Input: pixcir_i2c_ts - add device tree support

Provide device tree support and binding information.  Also provide support
for a new chip "pixcir_tangoc".

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

3 files changed, 104 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
new file mode 100644
index 000000000000..6e551090f465
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
@@ -0,0 +1,26 @@
+* Pixcir I2C touchscreen controllers
+
+Required properties:
+- compatible: must be "pixcir,pixcir_ts" or "pixcir,pixcir_tangoc"
+- reg: I2C address of the chip
+- interrupts: interrupt to which the chip is connected
+- attb-gpio: GPIO connected to the ATTB line of the chip
+- touchscreen-size-x: horizontal resolution of touchscreen (in pixels)
+- touchscreen-size-y: vertical resolution of touchscreen (in pixels)
+
+Example:
+
+        i2c@00000000 {
+                /* ... */
+
+                pixcir_ts@5c {
+                        compatible = "pixcir,pixcir_ts";
+                        reg = <0x5c>;
+                        interrupts = <2 0>;
+                        attb-gpio = <&gpf 2 0 2>;
+                        touchscreen-size-x = <800>;
+                        touchscreen-size-y = <600>;
+                };
+
+                /* ... */
+        };
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 46a311e728a8..91bd2287f0c7 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt
@@ -99,6 +99,7 @@ panasonic	Panasonic Corporation
 phytec  PHYTEC Messtechnik GmbH
 picochip        Picochip Ltd
 plathome        Plat'Home Co., Ltd.
+pixcir  PIXCIR MICROELECTRONICS Co., Ltd
 powervr PowerVR (deprecated, use img)
 qca     Qualcomm Atheros, Inc.
 qcom    Qualcomm Technologies, Inc
diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
index eddda520a1a7..fc49c75317d1 100644
--- a/drivers/input/touchscreen/pixcir_i2c_ts.c
+++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
@@ -26,6 +26,9 @@
 #include <linux/input/mt.h>
 #include <linux/input/pixcir_ts.h>
 #include <linux/gpio.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_device.h>
 
 #define PIXCIR_MAX_SLOTS       5 /* Max fingers supported by driver */
 
@@ -407,16 +410,69 @@ unlock:
 static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
                          pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
 
+#ifdef CONFIG_OF
+static const struct of_device_id pixcir_of_match[];
+
+static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
+{
+        struct pixcir_ts_platform_data *pdata;
+        struct device_node *np = dev->of_node;
+        const struct of_device_id *match;
+
+        match = of_match_device(of_match_ptr(pixcir_of_match), dev);
+        if (!match)
+                return ERR_PTR(-EINVAL);
+
+        pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+        if (!pdata)
+                return ERR_PTR(-ENOMEM);
+
+        pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;
+
+        pdata->gpio_attb = of_get_named_gpio(np, "attb-gpio", 0);
+        /* gpio_attb validity is checked in probe */
+
+        if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
+                dev_err(dev, "Failed to get touchscreen-size-x property\n");
+                return ERR_PTR(-EINVAL);
+        }
+        pdata->x_max -= 1;
+
+        if (of_property_read_u32(np, "touchscreen-size-y", &pdata->y_max)) {
+                dev_err(dev, "Failed to get touchscreen-size-y property\n");
+                return ERR_PTR(-EINVAL);
+        }
+        pdata->y_max -= 1;
+
+        dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
+                pdata->x_max + 1, pdata->y_max + 1, pdata->gpio_attb);
+
+        return pdata;
+}
+#else
+static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
+{
+        return ERR_PTR(-EINVAL);
+}
+#endif
+
 static int pixcir_i2c_ts_probe(struct i2c_client *client,
                                          const struct i2c_device_id *id)
 {
         const struct pixcir_ts_platform_data *pdata =
                         dev_get_platdata(&client->dev);
         struct device *dev = &client->dev;
+        struct device_node *np = dev->of_node;
         struct pixcir_i2c_ts_data *tsdata;
         struct input_dev *input;
         int error;
 
+        if (np && !pdata) {
+                pdata = pixcir_parse_dt(dev);
+                if (IS_ERR(pdata))
+                        return PTR_ERR(pdata);
+        }
+
         if (!pdata) {
                 dev_err(&client->dev, "platform data not defined\n");
                 return -EINVAL;
@@ -522,15 +578,36 @@ static int pixcir_i2c_ts_remove(struct i2c_client *client)
 
 static const struct i2c_device_id pixcir_i2c_ts_id[] = {
         { "pixcir_ts", 0 },
+        { "pixcir_tangoc", 0 },
         { }
 };
 MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
 
+#ifdef CONFIG_OF
+static const struct pixcir_i2c_chip_data pixcir_ts_data = {
+        .max_fingers = 2,
+        /* no hw id support */
+};
+
+static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
+        .max_fingers = 5,
+        .has_hw_ids = true,
+};
+
+static const struct of_device_id pixcir_of_match[] = {
+        { .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
+        { .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
+        { }
+};
+MODULE_DEVICE_TABLE(of, pixcir_of_match);
+#endif
+
 static struct i2c_driver pixcir_i2c_ts_driver = {
         .driver = {
                 .owner  = THIS_MODULE,
                 .name   = "pixcir_ts",
                 .pm     = &pixcir_dev_pm_ops,
+                .of_match_table = of_match_ptr(pixcir_of_match),
         },
         .probe          = pixcir_i2c_ts_probe,
         .remove         = pixcir_i2c_ts_remove,