Input: auo_pixcir_ts - add devicetree support
From: Heiko Stuebner <heiko@...> Date: Sat, 23 Feb 2013 12:42:50 +0100
Commit-Message
Add the necessary code to create the needed platformdata from devicetree informations. The interrupt mode of the chip is not set via devicetree, as it is not a property of the hardware but instead only a preferred type of operation. This should probably be made settable via configfs in the future. The option set as default is the mode the datasheet mentions as default. Signed-off-by: Heiko Stuebner <heiko@...>
Patch-Comment
.../bindings/input/touchscreen/auo_pixcir_ts.txt | 30 ++++++++++ drivers/input/touchscreen/auo-pixcir-ts.c | 59 ++++++++++++++++++++ 2 files changed, 89 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/input/touchscreen/auo_pixcir_ts.txt
Statistics
- 89 lines added
- 0 lines removed
Changes
---- Documentation/devicetree/bindings/input/touchscreen/auo_pixcir_ts.txt -----
new file mode 100644
index 0000000..f40f21c
@@ -0,0 +1,30 @@
+* AUO in-cell touchscreen controller using Pixcir sensors
+
+Required properties:
+- compatible: must be "auo,auo_pixcir_ts"
+- reg: I2C address of the chip
+- interrupts: interrupt to which the chip is connected
+- gpios: gpios the chip is connected to
+ first one is the interrupt gpio and second one the reset gpio
+- x-size: horizontal resolution of touchscreen
+- y-size: vertical resolution of touchscreen
+
+Example:
+
+ i2c@00000000 {
+ /* ... */
+
+ auo_pixcir_ts@5c {
+ compatible = "auo,auo_pixcir_ts";
+ reg = <0x5c>;
+ interrupts = <2 0>;
+
+ gpios = <&gpf 2 0 2>, /* INT */
+ <&gpf 5 1 0>; /* RST */
+
+ x-size = <800>;
+ y-size = <600>;
+ };
+
+ /* ... */
+ };
------------------ drivers/input/touchscreen/auo-pixcir-ts.c -------------------
index c0a2483..6d1f8c1 100644
@@ -31,6 +31,8 @@
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/input/auo-pixcir-ts.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
/*
* Coordinate calculation:
@@ -479,6 +481,51 @@ unlock:
}
#endif
+static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
+{
+ struct auo_pixcir_ts_platdata *pdata = NULL;
+
+#ifdef CONFIG_OF
+ struct device_node *np = dev->of_node;
+
+ if (!np)
+ return NULL;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ dev_err(dev, "failed to allocate platform data\n");
+ return NULL;
+ }
+
+ pdata->gpio_int = of_get_gpio(np, 0);
+ if (!gpio_is_valid(pdata->gpio_int)) {
+ dev_err(dev, "failed to get interrupt gpio\n");
+ return NULL;
+ }
+
+ pdata->gpio_rst = of_get_gpio(np, 1);
+ if (!gpio_is_valid(pdata->gpio_rst)) {
+ dev_err(dev, "failed to get reset gpio\n");
+ return NULL;
+ }
+
+ if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
+ dev_err(dev, "failed to get x-size property\n");
+ return NULL;
+ };
+
+ if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
+ dev_err(dev, "failed to get y-size property\n");
+ return NULL;
+ };
+
+ /* default to asserting the interrupt when the screen is touched */
+ pdata->int_setting = AUO_PIXCIR_INT_TOUCH_IND;
+#endif
+
+ return pdata;
+}
+
static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops, auo_pixcir_suspend,
auo_pixcir_resume);
@@ -491,6 +538,9 @@ static int auo_pixcir_probe(struct i2c_client *client,
int ret;
if (!pdata)
+ pdata = auo_pixcir_parse_dt(&client->dev);
+
+ if (!pdata)
return -EINVAL;
ts = kzalloc(sizeof(struct auo_pixcir_ts), GFP_KERNEL);
@@ -647,11 +697,20 @@ static const struct i2c_device_id auo_pixcir_idtable[] = {
};
MODULE_DEVICE_TABLE(i2c, auo_pixcir_idtable);
+#ifdef CONFIG_OF
+static struct of_device_id auo_pixcir_ts_dt_idtable[] = {
+ { .compatible = "auo,auo_pixcir_ts" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, auo_pixcir_ts_dt_idtable);
+#endif
+
static struct i2c_driver auo_pixcir_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "auo_pixcir_ts",
.pm = &auo_pixcir_pm_ops,
+ .of_match_table = of_match_ptr(auo_pixcir_ts_dt_idtable),
},
.probe = auo_pixcir_probe,
.remove = auo_pixcir_remove,