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drivers: regulator: pca9420: implement active discharge api
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Implement the api for controlling the active discharge setting within
the pca9420.

Signed-off-by: Ryan McClelland <ryanmcclelland@meta.com>
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@XenuIsWatching
XenuIsWatching committed Jan 24, 2024
1 parent 764d8cb commit 005eab9
Showing 1 changed file with 56 additions and 0 deletions.
56 changes: 56 additions & 0 deletions drivers/regulator/regulator_pca9420.c
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,8 @@
#define PCA9420_TOP_CNTL3 0x0CU

/** Regulator status indication registers */
/** @brief Active Discharge configuration for mode 0_0 */
#define PCA9420_ACT_DISCHARGE_CNTL 0x21U
/** @brief Mode configuration for mode 0_0 */
#define PCA9420_MODECFG_0_0 0x22U
/** @brief Mode configuration for mode 0_1 */
Expand Down Expand Up @@ -81,6 +83,18 @@
/** @brief LDO2_OUT offset and voltage level mask */
#define PCA9420_MODECFG_3_LDO2_OUT_MASK 0x3FU
#define PCA9420_MODECFG_3_LDO2_OUT_POS 0U
/** @brief SW1 active discharge control */
#define PCA9420_ACT_DISCHARGE_CNTL_SW1_MASK 0x08U
#define PCA9420_ACT_DISCHARGE_CNTL_SW1_POS 4U
/** @brief SW2 active discharge control */
#define PCA9420_ACT_DISCHARGE_CNTL_SW2_MASK 0x04U
#define PCA9420_ACT_DISCHARGE_CNTL_SW2_POS 3U
/** @brief LDO1 active discharge control */
#define PCA9420_ACT_DISCHARGE_CNTL_LDO1_MASK 0x02U
#define PCA9420_ACT_DISCHARGE_CNTL_LDO1_POS 2U
/** @brief LDO2 active discharge control */
#define PCA9420_ACT_DISCHARGE_CNTL_LDO2_MASK 0x01U
#define PCA9420_ACT_DISCHARGE_CNTL_LDO2_POS 1U

/** VIN ILIM resolution, uA/LSB */
#define PCA9420_VIN_ILIM_UA_LSB 170000
Expand All @@ -99,6 +113,8 @@ struct regulator_pca9420_desc {
uint8_t vsel_reg;
uint8_t vsel_mask;
uint8_t vsel_pos;
uint8_t ad_mask;
uint8_t ad_pos;
int32_t max_ua;
uint8_t num_ranges;
const struct linear_range *ranges;
Expand Down Expand Up @@ -159,6 +175,8 @@ static const struct regulator_pca9420_desc buck1_desc = {
.vsel_mask = PCA9420_MODECFG_0_SW1_OUT_MASK,
.vsel_pos = PCA9420_MODECFG_0_SW1_OUT_POS,
.vsel_reg = PCA9420_MODECFG_0_0,
.ad_mask = PCA9420_ACT_DISCHARGE_CNTL_SW1_MASK,
.ad_pos = PCA9420_ACT_DISCHARGE_CNTL_SW1_POS,
.max_ua = 250000,
.ranges = buck1_ranges,
.num_ranges = ARRAY_SIZE(buck1_ranges),
Expand All @@ -171,6 +189,8 @@ static const struct regulator_pca9420_desc buck2_desc = {
.vsel_mask = PCA9420_MODECFG_1_SW2_OUT_MASK,
.vsel_pos = PCA9420_MODECFG_1_SW2_OUT_POS,
.vsel_reg = PCA9420_MODECFG_0_1,
.ad_mask = PCA9420_ACT_DISCHARGE_CNTL_SW2_MASK,
.ad_pos = PCA9420_ACT_DISCHARGE_CNTL_SW2_POS,
.max_ua = 500000,
.ranges = buck2_ranges,
.num_ranges = ARRAY_SIZE(buck2_ranges),
Expand All @@ -183,6 +203,8 @@ static const struct regulator_pca9420_desc ldo1_desc = {
.vsel_mask = PCA9420_MODECFG_2_LDO1_OUT_MASK,
.vsel_pos = PCA9420_MODECFG_2_LDO1_OUT_POS,
.vsel_reg = PCA9420_MODECFG_0_2,
.ad_mask = PCA9420_ACT_DISCHARGE_CNTL_LDO1_MASK,
.ad_pos = PCA9420_ACT_DISCHARGE_CNTL_LDO1_POS,
.max_ua = 1000,
.ranges = ldo1_ranges,
.num_ranges = ARRAY_SIZE(ldo1_ranges),
Expand All @@ -195,6 +217,8 @@ static const struct regulator_pca9420_desc ldo2_desc = {
.vsel_reg = PCA9420_MODECFG_0_3,
.vsel_mask = PCA9420_MODECFG_3_LDO2_OUT_MASK,
.vsel_pos = PCA9420_MODECFG_3_LDO2_OUT_POS,
.ad_mask = PCA9420_ACT_DISCHARGE_CNTL_LDO2_MASK,
.ad_pos = PCA9420_ACT_DISCHARGE_CNTL_LDO2_POS,
.max_ua = 250000,
.ranges = ldo2_ranges,
.num_ranges = ARRAY_SIZE(ldo2_ranges),
Expand Down Expand Up @@ -279,6 +303,36 @@ static int regulator_pca9420_get_current_limit(const struct device *dev,
return 0;
}

static int regulator_pca9420_set_active_discharge(const struct device *dev,
bool active_discharge)
{
const struct regulator_pca9420_config *config = dev->config;
const struct regulator_pca9420_common_config *cconfig = config->parent->config;
uint8_t dis_val;

dis_val = (!active_discharge) << config->desc->ad_pos;
return i2c_reg_update_byte_dt(&cconfig->i2c, PCA9420_ACT_DISCHARGE_CNTL,
config->desc->ad_mask, dis_val);
}

static int regulator_pca9420_get_active_discharge(const struct device *dev,
bool *active_discharge)
{
const struct regulator_pca9420_config *config = dev->config;
const struct regulator_pca9420_common_config *cconfig = config->parent->config;
uint8_t raw_reg;
int ret;

ret = i2c_reg_read_byte_dt(&cconfig->i2c, PCA9420_ACT_DISCHARGE_CNTL, &raw_reg);
if (ret < 0) {
return ret;
}

*active_discharge = !((raw_reg & config->desc->ad_mask) >> config->desc->ad_pos);

return 0;
}

static int regulator_pca9420_enable(const struct device *dev)
{
const struct regulator_pca9420_config *config = dev->config;
Expand Down Expand Up @@ -313,6 +367,8 @@ static const struct regulator_driver_api api = {
.set_voltage = regulator_pca9420_set_voltage,
.get_voltage = regulator_pca9420_get_voltage,
.get_current_limit = regulator_pca9420_get_current_limit,
.set_active_discharge = regulator_pca9420_set_active_discharge,
.get_active_discharge = regulator_pca9420_get_active_discharge,
};

static int regulator_pca9420_init(const struct device *dev)
Expand Down

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