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>

diff --git a/Documentation/devicetree/bindings/input/touchscreen/mms114.txt b/Documentation/devicetree/bindings/input/touchscreen/mms114.txt
new file mode 100644 (file)
index 0000000..89d4c56
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/mms114.txt
@@ -0,0 +1,34 @@
+* MELFAS MMS114 touchscreen controller
+
+Required properties:
+- compatible: must be "melfas,mms114"
+- reg: I2C address of the chip
+- interrupts: interrupt to which the chip is connected
+- x-size: horizontal resolution of touchscreen
+- y-size: vertical resolution of touchscreen
+
+Optional properties:
+- contact-threshold:
+- moving-threshold:
+- x-invert: invert X axis
+- y-invert: invert Y axis
+
+Example:
+
+       i2c@00000000 {
+               /* ... */
+
+               touchscreen@48 {
+                       compatible = "melfas,mms114";
+                       reg = <0x48>;
+                       interrupts = <39 0>;
+                       x-size = <720>;
+                       y-size = <1280>;
+                       contact-threshold = <10>;
+                       moving-threshold = <10>;
+                       x-invert;
+                       y-invert;
+               };
+
+               /* ... */
+       };

diff --git a/drivers/input/touchscreen/mms114.c b/drivers/input/touchscreen/mms114.c
index 560cf09..3426d2e 100644 (file)
--- 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),