target/linux/brcm2708/patches-3.14/0012-lirc-added-support-for-RaspberryPi-GPIO.patch

   1 From 04439327ad7c2afd72b6fe8c43c922b892dff7c3 Mon Sep 17 00:00:00 2001
   2 From: Aron Szabo <aron@aron.ws>
   3 Date: Sat, 16 Jun 2012 12:15:55 +0200
   4 Subject: [PATCH 12/54] lirc: added support for RaspberryPi GPIO
   5
   6 lirc_rpi: Use read_current_timer to determine transmitter delay. Thanks to jjmz and others
   7 See: https://github.com/raspberrypi/linux/issues/525
   8 ---
   9  drivers/staging/media/lirc/Kconfig    |   6 +
  10  drivers/staging/media/lirc/Makefile   |   1 +
  11  drivers/staging/media/lirc/lirc_rpi.c | 695 ++++++++++++++++++++++++++++++++++
  12  3 files changed, 702 insertions(+)
  13  create mode 100644 drivers/staging/media/lirc/lirc_rpi.c
  14
  15 diff --git a/drivers/staging/media/lirc/Kconfig b/drivers/staging/media/lirc/Kconfig
  16 index e60a59f..6b7ff70 100644
  17 --- a/drivers/staging/media/lirc/Kconfig
  18 +++ b/drivers/staging/media/lirc/Kconfig
  19 @@ -38,6 +38,12 @@ config LIRC_PARALLEL
  20         help
  21           Driver for Homebrew Parallel Port Receivers
  22
  23 +config LIRC_RPI
  24 +       tristate "Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi"
  25 +       depends on LIRC
  26 +       help
  27 +         Driver for Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi
  28 +
  29  config LIRC_SASEM
  30         tristate "Sasem USB IR Remote"
  31         depends on LIRC && USB
  32 diff --git a/drivers/staging/media/lirc/Makefile b/drivers/staging/media/lirc/Makefile
  33 index b90fcab..2b227fd 100644
  34 --- a/drivers/staging/media/lirc/Makefile
  35 +++ b/drivers/staging/media/lirc/Makefile
  36 @@ -7,6 +7,7 @@ obj-$(CONFIG_LIRC_BT829)        += lirc_bt829.o
  37  obj-$(CONFIG_LIRC_IGORPLUGUSB) += lirc_igorplugusb.o
  38  obj-$(CONFIG_LIRC_IMON)                += lirc_imon.o
  39  obj-$(CONFIG_LIRC_PARALLEL)    += lirc_parallel.o
  40 +obj-$(CONFIG_LIRC_RPI)         += lirc_rpi.o
  41  obj-$(CONFIG_LIRC_SASEM)       += lirc_sasem.o
  42  obj-$(CONFIG_LIRC_SERIAL)      += lirc_serial.o
  43  obj-$(CONFIG_LIRC_SIR)         += lirc_sir.o
  44 diff --git a/drivers/staging/media/lirc/lirc_rpi.c b/drivers/staging/media/lirc/lirc_rpi.c
  45 new file mode 100644
  46 index 0000000..57ffacf
  47 --- /dev/null
  48 +++ b/drivers/staging/media/lirc/lirc_rpi.c
  49 @@ -0,0 +1,695 @@
  50 +/*
  51 + * lirc_rpi.c
  52 + *
  53 + * lirc_rpi - Device driver that records pulse- and pause-lengths
  54 + *           (space-lengths) (just like the lirc_serial driver does)
  55 + *           between GPIO interrupt events on the Raspberry Pi.
  56 + *           Lots of code has been taken from the lirc_serial module,
  57 + *           so I would like say thanks to the authors.
  58 + *
  59 + * Copyright (C) 2012 Aron Robert Szabo <aron@reon.hu>,
  60 + *                   Michael Bishop <cleverca22@gmail.com>
  61 + *  This program is free software; you can redistribute it and/or modify
  62 + *  it under the terms of the GNU General Public License as published by
  63 + *  the Free Software Foundation; either version 2 of the License, or
  64 + *  (at your option) any later version.
  65 + *
  66 + *  This program is distributed in the hope that it will be useful,
  67 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  68 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  69 + *  GNU General Public License for more details.
  70 + *
  71 + *  You should have received a copy of the GNU General Public License
  72 + *  along with this program; if not, write to the Free Software
  73 + *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  74 + */
  75 +
  76 +#include <linux/module.h>
  77 +#include <linux/errno.h>
  78 +#include <linux/interrupt.h>
  79 +#include <linux/sched.h>
  80 +#include <linux/kernel.h>
  81 +#include <linux/time.h>
  82 +#include <linux/timex.h>
  83 +#include <linux/string.h>
  84 +#include <linux/delay.h>
  85 +#include <linux/platform_device.h>
  86 +#include <linux/irq.h>
  87 +#include <linux/spinlock.h>
  88 +#include <media/lirc.h>
  89 +#include <media/lirc_dev.h>
  90 +#include <linux/gpio.h>
  91 +
  92 +#define LIRC_DRIVER_NAME "lirc_rpi"
  93 +#define RBUF_LEN 256
  94 +#define LIRC_TRANSMITTER_LATENCY 50
  95 +
  96 +#ifndef MAX_UDELAY_MS
  97 +#define MAX_UDELAY_US 5000
  98 +#else
  99 +#define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
 100 +#endif
 101 +
 102 +#define dprintk(fmt, args...)                                  \
 103 +       do {                                                    \
 104 +               if (debug)                                      \
 105 +                       printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
 106 +                              fmt, ## args);                   \
 107 +       } while (0)
 108 +
 109 +/* module parameters */
 110 +
 111 +/* set the default GPIO input pin */
 112 +static int gpio_in_pin = 18;
 113 +/* set the default GPIO output pin */
 114 +static int gpio_out_pin = 17;
 115 +/* enable debugging messages */
 116 +static bool debug;
 117 +/* -1 = auto, 0 = active high, 1 = active low */
 118 +static int sense = -1;
 119 +/* use softcarrier by default */
 120 +static bool softcarrier = 1;
 121 +/* 0 = do not invert output, 1 = invert output */
 122 +static bool invert = 0;
 123 +
 124 +struct gpio_chip *gpiochip;
 125 +struct irq_chip *irqchip;
 126 +struct irq_data *irqdata;
 127 +
 128 +/* forward declarations */
 129 +static long send_pulse(unsigned long length);
 130 +static void send_space(long length);
 131 +static void lirc_rpi_exit(void);
 132 +
 133 +int valid_gpio_pins[] = { 0, 1, 2, 3, 4, 7, 8, 9, 10, 11, 14, 15, 17, 18, 21,
 134 +       22, 23, 24, 25 ,27, 28, 29, 30, 31 };
 135 +
 136 +static struct platform_device *lirc_rpi_dev;
 137 +static struct timeval lasttv = { 0, 0 };
 138 +static struct lirc_buffer rbuf;
 139 +static spinlock_t lock;
 140 +
 141 +/* initialized/set in init_timing_params() */
 142 +static unsigned int freq = 38000;
 143 +static unsigned int duty_cycle = 50;
 144 +static unsigned long period;
 145 +static unsigned long pulse_width;
 146 +static unsigned long space_width;
 147 +
 148 +static void safe_udelay(unsigned long usecs)
 149 +{
 150 +       while (usecs > MAX_UDELAY_US) {
 151 +               udelay(MAX_UDELAY_US);
 152 +               usecs -= MAX_UDELAY_US;
 153 +       }
 154 +       udelay(usecs);
 155 +}
 156 +
 157 +static int init_timing_params(unsigned int new_duty_cycle,
 158 +       unsigned int new_freq)
 159 +{
 160 +       if (1000 * 1000000L / new_freq * new_duty_cycle / 100 <=
 161 +           LIRC_TRANSMITTER_LATENCY)
 162 +               return -EINVAL;
 163 +       if (1000 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
 164 +           LIRC_TRANSMITTER_LATENCY)
 165 +               return -EINVAL;
 166 +       duty_cycle = new_duty_cycle;
 167 +       freq = new_freq;
 168 +       period = 1000 * 1000000L / freq;
 169 +       pulse_width = period * duty_cycle / 100;
 170 +       space_width = period - pulse_width;
 171 +       dprintk("in init_timing_params, freq=%d pulse=%ld, "
 172 +               "space=%ld\n", freq, pulse_width, space_width);
 173 +       return 0;
 174 +}
 175 +
 176 +static long send_pulse_softcarrier(unsigned long length)
 177 +{
 178 +       int flag;
 179 +       unsigned long actual, target;
 180 +       unsigned long actual_us, initial_us, target_us;
 181 +
 182 +       length *= 1000;
 183 +
 184 +       actual = 0; target = 0; flag = 0;
 185 +       read_current_timer(&actual_us);
 186 +
 187 +       while (actual < length) {
 188 +               if (flag) {
 189 +                       gpiochip->set(gpiochip, gpio_out_pin, invert);
 190 +                       target += space_width;
 191 +               } else {
 192 +                       gpiochip->set(gpiochip, gpio_out_pin, !invert);
 193 +                       target += pulse_width;
 194 +               }
 195 +               initial_us = actual_us;
 196 +               target_us = actual_us + (target - actual) / 1000;
 197 +               /*
 198 +                * Note - we've checked in ioctl that the pulse/space
 199 +                * widths are big enough so that d is > 0
 200 +                */
 201 +               if  ((int)(target_us - actual_us) > 0)
 202 +                       udelay(target_us - actual_us);
 203 +               read_current_timer(&actual_us);
 204 +               actual += (actual_us - initial_us) * 1000;
 205 +               flag = !flag;
 206 +       }
 207 +       return (actual-length) / 1000;
 208 +}
 209 +
 210 +static long send_pulse(unsigned long length)
 211 +{
 212 +       if (length <= 0)
 213 +               return 0;
 214 +
 215 +       if (softcarrier) {
 216 +               return send_pulse_softcarrier(length);
 217 +       } else {
 218 +               gpiochip->set(gpiochip, gpio_out_pin, !invert);
 219 +               safe_udelay(length);
 220 +               return 0;
 221 +       }
 222 +}
 223 +
 224 +static void send_space(long length)
 225 +{
 226 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 227 +       if (length <= 0)
 228 +               return;
 229 +       safe_udelay(length);
 230 +}
 231 +
 232 +static void rbwrite(int l)
 233 +{
 234 +       if (lirc_buffer_full(&rbuf)) {
 235 +               /* no new signals will be accepted */
 236 +               dprintk("Buffer overrun\n");
 237 +               return;
 238 +       }
 239 +       lirc_buffer_write(&rbuf, (void *)&l);
 240 +}
 241 +
 242 +static void frbwrite(int l)
 243 +{
 244 +       /* simple noise filter */
 245 +       static int pulse, space;
 246 +       static unsigned int ptr;
 247 +
 248 +       if (ptr > 0 && (l & PULSE_BIT)) {
 249 +               pulse += l & PULSE_MASK;
 250 +               if (pulse > 250) {
 251 +                       rbwrite(space);
 252 +                       rbwrite(pulse | PULSE_BIT);
 253 +                       ptr = 0;
 254 +                       pulse = 0;
 255 +               }
 256 +               return;
 257 +       }
 258 +       if (!(l & PULSE_BIT)) {
 259 +               if (ptr == 0) {
 260 +                       if (l > 20000) {
 261 +                               space = l;
 262 +                               ptr++;
 263 +                               return;
 264 +                       }
 265 +               } else {
 266 +                       if (l > 20000) {
 267 +                               space += pulse;
 268 +                               if (space > PULSE_MASK)
 269 +                                       space = PULSE_MASK;
 270 +                               space += l;
 271 +                               if (space > PULSE_MASK)
 272 +                                       space = PULSE_MASK;
 273 +                               pulse = 0;
 274 +                               return;
 275 +                       }
 276 +                       rbwrite(space);
 277 +                       rbwrite(pulse | PULSE_BIT);
 278 +                       ptr = 0;
 279 +                       pulse = 0;
 280 +               }
 281 +       }
 282 +       rbwrite(l);
 283 +}
 284 +
 285 +static irqreturn_t irq_handler(int i, void *blah, struct pt_regs *regs)
 286 +{
 287 +       struct timeval tv;
 288 +       long deltv;
 289 +       int data;
 290 +       int signal;
 291 +
 292 +       /* use the GPIO signal level */
 293 +       signal = gpiochip->get(gpiochip, gpio_in_pin);
 294 +
 295 +       /* unmask the irq */
 296 +       irqchip->irq_unmask(irqdata);
 297 +
 298 +       if (sense != -1) {
 299 +               /* get current time */
 300 +               do_gettimeofday(&tv);
 301 +
 302 +               /* calc time since last interrupt in microseconds */
 303 +               deltv = tv.tv_sec-lasttv.tv_sec;
 304 +               if (tv.tv_sec < lasttv.tv_sec ||
 305 +                   (tv.tv_sec == lasttv.tv_sec &&
 306 +                    tv.tv_usec < lasttv.tv_usec)) {
 307 +                       printk(KERN_WARNING LIRC_DRIVER_NAME
 308 +                              ": AIEEEE: your clock just jumped backwards\n");
 309 +                       printk(KERN_WARNING LIRC_DRIVER_NAME
 310 +                              ": %d %d %lx %lx %lx %lx\n", signal, sense,
 311 +                              tv.tv_sec, lasttv.tv_sec,
 312 +                              tv.tv_usec, lasttv.tv_usec);
 313 +                       data = PULSE_MASK;
 314 +               } else if (deltv > 15) {
 315 +                       data = PULSE_MASK; /* really long time */
 316 +                       if (!(signal^sense)) {
 317 +                               /* sanity check */
 318 +                               printk(KERN_WARNING LIRC_DRIVER_NAME
 319 +                                      ": AIEEEE: %d %d %lx %lx %lx %lx\n",
 320 +                                      signal, sense, tv.tv_sec, lasttv.tv_sec,
 321 +                                      tv.tv_usec, lasttv.tv_usec);
 322 +                               /*
 323 +                                * detecting pulse while this
 324 +                                * MUST be a space!
 325 +                                */
 326 +                               sense = sense ? 0 : 1;
 327 +                       }
 328 +               } else {
 329 +                       data = (int) (deltv*1000000 +
 330 +                                     (tv.tv_usec - lasttv.tv_usec));
 331 +               }
 332 +               frbwrite(signal^sense ? data : (data|PULSE_BIT));
 333 +               lasttv = tv;
 334 +               wake_up_interruptible(&rbuf.wait_poll);
 335 +       }
 336 +
 337 +       return IRQ_HANDLED;
 338 +}
 339 +
 340 +static int is_right_chip(struct gpio_chip *chip, void *data)
 341 +{
 342 +       dprintk("is_right_chip %s %d\n", chip->label, strcmp(data, chip->label));
 343 +
 344 +       if (strcmp(data, chip->label) == 0)
 345 +               return 1;
 346 +       return 0;
 347 +}
 348 +
 349 +static int init_port(void)
 350 +{
 351 +       int i, nlow, nhigh, ret, irq;
 352 +
 353 +       gpiochip = gpiochip_find("bcm2708_gpio", is_right_chip);
 354 +
 355 +       if (!gpiochip)
 356 +               return -ENODEV;
 357 +
 358 +       if (gpio_request(gpio_out_pin, LIRC_DRIVER_NAME " ir/out")) {
 359 +               printk(KERN_ALERT LIRC_DRIVER_NAME
 360 +                      ": cant claim gpio pin %d\n", gpio_out_pin);
 361 +               ret = -ENODEV;
 362 +               goto exit_init_port;
 363 +       }
 364 +
 365 +       if (gpio_request(gpio_in_pin, LIRC_DRIVER_NAME " ir/in")) {
 366 +               printk(KERN_ALERT LIRC_DRIVER_NAME
 367 +                      ": cant claim gpio pin %d\n", gpio_in_pin);
 368 +               ret = -ENODEV;
 369 +               goto exit_gpio_free_out_pin;
 370 +       }
 371 +
 372 +       gpiochip->direction_input(gpiochip, gpio_in_pin);
 373 +       gpiochip->direction_output(gpiochip, gpio_out_pin, 1);
 374 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 375 +
 376 +       irq = gpiochip->to_irq(gpiochip, gpio_in_pin);
 377 +       dprintk("to_irq %d\n", irq);
 378 +       irqdata = irq_get_irq_data(irq);
 379 +
 380 +       if (irqdata && irqdata->chip) {
 381 +               irqchip = irqdata->chip;
 382 +       } else {
 383 +               ret = -ENODEV;
 384 +               goto exit_gpio_free_in_pin;
 385 +       }
 386 +
 387 +       /* if pin is high, then this must be an active low receiver. */
 388 +       if (sense == -1) {
 389 +               /* wait 1/2 sec for the power supply */
 390 +               msleep(500);
 391 +
 392 +               /*
 393 +                * probe 9 times every 0.04s, collect "votes" for
 394 +                * active high/low
 395 +                */
 396 +               nlow = 0;
 397 +               nhigh = 0;
 398 +               for (i = 0; i < 9; i++) {
 399 +                       if (gpiochip->get(gpiochip, gpio_in_pin))
 400 +                               nlow++;
 401 +                       else
 402 +                               nhigh++;
 403 +                       msleep(40);
 404 +               }
 405 +               sense = (nlow >= nhigh ? 1 : 0);
 406 +               printk(KERN_INFO LIRC_DRIVER_NAME
 407 +                      ": auto-detected active %s receiver on GPIO pin %d\n",
 408 +                      sense ? "low" : "high", gpio_in_pin);
 409 +       } else {
 410 +               printk(KERN_INFO LIRC_DRIVER_NAME
 411 +                      ": manually using active %s receiver on GPIO pin %d\n",
 412 +                      sense ? "low" : "high", gpio_in_pin);
 413 +       }
 414 +
 415 +       return 0;
 416 +
 417 +       exit_gpio_free_in_pin:
 418 +       gpio_free(gpio_in_pin);
 419 +
 420 +       exit_gpio_free_out_pin:
 421 +       gpio_free(gpio_out_pin);
 422 +
 423 +       exit_init_port:
 424 +       return ret;
 425 +}
 426 +
 427 +// called when the character device is opened
 428 +static int set_use_inc(void *data)
 429 +{
 430 +       int result;
 431 +       unsigned long flags;
 432 +
 433 +       /* initialize timestamp */
 434 +       do_gettimeofday(&lasttv);
 435 +
 436 +       result = request_irq(gpiochip->to_irq(gpiochip, gpio_in_pin),
 437 +                            (irq_handler_t) irq_handler, 0,
 438 +                            LIRC_DRIVER_NAME, (void*) 0);
 439 +
 440 +       switch (result) {
 441 +       case -EBUSY:
 442 +               printk(KERN_ERR LIRC_DRIVER_NAME
 443 +                      ": IRQ %d is busy\n",
 444 +                      gpiochip->to_irq(gpiochip, gpio_in_pin));
 445 +               return -EBUSY;
 446 +       case -EINVAL:
 447 +               printk(KERN_ERR LIRC_DRIVER_NAME
 448 +                      ": Bad irq number or handler\n");
 449 +               return -EINVAL;
 450 +       default:
 451 +               dprintk("Interrupt %d obtained\n",
 452 +                       gpiochip->to_irq(gpiochip, gpio_in_pin));
 453 +               break;
 454 +       };
 455 +
 456 +       /* initialize pulse/space widths */
 457 +       init_timing_params(duty_cycle, freq);
 458 +
 459 +       spin_lock_irqsave(&lock, flags);
 460 +
 461 +       /* GPIO Pin Falling/Rising Edge Detect Enable */
 462 +       irqchip->irq_set_type(irqdata,
 463 +                             IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING);
 464 +
 465 +       /* unmask the irq */
 466 +       irqchip->irq_unmask(irqdata);
 467 +
 468 +       spin_unlock_irqrestore(&lock, flags);
 469 +
 470 +       return 0;
 471 +}
 472 +
 473 +static void set_use_dec(void *data)
 474 +{
 475 +       unsigned long flags;
 476 +
 477 +       spin_lock_irqsave(&lock, flags);
 478 +
 479 +       /* GPIO Pin Falling/Rising Edge Detect Disable */
 480 +       irqchip->irq_set_type(irqdata, 0);
 481 +       irqchip->irq_mask(irqdata);
 482 +
 483 +       spin_unlock_irqrestore(&lock, flags);
 484 +
 485 +       free_irq(gpiochip->to_irq(gpiochip, gpio_in_pin), (void *) 0);
 486 +
 487 +       dprintk(KERN_INFO LIRC_DRIVER_NAME
 488 +               ": freed IRQ %d\n", gpiochip->to_irq(gpiochip, gpio_in_pin));
 489 +}
 490 +
 491 +static ssize_t lirc_write(struct file *file, const char *buf,
 492 +       size_t n, loff_t *ppos)
 493 +{
 494 +       int i, count;
 495 +       unsigned long flags;
 496 +       long delta = 0;
 497 +       int *wbuf;
 498 +
 499 +       count = n / sizeof(int);
 500 +       if (n % sizeof(int) || count % 2 == 0)
 501 +               return -EINVAL;
 502 +       wbuf = memdup_user(buf, n);
 503 +       if (IS_ERR(wbuf))
 504 +               return PTR_ERR(wbuf);
 505 +       spin_lock_irqsave(&lock, flags);
 506 +
 507 +       for (i = 0; i < count; i++) {
 508 +               if (i%2)
 509 +                       send_space(wbuf[i] - delta);
 510 +               else
 511 +                       delta = send_pulse(wbuf[i]);
 512 +       }
 513 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 514 +
 515 +       spin_unlock_irqrestore(&lock, flags);
 516 +       kfree(wbuf);
 517 +       return n;
 518 +}
 519 +
 520 +static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 521 +{
 522 +       int result;
 523 +       __u32 value;
 524 +
 525 +       switch (cmd) {
 526 +       case LIRC_GET_SEND_MODE:
 527 +               return -ENOIOCTLCMD;
 528 +               break;
 529 +
 530 +       case LIRC_SET_SEND_MODE:
 531 +               result = get_user(value, (__u32 *) arg);
 532 +               if (result)
 533 +                       return result;
 534 +               /* only LIRC_MODE_PULSE supported */
 535 +               if (value != LIRC_MODE_PULSE)
 536 +                       return -ENOSYS;
 537 +               break;
 538 +
 539 +       case LIRC_GET_LENGTH:
 540 +               return -ENOSYS;
 541 +               break;
 542 +
 543 +       case LIRC_SET_SEND_DUTY_CYCLE:
 544 +               dprintk("SET_SEND_DUTY_CYCLE\n");
 545 +               result = get_user(value, (__u32 *) arg);
 546 +               if (result)
 547 +                       return result;
 548 +               if (value <= 0 || value > 100)
 549 +                       return -EINVAL;
 550 +               return init_timing_params(value, freq);
 551 +               break;
 552 +
 553 +       case LIRC_SET_SEND_CARRIER:
 554 +               dprintk("SET_SEND_CARRIER\n");
 555 +               result = get_user(value, (__u32 *) arg);
 556 +               if (result)
 557 +                       return result;
 558 +               if (value > 500000 || value < 20000)
 559 +                       return -EINVAL;
 560 +               return init_timing_params(duty_cycle, value);
 561 +               break;
 562 +
 563 +       default:
 564 +               return lirc_dev_fop_ioctl(filep, cmd, arg);
 565 +       }
 566 +       return 0;
 567 +}
 568 +
 569 +static const struct file_operations lirc_fops = {
 570 +       .owner          = THIS_MODULE,
 571 +       .write          = lirc_write,
 572 +       .unlocked_ioctl = lirc_ioctl,
 573 +       .read           = lirc_dev_fop_read,
 574 +       .poll           = lirc_dev_fop_poll,
 575 +       .open           = lirc_dev_fop_open,
 576 +       .release        = lirc_dev_fop_close,
 577 +       .llseek         = no_llseek,
 578 +};
 579 +
 580 +static struct lirc_driver driver = {
 581 +       .name           = LIRC_DRIVER_NAME,
 582 +       .minor          = -1,
 583 +       .code_length    = 1,
 584 +       .sample_rate    = 0,
 585 +       .data           = NULL,
 586 +       .add_to_buf     = NULL,
 587 +       .rbuf           = &rbuf,
 588 +       .set_use_inc    = set_use_inc,
 589 +       .set_use_dec    = set_use_dec,
 590 +       .fops           = &lirc_fops,
 591 +       .dev            = NULL,
 592 +       .owner          = THIS_MODULE,
 593 +};
 594 +
 595 +static struct platform_driver lirc_rpi_driver = {
 596 +       .driver = {
 597 +               .name   = LIRC_DRIVER_NAME,
 598 +               .owner  = THIS_MODULE,
 599 +       },
 600 +};
 601 +
 602 +static int __init lirc_rpi_init(void)
 603 +{
 604 +       int result;
 605 +
 606 +       /* Init read buffer. */
 607 +       result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
 608 +       if (result < 0)
 609 +               return -ENOMEM;
 610 +
 611 +       result = platform_driver_register(&lirc_rpi_driver);
 612 +       if (result) {
 613 +               printk(KERN_ERR LIRC_DRIVER_NAME
 614 +                      ": lirc register returned %d\n", result);
 615 +               goto exit_buffer_free;
 616 +       }
 617 +
 618 +       lirc_rpi_dev = platform_device_alloc(LIRC_DRIVER_NAME, 0);
 619 +       if (!lirc_rpi_dev) {
 620 +               result = -ENOMEM;
 621 +               goto exit_driver_unregister;
 622 +       }
 623 +
 624 +       result = platform_device_add(lirc_rpi_dev);
 625 +       if (result)
 626 +               goto exit_device_put;
 627 +
 628 +       return 0;
 629 +
 630 +       exit_device_put:
 631 +       platform_device_put(lirc_rpi_dev);
 632 +
 633 +       exit_driver_unregister:
 634 +       platform_driver_unregister(&lirc_rpi_driver);
 635 +
 636 +       exit_buffer_free:
 637 +       lirc_buffer_free(&rbuf);
 638 +
 639 +       return result;
 640 +}
 641 +
 642 +static void lirc_rpi_exit(void)
 643 +{
 644 +       platform_device_unregister(lirc_rpi_dev);
 645 +       platform_driver_unregister(&lirc_rpi_driver);
 646 +       lirc_buffer_free(&rbuf);
 647 +}
 648 +
 649 +static int __init lirc_rpi_init_module(void)
 650 +{
 651 +       int result, i;
 652 +
 653 +       result = lirc_rpi_init();
 654 +       if (result)
 655 +               return result;
 656 +
 657 +       /* check if the module received valid gpio pin numbers */
 658 +       result = 0;
 659 +       if (gpio_in_pin != gpio_out_pin) {
 660 +               for(i = 0; (i < ARRAY_SIZE(valid_gpio_pins)) && (result != 2); i++) {
 661 +                       if (gpio_in_pin == valid_gpio_pins[i] ||
 662 +                          gpio_out_pin == valid_gpio_pins[i]) {
 663 +                               result++;
 664 +                       }
 665 +               }
 666 +       }
 667 +
 668 +       if (result != 2) {
 669 +               result = -EINVAL;
 670 +               printk(KERN_ERR LIRC_DRIVER_NAME
 671 +                      ": invalid GPIO pin(s) specified!\n");
 672 +               goto exit_rpi;
 673 +       }
 674 +
 675 +       result = init_port();
 676 +       if (result < 0)
 677 +               goto exit_rpi;
 678 +
 679 +       driver.features = LIRC_CAN_SET_SEND_DUTY_CYCLE |
 680 +                         LIRC_CAN_SET_SEND_CARRIER |
 681 +                         LIRC_CAN_SEND_PULSE |
 682 +                         LIRC_CAN_REC_MODE2;
 683 +
 684 +       driver.dev = &lirc_rpi_dev->dev;
 685 +       driver.minor = lirc_register_driver(&driver);
 686 +
 687 +       if (driver.minor < 0) {
 688 +               printk(KERN_ERR LIRC_DRIVER_NAME
 689 +                      ": device registration failed with %d\n", result);
 690 +               result = -EIO;
 691 +               goto exit_rpi;
 692 +       }
 693 +
 694 +       printk(KERN_INFO LIRC_DRIVER_NAME ": driver registered!\n");
 695 +
 696 +       return 0;
 697 +
 698 +       exit_rpi:
 699 +       lirc_rpi_exit();
 700 +
 701 +       return result;
 702 +}
 703 +
 704 +static void __exit lirc_rpi_exit_module(void)
 705 +{
 706 +       gpio_free(gpio_out_pin);
 707 +       gpio_free(gpio_in_pin);
 708 +
 709 +       lirc_rpi_exit();
 710 +
 711 +       lirc_unregister_driver(driver.minor);
 712 +       printk(KERN_INFO LIRC_DRIVER_NAME ": cleaned up module\n");
 713 +}
 714 +
 715 +module_init(lirc_rpi_init_module);
 716 +module_exit(lirc_rpi_exit_module);
 717 +
 718 +MODULE_DESCRIPTION("Infra-red receiver and blaster driver for Raspberry Pi GPIO.");
 719 +MODULE_AUTHOR("Aron Robert Szabo <aron@reon.hu>");
 720 +MODULE_AUTHOR("Michael Bishop <cleverca22@gmail.com>");
 721 +MODULE_LICENSE("GPL");
 722 +
 723 +module_param(gpio_out_pin, int, S_IRUGO);
 724 +MODULE_PARM_DESC(gpio_out_pin, "GPIO output/transmitter pin number of the BCM"
 725 +                " processor. Valid pin numbers are: 0, 1, 4, 8, 7, 9, 10, 11,"
 726 +                " 14, 15, 17, 18, 21, 22, 23, 24, 25, default 17");
 727 +
 728 +module_param(gpio_in_pin, int, S_IRUGO);
 729 +MODULE_PARM_DESC(gpio_in_pin, "GPIO input pin number of the BCM processor."
 730 +                " Valid pin numbers are: 0, 1, 4, 8, 7, 9, 10, 11, 14, 15,"
 731 +                " 17, 18, 21, 22, 23, 24, 25, default 18");
 732 +
 733 +module_param(sense, int, S_IRUGO);
 734 +MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
 735 +                " (0 = active high, 1 = active low )");
 736 +
 737 +module_param(softcarrier, bool, S_IRUGO);
 738 +MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
 739 +
 740 +module_param(invert, bool, S_IRUGO);
 741 +MODULE_PARM_DESC(invert, "Invert output (0 = off, 1 = on, default off");
 742 +
 743 +module_param(debug, bool, S_IRUGO | S_IWUSR);
 744 +MODULE_PARM_DESC(debug, "Enable debugging messages");
 745 --
 746 1.9.1
 747