This patch adds support for the regulator framework to the mpu6050 driver. Signed-off-by: Brian Masney <masneyb@xxxxxxxxxxxxx> Signed-off-by: Jonathan Marek <jonathan@xxxxxxxx> --- 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. (See my previous patch in this series) - 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 | 57 +++++++++++++++++-- drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c | 2 +- drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h | 3 + drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c | 9 +++ 5 files changed, 66 insertions(+), 6 deletions(-) diff --git a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt index b7def51c8ad9..d39907b12a46 100644 --- a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt +++ b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt @@ -21,6 +21,7 @@ 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 12c1b9507007..ec276b7bcc69 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 +927,19 @@ 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 == 0) { + /* Give the device a little bit of time to start up. */ + usleep_range(35000, 70000); + } + + return result; +} + int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name, int (*inv_mpu_bus_setup)(struct iio_dev *), int chip_type) { @@ -990,15 +1004,28 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name, return -EINVAL; } + st->vddio_supply = devm_regulator_get_optional(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; + /* power is turned on inside check chip type*/ result = inv_check_and_setup_chip(st); if (result) - return result; + goto out_disable_regulator; result = inv_mpu6050_init_config(indio_dev); if (result) { dev_err(dev, "Could not initialize device.\n"); - return result; + goto out_disable_regulator; } if (inv_mpu_bus_setup) @@ -1023,24 +1050,34 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name, NULL); if (result) { dev_err(dev, "configure buffer fail %d\n", result); - return result; + goto out_disable_regulator; } result = inv_mpu6050_probe_trigger(indio_dev, irq_type); if (result) { dev_err(dev, "trigger probe fail %d\n", result); - return result; + goto out_disable_regulator; } result = devm_iio_device_register(dev, indio_dev); if (result) { dev_err(dev, "IIO register fail %d\n", result); - return result; + goto out_disable_regulator; } return 0; + +out_disable_regulator: + regulator_disable(st->vddio_supply); + return result; + } EXPORT_SYMBOL_GPL(inv_mpu_core_probe); +int inv_mpu_core_remove(struct inv_mpu6050_state *st) +{ + return regulator_disable(st->vddio_supply); +} + #ifdef CONFIG_PM_SLEEP static int inv_mpu_resume(struct device *dev) @@ -1050,6 +1087,11 @@ static int inv_mpu_resume(struct device *dev) mutex_lock(&st->lock); result = inv_mpu6050_set_power_itg(st, true); + if (result) + goto out_unlock; + + result = inv_mpu_core_enable_regulator(st); +out_unlock: mutex_unlock(&st->lock); return result; @@ -1062,6 +1104,11 @@ static int inv_mpu_suspend(struct device *dev) mutex_lock(&st->lock); result = inv_mpu6050_set_power_itg(st, false); + if (result) + goto out_unlock; + + result = regulator_disable(st->vddio_supply); +out_unlock: mutex_unlock(&st->lock); return result; diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c index dd758e3d403d..ce227038c61c 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_i2c.c @@ -164,7 +164,7 @@ static int inv_mpu_remove(struct i2c_client *client) i2c_mux_del_adapters(st->muxc); } - return 0; + return inv_mpu_core_remove(st); } /* diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h index e69a59659dbc..0289615a6135 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*/ @@ -321,4 +323,5 @@ int inv_mpu_acpi_create_mux_client(struct i2c_client *client); void inv_mpu_acpi_delete_mux_client(struct i2c_client *client); int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name, int (*inv_mpu_bus_setup)(struct iio_dev *), int chip_type); +int inv_mpu_core_remove(struct inv_mpu6050_state *st); extern const struct dev_pm_ops inv_mpu_pmops; diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c index 227f50afff22..fce935f8f1e4 100644 --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_spi.c @@ -70,6 +70,14 @@ static int inv_mpu_probe(struct spi_device *spi) inv_mpu_i2c_disable, chip_type); } +static int inv_mpu_remove(struct spi_device *spi) +{ + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct inv_mpu6050_state *st = iio_priv(indio_dev); + + return inv_mpu_core_remove(st); +} + /* * device id table is used to identify what device can be * supported by this driver @@ -94,6 +102,7 @@ MODULE_DEVICE_TABLE(acpi, inv_acpi_match); static struct spi_driver inv_mpu_driver = { .probe = inv_mpu_probe, + .remove = inv_mpu_remove, .id_table = inv_mpu_id, .driver = { .acpi_match_table = ACPI_PTR(inv_acpi_match), -- 2.17.1 -- To unsubscribe from this list: send the line "unsubscribe linux-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
