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