1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Driver for BCM6328 memory-mapped LEDs, based on leds-syscon.c
9 #include <linux/leds.h>
59  * struct bcm6328_led - state container for bcm6328 based LEDs
64  * @blink_leds: blinking LEDs
97  * LEDMode 64 bits / 24 LEDs
98  * bits [31:0] -> LEDs 8-23
99  * bits [47:32] -> LEDs 0-7
100  * bits [63:48] -> unused
105 		return pin + 16; /* LEDs 0-7 (bits 47:32) */  in bcm6328_pin2shift()
107 		return pin - 8; /* LEDs 8-23 (bits 31:0) */  in bcm6328_pin2shift()
115 	shift = bcm6328_pin2shift(led->pin);  in bcm6328_led_mode()
117 		mode = led->mem + BCM6328_REG_MODE_HI;  in bcm6328_led_mode()
119 		mode = led->mem + BCM6328_REG_MODE_LO;  in bcm6328_led_mode()
134 	spin_lock_irqsave(led->lock, flags);  in bcm6328_led_set()
137 	led->blink_leds[0] &= ~BIT(led->pin);  in bcm6328_led_set()
138 	led->blink_leds[1] &= ~BIT(led->pin);  in bcm6328_led_set()
141 	if ((led->active_low && value == LED_OFF) ||  in bcm6328_led_set()
142 	    (!led->active_low && value != LED_OFF))  in bcm6328_led_set()
147 	spin_unlock_irqrestore(led->lock, flags);  in bcm6328_led_set()
177 		dev_dbg(led_cdev->dev,  in bcm6328_blink_set()
179 		return -EINVAL;  in bcm6328_blink_set()
183 		dev_dbg(led_cdev->dev,  in bcm6328_blink_set()
186 		return -EINVAL;  in bcm6328_blink_set()
189 	spin_lock_irqsave(led->lock, flags);  in bcm6328_blink_set()
193 	 *   1. No LEDs assigned to the HW blinking interval.  in bcm6328_blink_set()
195 	 *   3. LEDs with the same delay assigned.  in bcm6328_blink_set()
197 	if (led->blink_leds[0] == 0 ||  in bcm6328_blink_set()
198 	    led->blink_leds[0] == BIT(led->pin) ||  in bcm6328_blink_set()
199 	    led->blink_delay[0] == delay) {  in bcm6328_blink_set()
203 		led->blink_leds[0] |= BIT(led->pin);  in bcm6328_blink_set()
206 		led->blink_leds[1] &= ~BIT(led->pin);  in bcm6328_blink_set()
209 		led->blink_delay[0] = delay;  in bcm6328_blink_set()
212 		val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);  in bcm6328_blink_set()
215 		bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);  in bcm6328_blink_set()
221 	} else if (led->blink_leds[1] == 0 ||  in bcm6328_blink_set()
222 		   led->blink_leds[1] == BIT(led->pin) ||  in bcm6328_blink_set()
223 		   led->blink_delay[1] == delay) {  in bcm6328_blink_set()
227 		led->blink_leds[0] &= ~BIT(led->pin);  in bcm6328_blink_set()
230 		led->blink_leds[1] |= BIT(led->pin);  in bcm6328_blink_set()
233 		led->blink_delay[1] = delay;  in bcm6328_blink_set()
236 		val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);  in bcm6328_blink_set()
239 		bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);  in bcm6328_blink_set()
246 		dev_dbg(led_cdev->dev,  in bcm6328_blink_set()
248 		rc = -EINVAL;  in bcm6328_blink_set()
250 	spin_unlock_irqrestore(led->lock, flags);  in bcm6328_blink_set()
267 	/* Only LEDs 0-7 can be activity/link controlled */  in bcm6328_hwled()
271 	cnt = of_property_count_elems_of_size(nc, "brcm,link-signal-sources",  in bcm6328_hwled()
282 		of_property_read_u32_index(nc, "brcm,link-signal-sources", i,  in bcm6328_hwled()
298 					      "brcm,activity-signal-sources",  in bcm6328_hwled()
309 		of_property_read_u32_index(nc, "brcm,activity-signal-sources",  in bcm6328_hwled()
340 		return -ENOMEM;  in bcm6328_led()
342 	led->pin = reg;  in bcm6328_led()
343 	led->mem = mem;  in bcm6328_led()
344 	led->lock = lock;  in bcm6328_led()
345 	led->blink_leds = blink_leds;  in bcm6328_led()
346 	led->blink_delay = blink_delay;  in bcm6328_led()
348 	if (of_property_read_bool(nc, "active-low"))  in bcm6328_led()
349 		led->active_low = true;  in bcm6328_led()
356 		led->cdev.brightness = LED_FULL;  in bcm6328_led()
359 		shift = bcm6328_pin2shift(led->pin);  in bcm6328_led()
367 		if ((led->active_low && val == BCM6328_LED_MODE_OFF) ||  in bcm6328_led()
368 		    (!led->active_low && val == BCM6328_LED_MODE_ON))  in bcm6328_led()
369 			led->cdev.brightness = LED_FULL;  in bcm6328_led()
371 			led->cdev.brightness = LED_OFF;  in bcm6328_led()
374 		led->cdev.brightness = LED_OFF;  in bcm6328_led()
377 	bcm6328_led_set(&led->cdev, led->cdev.brightness);  in bcm6328_led()
379 	led->cdev.brightness_set = bcm6328_led_set;  in bcm6328_led()
380 	led->cdev.blink_set = bcm6328_blink_set;  in bcm6328_led()
382 	rc = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);  in bcm6328_led()
386 	dev_dbg(dev, "registered LED %s\n", led->cdev.name);  in bcm6328_led()
393 	struct device *dev = &pdev->dev;  in bcm6328_leds_probe()
394 	struct device_node *np = dev_of_node(&pdev->dev);  in bcm6328_leds_probe()
405 		return -ENOMEM;  in bcm6328_leds_probe()
410 		return -ENOMEM;  in bcm6328_leds_probe()
415 		return -ENOMEM;  in bcm6328_leds_probe()
425 	if (of_property_read_bool(np, "brcm,serial-leds"))  in bcm6328_leds_probe()
427 	if (of_property_read_bool(np, "brcm,serial-mux"))  in bcm6328_leds_probe()
429 	if (of_property_read_bool(np, "brcm,serial-clk-low"))  in bcm6328_leds_probe()
431 	if (!of_property_read_bool(np, "brcm,serial-dat-low"))  in bcm6328_leds_probe()
433 	if (!of_property_read_bool(np, "brcm,serial-shift-inv"))  in bcm6328_leds_probe()
450 		if (of_property_read_bool(child, "brcm,hardware-controlled"))  in bcm6328_leds_probe()
464 	{ .compatible = "brcm,bcm6328-leds", },
472 		.name = "leds-bcm6328",
481 MODULE_DESCRIPTION("LED driver for BCM6328 controllers");
483 MODULE_ALIAS("platform:leds-bcm6328");