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Commit 2fd7f398 authored by Sebastian Hesselbarth's avatar Sebastian Hesselbarth Committed by Mauro Carvalho Chehab
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[media] media: rc: gpio-ir-recv: add support for device tree parsing 



This patch adds device tree parsing for gpio_ir_recv platform_data and
the mandatory binding documentation. It basically follows what we already
have for e.g. gpio_keys. All required device tree properties are OS
independent but an optional property allows linux specific support for rc
maps.

Signed-off-by: default avatarSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Reviewed-by: default avatarSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent b940a221

Documentation/devicetree/bindings/media/gpio-ir-receiver.txt

0 → 100644
+16 −0
Original line number Diff line number Diff line 
Device-Tree bindings for GPIO IR receiver



Required properties:

	- compatible: should be "gpio-ir-receiver".

	- gpios: specifies GPIO used for IR signal reception.



Optional properties:

	- linux,rc-map-name: Linux specific remote control map name.



Example node:



	ir: ir-receiver {

		compatible = "gpio-ir-receiver";

		gpios = <&gpio0 19 1>;

		linux,rc-map-name = "rc-rc6-mce";

	};

drivers/media/rc/gpio-ir-recv.c

+52 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 
#include <linux/interrupt.h>

#include <linux/gpio.h>

#include <linux/slab.h>

#include <linux/of_gpio.h>

#include <linux/platform_device.h>

#include <linux/irq.h>

#include <media/rc-core.h>
@@ -30,6 +31,45 @@ struct gpio_rc_dev { 
	bool active_low;

};



#ifdef CONFIG_OF

/*

 * Translate OpenFirmware node properties into platform_data

 */

static int gpio_ir_recv_get_devtree_pdata(struct device *dev,

				  struct gpio_ir_recv_platform_data *pdata)

{

	struct device_node *np = dev->of_node;

	enum of_gpio_flags flags;

	int gpio;



	gpio = of_get_gpio_flags(np, 0, &flags);

	if (gpio < 0) {

		if (gpio != -EPROBE_DEFER)

			dev_err(dev, "Failed to get gpio flags (%d)\n", gpio);

		return gpio;

	}



	pdata->gpio_nr = gpio;

	pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW);

	/* probe() takes care of map_name == NULL or allowed_protos == 0 */

	pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);

	pdata->allowed_protos = 0;



	return 0;

}



static struct of_device_id gpio_ir_recv_of_match[] = {

	{ .compatible = "gpio-ir-receiver", },

	{ },

};

MODULE_DEVICE_TABLE(of, gpio_ir_recv_of_match);



#else /* !CONFIG_OF */



#define gpio_ir_recv_get_devtree_pdata(dev, pdata)	(-ENOSYS)



#endif



static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)

{

	struct gpio_rc_dev *gpio_dev = dev_id;
@@ -66,6 +106,17 @@ static int gpio_ir_recv_probe(struct platform_device *pdev) 
					pdev->dev.platform_data;

	int rc;



	if (pdev->dev.of_node) {

		struct gpio_ir_recv_platform_data *dtpdata =

			devm_kzalloc(&pdev->dev, sizeof(*dtpdata), GFP_KERNEL);

		if (!dtpdata)

			return -ENOMEM;

		rc = gpio_ir_recv_get_devtree_pdata(&pdev->dev, dtpdata);

		if (rc)

			return rc;

		pdata = dtpdata;

	}



	if (!pdata)

		return -EINVAL;
@@ -191,6 +242,7 @@ static struct platform_driver gpio_ir_recv_driver = { 
	.driver = {

		.name   = GPIO_IR_DRIVER_NAME,

		.owner  = THIS_MODULE,

		.of_match_table = of_match_ptr(gpio_ir_recv_of_match),

#ifdef CONFIG_PM

		.pm	= &gpio_ir_recv_pm_ops,

#endif