drivers/mfd/lm3533-core.c

   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
  50 static struct mfd_cell lm3533_als_devs[] = {
  51         {
  52                 .name   = "lm3533-als",
  53                 .id     = -1,
  54         },
  55 };
  56
  57 static 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
  68 static 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
  87 int 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 }
 105 EXPORT_SYMBOL_GPL(lm3533_read);
 106
 107 int 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 }
 121 EXPORT_SYMBOL_GPL(lm3533_write);
 122
 123 int 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 }
 137 EXPORT_SYMBOL_GPL(lm3533_update);
 138
 139 static 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
 154 static 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  */
 171 static 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  */
 198 static 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
 230 static 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
 236 static 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
 242 enum lm3533_attribute_type {
 243         LM3533_ATTR_TYPE_BACKLIGHT,
 244         LM3533_ATTR_TYPE_LED,
 245 };
 246
 247 struct 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
 260 static 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
 296 static 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  */
 340 static LM3533_OUTPUT_HVLED_ATTR_RW(1);
 341 static LM3533_OUTPUT_HVLED_ATTR_RW(2);
 342 static LM3533_OUTPUT_LVLED_ATTR_RW(1);
 343 static LM3533_OUTPUT_LVLED_ATTR_RW(2);
 344 static LM3533_OUTPUT_LVLED_ATTR_RW(3);
 345 static LM3533_OUTPUT_LVLED_ATTR_RW(4);
 346 static LM3533_OUTPUT_LVLED_ATTR_RW(5);
 347
 348 static 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
 362 static 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
 380 static struct attribute_group lm3533_attribute_group = {
 381         .is_visible     = lm3533_attr_is_visible,
 382         .attrs          = lm3533_attributes
 383 };
 384
 385 static int lm3533_device_als_init(struct lm3533 *lm3533)
 386 {
 387         struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
 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
 408 static int lm3533_device_bl_init(struct lm3533 *lm3533)
 409 {
 410         struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
 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
 437 static int lm3533_device_led_init(struct lm3533 *lm3533)
 438 {
 439         struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
 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
 466 static 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         return lm3533_set_boost_ovp(lm3533, pdata->boost_ovp);
 476 }
 477
 478 static int lm3533_device_init(struct lm3533 *lm3533)
 479 {
 480         struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
 481         int ret;
 482
 483         dev_dbg(lm3533->dev, "%s\n", __func__);
 484
 485         if (!pdata) {
 486                 dev_err(lm3533->dev, "no platform data\n");
 487                 return -EINVAL;
 488         }
 489
 490         lm3533->gpio_hwen = pdata->gpio_hwen;
 491
 492         dev_set_drvdata(lm3533->dev, lm3533);
 493
 494         if (gpio_is_valid(lm3533->gpio_hwen)) {
 495                 ret = devm_gpio_request_one(lm3533->dev, lm3533->gpio_hwen,
 496                                         GPIOF_OUT_INIT_LOW, "lm3533-hwen");
 497                 if (ret < 0) {
 498                         dev_err(lm3533->dev,
 499                                 "failed to request HWEN GPIO %d\n",
 500                                 lm3533->gpio_hwen);
 501                         return ret;
 502                 }
 503         }
 504
 505         lm3533_enable(lm3533);
 506
 507         ret = lm3533_device_setup(lm3533, pdata);
 508         if (ret)
 509                 goto err_disable;
 510
 511         lm3533_device_als_init(lm3533);
 512         lm3533_device_bl_init(lm3533);
 513         lm3533_device_led_init(lm3533);
 514
 515         ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group);
 516         if (ret < 0) {
 517                 dev_err(lm3533->dev, "failed to create sysfs attributes\n");
 518                 goto err_unregister;
 519         }
 520
 521         return 0;
 522
 523 err_unregister:
 524         mfd_remove_devices(lm3533->dev);
 525 err_disable:
 526         lm3533_disable(lm3533);
 527
 528         return ret;
 529 }
 530
 531 static void lm3533_device_exit(struct lm3533 *lm3533)
 532 {
 533         dev_dbg(lm3533->dev, "%s\n", __func__);
 534
 535         sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group);
 536
 537         mfd_remove_devices(lm3533->dev);
 538         lm3533_disable(lm3533);
 539 }
 540
 541 static bool lm3533_readable_register(struct device *dev, unsigned int reg)
 542 {
 543         switch (reg) {
 544         case 0x10 ... 0x2c:
 545         case 0x30 ... 0x38:
 546         case 0x40 ... 0x45:
 547         case 0x50 ... 0x57:
 548         case 0x60 ... 0x6e:
 549         case 0x70 ... 0x75:
 550         case 0x80 ... 0x85:
 551         case 0x90 ... 0x95:
 552         case 0xa0 ... 0xa5:
 553         case 0xb0 ... 0xb2:
 554                 return true;
 555         default:
 556                 return false;
 557         }
 558 }
 559
 560 static bool lm3533_volatile_register(struct device *dev, unsigned int reg)
 561 {
 562         switch (reg) {
 563         case 0x34 ... 0x36:     /* zone */
 564         case 0x37 ... 0x38:     /* adc */
 565         case 0xb0 ... 0xb1:     /* fault */
 566                 return true;
 567         default:
 568                 return false;
 569         }
 570 }
 571
 572 static bool lm3533_precious_register(struct device *dev, unsigned int reg)
 573 {
 574         switch (reg) {
 575         case 0x34:              /* zone */
 576                 return true;
 577         default:
 578                 return false;
 579         }
 580 }
 581
 582 static const struct regmap_config regmap_config = {
 583         .reg_bits       = 8,
 584         .val_bits       = 8,
 585         .max_register   = LM3533_REG_MAX,
 586         .readable_reg   = lm3533_readable_register,
 587         .volatile_reg   = lm3533_volatile_register,
 588         .precious_reg   = lm3533_precious_register,
 589 };
 590
 591 static int lm3533_i2c_probe(struct i2c_client *i2c,
 592                                         const struct i2c_device_id *id)
 593 {
 594         struct lm3533 *lm3533;
 595
 596         dev_dbg(&i2c->dev, "%s\n", __func__);
 597
 598         lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL);
 599         if (!lm3533)
 600                 return -ENOMEM;
 601
 602         i2c_set_clientdata(i2c, lm3533);
 603
 604         lm3533->regmap = devm_regmap_init_i2c(i2c, &regmap_config);
 605         if (IS_ERR(lm3533->regmap))
 606                 return PTR_ERR(lm3533->regmap);
 607
 608         lm3533->dev = &i2c->dev;
 609         lm3533->irq = i2c->irq;
 610
 611         return lm3533_device_init(lm3533);
 612 }
 613
 614 static int lm3533_i2c_remove(struct i2c_client *i2c)
 615 {
 616         struct lm3533 *lm3533 = i2c_get_clientdata(i2c);
 617
 618         dev_dbg(&i2c->dev, "%s\n", __func__);
 619
 620         lm3533_device_exit(lm3533);
 621
 622         return 0;
 623 }
 624
 625 static const struct i2c_device_id lm3533_i2c_ids[] = {
 626         { "lm3533", 0 },
 627         { },
 628 };
 629 MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids);
 630
 631 static struct i2c_driver lm3533_i2c_driver = {
 632         .driver = {
 633                    .name = "lm3533",
 634         },
 635         .id_table       = lm3533_i2c_ids,
 636         .probe          = lm3533_i2c_probe,
 637         .remove         = lm3533_i2c_remove,
 638 };
 639
 640 static int __init lm3533_i2c_init(void)
 641 {
 642         return i2c_add_driver(&lm3533_i2c_driver);
 643 }
 644 subsys_initcall(lm3533_i2c_init);
 645
 646 static void __exit lm3533_i2c_exit(void)
 647 {
 648         i2c_del_driver(&lm3533_i2c_driver);
 649 }
 650 module_exit(lm3533_i2c_exit);
 651
 652 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 653 MODULE_DESCRIPTION("LM3533 Core");
 654 MODULE_LICENSE("GPL");