diff options
author | Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> | 2017-04-27 22:31:56 +0200 |
---|---|---|
committer | Jonathan Cameron <jic23@kernel.org> | 2017-04-30 17:55:15 +0100 |
commit | d3f770582aeb11db9d8b433d6ee23bdfab3422a2 (patch) | |
tree | 53a0f0fe1eaf7d5796a9c91cd3b932997dbd0133 /drivers | |
parent | 535de397b28a3e24bf93da19dc9581936e420eea (diff) |
iio: imu: st_lsm6dsx: add system power management support
Add system sleep power management support to st_lsm6dsx driver.
In particular during suspend phase each sensor is disabled and
hw fifo is configured in bypass in order to avoid subsequent
I/O operations. The patch has been tested on HiKey board device
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h | 2 | ||||
-rw-r--r-- | drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 54 | ||||
-rw-r--r-- | drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c | 1 | ||||
-rw-r--r-- | drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c | 1 |
4 files changed, 58 insertions, 0 deletions
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h index 7778520f28d4..46352c7bff43 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h @@ -135,6 +135,8 @@ struct st_lsm6dsx_hw { #endif /* CONFIG_SPI_MASTER */ }; +extern const struct dev_pm_ops st_lsm6dsx_pm_ops; + int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id, const char *name, const struct st_lsm6dsx_transfer_function *tf_ops); int st_lsm6dsx_sensor_enable(struct st_lsm6dsx_sensor *sensor); diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c index 462a27b70453..1b53848cdfd8 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c @@ -36,6 +36,7 @@ #include <linux/delay.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> +#include <linux/pm.h> #include <linux/platform_data/st_sensors_pdata.h> @@ -731,6 +732,59 @@ int st_lsm6dsx_probe(struct device *dev, int irq, int hw_id, const char *name, } EXPORT_SYMBOL(st_lsm6dsx_probe); +#ifdef CONFIG_PM +static int st_lsm6dsx_suspend(struct device *dev) +{ + struct st_lsm6dsx_hw *hw = dev_get_drvdata(dev); + struct st_lsm6dsx_sensor *sensor; + int i, err = 0; + + for (i = 0; i < ST_LSM6DSX_ID_MAX; i++) { + sensor = iio_priv(hw->iio_devs[i]); + if (!(hw->enable_mask & BIT(sensor->id))) + continue; + + err = st_lsm6dsx_write_with_mask(hw, + st_lsm6dsx_odr_table[sensor->id].reg.addr, + st_lsm6dsx_odr_table[sensor->id].reg.mask, 0); + if (err < 0) + return err; + } + + if (hw->fifo_mode != ST_LSM6DSX_FIFO_BYPASS) + err = st_lsm6dsx_flush_fifo(hw); + + return err; +} + +static int st_lsm6dsx_resume(struct device *dev) +{ + struct st_lsm6dsx_hw *hw = dev_get_drvdata(dev); + struct st_lsm6dsx_sensor *sensor; + int i, err = 0; + + for (i = 0; i < ST_LSM6DSX_ID_MAX; i++) { + sensor = iio_priv(hw->iio_devs[i]); + if (!(hw->enable_mask & BIT(sensor->id))) + continue; + + err = st_lsm6dsx_set_odr(sensor, sensor->odr); + if (err < 0) + return err; + } + + if (hw->enable_mask) + err = st_lsm6dsx_set_fifo_mode(hw, ST_LSM6DSX_FIFO_CONT); + + return err; +} +#endif /* CONFIG_PM */ + +const struct dev_pm_ops st_lsm6dsx_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(st_lsm6dsx_suspend, st_lsm6dsx_resume) +}; +EXPORT_SYMBOL(st_lsm6dsx_pm_ops); + MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>"); MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); MODULE_DESCRIPTION("STMicroelectronics st_lsm6dsx driver"); diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c index 09a51cfb9b5e..305fec712ab0 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c @@ -98,6 +98,7 @@ MODULE_DEVICE_TABLE(i2c, st_lsm6dsx_i2c_id_table); static struct i2c_driver st_lsm6dsx_driver = { .driver = { .name = "st_lsm6dsx_i2c", + .pm = &st_lsm6dsx_pm_ops, .of_match_table = of_match_ptr(st_lsm6dsx_i2c_of_match), }, .probe = st_lsm6dsx_i2c_probe, diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c index f765a5058488..95472f153ad2 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c @@ -115,6 +115,7 @@ MODULE_DEVICE_TABLE(spi, st_lsm6dsx_spi_id_table); static struct spi_driver st_lsm6dsx_driver = { .driver = { .name = "st_lsm6dsx_spi", + .pm = &st_lsm6dsx_pm_ops, .of_match_table = of_match_ptr(st_lsm6dsx_spi_of_match), }, .probe = st_lsm6dsx_spi_probe, |