The patch titled lis3lv02d: proper power on sequence has been added to the -mm tree. Its filename is lis3lv02d-proper-power-on-sequence.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: lis3lv02d: proper power on sequence From: Samu Onkalo <samu.p.onkalo@xxxxxxxxx> 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@xxxxxxxxx> Tested-by: Éric Piel <eric.piel@xxxxxxxxxxxxxxxx> Acked-by: Éric Piel <eric.piel@xxxxxxxxxxxxxxxx> Cc: Pavel Machek <pavel@xxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/hwmon/lis3lv02d.c | 41 +++++++++++++++++++++++------------- drivers/hwmon/lis3lv02d.h | 1 2 files changed, 28 insertions(+), 14 deletions(-) diff -puN drivers/hwmon/lis3lv02d.c~lis3lv02d-proper-power-on-sequence drivers/hwmon/lis3lv02d.c --- a/drivers/hwmon/lis3lv02d.c~lis3lv02d-proper-power-on-sequence +++ a/drivers/hwmon/lis3lv02d.c @@ -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 lis *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->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 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 lis3lv0 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 diff -puN drivers/hwmon/lis3lv02d.h~lis3lv02d-proper-power-on-sequence drivers/hwmon/lis3lv02d.h --- a/drivers/hwmon/lis3lv02d.h~lis3lv02d-proper-power-on-sequence +++ a/drivers/hwmon/lis3lv02d.h @@ -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 */ _ Patches currently in -mm which might be from samu.p.onkalo@xxxxxxxxx are linux-next.patch lis3lv02d-axis-remap-and-resource-setup-release.patch lis3lv02d-i2c-support.patch lis3lv02d-send-sync-event.patch lis3lv02d-correct-memory-leak-in-module-unload.patch lis3-update-documentation-and-comments.patch lis3-fix-show-rate-for-8-bits-chips.patch lis3lv02d-proper-power-on-sequence.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html