Input: silead - add regulator support
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>
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@ -18,6 +18,8 @@ Optional properties:
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- touchscreen-inverted-y : See touchscreen.txt
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- touchscreen-swapped-x-y : See touchscreen.txt
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- silead,max-fingers : maximum number of fingers the touchscreen can detect
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- vddio-supply : regulator phandle for controller VDDIO
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- avdd-supply : regulator phandle for controller AVDD
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Example:
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@ -29,6 +29,7 @@
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#include <linux/input/touchscreen.h>
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#include <linux/pm.h>
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#include <linux/irq.h>
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#include <linux/regulator/consumer.h>
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#include <asm/unaligned.h>
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@ -73,6 +74,7 @@ struct silead_ts_data {
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struct i2c_client *client;
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struct gpio_desc *gpio_power;
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struct input_dev *input;
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struct regulator_bulk_data regulators[2];
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char fw_name[64];
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struct touchscreen_properties prop;
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u32 max_fingers;
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@ -433,6 +435,13 @@ static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
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}
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#endif
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static void silead_disable_regulator(void *arg)
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{
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struct silead_ts_data *data = arg;
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regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
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}
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static int silead_ts_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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@ -465,6 +474,26 @@ static int silead_ts_probe(struct i2c_client *client,
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if (client->irq <= 0)
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return -ENODEV;
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data->regulators[0].supply = "vddio";
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data->regulators[1].supply = "avdd";
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error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
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data->regulators);
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if (error)
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return error;
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/*
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* Enable regulators at probe and disable them at remove, we need
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* to keep the chip powered otherwise it forgets its firmware.
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*/
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error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
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data->regulators);
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if (error)
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return error;
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error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
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if (error)
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return error;
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/* Power GPIO pin */
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data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
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if (IS_ERR(data->gpio_power)) {
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