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