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 92struct 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 136static struct max3100_port *max3100s[MAX_MAX3100]; /* the chips */ 137static DEFINE_MUTEX(max3100s_lock); /* race on probe */ 138 139static 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 157static int max3100_check_parity(struct max3100_port *s, u16 c) 158{ 159 return max3100_do_parity(s, c) == ((c >> 8) & 1); 160} 161 162static 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 173static void max3100_work(struct work_struct *w); 174 175static 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 181static 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 191static 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 216static int max3100_handlerx(struct max3100_port *s, u16 rx) 217{ 218 unsigned int status = 0; 219 int ret = 0, cts; 220 u8 ch, flg; 221 222 if (rx & MAX3100_R && s->rx_enabled) { 223 dev_dbg(&s->spi->dev, "%s\n", __func__); 224 ch = rx & (s->parity & MAX3100_7BIT ? 0x7f : 0xff); 225 if (rx & MAX3100_RAFE) { 226 s->port.icount.frame++; 227 flg = TTY_FRAME; 228 status |= MAX3100_STATUS_FE; 229 } else { 230 if (s->parity & MAX3100_PARITY_ON) { 231 if (max3100_check_parity(s, rx)) { 232 s->port.icount.rx++; 233 flg = TTY_NORMAL; 234 } else { 235 s->port.icount.parity++; 236 flg = TTY_PARITY; 237 status |= MAX3100_STATUS_PE; 238 } 239 } else { 240 s->port.icount.rx++; 241 flg = TTY_NORMAL; 242 } 243 } 244 uart_insert_char(&s->port, status, MAX3100_STATUS_OE, ch, flg); 245 ret = 1; 246 } 247 248 cts = (rx & MAX3100_CTS) > 0; 249 if (s->cts != cts) { 250 s->cts = cts; 251 uart_handle_cts_change(&s->port, cts); 252 } 253 254 return ret; 255} 256 257static void max3100_work(struct work_struct *w) 258{ 259 struct max3100_port *s = container_of(w, struct max3100_port, work); 260 int rxchars; 261 u16 tx, rx; 262 int conf, cconf, crts; 263 struct circ_buf *xmit = &s->port.state->xmit; 264 265 dev_dbg(&s->spi->dev, "%s\n", __func__); 266 267 rxchars = 0; 268 do { 269 spin_lock(&s->conf_lock); 270 conf = s->conf; 271 cconf = s->conf_commit; 272 s->conf_commit = 0; 273 crts = s->rts_commit; 274 s->rts_commit = 0; 275 spin_unlock(&s->conf_lock); 276 if (cconf) 277 max3100_sr(s, MAX3100_WC | conf, &rx); 278 if (crts) { 279 max3100_sr(s, MAX3100_WD | MAX3100_TE | 280 (s->rts ? MAX3100_RTS : 0), &rx); 281 rxchars += max3100_handlerx(s, rx); 282 } 283 284 max3100_sr(s, MAX3100_RD, &rx); 285 rxchars += max3100_handlerx(s, rx); 286 287 if (rx & MAX3100_T) { 288 tx = 0xffff; 289 if (s->port.x_char) { 290 tx = s->port.x_char; 291 s->port.icount.tx++; 292 s->port.x_char = 0; 293 } else if (!uart_circ_empty(xmit) && 294 !uart_tx_stopped(&s->port)) { 295 tx = xmit->buf[xmit->tail]; 296 uart_xmit_advance(&s->port, 1); 297 } 298 if (tx != 0xffff) { 299 max3100_calc_parity(s, &tx); 300 tx |= MAX3100_WD | (s->rts ? MAX3100_RTS : 0); 301 max3100_sr(s, tx, &rx); 302 rxchars += max3100_handlerx(s, rx); 303 } 304 } 305 306 if (rxchars > 16) { 307 tty_flip_buffer_push(&s->port.state->port); 308 rxchars = 0; 309 } 310 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 311 uart_write_wakeup(&s->port); 312 313 } while (!s->force_end_work && 314 !freezing(current) && 315 ((rx & MAX3100_R) || 316 (!uart_circ_empty(xmit) && 317 !uart_tx_stopped(&s->port)))); 318 319 if (rxchars > 0) 320 tty_flip_buffer_push(&s->port.state->port); 321} 322 323static irqreturn_t max3100_irq(int irqno, void *dev_id) 324{ 325 struct max3100_port *s = dev_id; 326 327 dev_dbg(&s->spi->dev, "%s\n", __func__); 328 329 max3100_dowork(s); 330 return IRQ_HANDLED; 331} 332 333static void max3100_enable_ms(struct uart_port *port) 334{ 335 struct max3100_port *s = container_of(port, 336 struct max3100_port, 337 port); 338 339 if (s->poll_time > 0) 340 mod_timer(&s->timer, jiffies); 341 dev_dbg(&s->spi->dev, "%s\n", __func__); 342} 343 344static void max3100_start_tx(struct uart_port *port) 345{ 346 struct max3100_port *s = container_of(port, 347 struct max3100_port, 348 port); 349 350 dev_dbg(&s->spi->dev, "%s\n", __func__); 351 352 max3100_dowork(s); 353} 354 355static void max3100_stop_rx(struct uart_port *port) 356{ 357 struct max3100_port *s = container_of(port, 358 struct max3100_port, 359 port); 360 361 dev_dbg(&s->spi->dev, "%s\n", __func__); 362 363 s->rx_enabled = 0; 364 spin_lock(&s->conf_lock); 365 s->conf &= ~MAX3100_RM; 366 s->conf_commit = 1; 367 spin_unlock(&s->conf_lock); 368 max3100_dowork(s); 369} 370 371static unsigned int max3100_tx_empty(struct uart_port *port) 372{ 373 struct max3100_port *s = container_of(port, 374 struct max3100_port, 375 port); 376 377 dev_dbg(&s->spi->dev, "%s\n", __func__); 378 379 /* may not be truly up-to-date */ 380 max3100_dowork(s); 381 return s->tx_empty; 382} 383 384static unsigned int max3100_get_mctrl(struct uart_port *port) 385{ 386 struct max3100_port *s = container_of(port, 387 struct max3100_port, 388 port); 389 390 dev_dbg(&s->spi->dev, "%s\n", __func__); 391 392 /* may not be truly up-to-date */ 393 max3100_dowork(s); 394 /* always assert DCD and DSR since these lines are not wired */ 395 return (s->cts ? TIOCM_CTS : 0) | TIOCM_DSR | TIOCM_CAR; 396} 397 398static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl) 399{ 400 struct max3100_port *s = container_of(port, 401 struct max3100_port, 402 port); 403 int rts; 404 405 dev_dbg(&s->spi->dev, "%s\n", __func__); 406 407 rts = (mctrl & TIOCM_RTS) > 0; 408 409 spin_lock(&s->conf_lock); 410 if (s->rts != rts) { 411 s->rts = rts; 412 s->rts_commit = 1; 413 max3100_dowork(s); 414 } 415 spin_unlock(&s->conf_lock); 416} 417 418static void 419max3100_set_termios(struct uart_port *port, struct ktermios *termios, 420 const struct ktermios *old) 421{ 422 struct max3100_port *s = container_of(port, 423 struct max3100_port, 424 port); 425 int baud = 0; 426 unsigned cflag; 427 u32 param_new, param_mask, parity = 0; 428 429 dev_dbg(&s->spi->dev, "%s\n", __func__); 430 431 cflag = termios->c_cflag; 432 param_mask = 0; 433 434 baud = tty_termios_baud_rate(termios); 435 param_new = s->conf & MAX3100_BAUD; 436 switch (baud) { 437 case 300: 438 if (s->crystal) 439 baud = s->baud; 440 else 441 param_new = 15; 442 break; 443 case 600: 444 param_new = 14 + s->crystal; 445 break; 446 case 1200: 447 param_new = 13 + s->crystal; 448 break; 449 case 2400: 450 param_new = 12 + s->crystal; 451 break; 452 case 4800: 453 param_new = 11 + s->crystal; 454 break; 455 case 9600: 456 param_new = 10 + s->crystal; 457 break; 458 case 19200: 459 param_new = 9 + s->crystal; 460 break; 461 case 38400: 462 param_new = 8 + s->crystal; 463 break; 464 case 57600: 465 param_new = 1 + s->crystal; 466 break; 467 case 115200: 468 param_new = 0 + s->crystal; 469 break; 470 case 230400: 471 if (s->crystal) 472 param_new = 0; 473 else 474 baud = s->baud; 475 break; 476 default: 477 baud = s->baud; 478 } 479 tty_termios_encode_baud_rate(termios, baud, baud); 480 s->baud = baud; 481 param_mask |= MAX3100_BAUD; 482 483 if ((cflag & CSIZE) == CS8) { 484 param_new &= ~MAX3100_L; 485 parity &= ~MAX3100_7BIT; 486 } else { 487 param_new |= MAX3100_L; 488 parity |= MAX3100_7BIT; 489 cflag = (cflag & ~CSIZE) | CS7; 490 } 491 param_mask |= MAX3100_L; 492 493 if (cflag & CSTOPB) 494 param_new |= MAX3100_ST; 495 else 496 param_new &= ~MAX3100_ST; 497 param_mask |= MAX3100_ST; 498 499 if (cflag & PARENB) { 500 param_new |= MAX3100_PE; 501 parity |= MAX3100_PARITY_ON; 502 } else { 503 param_new &= ~MAX3100_PE; 504 parity &= ~MAX3100_PARITY_ON; 505 } 506 param_mask |= MAX3100_PE; 507 508 if (cflag & PARODD) 509 parity |= MAX3100_PARITY_ODD; 510 else 511 parity &= ~MAX3100_PARITY_ODD; 512 513 /* mask termios capabilities we don't support */ 514 cflag &= ~CMSPAR; 515 termios->c_cflag = cflag; 516 517 s->port.ignore_status_mask = 0; 518 if (termios->c_iflag & IGNPAR) 519 s->port.ignore_status_mask |= 520 MAX3100_STATUS_PE | MAX3100_STATUS_FE | 521 MAX3100_STATUS_OE; 522 523 if (s->poll_time > 0) 524 del_timer_sync(&s->timer); 525 526 uart_update_timeout(port, termios->c_cflag, baud); 527 528 spin_lock(&s->conf_lock); 529 s->conf = (s->conf & ~param_mask) | (param_new & param_mask); 530 s->conf_commit = 1; 531 s->parity = parity; 532 spin_unlock(&s->conf_lock); 533 max3100_dowork(s); 534 535 if (UART_ENABLE_MS(&s->port, termios->c_cflag)) 536 max3100_enable_ms(&s->port); 537} 538 539static void max3100_shutdown(struct uart_port *port) 540{ 541 struct max3100_port *s = container_of(port, 542 struct max3100_port, 543 port); 544 545 dev_dbg(&s->spi->dev, "%s\n", __func__); 546 547 if (s->suspending) 548 return; 549 550 s->force_end_work = 1; 551 552 if (s->poll_time > 0) 553 del_timer_sync(&s->timer); 554 555 if (s->workqueue) { 556 destroy_workqueue(s->workqueue); 557 s->workqueue = NULL; 558 } 559 if (s->irq) 560 free_irq(s->irq, s); 561 562 /* set shutdown mode to save power */ 563 if (s->max3100_hw_suspend) 564 s->max3100_hw_suspend(1); 565 else { 566 u16 tx, rx; 567 568 tx = MAX3100_WC | MAX3100_SHDN; 569 max3100_sr(s, tx, &rx); 570 } 571} 572 573static int max3100_startup(struct uart_port *port) 574{ 575 struct max3100_port *s = container_of(port, 576 struct max3100_port, 577 port); 578 char b[12]; 579 580 dev_dbg(&s->spi->dev, "%s\n", __func__); 581 582 s->conf = MAX3100_RM; 583 s->baud = s->crystal ? 230400 : 115200; 584 s->rx_enabled = 1; 585 586 if (s->suspending) 587 return 0; 588 589 s->force_end_work = 0; 590 s->parity = 0; 591 s->rts = 0; 592 593 sprintf(b, "max3100-%d", s->minor); 594 s->workqueue = create_freezable_workqueue(b); 595 if (!s->workqueue) { 596 dev_warn(&s->spi->dev, "cannot create workqueue\n"); 597 return -EBUSY; 598 } 599 INIT_WORK(&s->work, max3100_work); 600 601 if (request_irq(s->irq, max3100_irq, 602 IRQF_TRIGGER_FALLING, "max3100", s) < 0) { 603 dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq); 604 s->irq = 0; 605 destroy_workqueue(s->workqueue); 606 s->workqueue = NULL; 607 return -EBUSY; 608 } 609 610 if (s->loopback) { 611 u16 tx, rx; 612 tx = 0x4001; 613 max3100_sr(s, tx, &rx); 614 } 615 616 if (s->max3100_hw_suspend) 617 s->max3100_hw_suspend(0); 618 s->conf_commit = 1; 619 max3100_dowork(s); 620 /* wait for clock to settle */ 621 msleep(50); 622 623 max3100_enable_ms(&s->port); 624 625 return 0; 626} 627 628static const char *max3100_type(struct uart_port *port) 629{ 630 struct max3100_port *s = container_of(port, 631 struct max3100_port, 632 port); 633 634 dev_dbg(&s->spi->dev, "%s\n", __func__); 635 636 return s->port.type == PORT_MAX3100 ? "MAX3100" : NULL; 637} 638 639static void max3100_release_port(struct uart_port *port) 640{ 641 struct max3100_port *s = container_of(port, 642 struct max3100_port, 643 port); 644 645 dev_dbg(&s->spi->dev, "%s\n", __func__); 646} 647 648static void max3100_config_port(struct uart_port *port, int flags) 649{ 650 struct max3100_port *s = container_of(port, 651 struct max3100_port, 652 port); 653 654 dev_dbg(&s->spi->dev, "%s\n", __func__); 655 656 if (flags & UART_CONFIG_TYPE) 657 s->port.type = PORT_MAX3100; 658} 659 660static int max3100_verify_port(struct uart_port *port, 661 struct serial_struct *ser) 662{ 663 struct max3100_port *s = container_of(port, 664 struct max3100_port, 665 port); 666 int ret = -EINVAL; 667 668 dev_dbg(&s->spi->dev, "%s\n", __func__); 669 670 if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3100) 671 ret = 0; 672 return ret; 673} 674 675static void max3100_stop_tx(struct uart_port *port) 676{ 677 struct max3100_port *s = container_of(port, 678 struct max3100_port, 679 port); 680 681 dev_dbg(&s->spi->dev, "%s\n", __func__); 682} 683 684static int max3100_request_port(struct uart_port *port) 685{ 686 struct max3100_port *s = container_of(port, 687 struct max3100_port, 688 port); 689 690 dev_dbg(&s->spi->dev, "%s\n", __func__); 691 return 0; 692} 693 694static void max3100_break_ctl(struct uart_port *port, int break_state) 695{ 696 struct max3100_port *s = container_of(port, 697 struct max3100_port, 698 port); 699 700 dev_dbg(&s->spi->dev, "%s\n", __func__); 701} 702 703static const struct uart_ops max3100_ops = { 704 .tx_empty = max3100_tx_empty, 705 .set_mctrl = max3100_set_mctrl, 706 .get_mctrl = max3100_get_mctrl, 707 .stop_tx = max3100_stop_tx, 708 .start_tx = max3100_start_tx, 709 .stop_rx = max3100_stop_rx, 710 .enable_ms = max3100_enable_ms, 711 .break_ctl = max3100_break_ctl, 712 .startup = max3100_startup, 713 .shutdown = max3100_shutdown, 714 .set_termios = max3100_set_termios, 715 .type = max3100_type, 716 .release_port = max3100_release_port, 717 .request_port = max3100_request_port, 718 .config_port = max3100_config_port, 719 .verify_port = max3100_verify_port, 720}; 721 722static struct uart_driver max3100_uart_driver = { 723 .owner = THIS_MODULE, 724 .driver_name = "ttyMAX", 725 .dev_name = "ttyMAX", 726 .major = MAX3100_MAJOR, 727 .minor = MAX3100_MINOR, 728 .nr = MAX_MAX3100, 729}; 730static int uart_driver_registered; 731 732static int max3100_probe(struct spi_device *spi) 733{ 734 int i, retval; 735 struct plat_max3100 *pdata; 736 u16 tx, rx; 737 738 mutex_lock(&max3100s_lock); 739 740 if (!uart_driver_registered) { 741 uart_driver_registered = 1; 742 retval = uart_register_driver(&max3100_uart_driver); 743 if (retval) { 744 printk(KERN_ERR "Couldn't register max3100 uart driver\n"); 745 mutex_unlock(&max3100s_lock); 746 return retval; 747 } 748 } 749 750 for (i = 0; i < MAX_MAX3100; i++) 751 if (!max3100s[i]) 752 break; 753 if (i == MAX_MAX3100) { 754 dev_warn(&spi->dev, "too many MAX3100 chips\n"); 755 mutex_unlock(&max3100s_lock); 756 return -ENOMEM; 757 } 758 759 max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL); 760 if (!max3100s[i]) { 761 dev_warn(&spi->dev, 762 "kmalloc for max3100 structure %d failed!\n", i); 763 mutex_unlock(&max3100s_lock); 764 return -ENOMEM; 765 } 766 max3100s[i]->spi = spi; 767 max3100s[i]->irq = spi->irq; 768 spin_lock_init(&max3100s[i]->conf_lock); 769 spi_set_drvdata(spi, max3100s[i]); 770 pdata = dev_get_platdata(&spi->dev); 771 max3100s[i]->crystal = pdata->crystal; 772 max3100s[i]->loopback = pdata->loopback; 773 max3100s[i]->poll_time = msecs_to_jiffies(pdata->poll_time); 774 if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0) 775 max3100s[i]->poll_time = 1; 776 max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend; 777 max3100s[i]->minor = i; 778 timer_setup(&max3100s[i]->timer, max3100_timeout, 0); 779 780 dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i); 781 max3100s[i]->port.irq = max3100s[i]->irq; 782 max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200; 783 max3100s[i]->port.fifosize = 16; 784 max3100s[i]->port.ops = &max3100_ops; 785 max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; 786 max3100s[i]->port.line = i; 787 max3100s[i]->port.type = PORT_MAX3100; 788 max3100s[i]->port.dev = &spi->dev; 789 retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port); 790 if (retval < 0) 791 dev_warn(&spi->dev, 792 "uart_add_one_port failed for line %d with error %d\n", 793 i, retval); 794 795 /* set shutdown mode to save power. Will be woken-up on open */ 796 if (max3100s[i]->max3100_hw_suspend) 797 max3100s[i]->max3100_hw_suspend(1); 798 else { 799 tx = MAX3100_WC | MAX3100_SHDN; 800 max3100_sr(max3100s[i], tx, &rx); 801 } 802 mutex_unlock(&max3100s_lock); 803 return 0; 804} 805 806static void max3100_remove(struct spi_device *spi) 807{ 808 struct max3100_port *s = spi_get_drvdata(spi); 809 int i; 810 811 mutex_lock(&max3100s_lock); 812 813 /* find out the index for the chip we are removing */ 814 for (i = 0; i < MAX_MAX3100; i++) 815 if (max3100s[i] == s) { 816 dev_dbg(&spi->dev, "%s: removing port %d\n", __func__, i); 817 uart_remove_one_port(&max3100_uart_driver, &max3100s[i]->port); 818 kfree(max3100s[i]); 819 max3100s[i] = NULL; 820 break; 821 } 822 823 WARN_ON(i == MAX_MAX3100); 824 825 /* check if this is the last chip we have */ 826 for (i = 0; i < MAX_MAX3100; i++) 827 if (max3100s[i]) { 828 mutex_unlock(&max3100s_lock); 829 return; 830 } 831 pr_debug("removing max3100 driver\n"); 832 uart_unregister_driver(&max3100_uart_driver); 833 834 mutex_unlock(&max3100s_lock); 835} 836 837#ifdef CONFIG_PM_SLEEP 838 839static int max3100_suspend(struct device *dev) 840{ 841 struct max3100_port *s = dev_get_drvdata(dev); 842 843 dev_dbg(&s->spi->dev, "%s\n", __func__); 844 845 disable_irq(s->irq); 846 847 s->suspending = 1; 848 uart_suspend_port(&max3100_uart_driver, &s->port); 849 850 if (s->max3100_hw_suspend) 851 s->max3100_hw_suspend(1); 852 else { 853 /* no HW suspend, so do SW one */ 854 u16 tx, rx; 855 856 tx = MAX3100_WC | MAX3100_SHDN; 857 max3100_sr(s, tx, &rx); 858 } 859 return 0; 860} 861 862static int max3100_resume(struct device *dev) 863{ 864 struct max3100_port *s = dev_get_drvdata(dev); 865 866 dev_dbg(&s->spi->dev, "%s\n", __func__); 867 868 if (s->max3100_hw_suspend) 869 s->max3100_hw_suspend(0); 870 uart_resume_port(&max3100_uart_driver, &s->port); 871 s->suspending = 0; 872 873 enable_irq(s->irq); 874 875 s->conf_commit = 1; 876 if (s->workqueue) 877 max3100_dowork(s); 878 879 return 0; 880} 881 882static SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume); 883#define MAX3100_PM_OPS (&max3100_pm_ops) 884 885#else 886#define MAX3100_PM_OPS NULL 887#endif 888 889static struct spi_driver max3100_driver = { 890 .driver = { 891 .name = "max3100", 892 .pm = MAX3100_PM_OPS, 893 }, 894 .probe = max3100_probe, 895 .remove = max3100_remove, 896}; 897 898module_spi_driver(max3100_driver); 899 900MODULE_DESCRIPTION("MAX3100 driver"); 901MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>"); 902MODULE_LICENSE("GPL"); 903MODULE_ALIAS("spi:max3100"); 904