[PATCH 4/5] iio: light: us8152d: Add power management support

Adriana Reus
2015-11-24T10:59:51Z

Add power management for sleep as well as runtime pm.

Signed-off-by: Adriana Reus <adriana.reus@intel.com>
---
drivers/iio/light/us5182d.c | 95 +++++++++++++++++++++++++++++++++++++++++----
1 file changed, 88 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/light/us5182d.c b/drivers/iio/light/us5182d.c
index 3d959f3..60cab4a 100644
--- a/drivers/iio/light/us5182d.c
+++ b/drivers/iio/light/us5182d.c
@@ -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,
@@ -298,6 +301,26 @@ 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)
@@ -315,15 +338,20 @@ 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);
@@ -332,17 +360,22 @@ 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;
+ return IIO_VAL_INT;
default:
return -EINVAL;
}
@@ -361,6 +394,9 @@ 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;
@@ -577,6 +613,17 @@ 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;
@@ -595,9 +642,42 @@ 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},
{}
@@ -615,6 +695,7 @@ 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,
--
1.9.1