Commit 6f2e6c9b authored by Heiko Stübner's avatar Heiko Stübner Committed by Dmitry Torokhov

Input: zforce - add devicetree support

This makes the zforce driver usable on devicetree-based platforms too.
Signed-off-by: default avatarHeiko Stuebner <heiko.stuebner@bqreaders.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 87273364
* Neonode infrared touchscreen controller
Required properties:
- compatible: must be "neonode,zforce"
- reg: I2C address of the chip
- interrupts: interrupt to which the chip is connected
- gpios: gpios the chip is connected to
first one is the interrupt gpio and second one the reset gpio
- x-size: horizontal resolution of touchscreen
- y-size: vertical resolution of touchscreen
Example:
i2c@00000000 {
/* ... */
zforce_ts@50 {
compatible = "neonode,zforce";
reg = <0x50>;
interrupts = <2 0>;
gpios = <&gpio5 6 0>, /* INT */
<&gpio5 9 0>; /* RST */
x-size = <800>;
y-size = <600>;
};
/* ... */
};
......@@ -29,6 +29,8 @@
#include <linux/sysfs.h>
#include <linux/input/mt.h>
#include <linux/platform_data/zforce_ts.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#define WAIT_TIMEOUT msecs_to_jiffies(1000)
......@@ -681,6 +683,45 @@ static void zforce_reset(void *data)
gpio_set_value(ts->pdata->gpio_rst, 0);
}
static struct zforce_ts_platdata *zforce_parse_dt(struct device *dev)
{
struct zforce_ts_platdata *pdata;
struct device_node *np = dev->of_node;
if (!np)
return ERR_PTR(-ENOENT);
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata) {
dev_err(dev, "failed to allocate platform data\n");
return ERR_PTR(-ENOMEM);
}
pdata->gpio_int = of_get_gpio(np, 0);
if (!gpio_is_valid(pdata->gpio_int)) {
dev_err(dev, "failed to get interrupt gpio\n");
return ERR_PTR(-EINVAL);
}
pdata->gpio_rst = of_get_gpio(np, 1);
if (!gpio_is_valid(pdata->gpio_rst)) {
dev_err(dev, "failed to get reset gpio\n");
return ERR_PTR(-EINVAL);
}
if (of_property_read_u32(np, "x-size", &pdata->x_max)) {
dev_err(dev, "failed to get x-size property\n");
return ERR_PTR(-EINVAL);
}
if (of_property_read_u32(np, "y-size", &pdata->y_max)) {
dev_err(dev, "failed to get y-size property\n");
return ERR_PTR(-EINVAL);
}
return pdata;
}
static int zforce_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
......@@ -689,8 +730,11 @@ static int zforce_probe(struct i2c_client *client,
struct input_dev *input_dev;
int ret;
if (!pdata)
return -EINVAL;
if (!pdata) {
pdata = zforce_parse_dt(&client->dev);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
}
ts = devm_kzalloc(&client->dev, sizeof(struct zforce_ts), GFP_KERNEL);
if (!ts)
......@@ -826,11 +870,20 @@ static struct i2c_device_id zforce_idtable[] = {
};
MODULE_DEVICE_TABLE(i2c, zforce_idtable);
#ifdef CONFIG_OF
static struct of_device_id zforce_dt_idtable[] = {
{ .compatible = "neonode,zforce" },
{},
};
MODULE_DEVICE_TABLE(of, zforce_dt_idtable);
#endif
static struct i2c_driver zforce_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "zforce-ts",
.pm = &zforce_pm_ops,
.of_match_table = of_match_ptr(zforce_dt_idtable),
},
.probe = zforce_probe,
.id_table = zforce_idtable,
......
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