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[media] media: rc: gpio-ir-recv: add support for device tree parsing

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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: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Sebastian Hesselbarth 2013-02-08 18:47:30 -03:00 committed by Mauro Carvalho Chehab
parent b940a2219c
commit 2fd7f398d3
2 changed files with 68 additions and 0 deletions
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16
Documentation/devicetree/bindings/media/gpio-ir-receiver.txt Normal file
View File

@ -0,0 +1,16 @@
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";
};

52
drivers/media/rc/gpio-ir-recv.c
View File

@ -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