1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * Driver for BCM6328 memory-mapped LEDs, based on leds-syscon.c
59  * struct bcm6328_led - state container for bcm6328 based LEDs
60  * @cdev: LED class device for this LED
63  * @pin: LED pin number
66  * @active_low: LED is active low
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()
110 static void bcm6328_led_mode(struct bcm6328_led *led, unsigned long value)  in bcm6328_led_mode()  argument
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()
130 	struct bcm6328_led *led =  in bcm6328_led_set()  local
134 	spin_lock_irqsave(led->lock, flags);  in bcm6328_led_set()
136 	/* Remove LED from cached HW blinking intervals */  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()
140 	/* Set LED on/off */  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()
143 		bcm6328_led_mode(led, BCM6328_LED_MODE_ON);  in bcm6328_led_set()
145 		bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);  in bcm6328_led_set()
147 	spin_unlock_irqrestore(led->lock, flags);  in bcm6328_led_set()
165 	struct bcm6328_led *led =  in bcm6328_blink_set()  local
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()
194 	 *   2. Only this LED is assigned to the HW blinking interval.  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()
202 		/* Add LED to the first HW blinking interval cache */  in bcm6328_blink_set()
203 		led->blink_leds[0] |= BIT(led->pin);  in bcm6328_blink_set()
205 		/* Remove LED from the second HW blinking interval cache */  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()
217 		/* Set the LED to first HW blinking interval */  in bcm6328_blink_set()
218 		bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK1);  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()
226 		/* Remove LED from the first HW blinking interval */  in bcm6328_blink_set()
227 		led->blink_leds[0] &= ~BIT(led->pin);  in bcm6328_blink_set()
229 		/* Add LED to the second HW blinking interval */  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()
241 		/* Set the LED to second HW blinking interval */  in bcm6328_blink_set()
242 		bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK2);  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()
332 	struct bcm6328_led *led;  in bcm6328_led()  local
336 	led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);  in bcm6328_led()
337 	if (!led)  in bcm6328_led()
338 		return -ENOMEM;  in bcm6328_led()
340 	led->pin = reg;  in bcm6328_led()
341 	led->mem = mem;  in bcm6328_led()
342 	led->lock = lock;  in bcm6328_led()
343 	led->blink_leds = blink_leds;  in bcm6328_led()
344 	led->blink_delay = blink_delay;  in bcm6328_led()
346 	if (of_property_read_bool(nc, "active-low"))  in bcm6328_led()
347 		led->active_low = true;  in bcm6328_led()
349 	if (!of_property_read_string(nc, "default-state", &state)) {  in bcm6328_led()
351 			led->cdev.brightness = LED_FULL;  in bcm6328_led()
356 			shift = bcm6328_pin2shift(led->pin);  in bcm6328_led()
365 			if ((led->active_low && val == BCM6328_LED_MODE_OFF) ||  in bcm6328_led()
366 			    (!led->active_low && val == BCM6328_LED_MODE_ON))  in bcm6328_led()
367 				led->cdev.brightness = LED_FULL;  in bcm6328_led()
369 				led->cdev.brightness = LED_OFF;  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()
383 	rc = devm_led_classdev_register_ext(dev, &led->cdev, &init_data);  in bcm6328_led()
387 	dev_dbg(dev, "registered LED %s\n", led->cdev.name);  in bcm6328_led()
394 	struct device *dev = &pdev->dev;  in bcm6328_leds_probe()
395 	struct device_node *np = dev_of_node(&pdev->dev);  in bcm6328_leds_probe()
407 		return -ENOMEM;  in bcm6328_leds_probe()
412 		return -ENOMEM;  in bcm6328_leds_probe()
417 		return -ENOMEM;  in bcm6328_leds_probe()
427 	if (of_property_read_bool(np, "brcm,serial-leds"))  in bcm6328_leds_probe()
429 	if (of_property_read_bool(np, "brcm,serial-mux"))  in bcm6328_leds_probe()
431 	if (of_property_read_bool(np, "brcm,serial-clk-low"))  in bcm6328_leds_probe()
433 	if (!of_property_read_bool(np, "brcm,serial-dat-low"))  in bcm6328_leds_probe()
435 	if (!of_property_read_bool(np, "brcm,serial-shift-inv"))  in bcm6328_leds_probe()
447 			dev_err(dev, "invalid LED (%u >= %d)\n", reg,  in bcm6328_leds_probe()
452 		if (of_property_read_bool(child, "brcm,hardware-controlled"))  in bcm6328_leds_probe()
468 	{ .compatible = "brcm,bcm6328-leds", },
476 		.name = "leds-bcm6328",
485 MODULE_DESCRIPTION("LED driver for BCM6328 controllers");
487 MODULE_ALIAS("platform:leds-bcm6328");