diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/regulator/mp8859.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/drivers/regulator/mp8859.c b/drivers/regulator/mp8859.c index 3e849e1a172f..ab105ffd6a2e 100644 --- a/drivers/regulator/mp8859.c +++ b/drivers/regulator/mp8859.c @@ -35,6 +35,8 @@ #define MP8859_GO_BIT 0x01 +#define MP8859_IOUT_LIM_MASK 0x7f + #define MP8859_ENABLE_MASK 0x80 #define MP8859_DISCHG_EN_MASK 0x10 #define MP8859_MODE_MASK 0x08 @@ -131,6 +133,58 @@ static int mp8859_set_mode(struct regulator_dev *rdev, unsigned int mode) MP8859_MODE_MASK, val); } +static int mp8859_set_current_limit(struct regulator_dev *rdev, + int min_uA, int max_uA) +{ + unsigned int cur_val, new_val; + int ret, i; + + /* Steps of 50mA */ + new_val = max_uA / 50000; + if (new_val > MP8859_IOUT_LIM_MASK) + return -EINVAL; + if (new_val == 0) + return -EINVAL; + + /* + * If the regulator is limiting then ramp gradually as per + * datasheet, otherwise just set the value directly. + */ + ret = regmap_read(rdev->regmap, MP8859_STATUS_REG, &cur_val); + if (ret != 0) + return ret; + if (!(cur_val & MP8859_CC_CV_MASK)) { + return regmap_update_bits(rdev->regmap, MP8859_IOUT_LIM_REG, + MP8859_IOUT_LIM_MASK, new_val); + } + + ret = regmap_read(rdev->regmap, MP8859_IOUT_LIM_REG, &cur_val); + if (ret != 0) + return ret; + + if (cur_val >= new_val) { + for (i = cur_val; i >= new_val; i--) { + ret = regmap_update_bits(rdev->regmap, + MP8859_IOUT_LIM_REG, + MP8859_IOUT_LIM_MASK, + cur_val - i); + if (ret != 0) + return ret; + } + } else { + for (i = cur_val; i <= new_val; i++) { + ret = regmap_update_bits(rdev->regmap, + MP8859_IOUT_LIM_REG, + MP8859_IOUT_LIM_MASK, + cur_val + i); + if (ret != 0) + return ret; + } + } + + return 0; +} + static int mp8859_get_status(struct regulator_dev *rdev) { unsigned int val; @@ -241,6 +295,7 @@ static const struct regulator_ops mp8859_ops = { .set_mode = mp8859_set_mode, .get_mode = mp8859_get_mode, .set_active_discharge = regulator_set_active_discharge_regmap, + .set_current_limit = mp8859_set_current_limit, .get_status = mp8859_get_status, .get_error_flags = mp8859_get_error_flags, }; |