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1// SPDX-License-Identifier: GPL-2.0+2//3// sy8106a-regulator.c - Regulator device driver for SY8106A4//5// Copyright (C) 2016 Ondřej Jirman <megous@megous.com>6// Copyright (c) 2017-2018 Icenowy Zheng <icenowy@aosc.io>7 8#include <linux/err.h>9#include <linux/i2c.h>10#include <linux/module.h>11#include <linux/regmap.h>12#include <linux/regulator/driver.h>13#include <linux/regulator/of_regulator.h>14 15#define SY8106A_REG_VOUT1_SEL 0x0116#define SY8106A_REG_VOUT_COM 0x0217#define SY8106A_REG_VOUT1_SEL_MASK 0x7f18#define SY8106A_DISABLE_REG BIT(0)19/*20 * The I2C controlled voltage will only work when this bit is set; otherwise21 * it will behave like a fixed regulator.22 */23#define SY8106A_GO_BIT BIT(7)24 25static const struct regmap_config sy8106a_regmap_config = {26 .reg_bits = 8,27 .val_bits = 8,28};29 30static const struct regulator_ops sy8106a_ops = {31 .set_voltage_sel = regulator_set_voltage_sel_regmap,32 .set_voltage_time_sel = regulator_set_voltage_time_sel,33 .get_voltage_sel = regulator_get_voltage_sel_regmap,34 .list_voltage = regulator_list_voltage_linear,35 /* Enabling/disabling the regulator is not yet implemented */36};37 38/* Default limits measured in millivolts */39#define SY8106A_MIN_MV 68040#define SY8106A_MAX_MV 195041#define SY8106A_STEP_MV 1042 43static const struct regulator_desc sy8106a_reg = {44 .name = "SY8106A",45 .id = 0,46 .ops = &sy8106a_ops,47 .type = REGULATOR_VOLTAGE,48 .n_voltages = ((SY8106A_MAX_MV - SY8106A_MIN_MV) / SY8106A_STEP_MV) + 1,49 .min_uV = (SY8106A_MIN_MV * 1000),50 .uV_step = (SY8106A_STEP_MV * 1000),51 .vsel_reg = SY8106A_REG_VOUT1_SEL,52 .vsel_mask = SY8106A_REG_VOUT1_SEL_MASK,53 /*54 * This ramp_delay is a conservative default value which works on55 * H3/H5 boards VDD-CPUX situations.56 */57 .ramp_delay = 200,58 .owner = THIS_MODULE,59};60 61/*62 * I2C driver interface functions63 */64static int sy8106a_i2c_probe(struct i2c_client *i2c)65{66 struct device *dev = &i2c->dev;67 struct regulator_dev *rdev;68 struct regulator_config config = { };69 struct regmap *regmap;70 unsigned int reg, vsel;71 u32 fixed_voltage;72 int error;73 74 error = of_property_read_u32(dev->of_node, "silergy,fixed-microvolt",75 &fixed_voltage);76 if (error)77 return error;78 79 if (fixed_voltage < SY8106A_MIN_MV * 1000 ||80 fixed_voltage > SY8106A_MAX_MV * 1000)81 return -EINVAL;82 83 regmap = devm_regmap_init_i2c(i2c, &sy8106a_regmap_config);84 if (IS_ERR(regmap)) {85 error = PTR_ERR(regmap);86 dev_err(dev, "Failed to allocate register map: %d\n", error);87 return error;88 }89 90 config.dev = &i2c->dev;91 config.regmap = regmap;92 93 config.of_node = dev->of_node;94 config.init_data = of_get_regulator_init_data(dev, dev->of_node,95 &sy8106a_reg);96 97 if (!config.init_data)98 return -ENOMEM;99 100 /* Ensure GO_BIT is enabled when probing */101 error = regmap_read(regmap, SY8106A_REG_VOUT1_SEL, ®);102 if (error)103 return error;104 105 if (!(reg & SY8106A_GO_BIT)) {106 vsel = (fixed_voltage / 1000 - SY8106A_MIN_MV) /107 SY8106A_STEP_MV;108 109 error = regmap_write(regmap, SY8106A_REG_VOUT1_SEL,110 vsel | SY8106A_GO_BIT);111 if (error)112 return error;113 }114 115 /* Probe regulator */116 rdev = devm_regulator_register(&i2c->dev, &sy8106a_reg, &config);117 if (IS_ERR(rdev)) {118 error = PTR_ERR(rdev);119 dev_err(&i2c->dev, "Failed to register SY8106A regulator: %d\n", error);120 return error;121 }122 123 return 0;124}125 126static const struct of_device_id sy8106a_i2c_of_match[] = {127 { .compatible = "silergy,sy8106a" },128 { },129};130MODULE_DEVICE_TABLE(of, sy8106a_i2c_of_match);131 132static const struct i2c_device_id sy8106a_i2c_id[] = {133 { "sy8106a" },134 { }135};136MODULE_DEVICE_TABLE(i2c, sy8106a_i2c_id);137 138static struct i2c_driver sy8106a_regulator_driver = {139 .driver = {140 .name = "sy8106a",141 .probe_type = PROBE_PREFER_ASYNCHRONOUS,142 .of_match_table = sy8106a_i2c_of_match,143 },144 .probe = sy8106a_i2c_probe,145 .id_table = sy8106a_i2c_id,146};147 148module_i2c_driver(sy8106a_regulator_driver);149 150MODULE_AUTHOR("Ondřej Jirman <megous@megous.com>");151MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");152MODULE_DESCRIPTION("Regulator device driver for Silergy SY8106A");153MODULE_LICENSE("GPL");154