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iio: light: us8152d: Add power management support 

Add power management for sleep as well as runtime pm.

Signed-off-by: Adriana Reus <adriana.reus@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Adriana Reus 2015-11-24 12:59:51 +02:00 committed by Jonathan Cameron
parent a22a3c5c40
commit f0e5f57d3a
1 changed files with 88 additions and 7 deletions
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93
drivers/iio/light/us5182d.c
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@ -23,6 +23,8 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#define US5182D_REG_CFG0 0x00
#define US5182D_CFG0_ONESHOT_EN BIT(6)
@ -81,6 +83,7 @@
#define US5182D_READ_BYTE 1
#define US5182D_READ_WORD 2
#define US5182D_OPSTORE_SLEEP_TIME 20 /* ms */
#define US5182D_SLEEP_MS 3000 /* ms */
/* Available ranges: [12354, 7065, 3998, 2202, 1285, 498, 256, 138] lux */
static const int us5182d_scales[] = {188500, 107800, 61000, 33600, 19600, 7600,
@ -300,6 +303,26 @@ static int us5182d_shutdown_en(struct us5182d_data *data, u8 state)
return ret;
}
static int us5182d_set_power_state(struct us5182d_data *data, bool on)
{
int ret;
if (data->power_mode == US5182D_ONESHOT)
return 0;
if (on) {
ret = pm_runtime_get_sync(&data->client->dev);
if (ret < 0)
pm_runtime_put_noidle(&data->client->dev);
} else {
pm_runtime_mark_last_busy(&data->client->dev);
ret = pm_runtime_put_autosuspend(&data->client->dev);
}
return ret;
}
static int us5182d_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
@ -317,15 +340,20 @@ static int us5182d_read_raw(struct iio_dev *indio_dev,
if (ret < 0)
goto out_err;
}
ret = us5182d_als_enable(data);
ret = us5182d_set_power_state(data, true);
if (ret < 0)
goto out_err;
ret = us5182d_als_enable(data);
if (ret < 0)
goto out_poweroff;
ret = us5182d_get_als(data);
if (ret < 0)
goto out_poweroff;
*val = ret;
ret = us5182d_set_power_state(data, false);
if (ret < 0)
goto out_err;
mutex_unlock(&data->lock);
*val = ret;
return IIO_VAL_INT;
case IIO_PROXIMITY:
mutex_lock(&data->lock);
@ -334,16 +362,21 @@ static int us5182d_read_raw(struct iio_dev *indio_dev,
if (ret < 0)
goto out_err;
}
ret = us5182d_px_enable(data);
ret = us5182d_set_power_state(data, true);
if (ret < 0)
goto out_err;
ret = us5182d_px_enable(data);
if (ret < 0)
goto out_poweroff;
ret = i2c_smbus_read_word_data(data->client,
US5182D_REG_PDL);
if (ret < 0)
goto out_poweroff;
*val = ret;
ret = us5182d_set_power_state(data, false);
if (ret < 0)
goto out_err;
mutex_unlock(&data->lock);
*val = ret;
return IIO_VAL_INT;
default:
return -EINVAL;
@ -363,6 +396,9 @@ static int us5182d_read_raw(struct iio_dev *indio_dev,
}
return -EINVAL;
out_poweroff:
us5182d_set_power_state(data, false);
out_err:
mutex_unlock(&data->lock);
return ret;
@ -579,6 +615,17 @@ static int us5182d_probe(struct i2c_client *client,
if (ret < 0)
goto out_err;
if (data->default_continuous) {
pm_runtime_set_active(&client->dev);
if (ret < 0)
goto out_err;
}
pm_runtime_enable(&client->dev);
pm_runtime_set_autosuspend_delay(&client->dev,
US5182D_SLEEP_MS);
pm_runtime_use_autosuspend(&client->dev);
ret = iio_device_register(indio_dev);
if (ret < 0)
goto out_err;
@ -597,9 +644,42 @@ static int us5182d_remove(struct i2c_client *client)
iio_device_unregister(i2c_get_clientdata(client));
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);
return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
}
#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM)
static int us5182d_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct us5182d_data *data = iio_priv(indio_dev);
if (data->power_mode == US5182D_CONTINUOUS)
return us5182d_shutdown_en(data, US5182D_CFG0_SHUTDOWN_EN);
return 0;
}
static int us5182d_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct us5182d_data *data = iio_priv(indio_dev);
if (data->power_mode == US5182D_CONTINUOUS)
return us5182d_shutdown_en(data,
~US5182D_CFG0_SHUTDOWN_EN & 0xff);
return 0;
}
#endif
static const struct dev_pm_ops us5182d_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(us5182d_suspend, us5182d_resume)
SET_RUNTIME_PM_OPS(us5182d_suspend, us5182d_resume, NULL)
};
static const struct acpi_device_id us5182d_acpi_match[] = {
{ "USD5182", 0},
{}
@ -617,6 +697,7 @@ MODULE_DEVICE_TABLE(i2c, us5182d_id);
static struct i2c_driver us5182d_driver = {
.driver = {
.name = US5182D_DRV_NAME,
.pm = &us5182d_pm_ops,
.acpi_match_table = ACPI_PTR(us5182d_acpi_match),
},
.probe = us5182d_probe,