This patch adds support for the regulator framework to the mpu6050 driver. Signed-off-by: Brian Masney <masn...@onstation.org> Signed-off-by: Jonathan Marek <jonat...@marek.ca> Acked-by: Rob Herring <r...@kernel.org> --- Changes since v2: - Dropped regulator_enabled value since it is not needed.
Changes since v1: - Use devm_regulator_get() instead of devm_regulator_get_optional() - Use devm_add_action() for cleaning up the regulator. - Correct ordering of resume code. - Add regulator_enabled flag to ensure regulator is not disabled twice, specifically the case where the device is suspended and then the driver is removed. Original extra changelog from v1: This is a variation of Jonathan Marek's patch from postmarketOS https://gitlab.com/postmarketOS/linux-postmarketos/commit/b8ad1ec1859c8bbcbce94944b3f4dd68f8f9fc37 with the following changes: - Stripped out 6515 variant code. - Add the regulator to the mpu core instead of only the i2c variant. - Add error handling. - Release the regulator on suspend, device remove, etc. - Device tree documentation. .../bindings/iio/imu/inv_mpu6050.txt | 1 + drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 62 +++++++++++++++++++ drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h | 2 + 3 files changed, 65 insertions(+) diff --git a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt index b2f27da847b8..6ab9a9d196b0 100644 --- a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt +++ b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt @@ -20,6 +20,7 @@ Required properties: bindings. Optional properties: + - vddio-supply: regulator phandle for VDDIO supply - mount-matrix: an optional 3x3 mounting rotation matrix - i2c-gate node. These devices also support an auxiliary i2c bus. This is simple enough to be described using the i2c-gate binding. See diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c index d80ef468508a..1e428c196a82 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c @@ -23,6 +23,7 @@ #include <linux/iio/iio.h> #include <linux/acpi.h> #include <linux/platform_device.h> +#include <linux/regulator/consumer.h> #include "inv_mpu_iio.h" /* @@ -926,6 +927,39 @@ static int inv_check_and_setup_chip(struct inv_mpu6050_state *st) return result; } +static int inv_mpu_core_enable_regulator(struct inv_mpu6050_state *st) +{ + int result; + + result = regulator_enable(st->vddio_supply); + if (result) { + dev_err(regmap_get_device(st->map), + "Failed to enable regulator: %d\n", result); + } else { + /* Give the device a little bit of time to start up. */ + usleep_range(35000, 70000); + } + + return result; +} + +static int inv_mpu_core_disable_regulator(struct inv_mpu6050_state *st) +{ + int result; + + result = regulator_disable(st->vddio_supply); + if (result) + dev_err(regmap_get_device(st->map), + "Failed to disable regulator: %d\n", result); + + return result; +} + +static void inv_mpu_core_disable_regulator_action(void *_data) +{ + inv_mpu_core_disable_regulator(_data); +} + int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name, int (*inv_mpu_bus_setup)(struct iio_dev *), int chip_type) { @@ -992,6 +1026,28 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name, return -EINVAL; } + st->vddio_supply = devm_regulator_get(dev, "vddio"); + if (IS_ERR(st->vddio_supply)) { + if (PTR_ERR(st->vddio_supply) != -EPROBE_DEFER) + dev_err(dev, "Failed to get vddio regulator %d\n", + (int)PTR_ERR(st->vddio_supply)); + + return PTR_ERR(st->vddio_supply); + } + + result = inv_mpu_core_enable_regulator(st); + if (result) + return result; + + result = devm_add_action(dev, inv_mpu_core_disable_regulator_action, + st); + if (result) { + inv_mpu_core_disable_regulator_action(st); + dev_err(dev, "Failed to setup regulator cleanup action %d\n", + result); + return result; + } + /* power is turned on inside check chip type*/ result = inv_check_and_setup_chip(st); if (result) @@ -1051,7 +1107,12 @@ static int inv_mpu_resume(struct device *dev) int result; mutex_lock(&st->lock); + result = inv_mpu_core_enable_regulator(st); + if (result) + goto out_unlock; + result = inv_mpu6050_set_power_itg(st, true); +out_unlock: mutex_unlock(&st->lock); return result; @@ -1064,6 +1125,7 @@ static int inv_mpu_suspend(struct device *dev) mutex_lock(&st->lock); result = inv_mpu6050_set_power_itg(st, false); + inv_mpu_core_disable_regulator(st); mutex_unlock(&st->lock); return result; diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h index e69a59659dbc..6bcc11fc1b88 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h @@ -129,6 +129,7 @@ struct inv_mpu6050_hw { * @chip_period: chip internal period estimation (~1kHz). * @it_timestamp: timestamp from previous interrupt. * @data_timestamp: timestamp for next data sample. + * @vddio_supply voltage regulator for the chip. */ struct inv_mpu6050_state { struct mutex lock; @@ -149,6 +150,7 @@ struct inv_mpu6050_state { s64 chip_period; s64 it_timestamp; s64 data_timestamp; + struct regulator *vddio_supply; }; /*register and associated bit definition*/ -- 2.17.1
