target/linux/brcm2708/patches-4.4/0380-media-rc-gpio-ir-recv-add-timeout-on-idle.patch

   1 From 87909c64d14dc0f907ebe95f77874075a75e7f66 Mon Sep 17 00:00:00 2001
   2 From: Eric Nelson <eric@nelint.com>
   3 Date: Wed, 23 Sep 2015 11:07:08 -0300
   4 Subject: [PATCH 380/423] [media] rc: gpio-ir-recv: add timeout on idle
   5
   6 Many decoders require a trailing space (period without IR illumination)
   7 to be delivered before completing a decode.
   8
   9 Since the gpio-ir-recv driver only delivers events on gpio transitions,
  10 a single IR symbol (caused by a quick touch on an IR remote) will not
  11 be properly decoded without the use of a timer to flush the tail end
  12 state of the IR receiver.
  13
  14 This patch initializes and uses a timer and the timeout field of rcdev
  15 to complete the stream and allow decode.
  16
  17 The timeout can be overridden through the use of the LIRC_SET_REC_TIMEOUT
  18 ioctl.
  19
  20 Signed-off-by: Eric Nelson <eric@nelint.com>
  21 Acked-by: Sean Young <sean@mess.org>
  22 Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
  23 ---
  24  drivers/media/rc/gpio-ir-recv.c | 22 ++++++++++++++++++++++
  25  1 file changed, 22 insertions(+)
  26
  27 --- a/drivers/media/rc/gpio-ir-recv.c
  28 +++ b/drivers/media/rc/gpio-ir-recv.c
  29 @@ -30,6 +30,7 @@ struct gpio_rc_dev {
  30         struct rc_dev *rcdev;
  31         int gpio_nr;
  32         bool active_low;
  33 +       struct timer_list flush_timer;
  34  };
  35
  36  #ifdef CONFIG_OF
  37 @@ -93,12 +94,26 @@ static irqreturn_t gpio_ir_recv_irq(int
  38         if (rc < 0)
  39                 goto err_get_value;
  40
  41 +       mod_timer(&gpio_dev->flush_timer,
  42 +                 jiffies + nsecs_to_jiffies(gpio_dev->rcdev->timeout));
  43 +
  44         ir_raw_event_handle(gpio_dev->rcdev);
  45
  46  err_get_value:
  47         return IRQ_HANDLED;
  48  }
  49
  50 +static void flush_timer(unsigned long arg)
  51 +{
  52 +       struct gpio_rc_dev *gpio_dev = (struct gpio_rc_dev *)arg;
  53 +       DEFINE_IR_RAW_EVENT(ev);
  54 +
  55 +       ev.timeout = true;
  56 +       ev.duration = gpio_dev->rcdev->timeout;
  57 +       ir_raw_event_store(gpio_dev->rcdev, &ev);
  58 +       ir_raw_event_handle(gpio_dev->rcdev);
  59 +}
  60 +
  61  static int gpio_ir_recv_probe(struct platform_device *pdev)
  62  {
  63         struct gpio_rc_dev *gpio_dev;
  64 @@ -144,6 +159,9 @@ static int gpio_ir_recv_probe(struct pla
  65         rcdev->input_id.version = 0x0100;
  66         rcdev->dev.parent = &pdev->dev;
  67         rcdev->driver_name = GPIO_IR_DRIVER_NAME;
  68 +       rcdev->min_timeout = 0;
  69 +       rcdev->timeout = IR_DEFAULT_TIMEOUT;
  70 +       rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
  71         if (pdata->allowed_protos)
  72                 rcdev->allowed_protocols = pdata->allowed_protos;
  73         else
  74 @@ -154,6 +172,9 @@ static int gpio_ir_recv_probe(struct pla
  75         gpio_dev->gpio_nr = pdata->gpio_nr;
  76         gpio_dev->active_low = pdata->active_low;
  77
  78 +       setup_timer(&gpio_dev->flush_timer, flush_timer,
  79 +                   (unsigned long)gpio_dev);
  80 +
  81         rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
  82         if (rc < 0)
  83                 goto err_gpio_request;
  84 @@ -196,6 +217,7 @@ static int gpio_ir_recv_remove(struct pl
  85         struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
  86
  87         free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
  88 +       del_timer_sync(&gpio_dev->flush_timer);
  89         rc_unregister_device(gpio_dev->rcdev);
  90         gpio_free(gpio_dev->gpio_nr);
  91         kfree(gpio_dev);