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Message-Id: <1359400023-25804-1-git-send-email-sebastian.hesselbarth@gmail.com>
Date: Mon, 28 Jan 2013 20:07:03 +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>,
devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: [PATCH] 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 optional properties allow linux specific support for rc
protocols and maps.
There was a similar patch sent by Matus Ujhelyi but that discussion
died after the first reviews.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
---
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: 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 | 20 ++++++
drivers/media/rc/gpio-ir-recv.c | 68 +++++++++++++++++++-
2 files changed, 86 insertions(+), 2 deletions(-)
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..937760c
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/gpio-ir-receiver.txt
@@ -0,0 +1,20 @@
+Device-Tree bindings for GPIO IR receiver
+
+Required properties:
+ - compatible = "gpio-ir-receiver";
+ - gpios: OF device-tree gpio specification.
+
+Optional properties:
+ - linux,allowed-rc-protocols: Linux specific u64 bitmask of allowed
+ rc protocols.
+ - linux,rc-map-name: Linux specific remote control map name.
+
+Example node:
+
+ ir: ir-receiver {
+ compatible = "gpio-ir-receiver";
+ gpios = <&gpio0 19 1>;
+ /* allow rc protocols 1-4 */
+ linux,allowed-rc-protocols = <0x00000000 0x0000001e>;
+ 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..25e09fa 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 +31,63 @@ struct gpio_rc_dev {
bool active_low;
};
+#ifdef CONFIG_OF
+/*
+ * Translate OpenFirmware node properties into platform_data
+ */
+static struct gpio_ir_recv_platform_data *
+gpio_ir_recv_get_devtree_pdata(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct gpio_ir_recv_platform_data *pdata;
+ enum of_gpio_flags flags;
+ int gpio;
+
+ if (!np)
+ return ERR_PTR(-ENODEV);
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ if (!of_find_property(np, "gpios", NULL)) {
+ dev_err(dev, "Found gpio-ir-receiver without gpios\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ gpio = of_get_gpio_flags(np, 0, &flags);
+ if (gpio < 0) {
+ if (gpio != -EPROBE_DEFER)
+ dev_err(dev, "Failed to get gpio flags, error: %d\n",
+ gpio);
+ return ERR_PTR(gpio);
+ }
+
+ pdata->gpio_nr = gpio;
+ pdata->active_low = (flags & OF_GPIO_ACTIVE_LOW) ? true : false;
+ pdata->map_name = of_get_property(np, "linux,rc-map-name", NULL);
+ of_property_read_u64(np, "linux,allowed-rc-protocols",
+ &pdata->allowed_protos);
+
+ return pdata;
+}
+
+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 */
+
+static inline struct gpio_ir_recv_platform_data *
+gpio_ir_recv_get_devtree_pdata(struct device *dev)
+{
+ return ERR_PTR(-ENODEV);
+}
+
+#endif
+
static irqreturn_t gpio_ir_recv_irq(int irq, void *dev_id)
{
struct gpio_rc_dev *gpio_dev = dev_id;
@@ -66,8 +124,11 @@ static int gpio_ir_recv_probe(struct platform_device *pdev)
pdev->dev.platform_data;
int rc;
- if (!pdata)
- return -EINVAL;
+ if (!pdata) {
+ pdata = gpio_ir_recv_get_devtree_pdata(&pdev->dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ }
if (pdata->gpio_nr < 0)
return -EINVAL;
@@ -195,6 +256,9 @@ static struct platform_driver gpio_ir_recv_driver = {
#ifdef CONFIG_PM
.pm = &gpio_ir_recv_pm_ops,
#endif
+#ifdef CONFIG_OF
+ .of_match_table = of_match_ptr(gpio_ir_recv_of_match),
+#endif
},
};
module_platform_driver(gpio_ir_recv_driver);
--
1.7.10.4
--
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