linux-kernel - [PATCH 04/19] bh1770glc: Added raw lux output file for ALS to sysfs

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Message-Id: <3621e6eb47c287eeffaef7bf68521d0d1740a296.1371145891.git.andi@etezian.org>
Date:	Thu, 13 Jun 2013 20:20:38 +0200
From:	Andi Shyti <andi@...zian.org>
To:	arnd@...db.de, gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, pc@...f.org, oatilla@...il.com,
	andi@...zian.org
Subject: [PATCH 04/19] bh1770glc: Added raw lux output file for ALS to sysfs

From: Onur Atilla <oatilla@...il.com>

"lux0_raw" file gives the raw Ambient Light Sensor (ALS) value,
before adjusting it with the calibration coefficients, whereas
"lux0_input"returns the calibrated ALS value.

Signed-off-by: Onur Atilla <oatilla@...il.com>
Signed-off-by: Andi Shyti <andi@...zian.org>
---
 drivers/misc/bh1770glc.c |   31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/misc/bh1770glc.c b/drivers/misc/bh1770glc.c
index 82c30e7..d8d6526 100644
--- a/drivers/misc/bh1770glc.c
+++ b/drivers/misc/bh1770glc.c
@@ -395,6 +395,12 @@ static int bh1770_lux_read_result(struct bh1770_chip *chip)
 	return bh1770_lux_raw_to_adjusted(chip, chip->lux_data_raw);
 }
 
+static int bh1770_lux_read_raw_result(struct bh1770_chip *chip)
+{
+	bh1770_lux_get_result(chip);
+	return chip->lux_data_raw;
+}
+
 /*
  * Chip on / off functions are called while keeping mutex except probe
  * or remove phase
@@ -725,6 +731,29 @@ static ssize_t bh1770_lux_result_show(struct device *dev,
 	return ret;
 }
 
+static ssize_t bh1770_lux_raw_result_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct bh1770_chip *chip =  dev_get_drvdata(dev);
+	ssize_t ret;
+	long timeout;
+
+	if (pm_runtime_suspended(dev))
+		return -EIO; /* Chip is not enabled at all */
+
+	timeout = wait_event_interruptible_timeout(chip->wait,
+					!chip->lux_wait_result,
+					msecs_to_jiffies(BH1770_TIMEOUT));
+	if (!timeout)
+		return -EIO;
+
+	mutex_lock(&chip->mutex);
+	ret = sprintf(buf, "%d\n", bh1770_lux_read_raw_result(chip));
+	mutex_unlock(&chip->mutex);
+
+	return ret;
+}
+
 static ssize_t bh1770_lux_range_show(struct device *dev,
 				   struct device_attribute *attr, char *buf)
 {
@@ -1184,6 +1213,7 @@ static DEVICE_ATTR(lux0_glass_factor, S_IRUGO, bh1770_lux_glass_factor_show,
 						NULL);
 static DEVICE_ATTR(lux0_sensor_comp_factor, S_IRUGO, bh1770_lux_scf_show, NULL);
 static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
+static DEVICE_ATTR(lux0_raw, S_IRUGO, bh1770_lux_raw_result_show, NULL);
 static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
 static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
 						bh1770_set_lux_rate);
@@ -1205,6 +1235,7 @@ static struct attribute *sysfs_attrs[] = {
 	&dev_attr_lux0_glass_factor.attr,
 	&dev_attr_lux0_sensor_comp_factor.attr,
 	&dev_attr_lux0_input.attr,
+	&dev_attr_lux0_raw.attr,
 	&dev_attr_lux0_sensor_range.attr,
 	&dev_attr_lux0_rate.attr,
 	&dev_attr_lux0_rate_avail.attr,
-- 
1.7.10.4

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