From 371a12339a210561ca43f1ebcbc01fbdbcab9435 Mon Sep 17 00:00:00 2001
From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date: Sat, 19 Apr 2014 00:22:00 +0100
Subject: [PATCH] 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>
---
 drivers/iio/light/hid-sensor-als.c | 24 +++++++++++++++++++-----
 1 file 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;
 		}