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Input: silead - add regulator support

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On some tablets the touchscreen controller is powered by separate
regulators, add support for this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Hans de Goede 2016-11-16 09:37:08 -08:00 committed by Dmitry Torokhov
parent baf28d91e7
commit 6f6deb4866
2 changed files with 31 additions and 0 deletions
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2
Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
View File

@ -18,6 +18,8 @@ Optional properties:
- touchscreen-inverted-y : See touchscreen.txt
- touchscreen-swapped-x-y : See touchscreen.txt
- silead,max-fingers : maximum number of fingers the touchscreen can detect
- vddio-supply : regulator phandle for controller VDDIO
- avdd-supply : regulator phandle for controller AVDD
Example:

29
drivers/input/touchscreen/silead.c
View File

@ -29,6 +29,7 @@
#include <linux/input/touchscreen.h>
#include <linux/pm.h>
#include <linux/irq.h>
#include <linux/regulator/consumer.h>
#include <asm/unaligned.h>
@ -73,6 +74,7 @@ struct silead_ts_data {
struct i2c_client *client;
struct gpio_desc *gpio_power;
struct input_dev *input;
struct regulator_bulk_data regulators[2];
char fw_name[64];
struct touchscreen_properties prop;
u32 max_fingers;
@ -433,6 +435,13 @@ static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
}
#endif
static void silead_disable_regulator(void *arg)
{
struct silead_ts_data *data = arg;
regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
}
static int silead_ts_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -465,6 +474,26 @@ static int silead_ts_probe(struct i2c_client *client,
if (client->irq <= 0)
return -ENODEV;
data->regulators[0].supply = "vddio";
data->regulators[1].supply = "avdd";
error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
data->regulators);
if (error)
return error;
/*
* Enable regulators at probe and disable them at remove, we need
* to keep the chip powered otherwise it forgets its firmware.
*/
error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
data->regulators);
if (error)
return error;
error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
if (error)
return error;
/* Power GPIO pin */
data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
if (IS_ERR(data->gpio_power)) {