Input: mms114 - add device tree bindings

Add device tree bindings for mms114 touchscreen.

[Dmitry Torokhov: added #ifdef CONFIG_OF guards]

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 60 insertions, 2 deletions

diff --git a/drivers/input/touchscreen/mms114.c b/drivers/input/touchscreen/mms114.c
index 560cf09d1c5a..3426d2e11a36 100644
--- a/drivers/input/touchscreen/mms114.c
+++ b/drivers/input/touchscreen/mms114.c
@@ -10,6 +10,7 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/delay.h>
+#include <linux/of.h>
 #include <linux/i2c.h>
 #include <linux/i2c/mms114.h>
 #include <linux/input/mt.h>
@@ -360,14 +361,63 @@ static void mms114_input_close(struct input_dev *dev)
         mms114_stop(data);
 }
 
+#ifdef CONFIG_OF
+static struct mms114_platform_data * __devinit mms114_parse_dt(struct device *dev)
+{
+        struct mms114_platform_data *pdata;
+        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;
+        }
+
+        if (of_property_read_u32(np, "x-size", &pdata->x_size)) {
+                dev_err(dev, "failed to get x-size property\n");
+                return NULL;
+        };
+
+        if (of_property_read_u32(np, "y-size", &pdata->y_size)) {
+                dev_err(dev, "failed to get y-size property\n");
+                return NULL;
+        };
+
+        of_property_read_u32(np, "contact-threshold",
+                                &pdata->contact_threshold);
+        of_property_read_u32(np, "moving-threshold",
+                                &pdata->moving_threshold);
+
+        if (of_find_property(np, "x-invert", NULL))
+                pdata->x_invert = true;
+        if (of_find_property(np, "y-invert", NULL))
+                pdata->y_invert = true;
+
+        return pdata;
+}
+#else
+static inline struct mms114_platform_data *mms114_parse_dt(struct device *dev)
+{
+        return NULL;
+}
+#endif
+
 static int __devinit mms114_probe(struct i2c_client *client,
                                   const struct i2c_device_id *id)
 {
+        const struct mms114_platform_data *pdata;
         struct mms114_data *data;
         struct input_dev *input_dev;
         int error;
 
-        if (!client->dev.platform_data) {
+        pdata = dev_get_platdata(&client->dev);
+        if (!pdata)
+                pdata = mms114_parse_dt(&client->dev);
+
+        if (!pdata) {
                 dev_err(&client->dev, "Need platform data\n");
                 return -EINVAL;
         }
@@ -389,7 +439,7 @@ static int __devinit mms114_probe(struct i2c_client *client,
 
         data->client = client;
         data->input_dev = input_dev;
-        data->pdata = client->dev.platform_data;
+        data->pdata = pdata;
 
         input_dev->name = "MELPAS MMS114 Touchscreen";
         input_dev->id.bustype = BUS_I2C;
@@ -525,11 +575,19 @@ static const struct i2c_device_id mms114_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, mms114_id);
 
+#ifdef CONFIG_OF
+static struct of_device_id __devinitdata mms114_dt_match[] = {
+        { .compatible = "melfas,mms114" },
+        { }
+};
+#endif
+
 static struct i2c_driver mms114_driver = {
         .driver = {
                 .name   = "mms114",
                 .owner  = THIS_MODULE,
                 .pm     = &mms114_pm_ops,
+                .of_match_table = of_match_ptr(mms114_dt_match),
         },
         .probe          = mms114_probe,
         .remove         = __devexit_p(mms114_remove),