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Date: Tue, 10 Nov 2009 14:41:08 +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 06/10] LIS3LV02D: Selftest support
Selftest as specified by chip manufacturer.
Controlled via sysfs. Response is OK / FAIL with measurement data for
each axes. test acceptance limits are set using platform data.
Signed-off-by: Samu Onkalo <samu.p.onkalo@...ia.com>
---
drivers/hwmon/lis3lv02d.c | 59 ++++++++++++++++++++++++++++++++++++++++++++-
drivers/hwmon/lis3lv02d.h | 13 ++++++++-
include/linux/lis3lv02d.h | 2 +
3 files changed, 71 insertions(+), 3 deletions(-)
diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
index 39b9ac8..0335b36 100644
--- a/drivers/hwmon/lis3lv02d.c
+++ b/drivers/hwmon/lis3lv02d.c
@@ -133,6 +133,51 @@ static int lis3lv02d_get_odr(void)
return val;
}
+static int lis3lv02d_selftest(struct lis3lv02d *lis3, s16 results[3])
+{
+ u8 reg;
+ s16 x, y, z;
+ u8 selftest;
+
+ if (lis3_dev.whoami == WAI_12B)
+ selftest = CTRL1_ST;
+ else
+ selftest = CTRL1_STP;
+
+ lis3->read(lis3, CTRL_REG1, ®);
+ lis3->write(lis3, CTRL_REG1, (reg | selftest));
+ msleep(lis3->pwron_delay / lis3lv02d_get_odr());
+
+ /* Read directly to avoid axis remap */
+ x = lis3->read_data(lis3, OUTX);
+ y = lis3->read_data(lis3, OUTY);
+ z = lis3->read_data(lis3, OUTZ);
+
+ /* back to normal settings */
+ lis3->write(lis3, CTRL_REG1, reg);
+ msleep(lis3->pwron_delay / lis3lv02d_get_odr());
+
+ results[0] = x - lis3->read_data(lis3, OUTX);
+ results[1] = y - lis3->read_data(lis3, OUTY);
+ results[2] = z - lis3->read_data(lis3, OUTZ);
+
+ if (lis3->pdata) {
+ int i;
+ for (i = 0; i < 3; i++) {
+ /* Check minimum acceptance limits */
+ if (results[i] < lis3->pdata->selftest_min_limits[i])
+ return -1;
+
+ /* Check maximum acceptance limits */
+ if (results[i] > lis3->pdata->selftest_max_limits[i])
+ return -1;
+ }
+ }
+
+ /* test passed */
+ return 0;
+}
+
void lis3lv02d_poweroff(struct lis3lv02d *lis3)
{
/* disable X,Y,Z axis and power down */
@@ -365,6 +410,17 @@ void lis3lv02d_joystick_disable(void)
EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
/* Sysfs stuff */
+static ssize_t lis3lv02d_selftest_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ int result;
+ s16 values[3];
+
+ result = lis3lv02d_selftest(&lis3_dev, values);
+ return sprintf(buf, "%s %d %d %d\n", result == 0 ? "OK" : "FAIL",
+ values[0], values[1], values[2]);
+}
+
static ssize_t lis3lv02d_position_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
@@ -394,12 +450,14 @@ static ssize_t lis3lv02d_rate_show(struct device *dev,
return sprintf(buf, "%d\n", lis3lv02d_get_odr());
}
+static DEVICE_ATTR(selftest, S_IRUGO, lis3lv02d_selftest_show, NULL);
static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
static DEVICE_ATTR(calibrate, S_IRUGO|S_IWUSR, lis3lv02d_calibrate_show,
lis3lv02d_calibrate_store);
static DEVICE_ATTR(rate, S_IRUGO, lis3lv02d_rate_show, NULL);
static struct attribute *lis3lv02d_attributes[] = {
+ &dev_attr_selftest.attr,
&dev_attr_position.attr,
&dev_attr_calibrate.attr,
&dev_attr_rate.attr,
@@ -507,4 +565,3 @@ EXPORT_SYMBOL_GPL(lis3lv02d_init_device);
MODULE_DESCRIPTION("ST LIS3LV02Dx three-axis digital accelerometer driver");
MODULE_AUTHOR("Yan Burman, Eric Piel, Pavel Machek");
MODULE_LICENSE("GPL");
-
diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index c57f21f..655875e 100644
--- a/drivers/hwmon/lis3lv02d.h
+++ b/drivers/hwmon/lis3lv02d.h
@@ -98,7 +98,7 @@ enum lis3_who_am_i {
WAI_6B = 0x52, /* 6 bits: LIS331DLF - not supported */
};
-enum lis3lv02d_ctrl1 {
+enum lis3lv02d_ctrl1_12b {
CTRL1_Xen = 0x01,
CTRL1_Yen = 0x02,
CTRL1_Zen = 0x04,
@@ -107,8 +107,17 @@ enum lis3lv02d_ctrl1 {
CTRL1_DF1 = 0x20,
CTRL1_PD0 = 0x40,
CTRL1_PD1 = 0x80,
- CTRL1_DR = 0x80, /* Data rate on 8 bits */
};
+
+/* Delta to ctrl1_12b version */
+enum lis3lv02d_ctrl1_8b {
+ CTRL1_STM = 0x08,
+ CTRL1_STP = 0x10,
+ CTRL1_FS = 0x20,
+ CTRL1_PD = 0x40,
+ CTRL1_DR = 0x80,
+};
+
enum lis3lv02d_ctrl2 {
CTRL2_DAS = 0x01,
CTRL2_SIM = 0x02,
diff --git a/include/linux/lis3lv02d.h b/include/linux/lis3lv02d.h
index 3cc2f2c..966648b 100644
--- a/include/linux/lis3lv02d.h
+++ b/include/linux/lis3lv02d.h
@@ -43,6 +43,8 @@ struct lis3lv02d_platform_data {
#define LIS3_WAKEUP_Z_HI (1 << 5)
unsigned char wakeup_flags;
unsigned char wakeup_thresh;
+ s16 selftest_min_limits[3]; /* x, y, z */
+ s16 selftest_max_limits[3]; /* x, y, z */
};
#endif /* __LIS3LV02D_H_ */
--
1.5.6.3
--
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