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 sysfs_emit(buf, "%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 = kobj_to_dev(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 if (gpio_is_valid(lm3533->gpio_hwen)) { 489 ret = devm_gpio_request_one(lm3533->dev, lm3533->gpio_hwen, 490 GPIOF_OUT_INIT_LOW, "lm3533-hwen"); 491 if (ret < 0) { 492 dev_err(lm3533->dev, 493 "failed to request HWEN GPIO %d\n", 494 lm3533->gpio_hwen); 495 return ret; 496 } 497 } 498 499 lm3533_enable(lm3533); 500 501 ret = lm3533_device_setup(lm3533, pdata); 502 if (ret) 503 goto err_disable; 504 505 lm3533_device_als_init(lm3533); 506 lm3533_device_bl_init(lm3533); 507 lm3533_device_led_init(lm3533); 508 509 ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group); 510 if (ret < 0) { 511 dev_err(lm3533->dev, "failed to create sysfs attributes\n"); 512 goto err_unregister; 513 } 514 515 return 0; 516 517 err_unregister: 518 mfd_remove_devices(lm3533->dev); 519 err_disable: 520 lm3533_disable(lm3533); 521 522 return ret; 523 } 524 525 static void lm3533_device_exit(struct lm3533 *lm3533) 526 { 527 dev_dbg(lm3533->dev, "%s\n", __func__); 528 529 sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group); 530 531 mfd_remove_devices(lm3533->dev); 532 lm3533_disable(lm3533); 533 } 534 535 static bool lm3533_readable_register(struct device *dev, unsigned int reg) 536 { 537 switch (reg) { 538 case 0x10 ... 0x2c: 539 case 0x30 ... 0x38: 540 case 0x40 ... 0x45: 541 case 0x50 ... 0x57: 542 case 0x60 ... 0x6e: 543 case 0x70 ... 0x75: 544 case 0x80 ... 0x85: 545 case 0x90 ... 0x95: 546 case 0xa0 ... 0xa5: 547 case 0xb0 ... 0xb2: 548 return true; 549 default: 550 return false; 551 } 552 } 553 554 static bool lm3533_volatile_register(struct device *dev, unsigned int reg) 555 { 556 switch (reg) { 557 case 0x34 ... 0x36: /* zone */ 558 case 0x37 ... 0x38: /* adc */ 559 case 0xb0 ... 0xb1: /* fault */ 560 return true; 561 default: 562 return false; 563 } 564 } 565 566 static bool lm3533_precious_register(struct device *dev, unsigned int reg) 567 { 568 switch (reg) { 569 case 0x34: /* zone */ 570 return true; 571 default: 572 return false; 573 } 574 } 575 576 static const struct regmap_config regmap_config = { 577 .reg_bits = 8, 578 .val_bits = 8, 579 .max_register = LM3533_REG_MAX, 580 .readable_reg = lm3533_readable_register, 581 .volatile_reg = lm3533_volatile_register, 582 .precious_reg = lm3533_precious_register, 583 }; 584 585 static int lm3533_i2c_probe(struct i2c_client *i2c) 586 { 587 struct lm3533 *lm3533; 588 589 dev_dbg(&i2c->dev, "%s\n", __func__); 590 591 lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL); 592 if (!lm3533) 593 return -ENOMEM; 594 595 i2c_set_clientdata(i2c, lm3533); 596 597 lm3533->regmap = devm_regmap_init_i2c(i2c, ®map_config); 598 if (IS_ERR(lm3533->regmap)) 599 return PTR_ERR(lm3533->regmap); 600 601 lm3533->dev = &i2c->dev; 602 lm3533->irq = i2c->irq; 603 604 return lm3533_device_init(lm3533); 605 } 606 607 static void lm3533_i2c_remove(struct i2c_client *i2c) 608 { 609 struct lm3533 *lm3533 = i2c_get_clientdata(i2c); 610 611 dev_dbg(&i2c->dev, "%s\n", __func__); 612 613 lm3533_device_exit(lm3533); 614 } 615 616 static const struct i2c_device_id lm3533_i2c_ids[] = { 617 { "lm3533", 0 }, 618 { }, 619 }; 620 MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids); 621 622 static struct i2c_driver lm3533_i2c_driver = { 623 .driver = { 624 .name = "lm3533", 625 }, 626 .id_table = lm3533_i2c_ids, 627 .probe = lm3533_i2c_probe, 628 .remove = lm3533_i2c_remove, 629 }; 630 631 static int __init lm3533_i2c_init(void) 632 { 633 return i2c_add_driver(&lm3533_i2c_driver); 634 } 635 subsys_initcall(lm3533_i2c_init); 636 637 static void __exit lm3533_i2c_exit(void) 638 { 639 i2c_del_driver(&lm3533_i2c_driver); 640 } 641 module_exit(lm3533_i2c_exit); 642 643 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); 644 MODULE_DESCRIPTION("LM3533 Core"); 645 MODULE_LICENSE("GPL"); 646