diff options
Diffstat (limited to 'drivers/regulator/mp8859.c')
| -rw-r--r-- | drivers/regulator/mp8859.c | 252 |
1 files changed, 251 insertions, 1 deletions
diff --git a/drivers/regulator/mp8859.c b/drivers/regulator/mp8859.c index b820bd6043..ab105ffd6a 100644 --- a/drivers/regulator/mp8859.c +++ b/drivers/regulator/mp8859.c @@ -35,6 +35,16 @@ #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 + +#define MP8859_PG_MASK 0x80 +#define MP8859_OTP_MASK 0x40 +#define MP8859_OTW_MASK 0x20 +#define MP8859_CC_CV_MASK 0x10 static int mp8859_set_voltage_sel(struct regulator_dev *rdev, unsigned int sel) { @@ -73,21 +83,221 @@ static int mp8859_get_voltage_sel(struct regulator_dev *rdev) return val; } +static int mp8859_set_voltage_time_sel(struct regulator_dev *rdev, + unsigned int from, unsigned int to) +{ + int change; + + /* The voltage ramps at 1mV/uS, selectors are 10mV */ + if (from > to) + change = from - to; + else + change = to - from; + + return change * 10 * 1000; +} + +static unsigned int mp8859_get_mode(struct regulator_dev *rdev) +{ + unsigned int val; + int ret; + + ret = regmap_read(rdev->regmap, MP8859_CTL1_REG, &val); + if (ret != 0) { + dev_err(&rdev->dev, "Failed to read mode: %d\n", ret); + return 0; + } + + if (val & MP8859_MODE_MASK) + return REGULATOR_MODE_FAST; + else + return REGULATOR_MODE_NORMAL; +} + +static int mp8859_set_mode(struct regulator_dev *rdev, unsigned int mode) +{ + unsigned int val; + + switch (mode) { + case REGULATOR_MODE_FAST: + val = MP8859_MODE_MASK; + break; + case REGULATOR_MODE_NORMAL: + val = 0; + break; + default: + return -EINVAL; + } + + return regmap_update_bits(rdev->regmap, MP8859_CTL1_REG, + 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; + int ret; + + /* Output status is only meaingful when enabled */ + ret = regmap_read(rdev->regmap, MP8859_CTL1_REG, &val); + if (ret != 0) + return ret; + if (!(val & MP8859_ENABLE_MASK)) + return REGULATOR_STATUS_UNDEFINED; + + ret = regmap_read(rdev->regmap, MP8859_STATUS_REG, &val); + if (ret != 0) + return ret; + + if (val & MP8859_PG_MASK) + return REGULATOR_STATUS_ON; + else + return REGULATOR_STATUS_ERROR; +} + +static int mp8859_get_error_flags(struct regulator_dev *rdev, + unsigned int *flags) +{ + unsigned int status, enabled; + int ret; + + *flags = 0; + + /* Output status is only meaingful when enabled */ + ret = regmap_read(rdev->regmap, MP8859_CTL1_REG, &enabled); + if (ret != 0) + return ret; + enabled &= MP8859_ENABLE_MASK; + + ret = regmap_read(rdev->regmap, MP8859_STATUS_REG, &status); + if (ret != 0) + return ret; + + if (enabled && !(status & MP8859_PG_MASK)) + status |= REGULATOR_ERROR_FAIL; + if (status & MP8859_OTP_MASK) + status |= REGULATOR_ERROR_OVER_TEMP; + if (status & MP8859_OTW_MASK) + status |= REGULATOR_ERROR_OVER_TEMP_WARN; + if (status & MP8859_CC_CV_MASK) + status |= REGULATOR_ERROR_OVER_CURRENT; + + return 0; +} + static const struct linear_range mp8859_dcdc_ranges[] = { REGULATOR_LINEAR_RANGE(0, VOL_MIN_IDX, VOL_MAX_IDX, 10000), }; +static bool mp8859_readable(struct device *dev, unsigned int reg) +{ + switch (reg) { + case MP8859_VOUT_L_REG: + case MP8859_VOUT_H_REG: + case MP8859_VOUT_GO_REG: + case MP8859_IOUT_LIM_REG: + case MP8859_CTL1_REG: + case MP8859_CTL2_REG: + case MP8859_STATUS_REG: + case MP8859_INTERRUPT_REG: + case MP8859_MASK_REG: + case MP8859_ID1_REG: + case MP8859_MFR_ID_REG: + case MP8859_DEV_ID_REG: + case MP8859_IC_REV_REG: + return true; + default: + return false; + } +} + +static bool mp8859_volatile(struct device *dev, unsigned int reg) +{ + switch (reg) { + case MP8859_VOUT_GO_REG: + case MP8859_STATUS_REG: + case MP8859_INTERRUPT_REG: + return true; + default: + return false; + } +} + static const struct regmap_config mp8859_regmap = { .reg_bits = 8, .val_bits = 8, .max_register = MP8859_MAX_REG, - .cache_type = REGCACHE_RBTREE, + .cache_type = REGCACHE_MAPLE, + .readable_reg = mp8859_readable, + .volatile_reg = mp8859_volatile, }; static const struct regulator_ops mp8859_ops = { .set_voltage_sel = mp8859_set_voltage_sel, .get_voltage_sel = mp8859_get_voltage_sel, .list_voltage = regulator_list_voltage_linear_range, + .set_voltage_time_sel = mp8859_set_voltage_time_sel, + .enable = regulator_enable_regmap, + .disable = regulator_disable_regmap, + .is_enabled = regulator_is_enabled_regmap, + .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, }; static const struct regulator_desc mp8859_regulators[] = { @@ -100,6 +310,12 @@ static const struct regulator_desc mp8859_regulators[] = { .n_voltages = VOL_MAX_IDX + 1, .linear_ranges = mp8859_dcdc_ranges, .n_linear_ranges = 1, + .enable_reg = MP8859_CTL1_REG, + .enable_mask = MP8859_ENABLE_MASK, + .enable_val = MP8859_ENABLE_MASK, + .active_discharge_reg = MP8859_CTL1_REG, + .active_discharge_on = MP8859_DISCHG_EN_MASK, + .active_discharge_mask = MP8859_DISCHG_EN_MASK, .ops = &mp8859_ops, .owner = THIS_MODULE, }, @@ -111,12 +327,46 @@ static int mp8859_i2c_probe(struct i2c_client *i2c) struct regulator_config config = {.dev = &i2c->dev}; struct regmap *regmap = devm_regmap_init_i2c(i2c, &mp8859_regmap); struct regulator_dev *rdev; + unsigned int val, rev; if (IS_ERR(regmap)) { ret = PTR_ERR(regmap); dev_err(&i2c->dev, "regmap init failed: %d\n", ret); return ret; } + + ret = regmap_read(regmap, MP8859_MFR_ID_REG, &val); + if (ret != 0) { + dev_err(&i2c->dev, "Failed to read manufacturer ID: %d\n", ret); + return ret; + } + if (val != 0x9) { + dev_err(&i2c->dev, "Manufacturer ID %x != 9\n", val); + return -EINVAL; + } + + ret = regmap_read(regmap, MP8859_DEV_ID_REG, &val); + if (ret != 0) { + dev_err(&i2c->dev, "Failed to read device ID: %d\n", ret); + return ret; + } + if (val != 0x58) { + dev_err(&i2c->dev, "Manufacturer ID %x != 0x58\n", val); + return -EINVAL; + } + + ret = regmap_read(regmap, MP8859_IC_REV_REG, &rev); + if (ret != 0) { + dev_err(&i2c->dev, "Failed to read device revision: %d\n", ret); + return ret; + } + ret = regmap_read(regmap, MP8859_ID1_REG, &val); + if (ret != 0) { + dev_err(&i2c->dev, "Failed to read device ID1: %d\n", ret); + return ret; + } + dev_info(&i2c->dev, "MP8859-%04d revision %d\n", val, rev); + rdev = devm_regulator_register(&i2c->dev, &mp8859_regulators[0], &config); |