1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // max77693.c - Regulator driver for the Maxim 77693 and 77843 4 // 5 // Copyright (C) 2013-2015 Samsung Electronics 6 // Jonghwa Lee <jonghwa3.lee@samsung.com> 7 // Krzysztof Kozlowski <krzk@kernel.org> 8 // 9 // This driver is based on max77686.c 10 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 */ 29 enum 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 */ 38 struct 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 : 20mA 47 * 0x00, 0x01, 0x2, 0x03 = 60 mA 48 * 0x04 ~ 0x7E = (60 + (X - 3) * 20) mA 49 * 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 */ 55 static 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 else 74 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 83 static 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 */ 104 static 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 } 122 123 static const unsigned int max77693_safeout_table[] = { 124 4850000, 125 4900000, 126 4950000, 127 3300000, 128 }; 129 130 static 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 }; 138 139 static 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 } 162 163 static 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 }; 180 181 static 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 } 203 204 static 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 }; 220 221 static 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 }; 227 228 static 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 } 272 273 static const struct platform_device_id max77693_pmic_id[] = { 274 { "max77693-pmic", TYPE_MAX77693 }, 275 { "max77843-regulator", TYPE_MAX77843 }, 276 {}, 277 }; 278 279 MODULE_DEVICE_TABLE(platform, max77693_pmic_id); 280 281 static 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 }; 289 290 static int __init max77693_pmic_init(void) 291 { 292 return platform_driver_register(&max77693_pmic_driver); 293 } 294 subsys_initcall(max77693_pmic_init); 295 296 static void __exit max77693_pmic_cleanup(void) 297 { 298 platform_driver_unregister(&max77693_pmic_driver); 299 } 300 module_exit(max77693_pmic_cleanup); 301 302 MODULE_DESCRIPTION("MAXIM 77693/77843 regulator driver"); 303 MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>"); 304 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); 305 MODULE_LICENSE("GPL"); 306