Jaewon Kim | 9dfffb7 | 2015-02-05 15:35:58 +0900 | [diff] [blame] | 1 | /* |
| 2 | * max77843.c - Regulator driver for the Maxim MAX77843 |
| 3 | * |
| 4 | * Copyright (C) 2015 Samsung Electronics |
| 5 | * Author: Jaewon Kim <jaewon02.kim@samsung.com> |
| 6 | * Author: Beomho Seo <beomho.seo@samsung.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/regulator/driver.h> |
| 17 | #include <linux/regulator/machine.h> |
| 18 | #include <linux/mfd/max77843-private.h> |
| 19 | #include <linux/regulator/of_regulator.h> |
| 20 | |
| 21 | enum max77843_regulator_type { |
| 22 | MAX77843_SAFEOUT1 = 0, |
| 23 | MAX77843_SAFEOUT2, |
| 24 | MAX77843_CHARGER, |
| 25 | |
| 26 | MAX77843_NUM, |
| 27 | }; |
| 28 | |
| 29 | static const unsigned int max77843_safeout_voltage_table[] = { |
| 30 | 4850000, |
| 31 | 4900000, |
| 32 | 4950000, |
| 33 | 3300000, |
| 34 | }; |
| 35 | |
| 36 | static int max77843_reg_is_enabled(struct regulator_dev *rdev) |
| 37 | { |
| 38 | struct regmap *regmap = rdev->regmap; |
| 39 | int ret; |
| 40 | unsigned int reg; |
| 41 | |
| 42 | ret = regmap_read(regmap, rdev->desc->enable_reg, ®); |
| 43 | if (ret) { |
| 44 | dev_err(&rdev->dev, "Fialed to read charger register\n"); |
| 45 | return ret; |
| 46 | } |
| 47 | |
| 48 | return (reg & rdev->desc->enable_mask) == rdev->desc->enable_mask; |
| 49 | } |
| 50 | |
| 51 | static int max77843_reg_get_current_limit(struct regulator_dev *rdev) |
| 52 | { |
| 53 | struct regmap *regmap = rdev->regmap; |
| 54 | unsigned int chg_min_uA = rdev->constraints->min_uA; |
| 55 | unsigned int chg_max_uA = rdev->constraints->max_uA; |
| 56 | unsigned int val; |
| 57 | int ret; |
| 58 | unsigned int reg, sel; |
| 59 | |
| 60 | ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, ®); |
| 61 | if (ret) { |
| 62 | dev_err(&rdev->dev, "Failed to read charger register\n"); |
| 63 | return ret; |
| 64 | } |
| 65 | |
| 66 | sel = reg & MAX77843_CHG_FAST_CHG_CURRENT_MASK; |
| 67 | |
| 68 | if (sel < 0x03) |
| 69 | sel = 0; |
| 70 | else |
| 71 | sel -= 2; |
| 72 | |
| 73 | val = chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel; |
| 74 | if (val > chg_max_uA) |
| 75 | return -EINVAL; |
| 76 | |
| 77 | return val; |
| 78 | } |
| 79 | |
| 80 | static int max77843_reg_set_current_limit(struct regulator_dev *rdev, |
| 81 | int min_uA, int max_uA) |
| 82 | { |
| 83 | struct regmap *regmap = rdev->regmap; |
| 84 | unsigned int chg_min_uA = rdev->constraints->min_uA; |
| 85 | int sel = 0; |
| 86 | |
| 87 | while (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel < min_uA) |
| 88 | sel++; |
| 89 | |
| 90 | if (chg_min_uA + MAX77843_CHG_FAST_CHG_CURRENT_STEP * sel > max_uA) |
| 91 | return -EINVAL; |
| 92 | |
| 93 | sel += 2; |
| 94 | |
| 95 | return regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_02, sel); |
| 96 | } |
| 97 | |
| 98 | static struct regulator_ops max77843_charger_ops = { |
| 99 | .is_enabled = max77843_reg_is_enabled, |
| 100 | .enable = regulator_enable_regmap, |
| 101 | .disable = regulator_disable_regmap, |
| 102 | .get_current_limit = max77843_reg_get_current_limit, |
| 103 | .set_current_limit = max77843_reg_set_current_limit, |
| 104 | }; |
| 105 | |
| 106 | static struct regulator_ops max77843_regulator_ops = { |
| 107 | .is_enabled = regulator_is_enabled_regmap, |
| 108 | .enable = regulator_enable_regmap, |
| 109 | .disable = regulator_disable_regmap, |
| 110 | .list_voltage = regulator_list_voltage_table, |
| 111 | .get_voltage_sel = regulator_get_voltage_sel_regmap, |
| 112 | .set_voltage_sel = regulator_set_voltage_sel_regmap, |
| 113 | }; |
| 114 | |
| 115 | static const struct regulator_desc max77843_supported_regulators[] = { |
| 116 | [MAX77843_SAFEOUT1] = { |
| 117 | .name = "SAFEOUT1", |
| 118 | .id = MAX77843_SAFEOUT1, |
| 119 | .ops = &max77843_regulator_ops, |
| 120 | .of_match = of_match_ptr("SAFEOUT1"), |
| 121 | .regulators_node = of_match_ptr("regulators"), |
| 122 | .type = REGULATOR_VOLTAGE, |
| 123 | .owner = THIS_MODULE, |
| 124 | .n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table), |
| 125 | .volt_table = max77843_safeout_voltage_table, |
| 126 | .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL, |
| 127 | .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT1, |
| 128 | .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL, |
| 129 | .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT1_MASK, |
| 130 | }, |
| 131 | [MAX77843_SAFEOUT2] = { |
| 132 | .name = "SAFEOUT2", |
| 133 | .id = MAX77843_SAFEOUT2, |
| 134 | .ops = &max77843_regulator_ops, |
| 135 | .of_match = of_match_ptr("SAFEOUT2"), |
| 136 | .regulators_node = of_match_ptr("regulators"), |
| 137 | .type = REGULATOR_VOLTAGE, |
| 138 | .owner = THIS_MODULE, |
| 139 | .n_voltages = ARRAY_SIZE(max77843_safeout_voltage_table), |
| 140 | .volt_table = max77843_safeout_voltage_table, |
| 141 | .enable_reg = MAX77843_SYS_REG_SAFEOUTCTRL, |
| 142 | .enable_mask = MAX77843_REG_SAFEOUTCTRL_ENSAFEOUT2, |
| 143 | .vsel_reg = MAX77843_SYS_REG_SAFEOUTCTRL, |
| 144 | .vsel_mask = MAX77843_REG_SAFEOUTCTRL_SAFEOUT2_MASK, |
| 145 | }, |
| 146 | [MAX77843_CHARGER] = { |
| 147 | .name = "CHARGER", |
| 148 | .id = MAX77843_CHARGER, |
| 149 | .ops = &max77843_charger_ops, |
| 150 | .of_match = of_match_ptr("CHARGER"), |
| 151 | .regulators_node = of_match_ptr("regulators"), |
| 152 | .type = REGULATOR_CURRENT, |
| 153 | .owner = THIS_MODULE, |
| 154 | .enable_reg = MAX77843_CHG_REG_CHG_CNFG_00, |
| 155 | .enable_mask = MAX77843_CHG_MASK, |
| 156 | }, |
| 157 | }; |
| 158 | |
| 159 | static struct regmap *max77843_get_regmap(struct max77843 *max77843, int reg_id) |
| 160 | { |
| 161 | switch (reg_id) { |
| 162 | case MAX77843_SAFEOUT1: |
| 163 | case MAX77843_SAFEOUT2: |
| 164 | return max77843->regmap; |
| 165 | case MAX77843_CHARGER: |
| 166 | return max77843->regmap_chg; |
| 167 | default: |
| 168 | return max77843->regmap; |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | static int max77843_regulator_probe(struct platform_device *pdev) |
| 173 | { |
| 174 | struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent); |
| 175 | struct regulator_config config = {}; |
| 176 | int i; |
| 177 | |
| 178 | config.dev = max77843->dev; |
| 179 | config.driver_data = max77843; |
| 180 | |
| 181 | for (i = 0; i < ARRAY_SIZE(max77843_supported_regulators); i++) { |
| 182 | struct regulator_dev *regulator; |
| 183 | |
| 184 | config.regmap = max77843_get_regmap(max77843, |
| 185 | max77843_supported_regulators[i].id); |
| 186 | |
| 187 | regulator = devm_regulator_register(&pdev->dev, |
| 188 | &max77843_supported_regulators[i], &config); |
| 189 | if (IS_ERR(regulator)) { |
| 190 | dev_err(&pdev->dev, |
| 191 | "Failed to regiser regulator-%d\n", i); |
| 192 | return PTR_ERR(regulator); |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | static const struct platform_device_id max77843_regulator_id[] = { |
| 200 | { "max77843-regulator", }, |
| 201 | { /* sentinel */ }, |
| 202 | }; |
| 203 | |
| 204 | static struct platform_driver max77843_regulator_driver = { |
| 205 | .driver = { |
| 206 | .name = "max77843-regulator", |
| 207 | }, |
| 208 | .probe = max77843_regulator_probe, |
| 209 | .id_table = max77843_regulator_id, |
| 210 | }; |
| 211 | |
| 212 | static int __init max77843_regulator_init(void) |
| 213 | { |
| 214 | return platform_driver_register(&max77843_regulator_driver); |
| 215 | } |
| 216 | subsys_initcall(max77843_regulator_init); |
| 217 | |
| 218 | static void __exit max77843_regulator_exit(void) |
| 219 | { |
| 220 | platform_driver_unregister(&max77843_regulator_driver); |
| 221 | } |
| 222 | module_exit(max77843_regulator_exit); |
| 223 | |
| 224 | MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>"); |
| 225 | MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>"); |
| 226 | MODULE_DESCRIPTION("Maxim MAX77843 regulator driver"); |
| 227 | MODULE_LICENSE("GPL"); |