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1// SPDX-License-Identifier: GPL-2.0+2//3// max77693.c - Regulator driver for the Maxim 77693 and 778434//5// Copyright (C) 2013-2015 Samsung Electronics6// Jonghwa Lee <jonghwa3.lee@samsung.com>7// Krzysztof Kozlowski <krzk@kernel.org>8//9// This driver is based on max77686.c10 11#include <linux/err.h>12#include <linux/slab.h>13#include <linux/platform_device.h>14#include <linux/module.h>15#include <linux/export.h>16#include <linux/regulator/driver.h>17#include <linux/regulator/machine.h>18#include <linux/mfd/max77693.h>19#include <linux/mfd/max77693-common.h>20#include <linux/mfd/max77693-private.h>21#include <linux/mfd/max77843-private.h>22#include <linux/regulator/of_regulator.h>23#include <linux/regmap.h>24 25/*26 * ID for MAX77843 regulators.27 * There is no need for such for MAX77693.28 */29enum max77843_regulator_type {30 MAX77843_SAFEOUT1 = 0,31 MAX77843_SAFEOUT2,32 MAX77843_CHARGER,33 34 MAX77843_NUM,35};36 37/* Register differences between chargers: MAX77693 and MAX77843 */38struct chg_reg_data {39 unsigned int linear_reg;40 unsigned int linear_mask;41 unsigned int uA_step;42 unsigned int min_sel;43};44 45/*46 * MAX77693 CHARGER regulator - Min : 20mA, Max : 2580mA, step : 20mA47 * 0x00, 0x01, 0x2, 0x03 = 60 mA48 * 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA49 * Actually for MAX77693 the driver manipulates the maximum input current,50 * not the fast charge current (output). This should be fixed.51 *52 * On MAX77843 the calculation formula is the same (except values).53 * Fortunately it properly manipulates the fast charge current.54 */55static int max77693_chg_get_current_limit(struct regulator_dev *rdev)56{57 const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);58 unsigned int chg_min_uA = rdev->constraints->min_uA;59 unsigned int chg_max_uA = rdev->constraints->max_uA;60 unsigned int reg, sel;61 unsigned int val;62 int ret;63 64 ret = regmap_read(rdev->regmap, reg_data->linear_reg, ®);65 if (ret < 0)66 return ret;67 68 sel = reg & reg_data->linear_mask;69 70 /* the first four codes for charger current are all 60mA */71 if (sel <= reg_data->min_sel)72 sel = 0;73 else74 sel -= reg_data->min_sel;75 76 val = chg_min_uA + reg_data->uA_step * sel;77 if (val > chg_max_uA)78 return -EINVAL;79 80 return val;81}82 83static int max77693_chg_set_current_limit(struct regulator_dev *rdev,84 int min_uA, int max_uA)85{86 const struct chg_reg_data *reg_data = rdev_get_drvdata(rdev);87 unsigned int chg_min_uA = rdev->constraints->min_uA;88 int sel = 0;89 90 while (chg_min_uA + reg_data->uA_step * sel < min_uA)91 sel++;92 93 if (chg_min_uA + reg_data->uA_step * sel > max_uA)94 return -EINVAL;95 96 /* the first four codes for charger current are all 60mA */97 sel += reg_data->min_sel;98 99 return regmap_write(rdev->regmap, reg_data->linear_reg, sel);100}101/* end of CHARGER regulator ops */102 103/* Returns regmap suitable for given regulator on chosen device */104static struct regmap *max77693_get_regmap(enum max77693_types type,105 struct max77693_dev *max77693,106 int reg_id)107{108 if (type == TYPE_MAX77693)109 return max77693->regmap;110 111 /* Else: TYPE_MAX77843 */112 switch (reg_id) {113 case MAX77843_SAFEOUT1:114 case MAX77843_SAFEOUT2:115 return max77693->regmap;116 case MAX77843_CHARGER:117 return max77693->regmap_chg;118 default:119 return max77693->regmap;120 }121}122 123static const unsigned int max77693_safeout_table[] = {124 4850000,125 4900000,126 4950000,127 3300000,128};129 130static const struct regulator_ops max77693_safeout_ops = {131 .list_voltage = regulator_list_voltage_table,132 .is_enabled = regulator_is_enabled_regmap,133 .enable = regulator_enable_regmap,134 .disable = regulator_disable_regmap,135 .get_voltage_sel = regulator_get_voltage_sel_regmap,136 .set_voltage_sel = regulator_set_voltage_sel_regmap,137};138 139static const struct regulator_ops max77693_charger_ops = {140 .is_enabled = regulator_is_enabled_regmap,141 .enable = regulator_enable_regmap,142 .disable = regulator_disable_regmap,143 .get_current_limit = max77693_chg_get_current_limit,144 .set_current_limit = max77693_chg_set_current_limit,145};146 147#define max77693_regulator_desc_esafeout(_num) { \148 .name = "ESAFEOUT"#_num, \149 .id = MAX77693_ESAFEOUT##_num, \150 .of_match = of_match_ptr("ESAFEOUT"#_num), \151 .regulators_node = of_match_ptr("regulators"), \152 .n_voltages = 4, \153 .ops = &max77693_safeout_ops, \154 .type = REGULATOR_VOLTAGE, \155 .owner = THIS_MODULE, \156 .volt_table = max77693_safeout_table, \157 .vsel_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \158 .vsel_mask = SAFEOUT_CTRL_SAFEOUT##_num##_MASK, \159 .enable_reg = MAX77693_CHG_REG_SAFEOUT_CTRL, \160 .enable_mask = SAFEOUT_CTRL_ENSAFEOUT##_num##_MASK , \161}162 163static const struct regulator_desc max77693_supported_regulators[] = {164 max77693_regulator_desc_esafeout(1),165 max77693_regulator_desc_esafeout(2),166 {167 .name = "CHARGER",168 .id = MAX77693_CHARGER,169 .of_match = of_match_ptr("CHARGER"),170 .regulators_node = of_match_ptr("regulators"),171 .ops = &max77693_charger_ops,172 .type = REGULATOR_CURRENT,173 .owner = THIS_MODULE,174 .enable_reg = MAX77693_CHG_REG_CHG_CNFG_00,175 .enable_mask = CHG_CNFG_00_CHG_MASK |176 CHG_CNFG_00_BUCK_MASK,177 .enable_val = CHG_CNFG_00_CHG_MASK | CHG_CNFG_00_BUCK_MASK,178 },179};180 181static const struct chg_reg_data max77693_chg_reg_data = {182 .linear_reg = MAX77693_CHG_REG_CHG_CNFG_09,183 .linear_mask = CHG_CNFG_09_CHGIN_ILIM_MASK,184 .uA_step = 20000,185 .min_sel = 3,186};187 188#define max77843_regulator_desc_esafeout(num) { \189 .name = "SAFEOUT" # num, \190 .id = MAX77843_SAFEOUT ## num, \191 .ops = &max77693_safeout_ops, \192 .of_match = of_match_ptr("SAFEOUT" # num), \193 .regulators_node = of_match_ptr("regulators"), \194 .type = REGULATOR_VOLTAGE, \195 .owner = THIS_MODULE, \196 .n_voltages = ARRAY_SIZE(max77693_safeout_table), \197 .volt_table = max77693_safeout_table, \198 .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \199 .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT ## num, \200 .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL, \201 .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT ## num ## _MASK, \202}203 204static const struct regulator_desc max77843_supported_regulators[] = {205 [MAX77843_SAFEOUT1] = max77843_regulator_desc_esafeout(1),206 [MAX77843_SAFEOUT2] = max77843_regulator_desc_esafeout(2),207 [MAX77843_CHARGER] = {208 .name = "CHARGER",209 .id = MAX77843_CHARGER,210 .ops = &max77693_charger_ops,211 .of_match = of_match_ptr("CHARGER"),212 .regulators_node = of_match_ptr("regulators"),213 .type = REGULATOR_CURRENT,214 .owner = THIS_MODULE,215 .enable_reg = MAX77843_CHG_REG_CHG_CNFG_00,216 .enable_mask = MAX77843_CHG_MASK,217 .enable_val = MAX77843_CHG_MASK,218 },219};220 221static const struct chg_reg_data max77843_chg_reg_data = {222 .linear_reg = MAX77843_CHG_REG_CHG_CNFG_02,223 .linear_mask = MAX77843_CHG_FAST_CHG_CURRENT_MASK,224 .uA_step = MAX77843_CHG_FAST_CHG_CURRENT_STEP,225 .min_sel = 2,226};227 228static int max77693_pmic_probe(struct platform_device *pdev)229{230 enum max77693_types type = platform_get_device_id(pdev)->driver_data;231 struct max77693_dev *iodev = dev_get_drvdata(pdev->dev.parent);232 const struct regulator_desc *regulators;233 unsigned int regulators_size;234 int i;235 struct regulator_config config = { };236 237 config.dev = iodev->dev;238 239 switch (type) {240 case TYPE_MAX77693:241 regulators = max77693_supported_regulators;242 regulators_size = ARRAY_SIZE(max77693_supported_regulators);243 config.driver_data = (void *)&max77693_chg_reg_data;244 break;245 case TYPE_MAX77843:246 regulators = max77843_supported_regulators;247 regulators_size = ARRAY_SIZE(max77843_supported_regulators);248 config.driver_data = (void *)&max77843_chg_reg_data;249 break;250 default:251 dev_err(&pdev->dev, "Unsupported device type: %u\n", type);252 return -ENODEV;253 }254 255 for (i = 0; i < regulators_size; i++) {256 struct regulator_dev *rdev;257 258 config.regmap = max77693_get_regmap(type, iodev,259 regulators[i].id);260 261 rdev = devm_regulator_register(&pdev->dev,262 ®ulators[i], &config);263 if (IS_ERR(rdev)) {264 dev_err(&pdev->dev,265 "Failed to initialize regulator-%d\n", i);266 return PTR_ERR(rdev);267 }268 }269 270 return 0;271}272 273static const struct platform_device_id max77693_pmic_id[] = {274 { "max77693-pmic", TYPE_MAX77693 },275 { "max77843-regulator", TYPE_MAX77843 },276 {},277};278 279MODULE_DEVICE_TABLE(platform, max77693_pmic_id);280 281static struct platform_driver max77693_pmic_driver = {282 .driver = {283 .name = "max77693-pmic",284 .probe_type = PROBE_PREFER_ASYNCHRONOUS,285 },286 .probe = max77693_pmic_probe,287 .id_table = max77693_pmic_id,288};289 290static int __init max77693_pmic_init(void)291{292 return platform_driver_register(&max77693_pmic_driver);293}294subsys_initcall(max77693_pmic_init);295 296static void __exit max77693_pmic_cleanup(void)297{298 platform_driver_unregister(&max77693_pmic_driver);299}300module_exit(max77693_pmic_cleanup);301 302MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver");303MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");304MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");305MODULE_LICENSE("GPL");306