iio: pressure-core: st: Provide support for the Vdd power supply
The power to some of the sensors are controlled by regulators. In most
cases these are 'always on', but if not they will fail to work until
the regulator is enabled using the relevant APIs. This patch allows for
the Vdd power supply to be specified by either platform data or Device
Tree.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/pressure/st_pressure_core.c b/drivers/iio/pressure/st_pressure_core.c
index 2da411b..baeab10 100644
--- a/drivers/iio/pressure/st_pressure_core.c
+++ b/drivers/iio/pressure/st_pressure_core.c
@@ -23,6 +23,7 @@
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/buffer.h>
+#include <linux/regulator/consumer.h>
#include <asm/unaligned.h>
#include <linux/iio/common/st_sensors.h>
@@ -313,6 +314,29 @@
#define ST_PRESS_TRIGGER_OPS NULL
#endif
+static void st_press_power_enable(struct iio_dev *indio_dev)
+{
+ struct st_sensor_data *pdata = iio_priv(indio_dev);
+ int err;
+
+ /* Regulators not mandatory, but if requested we should enable it. */
+ pdata->vdd = devm_regulator_get_optional(&indio_dev->dev, "vdd");
+ if (!IS_ERR(pdata->vdd)) {
+ err = regulator_enable(pdata->vdd);
+ if (err != 0)
+ dev_warn(&indio_dev->dev,
+ "Failed to enable specified Vdd supply\n");
+ }
+}
+
+static void st_press_power_disable(struct iio_dev *indio_dev)
+{
+ struct st_sensor_data *pdata = iio_priv(indio_dev);
+
+ if (!IS_ERR(pdata->vdd))
+ regulator_disable(pdata->vdd);
+}
+
int st_press_common_probe(struct iio_dev *indio_dev,
struct st_sensors_platform_data *plat_data)
{
@@ -323,6 +347,8 @@
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &press_info;
+ st_press_power_enable(indio_dev);
+
err = st_sensors_check_device_support(indio_dev,
ARRAY_SIZE(st_press_sensors),
st_press_sensors);
@@ -380,6 +406,8 @@
{
struct st_sensor_data *pdata = iio_priv(indio_dev);
+ st_press_power_disable(indio_dev);
+
iio_device_unregister(indio_dev);
if (pdata->get_irq_data_ready(indio_dev) > 0)
st_sensors_deallocate_trigger(indio_dev);
diff --git a/include/linux/iio/common/st_sensors.h b/include/linux/iio/common/st_sensors.h
index e732fda..968b84e 100644
--- a/include/linux/iio/common/st_sensors.h
+++ b/include/linux/iio/common/st_sensors.h
@@ -16,6 +16,7 @@
#include <linux/irqreturn.h>
#include <linux/iio/trigger.h>
#include <linux/bitops.h>
+#include <linux/regulator/consumer.h>
#include <linux/platform_data/st_sensors_pdata.h>
@@ -201,6 +202,7 @@
* @trig: The trigger in use by the core driver.
* @sensor: Pointer to the current sensor struct in use.
* @current_fullscale: Maximum range of measure by the sensor.
+ * @vdd: Pointer to sensor's Vdd power supply
* @enabled: Status of the sensor (false->off, true->on).
* @multiread_bit: Use or not particular bit for [I2C/SPI] multiread.
* @buffer_data: Data used by buffer part.
@@ -216,6 +218,7 @@
struct iio_trigger *trig;
struct st_sensors *sensor;
struct st_sensor_fullscale_avl *current_fullscale;
+ struct regulator *vdd;
bool enabled;
bool multiread_bit;