linux/drivers/regulator/lp8755.c
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   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
  39struct lp8755_mphase {
  40        int nreg;
  41        int buck_num[LP8755_BUCK_MAX];
  42};
  43
  44struct 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 */
  62static 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 */
  74static 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 */
  87static 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
  93static 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 acceess error %s\n", __func__);
 103                return ret;
 104        }
 105        return (regval & 0xff) * 100;
 106}
 107
 108static 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;
 146err_i2c:
 147        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 148        return ret;
 149}
 150
 151static 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
 177err_i2c:
 178        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 179        return 0;
 180}
 181
 182static 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;
 225err_i2c:
 226        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 227        return ret;
 228}
 229
 230static struct regulator_ops lp8755_buck_ops = {
 231        .list_voltage = regulator_list_voltage_linear,
 232        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 233        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 234        .enable = regulator_enable_regmap,
 235        .disable = regulator_disable_regmap,
 236        .is_enabled = regulator_is_enabled_regmap,
 237        .enable_time = lp8755_buck_enable_time,
 238        .set_mode = lp8755_buck_set_mode,
 239        .get_mode = lp8755_buck_get_mode,
 240        .set_ramp_delay = lp8755_buck_set_ramp,
 241};
 242
 243#define lp8755_rail(_id) "lp8755_buck"#_id
 244#define lp8755_buck_init(_id)\
 245{\
 246        .constraints = {\
 247                .name = lp8755_rail(_id),\
 248                .valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,\
 249                .min_uV = 500000,\
 250                .max_uV = 1675000,\
 251        },\
 252}
 253
 254static struct regulator_init_data lp8755_reg_default[LP8755_BUCK_MAX] = {
 255        [LP8755_BUCK0] = lp8755_buck_init(0),
 256        [LP8755_BUCK1] = lp8755_buck_init(1),
 257        [LP8755_BUCK2] = lp8755_buck_init(2),
 258        [LP8755_BUCK3] = lp8755_buck_init(3),
 259        [LP8755_BUCK4] = lp8755_buck_init(4),
 260        [LP8755_BUCK5] = lp8755_buck_init(5),
 261};
 262
 263static const struct lp8755_mphase mphase_buck[MPHASE_CONF_MAX] = {
 264        { 3, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK5 } },
 265        { 6, { LP8755_BUCK0, LP8755_BUCK1, LP8755_BUCK2, LP8755_BUCK3,
 266               LP8755_BUCK4, LP8755_BUCK5 } },
 267        { 5, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK4,
 268               LP8755_BUCK5} },
 269        { 4, { LP8755_BUCK0, LP8755_BUCK3, LP8755_BUCK4, LP8755_BUCK5} },
 270        { 3, { LP8755_BUCK0, LP8755_BUCK4, LP8755_BUCK5} },
 271        { 2, { LP8755_BUCK0, LP8755_BUCK5} },
 272        { 1, { LP8755_BUCK0} },
 273        { 2, { LP8755_BUCK0, LP8755_BUCK3} },
 274        { 4, { LP8755_BUCK0, LP8755_BUCK2, LP8755_BUCK3, LP8755_BUCK5} },
 275};
 276
 277static int lp8755_init_data(struct lp8755_chip *pchip)
 278{
 279        unsigned int regval;
 280        int ret, icnt, buck_num;
 281        struct lp8755_platform_data *pdata = pchip->pdata;
 282
 283        /* read back  muti-phase configuration */
 284        ret = lp8755_read(pchip, 0x3D, &regval);
 285        if (ret < 0)
 286                goto out_i2c_error;
 287        pchip->mphase = regval & 0x0F;
 288
 289        /* set default data based on multi-phase config */
 290        for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
 291                buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
 292                pdata->buck_data[buck_num] = &lp8755_reg_default[buck_num];
 293        }
 294        return ret;
 295
 296out_i2c_error:
 297        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 298        return ret;
 299}
 300
 301#define lp8755_buck_desc(_id)\
 302{\
 303        .name = lp8755_rail(_id),\
 304        .id   = LP8755_BUCK##_id,\
 305        .ops  = &lp8755_buck_ops,\
 306        .n_voltages = LP8755_BUCK_LINEAR_OUT_MAX+1,\
 307        .uV_step = 10000,\
 308        .min_uV = 500000,\
 309        .type = REGULATOR_VOLTAGE,\
 310        .owner = THIS_MODULE,\
 311        .enable_reg = LP8755_REG_BUCK##_id,\
 312        .enable_mask = LP8755_BUCK_EN_M,\
 313        .vsel_reg = LP8755_REG_BUCK##_id,\
 314        .vsel_mask = LP8755_BUCK_VOUT_M,\
 315}
 316
 317static struct regulator_desc lp8755_regulators[] = {
 318        lp8755_buck_desc(0),
 319        lp8755_buck_desc(1),
 320        lp8755_buck_desc(2),
 321        lp8755_buck_desc(3),
 322        lp8755_buck_desc(4),
 323        lp8755_buck_desc(5),
 324};
 325
 326static int lp8755_regulator_init(struct lp8755_chip *pchip)
 327{
 328        int ret, icnt, buck_num;
 329        struct lp8755_platform_data *pdata = pchip->pdata;
 330        struct regulator_config rconfig = { };
 331
 332        rconfig.regmap = pchip->regmap;
 333        rconfig.dev = pchip->dev;
 334        rconfig.driver_data = pchip;
 335
 336        for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++) {
 337                buck_num = mphase_buck[pchip->mphase].buck_num[icnt];
 338                rconfig.init_data = pdata->buck_data[buck_num];
 339                rconfig.of_node = pchip->dev->of_node;
 340                pchip->rdev[buck_num] =
 341                    regulator_register(&lp8755_regulators[buck_num], &rconfig);
 342                if (IS_ERR(pchip->rdev[buck_num])) {
 343                        ret = PTR_ERR(pchip->rdev[buck_num]);
 344                        pchip->rdev[buck_num] = NULL;
 345                        dev_err(pchip->dev, "regulator init failed: buck %d\n",
 346                                buck_num);
 347                        goto err_buck;
 348                }
 349        }
 350
 351        return 0;
 352
 353err_buck:
 354        for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 355                regulator_unregister(pchip->rdev[icnt]);
 356        return ret;
 357}
 358
 359static irqreturn_t lp8755_irq_handler(int irq, void *data)
 360{
 361        int ret, icnt;
 362        unsigned int flag0, flag1;
 363        struct lp8755_chip *pchip = data;
 364
 365        /* read flag0 register */
 366        ret = lp8755_read(pchip, 0x0D, &flag0);
 367        if (ret < 0)
 368                goto err_i2c;
 369        /* clear flag register to pull up int. pin */
 370        ret = lp8755_write(pchip, 0x0D, 0x00);
 371        if (ret < 0)
 372                goto err_i2c;
 373
 374        /* sent power fault detection event to specific regulator */
 375        for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 376                if ((flag0 & (0x4 << icnt))
 377                    && (pchip->irqmask & (0x04 << icnt))
 378                    && (pchip->rdev[icnt] != NULL))
 379                        regulator_notifier_call_chain(pchip->rdev[icnt],
 380                                                      LP8755_EVENT_PWR_FAULT,
 381                                                      NULL);
 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 regualtor 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_notifier_call_chain(pchip->rdev[icnt],
 397                                                              LP8755_EVENT_OCP,
 398                                                              NULL);
 399
 400        /* send OVP event to all regualtor devices */
 401        if ((flag1 & 0x02) && (pchip->irqmask & 0x02))
 402                for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 403                        if (pchip->rdev[icnt] != NULL)
 404                                regulator_notifier_call_chain(pchip->rdev[icnt],
 405                                                              LP8755_EVENT_OVP,
 406                                                              NULL);
 407        return IRQ_HANDLED;
 408
 409err_i2c:
 410        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 411        return IRQ_NONE;
 412}
 413
 414static int lp8755_int_config(struct lp8755_chip *pchip)
 415{
 416        int ret;
 417        unsigned int regval;
 418
 419        if (pchip->irq == 0) {
 420                dev_warn(pchip->dev, "not use interrupt : %s\n", __func__);
 421                return 0;
 422        }
 423
 424        ret = lp8755_read(pchip, 0x0F, &regval);
 425        if (ret < 0)
 426                goto err_i2c;
 427        pchip->irqmask = regval;
 428        ret = request_threaded_irq(pchip->irq, NULL, lp8755_irq_handler,
 429                                   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 430                                   "lp8755-irq", pchip);
 431        if (ret)
 432                return ret;
 433
 434        return ret;
 435
 436err_i2c:
 437        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 438        return ret;
 439}
 440
 441static const struct regmap_config lp8755_regmap = {
 442        .reg_bits = 8,
 443        .val_bits = 8,
 444        .max_register = LP8755_REG_MAX,
 445};
 446
 447static int lp8755_probe(struct i2c_client *client,
 448                        const struct i2c_device_id *id)
 449{
 450        int ret, icnt;
 451        struct lp8755_chip *pchip;
 452        struct lp8755_platform_data *pdata = client->dev.platform_data;
 453
 454        if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 455                dev_err(&client->dev, "i2c functionality check fail.\n");
 456                return -EOPNOTSUPP;
 457        }
 458
 459        pchip = devm_kzalloc(&client->dev,
 460                             sizeof(struct lp8755_chip), GFP_KERNEL);
 461        if (!pchip)
 462                return -ENOMEM;
 463
 464        pchip->dev = &client->dev;
 465        pchip->regmap = devm_regmap_init_i2c(client, &lp8755_regmap);
 466        if (IS_ERR(pchip->regmap)) {
 467                ret = PTR_ERR(pchip->regmap);
 468                dev_err(&client->dev, "fail to allocate regmap %d\n", ret);
 469                return ret;
 470        }
 471        i2c_set_clientdata(client, pchip);
 472
 473        if (pdata != NULL) {
 474                pchip->pdata = pdata;
 475                pchip->mphase = pdata->mphase;
 476        } else {
 477                pchip->pdata = devm_kzalloc(pchip->dev,
 478                                            sizeof(struct lp8755_platform_data),
 479                                            GFP_KERNEL);
 480                if (!pchip->pdata)
 481                        return -ENOMEM;
 482                ret = lp8755_init_data(pchip);
 483                if (ret < 0) {
 484                        dev_err(&client->dev, "fail to initialize chip\n");
 485                        return ret;
 486                }
 487        }
 488
 489        ret = lp8755_regulator_init(pchip);
 490        if (ret < 0) {
 491                dev_err(&client->dev, "fail to initialize regulators\n");
 492                goto err_regulator;
 493        }
 494
 495        pchip->irq = client->irq;
 496        ret = lp8755_int_config(pchip);
 497        if (ret < 0) {
 498                dev_err(&client->dev, "fail to irq config\n");
 499                goto err_irq;
 500        }
 501
 502        return ret;
 503
 504err_irq:
 505        for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
 506                regulator_unregister(pchip->rdev[icnt]);
 507
 508err_regulator:
 509        /* output disable */
 510        for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 511                lp8755_write(pchip, icnt, 0x00);
 512
 513        return ret;
 514}
 515
 516static int lp8755_remove(struct i2c_client *client)
 517{
 518        int icnt;
 519        struct lp8755_chip *pchip = i2c_get_clientdata(client);
 520
 521        for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
 522                regulator_unregister(pchip->rdev[icnt]);
 523
 524        for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 525                lp8755_write(pchip, icnt, 0x00);
 526
 527        if (pchip->irq != 0)
 528                free_irq(pchip->irq, pchip);
 529
 530        return 0;
 531}
 532
 533static const struct i2c_device_id lp8755_id[] = {
 534        {LP8755_NAME, 0},
 535        {}
 536};
 537
 538MODULE_DEVICE_TABLE(i2c, lp8755_id);
 539
 540static struct i2c_driver lp8755_i2c_driver = {
 541        .driver = {
 542                   .name = LP8755_NAME,
 543                   },
 544        .probe = lp8755_probe,
 545        .remove = lp8755_remove,
 546        .id_table = lp8755_id,
 547};
 548
 549static int __init lp8755_init(void)
 550{
 551        return i2c_add_driver(&lp8755_i2c_driver);
 552}
 553
 554subsys_initcall(lp8755_init);
 555
 556static void __exit lp8755_exit(void)
 557{
 558        i2c_del_driver(&lp8755_i2c_driver);
 559}
 560
 561module_exit(lp8755_exit);
 562
 563MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
 564MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
 565MODULE_LICENSE("GPL v2");
 566
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