linux/drivers/mfd/lm3533-core.c
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   1/*
   2 * lm3533-core.c -- LM3533 Core
   3 *
   4 * Copyright (C) 2011-2012 Texas Instruments
   5 *
   6 * Author: Johan Hovold <jhovold@gmail.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify it
   9 * under  the terms of the GNU General  Public License as published by the
  10 * Free Software Foundation;  either version 2 of the License, or (at your
  11 * option) any later version.
  12 */
  13
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/kernel.h>
  17#include <linux/err.h>
  18#include <linux/gpio.h>
  19#include <linux/i2c.h>
  20#include <linux/mfd/core.h>
  21#include <linux/regmap.h>
  22#include <linux/seq_file.h>
  23#include <linux/slab.h>
  24#include <linux/uaccess.h>
  25
  26#include <linux/mfd/lm3533.h>
  27
  28
  29#define LM3533_BOOST_OVP_MASK           0x06
  30#define LM3533_BOOST_OVP_SHIFT          1
  31
  32#define LM3533_BOOST_FREQ_MASK          0x01
  33#define LM3533_BOOST_FREQ_SHIFT         0
  34
  35#define LM3533_BL_ID_MASK               1
  36#define LM3533_LED_ID_MASK              3
  37#define LM3533_BL_ID_MAX                1
  38#define LM3533_LED_ID_MAX               3
  39
  40#define LM3533_HVLED_ID_MAX             2
  41#define LM3533_LVLED_ID_MAX             5
  42
  43#define LM3533_REG_OUTPUT_CONF1         0x10
  44#define LM3533_REG_OUTPUT_CONF2         0x11
  45#define LM3533_REG_BOOST_PWM            0x2c
  46
  47#define LM3533_REG_MAX                  0xb2
  48
  49
  50static struct mfd_cell lm3533_als_devs[] = {
  51        {
  52                .name   = "lm3533-als",
  53                .id     = -1,
  54        },
  55};
  56
  57static struct mfd_cell lm3533_bl_devs[] = {
  58        {
  59                .name   = "lm3533-backlight",
  60                .id     = 0,
  61        },
  62        {
  63                .name   = "lm3533-backlight",
  64                .id     = 1,
  65        },
  66};
  67
  68static struct mfd_cell lm3533_led_devs[] = {
  69        {
  70                .name   = "lm3533-leds",
  71                .id     = 0,
  72        },
  73        {
  74                .name   = "lm3533-leds",
  75                .id     = 1,
  76        },
  77        {
  78                .name   = "lm3533-leds",
  79                .id     = 2,
  80        },
  81        {
  82                .name   = "lm3533-leds",
  83                .id     = 3,
  84        },
  85};
  86
  87int lm3533_read(struct lm3533 *lm3533, u8 reg, u8 *val)
  88{
  89        int tmp;
  90        int ret;
  91
  92        ret = regmap_read(lm3533->regmap, reg, &tmp);
  93        if (ret < 0) {
  94                dev_err(lm3533->dev, "failed to read register %02x: %d\n",
  95                                                                reg, ret);
  96                return ret;
  97        }
  98
  99        *val = tmp;
 100
 101        dev_dbg(lm3533->dev, "read [%02x]: %02x\n", reg, *val);
 102
 103        return ret;
 104}
 105EXPORT_SYMBOL_GPL(lm3533_read);
 106
 107int lm3533_write(struct lm3533 *lm3533, u8 reg, u8 val)
 108{
 109        int ret;
 110
 111        dev_dbg(lm3533->dev, "write [%02x]: %02x\n", reg, val);
 112
 113        ret = regmap_write(lm3533->regmap, reg, val);
 114        if (ret < 0) {
 115                dev_err(lm3533->dev, "failed to write register %02x: %d\n",
 116                                                                reg, ret);
 117        }
 118
 119        return ret;
 120}
 121EXPORT_SYMBOL_GPL(lm3533_write);
 122
 123int lm3533_update(struct lm3533 *lm3533, u8 reg, u8 val, u8 mask)
 124{
 125        int ret;
 126
 127        dev_dbg(lm3533->dev, "update [%02x]: %02x/%02x\n", reg, val, mask);
 128
 129        ret = regmap_update_bits(lm3533->regmap, reg, mask, val);
 130        if (ret < 0) {
 131                dev_err(lm3533->dev, "failed to update register %02x: %d\n",
 132                                                                reg, ret);
 133        }
 134
 135        return ret;
 136}
 137EXPORT_SYMBOL_GPL(lm3533_update);
 138
 139static int lm3533_set_boost_freq(struct lm3533 *lm3533,
 140                                                enum lm3533_boost_freq freq)
 141{
 142        int ret;
 143
 144        ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
 145                                        freq << LM3533_BOOST_FREQ_SHIFT,
 146                                        LM3533_BOOST_FREQ_MASK);
 147        if (ret)
 148                dev_err(lm3533->dev, "failed to set boost frequency\n");
 149
 150        return ret;
 151}
 152
 153
 154static int lm3533_set_boost_ovp(struct lm3533 *lm3533,
 155                                                enum lm3533_boost_ovp ovp)
 156{
 157        int ret;
 158
 159        ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
 160                                        ovp << LM3533_BOOST_OVP_SHIFT,
 161                                        LM3533_BOOST_OVP_MASK);
 162        if (ret)
 163                dev_err(lm3533->dev, "failed to set boost ovp\n");
 164
 165        return ret;
 166}
 167
 168/*
 169 * HVLED output config -- output hvled controlled by backlight bl
 170 */
 171static int lm3533_set_hvled_config(struct lm3533 *lm3533, u8 hvled, u8 bl)
 172{
 173        u8 val;
 174        u8 mask;
 175        int shift;
 176        int ret;
 177
 178        if (hvled == 0 || hvled > LM3533_HVLED_ID_MAX)
 179                return -EINVAL;
 180
 181        if (bl > LM3533_BL_ID_MAX)
 182                return -EINVAL;
 183
 184        shift = hvled - 1;
 185        mask = LM3533_BL_ID_MASK << shift;
 186        val = bl << shift;
 187
 188        ret = lm3533_update(lm3533, LM3533_REG_OUTPUT_CONF1, val, mask);
 189        if (ret)
 190                dev_err(lm3533->dev, "failed to set hvled config\n");
 191
 192        return ret;
 193}
 194
 195/*
 196 * LVLED output config -- output lvled controlled by LED led
 197 */
 198static int lm3533_set_lvled_config(struct lm3533 *lm3533, u8 lvled, u8 led)
 199{
 200        u8 reg;
 201        u8 val;
 202        u8 mask;
 203        int shift;
 204        int ret;
 205
 206        if (lvled == 0 || lvled > LM3533_LVLED_ID_MAX)
 207                return -EINVAL;
 208
 209        if (led > LM3533_LED_ID_MAX)
 210                return -EINVAL;
 211
 212        if (lvled < 4) {
 213                reg = LM3533_REG_OUTPUT_CONF1;
 214                shift = 2 * lvled;
 215        } else {
 216                reg = LM3533_REG_OUTPUT_CONF2;
 217                shift = 2 * (lvled - 4);
 218        }
 219
 220        mask = LM3533_LED_ID_MASK << shift;
 221        val = led << shift;
 222
 223        ret = lm3533_update(lm3533, reg, val, mask);
 224        if (ret)
 225                dev_err(lm3533->dev, "failed to set lvled config\n");
 226
 227        return ret;
 228}
 229
 230static void lm3533_enable(struct lm3533 *lm3533)
 231{
 232        if (gpio_is_valid(lm3533->gpio_hwen))
 233                gpio_set_value(lm3533->gpio_hwen, 1);
 234}
 235
 236static void lm3533_disable(struct lm3533 *lm3533)
 237{
 238        if (gpio_is_valid(lm3533->gpio_hwen))
 239                gpio_set_value(lm3533->gpio_hwen, 0);
 240}
 241
 242enum lm3533_attribute_type {
 243        LM3533_ATTR_TYPE_BACKLIGHT,
 244        LM3533_ATTR_TYPE_LED,
 245};
 246
 247struct lm3533_device_attribute {
 248        struct device_attribute dev_attr;
 249        enum lm3533_attribute_type type;
 250        union {
 251                struct {
 252                        u8 id;
 253                } output;
 254        } u;
 255};
 256
 257#define to_lm3533_dev_attr(_attr) \
 258        container_of(_attr, struct lm3533_device_attribute, dev_attr)
 259
 260static ssize_t show_output(struct device *dev,
 261                                struct device_attribute *attr, char *buf)
 262{
 263        struct lm3533 *lm3533 = dev_get_drvdata(dev);
 264        struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
 265        int id = lattr->u.output.id;
 266        u8 reg;
 267        u8 val;
 268        u8 mask;
 269        int shift;
 270        int ret;
 271
 272        if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) {
 273                reg = LM3533_REG_OUTPUT_CONF1;
 274                shift = id - 1;
 275                mask = LM3533_BL_ID_MASK << shift;
 276        } else {
 277                if (id < 4) {
 278                        reg = LM3533_REG_OUTPUT_CONF1;
 279                        shift = 2 * id;
 280                } else {
 281                        reg = LM3533_REG_OUTPUT_CONF2;
 282                        shift = 2 * (id - 4);
 283                }
 284                mask = LM3533_LED_ID_MASK << shift;
 285        }
 286
 287        ret = lm3533_read(lm3533, reg, &val);
 288        if (ret)
 289                return ret;
 290
 291        val = (val & mask) >> shift;
 292
 293        return scnprintf(buf, PAGE_SIZE, "%u\n", val);
 294}
 295
 296static ssize_t store_output(struct device *dev,
 297                                        struct device_attribute *attr,
 298                                        const char *buf, size_t len)
 299{
 300        struct lm3533 *lm3533 = dev_get_drvdata(dev);
 301        struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
 302        int id = lattr->u.output.id;
 303        u8 val;
 304        int ret;
 305
 306        if (kstrtou8(buf, 0, &val))
 307                return -EINVAL;
 308
 309        if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT)
 310                ret = lm3533_set_hvled_config(lm3533, id, val);
 311        else
 312                ret = lm3533_set_lvled_config(lm3533, id, val);
 313
 314        if (ret)
 315                return ret;
 316
 317        return len;
 318}
 319
 320#define LM3533_OUTPUT_ATTR(_name, _mode, _show, _store, _type, _id) \
 321        struct lm3533_device_attribute lm3533_dev_attr_##_name = \
 322                { .dev_attr     = __ATTR(_name, _mode, _show, _store), \
 323                  .type         = _type, \
 324                  .u.output     = { .id = _id }, }
 325
 326#define LM3533_OUTPUT_ATTR_RW(_name, _type, _id) \
 327        LM3533_OUTPUT_ATTR(output_##_name, S_IRUGO | S_IWUSR, \
 328                                        show_output, store_output, _type, _id)
 329
 330#define LM3533_OUTPUT_HVLED_ATTR_RW(_nr) \
 331        LM3533_OUTPUT_ATTR_RW(hvled##_nr, LM3533_ATTR_TYPE_BACKLIGHT, _nr)
 332#define LM3533_OUTPUT_LVLED_ATTR_RW(_nr) \
 333        LM3533_OUTPUT_ATTR_RW(lvled##_nr, LM3533_ATTR_TYPE_LED, _nr)
 334/*
 335 * Output config:
 336 *
 337 * output_hvled<nr>     0-1
 338 * output_lvled<nr>     0-3
 339 */
 340static LM3533_OUTPUT_HVLED_ATTR_RW(1);
 341static LM3533_OUTPUT_HVLED_ATTR_RW(2);
 342static LM3533_OUTPUT_LVLED_ATTR_RW(1);
 343static LM3533_OUTPUT_LVLED_ATTR_RW(2);
 344static LM3533_OUTPUT_LVLED_ATTR_RW(3);
 345static LM3533_OUTPUT_LVLED_ATTR_RW(4);
 346static LM3533_OUTPUT_LVLED_ATTR_RW(5);
 347
 348static struct attribute *lm3533_attributes[] = {
 349        &lm3533_dev_attr_output_hvled1.dev_attr.attr,
 350        &lm3533_dev_attr_output_hvled2.dev_attr.attr,
 351        &lm3533_dev_attr_output_lvled1.dev_attr.attr,
 352        &lm3533_dev_attr_output_lvled2.dev_attr.attr,
 353        &lm3533_dev_attr_output_lvled3.dev_attr.attr,
 354        &lm3533_dev_attr_output_lvled4.dev_attr.attr,
 355        &lm3533_dev_attr_output_lvled5.dev_attr.attr,
 356        NULL,
 357};
 358
 359#define to_dev_attr(_attr) \
 360        container_of(_attr, struct device_attribute, attr)
 361
 362static umode_t lm3533_attr_is_visible(struct kobject *kobj,
 363                                             struct attribute *attr, int n)
 364{
 365        struct device *dev = container_of(kobj, struct device, kobj);
 366        struct lm3533 *lm3533 = dev_get_drvdata(dev);
 367        struct device_attribute *dattr = to_dev_attr(attr);
 368        struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(dattr);
 369        enum lm3533_attribute_type type = lattr->type;
 370        umode_t mode = attr->mode;
 371
 372        if (!lm3533->have_backlights && type == LM3533_ATTR_TYPE_BACKLIGHT)
 373                mode = 0;
 374        else if (!lm3533->have_leds && type == LM3533_ATTR_TYPE_LED)
 375                mode = 0;
 376
 377        return mode;
 378};
 379
 380static struct attribute_group lm3533_attribute_group = {
 381        .is_visible     = lm3533_attr_is_visible,
 382        .attrs          = lm3533_attributes
 383};
 384
 385static int lm3533_device_als_init(struct lm3533 *lm3533)
 386{
 387        struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
 388        int ret;
 389
 390        if (!pdata->als)
 391                return 0;
 392
 393        lm3533_als_devs[0].platform_data = pdata->als;
 394        lm3533_als_devs[0].pdata_size = sizeof(*pdata->als);
 395
 396        ret = mfd_add_devices(lm3533->dev, 0, lm3533_als_devs, 1, NULL,
 397                              0, NULL);
 398        if (ret) {
 399                dev_err(lm3533->dev, "failed to add ALS device\n");
 400                return ret;
 401        }
 402
 403        lm3533->have_als = 1;
 404
 405        return 0;
 406}
 407
 408static int lm3533_device_bl_init(struct lm3533 *lm3533)
 409{
 410        struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
 411        int i;
 412        int ret;
 413
 414        if (!pdata->backlights || pdata->num_backlights == 0)
 415                return 0;
 416
 417        if (pdata->num_backlights > ARRAY_SIZE(lm3533_bl_devs))
 418                pdata->num_backlights = ARRAY_SIZE(lm3533_bl_devs);
 419
 420        for (i = 0; i < pdata->num_backlights; ++i) {
 421                lm3533_bl_devs[i].platform_data = &pdata->backlights[i];
 422                lm3533_bl_devs[i].pdata_size = sizeof(pdata->backlights[i]);
 423        }
 424
 425        ret = mfd_add_devices(lm3533->dev, 0, lm3533_bl_devs,
 426                              pdata->num_backlights, NULL, 0, NULL);
 427        if (ret) {
 428                dev_err(lm3533->dev, "failed to add backlight devices\n");
 429                return ret;
 430        }
 431
 432        lm3533->have_backlights = 1;
 433
 434        return 0;
 435}
 436
 437static int lm3533_device_led_init(struct lm3533 *lm3533)
 438{
 439        struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
 440        int i;
 441        int ret;
 442
 443        if (!pdata->leds || pdata->num_leds == 0)
 444                return 0;
 445
 446        if (pdata->num_leds > ARRAY_SIZE(lm3533_led_devs))
 447                pdata->num_leds = ARRAY_SIZE(lm3533_led_devs);
 448
 449        for (i = 0; i < pdata->num_leds; ++i) {
 450                lm3533_led_devs[i].platform_data = &pdata->leds[i];
 451                lm3533_led_devs[i].pdata_size = sizeof(pdata->leds[i]);
 452        }
 453
 454        ret = mfd_add_devices(lm3533->dev, 0, lm3533_led_devs,
 455                              pdata->num_leds, NULL, 0, NULL);
 456        if (ret) {
 457                dev_err(lm3533->dev, "failed to add LED devices\n");
 458                return ret;
 459        }
 460
 461        lm3533->have_leds = 1;
 462
 463        return 0;
 464}
 465
 466static int lm3533_device_setup(struct lm3533 *lm3533,
 467                                        struct lm3533_platform_data *pdata)
 468{
 469        int ret;
 470
 471        ret = lm3533_set_boost_freq(lm3533, pdata->boost_freq);
 472        if (ret)
 473                return ret;
 474
 475        ret = lm3533_set_boost_ovp(lm3533, pdata->boost_ovp);
 476        if (ret)
 477                return ret;
 478
 479        return 0;
 480}
 481
 482static int lm3533_device_init(struct lm3533 *lm3533)
 483{
 484        struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
 485        int ret;
 486
 487        dev_dbg(lm3533->dev, "%s\n", __func__);
 488
 489        if (!pdata) {
 490                dev_err(lm3533->dev, "no platform data\n");
 491                return -EINVAL;
 492        }
 493
 494        lm3533->gpio_hwen = pdata->gpio_hwen;
 495
 496        dev_set_drvdata(lm3533->dev, lm3533);
 497
 498        if (gpio_is_valid(lm3533->gpio_hwen)) {
 499                ret = gpio_request_one(lm3533->gpio_hwen, GPIOF_OUT_INIT_LOW,
 500                                                                "lm3533-hwen");
 501                if (ret < 0) {
 502                        dev_err(lm3533->dev,
 503                                "failed to request HWEN GPIO %d\n",
 504                                lm3533->gpio_hwen);
 505                        return ret;
 506                }
 507        }
 508
 509        lm3533_enable(lm3533);
 510
 511        ret = lm3533_device_setup(lm3533, pdata);
 512        if (ret)
 513                goto err_disable;
 514
 515        lm3533_device_als_init(lm3533);
 516        lm3533_device_bl_init(lm3533);
 517        lm3533_device_led_init(lm3533);
 518
 519        ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group);
 520        if (ret < 0) {
 521                dev_err(lm3533->dev, "failed to create sysfs attributes\n");
 522                goto err_unregister;
 523        }
 524
 525        return 0;
 526
 527err_unregister:
 528        mfd_remove_devices(lm3533->dev);
 529err_disable:
 530        lm3533_disable(lm3533);
 531        if (gpio_is_valid(lm3533->gpio_hwen))
 532                gpio_free(lm3533->gpio_hwen);
 533
 534        return ret;
 535}
 536
 537static void lm3533_device_exit(struct lm3533 *lm3533)
 538{
 539        dev_dbg(lm3533->dev, "%s\n", __func__);
 540
 541        sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group);
 542
 543        mfd_remove_devices(lm3533->dev);
 544        lm3533_disable(lm3533);
 545        if (gpio_is_valid(lm3533->gpio_hwen))
 546                gpio_free(lm3533->gpio_hwen);
 547}
 548
 549static bool lm3533_readable_register(struct device *dev, unsigned int reg)
 550{
 551        switch (reg) {
 552        case 0x10 ... 0x2c:
 553        case 0x30 ... 0x38:
 554        case 0x40 ... 0x45:
 555        case 0x50 ... 0x57:
 556        case 0x60 ... 0x6e:
 557        case 0x70 ... 0x75:
 558        case 0x80 ... 0x85:
 559        case 0x90 ... 0x95:
 560        case 0xa0 ... 0xa5:
 561        case 0xb0 ... 0xb2:
 562                return true;
 563        default:
 564                return false;
 565        }
 566}
 567
 568static bool lm3533_volatile_register(struct device *dev, unsigned int reg)
 569{
 570        switch (reg) {
 571        case 0x34 ... 0x36:     /* zone */
 572        case 0x37 ... 0x38:     /* adc */
 573        case 0xb0 ... 0xb1:     /* fault */
 574                return true;
 575        default:
 576                return false;
 577        }
 578}
 579
 580static bool lm3533_precious_register(struct device *dev, unsigned int reg)
 581{
 582        switch (reg) {
 583        case 0x34:              /* zone */
 584                return true;
 585        default:
 586                return false;
 587        }
 588}
 589
 590static struct regmap_config regmap_config = {
 591        .reg_bits       = 8,
 592        .val_bits       = 8,
 593        .max_register   = LM3533_REG_MAX,
 594        .readable_reg   = lm3533_readable_register,
 595        .volatile_reg   = lm3533_volatile_register,
 596        .precious_reg   = lm3533_precious_register,
 597};
 598
 599static int lm3533_i2c_probe(struct i2c_client *i2c,
 600                                        const struct i2c_device_id *id)
 601{
 602        struct lm3533 *lm3533;
 603        int ret;
 604
 605        dev_dbg(&i2c->dev, "%s\n", __func__);
 606
 607        lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL);
 608        if (!lm3533)
 609                return -ENOMEM;
 610
 611        i2c_set_clientdata(i2c, lm3533);
 612
 613        lm3533->regmap = devm_regmap_init_i2c(i2c, &regmap_config);
 614        if (IS_ERR(lm3533->regmap))
 615                return PTR_ERR(lm3533->regmap);
 616
 617        lm3533->dev = &i2c->dev;
 618        lm3533->irq = i2c->irq;
 619
 620        ret = lm3533_device_init(lm3533);
 621        if (ret)
 622                return ret;
 623
 624        return 0;
 625}
 626
 627static int lm3533_i2c_remove(struct i2c_client *i2c)
 628{
 629        struct lm3533 *lm3533 = i2c_get_clientdata(i2c);
 630
 631        dev_dbg(&i2c->dev, "%s\n", __func__);
 632
 633        lm3533_device_exit(lm3533);
 634
 635        return 0;
 636}
 637
 638static const struct i2c_device_id lm3533_i2c_ids[] = {
 639        { "lm3533", 0 },
 640        { },
 641};
 642MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids);
 643
 644static struct i2c_driver lm3533_i2c_driver = {
 645        .driver = {
 646                   .name = "lm3533",
 647                   .owner = THIS_MODULE,
 648        },
 649        .id_table       = lm3533_i2c_ids,
 650        .probe          = lm3533_i2c_probe,
 651        .remove         = lm3533_i2c_remove,
 652};
 653
 654static int __init lm3533_i2c_init(void)
 655{
 656        return i2c_add_driver(&lm3533_i2c_driver);
 657}
 658subsys_initcall(lm3533_i2c_init);
 659
 660static void __exit lm3533_i2c_exit(void)
 661{
 662        i2c_del_driver(&lm3533_i2c_driver);
 663}
 664module_exit(lm3533_i2c_exit);
 665
 666MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 667MODULE_DESCRIPTION("LM3533 Core");
 668MODULE_LICENSE("GPL");
 669
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