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authorAxel Lin <axel.lin@ingics.com>2013-03-28 13:23:00 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-03-29 21:52:55 +0400
commit742a73259d2d07ad6870736749aa8d6821ed96d9 (patch)
tree611eec8737682846eecd01c2049b30513d561aba
parentda0b0c47dcfd92317e2ece4c3434e1f82b55cf8a (diff)
downloadlinux-742a73259d2d07ad6870736749aa8d6821ed96d9.tar.xz
regulator: ab8500: Update info->update_val only when successfully update register
Don't update info->update_val if write to the register fails. Signed-off-by: Axel Lin <axel.lin@ingics.com> Acked-by: Bengt Jonsson <bengt.g.jonsson@stericsson.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
-rw-r--r--drivers/regulator/ab8500.c27
1 files changed, 19 insertions, 8 deletions
diff --git a/drivers/regulator/ab8500.c b/drivers/regulator/ab8500.c
index bf34c4cd6631..c7b433a2a3a9 100644
--- a/drivers/regulator/ab8500.c
+++ b/drivers/regulator/ab8500.c
@@ -184,8 +184,8 @@ static unsigned int ab8500_regulator_get_optimum_mode(
static int ab8500_regulator_set_mode(struct regulator_dev *rdev,
unsigned int mode)
{
- int ret = 0;
-
+ int ret;
+ u8 update_val;
struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
if (info == NULL) {
@@ -195,31 +195,42 @@ static int ab8500_regulator_set_mode(struct regulator_dev *rdev,
switch (mode) {
case REGULATOR_MODE_NORMAL:
- info->update_val = info->update_val_normal;
+ update_val = info->update_val_normal;
break;
case REGULATOR_MODE_IDLE:
- info->update_val = info->update_val_idle;
+ update_val = info->update_val_idle;
break;
default:
return -EINVAL;
}
+ /* ab8500 regulators share mode and enable in the same register bits.
+ off = 0b00
+ low power mode= 0b11
+ full powermode = 0b01
+ (HW control mode = 0b10)
+ Thus we don't write to the register when regulator is disabled.
+ */
if (info->is_enabled) {
ret = abx500_mask_and_set_register_interruptible(info->dev,
info->update_bank, info->update_reg,
- info->update_mask, info->update_val);
- if (ret < 0)
+ info->update_mask, update_val);
+ if (ret < 0) {
dev_err(rdev_get_dev(rdev),
"couldn't set regulator mode\n");
+ return ret;
+ }
dev_vdbg(rdev_get_dev(rdev),
"%s-set_mode (bank, reg, mask, value): "
"0x%x, 0x%x, 0x%x, 0x%x\n",
info->desc.name, info->update_bank, info->update_reg,
- info->update_mask, info->update_val);
+ info->update_mask, update_val);
}
- return ret;
+ info->update_val = update_val;
+
+ return 0;
}
static unsigned int ab8500_regulator_get_mode(struct regulator_dev *rdev)