drivers/media/rc/serial_ir.c

   1 /*
   2  * serial_ir.c
   3  *
   4  * serial_ir - Device driver that records pulse- and pause-lengths
   5  *             (space-lengths) between DDCD event on a serial port.
   6  *
   7  * Copyright (C) 1996,97 Ralph Metzler <rjkm@thp.uni-koeln.de>
   8  * Copyright (C) 1998 Trent Piepho <xyzzy@u.washington.edu>
   9  * Copyright (C) 1998 Ben Pfaff <blp@gnu.org>
  10  * Copyright (C) 1999 Christoph Bartelmus <lirc@bartelmus.de>
  11  * Copyright (C) 2007 Andrei Tanas <andrei@tanas.ca> (suspend/resume support)
  12  * Copyright (C) 2016 Sean Young <sean@mess.org> (port to rc-core)
  13  *  This program is free software; you can redistribute it and/or modify
  14  *  it under the terms of the GNU General Public License as published by
  15  *  the Free Software Foundation; either version 2 of the License, or
  16  *  (at your option) any later version.
  17  *
  18  *  This program is distributed in the hope that it will be useful,
  19  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  *  GNU General Public License for more details.
  22  */
  23
  24 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  25
  26 #include <linux/module.h>
  27 #include <linux/errno.h>
  28 #include <linux/interrupt.h>
  29 #include <linux/kernel.h>
  30 #include <linux/serial_reg.h>
  31 #include <linux/types.h>
  32 #include <linux/delay.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/spinlock.h>
  35 #include <media/rc-core.h>
  36
  37 struct serial_ir_hw {
  38         int signal_pin;
  39         int signal_pin_change;
  40         u8 on;
  41         u8 off;
  42         unsigned set_send_carrier:1;
  43         unsigned set_duty_cycle:1;
  44         void (*send_pulse)(unsigned int length, ktime_t edge);
  45         void (*send_space)(void);
  46         spinlock_t lock;
  47 };
  48
  49 #define IR_HOMEBREW     0
  50 #define IR_IRDEO        1
  51 #define IR_IRDEO_REMOTE 2
  52 #define IR_ANIMAX       3
  53 #define IR_IGOR         4
  54
  55 /* module parameters */
  56 static int type;
  57 static int io;
  58 static int irq;
  59 static ulong iommap;
  60 static int ioshift;
  61 static bool softcarrier = true;
  62 static bool share_irq;
  63 static int sense = -1;  /* -1 = auto, 0 = active high, 1 = active low */
  64 static bool txsense;    /* 0 = active high, 1 = active low */
  65
  66 /* forward declarations */
  67 static void send_pulse_irdeo(unsigned int length, ktime_t edge);
  68 static void send_space_irdeo(void);
  69 #ifdef CONFIG_IR_SERIAL_TRANSMITTER
  70 static void send_pulse_homebrew(unsigned int length, ktime_t edge);
  71 static void send_space_homebrew(void);
  72 #endif
  73
  74 static struct serial_ir_hw hardware[] = {
  75         [IR_HOMEBREW] = {
  76                 .lock = __SPIN_LOCK_UNLOCKED(hardware[IR_HOMEBREW].lock),
  77                 .signal_pin        = UART_MSR_DCD,
  78                 .signal_pin_change = UART_MSR_DDCD,
  79                 .on  = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
  80                 .off = (UART_MCR_RTS | UART_MCR_OUT2),
  81 #ifdef CONFIG_IR_SERIAL_TRANSMITTER
  82                 .send_pulse = send_pulse_homebrew,
  83                 .send_space = send_space_homebrew,
  84                 .set_send_carrier = true,
  85                 .set_duty_cycle = true,
  86 #endif
  87         },
  88
  89         [IR_IRDEO] = {
  90                 .lock = __SPIN_LOCK_UNLOCKED(hardware[IR_IRDEO].lock),
  91                 .signal_pin        = UART_MSR_DSR,
  92                 .signal_pin_change = UART_MSR_DDSR,
  93                 .on  = UART_MCR_OUT2,
  94                 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
  95                 .send_pulse = send_pulse_irdeo,
  96                 .send_space = send_space_irdeo,
  97                 .set_duty_cycle = true,
  98         },
  99
 100         [IR_IRDEO_REMOTE] = {
 101                 .lock = __SPIN_LOCK_UNLOCKED(hardware[IR_IRDEO_REMOTE].lock),
 102                 .signal_pin        = UART_MSR_DSR,
 103                 .signal_pin_change = UART_MSR_DDSR,
 104                 .on  = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
 105                 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
 106                 .send_pulse = send_pulse_irdeo,
 107                 .send_space = send_space_irdeo,
 108                 .set_duty_cycle = true,
 109         },
 110
 111         [IR_ANIMAX] = {
 112                 .lock = __SPIN_LOCK_UNLOCKED(hardware[IR_ANIMAX].lock),
 113                 .signal_pin        = UART_MSR_DCD,
 114                 .signal_pin_change = UART_MSR_DDCD,
 115                 .on  = 0,
 116                 .off = (UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2),
 117         },
 118
 119         [IR_IGOR] = {
 120                 .lock = __SPIN_LOCK_UNLOCKED(hardware[IR_IGOR].lock),
 121                 .signal_pin        = UART_MSR_DSR,
 122                 .signal_pin_change = UART_MSR_DDSR,
 123                 .on  = (UART_MCR_RTS | UART_MCR_OUT2 | UART_MCR_DTR),
 124                 .off = (UART_MCR_RTS | UART_MCR_OUT2),
 125 #ifdef CONFIG_IR_SERIAL_TRANSMITTER
 126                 .send_pulse = send_pulse_homebrew,
 127                 .send_space = send_space_homebrew,
 128                 .set_send_carrier = true,
 129                 .set_duty_cycle = true,
 130 #endif
 131         },
 132 };
 133
 134 #define RS_ISR_PASS_LIMIT 256
 135
 136 struct serial_ir {
 137         ktime_t lastkt;
 138         struct rc_dev *rcdev;
 139         struct platform_device *pdev;
 140         struct timer_list timeout_timer;
 141
 142         unsigned int carrier;
 143         unsigned int duty_cycle;
 144 };
 145
 146 static struct serial_ir serial_ir;
 147
 148 /* fetch serial input packet (1 byte) from register offset */
 149 static u8 sinp(int offset)
 150 {
 151         if (iommap)
 152                 /* the register is memory-mapped */
 153                 offset <<= ioshift;
 154
 155         return inb(io + offset);
 156 }
 157
 158 /* write serial output packet (1 byte) of value to register offset */
 159 static void soutp(int offset, u8 value)
 160 {
 161         if (iommap)
 162                 /* the register is memory-mapped */
 163                 offset <<= ioshift;
 164
 165         outb(value, io + offset);
 166 }
 167
 168 static void on(void)
 169 {
 170         if (txsense)
 171                 soutp(UART_MCR, hardware[type].off);
 172         else
 173                 soutp(UART_MCR, hardware[type].on);
 174 }
 175
 176 static void off(void)
 177 {
 178         if (txsense)
 179                 soutp(UART_MCR, hardware[type].on);
 180         else
 181                 soutp(UART_MCR, hardware[type].off);
 182 }
 183
 184 static void send_pulse_irdeo(unsigned int length, ktime_t target)
 185 {
 186         long rawbits;
 187         int i;
 188         unsigned char output;
 189         unsigned char chunk, shifted;
 190
 191         /* how many bits have to be sent ? */
 192         rawbits = length * 1152 / 10000;
 193         if (serial_ir.duty_cycle > 50)
 194                 chunk = 3;
 195         else
 196                 chunk = 1;
 197         for (i = 0, output = 0x7f; rawbits > 0; rawbits -= 3) {
 198                 shifted = chunk << (i * 3);
 199                 shifted >>= 1;
 200                 output &= (~shifted);
 201                 i++;
 202                 if (i == 3) {
 203                         soutp(UART_TX, output);
 204                         while (!(sinp(UART_LSR) & UART_LSR_THRE))
 205                                 ;
 206                         output = 0x7f;
 207                         i = 0;
 208                 }
 209         }
 210         if (i != 0) {
 211                 soutp(UART_TX, output);
 212                 while (!(sinp(UART_LSR) & UART_LSR_TEMT))
 213                         ;
 214         }
 215 }
 216
 217 static void send_space_irdeo(void)
 218 {
 219 }
 220
 221 #ifdef CONFIG_IR_SERIAL_TRANSMITTER
 222 static void send_pulse_homebrew_softcarrier(unsigned int length, ktime_t edge)
 223 {
 224         ktime_t now, target = ktime_add_us(edge, length);
 225         /*
 226          * delta should never exceed 4 seconds and on m68k
 227          * ndelay(s64) does not compile; so use s32 rather than s64.
 228          */
 229         s32 delta;
 230         unsigned int pulse, space;
 231
 232         /* Ensure the dividend fits into 32 bit */
 233         pulse = DIV_ROUND_CLOSEST(serial_ir.duty_cycle * (NSEC_PER_SEC / 100),
 234                                   serial_ir.carrier);
 235         space = DIV_ROUND_CLOSEST((100 - serial_ir.duty_cycle) *
 236                                   (NSEC_PER_SEC / 100), serial_ir.carrier);
 237
 238         for (;;) {
 239                 now = ktime_get();
 240                 if (ktime_compare(now, target) >= 0)
 241                         break;
 242                 on();
 243                 edge = ktime_add_ns(edge, pulse);
 244                 delta = ktime_to_ns(ktime_sub(edge, now));
 245                 if (delta > 0)
 246                         ndelay(delta);
 247                 now = ktime_get();
 248                 off();
 249                 if (ktime_compare(now, target) >= 0)
 250                         break;
 251                 edge = ktime_add_ns(edge, space);
 252                 delta = ktime_to_ns(ktime_sub(edge, now));
 253                 if (delta > 0)
 254                         ndelay(delta);
 255         }
 256 }
 257
 258 static void send_pulse_homebrew(unsigned int length, ktime_t edge)
 259 {
 260         if (softcarrier)
 261                 send_pulse_homebrew_softcarrier(length, edge);
 262         else
 263                 on();
 264 }
 265
 266 static void send_space_homebrew(void)
 267 {
 268         off();
 269 }
 270 #endif
 271
 272 static void frbwrite(unsigned int l, bool is_pulse)
 273 {
 274         /* simple noise filter */
 275         static unsigned int ptr, pulse, space;
 276         struct ir_raw_event ev = {};
 277
 278         if (ptr > 0 && is_pulse) {
 279                 pulse += l;
 280                 if (pulse > 250000) {
 281                         ev.duration = space;
 282                         ev.pulse = false;
 283                         ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
 284                         ev.duration = pulse;
 285                         ev.pulse = true;
 286                         ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
 287                         ptr = 0;
 288                         pulse = 0;
 289                 }
 290                 return;
 291         }
 292         if (!is_pulse) {
 293                 if (ptr == 0) {
 294                         if (l > 20000000) {
 295                                 space = l;
 296                                 ptr++;
 297                                 return;
 298                         }
 299                 } else {
 300                         if (l > 20000000) {
 301                                 space += pulse;
 302                                 if (space > IR_MAX_DURATION)
 303                                         space = IR_MAX_DURATION;
 304                                 space += l;
 305                                 if (space > IR_MAX_DURATION)
 306                                         space = IR_MAX_DURATION;
 307                                 pulse = 0;
 308                                 return;
 309                         }
 310
 311                         ev.duration = space;
 312                         ev.pulse = false;
 313                         ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
 314                         ev.duration = pulse;
 315                         ev.pulse = true;
 316                         ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
 317                         ptr = 0;
 318                         pulse = 0;
 319                 }
 320         }
 321
 322         ev.duration = l;
 323         ev.pulse = is_pulse;
 324         ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
 325 }
 326
 327 static irqreturn_t serial_ir_irq_handler(int i, void *blah)
 328 {
 329         ktime_t kt;
 330         int counter, dcd;
 331         u8 status;
 332         ktime_t delkt;
 333         unsigned int data;
 334         static int last_dcd = -1;
 335
 336         if ((sinp(UART_IIR) & UART_IIR_NO_INT)) {
 337                 /* not our interrupt */
 338                 return IRQ_NONE;
 339         }
 340
 341         counter = 0;
 342         do {
 343                 counter++;
 344                 status = sinp(UART_MSR);
 345                 if (counter > RS_ISR_PASS_LIMIT) {
 346                         dev_err(&serial_ir.pdev->dev, "Trapped in interrupt");
 347                         break;
 348                 }
 349                 if ((status & hardware[type].signal_pin_change) &&
 350                     sense != -1) {
 351                         /* get current time */
 352                         kt = ktime_get();
 353
 354                         /*
 355                          * The driver needs to know if your receiver is
 356                          * active high or active low, or the space/pulse
 357                          * sense could be inverted.
 358                          */
 359
 360                         /* calc time since last interrupt in nanoseconds */
 361                         dcd = (status & hardware[type].signal_pin) ? 1 : 0;
 362
 363                         if (dcd == last_dcd) {
 364                                 dev_err(&serial_ir.pdev->dev,
 365                                         "ignoring spike: %d %d %lldns %lldns\n",
 366                                         dcd, sense, ktime_to_ns(kt),
 367                                         ktime_to_ns(serial_ir.lastkt));
 368                                 continue;
 369                         }
 370
 371                         delkt = ktime_sub(kt, serial_ir.lastkt);
 372                         if (ktime_compare(delkt, ktime_set(15, 0)) > 0) {
 373                                 data = IR_MAX_DURATION; /* really long time */
 374                                 if (!(dcd ^ sense)) {
 375                                         /* sanity check */
 376                                         dev_err(&serial_ir.pdev->dev,
 377                                                 "dcd unexpected: %d %d %lldns %lldns\n",
 378                                                 dcd, sense, ktime_to_ns(kt),
 379                                                 ktime_to_ns(serial_ir.lastkt));
 380                                         /*
 381                                          * detecting pulse while this
 382                                          * MUST be a space!
 383                                          */
 384                                         sense = sense ? 0 : 1;
 385                                 }
 386                         } else {
 387                                 data = ktime_to_ns(delkt);
 388                         }
 389                         frbwrite(data, !(dcd ^ sense));
 390                         serial_ir.lastkt = kt;
 391                         last_dcd = dcd;
 392                 }
 393         } while (!(sinp(UART_IIR) & UART_IIR_NO_INT)); /* still pending ? */
 394
 395         mod_timer(&serial_ir.timeout_timer,
 396                   jiffies + nsecs_to_jiffies(serial_ir.rcdev->timeout));
 397
 398         ir_raw_event_handle(serial_ir.rcdev);
 399
 400         return IRQ_HANDLED;
 401 }
 402
 403 static int hardware_init_port(void)
 404 {
 405         u8 scratch, scratch2, scratch3;
 406
 407         /*
 408          * This is a simple port existence test, borrowed from the autoconfig
 409          * function in drivers/tty/serial/8250/8250_port.c
 410          */
 411         scratch = sinp(UART_IER);
 412         soutp(UART_IER, 0);
 413 #ifdef __i386__
 414         outb(0xff, 0x080);
 415 #endif
 416         scratch2 = sinp(UART_IER) & 0x0f;
 417         soutp(UART_IER, 0x0f);
 418 #ifdef __i386__
 419         outb(0x00, 0x080);
 420 #endif
 421         scratch3 = sinp(UART_IER) & 0x0f;
 422         soutp(UART_IER, scratch);
 423         if (scratch2 != 0 || scratch3 != 0x0f) {
 424                 /* we fail, there's nothing here */
 425                 pr_err("port existence test failed, cannot continue\n");
 426                 return -ENODEV;
 427         }
 428
 429         /* Set DLAB 0. */
 430         soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
 431
 432         /* First of all, disable all interrupts */
 433         soutp(UART_IER, sinp(UART_IER) &
 434               (~(UART_IER_MSI | UART_IER_RLSI | UART_IER_THRI | UART_IER_RDI)));
 435
 436         /* Clear registers. */
 437         sinp(UART_LSR);
 438         sinp(UART_RX);
 439         sinp(UART_IIR);
 440         sinp(UART_MSR);
 441
 442         /* Set line for power source */
 443         off();
 444
 445         /* Clear registers again to be sure. */
 446         sinp(UART_LSR);
 447         sinp(UART_RX);
 448         sinp(UART_IIR);
 449         sinp(UART_MSR);
 450
 451         switch (type) {
 452         case IR_IRDEO:
 453         case IR_IRDEO_REMOTE:
 454                 /* setup port to 7N1 @ 115200 Baud */
 455                 /* 7N1+start = 9 bits at 115200 ~ 3 bits at 38kHz */
 456
 457                 /* Set DLAB 1. */
 458                 soutp(UART_LCR, sinp(UART_LCR) | UART_LCR_DLAB);
 459                 /* Set divisor to 1 => 115200 Baud */
 460                 soutp(UART_DLM, 0);
 461                 soutp(UART_DLL, 1);
 462                 /* Set DLAB 0 +  7N1 */
 463                 soutp(UART_LCR, UART_LCR_WLEN7);
 464                 /* THR interrupt already disabled at this point */
 465                 break;
 466         default:
 467                 break;
 468         }
 469
 470         return 0;
 471 }
 472
 473 static void serial_ir_timeout(struct timer_list *unused)
 474 {
 475         struct ir_raw_event ev = {
 476                 .timeout = true,
 477                 .duration = serial_ir.rcdev->timeout
 478         };
 479         ir_raw_event_store_with_filter(serial_ir.rcdev, &ev);
 480         ir_raw_event_handle(serial_ir.rcdev);
 481 }
 482
 483 /* Needed by serial_ir_probe() */
 484 static int serial_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
 485                         unsigned int count);
 486 static int serial_ir_tx_duty_cycle(struct rc_dev *dev, u32 cycle);
 487 static int serial_ir_tx_carrier(struct rc_dev *dev, u32 carrier);
 488 static int serial_ir_open(struct rc_dev *rcdev);
 489 static void serial_ir_close(struct rc_dev *rcdev);
 490
 491 static int serial_ir_probe(struct platform_device *dev)
 492 {
 493         struct rc_dev *rcdev;
 494         int i, nlow, nhigh, result;
 495
 496         rcdev = devm_rc_allocate_device(&dev->dev, RC_DRIVER_IR_RAW);
 497         if (!rcdev)
 498                 return -ENOMEM;
 499
 500         if (hardware[type].send_pulse && hardware[type].send_space)
 501                 rcdev->tx_ir = serial_ir_tx;
 502         if (hardware[type].set_send_carrier)
 503                 rcdev->s_tx_carrier = serial_ir_tx_carrier;
 504         if (hardware[type].set_duty_cycle)
 505                 rcdev->s_tx_duty_cycle = serial_ir_tx_duty_cycle;
 506
 507         switch (type) {
 508         case IR_HOMEBREW:
 509                 rcdev->device_name = "Serial IR type home-brew";
 510                 break;
 511         case IR_IRDEO:
 512                 rcdev->device_name = "Serial IR type IRdeo";
 513                 break;
 514         case IR_IRDEO_REMOTE:
 515                 rcdev->device_name = "Serial IR type IRdeo remote";
 516                 break;
 517         case IR_ANIMAX:
 518                 rcdev->device_name = "Serial IR type AnimaX";
 519                 break;
 520         case IR_IGOR:
 521                 rcdev->device_name = "Serial IR type IgorPlug";
 522                 break;
 523         }
 524
 525         rcdev->input_phys = KBUILD_MODNAME "/input0";
 526         rcdev->input_id.bustype = BUS_HOST;
 527         rcdev->input_id.vendor = 0x0001;
 528         rcdev->input_id.product = 0x0001;
 529         rcdev->input_id.version = 0x0100;
 530         rcdev->open = serial_ir_open;
 531         rcdev->close = serial_ir_close;
 532         rcdev->dev.parent = &serial_ir.pdev->dev;
 533         rcdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 534         rcdev->driver_name = KBUILD_MODNAME;
 535         rcdev->map_name = RC_MAP_RC6_MCE;
 536         rcdev->min_timeout = 1;
 537         rcdev->timeout = IR_DEFAULT_TIMEOUT;
 538         rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
 539         rcdev->rx_resolution = 250000;
 540
 541         serial_ir.rcdev = rcdev;
 542
 543         timer_setup(&serial_ir.timeout_timer, serial_ir_timeout, 0);
 544
 545         result = devm_request_irq(&dev->dev, irq, serial_ir_irq_handler,
 546                                   share_irq ? IRQF_SHARED : 0,
 547                                   KBUILD_MODNAME, &hardware);
 548         if (result < 0) {
 549                 if (result == -EBUSY)
 550                         dev_err(&dev->dev, "IRQ %d busy\n", irq);
 551                 else if (result == -EINVAL)
 552                         dev_err(&dev->dev, "Bad irq number or handler\n");
 553                 return result;
 554         }
 555
 556         /* Reserve io region. */
 557         if ((iommap &&
 558              (devm_request_mem_region(&dev->dev, iommap, 8 << ioshift,
 559                                       KBUILD_MODNAME) == NULL)) ||
 560              (!iommap && (devm_request_region(&dev->dev, io, 8,
 561                           KBUILD_MODNAME) == NULL))) {
 562                 dev_err(&dev->dev, "port %04x already in use\n", io);
 563                 dev_warn(&dev->dev, "use 'setserial /dev/ttySX uart none'\n");
 564                 dev_warn(&dev->dev,
 565                          "or compile the serial port driver as module and\n");
 566                 dev_warn(&dev->dev, "make sure this module is loaded first\n");
 567                 return -EBUSY;
 568         }
 569
 570         result = hardware_init_port();
 571         if (result < 0)
 572                 return result;
 573
 574         /* Initialize pulse/space widths */
 575         serial_ir.duty_cycle = 50;
 576         serial_ir.carrier = 38000;
 577
 578         /* If pin is high, then this must be an active low receiver. */
 579         if (sense == -1) {
 580                 /* wait 1/2 sec for the power supply */
 581                 msleep(500);
 582
 583                 /*
 584                  * probe 9 times every 0.04s, collect "votes" for
 585                  * active high/low
 586                  */
 587                 nlow = 0;
 588                 nhigh = 0;
 589                 for (i = 0; i < 9; i++) {
 590                         if (sinp(UART_MSR) & hardware[type].signal_pin)
 591                                 nlow++;
 592                         else
 593                                 nhigh++;
 594                         msleep(40);
 595                 }
 596                 sense = nlow >= nhigh ? 1 : 0;
 597                 dev_info(&dev->dev, "auto-detected active %s receiver\n",
 598                          sense ? "low" : "high");
 599         } else
 600                 dev_info(&dev->dev, "Manually using active %s receiver\n",
 601                          sense ? "low" : "high");
 602
 603         dev_dbg(&dev->dev, "Interrupt %d, port %04x obtained\n", irq, io);
 604
 605         return devm_rc_register_device(&dev->dev, rcdev);
 606 }
 607
 608 static int serial_ir_open(struct rc_dev *rcdev)
 609 {
 610         unsigned long flags;
 611
 612         /* initialize timestamp */
 613         serial_ir.lastkt = ktime_get();
 614
 615         spin_lock_irqsave(&hardware[type].lock, flags);
 616
 617         /* Set DLAB 0. */
 618         soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
 619
 620         soutp(UART_IER, sinp(UART_IER) | UART_IER_MSI);
 621
 622         spin_unlock_irqrestore(&hardware[type].lock, flags);
 623
 624         return 0;
 625 }
 626
 627 static void serial_ir_close(struct rc_dev *rcdev)
 628 {
 629         unsigned long flags;
 630
 631         spin_lock_irqsave(&hardware[type].lock, flags);
 632
 633         /* Set DLAB 0. */
 634         soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
 635
 636         /* First of all, disable all interrupts */
 637         soutp(UART_IER, sinp(UART_IER) &
 638               (~(UART_IER_MSI | UART_IER_RLSI | UART_IER_THRI | UART_IER_RDI)));
 639         spin_unlock_irqrestore(&hardware[type].lock, flags);
 640 }
 641
 642 static int serial_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
 643                         unsigned int count)
 644 {
 645         unsigned long flags;
 646         ktime_t edge;
 647         s64 delta;
 648         int i;
 649
 650         spin_lock_irqsave(&hardware[type].lock, flags);
 651         if (type == IR_IRDEO) {
 652                 /* DTR, RTS down */
 653                 on();
 654         }
 655
 656         edge = ktime_get();
 657         for (i = 0; i < count; i++) {
 658                 if (i % 2)
 659                         hardware[type].send_space();
 660                 else
 661                         hardware[type].send_pulse(txbuf[i], edge);
 662
 663                 edge = ktime_add_us(edge, txbuf[i]);
 664                 delta = ktime_us_delta(edge, ktime_get());
 665                 if (delta > 25) {
 666                         spin_unlock_irqrestore(&hardware[type].lock, flags);
 667                         usleep_range(delta - 25, delta + 25);
 668                         spin_lock_irqsave(&hardware[type].lock, flags);
 669                 } else if (delta > 0) {
 670                         udelay(delta);
 671                 }
 672         }
 673         off();
 674         spin_unlock_irqrestore(&hardware[type].lock, flags);
 675         return count;
 676 }
 677
 678 static int serial_ir_tx_duty_cycle(struct rc_dev *dev, u32 cycle)
 679 {
 680         serial_ir.duty_cycle = cycle;
 681         return 0;
 682 }
 683
 684 static int serial_ir_tx_carrier(struct rc_dev *dev, u32 carrier)
 685 {
 686         if (carrier > 500000 || carrier < 20000)
 687                 return -EINVAL;
 688
 689         serial_ir.carrier = carrier;
 690         return 0;
 691 }
 692
 693 static int serial_ir_suspend(struct platform_device *dev,
 694                              pm_message_t state)
 695 {
 696         /* Set DLAB 0. */
 697         soutp(UART_LCR, sinp(UART_LCR) & (~UART_LCR_DLAB));
 698
 699         /* Disable all interrupts */
 700         soutp(UART_IER, sinp(UART_IER) &
 701               (~(UART_IER_MSI | UART_IER_RLSI | UART_IER_THRI | UART_IER_RDI)));
 702
 703         /* Clear registers. */
 704         sinp(UART_LSR);
 705         sinp(UART_RX);
 706         sinp(UART_IIR);
 707         sinp(UART_MSR);
 708
 709         return 0;
 710 }
 711
 712 static int serial_ir_resume(struct platform_device *dev)
 713 {
 714         unsigned long flags;
 715         int result;
 716
 717         result = hardware_init_port();
 718         if (result < 0)
 719                 return result;
 720
 721         spin_lock_irqsave(&hardware[type].lock, flags);
 722         /* Enable Interrupt */
 723         serial_ir.lastkt = ktime_get();
 724         soutp(UART_IER, sinp(UART_IER) | UART_IER_MSI);
 725         off();
 726
 727         spin_unlock_irqrestore(&hardware[type].lock, flags);
 728
 729         return 0;
 730 }
 731
 732 static struct platform_driver serial_ir_driver = {
 733         .probe          = serial_ir_probe,
 734         .suspend        = serial_ir_suspend,
 735         .resume         = serial_ir_resume,
 736         .driver         = {
 737                 .name   = "serial_ir",
 738         },
 739 };
 740
 741 static int __init serial_ir_init(void)
 742 {
 743         int result;
 744
 745         result = platform_driver_register(&serial_ir_driver);
 746         if (result)
 747                 return result;
 748
 749         serial_ir.pdev = platform_device_alloc("serial_ir", 0);
 750         if (!serial_ir.pdev) {
 751                 result = -ENOMEM;
 752                 goto exit_driver_unregister;
 753         }
 754
 755         result = platform_device_add(serial_ir.pdev);
 756         if (result)
 757                 goto exit_device_put;
 758
 759         return 0;
 760
 761 exit_device_put:
 762         platform_device_put(serial_ir.pdev);
 763 exit_driver_unregister:
 764         platform_driver_unregister(&serial_ir_driver);
 765         return result;
 766 }
 767
 768 static void serial_ir_exit(void)
 769 {
 770         platform_device_unregister(serial_ir.pdev);
 771         platform_driver_unregister(&serial_ir_driver);
 772 }
 773
 774 static int __init serial_ir_init_module(void)
 775 {
 776         switch (type) {
 777         case IR_HOMEBREW:
 778         case IR_IRDEO:
 779         case IR_IRDEO_REMOTE:
 780         case IR_ANIMAX:
 781         case IR_IGOR:
 782                 /* if nothing specified, use ttyS0/com1 and irq 4 */
 783                 io = io ? io : 0x3f8;
 784                 irq = irq ? irq : 4;
 785                 break;
 786         default:
 787                 return -EINVAL;
 788         }
 789         if (!softcarrier) {
 790                 switch (type) {
 791                 case IR_HOMEBREW:
 792                 case IR_IGOR:
 793                         hardware[type].set_send_carrier = false;
 794                         hardware[type].set_duty_cycle = false;
 795                         break;
 796                 }
 797         }
 798
 799         /* make sure sense is either -1, 0, or 1 */
 800         if (sense != -1)
 801                 sense = !!sense;
 802
 803         return serial_ir_init();
 804 }
 805
 806 static void __exit serial_ir_exit_module(void)
 807 {
 808         del_timer_sync(&serial_ir.timeout_timer);
 809         serial_ir_exit();
 810 }
 811
 812 module_init(serial_ir_init_module);
 813 module_exit(serial_ir_exit_module);
 814
 815 MODULE_DESCRIPTION("Infra-red receiver driver for serial ports.");
 816 MODULE_AUTHOR("Ralph Metzler, Trent Piepho, Ben Pfaff, Christoph Bartelmus, Andrei Tanas");
 817 MODULE_LICENSE("GPL");
 818
 819 module_param(type, int, 0444);
 820 MODULE_PARM_DESC(type, "Hardware type (0 = home-brew, 1 = IRdeo, 2 = IRdeo Remote, 3 = AnimaX, 4 = IgorPlug");
 821
 822 module_param_hw(io, int, ioport, 0444);
 823 MODULE_PARM_DESC(io, "I/O address base (0x3f8 or 0x2f8)");
 824
 825 /* some architectures (e.g. intel xscale) have memory mapped registers */
 826 module_param_hw(iommap, ulong, other, 0444);
 827 MODULE_PARM_DESC(iommap, "physical base for memory mapped I/O (0 = no memory mapped io)");
 828
 829 /*
 830  * some architectures (e.g. intel xscale) align the 8bit serial registers
 831  * on 32bit word boundaries.
 832  * See linux-kernel/drivers/tty/serial/8250/8250.c serial_in()/out()
 833  */
 834 module_param_hw(ioshift, int, other, 0444);
 835 MODULE_PARM_DESC(ioshift, "shift I/O register offset (0 = no shift)");
 836
 837 module_param_hw(irq, int, irq, 0444);
 838 MODULE_PARM_DESC(irq, "Interrupt (4 or 3)");
 839
 840 module_param_hw(share_irq, bool, other, 0444);
 841 MODULE_PARM_DESC(share_irq, "Share interrupts (0 = off, 1 = on)");
 842
 843 module_param(sense, int, 0444);
 844 MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit (0 = active high, 1 = active low )");
 845
 846 #ifdef CONFIG_IR_SERIAL_TRANSMITTER
 847 module_param(txsense, bool, 0444);
 848 MODULE_PARM_DESC(txsense, "Sense of transmitter circuit (0 = active high, 1 = active low )");
 849 #endif
 850
 851 module_param(softcarrier, bool, 0444);
 852 MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");