1 // SPDX-License-Identifier: GPL-2.0-only
3  * LP5521 LED chip driver.
18 #include <linux/platform_data/leds-lp55xx.h>
22 #include "leds-lp55xx-common.h"
44 /* Base register to set LED current */
60 #define LP5521_PWRSAVE_EN		0x20	/* 1 = Power save mode */
61 #define LP5521_CP_MODE_MASK		0x18	/* Charge pump mode */
77 #define LP5521_MODE_R_M			0x30	/* Operation Mode Register */
84 #define LP5521_R_IS_LOADING(mode)	\  argument
85 	((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
86 #define LP5521_G_IS_LOADING(mode)	\  argument
87 	((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
88 #define LP5521_B_IS_LOADING(mode)	\  argument
89 	((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
101 	/* operation mode change needs to be longer than 153 us */  in lp5521_wait_opmode_done()
111 static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)  in lp5521_set_led_current()  argument
113 	led->led_current = led_current;  in lp5521_set_led_current()
114 	lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,  in lp5521_set_led_current()
120 	enum lp55xx_engine_index idx = chip->engine_idx;  in lp5521_load_engine()
146 	enum lp55xx_engine_index idx = chip->engine_idx;  in lp5521_stop_engine()
161 	u8 mode;  in lp5521_run_engine()  local
174 	 * operation mode and enable register should updated at the same time  in lp5521_run_engine()
177 	ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);  in lp5521_run_engine()
185 	/* change operation mode to RUN only when each engine is loading */  in lp5521_run_engine()
186 	if (LP5521_R_IS_LOADING(mode)) {  in lp5521_run_engine()
187 		mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;  in lp5521_run_engine()
191 	if (LP5521_G_IS_LOADING(mode)) {  in lp5521_run_engine()
192 		mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;  in lp5521_run_engine()
196 	if (LP5521_B_IS_LOADING(mode)) {  in lp5521_run_engine()
197 		mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;  in lp5521_run_engine()
201 	lp55xx_write(chip, LP5521_REG_OP_MODE, mode);  in lp5521_run_engine()
211 	enum lp55xx_engine_index idx = chip->engine_idx;  in lp5521_update_program_memory()
225 	while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {  in lp5521_update_program_memory()
247 			return -EINVAL;  in lp5521_update_program_memory()
253 	dev_err(&chip->cl->dev, "wrong pattern format\n");  in lp5521_update_program_memory()
254 	return -EINVAL;  in lp5521_update_program_memory()
259 	const struct firmware *fw = chip->fw;  in lp5521_firmware_loaded()
261 	if (fw->size > LP5521_PROGRAM_LENGTH) {  in lp5521_firmware_loaded()
262 		dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",  in lp5521_firmware_loaded()
263 			fw->size);  in lp5521_firmware_loaded()
269 	 *  1) set engine mode to "LOAD"  in lp5521_firmware_loaded()
274 	lp5521_update_program_memory(chip, fw->data, fw->size);  in lp5521_firmware_loaded()
284 	 * current reg. This is dummy read is required on some platforms -  in lp5521_post_init_device()
286 	 * LP5521_REG_ENABLE register will not have any effect - strange!  in lp5521_post_init_device()
290 		dev_err(&chip->cl->dev, "error in resetting chip\n");  in lp5521_post_init_device()
294 		dev_err(&chip->cl->dev,  in lp5521_post_init_device()
297 		ret = -EINVAL;  in lp5521_post_init_device()
302 	/* Set all PWMs to direct control mode */  in lp5521_post_init_device()
310 	val |= (chip->pdata->charge_pump_mode << LP5521_CP_MODE_SHIFT) & LP5521_CP_MODE_MASK;  in lp5521_post_init_device()
316 	/* Initialize all channels PWM to zero -> leds off */  in lp5521_post_init_device()
333 	struct lp55xx_platform_data *pdata = chip->pdata;  in lp5521_run_selftest()
341 	if (pdata->clock_mode != LP55XX_CLOCK_EXT)  in lp5521_run_selftest()
346 		return -EIO;  in lp5521_run_selftest()
351 static int lp5521_multicolor_brightness(struct lp55xx_led *led)  in lp5521_multicolor_brightness()  argument
353 	struct lp55xx_chip *chip = led->chip;  in lp5521_multicolor_brightness()
357 	mutex_lock(&chip->lock);  in lp5521_multicolor_brightness()
358 	for (i = 0; i < led->mc_cdev.num_colors; i++) {  in lp5521_multicolor_brightness()
361 				   led->mc_cdev.subled_info[i].channel,  in lp5521_multicolor_brightness()
362 				   led->mc_cdev.subled_info[i].brightness);  in lp5521_multicolor_brightness()
366 	mutex_unlock(&chip->lock);  in lp5521_multicolor_brightness()
370 static int lp5521_led_brightness(struct lp55xx_led *led)  in lp5521_led_brightness()  argument
372 	struct lp55xx_chip *chip = led->chip;  in lp5521_led_brightness()
375 	mutex_lock(&chip->lock);  in lp5521_led_brightness()
376 	ret = lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,  in lp5521_led_brightness()
377 		led->brightness);  in lp5521_led_brightness()
378 	mutex_unlock(&chip->lock);  in lp5521_led_brightness()
387 	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));  in show_engine_mode()  local
388 	struct lp55xx_chip *chip = led->chip;  in show_engine_mode()
389 	enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;  in show_engine_mode()  local
391 	switch (mode) {  in show_engine_mode()
409 	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));  in store_engine_mode()  local
410 	struct lp55xx_chip *chip = led->chip;  in store_engine_mode()
411 	struct lp55xx_engine *engine = &chip->engines[nr - 1];  in store_engine_mode()
413 	mutex_lock(&chip->lock);  in store_engine_mode()
415 	chip->engine_idx = nr;  in store_engine_mode()
419 		engine->mode = LP55XX_ENGINE_RUN;  in store_engine_mode()
423 		engine->mode = LP55XX_ENGINE_LOAD;  in store_engine_mode()
426 		engine->mode = LP55XX_ENGINE_DISABLED;  in store_engine_mode()
429 	mutex_unlock(&chip->lock);  in store_engine_mode()
441 	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));  in store_engine_load()  local
442 	struct lp55xx_chip *chip = led->chip;  in store_engine_load()
445 	mutex_lock(&chip->lock);  in store_engine_load()
447 	chip->engine_idx = nr;  in store_engine_load()
451 	mutex_unlock(&chip->lock);  in store_engine_load()
463 	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));  in lp5521_selftest()  local
464 	struct lp55xx_chip *chip = led->chip;  in lp5521_selftest()
467 	mutex_lock(&chip->lock);  in lp5521_selftest()
469 	mutex_unlock(&chip->lock);  in lp5521_selftest()
523 	struct lp55xx_led *led;  in lp5521_probe()  local
524 	struct lp55xx_platform_data *pdata = dev_get_platdata(&client->dev);  in lp5521_probe()
525 	struct device_node *np = dev_of_node(&client->dev);  in lp5521_probe()
527 	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);  in lp5521_probe()
529 		return -ENOMEM;  in lp5521_probe()
531 	chip->cfg = &lp5521_cfg;  in lp5521_probe()
535 			pdata = lp55xx_of_populate_pdata(&client->dev, np,  in lp5521_probe()
540 			dev_err(&client->dev, "no platform data\n");  in lp5521_probe()
541 			return -EINVAL;  in lp5521_probe()
545 	led = devm_kcalloc(&client->dev,  in lp5521_probe()
546 			pdata->num_channels, sizeof(*led), GFP_KERNEL);  in lp5521_probe()
547 	if (!led)  in lp5521_probe()
548 		return -ENOMEM;  in lp5521_probe()
550 	chip->cl = client;  in lp5521_probe()
551 	chip->pdata = pdata;  in lp5521_probe()
553 	mutex_init(&chip->lock);  in lp5521_probe()
555 	i2c_set_clientdata(client, led);  in lp5521_probe()
561 	dev_info(&client->dev, "%s programmable led chip found\n", id->name);  in lp5521_probe()
563 	ret = lp55xx_register_leds(led, chip);  in lp5521_probe()
569 		dev_err(&client->dev, "registering sysfs failed\n");  in lp5521_probe()
583 	struct lp55xx_led *led = i2c_get_clientdata(client);  in lp5521_remove()  local
584 	struct lp55xx_chip *chip = led->chip;  in lp5521_remove()
618 MODULE_DESCRIPTION("LP5521 LED engine");