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Input: ili210x - add reset GPIO support

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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>
This commit is contained in:
Marek Vasut 2019-02-06 21:55:26 -08:00 committed by Dmitry Torokhov
parent 63083fd582
commit 201f3c8035
1 changed files with 26 additions and 0 deletions
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26
drivers/input/touchscreen/ili210x.c
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@ -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";