drivers/regulator/max14577.c

   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, &reg_data);
  34                 if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
  35                         return 0;
  36                 max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, &reg_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, &reg_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, &reg_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 static const struct regulator_desc max14577_supported_regulators[] = {
 104         [MAX14577_SAFEOUT] = {
 105                 .name           = "SAFEOUT",
 106                 .of_match       = of_match_ptr("SAFEOUT"),
 107                 .regulators_node = of_match_ptr("regulators"),
 108                 .id             = MAX14577_SAFEOUT,
 109                 .ops            = &max14577_safeout_ops,
 110                 .type           = REGULATOR_VOLTAGE,
 111                 .owner          = THIS_MODULE,
 112                 .n_voltages     = 1,
 113                 .min_uV         = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
 114                 .enable_reg     = MAX14577_REG_CONTROL2,
 115                 .enable_mask    = CTRL2_SFOUTORD_MASK,
 116         },
 117         [MAX14577_CHARGER] = {
 118                 .name           = "CHARGER",
 119                 .of_match       = of_match_ptr("CHARGER"),
 120                 .regulators_node = of_match_ptr("regulators"),
 121                 .id             = MAX14577_CHARGER,
 122                 .ops            = &max14577_charger_ops,
 123                 .type           = REGULATOR_CURRENT,
 124                 .owner          = THIS_MODULE,
 125                 .enable_reg     = MAX14577_CHG_REG_CHG_CTRL2,
 126                 .enable_mask    = CHGCTRL2_MBCHOSTEN_MASK,
 127         },
 128 };
 129
 130 static struct regulator_ops max77836_ldo_ops = {
 131         .is_enabled             = regulator_is_enabled_regmap,
 132         .enable                 = regulator_enable_regmap,
 133         .disable                = regulator_disable_regmap,
 134         .list_voltage           = regulator_list_voltage_linear,
 135         .map_voltage            = regulator_map_voltage_linear,
 136         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 137         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 138         /* TODO: add .set_suspend_mode */
 139 };
 140
 141 static const struct regulator_desc max77836_supported_regulators[] = {
 142         [MAX14577_SAFEOUT] = {
 143                 .name           = "SAFEOUT",
 144                 .of_match       = of_match_ptr("SAFEOUT"),
 145                 .regulators_node = of_match_ptr("regulators"),
 146                 .id             = MAX14577_SAFEOUT,
 147                 .ops            = &max14577_safeout_ops,
 148                 .type           = REGULATOR_VOLTAGE,
 149                 .owner          = THIS_MODULE,
 150                 .n_voltages     = 1,
 151                 .min_uV         = MAX14577_REGULATOR_SAFEOUT_VOLTAGE,
 152                 .enable_reg     = MAX14577_REG_CONTROL2,
 153                 .enable_mask    = CTRL2_SFOUTORD_MASK,
 154         },
 155         [MAX14577_CHARGER] = {
 156                 .name           = "CHARGER",
 157                 .of_match       = of_match_ptr("CHARGER"),
 158                 .regulators_node = of_match_ptr("regulators"),
 159                 .id             = MAX14577_CHARGER,
 160                 .ops            = &max14577_charger_ops,
 161                 .type           = REGULATOR_CURRENT,
 162                 .owner          = THIS_MODULE,
 163                 .enable_reg     = MAX14577_CHG_REG_CHG_CTRL2,
 164                 .enable_mask    = CHGCTRL2_MBCHOSTEN_MASK,
 165         },
 166         [MAX77836_LDO1] = {
 167                 .name           = "LDO1",
 168                 .of_match       = of_match_ptr("LDO1"),
 169                 .regulators_node = of_match_ptr("regulators"),
 170                 .id             = MAX77836_LDO1,
 171                 .ops            = &max77836_ldo_ops,
 172                 .type           = REGULATOR_VOLTAGE,
 173                 .owner          = THIS_MODULE,
 174                 .n_voltages     = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
 175                 .min_uV         = MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
 176                 .uV_step        = MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
 177                 .enable_reg     = MAX77836_LDO_REG_CNFG1_LDO1,
 178                 .enable_mask    = MAX77836_CNFG1_LDO_PWRMD_MASK,
 179                 .vsel_reg       = MAX77836_LDO_REG_CNFG1_LDO1,
 180                 .vsel_mask      = MAX77836_CNFG1_LDO_TV_MASK,
 181         },
 182         [MAX77836_LDO2] = {
 183                 .name           = "LDO2",
 184                 .of_match       = of_match_ptr("LDO2"),
 185                 .regulators_node = of_match_ptr("regulators"),
 186                 .id             = MAX77836_LDO2,
 187                 .ops            = &max77836_ldo_ops,
 188                 .type           = REGULATOR_VOLTAGE,
 189                 .owner          = THIS_MODULE,
 190                 .n_voltages     = MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM,
 191                 .min_uV         = MAX77836_REGULATOR_LDO_VOLTAGE_MIN,
 192                 .uV_step        = MAX77836_REGULATOR_LDO_VOLTAGE_STEP,
 193                 .enable_reg     = MAX77836_LDO_REG_CNFG1_LDO2,
 194                 .enable_mask    = MAX77836_CNFG1_LDO_PWRMD_MASK,
 195                 .vsel_reg       = MAX77836_LDO_REG_CNFG1_LDO2,
 196                 .vsel_mask      = MAX77836_CNFG1_LDO_TV_MASK,
 197         },
 198 };
 199
 200 #ifdef CONFIG_OF
 201 static struct of_regulator_match max14577_regulator_matches[] = {
 202         { .name = "SAFEOUT", },
 203         { .name = "CHARGER", },
 204 };
 205
 206 static struct of_regulator_match max77836_regulator_matches[] = {
 207         { .name = "SAFEOUT", },
 208         { .name = "CHARGER", },
 209         { .name = "LDO1", },
 210         { .name = "LDO2", },
 211 };
 212
 213 static inline struct regulator_init_data *match_init_data(int index,
 214                 enum maxim_device_type dev_type)
 215 {
 216         switch (dev_type) {
 217         case MAXIM_DEVICE_TYPE_MAX77836:
 218                 return max77836_regulator_matches[index].init_data;
 219
 220         case MAXIM_DEVICE_TYPE_MAX14577:
 221         default:
 222                 return max14577_regulator_matches[index].init_data;
 223         }
 224 }
 225
 226 static inline struct device_node *match_of_node(int index,
 227                 enum maxim_device_type dev_type)
 228 {
 229         switch (dev_type) {
 230         case MAXIM_DEVICE_TYPE_MAX77836:
 231                 return max77836_regulator_matches[index].of_node;
 232
 233         case MAXIM_DEVICE_TYPE_MAX14577:
 234         default:
 235                 return max14577_regulator_matches[index].of_node;
 236         }
 237 }
 238 #else /* CONFIG_OF */
 239 static inline struct regulator_init_data *match_init_data(int index,
 240                 enum maxim_device_type dev_type)
 241 {
 242         return NULL;
 243 }
 244
 245 static inline struct device_node *match_of_node(int index,
 246                 enum maxim_device_type dev_type)
 247 {
 248         return NULL;
 249 }
 250 #endif /* CONFIG_OF */
 251
 252 /**
 253  * Registers for regulators of max77836 use different I2C slave addresses so
 254  * different regmaps must be used for them.
 255  *
 256  * Returns proper regmap for accessing regulator passed by id.
 257  */
 258 static struct regmap *max14577_get_regmap(struct max14577 *max14577,
 259                 int reg_id)
 260 {
 261         switch (max14577->dev_type) {
 262         case MAXIM_DEVICE_TYPE_MAX77836:
 263                 switch (reg_id) {
 264                 case MAX77836_SAFEOUT ... MAX77836_CHARGER:
 265                         return max14577->regmap;
 266                 default:
 267                         /* MAX77836_LDO1 ... MAX77836_LDO2 */
 268                         return max14577->regmap_pmic;
 269                 }
 270
 271         case MAXIM_DEVICE_TYPE_MAX14577:
 272         default:
 273                 return max14577->regmap;
 274         }
 275 }
 276
 277 static int max14577_regulator_probe(struct platform_device *pdev)
 278 {
 279         struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
 280         struct max14577_platform_data *pdata = dev_get_platdata(max14577->dev);
 281         int i, ret = 0;
 282         struct regulator_config config = {};
 283         const struct regulator_desc *supported_regulators;
 284         unsigned int supported_regulators_size;
 285         enum maxim_device_type dev_type = max14577->dev_type;
 286
 287         switch (dev_type) {
 288         case MAXIM_DEVICE_TYPE_MAX77836:
 289                 supported_regulators = max77836_supported_regulators;
 290                 supported_regulators_size = ARRAY_SIZE(max77836_supported_regulators);
 291                 break;
 292         case MAXIM_DEVICE_TYPE_MAX14577:
 293         default:
 294                 supported_regulators = max14577_supported_regulators;
 295                 supported_regulators_size = ARRAY_SIZE(max14577_supported_regulators);
 296         }
 297
 298         config.dev = max14577->dev;
 299         config.driver_data = max14577;
 300
 301         for (i = 0; i < supported_regulators_size; i++) {
 302                 struct regulator_dev *regulator;
 303                 /*
 304                  * Index of supported_regulators[] is also the id and must
 305                  * match index of pdata->regulators[].
 306                  */
 307                 if (pdata && pdata->regulators) {
 308                         config.init_data = pdata->regulators[i].initdata;
 309                         config.of_node = pdata->regulators[i].of_node;
 310                 } else {
 311                         config.init_data = match_init_data(i, dev_type);
 312                         config.of_node = match_of_node(i, dev_type);
 313                 }
 314                 config.regmap = max14577_get_regmap(max14577,
 315                                 supported_regulators[i].id);
 316
 317                 regulator = devm_regulator_register(&pdev->dev,
 318                                 &supported_regulators[i], &config);
 319                 if (IS_ERR(regulator)) {
 320                         ret = PTR_ERR(regulator);
 321                         dev_err(&pdev->dev,
 322                                         "Regulator init failed for %d/%s with error: %d\n",
 323                                         i, supported_regulators[i].name, ret);
 324                         return ret;
 325                 }
 326         }
 327
 328         return ret;
 329 }
 330
 331 static const struct platform_device_id max14577_regulator_id[] = {
 332         { "max14577-regulator", MAXIM_DEVICE_TYPE_MAX14577, },
 333         { "max77836-regulator", MAXIM_DEVICE_TYPE_MAX77836, },
 334         { }
 335 };
 336 MODULE_DEVICE_TABLE(platform, max14577_regulator_id);
 337
 338 static struct platform_driver max14577_regulator_driver = {
 339         .driver = {
 340                    .name = "max14577-regulator",
 341                    },
 342         .probe          = max14577_regulator_probe,
 343         .id_table       = max14577_regulator_id,
 344 };
 345
 346 static int __init max14577_regulator_init(void)
 347 {
 348         BUILD_BUG_ON(ARRAY_SIZE(max14577_supported_regulators) != MAX14577_REGULATOR_NUM);
 349         BUILD_BUG_ON(ARRAY_SIZE(max77836_supported_regulators) != MAX77836_REGULATOR_NUM);
 350
 351         BUILD_BUG_ON(MAX77836_REGULATOR_LDO_VOLTAGE_MIN +
 352                         (MAX77836_REGULATOR_LDO_VOLTAGE_STEP *
 353                           (MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM - 1)) !=
 354                         MAX77836_REGULATOR_LDO_VOLTAGE_MAX);
 355
 356         return platform_driver_register(&max14577_regulator_driver);
 357 }
 358 subsys_initcall(max14577_regulator_init);
 359
 360 static void __exit max14577_regulator_exit(void)
 361 {
 362         platform_driver_unregister(&max14577_regulator_driver);
 363 }
 364 module_exit(max14577_regulator_exit);
 365
 366 MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
 367 MODULE_DESCRIPTION("Maxim 14577/77836 regulator driver");
 368 MODULE_LICENSE("GPL");
 369 MODULE_ALIAS("platform:max14577-regulator");