drivers/regulator/da9211-regulator.c

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