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

   1 diff -urN linux-3.10/drivers/staging/media/lirc/Kconfig linux-rpi-3.10.y/drivers/staging/media/lirc/Kconfig
   2 --- linux-3.10/drivers/staging/media/lirc/Kconfig       2013-06-30 23:13:29.000000000 +0100
   3 +++ linux-rpi-3.10.y/drivers/staging/media/lirc/Kconfig 2013-07-06 15:25:50.000000000 +0100
   4 @@ -38,6 +38,12 @@
   5         help
   6           Driver for Homebrew Parallel Port Receivers
   7
   8 +config LIRC_RPI
   9 +       tristate "Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi"
  10 +       depends on LIRC
  11 +       help
  12 +         Driver for Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi
  13 +
  14  config LIRC_SASEM
  15         tristate "Sasem USB IR Remote"
  16         depends on LIRC && USB
  17 diff -urN linux-3.10/drivers/staging/media/lirc/lirc_rpi.c linux-rpi-3.10.y/drivers/staging/media/lirc/lirc_rpi.c
  18 --- linux-3.10/drivers/staging/media/lirc/lirc_rpi.c    1970-01-01 01:00:00.000000000 +0100
  19 +++ linux-rpi-3.10.y/drivers/staging/media/lirc/lirc_rpi.c      2013-07-06 15:25:50.000000000 +0100
  20 @@ -0,0 +1,692 @@
  21 +/*
  22 + * lirc_rpi.c
  23 + *
  24 + * lirc_rpi - Device driver that records pulse- and pause-lengths
  25 + *           (space-lengths) (just like the lirc_serial driver does)
  26 + *           between GPIO interrupt events on the Raspberry Pi.
  27 + *           Lots of code has been taken from the lirc_serial module,
  28 + *           so I would like say thanks to the authors.
  29 + *
  30 + * Copyright (C) 2012 Aron Robert Szabo <aron@reon.hu>,
  31 + *                   Michael Bishop <cleverca22@gmail.com>
  32 + *  This program is free software; you can redistribute it and/or modify
  33 + *  it under the terms of the GNU General Public License as published by
  34 + *  the Free Software Foundation; either version 2 of the License, or
  35 + *  (at your option) any later version.
  36 + *
  37 + *  This program is distributed in the hope that it will be useful,
  38 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  39 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  40 + *  GNU General Public License for more details.
  41 + *
  42 + *  You should have received a copy of the GNU General Public License
  43 + *  along with this program; if not, write to the Free Software
  44 + *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  45 + */
  46 +
  47 +#include <linux/module.h>
  48 +#include <linux/errno.h>
  49 +#include <linux/interrupt.h>
  50 +#include <linux/sched.h>
  51 +#include <linux/kernel.h>
  52 +#include <linux/time.h>
  53 +#include <linux/string.h>
  54 +#include <linux/delay.h>
  55 +#include <linux/platform_device.h>
  56 +#include <linux/irq.h>
  57 +#include <linux/spinlock.h>
  58 +#include <media/lirc.h>
  59 +#include <media/lirc_dev.h>
  60 +#include <linux/gpio.h>
  61 +
  62 +#define LIRC_DRIVER_NAME "lirc_rpi"
  63 +#define RBUF_LEN 256
  64 +#define LIRC_TRANSMITTER_LATENCY 256
  65 +
  66 +#ifndef MAX_UDELAY_MS
  67 +#define MAX_UDELAY_US 5000
  68 +#else
  69 +#define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
  70 +#endif
  71 +
  72 +#define dprintk(fmt, args...)                                  \
  73 +       do {                                                    \
  74 +               if (debug)                                      \
  75 +                       printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
  76 +                              fmt, ## args);                   \
  77 +       } while (0)
  78 +
  79 +/* module parameters */
  80 +
  81 +/* set the default GPIO input pin */
  82 +static int gpio_in_pin = 18;
  83 +/* set the default GPIO output pin */
  84 +static int gpio_out_pin = 17;
  85 +/* enable debugging messages */
  86 +static int debug;
  87 +/* -1 = auto, 0 = active high, 1 = active low */
  88 +static int sense = -1;
  89 +/* use softcarrier by default */
  90 +static int softcarrier = 1;
  91 +/* 0 = do not invert output, 1 = invert output */
  92 +static int invert = 0;
  93 +
  94 +struct gpio_chip *gpiochip;
  95 +struct irq_chip *irqchip;
  96 +struct irq_data *irqdata;
  97 +
  98 +/* forward declarations */
  99 +static long send_pulse(unsigned long length);
 100 +static void send_space(long length);
 101 +static void lirc_rpi_exit(void);
 102 +
 103 +int valid_gpio_pins[] = { 0, 1, 4, 8, 7, 9, 10, 11, 14, 15, 17, 18, 21, 22, 23,
 104 +       24, 25 };
 105 +
 106 +static struct platform_device *lirc_rpi_dev;
 107 +static struct timeval lasttv = { 0, 0 };
 108 +static struct lirc_buffer rbuf;
 109 +static spinlock_t lock;
 110 +
 111 +/* initialized/set in init_timing_params() */
 112 +static unsigned int freq = 38000;
 113 +static unsigned int duty_cycle = 50;
 114 +static unsigned long period;
 115 +static unsigned long pulse_width;
 116 +static unsigned long space_width;
 117 +
 118 +static void safe_udelay(unsigned long usecs)
 119 +{
 120 +       while (usecs > MAX_UDELAY_US) {
 121 +               udelay(MAX_UDELAY_US);
 122 +               usecs -= MAX_UDELAY_US;
 123 +       }
 124 +       udelay(usecs);
 125 +}
 126 +
 127 +static int init_timing_params(unsigned int new_duty_cycle,
 128 +       unsigned int new_freq)
 129 +{
 130 +       /*
 131 +        * period, pulse/space width are kept with 8 binary places -
 132 +        * IE multiplied by 256.
 133 +        */
 134 +       if (256 * 1000000L / new_freq * new_duty_cycle / 100 <=
 135 +           LIRC_TRANSMITTER_LATENCY)
 136 +               return -EINVAL;
 137 +       if (256 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
 138 +           LIRC_TRANSMITTER_LATENCY)
 139 +               return -EINVAL;
 140 +       duty_cycle = new_duty_cycle;
 141 +       freq = new_freq;
 142 +       period = 256 * 1000000L / freq;
 143 +       pulse_width = period * duty_cycle / 100;
 144 +       space_width = period - pulse_width;
 145 +       dprintk("in init_timing_params, freq=%d pulse=%ld, "
 146 +               "space=%ld\n", freq, pulse_width, space_width);
 147 +       return 0;
 148 +}
 149 +
 150 +static long send_pulse_softcarrier(unsigned long length)
 151 +{
 152 +       int flag;
 153 +       unsigned long actual, target, d;
 154 +
 155 +       length <<= 8;
 156 +
 157 +       actual = 0; target = 0; flag = 0;
 158 +       while (actual < length) {
 159 +               if (flag) {
 160 +                       gpiochip->set(gpiochip, gpio_out_pin, invert);
 161 +                       target += space_width;
 162 +               } else {
 163 +                       gpiochip->set(gpiochip, gpio_out_pin, !invert);
 164 +                       target += pulse_width;
 165 +               }
 166 +               d = (target - actual -
 167 +                    LIRC_TRANSMITTER_LATENCY + 128) >> 8;
 168 +               /*
 169 +                * Note - we've checked in ioctl that the pulse/space
 170 +                * widths are big enough so that d is > 0
 171 +                */
 172 +               udelay(d);
 173 +               actual += (d << 8) + LIRC_TRANSMITTER_LATENCY;
 174 +               flag = !flag;
 175 +       }
 176 +       return (actual-length) >> 8;
 177 +}
 178 +
 179 +static long send_pulse(unsigned long length)
 180 +{
 181 +       if (length <= 0)
 182 +               return 0;
 183 +
 184 +       if (softcarrier) {
 185 +               return send_pulse_softcarrier(length);
 186 +       } else {
 187 +               gpiochip->set(gpiochip, gpio_out_pin, !invert);
 188 +               safe_udelay(length);
 189 +               return 0;
 190 +       }
 191 +}
 192 +
 193 +static void send_space(long length)
 194 +{
 195 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 196 +       if (length <= 0)
 197 +               return;
 198 +       safe_udelay(length);
 199 +}
 200 +
 201 +static void rbwrite(int l)
 202 +{
 203 +       if (lirc_buffer_full(&rbuf)) {
 204 +               /* no new signals will be accepted */
 205 +               dprintk("Buffer overrun\n");
 206 +               return;
 207 +       }
 208 +       lirc_buffer_write(&rbuf, (void *)&l);
 209 +}
 210 +
 211 +static void frbwrite(int l)
 212 +{
 213 +       /* simple noise filter */
 214 +       static int pulse, space;
 215 +       static unsigned int ptr;
 216 +
 217 +       if (ptr > 0 && (l & PULSE_BIT)) {
 218 +               pulse += l & PULSE_MASK;
 219 +               if (pulse > 250) {
 220 +                       rbwrite(space);
 221 +                       rbwrite(pulse | PULSE_BIT);
 222 +                       ptr = 0;
 223 +                       pulse = 0;
 224 +               }
 225 +               return;
 226 +       }
 227 +       if (!(l & PULSE_BIT)) {
 228 +               if (ptr == 0) {
 229 +                       if (l > 20000) {
 230 +                               space = l;
 231 +                               ptr++;
 232 +                               return;
 233 +                       }
 234 +               } else {
 235 +                       if (l > 20000) {
 236 +                               space += pulse;
 237 +                               if (space > PULSE_MASK)
 238 +                                       space = PULSE_MASK;
 239 +                               space += l;
 240 +                               if (space > PULSE_MASK)
 241 +                                       space = PULSE_MASK;
 242 +                               pulse = 0;
 243 +                               return;
 244 +                       }
 245 +                       rbwrite(space);
 246 +                       rbwrite(pulse | PULSE_BIT);
 247 +                       ptr = 0;
 248 +                       pulse = 0;
 249 +               }
 250 +       }
 251 +       rbwrite(l);
 252 +}
 253 +
 254 +static irqreturn_t irq_handler(int i, void *blah, struct pt_regs *regs)
 255 +{
 256 +       struct timeval tv;
 257 +       long deltv;
 258 +       int data;
 259 +       int signal;
 260 +
 261 +       /* use the GPIO signal level */
 262 +       signal = gpiochip->get(gpiochip, gpio_in_pin);
 263 +
 264 +       /* unmask the irq */
 265 +       irqchip->irq_unmask(irqdata);
 266 +
 267 +       if (sense != -1) {
 268 +               /* get current time */
 269 +               do_gettimeofday(&tv);
 270 +
 271 +               /* calc time since last interrupt in microseconds */
 272 +               deltv = tv.tv_sec-lasttv.tv_sec;
 273 +               if (tv.tv_sec < lasttv.tv_sec ||
 274 +                   (tv.tv_sec == lasttv.tv_sec &&
 275 +                    tv.tv_usec < lasttv.tv_usec)) {
 276 +                       printk(KERN_WARNING LIRC_DRIVER_NAME
 277 +                              ": AIEEEE: your clock just jumped backwards\n");
 278 +                       printk(KERN_WARNING LIRC_DRIVER_NAME
 279 +                              ": %d %d %lx %lx %lx %lx\n", signal, sense,
 280 +                              tv.tv_sec, lasttv.tv_sec,
 281 +                              tv.tv_usec, lasttv.tv_usec);
 282 +                       data = PULSE_MASK;
 283 +               } else if (deltv > 15) {
 284 +                       data = PULSE_MASK; /* really long time */
 285 +                       if (!(signal^sense)) {
 286 +                               /* sanity check */
 287 +                               printk(KERN_WARNING LIRC_DRIVER_NAME
 288 +                                      ": AIEEEE: %d %d %lx %lx %lx %lx\n",
 289 +                                      signal, sense, tv.tv_sec, lasttv.tv_sec,
 290 +                                      tv.tv_usec, lasttv.tv_usec);
 291 +                               /*
 292 +                                * detecting pulse while this
 293 +                                * MUST be a space!
 294 +                                */
 295 +                               sense = sense ? 0 : 1;
 296 +                       }
 297 +               } else {
 298 +                       data = (int) (deltv*1000000 +
 299 +                                     (tv.tv_usec - lasttv.tv_usec));
 300 +               }
 301 +               frbwrite(signal^sense ? data : (data|PULSE_BIT));
 302 +               lasttv = tv;
 303 +               wake_up_interruptible(&rbuf.wait_poll);
 304 +       }
 305 +
 306 +       return IRQ_HANDLED;
 307 +}
 308 +
 309 +static int is_right_chip(struct gpio_chip *chip, void *data)
 310 +{
 311 +       dprintk("is_right_chip %s %d\n", chip->label, strcmp(data, chip->label));
 312 +
 313 +       if (strcmp(data, chip->label) == 0)
 314 +               return 1;
 315 +       return 0;
 316 +}
 317 +
 318 +static int init_port(void)
 319 +{
 320 +       int i, nlow, nhigh, ret, irq;
 321 +
 322 +       gpiochip = gpiochip_find("bcm2708_gpio", is_right_chip);
 323 +
 324 +       if (!gpiochip)
 325 +               return -ENODEV;
 326 +
 327 +       if (gpio_request(gpio_out_pin, LIRC_DRIVER_NAME " ir/out")) {
 328 +               printk(KERN_ALERT LIRC_DRIVER_NAME
 329 +                      ": cant claim gpio pin %d\n", gpio_out_pin);
 330 +               ret = -ENODEV;
 331 +               goto exit_init_port;
 332 +       }
 333 +
 334 +       if (gpio_request(gpio_in_pin, LIRC_DRIVER_NAME " ir/in")) {
 335 +               printk(KERN_ALERT LIRC_DRIVER_NAME
 336 +                      ": cant claim gpio pin %d\n", gpio_in_pin);
 337 +               ret = -ENODEV;
 338 +               goto exit_gpio_free_out_pin;
 339 +       }
 340 +
 341 +       gpiochip->direction_input(gpiochip, gpio_in_pin);
 342 +       gpiochip->direction_output(gpiochip, gpio_out_pin, 1);
 343 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 344 +
 345 +       irq = gpiochip->to_irq(gpiochip, gpio_in_pin);
 346 +       dprintk("to_irq %d\n", irq);
 347 +       irqdata = irq_get_irq_data(irq);
 348 +
 349 +       if (irqdata && irqdata->chip) {
 350 +               irqchip = irqdata->chip;
 351 +       } else {
 352 +               ret = -ENODEV;
 353 +               goto exit_gpio_free_in_pin;
 354 +       }
 355 +
 356 +       /* if pin is high, then this must be an active low receiver. */
 357 +       if (sense == -1) {
 358 +               /* wait 1/2 sec for the power supply */
 359 +               msleep(500);
 360 +
 361 +               /*
 362 +                * probe 9 times every 0.04s, collect "votes" for
 363 +                * active high/low
 364 +                */
 365 +               nlow = 0;
 366 +               nhigh = 0;
 367 +               for (i = 0; i < 9; i++) {
 368 +                       if (gpiochip->get(gpiochip, gpio_in_pin))
 369 +                               nlow++;
 370 +                       else
 371 +                               nhigh++;
 372 +                       msleep(40);
 373 +               }
 374 +               sense = (nlow >= nhigh ? 1 : 0);
 375 +               printk(KERN_INFO LIRC_DRIVER_NAME
 376 +                      ": auto-detected active %s receiver on GPIO pin %d\n",
 377 +                      sense ? "low" : "high", gpio_in_pin);
 378 +       } else {
 379 +               printk(KERN_INFO LIRC_DRIVER_NAME
 380 +                      ": manually using active %s receiver on GPIO pin %d\n",
 381 +                      sense ? "low" : "high", gpio_in_pin);
 382 +       }
 383 +
 384 +       return 0;
 385 +
 386 +       exit_gpio_free_in_pin:
 387 +       gpio_free(gpio_in_pin);
 388 +
 389 +       exit_gpio_free_out_pin:
 390 +       gpio_free(gpio_out_pin);
 391 +
 392 +       exit_init_port:
 393 +       return ret;
 394 +}
 395 +
 396 +// called when the character device is opened
 397 +static int set_use_inc(void *data)
 398 +{
 399 +       int result;
 400 +       unsigned long flags;
 401 +
 402 +       /* initialize timestamp */
 403 +       do_gettimeofday(&lasttv);
 404 +
 405 +       result = request_irq(gpiochip->to_irq(gpiochip, gpio_in_pin),
 406 +                            (irq_handler_t) irq_handler, 0,
 407 +                            LIRC_DRIVER_NAME, (void*) 0);
 408 +
 409 +       switch (result) {
 410 +       case -EBUSY:
 411 +               printk(KERN_ERR LIRC_DRIVER_NAME
 412 +                      ": IRQ %d is busy\n",
 413 +                      gpiochip->to_irq(gpiochip, gpio_in_pin));
 414 +               return -EBUSY;
 415 +       case -EINVAL:
 416 +               printk(KERN_ERR LIRC_DRIVER_NAME
 417 +                      ": Bad irq number or handler\n");
 418 +               return -EINVAL;
 419 +       default:
 420 +               dprintk("Interrupt %d obtained\n",
 421 +                       gpiochip->to_irq(gpiochip, gpio_in_pin));
 422 +               break;
 423 +       };
 424 +
 425 +       /* initialize pulse/space widths */
 426 +       init_timing_params(duty_cycle, freq);
 427 +
 428 +       spin_lock_irqsave(&lock, flags);
 429 +
 430 +       /* GPIO Pin Falling/Rising Edge Detect Enable */
 431 +       irqchip->irq_set_type(irqdata,
 432 +                             IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING);
 433 +
 434 +       /* unmask the irq */
 435 +       irqchip->irq_unmask(irqdata);
 436 +
 437 +       spin_unlock_irqrestore(&lock, flags);
 438 +
 439 +       return 0;
 440 +}
 441 +
 442 +static void set_use_dec(void *data)
 443 +{
 444 +       unsigned long flags;
 445 +
 446 +       spin_lock_irqsave(&lock, flags);
 447 +
 448 +       /* GPIO Pin Falling/Rising Edge Detect Disable */
 449 +       irqchip->irq_set_type(irqdata, 0);
 450 +       irqchip->irq_mask(irqdata);
 451 +
 452 +       spin_unlock_irqrestore(&lock, flags);
 453 +
 454 +       free_irq(gpiochip->to_irq(gpiochip, gpio_in_pin), (void *) 0);
 455 +
 456 +       dprintk(KERN_INFO LIRC_DRIVER_NAME
 457 +               ": freed IRQ %d\n", gpiochip->to_irq(gpiochip, gpio_in_pin));
 458 +}
 459 +
 460 +static ssize_t lirc_write(struct file *file, const char *buf,
 461 +       size_t n, loff_t *ppos)
 462 +{
 463 +       int i, count;
 464 +       unsigned long flags;
 465 +       long delta = 0;
 466 +       int *wbuf;
 467 +
 468 +       count = n / sizeof(int);
 469 +       if (n % sizeof(int) || count % 2 == 0)
 470 +               return -EINVAL;
 471 +       wbuf = memdup_user(buf, n);
 472 +       if (IS_ERR(wbuf))
 473 +               return PTR_ERR(wbuf);
 474 +       spin_lock_irqsave(&lock, flags);
 475 +
 476 +       for (i = 0; i < count; i++) {
 477 +               if (i%2)
 478 +                       send_space(wbuf[i] - delta);
 479 +               else
 480 +                       delta = send_pulse(wbuf[i]);
 481 +       }
 482 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 483 +
 484 +       spin_unlock_irqrestore(&lock, flags);
 485 +       kfree(wbuf);
 486 +       return n;
 487 +}
 488 +
 489 +static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 490 +{
 491 +       int result;
 492 +       __u32 value;
 493 +
 494 +       switch (cmd) {
 495 +       case LIRC_GET_SEND_MODE:
 496 +               return -ENOIOCTLCMD;
 497 +               break;
 498 +
 499 +       case LIRC_SET_SEND_MODE:
 500 +               result = get_user(value, (__u32 *) arg);
 501 +               if (result)
 502 +                       return result;
 503 +               /* only LIRC_MODE_PULSE supported */
 504 +               if (value != LIRC_MODE_PULSE)
 505 +                       return -ENOSYS;
 506 +               break;
 507 +
 508 +       case LIRC_GET_LENGTH:
 509 +               return -ENOSYS;
 510 +               break;
 511 +
 512 +       case LIRC_SET_SEND_DUTY_CYCLE:
 513 +               dprintk("SET_SEND_DUTY_CYCLE\n");
 514 +               result = get_user(value, (__u32 *) arg);
 515 +               if (result)
 516 +                       return result;
 517 +               if (value <= 0 || value > 100)
 518 +                       return -EINVAL;
 519 +               return init_timing_params(value, freq);
 520 +               break;
 521 +
 522 +       case LIRC_SET_SEND_CARRIER:
 523 +               dprintk("SET_SEND_CARRIER\n");
 524 +               result = get_user(value, (__u32 *) arg);
 525 +               if (result)
 526 +                       return result;
 527 +               if (value > 500000 || value < 20000)
 528 +                       return -EINVAL;
 529 +               return init_timing_params(duty_cycle, value);
 530 +               break;
 531 +
 532 +       default:
 533 +               return lirc_dev_fop_ioctl(filep, cmd, arg);
 534 +       }
 535 +       return 0;
 536 +}
 537 +
 538 +static const struct file_operations lirc_fops = {
 539 +       .owner          = THIS_MODULE,
 540 +       .write          = lirc_write,
 541 +       .unlocked_ioctl = lirc_ioctl,
 542 +       .read           = lirc_dev_fop_read,
 543 +       .poll           = lirc_dev_fop_poll,
 544 +       .open           = lirc_dev_fop_open,
 545 +       .release        = lirc_dev_fop_close,
 546 +       .llseek         = no_llseek,
 547 +};
 548 +
 549 +static struct lirc_driver driver = {
 550 +       .name           = LIRC_DRIVER_NAME,
 551 +       .minor          = -1,
 552 +       .code_length    = 1,
 553 +       .sample_rate    = 0,
 554 +       .data           = NULL,
 555 +       .add_to_buf     = NULL,
 556 +       .rbuf           = &rbuf,
 557 +       .set_use_inc    = set_use_inc,
 558 +       .set_use_dec    = set_use_dec,
 559 +       .fops           = &lirc_fops,
 560 +       .dev            = NULL,
 561 +       .owner          = THIS_MODULE,
 562 +};
 563 +
 564 +static struct platform_driver lirc_rpi_driver = {
 565 +       .driver = {
 566 +               .name   = LIRC_DRIVER_NAME,
 567 +               .owner  = THIS_MODULE,
 568 +       },
 569 +};
 570 +
 571 +static int __init lirc_rpi_init(void)
 572 +{
 573 +       int result;
 574 +
 575 +       /* Init read buffer. */
 576 +       result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
 577 +       if (result < 0)
 578 +               return -ENOMEM;
 579 +
 580 +       result = platform_driver_register(&lirc_rpi_driver);
 581 +       if (result) {
 582 +               printk(KERN_ERR LIRC_DRIVER_NAME
 583 +                      ": lirc register returned %d\n", result);
 584 +               goto exit_buffer_free;
 585 +       }
 586 +
 587 +       lirc_rpi_dev = platform_device_alloc(LIRC_DRIVER_NAME, 0);
 588 +       if (!lirc_rpi_dev) {
 589 +               result = -ENOMEM;
 590 +               goto exit_driver_unregister;
 591 +       }
 592 +
 593 +       result = platform_device_add(lirc_rpi_dev);
 594 +       if (result)
 595 +               goto exit_device_put;
 596 +
 597 +       return 0;
 598 +
 599 +       exit_device_put:
 600 +       platform_device_put(lirc_rpi_dev);
 601 +
 602 +       exit_driver_unregister:
 603 +       platform_driver_unregister(&lirc_rpi_driver);
 604 +
 605 +       exit_buffer_free:
 606 +       lirc_buffer_free(&rbuf);
 607 +
 608 +       return result;
 609 +}
 610 +
 611 +static void lirc_rpi_exit(void)
 612 +{
 613 +       gpio_free(gpio_out_pin);
 614 +       gpio_free(gpio_in_pin);
 615 +       platform_device_unregister(lirc_rpi_dev);
 616 +       platform_driver_unregister(&lirc_rpi_driver);
 617 +       lirc_buffer_free(&rbuf);
 618 +}
 619 +
 620 +static int __init lirc_rpi_init_module(void)
 621 +{
 622 +       int result, i;
 623 +
 624 +       result = lirc_rpi_init();
 625 +       if (result)
 626 +               return result;
 627 +
 628 +       /* check if the module received valid gpio pin numbers */
 629 +       result = 0;
 630 +       if (gpio_in_pin != gpio_out_pin) {
 631 +               for(i = 0; (i < ARRAY_SIZE(valid_gpio_pins)) && (result != 2); i++) {
 632 +                       if (gpio_in_pin == valid_gpio_pins[i] ||
 633 +                          gpio_out_pin == valid_gpio_pins[i]) {
 634 +                               result++;
 635 +                       }
 636 +               }
 637 +       }
 638 +
 639 +       if (result != 2) {
 640 +               result = -EINVAL;
 641 +               printk(KERN_ERR LIRC_DRIVER_NAME
 642 +                      ": invalid GPIO pin(s) specified!\n");
 643 +               goto exit_rpi;
 644 +       }
 645 +
 646 +       driver.features = LIRC_CAN_SET_SEND_DUTY_CYCLE |
 647 +                         LIRC_CAN_SET_SEND_CARRIER |
 648 +                         LIRC_CAN_SEND_PULSE |
 649 +                         LIRC_CAN_REC_MODE2;
 650 +
 651 +       driver.dev = &lirc_rpi_dev->dev;
 652 +       driver.minor = lirc_register_driver(&driver);
 653 +
 654 +       if (driver.minor < 0) {
 655 +               printk(KERN_ERR LIRC_DRIVER_NAME
 656 +                      ": device registration failed with %d\n", result);
 657 +               result = -EIO;
 658 +               goto exit_rpi;
 659 +       }
 660 +
 661 +       printk(KERN_INFO LIRC_DRIVER_NAME ": driver registered!\n");
 662 +
 663 +       result = init_port();
 664 +       if (result < 0)
 665 +               goto exit_rpi;
 666 +
 667 +       return 0;
 668 +
 669 +       exit_rpi:
 670 +       lirc_rpi_exit();
 671 +
 672 +       return result;
 673 +}
 674 +
 675 +static void __exit lirc_rpi_exit_module(void)
 676 +{
 677 +       lirc_rpi_exit();
 678 +
 679 +       lirc_unregister_driver(driver.minor);
 680 +       printk(KERN_INFO LIRC_DRIVER_NAME ": cleaned up module\n");
 681 +}
 682 +
 683 +module_init(lirc_rpi_init_module);
 684 +module_exit(lirc_rpi_exit_module);
 685 +
 686 +MODULE_DESCRIPTION("Infra-red receiver and blaster driver for Raspberry Pi GPIO.");
 687 +MODULE_AUTHOR("Aron Robert Szabo <aron@reon.hu>");
 688 +MODULE_AUTHOR("Michael Bishop <cleverca22@gmail.com>");
 689 +MODULE_LICENSE("GPL");
 690 +
 691 +module_param(gpio_out_pin, int, S_IRUGO);
 692 +MODULE_PARM_DESC(gpio_out_pin, "GPIO output/transmitter pin number of the BCM"
 693 +                " processor. Valid pin numbers are: 0, 1, 4, 8, 7, 9, 10, 11,"
 694 +                " 14, 15, 17, 18, 21, 22, 23, 24, 25, default 17");
 695 +
 696 +module_param(gpio_in_pin, int, S_IRUGO);
 697 +MODULE_PARM_DESC(gpio_in_pin, "GPIO input pin number of the BCM processor."
 698 +                " Valid pin numbers are: 0, 1, 4, 8, 7, 9, 10, 11, 14, 15,"
 699 +                " 17, 18, 21, 22, 23, 24, 25, default 18");
 700 +
 701 +module_param(sense, bool, S_IRUGO);
 702 +MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
 703 +                " (0 = active high, 1 = active low )");
 704 +
 705 +module_param(softcarrier, bool, S_IRUGO);
 706 +MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
 707 +
 708 +module_param(invert, bool, S_IRUGO);
 709 +MODULE_PARM_DESC(invert, "Invert output (0 = off, 1 = on, default off");
 710 +
 711 +module_param(debug, bool, S_IRUGO | S_IWUSR);
 712 +MODULE_PARM_DESC(debug, "Enable debugging messages");
 713 diff -urN linux-3.10/drivers/staging/media/lirc/Makefile linux-rpi-3.10.y/drivers/staging/media/lirc/Makefile
 714 --- linux-3.10/drivers/staging/media/lirc/Makefile      2013-06-30 23:13:29.000000000 +0100
 715 +++ linux-rpi-3.10.y/drivers/staging/media/lirc/Makefile        2013-07-06 15:25:50.000000000 +0100
 716 @@ -7,6 +7,7 @@
 717  obj-$(CONFIG_LIRC_IGORPLUGUSB) += lirc_igorplugusb.o
 718  obj-$(CONFIG_LIRC_IMON)                += lirc_imon.o
 719  obj-$(CONFIG_LIRC_PARALLEL)    += lirc_parallel.o
 720 +obj-$(CONFIG_LIRC_RPI)         += lirc_rpi.o
 721  obj-$(CONFIG_LIRC_SASEM)       += lirc_sasem.o
 722  obj-$(CONFIG_LIRC_SERIAL)      += lirc_serial.o
 723  obj-$(CONFIG_LIRC_SIR)         += lirc_sir.o