hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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>
This commit is contained in:
Lorenzo Bianconi 2017-04-27 22:31:56 +02:00 committed by Jonathan Cameron
parent 535de397b2
commit d3f770582a
4 changed files with 58 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
View File

@ -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);

54
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
View File

@ -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");

1
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_i2c.c
View File

@ -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,

1
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_spi.c
View File

@ -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,