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 /* 264 * the firmware is encoded in ascii hex character, with 2 chars 265 * per byte 266 */ 267 if (fw->size > (LP5562_PROGRAM_LENGTH * 2)) { 268 dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n", 269 fw->size); 270 return; 271 } 272 273 /* 274 * Program memory sequence 275 * 1) set engine mode to "LOAD" 276 * 2) write firmware data into program memory 277 */ 278 279 lp5562_load_engine(chip); 280 lp5562_update_firmware(chip, fw->data, fw->size); 281 } 282 283 static int lp5562_post_init_device(struct lp55xx_chip *chip) 284 { 285 int ret; 286 u8 cfg = LP5562_DEFAULT_CFG; 287 288 /* Set all PWMs to direct control mode */ 289 ret = lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT); 290 if (ret) 291 return ret; 292 293 lp5562_wait_opmode_done(); 294 295 /* Update configuration for the clock setting */ 296 if (!lp55xx_is_extclk_used(chip)) 297 cfg |= LP5562_CLK_INT; 298 299 ret = lp55xx_write(chip, LP5562_REG_CONFIG, cfg); 300 if (ret) 301 return ret; 302 303 /* Initialize all channels PWM to zero -> leds off */ 304 lp55xx_write(chip, LP5562_REG_R_PWM, 0); 305 lp55xx_write(chip, LP5562_REG_G_PWM, 0); 306 lp55xx_write(chip, LP5562_REG_B_PWM, 0); 307 lp55xx_write(chip, LP5562_REG_W_PWM, 0); 308 309 /* Set LED map as register PWM by default */ 310 lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM); 311 312 return 0; 313 } 314 315 static int lp5562_led_brightness(struct lp55xx_led *led) 316 { 317 struct lp55xx_chip *chip = led->chip; 318 static const u8 addr[] = { 319 LP5562_REG_R_PWM, 320 LP5562_REG_G_PWM, 321 LP5562_REG_B_PWM, 322 LP5562_REG_W_PWM, 323 }; 324 int ret; 325 326 mutex_lock(&chip->lock); 327 ret = lp55xx_write(chip, addr[led->chan_nr], led->brightness); 328 mutex_unlock(&chip->lock); 329 330 return ret; 331 } 332 333 static void lp5562_write_program_memory(struct lp55xx_chip *chip, 334 u8 base, const u8 *rgb, int size) 335 { 336 int i; 337 338 if (!rgb || size <= 0) 339 return; 340 341 for (i = 0; i < size; i++) 342 lp55xx_write(chip, base + i, *(rgb + i)); 343 344 lp55xx_write(chip, base + i, 0); 345 lp55xx_write(chip, base + i + 1, 0); 346 } 347 348 /* check the size of program count */ 349 static inline bool _is_pc_overflow(struct lp55xx_predef_pattern *ptn) 350 { 351 return ptn->size_r >= LP5562_PROGRAM_LENGTH || 352 ptn->size_g >= LP5562_PROGRAM_LENGTH || 353 ptn->size_b >= LP5562_PROGRAM_LENGTH; 354 } 355 356 static int lp5562_run_predef_led_pattern(struct lp55xx_chip *chip, int mode) 357 { 358 struct lp55xx_predef_pattern *ptn; 359 int i; 360 361 if (mode == LP5562_PATTERN_OFF) { 362 lp5562_run_engine(chip, false); 363 return 0; 364 } 365 366 ptn = chip->pdata->patterns + (mode - 1); 367 if (!ptn || _is_pc_overflow(ptn)) { 368 dev_err(&chip->cl->dev, "invalid pattern data\n"); 369 return -EINVAL; 370 } 371 372 lp5562_stop_engine(chip); 373 374 /* Set LED map as RGB */ 375 lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_RGB); 376 377 /* Load engines */ 378 for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) { 379 chip->engine_idx = i; 380 lp5562_load_engine(chip); 381 } 382 383 /* Clear program registers */ 384 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1, 0); 385 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1 + 1, 0); 386 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2, 0); 387 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2 + 1, 0); 388 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3, 0); 389 lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3 + 1, 0); 390 391 /* Program engines */ 392 lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG1, 393 ptn->r, ptn->size_r); 394 lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG2, 395 ptn->g, ptn->size_g); 396 lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG3, 397 ptn->b, ptn->size_b); 398 399 /* Run engines */ 400 lp5562_run_engine(chip, true); 401 402 return 0; 403 } 404 405 static ssize_t lp5562_store_pattern(struct device *dev, 406 struct device_attribute *attr, 407 const char *buf, size_t len) 408 { 409 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 410 struct lp55xx_chip *chip = led->chip; 411 struct lp55xx_predef_pattern *ptn = chip->pdata->patterns; 412 int num_patterns = chip->pdata->num_patterns; 413 unsigned long mode; 414 int ret; 415 416 ret = kstrtoul(buf, 0, &mode); 417 if (ret) 418 return ret; 419 420 if (mode > num_patterns || !ptn) 421 return -EINVAL; 422 423 mutex_lock(&chip->lock); 424 ret = lp5562_run_predef_led_pattern(chip, mode); 425 mutex_unlock(&chip->lock); 426 427 if (ret) 428 return ret; 429 430 return len; 431 } 432 433 static ssize_t lp5562_store_engine_mux(struct device *dev, 434 struct device_attribute *attr, 435 const char *buf, size_t len) 436 { 437 struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev)); 438 struct lp55xx_chip *chip = led->chip; 439 u8 mask; 440 u8 val; 441 442 /* LED map 443 * R ... Engine 1 (fixed) 444 * G ... Engine 2 (fixed) 445 * B ... Engine 3 (fixed) 446 * W ... Engine 1 or 2 or 3 447 */ 448 449 if (sysfs_streq(buf, "RGB")) { 450 mask = LP5562_ENG_FOR_RGB_M; 451 val = LP5562_ENG_SEL_RGB; 452 } else if (sysfs_streq(buf, "W")) { 453 enum lp55xx_engine_index idx = chip->engine_idx; 454 455 mask = LP5562_ENG_FOR_W_M; 456 switch (idx) { 457 case LP55XX_ENGINE_1: 458 val = LP5562_ENG1_FOR_W; 459 break; 460 case LP55XX_ENGINE_2: 461 val = LP5562_ENG2_FOR_W; 462 break; 463 case LP55XX_ENGINE_3: 464 val = LP5562_ENG3_FOR_W; 465 break; 466 default: 467 return -EINVAL; 468 } 469 470 } else { 471 dev_err(dev, "choose RGB or W\n"); 472 return -EINVAL; 473 } 474 475 mutex_lock(&chip->lock); 476 lp55xx_update_bits(chip, LP5562_REG_ENG_SEL, mask, val); 477 mutex_unlock(&chip->lock); 478 479 return len; 480 } 481 482 static LP55XX_DEV_ATTR_WO(led_pattern, lp5562_store_pattern); 483 static LP55XX_DEV_ATTR_WO(engine_mux, lp5562_store_engine_mux); 484 485 static struct attribute *lp5562_attributes[] = { 486 &dev_attr_led_pattern.attr, 487 &dev_attr_engine_mux.attr, 488 NULL, 489 }; 490 491 static const struct attribute_group lp5562_group = { 492 .attrs = lp5562_attributes, 493 }; 494 495 /* Chip specific configurations */ 496 static struct lp55xx_device_config lp5562_cfg = { 497 .max_channel = LP5562_MAX_LEDS, 498 .reset = { 499 .addr = LP5562_REG_RESET, 500 .val = LP5562_RESET, 501 }, 502 .enable = { 503 .addr = LP5562_REG_ENABLE, 504 .val = LP5562_ENABLE_DEFAULT, 505 }, 506 .post_init_device = lp5562_post_init_device, 507 .set_led_current = lp5562_set_led_current, 508 .brightness_fn = lp5562_led_brightness, 509 .run_engine = lp5562_run_engine, 510 .firmware_cb = lp5562_firmware_loaded, 511 .dev_attr_group = &lp5562_group, 512 }; 513 514 static int lp5562_probe(struct i2c_client *client) 515 { 516 int ret; 517 struct lp55xx_chip *chip; 518 struct lp55xx_led *led; 519 struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev); 520 struct device_node *np = dev_of_node(&client->dev); 521 522 chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL); 523 if (!chip) 524 return -ENOMEM; 525 526 chip->cfg = &lp5562_cfg; 527 528 if (!pdata) { 529 if (np) { 530 pdata = lp55xx_of_populate_pdata(&client->dev, np, 531 chip); 532 if (IS_ERR(pdata)) 533 return PTR_ERR(pdata); 534 } else { 535 dev_err(&client->dev, "no platform data\n"); 536 return -EINVAL; 537 } 538 } 539 540 541 led = devm_kcalloc(&client->dev, 542 pdata->num_channels, sizeof(*led), GFP_KERNEL); 543 if (!led) 544 return -ENOMEM; 545 546 chip->cl = client; 547 chip->pdata = pdata; 548 549 mutex_init(&chip->lock); 550 551 i2c_set_clientdata(client, led); 552 553 ret = lp55xx_init_device(chip); 554 if (ret) 555 goto err_init; 556 557 ret = lp55xx_register_leds(led, chip); 558 if (ret) 559 goto err_out; 560 561 ret = lp55xx_register_sysfs(chip); 562 if (ret) { 563 dev_err(&client->dev, "registering sysfs failed\n"); 564 goto err_out; 565 } 566 567 return 0; 568 569 err_out: 570 lp55xx_deinit_device(chip); 571 err_init: 572 return ret; 573 } 574 575 static void lp5562_remove(struct i2c_client *client) 576 { 577 struct lp55xx_led *led = i2c_get_clientdata(client); 578 struct lp55xx_chip *chip = led->chip; 579 580 lp5562_stop_engine(chip); 581 582 lp55xx_unregister_sysfs(chip); 583 lp55xx_deinit_device(chip); 584 } 585 586 static const struct i2c_device_id lp5562_id[] = { 587 { "lp5562", 0 }, 588 { } 589 }; 590 MODULE_DEVICE_TABLE(i2c, lp5562_id); 591 592 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); 598 599 static struct i2c_driver lp5562_driver = { 600 .driver = { 601 .name = "lp5562", 602 .of_match_table = of_lp5562_leds_match, 603 }, 604 .probe = lp5562_probe, 605 .remove = lp5562_remove, 606 .id_table = lp5562_id, 607 }; 608 609 module_i2c_driver(lp5562_driver); 610 611 MODULE_DESCRIPTION("Texas Instruments LP5562 LED Driver"); 612 MODULE_AUTHOR("Milo Kim"); 613 MODULE_LICENSE("GPL"); 614