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lis3lv02d: proper power on sequence

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Lis3 accelerometer sensors have quite long power on delay (up to 125
ms). This patch adds necessary delay to power on sequence for currently
supported lis3 chips.

Signed-off-by: Samu Onkalo <samu.p.onkalo@nokia.com>
Tested-by: Éric Piel <eric.piel@tremplin-utc.net>
Acked-by: Éric Piel <eric.piel@tremplin-utc.net>
Cc: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Samu Onkalo 2009-12-14 18:01:41 -08:00 committed by Linus Torvalds
parent 4b5d95b380
commit 641615abfa
2 changed files with 28 additions and 14 deletions
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41
drivers/hwmon/lis3lv02d.c
View File

@ -50,6 +50,9 @@
* joystick.
*/
#define LIS3_PWRON_DELAY_WAI_12B (5000)
#define LIS3_PWRON_DELAY_WAI_8B (3000)
struct lis3lv02d lis3_dev = {
.misc_wait = __WAIT_QUEUE_HEAD_INITIALIZER(lis3_dev.misc_wait),
};
@ -112,6 +115,24 @@ static void lis3lv02d_get_xyz(struct lis3lv02d *lis3, int *x, int *y, int *z)
*z = lis3lv02d_get_axis(lis3->ac.z, position);
}
/* conversion btw sampling rate and the register values */
static int lis3_12_rates[4] = {40, 160, 640, 2560};
static int lis3_8_rates[2] = {100, 400};
static int lis3lv02d_get_odr(void)
{
u8 ctrl;
int val;
lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
if (lis3_dev.whoami == WAI_12B)
val = lis3_12_rates[(ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4];
else
val = lis3_8_rates[(ctrl & CTRL1_DR) >> 7];
return val;
}
void lis3lv02d_poweroff(struct lis3lv02d *lis3)
{
/* disable X,Y,Z axis and power down */
@ -125,6 +146,9 @@ void lis3lv02d_poweron(struct lis3lv02d *lis3)
lis3->init(lis3);
/* LIS3 power on delay is quite long */
msleep(lis3->pwron_delay / lis3lv02d_get_odr());
/*
* Common configuration
* BDU: (12 bits sensors only) LSB and MSB values are not updated until
@ -364,23 +388,10 @@ static ssize_t lis3lv02d_calibrate_store(struct device *dev,
return count;
}
/* conversion btw sampling rate and the register values */
static int lis3_12_rates[4] = {40, 160, 640, 2560};
static int lis3_8_rates[2] = {100, 400};
static ssize_t lis3lv02d_rate_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
u8 ctrl;
int val;
lis3_dev.read(&lis3_dev, CTRL_REG1, &ctrl);
if (lis3_dev.whoami == WAI_12B)
val = lis3_12_rates[(ctrl & (CTRL1_DF0 | CTRL1_DF1)) >> 4];
else
val = lis3_8_rates[(ctrl & CTRL1_DR) >> 7];
return sprintf(buf, "%d\n", val);
return sprintf(buf, "%d\n", lis3lv02d_get_odr());
}
static DEVICE_ATTR(position, S_IRUGO, lis3lv02d_position_show, NULL);
@ -430,11 +441,13 @@ int lis3lv02d_init_device(struct lis3lv02d *dev)
printk(KERN_INFO DRIVER_NAME ": 12 bits sensor found\n");
dev->read_data = lis3lv02d_read_12;
dev->mdps_max_val = 2048;
dev->pwron_delay = LIS3_PWRON_DELAY_WAI_12B;
break;
case WAI_8B:
printk(KERN_INFO DRIVER_NAME ": 8 bits sensor found\n");
dev->read_data = lis3lv02d_read_8;
dev->mdps_max_val = 128;
dev->pwron_delay = LIS3_PWRON_DELAY_WAI_8B;
break;
default:
printk(KERN_ERR DRIVER_NAME

1
drivers/hwmon/lis3lv02d.h
View File

@ -202,6 +202,7 @@ struct lis3lv02d {
u8 whoami; /* indicates measurement precision */
s16 (*read_data) (struct lis3lv02d *lis3, int reg);
int mdps_max_val;
int pwron_delay;
struct input_polled_dev *idev; /* input device */
struct platform_device *pdev; /* platform device */