Provide device tree support and binding information.
Change platform data parameters from x/y_max to x/y_size..
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Acked-by: Mugunthan V N <mugunthanvnm@xxxxxx>
---
.../bindings/input/touchscreen/pixcir_i2c_ts.txt | 26 ++++++++
drivers/input/touchscreen/pixcir_i2c_ts.c | 77 ++++++++++++++++++++--
include/linux/input/pixcir_ts.h | 5 +-
3 files changed, 101 insertions(+), 7 deletions(-)
create mode 100644 Documentation/devicetree/bindings/input/touchscreen/pixcir_i2c_ts.txt
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 0000000..c0b0b270
--- /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"
+- 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
+- x-size: horizontal resolution of touchscreen
+- y-size: vertical resolution of touchscreen
+
+Example:
+
+ i2c@00000000 {
+ /* ... */
+
+ pixcir_ts@5c {
+ compatible = "pixcir,pixcir_ts";
+ reg = <0x5c>;
+ interrupts = <2 0>;
+ attb-gpio = <&gpf 2 0 2>;
+ x-size = <800>;
+ y-size = <600>;
+ };
+
+ /* ... */
+ };
diff --git a/drivers/input/touchscreen/pixcir_i2c_ts.c b/drivers/input/touchscreen/pixcir_i2c_ts.c
index 6cc6b36..3a447c9 100644
--- a/drivers/input/touchscreen/pixcir_i2c_ts.c
+++ b/drivers/input/touchscreen/pixcir_i2c_ts.c
@@ -24,6 +24,10 @@
#include <linux/i2c.h>
#include <linux/input.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>
struct pixcir_i2c_ts_data {
struct i2c_client *client;
@@ -125,15 +129,65 @@ static int pixcir_i2c_ts_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
+#if defined(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->gpio_attb = of_get_named_gpio(np, "attb-gpio", 0);
+ if (!gpio_is_valid(pdata->gpio_attb))
+ dev_err(dev, "Failed to get ATTB GPIO\n");
+
+ if (of_property_read_u32(np, "x-size", &pdata->x_size)) {
+ dev_err(dev, "Failed to get x-size property\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (of_property_read_u32(np, "y-size", &pdata->y_size)) {
+ dev_err(dev, "Failed to get y-size property\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ dev_dbg(dev, "%s: x %d, y %d, gpio %d\n", __func__,
+ pdata->x_size, pdata->y_size, pdata->gpio_attb);
+
+ return pdata;
+}
+#else
+static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
+{
+ return NULL;
+}
+#endif
+
static int pixcir_i2c_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
const struct pixcir_ts_platform_data *pdata = client->dev.platform_data;
+ 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 (!pdata) {
+ if (np) {
+ pdata = pixcir_parse_dt(dev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+
+ } else if (!pdata) {
dev_err(&client->dev, "platform data not defined\n");
return -EINVAL;
}
@@ -157,10 +211,14 @@ static int pixcir_i2c_ts_probe(struct i2c_client *client,
__set_bit(EV_KEY, input->evbit);
__set_bit(EV_ABS, input->evbit);
__set_bit(BTN_TOUCH, input->keybit);
- input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
- input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
- input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
- input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
+ input_set_abs_params(input, ABS_X,
+ 0, pdata->x_size - 1, 0, 0);
+ input_set_abs_params(input, ABS_Y,
+ 0, pdata->y_size - 1, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_X,
+ 0, pdata->x_size - 1, 0, 0);
+ input_set_abs_params(input, ABS_MT_POSITION_Y,
+ 0, pdata->y_size - 1, 0, 0);
input_set_drvdata(input, tsdata);
@@ -211,11 +269,20 @@ static const struct i2c_device_id pixcir_i2c_ts_id[] = {
};
MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
+#if defined(CONFIG_OF)
+static const struct of_device_id pixcir_of_match[] = {
+ { .compatible = "pixcir,pixcir_ts", },
+ { }
+};
+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,
diff --git a/include/linux/input/pixcir_ts.h b/include/linux/input/pixcir_ts.h
index 7163d91..b34ff7e 100644
--- a/include/linux/input/pixcir_ts.h
+++ b/include/linux/input/pixcir_ts.h
@@ -3,8 +3,9 @@
struct pixcir_ts_platform_data {
int (*attb_read_val)(void);
- int x_max;
- int y_max;
+ unsigned int x_size; /* X axis resolution */
+ unsigned int y_size; /* Y axis resolution */
+ int gpio_attb; /* GPIO connected to ATTB line */
};
#endif
--
1.8.3.2
--
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