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iio: humidity: hts221: add power management support

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Add system sleep power management support to hts221 driver

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lorenzo Bianconi 2017-05-14 17:45:44 +02:00 committed by Jonathan Cameron
parent 3691e5a694
commit b7079eeac5
4 changed files with 55 additions and 4 deletions
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3
drivers/iio/humidity/hts221.h
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@ -57,12 +57,15 @@ struct hts221_hw {
struct hts221_sensor sensors[HTS221_SENSOR_MAX];
bool enabled;
u8 odr;
const struct hts221_transfer_function *tf;
struct hts221_transfer_buffer tb;
};
extern const struct dev_pm_ops hts221_pm_ops;
int hts221_config_drdy(struct hts221_hw *hw, bool enable);
int hts221_probe(struct iio_dev *iio_dev);
int hts221_power_on(struct hts221_hw *hw);

54
drivers/iio/humidity/hts221_core.c
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@ -13,6 +13,7 @@
#include <linux/device.h>
#include <linux/iio/sysfs.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <asm/unaligned.h>
#include "hts221.h"
@ -307,15 +308,30 @@ hts221_sysfs_temp_oversampling_avail(struct device *dev,
int hts221_power_on(struct hts221_hw *hw)
{
return hts221_update_odr(hw, hw->odr);
int err;
err = hts221_update_odr(hw, hw->odr);
if (err < 0)
return err;
hw->enabled = true;
return 0;
}
int hts221_power_off(struct hts221_hw *hw)
{
u8 data[] = {0x00, 0x00};
__le16 data = 0;
int err;
return hw->tf->write(hw->dev, HTS221_REG_CNTRL1_ADDR, sizeof(data),
data);
err = hw->tf->write(hw->dev, HTS221_REG_CNTRL1_ADDR, sizeof(data),
(u8 *)&data);
if (err < 0)
return err;
hw->enabled = false;
return 0;
}
static int hts221_parse_temp_caldata(struct hts221_hw *hw)
@ -682,6 +698,36 @@ int hts221_probe(struct iio_dev *iio_dev)
}
EXPORT_SYMBOL(hts221_probe);
static int __maybe_unused hts221_suspend(struct device *dev)
{
struct iio_dev *iio_dev = dev_get_drvdata(dev);
struct hts221_hw *hw = iio_priv(iio_dev);
__le16 data = 0;
int err;
err = hw->tf->write(hw->dev, HTS221_REG_CNTRL1_ADDR, sizeof(data),
(u8 *)&data);
return err < 0 ? err : 0;
}
static int __maybe_unused hts221_resume(struct device *dev)
{
struct iio_dev *iio_dev = dev_get_drvdata(dev);
struct hts221_hw *hw = iio_priv(iio_dev);
int err = 0;
if (hw->enabled)
err = hts221_update_odr(hw, hw->odr);
return err;
}
const struct dev_pm_ops hts221_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(hts221_suspend, hts221_resume)
};
EXPORT_SYMBOL(hts221_pm_ops);
MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
MODULE_DESCRIPTION("STMicroelectronics hts221 sensor driver");
MODULE_LICENSE("GPL v2");

1
drivers/iio/humidity/hts221_i2c.c
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@ -105,6 +105,7 @@ MODULE_DEVICE_TABLE(i2c, hts221_i2c_id_table);
static struct i2c_driver hts221_driver = {
.driver = {
.name = "hts221_i2c",
.pm = &hts221_pm_ops,
.of_match_table = of_match_ptr(hts221_i2c_of_match),
.acpi_match_table = ACPI_PTR(hts221_acpi_match),
},

1
drivers/iio/humidity/hts221_spi.c
View File

@ -113,6 +113,7 @@ MODULE_DEVICE_TABLE(spi, hts221_spi_id_table);
static struct spi_driver hts221_driver = {
.driver = {
.name = "hts221_spi",
.pm = &hts221_pm_ops,
.of_match_table = of_match_ptr(hts221_spi_of_match),
},
.probe = hts221_spi_probe,