Author: Lee Jones <lee.jones@xxxxxxxxxx>
Date: Fri Sep 28 14:35:43 2012 +0100
Input: bu21013_ts - Add support for Device Tree booting
Now we can register the BU21013_ts touch screen when booting with
Device Tree enabled. Here we parse all the necessary components
previously expected to be passed from platform data.
Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
Cc: linux-input@xxxxxxxxxxxxxxx
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
diff --git a/Documentation/devicetree/bindings/input/touchscreen/bu21013.txt b/Documentation/devicetree/bindings/input/touchscreen/bu21013.txt
new file mode 100644
index 0000000..ca5a2c8
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/bu21013.txt
@@ -0,0 +1,28 @@
+* Rohm BU21013 Touch Screen
+
+Required properties:
+ - compatible : "rohm,bu21013_tp"
+ - reg : I2C device address
+
+Optional properties:
+ - touch-gpio : GPIO pin registering a touch event
+ - <supply_name>-supply : Phandle to a regulator supply
+ - rohm,touch-max-x : Maximum outward permitted limit in the X axis
+ - rohm,touch-max-y : Maximum outward permitted limit in the Y axis
+ - rohm,flip-x : Flip touch coordinates on the X axis
+ - rohm,flip-y : Flip touch coordinates on the Y axis
+
+Example:
+
+ i2c@80110000 {
+ bu21013_tp@0x5c {
+ compatible = "rohm,bu21013_tp";
+ reg = <0x5c>;
+ touch-gpio = <&gpio2 20 0x4>;
+ avdd-supply = <&ab8500_ldo_aux1_reg>;
+
+ rohm,touch-max-x = <384>;
+ rohm,touch-max-y = <704>;
+ rohm,flip-y;
+ };
+ };
diff --git a/drivers/input/touchscreen/bu21013_ts.c b/drivers/input/touchscreen/bu21013_ts.c
index 16f29d6..07335ac 100644
--- a/drivers/input/touchscreen/bu21013_ts.c
+++ b/drivers/input/touchscreen/bu21013_ts.c
@@ -15,6 +15,8 @@
#include <linux/regulator/consumer.h>
#include <linux/module.h>
#include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
#define PEN_DOWN_INTR 0
#define MAX_FINGERS 2
@@ -473,13 +475,30 @@ static void bu21013_free_irq(struct bu21013_ts_data *bu21013_data)
* This function used to initializes the i2c-client touchscreen
* driver and returns integer.
*/
+static void __devinit bu21013_of_probe(struct device_node *np,
+ struct bu21013_platform_device *pdata)
+{
+ pdata->y_flip = pdata->x_flip = false;
+
+ pdata->x_flip = of_property_read_bool(np, "rohm,flip-x");
+ pdata->y_flip = of_property_read_bool(np, "rohm,flip-y");
+
+ of_property_read_u32(np, "rohm,touch-max-x", &pdata->touch_x_max);
+ of_property_read_u32(np, "rohm,touch-max-y", &pdata->touch_y_max);
+
+ pdata->touch_pin = of_get_named_gpio(np, "touch-gpio", 0);
+ pdata->cs_pin = of_get_named_gpio(np, "reset-gpio", 0);
+
+ pdata->ext_clk = false;
+}
+
static int __devinit bu21013_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct bu21013_ts_data *bu21013_data;
struct input_dev *in_dev;
- const struct bu21013_platform_device *pdata =
- client->dev.platform_data;
+ struct device_node *np = client->dev.of_node;
+ struct bu21013_platform_device *pdata = client->dev.platform_data;
int error;
if (!i2c_check_functionality(client->adapter,
@@ -489,8 +508,17 @@ static int __devinit bu21013_probe(struct i2c_client *client,
}
if (!pdata) {
- dev_err(&client->dev, "platform data not defined\n");
- return -EINVAL;
+ if (np) {
+ pdata = devm_kzalloc(&client->dev, sizeof(*pdata),
+ GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ bu21013_of_probe(np, pdata);
+ } else {
+ dev_err(&client->dev, "no device tree or platform data\n");
+ return -EINVAL;
+ }
}
pdata->irq = gpio_to_irq(pdata->touch_pin);
--
Lee Jones
Linaro ST-Ericsson Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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