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