On Sat, Jul 21, 2018 at 06:31:07PM +0100, Jonathan Cameron wrote: > On Tue, 17 Jul 2018 04:41:52 -0400 > Brian Masney <masneyb@xxxxxxxxxxxxx> wrote: > > > 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> > > I'm not 100% sure what the purpose of the regulator_enabled > tracking is. Perhaps you could point out the path where that is > needed? I was thinking about the use case where the device is compiled into the kernel as a module, the device is suspended, and then someone rmmods the module. If that is not a use case that I need to worry about, then the flag can go away and it will simplify the code. Brian > Also, a missing bit of documentation needs adding. > > Jonathan > > > --- > > 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 | 73 +++++++++++++++++++ > > drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h | 3 + > > 3 files changed, 77 insertions(+) > > > > 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..e1fbab4bc0a0 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 +927,46 @@ 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 { > > + st->regulator_enabled = true; > > + > > + /* 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; > > + > > + if (!st->regulator_enabled) > > + return 0; > > + > > + result = regulator_disable(st->vddio_supply); > > + if (result) > > + dev_err(regmap_get_device(st->map), > > + "Failed to disable regulator: %d\n", result); > > + > > + st->regulator_enabled = false; > > + > > + 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) > > { > > @@ -990,6 +1031,28 @@ 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) > > @@ -1049,7 +1112,12 @@ 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; > > @@ -1062,6 +1130,11 @@ 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 = inv_mpu_core_disable_regulator(st); > > +out_unlock: > > 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..01c8fe9b4fa0 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. > Docs missing for regulator_enabled. > > */ > > struct inv_mpu6050_state { > > struct mutex lock; > > @@ -149,6 +150,8 @@ struct inv_mpu6050_state { > > s64 chip_period; > > s64 it_timestamp; > > s64 data_timestamp; > > + struct regulator *vddio_supply; > > + bool regulator_enabled; > > }; > > > > /*register and associated bit definition*/ -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
