1 /* 2 * max14577.c - Regulator driver for the Maxim 14577/77836 3 * 4 * Copyright (C) 2013,2014 Samsung Electronics 5 * Krzysztof Kozlowski <k.kozlowski@samsung.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 */ 17 18 #include <linux/module.h> 19 #include <linux/platform_device.h> 20 #include <linux/regulator/driver.h> 21 #include <linux/mfd/max14577.h> 22 #include <linux/mfd/max14577-private.h> 23 #include <linux/regulator/of_regulator.h> 24 25 static int max14577_reg_is_enabled(struct regulator_dev *rdev) 26 { 27 int rid = rdev_get_id(rdev); 28 struct regmap *rmap = rdev->regmap; 29 u8 reg_data; 30 31 switch (rid) { 32 case MAX14577_CHARGER: 33 max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data); 34 if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) 35 return 0; 36 max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data); 37 if ((reg_data & STATUS3_CGMBC_MASK) == 0) 38 return 0; 39 /* MBCHOSTEN and CGMBC are on */ 40 return 1; 41 default: 42 return -EINVAL; 43 } 44 } 45 46 static int max14577_reg_get_current_limit(struct regulator_dev *rdev) 47 { 48 u8 reg_data; 49 struct regmap *rmap = rdev->regmap; 50 struct max14577 *max14577 = rdev_get_drvdata(rdev); 51 const struct maxim_charger_current *limits = 52 &maxim_charger_currents[max14577->dev_type]; 53 54 if (rdev_get_id(rdev) != MAX14577_CHARGER) 55 return -EINVAL; 56 57 max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL4, ®_data); 58 59 if ((reg_data & CHGCTRL4_MBCICHWRCL_MASK) == 0) 60 return limits->min; 61 62 reg_data = ((reg_data & CHGCTRL4_MBCICHWRCH_MASK) >> 63 CHGCTRL4_MBCICHWRCH_SHIFT); 64 return limits->high_start + reg_data * limits->high_step; 65 } 66 67 static int max14577_reg_set_current_limit(struct regulator_dev *rdev, 68 int min_uA, int max_uA) 69 { 70 u8 reg_data; 71 int ret; 72 struct max14577 *max14577 = rdev_get_drvdata(rdev); 73 const struct maxim_charger_current *limits = 74 &maxim_charger_currents[max14577->dev_type]; 75 76 if (rdev_get_id(rdev) != MAX14577_CHARGER) 77 return -EINVAL; 78 79 ret = maxim_charger_calc_reg_current(limits, min_uA, max_uA, ®_data); 80 if (ret) 81 return ret; 82 83 return max14577_update_reg(rdev->regmap, MAX14577_CHG_REG_CHG_CTRL4, 84 CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK, 85 reg_data); 86 } 87 88 static struct regulator_ops max14577_safeout_ops = { 89 .is_enabled = regulator_is_enabled_regmap, 90 .enable = regulator_enable_regmap, 91 .disable = regulator_disable_regmap, 92 .list_voltage = regulator_list_voltage_linear, 93 }; 94 95 static struct regulator_ops max14577_charger_ops = { 96 .is_enabled = max14577_reg_is_enabled, 97 .enable = regulator_enable_regmap, 98 .disable = regulator_disable_regmap, 99 .get_current_limit = max14577_reg_get_current_limit, 100 .set_current_limit = max14577_reg_set_current_limit, 101 }; 102 103 #define MAX14577_SAFEOUT_REG { \ 104 .name = "SAFEOUT", \ 105 .of_match = of_match_ptr("SAFEOUT"), \ 106 .regulators_node = of_match_ptr("regulators"), \ 107 .id = MAX14577_SAFEOUT, \ 108 .ops = &max14577_safeout_ops, \ 109 .type = REGULATOR_VOLTAGE, \ 110 .owner = THIS_MODULE, \ 111 .n_voltages = 1, \ 112 .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, \ 113 .enable_reg = MAX14577_REG_CONTROL2, \ 114 .enable_mask = CTRL2_SFOUTORD_MASK, \ 115 } 116 #define MAX14577_CHARGER_REG { \ 117 .name = "CHARGER", \ 118 .of_match = of_match_ptr("CHARGER"), \ 119 .regulators_node = of_match_ptr("regulators"), \ 120 .id = MAX14577_CHARGER, \ 121 .ops = &max14577_charger_ops, \ 122 .type = REGULATOR_CURRENT, \ 123 .owner = THIS_MODULE, \ 124 .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, \ 125 .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, \ 126 } 127 128 static const struct regulator_desc max14577_supported_regulators[] = { 129 [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, 130 [MAX14577_CHARGER] = MAX14577_CHARGER_REG, 131 }; 132 133 static struct regulator_ops max77836_ldo_ops = { 134 .is_enabled = regulator_is_enabled_regmap, 135 .enable = regulator_enable_regmap, 136 .disable = regulator_disable_regmap, 137 .list_voltage = regulator_list_voltage_linear, 138 .map_voltage = regulator_map_voltage_linear, 139 .get_voltage_sel = regulator_get_voltage_sel_regmap, 140 .set_voltage_sel = regulator_set_voltage_sel_regmap, 141 /* TODO: add .set_suspend_mode */ 142 }; 143 144 #define MAX77836_LDO_REG(num) { \ 145 .name = "LDO" # num, \ 146 .of_match = of_match_ptr("LDO" # num), \ 147 .regulators_node = of_match_ptr("regulators"), \ 148 .id = MAX77836_LDO ## num, \ 149 .ops = &max77836_ldo_ops, \ 150 .type = REGULATOR_VOLTAGE, \ 151 .owner = THIS_MODULE, \ 152 .n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, \ 153 .min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, \ 154 .uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, \ 155 .enable_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ 156 .enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK, \ 157 .vsel_reg = MAX77836_LDO_REG_CNFG1_LDO ## num, \ 158 .vsel_mask = MAX77836_CNFG1_LDO_TV_MASK, \ 159 } 160 161 static const struct regulator_desc max77836_supported_regulators[] = { 162 [MAX14577_SAFEOUT] = MAX14577_SAFEOUT_REG, 163 [MAX14577_CHARGER] = MAX14577_CHARGER_REG, 164 [MAX77836_LDO1] = MAX77836_LDO_REG(1), 165 [MAX77836_LDO2] = MAX77836_LDO_REG(2), 166 }; 167 168 #ifdef CONFIG_OF 169 static struct of_regulator_match max14577_regulator_matches[] = { 170 { .name = "SAFEOUT", }, 171 { .name = "CHARGER", }, 172 }; 173 174 static struct of_regulator_match max77836_regulator_matches[] = { 175 { .name = "SAFEOUT", }, 176 { .name = "CHARGER", }, 177 { .name = "LDO1", }, 178 { .name = "LDO2", }, 179 }; 180 181 static inline struct regulator_init_data *match_init_data(int index, 182 enum maxim_device_type dev_type) 183 { 184 switch (dev_type) { 185 case MAXIM_DEVICE_TYPE_MAX77836: 186 return max77836_regulator_matches[index].init_data; 187 188 case MAXIM_DEVICE_TYPE_MAX14577: 189 default: 190 return max14577_regulator_matches[index].init_data; 191 } 192 } 193 194 static inline struct device_node *match_of_node(int index, 195 enum maxim_device_type dev_type) 196 { 197 switch (dev_type) { 198 case MAXIM_DEVICE_TYPE_MAX77836: 199 return max77836_regulator_matches[index].of_node; 200 201 case MAXIM_DEVICE_TYPE_MAX14577: 202 default: 203 return max14577_regulator_matches[index].of_node; 204 } 205 } 206 #else /* CONFIG_OF */ 207 static inline struct regulator_init_data *match_init_data(int index, 208 enum maxim_device_type dev_type) 209 { 210 return NULL; 211 } 212 213 static inline struct device_node *match_of_node(int index, 214 enum maxim_device_type dev_type) 215 { 216 return NULL; 217 } 218 #endif /* CONFIG_OF */ 219 220 /** 221 * Registers for regulators of max77836 use different I2C slave addresses so 222 * different regmaps must be used for them. 223 * 224 * Returns proper regmap for accessing regulator passed by id. 225 */ 226 static struct regmap *max14577_get_regmap(struct max14577 *max14577, 227 int reg_id) 228 { 229 switch (max14577->dev_type) { 230 case MAXIM_DEVICE_TYPE_MAX77836: 231 switch (reg_id) { 232 case MAX77836_SAFEOUT ... MAX77836_CHARGER: 233 return max14577->regmap; 234 default: 235 /* MAX77836_LDO1 ... MAX77836_LDO2 */ 236 return max14577->regmap_pmic; 237 } 238 239 case MAXIM_DEVICE_TYPE_MAX14577: 240 default: 241 return max14577->regmap; 242 } 243 } 244 245 static int max14577_regulator_probe(struct platform_device *pdev) 246 { 247 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); 248 struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev); 249 int i, ret = 0; 250 struct regulator_config config = {}; 251 const struct regulator_desc *supported_regulators; 252 unsigned int supported_regulators_size; 253 enum maxim_device_type dev_type = max14577->dev_type; 254 255 switch (dev_type) { 256 case MAXIM_DEVICE_TYPE_MAX77836: 257 supported_regulators = max77836_supported_regulators; 258 supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators); 259 break; 260 case MAXIM_DEVICE_TYPE_MAX14577: 261 default: 262 supported_regulators = max14577_supported_regulators; 263 supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators); 264 } 265 266 config.dev = max14577->dev; 267 config.driver_data = max14577; 268 269 for (i = 0; i < supported_regulators_size; i++) { 270 struct regulator_dev *regulator; 271 /* 272 * Index of supported_regulators[] is also the id and must 273 * match index of pdata->regulators[]. 274 */ 275 if (pdata && pdata->regulators) { 276 config.init_data = pdata->regulators[i].initdata; 277 config.of_node = pdata->regulators[i].of_node; 278 } else { 279 config.init_data = match_init_data(i, dev_type); 280 config.of_node = match_of_node(i, dev_type); 281 } 282 config.regmap = max14577_get_regmap(max14577, 283 supported_regulators[i].id); 284 285 regulator = devm_regulator_register(&pdev->dev, 286 &supported_regulators[i], &config); 287 if (IS_ERR(regulator)) { 288 ret = PTR_ERR(regulator); 289 dev_err(&pdev->dev, 290 "Regulator init failed for %d/%s with error: %d\n", 291 i, supported_regulators[i].name, ret); 292 return ret; 293 } 294 } 295 296 return ret; 297 } 298 299 static const struct platform_device_id max14577_regulator_id[] = { 300 { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, }, 301 { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, }, 302 { } 303 }; 304 MODULE_DEVICE_TABLE(platform, max14577_regulator_id); 305 306 static struct platform_driver max14577_regulator_driver = { 307 .driver = { 308 .name = "max14577-regulator", 309 }, 310 .probe = max14577_regulator_probe, 311 .id_table = max14577_regulator_id, 312 }; 313 314 static int __init max14577_regulator_init(void) 315 { 316 BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM); 317 BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM); 318 319 BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN + 320 (MAX77836_REGULATOR_LDO_VOLTAGE_STEP * 321 (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) != 322 MAX77836_REGULATOR_LDO_VOLTAGE_MAX); 323 324 return platform_driver_register(&max14577_regulator_driver); 325 } 326 subsys_initcall(max14577_regulator_init); 327 328 static void __exit max14577_regulator_exit(void) 329 { 330 platform_driver_unregister(&max14577_regulator_driver); 331 } 332 module_exit(max14577_regulator_exit); 333 334 MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>"); 335 MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver"); 336 MODULE_LICENSE("GPL"); 337 MODULE_ALIAS("platform:max14577-regulator"); 338