target/linux/brcm2708/patches-4.14/950-0048-lirc-added-support-for-RaspberryPi-GPIO.patch

   1 From ecc83f926bd3cf3c9e62389494f39a0939949ef3 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 048/454] 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 lirc: Remove restriction on gpio pins that can be used with lirc
  10
  11 Compute Module, for example could use different pins
  12
  13 lirc_rpi: Add parameter to specify input pin pull
  14
  15 Depending on the connected IR circuitry it might be desirable to change the
  16 gpios internal pull from it pull-down default behaviour. Add a module
  17 parameter to allow the user to set it explicitly.
  18
  19 Signed-off-by: Julian Scheel <julian@jusst.de>
  20
  21 lirc-rpi: Use the higher-level irq control functions
  22
  23 This module used to access the irq_chip methods of the
  24 gpio controller directly, rather than going through the
  25 standard enable_irq/irq_set_irq_type functions. This
  26 caused problems on pinctrl-bcm2835 which only implements
  27 the irq_enable/disable methods and not irq_unmask/mask.
  28
  29 lirc-rpi: Correct the interrupt usage
  30
  31 1) Correct the use of enable_irq (i.e. don't call it so often)
  32 2) Correct the shutdown sequence.
  33 3) Avoid a bcm2708_gpio driver quirk by setting the irq flags earlier
  34
  35 lirc-rpi: use getnstimeofday instead of read_current_timer
  36
  37 read_current_timer isn't guaranteed to return values in
  38 microseconds, and indeed it doesn't on a Pi2.
  39
  40 Issue: linux#827
  41
  42 lirc-rpi: Add device tree support, and a suitable overlay
  43
  44 The overlay supports DT parameters that match the old module
  45 parameters, except that gpio_in_pull should be set using the
  46 strings "up", "down" or "off".
  47
  48 lirc-rpi: Also support pinctrl-bcm2835 in non-DT mode
  49
  50 fix auto-sense in lirc_rpi driver
  51
  52 On a Raspberry Pi 2, the lirc_rpi driver might receive spurious
  53 interrupts and change it's low-active / high-active setting.
  54 When this happens, the IR remote control stops working.
  55
  56 This patch disables this auto-detection if the 'sense' parameter
  57 was set in the device tree, making the driver robust to such
  58 spurious interrupts.
  59 ---
  60  drivers/staging/media/lirc/Kconfig    |   6 +
  61  drivers/staging/media/lirc/Makefile   |   1 +
  62  drivers/staging/media/lirc/lirc_rpi.c | 733 ++++++++++++++++++++++++++
  63  include/linux/platform_data/bcm2708.h |  23 +
  64  4 files changed, 763 insertions(+)
  65  create mode 100644 drivers/staging/media/lirc/lirc_rpi.c
  66  create mode 100644 include/linux/platform_data/bcm2708.h
  67
  68 --- a/drivers/staging/media/lirc/Kconfig
  69 +++ b/drivers/staging/media/lirc/Kconfig
  70 @@ -12,6 +12,12 @@ menuconfig LIRC_STAGING
  71
  72  if LIRC_STAGING
  73
  74 +config LIRC_RPI
  75 +       tristate "Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi"
  76 +       depends on LIRC
  77 +       help
  78 +         Driver for Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi
  79 +
  80  config LIRC_ZILOG
  81         tristate "Zilog/Hauppauge IR Transmitter"
  82         depends on LIRC && I2C
  83 --- a/drivers/staging/media/lirc/Makefile
  84 +++ b/drivers/staging/media/lirc/Makefile
  85 @@ -3,4 +3,5 @@
  86
  87  # Each configuration option enables a list of files.
  88
  89 +obj-$(CONFIG_LIRC_RPI)         += lirc_rpi.o
  90  obj-$(CONFIG_LIRC_ZILOG)       += lirc_zilog.o
  91 --- /dev/null
  92 +++ b/drivers/staging/media/lirc/lirc_rpi.c
  93 @@ -0,0 +1,733 @@
  94 +/*
  95 + * lirc_rpi.c
  96 + *
  97 + * lirc_rpi - Device driver that records pulse- and pause-lengths
  98 + *           (space-lengths) (just like the lirc_serial driver does)
  99 + *           between GPIO interrupt events on the Raspberry Pi.
 100 + *           Lots of code has been taken from the lirc_serial module,
 101 + *           so I would like say thanks to the authors.
 102 + *
 103 + * Copyright (C) 2012 Aron Robert Szabo <aron@reon.hu>,
 104 + *                   Michael Bishop <cleverca22@gmail.com>
 105 + *  This program is free software; you can redistribute it and/or modify
 106 + *  it under the terms of the GNU General Public License as published by
 107 + *  the Free Software Foundation; either version 2 of the License, or
 108 + *  (at your option) any later version.
 109 + *
 110 + *  This program is distributed in the hope that it will be useful,
 111 + *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 112 + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 113 + *  GNU General Public License for more details.
 114 + *
 115 + *  You should have received a copy of the GNU General Public License
 116 + *  along with this program; if not, write to the Free Software
 117 + *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 118 + */
 119 +
 120 +#include <linux/module.h>
 121 +#include <linux/errno.h>
 122 +#include <linux/interrupt.h>
 123 +#include <linux/sched.h>
 124 +#include <linux/kernel.h>
 125 +#include <linux/time.h>
 126 +#include <linux/timex.h>
 127 +#include <linux/timekeeping.h>
 128 +#include <linux/string.h>
 129 +#include <linux/delay.h>
 130 +#include <linux/platform_device.h>
 131 +#include <linux/irq.h>
 132 +#include <linux/spinlock.h>
 133 +#include <media/lirc.h>
 134 +#include <media/lirc_dev.h>
 135 +#include <linux/gpio.h>
 136 +#include <linux/of_platform.h>
 137 +#include <linux/platform_data/bcm2708.h>
 138 +
 139 +#define LIRC_DRIVER_NAME "lirc_rpi"
 140 +#define RBUF_LEN 256
 141 +#define LIRC_TRANSMITTER_LATENCY 50
 142 +
 143 +#ifndef MAX_UDELAY_MS
 144 +#define MAX_UDELAY_US 5000
 145 +#else
 146 +#define MAX_UDELAY_US (MAX_UDELAY_MS*1000)
 147 +#endif
 148 +
 149 +#define dprintk(fmt, args...)                                  \
 150 +       do {                                                    \
 151 +               if (debug)                                      \
 152 +                       printk(KERN_DEBUG LIRC_DRIVER_NAME ": " \
 153 +                              fmt, ## args);                   \
 154 +       } while (0)
 155 +
 156 +/* module parameters */
 157 +
 158 +/* set the default GPIO input pin */
 159 +static int gpio_in_pin = 18;
 160 +/* set the default pull behaviour for input pin */
 161 +static int gpio_in_pull = BCM2708_PULL_DOWN;
 162 +/* set the default GPIO output pin */
 163 +static int gpio_out_pin = 17;
 164 +/* enable debugging messages */
 165 +static bool debug;
 166 +/* -1 = auto, 0 = active high, 1 = active low */
 167 +static int sense = -1;
 168 +/* use softcarrier by default */
 169 +static bool softcarrier = 1;
 170 +/* 0 = do not invert output, 1 = invert output */
 171 +static bool invert = 0;
 172 +
 173 +struct gpio_chip *gpiochip;
 174 +static int irq_num;
 175 +static int auto_sense = 1;
 176 +
 177 +/* forward declarations */
 178 +static long send_pulse(unsigned long length);
 179 +static void send_space(long length);
 180 +static void lirc_rpi_exit(void);
 181 +
 182 +static struct platform_device *lirc_rpi_dev;
 183 +static struct timeval lasttv = { 0, 0 };
 184 +static struct lirc_buffer rbuf;
 185 +static spinlock_t lock;
 186 +
 187 +/* initialized/set in init_timing_params() */
 188 +static unsigned int freq = 38000;
 189 +static unsigned int duty_cycle = 50;
 190 +static unsigned long period;
 191 +static unsigned long pulse_width;
 192 +static unsigned long space_width;
 193 +
 194 +static void safe_udelay(unsigned long usecs)
 195 +{
 196 +       while (usecs > MAX_UDELAY_US) {
 197 +               udelay(MAX_UDELAY_US);
 198 +               usecs -= MAX_UDELAY_US;
 199 +       }
 200 +       udelay(usecs);
 201 +}
 202 +
 203 +static unsigned long read_current_us(void)
 204 +{
 205 +       struct timespec now;
 206 +       getnstimeofday(&now);
 207 +       return (now.tv_sec * 1000000) + (now.tv_nsec/1000);
 208 +}
 209 +
 210 +static int init_timing_params(unsigned int new_duty_cycle,
 211 +       unsigned int new_freq)
 212 +{
 213 +       if (1000 * 1000000L / new_freq * new_duty_cycle / 100 <=
 214 +           LIRC_TRANSMITTER_LATENCY)
 215 +               return -EINVAL;
 216 +       if (1000 * 1000000L / new_freq * (100 - new_duty_cycle) / 100 <=
 217 +           LIRC_TRANSMITTER_LATENCY)
 218 +               return -EINVAL;
 219 +       duty_cycle = new_duty_cycle;
 220 +       freq = new_freq;
 221 +       period = 1000 * 1000000L / freq;
 222 +       pulse_width = period * duty_cycle / 100;
 223 +       space_width = period - pulse_width;
 224 +       dprintk("in init_timing_params, freq=%d pulse=%ld, "
 225 +               "space=%ld\n", freq, pulse_width, space_width);
 226 +       return 0;
 227 +}
 228 +
 229 +static long send_pulse_softcarrier(unsigned long length)
 230 +{
 231 +       int flag;
 232 +       unsigned long actual, target;
 233 +       unsigned long actual_us, initial_us, target_us;
 234 +
 235 +       length *= 1000;
 236 +
 237 +       actual = 0; target = 0; flag = 0;
 238 +       actual_us = read_current_us();
 239 +
 240 +       while (actual < length) {
 241 +               if (flag) {
 242 +                       gpiochip->set(gpiochip, gpio_out_pin, invert);
 243 +                       target += space_width;
 244 +               } else {
 245 +                       gpiochip->set(gpiochip, gpio_out_pin, !invert);
 246 +                       target += pulse_width;
 247 +               }
 248 +               initial_us = actual_us;
 249 +               target_us = actual_us + (target - actual) / 1000;
 250 +               /*
 251 +                * Note - we've checked in ioctl that the pulse/space
 252 +                * widths are big enough so that d is > 0
 253 +                */
 254 +               if  ((int)(target_us - actual_us) > 0)
 255 +                       udelay(target_us - actual_us);
 256 +               actual_us = read_current_us();
 257 +               actual += (actual_us - initial_us) * 1000;
 258 +               flag = !flag;
 259 +       }
 260 +       return (actual-length) / 1000;
 261 +}
 262 +
 263 +static long send_pulse(unsigned long length)
 264 +{
 265 +       if (length <= 0)
 266 +               return 0;
 267 +
 268 +       if (softcarrier) {
 269 +               return send_pulse_softcarrier(length);
 270 +       } else {
 271 +               gpiochip->set(gpiochip, gpio_out_pin, !invert);
 272 +               safe_udelay(length);
 273 +               return 0;
 274 +       }
 275 +}
 276 +
 277 +static void send_space(long length)
 278 +{
 279 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 280 +       if (length <= 0)
 281 +               return;
 282 +       safe_udelay(length);
 283 +}
 284 +
 285 +static void rbwrite(int l)
 286 +{
 287 +       if (lirc_buffer_full(&rbuf)) {
 288 +               /* no new signals will be accepted */
 289 +               dprintk("Buffer overrun\n");
 290 +               return;
 291 +       }
 292 +       lirc_buffer_write(&rbuf, (void *)&l);
 293 +}
 294 +
 295 +static void frbwrite(int l)
 296 +{
 297 +       /* simple noise filter */
 298 +       static int pulse, space;
 299 +       static unsigned int ptr;
 300 +
 301 +       if (ptr > 0 && (l & PULSE_BIT)) {
 302 +               pulse += l & PULSE_MASK;
 303 +               if (pulse > 250) {
 304 +                       rbwrite(space);
 305 +                       rbwrite(pulse | PULSE_BIT);
 306 +                       ptr = 0;
 307 +                       pulse = 0;
 308 +               }
 309 +               return;
 310 +       }
 311 +       if (!(l & PULSE_BIT)) {
 312 +               if (ptr == 0) {
 313 +                       if (l > 20000) {
 314 +                               space = l;
 315 +                               ptr++;
 316 +                               return;
 317 +                       }
 318 +               } else {
 319 +                       if (l > 20000) {
 320 +                               space += pulse;
 321 +                               if (space > PULSE_MASK)
 322 +                                       space = PULSE_MASK;
 323 +                               space += l;
 324 +                               if (space > PULSE_MASK)
 325 +                                       space = PULSE_MASK;
 326 +                               pulse = 0;
 327 +                               return;
 328 +                       }
 329 +                       rbwrite(space);
 330 +                       rbwrite(pulse | PULSE_BIT);
 331 +                       ptr = 0;
 332 +                       pulse = 0;
 333 +               }
 334 +       }
 335 +       rbwrite(l);
 336 +}
 337 +
 338 +static irqreturn_t irq_handler(int i, void *blah, struct pt_regs *regs)
 339 +{
 340 +       struct timeval tv;
 341 +       long deltv;
 342 +       int data;
 343 +       int signal;
 344 +
 345 +       /* use the GPIO signal level */
 346 +       signal = gpiochip->get(gpiochip, gpio_in_pin);
 347 +
 348 +       if (sense != -1) {
 349 +               /* get current time */
 350 +               do_gettimeofday(&tv);
 351 +
 352 +               /* calc time since last interrupt in microseconds */
 353 +               deltv = tv.tv_sec-lasttv.tv_sec;
 354 +               if (tv.tv_sec < lasttv.tv_sec ||
 355 +                   (tv.tv_sec == lasttv.tv_sec &&
 356 +                    tv.tv_usec < lasttv.tv_usec)) {
 357 +                       printk(KERN_WARNING LIRC_DRIVER_NAME
 358 +                              ": AIEEEE: your clock just jumped backwards\n");
 359 +                       printk(KERN_WARNING LIRC_DRIVER_NAME
 360 +                              ": %d %d %lx %lx %lx %lx\n", signal, sense,
 361 +                              tv.tv_sec, lasttv.tv_sec,
 362 +                              tv.tv_usec, lasttv.tv_usec);
 363 +                       data = PULSE_MASK;
 364 +               } else if (deltv > 15) {
 365 +                       data = PULSE_MASK; /* really long time */
 366 +                       if (!(signal^sense)) {
 367 +                               /* sanity check */
 368 +                               printk(KERN_DEBUG LIRC_DRIVER_NAME
 369 +                                      ": AIEEEE: %d %d %lx %lx %lx %lx\n",
 370 +                                      signal, sense, tv.tv_sec, lasttv.tv_sec,
 371 +                                      tv.tv_usec, lasttv.tv_usec);
 372 +                               /*
 373 +                                * detecting pulse while this
 374 +                                * MUST be a space!
 375 +                                */
 376 +                               if (auto_sense) {
 377 +                                       sense = sense ? 0 : 1;
 378 +                               }
 379 +                       }
 380 +               } else {
 381 +                       data = (int) (deltv*1000000 +
 382 +                                     (tv.tv_usec - lasttv.tv_usec));
 383 +               }
 384 +               frbwrite(signal^sense ? data : (data|PULSE_BIT));
 385 +               lasttv = tv;
 386 +               wake_up_interruptible(&rbuf.wait_poll);
 387 +       }
 388 +
 389 +       return IRQ_HANDLED;
 390 +}
 391 +
 392 +static int is_right_chip(struct gpio_chip *chip, void *data)
 393 +{
 394 +       dprintk("is_right_chip %s %d\n", chip->label, strcmp(data, chip->label));
 395 +
 396 +       if (strcmp(data, chip->label) == 0)
 397 +               return 1;
 398 +       return 0;
 399 +}
 400 +
 401 +static inline int read_bool_property(const struct device_node *np,
 402 +                                    const char *propname,
 403 +                                    bool *out_value)
 404 +{
 405 +       u32 value = 0;
 406 +       int err = of_property_read_u32(np, propname, &value);
 407 +       if (err == 0)
 408 +               *out_value = (value != 0);
 409 +       return err;
 410 +}
 411 +
 412 +static void read_pin_settings(struct device_node *node)
 413 +{
 414 +       u32 pin;
 415 +       int index;
 416 +
 417 +       for (index = 0;
 418 +            of_property_read_u32_index(
 419 +                    node,
 420 +                    "brcm,pins",
 421 +                    index,
 422 +                    &pin) == 0;
 423 +            index++) {
 424 +               u32 function;
 425 +               int err;
 426 +               err = of_property_read_u32_index(
 427 +                       node,
 428 +                       "brcm,function",
 429 +                       index,
 430 +                       &function);
 431 +               if (err == 0) {
 432 +                       if (function == 1) /* Output */
 433 +                               gpio_out_pin = pin;
 434 +                       else if (function == 0) /* Input */
 435 +                               gpio_in_pin = pin;
 436 +               }
 437 +       }
 438 +}
 439 +
 440 +static int init_port(void)
 441 +{
 442 +       int i, nlow, nhigh;
 443 +       struct device_node *node;
 444 +
 445 +       node = lirc_rpi_dev->dev.of_node;
 446 +
 447 +       gpiochip = gpiochip_find("bcm2708_gpio", is_right_chip);
 448 +
 449 +       /*
 450 +        * Because of the lack of a setpull function, only support
 451 +        * pinctrl-bcm2835 if using device tree.
 452 +       */
 453 +       if (!gpiochip && node)
 454 +               gpiochip = gpiochip_find("pinctrl-bcm2835", is_right_chip);
 455 +
 456 +       if (!gpiochip) {
 457 +               pr_err(LIRC_DRIVER_NAME ": gpio chip not found!\n");
 458 +               return -ENODEV;
 459 +       }
 460 +
 461 +       if (node) {
 462 +               struct device_node *pins_node;
 463 +
 464 +               pins_node = of_parse_phandle(node, "pinctrl-0", 0);
 465 +               if (!pins_node) {
 466 +                       printk(KERN_ERR LIRC_DRIVER_NAME
 467 +                              ": pinctrl settings not found!\n");
 468 +                       return -EINVAL;
 469 +               }
 470 +
 471 +               read_pin_settings(pins_node);
 472 +
 473 +               of_property_read_u32(node, "rpi,sense", &sense);
 474 +
 475 +               read_bool_property(node, "rpi,softcarrier", &softcarrier);
 476 +
 477 +               read_bool_property(node, "rpi,invert", &invert);
 478 +
 479 +               read_bool_property(node, "rpi,debug", &debug);
 480 +
 481 +       } else {
 482 +               return -EINVAL;
 483 +       }
 484 +
 485 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 486 +
 487 +       irq_num = gpiochip->to_irq(gpiochip, gpio_in_pin);
 488 +       dprintk("to_irq %d\n", irq_num);
 489 +
 490 +       /* if pin is high, then this must be an active low receiver. */
 491 +       if (sense == -1) {
 492 +               /* wait 1/2 sec for the power supply */
 493 +               msleep(500);
 494 +
 495 +               /*
 496 +                * probe 9 times every 0.04s, collect "votes" for
 497 +                * active high/low
 498 +                */
 499 +               nlow = 0;
 500 +               nhigh = 0;
 501 +               for (i = 0; i < 9; i++) {
 502 +                       if (gpiochip->get(gpiochip, gpio_in_pin))
 503 +                               nlow++;
 504 +                       else
 505 +                               nhigh++;
 506 +                       msleep(40);
 507 +               }
 508 +               sense = (nlow >= nhigh ? 1 : 0);
 509 +               printk(KERN_INFO LIRC_DRIVER_NAME
 510 +                      ": auto-detected active %s receiver on GPIO pin %d\n",
 511 +                      sense ? "low" : "high", gpio_in_pin);
 512 +       } else {
 513 +               printk(KERN_INFO LIRC_DRIVER_NAME
 514 +                      ": manually using active %s receiver on GPIO pin %d\n",
 515 +                      sense ? "low" : "high", gpio_in_pin);
 516 +               auto_sense = 0;
 517 +       }
 518 +
 519 +       return 0;
 520 +}
 521 +
 522 +// called when the character device is opened
 523 +static int set_use_inc(void *data)
 524 +{
 525 +       int result;
 526 +
 527 +       /* initialize timestamp */
 528 +       do_gettimeofday(&lasttv);
 529 +
 530 +       result = request_irq(irq_num,
 531 +                            (irq_handler_t) irq_handler,
 532 +                            IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING,
 533 +                            LIRC_DRIVER_NAME, (void*) 0);
 534 +
 535 +       switch (result) {
 536 +       case -EBUSY:
 537 +               printk(KERN_ERR LIRC_DRIVER_NAME
 538 +                      ": IRQ %d is busy\n",
 539 +                      irq_num);
 540 +               return -EBUSY;
 541 +       case -EINVAL:
 542 +               printk(KERN_ERR LIRC_DRIVER_NAME
 543 +                      ": Bad irq number or handler\n");
 544 +               return -EINVAL;
 545 +       default:
 546 +               dprintk("Interrupt %d obtained\n",
 547 +                       irq_num);
 548 +               break;
 549 +       };
 550 +
 551 +       /* initialize pulse/space widths */
 552 +       init_timing_params(duty_cycle, freq);
 553 +
 554 +       return 0;
 555 +}
 556 +
 557 +static void set_use_dec(void *data)
 558 +{
 559 +       /* GPIO Pin Falling/Rising Edge Detect Disable */
 560 +       irq_set_irq_type(irq_num, 0);
 561 +       disable_irq(irq_num);
 562 +
 563 +       free_irq(irq_num, (void *) 0);
 564 +
 565 +       dprintk(KERN_INFO LIRC_DRIVER_NAME
 566 +               ": freed IRQ %d\n", irq_num);
 567 +}
 568 +
 569 +static ssize_t lirc_write(struct file *file, const char *buf,
 570 +       size_t n, loff_t *ppos)
 571 +{
 572 +       int i, count;
 573 +       unsigned long flags;
 574 +       long delta = 0;
 575 +       int *wbuf;
 576 +
 577 +       count = n / sizeof(int);
 578 +       if (n % sizeof(int) || count % 2 == 0)
 579 +               return -EINVAL;
 580 +       wbuf = memdup_user(buf, n);
 581 +       if (IS_ERR(wbuf))
 582 +               return PTR_ERR(wbuf);
 583 +       spin_lock_irqsave(&lock, flags);
 584 +
 585 +       for (i = 0; i < count; i++) {
 586 +               if (i%2)
 587 +                       send_space(wbuf[i] - delta);
 588 +               else
 589 +                       delta = send_pulse(wbuf[i]);
 590 +       }
 591 +       gpiochip->set(gpiochip, gpio_out_pin, invert);
 592 +
 593 +       spin_unlock_irqrestore(&lock, flags);
 594 +       kfree(wbuf);
 595 +       return n;
 596 +}
 597 +
 598 +static long lirc_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
 599 +{
 600 +       int result;
 601 +       __u32 value;
 602 +
 603 +       switch (cmd) {
 604 +       case LIRC_GET_SEND_MODE:
 605 +               return -ENOIOCTLCMD;
 606 +               break;
 607 +
 608 +       case LIRC_SET_SEND_MODE:
 609 +               result = get_user(value, (__u32 *) arg);
 610 +               if (result)
 611 +                       return result;
 612 +               /* only LIRC_MODE_PULSE supported */
 613 +               if (value != LIRC_MODE_PULSE)
 614 +                       return -ENOSYS;
 615 +               break;
 616 +
 617 +       case LIRC_GET_LENGTH:
 618 +               return -ENOSYS;
 619 +               break;
 620 +
 621 +       case LIRC_SET_SEND_DUTY_CYCLE:
 622 +               dprintk("SET_SEND_DUTY_CYCLE\n");
 623 +               result = get_user(value, (__u32 *) arg);
 624 +               if (result)
 625 +                       return result;
 626 +               if (value <= 0 || value > 100)
 627 +                       return -EINVAL;
 628 +               return init_timing_params(value, freq);
 629 +               break;
 630 +
 631 +       case LIRC_SET_SEND_CARRIER:
 632 +               dprintk("SET_SEND_CARRIER\n");
 633 +               result = get_user(value, (__u32 *) arg);
 634 +               if (result)
 635 +                       return result;
 636 +               if (value > 500000 || value < 20000)
 637 +                       return -EINVAL;
 638 +               return init_timing_params(duty_cycle, value);
 639 +               break;
 640 +
 641 +       default:
 642 +               return lirc_dev_fop_ioctl(filep, cmd, arg);
 643 +       }
 644 +       return 0;
 645 +}
 646 +
 647 +static const struct file_operations lirc_fops = {
 648 +       .owner          = THIS_MODULE,
 649 +       .write          = lirc_write,
 650 +       .unlocked_ioctl = lirc_ioctl,
 651 +       .read           = lirc_dev_fop_read,
 652 +       .poll           = lirc_dev_fop_poll,
 653 +       .open           = lirc_dev_fop_open,
 654 +       .release        = lirc_dev_fop_close,
 655 +       .llseek         = no_llseek,
 656 +};
 657 +
 658 +static struct lirc_driver driver = {
 659 +       .name           = LIRC_DRIVER_NAME,
 660 +       .minor          = -1,
 661 +       .code_length    = 1,
 662 +       .data           = NULL,
 663 +       .rbuf           = &rbuf,
 664 +       .fops           = &lirc_fops,
 665 +       .dev            = NULL,
 666 +       .owner          = THIS_MODULE,
 667 +};
 668 +
 669 +static const struct of_device_id lirc_rpi_of_match[] = {
 670 +       { .compatible = "rpi,lirc-rpi", },
 671 +       {},
 672 +};
 673 +MODULE_DEVICE_TABLE(of, lirc_rpi_of_match);
 674 +
 675 +static struct platform_driver lirc_rpi_driver = {
 676 +       .driver = {
 677 +               .name   = LIRC_DRIVER_NAME,
 678 +               .owner  = THIS_MODULE,
 679 +               .of_match_table = of_match_ptr(lirc_rpi_of_match),
 680 +       },
 681 +};
 682 +
 683 +static int __init lirc_rpi_init(void)
 684 +{
 685 +       struct device_node *node;
 686 +       int result;
 687 +
 688 +       /* Init read buffer. */
 689 +       result = lirc_buffer_init(&rbuf, sizeof(int), RBUF_LEN);
 690 +       if (result < 0)
 691 +               return -ENOMEM;
 692 +
 693 +       result = platform_driver_register(&lirc_rpi_driver);
 694 +       if (result) {
 695 +               printk(KERN_ERR LIRC_DRIVER_NAME
 696 +                      ": lirc register returned %d\n", result);
 697 +               goto exit_buffer_free;
 698 +       }
 699 +
 700 +       node = of_find_compatible_node(NULL, NULL,
 701 +                                      lirc_rpi_of_match[0].compatible);
 702 +
 703 +       if (node) {
 704 +               /* DT-enabled */
 705 +               lirc_rpi_dev = of_find_device_by_node(node);
 706 +               WARN_ON(lirc_rpi_dev->dev.of_node != node);
 707 +               of_node_put(node);
 708 +       }
 709 +       else {
 710 +               lirc_rpi_dev = platform_device_alloc(LIRC_DRIVER_NAME, 0);
 711 +               if (!lirc_rpi_dev) {
 712 +                       result = -ENOMEM;
 713 +                       goto exit_driver_unregister;
 714 +               }
 715 +
 716 +               result = platform_device_add(lirc_rpi_dev);
 717 +               if (result)
 718 +                       goto exit_device_put;
 719 +       }
 720 +
 721 +       return 0;
 722 +
 723 +       exit_device_put:
 724 +       platform_device_put(lirc_rpi_dev);
 725 +
 726 +       exit_driver_unregister:
 727 +       platform_driver_unregister(&lirc_rpi_driver);
 728 +
 729 +       exit_buffer_free:
 730 +       lirc_buffer_free(&rbuf);
 731 +
 732 +       return result;
 733 +}
 734 +
 735 +static void lirc_rpi_exit(void)
 736 +{
 737 +       set_use_dec(NULL);
 738 +       if (!lirc_rpi_dev->dev.of_node)
 739 +               platform_device_unregister(lirc_rpi_dev);
 740 +       platform_driver_unregister(&lirc_rpi_driver);
 741 +       lirc_buffer_free(&rbuf);
 742 +}
 743 +
 744 +static int __init lirc_rpi_init_module(void)
 745 +{
 746 +       int result;
 747 +
 748 +       result = lirc_rpi_init();
 749 +       if (result)
 750 +               return result;
 751 +
 752 +       result = init_port();
 753 +       if (result < 0)
 754 +               goto exit_rpi;
 755 +
 756 +       driver.features = LIRC_CAN_SET_SEND_DUTY_CYCLE |
 757 +                         LIRC_CAN_SET_SEND_CARRIER |
 758 +                         LIRC_CAN_SEND_PULSE |
 759 +                         LIRC_CAN_REC_MODE2;
 760 +
 761 +       driver.dev = &lirc_rpi_dev->dev;
 762 +       driver.minor = lirc_register_driver(&driver);
 763 +
 764 +       if (driver.minor < 0) {
 765 +               printk(KERN_ERR LIRC_DRIVER_NAME
 766 +                      ": device registration failed with %d\n", result);
 767 +               result = -EIO;
 768 +               goto exit_rpi;
 769 +       }
 770 +
 771 +       printk(KERN_INFO LIRC_DRIVER_NAME ": driver registered!\n");
 772 +
 773 +       set_use_inc(NULL);
 774 +
 775 +       return 0;
 776 +
 777 +       exit_rpi:
 778 +       lirc_rpi_exit();
 779 +
 780 +       return result;
 781 +}
 782 +
 783 +static void __exit lirc_rpi_exit_module(void)
 784 +{
 785 +       lirc_unregister_driver(driver.minor);
 786 +
 787 +       gpio_free(gpio_out_pin);
 788 +       gpio_free(gpio_in_pin);
 789 +
 790 +       lirc_rpi_exit();
 791 +
 792 +       printk(KERN_INFO LIRC_DRIVER_NAME ": cleaned up module\n");
 793 +}
 794 +
 795 +module_init(lirc_rpi_init_module);
 796 +module_exit(lirc_rpi_exit_module);
 797 +
 798 +MODULE_DESCRIPTION("Infra-red receiver and blaster driver for Raspberry Pi GPIO.");
 799 +MODULE_AUTHOR("Aron Robert Szabo <aron@reon.hu>");
 800 +MODULE_AUTHOR("Michael Bishop <cleverca22@gmail.com>");
 801 +MODULE_LICENSE("GPL");
 802 +
 803 +module_param(gpio_out_pin, int, S_IRUGO);
 804 +MODULE_PARM_DESC(gpio_out_pin, "GPIO output/transmitter pin number of the BCM"
 805 +                " processor. (default 17");
 806 +
 807 +module_param(gpio_in_pin, int, S_IRUGO);
 808 +MODULE_PARM_DESC(gpio_in_pin, "GPIO input pin number of the BCM processor."
 809 +                " (default 18");
 810 +
 811 +module_param(gpio_in_pull, int, S_IRUGO);
 812 +MODULE_PARM_DESC(gpio_in_pull, "GPIO input pin pull configuration."
 813 +                " (0 = off, 1 = up, 2 = down, default down)");
 814 +
 815 +module_param(sense, int, S_IRUGO);
 816 +MODULE_PARM_DESC(sense, "Override autodetection of IR receiver circuit"
 817 +                " (0 = active high, 1 = active low )");
 818 +
 819 +module_param(softcarrier, bool, S_IRUGO);
 820 +MODULE_PARM_DESC(softcarrier, "Software carrier (0 = off, 1 = on, default on)");
 821 +
 822 +module_param(invert, bool, S_IRUGO);
 823 +MODULE_PARM_DESC(invert, "Invert output (0 = off, 1 = on, default off");
 824 +
 825 +module_param(debug, bool, S_IRUGO | S_IWUSR);
 826 +MODULE_PARM_DESC(debug, "Enable debugging messages");
 827 --- /dev/null
 828 +++ b/include/linux/platform_data/bcm2708.h
 829 @@ -0,0 +1,23 @@
 830 +/*
 831 + * include/linux/platform_data/bcm2708.h
 832 + *
 833 + * This program is free software; you can redistribute it and/or modify
 834 + * it under the terms of the GNU General Public License version 2 as
 835 + * published by the Free Software Foundation.
 836 + *
 837 + * (C) 2014 Julian Scheel <julian@jusst.de>
 838 + *
 839 + */
 840 +#ifndef __BCM2708_H_
 841 +#define __BCM2708_H_
 842 +
 843 +typedef enum {
 844 +       BCM2708_PULL_OFF,
 845 +       BCM2708_PULL_UP,
 846 +       BCM2708_PULL_DOWN
 847 +} bcm2708_gpio_pull_t;
 848 +
 849 +extern int bcm2708_gpio_setpull(struct gpio_chip *gc, unsigned offset,
 850 +               bcm2708_gpio_pull_t value);
 851 +
 852 +#endif