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regulator: da9121: add current support

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This commit adds support for getting/setting current for all supported
variants. Limits are adjusted per variant to match HW implementation.

Signed-off-by: Adam Ward <Adam.Ward.opensource@diasemi.com>
Link: https://lore.kernel.org/r/9aa80b909893dbe609730919ed595c6a8ac26606.1606755367.git.Adam.Ward.opensource@diasemi.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Adam Ward 2020-11-30 16:59:12 +00:00 committed by Mark Brown
parent 9929900d18
commit 5c4b62af1d
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GPG Key ID: 24D68B725D5487D0
1 changed files with 113 additions and 0 deletions
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113
drivers/regulator/da9121-regulator.c
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@ -91,6 +91,117 @@ static const struct da9121_variant_info variant_parameters[] = {
{ 1, 2, &da9121_6A_2phase_current }, //DA9121_TYPE_DA9217
};
struct da9121_field {
unsigned int reg;
unsigned int msk;
};
static const struct da9121_field da9121_current_field[2] = {
{ DA9121_REG_BUCK_BUCK1_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
{ DA9xxx_REG_BUCK_BUCK2_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
};
static int da9121_get_current_limit(struct regulator_dev *rdev)
{
struct da9121 *chip = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
struct da9121_range *range =
variant_parameters[chip->variant_id].current_range;
unsigned int val = 0;
int ret = 0;
ret = regmap_read(chip->regmap, da9121_current_field[id].reg, &val);
if (ret < 0) {
dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
goto error;
}
if (val < range->reg_min) {
ret = -EACCES;
goto error;
}
if (val > range->reg_max) {
ret = -EINVAL;
goto error;
}
return range->val_min + (range->val_stp * (val - range->reg_min));
error:
return ret;
}
static int da9121_ceiling_selector(struct regulator_dev *rdev,
int min, int max,
unsigned int *selector)
{
struct da9121 *chip = rdev_get_drvdata(rdev);
struct da9121_range *range =
variant_parameters[chip->variant_id].current_range;
unsigned int level;
unsigned int i = 0;
unsigned int sel = 0;
int ret = 0;
if (range->val_min > max || range->val_max < min) {
dev_err(chip->dev,
"Requested current out of regulator capability\n");
ret = -EINVAL;
goto error;
}
level = range->val_max;
for (i = range->reg_max; i >= range->reg_min; i--) {
if (level <= max) {
sel = i;
break;
}
level -= range->val_stp;
}
if (level < min) {
dev_err(chip->dev,
"Best match falls below minimum requested current\n");
ret = -EINVAL;
goto error;
}
*selector = sel;
error:
return ret;
}
static int da9121_set_current_limit(struct regulator_dev *rdev,
int min_ua, int max_ua)
{
struct da9121 *chip = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
struct da9121_range *range =
variant_parameters[chip->variant_id].current_range;
unsigned int sel = 0;
int ret = 0;
if (min_ua < range->val_min ||
max_ua > range->val_max) {
ret = -EINVAL;
goto error;
}
ret = da9121_ceiling_selector(rdev, min_ua, max_ua, &sel);
if (ret < 0)
goto error;
ret = regmap_update_bits(chip->regmap,
da9121_current_field[id].reg,
da9121_current_field[id].msk,
(unsigned int)sel);
if (ret < 0)
dev_err(chip->dev, "Cannot update BUCK current limit, err: %d\n", ret);
error:
return ret;
}
static const struct regulator_ops da9121_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
@ -98,6 +209,8 @@ static const struct regulator_ops da9121_buck_ops = {
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.get_current_limit = da9121_get_current_limit,
.set_current_limit = da9121_set_current_limit,
};
static struct of_regulator_match da9121_matches[] = {