1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * LP5521/LP5523/LP55231/LP5562 Common Driver 4 * 5 * Copyright 2012 Texas Instruments 6 * 7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com> 8 * 9 * Derived from leds-lp5521.c, leds-lp5523.c 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/delay.h> 14 #include <linux/firmware.h> 15 #include <linux/i2c.h> 16 #include <linux/leds.h> 17 #include <linux/module.h> 18 #include <linux/platform_data/leds-lp55xx.h> 19 #include <linux/slab.h> 20 #include <linux/gpio/consumer.h> 21 #include <dt-bindings/leds/leds-lp55xx.h> 22 23 #include "leds-lp55xx-common.h" 24 25 /* External clock rate */ 26 #define LP55XX_CLK_32K 32768 27 28 static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev) 29 { 30 return container_of(cdev, struct lp55xx_led, cdev); 31 } 32 33 static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev) 34 { 35 return cdev_to_lp55xx_led(dev_get_drvdata(dev)); 36 } 37 38 static struct lp55xx_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev) 39 { 40 return container_of(mc_cdev, struct lp55xx_led, mc_cdev); 41 } 42 43 static void lp55xx_reset_device(struct lp55xx_chip *chip) 44 { 45 struct lp55xx_device_config *cfg = chip->cfg; 46 u8 addr = cfg->reset.addr; 47 u8 val = cfg->reset.val; 48 49 /* no error checking here because no ACK from the device after reset */ 50 lp55xx_write(chip, addr, val); 51 } 52 53 static int lp55xx_detect_device(struct lp55xx_chip *chip) 54 { 55 struct lp55xx_device_config *cfg = chip->cfg; 56 u8 addr = cfg->enable.addr; 57 u8 val = cfg->enable.val; 58 int ret; 59 60 ret = lp55xx_write(chip, addr, val); 61 if (ret) 62 return ret; 63 64 usleep_range(1000, 2000); 65 66 ret = lp55xx_read(chip, addr, &val); 67 if (ret) 68 return ret; 69 70 if (val != cfg->enable.val) 71 return -ENODEV; 72 73 return 0; 74 } 75 76 static int lp55xx_post_init_device(struct lp55xx_chip *chip) 77 { 78 struct lp55xx_device_config *cfg = chip->cfg; 79 80 if (!cfg->post_init_device) 81 return 0; 82 83 return cfg->post_init_device(chip); 84 } 85 86 static ssize_t led_current_show(struct device *dev, 87 struct device_attribute *attr, 88 char *buf) 89 { 90 struct lp55xx_led *led = dev_to_lp55xx_led(dev); 91 92 return sysfs_emit(buf, "%d\n", led->led_current); 93 } 94 95 static ssize_t led_current_store(struct device *dev, 96 struct device_attribute *attr, 97 const char *buf, size_t len) 98 { 99 struct lp55xx_led *led = dev_to_lp55xx_led(dev); 100 struct lp55xx_chip *chip = led->chip; 101 unsigned long curr; 102 103 if (kstrtoul(buf, 0, &curr)) 104 return -EINVAL; 105 106 if (curr > led->max_current) 107 return -EINVAL; 108 109 if (!chip->cfg->set_led_current) 110 return len; 111 112 mutex_lock(&chip->lock); 113 chip->cfg->set_led_current(led, (u8)curr); 114 mutex_unlock(&chip->lock); 115 116 return len; 117 } 118 119 static ssize_t max_current_show(struct device *dev, 120 struct device_attribute *attr, 121 char *buf) 122 { 123 struct lp55xx_led *led = dev_to_lp55xx_led(dev); 124 125 return sysfs_emit(buf, "%d\n", led->max_current); 126 } 127 128 static DEVICE_ATTR_RW(led_current); 129 static DEVICE_ATTR_RO(max_current); 130 131 static struct attribute *lp55xx_led_attrs[] = { 132 &dev_attr_led_current.attr, 133 &dev_attr_max_current.attr, 134 NULL, 135 }; 136 ATTRIBUTE_GROUPS(lp55xx_led); 137 138 static int lp55xx_set_mc_brightness(struct led_classdev *cdev, 139 enum led_brightness brightness) 140 { 141 struct led_classdev_mc *mc_dev = lcdev_to_mccdev(cdev); 142 struct lp55xx_led *led = mcled_cdev_to_led(mc_dev); 143 struct lp55xx_device_config *cfg = led->chip->cfg; 144 145 led_mc_calc_color_components(&led->mc_cdev, brightness); 146 return cfg->multicolor_brightness_fn(led); 147 148 } 149 150 static int lp55xx_set_brightness(struct led_classdev *cdev, 151 enum led_brightness brightness) 152 { 153 struct lp55xx_led *led = cdev_to_lp55xx_led(cdev); 154 struct lp55xx_device_config *cfg = led->chip->cfg; 155 156 led->brightness = (u8)brightness; 157 return cfg->brightness_fn(led); 158 } 159 160 static int lp55xx_init_led(struct lp55xx_led *led, 161 struct lp55xx_chip *chip, int chan) 162 { 163 struct lp55xx_platform_data *pdata = chip->pdata; 164 struct lp55xx_device_config *cfg = chip->cfg; 165 struct device *dev = &chip->cl->dev; 166 int max_channel = cfg->max_channel; 167 struct mc_subled *mc_led_info; 168 struct led_classdev *led_cdev; 169 char name[32]; 170 int i; 171 int ret; 172 173 if (chan >= max_channel) { 174 dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel); 175 return -EINVAL; 176 } 177 178 if (pdata->led_config[chan].led_current == 0) 179 return 0; 180 181 if (pdata->led_config[chan].name) { 182 led->cdev.name = pdata->led_config[chan].name; 183 } else { 184 snprintf(name, sizeof(name), "%s:channel%d", 185 pdata->label ? : chip->cl->name, chan); 186 led->cdev.name = name; 187 } 188 189 if (pdata->led_config[chan].num_colors > 1) { 190 mc_led_info = devm_kcalloc(dev, 191 pdata->led_config[chan].num_colors, 192 sizeof(*mc_led_info), GFP_KERNEL); 193 if (!mc_led_info) 194 return -ENOMEM; 195 196 led_cdev = &led->mc_cdev.led_cdev; 197 led_cdev->name = led->cdev.name; 198 led_cdev->brightness_set_blocking = lp55xx_set_mc_brightness; 199 led->mc_cdev.num_colors = pdata->led_config[chan].num_colors; 200 for (i = 0; i < led->mc_cdev.num_colors; i++) { 201 mc_led_info[i].color_index = 202 pdata->led_config[chan].color_id[i]; 203 mc_led_info[i].channel = 204 pdata->led_config[chan].output_num[i]; 205 } 206 207 led->mc_cdev.subled_info = mc_led_info; 208 } else { 209 led->cdev.brightness_set_blocking = lp55xx_set_brightness; 210 } 211 212 led->cdev.groups = lp55xx_led_groups; 213 led->cdev.default_trigger = pdata->led_config[chan].default_trigger; 214 led->led_current = pdata->led_config[chan].led_current; 215 led->max_current = pdata->led_config[chan].max_current; 216 led->chan_nr = pdata->led_config[chan].chan_nr; 217 218 if (led->chan_nr >= max_channel) { 219 dev_err(dev, "Use channel numbers between 0 and %d\n", 220 max_channel - 1); 221 return -EINVAL; 222 } 223 224 if (pdata->led_config[chan].num_colors > 1) 225 ret = devm_led_classdev_multicolor_register(dev, &led->mc_cdev); 226 else 227 ret = devm_led_classdev_register(dev, &led->cdev); 228 229 if (ret) { 230 dev_err(dev, "led register err: %d\n", ret); 231 return ret; 232 } 233 234 return 0; 235 } 236 237 static void lp55xx_firmware_loaded(const struct firmware *fw, void *context) 238 { 239 struct lp55xx_chip *chip = context; 240 struct device *dev = &chip->cl->dev; 241 enum lp55xx_engine_index idx = chip->engine_idx; 242 243 if (!fw) { 244 dev_err(dev, "firmware request failed\n"); 245 return; 246 } 247 248 /* handling firmware data is chip dependent */ 249 mutex_lock(&chip->lock); 250 251 chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD; 252 chip->fw = fw; 253 if (chip->cfg->firmware_cb) 254 chip->cfg->firmware_cb(chip); 255 256 mutex_unlock(&chip->lock); 257 258 /* firmware should be released for other channel use */ 259 release_firmware(chip->fw); 260 chip->fw = NULL; 261 } 262 263 static int lp55xx_request_firmware(struct lp55xx_chip *chip) 264 { 265 const char *name = chip->cl->name; 266 struct device *dev = &chip->cl->dev; 267 268 return request_firmware_nowait(THIS_MODULE, false, name, dev, 269 GFP_KERNEL, chip, lp55xx_firmware_loaded); 270 } 271 272 static ssize_t select_engine_show(struct device *dev, 273 struct device_attribute *attr, 274 char *buf) 275 { 276 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 277 struct lp55xx_chip *chip = led->chip; 278 279 return sprintf(buf, "%d\n", chip->engine_idx); 280 } 281 282 static ssize_t select_engine_store(struct device *dev, 283 struct device_attribute *attr, 284 const char *buf, size_t len) 285 { 286 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 287 struct lp55xx_chip *chip = led->chip; 288 unsigned long val; 289 int ret; 290 291 if (kstrtoul(buf, 0, &val)) 292 return -EINVAL; 293 294 /* select the engine to be run */ 295 296 switch (val) { 297 case LP55XX_ENGINE_1: 298 case LP55XX_ENGINE_2: 299 case LP55XX_ENGINE_3: 300 mutex_lock(&chip->lock); 301 chip->engine_idx = val; 302 ret = lp55xx_request_firmware(chip); 303 mutex_unlock(&chip->lock); 304 break; 305 default: 306 dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val); 307 return -EINVAL; 308 } 309 310 if (ret) { 311 dev_err(dev, "request firmware err: %d\n", ret); 312 return ret; 313 } 314 315 return len; 316 } 317 318 static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start) 319 { 320 if (chip->cfg->run_engine) 321 chip->cfg->run_engine(chip, start); 322 } 323 324 static ssize_t run_engine_store(struct device *dev, 325 struct device_attribute *attr, 326 const char *buf, size_t len) 327 { 328 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 329 struct lp55xx_chip *chip = led->chip; 330 unsigned long val; 331 332 if (kstrtoul(buf, 0, &val)) 333 return -EINVAL; 334 335 /* run or stop the selected engine */ 336 337 if (val <= 0) { 338 lp55xx_run_engine(chip, false); 339 return len; 340 } 341 342 mutex_lock(&chip->lock); 343 lp55xx_run_engine(chip, true); 344 mutex_unlock(&chip->lock); 345 346 return len; 347 } 348 349 static DEVICE_ATTR_RW(select_engine); 350 static DEVICE_ATTR_WO(run_engine); 351 352 static struct attribute *lp55xx_engine_attributes[] = { 353 &dev_attr_select_engine.attr, 354 &dev_attr_run_engine.attr, 355 NULL, 356 }; 357 358 static const struct attribute_group lp55xx_engine_attr_group = { 359 .attrs = lp55xx_engine_attributes, 360 }; 361 362 int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val) 363 { 364 return i2c_smbus_write_byte_data(chip->cl, reg, val); 365 } 366 EXPORT_SYMBOL_GPL(lp55xx_write); 367 368 int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val) 369 { 370 s32 ret; 371 372 ret = i2c_smbus_read_byte_data(chip->cl, reg); 373 if (ret < 0) 374 return ret; 375 376 *val = ret; 377 return 0; 378 } 379 EXPORT_SYMBOL_GPL(lp55xx_read); 380 381 int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val) 382 { 383 int ret; 384 u8 tmp; 385 386 ret = lp55xx_read(chip, reg, &tmp); 387 if (ret) 388 return ret; 389 390 tmp &= ~mask; 391 tmp |= val & mask; 392 393 return lp55xx_write(chip, reg, tmp); 394 } 395 EXPORT_SYMBOL_GPL(lp55xx_update_bits); 396 397 bool lp55xx_is_extclk_used(struct lp55xx_chip *chip) 398 { 399 struct clk *clk; 400 int err; 401 402 clk = devm_clk_get(&chip->cl->dev, "32k_clk"); 403 if (IS_ERR(clk)) 404 goto use_internal_clk; 405 406 err = clk_prepare_enable(clk); 407 if (err) 408 goto use_internal_clk; 409 410 if (clk_get_rate(clk) != LP55XX_CLK_32K) { 411 clk_disable_unprepare(clk); 412 goto use_internal_clk; 413 } 414 415 dev_info(&chip->cl->dev, "%dHz external clock used\n", LP55XX_CLK_32K); 416 417 chip->clk = clk; 418 return true; 419 420 use_internal_clk: 421 dev_info(&chip->cl->dev, "internal clock used\n"); 422 return false; 423 } 424 EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used); 425 426 int lp55xx_init_device(struct lp55xx_chip *chip) 427 { 428 struct lp55xx_platform_data *pdata; 429 struct lp55xx_device_config *cfg; 430 struct device *dev = &chip->cl->dev; 431 int ret = 0; 432 433 WARN_ON(!chip); 434 435 pdata = chip->pdata; 436 cfg = chip->cfg; 437 438 if (!pdata || !cfg) 439 return -EINVAL; 440 441 if (pdata->enable_gpiod) { 442 gpiod_direction_output(pdata->enable_gpiod, 0); 443 444 gpiod_set_consumer_name(pdata->enable_gpiod, "LP55xx enable"); 445 gpiod_set_value(pdata->enable_gpiod, 0); 446 usleep_range(1000, 2000); /* Keep enable down at least 1ms */ 447 gpiod_set_value(pdata->enable_gpiod, 1); 448 usleep_range(1000, 2000); /* 500us abs min. */ 449 } 450 451 lp55xx_reset_device(chip); 452 453 /* 454 * Exact value is not available. 10 - 20ms 455 * appears to be enough for reset. 456 */ 457 usleep_range(10000, 20000); 458 459 ret = lp55xx_detect_device(chip); 460 if (ret) { 461 dev_err(dev, "device detection err: %d\n", ret); 462 goto err; 463 } 464 465 /* chip specific initialization */ 466 ret = lp55xx_post_init_device(chip); 467 if (ret) { 468 dev_err(dev, "post init device err: %d\n", ret); 469 goto err_post_init; 470 } 471 472 return 0; 473 474 err_post_init: 475 lp55xx_deinit_device(chip); 476 err: 477 return ret; 478 } 479 EXPORT_SYMBOL_GPL(lp55xx_init_device); 480 481 void lp55xx_deinit_device(struct lp55xx_chip *chip) 482 { 483 struct lp55xx_platform_data *pdata = chip->pdata; 484 485 if (chip->clk) 486 clk_disable_unprepare(chip->clk); 487 488 if (pdata->enable_gpiod) 489 gpiod_set_value(pdata->enable_gpiod, 0); 490 } 491 EXPORT_SYMBOL_GPL(lp55xx_deinit_device); 492 493 int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip) 494 { 495 struct lp55xx_platform_data *pdata = chip->pdata; 496 struct lp55xx_device_config *cfg = chip->cfg; 497 int num_channels = pdata->num_channels; 498 struct lp55xx_led *each; 499 u8 led_current; 500 int ret; 501 int i; 502 503 if (!cfg->brightness_fn) { 504 dev_err(&chip->cl->dev, "empty brightness configuration\n"); 505 return -EINVAL; 506 } 507 508 for (i = 0; i < num_channels; i++) { 509 510 /* do not initialize channels that are not connected */ 511 if (pdata->led_config[i].led_current == 0) 512 continue; 513 514 led_current = pdata->led_config[i].led_current; 515 each = led + i; 516 ret = lp55xx_init_led(each, chip, i); 517 if (ret) 518 goto err_init_led; 519 520 chip->num_leds++; 521 each->chip = chip; 522 523 /* setting led current at each channel */ 524 if (cfg->set_led_current) 525 cfg->set_led_current(each, led_current); 526 } 527 528 return 0; 529 530 err_init_led: 531 return ret; 532 } 533 EXPORT_SYMBOL_GPL(lp55xx_register_leds); 534 535 int lp55xx_register_sysfs(struct lp55xx_chip *chip) 536 { 537 struct device *dev = &chip->cl->dev; 538 struct lp55xx_device_config *cfg = chip->cfg; 539 int ret; 540 541 if (!cfg->run_engine || !cfg->firmware_cb) 542 goto dev_specific_attrs; 543 544 ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group); 545 if (ret) 546 return ret; 547 548 dev_specific_attrs: 549 return cfg->dev_attr_group ? 550 sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0; 551 } 552 EXPORT_SYMBOL_GPL(lp55xx_register_sysfs); 553 554 void lp55xx_unregister_sysfs(struct lp55xx_chip *chip) 555 { 556 struct device *dev = &chip->cl->dev; 557 struct lp55xx_device_config *cfg = chip->cfg; 558 559 if (cfg->dev_attr_group) 560 sysfs_remove_group(&dev->kobj, cfg->dev_attr_group); 561 562 sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group); 563 } 564 EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs); 565 566 static int lp55xx_parse_common_child(struct device_node *np, 567 struct lp55xx_led_config *cfg, 568 int led_number, int *chan_nr) 569 { 570 int ret; 571 572 of_property_read_string(np, "chan-name", 573 &cfg[led_number].name); 574 of_property_read_u8(np, "led-cur", 575 &cfg[led_number].led_current); 576 of_property_read_u8(np, "max-cur", 577 &cfg[led_number].max_current); 578 579 ret = of_property_read_u32(np, "reg", chan_nr); 580 if (ret) 581 return ret; 582 583 if (*chan_nr < 0 || *chan_nr > cfg->max_channel) 584 return -EINVAL; 585 586 return 0; 587 } 588 589 static int lp55xx_parse_multi_led_child(struct device_node *child, 590 struct lp55xx_led_config *cfg, 591 int child_number, int color_number) 592 { 593 int chan_nr, color_id, ret; 594 595 ret = lp55xx_parse_common_child(child, cfg, child_number, &chan_nr); 596 if (ret) 597 return ret; 598 599 ret = of_property_read_u32(child, "color", &color_id); 600 if (ret) 601 return ret; 602 603 cfg[child_number].color_id[color_number] = color_id; 604 cfg[child_number].output_num[color_number] = chan_nr; 605 606 return 0; 607 } 608 609 static int lp55xx_parse_multi_led(struct device_node *np, 610 struct lp55xx_led_config *cfg, 611 int child_number) 612 { 613 struct device_node *child; 614 int num_colors = 0, ret; 615 616 for_each_available_child_of_node(np, child) { 617 ret = lp55xx_parse_multi_led_child(child, cfg, child_number, 618 num_colors); 619 if (ret) { 620 of_node_put(child); 621 return ret; 622 } 623 num_colors++; 624 } 625 626 cfg[child_number].num_colors = num_colors; 627 628 return 0; 629 } 630 631 static int lp55xx_parse_logical_led(struct device_node *np, 632 struct lp55xx_led_config *cfg, 633 int child_number) 634 { 635 int led_color, ret; 636 int chan_nr = 0; 637 638 cfg[child_number].default_trigger = 639 of_get_property(np, "linux,default-trigger", NULL); 640 641 ret = of_property_read_u32(np, "color", &led_color); 642 if (ret) 643 return ret; 644 645 if (led_color == LED_COLOR_ID_RGB) 646 return lp55xx_parse_multi_led(np, cfg, child_number); 647 648 ret = lp55xx_parse_common_child(np, cfg, child_number, &chan_nr); 649 if (ret < 0) 650 return ret; 651 652 cfg[child_number].chan_nr = chan_nr; 653 654 return ret; 655 } 656 657 struct lp55xx_platform_data *lp55xx_of_populate_pdata(struct device *dev, 658 struct device_node *np, 659 struct lp55xx_chip *chip) 660 { 661 struct device_node *child; 662 struct lp55xx_platform_data *pdata; 663 struct lp55xx_led_config *cfg; 664 int num_channels; 665 int i = 0; 666 int ret; 667 668 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); 669 if (!pdata) 670 return ERR_PTR(-ENOMEM); 671 672 num_channels = of_get_available_child_count(np); 673 if (num_channels == 0) { 674 dev_err(dev, "no LED channels\n"); 675 return ERR_PTR(-EINVAL); 676 } 677 678 cfg = devm_kcalloc(dev, num_channels, sizeof(*cfg), GFP_KERNEL); 679 if (!cfg) 680 return ERR_PTR(-ENOMEM); 681 682 pdata->led_config = &cfg[0]; 683 pdata->num_channels = num_channels; 684 cfg->max_channel = chip->cfg->max_channel; 685 686 for_each_available_child_of_node(np, child) { 687 ret = lp55xx_parse_logical_led(child, cfg, i); 688 if (ret) { 689 of_node_put(child); 690 return ERR_PTR(-EINVAL); 691 } 692 i++; 693 } 694 695 if (of_property_read_u32(np, "ti,charge-pump-mode", &pdata->charge_pump_mode)) 696 pdata->charge_pump_mode = LP55XX_CP_AUTO; 697 698 if (pdata->charge_pump_mode > LP55XX_CP_AUTO) { 699 dev_err(dev, "invalid charge pump mode %d\n", pdata->charge_pump_mode); 700 return ERR_PTR(-EINVAL); 701 } 702 703 of_property_read_string(np, "label", &pdata->label); 704 of_property_read_u8(np, "clock-mode", &pdata->clock_mode); 705 706 pdata->enable_gpiod = devm_gpiod_get_optional(dev, "enable", 707 GPIOD_ASIS); 708 if (IS_ERR(pdata->enable_gpiod)) 709 return ERR_CAST(pdata->enable_gpiod); 710 711 /* LP8501 specific */ 712 of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel); 713 714 return pdata; 715 } 716 EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata); 717 718 MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>"); 719 MODULE_DESCRIPTION("LP55xx Common Driver"); 720 MODULE_LICENSE("GPL"); 721