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* [PATCH] input: touchscreen: mms114: Add device tree bindings
@ 2012-10-02  9:33 Tomasz Figa
  2012-10-04  1:21 ` Joonyoung Shim
  0 siblings, 1 reply; 2+ messages in thread
From: Tomasz Figa @ 2012-10-02  9:33 UTC (permalink / raw)
  To: linux-input
  Cc: linux-samsung-soc, devicetree-discuss, kyungmin.park,
	m.szyprowski, t.figa, jy0922.shim, tomasz.figa

This patch adds device tree bindings for mms114 touchscreen.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>

---
 .../bindings/input/touchscreen/mms114.txt          | 34 ++++++++++++++
 drivers/input/touchscreen/mms114.c                 | 52 +++++++++++++++++++++-
 2 files changed, 84 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/mms114.txt

diff --git a/Documentation/devicetree/bindings/input/touchscreen/mms114.txt b/Documentation/devicetree/bindings/input/touchscreen/mms114.txt
new file mode 100644
index 0000000..f89d382
--- /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 49c44bb..fb66f7a 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 +361,55 @@ static void mms114_input_close(struct input_dev *dev)
 	mms114_stop(data);
 }
 
+static struct mms114_platform_data *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;
+}
+
 static int __devinit mms114_probe(struct i2c_client *client,
 				  const struct i2c_device_id *id)
 {
 	struct mms114_data *data;
 	struct input_dev *input_dev;
+	struct mms114_platform_data *pdata = client->dev.platform_data;
 	int error;
 
-	if (!client->dev.platform_data) {
+	if (!pdata)
+		pdata = mms114_parse_dt(&client->dev);
+
+	if (!pdata) {
 		dev_err(&client->dev, "Need platform data\n");
 		return -EINVAL;
 	}
@@ -389,7 +431,7 @@ 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 +567,17 @@ static const struct i2c_device_id mms114_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, mms114_id);
 
+static struct of_device_id __devinitdata mms114_dt_match[] = {
+	{ .compatible = "melfas,mms114" },
+	{ }
+};
+
 static struct i2c_driver mms114_driver = {
 	.driver = {
 		.name	= "mms114",
 		.owner	= THIS_MODULE,
 		.pm	= &mms114_pm_ops,
+		.of_match_table = mms114_dt_match,
 	},
 	.probe		= mms114_probe,
 	.remove		= __devexit_p(mms114_remove),
-- 
1.7.12

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2012-10-02  9:33 [PATCH] input: touchscreen: mms114: Add device tree bindings Tomasz Figa
2012-10-04  1:21 ` Joonyoung Shim

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