iio: sx9500: add power management
Signed-off-by: Vlad Dogaru <vlad.dogaru@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/proximity/sx9500.c b/drivers/iio/proximity/sx9500.c
index fa40f6d..d2c52f9 100644
--- a/drivers/iio/proximity/sx9500.c
+++ b/drivers/iio/proximity/sx9500.c
@@ -18,6 +18,7 @@
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/regmap.h>
+#include <linux/pm.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
@@ -89,6 +90,8 @@
bool event_enabled[SX9500_NUM_CHANNELS];
bool trigger_enabled;
u16 *buffer;
+ /* Remember enabled channels and sample rate during suspend. */
+ unsigned int suspend_ctrl0;
};
static const struct iio_event_spec sx9500_events[] = {
@@ -720,6 +723,49 @@
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int sx9500_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_read(data->regmap, SX9500_REG_PROX_CTRL0,
+ &data->suspend_ctrl0);
+ if (ret < 0)
+ goto out;
+
+ /*
+ * Scan period doesn't matter because when all the sensors are
+ * deactivated the device is in sleep mode.
+ */
+ ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0, 0);
+
+out:
+ mutex_unlock(&data->mutex);
+ return ret;
+}
+
+static int sx9500_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct sx9500_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->mutex);
+ ret = regmap_write(data->regmap, SX9500_REG_PROX_CTRL0,
+ data->suspend_ctrl0);
+ mutex_unlock(&data->mutex);
+
+ return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops sx9500_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(sx9500_suspend, sx9500_resume)
+};
+
static const struct acpi_device_id sx9500_acpi_match[] = {
{"SSX9500", 0},
{ },
@@ -736,6 +782,7 @@
.driver = {
.name = SX9500_DRIVER_NAME,
.acpi_match_table = ACPI_PTR(sx9500_acpi_match),
+ .pm = &sx9500_pm_ops,
},
.probe = sx9500_probe,
.remove = sx9500_remove,