Commit 6136f97c authored by Stephen Boyd's avatar Stephen Boyd Committed by Jiri Kosina
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HID: i2c-hid: Add vddl regulator control 



Some wacom w9013 devices have a vddl supply for "low valtage"
requirements. Add support in this driver to turn on this low voltage
supply. We can also drop a handful of error messages because the
regulator core is already printing an error when bulk regulators fail to
enable or disable.

Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Dmitry Torokhov <dtor@chromium.org>
Cc: Doug Anderson <dianders@chromium.org>
Acked-by: default avatarRob Herring <robh@kernel.org>
Cc: <devicetree@vger.kernel.org>
Signed-off-by: default avatarStephen Boyd <swboyd@chromium.org>
Acked-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent d6f83894

Documentation/devicetree/bindings/input/hid-over-i2c.txt

+2 −1
Original line number Diff line number Diff line
@@ -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.

drivers/hid/i2c-hid/i2c-hid.c

+24 −24
Original line number Diff line number Diff line
@@ -1021,21 +1021,20 @@ static int i2c_hid_probe(struct i2c_client *client, 
	/* Parse platform agnostic common properties from ACPI / device tree */

	i2c_hid_fwnode_probe(client, &ihid->pdata);



	ihid->pdata.supply = devm_regulator_get(&client->dev, "vdd");

	if (IS_ERR(ihid->pdata.supply)) {

		ret = PTR_ERR(ihid->pdata.supply);

		if (ret != -EPROBE_DEFER)

			dev_err(&client->dev, "Failed to get regulator: %d\n",

				ret);

		goto err;

	}

	ihid->pdata.supplies[0].supply = "vdd";

	ihid->pdata.supplies[1].supply = "vddl";



	ret = devm_regulator_bulk_get(&client->dev,

				      ARRAY_SIZE(ihid->pdata.supplies),

				      ihid->pdata.supplies);

	if (ret)

		return ret;



	ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),

				    ihid->pdata.supplies);

	if (ret < 0)

		return ret;



	ret = regulator_enable(ihid->pdata.supply);

	if (ret < 0) {

		dev_err(&client->dev, "Failed to enable regulator: %d\n",

			ret);

		goto err;

	}

	if (ihid->pdata.post_power_delay_ms)

		msleep(ihid->pdata.post_power_delay_ms);
@@ -1122,9 +1121,8 @@ err_pm: 
	pm_runtime_disable(&client->dev);



err_regulator:

	regulator_disable(ihid->pdata.supply);



err:

	regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),

			       ihid->pdata.supplies);

	i2c_hid_free_buffers(ihid);

	return ret;

}
@@ -1147,7 +1145,8 @@ static int i2c_hid_remove(struct i2c_client *client) 
	if (ihid->bufsize)

		i2c_hid_free_buffers(ihid);



	regulator_disable(ihid->pdata.supply);

	regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),

			       ihid->pdata.supplies);



	return 0;

}
@@ -1198,9 +1197,8 @@ static int i2c_hid_suspend(struct device *dev) 
			hid_warn(hid, "Failed to enable irq wake: %d\n",

				wake_status);

	} else {

		ret = regulator_disable(ihid->pdata.supply);

		if (ret < 0)

			hid_warn(hid, "Failed to disable supply: %d\n", ret);

		regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),

				       ihid->pdata.supplies);

	}



	return 0;
@@ -1215,9 +1213,11 @@ static int i2c_hid_resume(struct device *dev) 
	int wake_status;



	if (!device_may_wakeup(&client->dev)) {

		ret = regulator_enable(ihid->pdata.supply);

		if (ret < 0)

			hid_warn(hid, "Failed to enable supply: %d\n", ret);

		ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),

					    ihid->pdata.supplies);

		if (ret)

			hid_warn(hid, "Failed to enable supplies: %d\n", ret);



		if (ihid->pdata.post_power_delay_ms)

			msleep(ihid->pdata.post_power_delay_ms);

	} else if (ihid->irq_wake_enabled) {

include/linux/platform_data/i2c-hid.h

+3 −4
Original line number Diff line number Diff line
@@ -12,14 +12,13 @@ 
#ifndef __LINUX_I2C_HID_H

#define __LINUX_I2C_HID_H



#include <linux/regulator/consumer.h>

#include <linux/types.h>



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.

 * @supplies: regulators for powering on the 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
@@ -35,7 +34,7 @@ struct regulator; 
 */

struct i2c_hid_platform_data {

	u16 hid_descriptor_address;

	struct regulator *supply;

	struct regulator_bulk_data supplies[2];

	int post_power_delay_ms;

};

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