drivers/regulator/da9211-regulator.c

   1 /*
   2  * da9211-regulator.c - Regulator device driver for DA9211/DA9212
   3  * /DA9213/DA9214/DA9215
   4  * Copyright (C) 2015  Dialog Semiconductor Ltd.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Library General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Library General Public License for more details.
  15  */
  16
  17 #include <linux/err.h>
  18 #include <linux/gpio.h>
  19 #include <linux/i2c.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/slab.h>
  23 #include <linux/regulator/driver.h>
  24 #include <linux/regulator/machine.h>
  25 #include <linux/regmap.h>
  26 #include <linux/irq.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/of_gpio.h>
  29 #include <linux/regulator/of_regulator.h>
  30 #include <linux/regulator/da9211.h>
  31 #include "da9211-regulator.h"
  32
  33 /* DEVICE IDs */
  34 #define DA9211_DEVICE_ID        0x22
  35 #define DA9213_DEVICE_ID        0x23
  36 #define DA9215_DEVICE_ID        0x24
  37
  38 #define DA9211_BUCK_MODE_SLEEP  1
  39 #define DA9211_BUCK_MODE_SYNC   2
  40 #define DA9211_BUCK_MODE_AUTO   3
  41
  42 /* DA9211 REGULATOR IDs */
  43 #define DA9211_ID_BUCKA 0
  44 #define DA9211_ID_BUCKB 1
  45
  46 struct da9211 {
  47         struct device *dev;
  48         struct regmap *regmap;
  49         struct da9211_pdata *pdata;
  50         struct regulator_dev *rdev[DA9211_MAX_REGULATORS];
  51         int num_regulator;
  52         int chip_irq;
  53         int chip_id;
  54 };
  55
  56 static const struct regmap_range_cfg da9211_regmap_range[] = {
  57         {
  58                 .selector_reg = DA9211_REG_PAGE_CON,
  59                 .selector_mask  = DA9211_REG_PAGE_MASK,
  60                 .selector_shift = DA9211_REG_PAGE_SHIFT,
  61                 .window_start = 0,
  62                 .window_len = 256,
  63                 .range_min = 0,
  64                 .range_max = 5*128,
  65         },
  66 };
  67
  68 static const struct regmap_config da9211_regmap_config = {
  69         .reg_bits = 8,
  70         .val_bits = 8,
  71         .max_register = 5 * 128,
  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_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 }
 251
 252 static struct regulator_desc da9211_regulators[] = {
 253         DA9211_BUCK(BUCKA),
 254         DA9211_BUCK(BUCKB),
 255 };
 256
 257 #ifdef CONFIG_OF
 258 static struct of_regulator_match da9211_matches[] = {
 259         [DA9211_ID_BUCKA] = { .name = "BUCKA" },
 260         [DA9211_ID_BUCKB] = { .name = "BUCKB" },
 261         };
 262
 263 static struct da9211_pdata *da9211_parse_regulators_dt(
 264                 struct device *dev)
 265 {
 266         struct da9211_pdata *pdata;
 267         struct device_node *node;
 268         int i, num, n;
 269
 270         node = of_get_child_by_name(dev->of_node, "regulators");
 271         if (!node) {
 272                 dev_err(dev, "regulators node not found\n");
 273                 return ERR_PTR(-ENODEV);
 274         }
 275
 276         num = of_regulator_match(dev, node, da9211_matches,
 277                                  ARRAY_SIZE(da9211_matches));
 278         of_node_put(node);
 279         if (num < 0) {
 280                 dev_err(dev, "Failed to match regulators\n");
 281                 return ERR_PTR(-EINVAL);
 282         }
 283
 284         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 285         if (!pdata)
 286                 return ERR_PTR(-ENOMEM);
 287
 288         pdata->num_buck = num;
 289
 290         n = 0;
 291         for (i = 0; i < ARRAY_SIZE(da9211_matches); i++) {
 292                 if (!da9211_matches[i].init_data)
 293                         continue;
 294
 295                 pdata->init_data[n] = da9211_matches[i].init_data;
 296                 pdata->reg_node[n] = da9211_matches[i].of_node;
 297                 pdata->gpio_ren[n] =
 298                         of_get_named_gpio(da9211_matches[i].of_node,
 299                                 "enable-gpios", 0);
 300                 n++;
 301         }
 302
 303         return pdata;
 304 }
 305 #else
 306 static struct da9211_pdata *da9211_parse_regulators_dt(
 307                 struct device *dev)
 308 {
 309         return ERR_PTR(-ENODEV);
 310 }
 311 #endif
 312
 313 static irqreturn_t da9211_irq_handler(int irq, void *data)
 314 {
 315         struct da9211 *chip = data;
 316         int reg_val, err, ret = IRQ_NONE;
 317
 318         err = regmap_read(chip->regmap, DA9211_REG_EVENT_B, &reg_val);
 319         if (err < 0)
 320                 goto error_i2c;
 321
 322         if (reg_val & DA9211_E_OV_CURR_A) {
 323                 regulator_notifier_call_chain(chip->rdev[0],
 324                         REGULATOR_EVENT_OVER_CURRENT, NULL);
 325
 326                 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 327                         DA9211_E_OV_CURR_A);
 328                 if (err < 0)
 329                         goto error_i2c;
 330
 331                 ret = IRQ_HANDLED;
 332         }
 333
 334         if (reg_val & DA9211_E_OV_CURR_B) {
 335                 regulator_notifier_call_chain(chip->rdev[1],
 336                         REGULATOR_EVENT_OVER_CURRENT, NULL);
 337
 338                 err = regmap_write(chip->regmap, DA9211_REG_EVENT_B,
 339                         DA9211_E_OV_CURR_B);
 340                 if (err < 0)
 341                         goto error_i2c;
 342
 343                 ret = IRQ_HANDLED;
 344         }
 345
 346         return ret;
 347
 348 error_i2c:
 349         dev_err(chip->dev, "I2C error : %d\n", err);
 350         return IRQ_NONE;
 351 }
 352
 353 static int da9211_regulator_init(struct da9211 *chip)
 354 {
 355         struct regulator_config config = { };
 356         int i, ret;
 357         unsigned int data;
 358
 359         ret = regmap_read(chip->regmap, DA9211_REG_CONFIG_E, &data);
 360         if (ret < 0) {
 361                 dev_err(chip->dev, "Failed to read CONFIG_E reg: %d\n", ret);
 362                 return ret;
 363         }
 364
 365         data &= DA9211_SLAVE_SEL;
 366         /* If configuration for 1/2 bucks is different between platform data
 367          * and the register, driver should exit.
 368          */
 369         if (chip->pdata->num_buck == 1 && data == 0x00)
 370                 chip->num_regulator = 1;
 371         else if (chip->pdata->num_buck == 2 && data != 0x00)
 372                 chip->num_regulator = 2;
 373         else {
 374                 dev_err(chip->dev, "Configuration is mismatched\n");
 375                 return -EINVAL;
 376         }
 377
 378         for (i = 0; i < chip->num_regulator; i++) {
 379                 config.init_data = chip->pdata->init_data[i];
 380                 config.dev = chip->dev;
 381                 config.driver_data = chip;
 382                 config.regmap = chip->regmap;
 383                 config.of_node = chip->pdata->reg_node[i];
 384
 385                 if (gpio_is_valid(chip->pdata->gpio_ren[i])) {
 386                         config.ena_gpio = chip->pdata->gpio_ren[i];
 387                         config.ena_gpio_initialized = true;
 388                 } else {
 389                         config.ena_gpio = -EINVAL;
 390                         config.ena_gpio_initialized = false;
 391                 }
 392
 393                 chip->rdev[i] = devm_regulator_register(chip->dev,
 394                         &da9211_regulators[i], &config);
 395                 if (IS_ERR(chip->rdev[i])) {
 396                         dev_err(chip->dev,
 397                                 "Failed to register DA9211 regulator\n");
 398                         return PTR_ERR(chip->rdev[i]);
 399                 }
 400
 401                 if (chip->chip_irq != 0) {
 402                         ret = regmap_update_bits(chip->regmap,
 403                                 DA9211_REG_MASK_B, DA9211_M_OV_CURR_A << i, 0);
 404                         if (ret < 0) {
 405                                 dev_err(chip->dev,
 406                                         "Failed to update mask reg: %d\n", ret);
 407                                 return ret;
 408                         }
 409                 }
 410         }
 411
 412         return 0;
 413 }
 414
 415 /*
 416  * I2C driver interface functions
 417  */
 418 static int da9211_i2c_probe(struct i2c_client *i2c,
 419                 const struct i2c_device_id *id)
 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         {"da9214", DA9214},
 500         {"da9215", DA9215},
 501         {},
 502 };
 503 MODULE_DEVICE_TABLE(i2c, da9211_i2c_id);
 504
 505 #ifdef CONFIG_OF
 506 static const struct of_device_id da9211_dt_ids[] = {
 507         { .compatible = "dlg,da9211", .data = &da9211_i2c_id[0] },
 508         { .compatible = "dlg,da9212", .data = &da9211_i2c_id[1] },
 509         { .compatible = "dlg,da9213", .data = &da9211_i2c_id[2] },
 510         { .compatible = "dlg,da9214", .data = &da9211_i2c_id[3] },
 511         { .compatible = "dlg,da9215", .data = &da9211_i2c_id[4] },
 512         {},
 513 };
 514 MODULE_DEVICE_TABLE(of, da9211_dt_ids);
 515 #endif
 516
 517 static struct i2c_driver da9211_regulator_driver = {
 518         .driver = {
 519                 .name = "da9211",
 520                 .of_match_table = of_match_ptr(da9211_dt_ids),
 521         },
 522         .probe = da9211_i2c_probe,
 523         .id_table = da9211_i2c_id,
 524 };
 525
 526 module_i2c_driver(da9211_regulator_driver);
 527
 528 MODULE_AUTHOR("James Ban <James.Ban.opensource@diasemi.com>");
 529 MODULE_DESCRIPTION("DA9211/DA9212/DA9213/DA9214/DA9215 regulator driver");
 530 MODULE_LICENSE("GPL");