drivers/regulator/max77650-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright (C) 2018 BayLibre SAS
   4 // Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
   5 //
   6 // Regulator driver for MAXIM 77650/77651 charger/power-supply.
   7
   8 #include <linux/of.h>
   9 #include <linux/mfd/max77650.h>
  10 #include <linux/module.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/regmap.h>
  13 #include <linux/regulator/driver.h>
  14
  15 #define MAX77650_REGULATOR_EN_CTRL_MASK         GENMASK(3, 0)
  16 #define MAX77650_REGULATOR_EN_CTRL_BITS(_reg) \
  17                 ((_reg) & MAX77650_REGULATOR_EN_CTRL_MASK)
  18 #define MAX77650_REGULATOR_ENABLED              GENMASK(2, 1)
  19 #define MAX77650_REGULATOR_DISABLED             BIT(2)
  20
  21 #define MAX77650_REGULATOR_V_LDO_MASK           GENMASK(6, 0)
  22 #define MAX77650_REGULATOR_V_SBB_MASK           GENMASK(5, 0)
  23 #define MAX77651_REGULATOR_V_SBB1_MASK          GENMASK(5, 2)
  24 #define MAX77651_REGULATOR_V_SBB1_RANGE_MASK    GENMASK(1, 0)
  25
  26 #define MAX77650_REGULATOR_AD_MASK              BIT(3)
  27 #define MAX77650_REGULATOR_AD_DISABLED          0x00
  28 #define MAX77650_REGULATOR_AD_ENABLED           BIT(3)
  29
  30 #define MAX77650_REGULATOR_CURR_LIM_MASK        GENMASK(7, 6)
  31
  32 enum {
  33         MAX77650_REGULATOR_ID_LDO = 0,
  34         MAX77650_REGULATOR_ID_SBB0,
  35         MAX77650_REGULATOR_ID_SBB1,
  36         MAX77650_REGULATOR_ID_SBB2,
  37         MAX77650_REGULATOR_NUM_REGULATORS,
  38 };
  39
  40 struct max77650_regulator_desc {
  41         struct regulator_desc desc;
  42         unsigned int regA;
  43         unsigned int regB;
  44 };
  45
  46 static const unsigned int max77651_sbb1_volt_range_sel[] = {
  47         0x0, 0x1, 0x2, 0x3
  48 };
  49
  50 static const struct linear_range max77651_sbb1_volt_ranges[] = {
  51         /* range index 0 */
  52         REGULATOR_LINEAR_RANGE(2400000, 0x00, 0x0f, 50000),
  53         /* range index 1 */
  54         REGULATOR_LINEAR_RANGE(3200000, 0x00, 0x0f, 50000),
  55         /* range index 2 */
  56         REGULATOR_LINEAR_RANGE(4000000, 0x00, 0x0f, 50000),
  57         /* range index 3 */
  58         REGULATOR_LINEAR_RANGE(4800000, 0x00, 0x09, 50000),
  59 };
  60
  61 static const unsigned int max77650_current_limit_table[] = {
  62         1000000, 866000, 707000, 500000,
  63 };
  64
  65 static int max77650_regulator_is_enabled(struct regulator_dev *rdev)
  66 {
  67         const struct max77650_regulator_desc *rdesc;
  68         struct regmap *map;
  69         int val, rv, en;
  70
  71         rdesc = container_of(rdev->desc, struct max77650_regulator_desc, desc);
  72         map = rdev_get_regmap(rdev);
  73
  74         rv = regmap_read(map, rdesc->regB, &val);
  75         if (rv)
  76                 return rv;
  77
  78         en = MAX77650_REGULATOR_EN_CTRL_BITS(val);
  79
  80         return en != MAX77650_REGULATOR_DISABLED;
  81 }
  82
  83 static int max77650_regulator_enable(struct regulator_dev *rdev)
  84 {
  85         const struct max77650_regulator_desc *rdesc;
  86         struct regmap *map;
  87
  88         rdesc = container_of(rdev->desc, struct max77650_regulator_desc, desc);
  89         map = rdev_get_regmap(rdev);
  90
  91         return regmap_update_bits(map, rdesc->regB,
  92                                   MAX77650_REGULATOR_EN_CTRL_MASK,
  93                                   MAX77650_REGULATOR_ENABLED);
  94 }
  95
  96 static int max77650_regulator_disable(struct regulator_dev *rdev)
  97 {
  98         const struct max77650_regulator_desc *rdesc;
  99         struct regmap *map;
 100
 101         rdesc = container_of(rdev->desc, struct max77650_regulator_desc, desc);
 102         map = rdev_get_regmap(rdev);
 103
 104         return regmap_update_bits(map, rdesc->regB,
 105                                   MAX77650_REGULATOR_EN_CTRL_MASK,
 106                                   MAX77650_REGULATOR_DISABLED);
 107 }
 108
 109 static const struct regulator_ops max77650_regulator_LDO_ops = {
 110         .is_enabled             = max77650_regulator_is_enabled,
 111         .enable                 = max77650_regulator_enable,
 112         .disable                = max77650_regulator_disable,
 113         .list_voltage           = regulator_list_voltage_linear,
 114         .map_voltage            = regulator_map_voltage_linear,
 115         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 116         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 117         .set_active_discharge   = regulator_set_active_discharge_regmap,
 118 };
 119
 120 static const struct regulator_ops max77650_regulator_SBB_ops = {
 121         .is_enabled             = max77650_regulator_is_enabled,
 122         .enable                 = max77650_regulator_enable,
 123         .disable                = max77650_regulator_disable,
 124         .list_voltage           = regulator_list_voltage_linear,
 125         .map_voltage            = regulator_map_voltage_linear,
 126         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 127         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 128         .get_current_limit      = regulator_get_current_limit_regmap,
 129         .set_current_limit      = regulator_set_current_limit_regmap,
 130         .set_active_discharge   = regulator_set_active_discharge_regmap,
 131 };
 132
 133 /* Special case for max77651 SBB1 - pickable linear-range voltage mapping. */
 134 static const struct regulator_ops max77651_SBB1_regulator_ops = {
 135         .is_enabled             = max77650_regulator_is_enabled,
 136         .enable                 = max77650_regulator_enable,
 137         .disable                = max77650_regulator_disable,
 138         .list_voltage           = regulator_list_voltage_pickable_linear_range,
 139         .get_voltage_sel        = regulator_get_voltage_sel_pickable_regmap,
 140         .set_voltage_sel        = regulator_set_voltage_sel_pickable_regmap,
 141         .get_current_limit      = regulator_get_current_limit_regmap,
 142         .set_current_limit      = regulator_set_current_limit_regmap,
 143         .set_active_discharge   = regulator_set_active_discharge_regmap,
 144 };
 145
 146 static const struct max77650_regulator_desc max77650_LDO_desc = {
 147         .desc = {
 148                 .name                   = "ldo",
 149                 .of_match               = of_match_ptr("ldo"),
 150                 .regulators_node        = of_match_ptr("regulators"),
 151                 .supply_name            = "in-ldo",
 152                 .id                     = MAX77650_REGULATOR_ID_LDO,
 153                 .ops                    = &max77650_regulator_LDO_ops,
 154                 .min_uV                 = 1350000,
 155                 .uV_step                = 12500,
 156                 .n_voltages             = 128,
 157                 .vsel_step              = 1,
 158                 .vsel_mask              = MAX77650_REGULATOR_V_LDO_MASK,
 159                 .vsel_reg               = MAX77650_REG_CNFG_LDO_A,
 160                 .active_discharge_off   = MAX77650_REGULATOR_AD_DISABLED,
 161                 .active_discharge_on    = MAX77650_REGULATOR_AD_ENABLED,
 162                 .active_discharge_mask  = MAX77650_REGULATOR_AD_MASK,
 163                 .active_discharge_reg   = MAX77650_REG_CNFG_LDO_B,
 164                 .enable_time            = 100,
 165                 .type                   = REGULATOR_VOLTAGE,
 166                 .owner                  = THIS_MODULE,
 167         },
 168         .regA           = MAX77650_REG_CNFG_LDO_A,
 169         .regB           = MAX77650_REG_CNFG_LDO_B,
 170 };
 171
 172 static const struct max77650_regulator_desc max77650_SBB0_desc = {
 173         .desc = {
 174                 .name                   = "sbb0",
 175                 .of_match               = of_match_ptr("sbb0"),
 176                 .regulators_node        = of_match_ptr("regulators"),
 177                 .supply_name            = "in-sbb0",
 178                 .id                     = MAX77650_REGULATOR_ID_SBB0,
 179                 .ops                    = &max77650_regulator_SBB_ops,
 180                 .min_uV                 = 800000,
 181                 .uV_step                = 25000,
 182                 .n_voltages             = 64,
 183                 .vsel_step              = 1,
 184                 .vsel_mask              = MAX77650_REGULATOR_V_SBB_MASK,
 185                 .vsel_reg               = MAX77650_REG_CNFG_SBB0_A,
 186                 .active_discharge_off   = MAX77650_REGULATOR_AD_DISABLED,
 187                 .active_discharge_on    = MAX77650_REGULATOR_AD_ENABLED,
 188                 .active_discharge_mask  = MAX77650_REGULATOR_AD_MASK,
 189                 .active_discharge_reg   = MAX77650_REG_CNFG_SBB0_B,
 190                 .enable_time            = 100,
 191                 .type                   = REGULATOR_VOLTAGE,
 192                 .owner                  = THIS_MODULE,
 193                 .csel_reg               = MAX77650_REG_CNFG_SBB0_A,
 194                 .csel_mask              = MAX77650_REGULATOR_CURR_LIM_MASK,
 195                 .curr_table             = max77650_current_limit_table,
 196                 .n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
 197         },
 198         .regA           = MAX77650_REG_CNFG_SBB0_A,
 199         .regB           = MAX77650_REG_CNFG_SBB0_B,
 200 };
 201
 202 static const struct max77650_regulator_desc max77650_SBB1_desc = {
 203         .desc = {
 204                 .name                   = "sbb1",
 205                 .of_match               = of_match_ptr("sbb1"),
 206                 .regulators_node        = of_match_ptr("regulators"),
 207                 .supply_name            = "in-sbb1",
 208                 .id                     = MAX77650_REGULATOR_ID_SBB1,
 209                 .ops                    = &max77650_regulator_SBB_ops,
 210                 .min_uV                 = 800000,
 211                 .uV_step                = 12500,
 212                 .n_voltages             = 64,
 213                 .vsel_step              = 1,
 214                 .vsel_mask              = MAX77650_REGULATOR_V_SBB_MASK,
 215                 .vsel_reg               = MAX77650_REG_CNFG_SBB1_A,
 216                 .active_discharge_off   = MAX77650_REGULATOR_AD_DISABLED,
 217                 .active_discharge_on    = MAX77650_REGULATOR_AD_ENABLED,
 218                 .active_discharge_mask  = MAX77650_REGULATOR_AD_MASK,
 219                 .active_discharge_reg   = MAX77650_REG_CNFG_SBB1_B,
 220                 .enable_time            = 100,
 221                 .type                   = REGULATOR_VOLTAGE,
 222                 .owner                  = THIS_MODULE,
 223                 .csel_reg               = MAX77650_REG_CNFG_SBB1_A,
 224                 .csel_mask              = MAX77650_REGULATOR_CURR_LIM_MASK,
 225                 .curr_table             = max77650_current_limit_table,
 226                 .n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
 227         },
 228         .regA           = MAX77650_REG_CNFG_SBB1_A,
 229         .regB           = MAX77650_REG_CNFG_SBB1_B,
 230 };
 231
 232 static const struct max77650_regulator_desc max77651_SBB1_desc = {
 233         .desc = {
 234                 .name                   = "sbb1",
 235                 .of_match               = of_match_ptr("sbb1"),
 236                 .regulators_node        = of_match_ptr("regulators"),
 237                 .supply_name            = "in-sbb1",
 238                 .id                     = MAX77650_REGULATOR_ID_SBB1,
 239                 .ops                    = &max77651_SBB1_regulator_ops,
 240                 .linear_range_selectors_bitfield        = max77651_sbb1_volt_range_sel,
 241                 .linear_ranges          = max77651_sbb1_volt_ranges,
 242                 .n_linear_ranges        = ARRAY_SIZE(max77651_sbb1_volt_ranges),
 243                 .n_voltages             = 58,
 244                 .vsel_step              = 1,
 245                 .vsel_range_mask        = MAX77651_REGULATOR_V_SBB1_RANGE_MASK,
 246                 .vsel_range_reg         = MAX77650_REG_CNFG_SBB1_A,
 247                 .vsel_mask              = MAX77651_REGULATOR_V_SBB1_MASK,
 248                 .vsel_reg               = MAX77650_REG_CNFG_SBB1_A,
 249                 .active_discharge_off   = MAX77650_REGULATOR_AD_DISABLED,
 250                 .active_discharge_on    = MAX77650_REGULATOR_AD_ENABLED,
 251                 .active_discharge_mask  = MAX77650_REGULATOR_AD_MASK,
 252                 .active_discharge_reg   = MAX77650_REG_CNFG_SBB1_B,
 253                 .enable_time            = 100,
 254                 .type                   = REGULATOR_VOLTAGE,
 255                 .owner                  = THIS_MODULE,
 256                 .csel_reg               = MAX77650_REG_CNFG_SBB1_A,
 257                 .csel_mask              = MAX77650_REGULATOR_CURR_LIM_MASK,
 258                 .curr_table             = max77650_current_limit_table,
 259                 .n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
 260         },
 261         .regA           = MAX77650_REG_CNFG_SBB1_A,
 262         .regB           = MAX77650_REG_CNFG_SBB1_B,
 263 };
 264
 265 static const struct max77650_regulator_desc max77650_SBB2_desc = {
 266         .desc = {
 267                 .name                   = "sbb2",
 268                 .of_match               = of_match_ptr("sbb2"),
 269                 .regulators_node        = of_match_ptr("regulators"),
 270                 .supply_name            = "in-sbb0",
 271                 .id                     = MAX77650_REGULATOR_ID_SBB2,
 272                 .ops                    = &max77650_regulator_SBB_ops,
 273                 .min_uV                 = 800000,
 274                 .uV_step                = 50000,
 275                 .n_voltages             = 64,
 276                 .vsel_step              = 1,
 277                 .vsel_mask              = MAX77650_REGULATOR_V_SBB_MASK,
 278                 .vsel_reg               = MAX77650_REG_CNFG_SBB2_A,
 279                 .active_discharge_off   = MAX77650_REGULATOR_AD_DISABLED,
 280                 .active_discharge_on    = MAX77650_REGULATOR_AD_ENABLED,
 281                 .active_discharge_mask  = MAX77650_REGULATOR_AD_MASK,
 282                 .active_discharge_reg   = MAX77650_REG_CNFG_SBB2_B,
 283                 .enable_time            = 100,
 284                 .type                   = REGULATOR_VOLTAGE,
 285                 .owner                  = THIS_MODULE,
 286                 .csel_reg               = MAX77650_REG_CNFG_SBB2_A,
 287                 .csel_mask              = MAX77650_REGULATOR_CURR_LIM_MASK,
 288                 .curr_table             = max77650_current_limit_table,
 289                 .n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
 290         },
 291         .regA           = MAX77650_REG_CNFG_SBB2_A,
 292         .regB           = MAX77650_REG_CNFG_SBB2_B,
 293 };
 294
 295 static const struct max77650_regulator_desc max77651_SBB2_desc = {
 296         .desc = {
 297                 .name                   = "sbb2",
 298                 .of_match               = of_match_ptr("sbb2"),
 299                 .regulators_node        = of_match_ptr("regulators"),
 300                 .supply_name            = "in-sbb0",
 301                 .id                     = MAX77650_REGULATOR_ID_SBB2,
 302                 .ops                    = &max77650_regulator_SBB_ops,
 303                 .min_uV                 = 2400000,
 304                 .uV_step                = 50000,
 305                 .n_voltages             = 64,
 306                 .vsel_step              = 1,
 307                 .vsel_mask              = MAX77650_REGULATOR_V_SBB_MASK,
 308                 .vsel_reg               = MAX77650_REG_CNFG_SBB2_A,
 309                 .active_discharge_off   = MAX77650_REGULATOR_AD_DISABLED,
 310                 .active_discharge_on    = MAX77650_REGULATOR_AD_ENABLED,
 311                 .active_discharge_mask  = MAX77650_REGULATOR_AD_MASK,
 312                 .active_discharge_reg   = MAX77650_REG_CNFG_SBB2_B,
 313                 .enable_time            = 100,
 314                 .type                   = REGULATOR_VOLTAGE,
 315                 .owner                  = THIS_MODULE,
 316                 .csel_reg               = MAX77650_REG_CNFG_SBB2_A,
 317                 .csel_mask              = MAX77650_REGULATOR_CURR_LIM_MASK,
 318                 .curr_table             = max77650_current_limit_table,
 319                 .n_current_limits = ARRAY_SIZE(max77650_current_limit_table),
 320         },
 321         .regA           = MAX77650_REG_CNFG_SBB2_A,
 322         .regB           = MAX77650_REG_CNFG_SBB2_B,
 323 };
 324
 325 static int max77650_regulator_probe(struct platform_device *pdev)
 326 {
 327         const struct max77650_regulator_desc **rdescs;
 328         const struct max77650_regulator_desc *rdesc;
 329         struct regulator_config config = { };
 330         struct device *dev, *parent;
 331         struct regulator_dev *rdev;
 332         struct regmap *map;
 333         unsigned int val;
 334         int i, rv;
 335
 336         dev = &pdev->dev;
 337         parent = dev->parent;
 338
 339         if (!dev->of_node)
 340                 dev->of_node = parent->of_node;
 341
 342         rdescs = devm_kcalloc(dev, MAX77650_REGULATOR_NUM_REGULATORS,
 343                               sizeof(*rdescs), GFP_KERNEL);
 344         if (!rdescs)
 345                 return -ENOMEM;
 346
 347         map = dev_get_regmap(parent, NULL);
 348         if (!map)
 349                 return -ENODEV;
 350
 351         rv = regmap_read(map, MAX77650_REG_CID, &val);
 352         if (rv)
 353                 return rv;
 354
 355         rdescs[MAX77650_REGULATOR_ID_LDO] = &max77650_LDO_desc;
 356         rdescs[MAX77650_REGULATOR_ID_SBB0] = &max77650_SBB0_desc;
 357
 358         switch (MAX77650_CID_BITS(val)) {
 359         case MAX77650_CID_77650A:
 360         case MAX77650_CID_77650C:
 361                 rdescs[MAX77650_REGULATOR_ID_SBB1] = &max77650_SBB1_desc;
 362                 rdescs[MAX77650_REGULATOR_ID_SBB2] = &max77650_SBB2_desc;
 363                 break;
 364         case MAX77650_CID_77651A:
 365         case MAX77650_CID_77651B:
 366                 rdescs[MAX77650_REGULATOR_ID_SBB1] = &max77651_SBB1_desc;
 367                 rdescs[MAX77650_REGULATOR_ID_SBB2] = &max77651_SBB2_desc;
 368                 break;
 369         default:
 370                 return -ENODEV;
 371         }
 372
 373         config.dev = parent;
 374
 375         for (i = 0; i < MAX77650_REGULATOR_NUM_REGULATORS; i++) {
 376                 rdesc = rdescs[i];
 377
 378                 rdev = devm_regulator_register(dev, &rdesc->desc, &config);
 379                 if (IS_ERR(rdev))
 380                         return PTR_ERR(rdev);
 381         }
 382
 383         return 0;
 384 }
 385
 386 static const struct of_device_id max77650_regulator_of_match[] = {
 387         { .compatible = "maxim,max77650-regulator" },
 388         { }
 389 };
 390 MODULE_DEVICE_TABLE(of, max77650_regulator_of_match);
 391
 392 static struct platform_driver max77650_regulator_driver = {
 393         .driver = {
 394                 .name = "max77650-regulator",
 395                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 396                 .of_match_table = max77650_regulator_of_match,
 397         },
 398         .probe = max77650_regulator_probe,
 399 };
 400 module_platform_driver(max77650_regulator_driver);
 401
 402 MODULE_DESCRIPTION("MAXIM 77650/77651 regulator driver");
 403 MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
 404 MODULE_LICENSE("GPL v2");
 405 MODULE_ALIAS("platform:max77650-regulator");