Many decoders require a trailing space (period without IR illumination)
to be delivered before completing a decode.
Since the gpio-ir-recv driver only delivers events on gpio transitions,
a single IR symbol (caused by a quick touch on an IR remote) will not
be properly decoded without the use of a timer to flush the tail end
state of the IR receiver.
This patch initializes and uses a timer and the timeout field of rcdev
to complete the stream and allow decode.
The timeout can be overridden through the use of the LIRC_SET_REC_TIMEOUT
ioctl.
Signed-off-by: Eric Nelson <eric@xxxxxxxxxx>
---
V2 uses the timeout field of the rcdev instead of a device tree
field to set the timeout value as suggested by Sean Young.
V3 fixes whitespace, simplifies timer setup and adds a del_timer_sync
as suggested by Sean Young.
drivers/media/rc/gpio-ir-recv.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/media/rc/gpio-ir-recv.c b/drivers/media/rc/gpio-ir-recv.c
index 7dbc9ca..f62e3f1 100644
--- a/drivers/media/rc/gpio-ir-recv.c
+++ b/drivers/media/rc/gpio-ir-recv.c
@@ -30,6 +30,7 @@ struct gpio_rc_dev {
struct rc_dev *rcdev;
int gpio_nr;
bool active_low;
+ struct timer_list flush_timer;
};
#ifdef CONFIG_OF
@@ -93,12 +94,26 @@ static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
if (rc < 0)
goto err_get_value;
+ mod_timer(&gpio_dev->flush_timer,
+ jiffies + nsecs_to_jiffies(gpio_dev->rcdev->timeout));
+
ir_raw_event_handle(gpio_dev->rcdev);
err_get_value:
return IRQ_HANDLED;
}
+static void flush_timer(unsigned long arg)
+{
+ struct gpio_rc_dev *gpio_dev = (struct gpio_rc_dev *)arg;
+ DEFINE_IR_RAW_EVENT(ev);
+
+ ev.timeout = true;
+ ev.duration = gpio_dev->rcdev->timeout;
+ ir_raw_event_store(gpio_dev->rcdev, &ev);
+ ir_raw_event_handle(gpio_dev->rcdev);
+}
+
static int gpio_ir_recv_probe(struct platform_device *pdev)
{
struct gpio_rc_dev *gpio_dev;
@@ -144,6 +159,9 @@ static int gpio_ir_recv_probe(struct platform_device *pdev)
rcdev->input_id.version = 0x0100;
rcdev->dev.parent = &pdev->dev;
rcdev->driver_name = GPIO_IR_DRIVER_NAME;
+ rcdev->min_timeout = 0;
+ rcdev->timeout = IR_DEFAULT_TIMEOUT;
+ rcdev->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
if (pdata->allowed_protos)
rcdev->allowed_protocols = pdata->allowed_protos;
else
@@ -154,6 +172,9 @@ static int gpio_ir_recv_probe(struct platform_device *pdev)
gpio_dev->gpio_nr = pdata->gpio_nr;
gpio_dev->active_low = pdata->active_low;
+ setup_timer(&gpio_dev->flush_timer, flush_timer,
+ (unsigned long)gpio_dev);
+
rc = gpio_request(pdata->gpio_nr, "gpio-ir-recv");
if (rc < 0)
goto err_gpio_request;
@@ -196,6 +217,7 @@ static int gpio_ir_recv_remove(struct platform_device *pdev)
struct gpio_rc_dev *gpio_dev = platform_get_drvdata(pdev);
free_irq(gpio_to_irq(gpio_dev->gpio_nr), gpio_dev);
+ del_timer_sync(&gpio_dev->flush_timer);
rc_unregister_device(gpio_dev->rcdev);
gpio_free(gpio_dev->gpio_nr);
kfree(gpio_dev);
--
2.5.2
--
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