[linux-2.6-block.git] / drivers / leds / leds-bcm6328.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Driver for BCM6328 memory-mapped LEDs, based on leds-syscon.c
 *
 * Copyright 2015 Álvaro Fernández Rojas <noltari@gmail.com>
 * Copyright 2015 Jonas Gorski <jogo@openwrt.org>
 */
#include <linux/io.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>

#define BCM6328_REG_INIT		0x00
#define BCM6328_REG_MODE_HI		0x04
#define BCM6328_REG_MODE_LO		0x08
#define BCM6328_REG_HWDIS		0x0c
#define BCM6328_REG_STROBE		0x10
#define BCM6328_REG_LNKACTSEL_HI	0x14
#define BCM6328_REG_LNKACTSEL_LO	0x18
#define BCM6328_REG_RBACK		0x1c
#define BCM6328_REG_SERMUX		0x20

#define BCM6328_LED_MAX_COUNT		24
#define BCM6328_LED_DEF_DELAY		500
#define BCM6328_LED_INTERVAL_MS		20

#define BCM6328_LED_INTV_MASK		0x3f
#define BCM6328_LED_FAST_INTV_SHIFT	6
#define BCM6328_LED_FAST_INTV_MASK	(BCM6328_LED_INTV_MASK << \
					 BCM6328_LED_FAST_INTV_SHIFT)
#define BCM6328_SERIAL_LED_EN		BIT(12)
#define BCM6328_SERIAL_LED_MUX		BIT(13)
#define BCM6328_SERIAL_LED_CLK_NPOL	BIT(14)
#define BCM6328_SERIAL_LED_DATA_PPOL	BIT(15)
#define BCM6328_SERIAL_LED_SHIFT_DIR	BIT(16)
#define BCM6328_LED_SHIFT_TEST		BIT(30)
#define BCM6328_LED_TEST		BIT(31)
#define BCM6328_INIT_MASK		(BCM6328_SERIAL_LED_EN | \
					 BCM6328_SERIAL_LED_MUX | \
					 BCM6328_SERIAL_LED_CLK_NPOL | \
					 BCM6328_SERIAL_LED_DATA_PPOL | \
					 BCM6328_SERIAL_LED_SHIFT_DIR)

#define BCM6328_LED_MODE_MASK		3
#define BCM6328_LED_MODE_ON		0
#define BCM6328_LED_MODE_FAST		1
#define BCM6328_LED_MODE_BLINK		2
#define BCM6328_LED_MODE_OFF		3
#define BCM6328_LED_SHIFT(X)		((X) << 1)

/**
 * struct bcm6328_led - state container for bcm6328 based LEDs
 * @cdev: LED class device for this LED
 * @mem: memory resource
 * @lock: memory lock
 * @pin: LED pin number
 * @blink_leds: blinking LEDs
 * @blink_delay: blinking delay
 * @active_low: LED is active low
 */
struct bcm6328_led {
	struct led_classdev cdev;
	void __iomem *mem;
	spinlock_t *lock;
	unsigned long pin;
	unsigned long *blink_leds;
	unsigned long *blink_delay;
	bool active_low;
};

static void bcm6328_led_write(void __iomem *reg, unsigned long data)
{
#ifdef CONFIG_CPU_BIG_ENDIAN
	iowrite32be(data, reg);
#else
	writel(data, reg);
#endif
}

static unsigned long bcm6328_led_read(void __iomem *reg)
{
#ifdef CONFIG_CPU_BIG_ENDIAN
	return ioread32be(reg);
#else
	return readl(reg);
#endif
}

/**
 * LEDMode 64 bits / 24 LEDs
 * bits [31:0] -> LEDs 8-23
 * bits [47:32] -> LEDs 0-7
 * bits [63:48] -> unused
 */
static unsigned long bcm6328_pin2shift(unsigned long pin)
{
	if (pin < 8)
		return pin + 16; /* LEDs 0-7 (bits 47:32) */
	else
		return pin - 8; /* LEDs 8-23 (bits 31:0) */
}

static void bcm6328_led_mode(struct bcm6328_led *led, unsigned long value)
{
	void __iomem *mode;
	unsigned long val, shift;

	shift = bcm6328_pin2shift(led->pin);
	if (shift / 16)
		mode = led->mem + BCM6328_REG_MODE_HI;
	else
		mode = led->mem + BCM6328_REG_MODE_LO;

	val = bcm6328_led_read(mode);
	val &= ~(BCM6328_LED_MODE_MASK << BCM6328_LED_SHIFT(shift % 16));
	val |= (value << BCM6328_LED_SHIFT(shift % 16));
	bcm6328_led_write(mode, val);
}

static void bcm6328_led_set(struct led_classdev *led_cdev,
			    enum led_brightness value)
{
	struct bcm6328_led *led =
		container_of(led_cdev, struct bcm6328_led, cdev);
	unsigned long flags;

	spin_lock_irqsave(led->lock, flags);
	*(led->blink_leds) &= ~BIT(led->pin);
	if ((led->active_low && value == LED_OFF) ||
	    (!led->active_low && value != LED_OFF))
		bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
	else
		bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
	spin_unlock_irqrestore(led->lock, flags);
}

static unsigned long bcm6328_blink_delay(unsigned long delay)
{
	unsigned long bcm6328_delay;

	bcm6328_delay = delay + BCM6328_LED_INTERVAL_MS / 2;
	bcm6328_delay = bcm6328_delay / BCM6328_LED_INTERVAL_MS;
	if (bcm6328_delay == 0)
		bcm6328_delay = 1;

	return bcm6328_delay;
}

static int bcm6328_blink_set(struct led_classdev *led_cdev,
			     unsigned long *delay_on, unsigned long *delay_off)
{
	struct bcm6328_led *led =
		container_of(led_cdev, struct bcm6328_led, cdev);
	unsigned long delay, flags;
	int rc;

	if (!*delay_on)
		*delay_on = BCM6328_LED_DEF_DELAY;
	if (!*delay_off)
		*delay_off = BCM6328_LED_DEF_DELAY;

	delay = bcm6328_blink_delay(*delay_on);
	if (delay != bcm6328_blink_delay(*delay_off)) {
		dev_dbg(led_cdev->dev,
			"fallback to soft blinking (delay_on != delay_off)\n");
		return -EINVAL;
	}

	if (delay > BCM6328_LED_INTV_MASK) {
		dev_dbg(led_cdev->dev,
			"fallback to soft blinking (delay > %ums)\n",
			BCM6328_LED_INTV_MASK * BCM6328_LED_INTERVAL_MS);
		return -EINVAL;
	}

	spin_lock_irqsave(led->lock, flags);
	if (*(led->blink_leds) == 0 ||
	    *(led->blink_leds) == BIT(led->pin) ||
	    *(led->blink_delay) == delay) {
		unsigned long val;

		*(led->blink_leds) |= BIT(led->pin);
		*(led->blink_delay) = delay;

		val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
		val &= ~BCM6328_LED_FAST_INTV_MASK;
		val |= (delay << BCM6328_LED_FAST_INTV_SHIFT);
		bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);

		bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK);
		rc = 0;
	} else {
		dev_dbg(led_cdev->dev,
			"fallback to soft blinking (delay already set)\n");
		rc = -EINVAL;
	}
	spin_unlock_irqrestore(led->lock, flags);

	return rc;
}

static int bcm6328_hwled(struct device *dev, struct device_node *nc, u32 reg,
			 void __iomem *mem, spinlock_t *lock)
{
	int i, cnt;
	unsigned long flags, val;

	spin_lock_irqsave(lock, flags);
	val = bcm6328_led_read(mem + BCM6328_REG_HWDIS);
	val &= ~BIT(reg);
	bcm6328_led_write(mem + BCM6328_REG_HWDIS, val);
	spin_unlock_irqrestore(lock, flags);

	/* Only LEDs 0-7 can be activity/link controlled */
	if (reg >= 8)
		return 0;

	cnt = of_property_count_elems_of_size(nc, "brcm,link-signal-sources",
					      sizeof(u32));
	for (i = 0; i < cnt; i++) {
		u32 sel;
		void __iomem *addr;

		if (reg < 4)
			addr = mem + BCM6328_REG_LNKACTSEL_LO;
		else
			addr = mem + BCM6328_REG_LNKACTSEL_HI;

		of_property_read_u32_index(nc, "brcm,link-signal-sources", i,
					   &sel);

		if (reg / 4 != sel / 4) {
			dev_warn(dev, "invalid link signal source\n");
			continue;
		}

		spin_lock_irqsave(lock, flags);
		val = bcm6328_led_read(addr);
		val |= (BIT(reg % 4) << (((sel % 4) * 4) + 16));
		bcm6328_led_write(addr, val);
		spin_unlock_irqrestore(lock, flags);
	}

	cnt = of_property_count_elems_of_size(nc,
					      "brcm,activity-signal-sources",
					      sizeof(u32));
	for (i = 0; i < cnt; i++) {
		u32 sel;
		void __iomem *addr;

		if (reg < 4)
			addr = mem + BCM6328_REG_LNKACTSEL_LO;
		else
			addr = mem + BCM6328_REG_LNKACTSEL_HI;

		of_property_read_u32_index(nc, "brcm,activity-signal-sources",
					   i, &sel);

		if (reg / 4 != sel / 4) {
			dev_warn(dev, "invalid activity signal source\n");
			continue;
		}

		spin_lock_irqsave(lock, flags);
		val = bcm6328_led_read(addr);
		val |= (BIT(reg % 4) << ((sel % 4) * 4));
		bcm6328_led_write(addr, val);
		spin_unlock_irqrestore(lock, flags);
	}

	return 0;
}

static int bcm6328_led(struct device *dev, struct device_node *nc, u32 reg,
		       void __iomem *mem, spinlock_t *lock,
		       unsigned long *blink_leds, unsigned long *blink_delay)
{
	struct bcm6328_led *led;
	const char *state;
	int rc;

	led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
	if (!led)
		return -ENOMEM;

	led->pin = reg;
	led->mem = mem;
	led->lock = lock;
	led->blink_leds = blink_leds;
	led->blink_delay = blink_delay;

	if (of_property_read_bool(nc, "active-low"))
		led->active_low = true;

	led->cdev.name = of_get_property(nc, "label", NULL) ? : nc->name;
	led->cdev.default_trigger = of_get_property(nc,
						    "linux,default-trigger",
						    NULL);

	if (!of_property_read_string(nc, "default-state", &state)) {
		if (!strcmp(state, "on")) {
			led->cdev.brightness = LED_FULL;
		} else if (!strcmp(state, "keep")) {
			void __iomem *mode;
			unsigned long val, shift;

			shift = bcm6328_pin2shift(led->pin);
			if (shift / 16)
				mode = mem + BCM6328_REG_MODE_HI;
			else
				mode = mem + BCM6328_REG_MODE_LO;

			val = bcm6328_led_read(mode) >>
			      BCM6328_LED_SHIFT(shift % 16);
			val &= BCM6328_LED_MODE_MASK;
			if ((led->active_low && val == BCM6328_LED_MODE_OFF) ||
			    (!led->active_low && val == BCM6328_LED_MODE_ON))
				led->cdev.brightness = LED_FULL;
			else
				led->cdev.brightness = LED_OFF;
		} else {
			led->cdev.brightness = LED_OFF;
		}
	} else {
		led->cdev.brightness = LED_OFF;
	}

	bcm6328_led_set(&led->cdev, led->cdev.brightness);

	led->cdev.brightness_set = bcm6328_led_set;
	led->cdev.blink_set = bcm6328_blink_set;

	rc = led_classdev_register(dev, &led->cdev);
	if (rc < 0)
		return rc;

	dev_dbg(dev, "registered LED %s\n", led->cdev.name);

	return 0;
}

static int bcm6328_leds_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = pdev->dev.of_node;
	struct device_node *child;
	struct resource *mem_r;
	void __iomem *mem;
	spinlock_t *lock; /* memory lock */
	unsigned long val, *blink_leds, *blink_delay;

	mem_r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!mem_r)
		return -EINVAL;

	mem = devm_ioremap_resource(dev, mem_r);
	if (IS_ERR(mem))
		return PTR_ERR(mem);

	lock = devm_kzalloc(dev, sizeof(*lock), GFP_KERNEL);
	if (!lock)
		return -ENOMEM;

	blink_leds = devm_kzalloc(dev, sizeof(*blink_leds), GFP_KERNEL);
	if (!blink_leds)
		return -ENOMEM;

	blink_delay = devm_kzalloc(dev, sizeof(*blink_delay), GFP_KERNEL);
	if (!blink_delay)
		return -ENOMEM;

	spin_lock_init(lock);

	bcm6328_led_write(mem + BCM6328_REG_HWDIS, ~0);
	bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_HI, 0);
	bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_LO, 0);

	val = bcm6328_led_read(mem + BCM6328_REG_INIT);
	val &= ~(BCM6328_INIT_MASK);
	if (of_property_read_bool(np, "brcm,serial-leds"))
		val |= BCM6328_SERIAL_LED_EN;
	if (of_property_read_bool(np, "brcm,serial-mux"))
		val |= BCM6328_SERIAL_LED_MUX;
	if (of_property_read_bool(np, "brcm,serial-clk-low"))
		val |= BCM6328_SERIAL_LED_CLK_NPOL;
	if (!of_property_read_bool(np, "brcm,serial-dat-low"))
		val |= BCM6328_SERIAL_LED_DATA_PPOL;
	if (!of_property_read_bool(np, "brcm,serial-shift-inv"))
		val |= BCM6328_SERIAL_LED_SHIFT_DIR;
	bcm6328_led_write(mem + BCM6328_REG_INIT, val);

	for_each_available_child_of_node(np, child) {
		int rc;
		u32 reg;

		if (of_property_read_u32(child, "reg", &reg))
			continue;

		if (reg >= BCM6328_LED_MAX_COUNT) {
			dev_err(dev, "invalid LED (%u >= %d)\n", reg,
				BCM6328_LED_MAX_COUNT);
			continue;
		}

		if (of_property_read_bool(child, "brcm,hardware-controlled"))
			rc = bcm6328_hwled(dev, child, reg, mem, lock);
		else
			rc = bcm6328_led(dev, child, reg, mem, lock,
					 blink_leds, blink_delay);

		if (rc < 0) {
			of_node_put(child);
			return rc;
		}
	}

	return 0;
}

static const struct of_device_id bcm6328_leds_of_match[] = {
	{ .compatible = "brcm,bcm6328-leds", },
	{ },
};
MODULE_DEVICE_TABLE(of, bcm6328_leds_of_match);

static struct platform_driver bcm6328_leds_driver = {
	.probe = bcm6328_leds_probe,
	.driver = {
		.name = "leds-bcm6328",
		.of_match_table = bcm6328_leds_of_match,
	},
};

module_platform_driver(bcm6328_leds_driver);

MODULE_AUTHOR("Álvaro Fernández Rojas <noltari@gmail.com>");
MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
MODULE_DESCRIPTION("LED driver for BCM6328 controllers");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:leds-bcm6328");
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
fd7b025a ÁFR	2	/*
	3	* Driver for BCM6328 memory-mapped LEDs, based on leds-syscon.c
	4	*
	5	* Copyright 2015 Álvaro Fernández Rojas <noltari@gmail.com>
	6	* Copyright 2015 Jonas Gorski <jogo@openwrt.org>
fd7b025a ÁFR	7	*/
	8	#include <linux/io.h>
	9	#include <linux/leds.h>
	10	#include <linux/module.h>
	11	#include <linux/of.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/spinlock.h>
	14
	15	#define BCM6328_REG_INIT 0x00
	16	#define BCM6328_REG_MODE_HI 0x04
	17	#define BCM6328_REG_MODE_LO 0x08
	18	#define BCM6328_REG_HWDIS 0x0c
	19	#define BCM6328_REG_STROBE 0x10
	20	#define BCM6328_REG_LNKACTSEL_HI 0x14
	21	#define BCM6328_REG_LNKACTSEL_LO 0x18
	22	#define BCM6328_REG_RBACK 0x1c
	23	#define BCM6328_REG_SERMUX 0x20
	24
	25	#define BCM6328_LED_MAX_COUNT 24
	26	#define BCM6328_LED_DEF_DELAY 500
	27	#define BCM6328_LED_INTERVAL_MS 20
	28
	29	#define BCM6328_LED_INTV_MASK 0x3f
	30	#define BCM6328_LED_FAST_INTV_SHIFT 6
	31	#define BCM6328_LED_FAST_INTV_MASK (BCM6328_LED_INTV_MASK << \
	32	BCM6328_LED_FAST_INTV_SHIFT)
	33	#define BCM6328_SERIAL_LED_EN BIT(12)
	34	#define BCM6328_SERIAL_LED_MUX BIT(13)
	35	#define BCM6328_SERIAL_LED_CLK_NPOL BIT(14)
	36	#define BCM6328_SERIAL_LED_DATA_PPOL BIT(15)
	37	#define BCM6328_SERIAL_LED_SHIFT_DIR BIT(16)
	38	#define BCM6328_LED_SHIFT_TEST BIT(30)
	39	#define BCM6328_LED_TEST BIT(31)
9f82c778	40	#define BCM6328_INIT_MASK (BCM6328_SERIAL_LED_EN \| \
41251e24	41	BCM6328_SERIAL_LED_MUX \| \
9f82c778 ÁFR	42	BCM6328_SERIAL_LED_CLK_NPOL \| \
	43	BCM6328_SERIAL_LED_DATA_PPOL \| \
	44	BCM6328_SERIAL_LED_SHIFT_DIR)
fd7b025a ÁFR	45
fd7b025a ÁFR	46	#define BCM6328_LED_MODE_MASK 3
b964c5ba	47	#define BCM6328_LED_MODE_ON 0
fd7b025a ÁFR	48	#define BCM6328_LED_MODE_FAST 1
fd7b025a ÁFR	49	#define BCM6328_LED_MODE_BLINK 2
b964c5ba	50	#define BCM6328_LED_MODE_OFF 3
fd7b025a ÁFR	51	#define BCM6328_LED_SHIFT(X) ((X) << 1)
	52
	53	/**
	54	* struct bcm6328_led - state container for bcm6328 based LEDs
	55	* @cdev: LED class device for this LED
	56	* @mem: memory resource
	57	* @lock: memory lock
	58	* @pin: LED pin number
	59	* @blink_leds: blinking LEDs
	60	* @blink_delay: blinking delay
	61	* @active_low: LED is active low
	62	*/
	63	struct bcm6328_led {
	64	struct led_classdev cdev;
	65	void __iomem *mem;
	66	spinlock_t *lock;
	67	unsigned long pin;
	68	unsigned long *blink_leds;
	69	unsigned long *blink_delay;
	70	bool active_low;
	71	};
	72
	73	static void bcm6328_led_write(void __iomem *reg, unsigned long data)
	74	{
a06cd4b7	75	#ifdef CONFIG_CPU_BIG_ENDIAN
fd7b025a	76	iowrite32be(data, reg);
a06cd4b7 ÁFR	77	#else
	78	writel(data, reg);
	79	#endif
fd7b025a ÁFR	80	}
	81
	82	static unsigned long bcm6328_led_read(void __iomem *reg)
	83	{
a06cd4b7	84	#ifdef CONFIG_CPU_BIG_ENDIAN
fd7b025a	85	return ioread32be(reg);
a06cd4b7 ÁFR	86	#else
	87	return readl(reg);
	88	#endif
fd7b025a ÁFR	89	}
	90
	91	/**
	92	* LEDMode 64 bits / 24 LEDs
	93	* bits [31:0] -> LEDs 8-23
	94	* bits [47:32] -> LEDs 0-7
	95	* bits [63:48] -> unused
	96	*/
	97	static unsigned long bcm6328_pin2shift(unsigned long pin)
	98	{
	99	if (pin < 8)
	100	return pin + 16; /* LEDs 0-7 (bits 47:32) */
	101	else
	102	return pin - 8; /* LEDs 8-23 (bits 31:0) */
	103	}
	104
	105	static void bcm6328_led_mode(struct bcm6328_led *led, unsigned long value)
	106	{
	107	void __iomem *mode;
	108	unsigned long val, shift;
	109
	110	shift = bcm6328_pin2shift(led->pin);
	111	if (shift / 16)
	112	mode = led->mem + BCM6328_REG_MODE_HI;
	113	else
	114	mode = led->mem + BCM6328_REG_MODE_LO;
	115
	116	val = bcm6328_led_read(mode);
	117	val &= ~(BCM6328_LED_MODE_MASK << BCM6328_LED_SHIFT(shift % 16));
	118	val \|= (value << BCM6328_LED_SHIFT(shift % 16));
	119	bcm6328_led_write(mode, val);
	120	}
	121
	122	static void bcm6328_led_set(struct led_classdev *led_cdev,
	123	enum led_brightness value)
	124	{
	125	struct bcm6328_led *led =
	126	container_of(led_cdev, struct bcm6328_led, cdev);
	127	unsigned long flags;
	128
	129	spin_lock_irqsave(led->lock, flags);
	130	*(led->blink_leds) &= ~BIT(led->pin);
	131	if ((led->active_low && value == LED_OFF) \|\|
	132	(!led->active_low && value != LED_OFF))
fd7b025a	133	bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
b964c5ba SA	134	else
b964c5ba SA	135	bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
fd7b025a ÁFR	136	spin_unlock_irqrestore(led->lock, flags);
	137	}
	138
1b85a5a5 ÁFR	139	static unsigned long bcm6328_blink_delay(unsigned long delay)
	140	{
	141	unsigned long bcm6328_delay;
	142
	143	bcm6328_delay = delay + BCM6328_LED_INTERVAL_MS / 2;
	144	bcm6328_delay = bcm6328_delay / BCM6328_LED_INTERVAL_MS;
	145	if (bcm6328_delay == 0)
	146	bcm6328_delay = 1;
	147
	148	return bcm6328_delay;
	149	}
	150
fd7b025a ÁFR	151	static int bcm6328_blink_set(struct led_classdev *led_cdev,
	152	unsigned long delay_on, unsigned long delay_off)
	153	{
	154	struct bcm6328_led *led =
	155	container_of(led_cdev, struct bcm6328_led, cdev);
	156	unsigned long delay, flags;
143b77ce	157	int rc;
fd7b025a ÁFR	158
	159	if (!*delay_on)
	160	*delay_on = BCM6328_LED_DEF_DELAY;
	161	if (!*delay_off)
	162	*delay_off = BCM6328_LED_DEF_DELAY;
	163
1b85a5a5 ÁFR	164	delay = bcm6328_blink_delay(*delay_on);
1b85a5a5 ÁFR	165	if (delay != bcm6328_blink_delay(*delay_off)) {
fd7b025a ÁFR	166	dev_dbg(led_cdev->dev,
	167	"fallback to soft blinking (delay_on != delay_off)\n");
	168	return -EINVAL;
	169	}
	170
1b85a5a5	171	if (delay > BCM6328_LED_INTV_MASK) {
fd7b025a ÁFR	172	dev_dbg(led_cdev->dev,
	173	"fallback to soft blinking (delay > %ums)\n",
	174	BCM6328_LED_INTV_MASK * BCM6328_LED_INTERVAL_MS);
	175	return -EINVAL;
	176	}
	177
	178	spin_lock_irqsave(led->lock, flags);
	179	if (*(led->blink_leds) == 0 \|\|
	180	*(led->blink_leds) == BIT(led->pin) \|\|
	181	*(led->blink_delay) == delay) {
	182	unsigned long val;
	183
	184	*(led->blink_leds) \|= BIT(led->pin);
	185	*(led->blink_delay) = delay;
	186
	187	val = bcm6328_led_read(led->mem + BCM6328_REG_INIT);
	188	val &= ~BCM6328_LED_FAST_INTV_MASK;
	189	val \|= (delay << BCM6328_LED_FAST_INTV_SHIFT);
	190	bcm6328_led_write(led->mem + BCM6328_REG_INIT, val);
	191
	192	bcm6328_led_mode(led, BCM6328_LED_MODE_BLINK);
143b77ce	193	rc = 0;
fd7b025a	194	} else {
fd7b025a ÁFR	195	dev_dbg(led_cdev->dev,
fd7b025a ÁFR	196	"fallback to soft blinking (delay already set)\n");
143b77ce	197	rc = -EINVAL;
fd7b025a	198	}
143b77ce	199	spin_unlock_irqrestore(led->lock, flags);
fd7b025a	200
143b77ce	201	return rc;
fd7b025a ÁFR	202	}
	203
	204	static int bcm6328_hwled(struct device dev, struct device_node nc, u32 reg,
	205	void __iomem mem, spinlock_t lock)
	206	{
	207	int i, cnt;
	208	unsigned long flags, val;
	209
	210	spin_lock_irqsave(lock, flags);
	211	val = bcm6328_led_read(mem + BCM6328_REG_HWDIS);
	212	val &= ~BIT(reg);
	213	bcm6328_led_write(mem + BCM6328_REG_HWDIS, val);
	214	spin_unlock_irqrestore(lock, flags);
	215
	216	/* Only LEDs 0-7 can be activity/link controlled */
	217	if (reg >= 8)
	218	return 0;
	219
	220	cnt = of_property_count_elems_of_size(nc, "brcm,link-signal-sources",
	221	sizeof(u32));
	222	for (i = 0; i < cnt; i++) {
	223	u32 sel;
	224	void __iomem *addr;
	225
	226	if (reg < 4)
	227	addr = mem + BCM6328_REG_LNKACTSEL_LO;
	228	else
	229	addr = mem + BCM6328_REG_LNKACTSEL_HI;
	230
	231	of_property_read_u32_index(nc, "brcm,link-signal-sources", i,
	232	&sel);
	233
	234	if (reg / 4 != sel / 4) {
	235	dev_warn(dev, "invalid link signal source\n");
	236	continue;
	237	}
	238
	239	spin_lock_irqsave(lock, flags);
	240	val = bcm6328_led_read(addr);
4f02b50e	241	val \|= (BIT(reg % 4) << (((sel % 4) * 4) + 16));
fd7b025a ÁFR	242	bcm6328_led_write(addr, val);
	243	spin_unlock_irqrestore(lock, flags);
	244	}
	245
	246	cnt = of_property_count_elems_of_size(nc,
	247	"brcm,activity-signal-sources",
	248	sizeof(u32));
	249	for (i = 0; i < cnt; i++) {
	250	u32 sel;
	251	void __iomem *addr;
	252
	253	if (reg < 4)
	254	addr = mem + BCM6328_REG_LNKACTSEL_LO;
	255	else
	256	addr = mem + BCM6328_REG_LNKACTSEL_HI;
	257
	258	of_property_read_u32_index(nc, "brcm,activity-signal-sources",
	259	i, &sel);
	260
	261	if (reg / 4 != sel / 4) {
	262	dev_warn(dev, "invalid activity signal source\n");
	263	continue;
	264	}
	265
	266	spin_lock_irqsave(lock, flags);
	267	val = bcm6328_led_read(addr);
4f02b50e	268	val \|= (BIT(reg % 4) << ((sel % 4) * 4));
fd7b025a ÁFR	269	bcm6328_led_write(addr, val);
	270	spin_unlock_irqrestore(lock, flags);
	271	}
	272
	273	return 0;
	274	}
	275
	276	static int bcm6328_led(struct device dev, struct device_node nc, u32 reg,
	277	void __iomem mem, spinlock_t lock,
	278	unsigned long blink_leds, unsigned long blink_delay)
	279	{
	280	struct bcm6328_led *led;
fd7b025a ÁFR	281	const char *state;
	282	int rc;
	283
	284	led = devm_kzalloc(dev, sizeof(*led), GFP_KERNEL);
	285	if (!led)
	286	return -ENOMEM;
	287
	288	led->pin = reg;
	289	led->mem = mem;
	290	led->lock = lock;
	291	led->blink_leds = blink_leds;
	292	led->blink_delay = blink_delay;
	293
	294	if (of_property_read_bool(nc, "active-low"))
	295	led->active_low = true;
	296
	297	led->cdev.name = of_get_property(nc, "label", NULL) ? : nc->name;
	298	led->cdev.default_trigger = of_get_property(nc,
	299	"linux,default-trigger",
	300	NULL);
	301
	302	if (!of_property_read_string(nc, "default-state", &state)) {
fd7b025a ÁFR	303	if (!strcmp(state, "on")) {
fd7b025a ÁFR	304	led->cdev.brightness = LED_FULL;
fd7b025a ÁFR	305	} else if (!strcmp(state, "keep")) {
	306	void __iomem *mode;
	307	unsigned long val, shift;
	308
	309	shift = bcm6328_pin2shift(led->pin);
	310	if (shift / 16)
	311	mode = mem + BCM6328_REG_MODE_HI;
	312	else
	313	mode = mem + BCM6328_REG_MODE_LO;
	314
d8fe1606 ÁFR	315	val = bcm6328_led_read(mode) >>
d8fe1606 ÁFR	316	BCM6328_LED_SHIFT(shift % 16);
fd7b025a	317	val &= BCM6328_LED_MODE_MASK;
b964c5ba SA	318	if ((led->active_low && val == BCM6328_LED_MODE_OFF) \|\|
b964c5ba SA	319	(!led->active_low && val == BCM6328_LED_MODE_ON))
fd7b025a	320	led->cdev.brightness = LED_FULL;
d8fe1606	321	else
fd7b025a	322	led->cdev.brightness = LED_OFF;
fd7b025a ÁFR	323	} else {
fd7b025a ÁFR	324	led->cdev.brightness = LED_OFF;
fd7b025a	325	}
d8fe1606 ÁFR	326	} else {
d8fe1606 ÁFR	327	led->cdev.brightness = LED_OFF;
fd7b025a	328	}
d8fe1606	329
9d3c0663 SA	330	bcm6328_led_set(&led->cdev, led->cdev.brightness);
9d3c0663 SA	331
fd7b025a ÁFR	332	led->cdev.brightness_set = bcm6328_led_set;
	333	led->cdev.blink_set = bcm6328_blink_set;
	334
	335	rc = led_classdev_register(dev, &led->cdev);
	336	if (rc < 0)
	337	return rc;
	338
	339	dev_dbg(dev, "registered LED %s\n", led->cdev.name);
	340
	341	return 0;
	342	}
	343
	344	static int bcm6328_leds_probe(struct platform_device *pdev)
	345	{
	346	struct device *dev = &pdev->dev;
	347	struct device_node *np = pdev->dev.of_node;
	348	struct device_node *child;
	349	struct resource *mem_r;
	350	void __iomem *mem;
41251e24	351	spinlock_t lock; / memory lock */
fd7b025a ÁFR	352	unsigned long val, blink_leds, blink_delay;
	353
	354	mem_r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	355	if (!mem_r)
	356	return -EINVAL;
	357
	358	mem = devm_ioremap_resource(dev, mem_r);
	359	if (IS_ERR(mem))
	360	return PTR_ERR(mem);
	361
	362	lock = devm_kzalloc(dev, sizeof(*lock), GFP_KERNEL);
	363	if (!lock)
	364	return -ENOMEM;
	365
	366	blink_leds = devm_kzalloc(dev, sizeof(*blink_leds), GFP_KERNEL);
	367	if (!blink_leds)
	368	return -ENOMEM;
	369
	370	blink_delay = devm_kzalloc(dev, sizeof(*blink_delay), GFP_KERNEL);
	371	if (!blink_delay)
	372	return -ENOMEM;
	373
	374	spin_lock_init(lock);
	375
	376	bcm6328_led_write(mem + BCM6328_REG_HWDIS, ~0);
	377	bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_HI, 0);
	378	bcm6328_led_write(mem + BCM6328_REG_LNKACTSEL_LO, 0);
	379
	380	val = bcm6328_led_read(mem + BCM6328_REG_INIT);
9f82c778	381	val &= ~(BCM6328_INIT_MASK);
fd7b025a ÁFR	382	if (of_property_read_bool(np, "brcm,serial-leds"))
fd7b025a ÁFR	383	val \|= BCM6328_SERIAL_LED_EN;
9f82c778 ÁFR	384	if (of_property_read_bool(np, "brcm,serial-mux"))
	385	val \|= BCM6328_SERIAL_LED_MUX;
	386	if (of_property_read_bool(np, "brcm,serial-clk-low"))
	387	val \|= BCM6328_SERIAL_LED_CLK_NPOL;
	388	if (!of_property_read_bool(np, "brcm,serial-dat-low"))
	389	val \|= BCM6328_SERIAL_LED_DATA_PPOL;
	390	if (!of_property_read_bool(np, "brcm,serial-shift-inv"))
	391	val \|= BCM6328_SERIAL_LED_SHIFT_DIR;
fd7b025a ÁFR	392	bcm6328_led_write(mem + BCM6328_REG_INIT, val);
	393
	394	for_each_available_child_of_node(np, child) {
	395	int rc;
	396	u32 reg;
	397
	398	if (of_property_read_u32(child, "reg", &reg))
	399	continue;
	400
	401	if (reg >= BCM6328_LED_MAX_COUNT) {
79653fbb	402	dev_err(dev, "invalid LED (%u >= %d)\n", reg,
fd7b025a ÁFR	403	BCM6328_LED_MAX_COUNT);
	404	continue;
	405	}
	406
	407	if (of_property_read_bool(child, "brcm,hardware-controlled"))
	408	rc = bcm6328_hwled(dev, child, reg, mem, lock);
	409	else
	410	rc = bcm6328_led(dev, child, reg, mem, lock,
	411	blink_leds, blink_delay);
	412
6cc76244 JL	413	if (rc < 0) {
6cc76244 JL	414	of_node_put(child);
fd7b025a	415	return rc;
6cc76244	416	}
fd7b025a ÁFR	417	}
	418
	419	return 0;
	420	}
	421
	422	static const struct of_device_id bcm6328_leds_of_match[] = {
	423	{ .compatible = "brcm,bcm6328-leds", },
	424	{ },
	425	};
6528ca19	426	MODULE_DEVICE_TABLE(of, bcm6328_leds_of_match);
fd7b025a ÁFR	427
	428	static struct platform_driver bcm6328_leds_driver = {
	429	.probe = bcm6328_leds_probe,
	430	.driver = {
	431	.name = "leds-bcm6328",
	432	.of_match_table = bcm6328_leds_of_match,
	433	},
	434	};
	435
	436	module_platform_driver(bcm6328_leds_driver);
	437
	438	MODULE_AUTHOR("Álvaro Fernández Rojas <noltari@gmail.com>");
	439	MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
	440	MODULE_DESCRIPTION("LED driver for BCM6328 controllers");
	441	MODULE_LICENSE("GPL v2");
	442	MODULE_ALIAS("platform:leds-bcm6328");