drivers/mfd/lm3533-core.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * lm3533-core.c -- LM3533 Core
   4  *
   5  * Copyright (C) 2011-2012 Texas Instruments
   6  *
   7  * Author: Johan Hovold <jhovold@gmail.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/err.h>
  14 #include <linux/gpio.h>
  15 #include <linux/i2c.h>
  16 #include <linux/mfd/core.h>
  17 #include <linux/regmap.h>
  18 #include <linux/seq_file.h>
  19 #include <linux/slab.h>
  20 #include <linux/uaccess.h>
  21
  22 #include <linux/mfd/lm3533.h>
  23
  24
  25 #define LM3533_BOOST_OVP_MASK           0x06
  26 #define LM3533_BOOST_OVP_SHIFT          1
  27
  28 #define LM3533_BOOST_FREQ_MASK          0x01
  29 #define LM3533_BOOST_FREQ_SHIFT         0
  30
  31 #define LM3533_BL_ID_MASK               1
  32 #define LM3533_LED_ID_MASK              3
  33 #define LM3533_BL_ID_MAX                1
  34 #define LM3533_LED_ID_MAX               3
  35
  36 #define LM3533_HVLED_ID_MAX             2
  37 #define LM3533_LVLED_ID_MAX             5
  38
  39 #define LM3533_REG_OUTPUT_CONF1         0x10
  40 #define LM3533_REG_OUTPUT_CONF2         0x11
  41 #define LM3533_REG_BOOST_PWM            0x2c
  42
  43 #define LM3533_REG_MAX                  0xb2
  44
  45
  46 static struct mfd_cell lm3533_als_devs[] = {
  47         {
  48                 .name   = "lm3533-als",
  49                 .id     = -1,
  50         },
  51 };
  52
  53 static struct mfd_cell lm3533_bl_devs[] = {
  54         {
  55                 .name   = "lm3533-backlight",
  56                 .id     = 0,
  57         },
  58         {
  59                 .name   = "lm3533-backlight",
  60                 .id     = 1,
  61         },
  62 };
  63
  64 static struct mfd_cell lm3533_led_devs[] = {
  65         {
  66                 .name   = "lm3533-leds",
  67                 .id     = 0,
  68         },
  69         {
  70                 .name   = "lm3533-leds",
  71                 .id     = 1,
  72         },
  73         {
  74                 .name   = "lm3533-leds",
  75                 .id     = 2,
  76         },
  77         {
  78                 .name   = "lm3533-leds",
  79                 .id     = 3,
  80         },
  81 };
  82
  83 int lm3533_read(struct lm3533 *lm3533, u8 reg, u8 *val)
  84 {
  85         int tmp;
  86         int ret;
  87
  88         ret = regmap_read(lm3533->regmap, reg, &tmp);
  89         if (ret < 0) {
  90                 dev_err(lm3533->dev, "failed to read register %02x: %d\n",
  91                                                                 reg, ret);
  92                 return ret;
  93         }
  94
  95         *val = tmp;
  96
  97         dev_dbg(lm3533->dev, "read [%02x]: %02x\n", reg, *val);
  98
  99         return ret;
 100 }
 101 EXPORT_SYMBOL_GPL(lm3533_read);
 102
 103 int lm3533_write(struct lm3533 *lm3533, u8 reg, u8 val)
 104 {
 105         int ret;
 106
 107         dev_dbg(lm3533->dev, "write [%02x]: %02x\n", reg, val);
 108
 109         ret = regmap_write(lm3533->regmap, reg, val);
 110         if (ret < 0) {
 111                 dev_err(lm3533->dev, "failed to write register %02x: %d\n",
 112                                                                 reg, ret);
 113         }
 114
 115         return ret;
 116 }
 117 EXPORT_SYMBOL_GPL(lm3533_write);
 118
 119 int lm3533_update(struct lm3533 *lm3533, u8 reg, u8 val, u8 mask)
 120 {
 121         int ret;
 122
 123         dev_dbg(lm3533->dev, "update [%02x]: %02x/%02x\n", reg, val, mask);
 124
 125         ret = regmap_update_bits(lm3533->regmap, reg, mask, val);
 126         if (ret < 0) {
 127                 dev_err(lm3533->dev, "failed to update register %02x: %d\n",
 128                                                                 reg, ret);
 129         }
 130
 131         return ret;
 132 }
 133 EXPORT_SYMBOL_GPL(lm3533_update);
 134
 135 static int lm3533_set_boost_freq(struct lm3533 *lm3533,
 136                                                 enum lm3533_boost_freq freq)
 137 {
 138         int ret;
 139
 140         ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
 141                                         freq << LM3533_BOOST_FREQ_SHIFT,
 142                                         LM3533_BOOST_FREQ_MASK);
 143         if (ret)
 144                 dev_err(lm3533->dev, "failed to set boost frequency\n");
 145
 146         return ret;
 147 }
 148
 149
 150 static int lm3533_set_boost_ovp(struct lm3533 *lm3533,
 151                                                 enum lm3533_boost_ovp ovp)
 152 {
 153         int ret;
 154
 155         ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
 156                                         ovp << LM3533_BOOST_OVP_SHIFT,
 157                                         LM3533_BOOST_OVP_MASK);
 158         if (ret)
 159                 dev_err(lm3533->dev, "failed to set boost ovp\n");
 160
 161         return ret;
 162 }
 163
 164 /*
 165  * HVLED output config -- output hvled controlled by backlight bl
 166  */
 167 static int lm3533_set_hvled_config(struct lm3533 *lm3533, u8 hvled, u8 bl)
 168 {
 169         u8 val;
 170         u8 mask;
 171         int shift;
 172         int ret;
 173
 174         if (hvled == 0 || hvled > LM3533_HVLED_ID_MAX)
 175                 return -EINVAL;
 176
 177         if (bl > LM3533_BL_ID_MAX)
 178                 return -EINVAL;
 179
 180         shift = hvled - 1;
 181         mask = LM3533_BL_ID_MASK << shift;
 182         val = bl << shift;
 183
 184         ret = lm3533_update(lm3533, LM3533_REG_OUTPUT_CONF1, val, mask);
 185         if (ret)
 186                 dev_err(lm3533->dev, "failed to set hvled config\n");
 187
 188         return ret;
 189 }
 190
 191 /*
 192  * LVLED output config -- output lvled controlled by LED led
 193  */
 194 static int lm3533_set_lvled_config(struct lm3533 *lm3533, u8 lvled, u8 led)
 195 {
 196         u8 reg;
 197         u8 val;
 198         u8 mask;
 199         int shift;
 200         int ret;
 201
 202         if (lvled == 0 || lvled > LM3533_LVLED_ID_MAX)
 203                 return -EINVAL;
 204
 205         if (led > LM3533_LED_ID_MAX)
 206                 return -EINVAL;
 207
 208         if (lvled < 4) {
 209                 reg = LM3533_REG_OUTPUT_CONF1;
 210                 shift = 2 * lvled;
 211         } else {
 212                 reg = LM3533_REG_OUTPUT_CONF2;
 213                 shift = 2 * (lvled - 4);
 214         }
 215
 216         mask = LM3533_LED_ID_MASK << shift;
 217         val = led << shift;
 218
 219         ret = lm3533_update(lm3533, reg, val, mask);
 220         if (ret)
 221                 dev_err(lm3533->dev, "failed to set lvled config\n");
 222
 223         return ret;
 224 }
 225
 226 static void lm3533_enable(struct lm3533 *lm3533)
 227 {
 228         if (gpio_is_valid(lm3533->gpio_hwen))
 229                 gpio_set_value(lm3533->gpio_hwen, 1);
 230 }
 231
 232 static void lm3533_disable(struct lm3533 *lm3533)
 233 {
 234         if (gpio_is_valid(lm3533->gpio_hwen))
 235                 gpio_set_value(lm3533->gpio_hwen, 0);
 236 }
 237
 238 enum lm3533_attribute_type {
 239         LM3533_ATTR_TYPE_BACKLIGHT,
 240         LM3533_ATTR_TYPE_LED,
 241 };
 242
 243 struct lm3533_device_attribute {
 244         struct device_attribute dev_attr;
 245         enum lm3533_attribute_type type;
 246         union {
 247                 struct {
 248                         u8 id;
 249                 } output;
 250         } u;
 251 };
 252
 253 #define to_lm3533_dev_attr(_attr) \
 254         container_of(_attr, struct lm3533_device_attribute, dev_attr)
 255
 256 static ssize_t show_output(struct device *dev,
 257                                 struct device_attribute *attr, char *buf)
 258 {
 259         struct lm3533 *lm3533 = dev_get_drvdata(dev);
 260         struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
 261         int id = lattr->u.output.id;
 262         u8 reg;
 263         u8 val;
 264         u8 mask;
 265         int shift;
 266         int ret;
 267
 268         if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) {
 269                 reg = LM3533_REG_OUTPUT_CONF1;
 270                 shift = id - 1;
 271                 mask = LM3533_BL_ID_MASK << shift;
 272         } else {
 273                 if (id < 4) {
 274                         reg = LM3533_REG_OUTPUT_CONF1;
 275                         shift = 2 * id;
 276                 } else {
 277                         reg = LM3533_REG_OUTPUT_CONF2;
 278                         shift = 2 * (id - 4);
 279                 }
 280                 mask = LM3533_LED_ID_MASK << shift;
 281         }
 282
 283         ret = lm3533_read(lm3533, reg, &val);
 284         if (ret)
 285                 return ret;
 286
 287         val = (val & mask) >> shift;
 288
 289         return scnprintf(buf, PAGE_SIZE, "%u\n", val);
 290 }
 291
 292 static ssize_t store_output(struct device *dev,
 293                                         struct device_attribute *attr,
 294                                         const char *buf, size_t len)
 295 {
 296         struct lm3533 *lm3533 = dev_get_drvdata(dev);
 297         struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
 298         int id = lattr->u.output.id;
 299         u8 val;
 300         int ret;
 301
 302         if (kstrtou8(buf, 0, &val))
 303                 return -EINVAL;
 304
 305         if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT)
 306                 ret = lm3533_set_hvled_config(lm3533, id, val);
 307         else
 308                 ret = lm3533_set_lvled_config(lm3533, id, val);
 309
 310         if (ret)
 311                 return ret;
 312
 313         return len;
 314 }
 315
 316 #define LM3533_OUTPUT_ATTR(_name, _mode, _show, _store, _type, _id) \
 317         struct lm3533_device_attribute lm3533_dev_attr_##_name = \
 318                 { .dev_attr     = __ATTR(_name, _mode, _show, _store), \
 319                   .type         = _type, \
 320                   .u.output     = { .id = _id }, }
 321
 322 #define LM3533_OUTPUT_ATTR_RW(_name, _type, _id) \
 323         LM3533_OUTPUT_ATTR(output_##_name, S_IRUGO | S_IWUSR, \
 324                                         show_output, store_output, _type, _id)
 325
 326 #define LM3533_OUTPUT_HVLED_ATTR_RW(_nr) \
 327         LM3533_OUTPUT_ATTR_RW(hvled##_nr, LM3533_ATTR_TYPE_BACKLIGHT, _nr)
 328 #define LM3533_OUTPUT_LVLED_ATTR_RW(_nr) \
 329         LM3533_OUTPUT_ATTR_RW(lvled##_nr, LM3533_ATTR_TYPE_LED, _nr)
 330 /*
 331  * Output config:
 332  *
 333  * output_hvled<nr>     0-1
 334  * output_lvled<nr>     0-3
 335  */
 336 static LM3533_OUTPUT_HVLED_ATTR_RW(1);
 337 static LM3533_OUTPUT_HVLED_ATTR_RW(2);
 338 static LM3533_OUTPUT_LVLED_ATTR_RW(1);
 339 static LM3533_OUTPUT_LVLED_ATTR_RW(2);
 340 static LM3533_OUTPUT_LVLED_ATTR_RW(3);
 341 static LM3533_OUTPUT_LVLED_ATTR_RW(4);
 342 static LM3533_OUTPUT_LVLED_ATTR_RW(5);
 343
 344 static struct attribute *lm3533_attributes[] = {
 345         &lm3533_dev_attr_output_hvled1.dev_attr.attr,
 346         &lm3533_dev_attr_output_hvled2.dev_attr.attr,
 347         &lm3533_dev_attr_output_lvled1.dev_attr.attr,
 348         &lm3533_dev_attr_output_lvled2.dev_attr.attr,
 349         &lm3533_dev_attr_output_lvled3.dev_attr.attr,
 350         &lm3533_dev_attr_output_lvled4.dev_attr.attr,
 351         &lm3533_dev_attr_output_lvled5.dev_attr.attr,
 352         NULL,
 353 };
 354
 355 #define to_dev_attr(_attr) \
 356         container_of(_attr, struct device_attribute, attr)
 357
 358 static umode_t lm3533_attr_is_visible(struct kobject *kobj,
 359                                              struct attribute *attr, int n)
 360 {
 361         struct device *dev = container_of(kobj, struct device, kobj);
 362         struct lm3533 *lm3533 = dev_get_drvdata(dev);
 363         struct device_attribute *dattr = to_dev_attr(attr);
 364         struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(dattr);
 365         enum lm3533_attribute_type type = lattr->type;
 366         umode_t mode = attr->mode;
 367
 368         if (!lm3533->have_backlights && type == LM3533_ATTR_TYPE_BACKLIGHT)
 369                 mode = 0;
 370         else if (!lm3533->have_leds && type == LM3533_ATTR_TYPE_LED)
 371                 mode = 0;
 372
 373         return mode;
 374 };
 375
 376 static struct attribute_group lm3533_attribute_group = {
 377         .is_visible     = lm3533_attr_is_visible,
 378         .attrs          = lm3533_attributes
 379 };
 380
 381 static int lm3533_device_als_init(struct lm3533 *lm3533)
 382 {
 383         struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
 384         int ret;
 385
 386         if (!pdata->als)
 387                 return 0;
 388
 389         lm3533_als_devs[0].platform_data = pdata->als;
 390         lm3533_als_devs[0].pdata_size = sizeof(*pdata->als);
 391
 392         ret = mfd_add_devices(lm3533->dev, 0, lm3533_als_devs, 1, NULL,
 393                               0, NULL);
 394         if (ret) {
 395                 dev_err(lm3533->dev, "failed to add ALS device\n");
 396                 return ret;
 397         }
 398
 399         lm3533->have_als = 1;
 400
 401         return 0;
 402 }
 403
 404 static int lm3533_device_bl_init(struct lm3533 *lm3533)
 405 {
 406         struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
 407         int i;
 408         int ret;
 409
 410         if (!pdata->backlights || pdata->num_backlights == 0)
 411                 return 0;
 412
 413         if (pdata->num_backlights > ARRAY_SIZE(lm3533_bl_devs))
 414                 pdata->num_backlights = ARRAY_SIZE(lm3533_bl_devs);
 415
 416         for (i = 0; i < pdata->num_backlights; ++i) {
 417                 lm3533_bl_devs[i].platform_data = &pdata->backlights[i];
 418                 lm3533_bl_devs[i].pdata_size = sizeof(pdata->backlights[i]);
 419         }
 420
 421         ret = mfd_add_devices(lm3533->dev, 0, lm3533_bl_devs,
 422                               pdata->num_backlights, NULL, 0, NULL);
 423         if (ret) {
 424                 dev_err(lm3533->dev, "failed to add backlight devices\n");
 425                 return ret;
 426         }
 427
 428         lm3533->have_backlights = 1;
 429
 430         return 0;
 431 }
 432
 433 static int lm3533_device_led_init(struct lm3533 *lm3533)
 434 {
 435         struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
 436         int i;
 437         int ret;
 438
 439         if (!pdata->leds || pdata->num_leds == 0)
 440                 return 0;
 441
 442         if (pdata->num_leds > ARRAY_SIZE(lm3533_led_devs))
 443                 pdata->num_leds = ARRAY_SIZE(lm3533_led_devs);
 444
 445         for (i = 0; i < pdata->num_leds; ++i) {
 446                 lm3533_led_devs[i].platform_data = &pdata->leds[i];
 447                 lm3533_led_devs[i].pdata_size = sizeof(pdata->leds[i]);
 448         }
 449
 450         ret = mfd_add_devices(lm3533->dev, 0, lm3533_led_devs,
 451                               pdata->num_leds, NULL, 0, NULL);
 452         if (ret) {
 453                 dev_err(lm3533->dev, "failed to add LED devices\n");
 454                 return ret;
 455         }
 456
 457         lm3533->have_leds = 1;
 458
 459         return 0;
 460 }
 461
 462 static int lm3533_device_setup(struct lm3533 *lm3533,
 463                                         struct lm3533_platform_data *pdata)
 464 {
 465         int ret;
 466
 467         ret = lm3533_set_boost_freq(lm3533, pdata->boost_freq);
 468         if (ret)
 469                 return ret;
 470
 471         return lm3533_set_boost_ovp(lm3533, pdata->boost_ovp);
 472 }
 473
 474 static int lm3533_device_init(struct lm3533 *lm3533)
 475 {
 476         struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
 477         int ret;
 478
 479         dev_dbg(lm3533->dev, "%s\n", __func__);
 480
 481         if (!pdata) {
 482                 dev_err(lm3533->dev, "no platform data\n");
 483                 return -EINVAL;
 484         }
 485
 486         lm3533->gpio_hwen = pdata->gpio_hwen;
 487
 488         dev_set_drvdata(lm3533->dev, lm3533);
 489
 490         if (gpio_is_valid(lm3533->gpio_hwen)) {
 491                 ret = devm_gpio_request_one(lm3533->dev, lm3533->gpio_hwen,
 492                                         GPIOF_OUT_INIT_LOW, "lm3533-hwen");
 493                 if (ret < 0) {
 494                         dev_err(lm3533->dev,
 495                                 "failed to request HWEN GPIO %d\n",
 496                                 lm3533->gpio_hwen);
 497                         return ret;
 498                 }
 499         }
 500
 501         lm3533_enable(lm3533);
 502
 503         ret = lm3533_device_setup(lm3533, pdata);
 504         if (ret)
 505                 goto err_disable;
 506
 507         lm3533_device_als_init(lm3533);
 508         lm3533_device_bl_init(lm3533);
 509         lm3533_device_led_init(lm3533);
 510
 511         ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group);
 512         if (ret < 0) {
 513                 dev_err(lm3533->dev, "failed to create sysfs attributes\n");
 514                 goto err_unregister;
 515         }
 516
 517         return 0;
 518
 519 err_unregister:
 520         mfd_remove_devices(lm3533->dev);
 521 err_disable:
 522         lm3533_disable(lm3533);
 523
 524         return ret;
 525 }
 526
 527 static void lm3533_device_exit(struct lm3533 *lm3533)
 528 {
 529         dev_dbg(lm3533->dev, "%s\n", __func__);
 530
 531         sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group);
 532
 533         mfd_remove_devices(lm3533->dev);
 534         lm3533_disable(lm3533);
 535 }
 536
 537 static bool lm3533_readable_register(struct device *dev, unsigned int reg)
 538 {
 539         switch (reg) {
 540         case 0x10 ... 0x2c:
 541         case 0x30 ... 0x38:
 542         case 0x40 ... 0x45:
 543         case 0x50 ... 0x57:
 544         case 0x60 ... 0x6e:
 545         case 0x70 ... 0x75:
 546         case 0x80 ... 0x85:
 547         case 0x90 ... 0x95:
 548         case 0xa0 ... 0xa5:
 549         case 0xb0 ... 0xb2:
 550                 return true;
 551         default:
 552                 return false;
 553         }
 554 }
 555
 556 static bool lm3533_volatile_register(struct device *dev, unsigned int reg)
 557 {
 558         switch (reg) {
 559         case 0x34 ... 0x36:     /* zone */
 560         case 0x37 ... 0x38:     /* adc */
 561         case 0xb0 ... 0xb1:     /* fault */
 562                 return true;
 563         default:
 564                 return false;
 565         }
 566 }
 567
 568 static bool lm3533_precious_register(struct device *dev, unsigned int reg)
 569 {
 570         switch (reg) {
 571         case 0x34:              /* zone */
 572                 return true;
 573         default:
 574                 return false;
 575         }
 576 }
 577
 578 static const struct regmap_config regmap_config = {
 579         .reg_bits       = 8,
 580         .val_bits       = 8,
 581         .max_register   = LM3533_REG_MAX,
 582         .readable_reg   = lm3533_readable_register,
 583         .volatile_reg   = lm3533_volatile_register,
 584         .precious_reg   = lm3533_precious_register,
 585 };
 586
 587 static int lm3533_i2c_probe(struct i2c_client *i2c,
 588                                         const struct i2c_device_id *id)
 589 {
 590         struct lm3533 *lm3533;
 591
 592         dev_dbg(&i2c->dev, "%s\n", __func__);
 593
 594         lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL);
 595         if (!lm3533)
 596                 return -ENOMEM;
 597
 598         i2c_set_clientdata(i2c, lm3533);
 599
 600         lm3533->regmap = devm_regmap_init_i2c(i2c, &regmap_config);
 601         if (IS_ERR(lm3533->regmap))
 602                 return PTR_ERR(lm3533->regmap);
 603
 604         lm3533->dev = &i2c->dev;
 605         lm3533->irq = i2c->irq;
 606
 607         return lm3533_device_init(lm3533);
 608 }
 609
 610 static int lm3533_i2c_remove(struct i2c_client *i2c)
 611 {
 612         struct lm3533 *lm3533 = i2c_get_clientdata(i2c);
 613
 614         dev_dbg(&i2c->dev, "%s\n", __func__);
 615
 616         lm3533_device_exit(lm3533);
 617
 618         return 0;
 619 }
 620
 621 static const struct i2c_device_id lm3533_i2c_ids[] = {
 622         { "lm3533", 0 },
 623         { },
 624 };
 625 MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids);
 626
 627 static struct i2c_driver lm3533_i2c_driver = {
 628         .driver = {
 629                    .name = "lm3533",
 630         },
 631         .id_table       = lm3533_i2c_ids,
 632         .probe          = lm3533_i2c_probe,
 633         .remove         = lm3533_i2c_remove,
 634 };
 635
 636 static int __init lm3533_i2c_init(void)
 637 {
 638         return i2c_add_driver(&lm3533_i2c_driver);
 639 }
 640 subsys_initcall(lm3533_i2c_init);
 641
 642 static void __exit lm3533_i2c_exit(void)
 643 {
 644         i2c_del_driver(&lm3533_i2c_driver);
 645 }
 646 module_exit(lm3533_i2c_exit);
 647
 648 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 649 MODULE_DESCRIPTION("LM3533 Core");
 650 MODULE_LICENSE("GPL");