drivers/regulator/lp8755.c

   1 /*
   2  * LP8755 High Performance Power Management Unit : System Interface Driver
   3  * (based on rev. 0.26)
   4  * Copyright 2012 Texas Instruments
   5  *
   6  * Author: Daniel(Geon Si) Jeong <daniel.jeong@ti.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/slab.h>
  16 #include <linux/i2c.h>
  17 #include <linux/err.h>
  18 #include <linux/irq.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/gpio.h>
  21 #include <linux/regmap.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/regulator/driver.h>
  24 #include <linux/regulator/machine.h>
  25 #include <linux/platform_data/lp8755.h>
  26
  27 #define LP8755_REG_BUCK0        0x00
  28 #define LP8755_REG_BUCK1        0x03
  29 #define LP8755_REG_BUCK2        0x04
  30 #define LP8755_REG_BUCK3        0x01
  31 #define LP8755_REG_BUCK4        0x05
  32 #define LP8755_REG_BUCK5        0x02
  33 #define LP8755_REG_MAX          0xFF
  34
  35 #define LP8755_BUCK_EN_M        BIT(7)
  36 #define LP8755_BUCK_LINEAR_OUT_MAX      0x76
  37 #define LP8755_BUCK_VOUT_M      0x7F
  38
  39 struct lp8755_mphase {
  40         int nreg;
  41         int buck_num[LP8755_BUCK_MAX];
  42 };
  43
  44 struct lp8755_chip {
  45         struct device *dev;
  46         struct regmap *regmap;
  47         struct lp8755_platform_data *pdata;
  48
  49         int irq;
  50         unsigned int irqmask;
  51
  52         int mphase;
  53         struct regulator_dev *rdev[LP8755_BUCK_MAX];
  54 };
  55
  56 /**
  57  *lp8755_read : read a single register value from lp8755.
  58  *@pchip : device to read from
  59  *@reg   : register to read from
  60  *@val   : pointer to store read value
  61  */
  62 static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
  63                        unsigned int *val)
  64 {
  65         return regmap_read(pchip->regmap, reg, val);
  66 }
  67
  68 /**
  69  *lp8755_write : write a single register value to lp8755.
  70  *@pchip : device to write to
  71  *@reg   : register to write to
  72  *@val   : value to be written
  73  */
  74 static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
  75                         unsigned int val)
  76 {
  77         return regmap_write(pchip->regmap, reg, val);
  78 }
  79
  80 /**
  81  *lp8755_update_bits : set the values of bit fields in lp8755 register.
  82  *@pchip : device to read from
  83  *@reg   : register to update
  84  *@mask  : bitmask to be changed
  85  *@val   : value for bitmask
  86  */
  87 static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
  88                               unsigned int mask, unsigned int val)
  89 {
  90         return regmap_update_bits(pchip->regmap, reg, mask, val);
  91 }
  92
  93 static int lp8755_buck_enable_time(struct regulator_dev *rdev)
  94 {
  95         int ret;
  96         unsigned int regval;
  97         enum lp8755_bucks id = rdev_get_id(rdev);
  98         struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
  99
 100         ret = lp8755_read(pchip, 0x12 + id, &regval);
 101         if (ret < 0) {
 102                 dev_err(pchip->dev, "i2c access error %s\n", __func__);
 103                 return ret;
 104         }
 105         return (regval & 0xff) * 100;
 106 }
 107
 108 static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
 109 {
 110         int ret;
 111         unsigned int regbval = 0x0;
 112         enum lp8755_bucks id = rdev_get_id(rdev);
 113         struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
 114
 115         switch (mode) {
 116         case REGULATOR_MODE_FAST:
 117                 /* forced pwm mode */
 118                 regbval = (0x01 << id);
 119                 break;
 120         case REGULATOR_MODE_NORMAL:
 121                 /* enable automatic pwm/pfm mode */
 122                 ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
 123                 if (ret < 0)
 124                         goto err_i2c;
 125                 break;
 126         case REGULATOR_MODE_IDLE:
 127                 /* enable automatic pwm/pfm/lppfm mode */
 128                 ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
 129                 if (ret < 0)
 130                         goto err_i2c;
 131
 132                 ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
 133                 if (ret < 0)
 134                         goto err_i2c;
 135                 break;
 136         default:
 137                 dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
 138                 /* forced pwm mode */
 139                 regbval = (0x01 << id);
 140         }
 141
 142         ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
 143         if (ret < 0)
 144                 goto err_i2c;
 145         return ret;
 146 err_i2c:
 147         dev_err(pchip->dev, "i2c access error %s\n", __func__);
 148         return ret;
 149 }
 150
 151 static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
 152 {
 153         int ret;
 154         unsigned int regval;
 155         enum lp8755_bucks id = rdev_get_id(rdev);
 156         struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
 157
 158         ret = lp8755_read(pchip, 0x06, &regval);
 159         if (ret < 0)
 160                 goto err_i2c;
 161
 162         /* mode fast means forced pwm mode */
 163         if (regval & (0x01 << id))
 164                 return REGULATOR_MODE_FAST;
 165
 166         ret = lp8755_read(pchip, 0x08 + id, &regval);
 167         if (ret < 0)
 168                 goto err_i2c;
 169
 170         /* mode idle means automatic pwm/pfm/lppfm mode */
 171         if (regval & 0x20)
 172                 return REGULATOR_MODE_IDLE;
 173
 174         /* mode normal means automatic pwm/pfm mode */
 175         return REGULATOR_MODE_NORMAL;
 176
 177 err_i2c:
 178         dev_err(pchip->dev, "i2c access error %s\n", __func__);
 179         return 0;
 180 }
 181
 182 static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
 183 {
 184         int ret;
 185         unsigned int regval = 0x00;
 186         enum lp8755_bucks id = rdev_get_id(rdev);
 187         struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
 188
 189         /* uV/us */
 190         switch (ramp) {
 191         case 0 ... 230:
 192                 regval = 0x07;
 193                 break;
 194         case 231 ... 470:
 195                 regval = 0x06;
 196                 break;
 197         case 471 ... 940:
 198                 regval = 0x05;
 199                 break;
 200         case 941 ... 1900:
 201                 regval = 0x04;
 202                 break;
 203         case 1901 ... 3800:
 204                 regval = 0x03;
 205                 break;
 206         case 3801 ... 7500:
 207                 regval = 0x02;
 208                 break;
 209         case 7501 ... 15000:
 210                 regval = 0x01;
 211                 break;
 212         case 15001 ... 30000:
 213                 regval = 0x00;
 214                 break;
 215         default:
 216                 dev_err(pchip->dev,
 217                         "Not supported ramp value %d %s\n", ramp, __func__);
 218                 return -EINVAL;
 219         }
 220
 221         ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
 222         if (ret < 0)
 223                 goto err_i2c;
 224         return ret;
 225 err_i2c:
 226         dev_err(pchip->dev, "i2c access error %s\n", __func__);
 227         return ret;
 228 }
 229
 230 static const struct regulator_ops lp8755_buck_ops = {
 231         .map_voltage = regulator_map_voltage_linear,
 232         .list_voltage = regulator_list_voltage_linear,
 233         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 234         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 235         .enable = regulator_enable_regmap,
 236         .disable = regulator_disable_regmap,
 237         .is_enabled = regulator_is_enabled_regmap,
 238         .enable_time = lp8755_buck_enable_time,
 239         .set_mode = lp8755_buck_set_mode,
 240         .get_mode = lp8755_buck_get_mode,
 241         .set_ramp_delay = lp8755_buck_set_ramp,
 242 };
 243
 244 #define lp8755_rail(_id) "lp8755_buck"#_id
 245 #define lp8755_buck_init(_id)\
 246 {\
 247         .constraints = {\
 248                 .name = lp8755_rail(_id),\
 249                 .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
 250                 .min_uV = 500000,\
 251                 .max_uV = 1675000,\
 252         },\
 253 }
 254
 255 static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
 256         [LP8755_BUCK0] = lp8755_buck_init(0),
 257         [LP8755_BUCK1] = lp8755_buck_init(1),
 258         [LP8755_BUCK2] = lp8755_buck_init(2),
 259         [LP8755_BUCK3] = lp8755_buck_init(3),
 260         [LP8755_BUCK4] = lp8755_buck_init(4),
 261         [LP8755_BUCK5] = lp8755_buck_init(5),
 262 };
 263
 264 static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
 265         { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
 266         { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
 267                LP8755_BUCK4, LP8755_BUCK5 } },
 268         { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
 269                LP8755_BUCK5} },
 270         { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
 271         { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
 272         { 2, { LP8755_BUCK0, LP8755_BUCK5} },
 273         { 1, { LP8755_BUCK0} },
 274         { 2, { LP8755_BUCK0, LP8755_BUCK3} },
 275         { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
 276 };
 277
 278 static int lp8755_init_data(struct lp8755_chip *pchip)
 279 {
 280         unsigned int regval;
 281         int ret, icnt, buck_num;
 282         struct lp8755_platform_data *pdata = pchip->pdata;
 283
 284         /* read back  muti-phase configuration */
 285         ret = lp8755_read(pchip, 0x3D, &regval);
 286         if (ret < 0)
 287                 goto out_i2c_error;
 288         pchip->mphase = regval & 0x0F;
 289
 290         /* set default data based on multi-phase config */
 291         for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
 292                 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
 293                 pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
 294         }
 295         return ret;
 296
 297 out_i2c_error:
 298         dev_err(pchip->dev, "i2c access error %s\n", __func__);
 299         return ret;
 300 }
 301
 302 #define lp8755_buck_desc(_id)\
 303 {\
 304         .name = lp8755_rail(_id),\
 305         .id   = LP8755_BUCK##_id,\
 306         .ops  = &lp8755_buck_ops,\
 307         .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
 308         .uV_step = 10000,\
 309         .min_uV = 500000,\
 310         .type = REGULATOR_VOLTAGE,\
 311         .owner = THIS_MODULE,\
 312         .enable_reg = LP8755_REG_BUCK##_id,\
 313         .enable_mask = LP8755_BUCK_EN_M,\
 314         .vsel_reg = LP8755_REG_BUCK##_id,\
 315         .vsel_mask = LP8755_BUCK_VOUT_M,\
 316 }
 317
 318 static const struct regulator_desc lp8755_regulators[] = {
 319         lp8755_buck_desc(0),
 320         lp8755_buck_desc(1),
 321         lp8755_buck_desc(2),
 322         lp8755_buck_desc(3),
 323         lp8755_buck_desc(4),
 324         lp8755_buck_desc(5),
 325 };
 326
 327 static int lp8755_regulator_init(struct lp8755_chip *pchip)
 328 {
 329         int ret, icnt, buck_num;
 330         struct lp8755_platform_data *pdata = pchip->pdata;
 331         struct regulator_config rconfig = { };
 332
 333         rconfig.regmap = pchip->regmap;
 334         rconfig.dev = pchip->dev;
 335         rconfig.driver_data = pchip;
 336
 337         for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
 338                 buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
 339                 rconfig.init_data = pdata->buck_data[buck_num];
 340                 rconfig.of_node = pchip->dev->of_node;
 341                 pchip->rdev[buck_num] =
 342                     devm_regulator_register(pchip->dev,
 343                                     &lp8755_regulators[buck_num], &rconfig);
 344                 if (IS_ERR(pchip->rdev[buck_num])) {
 345                         ret = PTR_ERR(pchip->rdev[buck_num]);
 346                         pchip->rdev[buck_num] = NULL;
 347                         dev_err(pchip->dev, "regulator init failed: buck %d\n",
 348                                 buck_num);
 349                         return ret;
 350                 }
 351         }
 352
 353         return 0;
 354 }
 355
 356 static irqreturn_t lp8755_irq_handler(int irq, void *data)
 357 {
 358         int ret, icnt;
 359         unsigned int flag0, flag1;
 360         struct lp8755_chip *pchip = data;
 361
 362         /* read flag0 register */
 363         ret = lp8755_read(pchip, 0x0D, &flag0);
 364         if (ret < 0)
 365                 goto err_i2c;
 366         /* clear flag register to pull up int. pin */
 367         ret = lp8755_write(pchip, 0x0D, 0x00);
 368         if (ret < 0)
 369                 goto err_i2c;
 370
 371         /* sent power fault detection event to specific regulator */
 372         for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 373                 if ((flag0 & (0x4 << icnt))
 374                     && (pchip->irqmask & (0x04 << icnt))
 375                     && (pchip->rdev[icnt] != NULL)) {
 376                         regulator_lock(pchip->rdev[icnt]);
 377                         regulator_notifier_call_chain(pchip->rdev[icnt],
 378                                                       LP8755_EVENT_PWR_FAULT,
 379                                                       NULL);
 380                         regulator_unlock(pchip->rdev[icnt]);
 381                 }
 382
 383         /* read flag1 register */
 384         ret = lp8755_read(pchip, 0x0E, &flag1);
 385         if (ret < 0)
 386                 goto err_i2c;
 387         /* clear flag register to pull up int. pin */
 388         ret = lp8755_write(pchip, 0x0E, 0x00);
 389         if (ret < 0)
 390                 goto err_i2c;
 391
 392         /* send OCP event to all regulator devices */
 393         if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
 394                 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 395                         if (pchip->rdev[icnt] != NULL) {
 396                                 regulator_lock(pchip->rdev[icnt]);
 397                                 regulator_notifier_call_chain(pchip->rdev[icnt],
 398                                                               LP8755_EVENT_OCP,
 399                                                               NULL);
 400                                 regulator_unlock(pchip->rdev[icnt]);
 401                         }
 402
 403         /* send OVP event to all regulator devices */
 404         if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
 405                 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 406                         if (pchip->rdev[icnt] != NULL) {
 407                                 regulator_lock(pchip->rdev[icnt]);
 408                                 regulator_notifier_call_chain(pchip->rdev[icnt],
 409                                                               LP8755_EVENT_OVP,
 410                                                               NULL);
 411                                 regulator_unlock(pchip->rdev[icnt]);
 412                         }
 413         return IRQ_HANDLED;
 414
 415 err_i2c:
 416         dev_err(pchip->dev, "i2c access error %s\n", __func__);
 417         return IRQ_NONE;
 418 }
 419
 420 static int lp8755_int_config(struct lp8755_chip *pchip)
 421 {
 422         int ret;
 423         unsigned int regval;
 424
 425         if (pchip->irq == 0) {
 426                 dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
 427                 return 0;
 428         }
 429
 430         ret = lp8755_read(pchip, 0x0F, &regval);
 431         if (ret < 0) {
 432                 dev_err(pchip->dev, "i2c access error %s\n", __func__);
 433                 return ret;
 434         }
 435
 436         pchip->irqmask = regval;
 437         return devm_request_threaded_irq(pchip->dev, pchip->irq, NULL,
 438                                          lp8755_irq_handler,
 439                                          IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 440                                          "lp8755-irq", pchip);
 441 }
 442
 443 static const struct regmap_config lp8755_regmap = {
 444         .reg_bits = 8,
 445         .val_bits = 8,
 446         .max_register = LP8755_REG_MAX,
 447 };
 448
 449 static int lp8755_probe(struct i2c_client *client,
 450                         const struct i2c_device_id *id)
 451 {
 452         int ret, icnt;
 453         struct lp8755_chip *pchip;
 454         struct lp8755_platform_data *pdata = dev_get_platdata(&client->dev);
 455
 456         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 457                 dev_err(&client->dev, "i2c functionality check fail.\n");
 458                 return -EOPNOTSUPP;
 459         }
 460
 461         pchip = devm_kzalloc(&client->dev,
 462                              sizeof(struct lp8755_chip), GFP_KERNEL);
 463         if (!pchip)
 464                 return -ENOMEM;
 465
 466         pchip->dev = &client->dev;
 467         pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
 468         if (IS_ERR(pchip->regmap)) {
 469                 ret = PTR_ERR(pchip->regmap);
 470                 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
 471                 return ret;
 472         }
 473         i2c_set_clientdata(client, pchip);
 474
 475         if (pdata != NULL) {
 476                 pchip->pdata = pdata;
 477                 pchip->mphase = pdata->mphase;
 478         } else {
 479                 pchip->pdata = devm_kzalloc(pchip->dev,
 480                                             sizeof(struct lp8755_platform_data),
 481                                             GFP_KERNEL);
 482                 if (!pchip->pdata)
 483                         return -ENOMEM;
 484                 ret = lp8755_init_data(pchip);
 485                 if (ret < 0) {
 486                         dev_err(&client->dev, "fail to initialize chip\n");
 487                         return ret;
 488                 }
 489         }
 490
 491         ret = lp8755_regulator_init(pchip);
 492         if (ret < 0) {
 493                 dev_err(&client->dev, "fail to initialize regulators\n");
 494                 goto err;
 495         }
 496
 497         pchip->irq = client->irq;
 498         ret = lp8755_int_config(pchip);
 499         if (ret < 0) {
 500                 dev_err(&client->dev, "fail to irq config\n");
 501                 goto err;
 502         }
 503
 504         return ret;
 505
 506 err:
 507         /* output disable */
 508         for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 509                 lp8755_write(pchip, icnt, 0x00);
 510
 511         return ret;
 512 }
 513
 514 static int lp8755_remove(struct i2c_client *client)
 515 {
 516         int icnt;
 517         struct lp8755_chip *pchip = i2c_get_clientdata(client);
 518
 519         for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 520                 lp8755_write(pchip, icnt, 0x00);
 521
 522         return 0;
 523 }
 524
 525 static const struct i2c_device_id lp8755_id[] = {
 526         {LP8755_NAME, 0},
 527         {}
 528 };
 529
 530 MODULE_DEVICE_TABLE(i2c, lp8755_id);
 531
 532 static struct i2c_driver lp8755_i2c_driver = {
 533         .driver = {
 534                    .name = LP8755_NAME,
 535                    },
 536         .probe = lp8755_probe,
 537         .remove = lp8755_remove,
 538         .id_table = lp8755_id,
 539 };
 540
 541 static int __init lp8755_init(void)
 542 {
 543         return i2c_add_driver(&lp8755_i2c_driver);
 544 }
 545
 546 subsys_initcall(lp8755_init);
 547
 548 static void __exit lp8755_exit(void)
 549 {
 550         i2c_del_driver(&lp8755_i2c_driver);
 551 }
 552
 553 module_exit(lp8755_exit);
 554
 555 MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
 556 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
 557 MODULE_LICENSE("GPL v2");