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>

1 files changed, 69 insertions, 5 deletions

diff --git a/drivers/input/touchscreen/auo-pixcir-ts.c b/drivers/input/touchscreen/auo-pixcir-ts.c
index c0a2483b30cb..dfa6d5463ef7 100644
--- 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,