iio: hid-sensors: ALS: Raw read support

Added support for raw reading of channel. If the sensor is powered
off, it will turn on for reading value.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 19 insertions, 5 deletions

diff --git a/drivers/iio/light/hid-sensor-als.c b/drivers/iio/light/hid-sensor-als.c
index e124b395f320..f34c94380b41 100644
--- a/drivers/iio/light/hid-sensor-als.c
+++ b/drivers/iio/light/hid-sensor-als.c
@@ -22,6 +22,7 @@
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/slab.h>
+#include <linux/delay.h>
 #include <linux/hid-sensor-hub.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -49,6 +50,7 @@ static const struct iio_chan_spec als_channels[] = {
                 .type = IIO_INTENSITY,
                 .modified = 1,
                 .channel2 = IIO_MOD_LIGHT_BOTH,
+                .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
                 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
                 BIT(IIO_CHAN_INFO_SCALE) |
                 BIT(IIO_CHAN_INFO_SAMP_FREQ) |
@@ -79,6 +81,7 @@ static int als_read_raw(struct iio_dev *indio_dev,
         u32 address;
         int ret;
         int ret_type;
+        s32 poll_value;
 
         *val = 0;
         *val2 = 0;
@@ -94,12 +97,23 @@ static int als_read_raw(struct iio_dev *indio_dev,
                         report_id = -1;
                         break;
                 }
-                if (report_id >= 0)
+                if (report_id >= 0) {
+                        poll_value = hid_sensor_read_poll_value(
+                                                &als_state->common_attributes);
+                        if (poll_value < 0)
+                                return -EINVAL;
+
+                        hid_sensor_power_state(&als_state->common_attributes,
+                                                true);
+                        msleep_interruptible(poll_value * 2);
+
                         *val = sensor_hub_input_attr_get_raw_value(
-                                als_state->common_attributes.hsdev,
-                                HID_USAGE_SENSOR_ALS, address,
-                                report_id);
-                else {
+                                        als_state->common_attributes.hsdev,
+                                        HID_USAGE_SENSOR_ALS, address,
+                                        report_id);
+                        hid_sensor_power_state(&als_state->common_attributes,
+                                                false);
+                } else {
                         *val = 0;
                         return -EINVAL;
                 }