1 // SPDX-License-Identifier: GPL-2.0-only
3  * drivers/leds/leds-as3645a.c - AS3645A and LM3555 flash controllers driver
5  * Copyright (C) 2008-2011 Nokia Corporation
16 #include <linux/led-class-flash.h>
23 #include <media/v4l2-flash-led-class.h>
25 #define AS_TIMER_US_TO_CODE(t)			(((t) / 1000 - 100) / 50)
30 /* Read-only Design info register: Reset state: xxxx 0001 */
35 /* Read-only Version control register: Reset state: 0000 0000
48 /* Read / Write	(Current set register): Reset state: 0110 1001 */
74 /* Boost register */
79 /* Password register is used to unlock boost register writing */
105 	((min_t(u32, AS_PEAK_mA_MAX, a) - 1250) / 250)
158 	struct i2c_client *client = flash->client;  in as3645a_write()
163 	dev_dbg(&client->dev, "Write Addr:%02X Val:%02X %s\n", addr, val,  in as3645a_write()
172 	struct i2c_client *client = flash->client;  in as3645a_read()
177 	dev_dbg(&client->dev, "Read Addr:%02X Val:%02X %s\n", addr, rval,  in as3645a_read()
183 /* -----------------------------------------------------------------------------
188  * as3645a_set_current - Set flash configuration registers
201 	val = (flash->flash_current << AS_CURRENT_FLASH_CURRENT_SHIFT)  in as3645a_set_current()
202 	    | (flash->assist_current << AS_CURRENT_ASSIST_LIGHT_SHIFT)  in as3645a_set_current()
212 	val = flash->timeout << AS_INDICATOR_AND_TIMER_TIMEOUT_SHIFT;  in as3645a_set_timeout()
214 	val |= (flash->cfg.voltage_reference  in as3645a_set_timeout()
216 	    |  ((flash->indicator_current ? flash->indicator_current - 1 : 0)  in as3645a_set_timeout()
223  * as3645a_set_control - Set flash control register
239 	reg = (flash->cfg.peak << AS_CONTROL_COIL_PEAK_SHIFT)  in as3645a_set_control()
244 	    flash->strobe_source == V4L2_FLASH_STROBE_SOURCE_EXTERNAL)  in as3645a_set_control()
267 	dev_dbg(&flash->client->dev, "%u connected LEDs\n",  in as3645a_get_fault()
295 	return (val - min) / step;  in __as3645a_current_to_reg()
303 						flash->cfg.assist_max_ua,  in as3645a_current_to_reg()
307 						flash->cfg.flash_max_ua,  in as3645a_current_to_reg()
317 	flash->indicator_current = brightness;  in as3645a_set_indicator_brightness()
335 		flash->assist_current = brightness - 1;  in as3645a_set_assist_brightness()
350 	flash->flash_current = as3645a_current_to_reg(flash, true,  in as3645a_set_flash_brightness()
361 	flash->timeout = AS_TIMER_US_TO_CODE(timeout_us);  in as3645a_set_flash_timeout()
382 	struct device *dev = &flash->client->dev;  in as3645a_setup()
406 	rval = as3645a_get_fault(&flash->fled, &fault);  in as3645a_setup()
417 	return rval & ~AS_FAULT_INFO_LED_AMOUNT ? -EIO : 0;  in as3645a_setup()
422 	struct device *dev = &flash->client->dev;  in as3645a_detect()
448 		return -ENODEV;  in as3645a_detect()
483 	struct as3645a_config *cfg = &flash->cfg;  in as3645a_parse_node()
493 			flash->flash_node = child;  in as3645a_parse_node()
497 			flash->indicator_node = child;  in as3645a_parse_node()
501 			dev_warn(&flash->client->dev,  in as3645a_parse_node()
507 	if (!flash->flash_node) {  in as3645a_parse_node()
508 		dev_err(&flash->client->dev, "can't find flash node\n");  in as3645a_parse_node()
509 		return -ENODEV;  in as3645a_parse_node()
512 	rval = fwnode_property_read_u32(flash->flash_node, "flash-timeout-us",  in as3645a_parse_node()
513 					&cfg->flash_timeout_us);  in as3645a_parse_node()
515 		dev_err(&flash->client->dev,  in as3645a_parse_node()
516 			"can't read flash-timeout-us property for flash\n");  in as3645a_parse_node()
520 	rval = fwnode_property_read_u32(flash->flash_node, "flash-max-microamp",  in as3645a_parse_node()
521 					&cfg->flash_max_ua);  in as3645a_parse_node()
523 		dev_err(&flash->client->dev,  in as3645a_parse_node()
524 			"can't read flash-max-microamp property for flash\n");  in as3645a_parse_node()
528 	rval = fwnode_property_read_u32(flash->flash_node, "led-max-microamp",  in as3645a_parse_node()
529 					&cfg->assist_max_ua);  in as3645a_parse_node()
531 		dev_err(&flash->client->dev,  in as3645a_parse_node()
532 			"can't read led-max-microamp property for flash\n");  in as3645a_parse_node()
536 	fwnode_property_read_u32(flash->flash_node, "voltage-reference",  in as3645a_parse_node()
537 				 &cfg->voltage_reference);  in as3645a_parse_node()
539 	fwnode_property_read_u32(flash->flash_node, "ams,input-max-microamp",  in as3645a_parse_node()
540 				 &cfg->peak);  in as3645a_parse_node()
541 	cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);  in as3645a_parse_node()
543 	if (!flash->indicator_node) {  in as3645a_parse_node()
544 		dev_warn(&flash->client->dev,  in as3645a_parse_node()
546 		rval = -ENODEV;  in as3645a_parse_node()
551 	rval = fwnode_property_read_u32(flash->indicator_node,  in as3645a_parse_node()
552 					"led-max-microamp",  in as3645a_parse_node()
553 					&cfg->indicator_max_ua);  in as3645a_parse_node()
555 		dev_err(&flash->client->dev,  in as3645a_parse_node()
556 			"can't read led-max-microamp property for indicator\n");  in as3645a_parse_node()
563 	fwnode_handle_put(flash->flash_node);  in as3645a_parse_node()
564 	fwnode_handle_put(flash->indicator_node);  in as3645a_parse_node()
571 	struct led_classdev *fled_cdev = &flash->fled.led_cdev;  in as3645a_led_class_setup()
572 	struct led_classdev *iled_cdev = &flash->iled_cdev;  in as3645a_led_class_setup()
577 	iled_cdev->brightness_set_blocking = as3645a_set_indicator_brightness;  in as3645a_led_class_setup()
578 	iled_cdev->max_brightness =  in as3645a_led_class_setup()
579 		flash->cfg.indicator_max_ua / AS_INDICATOR_INTENSITY_STEP;  in as3645a_led_class_setup()
580 	iled_cdev->flags = LED_CORE_SUSPENDRESUME;  in as3645a_led_class_setup()
582 	init_data.fwnode = flash->indicator_node;  in as3645a_led_class_setup()
586 	rval = led_classdev_register_ext(&flash->client->dev, iled_cdev,  in as3645a_led_class_setup()
591 	cfg = &flash->fled.brightness;  in as3645a_led_class_setup()
592 	cfg->min = AS_FLASH_INTENSITY_MIN;  in as3645a_led_class_setup()
593 	cfg->max = flash->cfg.flash_max_ua;  in as3645a_led_class_setup()
594 	cfg->step = AS_FLASH_INTENSITY_STEP;  in as3645a_led_class_setup()
595 	cfg->val = flash->cfg.flash_max_ua;  in as3645a_led_class_setup()
597 	cfg = &flash->fled.timeout;  in as3645a_led_class_setup()
598 	cfg->min = AS_FLASH_TIMEOUT_MIN;  in as3645a_led_class_setup()
599 	cfg->max = flash->cfg.flash_timeout_us;  in as3645a_led_class_setup()
600 	cfg->step = AS_FLASH_TIMEOUT_STEP;  in as3645a_led_class_setup()
601 	cfg->val = flash->cfg.flash_timeout_us;  in as3645a_led_class_setup()
603 	flash->fled.ops = &as3645a_led_flash_ops;  in as3645a_led_class_setup()
605 	fled_cdev->brightness_set_blocking = as3645a_set_assist_brightness;  in as3645a_led_class_setup()
607 	fled_cdev->max_brightness =  in as3645a_led_class_setup()
609 				       flash->cfg.assist_max_ua) + 1;  in as3645a_led_class_setup()
610 	fled_cdev->flags = LED_DEV_CAP_FLASH | LED_CORE_SUSPENDRESUME;  in as3645a_led_class_setup()
612 	init_data.fwnode = flash->flash_node;  in as3645a_led_class_setup()
616 	rval = led_classdev_flash_register_ext(&flash->client->dev,  in as3645a_led_class_setup()
617 					       &flash->fled, &init_data);  in as3645a_led_class_setup()
625 	dev_err(&flash->client->dev,  in as3645a_led_class_setup()
633 	struct led_classdev_flash *fled = &flash->fled;  in as3645a_v4l2_setup()
634 	struct led_classdev *led = &fled->led_cdev;  in as3645a_v4l2_setup()
638 			.max = flash->cfg.assist_max_ua,  in as3645a_v4l2_setup()
640 			.val = flash->cfg.assist_max_ua,  in as3645a_v4l2_setup()
646 			.max = flash->cfg.indicator_max_ua,  in as3645a_v4l2_setup()
648 			.val = flash->cfg.indicator_max_ua,  in as3645a_v4l2_setup()
652 	strscpy(cfg.dev_name, led->dev->kobj.name, sizeof(cfg.dev_name));  in as3645a_v4l2_setup()
653 	strscpy(cfgind.dev_name, flash->iled_cdev.dev->kobj.name,  in as3645a_v4l2_setup()
656 	flash->vf = v4l2_flash_init(  in as3645a_v4l2_setup()
657 		&flash->client->dev, flash->flash_node, &flash->fled, NULL,  in as3645a_v4l2_setup()
659 	if (IS_ERR(flash->vf))  in as3645a_v4l2_setup()
660 		return PTR_ERR(flash->vf);  in as3645a_v4l2_setup()
662 	flash->vfind = v4l2_flash_indicator_init(  in as3645a_v4l2_setup()
663 		&flash->client->dev, flash->indicator_node, &flash->iled_cdev,  in as3645a_v4l2_setup()
665 	if (IS_ERR(flash->vfind)) {  in as3645a_v4l2_setup()
666 		v4l2_flash_release(flash->vf);  in as3645a_v4l2_setup()
667 		return PTR_ERR(flash->vfind);  in as3645a_v4l2_setup()
678 	if (!dev_fwnode(&client->dev))  in as3645a_probe()
679 		return -ENODEV;  in as3645a_probe()
681 	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);  in as3645a_probe()
683 		return -ENOMEM;  in as3645a_probe()
685 	flash->client = client;  in as3645a_probe()
687 	rval = as3645a_parse_node(&client->dev, flash);  in as3645a_probe()
695 	mutex_init(&flash->mutex);  in as3645a_probe()
713 	led_classdev_flash_unregister(&flash->fled);  in as3645a_probe()
716 	mutex_destroy(&flash->mutex);  in as3645a_probe()
719 	fwnode_handle_put(flash->flash_node);  in as3645a_probe()
720 	fwnode_handle_put(flash->indicator_node);  in as3645a_probe()
731 	v4l2_flash_release(flash->vf);  in as3645a_remove()
732 	v4l2_flash_release(flash->vfind);  in as3645a_remove()
734 	led_classdev_flash_unregister(&flash->fled);  in as3645a_remove()
735 	led_classdev_unregister(&flash->iled_cdev);  in as3645a_remove()
737 	mutex_destroy(&flash->mutex);  in as3645a_remove()
739 	fwnode_handle_put(flash->flash_node);  in as3645a_remove()
740 	fwnode_handle_put(flash->indicator_node);  in as3645a_remove()