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 25static 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 46static 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 67static 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 88static 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 95static 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 103static const struct regulator_desc max14577_supported_regulators[] = { 104 [MAX14577_SAFEOUT] = { 105 .name = "SAFEOUT", 106 .id = MAX14577_SAFEOUT, 107 .ops = &max14577_safeout_ops, 108 .type = REGULATOR_VOLTAGE, 109 .owner = THIS_MODULE, 110 .n_voltages = 1, 111 .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, 112 .enable_reg = MAX14577_REG_CONTROL2, 113 .enable_mask = CTRL2_SFOUTORD_MASK, 114 }, 115 [MAX14577_CHARGER] = { 116 .name = "CHARGER", 117 .id = MAX14577_CHARGER, 118 .ops = &max14577_charger_ops, 119 .type = REGULATOR_CURRENT, 120 .owner = THIS_MODULE, 121 .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, 122 .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, 123 }, 124}; 125 126static 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 137static const struct regulator_desc max77836_supported_regulators[] = { 138 [MAX14577_SAFEOUT] = { 139 .name = "SAFEOUT", 140 .id = MAX14577_SAFEOUT, 141 .ops = &max14577_safeout_ops, 142 .type = REGULATOR_VOLTAGE, 143 .owner = THIS_MODULE, 144 .n_voltages = 1, 145 .min_uV = MAX14577_REGULATOR_SAFEOUT_VOLTAGE, 146 .enable_reg = MAX14577_REG_CONTROL2, 147 .enable_mask = CTRL2_SFOUTORD_MASK, 148 }, 149 [MAX14577_CHARGER] = { 150 .name = "CHARGER", 151 .id = MAX14577_CHARGER, 152 .ops = &max14577_charger_ops, 153 .type = REGULATOR_CURRENT, 154 .owner = THIS_MODULE, 155 .enable_reg = MAX14577_CHG_REG_CHG_CTRL2, 156 .enable_mask = CHGCTRL2_MBCHOSTEN_MASK, 157 }, 158 [MAX77836_LDO1] = { 159 .name = "LDO1", 160 .id = MAX77836_LDO1, 161 .ops = &max77836_ldo_ops, 162 .type = REGULATOR_VOLTAGE, 163 .owner = THIS_MODULE, 164 .n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, 165 .min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, 166 .uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, 167 .enable_reg = MAX77836_LDO_REG_CNFG1_LDO1, 168 .enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK, 169 .vsel_reg = MAX77836_LDO_REG_CNFG1_LDO1, 170 .vsel_mask = MAX77836_CNFG1_LDO_TV_MASK, 171 }, 172 [MAX77836_LDO2] = { 173 .name = "LDO2", 174 .id = MAX77836_LDO2, 175 .ops = &max77836_ldo_ops, 176 .type = REGULATOR_VOLTAGE, 177 .owner = THIS_MODULE, 178 .n_voltages = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM, 179 .min_uV = MAX77836_REGULATOR_LDO_VOLTAGE_MIN, 180 .uV_step = MAX77836_REGULATOR_LDO_VOLTAGE_STEP, 181 .enable_reg = MAX77836_LDO_REG_CNFG1_LDO2, 182 .enable_mask = MAX77836_CNFG1_LDO_PWRMD_MASK, 183 .vsel_reg = MAX77836_LDO_REG_CNFG1_LDO2, 184 .vsel_mask = MAX77836_CNFG1_LDO_TV_MASK, 185 }, 186}; 187 188#ifdef CONFIG_OF 189static struct of_regulator_match max14577_regulator_matches[] = { 190 { .name = "SAFEOUT", }, 191 { .name = "CHARGER", }, 192}; 193 194static struct of_regulator_match max77836_regulator_matches[] = { 195 { .name = "SAFEOUT", }, 196 { .name = "CHARGER", }, 197 { .name = "LDO1", }, 198 { .name = "LDO2", }, 199}; 200 201static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev, 202 enum maxim_device_type dev_type) 203{ 204 int ret; 205 struct device_node *np; 206 struct of_regulator_match *regulator_matches; 207 unsigned int regulator_matches_size; 208 209 np = of_get_child_by_name(pdev->dev.parent->of_node, "regulators"); 210 if (!np) { 211 dev_err(&pdev->dev, "Failed to get child OF node for regulators\n"); 212 return -EINVAL; 213 } 214 215 switch (dev_type) { 216 case MAXIM_DEVICE_TYPE_MAX77836: 217 regulator_matches = max77836_regulator_matches; 218 regulator_matches_size = ARRAY_SIZE(max77836_regulator_matches); 219 break; 220 case MAXIM_DEVICE_TYPE_MAX14577: 221 default: 222 regulator_matches = max14577_regulator_matches; 223 regulator_matches_size = ARRAY_SIZE(max14577_regulator_matches); 224 } 225 226 ret = of_regulator_match(&pdev->dev, np, regulator_matches, 227 regulator_matches_size); 228 if (ret < 0) 229 dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", ret); 230 else 231 ret = 0; 232 233 of_node_put(np); 234 235 return ret; 236} 237 238static inline struct regulator_init_data *match_init_data(int index, 239 enum maxim_device_type dev_type) 240{ 241 switch (dev_type) { 242 case MAXIM_DEVICE_TYPE_MAX77836: 243 return max77836_regulator_matches[index].init_data; 244 245 case MAXIM_DEVICE_TYPE_MAX14577: 246 default: 247 return max14577_regulator_matches[index].init_data; 248 } 249} 250 251static inline struct device_node *match_of_node(int index, 252 enum maxim_device_type dev_type) 253{ 254 switch (dev_type) { 255 case MAXIM_DEVICE_TYPE_MAX77836: 256 return max77836_regulator_matches[index].of_node; 257 258 case MAXIM_DEVICE_TYPE_MAX14577: 259 default: 260 return max14577_regulator_matches[index].of_node; 261 } 262} 263#else /* CONFIG_OF */ 264static int max14577_regulator_dt_parse_pdata(struct platform_device *pdev, 265 enum maxim_device_type dev_type) 266{ 267 return 0; 268} 269static inline struct regulator_init_data *match_init_data(int index, 270 enum maxim_device_type dev_type) 271{ 272 return NULL; 273} 274 275static inline struct device_node *match_of_node(int index, 276 enum maxim_device_type dev_type) 277{ 278 return NULL; 279} 280#endif /* CONFIG_OF */ 281 282/** 283 * Registers for regulators of max77836 use different I2C slave addresses so 284 * different regmaps must be used for them. 285 * 286 * Returns proper regmap for accessing regulator passed by id. 287 */ 288static struct regmap *max14577_get_regmap(struct max14577 *max14577, 289 int reg_id) 290{ 291 switch (max14577->dev_type) { 292 case MAXIM_DEVICE_TYPE_MAX77836: 293 switch (reg_id) { 294 case MAX77836_SAFEOUT ... MAX77836_CHARGER: 295 return max14577->regmap; 296 default: 297 /* MAX77836_LDO1 ... MAX77836_LDO2 */ 298 return max14577->regmap_pmic; 299 } 300 301 case MAXIM_DEVICE_TYPE_MAX14577: 302 default: 303 return max14577->regmap; 304 } 305} 306 307static int max14577_regulator_probe(struct platform_device *pdev) 308{ 309 struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent); 310 struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev); 311 int i, ret; 312 struct regulator_config config = {}; 313 const struct regulator_desc *supported_regulators; 314 unsigned int supported_regulators_size; 315 enum maxim_device_type dev_type = max14577->dev_type; 316 317 ret = max14577_regulator_dt_parse_pdata(pdev, dev_type); 318 if (ret) 319 return ret; 320 321 switch (dev_type) { 322 case MAXIM_DEVICE_TYPE_MAX77836: 323 supported_regulators = max77836_supported_regulators; 324 supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators); 325 break; 326 case MAXIM_DEVICE_TYPE_MAX14577: 327 default: 328 supported_regulators = max14577_supported_regulators; 329 supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators); 330 } 331 332 config.dev = &pdev->dev; 333 config.driver_data = max14577; 334 335 for (i = 0; i < supported_regulators_size; i++) { 336 struct regulator_dev *regulator; 337 /* 338 * Index of supported_regulators[] is also the id and must 339 * match index of pdata->regulators[]. 340 */ 341 if (pdata && pdata->regulators) { 342 config.init_data = pdata->regulators[i].initdata; 343 config.of_node = pdata->regulators[i].of_node; 344 } else { 345 config.init_data = match_init_data(i, dev_type); 346 config.of_node = match_of_node(i, dev_type); 347 } 348 config.regmap = max14577_get_regmap(max14577, 349 supported_regulators[i].id); 350 351 regulator = devm_regulator_register(&pdev->dev, 352 &supported_regulators[i], &config); 353 if (IS_ERR(regulator)) { 354 ret = PTR_ERR(regulator); 355 dev_err(&pdev->dev, 356 "Regulator init failed for %d/%s with error: %d\n", 357 i, supported_regulators[i].name, ret); 358 return ret; 359 } 360 } 361 362 return ret; 363} 364 365static const struct platform_device_id max14577_regulator_id[] = { 366 { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, }, 367 { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, }, 368 { } 369}; 370MODULE_DEVICE_TABLE(platform, max14577_regulator_id); 371 372static struct platform_driver max14577_regulator_driver = { 373 .driver = { 374 .owner = THIS_MODULE, 375 .name = "max14577-regulator", 376 }, 377 .probe = max14577_regulator_probe, 378 .id_table = max14577_regulator_id, 379}; 380 381static int __init max14577_regulator_init(void) 382{ 383 BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM); 384 BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM); 385 386 BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN + 387 (MAX77836_REGULATOR_LDO_VOLTAGE_STEP * 388 (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) != 389 MAX77836_REGULATOR_LDO_VOLTAGE_MAX); 390 391 return platform_driver_register(&max14577_regulator_driver); 392} 393subsys_initcall(max14577_regulator_init); 394 395static void __exit max14577_regulator_exit(void) 396{ 397 platform_driver_unregister(&max14577_regulator_driver); 398} 399module_exit(max14577_regulator_exit); 400 401MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>"); 402MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver"); 403MODULE_LICENSE("GPL"); 404MODULE_ALIAS("platform:max14577-regulator"); 405