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 __devinit 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, 0);
 397         if (ret) {
 398                 dev_err(lm3533->dev, "failed to add ALS device\n");
 399                 return ret;
 400         }
 401
 402         lm3533->have_als = 1;
 403
 404         return 0;
 405 }
 406
 407 static int __devinit lm3533_device_bl_init(struct lm3533 *lm3533)
 408 {
 409         struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
 410         int i;
 411         int ret;
 412
 413         if (!pdata->backlights || pdata->num_backlights == 0)
 414                 return 0;
 415
 416         if (pdata->num_backlights > ARRAY_SIZE(lm3533_bl_devs))
 417                 pdata->num_backlights = ARRAY_SIZE(lm3533_bl_devs);
 418
 419         for (i = 0; i < pdata->num_backlights; ++i) {
 420                 lm3533_bl_devs[i].platform_data = &pdata->backlights[i];
 421                 lm3533_bl_devs[i].pdata_size = sizeof(pdata->backlights[i]);
 422         }
 423
 424         ret = mfd_add_devices(lm3533->dev, 0, lm3533_bl_devs,
 425                                         pdata->num_backlights, NULL, 0);
 426         if (ret) {
 427                 dev_err(lm3533->dev, "failed to add backlight devices\n");
 428                 return ret;
 429         }
 430
 431         lm3533->have_backlights = 1;
 432
 433         return 0;
 434 }
 435
 436 static int __devinit lm3533_device_led_init(struct lm3533 *lm3533)
 437 {
 438         struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
 439         int i;
 440         int ret;
 441
 442         if (!pdata->leds || pdata->num_leds == 0)
 443                 return 0;
 444
 445         if (pdata->num_leds > ARRAY_SIZE(lm3533_led_devs))
 446                 pdata->num_leds = ARRAY_SIZE(lm3533_led_devs);
 447
 448         for (i = 0; i < pdata->num_leds; ++i) {
 449                 lm3533_led_devs[i].platform_data = &pdata->leds[i];
 450                 lm3533_led_devs[i].pdata_size = sizeof(pdata->leds[i]);
 451         }
 452
 453         ret = mfd_add_devices(lm3533->dev, 0, lm3533_led_devs,
 454                                                 pdata->num_leds, NULL, 0);
 455         if (ret) {
 456                 dev_err(lm3533->dev, "failed to add LED devices\n");
 457                 return ret;
 458         }
 459
 460         lm3533->have_leds = 1;
 461
 462         return 0;
 463 }
 464
 465 static int __devinit lm3533_device_setup(struct lm3533 *lm3533,
 466                                         struct lm3533_platform_data *pdata)
 467 {
 468         int ret;
 469
 470         ret = lm3533_set_boost_freq(lm3533, pdata->boost_freq);
 471         if (ret)
 472                 return ret;
 473
 474         ret = lm3533_set_boost_ovp(lm3533, pdata->boost_ovp);
 475         if (ret)
 476                 return ret;
 477
 478         return 0;
 479 }
 480
 481 static int __devinit lm3533_device_init(struct lm3533 *lm3533)
 482 {
 483         struct lm3533_platform_data *pdata = lm3533->dev->platform_data;
 484         int ret;
 485
 486         dev_dbg(lm3533->dev, "%s\n", __func__);
 487
 488         if (!pdata) {
 489                 dev_err(lm3533->dev, "no platform data\n");
 490                 return -EINVAL;
 491         }
 492
 493         lm3533->gpio_hwen = pdata->gpio_hwen;
 494
 495         dev_set_drvdata(lm3533->dev, lm3533);
 496
 497         if (gpio_is_valid(lm3533->gpio_hwen)) {
 498                 ret = gpio_request_one(lm3533->gpio_hwen, GPIOF_OUT_INIT_LOW,
 499                                                                 "lm3533-hwen");
 500                 if (ret < 0) {
 501                         dev_err(lm3533->dev,
 502                                 "failed to request HWEN GPIO %d\n",
 503                                 lm3533->gpio_hwen);
 504                         return ret;
 505                 }
 506         }
 507
 508         lm3533_enable(lm3533);
 509
 510         ret = lm3533_device_setup(lm3533, pdata);
 511         if (ret)
 512                 goto err_disable;
 513
 514         lm3533_device_als_init(lm3533);
 515         lm3533_device_bl_init(lm3533);
 516         lm3533_device_led_init(lm3533);
 517
 518         ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group);
 519         if (ret < 0) {
 520                 dev_err(lm3533->dev, "failed to create sysfs attributes\n");
 521                 goto err_unregister;
 522         }
 523
 524         return 0;
 525
 526 err_unregister:
 527         mfd_remove_devices(lm3533->dev);
 528 err_disable:
 529         lm3533_disable(lm3533);
 530         if (gpio_is_valid(lm3533->gpio_hwen))
 531                 gpio_free(lm3533->gpio_hwen);
 532
 533         return ret;
 534 }
 535
 536 static void __devexit lm3533_device_exit(struct lm3533 *lm3533)
 537 {
 538         dev_dbg(lm3533->dev, "%s\n", __func__);
 539
 540         sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group);
 541
 542         mfd_remove_devices(lm3533->dev);
 543         lm3533_disable(lm3533);
 544         if (gpio_is_valid(lm3533->gpio_hwen))
 545                 gpio_free(lm3533->gpio_hwen);
 546 }
 547
 548 static bool lm3533_readable_register(struct device *dev, unsigned int reg)
 549 {
 550         switch (reg) {
 551         case 0x10 ... 0x2c:
 552         case 0x30 ... 0x38:
 553         case 0x40 ... 0x45:
 554         case 0x50 ... 0x57:
 555         case 0x60 ... 0x6e:
 556         case 0x70 ... 0x75:
 557         case 0x80 ... 0x85:
 558         case 0x90 ... 0x95:
 559         case 0xa0 ... 0xa5:
 560         case 0xb0 ... 0xb2:
 561                 return true;
 562         default:
 563                 return false;
 564         }
 565 }
 566
 567 static bool lm3533_volatile_register(struct device *dev, unsigned int reg)
 568 {
 569         switch (reg) {
 570         case 0x34 ... 0x36:     /* zone */
 571         case 0x37 ... 0x38:     /* adc */
 572         case 0xb0 ... 0xb1:     /* fault */
 573                 return true;
 574         default:
 575                 return false;
 576         }
 577 }
 578
 579 static bool lm3533_precious_register(struct device *dev, unsigned int reg)
 580 {
 581         switch (reg) {
 582         case 0x34:              /* zone */
 583                 return true;
 584         default:
 585                 return false;
 586         }
 587 }
 588
 589 static struct regmap_config regmap_config = {
 590         .reg_bits       = 8,
 591         .val_bits       = 8,
 592         .max_register   = LM3533_REG_MAX,
 593         .readable_reg   = lm3533_readable_register,
 594         .volatile_reg   = lm3533_volatile_register,
 595         .precious_reg   = lm3533_precious_register,
 596 };
 597
 598 static int __devinit lm3533_i2c_probe(struct i2c_client *i2c,
 599                                         const struct i2c_device_id *id)
 600 {
 601         struct lm3533 *lm3533;
 602         int ret;
 603
 604         dev_dbg(&i2c->dev, "%s\n", __func__);
 605
 606         lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL);
 607         if (!lm3533)
 608                 return -ENOMEM;
 609
 610         i2c_set_clientdata(i2c, lm3533);
 611
 612         lm3533->regmap = devm_regmap_init_i2c(i2c, &regmap_config);
 613         if (IS_ERR(lm3533->regmap))
 614                 return PTR_ERR(lm3533->regmap);
 615
 616         lm3533->dev = &i2c->dev;
 617         lm3533->irq = i2c->irq;
 618
 619         ret = lm3533_device_init(lm3533);
 620         if (ret)
 621                 return ret;
 622
 623         return 0;
 624 }
 625
 626 static int __devexit lm3533_i2c_remove(struct i2c_client *i2c)
 627 {
 628         struct lm3533 *lm3533 = i2c_get_clientdata(i2c);
 629
 630         dev_dbg(&i2c->dev, "%s\n", __func__);
 631
 632         lm3533_device_exit(lm3533);
 633
 634         return 0;
 635 }
 636
 637 static const struct i2c_device_id lm3533_i2c_ids[] = {
 638         { "lm3533", 0 },
 639         { },
 640 };
 641 MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids);
 642
 643 static struct i2c_driver lm3533_i2c_driver = {
 644         .driver = {
 645                    .name = "lm3533",
 646                    .owner = THIS_MODULE,
 647         },
 648         .id_table       = lm3533_i2c_ids,
 649         .probe          = lm3533_i2c_probe,
 650         .remove         = __devexit_p(lm3533_i2c_remove),
 651 };
 652
 653 static int __init lm3533_i2c_init(void)
 654 {
 655         return i2c_add_driver(&lm3533_i2c_driver);
 656 }
 657 subsys_initcall(lm3533_i2c_init);
 658
 659 static void __exit lm3533_i2c_exit(void)
 660 {
 661         i2c_del_driver(&lm3533_i2c_driver);
 662 }
 663 module_exit(lm3533_i2c_exit);
 664
 665 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 666 MODULE_DESCRIPTION("LM3533 Core");
 667 MODULE_LICENSE("GPL");