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regulator: max8998: Add charger regulator 

The max8998 has a current regulator for charging control.  The
charger driver in drivers/power/supply/max8998_charger.c has a
comment in it stating that 'charger control is done by a current
regulator "CHARGER"', but this regulator was never added until
now.

The current values have been extracted from a downstream driver
for the SGH-T959V.

Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Link: https://lore.kernel.org/r/BN6PR04MB0660E1F4A3D5A348BE88311CA3BA0@BN6PR04MB0660.namprd04.prod.outlook.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jonathan Bakker 2020-05-16 12:47:59 -07:00 committed by Mark Brown
parent a24490e017
commit 4ffea5e083
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 106 additions and 0 deletions
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105
drivers/regulator/max8998.c
View File

@ -33,6 +33,10 @@ struct max8998_data {
unsigned int buck2_idx;
};
static const unsigned int charger_current_table[] = {
90000, 380000, 475000, 550000, 570000, 600000, 700000, 800000,
};
static int max8998_get_enable_register(struct regulator_dev *rdev,
int *reg, int *shift)
{
@ -63,6 +67,10 @@ static int max8998_get_enable_register(struct regulator_dev *rdev,
*reg = MAX8998_REG_CHGR2;
*shift = 7 - (ldo - MAX8998_ESAFEOUT1);
break;
case MAX8998_CHARGER:
*reg = MAX8998_REG_CHGR2;
*shift = 0;
break;
default:
return -EINVAL;
}
@ -88,6 +96,11 @@ static int max8998_ldo_is_enabled(struct regulator_dev *rdev)
return val & (1 << shift);
}
static int max8998_ldo_is_enabled_inverted(struct regulator_dev *rdev)
{
return (!max8998_ldo_is_enabled(rdev));
}
static int max8998_ldo_enable(struct regulator_dev *rdev)
{
struct max8998_data *max8998 = rdev_get_drvdata(rdev);
@ -358,6 +371,74 @@ static int max8998_set_voltage_buck_time_sel(struct regulator_dev *rdev,
return 0;
}
int max8998_set_current_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
struct max8998_data *max8998 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8998->iodev->i2c;
unsigned int n_currents = rdev->desc->n_current_limits;
int i, sel = -1;
if (n_currents == 0)
return -EINVAL;
if (rdev->desc->curr_table) {
const unsigned int *curr_table = rdev->desc->curr_table;
bool ascend = curr_table[n_currents - 1] > curr_table[0];
/* search for closest to maximum */
if (ascend) {
for (i = n_currents - 1; i >= 0; i--) {
if (min_uA <= curr_table[i] &&
curr_table[i] <= max_uA) {
sel = i;
break;
}
}
} else {
for (i = 0; i < n_currents; i++) {
if (min_uA <= curr_table[i] &&
curr_table[i] <= max_uA) {
sel = i;
break;
}
}
}
}
if (sel < 0)
return -EINVAL;
sel <<= ffs(rdev->desc->csel_mask) - 1;
return max8998_update_reg(i2c, rdev->desc->csel_reg,
sel, rdev->desc->csel_mask);
}
int max8998_get_current_limit(struct regulator_dev *rdev)
{
struct max8998_data *max8998 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8998->iodev->i2c;
u8 val;
int ret;
ret = max8998_read_reg(i2c, rdev->desc->csel_reg, &val);
if (ret != 0)
return ret;
val &= rdev->desc->csel_mask;
val >>= ffs(rdev->desc->csel_mask) - 1;
if (rdev->desc->curr_table) {
if (val >= rdev->desc->n_current_limits)
return -EINVAL;
return rdev->desc->curr_table[val];
}
return -EINVAL;
}
static const struct regulator_ops max8998_ldo_ops = {
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
@ -379,6 +460,15 @@ static const struct regulator_ops max8998_buck_ops = {
.set_voltage_time_sel = max8998_set_voltage_buck_time_sel,
};
static const struct regulator_ops max8998_charger_ops = {
.set_current_limit = max8998_set_current_limit,
.get_current_limit = max8998_get_current_limit,
.is_enabled = max8998_ldo_is_enabled_inverted,
/* Swapped as register is inverted */
.enable = max8998_ldo_disable,
.disable = max8998_ldo_enable,
};
static const struct regulator_ops max8998_others_ops = {
.is_enabled = max8998_ldo_is_enabled,
.enable = max8998_ldo_enable,
@ -397,6 +487,19 @@ static const struct regulator_ops max8998_others_ops = {
.owner = THIS_MODULE, \
}
#define MAX8998_CURRENT_REG(_name, _ops, _table, _reg, _mask) \
{ \
.name = #_name, \
.id = MAX8998_##_name, \
.ops = _ops, \
.curr_table = _table, \
.n_current_limits = ARRAY_SIZE(_table), \
.csel_reg = _reg, \
.csel_mask = _mask, \
.type = REGULATOR_CURRENT, \
.owner = THIS_MODULE, \
}
#define MAX8998_OTHERS_REG(_name, _id) \
{ \
.name = #_name, \
@ -432,6 +535,8 @@ static const struct regulator_desc regulators[] = {
MAX8998_OTHERS_REG(ENVICHG, MAX8998_ENVICHG),
MAX8998_OTHERS_REG(ESAFEOUT1, MAX8998_ESAFEOUT1),
MAX8998_OTHERS_REG(ESAFEOUT2, MAX8998_ESAFEOUT2),
MAX8998_CURRENT_REG(CHARGER, &max8998_charger_ops,
charger_current_table, MAX8998_REG_CHGR1, 0x7),
};
static int max8998_pmic_dt_parse_dvs_gpio(struct max8998_dev *iodev,

1
include/linux/mfd/max8998.h
View File

@ -39,6 +39,7 @@ enum {
MAX8998_ENVICHG,
MAX8998_ESAFEOUT1,
MAX8998_ESAFEOUT2,
MAX8998_CHARGER,
};
/**