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>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/iio/pressure/st_pressure_core.c b/drivers/iio/pressure/st_pressure_core.c
index 2da411b6925b..baeab109f41d 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 @@ static const struct iio_trigger_ops st_press_trigger_ops = {
 #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 @@ int st_press_common_probe(struct iio_dev *indio_dev,
         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 @@ void st_press_common_remove(struct iio_dev *indio_dev)
 {
         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);