target/linux/brcm2708/patches-3.10/008-lirc_rpi_driver.patch

   1 --- a/drivers/staging/media/lirc/Kconfig
   2 +++ b/drivers/staging/media/lirc/Kconfig
   3 @@ -38,6 +38,12 @@ config LIRC_PARALLEL
   4         help
   5           Driver for Homebrew Parallel Port Receivers
   6
   7 +config LIRC_RPI
   8 +       tristate "Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi"
   9 +       depends on LIRC
  10 +       help
  11 +         Driver for Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi
  12 +
  13  config LIRC_SASEM
  14         tristate "Sasem USB IR Remote"
  15         depends on LIRC && USB
  16 --- /dev/null
  17 +++ b/drivers/staging/media/lirc/lirc_rpi.c
  18 @@ -0,0 +1,692 @@
  19 +/*
  20 + * lirc_rpi.c
  21 + *
  22 + * lirc_rpi - Device driver that records pulse- and pause-lengths
  23 + *           (space-lengths) (just like the lirc_serial driver does)
  24 + *           between GPIO interrupt events on the Raspberry Pi.
  25 + *           Lots of code has been taken from the lirc_serial module,
  26 + *           so I would like say thanks to the authors.
  27 + *
  28 + * Copyright (C) 2012 Aron Robert Szabo <aron@reon.hu>,
  29 + *                   Michael Bishop <cleverca22@gmail.com>
  30 + *  This program is free software; you can redistribute it and/or modify
  31 + *  it under the terms of the GNU General Public License as published by
  32 + *  the Free Software Foundation; either version 2 of the License, or
  33 + *  (at your option) any later version.
  34 + *
  35 + *  This program is distributed in the hope that it will be useful,
  36 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  37 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  38 + *  GNU General Public License for more details.
  39 + *
  40 + *  You should have received a copy of the GNU General Public License
  41 + *  along with this program; if not, write to the Free Software
  42 + *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  43 + */
  44 +
  45 +#include <linux/module.h>
  46 +#include <linux/errno.h>
  47 +#include <linux/interrupt.h>
  48 +#include <linux/sched.h>
  49 +#include <linux/kernel.h>
  50 +#include <linux/time.h>
  51 +#include <linux/string.h>
  52 +#include <linux/delay.h>
  53 +#include <linux/platform_device.h>
  54 +#include <linux/irq.h>
  55 +#include <linux/spinlock.h>
  56 +#include <media/lirc.h>
  57 +#include <media/lirc_dev.h>
  58 +#include <linux/gpio.h>
  59 +
  60 +#define LIRC_DRIVER_NAME "lirc_rpi"
  61 +#define RBUF_LEN 256
  62 +#define LIRC_TRANSMITTER_LATENCY 256
  63 +
  64 +#ifndef MAX_UDELAY_MS
  65 +#define MAX_UDELAY_US 5000
  66 +#else
  67 +#define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
  68 +#endif
  69 +
  70 +#define dprintk(fmt, args...)                                  \
  71 +       do {                                                    \
  72 +               if (debug)                                      \
  73 +                       printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
  74 +                              fmt, ## args);                   \
  75 +       } while (0)
  76 +
  77 +/* module parameters */
  78 +
  79 +/* set the default GPIO input pin */
  80 +static int gpio_in_pin = 18;
  81 +/* set the default GPIO output pin */
  82 +static int gpio_out_pin = 17;
  83 +/* enable debugging messages */
  84 +static int debug;
  85 +/* -1 = auto, 0 = active high, 1 = active low */
  86 +static int sense = -1;
  87 +/* use softcarrier by default */
  88 +static int softcarrier = 1;
  89 +/* 0 = do not invert output, 1 = invert output */
  90 +static int invert = 0;
  91 +
  92 +struct gpio_chip *gpiochip;
  93 +struct irq_chip *irqchip;
  94 +struct irq_data *irqdata;
  95 +
  96 +/* forward declarations */
  97 +static long send_pulse(unsigned long length);
  98 +static void send_space(long length);
  99 +static void lirc_rpi_exit(void);
 100 +
 101 +int valid_gpio_pins[] = { 0, 1, 4, 8, 7, 9, 10, 11, 14, 15, 17, 18, 21, 22, 23,
 102 +       24, 25 };
 103 +
 104 +static struct platform_device *lirc_rpi_dev;
 105 +static struct timeval lasttv = { 0, 0 };
 106 +static struct lirc_buffer rbuf;
 107 +static spinlock_t lock;
 108 +
 109 +/* initialized/set in init_timing_params() */
 110 +static unsigned int freq = 38000;
 111 +static unsigned int duty_cycle = 50;
 112 +static unsigned long period;
 113 +static unsigned long pulse_width;
 114 +static unsigned long space_width;
 115 +
 116 +static void safe_udelay(unsigned long usecs)
 117 +{
 118 +       while (usecs > MAX_UDELAY_US) {
 119 +               udelay(MAX_UDELAY_US);
 120 +               usecs -= MAX_UDELAY_US;
 121 +       }
 122 +       udelay(usecs);
 123 +}
 124 +
 125 +static int init_timing_params(unsigned int new_duty_cycle,
 126 +       unsigned int new_freq)
 127 +{
 128 +       /*
 129 +        * period, pulse/space width are kept with 8 binary places -
 130 +        * IE multiplied by 256.
 131 +        */
 132 +       if (256 * 1000000L / new_freq * new_duty_cycle / 100 <=
 133 +           LIRC_TRANSMITTER_LATENCY)
 134 +               return -EINVAL;
 135 +       if (256 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
 136 +           LIRC_TRANSMITTER_LATENCY)
 137 +               return -EINVAL;
 138 +       duty_cycle = new_duty_cycle;
 139 +       freq = new_freq;
 140 +       period = 256 * 1000000L / freq;
 141 +       pulse_width = period * duty_cycle / 100;
 142 +       space_width = period - pulse_width;
 143 +       dprintk("in init_timing_params, freq=%d pulse=%ld, "
 144 +               "space=%ld\n", freq, pulse_width, space_width);
 145 +       return 0;
 146 +}
 147 +
 148 +static long send_pulse_softcarrier(unsigned long length)
 149 +{
 150 +       int flag;
 151 +       unsigned long actual, target, d;
 152 +
 153 +       length <<= 8;
 154 +
 155 +       actual = 0; target = 0; flag = 0;
 156 +       while (actual < length) {
 157 +               if (flag) {
 158 +                       gpiochip->set(gpiochip, gpio_out_pin, invert);
 159 +                       target += space_width;
 160 +               } else {
 161 +                       gpiochip->set(gpiochip, gpio_out_pin, !invert);
 162 +                       target += pulse_width;
 163 +               }
 164 +               d = (target - actual -
 165 +                    LIRC_TRANSMITTER_LATENCY + 128) >> 8;
 166 +               /*
 167 +                * Note - we've checked in ioctl that the pulse/space
 168 +                * widths are big enough so that d is > 0
 169 +                */
 170 +               udelay(d);
 171 +               actual += (d << 8) + LIRC_TRANSMITTER_LATENCY;
 172 +               flag = !flag;
 173 +       }
 174 +       return (actual-length) >> 8;
 175 +}
 176 +
 177 +static long send_pulse(unsigned long length)
 178 +{
 179 +       if (length <= 0)
 180 +               return 0;
 181 +
 182 +       if (softcarrier) {
 183 +               return send_pulse_softcarrier(length);
 184 +       } else {
 185 +               gpiochip->set(gpiochip, gpio_out_pin, !invert);
 186 +               safe_udelay(length);
 187 +               return 0;
 188 +       }
 189 +}
 190 +
 191 +static void send_space(long length)
 192 +{
 193 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 194 +       if (length <= 0)
 195 +               return;
 196 +       safe_udelay(length);
 197 +}
 198 +
 199 +static void rbwrite(int l)
 200 +{
 201 +       if (lirc_buffer_full(&rbuf)) {
 202 +               /* no new signals will be accepted */
 203 +               dprintk("Buffer overrun\n");
 204 +               return;
 205 +       }
 206 +       lirc_buffer_write(&rbuf, (void *)&l);
 207 +}
 208 +
 209 +static void frbwrite(int l)
 210 +{
 211 +       /* simple noise filter */
 212 +       static int pulse, space;
 213 +       static unsigned int ptr;
 214 +
 215 +       if (ptr > 0 && (l & PULSE_BIT)) {
 216 +               pulse += l & PULSE_MASK;
 217 +               if (pulse > 250) {
 218 +                       rbwrite(space);
 219 +                       rbwrite(pulse | PULSE_BIT);
 220 +                       ptr = 0;
 221 +                       pulse = 0;
 222 +               }
 223 +               return;
 224 +       }
 225 +       if (!(l & PULSE_BIT)) {
 226 +               if (ptr == 0) {
 227 +                       if (l > 20000) {
 228 +                               space = l;
 229 +                               ptr++;
 230 +                               return;
 231 +                       }
 232 +               } else {
 233 +                       if (l > 20000) {
 234 +                               space += pulse;
 235 +                               if (space > PULSE_MASK)
 236 +                                       space = PULSE_MASK;
 237 +                               space += l;
 238 +                               if (space > PULSE_MASK)
 239 +                                       space = PULSE_MASK;
 240 +                               pulse = 0;
 241 +                               return;
 242 +                       }
 243 +                       rbwrite(space);
 244 +                       rbwrite(pulse | PULSE_BIT);
 245 +                       ptr = 0;
 246 +                       pulse = 0;
 247 +               }
 248 +       }
 249 +       rbwrite(l);
 250 +}
 251 +
 252 +static irqreturn_t irq_handler(int i, void *blah, struct pt_regs *regs)
 253 +{
 254 +       struct timeval tv;
 255 +       long deltv;
 256 +       int data;
 257 +       int signal;
 258 +
 259 +       /* use the GPIO signal level */
 260 +       signal = gpiochip->get(gpiochip, gpio_in_pin);
 261 +
 262 +       /* unmask the irq */
 263 +       irqchip->irq_unmask(irqdata);
 264 +
 265 +       if (sense != -1) {
 266 +               /* get current time */
 267 +               do_gettimeofday(&tv);
 268 +
 269 +               /* calc time since last interrupt in microseconds */
 270 +               deltv = tv.tv_sec-lasttv.tv_sec;
 271 +               if (tv.tv_sec < lasttv.tv_sec ||
 272 +                   (tv.tv_sec == lasttv.tv_sec &&
 273 +                    tv.tv_usec < lasttv.tv_usec)) {
 274 +                       printk(KERN_WARNING LIRC_DRIVER_NAME
 275 +                              ": AIEEEE: your clock just jumped backwards\n");
 276 +                       printk(KERN_WARNING LIRC_DRIVER_NAME
 277 +                              ": %d %d %lx %lx %lx %lx\n", signal, sense,
 278 +                              tv.tv_sec, lasttv.tv_sec,
 279 +                              tv.tv_usec, lasttv.tv_usec);
 280 +                       data = PULSE_MASK;
 281 +               } else if (deltv > 15) {
 282 +                       data = PULSE_MASK; /* really long time */
 283 +                       if (!(signal^sense)) {
 284 +                               /* sanity check */
 285 +                               printk(KERN_WARNING LIRC_DRIVER_NAME
 286 +                                      ": AIEEEE: %d %d %lx %lx %lx %lx\n",
 287 +                                      signal, sense, tv.tv_sec, lasttv.tv_sec,
 288 +                                      tv.tv_usec, lasttv.tv_usec);
 289 +                               /*
 290 +                                * detecting pulse while this
 291 +                                * MUST be a space!
 292 +                                */
 293 +                               sense = sense ? 0 : 1;
 294 +                       }
 295 +               } else {
 296 +                       data = (int) (deltv*1000000 +
 297 +                                     (tv.tv_usec - lasttv.tv_usec));
 298 +               }
 299 +               frbwrite(signal^sense ? data : (data|PULSE_BIT));
 300 +               lasttv = tv;
 301 +               wake_up_interruptible(&rbuf.wait_poll);
 302 +       }
 303 +
 304 +       return IRQ_HANDLED;
 305 +}
 306 +
 307 +static int is_right_chip(struct gpio_chip *chip, void *data)
 308 +{
 309 +       dprintk("is_right_chip %s %d\n", chip->label, strcmp(data, chip->label));
 310 +
 311 +       if (strcmp(data, chip->label) == 0)
 312 +               return 1;
 313 +       return 0;
 314 +}
 315 +
 316 +static int init_port(void)
 317 +{
 318 +       int i, nlow, nhigh, ret, irq;
 319 +
 320 +       gpiochip = gpiochip_find("bcm2708_gpio", is_right_chip);
 321 +
 322 +       if (!gpiochip)
 323 +               return -ENODEV;
 324 +
 325 +       if (gpio_request(gpio_out_pin, LIRC_DRIVER_NAME " ir/out")) {
 326 +               printk(KERN_ALERT LIRC_DRIVER_NAME
 327 +                      ": cant claim gpio pin %d\n", gpio_out_pin);
 328 +               ret = -ENODEV;
 329 +               goto exit_init_port;
 330 +       }
 331 +
 332 +       if (gpio_request(gpio_in_pin, LIRC_DRIVER_NAME " ir/in")) {
 333 +               printk(KERN_ALERT LIRC_DRIVER_NAME
 334 +                      ": cant claim gpio pin %d\n", gpio_in_pin);
 335 +               ret = -ENODEV;
 336 +               goto exit_gpio_free_out_pin;
 337 +       }
 338 +
 339 +       gpiochip->direction_input(gpiochip, gpio_in_pin);
 340 +       gpiochip->direction_output(gpiochip, gpio_out_pin, 1);
 341 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 342 +
 343 +       irq = gpiochip->to_irq(gpiochip, gpio_in_pin);
 344 +       dprintk("to_irq %d\n", irq);
 345 +       irqdata = irq_get_irq_data(irq);
 346 +
 347 +       if (irqdata && irqdata->chip) {
 348 +               irqchip = irqdata->chip;
 349 +       } else {
 350 +               ret = -ENODEV;
 351 +               goto exit_gpio_free_in_pin;
 352 +       }
 353 +
 354 +       /* if pin is high, then this must be an active low receiver. */
 355 +       if (sense == -1) {
 356 +               /* wait 1/2 sec for the power supply */
 357 +               msleep(500);
 358 +
 359 +               /*
 360 +                * probe 9 times every 0.04s, collect "votes" for
 361 +                * active high/low
 362 +                */
 363 +               nlow = 0;
 364 +               nhigh = 0;
 365 +               for (i = 0; i < 9; i++) {
 366 +                       if (gpiochip->get(gpiochip, gpio_in_pin))
 367 +                               nlow++;
 368 +                       else
 369 +                               nhigh++;
 370 +                       msleep(40);
 371 +               }
 372 +               sense = (nlow >= nhigh ? 1 : 0);
 373 +               printk(KERN_INFO LIRC_DRIVER_NAME
 374 +                      ": auto-detected active %s receiver on GPIO pin %d\n",
 375 +                      sense ? "low" : "high", gpio_in_pin);
 376 +       } else {
 377 +               printk(KERN_INFO LIRC_DRIVER_NAME
 378 +                      ": manually using active %s receiver on GPIO pin %d\n",
 379 +                      sense ? "low" : "high", gpio_in_pin);
 380 +       }
 381 +
 382 +       return 0;
 383 +
 384 +       exit_gpio_free_in_pin:
 385 +       gpio_free(gpio_in_pin);
 386 +
 387 +       exit_gpio_free_out_pin:
 388 +       gpio_free(gpio_out_pin);
 389 +
 390 +       exit_init_port:
 391 +       return ret;
 392 +}
 393 +
 394 +// called when the character device is opened
 395 +static int set_use_inc(void *data)
 396 +{
 397 +       int result;
 398 +       unsigned long flags;
 399 +
 400 +       /* initialize timestamp */
 401 +       do_gettimeofday(&lasttv);
 402 +
 403 +       result = request_irq(gpiochip->to_irq(gpiochip, gpio_in_pin),
 404 +                            (irq_handler_t) irq_handler, 0,
 405 +                            LIRC_DRIVER_NAME, (void*) 0);
 406 +
 407 +       switch (result) {
 408 +       case -EBUSY:
 409 +               printk(KERN_ERR LIRC_DRIVER_NAME
 410 +                      ": IRQ %d is busy\n",
 411 +                      gpiochip->to_irq(gpiochip, gpio_in_pin));
 412 +               return -EBUSY;
 413 +       case -EINVAL:
 414 +               printk(KERN_ERR LIRC_DRIVER_NAME
 415 +                      ": Bad irq number or handler\n");
 416 +               return -EINVAL;
 417 +       default:
 418 +               dprintk("Interrupt %d obtained\n",
 419 +                       gpiochip->to_irq(gpiochip, gpio_in_pin));
 420 +               break;
 421 +       };
 422 +
 423 +       /* initialize pulse/space widths */
 424 +       init_timing_params(duty_cycle, freq);
 425 +
 426 +       spin_lock_irqsave(&lock, flags);
 427 +
 428 +       /* GPIO Pin Falling/Rising Edge Detect Enable */
 429 +       irqchip->irq_set_type(irqdata,
 430 +                             IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING);
 431 +
 432 +       /* unmask the irq */
 433 +       irqchip->irq_unmask(irqdata);
 434 +
 435 +       spin_unlock_irqrestore(&lock, flags);
 436 +
 437 +       return 0;
 438 +}
 439 +
 440 +static void set_use_dec(void *data)
 441 +{
 442 +       unsigned long flags;
 443 +
 444 +       spin_lock_irqsave(&lock, flags);
 445 +
 446 +       /* GPIO Pin Falling/Rising Edge Detect Disable */
 447 +       irqchip->irq_set_type(irqdata, 0);
 448 +       irqchip->irq_mask(irqdata);
 449 +
 450 +       spin_unlock_irqrestore(&lock, flags);
 451 +
 452 +       free_irq(gpiochip->to_irq(gpiochip, gpio_in_pin), (void *) 0);
 453 +
 454 +       dprintk(KERN_INFO LIRC_DRIVER_NAME
 455 +               ": freed IRQ %d\n", gpiochip->to_irq(gpiochip, gpio_in_pin));
 456 +}
 457 +
 458 +static ssize_t lirc_write(struct file *file, const char *buf,
 459 +       size_t n, loff_t *ppos)
 460 +{
 461 +       int i, count;
 462 +       unsigned long flags;
 463 +       long delta = 0;
 464 +       int *wbuf;
 465 +
 466 +       count = n / sizeof(int);
 467 +       if (n % sizeof(int) || count % 2 == 0)
 468 +               return -EINVAL;
 469 +       wbuf = memdup_user(buf, n);
 470 +       if (IS_ERR(wbuf))
 471 +               return PTR_ERR(wbuf);
 472 +       spin_lock_irqsave(&lock, flags);
 473 +
 474 +       for (i = 0; i < count; i++) {
 475 +               if (i%2)
 476 +                       send_space(wbuf[i] - delta);
 477 +               else
 478 +                       delta = send_pulse(wbuf[i]);
 479 +       }
 480 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 481 +
 482 +       spin_unlock_irqrestore(&lock, flags);
 483 +       kfree(wbuf);
 484 +       return n;
 485 +}
 486 +
 487 +static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 488 +{
 489 +       int result;
 490 +       __u32 value;
 491 +
 492 +       switch (cmd) {
 493 +       case LIRC_GET_SEND_MODE:
 494 +               return -ENOIOCTLCMD;
 495 +               break;
 496 +
 497 +       case LIRC_SET_SEND_MODE:
 498 +               result = get_user(value, (__u32 *) arg);
 499 +               if (result)
 500 +                       return result;
 501 +               /* only LIRC_MODE_PULSE supported */
 502 +               if (value != LIRC_MODE_PULSE)
 503 +                       return -ENOSYS;
 504 +               break;
 505 +
 506 +       case LIRC_GET_LENGTH:
 507 +               return -ENOSYS;
 508 +               break;
 509 +
 510 +       case LIRC_SET_SEND_DUTY_CYCLE:
 511 +               dprintk("SET_SEND_DUTY_CYCLE\n");
 512 +               result = get_user(value, (__u32 *) arg);
 513 +               if (result)
 514 +                       return result;
 515 +               if (value <= 0 || value > 100)
 516 +                       return -EINVAL;
 517 +               return init_timing_params(value, freq);
 518 +               break;
 519 +
 520 +       case LIRC_SET_SEND_CARRIER:
 521 +               dprintk("SET_SEND_CARRIER\n");
 522 +               result = get_user(value, (__u32 *) arg);
 523 +               if (result)
 524 +                       return result;
 525 +               if (value > 500000 || value < 20000)
 526 +                       return -EINVAL;
 527 +               return init_timing_params(duty_cycle, value);
 528 +               break;
 529 +
 530 +       default:
 531 +               return lirc_dev_fop_ioctl(filep, cmd, arg);
 532 +       }
 533 +       return 0;
 534 +}
 535 +
 536 +static const struct file_operations lirc_fops = {
 537 +       .owner          = THIS_MODULE,
 538 +       .write          = lirc_write,
 539 +       .unlocked_ioctl = lirc_ioctl,
 540 +       .read           = lirc_dev_fop_read,
 541 +       .poll           = lirc_dev_fop_poll,
 542 +       .open           = lirc_dev_fop_open,
 543 +       .release        = lirc_dev_fop_close,
 544 +       .llseek         = no_llseek,
 545 +};
 546 +
 547 +static struct lirc_driver driver = {
 548 +       .name           = LIRC_DRIVER_NAME,
 549 +       .minor          = -1,
 550 +       .code_length    = 1,
 551 +       .sample_rate    = 0,
 552 +       .data           = NULL,
 553 +       .add_to_buf     = NULL,
 554 +       .rbuf           = &rbuf,
 555 +       .set_use_inc    = set_use_inc,
 556 +       .set_use_dec    = set_use_dec,
 557 +       .fops           = &lirc_fops,
 558 +       .dev            = NULL,
 559 +       .owner          = THIS_MODULE,
 560 +};
 561 +
 562 +static struct platform_driver lirc_rpi_driver = {
 563 +       .driver = {
 564 +               .name   = LIRC_DRIVER_NAME,
 565 +               .owner  = THIS_MODULE,
 566 +       },
 567 +};
 568 +
 569 +static int __init lirc_rpi_init(void)
 570 +{
 571 +       int result;
 572 +
 573 +       /* Init read buffer. */
 574 +       result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
 575 +       if (result < 0)
 576 +               return -ENOMEM;
 577 +
 578 +       result = platform_driver_register(&lirc_rpi_driver);
 579 +       if (result) {
 580 +               printk(KERN_ERR LIRC_DRIVER_NAME
 581 +                      ": lirc register returned %d\n", result);
 582 +               goto exit_buffer_free;
 583 +       }
 584 +
 585 +       lirc_rpi_dev = platform_device_alloc(LIRC_DRIVER_NAME, 0);
 586 +       if (!lirc_rpi_dev) {
 587 +               result = -ENOMEM;
 588 +               goto exit_driver_unregister;
 589 +       }
 590 +
 591 +       result = platform_device_add(lirc_rpi_dev);
 592 +       if (result)
 593 +               goto exit_device_put;
 594 +
 595 +       return 0;
 596 +
 597 +       exit_device_put:
 598 +       platform_device_put(lirc_rpi_dev);
 599 +
 600 +       exit_driver_unregister:
 601 +       platform_driver_unregister(&lirc_rpi_driver);
 602 +
 603 +       exit_buffer_free:
 604 +       lirc_buffer_free(&rbuf);
 605 +
 606 +       return result;
 607 +}
 608 +
 609 +static void lirc_rpi_exit(void)
 610 +{
 611 +       gpio_free(gpio_out_pin);
 612 +       gpio_free(gpio_in_pin);
 613 +       platform_device_unregister(lirc_rpi_dev);
 614 +       platform_driver_unregister(&lirc_rpi_driver);
 615 +       lirc_buffer_free(&rbuf);
 616 +}
 617 +
 618 +static int __init lirc_rpi_init_module(void)
 619 +{
 620 +       int result, i;
 621 +
 622 +       result = lirc_rpi_init();
 623 +       if (result)
 624 +               return result;
 625 +
 626 +       /* check if the module received valid gpio pin numbers */
 627 +       result = 0;
 628 +       if (gpio_in_pin != gpio_out_pin) {
 629 +               for(i = 0; (i < ARRAY_SIZE(valid_gpio_pins)) && (result != 2); i++) {
 630 +                       if (gpio_in_pin == valid_gpio_pins[i] ||
 631 +                          gpio_out_pin == valid_gpio_pins[i]) {
 632 +                               result++;
 633 +                       }
 634 +               }
 635 +       }
 636 +
 637 +       if (result != 2) {
 638 +               result = -EINVAL;
 639 +               printk(KERN_ERR LIRC_DRIVER_NAME
 640 +                      ": invalid GPIO pin(s) specified!\n");
 641 +               goto exit_rpi;
 642 +       }
 643 +
 644 +       driver.features = LIRC_CAN_SET_SEND_DUTY_CYCLE |
 645 +                         LIRC_CAN_SET_SEND_CARRIER |
 646 +                         LIRC_CAN_SEND_PULSE |
 647 +                         LIRC_CAN_REC_MODE2;
 648 +
 649 +       driver.dev = &lirc_rpi_dev->dev;
 650 +       driver.minor = lirc_register_driver(&driver);
 651 +
 652 +       if (driver.minor < 0) {
 653 +               printk(KERN_ERR LIRC_DRIVER_NAME
 654 +                      ": device registration failed with %d\n", result);
 655 +               result = -EIO;
 656 +               goto exit_rpi;
 657 +       }
 658 +
 659 +       printk(KERN_INFO LIRC_DRIVER_NAME ": driver registered!\n");
 660 +
 661 +       result = init_port();
 662 +       if (result < 0)
 663 +               goto exit_rpi;
 664 +
 665 +       return 0;
 666 +
 667 +       exit_rpi:
 668 +       lirc_rpi_exit();
 669 +
 670 +       return result;
 671 +}
 672 +
 673 +static void __exit lirc_rpi_exit_module(void)
 674 +{
 675 +       lirc_rpi_exit();
 676 +
 677 +       lirc_unregister_driver(driver.minor);
 678 +       printk(KERN_INFO LIRC_DRIVER_NAME ": cleaned up module\n");
 679 +}
 680 +
 681 +module_init(lirc_rpi_init_module);
 682 +module_exit(lirc_rpi_exit_module);
 683 +
 684 +MODULE_DESCRIPTION("Infra-red receiver and blaster driver for Raspberry Pi GPIO.");
 685 +MODULE_AUTHOR("Aron Robert Szabo <aron@reon.hu>");
 686 +MODULE_AUTHOR("Michael Bishop <cleverca22@gmail.com>");
 687 +MODULE_LICENSE("GPL");
 688 +
 689 +module_param(gpio_out_pin, int, S_IRUGO);
 690 +MODULE_PARM_DESC(gpio_out_pin, "GPIO output/transmitter pin number of the BCM"
 691 +                " processor. Valid pin numbers are: 0, 1, 4, 8, 7, 9, 10, 11,"
 692 +                " 14, 15, 17, 18, 21, 22, 23, 24, 25, default 17");
 693 +
 694 +module_param(gpio_in_pin, int, S_IRUGO);
 695 +MODULE_PARM_DESC(gpio_in_pin, "GPIO input pin number of the BCM processor."
 696 +                " Valid pin numbers are: 0, 1, 4, 8, 7, 9, 10, 11, 14, 15,"
 697 +                " 17, 18, 21, 22, 23, 24, 25, default 18");
 698 +
 699 +module_param(sense, bool, S_IRUGO);
 700 +MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
 701 +                " (0 = active high, 1 = active low )");
 702 +
 703 +module_param(softcarrier, bool, S_IRUGO);
 704 +MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
 705 +
 706 +module_param(invert, bool, S_IRUGO);
 707 +MODULE_PARM_DESC(invert, "Invert output (0 = off, 1 = on, default off");
 708 +
 709 +module_param(debug, bool, S_IRUGO | S_IWUSR);
 710 +MODULE_PARM_DESC(debug, "Enable debugging messages");
 711 --- a/drivers/staging/media/lirc/Makefile
 712 +++ b/drivers/staging/media/lirc/Makefile
 713 @@ -7,6 +7,7 @@ obj-$(CONFIG_LIRC_BT829)        += lirc_bt829.o
 714  obj-$(CONFIG_LIRC_IGORPLUGUSB) += lirc_igorplugusb.o
 715  obj-$(CONFIG_LIRC_IMON)                += lirc_imon.o
 716  obj-$(CONFIG_LIRC_PARALLEL)    += lirc_parallel.o
 717 +obj-$(CONFIG_LIRC_RPI)         += lirc_rpi.o
 718  obj-$(CONFIG_LIRC_SASEM)       += lirc_sasem.o
 719  obj-$(CONFIG_LIRC_SERIAL)      += lirc_serial.o
 720  obj-$(CONFIG_LIRC_SIR)         += lirc_sir.o