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Subject[PATCH V4 08/10] regulator: da9121: add current support
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>
---
drivers/regulator/da9121-regulator.c | 113 +++++++++++++++++++++++++++++++++++
1 file changed, 113 insertions(+)

diff --git a/drivers/regulator/da9121-regulator.c b/drivers/regulator/da9121-regulator.c
index 6c82441..a69acb2 100644
--- a/drivers/regulator/da9121-regulator.c
+++ b/drivers/regulator/da9121-regulator.c
@@ -91,6 +91,117 @@ struct da9121_variant_info {
{ 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 @@ struct da9121_variant_info {
.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[] = {
--
1.9.1
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