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1// SPDX-License-Identifier: GPL-2.02//3// Copyright (c) 2015 MediaTek Inc.4// Author: Henry Chen <henryc.chen@mediatek.com>5 6#include <linux/err.h>7#include <linux/i2c.h>8#include <linux/init.h>9#include <linux/interrupt.h>10#include <linux/module.h>11#include <linux/regmap.h>12#include <linux/regulator/driver.h>13#include <linux/regulator/machine.h>14#include <linux/regulator/of_regulator.h>15#include <linux/regulator/mt6311.h>16#include <linux/slab.h>17#include "mt6311-regulator.h"18 19static const struct regmap_config mt6311_regmap_config = {20 .reg_bits = 8,21 .val_bits = 8,22 .max_register = MT6311_FQMTR_CON4,23 .cache_type = REGCACHE_MAPLE,24};25 26/* Default limits measured in millivolts and milliamps */27#define MT6311_MIN_UV 60000028#define MT6311_MAX_UV 139375029#define MT6311_STEP_UV 625030 31static const struct regulator_ops mt6311_buck_ops = {32 .list_voltage = regulator_list_voltage_linear,33 .map_voltage = regulator_map_voltage_linear,34 .set_voltage_sel = regulator_set_voltage_sel_regmap,35 .get_voltage_sel = regulator_get_voltage_sel_regmap,36 .set_voltage_time_sel = regulator_set_voltage_time_sel,37 .enable = regulator_enable_regmap,38 .disable = regulator_disable_regmap,39 .is_enabled = regulator_is_enabled_regmap,40};41 42static const struct regulator_ops mt6311_ldo_ops = {43 .enable = regulator_enable_regmap,44 .disable = regulator_disable_regmap,45 .is_enabled = regulator_is_enabled_regmap,46};47 48#define MT6311_BUCK(_id) \49{\50 .name = #_id,\51 .ops = &mt6311_buck_ops,\52 .of_match = of_match_ptr(#_id),\53 .regulators_node = of_match_ptr("regulators"),\54 .type = REGULATOR_VOLTAGE,\55 .id = MT6311_ID_##_id,\56 .n_voltages = (MT6311_MAX_UV - MT6311_MIN_UV) / MT6311_STEP_UV + 1,\57 .min_uV = MT6311_MIN_UV,\58 .uV_step = MT6311_STEP_UV,\59 .owner = THIS_MODULE,\60 .enable_reg = MT6311_VDVFS11_CON9,\61 .enable_mask = MT6311_PMIC_VDVFS11_EN_MASK,\62 .vsel_reg = MT6311_VDVFS11_CON12,\63 .vsel_mask = MT6311_PMIC_VDVFS11_VOSEL_MASK,\64}65 66#define MT6311_LDO(_id) \67{\68 .name = #_id,\69 .ops = &mt6311_ldo_ops,\70 .of_match = of_match_ptr(#_id),\71 .regulators_node = of_match_ptr("regulators"),\72 .type = REGULATOR_VOLTAGE,\73 .id = MT6311_ID_##_id,\74 .owner = THIS_MODULE,\75 .enable_reg = MT6311_LDO_CON3,\76 .enable_mask = MT6311_PMIC_RG_VBIASN_EN_MASK,\77}78 79static const struct regulator_desc mt6311_regulators[] = {80 MT6311_BUCK(VDVFS),81 MT6311_LDO(VBIASN),82};83 84/*85 * I2C driver interface functions86 */87static int mt6311_i2c_probe(struct i2c_client *i2c)88{89 struct regulator_config config = { };90 struct regulator_dev *rdev;91 struct regmap *regmap;92 int i, ret;93 unsigned int data;94 95 regmap = devm_regmap_init_i2c(i2c, &mt6311_regmap_config);96 if (IS_ERR(regmap)) {97 ret = PTR_ERR(regmap);98 dev_err(&i2c->dev, "Failed to allocate register map: %d\n",99 ret);100 return ret;101 }102 103 ret = regmap_read(regmap, MT6311_SWCID, &data);104 if (ret < 0) {105 dev_err(&i2c->dev, "Failed to read DEVICE_ID reg: %d\n", ret);106 return ret;107 }108 109 switch (data) {110 case MT6311_E1_CID_CODE:111 case MT6311_E2_CID_CODE:112 case MT6311_E3_CID_CODE:113 break;114 default:115 dev_err(&i2c->dev, "Unsupported device id = 0x%x.\n", data);116 return -ENODEV;117 }118 119 for (i = 0; i < MT6311_MAX_REGULATORS; i++) {120 config.dev = &i2c->dev;121 config.regmap = regmap;122 123 rdev = devm_regulator_register(&i2c->dev,124 &mt6311_regulators[i], &config);125 if (IS_ERR(rdev)) {126 dev_err(&i2c->dev,127 "Failed to register MT6311 regulator\n");128 return PTR_ERR(rdev);129 }130 }131 132 return 0;133}134 135static const struct i2c_device_id mt6311_i2c_id[] = {136 { "mt6311" },137 {}138};139MODULE_DEVICE_TABLE(i2c, mt6311_i2c_id);140 141#ifdef CONFIG_OF142static const struct of_device_id mt6311_dt_ids[] = {143 { .compatible = "mediatek,mt6311-regulator",144 .data = &mt6311_i2c_id[0] },145 {},146};147MODULE_DEVICE_TABLE(of, mt6311_dt_ids);148#endif149 150static struct i2c_driver mt6311_regulator_driver = {151 .driver = {152 .name = "mt6311",153 .probe_type = PROBE_PREFER_ASYNCHRONOUS,154 .of_match_table = of_match_ptr(mt6311_dt_ids),155 },156 .probe = mt6311_i2c_probe,157 .id_table = mt6311_i2c_id,158};159 160module_i2c_driver(mt6311_regulator_driver);161 162MODULE_AUTHOR("Henry Chen <henryc.chen@mediatek.com>");163MODULE_DESCRIPTION("Regulator device driver for Mediatek MT6311");164MODULE_LICENSE("GPL v2");165