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 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 /* we are sending char from a workqueue so enable */ 525 s->port.state->port.low_latency = 1; 526 527 if (s->poll_time > 0) 528 del_timer_sync(&s->timer); 529 530 uart_update_timeout(port, termios->c_cflag, baud); 531 532 spin_lock(&s->conf_lock); 533 s->conf = (s->conf & ~param_mask) | (param_new & param_mask); 534 s->conf_commit = 1; 535 s->parity = parity; 536 spin_unlock(&s->conf_lock); 537 max3100_dowork(s); 538 539 if (UART_ENABLE_MS(&s->port, termios->c_cflag)) 540 max3100_enable_ms(&s->port); 541 } 542 543 static void max3100_shutdown(struct uart_port *port) 544 { 545 struct max3100_port *s = container_of(port, 546 struct max3100_port, 547 port); 548 549 dev_dbg(&s->spi->dev, "%s\n", __func__); 550 551 if (s->suspending) 552 return; 553 554 s->force_end_work = 1; 555 556 if (s->poll_time > 0) 557 del_timer_sync(&s->timer); 558 559 if (s->workqueue) { 560 flush_workqueue(s->workqueue); 561 destroy_workqueue(s->workqueue); 562 s->workqueue = NULL; 563 } 564 if (s->irq) 565 free_irq(s->irq, s); 566 567 /* set shutdown mode to save power */ 568 if (s->max3100_hw_suspend) 569 s->max3100_hw_suspend(1); 570 else { 571 u16 tx, rx; 572 573 tx = MAX3100_WC | MAX3100_SHDN; 574 max3100_sr(s, tx, &rx); 575 } 576 } 577 578 static int max3100_startup(struct uart_port *port) 579 { 580 struct max3100_port *s = container_of(port, 581 struct max3100_port, 582 port); 583 char b[12]; 584 585 dev_dbg(&s->spi->dev, "%s\n", __func__); 586 587 s->conf = MAX3100_RM; 588 s->baud = s->crystal ? 230400 : 115200; 589 s->rx_enabled = 1; 590 591 if (s->suspending) 592 return 0; 593 594 s->force_end_work = 0; 595 s->parity = 0; 596 s->rts = 0; 597 598 sprintf(b, "max3100-%d", s->minor); 599 s->workqueue = create_freezable_workqueue(b); 600 if (!s->workqueue) { 601 dev_warn(&s->spi->dev, "cannot create workqueue\n"); 602 return -EBUSY; 603 } 604 INIT_WORK(&s->work, max3100_work); 605 606 if (request_irq(s->irq, max3100_irq, 607 IRQF_TRIGGER_FALLING, "max3100", s) < 0) { 608 dev_warn(&s->spi->dev, "cannot allocate irq %d\n", s->irq); 609 s->irq = 0; 610 destroy_workqueue(s->workqueue); 611 s->workqueue = NULL; 612 return -EBUSY; 613 } 614 615 if (s->loopback) { 616 u16 tx, rx; 617 tx = 0x4001; 618 max3100_sr(s, tx, &rx); 619 } 620 621 if (s->max3100_hw_suspend) 622 s->max3100_hw_suspend(0); 623 s->conf_commit = 1; 624 max3100_dowork(s); 625 /* wait for clock to settle */ 626 msleep(50); 627 628 max3100_enable_ms(&s->port); 629 630 return 0; 631 } 632 633 static const char *max3100_type(struct uart_port *port) 634 { 635 struct max3100_port *s = container_of(port, 636 struct max3100_port, 637 port); 638 639 dev_dbg(&s->spi->dev, "%s\n", __func__); 640 641 return s->port.type == PORT_MAX3100 ? "MAX3100" : NULL; 642 } 643 644 static void max3100_release_port(struct uart_port *port) 645 { 646 struct max3100_port *s = container_of(port, 647 struct max3100_port, 648 port); 649 650 dev_dbg(&s->spi->dev, "%s\n", __func__); 651 } 652 653 static void max3100_config_port(struct uart_port *port, int flags) 654 { 655 struct max3100_port *s = container_of(port, 656 struct max3100_port, 657 port); 658 659 dev_dbg(&s->spi->dev, "%s\n", __func__); 660 661 if (flags & UART_CONFIG_TYPE) 662 s->port.type = PORT_MAX3100; 663 } 664 665 static int max3100_verify_port(struct uart_port *port, 666 struct serial_struct *ser) 667 { 668 struct max3100_port *s = container_of(port, 669 struct max3100_port, 670 port); 671 int ret = -EINVAL; 672 673 dev_dbg(&s->spi->dev, "%s\n", __func__); 674 675 if (ser->type == PORT_UNKNOWN || ser->type == PORT_MAX3100) 676 ret = 0; 677 return ret; 678 } 679 680 static void max3100_stop_tx(struct uart_port *port) 681 { 682 struct max3100_port *s = container_of(port, 683 struct max3100_port, 684 port); 685 686 dev_dbg(&s->spi->dev, "%s\n", __func__); 687 } 688 689 static int max3100_request_port(struct uart_port *port) 690 { 691 struct max3100_port *s = container_of(port, 692 struct max3100_port, 693 port); 694 695 dev_dbg(&s->spi->dev, "%s\n", __func__); 696 return 0; 697 } 698 699 static void max3100_break_ctl(struct uart_port *port, int break_state) 700 { 701 struct max3100_port *s = container_of(port, 702 struct max3100_port, 703 port); 704 705 dev_dbg(&s->spi->dev, "%s\n", __func__); 706 } 707 708 static const struct uart_ops max3100_ops = { 709 .tx_empty = max3100_tx_empty, 710 .set_mctrl = max3100_set_mctrl, 711 .get_mctrl = max3100_get_mctrl, 712 .stop_tx = max3100_stop_tx, 713 .start_tx = max3100_start_tx, 714 .stop_rx = max3100_stop_rx, 715 .enable_ms = max3100_enable_ms, 716 .break_ctl = max3100_break_ctl, 717 .startup = max3100_startup, 718 .shutdown = max3100_shutdown, 719 .set_termios = max3100_set_termios, 720 .type = max3100_type, 721 .release_port = max3100_release_port, 722 .request_port = max3100_request_port, 723 .config_port = max3100_config_port, 724 .verify_port = max3100_verify_port, 725 }; 726 727 static struct uart_driver max3100_uart_driver = { 728 .owner = THIS_MODULE, 729 .driver_name = "ttyMAX", 730 .dev_name = "ttyMAX", 731 .major = MAX3100_MAJOR, 732 .minor = MAX3100_MINOR, 733 .nr = MAX_MAX3100, 734 }; 735 static int uart_driver_registered; 736 737 static int max3100_probe(struct spi_device *spi) 738 { 739 int i, retval; 740 struct plat_max3100 *pdata; 741 u16 tx, rx; 742 743 mutex_lock(&max3100s_lock); 744 745 if (!uart_driver_registered) { 746 uart_driver_registered = 1; 747 retval = uart_register_driver(&max3100_uart_driver); 748 if (retval) { 749 printk(KERN_ERR "Couldn't register max3100 uart driver\n"); 750 mutex_unlock(&max3100s_lock); 751 return retval; 752 } 753 } 754 755 for (i = 0; i < MAX_MAX3100; i++) 756 if (!max3100s[i]) 757 break; 758 if (i == MAX_MAX3100) { 759 dev_warn(&spi->dev, "too many MAX3100 chips\n"); 760 mutex_unlock(&max3100s_lock); 761 return -ENOMEM; 762 } 763 764 max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL); 765 if (!max3100s[i]) { 766 dev_warn(&spi->dev, 767 "kmalloc for max3100 structure %d failed!\n", i); 768 mutex_unlock(&max3100s_lock); 769 return -ENOMEM; 770 } 771 max3100s[i]->spi = spi; 772 max3100s[i]->irq = spi->irq; 773 spin_lock_init(&max3100s[i]->conf_lock); 774 spi_set_drvdata(spi, max3100s[i]); 775 pdata = dev_get_platdata(&spi->dev); 776 max3100s[i]->crystal = pdata->crystal; 777 max3100s[i]->loopback = pdata->loopback; 778 max3100s[i]->poll_time = msecs_to_jiffies(pdata->poll_time); 779 if (pdata->poll_time > 0 && max3100s[i]->poll_time == 0) 780 max3100s[i]->poll_time = 1; 781 max3100s[i]->max3100_hw_suspend = pdata->max3100_hw_suspend; 782 max3100s[i]->minor = i; 783 timer_setup(&max3100s[i]->timer, max3100_timeout, 0); 784 785 dev_dbg(&spi->dev, "%s: adding port %d\n", __func__, i); 786 max3100s[i]->port.irq = max3100s[i]->irq; 787 max3100s[i]->port.uartclk = max3100s[i]->crystal ? 3686400 : 1843200; 788 max3100s[i]->port.fifosize = 16; 789 max3100s[i]->port.ops = &max3100_ops; 790 max3100s[i]->port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF; 791 max3100s[i]->port.line = i; 792 max3100s[i]->port.type = PORT_MAX3100; 793 max3100s[i]->port.dev = &spi->dev; 794 retval = uart_add_one_port(&max3100_uart_driver, &max3100s[i]->port); 795 if (retval < 0) 796 dev_warn(&spi->dev, 797 "uart_add_one_port failed for line %d with error %d\n", 798 i, retval); 799 800 /* set shutdown mode to save power. Will be woken-up on open */ 801 if (max3100s[i]->max3100_hw_suspend) 802 max3100s[i]->max3100_hw_suspend(1); 803 else { 804 tx = MAX3100_WC | MAX3100_SHDN; 805 max3100_sr(max3100s[i], tx, &rx); 806 } 807 mutex_unlock(&max3100s_lock); 808 return 0; 809 } 810 811 static int max3100_remove(struct spi_device *spi) 812 { 813 struct max3100_port *s = spi_get_drvdata(spi); 814 int i; 815 816 mutex_lock(&max3100s_lock); 817 818 /* find out the index for the chip we are removing */ 819 for (i = 0; i < MAX_MAX3100; i++) 820 if (max3100s[i] == s) { 821 dev_dbg(&spi->dev, "%s: removing port %d\n", __func__, i); 822 uart_remove_one_port(&max3100_uart_driver, &max3100s[i]->port); 823 kfree(max3100s[i]); 824 max3100s[i] = NULL; 825 break; 826 } 827 828 WARN_ON(i == MAX_MAX3100); 829 830 /* check if this is the last chip we have */ 831 for (i = 0; i < MAX_MAX3100; i++) 832 if (max3100s[i]) { 833 mutex_unlock(&max3100s_lock); 834 return 0; 835 } 836 pr_debug("removing max3100 driver\n"); 837 uart_unregister_driver(&max3100_uart_driver); 838 839 mutex_unlock(&max3100s_lock); 840 return 0; 841 } 842 843 #ifdef CONFIG_PM_SLEEP 844 845 static int max3100_suspend(struct device *dev) 846 { 847 struct max3100_port *s = dev_get_drvdata(dev); 848 849 dev_dbg(&s->spi->dev, "%s\n", __func__); 850 851 disable_irq(s->irq); 852 853 s->suspending = 1; 854 uart_suspend_port(&max3100_uart_driver, &s->port); 855 856 if (s->max3100_hw_suspend) 857 s->max3100_hw_suspend(1); 858 else { 859 /* no HW suspend, so do SW one */ 860 u16 tx, rx; 861 862 tx = MAX3100_WC | MAX3100_SHDN; 863 max3100_sr(s, tx, &rx); 864 } 865 return 0; 866 } 867 868 static int max3100_resume(struct device *dev) 869 { 870 struct max3100_port *s = dev_get_drvdata(dev); 871 872 dev_dbg(&s->spi->dev, "%s\n", __func__); 873 874 if (s->max3100_hw_suspend) 875 s->max3100_hw_suspend(0); 876 uart_resume_port(&max3100_uart_driver, &s->port); 877 s->suspending = 0; 878 879 enable_irq(s->irq); 880 881 s->conf_commit = 1; 882 if (s->workqueue) 883 max3100_dowork(s); 884 885 return 0; 886 } 887 888 static SIMPLE_DEV_PM_OPS(max3100_pm_ops, max3100_suspend, max3100_resume); 889 #define MAX3100_PM_OPS (&max3100_pm_ops) 890 891 #else 892 #define MAX3100_PM_OPS NULL 893 #endif 894 895 static struct spi_driver max3100_driver = { 896 .driver = { 897 .name = "max3100", 898 .pm = MAX3100_PM_OPS, 899 }, 900 .probe = max3100_probe, 901 .remove = max3100_remove, 902 }; 903 904 module_spi_driver(max3100_driver); 905 906 MODULE_DESCRIPTION("MAX3100 driver"); 907 MODULE_AUTHOR("Christian Pellegrin <chripell@evolware.org>"); 908 MODULE_LICENSE("GPL"); 909 MODULE_ALIAS("spi:max3100"); 910