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/*
* Regulator driver for LP873X PMIC
*
* Copyright (C) 2016 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
* kind, whether expressed or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License version 2 for more details.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/lp873x.h>
#define LP873X_REGULATOR(_name, _id, _of, _ops, _n, _vr, _vm, _er, _em, \
_delay, _lr, _nlr, _cr) \
[_id] = { \
.desc = { \
.name = _name, \
.id = _id, \
.of_match = of_match_ptr(_of), \
.regulators_node = of_match_ptr("regulators"),\
.ops = &_ops, \
.n_voltages = _n, \
.type = REGULATOR_VOLTAGE, \
.owner = THIS_MODULE, \
.vsel_reg = _vr, \
.vsel_mask = _vm, \
.enable_reg = _er, \
.enable_mask = _em, \
.ramp_delay = _delay, \
.linear_ranges = _lr, \
.n_linear_ranges = _nlr, \
}, \
.ctrl2_reg = _cr, \
}
struct lp873x_regulator {
struct regulator_desc desc;
unsigned int ctrl2_reg;
};
static const struct lp873x_regulator regulators[];
static const struct regulator_linear_range buck0_buck1_ranges[] = {
REGULATOR_LINEAR_RANGE(0, 0x0, 0x13, 0),
REGULATOR_LINEAR_RANGE(700000, 0x14, 0x17, 10000),
REGULATOR_LINEAR_RANGE(735000, 0x18, 0x9d, 5000),
REGULATOR_LINEAR_RANGE(1420000, 0x9e, 0xff, 20000),
};
static const struct regulator_linear_range ldo0_ldo1_ranges[] = {
REGULATOR_LINEAR_RANGE(800000, 0x0, 0x19, 100000),
};
static unsigned int lp873x_buck_ramp_delay[] = {
30000, 15000, 10000, 7500, 3800, 1900, 940, 470
};
/* LP873X BUCK current limit */
static const unsigned int lp873x_buck_uA[] = {
1500000, 2000000, 2500000, 3000000, 3500000, 4000000,
};
static int lp873x_buck_set_ramp_delay(struct regulator_dev *rdev,
int ramp_delay)
{
int id = rdev_get_id(rdev);
struct lp873x *lp873 = rdev_get_drvdata(rdev);
unsigned int reg;
int ret;
if (ramp_delay <= 470)
reg = 7;
else if (ramp_delay <= 940)
reg = 6;
else if (ramp_delay <= 1900)
reg = 5;
else if (ramp_delay <= 3800)
reg = 4;
else if (ramp_delay <= 7500)
reg = 3;
else if (ramp_delay <= 10000)
reg = 2;
else if (ramp_delay <= 15000)
reg = 1;
else
reg = 0;
ret = regmap_update_bits(lp873->regmap, regulators[id].ctrl2_reg,
LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE,
reg << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_SLEW_RATE));
if (ret) {
dev_err(lp873->dev, "SLEW RATE write failed: %d\n", ret);
return ret;
}
rdev->constraints->ramp_delay = lp873x_buck_ramp_delay[reg];
return 0;
}
static int lp873x_buck_set_current_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
int id = rdev_get_id(rdev);
struct lp873x *lp873 = rdev_get_drvdata(rdev);
int i;
for (i = ARRAY_SIZE(lp873x_buck_uA) - 1; i >= 0; i--) {
if (lp873x_buck_uA[i] >= min_uA &&
lp873x_buck_uA[i] <= max_uA)
return regmap_update_bits(lp873->regmap,
regulators[id].ctrl2_reg,
LP873X_BUCK0_CTRL_2_BUCK0_ILIM,
i << __ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM));
}
return -EINVAL;
}
static int lp873x_buck_get_current_limit(struct regulator_dev *rdev)
{
int id = rdev_get_id(rdev);
struct lp873x *lp873 = rdev_get_drvdata(rdev);
int ret;
unsigned int val;
ret = regmap_read(lp873->regmap, regulators[id].ctrl2_reg, &val);
if (ret)
return ret;
val = (val & LP873X_BUCK0_CTRL_2_BUCK0_ILIM) >>
__ffs(LP873X_BUCK0_CTRL_2_BUCK0_ILIM);
return (val < ARRAY_SIZE(lp873x_buck_uA)) ?
lp873x_buck_uA[val] : -EINVAL;
}
/* Operations permitted on BUCK0, BUCK1 */
static struct regulator_ops lp873x_buck01_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_ramp_delay = lp873x_buck_set_ramp_delay,
.set_current_limit = lp873x_buck_set_current_limit,
.get_current_limit = lp873x_buck_get_current_limit,
};
/* Operations permitted on LDO0 and LDO1 */
static struct regulator_ops lp873x_ldo01_ops = {
.is_enabled = regulator_is_enabled_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
};
static const struct lp873x_regulator regulators[] = {
LP873X_REGULATOR("BUCK0", LP873X_BUCK_0, "buck0", lp873x_buck01_ops,
256, LP873X_REG_BUCK0_VOUT,
LP873X_BUCK0_VOUT_BUCK0_VSET, LP873X_REG_BUCK0_CTRL_1,
LP873X_BUCK0_CTRL_1_BUCK0_EN, 10000,
buck0_buck1_ranges, 4, LP873X_REG_BUCK0_CTRL_2),
LP873X_REGULATOR("BUCK1", LP873X_BUCK_1, "buck1", lp873x_buck01_ops,
256, LP873X_REG_BUCK1_VOUT,
LP873X_BUCK1_VOUT_BUCK1_VSET, LP873X_REG_BUCK1_CTRL_1,
LP873X_BUCK1_CTRL_1_BUCK1_EN, 10000,
buck0_buck1_ranges, 4, LP873X_REG_BUCK1_CTRL_2),
LP873X_REGULATOR("LDO0", LP873X_LDO_0, "ldo0", lp873x_ldo01_ops, 26,
LP873X_REG_LDO0_VOUT, LP873X_LDO0_VOUT_LDO0_VSET,
LP873X_REG_LDO0_CTRL,
LP873X_LDO0_CTRL_LDO0_EN, 0, ldo0_ldo1_ranges, 1,
0xFF),
LP873X_REGULATOR("LDO1", LP873X_LDO_1, "ldo1", lp873x_ldo01_ops, 26,
LP873X_REG_LDO1_VOUT, LP873X_LDO1_VOUT_LDO1_VSET,
LP873X_REG_LDO1_CTRL,
LP873X_LDO1_CTRL_LDO1_EN, 0, ldo0_ldo1_ranges, 1,
0xFF),
};
static int lp873x_regulator_probe(struct platform_device *pdev)
{
struct lp873x *lp873 = dev_get_drvdata(pdev->dev.parent);
struct regulator_config config = { };
struct regulator_dev *rdev;
int i;
platform_set_drvdata(pdev, lp873);
config.dev = &pdev->dev;
config.dev->of_node = lp873->dev->of_node;
config.driver_data = lp873;
config.regmap = lp873->regmap;
for (i = 0; i < ARRAY_SIZE(regulators); i++) {
rdev = devm_regulator_register(&pdev->dev, ®ulators[i].desc,
&config);
if (IS_ERR(rdev)) {
dev_err(lp873->dev, "failed to register %s regulator\n",
pdev->name);
return PTR_ERR(rdev);
}
}
return 0;
}
static const struct platform_device_id lp873x_regulator_id_table[] = {
{ "lp873x-regulator", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, lp873x_regulator_id_table);
static struct platform_driver lp873x_regulator_driver = {
.driver = {
.name = "lp873x-pmic",
},
.probe = lp873x_regulator_probe,
.id_table = lp873x_regulator_id_table,
};
module_platform_driver(lp873x_regulator_driver);
MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
MODULE_DESCRIPTION("LP873X voltage regulator driver");
MODULE_ALIAS("platform:lp873x-pmic");
MODULE_LICENSE("GPL v2");
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