1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * LP5562 LED driver 4 * 5 * Copyright (C) 2013 Texas Instruments 6 * 7 * Author: Milo(Woogyom) Kim <milo.kim@ti.com> 8 */ 9 10 #include <linux/delay.h> 11 #include <linux/firmware.h> 12 #include <linux/i2c.h> 13 #include <linux/leds.h> 14 #include <linux/module.h> 15 #include <linux/mutex.h> 16 #include <linux/of.h> 17 #include <linux/platform_data/leds-lp55xx.h> 18 #include <linux/slab.h> 19 20 #include "leds-lp55xx-common.h" 21 22 #define LP5562_PROGRAM_LENGTH 32 23 #define LP5562_MAX_LEDS 4 24 25 /* ENABLE Register 00h */ 26 #define LP5562_REG_ENABLE 0x00 27 #define LP5562_EXEC_ENG1_M 0x30 28 #define LP5562_EXEC_ENG2_M 0x0C 29 #define LP5562_EXEC_ENG3_M 0x03 30 #define LP5562_EXEC_M 0x3F 31 #define LP5562_MASTER_ENABLE 0x40 /* Chip master enable */ 32 #define LP5562_LOGARITHMIC_PWM 0x80 /* Logarithmic PWM adjustment */ 33 #define LP5562_EXEC_RUN 0x2A 34 #define LP5562_ENABLE_DEFAULT \ 35 (LP5562_MASTER_ENABLE | LP5562_LOGARITHMIC_PWM) 36 #define LP5562_ENABLE_RUN_PROGRAM \ 37 (LP5562_ENABLE_DEFAULT | LP5562_EXEC_RUN) 38 39 /* OPMODE Register 01h */ 40 #define LP5562_REG_OP_MODE 0x01 41 #define LP5562_MODE_ENG1_M 0x30 42 #define LP5562_MODE_ENG2_M 0x0C 43 #define LP5562_MODE_ENG3_M 0x03 44 #define LP5562_LOAD_ENG1 0x10 45 #define LP5562_LOAD_ENG2 0x04 46 #define LP5562_LOAD_ENG3 0x01 47 #define LP5562_RUN_ENG1 0x20 48 #define LP5562_RUN_ENG2 0x08 49 #define LP5562_RUN_ENG3 0x02 50 #define LP5562_ENG1_IS_LOADING(mode) \ 51 ((mode & LP5562_MODE_ENG1_M) == LP5562_LOAD_ENG1) 52 #define LP5562_ENG2_IS_LOADING(mode) \ 53 ((mode & LP5562_MODE_ENG2_M) == LP5562_LOAD_ENG2) 54 #define LP5562_ENG3_IS_LOADING(mode) \ 55 ((mode & LP5562_MODE_ENG3_M) == LP5562_LOAD_ENG3) 56 57 /* BRIGHTNESS Registers */ 58 #define LP5562_REG_R_PWM 0x04 59 #define LP5562_REG_G_PWM 0x03 60 #define LP5562_REG_B_PWM 0x02 61 #define LP5562_REG_W_PWM 0x0E 62 63 /* CURRENT Registers */ 64 #define LP5562_REG_R_CURRENT 0x07 65 #define LP5562_REG_G_CURRENT 0x06 66 #define LP5562_REG_B_CURRENT 0x05 67 #define LP5562_REG_W_CURRENT 0x0F 68 69 /* CONFIG Register 08h */ 70 #define LP5562_REG_CONFIG 0x08 71 #define LP5562_PWM_HF 0x40 72 #define LP5562_PWRSAVE_EN 0x20 73 #define LP5562_CLK_INT 0x01 /* Internal clock */ 74 #define LP5562_DEFAULT_CFG (LP5562_PWM_HF | LP5562_PWRSAVE_EN) 75 76 /* RESET Register 0Dh */ 77 #define LP5562_REG_RESET 0x0D 78 #define LP5562_RESET 0xFF 79 80 /* PROGRAM ENGINE Registers */ 81 #define LP5562_REG_PROG_MEM_ENG1 0x10 82 #define LP5562_REG_PROG_MEM_ENG2 0x30 83 #define LP5562_REG_PROG_MEM_ENG3 0x50 84 85 /* LEDMAP Register 70h */ 86 #define LP5562_REG_ENG_SEL 0x70 87 #define LP5562_ENG_SEL_PWM 0 88 #define LP5562_ENG_FOR_RGB_M 0x3F 89 #define LP5562_ENG_SEL_RGB 0x1B /* R:ENG1, G:ENG2, B:ENG3 */ 90 #define LP5562_ENG_FOR_W_M 0xC0 91 #define LP5562_ENG1_FOR_W 0x40 /* W:ENG1 */ 92 #define LP5562_ENG2_FOR_W 0x80 /* W:ENG2 */ 93 #define LP5562_ENG3_FOR_W 0xC0 /* W:ENG3 */ 94 95 /* Program Commands */ 96 #define LP5562_CMD_DISABLE 0x00 97 #define LP5562_CMD_LOAD 0x15 98 #define LP5562_CMD_RUN 0x2A 99 #define LP5562_CMD_DIRECT 0x3F 100 #define LP5562_PATTERN_OFF 0 101 102 static inline void lp5562_wait_opmode_done(void) 103 { 104 /* operation mode change needs to be longer than 153 us */ 105 usleep_range(200, 300); 106 } 107 108 static inline void lp5562_wait_enable_done(void) 109 { 110 /* it takes more 488 us to update ENABLE register */ 111 usleep_range(500, 600); 112 } 113 114 static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current) 115 { 116 static const u8 addr[] = { 117 LP5562_REG_R_CURRENT, 118 LP5562_REG_G_CURRENT, 119 LP5562_REG_B_CURRENT, 120 LP5562_REG_W_CURRENT, 121 }; 122 123 led->led_current = led_current; 124 lp55xx_write(led->chip, addr[led->chan_nr], led_current); 125 } 126 127 static void lp5562_load_engine(struct lp55xx_chip *chip) 128 { 129 enum lp55xx_engine_index idx = chip->engine_idx; 130 static const u8 mask[] = { 131 [LP55XX_ENGINE_1] = LP5562_MODE_ENG1_M, 132 [LP55XX_ENGINE_2] = LP5562_MODE_ENG2_M, 133 [LP55XX_ENGINE_3] = LP5562_MODE_ENG3_M, 134 }; 135 136 static const u8 val[] = { 137 [LP55XX_ENGINE_1] = LP5562_LOAD_ENG1, 138 [LP55XX_ENGINE_2] = LP5562_LOAD_ENG2, 139 [LP55XX_ENGINE_3] = LP5562_LOAD_ENG3, 140 }; 141 142 lp55xx_update_bits(chip, LP5562_REG_OP_MODE, mask[idx], val[idx]); 143 144 lp5562_wait_opmode_done(); 145 } 146 147 static void lp5562_stop_engine(struct lp55xx_chip *chip) 148 { 149 lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DISABLE); 150 lp5562_wait_opmode_done(); 151 } 152 153 static void lp5562_run_engine(struct lp55xx_chip *chip, bool start) 154 { 155 int ret; 156 u8 mode; 157 u8 exec; 158 159 /* stop engine */ 160 if (!start) { 161 lp55xx_write(chip, LP5562_REG_ENABLE, LP5562_ENABLE_DEFAULT); 162 lp5562_wait_enable_done(); 163 lp5562_stop_engine(chip); 164 lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM); 165 lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT); 166 lp5562_wait_opmode_done(); 167 return; 168 } 169 170 /* 171 * To run the engine, 172 * operation mode and enable register should updated at the same time 173 */ 174 175 ret = lp55xx_read(chip, LP5562_REG_OP_MODE, &mode); 176 if (ret) 177 return; 178 179 ret = lp55xx_read(chip, LP5562_REG_ENABLE, &exec); 180 if (ret) 181 return; 182 183 /* change operation mode to RUN only when each engine is loading */ 184 if (LP5562_ENG1_IS_LOADING(mode)) { 185 mode = (mode & ~LP5562_MODE_ENG1_M) | LP5562_RUN_ENG1; 186 exec = (exec & ~LP5562_EXEC_ENG1_M) | LP5562_RUN_ENG1; 187 } 188 189 if (LP5562_ENG2_IS_LOADING(mode)) { 190 mode = (mode & ~LP5562_MODE_ENG2_M) | LP5562_RUN_ENG2; 191 exec = (exec & ~LP5562_EXEC_ENG2_M) | LP5562_RUN_ENG2; 192 } 193 194 if (LP5562_ENG3_IS_LOADING(mode)) { 195 mode = (mode & ~LP5562_MODE_ENG3_M) | LP5562_RUN_ENG3; 196 exec = (exec & ~LP5562_EXEC_ENG3_M) | LP5562_RUN_ENG3; 197 } 198 199 lp55xx_write(chip, LP5562_REG_OP_MODE, mode); 200 lp5562_wait_opmode_done(); 201 202 lp55xx_update_bits(chip, LP5562_REG_ENABLE, LP5562_EXEC_M, exec); 203 lp5562_wait_enable_done(); 204 } 205 206 static int lp5562_update_firmware(struct lp55xx_chip *chip, 207 const u8 *data, size_t size) 208 { 209 enum lp55xx_engine_index idx = chip->engine_idx; 210 u8 pattern[LP5562_PROGRAM_LENGTH] = {0}; 211 static const u8 addr[] = { 212 [LP55XX_ENGINE_1] = LP5562_REG_PROG_MEM_ENG1, 213 [LP55XX_ENGINE_2] = LP5562_REG_PROG_MEM_ENG2, 214 [LP55XX_ENGINE_3] = LP5562_REG_PROG_MEM_ENG3, 215 }; 216 unsigned cmd; 217 char c[3]; 218 int program_size; 219 int nrchars; 220 int offset = 0; 221 int ret; 222 int i; 223 224 /* clear program memory before updating */ 225 for (i = 0; i < LP5562_PROGRAM_LENGTH; i++) 226 lp55xx_write(chip, addr[idx] + i, 0); 227 228 i = 0; 229 while ((offset < size - 1) && (i < LP5562_PROGRAM_LENGTH)) { 230 /* separate sscanfs because length is working only for %s */ 231 ret = sscanf(data + offset, "%2s%n ", c, &nrchars); 232 if (ret != 1) 233 goto err; 234 235 ret = sscanf(c, "%2x", &cmd); 236 if (ret != 1) 237 goto err; 238 239 pattern[i] = (u8)cmd; 240 offset += nrchars; 241 i++; 242 } 243 244 /* Each instruction is 16bit long. Check that length is even */ 245 if (i % 2) 246 goto err; 247 248 program_size = i; 249 for (i = 0; i < program_size; i++) 250 lp55xx_write(chip, addr[idx] + i, pattern[i]); 251 252 return 0; 253 254 err: 255 dev_err(&chip->cl->dev, "wrong pattern format\n"); 256 return -EINVAL; 257 } 258 259 static void lp5562_firmware_loaded(struct lp55xx_chip *chip) 260 { 261 const struct firmware *fw = chip->fw; 262 263 if (fw->size > LP5562_PROGRAM_LENGTH) { 264 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", 265 fw->size); 266 return; 267 } 268 269 /* 270 * Program memory sequence 271 * 1) set engine mode to "LOAD" 272 * 2) write firmware data into program memory 273 */ 274 275 lp5562_load_engine(chip); 276 lp5562_update_firmware(chip, fw->data, fw->size); 277 } 278 279 static int lp5562_post_init_device(struct lp55xx_chip *chip) 280 { 281 int ret; 282 u8 cfg = LP5562_DEFAULT_CFG; 283 284 /* Set all PWMs to direct control mode */ 285 ret = lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT); 286 if (ret) 287 return ret; 288 289 lp5562_wait_opmode_done(); 290 291 /* Update configuration for the clock setting */ 292 if (!lp55xx_is_extclk_used(chip)) 293 cfg |= LP5562_CLK_INT; 294 295 ret = lp55xx_write(chip, LP5562_REG_CONFIG, cfg); 296 if (ret) 297 return ret; 298 299 /* Initialize all channels PWM to zero -> leds off */ 300 lp55xx_write(chip, LP5562_REG_R_PWM, 0); 301 lp55xx_write(chip, LP5562_REG_G_PWM, 0); 302 lp55xx_write(chip, LP5562_REG_B_PWM, 0); 303 lp55xx_write(chip, LP5562_REG_W_PWM, 0); 304 305 /* Set LED map as register PWM by default */ 306 lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM); 307 308 return 0; 309 } 310 311 static int lp5562_led_brightness(struct lp55xx_led *led) 312 { 313 struct lp55xx_chip *chip = led->chip; 314 static const u8 addr[] = { 315 LP5562_REG_R_PWM, 316 LP5562_REG_G_PWM, 317 LP5562_REG_B_PWM, 318 LP5562_REG_W_PWM, 319 }; 320 int ret; 321 322 mutex_lock(&chip->lock); 323 ret = lp55xx_write(chip, addr[led->chan_nr], led->brightness); 324 mutex_unlock(&chip->lock); 325 326 return ret; 327 } 328 329 static void lp5562_write_program_memory(struct lp55xx_chip *chip, 330 u8 base, const u8 *rgb, int size) 331 { 332 int i; 333 334 if (!rgb || size <= 0) 335 return; 336 337 for (i = 0; i < size; i++) 338 lp55xx_write(chip, base + i, *(rgb + i)); 339 340 lp55xx_write(chip, base + i, 0); 341 lp55xx_write(chip, base + i + 1, 0); 342 } 343 344 /* check the size of program count */ 345 static inline bool _is_pc_overflow(struct lp55xx_predef_pattern *ptn) 346 { 347 return ptn->size_r >= LP5562_PROGRAM_LENGTH || 348 ptn->size_g >= LP5562_PROGRAM_LENGTH || 349 ptn->size_b >= LP5562_PROGRAM_LENGTH; 350 } 351 352 static int lp5562_run_predef_led_pattern(struct lp55xx_chip *chip, int mode) 353 { 354 struct lp55xx_predef_pattern *ptn; 355 int i; 356 357 if (mode == LP5562_PATTERN_OFF) { 358 lp5562_run_engine(chip, false); 359 return 0; 360 } 361 362 ptn = chip->pdata->patterns + (mode - 1); 363 if (!ptn || _is_pc_overflow(ptn)) { 364 dev_err(&chip->cl->dev, "invalid pattern data\n"); 365 return -EINVAL; 366 } 367 368 lp5562_stop_engine(chip); 369 370 /* Set LED map as RGB */ 371 lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_RGB); 372 373 /* Load engines */ 374 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) { 375 chip->engine_idx = i; 376 lp5562_load_engine(chip); 377 } 378 379 /* Clear program registers */ 380 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1, 0); 381 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1 + 1, 0); 382 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2, 0); 383 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2 + 1, 0); 384 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3, 0); 385 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3 + 1, 0); 386 387 /* Program engines */ 388 lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG1, 389 ptn->r, ptn->size_r); 390 lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG2, 391 ptn->g, ptn->size_g); 392 lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG3, 393 ptn->b, ptn->size_b); 394 395 /* Run engines */ 396 lp5562_run_engine(chip, true); 397 398 return 0; 399 } 400 401 static ssize_t lp5562_store_pattern(struct device *dev, 402 struct device_attribute *attr, 403 const char *buf, size_t len) 404 { 405 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 406 struct lp55xx_chip *chip = led->chip; 407 struct lp55xx_predef_pattern *ptn = chip->pdata->patterns; 408 int num_patterns = chip->pdata->num_patterns; 409 unsigned long mode; 410 int ret; 411 412 ret = kstrtoul(buf, 0, &mode); 413 if (ret) 414 return ret; 415 416 if (mode > num_patterns || !ptn) 417 return -EINVAL; 418 419 mutex_lock(&chip->lock); 420 ret = lp5562_run_predef_led_pattern(chip, mode); 421 mutex_unlock(&chip->lock); 422 423 if (ret) 424 return ret; 425 426 return len; 427 } 428 429 static ssize_t lp5562_store_engine_mux(struct device *dev, 430 struct device_attribute *attr, 431 const char *buf, size_t len) 432 { 433 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 434 struct lp55xx_chip *chip = led->chip; 435 u8 mask; 436 u8 val; 437 438 /* LED map 439 * R ... Engine 1 (fixed) 440 * G ... Engine 2 (fixed) 441 * B ... Engine 3 (fixed) 442 * W ... Engine 1 or 2 or 3 443 */ 444 445 if (sysfs_streq(buf, "RGB")) { 446 mask = LP5562_ENG_FOR_RGB_M; 447 val = LP5562_ENG_SEL_RGB; 448 } else if (sysfs_streq(buf, "W")) { 449 enum lp55xx_engine_index idx = chip->engine_idx; 450 451 mask = LP5562_ENG_FOR_W_M; 452 switch (idx) { 453 case LP55XX_ENGINE_1: 454 val = LP5562_ENG1_FOR_W; 455 break; 456 case LP55XX_ENGINE_2: 457 val = LP5562_ENG2_FOR_W; 458 break; 459 case LP55XX_ENGINE_3: 460 val = LP5562_ENG3_FOR_W; 461 break; 462 default: 463 return -EINVAL; 464 } 465 466 } else { 467 dev_err(dev, "choose RGB or W\n"); 468 return -EINVAL; 469 } 470 471 mutex_lock(&chip->lock); 472 lp55xx_update_bits(chip, LP5562_REG_ENG_SEL, mask, val); 473 mutex_unlock(&chip->lock); 474 475 return len; 476 } 477 478 static LP55XX_DEV_ATTR_WO(led_pattern, lp5562_store_pattern); 479 static LP55XX_DEV_ATTR_WO(engine_mux, lp5562_store_engine_mux); 480 481 static struct attribute *lp5562_attributes[] = { 482 &dev_attr_led_pattern.attr, 483 &dev_attr_engine_mux.attr, 484 NULL, 485 }; 486 487 static const struct attribute_group lp5562_group = { 488 .attrs = lp5562_attributes, 489 }; 490 491 /* Chip specific configurations */ 492 static struct lp55xx_device_config lp5562_cfg = { 493 .max_channel = LP5562_MAX_LEDS, 494 .reset = { 495 .addr = LP5562_REG_RESET, 496 .val = LP5562_RESET, 497 }, 498 .enable = { 499 .addr = LP5562_REG_ENABLE, 500 .val = LP5562_ENABLE_DEFAULT, 501 }, 502 .post_init_device = lp5562_post_init_device, 503 .set_led_current = lp5562_set_led_current, 504 .brightness_fn = lp5562_led_brightness, 505 .run_engine = lp5562_run_engine, 506 .firmware_cb = lp5562_firmware_loaded, 507 .dev_attr_group = &lp5562_group, 508 }; 509 510 static int lp5562_probe(struct i2c_client *client, 511 const struct i2c_device_id *id) 512 { 513 int ret; 514 struct lp55xx_chip *chip; 515 struct lp55xx_led *led; 516 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev); 517 struct device_node *np = client->dev.of_node; 518 519 if (!pdata) { 520 if (np) { 521 pdata = lp55xx_of_populate_pdata(&client->dev, np); 522 if (IS_ERR(pdata)) 523 return PTR_ERR(pdata); 524 } else { 525 dev_err(&client->dev, "no platform data\n"); 526 return -EINVAL; 527 } 528 } 529 530 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 531 if (!chip) 532 return -ENOMEM; 533 534 led = devm_kcalloc(&client->dev, 535 pdata->num_channels, sizeof(*led), GFP_KERNEL); 536 if (!led) 537 return -ENOMEM; 538 539 chip->cl = client; 540 chip->pdata = pdata; 541 chip->cfg = &lp5562_cfg; 542 543 mutex_init(&chip->lock); 544 545 i2c_set_clientdata(client, led); 546 547 ret = lp55xx_init_device(chip); 548 if (ret) 549 goto err_init; 550 551 ret = lp55xx_register_leds(led, chip); 552 if (ret) 553 goto err_register_leds; 554 555 ret = lp55xx_register_sysfs(chip); 556 if (ret) { 557 dev_err(&client->dev, "registering sysfs failed\n"); 558 goto err_register_sysfs; 559 } 560 561 return 0; 562 563 err_register_sysfs: 564 lp55xx_unregister_leds(led, chip); 565 err_register_leds: 566 lp55xx_deinit_device(chip); 567 err_init: 568 return ret; 569 } 570 571 static int lp5562_remove(struct i2c_client *client) 572 { 573 struct lp55xx_led *led = i2c_get_clientdata(client); 574 struct lp55xx_chip *chip = led->chip; 575 576 lp5562_stop_engine(chip); 577 578 lp55xx_unregister_sysfs(chip); 579 lp55xx_unregister_leds(led, chip); 580 lp55xx_deinit_device(chip); 581 582 return 0; 583 } 584 585 static const struct i2c_device_id lp5562_id[] = { 586 { "lp5562", 0 }, 587 { } 588 }; 589 MODULE_DEVICE_TABLE(i2c, lp5562_id); 590 591 #ifdef CONFIG_OF 592 static const struct of_device_id of_lp5562_leds_match[] = { 593 { .compatible = "ti,lp5562", }, 594 {}, 595 }; 596 597 MODULE_DEVICE_TABLE(of, of_lp5562_leds_match); 598 #endif 599 600 static struct i2c_driver lp5562_driver = { 601 .driver = { 602 .name = "lp5562", 603 .of_match_table = of_match_ptr(of_lp5562_leds_match), 604 }, 605 .probe = lp5562_probe, 606 .remove = lp5562_remove, 607 .id_table = lp5562_id, 608 }; 609 610 module_i2c_driver(lp5562_driver); 611 612 MODULE_DESCRIPTION("Texas Instruments LP5562 LED Driver"); 613 MODULE_AUTHOR("Milo Kim"); 614 MODULE_LICENSE("GPL"); 615