diff options
| author | Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> | 2013-02-08 22:47:30 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-02-13 20:40:23 +0100 |
| commit | 2fd7f398d32a0d490d28de75b613263502918e51 (patch) | |
| tree | b11b789538b8cdb40db3b69c92d8b7bb8fcee359 /drivers/media | |
| parent | [media] mceusb: move check earlier to make smatch happy (diff) | |
| download | linux-2fd7f398d32a0d490d28de75b613263502918e51.tar.xz linux-2fd7f398d32a0d490d28de75b613263502918e51.zip | |
[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>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/rc/gpio-ir-recv.c | 52 |
1 files changed, 52 insertions, 0 deletions
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 |