linux-kernel - [PATCH v2 08/10] lis3: Sysfs entry for setting chip measurement rate

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Date:	Tue, 10 Nov 2009 14:41:10 +0200
From:	Samu Onkalo <samu.p.onkalo@...ia.com>
To:	eric.piel@...mplin-utc.net, daniel@...aq.de, pavel@....cz
Cc:	linux-kernel@...r.kernel.org, lm-sensors@...sensors.org,
	Samu Onkalo <samu.p.onkalo@...ia.com>
Subject: [PATCH v2 08/10] lis3: Sysfs entry for setting chip measurement rate

It is possible to read position information at the chip measurement
rate via sysfs. This patch adds possibility to configure chip
measurement rate.

Signed-off-by: Samu Onkalo <samu.p.onkalo@...ia.com>
---
 drivers/hwmon/lis3lv02d.c |   49 ++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 48 insertions(+), 1 deletions(-)

diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
index 5b39257..be2eb97 100644
--- a/drivers/hwmon/lis3lv02d.c
+++ b/drivers/hwmon/lis3lv02d.c
@@ -133,6 +133,37 @@ static int lis3lv02d_get_odr(void)
 	return val;
 }
 
+static int lis3lv02d_set_odr(int rate)
+{
+	u8 ctrl;
+	int i, len, shift;
+	int *rates;
+	int ret = -EINVAL;
+
+	lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
+
+	if (lis3_dev.whoami == WAI_12B) {
+		len = sizeof(lis3_12_rates);
+		rates = lis3_12_rates;
+		shift = 4;
+		ctrl &= ~(CTRL1_DF0 | CTRL1_DF1);
+	} else {
+		len = sizeof(lis3_8_rates);
+		rates = lis3_8_rates;
+		shift = 7;
+		ctrl &= ~CTRL1_DR;
+	}
+
+	for (i = 0; i < len; i++)
+		if (rates[i] == rate) {
+			lis3_dev.write(&lis3_dev,
+				CTRL_REG1, ctrl | (i << shift));
+			ret = 0;
+			break;
+		}
+	return ret;
+}
+
 static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
 {
 	u8 reg;
@@ -427,9 +458,25 @@ static ssize_t lis3lv02d_rate_show(struct device *dev,
 	return sprintf(buf, "%d\n", lis3lv02d_get_odr());
 }
 
+static ssize_t lis3lv02d_rate_set(struct device *dev,
+				struct device_attribute *attr, const char *buf,
+				size_t count)
+{
+	unsigned long rate;
+
+	if (strict_strtoul(buf, 0, &rate))
+		return -EINVAL;
+
+	if (lis3lv02d_set_odr(rate))
+		return -EINVAL;
+
+	return count;
+}
+
 static DEVICE_ATTR(selftest, S_IRUGO, lis3lv02d_selftest_show, NULL);
 static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
-static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL);
+static DEVICE_ATTR(rate, S_IRUGO | S_IWUSR, lis3lv02d_rate_show,
+					    lis3lv02d_rate_set);
 
 static struct attribute *lis3lv02d_attributes[] = {
 	&dev_attr_selftest.attr,
-- 
1.5.6.3

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