drivers/regulator/max14577-regulator.c

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