Some wacom w9013 devices have a vddl supply for "low voltage"
requirements. Add support in this driver to turn on this low voltage
supply.
Cc: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Cc: Hans de Goede <hdegoede@xxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Dmitry Torokhov <dtor@xxxxxxxxxxxx>
Cc: Doug Anderson <dianders@xxxxxxxxxxxx>
Cc: <devicetree@xxxxxxxxxxxxxxx>
Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
---
.../bindings/input/hid-over-i2c.txt | 3 ++-
drivers/hid/i2c-hid/i2c-hid.c | 19 +++++++++++++++++++
include/linux/platform_data/i2c-hid.h | 2 ++
3 files changed, 23 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/input/hid-over-i2c.txt b/Documentation/devicetree/bindings/input/hid-over-i2c.txt
index 4d3da9d91de4..89e6ab89ba38 100644
--- a/Documentation/devicetree/bindings/input/hid-over-i2c.txt
+++ b/Documentation/devicetree/bindings/input/hid-over-i2c.txt
@@ -26,7 +26,8 @@ device-specific compatible properties, which should be used in addition to the
- compatible:
* "wacom,w9013" (Wacom W9013 digitizer). Supports:
- - vdd-supply
+ - vdd-supply (3.3V)
+ - vddl-supply (1.8V)
- post-power-on-delay-ms
- vdd-supply: phandle of the regulator that provides the supply voltage.
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 6e803f361249..b6f02f98fec6 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -1032,12 +1032,29 @@ static int i2c_hid_probe(struct i2c_client *client,
goto err;
}
+ ihid->pdata.supply_l = devm_regulator_get(&client->dev, "vddl");
+ if (IS_ERR(ihid->pdata.supply_l)) {
+ ret = PTR_ERR(ihid->pdata.supply_l);
+ if (ret != -EPROBE_DEFER)
+ dev_err(&client->dev, "Failed to get regulator: %d\n",
+ ret);
+ goto err;
+ }
+
ret = regulator_enable(ihid->pdata.supply);
if (ret < 0) {
dev_err(&client->dev, "Failed to enable regulator: %d\n",
ret);
goto err;
}
+
+ ret = regulator_enable(ihid->pdata.supply_l);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to enable low regulator: %d\n",
+ ret);
+ goto err_regulator_l;
+ }
+
if (ihid->pdata.post_power_delay_ms)
msleep(ihid->pdata.post_power_delay_ms);
@@ -1124,6 +1141,8 @@ static int i2c_hid_probe(struct i2c_client *client,
pm_runtime_disable(&client->dev);
err_regulator:
+ regulator_disable(ihid->pdata.supply_l);
+err_regulator_l:
regulator_disable(ihid->pdata.supply);
err:
diff --git a/include/linux/platform_data/i2c-hid.h b/include/linux/platform_data/i2c-hid.h
index 1fb088239d12..1e4612751adf 100644
--- a/include/linux/platform_data/i2c-hid.h
+++ b/include/linux/platform_data/i2c-hid.h
@@ -20,6 +20,7 @@ struct regulator;
* struct i2chid_platform_data - used by hid over i2c implementation.
* @hid_descriptor_address: i2c register where the HID descriptor is stored.
* @supply: regulator for powering on the device.
+ * @supply_l: regulator for powering on the low voltage supply for device.
* @post_power_delay_ms: delay after powering on before device is usable.
*
* Note that it is the responsibility of the platform driver (or the acpi 5.0
@@ -36,6 +37,7 @@ struct regulator;
struct i2c_hid_platform_data {
u16 hid_descriptor_address;
struct regulator *supply;
+ struct regulator *supply_l;
int post_power_delay_ms;
};
--
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