1 // SPDX-License-Identifier: GPL-2.0
3  * Awinic AW20036/AW20054/AW20072 LED driver
22 #define AW200XX_DIM_MAX                  (BIT(6) - 1)
23 #define AW200XX_FADE_MAX                 (BIT(8) - 1)
40 	AW200XX_REG(AW200XX_NUM_PAGES - 1, AW200XX_PAGE_SIZE - 1)
60 /* Global current configuration register */
75 	((x) + (((x) / (columns)) * (AW200XX_DSIZE_COLUMNS_MAX - (columns))))
77 /* DIM current configuration register on page 1 */
82  * DIM current configuration register (page 4).
83  * The even address for current DIM configuration.
84  * The odd address for current FADE configuration
126 	struct aw200xx_led *led = container_of(cdev, struct aw200xx_led, cdev);  in dim_show()  local
127 	int dim = led->dim;  in dim_show()
139 	struct aw200xx_led *led = container_of(cdev, struct aw200xx_led, cdev);  in dim_store()  local
140 	struct aw200xx *chip = led->chip;  in dim_store()
141 	u32 columns = chip->cdef->display_size_columns;  in dim_store()
146 		dim = -1;  in dim_store()
153 			return -EINVAL;  in dim_store()
156 	mutex_lock(&chip->mutex);  in dim_store()
159 		ret = regmap_write(chip->regmap,  in dim_store()
160 				   AW200XX_REG_DIM_PAGE1(led->num, columns),  in dim_store()
166 	led->dim = dim;  in dim_store()
170 	mutex_unlock(&chip->mutex);  in dim_store()
184 	struct aw200xx_led *led = container_of(cdev, struct aw200xx_led, cdev);  in aw200xx_brightness_set()  local
185 	struct aw200xx *chip = led->chip;  in aw200xx_brightness_set()
190 	mutex_lock(&chip->mutex);  in aw200xx_brightness_set()
192 	reg = AW200XX_REG_DIM(led->num, chip->cdef->display_size_columns);  in aw200xx_brightness_set()
194 	dim = led->dim;  in aw200xx_brightness_set()
200 	ret = regmap_write(chip->regmap, reg, dim);  in aw200xx_brightness_set()
204 	ret = regmap_write(chip->regmap,  in aw200xx_brightness_set()
208 	mutex_unlock(&chip->mutex);  in aw200xx_brightness_set()
219 	 * The output current of each LED (see p.14 of datasheet for formula):  in aw200xx_imax_from_global()
229 	led_imax_uA = global_imax_uA * AW200XX_DUTY_RATIO(chip->display_rows);  in aw200xx_imax_from_global()
238 	u32 duty = AW200XX_DUTY_RATIO(chip->display_rows);  in aw200xx_imax_to_global()
240 	/* The output current of each LED (see p.14 of datasheet for formula) */  in aw200xx_imax_to_global()
250  * The AW200XX has a 4-bit register (GCCR) to configure the global current,
252  * of the global current, divided into two parts:
254  * +-----------+-----------------+-----------+-----------------+
256  * +-----------+-----------------+-----------+-----------------+
265  * +-----------+-----------------+-----------+-----------------+
269  * So we have two formulas to calculate the global current:
307 		return -EINVAL;  in aw200xx_set_imax()
309 	return regmap_update_bits(chip->regmap, AW200XX_REG_GCCR,  in aw200xx_set_imax()
318 	ret = regmap_write(chip->regmap, AW200XX_REG_RSTR, AW200XX_RSTR_RESET);  in aw200xx_chip_reset()
322 	regcache_mark_dirty(chip->regmap);  in aw200xx_chip_reset()
323 	return regmap_write(chip->regmap, AW200XX_REG_FCD, AW200XX_FCD_CLEAR);  in aw200xx_chip_reset()
330 	ret = regmap_write(chip->regmap, AW200XX_REG_DSIZE,  in aw200xx_chip_init()
331 			   chip->display_rows - 1);  in aw200xx_chip_init()
335 	ret = regmap_write(chip->regmap, AW200XX_REG_SLPCR,  in aw200xx_chip_init()
340 	return regmap_update_bits(chip->regmap, AW200XX_REG_GCCR,  in aw200xx_chip_init()
346 	struct device *dev = &chip->client->dev;  in aw200xx_chip_check()
350 	ret = regmap_read(chip->regmap, AW200XX_REG_IDR, &chipid);  in aw200xx_chip_check()
355 		return dev_err_probe(dev, -ENODEV,  in aw200xx_chip_check()
368 	ret = device_property_read_u32(dev, "awinic,display-rows",  in aw200xx_probe_fw()
369 				       &chip->display_rows);  in aw200xx_probe_fw()
372 				     "Failed to read 'display-rows' property\n");  in aw200xx_probe_fw()
374 	if (!chip->display_rows ||  in aw200xx_probe_fw()
375 	    chip->display_rows > chip->cdef->display_size_rows_max) {  in aw200xx_probe_fw()
376 		return dev_err_probe(dev, -EINVAL,  in aw200xx_probe_fw()
378 				     chip->display_rows);  in aw200xx_probe_fw()
388 		struct aw200xx_led *led;  in aw200xx_probe_fw()  local
394 			chip->num_leds--;  in aw200xx_probe_fw()
398 		if (source >= chip->cdef->channels) {  in aw200xx_probe_fw()
399 			dev_err(dev, "LED reg %u out of range (max %u)\n",  in aw200xx_probe_fw()
400 				source, chip->cdef->channels);  in aw200xx_probe_fw()
401 			chip->num_leds--;  in aw200xx_probe_fw()
405 		ret = fwnode_property_read_u32(child, "led-max-microamp",  in aw200xx_probe_fw()
408 			dev_info(&chip->client->dev,  in aw200xx_probe_fw()
409 				 "DT property led-max-microamp is missing\n");  in aw200xx_probe_fw()
411 			dev_err(dev, "Invalid value %u for led-max-microamp\n",  in aw200xx_probe_fw()
413 			chip->num_leds--;  in aw200xx_probe_fw()
419 		led = &chip->leds[i];  in aw200xx_probe_fw()
420 		led->dim = -1;  in aw200xx_probe_fw()
421 		led->num = source;  in aw200xx_probe_fw()
422 		led->chip = chip;  in aw200xx_probe_fw()
423 		led->cdev.brightness_set_blocking = aw200xx_brightness_set;  in aw200xx_probe_fw()
424 		led->cdev.groups = dim_groups;  in aw200xx_probe_fw()
427 		ret = devm_led_classdev_register_ext(dev, &led->cdev,  in aw200xx_probe_fw()
437 	if (!chip->num_leds)  in aw200xx_probe_fw()
438 		return -EINVAL;  in aw200xx_probe_fw()
497 	cdef = device_get_match_data(&client->dev);  in aw200xx_probe()
499 		return -ENODEV;  in aw200xx_probe()
501 	count = device_get_child_node_count(&client->dev);  in aw200xx_probe()
502 	if (!count || count > cdef->channels)  in aw200xx_probe()
503 		return dev_err_probe(&client->dev, -EINVAL,  in aw200xx_probe()
506 	chip = devm_kzalloc(&client->dev, struct_size(chip, leds, count),  in aw200xx_probe()
509 		return -ENOMEM;  in aw200xx_probe()
511 	chip->cdef = cdef;  in aw200xx_probe()
512 	chip->num_leds = count;  in aw200xx_probe()
513 	chip->client = client;  in aw200xx_probe()
516 	chip->regmap = devm_regmap_init_i2c(client, &aw200xx_regmap_config);  in aw200xx_probe()
517 	if (IS_ERR(chip->regmap))  in aw200xx_probe()
518 		return PTR_ERR(chip->regmap);  in aw200xx_probe()
524 	mutex_init(&chip->mutex);  in aw200xx_probe()
527 	mutex_lock(&chip->mutex);  in aw200xx_probe()
533 	ret = aw200xx_probe_fw(&client->dev, chip);  in aw200xx_probe()
540 	mutex_unlock(&chip->mutex);  in aw200xx_probe()
549 	mutex_destroy(&chip->mutex);  in aw200xx_remove()
598 MODULE_DESCRIPTION("AW200XX LED driver");