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 xmit->tail = (xmit->tail + 1) & 296 (UART_XMIT_SIZE - 1); 297 s->port.icount.tx++; 298 } 299 if (tx != 0xffff) { 300 max3100_calc_parity(s, &tx); 301 tx |= MAX3100_WD | (s->rts ? MAX3100_RTS : 0); 302 max3100_sr(s, tx, &rx); 303 rxchars += max3100_handlerx(s, rx); 304 } 305 } 306 307 if (rxchars > 16) { 308 tty_flip_buffer_push(&s->port.state->port); 309 rxchars = 0; 310 } 311 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) 312 uart_write_wakeup(&s->port); 313 314 } while (!s->force_end_work && 315 !freezing(current) && 316 ((rx & MAX3100_R) || 317 (!uart_circ_empty(xmit) && 318 !uart_tx_stopped(&s->port)))); 319 320 if (rxchars > 0) 321 tty_flip_buffer_push(&s->port.state->port); 322 } 323 324 static irqreturn_t max3100_irq(int irqno, void *dev_id) 325 { 326 struct max3100_port *s = dev_id; 327 328 dev_dbg(&s->spi->dev, "%s\n", __func__); 329 330 max3100_dowork(s); 331 return IRQ_HANDLED; 332 } 333 334 static void max3100_enable_ms(struct uart_port *port) 335 { 336 struct max3100_port *s = container_of(port, 337 struct max3100_port, 338 port); 339 340 if (s->poll_time > 0) 341 mod_timer(&s->timer, jiffies); 342 dev_dbg(&s->spi->dev, "%s\n", __func__); 343 } 344 345 static void max3100_start_tx(struct uart_port *port) 346 { 347 struct max3100_port *s = container_of(port, 348 struct max3100_port, 349 port); 350 351 dev_dbg(&s->spi->dev, "%s\n", __func__); 352 353 max3100_dowork(s); 354 } 355 356 static void max3100_stop_rx(struct uart_port *port) 357 { 358 struct max3100_port *s = container_of(port, 359 struct max3100_port, 360 port); 361 362 dev_dbg(&s->spi->dev, "%s\n", __func__); 363 364 s->rx_enabled = 0; 365 spin_lock(&s->conf_lock); 366 s->conf &= ~MAX3100_RM; 367 s->conf_commit = 1; 368 spin_unlock(&s->conf_lock); 369 max3100_dowork(s); 370 } 371 372 static unsigned int max3100_tx_empty(struct uart_port *port) 373 { 374 struct max3100_port *s = container_of(port, 375 struct max3100_port, 376 port); 377 378 dev_dbg(&s->spi->dev, "%s\n", __func__); 379 380 /* may not be truly up-to-date */ 381 max3100_dowork(s); 382 return s->tx_empty; 383 } 384 385 static unsigned int max3100_get_mctrl(struct uart_port *port) 386 { 387 struct max3100_port *s = container_of(port, 388 struct max3100_port, 389 port); 390 391 dev_dbg(&s->spi->dev, "%s\n", __func__); 392 393 /* may not be truly up-to-date */ 394 max3100_dowork(s); 395 /* always assert DCD and DSR since these lines are not wired */ 396 return (s->cts ? TIOCM_CTS : 0) | TIOCM_DSR | TIOCM_CAR; 397 } 398 399 static void max3100_set_mctrl(struct uart_port *port, unsigned int mctrl) 400 { 401 struct max3100_port *s = container_of(port, 402 struct max3100_port, 403 port); 404 int rts; 405 406 dev_dbg(&s->spi->dev, "%s\n", __func__); 407 408 rts = (mctrl & TIOCM_RTS) > 0; 409 410 spin_lock(&s->conf_lock); 411 if (s->rts != rts) { 412 s->rts = rts; 413 s->rts_commit = 1; 414 max3100_dowork(s); 415 } 416 spin_unlock(&s->conf_lock); 417 } 418 419 static void 420 max3100_set_termios(struct uart_port *port, struct ktermios *termios, 421 const struct ktermios *old) 422 { 423 struct max3100_port *s = container_of(port, 424 struct max3100_port, 425 port); 426 int baud = 0; 427 unsigned cflag; 428 u32 param_new, param_mask, parity = 0; 429 430 dev_dbg(&s->spi->dev, "%s\n", __func__); 431 432 cflag = termios->c_cflag; 433 param_mask = 0; 434 435 baud = tty_termios_baud_rate(termios); 436 param_new = s->conf & MAX3100_BAUD; 437 switch (baud) { 438 case 300: 439 if (s->crystal) 440 baud = s->baud; 441 else 442 param_new = 15; 443 break; 444 case 600: 445 param_new = 14 + s->crystal; 446 break; 447 case 1200: 448 param_new = 13 + s->crystal; 449 break; 450 case 2400: 451 param_new = 12 + s->crystal; 452 break; 453 case 4800: 454 param_new = 11 + s->crystal; 455 break; 456 case 9600: 457 param_new = 10 + s->crystal; 458 break; 459 case 19200: 460 param_new = 9 + s->crystal; 461 break; 462 case 38400: 463 param_new = 8 + s->crystal; 464 break; 465 case 57600: 466 param_new = 1 + s->crystal; 467 break; 468 case 115200: 469 param_new = 0 + s->crystal; 470 break; 471 case 230400: 472 if (s->crystal) 473 param_new = 0; 474 else 475 baud = s->baud; 476 break; 477 default: 478 baud = s->baud; 479 } 480 tty_termios_encode_baud_rate(termios, baud, baud); 481 s->baud = baud; 482 param_mask |= MAX3100_BAUD; 483 484 if ((cflag & CSIZE) == CS8) { 485 param_new &= ~MAX3100_L; 486 parity &= ~MAX3100_7BIT; 487 } else { 488 param_new |= MAX3100_L; 489 parity |= MAX3100_7BIT; 490 cflag = (cflag & ~CSIZE) | CS7; 491 } 492 param_mask |= MAX3100_L; 493 494 if (cflag & CSTOPB) 495 param_new |= MAX3100_ST; 496 else 497 param_new &= ~MAX3100_ST; 498 param_mask |= MAX3100_ST; 499 500 if (cflag & PARENB) { 501 param_new |= MAX3100_PE; 502 parity |= MAX3100_PARITY_ON; 503 } else { 504 param_new &= ~MAX3100_PE; 505 parity &= ~MAX3100_PARITY_ON; 506 } 507 param_mask |= MAX3100_PE; 508 509 if (cflag & PARODD) 510 parity |= MAX3100_PARITY_ODD; 511 else 512 parity &= ~MAX3100_PARITY_ODD; 513 514 /* mask termios capabilities we don't support */ 515 cflag &= ~CMSPAR; 516 termios->c_cflag = cflag; 517 518 s->port.ignore_status_mask = 0; 519 if (termios->c_iflag & IGNPAR) 520 s->port.ignore_status_mask |= 521 MAX3100_STATUS_PE | MAX3100_STATUS_FE | 522 MAX3100_STATUS_OE; 523 524 if (s->poll_time > 0) 525 del_timer_sync(&s->timer); 526 527 uart_update_timeout(port, termios->c_cflag, baud); 528 529 spin_lock(&s->conf_lock); 530 s->conf = (s->conf & ~param_mask) | (param_new & param_mask); 531 s->conf_commit = 1; 532 s->parity = parity; 533 spin_unlock(&s->conf_lock); 534 max3100_dowork(s); 535 536 if (UART_ENABLE_MS(&s->port, termios->c_cflag)) 537 max3100_enable_ms(&s->port); 538 } 539 540 static void max3100_shutdown(struct uart_port *port) 541 { 542 struct max3100_port *s = container_of(port, 543 struct max3100_port, 544 port); 545 546 dev_dbg(&s->spi->dev, "%s\n", __func__); 547 548 if (s->suspending) 549 return; 550 551 s->force_end_work = 1; 552 553 if (s->poll_time > 0) 554 del_timer_sync(&s->timer); 555 556 if (s->workqueue) { 557 destroy_workqueue(s->workqueue); 558 s->workqueue = NULL; 559 } 560 if (s->irq) 561 free_irq(s->irq, s); 562 563 /* set shutdown mode to save power */ 564 if (s->max3100_hw_suspend) 565 s->max3100_hw_suspend(1); 566 else { 567 u16 tx, rx; 568 569 tx = MAX3100_WC | MAX3100_SHDN; 570 max3100_sr(s, tx, &rx); 571 } 572 } 573 574 static int max3100_startup(struct uart_port *port) 575 { 576 struct max3100_port *s = container_of(port, 577 struct max3100_port, 578 port); 579 char b[12]; 580 581 dev_dbg(&s->spi->dev, "%s\n", __func__); 582 583 s->conf = MAX3100_RM; 584 s->baud = s->crystal ? 230400 : 115200; 585 s->rx_enabled = 1; 586 587 if (s->suspending) 588 return 0; 589 590 s->force_end_work = 0; 591 s->parity = 0; 592 s->rts = 0; 593 594 sprintf(b, "max3100-%d", s->minor); 595 s->workqueue = create_freezable_workqueue(b); 596 if (!s->workqueue) { 597 dev_warn(&s->spi->dev, "cannot create workqueue\n"); 598 return -EBUSY; 599 } 600 INIT_WORK(&s->work, max3100_work); 601 602 if (request_irq(s->irq, max3100_irq, 603 IRQF_TRIGGER_FALLING, "max3100", s) < 0) { 604 dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq); 605 s->irq = 0; 606 destroy_workqueue(s->workqueue); 607 s->workqueue = NULL; 608 return -EBUSY; 609 } 610 611 if (s->loopback) { 612 u16 tx, rx; 613 tx = 0x4001; 614 max3100_sr(s, tx, &rx); 615 } 616 617 if (s->max3100_hw_suspend) 618 s->max3100_hw_suspend(0); 619 s->conf_commit = 1; 620 max3100_dowork(s); 621 /* wait for clock to settle */ 622 msleep(50); 623 624 max3100_enable_ms(&s->port); 625 626 return 0; 627 } 628 629 static const char *max3100_type(struct uart_port *port) 630 { 631 struct max3100_port *s = container_of(port, 632 struct max3100_port, 633 port); 634 635 dev_dbg(&s->spi->dev, "%s\n", __func__); 636 637 return s->port.type == PORT_MAX3100 ? "MAX3100" : NULL; 638 } 639 640 static void max3100_release_port(struct uart_port *port) 641 { 642 struct max3100_port *s = container_of(port, 643 struct max3100_port, 644 port); 645 646 dev_dbg(&s->spi->dev, "%s\n", __func__); 647 } 648 649 static void max3100_config_port(struct uart_port *port, int flags) 650 { 651 struct max3100_port *s = container_of(port, 652 struct max3100_port, 653 port); 654 655 dev_dbg(&s->spi->dev, "%s\n", __func__); 656 657 if (flags & UART_CONFIG_TYPE) 658 s->port.type = PORT_MAX3100; 659 } 660 661 static int max3100_verify_port(struct uart_port *port, 662 struct serial_struct *ser) 663 { 664 struct max3100_port *s = container_of(port, 665 struct max3100_port, 666 port); 667 int ret = -EINVAL; 668 669 dev_dbg(&s->spi->dev, "%s\n", __func__); 670 671 if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3100) 672 ret = 0; 673 return ret; 674 } 675 676 static void max3100_stop_tx(struct uart_port *port) 677 { 678 struct max3100_port *s = container_of(port, 679 struct max3100_port, 680 port); 681 682 dev_dbg(&s->spi->dev, "%s\n", __func__); 683 } 684 685 static int max3100_request_port(struct uart_port *port) 686 { 687 struct max3100_port *s = container_of(port, 688 struct max3100_port, 689 port); 690 691 dev_dbg(&s->spi->dev, "%s\n", __func__); 692 return 0; 693 } 694 695 static void max3100_break_ctl(struct uart_port *port, int break_state) 696 { 697 struct max3100_port *s = container_of(port, 698 struct max3100_port, 699 port); 700 701 dev_dbg(&s->spi->dev, "%s\n", __func__); 702 } 703 704 static const struct uart_ops max3100_ops = { 705 .tx_empty = max3100_tx_empty, 706 .set_mctrl = max3100_set_mctrl, 707 .get_mctrl = max3100_get_mctrl, 708 .stop_tx = max3100_stop_tx, 709 .start_tx = max3100_start_tx, 710 .stop_rx = max3100_stop_rx, 711 .enable_ms = max3100_enable_ms, 712 .break_ctl = max3100_break_ctl, 713 .startup = max3100_startup, 714 .shutdown = max3100_shutdown, 715 .set_termios = max3100_set_termios, 716 .type = max3100_type, 717 .release_port = max3100_release_port, 718 .request_port = max3100_request_port, 719 .config_port = max3100_config_port, 720 .verify_port = max3100_verify_port, 721 }; 722 723 static struct uart_driver max3100_uart_driver = { 724 .owner = THIS_MODULE, 725 .driver_name = "ttyMAX", 726 .dev_name = "ttyMAX", 727 .major = MAX3100_MAJOR, 728 .minor = MAX3100_MINOR, 729 .nr = MAX_MAX3100, 730 }; 731 static int uart_driver_registered; 732 733 static int max3100_probe(struct spi_device *spi) 734 { 735 int i, retval; 736 struct plat_max3100 *pdata; 737 u16 tx, rx; 738 739 mutex_lock(&max3100s_lock); 740 741 if (!uart_driver_registered) { 742 uart_driver_registered = 1; 743 retval = uart_register_driver(&max3100_uart_driver); 744 if (retval) { 745 printk(KERN_ERR "Couldn't register max3100 uart driver\n"); 746 mutex_unlock(&max3100s_lock); 747 return retval; 748 } 749 } 750 751 for (i = 0; i < MAX_MAX3100; i++) 752 if (!max3100s[i]) 753 break; 754 if (i == MAX_MAX3100) { 755 dev_warn(&spi->dev, "too many MAX3100 chips\n"); 756 mutex_unlock(&max3100s_lock); 757 return -ENOMEM; 758 } 759 760 max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL); 761 if (!max3100s[i]) { 762 dev_warn(&spi->dev, 763 "kmalloc for max3100 structure %d failed!\n", i); 764 mutex_unlock(&max3100s_lock); 765 return -ENOMEM; 766 } 767 max3100s[i]->spi = spi; 768 max3100s[i]->irq = spi->irq; 769 spin_lock_init(&max3100s[i]->conf_lock); 770 spi_set_drvdata(spi, max3100s[i]); 771 pdata = dev_get_platdata(&spi->dev); 772 max3100s[i]->crystal = pdata->crystal; 773 max3100s[i]->loopback = pdata->loopback; 774 max3100s[i]->poll_time = msecs_to_jiffies(pdata->poll_time); 775 if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0) 776 max3100s[i]->poll_time = 1; 777 max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend; 778 max3100s[i]->minor = i; 779 timer_setup(&max3100s[i]->timer, max3100_timeout, 0); 780 781 dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i); 782 max3100s[i]->port.irq = max3100s[i]->irq; 783 max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200; 784 max3100s[i]->port.fifosize = 16; 785 max3100s[i]->port.ops = &max3100_ops; 786 max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; 787 max3100s[i]->port.line = i; 788 max3100s[i]->port.type = PORT_MAX3100; 789 max3100s[i]->port.dev = &spi->dev; 790 retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port); 791 if (retval < 0) 792 dev_warn(&spi->dev, 793 "uart_add_one_port failed for line %d with error %d\n", 794 i, retval); 795 796 /* set shutdown mode to save power. Will be woken-up on open */ 797 if (max3100s[i]->max3100_hw_suspend) 798 max3100s[i]->max3100_hw_suspend(1); 799 else { 800 tx = MAX3100_WC | MAX3100_SHDN; 801 max3100_sr(max3100s[i], tx, &rx); 802 } 803 mutex_unlock(&max3100s_lock); 804 return 0; 805 } 806 807 static void max3100_remove(struct spi_device *spi) 808 { 809 struct max3100_port *s = spi_get_drvdata(spi); 810 int i; 811 812 mutex_lock(&max3100s_lock); 813 814 /* find out the index for the chip we are removing */ 815 for (i = 0; i < MAX_MAX3100; i++) 816 if (max3100s[i] == s) { 817 dev_dbg(&spi->dev, "%s: removing port %d\n", __func__, i); 818 uart_remove_one_port(&max3100_uart_driver, &max3100s[i]->port); 819 kfree(max3100s[i]); 820 max3100s[i] = NULL; 821 break; 822 } 823 824 WARN_ON(i == MAX_MAX3100); 825 826 /* check if this is the last chip we have */ 827 for (i = 0; i < MAX_MAX3100; i++) 828 if (max3100s[i]) { 829 mutex_unlock(&max3100s_lock); 830 return; 831 } 832 pr_debug("removing max3100 driver\n"); 833 uart_unregister_driver(&max3100_uart_driver); 834 835 mutex_unlock(&max3100s_lock); 836 } 837 838 #ifdef CONFIG_PM_SLEEP 839 840 static int max3100_suspend(struct device *dev) 841 { 842 struct max3100_port *s = dev_get_drvdata(dev); 843 844 dev_dbg(&s->spi->dev, "%s\n", __func__); 845 846 disable_irq(s->irq); 847 848 s->suspending = 1; 849 uart_suspend_port(&max3100_uart_driver, &s->port); 850 851 if (s->max3100_hw_suspend) 852 s->max3100_hw_suspend(1); 853 else { 854 /* no HW suspend, so do SW one */ 855 u16 tx, rx; 856 857 tx = MAX3100_WC | MAX3100_SHDN; 858 max3100_sr(s, tx, &rx); 859 } 860 return 0; 861 } 862 863 static int max3100_resume(struct device *dev) 864 { 865 struct max3100_port *s = dev_get_drvdata(dev); 866 867 dev_dbg(&s->spi->dev, "%s\n", __func__); 868 869 if (s->max3100_hw_suspend) 870 s->max3100_hw_suspend(0); 871 uart_resume_port(&max3100_uart_driver, &s->port); 872 s->suspending = 0; 873 874 enable_irq(s->irq); 875 876 s->conf_commit = 1; 877 if (s->workqueue) 878 max3100_dowork(s); 879 880 return 0; 881 } 882 883 static SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume); 884 #define MAX3100_PM_OPS (&max3100_pm_ops) 885 886 #else 887 #define MAX3100_PM_OPS NULL 888 #endif 889 890 static struct spi_driver max3100_driver = { 891 .driver = { 892 .name = "max3100", 893 .pm = MAX3100_PM_OPS, 894 }, 895 .probe = max3100_probe, 896 .remove = max3100_remove, 897 }; 898 899 module_spi_driver(max3100_driver); 900 901 MODULE_DESCRIPTION("MAX3100 driver"); 902 MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>"); 903 MODULE_LICENSE("GPL"); 904 MODULE_ALIAS("spi:max3100"); 905