drivers/regulator/da9211-regulator.c

   1 /*
   2  * da9211-regulator.c - Regulator device driver for DA9211/DA9213
   3  * Copyright (C) 2014  Dialog Semiconductor Ltd.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Library General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Library General Public License for more details.
  14  */
  15
  16 #include <linux/err.h>
  17 #include <linux/gpio.h>
  18 #include <linux/i2c.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/slab.h>
  22 #include <linux/regulator/driver.h>
  23 #include <linux/regulator/machine.h>
  24 #include <linux/regmap.h>
  25 #include <linux/irq.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/of_gpio.h>
  28 #include <linux/regulator/of_regulator.h>
  29 #include <linux/regulator/da9211.h>
  30 #include "da9211-regulator.h"
  31
  32 /* DEVICE IDs */
  33 #define DA9211_DEVICE_ID        0x22
  34 #define DA9213_DEVICE_ID        0x23
  35
  36 #define DA9211_BUCK_MODE_SLEEP  1
  37 #define DA9211_BUCK_MODE_SYNC   2
  38 #define DA9211_BUCK_MODE_AUTO   3
  39
  40 /* DA9211 REGULATOR IDs */
  41 #define DA9211_ID_BUCKA 0
  42 #define DA9211_ID_BUCKB 1
  43
  44 struct da9211 {
  45         struct device *dev;
  46         struct regmap *regmap;
  47         struct da9211_pdata *pdata;
  48         struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
  49         int num_regulator;
  50         int chip_irq;
  51         int chip_id;
  52 };
  53
  54 static const struct regmap_range_cfg da9211_regmap_range[] = {
  55         {
  56                 .selector_reg = DA9211_REG_PAGE_CON,
  57                 .selector_mask  = DA9211_REG_PAGE_MASK,
  58                 .selector_shift = DA9211_REG_PAGE_SHIFT,
  59                 .window_start = 0,
  60                 .window_len = 256,
  61                 .range_min = 0,
  62                 .range_max = 5*128,
  63         },
  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         .ranges = da9211_regmap_range,
  71         .num_ranges = ARRAY_SIZE(da9211_regmap_range),
  72 };
  73
  74 /* Default limits measured in millivolts and milliamps */
  75 #define DA9211_MIN_MV           300
  76 #define DA9211_MAX_MV           1570
  77 #define DA9211_STEP_MV          10
  78
  79 /* Current limits for DA9211 buck (uA) indices
  80  * corresponds with register values
  81  */
  82 static const int da9211_current_limits[] = {
  83         2000000, 2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000,
  84         3600000, 3800000, 4000000, 4200000, 4400000, 4600000, 4800000, 5000000
  85 };
  86 /* Current limits for DA9213 buck (uA) indices
  87  * corresponds with register values
  88  */
  89 static const int da9213_current_limits[] = {
  90         3000000, 3200000, 3400000, 3600000, 3800000, 4000000, 4200000, 4400000,
  91         4600000, 4800000, 5000000, 5200000, 5400000, 5600000, 5800000, 6000000
  92 };
  93
  94 static unsigned int da9211_buck_get_mode(struct regulator_dev *rdev)
  95 {
  96         int id = rdev_get_id(rdev);
  97         struct da9211 *chip = rdev_get_drvdata(rdev);
  98         unsigned int data;
  99         int ret, mode = 0;
 100
 101         ret = regmap_read(chip->regmap, DA9211_REG_BUCKA_CONF+id, &data);
 102         if (ret < 0)
 103                 return ret;
 104
 105         switch (data & 0x03) {
 106         case DA9211_BUCK_MODE_SYNC:
 107                 mode = REGULATOR_MODE_FAST;
 108                 break;
 109         case DA9211_BUCK_MODE_AUTO:
 110                 mode = REGULATOR_MODE_NORMAL;
 111                 break;
 112         case DA9211_BUCK_MODE_SLEEP:
 113                 mode = REGULATOR_MODE_STANDBY;
 114                 break;
 115         }
 116
 117         return mode;
 118 }
 119
 120 static int da9211_buck_set_mode(struct regulator_dev *rdev,
 121                                         unsigned int mode)
 122 {
 123         int id = rdev_get_id(rdev);
 124         struct da9211 *chip = rdev_get_drvdata(rdev);
 125         int val = 0;
 126
 127         switch (mode) {
 128         case REGULATOR_MODE_FAST:
 129                 val = DA9211_BUCK_MODE_SYNC;
 130                 break;
 131         case REGULATOR_MODE_NORMAL:
 132                 val = DA9211_BUCK_MODE_AUTO;
 133                 break;
 134         case REGULATOR_MODE_STANDBY:
 135                 val = DA9211_BUCK_MODE_SLEEP;
 136                 break;
 137         }
 138
 139         return regmap_update_bits(chip->regmap, DA9211_REG_BUCKA_CONF+id,
 140                                         0x03, val);
 141 }
 142
 143 static int da9211_set_current_limit(struct regulator_dev *rdev, int min,
 144                                     int max)
 145 {
 146         int id = rdev_get_id(rdev);
 147         struct da9211 *chip = rdev_get_drvdata(rdev);
 148         int i, max_size;
 149         const int *current_limits;
 150
 151         switch (chip->chip_id) {
 152         case DA9211:
 153                 current_limits = da9211_current_limits;
 154                 max_size = ARRAY_SIZE(da9211_current_limits)-1;
 155                 break;
 156         case DA9213:
 157                 current_limits = da9213_current_limits;
 158                 max_size = ARRAY_SIZE(da9213_current_limits)-1;
 159                 break;
 160         default:
 161                 return -EINVAL;
 162         }
 163
 164         /* search for closest to maximum */
 165         for (i = max_size; i >= 0; i--) {
 166                 if (min <= current_limits[i] &&
 167                     max >= current_limits[i]) {
 168                                 return regmap_update_bits(chip->regmap,
 169                                         DA9211_REG_BUCK_ILIM,
 170                                         (0x0F << id*4), (i << id*4));
 171                 }
 172         }
 173
 174         return -EINVAL;
 175 }
 176
 177 static int da9211_get_current_limit(struct regulator_dev *rdev)
 178 {
 179         int id = rdev_get_id(rdev);
 180         struct da9211 *chip = rdev_get_drvdata(rdev);
 181         unsigned int data;
 182         int ret;
 183         const int *current_limits;
 184
 185         switch (chip->chip_id) {
 186         case DA9211:
 187                 current_limits = da9211_current_limits;
 188                 break;
 189         case DA9213:
 190                 current_limits = da9213_current_limits;
 191                 break;
 192         default:
 193                 return -EINVAL;
 194         }
 195
 196         ret = regmap_read(chip->regmap, DA9211_REG_BUCK_ILIM, &data);
 197         if (ret < 0)
 198                 return ret;
 199
 200         /* select one of 16 values: 0000 (2000mA or 3000mA)
 201          * to 1111 (5000mA or 6000mA).
 202          */
 203         data = (data >> id*4) & 0x0F;
 204         return current_limits[data];
 205 }
 206
 207 static struct regulator_ops da9211_buck_ops = {
 208         .get_mode = da9211_buck_get_mode,
 209         .set_mode = da9211_buck_set_mode,
 210         .enable = regulator_enable_regmap,
 211         .disable = regulator_disable_regmap,
 212         .is_enabled = regulator_is_enabled_regmap,
 213         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 214         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 215         .list_voltage = regulator_list_voltage_linear,
 216         .set_current_limit = da9211_set_current_limit,
 217         .get_current_limit = da9211_get_current_limit,
 218 };
 219
 220 #define DA9211_BUCK(_id) \
 221 {\
 222         .name = #_id,\
 223         .ops = &da9211_buck_ops,\
 224         .type = REGULATOR_VOLTAGE,\
 225         .id = DA9211_ID_##_id,\
 226         .n_voltages = (DA9211_MAX_MV - DA9211_MIN_MV) / DA9211_STEP_MV + 1,\
 227         .min_uV = (DA9211_MIN_MV * 1000),\
 228         .uV_step = (DA9211_STEP_MV * 1000),\
 229         .enable_reg = DA9211_REG_BUCKA_CONT + DA9211_ID_##_id,\
 230         .enable_mask = DA9211_BUCKA_EN,\
 231         .vsel_reg = DA9211_REG_VBUCKA_A + DA9211_ID_##_id * 2,\
 232         .vsel_mask = DA9211_VBUCK_MASK,\
 233         .owner = THIS_MODULE,\
 234 }
 235
 236 static struct regulator_desc da9211_regulators[] = {
 237         DA9211_BUCK(BUCKA),
 238         DA9211_BUCK(BUCKB),
 239 };
 240
 241 #ifdef CONFIG_OF
 242 static struct of_regulator_match da9211_matches[] = {
 243         [DA9211_ID_BUCKA] = { .name = "BUCKA" },
 244         [DA9211_ID_BUCKB] = { .name = "BUCKB" },
 245         };
 246
 247 static struct da9211_pdata *da9211_parse_regulators_dt(
 248                 struct device *dev)
 249 {
 250         struct da9211_pdata *pdata;
 251         struct device_node *node;
 252         int i, num, n;
 253
 254         node = of_get_child_by_name(dev->of_node, "regulators");
 255         if (!node) {
 256                 dev_err(dev, "regulators node not found\n");
 257                 return ERR_PTR(-ENODEV);
 258         }
 259
 260         num = of_regulator_match(dev, node, da9211_matches,
 261                                  ARRAY_SIZE(da9211_matches));
 262         of_node_put(node);
 263         if (num < 0) {
 264                 dev_err(dev, "Failed to match regulators\n");
 265                 return ERR_PTR(-EINVAL);
 266         }
 267
 268         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 269         if (!pdata)
 270                 return ERR_PTR(-ENOMEM);
 271
 272         pdata->num_buck = num;
 273
 274         n = 0;
 275         for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
 276                 if (!da9211_matches[i].init_data)
 277                         continue;
 278
 279                 pdata->init_data[n] = da9211_matches[i].init_data;
 280                 pdata->reg_node[n] = da9211_matches[i].of_node;
 281                 pdata->gpio_ren[n] =
 282                         of_get_named_gpio(da9211_matches[i].of_node,
 283                                 "enable-gpios", 0);
 284                 n++;
 285         }
 286
 287         return pdata;
 288 }
 289 #else
 290 static struct da9211_pdata *da9211_parse_regulators_dt(
 291                 struct device *dev)
 292 {
 293         return ERR_PTR(-ENODEV);
 294 }
 295 #endif
 296
 297 static irqreturn_t da9211_irq_handler(int irq, void *data)
 298 {
 299         struct da9211 *chip = data;
 300         int reg_val, err, ret = IRQ_NONE;
 301
 302         err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
 303         if (err < 0)
 304                 goto error_i2c;
 305
 306         if (reg_val & DA9211_E_OV_CURR_A) {
 307                 regulator_notifier_call_chain(chip->rdev[0],
 308                         REGULATOR_EVENT_OVER_CURRENT, NULL);
 309
 310                 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 311                         DA9211_E_OV_CURR_A);
 312                 if (err < 0)
 313                         goto error_i2c;
 314
 315                 ret = IRQ_HANDLED;
 316         }
 317
 318         if (reg_val & DA9211_E_OV_CURR_B) {
 319                 regulator_notifier_call_chain(chip->rdev[1],
 320                         REGULATOR_EVENT_OVER_CURRENT, NULL);
 321
 322                 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 323                         DA9211_E_OV_CURR_B);
 324                 if (err < 0)
 325                         goto error_i2c;
 326
 327                 ret = IRQ_HANDLED;
 328         }
 329
 330         return ret;
 331
 332 error_i2c:
 333         dev_err(chip->dev, "I2C error : %d\n", err);
 334         return IRQ_NONE;
 335 }
 336
 337 static int da9211_regulator_init(struct da9211 *chip)
 338 {
 339         struct regulator_config config = { };
 340         int i, ret;
 341         unsigned int data;
 342
 343         ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
 344         if (ret < 0) {
 345                 dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
 346                 return ret;
 347         }
 348
 349         data &= DA9211_SLAVE_SEL;
 350         /* If configuration for 1/2 bucks is different between platform data
 351          * and the register, driver should exit.
 352          */
 353         if ((chip->pdata->num_buck == 2 && data == 0x40)
 354                 || (chip->pdata->num_buck == 1 && data == 0x00)) {
 355                 if (data == 0)
 356                         chip->num_regulator = 1;
 357                 else
 358                         chip->num_regulator = 2;
 359         } else {
 360                 dev_err(chip->dev, "Configuration is mismatched\n");
 361                 return -EINVAL;
 362         }
 363
 364         for (i = 0; i < chip->num_regulator; i++) {
 365                 config.init_data = chip->pdata->init_data[i];
 366                 config.dev = chip->dev;
 367                 config.driver_data = chip;
 368                 config.regmap = chip->regmap;
 369                 config.of_node = chip->pdata->reg_node[i];
 370
 371                 if (gpio_is_valid(chip->pdata->gpio_ren[i])) {
 372                         config.ena_gpio = chip->pdata->gpio_ren[i];
 373                         config.ena_gpio_initialized = true;
 374                 } else {
 375                         config.ena_gpio = -EINVAL;
 376                         config.ena_gpio_initialized = false;
 377                 }
 378
 379                 chip->rdev[i] = devm_regulator_register(chip->dev,
 380                         &da9211_regulators[i], &config);
 381                 if (IS_ERR(chip->rdev[i])) {
 382                         dev_err(chip->dev,
 383                                 "Failed to register DA9211 regulator\n");
 384                         return PTR_ERR(chip->rdev[i]);
 385                 }
 386
 387                 if (chip->chip_irq != 0) {
 388                         ret = regmap_update_bits(chip->regmap,
 389                                 DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
 390                         if (ret < 0) {
 391                                 dev_err(chip->dev,
 392                                         "Failed to update mask reg: %d\n", ret);
 393                                 return ret;
 394                         }
 395                 }
 396         }
 397
 398         return 0;
 399 }
 400
 401 /*
 402  * I2C driver interface functions
 403  */
 404 static int da9211_i2c_probe(struct i2c_client *i2c,
 405                 const struct i2c_device_id *id)
 406 {
 407         struct da9211 *chip;
 408         int error, ret;
 409         unsigned int data;
 410
 411         chip = devm_kzalloc(&i2c->dev, sizeof(struct da9211), GFP_KERNEL);
 412         if (!chip)
 413                 return -ENOMEM;
 414
 415         chip->dev = &i2c->dev;
 416         chip->regmap = devm_regmap_init_i2c(i2c, &da9211_regmap_config);
 417         if (IS_ERR(chip->regmap)) {
 418                 error = PTR_ERR(chip->regmap);
 419                 dev_err(chip->dev, "Failed to allocate register map: %d\n",
 420                         error);
 421                 return error;
 422         }
 423
 424         i2c_set_clientdata(i2c, chip);
 425
 426         chip->pdata = i2c->dev.platform_data;
 427
 428         ret = regmap_read(chip->regmap, DA9211_REG_DEVICE_ID, &data);
 429         if (ret < 0) {
 430                 dev_err(chip->dev, "Failed to read DEVICE_ID reg: %d\n", ret);
 431                 return ret;
 432         }
 433
 434         switch (data) {
 435         case DA9211_DEVICE_ID:
 436                 chip->chip_id = DA9211;
 437                 break;
 438         case DA9213_DEVICE_ID:
 439                 chip->chip_id = DA9213;
 440                 break;
 441         default:
 442                 dev_err(chip->dev, "Unsupported device id = 0x%x.\n", data);
 443                 return -ENODEV;
 444         }
 445
 446         if (!chip->pdata)
 447                 chip->pdata = da9211_parse_regulators_dt(chip->dev);
 448
 449         if (IS_ERR(chip->pdata)) {
 450                 dev_err(chip->dev, "No regulators defined for the platform\n");
 451                 return PTR_ERR(chip->pdata);
 452         }
 453
 454         chip->chip_irq = i2c->irq;
 455
 456         if (chip->chip_irq != 0) {
 457                 ret = devm_request_threaded_irq(chip->dev, chip->chip_irq, NULL,
 458                                         da9211_irq_handler,
 459                                         IRQF_TRIGGER_LOW|IRQF_ONESHOT,
 460                                         "da9211", chip);
 461                 if (ret != 0) {
 462                         dev_err(chip->dev, "Failed to request IRQ: %d\n",
 463                                 chip->chip_irq);
 464                         return ret;
 465                 }
 466         } else {
 467                 dev_warn(chip->dev, "No IRQ configured\n");
 468         }
 469
 470         ret = da9211_regulator_init(chip);
 471
 472         if (ret < 0)
 473                 dev_err(chip->dev, "Failed to initialize regulator: %d\n", ret);
 474
 475         return ret;
 476 }
 477
 478 static const struct i2c_device_id da9211_i2c_id[] = {
 479         {"da9211", DA9211},
 480         {"da9213", DA9213},
 481         {},
 482 };
 483 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
 484
 485 #ifdef CONFIG_OF
 486 static const struct of_device_id da9211_dt_ids[] = {
 487         { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
 488         { .compatible = "dlg,da9213", .data = &da9211_i2c_id[1] },
 489         {},
 490 };
 491 MODULE_DEVICE_TABLE(of, da9211_dt_ids);
 492 #endif
 493
 494 static struct i2c_driver da9211_regulator_driver = {
 495         .driver = {
 496                 .name = "da9211",
 497                 .owner = THIS_MODULE,
 498                 .of_match_table = of_match_ptr(da9211_dt_ids),
 499         },
 500         .probe = da9211_i2c_probe,
 501         .id_table = da9211_i2c_id,
 502 };
 503
 504 module_i2c_driver(da9211_regulator_driver);
 505
 506 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 507 MODULE_DESCRIPTION("Regulator device driver for Dialog DA9211/DA9213");
 508 MODULE_LICENSE("GPL v2");