1 /* 2 * max8907-regulator.c -- support regulators in max8907 3 * 4 * Copyright (C) 2010 Gyungoh Yoo <jack.yoo@maxim-ic.com> 5 * Copyright (C) 2010-2012, NVIDIA CORPORATION. All rights reserved. 6 * 7 * Portions based on drivers/regulator/tps65910-regulator.c, 8 * Copyright 2010 Texas Instruments Inc. 9 * Author: Graeme Gregory <gg@slimlogic.co.uk> 10 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk> 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License version 2 as 14 * published by the Free Software Foundation. 15 */ 16 17 #include <linux/err.h> 18 #include <linux/init.h> 19 #include <linux/mfd/core.h> 20 #include <linux/mfd/max8907.h> 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/platform_device.h> 24 #include <linux/regulator/driver.h> 25 #include <linux/regulator/machine.h> 26 #include <linux/regulator/of_regulator.h> 27 #include <linux/regmap.h> 28 #include <linux/slab.h> 29 30 #define MAX8907_II2RR_VERSION_MASK 0xF0 31 #define MAX8907_II2RR_VERSION_REV_A 0x00 32 #define MAX8907_II2RR_VERSION_REV_B 0x10 33 #define MAX8907_II2RR_VERSION_REV_C 0x30 34 35 struct max8907_regulator { 36 struct regulator_desc desc[MAX8907_NUM_REGULATORS]; 37 struct regulator_dev *rdev[MAX8907_NUM_REGULATORS]; 38 }; 39 40 #define REG_MBATT() \ 41 [MAX8907_MBATT] = { \ 42 .name = "MBATT", \ 43 .supply_name = "mbatt", \ 44 .id = MAX8907_MBATT, \ 45 .ops = &max8907_mbatt_ops, \ 46 .type = REGULATOR_VOLTAGE, \ 47 .owner = THIS_MODULE, \ 48 } 49 50 #define REG_LDO(ids, supply, base, min, max, step) \ 51 [MAX8907_##ids] = { \ 52 .name = #ids, \ 53 .supply_name = supply, \ 54 .id = MAX8907_##ids, \ 55 .n_voltages = ((max) - (min)) / (step) + 1, \ 56 .ops = &max8907_ldo_ops, \ 57 .type = REGULATOR_VOLTAGE, \ 58 .owner = THIS_MODULE, \ 59 .min_uV = (min), \ 60 .uV_step = (step), \ 61 .vsel_reg = (base) + MAX8907_VOUT, \ 62 .vsel_mask = 0x3f, \ 63 .enable_reg = (base) + MAX8907_CTL, \ 64 .enable_mask = MAX8907_MASK_LDO_EN, \ 65 } 66 67 #define REG_FIXED(ids, supply, voltage) \ 68 [MAX8907_##ids] = { \ 69 .name = #ids, \ 70 .supply_name = supply, \ 71 .id = MAX8907_##ids, \ 72 .n_voltages = 1, \ 73 .ops = &max8907_fixed_ops, \ 74 .type = REGULATOR_VOLTAGE, \ 75 .owner = THIS_MODULE, \ 76 .min_uV = (voltage), \ 77 } 78 79 #define REG_OUT5V(ids, supply, base, voltage) \ 80 [MAX8907_##ids] = { \ 81 .name = #ids, \ 82 .supply_name = supply, \ 83 .id = MAX8907_##ids, \ 84 .n_voltages = 1, \ 85 .ops = &max8907_out5v_ops, \ 86 .type = REGULATOR_VOLTAGE, \ 87 .owner = THIS_MODULE, \ 88 .min_uV = (voltage), \ 89 .enable_reg = (base), \ 90 .enable_mask = MAX8907_MASK_OUT5V_EN, \ 91 } 92 93 #define REG_BBAT(ids, supply, base, min, max, step) \ 94 [MAX8907_##ids] = { \ 95 .name = #ids, \ 96 .supply_name = supply, \ 97 .id = MAX8907_##ids, \ 98 .n_voltages = ((max) - (min)) / (step) + 1, \ 99 .ops = &max8907_bbat_ops, \ 100 .type = REGULATOR_VOLTAGE, \ 101 .owner = THIS_MODULE, \ 102 .min_uV = (min), \ 103 .uV_step = (step), \ 104 .vsel_reg = (base), \ 105 .vsel_mask = MAX8907_MASK_VBBATTCV, \ 106 } 107 108 #define LDO_750_50(id, supply, base) REG_LDO(id, supply, (base), \ 109 750000, 3900000, 50000) 110 #define LDO_650_25(id, supply, base) REG_LDO(id, supply, (base), \ 111 650000, 2225000, 25000) 112 113 static struct regulator_ops max8907_mbatt_ops = { 114 }; 115 116 static struct regulator_ops max8907_ldo_ops = { 117 .list_voltage = regulator_list_voltage_linear, 118 .set_voltage_sel = regulator_set_voltage_sel_regmap, 119 .get_voltage_sel = regulator_get_voltage_sel_regmap, 120 .enable = regulator_enable_regmap, 121 .disable = regulator_disable_regmap, 122 .is_enabled = regulator_is_enabled_regmap, 123 }; 124 125 static struct regulator_ops max8907_ldo_hwctl_ops = { 126 .list_voltage = regulator_list_voltage_linear, 127 .set_voltage_sel = regulator_set_voltage_sel_regmap, 128 .get_voltage_sel = regulator_get_voltage_sel_regmap, 129 }; 130 131 static struct regulator_ops max8907_fixed_ops = { 132 .list_voltage = regulator_list_voltage_linear, 133 }; 134 135 static struct regulator_ops max8907_out5v_ops = { 136 .list_voltage = regulator_list_voltage_linear, 137 .enable = regulator_enable_regmap, 138 .disable = regulator_disable_regmap, 139 .is_enabled = regulator_is_enabled_regmap, 140 }; 141 142 static struct regulator_ops max8907_out5v_hwctl_ops = { 143 .list_voltage = regulator_list_voltage_linear, 144 }; 145 146 static struct regulator_ops max8907_bbat_ops = { 147 .list_voltage = regulator_list_voltage_linear, 148 .set_voltage_sel = regulator_set_voltage_sel_regmap, 149 .get_voltage_sel = regulator_get_voltage_sel_regmap, 150 }; 151 152 static struct regulator_desc max8907_regulators[] = { 153 REG_MBATT(), 154 REG_LDO(SD1, "in-v1", MAX8907_REG_SDCTL1, 650000, 2225000, 25000), 155 REG_LDO(SD2, "in-v2", MAX8907_REG_SDCTL2, 637500, 1425000, 12500), 156 REG_LDO(SD3, "in-v3", MAX8907_REG_SDCTL3, 750000, 3900000, 50000), 157 LDO_750_50(LDO1, "in1", MAX8907_REG_LDOCTL1), 158 LDO_650_25(LDO2, "in2", MAX8907_REG_LDOCTL2), 159 LDO_650_25(LDO3, "in3", MAX8907_REG_LDOCTL3), 160 LDO_750_50(LDO4, "in4", MAX8907_REG_LDOCTL4), 161 LDO_750_50(LDO5, "in5", MAX8907_REG_LDOCTL5), 162 LDO_750_50(LDO6, "in6", MAX8907_REG_LDOCTL6), 163 LDO_750_50(LDO7, "in7", MAX8907_REG_LDOCTL7), 164 LDO_750_50(LDO8, "in8", MAX8907_REG_LDOCTL8), 165 LDO_750_50(LDO9, "in9", MAX8907_REG_LDOCTL9), 166 LDO_750_50(LDO10, "in10", MAX8907_REG_LDOCTL10), 167 LDO_750_50(LDO11, "in11", MAX8907_REG_LDOCTL11), 168 LDO_750_50(LDO12, "in12", MAX8907_REG_LDOCTL12), 169 LDO_750_50(LDO13, "in13", MAX8907_REG_LDOCTL13), 170 LDO_750_50(LDO14, "in14", MAX8907_REG_LDOCTL14), 171 LDO_750_50(LDO15, "in15", MAX8907_REG_LDOCTL15), 172 LDO_750_50(LDO16, "in16", MAX8907_REG_LDOCTL16), 173 LDO_650_25(LDO17, "in17", MAX8907_REG_LDOCTL17), 174 LDO_650_25(LDO18, "in18", MAX8907_REG_LDOCTL18), 175 LDO_750_50(LDO19, "in19", MAX8907_REG_LDOCTL19), 176 LDO_750_50(LDO20, "in20", MAX8907_REG_LDOCTL20), 177 REG_OUT5V(OUT5V, "mbatt", MAX8907_REG_OUT5VEN, 5000000), 178 REG_OUT5V(OUT33V, "mbatt", MAX8907_REG_OUT33VEN, 3300000), 179 REG_BBAT(BBAT, "MBATT", MAX8907_REG_BBAT_CNFG, 180 2400000, 3000000, 200000), 181 REG_FIXED(SDBY, "MBATT", 1200000), 182 REG_FIXED(VRTC, "MBATT", 3300000), 183 }; 184 185 #ifdef CONFIG_OF 186 187 #define MATCH(_name, _id) \ 188 [MAX8907_##_id] = { \ 189 .name = #_name, \ 190 .driver_data = (void *)&max8907_regulators[MAX8907_##_id], \ 191 } 192 193 static struct of_regulator_match max8907_matches[] = { 194 MATCH(mbatt, MBATT), 195 MATCH(sd1, SD1), 196 MATCH(sd2, SD2), 197 MATCH(sd3, SD3), 198 MATCH(ldo1, LDO1), 199 MATCH(ldo2, LDO2), 200 MATCH(ldo3, LDO3), 201 MATCH(ldo4, LDO4), 202 MATCH(ldo5, LDO5), 203 MATCH(ldo6, LDO6), 204 MATCH(ldo7, LDO7), 205 MATCH(ldo8, LDO8), 206 MATCH(ldo9, LDO9), 207 MATCH(ldo10, LDO10), 208 MATCH(ldo11, LDO11), 209 MATCH(ldo12, LDO12), 210 MATCH(ldo13, LDO13), 211 MATCH(ldo14, LDO14), 212 MATCH(ldo15, LDO15), 213 MATCH(ldo16, LDO16), 214 MATCH(ldo17, LDO17), 215 MATCH(ldo18, LDO18), 216 MATCH(ldo19, LDO19), 217 MATCH(ldo20, LDO20), 218 MATCH(out5v, OUT5V), 219 MATCH(out33v, OUT33V), 220 MATCH(bbat, BBAT), 221 MATCH(sdby, SDBY), 222 MATCH(vrtc, VRTC), 223 }; 224 225 static int max8907_regulator_parse_dt(struct platform_device *pdev) 226 { 227 struct device_node *np = pdev->dev.parent->of_node; 228 struct device_node *regulators; 229 int ret; 230 231 if (!pdev->dev.parent->of_node) 232 return 0; 233 234 regulators = of_find_node_by_name(np, "regulators"); 235 if (!regulators) { 236 dev_err(&pdev->dev, "regulators node not found\n"); 237 return -EINVAL; 238 } 239 240 ret = of_regulator_match(pdev->dev.parent, regulators, 241 max8907_matches, 242 ARRAY_SIZE(max8907_matches)); 243 if (ret < 0) { 244 dev_err(&pdev->dev, "Error parsing regulator init data: %d\n", 245 ret); 246 return ret; 247 } 248 249 return 0; 250 } 251 252 static inline struct regulator_init_data *match_init_data(int index) 253 { 254 return max8907_matches[index].init_data; 255 } 256 257 static inline struct device_node *match_of_node(int index) 258 { 259 return max8907_matches[index].of_node; 260 } 261 #else 262 static int max8907_regulator_parse_dt(struct platform_device *pdev) 263 { 264 return 0; 265 } 266 267 static inline struct regulator_init_data *match_init_data(int index) 268 { 269 return NULL; 270 } 271 272 static inline struct device_node *match_of_node(int index) 273 { 274 return NULL; 275 } 276 #endif 277 278 static int max8907_regulator_probe(struct platform_device *pdev) 279 { 280 struct max8907 *max8907 = dev_get_drvdata(pdev->dev.parent); 281 struct max8907_platform_data *pdata = dev_get_platdata(max8907->dev); 282 int ret; 283 struct max8907_regulator *pmic; 284 unsigned int val; 285 int i; 286 struct regulator_config config = {}; 287 struct regulator_init_data *idata; 288 const char *mbatt_rail_name = NULL; 289 290 ret = max8907_regulator_parse_dt(pdev); 291 if (ret) 292 return ret; 293 294 pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL); 295 if (!pmic) { 296 dev_err(&pdev->dev, "Failed to alloc pmic\n"); 297 return -ENOMEM; 298 } 299 platform_set_drvdata(pdev, pmic); 300 301 memcpy(pmic->desc, max8907_regulators, sizeof(pmic->desc)); 302 303 /* Backwards compatibility with MAX8907B; SD1 uses different voltages */ 304 regmap_read(max8907->regmap_gen, MAX8907_REG_II2RR, &val); 305 if ((val & MAX8907_II2RR_VERSION_MASK) == 306 MAX8907_II2RR_VERSION_REV_B) { 307 pmic->desc[MAX8907_SD1].min_uV = 637500; 308 pmic->desc[MAX8907_SD1].uV_step = 12500; 309 pmic->desc[MAX8907_SD1].n_voltages = 310 (1425000 - 637500) / 12500 + 1; 311 } 312 313 for (i = 0; i < MAX8907_NUM_REGULATORS; i++) { 314 config.dev = pdev->dev.parent; 315 if (pdata) 316 idata = pdata->init_data[i]; 317 else 318 idata = match_init_data(i); 319 config.init_data = idata; 320 config.driver_data = pmic; 321 config.regmap = max8907->regmap_gen; 322 config.of_node = match_of_node(i); 323 324 switch (pmic->desc[i].id) { 325 case MAX8907_MBATT: 326 if (idata && idata->constraints.name) 327 mbatt_rail_name = idata->constraints.name; 328 else 329 mbatt_rail_name = pmic->desc[i].name; 330 break; 331 case MAX8907_BBAT: 332 case MAX8907_SDBY: 333 case MAX8907_VRTC: 334 idata->supply_regulator = mbatt_rail_name; 335 break; 336 } 337 338 if (pmic->desc[i].ops == &max8907_ldo_ops) { 339 regmap_read(config.regmap, pmic->desc[i].enable_reg, 340 &val); 341 if ((val & MAX8907_MASK_LDO_SEQ) != 342 MAX8907_MASK_LDO_SEQ) 343 pmic->desc[i].ops = &max8907_ldo_hwctl_ops; 344 } else if (pmic->desc[i].ops == &max8907_out5v_ops) { 345 regmap_read(config.regmap, pmic->desc[i].enable_reg, 346 &val); 347 if ((val & (MAX8907_MASK_OUT5V_VINEN | 348 MAX8907_MASK_OUT5V_ENSRC)) != 349 MAX8907_MASK_OUT5V_ENSRC) 350 pmic->desc[i].ops = &max8907_out5v_hwctl_ops; 351 } 352 353 pmic->rdev[i] = regulator_register(&pmic->desc[i], &config); 354 if (IS_ERR(pmic->rdev[i])) { 355 dev_err(&pdev->dev, 356 "failed to register %s regulator\n", 357 pmic->desc[i].name); 358 ret = PTR_ERR(pmic->rdev[i]); 359 goto err_unregister_regulator; 360 } 361 } 362 363 return 0; 364 365 err_unregister_regulator: 366 while (--i >= 0) 367 regulator_unregister(pmic->rdev[i]); 368 return ret; 369 } 370 371 static int max8907_regulator_remove(struct platform_device *pdev) 372 { 373 struct max8907_regulator *pmic = platform_get_drvdata(pdev); 374 int i; 375 376 for (i = 0; i < MAX8907_NUM_REGULATORS; i++) 377 regulator_unregister(pmic->rdev[i]); 378 379 return 0; 380 } 381 382 static struct platform_driver max8907_regulator_driver = { 383 .driver = { 384 .name = "max8907-regulator", 385 .owner = THIS_MODULE, 386 }, 387 .probe = max8907_regulator_probe, 388 .remove = max8907_regulator_remove, 389 }; 390 391 static int __init max8907_regulator_init(void) 392 { 393 return platform_driver_register(&max8907_regulator_driver); 394 } 395 396 subsys_initcall(max8907_regulator_init); 397 398 static void __exit max8907_reg_exit(void) 399 { 400 platform_driver_unregister(&max8907_regulator_driver); 401 } 402 403 module_exit(max8907_reg_exit); 404 405 MODULE_DESCRIPTION("MAX8907 regulator driver"); 406 MODULE_AUTHOR("Gyungoh Yoo <jack.yoo@maxim-ic.com>"); 407 MODULE_LICENSE("GPL v2"); 408 MODULE_ALIAS("platform:max8907-regulator"); 409