* 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>
#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>
#define LIDAR_REG_DATA_HBYTE 0x0f
#define LIDAR_REG_DATA_LBYTE 0x10
+#define LIDAR_REG_PWR_CONTROL 0x65
#define LIDAR_DRV_NAME "lidar"
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;
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) {
}
ret = -EIO;
}
+ pm_runtime_mark_last_busy(&client->dev);
+ pm_runtime_put_autosuspend(&client->dev);
return ret;
}
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:
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+
return 0;
}
};
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,