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Input: exc3000 - add reset gpio support

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Add basic support for an optional reset gpio.

Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20200805160520.456570-4-sebastian.reichel@collabora.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Sebastian Reichel 2020-08-06 16:06:36 -07:00 committed by Dmitry Torokhov
parent 3bdd21c693
commit 27aced19e0
2 changed files with 19 additions and 0 deletions
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2
Documentation/devicetree/bindings/input/touchscreen/eeti,exc3000.yaml
View File

@ -22,6 +22,8 @@ properties:
const: 0x2a
interrupts:
maxItems: 1
reset-gpios:
maxItems: 1
touchscreen-size-x: true
touchscreen-size-y: true
touchscreen-inverted-x: true

17
drivers/input/touchscreen/exc3000.c
View File

@ -8,7 +8,9 @@
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/mt.h>
@ -30,6 +32,9 @@
#define EXC3000_TIMEOUT_MS 100
#define EXC3000_RESET_MS 10
#define EXC3000_READY_MS 100
static const struct i2c_device_id exc3000_id[];
struct eeti_dev_info {
@ -63,6 +68,7 @@ struct exc3000_data {
const struct eeti_dev_info *info;
struct input_dev *input;
struct touchscreen_properties prop;
struct gpio_desc *reset;
struct timer_list timer;
u8 buf[2 * EXC3000_LEN_FRAME];
};
@ -204,6 +210,17 @@ static int exc3000_probe(struct i2c_client *client)
}
timer_setup(&data->timer, exc3000_timer, 0);
data->reset = devm_gpiod_get_optional(&client->dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(data->reset))
return PTR_ERR(data->reset);
if (data->reset) {
msleep(EXC3000_RESET_MS);
gpiod_set_value_cansleep(data->reset, 0);
msleep(EXC3000_READY_MS);
}
input = devm_input_allocate_device(&client->dev);
if (!input)
return -ENOMEM;