drivers/regulator/da9211-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // da9211-regulator.c - Regulator device driver for DA9211/DA9212
   4 // /DA9213/DA9223/DA9214/DA9224/DA9215/DA9225
   5 // Copyright (C) 2015  Dialog Semiconductor Ltd.
   6
   7 #include <linux/err.h>
   8 #include <linux/i2c.h>
   9 #include <linux/module.h>
  10 #include <linux/init.h>
  11 #include <linux/slab.h>
  12 #include <linux/regulator/driver.h>
  13 #include <linux/regulator/machine.h>
  14 #include <linux/regmap.h>
  15 #include <linux/irq.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/gpio/consumer.h>
  18 #include <linux/regulator/of_regulator.h>
  19 #include <linux/regulator/da9211.h>
  20 #include <dt-bindings/regulator/dlg,da9211-regulator.h>
  21 #include "da9211-regulator.h"
  22
  23 /* DEVICE IDs */
  24 #define DA9211_DEVICE_ID        0x22
  25 #define DA9213_DEVICE_ID        0x23
  26 #define DA9215_DEVICE_ID        0x24
  27
  28 /* DA9211 REGULATOR IDs */
  29 #define DA9211_ID_BUCKA 0
  30 #define DA9211_ID_BUCKB 1
  31
  32 struct da9211 {
  33         struct device *dev;
  34         struct regmap *regmap;
  35         struct da9211_pdata *pdata;
  36         struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
  37         int num_regulator;
  38         int chip_irq;
  39         int chip_id;
  40 };
  41
  42 static const struct regmap_range_cfg da9211_regmap_range[] = {
  43         {
  44                 .selector_reg = DA9211_REG_PAGE_CON,
  45                 .selector_mask  = DA9211_REG_PAGE_MASK,
  46                 .selector_shift = DA9211_REG_PAGE_SHIFT,
  47                 .window_start = 0,
  48                 .window_len = 256,
  49                 .range_min = 0,
  50                 .range_max = 5*128,
  51         },
  52 };
  53
  54 static bool da9211_volatile_reg(struct device *dev, unsigned int reg)
  55 {
  56         switch (reg) {
  57         case DA9211_REG_STATUS_A:
  58         case DA9211_REG_STATUS_B:
  59         case DA9211_REG_EVENT_A:
  60         case DA9211_REG_EVENT_B:
  61                 return true;
  62         }
  63         return false;
  64 }
  65
  66 static const struct regmap_config da9211_regmap_config = {
  67         .reg_bits = 8,
  68         .val_bits = 8,
  69         .max_register = 5 * 128,
  70         .volatile_reg = da9211_volatile_reg,
  71         .cache_type = REGCACHE_RBTREE,
  72         .ranges = da9211_regmap_range,
  73         .num_ranges = ARRAY_SIZE(da9211_regmap_range),
  74 };
  75
  76 /* Default limits measured in millivolts and milliamps */
  77 #define DA9211_MIN_MV           300
  78 #define DA9211_MAX_MV           1570
  79 #define DA9211_STEP_MV          10
  80
  81 /* Current limits for DA9211 buck (uA) indices
  82  * corresponds with register values
  83  */
  84 static const int da9211_current_limits[] = {
  85         2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
  86         3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
  87 };
  88 /* Current limits for DA9213 buck (uA) indices
  89  * corresponds with register values
  90  */
  91 static const int da9213_current_limits[] = {
  92         3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
  93         4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
  94 };
  95 /* Current limits for DA9215 buck (uA) indices
  96  * corresponds with register values
  97  */
  98 static const int da9215_current_limits[] = {
  99         4000000, 4200000, 4400000, 4600000, 4800000, 5000000, 5200000, 5400000,
 100         5600000, 5800000, 6000000, 6200000, 6400000, 6600000, 6800000, 7000000
 101 };
 102
 103 static unsigned int da9211_map_buck_mode(unsigned int mode)
 104 {
 105         switch (mode) {
 106         case DA9211_BUCK_MODE_SLEEP:
 107                 return REGULATOR_MODE_STANDBY;
 108         case DA9211_BUCK_MODE_SYNC:
 109                 return REGULATOR_MODE_FAST;
 110         case DA9211_BUCK_MODE_AUTO:
 111                 return REGULATOR_MODE_NORMAL;
 112         default:
 113                 return REGULATOR_MODE_INVALID;
 114         }
 115 }
 116
 117 static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
 118 {
 119         int id = rdev_get_id(rdev);
 120         struct da9211 *chip = rdev_get_drvdata(rdev);
 121         unsigned int data;
 122         int ret, mode = 0;
 123
 124         ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
 125         if (ret < 0)
 126                 return ret;
 127
 128         switch (data & 0x03) {
 129         case DA9211_BUCK_MODE_SYNC:
 130                 mode = REGULATOR_MODE_FAST;
 131                 break;
 132         case DA9211_BUCK_MODE_AUTO:
 133                 mode = REGULATOR_MODE_NORMAL;
 134                 break;
 135         case DA9211_BUCK_MODE_SLEEP:
 136                 mode = REGULATOR_MODE_STANDBY;
 137                 break;
 138         }
 139
 140         return mode;
 141 }
 142
 143 static int da9211_buck_set_mode(struct regulator_dev *rdev,
 144                                         unsigned int mode)
 145 {
 146         int id = rdev_get_id(rdev);
 147         struct da9211 *chip = rdev_get_drvdata(rdev);
 148         int val = 0;
 149
 150         switch (mode) {
 151         case REGULATOR_MODE_FAST:
 152                 val = DA9211_BUCK_MODE_SYNC;
 153                 break;
 154         case REGULATOR_MODE_NORMAL:
 155                 val = DA9211_BUCK_MODE_AUTO;
 156                 break;
 157         case REGULATOR_MODE_STANDBY:
 158                 val = DA9211_BUCK_MODE_SLEEP;
 159                 break;
 160         }
 161
 162         return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
 163                                         0x03, val);
 164 }
 165
 166 static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
 167                                     int max)
 168 {
 169         int id = rdev_get_id(rdev);
 170         struct da9211 *chip = rdev_get_drvdata(rdev);
 171         int i, max_size;
 172         const int *current_limits;
 173
 174         switch (chip->chip_id) {
 175         case DA9211:
 176                 current_limits = da9211_current_limits;
 177                 max_size = ARRAY_SIZE(da9211_current_limits)-1;
 178                 break;
 179         case DA9213:
 180                 current_limits = da9213_current_limits;
 181                 max_size = ARRAY_SIZE(da9213_current_limits)-1;
 182                 break;
 183         case DA9215:
 184                 current_limits = da9215_current_limits;
 185                 max_size = ARRAY_SIZE(da9215_current_limits)-1;
 186                 break;
 187         default:
 188                 return -EINVAL;
 189         }
 190
 191         /* search for closest to maximum */
 192         for (i = max_size; i >= 0; i--) {
 193                 if (min <= current_limits[i] &&
 194                     max >= current_limits[i]) {
 195                                 return regmap_update_bits(chip->regmap,
 196                                         DA9211_REG_BUCK_ILIM,
 197                                         (0x0F << id*4), (i << id*4));
 198                 }
 199         }
 200
 201         return -EINVAL;
 202 }
 203
 204 static int da9211_get_current_limit(struct regulator_dev *rdev)
 205 {
 206         int id = rdev_get_id(rdev);
 207         struct da9211 *chip = rdev_get_drvdata(rdev);
 208         unsigned int data;
 209         int ret;
 210         const int *current_limits;
 211
 212         switch (chip->chip_id) {
 213         case DA9211:
 214                 current_limits = da9211_current_limits;
 215                 break;
 216         case DA9213:
 217                 current_limits = da9213_current_limits;
 218                 break;
 219         case DA9215:
 220                 current_limits = da9215_current_limits;
 221                 break;
 222         default:
 223                 return -EINVAL;
 224         }
 225
 226         ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
 227         if (ret < 0)
 228                 return ret;
 229
 230         /* select one of 16 values: 0000 (2000mA or 3000mA)
 231          * to 1111 (5000mA or 6000mA).
 232          */
 233         data = (data >> id*4) & 0x0F;
 234         return current_limits[data];
 235 }
 236
 237 static const struct regulator_ops da9211_buck_ops = {
 238         .get_mode = da9211_buck_get_mode,
 239         .set_mode = da9211_buck_set_mode,
 240         .enable = regulator_enable_regmap,
 241         .disable = regulator_disable_regmap,
 242         .is_enabled = regulator_is_enabled_regmap,
 243         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 244         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 245         .list_voltage = regulator_list_voltage_linear,
 246         .set_current_limit = da9211_set_current_limit,
 247         .get_current_limit = da9211_get_current_limit,
 248 };
 249
 250 #define DA9211_BUCK(_id) \
 251 {\
 252         .name = #_id,\
 253         .ops = &da9211_buck_ops,\
 254         .type = REGULATOR_VOLTAGE,\
 255         .id = DA9211_ID_##_id,\
 256         .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
 257         .min_uV = (DA9211_MIN_MV * 1000),\
 258         .uV_step = (DA9211_STEP_MV * 1000),\
 259         .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
 260         .enable_mask = DA9211_BUCKA_EN,\
 261         .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
 262         .vsel_mask = DA9211_VBUCK_MASK,\
 263         .owner = THIS_MODULE,\
 264         .of_map_mode = da9211_map_buck_mode,\
 265 }
 266
 267 static struct regulator_desc da9211_regulators[] = {
 268         DA9211_BUCK(BUCKA),
 269         DA9211_BUCK(BUCKB),
 270 };
 271
 272 #ifdef CONFIG_OF
 273 static struct of_regulator_match da9211_matches[] = {
 274         [DA9211_ID_BUCKA] = {
 275                 .name = "BUCKA",
 276                 .desc = &da9211_regulators[DA9211_ID_BUCKA],
 277         },
 278         [DA9211_ID_BUCKB] = {
 279                 .name = "BUCKB",
 280                 .desc = &da9211_regulators[DA9211_ID_BUCKB],
 281         },
 282         };
 283
 284 static struct da9211_pdata *da9211_parse_regulators_dt(
 285                 struct device *dev)
 286 {
 287         struct da9211_pdata *pdata;
 288         struct device_node *node;
 289         int i, num, n;
 290
 291         node = of_get_child_by_name(dev->of_node, "regulators");
 292         if (!node) {
 293                 dev_err(dev, "regulators node not found\n");
 294                 return ERR_PTR(-ENODEV);
 295         }
 296
 297         num = of_regulator_match(dev, node, da9211_matches,
 298                                  ARRAY_SIZE(da9211_matches));
 299         of_node_put(node);
 300         if (num < 0) {
 301                 dev_err(dev, "Failed to match regulators\n");
 302                 return ERR_PTR(-EINVAL);
 303         }
 304
 305         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 306         if (!pdata)
 307                 return ERR_PTR(-ENOMEM);
 308
 309         pdata->num_buck = num;
 310
 311         n = 0;
 312         for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
 313                 if (!da9211_matches[i].init_data)
 314                         continue;
 315
 316                 pdata->init_data[n] = da9211_matches[i].init_data;
 317                 pdata->reg_node[n] = da9211_matches[i].of_node;
 318                 pdata->gpiod_ren[n] = devm_fwnode_gpiod_get(dev,
 319                                         of_fwnode_handle(pdata->reg_node[n]),
 320                                         "enable",
 321                                         GPIOD_OUT_HIGH |
 322                                                 GPIOD_FLAGS_BIT_NONEXCLUSIVE,
 323                                         "da9211-enable");
 324                 if (IS_ERR(pdata->gpiod_ren[n]))
 325                         pdata->gpiod_ren[n] = NULL;
 326                 n++;
 327         }
 328
 329         return pdata;
 330 }
 331 #else
 332 static struct da9211_pdata *da9211_parse_regulators_dt(
 333                 struct device *dev)
 334 {
 335         return ERR_PTR(-ENODEV);
 336 }
 337 #endif
 338
 339 static irqreturn_t da9211_irq_handler(int irq, void *data)
 340 {
 341         struct da9211 *chip = data;
 342         int reg_val, err, ret = IRQ_NONE;
 343
 344         err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
 345         if (err < 0)
 346                 goto error_i2c;
 347
 348         if (reg_val & DA9211_E_OV_CURR_A) {
 349                 regulator_notifier_call_chain(chip->rdev[0],
 350                         REGULATOR_EVENT_OVER_CURRENT, NULL);
 351
 352                 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 353                         DA9211_E_OV_CURR_A);
 354                 if (err < 0)
 355                         goto error_i2c;
 356
 357                 ret = IRQ_HANDLED;
 358         }
 359
 360         if (reg_val & DA9211_E_OV_CURR_B) {
 361                 regulator_notifier_call_chain(chip->rdev[1],
 362                         REGULATOR_EVENT_OVER_CURRENT, NULL);
 363
 364                 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 365                         DA9211_E_OV_CURR_B);
 366                 if (err < 0)
 367                         goto error_i2c;
 368
 369                 ret = IRQ_HANDLED;
 370         }
 371
 372         return ret;
 373
 374 error_i2c:
 375         dev_err(chip->dev, "I2C error : %d\n", err);
 376         return IRQ_NONE;
 377 }
 378
 379 static int da9211_regulator_init(struct da9211 *chip)
 380 {
 381         struct regulator_config config = { };
 382         int i, ret;
 383         unsigned int data;
 384
 385         ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
 386         if (ret < 0) {
 387                 dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
 388                 return ret;
 389         }
 390
 391         data &= DA9211_SLAVE_SEL;
 392         /* If configuration for 1/2 bucks is different between platform data
 393          * and the register, driver should exit.
 394          */
 395         if (chip->pdata->num_buck == 1 && data == 0x00)
 396                 chip->num_regulator = 1;
 397         else if (chip->pdata->num_buck == 2 && data != 0x00)
 398                 chip->num_regulator = 2;
 399         else {
 400                 dev_err(chip->dev, "Configuration is mismatched\n");
 401                 return -EINVAL;
 402         }
 403
 404         for (i = 0; i < chip->num_regulator; i++) {
 405                 config.init_data = chip->pdata->init_data[i];
 406                 config.dev = chip->dev;
 407                 config.driver_data = chip;
 408                 config.regmap = chip->regmap;
 409                 config.of_node = chip->pdata->reg_node[i];
 410
 411                 if (chip->pdata->gpiod_ren[i])
 412                         config.ena_gpiod = chip->pdata->gpiod_ren[i];
 413                 else
 414                         config.ena_gpiod = NULL;
 415
 416                 /*
 417                  * Hand the GPIO descriptor management over to the regulator
 418                  * core, remove it from GPIO devres management.
 419                  */
 420                 if (config.ena_gpiod)
 421                         devm_gpiod_unhinge(chip->dev, config.ena_gpiod);
 422                 chip->rdev[i] = devm_regulator_register(chip->dev,
 423                         &da9211_regulators[i], &config);
 424                 if (IS_ERR(chip->rdev[i])) {
 425                         dev_err(chip->dev,
 426                                 "Failed to register DA9211 regulator\n");
 427                         return PTR_ERR(chip->rdev[i]);
 428                 }
 429
 430                 if (chip->chip_irq != 0) {
 431                         ret = regmap_update_bits(chip->regmap,
 432                                 DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
 433                         if (ret < 0) {
 434                                 dev_err(chip->dev,
 435                                         "Failed to update mask reg: %d\n", ret);
 436                                 return ret;
 437                         }
 438                 }
 439         }
 440
 441         return 0;
 442 }
 443
 444 /*
 445  * I2C driver interface functions
 446  */
 447 static int da9211_i2c_probe(struct i2c_client *i2c)
 448 {
 449         struct da9211 *chip;
 450         int error, ret;
 451         unsigned int data;
 452
 453         chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
 454         if (!chip)
 455                 return -ENOMEM;
 456
 457         chip->dev = &i2c->dev;
 458         chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
 459         if (IS_ERR(chip->regmap)) {
 460                 error = PTR_ERR(chip->regmap);
 461                 dev_err(chip->dev, "Failed to allocate register map: %d\n",
 462                         error);
 463                 return error;
 464         }
 465
 466         i2c_set_clientdata(i2c, chip);
 467
 468         chip->pdata = i2c->dev.platform_data;
 469
 470         ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
 471         if (ret < 0) {
 472                 dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
 473                 return ret;
 474         }
 475
 476         switch (data) {
 477         case DA9211_DEVICE_ID:
 478                 chip->chip_id = DA9211;
 479                 break;
 480         case DA9213_DEVICE_ID:
 481                 chip->chip_id = DA9213;
 482                 break;
 483         case DA9215_DEVICE_ID:
 484                 chip->chip_id = DA9215;
 485                 break;
 486         default:
 487                 dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
 488                 return -ENODEV;
 489         }
 490
 491         if (!chip->pdata)
 492                 chip->pdata = da9211_parse_regulators_dt(chip->dev);
 493
 494         if (IS_ERR(chip->pdata)) {
 495                 dev_err(chip->dev, "No regulators defined for the platform\n");
 496                 return PTR_ERR(chip->pdata);
 497         }
 498
 499         chip->chip_irq = i2c->irq;
 500
 501         ret = da9211_regulator_init(chip);
 502         if (ret < 0) {
 503                 dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
 504                 return ret;
 505         }
 506
 507         if (chip->chip_irq != 0) {
 508                 ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
 509                                         da9211_irq_handler,
 510                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 511                                         "da9211", chip);
 512                 if (ret != 0) {
 513                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 514                                 chip->chip_irq);
 515                         return ret;
 516                 }
 517         } else {
 518                 dev_warn(chip->dev, "No IRQ configured\n");
 519         }
 520
 521         return ret;
 522 }
 523
 524 static const struct i2c_device_id da9211_i2c_id[] = {
 525         {"da9211", DA9211},
 526         {"da9212", DA9212},
 527         {"da9213", DA9213},
 528         {"da9223", DA9223},
 529         {"da9214", DA9214},
 530         {"da9224", DA9224},
 531         {"da9215", DA9215},
 532         {"da9225", DA9225},
 533         {},
 534 };
 535 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
 536
 537 #ifdef CONFIG_OF
 538 static const struct of_device_id da9211_dt_ids[] = {
 539         { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
 540         { .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
 541         { .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
 542         { .compatible = "dlg,da9223", .data = &da9211_i2c_id[3] },
 543         { .compatible = "dlg,da9214", .data = &da9211_i2c_id[4] },
 544         { .compatible = "dlg,da9224", .data = &da9211_i2c_id[5] },
 545         { .compatible = "dlg,da9215", .data = &da9211_i2c_id[6] },
 546         { .compatible = "dlg,da9225", .data = &da9211_i2c_id[7] },
 547         {},
 548 };
 549 MODULE_DEVICE_TABLE(of, da9211_dt_ids);
 550 #endif
 551
 552 static struct i2c_driver da9211_regulator_driver = {
 553         .driver = {
 554                 .name = "da9211",
 555                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 556                 .of_match_table = of_match_ptr(da9211_dt_ids),
 557         },
 558         .probe = da9211_i2c_probe,
 559         .id_table = da9211_i2c_id,
 560 };
 561
 562 module_i2c_driver(da9211_regulator_driver);
 563
 564 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 565 MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9223/DA9214/DA9224/DA9215/DA9225 regulator driver");
 566 MODULE_LICENSE("GPL");