diff options
Diffstat (limited to 'drivers/iio/proximity/pulsedlight-lidar-lite-v2.c')
| -rw-r--r-- | drivers/iio/proximity/pulsedlight-lidar-lite-v2.c | 56 |
1 files changed, 55 insertions, 1 deletions
diff --git a/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c b/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c index 961f9f990faf..be8ccef735f8 100644 --- a/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c +++ b/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c @@ -13,7 +13,7 @@ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * - * TODO: runtime pm, interrupt mode, and signal strength reporting + * TODO: interrupt mode, and signal strength reporting */ #include <linux/err.h> @@ -21,6 +21,7 @@ #include <linux/i2c.h> #include <linux/delay.h> #include <linux/module.h> +#include <linux/pm_runtime.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> #include <linux/iio/buffer.h> @@ -37,6 +38,7 @@ #define LIDAR_REG_DATA_HBYTE 0x0f #define LIDAR_REG_DATA_LBYTE 0x10 +#define LIDAR_REG_PWR_CONTROL 0x65 #define LIDAR_DRV_NAME "lidar" @@ -90,6 +92,12 @@ static inline int lidar_write_control(struct lidar_data *data, int val) return i2c_smbus_write_byte_data(data->client, LIDAR_REG_CONTROL, val); } +static inline int lidar_write_power(struct lidar_data *data, int val) +{ + return i2c_smbus_write_byte_data(data->client, + LIDAR_REG_PWR_CONTROL, val); +} + static int lidar_read_measurement(struct lidar_data *data, u16 *reg) { int ret; @@ -116,6 +124,8 @@ static int lidar_get_measurement(struct lidar_data *data, u16 *reg) int tries = 10; int ret; + pm_runtime_get_sync(&client->dev); + /* start sample */ ret = lidar_write_control(data, LIDAR_REG_CONTROL_ACQUIRE); if (ret < 0) { @@ -144,6 +154,8 @@ static int lidar_get_measurement(struct lidar_data *data, u16 *reg) } ret = -EIO; } + pm_runtime_mark_last_busy(&client->dev); + pm_runtime_put_autosuspend(&client->dev); return ret; } @@ -243,6 +255,17 @@ static int lidar_probe(struct i2c_client *client, if (ret) goto error_unreg_buffer; + pm_runtime_set_autosuspend_delay(&client->dev, 1000); + pm_runtime_use_autosuspend(&client->dev); + + ret = pm_runtime_set_active(&client->dev); + if (ret) + goto error_unreg_buffer; + pm_runtime_enable(&client->dev); + + pm_runtime_mark_last_busy(&client->dev); + pm_runtime_idle(&client->dev); + return 0; error_unreg_buffer: @@ -258,6 +281,9 @@ static int lidar_remove(struct i2c_client *client) iio_device_unregister(indio_dev); iio_triggered_buffer_cleanup(indio_dev); + pm_runtime_disable(&client->dev); + pm_runtime_set_suspended(&client->dev); + return 0; } @@ -273,10 +299,38 @@ static const struct of_device_id lidar_dt_ids[] = { }; MODULE_DEVICE_TABLE(of, lidar_dt_ids); +#ifdef CONFIG_PM +static int lidar_pm_runtime_suspend(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct lidar_data *data = iio_priv(indio_dev); + + return lidar_write_power(data, 0x0f); +} + +static int lidar_pm_runtime_resume(struct device *dev) +{ + struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); + struct lidar_data *data = iio_priv(indio_dev); + int ret = lidar_write_power(data, 0); + + /* regulator and FPGA needs settling time */ + usleep_range(15000, 20000); + + return ret; +} +#endif + +static const struct dev_pm_ops lidar_pm_ops = { + SET_RUNTIME_PM_OPS(lidar_pm_runtime_suspend, + lidar_pm_runtime_resume, NULL) +}; + static struct i2c_driver lidar_driver = { .driver = { .name = LIDAR_DRV_NAME, .of_match_table = of_match_ptr(lidar_dt_ids), + .pm = &lidar_pm_ops, }, .probe = lidar_probe, .remove = lidar_remove, |