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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: Rob Herring <robh@kernel.org>
Cc: <devicetree@vger.kernel.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Stephen Boyd 2018-06-21 19:27:17 -07:00 committed by Jiri Kosina
parent d6f8389411
commit 6136f97cd2
3 changed files with 29 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/devicetree/bindings/input/hid-over-i2c.txt
View File

@ -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.

48
drivers/hid/i2c-hid/i2c-hid.c
View File

@ -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) {

7
include/linux/platform_data/i2c-hid.h
View File

@ -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;
};