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/delay.h>
  23 #include <linux/uaccess.h>
  24 #include <linux/regulator/driver.h>
  25 #include <linux/regulator/machine.h>
  26 #include <linux/platform_data/lp8755.h>
  27
  28 #define LP8755_REG_BUCK0        0x00
  29 #define LP8755_REG_BUCK1        0x03
  30 #define LP8755_REG_BUCK2        0x04
  31 #define LP8755_REG_BUCK3        0x01
  32 #define LP8755_REG_BUCK4        0x05
  33 #define LP8755_REG_BUCK5        0x02
  34 #define LP8755_REG_MAX          0xFF
  35
  36 #define LP8755_BUCK_EN_M        BIT(7)
  37 #define LP8755_BUCK_LINEAR_OUT_MAX      0x76
  38 #define LP8755_BUCK_VOUT_M      0x7F
  39
  40 struct lp8755_mphase {
  41         int nreg;
  42         int buck_num[LP8755_BUCK_MAX];
  43 };
  44
  45 struct lp8755_chip {
  46         struct device *dev;
  47         struct regmap *regmap;
  48         struct lp8755_platform_data *pdata;
  49
  50         int irq;
  51         unsigned int irqmask;
  52
  53         int mphase;
  54         struct regulator_dev *rdev[LP8755_BUCK_MAX];
  55 };
  56
  57 /**
  58  *lp8755_read : read a single register value from lp8755.
  59  *@pchip : device to read from
  60  *@reg   : register to read from
  61  *@val   : pointer to store read value
  62  */
  63 static int lp8755_read(struct lp8755_chip *pchip, unsigned int reg,
  64                        unsigned int *val)
  65 {
  66         return regmap_read(pchip->regmap, reg, val);
  67 }
  68
  69 /**
  70  *lp8755_write : write a single register value to lp8755.
  71  *@pchip : device to write to
  72  *@reg   : register to write to
  73  *@val   : value to be written
  74  */
  75 static int lp8755_write(struct lp8755_chip *pchip, unsigned int reg,
  76                         unsigned int val)
  77 {
  78         return regmap_write(pchip->regmap, reg, val);
  79 }
  80
  81 /**
  82  *lp8755_update_bits : set the values of bit fields in lp8755 register.
  83  *@pchip : device to read from
  84  *@reg   : register to update
  85  *@mask  : bitmask to be changed
  86  *@val   : value for bitmask
  87  */
  88 static int lp8755_update_bits(struct lp8755_chip *pchip, unsigned int reg,
  89                               unsigned int mask, unsigned int val)
  90 {
  91         return regmap_update_bits(pchip->regmap, reg, mask, val);
  92 }
  93
  94 static int lp8755_buck_enable_time(struct regulator_dev *rdev)
  95 {
  96         int ret;
  97         unsigned int regval;
  98         enum lp8755_bucks id = rdev_get_id(rdev);
  99         struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
 100
 101         ret = lp8755_read(pchip, 0x12 + id, &regval);
 102         if (ret < 0) {
 103                 dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 104                 return ret;
 105         }
 106         return (regval & 0xff) * 100;
 107 }
 108
 109 static int lp8755_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
 110 {
 111         int ret;
 112         unsigned int regbval = 0x0;
 113         enum lp8755_bucks id = rdev_get_id(rdev);
 114         struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
 115
 116         switch (mode) {
 117         case REGULATOR_MODE_FAST:
 118                 /* forced pwm mode */
 119                 regbval = (0x01 << id);
 120                 break;
 121         case REGULATOR_MODE_NORMAL:
 122                 /* enable automatic pwm/pfm mode */
 123                 ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x00);
 124                 if (ret < 0)
 125                         goto err_i2c;
 126                 break;
 127         case REGULATOR_MODE_IDLE:
 128                 /* enable automatic pwm/pfm/lppfm mode */
 129                 ret = lp8755_update_bits(pchip, 0x08 + id, 0x20, 0x20);
 130                 if (ret < 0)
 131                         goto err_i2c;
 132
 133                 ret = lp8755_update_bits(pchip, 0x10, 0x01, 0x01);
 134                 if (ret < 0)
 135                         goto err_i2c;
 136                 break;
 137         default:
 138                 dev_err(pchip->dev, "Not supported buck mode %s\n", __func__);
 139                 /* forced pwm mode */
 140                 regbval = (0x01 << id);
 141         }
 142
 143         ret = lp8755_update_bits(pchip, 0x06, 0x01 << id, regbval);
 144         if (ret < 0)
 145                 goto err_i2c;
 146         return ret;
 147 err_i2c:
 148         dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 149         return ret;
 150 }
 151
 152 static unsigned int lp8755_buck_get_mode(struct regulator_dev *rdev)
 153 {
 154         int ret;
 155         unsigned int regval;
 156         enum lp8755_bucks id = rdev_get_id(rdev);
 157         struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
 158
 159         ret = lp8755_read(pchip, 0x06, &regval);
 160         if (ret < 0)
 161                 goto err_i2c;
 162
 163         /* mode fast means forced pwm mode */
 164         if (regval & (0x01 << id))
 165                 return REGULATOR_MODE_FAST;
 166
 167         ret = lp8755_read(pchip, 0x08 + id, &regval);
 168         if (ret < 0)
 169                 goto err_i2c;
 170
 171         /* mode idle means automatic pwm/pfm/lppfm mode */
 172         if (regval & 0x20)
 173                 return REGULATOR_MODE_IDLE;
 174
 175         /* mode normal means automatic pwm/pfm mode */
 176         return REGULATOR_MODE_NORMAL;
 177
 178 err_i2c:
 179         dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 180         return 0;
 181 }
 182
 183 static int lp8755_buck_set_ramp(struct regulator_dev *rdev, int ramp)
 184 {
 185         int ret;
 186         unsigned int regval = 0x00;
 187         enum lp8755_bucks id = rdev_get_id(rdev);
 188         struct lp8755_chip *pchip = rdev_get_drvdata(rdev);
 189
 190         /* uV/us */
 191         switch (ramp) {
 192         case 0 ... 230:
 193                 regval = 0x07;
 194                 break;
 195         case 231 ... 470:
 196                 regval = 0x06;
 197                 break;
 198         case 471 ... 940:
 199                 regval = 0x05;
 200                 break;
 201         case 941 ... 1900:
 202                 regval = 0x04;
 203                 break;
 204         case 1901 ... 3800:
 205                 regval = 0x03;
 206                 break;
 207         case 3801 ... 7500:
 208                 regval = 0x02;
 209                 break;
 210         case 7501 ... 15000:
 211                 regval = 0x01;
 212                 break;
 213         case 15001 ... 30000:
 214                 regval = 0x00;
 215                 break;
 216         default:
 217                 dev_err(pchip->dev,
 218                         "Not supported ramp value %d %s\n", ramp, __func__);
 219                 return -EINVAL;
 220         }
 221
 222         ret = lp8755_update_bits(pchip, 0x07 + id, 0x07, regval);
 223         if (ret < 0)
 224                 goto err_i2c;
 225         return ret;
 226 err_i2c:
 227         dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 228         return ret;
 229 }
 230
 231 static struct regulator_ops lp8755_buck_ops = {
 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 acceess 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 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                     regulator_register(&lp8755_regulators[buck_num], &rconfig);
 343                 if (IS_ERR(pchip->rdev[buck_num])) {
 344                         ret = PTR_ERR(pchip->rdev[buck_num]);
 345                         pchip->rdev[buck_num] = NULL;
 346                         dev_err(pchip->dev, "regulator init failed: buck %d\n",
 347                                 buck_num);
 348                         goto err_buck;
 349                 }
 350         }
 351
 352         return 0;
 353
 354 err_buck:
 355         for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 356                 regulator_unregister(pchip->rdev[icnt]);
 357         return ret;
 358 }
 359
 360 static irqreturn_t lp8755_irq_handler(int irq, void *data)
 361 {
 362         int ret, icnt;
 363         unsigned int flag0, flag1;
 364         struct lp8755_chip *pchip = data;
 365
 366         /* read flag0 register */
 367         ret = lp8755_read(pchip, 0x0D, &flag0);
 368         if (ret < 0)
 369                 goto err_i2c;
 370         /* clear flag register to pull up int. pin */
 371         ret = lp8755_write(pchip, 0x0D, 0x00);
 372         if (ret < 0)
 373                 goto err_i2c;
 374
 375         /* sent power fault detection event to specific regulator */
 376         for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 377                 if ((flag0 & (0x4 << icnt))
 378                     && (pchip->irqmask & (0x04 << icnt))
 379                     && (pchip->rdev[icnt] != NULL))
 380                         regulator_notifier_call_chain(pchip->rdev[icnt],
 381                                                       LP8755_EVENT_PWR_FAULT,
 382                                                       NULL);
 383
 384         /* read flag1 register */
 385         ret = lp8755_read(pchip, 0x0E, &flag1);
 386         if (ret < 0)
 387                 goto err_i2c;
 388         /* clear flag register to pull up int. pin */
 389         ret = lp8755_write(pchip, 0x0E, 0x00);
 390         if (ret < 0)
 391                 goto err_i2c;
 392
 393         /* send OCP event to all regualtor devices */
 394         if ((flag1 & 0x01) && (pchip->irqmask & 0x01))
 395                 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 396                         if (pchip->rdev[icnt] != NULL)
 397                                 regulator_notifier_call_chain(pchip->rdev[icnt],
 398                                                               LP8755_EVENT_OCP,
 399                                                               NULL);
 400
 401         /* send OVP event to all regualtor devices */
 402         if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
 403                 for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 404                         if (pchip->rdev[icnt] != NULL)
 405                                 regulator_notifier_call_chain(pchip->rdev[icnt],
 406                                                               LP8755_EVENT_OVP,
 407                                                               NULL);
 408         return IRQ_HANDLED;
 409
 410 err_i2c:
 411         dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 412         return IRQ_NONE;
 413 }
 414
 415 static int lp8755_int_config(struct lp8755_chip *pchip)
 416 {
 417         int ret;
 418         unsigned int regval;
 419
 420         if (pchip->irq == 0) {
 421                 dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
 422                 return 0;
 423         }
 424
 425         ret = lp8755_read(pchip, 0x0F, &regval);
 426         if (ret < 0)
 427                 goto err_i2c;
 428         pchip->irqmask = regval;
 429         ret = request_threaded_irq(pchip->irq, NULL, lp8755_irq_handler,
 430                                    IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 431                                    "lp8755-irq", pchip);
 432         if (ret)
 433                 return ret;
 434
 435         return ret;
 436
 437 err_i2c:
 438         dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 439         return ret;
 440 }
 441
 442 static const struct regmap_config lp8755_regmap = {
 443         .reg_bits = 8,
 444         .val_bits = 8,
 445         .max_register = LP8755_REG_MAX,
 446 };
 447
 448 static int lp8755_probe(struct i2c_client *client,
 449                         const struct i2c_device_id *id)
 450 {
 451         int ret, icnt;
 452         struct lp8755_chip *pchip;
 453         struct lp8755_platform_data *pdata = client->dev.platform_data;
 454
 455         if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 456                 dev_err(&client->dev, "i2c functionality check fail.\n");
 457                 return -EOPNOTSUPP;
 458         }
 459
 460         pchip = devm_kzalloc(&client->dev,
 461                              sizeof(struct lp8755_chip), GFP_KERNEL);
 462         if (!pchip)
 463                 return -ENOMEM;
 464
 465         pchip->dev = &client->dev;
 466         pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
 467         if (IS_ERR(pchip->regmap)) {
 468                 ret = PTR_ERR(pchip->regmap);
 469                 dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
 470                 return ret;
 471         }
 472         i2c_set_clientdata(client, pchip);
 473
 474         if (pdata != NULL) {
 475                 pchip->pdata = pdata;
 476                 pchip->mphase = pdata->mphase;
 477         } else {
 478                 pchip->pdata = devm_kzalloc(pchip->dev,
 479                                             sizeof(struct lp8755_platform_data),
 480                                             GFP_KERNEL);
 481                 if (!pchip->pdata)
 482                         return -ENOMEM;
 483                 ret = lp8755_init_data(pchip);
 484                 if (ret < 0) {
 485                         dev_err(&client->dev, "fail to initialize chip\n");
 486                         return ret;
 487                 }
 488         }
 489
 490         ret = lp8755_regulator_init(pchip);
 491         if (ret < 0) {
 492                 dev_err(&client->dev, "fail to initialize regulators\n");
 493                 goto err_regulator;
 494         }
 495
 496         pchip->irq = client->irq;
 497         ret = lp8755_int_config(pchip);
 498         if (ret < 0) {
 499                 dev_err(&client->dev, "fail to irq config\n");
 500                 goto err_irq;
 501         }
 502
 503         return ret;
 504
 505 err_irq:
 506         for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
 507                 regulator_unregister(pchip->rdev[icnt]);
 508
 509 err_regulator:
 510         /* output disable */
 511         for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 512                 lp8755_write(pchip, icnt, 0x00);
 513
 514         return ret;
 515 }
 516
 517 static int lp8755_remove(struct i2c_client *client)
 518 {
 519         int icnt;
 520         struct lp8755_chip *pchip = i2c_get_clientdata(client);
 521
 522         for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
 523                 regulator_unregister(pchip->rdev[icnt]);
 524
 525         for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 526                 lp8755_write(pchip, icnt, 0x00);
 527
 528         if (pchip->irq != 0)
 529                 free_irq(pchip->irq, pchip);
 530
 531         return 0;
 532 }
 533
 534 static const struct i2c_device_id lp8755_id[] = {
 535         {LP8755_NAME, 0},
 536         {}
 537 };
 538
 539 MODULE_DEVICE_TABLE(i2c, lp8755_id);
 540
 541 static struct i2c_driver lp8755_i2c_driver = {
 542         .driver = {
 543                    .name = LP8755_NAME,
 544                    },
 545         .probe = lp8755_probe,
 546         .remove = lp8755_remove,
 547         .id_table = lp8755_id,
 548 };
 549
 550 static int __init lp8755_init(void)
 551 {
 552         return i2c_add_driver(&lp8755_i2c_driver);
 553 }
 554
 555 subsys_initcall(lp8755_init);
 556
 557 static void __exit lp8755_exit(void)
 558 {
 559         i2c_del_driver(&lp8755_i2c_driver);
 560 }
 561
 562 module_exit(lp8755_exit);
 563
 564 MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
 565 MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
 566 MODULE_LICENSE("GPL v2");