diff options
| author | Chethan Krishna N <chethan.krishna@stericsson.com> | 2011-03-08 15:18:34 +0530 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@stericsson.com> | 2011-09-19 15:14:54 +0200 |
| commit | 7c747beb07d35ef8d7e056fc10dcc524b614353f (patch) | |
| tree | c018f0b3188ba1713e46d8c12ed7b593da300234 /drivers/hwmon | |
| parent | 599e33b736effe251c0a3a2080ba10e1661946f7 (diff) | |
lsm303dlh: Reboot memory content after suspend/resume
It is observed that device screen orientation doesn't behave
as expected sometimes after suspend/resume. Rebooting the device's
internal registers to ensure good device behavior.
ST Ericsson ID : ER327596
Signed-off-by: Chethan Krishna N <chethan.krishna@stericsson.com>
Change-Id: I6bdecf0959a3497b00d57d907d5a7a7d67b12c32
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/17814
Reviewed-by: Srinidhi KASAGAR <srinidhi.kasagar@stericsson.com>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/lsm303dlh_a.c | 25 |
1 files changed, 20 insertions, 5 deletions
diff --git a/drivers/hwmon/lsm303dlh_a.c b/drivers/hwmon/lsm303dlh_a.c index bbcf1663061..307a07cb031 100644 --- a/drivers/hwmon/lsm303dlh_a.c +++ b/drivers/hwmon/lsm303dlh_a.c @@ -324,6 +324,8 @@ static int lsm303dlh_a_restore(struct lsm303dlh_a_data *ddata) goto fail; fail: + /* write to the boot bit to reboot memory content */ + lsm303dlh_a_write(ddata, CTRL_REG2, 0x80, "CTRL_REG2"); mutex_unlock(&ddata->lock); return ret; } @@ -757,6 +759,7 @@ static ssize_t lsm303dlh_a_store_mode(struct device *dev, long val; unsigned char data; int error; + bool set_boot_bit = false; error = strict_strtol(buf, 0, &val); if (error) @@ -771,11 +774,15 @@ static ssize_t lsm303dlh_a_store_mode(struct device *dev, return -EINVAL; } - if (ddata->device_status == DEVICE_SUSPENDED && - val == LSM303DLH_A_MODE_OFF) { - ddata->mode = val; - mutex_unlock(&ddata->lock); - return 0; + if (ddata->device_status == DEVICE_SUSPENDED) { + if (val == LSM303DLH_A_MODE_OFF) { + ddata->mode = val; + mutex_unlock(&ddata->lock); + return 0; + } else { + /* device is turning on after suspend, reset memory */ + set_boot_bit = true; + } } /* if same mode as existing, return */ @@ -814,6 +821,14 @@ static ssize_t lsm303dlh_a_store_mode(struct device *dev, return error; } + /* + * Power on request when device is in suspended state + * write to the boot bit in CTRL_REG2 to reboot memory content + * and ensure correct device behavior after it resumes + */ + if (set_boot_bit) + lsm303dlh_a_write(ddata, CTRL_REG2, 0x80, "CTRL_REG2"); + if (val == LSM303DLH_A_MODE_OFF) { #ifdef CONFIG_SENSORS_LSM303DLH_INPUT_DEVICE disable_irq(gpio_to_irq(ddata->pdata.irq_a1)); |