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Date: Fri, 8 Feb 2013 23:47:30 +0100
From: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc: Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <rob.herring@...xeda.com>,
Rob Landley <rob@...dley.net>,
Mauro Carvalho Chehab <mchehab@...hat.com>,
Benoit Thebaudeau <benoit.thebaudeau@...ansee.com>,
David Hardeman <david@...deman.nu>,
Trilok Soni <tsoni@...eaurora.org>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Matus Ujhelyi <ujhelyi.m@...il.com>,
devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: [PATCH v3] 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@...il.com>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
---
There was a similar patch sent by Matus Ujhelyi but that discussion
died after the first reviews.
Changelog
v1->v2:
- get rid of ptr returned by _get_devtree_pdata()
- check for of_node instead for NULL pdata
- remove unneccessary double check for gpios property
- remove unneccessary #ifdef CONFIG_OF around match table
v2->v3:
- use define for !OF_CONFIG _get_devtree_pdata()
- simplify flags test and of_get_gpio_flags error msg
- fix some typos in binding documentation
- move note about previous patch submission to non-commit area
Cc: Grant Likely <grant.likely@...retlab.ca>
Cc: Rob Herring <rob.herring@...xeda.com>
Cc: Rob Landley <rob@...dley.net>
Cc: Mauro Carvalho Chehab <mchehab@...hat.com>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc: Benoit Thebaudeau <benoit.thebaudeau@...ansee.com>
Cc: David Hardeman <david@...deman.nu>
Cc: Trilok Soni <tsoni@...eaurora.org>
Cc: Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc: Matus Ujhelyi <ujhelyi.m@...il.com>
Cc: devicetree-discuss@...ts.ozlabs.org
Cc: linux-doc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-media@...r.kernel.org
---
.../devicetree/bindings/media/gpio-ir-receiver.txt | 16 ++++++
drivers/media/rc/gpio-ir-recv.c | 52 ++++++++++++++++++++
2 files changed, 68 insertions(+)
create mode 100644 Documentation/devicetree/bindings/media/gpio-ir-receiver.txt
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 0000000..56e726e
--- /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 4f71a7d..b5cfb44 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;
@@ -192,6 +243,7 @@ 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
--
1.7.10.4
--
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