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authorMarek Vasut <marex@denx.de>2019-02-07 08:55:26 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2019-02-07 09:17:46 +0300
commit201f3c803544c052aa1bab9e562e0ada4aefe03d (patch)
tree2da7a2a8795b0e78ef7e622783aa7aaac9bddbbc /drivers/input/touchscreen
parent63083fd582b9eb46a67fff6d4077a931d986d066 (diff)
downloadlinux-201f3c803544c052aa1bab9e562e0ada4aefe03d.tar.xz
Input: ili210x - add reset GPIO support
The touchscreen can have a reset GPIO connected to it, add support for such an arrangement. Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/touchscreen')
-rw-r--r--drivers/input/touchscreen/ili210x.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c
index 788f4140e302..f8b20d302384 100644
--- a/drivers/input/touchscreen/ili210x.c
+++ b/drivers/input/touchscreen/ili210x.c
@@ -6,6 +6,7 @@
#include <linux/input/mt.h>
#include <linux/delay.h>
#include <linux/workqueue.h>
+#include <linux/gpio/consumer.h>
#define MAX_TOUCHES 2
#define DEFAULT_POLL_PERIOD 20
@@ -45,6 +46,7 @@ struct ili210x {
struct input_dev *input;
unsigned int poll_period;
struct delayed_work dwork;
+ struct gpio_desc *reset_gpio;
};
static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
@@ -168,11 +170,19 @@ static const struct attribute_group ili210x_attr_group = {
.attrs = ili210x_attributes,
};
+static void ili210x_power_down(void *data)
+{
+ struct gpio_desc *reset_gpio = data;
+
+ gpiod_set_value_cansleep(reset_gpio, 1);
+}
+
static int ili210x_i2c_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct device *dev = &client->dev;
struct ili210x *priv;
+ struct gpio_desc *reset_gpio;
struct input_dev *input;
struct panel_info panel;
struct firmware_version firmware;
@@ -186,6 +196,21 @@ static int ili210x_i2c_probe(struct i2c_client *client,
return -EINVAL;
}
+ reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(reset_gpio))
+ return PTR_ERR(reset_gpio);
+
+ if (reset_gpio) {
+ error = devm_add_action_or_reset(dev, ili210x_power_down,
+ reset_gpio);
+ if (error)
+ return error;
+
+ usleep_range(50, 100);
+ gpiod_set_value_cansleep(reset_gpio, 0);
+ msleep(100);
+ }
+
/* Get firmware version */
error = ili210x_read_reg(client, REG_FIRMWARE_VERSION,
&firmware, sizeof(firmware));
@@ -218,6 +243,7 @@ static int ili210x_i2c_probe(struct i2c_client *client,
priv->input = input;
priv->poll_period = DEFAULT_POLL_PERIOD;
INIT_DELAYED_WORK(&priv->dwork, ili210x_work);
+ priv->reset_gpio = reset_gpio;
/* Setup input device */
input->name = "ILI210x Touchscreen";