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/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
  40struct lp8755_mphase {
  41        int nreg;
  42        int buck_num[LP8755_BUCK_MAX];
  43};
  44
  45struct 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 */
  63static 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 */
  75static 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 */
  88static 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
  94static 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
 109static 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;
 147err_i2c:
 148        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 149        return ret;
 150}
 151
 152static 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
 178err_i2c:
 179        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 180        return 0;
 181}
 182
 183static 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;
 226err_i2c:
 227        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 228        return ret;
 229}
 230
 231static 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
 255static 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
 264static 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
 278static 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
 297out_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
 318static 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
 327static 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
 354err_buck:
 355        for (icnt = 0; icnt < LP8755_BUCK_MAX; icnt++)
 356                regulator_unregister(pchip->rdev[icnt]);
 357        return ret;
 358}
 359
 360static 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
 410err_i2c:
 411        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 412        return IRQ_NONE;
 413}
 414
 415static 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
 437err_i2c:
 438        dev_err(pchip->dev, "i2c acceess error %s\n", __func__);
 439        return ret;
 440}
 441
 442static const struct regmap_config lp8755_regmap = {
 443        .reg_bits = 8,
 444        .val_bits = 8,
 445        .max_register = LP8755_REG_MAX,
 446};
 447
 448static 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
 505err_irq:
 506        for (icnt = 0; icnt < mphase_buck[pchip->mphase].nreg; icnt++)
 507                regulator_unregister(pchip->rdev[icnt]);
 508
 509err_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
 517static 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
 534static const struct i2c_device_id lp8755_id[] = {
 535        {LP8755_NAME, 0},
 536        {}
 537};
 538
 539MODULE_DEVICE_TABLE(i2c, lp8755_id);
 540
 541static 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
 550static int __init lp8755_init(void)
 551{
 552        return i2c_add_driver(&lp8755_i2c_driver);
 553}
 554
 555subsys_initcall(lp8755_init);
 556
 557static void __exit lp8755_exit(void)
 558{
 559        i2c_del_driver(&lp8755_i2c_driver);
 560}
 561
 562module_exit(lp8755_exit);
 563
 564MODULE_DESCRIPTION("Texas Instruments lp8755 driver");
 565MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
 566MODULE_LICENSE("GPL v2");
 567
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