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/consumer.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 gpiod_set_value(lm3533->hwen, 1); 229 } 230 231 static void lm3533_disable(struct lm3533 *lm3533) 232 { 233 gpiod_set_value(lm3533->hwen, 0); 234 } 235 236 enum lm3533_attribute_type { 237 LM3533_ATTR_TYPE_BACKLIGHT, 238 LM3533_ATTR_TYPE_LED, 239 }; 240 241 struct lm3533_device_attribute { 242 struct device_attribute dev_attr; 243 enum lm3533_attribute_type type; 244 union { 245 struct { 246 u8 id; 247 } output; 248 } u; 249 }; 250 251 #define to_lm3533_dev_attr(_attr) \ 252 container_of(_attr, struct lm3533_device_attribute, dev_attr) 253 254 static ssize_t show_output(struct device *dev, 255 struct device_attribute *attr, char *buf) 256 { 257 struct lm3533 *lm3533 = dev_get_drvdata(dev); 258 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr); 259 int id = lattr->u.output.id; 260 u8 reg; 261 u8 val; 262 u8 mask; 263 int shift; 264 int ret; 265 266 if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) { 267 reg = LM3533_REG_OUTPUT_CONF1; 268 shift = id - 1; 269 mask = LM3533_BL_ID_MASK << shift; 270 } else { 271 if (id < 4) { 272 reg = LM3533_REG_OUTPUT_CONF1; 273 shift = 2 * id; 274 } else { 275 reg = LM3533_REG_OUTPUT_CONF2; 276 shift = 2 * (id - 4); 277 } 278 mask = LM3533_LED_ID_MASK << shift; 279 } 280 281 ret = lm3533_read(lm3533, reg, &val); 282 if (ret) 283 return ret; 284 285 val = (val & mask) >> shift; 286 287 return sysfs_emit(buf, "%u\n", val); 288 } 289 290 static ssize_t store_output(struct device *dev, 291 struct device_attribute *attr, 292 const char *buf, size_t len) 293 { 294 struct lm3533 *lm3533 = dev_get_drvdata(dev); 295 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr); 296 int id = lattr->u.output.id; 297 u8 val; 298 int ret; 299 300 if (kstrtou8(buf, 0, &val)) 301 return -EINVAL; 302 303 if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) 304 ret = lm3533_set_hvled_config(lm3533, id, val); 305 else 306 ret = lm3533_set_lvled_config(lm3533, id, val); 307 308 if (ret) 309 return ret; 310 311 return len; 312 } 313 314 #define LM3533_OUTPUT_ATTR(_name, _mode, _show, _store, _type, _id) \ 315 struct lm3533_device_attribute lm3533_dev_attr_##_name = \ 316 { .dev_attr = __ATTR(_name, _mode, _show, _store), \ 317 .type = _type, \ 318 .u.output = { .id = _id }, } 319 320 #define LM3533_OUTPUT_ATTR_RW(_name, _type, _id) \ 321 LM3533_OUTPUT_ATTR(output_##_name, S_IRUGO | S_IWUSR, \ 322 show_output, store_output, _type, _id) 323 324 #define LM3533_OUTPUT_HVLED_ATTR_RW(_nr) \ 325 LM3533_OUTPUT_ATTR_RW(hvled##_nr, LM3533_ATTR_TYPE_BACKLIGHT, _nr) 326 #define LM3533_OUTPUT_LVLED_ATTR_RW(_nr) \ 327 LM3533_OUTPUT_ATTR_RW(lvled##_nr, LM3533_ATTR_TYPE_LED, _nr) 328 /* 329 * Output config: 330 * 331 * output_hvled<nr> 0-1 332 * output_lvled<nr> 0-3 333 */ 334 static LM3533_OUTPUT_HVLED_ATTR_RW(1); 335 static LM3533_OUTPUT_HVLED_ATTR_RW(2); 336 static LM3533_OUTPUT_LVLED_ATTR_RW(1); 337 static LM3533_OUTPUT_LVLED_ATTR_RW(2); 338 static LM3533_OUTPUT_LVLED_ATTR_RW(3); 339 static LM3533_OUTPUT_LVLED_ATTR_RW(4); 340 static LM3533_OUTPUT_LVLED_ATTR_RW(5); 341 342 static struct attribute *lm3533_attributes[] = { 343 &lm3533_dev_attr_output_hvled1.dev_attr.attr, 344 &lm3533_dev_attr_output_hvled2.dev_attr.attr, 345 &lm3533_dev_attr_output_lvled1.dev_attr.attr, 346 &lm3533_dev_attr_output_lvled2.dev_attr.attr, 347 &lm3533_dev_attr_output_lvled3.dev_attr.attr, 348 &lm3533_dev_attr_output_lvled4.dev_attr.attr, 349 &lm3533_dev_attr_output_lvled5.dev_attr.attr, 350 NULL, 351 }; 352 353 #define to_dev_attr(_attr) \ 354 container_of(_attr, struct device_attribute, attr) 355 356 static umode_t lm3533_attr_is_visible(struct kobject *kobj, 357 struct attribute *attr, int n) 358 { 359 struct device *dev = kobj_to_dev(kobj); 360 struct lm3533 *lm3533 = dev_get_drvdata(dev); 361 struct device_attribute *dattr = to_dev_attr(attr); 362 struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(dattr); 363 enum lm3533_attribute_type type = lattr->type; 364 umode_t mode = attr->mode; 365 366 if (!lm3533->have_backlights && type == LM3533_ATTR_TYPE_BACKLIGHT) 367 mode = 0; 368 else if (!lm3533->have_leds && type == LM3533_ATTR_TYPE_LED) 369 mode = 0; 370 371 return mode; 372 }; 373 374 static struct attribute_group lm3533_attribute_group = { 375 .is_visible = lm3533_attr_is_visible, 376 .attrs = lm3533_attributes 377 }; 378 379 static int lm3533_device_als_init(struct lm3533 *lm3533) 380 { 381 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); 382 int ret; 383 384 if (!pdata->als) 385 return 0; 386 387 lm3533_als_devs[0].platform_data = pdata->als; 388 lm3533_als_devs[0].pdata_size = sizeof(*pdata->als); 389 390 ret = mfd_add_devices(lm3533->dev, 0, lm3533_als_devs, 1, NULL, 391 0, NULL); 392 if (ret) { 393 dev_err(lm3533->dev, "failed to add ALS device\n"); 394 return ret; 395 } 396 397 lm3533->have_als = 1; 398 399 return 0; 400 } 401 402 static int lm3533_device_bl_init(struct lm3533 *lm3533) 403 { 404 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); 405 int i; 406 int ret; 407 408 if (!pdata->backlights || pdata->num_backlights == 0) 409 return 0; 410 411 if (pdata->num_backlights > ARRAY_SIZE(lm3533_bl_devs)) 412 pdata->num_backlights = ARRAY_SIZE(lm3533_bl_devs); 413 414 for (i = 0; i < pdata->num_backlights; ++i) { 415 lm3533_bl_devs[i].platform_data = &pdata->backlights[i]; 416 lm3533_bl_devs[i].pdata_size = sizeof(pdata->backlights[i]); 417 } 418 419 ret = mfd_add_devices(lm3533->dev, 0, lm3533_bl_devs, 420 pdata->num_backlights, NULL, 0, NULL); 421 if (ret) { 422 dev_err(lm3533->dev, "failed to add backlight devices\n"); 423 return ret; 424 } 425 426 lm3533->have_backlights = 1; 427 428 return 0; 429 } 430 431 static int lm3533_device_led_init(struct lm3533 *lm3533) 432 { 433 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); 434 int i; 435 int ret; 436 437 if (!pdata->leds || pdata->num_leds == 0) 438 return 0; 439 440 if (pdata->num_leds > ARRAY_SIZE(lm3533_led_devs)) 441 pdata->num_leds = ARRAY_SIZE(lm3533_led_devs); 442 443 for (i = 0; i < pdata->num_leds; ++i) { 444 lm3533_led_devs[i].platform_data = &pdata->leds[i]; 445 lm3533_led_devs[i].pdata_size = sizeof(pdata->leds[i]); 446 } 447 448 ret = mfd_add_devices(lm3533->dev, 0, lm3533_led_devs, 449 pdata->num_leds, NULL, 0, NULL); 450 if (ret) { 451 dev_err(lm3533->dev, "failed to add LED devices\n"); 452 return ret; 453 } 454 455 lm3533->have_leds = 1; 456 457 return 0; 458 } 459 460 static int lm3533_device_setup(struct lm3533 *lm3533, 461 struct lm3533_platform_data *pdata) 462 { 463 int ret; 464 465 ret = lm3533_set_boost_freq(lm3533, pdata->boost_freq); 466 if (ret) 467 return ret; 468 469 return lm3533_set_boost_ovp(lm3533, pdata->boost_ovp); 470 } 471 472 static int lm3533_device_init(struct lm3533 *lm3533) 473 { 474 struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev); 475 int ret; 476 477 dev_dbg(lm3533->dev, "%s\n", __func__); 478 479 if (!pdata) { 480 dev_err(lm3533->dev, "no platform data\n"); 481 return -EINVAL; 482 } 483 484 lm3533->hwen = devm_gpiod_get(lm3533->dev, NULL, GPIOD_OUT_LOW); 485 if (IS_ERR(lm3533->hwen)) 486 return dev_err_probe(lm3533->dev, PTR_ERR(lm3533->hwen), "failed to request HWEN GPIO\n"); 487 gpiod_set_consumer_name(lm3533->hwen, "lm3533-hwen"); 488 489 lm3533_enable(lm3533); 490 491 ret = lm3533_device_setup(lm3533, pdata); 492 if (ret) 493 goto err_disable; 494 495 lm3533_device_als_init(lm3533); 496 lm3533_device_bl_init(lm3533); 497 lm3533_device_led_init(lm3533); 498 499 ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group); 500 if (ret < 0) { 501 dev_err(lm3533->dev, "failed to create sysfs attributes\n"); 502 goto err_unregister; 503 } 504 505 return 0; 506 507 err_unregister: 508 mfd_remove_devices(lm3533->dev); 509 err_disable: 510 lm3533_disable(lm3533); 511 512 return ret; 513 } 514 515 static void lm3533_device_exit(struct lm3533 *lm3533) 516 { 517 dev_dbg(lm3533->dev, "%s\n", __func__); 518 519 sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group); 520 521 mfd_remove_devices(lm3533->dev); 522 lm3533_disable(lm3533); 523 } 524 525 static bool lm3533_readable_register(struct device *dev, unsigned int reg) 526 { 527 switch (reg) { 528 case 0x10 ... 0x2c: 529 case 0x30 ... 0x38: 530 case 0x40 ... 0x45: 531 case 0x50 ... 0x57: 532 case 0x60 ... 0x6e: 533 case 0x70 ... 0x75: 534 case 0x80 ... 0x85: 535 case 0x90 ... 0x95: 536 case 0xa0 ... 0xa5: 537 case 0xb0 ... 0xb2: 538 return true; 539 default: 540 return false; 541 } 542 } 543 544 static bool lm3533_volatile_register(struct device *dev, unsigned int reg) 545 { 546 switch (reg) { 547 case 0x34 ... 0x36: /* zone */ 548 case 0x37 ... 0x38: /* adc */ 549 case 0xb0 ... 0xb1: /* fault */ 550 return true; 551 default: 552 return false; 553 } 554 } 555 556 static bool lm3533_precious_register(struct device *dev, unsigned int reg) 557 { 558 switch (reg) { 559 case 0x34: /* zone */ 560 return true; 561 default: 562 return false; 563 } 564 } 565 566 static const struct regmap_config regmap_config = { 567 .reg_bits = 8, 568 .val_bits = 8, 569 .max_register = LM3533_REG_MAX, 570 .readable_reg = lm3533_readable_register, 571 .volatile_reg = lm3533_volatile_register, 572 .precious_reg = lm3533_precious_register, 573 }; 574 575 static int lm3533_i2c_probe(struct i2c_client *i2c) 576 { 577 struct lm3533 *lm3533; 578 579 dev_dbg(&i2c->dev, "%s\n", __func__); 580 581 lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL); 582 if (!lm3533) 583 return -ENOMEM; 584 585 i2c_set_clientdata(i2c, lm3533); 586 587 lm3533->regmap = devm_regmap_init_i2c(i2c, ®map_config); 588 if (IS_ERR(lm3533->regmap)) 589 return PTR_ERR(lm3533->regmap); 590 591 lm3533->dev = &i2c->dev; 592 lm3533->irq = i2c->irq; 593 594 return lm3533_device_init(lm3533); 595 } 596 597 static void lm3533_i2c_remove(struct i2c_client *i2c) 598 { 599 struct lm3533 *lm3533 = i2c_get_clientdata(i2c); 600 601 dev_dbg(&i2c->dev, "%s\n", __func__); 602 603 lm3533_device_exit(lm3533); 604 } 605 606 static const struct i2c_device_id lm3533_i2c_ids[] = { 607 { "lm3533" }, 608 { } 609 }; 610 MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids); 611 612 static struct i2c_driver lm3533_i2c_driver = { 613 .driver = { 614 .name = "lm3533", 615 }, 616 .id_table = lm3533_i2c_ids, 617 .probe = lm3533_i2c_probe, 618 .remove = lm3533_i2c_remove, 619 }; 620 621 static int __init lm3533_i2c_init(void) 622 { 623 return i2c_add_driver(&lm3533_i2c_driver); 624 } 625 subsys_initcall(lm3533_i2c_init); 626 627 static void __exit lm3533_i2c_exit(void) 628 { 629 i2c_del_driver(&lm3533_i2c_driver); 630 } 631 module_exit(lm3533_i2c_exit); 632 633 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); 634 MODULE_DESCRIPTION("LM3533 Core"); 635 MODULE_LICENSE("GPL"); 636