert_flip_char(&port->port, 0, TTY_OVERRUN);
 394         }
 395
 396         return tty_flag;
 397 }
 398
 399 static void f81232_process_read_urb(struct urb *urb)
 400 {
 401         struct usb_serial_port *port = urb->context;
 402         unsigned char *data = urb->transfer_buffer;
 403         char tty_flag;
 404         unsigned int i;
 405         u8 lsr;
 406
 407         /*
 408          * When opening the port we get a 1-byte packet with the current LSR,
 409          * which we discard.
 410          */
 411         if ((urb->actual_length < 2) || (urb->actual_length % 2))
 412                 return;
 413
 414         /* bulk-in data: [LSR(1Byte)+DATA(1Byte)][LSR(1Byte)+DATA(1Byte)]... */
 415
 416         for (i = 0; i < urb->actual_length; i += 2) {
 417                 lsr = data[i];
 418                 tty_flag = f81232_handle_lsr(port, lsr);
 419
 420                 if (port->sysrq) {
 421                         if (usb_serial_handle_sysrq_char(port, data[i + 1]))
 422                                 continue;
 423                 }
 424
 425                 tty_insert_flip_char(&port->port, data[i + 1], tty_flag);
 426         }
 427
 428         tty_flip_buffer_push(&port->port);
 429 }
 430
 431 static void f81534a_process_read_urb(struct urb *urb)
 432 {
 433         struct usb_serial_port *port = urb->context;
 434         unsigned char *data = urb->transfer_buffer;
 435         char tty_flag;
 436         unsigned int i;
 437         u8 lsr;
 438         u8 len;
 439
 440         if (urb->actual_length < 3) {
 441                 dev_err(&port->dev, "short message received: %d\n",
 442                                 urb->actual_length);
 443                 return;
 444         }
 445
 446         len = data[0];
 447         if (len != urb->actual_length) {
 448                 dev_err(&port->dev, "malformed message received: %d (%d)\n",
 449                                 urb->actual_length, len);
 450                 return;
 451         }
 452
 453         /* bulk-in data: [LEN][Data.....][LSR] */
 454         lsr = data[len - 1];
 455         tty_flag = f81232_handle_lsr(port, lsr);
 456
 457         if (port->sysrq) {
 458                 for (i = 1; i < len - 1; ++i) {
 459                         if (!usb_serial_handle_sysrq_char(port, data[i])) {
 460                                 tty_insert_flip_char(&port->port, data[i],
 461                                                 tty_flag);
 462                         }
 463                 }
 464         } else {
 465                 tty_insert_flip_string_fixed_flag(&port->port, &data[1],
 466                                                         tty_flag, len - 2);
 467         }
 468
 469         tty_flip_buffer_push(&port->port);
 470 }
 471
 472 static void f81232_break_ctl(struct tty_struct *tty, int break_state)
 473 {
 474         struct usb_serial_port *port = tty->driver_data;
 475         struct f81232_private *priv = usb_get_serial_port_data(port);
 476         int status;
 477
 478         mutex_lock(&priv->lock);
 479
 480         if (break_state)
 481                 priv->shadow_lcr |= UART_LCR_SBC;
 482         else
 483                 priv->shadow_lcr &= ~UART_LCR_SBC;
 484
 485         status = f81232_set_register(port, LINE_CONTROL_REGISTER,
 486                                         priv->shadow_lcr);
 487         if (status)
 488                 dev_err(&port->dev, "set break failed: %d\n", status);
 489
 490         mutex_unlock(&priv->lock);
 491 }
 492
 493 static int f81232_find_clk(speed_t baudrate)
 494 {
 495         int idx;
 496
 497         for (idx = 0; idx < ARRAY_SIZE(baudrate_table); ++idx) {
 498                 if (baudrate <= baudrate_table[idx] &&
 499                                 baudrate_table[idx] % baudrate == 0)
 500                         return idx;
 501         }
 502
 503         return -EINVAL;
 504 }
 505
 506 static void f81232_set_baudrate(struct tty_struct *tty,
 507                                 struct usb_serial_port *port, speed_t baudrate,
 508                                 speed_t old_baudrate)
 509 {
 510         struct f81232_private *priv = usb_get_serial_port_data(port);
 511         u8 lcr;
 512         int divisor;
 513         int status = 0;
 514         int i;
 515         int idx;
 516         speed_t baud_list[] = { baudrate, old_baudrate, F81232_DEF_BAUDRATE };
 517
 518         for (i = 0; i < ARRAY_SIZE(baud_list); ++i) {
 519                 baudrate = baud_list[i];
 520                 if (baudrate == 0) {
 521                         tty_encode_baud_rate(tty, 0, 0);
 522                         return;
 523                 }
 524
 525                 idx = f81232_find_clk(baudrate);
 526                 if (idx >= 0) {
 527                         tty_encode_baud_rate(tty, baudrate, baudrate);
 528                         break;
 529                 }
 530         }
 531
 532         if (idx < 0)
 533                 return;
 534
 535         priv->baud_base = baudrate_table[idx];
 536         divisor = calc_baud_divisor(baudrate, priv->baud_base);
 537
 538         status = f81232_set_mask_register(port, F81232_CLK_REGISTER,
 539                         F81232_CLK_MASK, clock_table[idx]);
 540         if (status) {
 541                 dev_err(&port->dev, "%s failed to set CLK_REG: %d\n",
 542                         __func__, status);
 543                 return;
 544         }
 545
 546         status = f81232_get_register(port, LINE_CONTROL_REGISTER,
 547                          &lcr); /* get LCR */
 548         if (status) {
 549                 dev_err(&port->dev, "%s failed to get LCR: %d\n",
 550                         __func__, status);
 551                 return;
 552         }
 553
 554         status = f81232_set_register(port, LINE_CONTROL_REGISTER,
 555                          lcr | UART_LCR_DLAB); /* Enable DLAB */
 556         if (status) {
 557                 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
 558                         __func__, status);
 559                 return;
 560         }
 561
 562         status = f81232_set_register(port, RECEIVE_BUFFER_REGISTER,
 563                          divisor & 0x00ff); /* low */
 564         if (status) {
 565                 dev_err(&port->dev, "%s failed to set baudrate MSB: %d\n",
 566                         __func__, status);
 567                 goto reapply_lcr;
 568         }
 569
 570         status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
 571                          (divisor & 0xff00) >> 8); /* high */
 572         if (status) {
 573                 dev_err(&port->dev, "%s failed to set baudrate LSB: %d\n",
 574                         __func__, status);
 575         }
 576
 577 reapply_lcr:
 578         status = f81232_set_register(port, LINE_CONTROL_REGISTER,
 579                         lcr & ~UART_LCR_DLAB);
 580         if (status) {
 581                 dev_err(&port->dev, "%s failed to set DLAB: %d\n",
 582                         __func__, status);
 583         }
 584 }
 585
 586 static int f81232_port_enable(struct usb_serial_port *port)
 587 {
 588         u8 val;
 589         int status;
 590
 591         /* fifo on, trigger8, clear TX/RX*/
 592         val = UART_FCR_TRIGGER_8 | UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR |
 593                         UART_FCR_CLEAR_XMIT;
 594
 595         status = f81232_set_register(port, FIFO_CONTROL_REGISTER, val);
 596         if (status) {
 597                 dev_err(&port->dev, "%s failed to set FCR: %d\n",
 598                         __func__, status);
 599                 return status;
 600         }
 601
 602         /* MSR Interrupt only, LSR will read from Bulk-in odd byte */
 603         status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER,
 604                         UART_IER_MSI);
 605         if (status) {
 606                 dev_err(&port->dev, "%s failed to set IER: %d\n",
 607                         __func__, status);
 608                 return status;
 609         }
 610
 611         return 0;
 612 }
 613
 614 static int f81232_port_disable(struct usb_serial_port *port)
 615 {
 616         int status;
 617
 618         status = f81232_set_register(port, INTERRUPT_ENABLE_REGISTER, 0);
 619         if (status) {
 620                 dev_err(&port->dev, "%s failed to set IER: %d\n",
 621                         __func__, status);
 622                 return status;
 623         }
 624
 625         return 0;
 626 }
 627
 628 static void f81232_set_termios(struct tty_struct *tty,
 629                 struct usb_serial_port *port, struct ktermios *old_termios)
 630 {
 631         struct f81232_private *priv = usb_get_serial_port_data(port);
 632         u8 new_lcr = 0;
 633         int status = 0;
 634         speed_t baudrate;
 635         speed_t old_baud;
 636
 637         /* Don't change anything if nothing has changed */
 638         if (old_termios && !tty_termios_hw_change(&tty->termios, old_termios))
 639                 return;
 640
 641         if (C_BAUD(tty) == B0)
 642                 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
 643         else if (old_termios && (old_termios->c_cflag & CBAUD) == B0)
 644                 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
 645
 646         baudrate = tty_get_baud_rate(tty);
 647         if (baudrate > 0) {
 648                 if (old_termios)
 649                         old_baud = tty_termios_baud_rate(old_termios);
 650                 else
 651                         old_baud = F81232_DEF_BAUDRATE;
 652
 653                 f81232_set_baudrate(tty, port, baudrate, old_baud);
 654         }
 655
 656         if (C_PARENB(tty)) {
 657                 new_lcr |= UART_LCR_PARITY;
 658
 659                 if (!C_PARODD(tty))
 660                         new_lcr |= UART_LCR_EPAR;
 661
 662                 if (C_CMSPAR(tty))
 663                         new_lcr |= UART_LCR_SPAR;
 664         }
 665
 666         if (C_CSTOPB(tty))
 667                 new_lcr |= UART_LCR_STOP;
 668
 669         switch (C_CSIZE(tty)) {
 670         case CS5:
 671                 new_lcr |= UART_LCR_WLEN5;
 672                 break;
 673         case CS6:
 674                 new_lcr |= UART_LCR_WLEN6;
 675                 break;
 676         case CS7:
 677                 new_lcr |= UART_LCR_WLEN7;
 678                 break;
 679         default:
 680         case CS8:
 681                 new_lcr |= UART_LCR_WLEN8;
 682                 break;
 683         }
 684
 685         mutex_lock(&priv->lock);
 686
 687         new_lcr |= (priv->shadow_lcr & UART_LCR_SBC);
 688         status = f81232_set_register(port, LINE_CONTROL_REGISTER, new_lcr);
 689         if (status) {
 690                 dev_err(&port->dev, "%s failed to set LCR: %d\n",
 691                         __func__, status);
 692         }
 693
 694         priv->shadow_lcr = new_lcr;
 695
 696         mutex_unlock(&priv->lock);
 697 }
 698
 699 static int f81232_tiocmget(struct tty_struct *tty)
 700 {
 701         int r;
 702         struct usb_serial_port *port = tty->driver_data;
 703         struct f81232_private *port_priv = usb_get_serial_port_data(port);
 704         u8 mcr, msr;
 705
 706         /* force get current MSR changed state */
 707         f81232_read_msr(port);
 708
 709         mutex_lock(&port_priv->lock);
 710         mcr = port_priv->modem_control;
 711         msr = port_priv->modem_status;
 712         mutex_unlock(&port_priv->lock);
 713
 714         r = (mcr & UART_MCR_DTR ? TIOCM_DTR : 0) |
 715                 (mcr & UART_MCR_RTS ? TIOCM_RTS : 0) |
 716                 (msr & UART_MSR_CTS ? TIOCM_CTS : 0) |
 717                 (msr & UART_MSR_DCD ? TIOCM_CAR : 0) |
 718                 (msr & UART_MSR_RI ? TIOCM_RI : 0) |
 719                 (msr & UART_MSR_DSR ? TIOCM_DSR : 0);
 720
 721         return r;
 722 }
 723
 724 static int f81232_tiocmset(struct tty_struct *tty,
 725                         unsigned int set, unsigned int clear)
 726 {
 727         struct usb_serial_port *port = tty->driver_data;
 728
 729         return f81232_set_mctrl(port, set, clear);
 730 }
 731
 732 static int f81232_open(struct tty_struct *tty, struct usb_serial_port *port)
 733 {
 734         int result;
 735
 736         result = f81232_port_enable(port);
 737         if (result)
 738                 return result;
 739
 740         /* Setup termios */
 741         if (tty)
 742                 f81232_set_termios(tty, port, NULL);
 743
 744         result = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 745         if (result) {
 746                 dev_err(&port->dev, "%s - failed submitting interrupt urb,"
 747                         " error %d\n", __func__, result);
 748                 return result;
 749         }
 750
 751         result = usb_serial_generic_open(tty, port);
 752         if (result) {
 753                 usb_kill_urb(port->interrupt_in_urb);
 754                 return result;
 755         }
 756
 757         return 0;
 758 }
 759
 760 static int f81534a_open(struct tty_struct *tty, struct usb_serial_port *port)
 761 {
 762         int status;
 763         u8 mask;
 764         u8 val;
 765
 766         val = F81534A_TRIGGER_MULTIPLE_4X | F81534A_FIFO_128BYTE;
 767         mask = F81534A_TRIGGER_MASK | F81534A_FIFO_128BYTE;
 768
 769         status = f81232_set_mask_register(port, F81534A_MODE_REG, mask, val);
 770         if (status) {
 771                 dev_err(&port->dev, "failed to set MODE_REG: %d\n", status);
 772                 return status;
 773         }
 774
 775         return f81232_open(tty, port);
 776 }
 777
 778 static void f81232_close(struct usb_serial_port *port)
 779 {
 780         struct f81232_private *port_priv = usb_get_serial_port_data(port);
 781
 782         f81232_port_disable(port);
 783         usb_serial_generic_close(port);
 784         usb_kill_urb(port->interrupt_in_urb);
 785         flush_work(&port_priv->interrupt_work);
 786         flush_work(&port_priv->lsr_work);
 787 }
 788
 789 static void f81232_dtr_rts(struct usb_serial_port *port, int on)
 790 {
 791         if (on)
 792                 f81232_set_mctrl(port, TIOCM_DTR | TIOCM_RTS, 0);
 793         else
 794                 f81232_set_mctrl(port, 0, TIOCM_DTR | TIOCM_RTS);
 795 }
 796
 797 static bool f81232_tx_empty(struct usb_serial_port *port)
 798 {
 799         int status;
 800         u8 tmp;
 801
 802         status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
 803         if (!status) {
 804                 if ((tmp & UART_LSR_TEMT) != UART_LSR_TEMT)
 805                         return false;
 806         }
 807
 808         return true;
 809 }
 810
 811 static int f81232_carrier_raised(struct usb_serial_port *port)
 812 {
 813         u8 msr;
 814         struct f81232_private *priv = usb_get_serial_port_data(port);
 815
 816         mutex_lock(&priv->lock);
 817         msr = priv->modem_status;
 818         mutex_unlock(&priv->lock);
 819
 820         if (msr & UART_MSR_DCD)
 821                 return 1;
 822         return 0;
 823 }
 824
 825 static void f81232_get_serial(struct tty_struct *tty, struct serial_struct *ss)
 826 {
 827         struct usb_serial_port *port = tty->driver_data;
 828         struct f81232_private *priv = usb_get_serial_port_data(port);
 829
 830         ss->baud_base = priv->baud_base;
 831 }
 832
 833 static void  f81232_interrupt_work(struct work_struct *work)
 834 {
 835         struct f81232_private *priv =
 836                 container_of(work, struct f81232_private, interrupt_work);
 837
 838         f81232_read_msr(priv->port);
 839 }
 840
 841 static void f81232_lsr_worker(struct work_struct *work)
 842 {
 843         struct f81232_private *priv;
 844         struct usb_serial_port *port;
 845         int status;
 846         u8 tmp;
 847
 848         priv = container_of(work, struct f81232_private, lsr_work);
 849         port = priv->port;
 850
 851         status = f81232_get_register(port, LINE_STATUS_REGISTER, &tmp);
 852         if (status)
 853                 dev_warn(&port->dev, "read LSR failed: %d\n", status);
 854 }
 855
 856 static int f81534a_ctrl_set_register(struct usb_interface *intf, u16 reg,
 857                                         u16 size, void *val)
 858 {
 859         struct usb_device *dev = interface_to_usbdev(intf);
 860         int retry = F81534A_ACCESS_REG_RETRY;
 861         int status;
 862         u8 *tmp;
 863
 864         tmp = kmemdup(val, size, GFP_KERNEL);
 865         if (!tmp)
 866                 return -ENOMEM;
 867
 868         while (retry--) {
 869                 status = usb_control_msg(dev,
 870                                         usb_sndctrlpipe(dev, 0),
 871                                         F81232_REGISTER_REQUEST,
 872                                         F81232_SET_REGISTER,
 873                                         reg,
 874                                         0,
 875                                         tmp,
 876                                         size,
 877                                         USB_CTRL_SET_TIMEOUT);
 878                 if (status < 0) {
 879                         status = usb_translate_errors(status);
 880                         if (status == -EIO)
 881                                 continue;
 882                 } else {
 883                         status = 0;
 884                 }
 885
 886                 break;
 887         }
 888
 889         if (status) {
 890                 dev_err(&intf->dev, "failed to set register 0x%x: %d\n",
 891                                 reg, status);
 892         }
 893
 894         kfree(tmp);
 895         return status;
 896 }
 897
 898 static int f81534a_ctrl_enable_all_ports(struct usb_interface *intf, bool en)
 899 {
 900         unsigned char enable[2] = {0};
 901         int status;
 902
 903         /*
 904          * Enable all available serial ports, define as following:
 905          * bit 15       : Reset behavior (when HUB got soft reset)
 906          *                      0: maintain all serial port enabled state.
 907          *                      1: disable all serial port.
 908          * bit 0~11     : Serial port enable bit.
 909          */
 910         if (en) {
 911                 enable[0] = 0xff;
 912                 enable[1] = 0x8f;
 913         }
 914
 915         status = f81534a_ctrl_set_register(intf, F81534A_CTRL_CMD_ENABLE_PORT,
 916                         sizeof(enable), enable);
 917         if (status)
 918                 dev_err(&intf->dev, "failed to enable ports: %d\n", status);
 919
 920         return status;
 921 }
 922
 923 static int f81534a_ctrl_probe(struct usb_interface *intf,
 924                                 const struct usb_device_id *id)
 925 {
 926         return f81534a_ctrl_enable_all_ports(intf, true);
 927 }
 928
 929 static void f81534a_ctrl_disconnect(struct usb_interface *intf)
 930 {
 931         f81534a_ctrl_enable_all_ports(intf, false);
 932 }
 933
 934 static int f81534a_ctrl_resume(struct usb_interface *intf)
 935 {
 936         return f81534a_ctrl_enable_all_ports(intf, true);
 937 }
 938
 939 static int f81232_port_probe(struct usb_serial_port *port)
 940 {
 941         struct f81232_private *priv;
 942
 943         priv = devm_kzalloc(&port->dev, sizeof(*priv), GFP_KERNEL);
 944         if (!priv)
 945                 return -ENOMEM;
 946
 947         mutex_init(&priv->lock);
 948         INIT_WORK(&priv->interrupt_work,  f81232_interrupt_work);
 949         INIT_WORK(&priv->lsr_work, f81232_lsr_worker);
 950
 951         usb_set_serial_port_data(port, priv);
 952
 953         priv->port = port;
 954
 955         return 0;
 956 }
 957
 958 static int f81534a_port_probe(struct usb_serial_port *port)
 959 {
 960         int status;
 961
 962         /* tri-state with pull-high, default RS232 Mode */
 963         status = f81232_set_register(port, F81534A_GPIO_REG,
 964                                         F81534A_GPIO_MODE2_DIR);
 965         if (status)
 966                 return status;
 967
 968         return f81232_port_probe(port);
 969 }
 970
 971 static int f81232_suspend(struct usb_serial *serial, pm_message_t message)
 972 {
 973         struct usb_serial_port *port = serial->port[0];
 974         struct f81232_private *port_priv = usb_get_serial_port_data(port);
 975         int i;
 976
 977         for (i = 0; i < ARRAY_SIZE(port->read_urbs); ++i)
 978                 usb_kill_urb(port->read_urbs[i]);
 979
 980         usb_kill_urb(port->interrupt_in_urb);
 981
 982         if (port_priv) {
 983                 flush_work(&port_priv->interrupt_work);
 984                 flush_work(&port_priv->lsr_work);
 985         }
 986
 987         return 0;
 988 }
 989
 990 static int f81232_resume(struct usb_serial *serial)
 991 {
 992         struct usb_serial_port *port = serial->port[0];
 993         int result;
 994
 995         if (tty_port_initialized(&port->port)) {
 996                 result = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
 997                 if (result) {
 998                         dev_err(&port->dev, "submit interrupt urb failed: %d\n",
 999                                         result);
1000                         return result;
1001                 }
1002         }
1003
1004         return usb_serial_generic_resume(serial);
1005 }
1006
1007 static struct usb_serial_driver f81232_device = {
1008         .driver = {
1009                 .owner =        THIS_MODULE,
1010                 .name =         "f81232",
1011         },
1012         .id_table =             f81232_id_table,
1013         .num_ports =            1,
1014         .bulk_in_size =         256,
1015         .bulk_out_size =        256,
1016         .open =                 f81232_open,
1017         .close =                f81232_close,
1018         .dtr_rts =              f81232_dtr_rts,
1019         .carrier_raised =       f81232_carrier_raised,
1020         .get_serial =           f81232_get_serial,
1021         .break_ctl =            f81232_break_ctl,
1022         .set_termios =          f81232_set_termios,
1023         .tiocmget =             f81232_tiocmget,
1024         .tiocmset =             f81232_tiocmset,
1025         .tiocmiwait =           usb_serial_generic_tiocmiwait,
1026         .tx_empty =             f81232_tx_empty,
1027         .process_read_urb =     f81232_process_read_urb,
1028         .read_int_callback =    f81232_read_int_callback,
1029         .port_probe =           f81232_port_probe,
1030         .suspend =              f81232_suspend,
1031         .resume =               f81232_resume,
1032 };
1033
1034 static struct usb_serial_driver f81534a_device = {
1035         .driver = {
1036                 .owner =        THIS_MODULE,
1037                 .name =         "f81534a",
1038         },
1039         .id_table =             f81534a_id_table,
1040         .num_ports =            1,
1041         .open =                 f81534a_open,
1042         .close =                f81232_close,
1043         .dtr_rts =              f81232_dtr_rts,
1044         .carrier_raised =       f81232_carrier_raised,
1045         .get_serial =           f81232_get_serial,
1046         .break_ctl =            f81232_break_ctl,
1047         .set_termios =          f81232_set_termios,
1048         .tiocmget =             f81232_tiocmget,
1049         .tiocmset =             f81232_tiocmset,
1050         .tiocmiwait =           usb_serial_generic_tiocmiwait,
1051         .tx_empty =             f81232_tx_empty,
1052         .process_read_urb =     f81534a_process_read_urb,
1053         .read_int_callback =    f81232_read_int_callback,
1054         .port_probe =           f81534a_port_probe,
1055         .suspend =              f81232_suspend,
1056         .resume =               f81232_resume,
1057 };
1058
1059 static struct usb_serial_driver * const serial_drivers[] = {
1060         &f81232_device,
1061         &f81534a_device,
1062         NULL,
1063 };
1064
1065 static struct usb_driver f81534a_ctrl_driver = {
1066         .name =         "f81534a_ctrl",
1067         .id_table =     f81534a_ctrl_id_table,
1068         .probe =        f81534a_ctrl_probe,
1069         .disconnect =   f81534a_ctrl_disconnect,
1070         .resume =       f81534a_ctrl_resume,
1071 };
1072
1073 static int __init f81232_init(void)
1074 {
1075         int status;
1076
1077         status = usb_register_driver(&f81534a_ctrl_driver, THIS_MODULE,
1078                         KBUILD_MODNAME);
1079         if (status)
1080                 return status;
1081
1082         status = usb_serial_register_drivers(serial_drivers, KBUILD_MODNAME,
1083                         combined_id_table);
1084         if (status) {
1085                 usb_deregister(&f81534a_ctrl_driver);
1086                 return status;
1087         }
1088
1089         return 0;
1090 }
1091
1092 static void __exit f81232_exit(void)
1093 {
1094         usb_serial_deregister_drivers(serial_drivers);
1095         usb_deregister(&f81534a_ctrl_driver);
1096 }
1097
1098 module_init(f81232_init);
1099 module_exit(f81232_exit);
1100
1101 MODULE_DESCRIPTION("Fintek F81232/532A/534A/535/536 USB to serial driver");
1102 MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
1103 MODULE_AUTHOR("Peter Hong <peter_hong@fintek.com.tw>");
1104 MODULE_LICENSE("GPL v2");