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