diff options
| author | Marek Vasut <marex@denx.de> | 2019-02-06 21:55:26 -0800 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2019-02-06 22:17:46 -0800 |
| commit | 201f3c803544c052aa1bab9e562e0ada4aefe03d (patch) | |
| tree | 2da7a2a8795b0e78ef7e622783aa7aaac9bddbbc /drivers/input/touchscreen/ili210x.c | |
| parent | 63083fd582b9eb46a67fff6d4077a931d986d066 (diff) | |
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/ili210x.c')
| -rw-r--r-- | drivers/input/touchscreen/ili210x.c | 26 |
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"; |