diff options
| -rw-r--r-- | drivers/iio/magnetometer/ak8975.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c index 3e12201b823f..af8606cc7812 100644 --- a/drivers/iio/magnetometer/ak8975.c +++ b/drivers/iio/magnetometer/ak8975.c @@ -33,6 +33,7 @@ #include <linux/of_gpio.h> #include <linux/acpi.h> #include <linux/regulator/consumer.h> +#include <linux/pm_runtime.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> @@ -692,6 +693,8 @@ static int ak8975_read_axis(struct iio_dev *indio_dev, int index, int *val) u16 buff; int ret; + pm_runtime_get_sync(&data->client->dev); + mutex_lock(&data->lock); ret = ak8975_start_read_axis(data, client); @@ -706,6 +709,9 @@ static int ak8975_read_axis(struct iio_dev *indio_dev, int index, int *val) mutex_unlock(&data->lock); + pm_runtime_mark_last_busy(&data->client->dev); + pm_runtime_put_autosuspend(&data->client->dev); + /* Swap bytes and convert to valid range. */ buff = le16_to_cpu(buff); *val = clamp_t(s16, buff, -def->range, def->range); @@ -975,6 +981,18 @@ static int ak8975_probe(struct i2c_client *client, goto cleanup_buffer; } + /* Enable runtime PM */ + pm_runtime_get_noresume(&client->dev); + pm_runtime_set_active(&client->dev); + pm_runtime_enable(&client->dev); + /* + * The device comes online in 500us, so add two orders of magnitude + * of delay before autosuspending: 50 ms. + */ + pm_runtime_set_autosuspend_delay(&client->dev, 50); + pm_runtime_use_autosuspend(&client->dev); + pm_runtime_put(&client->dev); + return 0; cleanup_buffer: @@ -989,6 +1007,9 @@ static int ak8975_remove(struct i2c_client *client) struct iio_dev *indio_dev = i2c_get_clientdata(client); struct ak8975_data *data = iio_priv(indio_dev); + pm_runtime_get_sync(&client->dev); + pm_runtime_put_noidle(&client->dev); + pm_runtime_disable(&client->dev); iio_device_unregister(indio_dev); iio_triggered_buffer_cleanup(indio_dev); ak8975_set_mode(data, POWER_DOWN); @@ -997,6 +1018,56 @@ static int ak8975_remove(struct i2c_client *client) return 0; } +#ifdef CONFIG_PM +static int ak8975_runtime_suspend(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct ak8975_data *data = iio_priv(indio_dev); + int ret; + + /* Set the device in power down if it wasn't already */ + ret = ak8975_set_mode(data, POWER_DOWN); + if (ret < 0) { + dev_err(&client->dev, "Error in setting power-down mode\n"); + return ret; + } + /* Next cut the regulators */ + ak8975_power_off(data); + + return 0; +} + +static int ak8975_runtime_resume(struct device *dev) +{ + struct i2c_client *client = to_i2c_client(dev); + struct iio_dev *indio_dev = i2c_get_clientdata(client); + struct ak8975_data *data = iio_priv(indio_dev); + int ret; + + /* Take up the regulators */ + ak8975_power_on(data); + /* + * We come up in powered down mode, the reading routines will + * put us in the mode to read values later. + */ + ret = ak8975_set_mode(data, POWER_DOWN); + if (ret < 0) { + dev_err(&client->dev, "Error in setting power-down mode\n"); + return ret; + } + + return 0; +} +#endif /* CONFIG_PM */ + +static const struct dev_pm_ops ak8975_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, + pm_runtime_force_resume) + SET_RUNTIME_PM_OPS(ak8975_runtime_suspend, + ak8975_runtime_resume, NULL) +}; + static const struct i2c_device_id ak8975_id[] = { {"ak8975", AK8975}, {"ak8963", AK8963}, @@ -1024,6 +1095,7 @@ MODULE_DEVICE_TABLE(of, ak8975_of_match); static struct i2c_driver ak8975_driver = { .driver = { .name = "ak8975", + .pm = &ak8975_dev_pm_ops, .of_match_table = of_match_ptr(ak8975_of_match), .acpi_match_table = ACPI_PTR(ak_acpi_match), }, |