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authorSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>2013-02-08 18:47:30 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-02-13 17:40:23 -0200
commit2fd7f398d32a0d490d28de75b613263502918e51 (patch)
treeb11b789538b8cdb40db3b69c92d8b7bb8fcee359
parentb940a2219c9d59171339cc4510462154934fcb49 (diff)
[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: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
-rw-r--r--Documentation/devicetree/bindings/media/gpio-ir-receiver.txt16
-rw-r--r--drivers/media/rc/gpio-ir-recv.c52
2 files changed, 68 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/media/gpio-ir-receiver.txt b/Documentation/devicetree/bindings/media/gpio-ir-receiver.txt
new file mode 100644
index 000000000000..56e726ef4bf2
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/gpio-ir-receiver.txt
@@ -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";
+ };
diff --git a/drivers/media/rc/gpio-ir-recv.c b/drivers/media/rc/gpio-ir-recv.c
index 382f362b69af..8b82ae9bd686 100644
--- a/drivers/media/rc/gpio-ir-recv.c
+++ b/drivers/media/rc/gpio-ir-recv.c
@@ -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

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