On some tablets the touchscreen controller is powered by separate
regulators, add support for this.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
---
Changes in v2:
-Use devm_regulator_bulk_get() and friends
-Use devm_add_action_or_reset() to disable the regulator
---
.../bindings/input/touchscreen/silead_gsl1680.txt | 2 ++
drivers/input/touchscreen/silead.c | 29 ++++++++++++++++++++++
2 files changed, 31 insertions(+)
diff --git a/Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt b/Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
index e844c3f..b726823 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/silead_gsl1680.txt
@@ -22,6 +22,8 @@ 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:
diff --git a/drivers/input/touchscreen/silead.c b/drivers/input/touchscreen/silead.c
index f502c84..404830a 100644
--- a/drivers/input/touchscreen/silead.c
+++ b/drivers/input/touchscreen/silead.c
@@ -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)) {
--
2.9.3
--
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