Input: auo_pixcir_ts - add devicetree support

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@sntech.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/Documentation/devicetree/bindings/input/touchscreen/auo_pixcir_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/auo_pixcir_ts.txt
new file mode 100644 (file)
index 0000000..f40f21c
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/auo_pixcir_ts.txt
@@ -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>;
+               };
+
+               /* ... */
+       };

diff --git a/drivers/input/touchscreen/auo-pixcir-ts.c b/drivers/input/touchscreen/auo-pixcir-ts.c
index c0a2483..dfa6d54 100644 (file)
--- a/drivers/input/touchscreen/auo-pixcir-ts.c
+++ b/drivers/input/touchscreen/auo-pixcir-ts.c
@@ -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:
@@ -479,19 +481,72 @@ unlock:
 }
 #endif
 
-static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops, auo_pixcir_suspend,
-                        auo_pixcir_resume);
+static SIMPLE_DEV_PM_OPS(auo_pixcir_pm_ops,
+                        auo_pixcir_suspend, auo_pixcir_resume);
+
+#ifdef CONFIG_OF
+static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
+{
+       struct auo_pixcir_ts_platdata *pdata;
+       struct device_node *np = dev->of_node;
+
+       if (!np)
+               return ERR_PTR(-ENOENT);
+
+       pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+       if (!pdata) {
+               dev_err(dev, "failed to allocate platform data\n");
+               return ERR_PTR(-ENOMEM);
+       }
+
+       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 ERR_PTR(-EINVAL);
+       }
+
+       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 ERR_PTR(-EINVAL);
+       }
+
+       if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
+               dev_err(dev, "failed to get x-size property\n");
+               return ERR_PTR(-EINVAL);
+       }
+
+       if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
+               dev_err(dev, "failed to get y-size property\n");
+               return ERR_PTR(-EINVAL);
+       }
+
+       /* default to asserting the interrupt when the screen is touched */
+       pdata->int_setting = AUO_PIXCIR_INT_TOUCH_IND;
+
+       return pdata;
+}
+#else
+static struct auo_pixcir_ts_platdata *auo_pixcir_parse_dt(struct device *dev)
+{
+       return ERR_PTR(-EINVAL);
+}
+#endif
 
 static int auo_pixcir_probe(struct i2c_client *client,
                                      const struct i2c_device_id *id)
 {
-       const struct auo_pixcir_ts_platdata *pdata = client->dev.platform_data;
+       const struct auo_pixcir_ts_platdata *pdata;
        struct auo_pixcir_ts *ts;
        struct input_dev *input_dev;
        int ret;
 
-       if (!pdata)
-               return -EINVAL;
+       pdata = dev_get_platdata(&client->dev);
+       if (!pdata) {
+               pdata = auo_pixcir_parse_dt(&client->dev);
+               if (IS_ERR(pdata))
+                       return PTR_ERR(pdata);
+       }
 
        ts = kzalloc(sizeof(struct auo_pixcir_ts), GFP_KERNEL);
        if (!ts)
@@ -647,11 +702,20 @@ 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,