leds-lp5562.c 14.8 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618
/*
 * LP5562 LED driver
 *
 * Copyright (C) 2013 Texas Instruments
 *
 * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/platform_data/leds-lp55xx.h>
#include <linux/slab.h>

#include "leds-lp55xx-common.h"

#define LP5562_PROGRAM_LENGTH		32
#define LP5562_MAX_LEDS			4

/* ENABLE Register 00h */
#define LP5562_REG_ENABLE		0x00
#define LP5562_EXEC_ENG1_M		0x30
#define LP5562_EXEC_ENG2_M		0x0C
#define LP5562_EXEC_ENG3_M		0x03
#define LP5562_EXEC_M			0x3F
#define LP5562_MASTER_ENABLE		0x40	/* Chip master enable */
#define LP5562_LOGARITHMIC_PWM		0x80	/* Logarithmic PWM adjustment */
#define LP5562_EXEC_RUN			0x2A
#define LP5562_ENABLE_DEFAULT	\
	(LP5562_MASTER_ENABLE | LP5562_LOGARITHMIC_PWM)
#define LP5562_ENABLE_RUN_PROGRAM	\
	(LP5562_ENABLE_DEFAULT | LP5562_EXEC_RUN)

/* OPMODE Register 01h */
#define LP5562_REG_OP_MODE		0x01
#define LP5562_MODE_ENG1_M		0x30
#define LP5562_MODE_ENG2_M		0x0C
#define LP5562_MODE_ENG3_M		0x03
#define LP5562_LOAD_ENG1		0x10
#define LP5562_LOAD_ENG2		0x04
#define LP5562_LOAD_ENG3		0x01
#define LP5562_RUN_ENG1			0x20
#define LP5562_RUN_ENG2			0x08
#define LP5562_RUN_ENG3			0x02
#define LP5562_ENG1_IS_LOADING(mode)	\
	((mode & LP5562_MODE_ENG1_M) == LP5562_LOAD_ENG1)
#define LP5562_ENG2_IS_LOADING(mode)	\
	((mode & LP5562_MODE_ENG2_M) == LP5562_LOAD_ENG2)
#define LP5562_ENG3_IS_LOADING(mode)	\
	((mode & LP5562_MODE_ENG3_M) == LP5562_LOAD_ENG3)

/* BRIGHTNESS Registers */
#define LP5562_REG_R_PWM		0x04
#define LP5562_REG_G_PWM		0x03
#define LP5562_REG_B_PWM		0x02
#define LP5562_REG_W_PWM		0x0E

/* CURRENT Registers */
#define LP5562_REG_R_CURRENT		0x07
#define LP5562_REG_G_CURRENT		0x06
#define LP5562_REG_B_CURRENT		0x05
#define LP5562_REG_W_CURRENT		0x0F

/* CONFIG Register 08h */
#define LP5562_REG_CONFIG		0x08
#define LP5562_PWM_HF			0x40
#define LP5562_PWRSAVE_EN		0x20
#define LP5562_CLK_INT			0x01	/* Internal clock */
#define LP5562_DEFAULT_CFG		(LP5562_PWM_HF | LP5562_PWRSAVE_EN)

/* RESET Register 0Dh */
#define LP5562_REG_RESET		0x0D
#define LP5562_RESET			0xFF

/* PROGRAM ENGINE Registers */
#define LP5562_REG_PROG_MEM_ENG1	0x10
#define LP5562_REG_PROG_MEM_ENG2	0x30
#define LP5562_REG_PROG_MEM_ENG3	0x50

/* LEDMAP Register 70h */
#define LP5562_REG_ENG_SEL		0x70
#define LP5562_ENG_SEL_PWM		0
#define LP5562_ENG_FOR_RGB_M		0x3F
#define LP5562_ENG_SEL_RGB		0x1B	/* R:ENG1, G:ENG2, B:ENG3 */
#define LP5562_ENG_FOR_W_M		0xC0
#define LP5562_ENG1_FOR_W		0x40	/* W:ENG1 */
#define LP5562_ENG2_FOR_W		0x80	/* W:ENG2 */
#define LP5562_ENG3_FOR_W		0xC0	/* W:ENG3 */

/* Program Commands */
#define LP5562_CMD_DISABLE		0x00
#define LP5562_CMD_LOAD			0x15
#define LP5562_CMD_RUN			0x2A
#define LP5562_CMD_DIRECT		0x3F
#define LP5562_PATTERN_OFF		0

static inline void lp5562_wait_opmode_done(void)
{
	/* operation mode change needs to be longer than 153 us */
	usleep_range(200, 300);
}

static inline void lp5562_wait_enable_done(void)
{
	/* it takes more 488 us to update ENABLE register */
	usleep_range(500, 600);
}

static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current)
{
	u8 addr[] = {
		LP5562_REG_R_CURRENT,
		LP5562_REG_G_CURRENT,
		LP5562_REG_B_CURRENT,
		LP5562_REG_W_CURRENT,
	};

	led->led_current = led_current;
	lp55xx_write(led->chip, addr[led->chan_nr], led_current);
}

static void lp5562_load_engine(struct lp55xx_chip *chip)
{
	enum lp55xx_engine_index idx = chip->engine_idx;
	u8 mask[] = {
		[LP55XX_ENGINE_1] = LP5562_MODE_ENG1_M,
		[LP55XX_ENGINE_2] = LP5562_MODE_ENG2_M,
		[LP55XX_ENGINE_3] = LP5562_MODE_ENG3_M,
	};

	u8 val[] = {
		[LP55XX_ENGINE_1] = LP5562_LOAD_ENG1,
		[LP55XX_ENGINE_2] = LP5562_LOAD_ENG2,
		[LP55XX_ENGINE_3] = LP5562_LOAD_ENG3,
	};

	lp55xx_update_bits(chip, LP5562_REG_OP_MODE, mask[idx], val[idx]);

	lp5562_wait_opmode_done();
}

static void lp5562_stop_engine(struct lp55xx_chip *chip)
{
	lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DISABLE);
	lp5562_wait_opmode_done();
}

static void lp5562_run_engine(struct lp55xx_chip *chip, bool start)
{
	int ret;
	u8 mode;
	u8 exec;

	/* stop engine */
	if (!start) {
		lp55xx_write(chip, LP5562_REG_ENABLE, LP5562_ENABLE_DEFAULT);
		lp5562_wait_enable_done();
		lp5562_stop_engine(chip);
		lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
		lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
		lp5562_wait_opmode_done();
		return;
	}

	/*
	 * To run the engine,
	 * operation mode and enable register should updated at the same time
	 */

	ret = lp55xx_read(chip, LP5562_REG_OP_MODE, &mode);
	if (ret)
		return;

	ret = lp55xx_read(chip, LP5562_REG_ENABLE, &exec);
	if (ret)
		return;

	/* change operation mode to RUN only when each engine is loading */
	if (LP5562_ENG1_IS_LOADING(mode)) {
		mode = (mode & ~LP5562_MODE_ENG1_M) | LP5562_RUN_ENG1;
		exec = (exec & ~LP5562_EXEC_ENG1_M) | LP5562_RUN_ENG1;
	}

	if (LP5562_ENG2_IS_LOADING(mode)) {
		mode = (mode & ~LP5562_MODE_ENG2_M) | LP5562_RUN_ENG2;
		exec = (exec & ~LP5562_EXEC_ENG2_M) | LP5562_RUN_ENG2;
	}

	if (LP5562_ENG3_IS_LOADING(mode)) {
		mode = (mode & ~LP5562_MODE_ENG3_M) | LP5562_RUN_ENG3;
		exec = (exec & ~LP5562_EXEC_ENG3_M) | LP5562_RUN_ENG3;
	}

	lp55xx_write(chip, LP5562_REG_OP_MODE, mode);
	lp5562_wait_opmode_done();

	lp55xx_update_bits(chip, LP5562_REG_ENABLE, LP5562_EXEC_M, exec);
	lp5562_wait_enable_done();
}

static int lp5562_update_firmware(struct lp55xx_chip *chip,
					const u8 *data, size_t size)
{
	enum lp55xx_engine_index idx = chip->engine_idx;
	u8 pattern[LP5562_PROGRAM_LENGTH] = {0};
	u8 addr[] = {
		[LP55XX_ENGINE_1] = LP5562_REG_PROG_MEM_ENG1,
		[LP55XX_ENGINE_2] = LP5562_REG_PROG_MEM_ENG2,
		[LP55XX_ENGINE_3] = LP5562_REG_PROG_MEM_ENG3,
	};
	unsigned cmd;
	char c[3];
	int program_size;
	int nrchars;
	int offset = 0;
	int ret;
	int i;

	/* clear program memory before updating */
	for (i = 0; i < LP5562_PROGRAM_LENGTH; i++)
		lp55xx_write(chip, addr[idx] + i, 0);

	i = 0;
	while ((offset < size - 1) && (i < LP5562_PROGRAM_LENGTH)) {
		/* separate sscanfs because length is working only for %s */
		ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
		if (ret != 1)
			goto err;

		ret = sscanf(c, "%2x", &cmd);
		if (ret != 1)
			goto err;

		pattern[i] = (u8)cmd;
		offset += nrchars;
		i++;
	}

	/* Each instruction is 16bit long. Check that length is even */
	if (i % 2)
		goto err;

	program_size = i;
	for (i = 0; i < program_size; i++)
		lp55xx_write(chip, addr[idx] + i, pattern[i]);

	return 0;

err:
	dev_err(&chip->cl->dev, "wrong pattern format\n");
	return -EINVAL;
}

static void lp5562_firmware_loaded(struct lp55xx_chip *chip)
{
	const struct firmware *fw = chip->fw;

	if (fw->size > LP5562_PROGRAM_LENGTH) {
		dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
			fw->size);
		return;
	}

	/*
	 * Program momery sequence
	 *  1) set engine mode to "LOAD"
	 *  2) write firmware data into program memory
	 */

	lp5562_load_engine(chip);
	lp5562_update_firmware(chip, fw->data, fw->size);
}

static int lp5562_post_init_device(struct lp55xx_chip *chip)
{
	int ret;
	u8 cfg = LP5562_DEFAULT_CFG;

	/* Set all PWMs to direct control mode */
	ret = lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
	if (ret)
		return ret;

	lp5562_wait_opmode_done();

	/* Update configuration for the clock setting */
	if (!lp55xx_is_extclk_used(chip))
		cfg |= LP5562_CLK_INT;

	ret = lp55xx_write(chip, LP5562_REG_CONFIG, cfg);
	if (ret)
		return ret;

	/* Initialize all channels PWM to zero -> leds off */
	lp55xx_write(chip, LP5562_REG_R_PWM, 0);
	lp55xx_write(chip, LP5562_REG_G_PWM, 0);
	lp55xx_write(chip, LP5562_REG_B_PWM, 0);
	lp55xx_write(chip, LP5562_REG_W_PWM, 0);

	/* Set LED map as register PWM by default */
	lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);

	return 0;
}

static void lp5562_led_brightness_work(struct work_struct *work)
{
	struct lp55xx_led *led = container_of(work, struct lp55xx_led,
					      brightness_work);
	struct lp55xx_chip *chip = led->chip;
	u8 addr[] = {
		LP5562_REG_R_PWM,
		LP5562_REG_G_PWM,
		LP5562_REG_B_PWM,
		LP5562_REG_W_PWM,
	};

	mutex_lock(&chip->lock);
	lp55xx_write(chip, addr[led->chan_nr], led->brightness);
	mutex_unlock(&chip->lock);
}

static void lp5562_write_program_memory(struct lp55xx_chip *chip,
					u8 base, const u8 *rgb, int size)
{
	int i;

	if (!rgb || size <= 0)
		return;

	for (i = 0; i < size; i++)
		lp55xx_write(chip, base + i, *(rgb + i));

	lp55xx_write(chip, base + i, 0);
	lp55xx_write(chip, base + i + 1, 0);
}

/* check the size of program count */
static inline bool _is_pc_overflow(struct lp55xx_predef_pattern *ptn)
{
	return (ptn->size_r >= LP5562_PROGRAM_LENGTH ||
		ptn->size_g >= LP5562_PROGRAM_LENGTH ||
		ptn->size_b >= LP5562_PROGRAM_LENGTH);
}

static int lp5562_run_predef_led_pattern(struct lp55xx_chip *chip, int mode)
{
	struct lp55xx_predef_pattern *ptn;
	int i;

	if (mode == LP5562_PATTERN_OFF) {
		lp5562_run_engine(chip, false);
		return 0;
	}

	ptn = chip->pdata->patterns + (mode - 1);
	if (!ptn || _is_pc_overflow(ptn)) {
		dev_err(&chip->cl->dev, "invalid pattern data\n");
		return -EINVAL;
	}

	lp5562_stop_engine(chip);

	/* Set LED map as RGB */
	lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_RGB);

	/* Load engines */
	for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
		chip->engine_idx = i;
		lp5562_load_engine(chip);
	}

	/* Clear program registers */
	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1, 0);
	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1 + 1, 0);
	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2, 0);
	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2 + 1, 0);
	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3, 0);
	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3 + 1, 0);

	/* Program engines */
	lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG1,
				ptn->r, ptn->size_r);
	lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG2,
				ptn->g, ptn->size_g);
	lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG3,
				ptn->b, ptn->size_b);

	/* Run engines */
	lp5562_run_engine(chip, true);

	return 0;
}

static ssize_t lp5562_store_pattern(struct device *dev,
				struct device_attribute *attr,
				const char *buf, size_t len)
{
	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	struct lp55xx_chip *chip = led->chip;
	struct lp55xx_predef_pattern *ptn = chip->pdata->patterns;
	int num_patterns = chip->pdata->num_patterns;
	unsigned long mode;
	int ret;

	ret = kstrtoul(buf, 0, &mode);
	if (ret)
		return ret;

	if (mode > num_patterns || !ptn)
		return -EINVAL;

	mutex_lock(&chip->lock);
	ret = lp5562_run_predef_led_pattern(chip, mode);
	mutex_unlock(&chip->lock);

	if (ret)
		return ret;

	return len;
}

static ssize_t lp5562_store_engine_mux(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t len)
{
	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
	struct lp55xx_chip *chip = led->chip;
	u8 mask;
	u8 val;

	/* LED map
	 * R ... Engine 1 (fixed)
	 * G ... Engine 2 (fixed)
	 * B ... Engine 3 (fixed)
	 * W ... Engine 1 or 2 or 3
	 */

	if (sysfs_streq(buf, "RGB")) {
		mask = LP5562_ENG_FOR_RGB_M;
		val = LP5562_ENG_SEL_RGB;
	} else if (sysfs_streq(buf, "W")) {
		enum lp55xx_engine_index idx = chip->engine_idx;

		mask = LP5562_ENG_FOR_W_M;
		switch (idx) {
		case LP55XX_ENGINE_1:
			val = LP5562_ENG1_FOR_W;
			break;
		case LP55XX_ENGINE_2:
			val = LP5562_ENG2_FOR_W;
			break;
		case LP55XX_ENGINE_3:
			val = LP5562_ENG3_FOR_W;
			break;
		default:
			return -EINVAL;
		}

	} else {
		dev_err(dev, "choose RGB or W\n");
		return -EINVAL;
	}

	mutex_lock(&chip->lock);
	lp55xx_update_bits(chip, LP5562_REG_ENG_SEL, mask, val);
	mutex_unlock(&chip->lock);

	return len;
}

static LP55XX_DEV_ATTR_WO(led_pattern, lp5562_store_pattern);
static LP55XX_DEV_ATTR_WO(engine_mux, lp5562_store_engine_mux);

static struct attribute *lp5562_attributes[] = {
	&dev_attr_led_pattern.attr,
	&dev_attr_engine_mux.attr,
	NULL,
};

static const struct attribute_group lp5562_group = {
	.attrs = lp5562_attributes,
};

/* Chip specific configurations */
static struct lp55xx_device_config lp5562_cfg = {
	.max_channel  = LP5562_MAX_LEDS,
	.reset = {
		.addr = LP5562_REG_RESET,
		.val  = LP5562_RESET,
	},
	.enable = {
		.addr = LP5562_REG_ENABLE,
		.val  = LP5562_ENABLE_DEFAULT,
	},
	.post_init_device   = lp5562_post_init_device,
	.set_led_current    = lp5562_set_led_current,
	.brightness_work_fn = lp5562_led_brightness_work,
	.run_engine         = lp5562_run_engine,
	.firmware_cb        = lp5562_firmware_loaded,
	.dev_attr_group     = &lp5562_group,
};

static int lp5562_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int ret;
	struct lp55xx_chip *chip;
	struct lp55xx_led *led;
	struct lp55xx_platform_data *pdata;
	struct device_node *np = client->dev.of_node;

	if (!dev_get_platdata(&client->dev)) {
		if (np) {
			ret = lp55xx_of_populate_pdata(&client->dev, np);
			if (ret < 0)
				return ret;
		} else {
			dev_err(&client->dev, "no platform data\n");
			return -EINVAL;
		}
	}
	pdata = dev_get_platdata(&client->dev);

	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	led = devm_kzalloc(&client->dev,
			sizeof(*led) * pdata->num_channels, GFP_KERNEL);
	if (!led)
		return -ENOMEM;

	chip->cl = client;
	chip->pdata = pdata;
	chip->cfg = &lp5562_cfg;

	mutex_init(&chip->lock);

	i2c_set_clientdata(client, led);

	ret = lp55xx_init_device(chip);
	if (ret)
		goto err_init;

	ret = lp55xx_register_leds(led, chip);
	if (ret)
		goto err_register_leds;

	ret = lp55xx_register_sysfs(chip);
	if (ret) {
		dev_err(&client->dev, "registering sysfs failed\n");
		goto err_register_sysfs;
	}

	return 0;

err_register_sysfs:
	lp55xx_unregister_leds(led, chip);
err_register_leds:
	lp55xx_deinit_device(chip);
err_init:
	return ret;
}

static int lp5562_remove(struct i2c_client *client)
{
	struct lp55xx_led *led = i2c_get_clientdata(client);
	struct lp55xx_chip *chip = led->chip;

	lp5562_stop_engine(chip);

	lp55xx_unregister_sysfs(chip);
	lp55xx_unregister_leds(led, chip);
	lp55xx_deinit_device(chip);

	return 0;
}

static const struct i2c_device_id lp5562_id[] = {
	{ "lp5562", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lp5562_id);

#ifdef CONFIG_OF
static const struct of_device_id of_lp5562_leds_match[] = {
	{ .compatible = "ti,lp5562", },
	{},
};

MODULE_DEVICE_TABLE(of, of_lp5562_leds_match);
#endif

static struct i2c_driver lp5562_driver = {
	.driver = {
		.name	= "lp5562",
		.of_match_table = of_match_ptr(of_lp5562_leds_match),
	},
	.probe		= lp5562_probe,
	.remove		= lp5562_remove,
	.id_table	= lp5562_id,
};

module_i2c_driver(lp5562_driver);

MODULE_DESCRIPTION("Texas Instruments LP5562 LED Driver");
MODULE_AUTHOR("Milo Kim");
MODULE_LICENSE("GPL");