1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // max14577.c - Regulator driver for the Maxim 14577/77836 4 // 5 // Copyright (C) 2013,2014 Samsung Electronics 6 // Krzysztof Kozlowski <krzk@kernel.org> 7 8 #include <linux/module.h> 9 #include <linux/platform_device.h> 10 #include <linux/regulator/driver.h> 11 #include <linux/mfd/max14577.h> 12 #include <linux/mfd/max14577-private.h> 13 #include <linux/regulator/of_regulator.h> 14 15 static int max14577_reg_is_enabled(struct regulator_dev *rdev) 16 { 17 int rid = rdev_get_id(rdev); 18 struct regmap *rmap = rdev->regmap; 19 u8 reg_data; 20 21 switch (rid) { 22 case MAX14577_CHARGER: 23 max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data); 24 if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) 25 return 0; 26 max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); 27 if ((reg_data & STATUS3_CGMBC_MASK) == 0) 28 return 0; 29 /* MBCHOSTEN and CGMBC are on */ 30 return 1; 31 default: 32 return -EINVAL; 33 } 34 } 35 36 static int max14577_reg_get_current_limit(struct regulator_dev *rdev) 37 { 38 u8 reg_data; 39 struct regmap *rmap = rdev->regmap; 40 struct max14577 *max14577 = rdev_get_drvdata(rdev); 41 const struct maxim_charger_current *limits = 42 &maxim_charger_currents[max14577->dev_type]; 43 int ret; 44 45 if (rdev_get_id(rdev) != MAX14577_CHARGER) 46 return -EINVAL; 47 48 ret = max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data); 49 if (ret < 0) 50 return ret; 51 52 if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0) 53 return limits->min; 54 55 reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >> 56 CHGCTRL4_MBCICHWRCH_SHIFT); 57 return limits->high_start + reg_data * limits->high_step; 58 } 59 60 static int max14577_reg_set_current_limit(struct regulator_dev *rdev, 61 int min_uA, int max_uA) 62 { 63 u8 reg_data; 64 int ret; 65 struct max14577 *max14577 = rdev_get_drvdata(rdev); 66 const struct maxim_charger_current *limits = 67 &maxim_charger_currents[max14577->dev_type]; 68 69 if (rdev_get_id(rdev) != MAX14577_CHARGER) 70 return -EINVAL; 71 72 ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, ®_data); 73 if (ret) 74 return ret; 75 76 return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4, 77 CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, 78 reg_data); 79 } 80 81 static const struct regulator_ops max14577_safeout_ops = { 82 .is_enabled = regulator_is_enabled_regmap, 83 .enable = regulator_enable_regmap, 84 .disable = regulator_disable_regmap, 85 .list_voltage = regulator_list_voltage_linear, 86 }; 87 88 static const struct regulator_ops max14577_charger_ops = { 89 .is_enabled = max14577_reg_is_enabled, 90 .enable = regulator_enable_regmap, 91 .disable = regulator_disable_regmap, 92 .get_current_limit = max14577_reg_get_current_limit, 93 .set_current_limit = max14577_reg_set_current_limit, 94 }; 95 96 #define MAX14577_SAFEOUT_REG { \ 97 .name = "SAFEOUT", \ 98 .of_match = of_match_ptr("SAFEOUT"), \ 99 .regulators_node = of_match_ptr("regulators"), \ 100 .id = MAX14577_SAFEOUT, \ 101 .ops = &max14577_safeout_ops, \ 102 .type = REGULATOR_VOLTAGE, \ 103 .owner = THIS_MODULE, \ 104 .n_voltages = 1, \ 105 .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, \ 106 .enable_reg = MAX14577_REG_CONTROL2, \ 107 .enable_mask = CTRL2_SFOUTORD_MASK, \ 108 } 109 #define MAX14577_CHARGER_REG { \ 110 .name = "CHARGER", \ 111 .of_match = of_match_ptr("CHARGER"), \ 112 .regulators_node = of_match_ptr("regulators"), \ 113 .id = MAX14577_CHARGER, \ 114 .ops = &max14577_charger_ops, \ 115 .type = REGULATOR_CURRENT, \ 116 .owner = THIS_MODULE, \ 117 .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, \ 118 .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, \ 119 } 120 121 static const struct regulator_desc max14577_supported_regulators[] = { 122 [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, 123 [MAX14577_CHARGER] = MAX14577_CHARGER_REG, 124 }; 125 126 static const struct regulator_ops max77836_ldo_ops = { 127 .is_enabled = regulator_is_enabled_regmap, 128 .enable = regulator_enable_regmap, 129 .disable = regulator_disable_regmap, 130 .list_voltage = regulator_list_voltage_linear, 131 .map_voltage = regulator_map_voltage_linear, 132 .get_voltage_sel = regulator_get_voltage_sel_regmap, 133 .set_voltage_sel = regulator_set_voltage_sel_regmap, 134 /* TODO: add .set_suspend_mode */ 135 }; 136 137 #define MAX77836_LDO_REG(num) { \ 138 .name = "LDO" # num, \ 139 .of_match = of_match_ptr("LDO" # num), \ 140 .regulators_node = of_match_ptr("regulators"), \ 141 .id = MAX77836_LDO ## num, \ 142 .ops = &max77836_ldo_ops, \ 143 .type = REGULATOR_VOLTAGE, \ 144 .owner = THIS_MODULE, \ 145 .n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \ 146 .min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \ 147 .uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \ 148 .enable_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ 149 .enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK, \ 150 .vsel_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ 151 .vsel_mask = MAX77836_CNFG1_LDO_TV_MASK, \ 152 } 153 154 static const struct regulator_desc max77836_supported_regulators[] = { 155 [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, 156 [MAX14577_CHARGER] = MAX14577_CHARGER_REG, 157 [MAX77836_LDO1] = MAX77836_LDO_REG(1), 158 [MAX77836_LDO2] = MAX77836_LDO_REG(2), 159 }; 160 161 /* 162 * Registers for regulators of max77836 use different I2C slave addresses so 163 * different regmaps must be used for them. 164 * 165 * Returns proper regmap for accessing regulator passed by id. 166 */ 167 static struct regmap *max14577_get_regmap(struct max14577 *max14577, 168 int reg_id) 169 { 170 switch (max14577->dev_type) { 171 case MAXIM_DEVICE_TYPE_MAX77836: 172 switch (reg_id) { 173 case MAX77836_SAFEOUT ... MAX77836_CHARGER: 174 return max14577->regmap; 175 default: 176 /* MAX77836_LDO1 ... MAX77836_LDO2 */ 177 return max14577->regmap_pmic; 178 } 179 180 case MAXIM_DEVICE_TYPE_MAX14577: 181 default: 182 return max14577->regmap; 183 } 184 } 185 186 static int max14577_regulator_probe(struct platform_device *pdev) 187 { 188 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); 189 struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev); 190 int i, ret = 0; 191 struct regulator_config config = {}; 192 const struct regulator_desc *supported_regulators; 193 unsigned int supported_regulators_size; 194 enum maxim_device_type dev_type = max14577->dev_type; 195 196 switch (dev_type) { 197 case MAXIM_DEVICE_TYPE_MAX77836: 198 supported_regulators = max77836_supported_regulators; 199 supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators); 200 break; 201 case MAXIM_DEVICE_TYPE_MAX14577: 202 default: 203 supported_regulators = max14577_supported_regulators; 204 supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators); 205 } 206 207 config.dev = max14577->dev; 208 config.driver_data = max14577; 209 210 for (i = 0; i < supported_regulators_size; i++) { 211 struct regulator_dev *regulator; 212 /* 213 * Index of supported_regulators[] is also the id and must 214 * match index of pdata->regulators[]. 215 */ 216 if (pdata && pdata->regulators) { 217 config.init_data = pdata->regulators[i].initdata; 218 config.of_node = pdata->regulators[i].of_node; 219 } 220 config.regmap = max14577_get_regmap(max14577, 221 supported_regulators[i].id); 222 223 regulator = devm_regulator_register(&pdev->dev, 224 &supported_regulators[i], &config); 225 if (IS_ERR(regulator)) { 226 ret = PTR_ERR(regulator); 227 dev_err(&pdev->dev, 228 "Regulator init failed for %d/%s with error: %d\n", 229 i, supported_regulators[i].name, ret); 230 return ret; 231 } 232 } 233 234 return ret; 235 } 236 237 static const struct platform_device_id max14577_regulator_id[] = { 238 { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, }, 239 { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, }, 240 { } 241 }; 242 MODULE_DEVICE_TABLE(platform, max14577_regulator_id); 243 244 static struct platform_driver max14577_regulator_driver = { 245 .driver = { 246 .name = "max14577-regulator", 247 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 248 }, 249 .probe = max14577_regulator_probe, 250 .id_table = max14577_regulator_id, 251 }; 252 253 static int __init max14577_regulator_init(void) 254 { 255 BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM); 256 BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM); 257 258 BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN + 259 (MAX77836_REGULATOR_LDO_VOLTAGE_STEP * 260 (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) != 261 MAX77836_REGULATOR_LDO_VOLTAGE_MAX); 262 263 return platform_driver_register(&max14577_regulator_driver); 264 } 265 subsys_initcall(max14577_regulator_init); 266 267 static void __exit max14577_regulator_exit(void) 268 { 269 platform_driver_unregister(&max14577_regulator_driver); 270 } 271 module_exit(max14577_regulator_exit); 272 273 MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>"); 274 MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver"); 275 MODULE_LICENSE("GPL"); 276