From 201f3c803544c052aa1bab9e562e0ada4aefe03d Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Wed, 6 Feb 2019 21:55:26 -0800 Subject: 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 Signed-off-by: Dmitry Torokhov --- drivers/input/touchscreen/ili210x.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'drivers/input') 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 #include #include +#include #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"; -- cgit