1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * 4 * Copyright (C) 2008 Christian Pellegrin <chripell@evolware.org> 5 * 6 * Notes: the MAX3100 doesn't provide an interrupt on CTS so we have 7 * to use polling for flow control. TX empty IRQ is unusable, since 8 * writing conf clears FIFO buffer and we cannot have this interrupt 9 * always asking us for attention. 10 * 11 * Example platform data: 12 13 static struct plat_max3100 max3100_plat_data = { 14 .loopback = 0, 15 .crystal = 0, 16 .poll_time = 100, 17 }; 18 19 static struct spi_board_info spi_board_info[] = { 20 { 21 .modalias = "max3100", 22 .platform_data = &max3100_plat_data, 23 .irq = IRQ_EINT12, 24 .max_speed_hz = 5*1000*1000, 25 .chip_select = 0, 26 }, 27 }; 28 29 * The initial minor number is 209 in the low-density serial port: 30 * mknod /dev/ttyMAX0 c 204 209 31 */ 32 33 #define MAX3100_MAJOR 204 34 #define MAX3100_MINOR 209 35 /* 4 MAX3100s should be enough for everyone */ 36 #define MAX_MAX3100 4 37 38 #include <linux/delay.h> 39 #include <linux/slab.h> 40 #include <linux/device.h> 41 #include <linux/module.h> 42 #include <linux/serial_core.h> 43 #include <linux/serial.h> 44 #include <linux/spi/spi.h> 45 #include <linux/freezer.h> 46 #include <linux/tty.h> 47 #include <linux/tty_flip.h> 48 49 #include <linux/serial_max3100.h> 50 51 #define MAX3100_C (1<<14) 52 #define MAX3100_D (0<<14) 53 #define MAX3100_W (1<<15) 54 #define MAX3100_RX (0<<15) 55 56 #define MAX3100_WC (MAX3100_W | MAX3100_C) 57 #define MAX3100_RC (MAX3100_RX | MAX3100_C) 58 #define MAX3100_WD (MAX3100_W | MAX3100_D) 59 #define MAX3100_RD (MAX3100_RX | MAX3100_D) 60 #define MAX3100_CMD (3 << 14) 61 62 #define MAX3100_T (1<<14) 63 #define MAX3100_R (1<<15) 64 65 #define MAX3100_FEN (1<<13) 66 #define MAX3100_SHDN (1<<12) 67 #define MAX3100_TM (1<<11) 68 #define MAX3100_RM (1<<10) 69 #define MAX3100_PM (1<<9) 70 #define MAX3100_RAM (1<<8) 71 #define MAX3100_IR (1<<7) 72 #define MAX3100_ST (1<<6) 73 #define MAX3100_PE (1<<5) 74 #define MAX3100_L (1<<4) 75 #define MAX3100_BAUD (0xf) 76 77 #define MAX3100_TE (1<<10) 78 #define MAX3100_RAFE (1<<10) 79 #define MAX3100_RTS (1<<9) 80 #define MAX3100_CTS (1<<9) 81 #define MAX3100_PT (1<<8) 82 #define MAX3100_DATA (0xff) 83 84 #define MAX3100_RT (MAX3100_R | MAX3100_T) 85 #define MAX3100_RTC (MAX3100_RT | MAX3100_CTS | MAX3100_RAFE) 86 87 /* the following simulate a status reg for ignore_status_mask */ 88 #define MAX3100_STATUS_PE 1 89 #define MAX3100_STATUS_FE 2 90 #define MAX3100_STATUS_OE 4 91 92 struct max3100_port { 93 struct uart_port port; 94 struct spi_device *spi; 95 96 int cts; /* last CTS received for flow ctrl */ 97 int tx_empty; /* last TX empty bit */ 98 99 spinlock_t conf_lock; /* shared data */ 100 int conf_commit; /* need to make changes */ 101 int conf; /* configuration for the MAX31000 102 * (bits 0-7, bits 8-11 are irqs) */ 103 int rts_commit; /* need to change rts */ 104 int rts; /* rts status */ 105 int baud; /* current baud rate */ 106 107 int parity; /* keeps track if we should send parity */ 108 #define MAX3100_PARITY_ON 1 109 #define MAX3100_PARITY_ODD 2 110 #define MAX3100_7BIT 4 111 int rx_enabled; /* if we should rx chars */ 112 113 int irq; /* irq assigned to the max3100 */ 114 115 int minor; /* minor number */ 116 int crystal; /* 1 if 3.6864Mhz crystal 0 for 1.8432 */ 117 int loopback; /* 1 if we are in loopback mode */ 118 119 /* for handling irqs: need workqueue since we do spi_sync */ 120 struct workqueue_struct *workqueue; 121 struct work_struct work; 122 /* set to 1 to make the workhandler exit as soon as possible */ 123 int force_end_work; 124 /* need to know we are suspending to avoid deadlock on workqueue */ 125 int suspending; 126 127 /* hook for suspending MAX3100 via dedicated pin */ 128 void (*max3100_hw_suspend) (int suspend); 129 130 /* poll time (in ms) for ctrl lines */ 131 int poll_time; 132 /* and its timer */ 133 struct timer_list timer; 134 }; 135 136 static struct max3100_port *max3100s[MAX_MAX3100]; /* the chips */ 137 static DEFINE_MUTEX(max3100s_lock); /* race on probe */ 138 139 static int max3100_do_parity(struct max3100_port *s, u16 c) 140 { 141 int parity; 142 143 if (s->parity & MAX3100_PARITY_ODD) 144 parity = 1; 145 else 146 parity = 0; 147 148 if (s->parity & MAX3100_7BIT) 149 c &= 0x7f; 150 else 151 c &= 0xff; 152 153 parity = parity ^ (hweight8(c) & 1); 154 return parity; 155 } 156 157 static int max3100_check_parity(struct max3100_port *s, u16 c) 158 { 159 return max3100_do_parity(s, c) == ((c >> 8) & 1); 160 } 161 162 static void max3100_calc_parity(struct max3100_port *s, u16 *c) 163 { 164 if (s->parity & MAX3100_7BIT) 165 *c &= 0x7f; 166 else 167 *c &= 0xff; 168 169 if (s->parity & MAX3100_PARITY_ON) 170 *c |= max3100_do_parity(s, *c) << 8; 171 } 172 173 static void max3100_work(struct work_struct *w); 174 175 static void max3100_dowork(struct max3100_port *s) 176 { 177 if (!s->force_end_work && !freezing(current) && !s->suspending) 178 queue_work(s->workqueue, &s->work); 179 } 180 181 static void max3100_timeout(struct timer_list *t) 182 { 183 struct max3100_port *s = from_timer(s, t, timer); 184 185 if (s->port.state) { 186 max3100_dowork(s); 187 mod_timer(&s->timer, jiffies + s->poll_time); 188 } 189 } 190 191 static int max3100_sr(struct max3100_port *s, u16 tx, u16 *rx) 192 { 193 struct spi_message message; 194 u16 etx, erx; 195 int status; 196 struct spi_transfer tran = { 197 .tx_buf = &etx, 198 .rx_buf = &erx, 199 .len = 2, 200 }; 201 202 etx = cpu_to_be16(tx); 203 spi_message_init(&message); 204 spi_message_add_tail(&tran, &message); 205 status = spi_sync(s->spi, &message); 206 if (status) { 207 dev_warn(&s->spi->dev, "error while calling spi_sync\n"); 208 return -EIO; 209 } 210 *rx = be16_to_cpu(erx); 211 s->tx_empty = (*rx & MAX3100_T) > 0; 212 dev_dbg(&s->spi->dev, "%04x - %04x\n", tx, *rx); 213 return 0; 214 } 215 216 static int max3100_handlerx(struct max3100_port *s, u16 rx) 217 { 218 unsigned int ch, flg, status = 0; 219 int ret = 0, cts; 220 221 if (rx & MAX3100_R && s->rx_enabled) { 222 dev_dbg(&s->spi->dev, "%s\n", __func__); 223 ch = rx & (s->parity & MAX3100_7BIT ? 0x7f : 0xff); 224 if (rx & MAX3100_RAFE) { 225 s->port.icount.frame++; 226 flg = TTY_FRAME; 227 status |= MAX3100_STATUS_FE; 228 } else { 229 if (s->parity & MAX3100_PARITY_ON) { 230 if (max3100_check_parity(s, rx)) { 231 s->port.icount.rx++; 232 flg = TTY_NORMAL; 233 } else { 234 s->port.icount.parity++; 235 flg = TTY_PARITY; 236 status |= MAX3100_STATUS_PE; 237 } 238 } else { 239 s->port.icount.rx++; 240 flg = TTY_NORMAL; 241 } 242 } 243 uart_insert_char(&s->port, status, MAX3100_STATUS_OE, ch, flg); 244 ret = 1; 245 } 246 247 cts = (rx & MAX3100_CTS) > 0; 248 if (s->cts != cts) { 249 s->cts = cts; 250 uart_handle_cts_change(&s->port, cts ? TIOCM_CTS : 0); 251 } 252 253 return ret; 254 } 255 256 static void max3100_work(struct work_struct *w) 257 { 258 struct max3100_port *s = container_of(w, struct max3100_port, work); 259 int rxchars; 260 u16 tx, rx; 261 int conf, cconf, crts; 262 struct circ_buf *xmit = &s->port.state->xmit; 263 264 dev_dbg(&s->spi->dev, "%s\n", __func__); 265 266 rxchars = 0; 267 do { 268 spin_lock(&s->conf_lock); 269 conf = s->conf; 270 cconf = s->conf_commit; 271 s->conf_commit = 0; 272 crts = s->rts_commit; 273 s->rts_commit = 0; 274 spin_unlock(&s->conf_lock); 275 if (cconf) 276 max3100_sr(s, MAX3100_WC | conf, &rx); 277 if (crts) { 278 max3100_sr(s, MAX3100_WD | MAX3100_TE | 279 (s->rts ? MAX3100_RTS : 0), &rx); 280 rxchars += max3100_handlerx(s, rx); 281 } 282 283 max3100_sr(s, MAX3100_RD, &rx); 284 rxchars += max3100_handlerx(s, rx); 285 286 if (rx & MAX3100_T) { 287 tx = 0xffff; 288 if (s->port.x_char) { 289 tx = s->port.x_char; 290 s->port.icount.tx++; 291 s->port.x_char = 0; 292 } else if (!uart_circ_empty(xmit) && 293 !uart_tx_stopped(&s->port)) { 294 tx = xmit->buf[xmit->tail]; 295 uart_xmit_advance(&s->port, 1); 296 } 297 if (tx != 0xffff) { 298 max3100_calc_parity(s, &tx); 299 tx |= MAX3100_WD | (s->rts ? MAX3100_RTS : 0); 300 max3100_sr(s, tx, &rx); 301 rxchars += max3100_handlerx(s, rx); 302 } 303 } 304 305 if (rxchars > 16) { 306 tty_flip_buffer_push(&s->port.state->port); 307 rxchars = 0; 308 } 309 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 310 uart_write_wakeup(&s->port); 311 312 } while (!s->force_end_work && 313 !freezing(current) && 314 ((rx & MAX3100_R) || 315 (!uart_circ_empty(xmit) && 316 !uart_tx_stopped(&s->port)))); 317 318 if (rxchars > 0) 319 tty_flip_buffer_push(&s->port.state->port); 320 } 321 322 static irqreturn_t max3100_irq(int irqno, void *dev_id) 323 { 324 struct max3100_port *s = dev_id; 325 326 dev_dbg(&s->spi->dev, "%s\n", __func__); 327 328 max3100_dowork(s); 329 return IRQ_HANDLED; 330 } 331 332 static void max3100_enable_ms(struct uart_port *port) 333 { 334 struct max3100_port *s = container_of(port, 335 struct max3100_port, 336 port); 337 338 if (s->poll_time > 0) 339 mod_timer(&s->timer, jiffies); 340 dev_dbg(&s->spi->dev, "%s\n", __func__); 341 } 342 343 static void max3100_start_tx(struct uart_port *port) 344 { 345 struct max3100_port *s = container_of(port, 346 struct max3100_port, 347 port); 348 349 dev_dbg(&s->spi->dev, "%s\n", __func__); 350 351 max3100_dowork(s); 352 } 353 354 static void max3100_stop_rx(struct uart_port *port) 355 { 356 struct max3100_port *s = container_of(port, 357 struct max3100_port, 358 port); 359 360 dev_dbg(&s->spi->dev, "%s\n", __func__); 361 362 s->rx_enabled = 0; 363 spin_lock(&s->conf_lock); 364 s->conf &= ~MAX3100_RM; 365 s->conf_commit = 1; 366 spin_unlock(&s->conf_lock); 367 max3100_dowork(s); 368 } 369 370 static unsigned int max3100_tx_empty(struct uart_port *port) 371 { 372 struct max3100_port *s = container_of(port, 373 struct max3100_port, 374 port); 375 376 dev_dbg(&s->spi->dev, "%s\n", __func__); 377 378 /* may not be truly up-to-date */ 379 max3100_dowork(s); 380 return s->tx_empty; 381 } 382 383 static unsigned int max3100_get_mctrl(struct uart_port *port) 384 { 385 struct max3100_port *s = container_of(port, 386 struct max3100_port, 387 port); 388 389 dev_dbg(&s->spi->dev, "%s\n", __func__); 390 391 /* may not be truly up-to-date */ 392 max3100_dowork(s); 393 /* always assert DCD and DSR since these lines are not wired */ 394 return (s->cts ? TIOCM_CTS : 0) | TIOCM_DSR | TIOCM_CAR; 395 } 396 397 static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl) 398 { 399 struct max3100_port *s = container_of(port, 400 struct max3100_port, 401 port); 402 int rts; 403 404 dev_dbg(&s->spi->dev, "%s\n", __func__); 405 406 rts = (mctrl & TIOCM_RTS) > 0; 407 408 spin_lock(&s->conf_lock); 409 if (s->rts != rts) { 410 s->rts = rts; 411 s->rts_commit = 1; 412 max3100_dowork(s); 413 } 414 spin_unlock(&s->conf_lock); 415 } 416 417 static void 418 max3100_set_termios(struct uart_port *port, struct ktermios *termios, 419 const struct ktermios *old) 420 { 421 struct max3100_port *s = container_of(port, 422 struct max3100_port, 423 port); 424 int baud = 0; 425 unsigned cflag; 426 u32 param_new, param_mask, parity = 0; 427 428 dev_dbg(&s->spi->dev, "%s\n", __func__); 429 430 cflag = termios->c_cflag; 431 param_mask = 0; 432 433 baud = tty_termios_baud_rate(termios); 434 param_new = s->conf & MAX3100_BAUD; 435 switch (baud) { 436 case 300: 437 if (s->crystal) 438 baud = s->baud; 439 else 440 param_new = 15; 441 break; 442 case 600: 443 param_new = 14 + s->crystal; 444 break; 445 case 1200: 446 param_new = 13 + s->crystal; 447 break; 448 case 2400: 449 param_new = 12 + s->crystal; 450 break; 451 case 4800: 452 param_new = 11 + s->crystal; 453 break; 454 case 9600: 455 param_new = 10 + s->crystal; 456 break; 457 case 19200: 458 param_new = 9 + s->crystal; 459 break; 460 case 38400: 461 param_new = 8 + s->crystal; 462 break; 463 case 57600: 464 param_new = 1 + s->crystal; 465 break; 466 case 115200: 467 param_new = 0 + s->crystal; 468 break; 469 case 230400: 470 if (s->crystal) 471 param_new = 0; 472 else 473 baud = s->baud; 474 break; 475 default: 476 baud = s->baud; 477 } 478 tty_termios_encode_baud_rate(termios, baud, baud); 479 s->baud = baud; 480 param_mask |= MAX3100_BAUD; 481 482 if ((cflag & CSIZE) == CS8) { 483 param_new &= ~MAX3100_L; 484 parity &= ~MAX3100_7BIT; 485 } else { 486 param_new |= MAX3100_L; 487 parity |= MAX3100_7BIT; 488 cflag = (cflag & ~CSIZE) | CS7; 489 } 490 param_mask |= MAX3100_L; 491 492 if (cflag & CSTOPB) 493 param_new |= MAX3100_ST; 494 else 495 param_new &= ~MAX3100_ST; 496 param_mask |= MAX3100_ST; 497 498 if (cflag & PARENB) { 499 param_new |= MAX3100_PE; 500 parity |= MAX3100_PARITY_ON; 501 } else { 502 param_new &= ~MAX3100_PE; 503 parity &= ~MAX3100_PARITY_ON; 504 } 505 param_mask |= MAX3100_PE; 506 507 if (cflag & PARODD) 508 parity |= MAX3100_PARITY_ODD; 509 else 510 parity &= ~MAX3100_PARITY_ODD; 511 512 /* mask termios capabilities we don't support */ 513 cflag &= ~CMSPAR; 514 termios->c_cflag = cflag; 515 516 s->port.ignore_status_mask = 0; 517 if (termios->c_iflag & IGNPAR) 518 s->port.ignore_status_mask |= 519 MAX3100_STATUS_PE | MAX3100_STATUS_FE | 520 MAX3100_STATUS_OE; 521 522 if (s->poll_time > 0) 523 del_timer_sync(&s->timer); 524 525 uart_update_timeout(port, termios->c_cflag, baud); 526 527 spin_lock(&s->conf_lock); 528 s->conf = (s->conf & ~param_mask) | (param_new & param_mask); 529 s->conf_commit = 1; 530 s->parity = parity; 531 spin_unlock(&s->conf_lock); 532 max3100_dowork(s); 533 534 if (UART_ENABLE_MS(&s->port, termios->c_cflag)) 535 max3100_enable_ms(&s->port); 536 } 537 538 static void max3100_shutdown(struct uart_port *port) 539 { 540 struct max3100_port *s = container_of(port, 541 struct max3100_port, 542 port); 543 544 dev_dbg(&s->spi->dev, "%s\n", __func__); 545 546 if (s->suspending) 547 return; 548 549 s->force_end_work = 1; 550 551 if (s->poll_time > 0) 552 del_timer_sync(&s->timer); 553 554 if (s->workqueue) { 555 destroy_workqueue(s->workqueue); 556 s->workqueue = NULL; 557 } 558 if (s->irq) 559 free_irq(s->irq, s); 560 561 /* set shutdown mode to save power */ 562 if (s->max3100_hw_suspend) 563 s->max3100_hw_suspend(1); 564 else { 565 u16 tx, rx; 566 567 tx = MAX3100_WC | MAX3100_SHDN; 568 max3100_sr(s, tx, &rx); 569 } 570 } 571 572 static int max3100_startup(struct uart_port *port) 573 { 574 struct max3100_port *s = container_of(port, 575 struct max3100_port, 576 port); 577 char b[12]; 578 579 dev_dbg(&s->spi->dev, "%s\n", __func__); 580 581 s->conf = MAX3100_RM; 582 s->baud = s->crystal ? 230400 : 115200; 583 s->rx_enabled = 1; 584 585 if (s->suspending) 586 return 0; 587 588 s->force_end_work = 0; 589 s->parity = 0; 590 s->rts = 0; 591 592 sprintf(b, "max3100-%d", s->minor); 593 s->workqueue = create_freezable_workqueue(b); 594 if (!s->workqueue) { 595 dev_warn(&s->spi->dev, "cannot create workqueue\n"); 596 return -EBUSY; 597 } 598 INIT_WORK(&s->work, max3100_work); 599 600 if (request_irq(s->irq, max3100_irq, 601 IRQF_TRIGGER_FALLING, "max3100", s) < 0) { 602 dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq); 603 s->irq = 0; 604 destroy_workqueue(s->workqueue); 605 s->workqueue = NULL; 606 return -EBUSY; 607 } 608 609 if (s->loopback) { 610 u16 tx, rx; 611 tx = 0x4001; 612 max3100_sr(s, tx, &rx); 613 } 614 615 if (s->max3100_hw_suspend) 616 s->max3100_hw_suspend(0); 617 s->conf_commit = 1; 618 max3100_dowork(s); 619 /* wait for clock to settle */ 620 msleep(50); 621 622 max3100_enable_ms(&s->port); 623 624 return 0; 625 } 626 627 static const char *max3100_type(struct uart_port *port) 628 { 629 struct max3100_port *s = container_of(port, 630 struct max3100_port, 631 port); 632 633 dev_dbg(&s->spi->dev, "%s\n", __func__); 634 635 return s->port.type == PORT_MAX3100 ? "MAX3100" : NULL; 636 } 637 638 static void max3100_release_port(struct uart_port *port) 639 { 640 struct max3100_port *s = container_of(port, 641 struct max3100_port, 642 port); 643 644 dev_dbg(&s->spi->dev, "%s\n", __func__); 645 } 646 647 static void max3100_config_port(struct uart_port *port, int flags) 648 { 649 struct max3100_port *s = container_of(port, 650 struct max3100_port, 651 port); 652 653 dev_dbg(&s->spi->dev, "%s\n", __func__); 654 655 if (flags & UART_CONFIG_TYPE) 656 s->port.type = PORT_MAX3100; 657 } 658 659 static int max3100_verify_port(struct uart_port *port, 660 struct serial_struct *ser) 661 { 662 struct max3100_port *s = container_of(port, 663 struct max3100_port, 664 port); 665 int ret = -EINVAL; 666 667 dev_dbg(&s->spi->dev, "%s\n", __func__); 668 669 if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3100) 670 ret = 0; 671 return ret; 672 } 673 674 static void max3100_stop_tx(struct uart_port *port) 675 { 676 struct max3100_port *s = container_of(port, 677 struct max3100_port, 678 port); 679 680 dev_dbg(&s->spi->dev, "%s\n", __func__); 681 } 682 683 static int max3100_request_port(struct uart_port *port) 684 { 685 struct max3100_port *s = container_of(port, 686 struct max3100_port, 687 port); 688 689 dev_dbg(&s->spi->dev, "%s\n", __func__); 690 return 0; 691 } 692 693 static void max3100_break_ctl(struct uart_port *port, int break_state) 694 { 695 struct max3100_port *s = container_of(port, 696 struct max3100_port, 697 port); 698 699 dev_dbg(&s->spi->dev, "%s\n", __func__); 700 } 701 702 static const struct uart_ops max3100_ops = { 703 .tx_empty = max3100_tx_empty, 704 .set_mctrl = max3100_set_mctrl, 705 .get_mctrl = max3100_get_mctrl, 706 .stop_tx = max3100_stop_tx, 707 .start_tx = max3100_start_tx, 708 .stop_rx = max3100_stop_rx, 709 .enable_ms = max3100_enable_ms, 710 .break_ctl = max3100_break_ctl, 711 .startup = max3100_startup, 712 .shutdown = max3100_shutdown, 713 .set_termios = max3100_set_termios, 714 .type = max3100_type, 715 .release_port = max3100_release_port, 716 .request_port = max3100_request_port, 717 .config_port = max3100_config_port, 718 .verify_port = max3100_verify_port, 719 }; 720 721 static struct uart_driver max3100_uart_driver = { 722 .owner = THIS_MODULE, 723 .driver_name = "ttyMAX", 724 .dev_name = "ttyMAX", 725 .major = MAX3100_MAJOR, 726 .minor = MAX3100_MINOR, 727 .nr = MAX_MAX3100, 728 }; 729 static int uart_driver_registered; 730 731 static int max3100_probe(struct spi_device *spi) 732 { 733 int i, retval; 734 struct plat_max3100 *pdata; 735 u16 tx, rx; 736 737 mutex_lock(&max3100s_lock); 738 739 if (!uart_driver_registered) { 740 uart_driver_registered = 1; 741 retval = uart_register_driver(&max3100_uart_driver); 742 if (retval) { 743 printk(KERN_ERR "Couldn't register max3100 uart driver\n"); 744 mutex_unlock(&max3100s_lock); 745 return retval; 746 } 747 } 748 749 for (i = 0; i < MAX_MAX3100; i++) 750 if (!max3100s[i]) 751 break; 752 if (i == MAX_MAX3100) { 753 dev_warn(&spi->dev, "too many MAX3100 chips\n"); 754 mutex_unlock(&max3100s_lock); 755 return -ENOMEM; 756 } 757 758 max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL); 759 if (!max3100s[i]) { 760 dev_warn(&spi->dev, 761 "kmalloc for max3100 structure %d failed!\n", i); 762 mutex_unlock(&max3100s_lock); 763 return -ENOMEM; 764 } 765 max3100s[i]->spi = spi; 766 max3100s[i]->irq = spi->irq; 767 spin_lock_init(&max3100s[i]->conf_lock); 768 spi_set_drvdata(spi, max3100s[i]); 769 pdata = dev_get_platdata(&spi->dev); 770 max3100s[i]->crystal = pdata->crystal; 771 max3100s[i]->loopback = pdata->loopback; 772 max3100s[i]->poll_time = msecs_to_jiffies(pdata->poll_time); 773 if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0) 774 max3100s[i]->poll_time = 1; 775 max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend; 776 max3100s[i]->minor = i; 777 timer_setup(&max3100s[i]->timer, max3100_timeout, 0); 778 779 dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i); 780 max3100s[i]->port.irq = max3100s[i]->irq; 781 max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200; 782 max3100s[i]->port.fifosize = 16; 783 max3100s[i]->port.ops = &max3100_ops; 784 max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; 785 max3100s[i]->port.line = i; 786 max3100s[i]->port.type = PORT_MAX3100; 787 max3100s[i]->port.dev = &spi->dev; 788 retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port); 789 if (retval < 0) 790 dev_warn(&spi->dev, 791 "uart_add_one_port failed for line %d with error %d\n", 792 i, retval); 793 794 /* set shutdown mode to save power. Will be woken-up on open */ 795 if (max3100s[i]->max3100_hw_suspend) 796 max3100s[i]->max3100_hw_suspend(1); 797 else { 798 tx = MAX3100_WC | MAX3100_SHDN; 799 max3100_sr(max3100s[i], tx, &rx); 800 } 801 mutex_unlock(&max3100s_lock); 802 return 0; 803 } 804 805 static void max3100_remove(struct spi_device *spi) 806 { 807 struct max3100_port *s = spi_get_drvdata(spi); 808 int i; 809 810 mutex_lock(&max3100s_lock); 811 812 /* find out the index for the chip we are removing */ 813 for (i = 0; i < MAX_MAX3100; i++) 814 if (max3100s[i] == s) { 815 dev_dbg(&spi->dev, "%s: removing port %d\n", __func__, i); 816 uart_remove_one_port(&max3100_uart_driver, &max3100s[i]->port); 817 kfree(max3100s[i]); 818 max3100s[i] = NULL; 819 break; 820 } 821 822 WARN_ON(i == MAX_MAX3100); 823 824 /* check if this is the last chip we have */ 825 for (i = 0; i < MAX_MAX3100; i++) 826 if (max3100s[i]) { 827 mutex_unlock(&max3100s_lock); 828 return; 829 } 830 pr_debug("removing max3100 driver\n"); 831 uart_unregister_driver(&max3100_uart_driver); 832 833 mutex_unlock(&max3100s_lock); 834 } 835 836 #ifdef CONFIG_PM_SLEEP 837 838 static int max3100_suspend(struct device *dev) 839 { 840 struct max3100_port *s = dev_get_drvdata(dev); 841 842 dev_dbg(&s->spi->dev, "%s\n", __func__); 843 844 disable_irq(s->irq); 845 846 s->suspending = 1; 847 uart_suspend_port(&max3100_uart_driver, &s->port); 848 849 if (s->max3100_hw_suspend) 850 s->max3100_hw_suspend(1); 851 else { 852 /* no HW suspend, so do SW one */ 853 u16 tx, rx; 854 855 tx = MAX3100_WC | MAX3100_SHDN; 856 max3100_sr(s, tx, &rx); 857 } 858 return 0; 859 } 860 861 static int max3100_resume(struct device *dev) 862 { 863 struct max3100_port *s = dev_get_drvdata(dev); 864 865 dev_dbg(&s->spi->dev, "%s\n", __func__); 866 867 if (s->max3100_hw_suspend) 868 s->max3100_hw_suspend(0); 869 uart_resume_port(&max3100_uart_driver, &s->port); 870 s->suspending = 0; 871 872 enable_irq(s->irq); 873 874 s->conf_commit = 1; 875 if (s->workqueue) 876 max3100_dowork(s); 877 878 return 0; 879 } 880 881 static SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume); 882 #define MAX3100_PM_OPS (&max3100_pm_ops) 883 884 #else 885 #define MAX3100_PM_OPS NULL 886 #endif 887 888 static struct spi_driver max3100_driver = { 889 .driver = { 890 .name = "max3100", 891 .pm = MAX3100_PM_OPS, 892 }, 893 .probe = max3100_probe, 894 .remove = max3100_remove, 895 }; 896 897 module_spi_driver(max3100_driver); 898 899 MODULE_DESCRIPTION("MAX3100 driver"); 900 MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>"); 901 MODULE_LICENSE("GPL"); 902 MODULE_ALIAS("spi:max3100"); 903