[deliverable/linux.git] / drivers / leds / leds-bcm6328.c

/*
 * 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>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#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)
{
	iowrite32be(data, reg);
}

static unsigned long bcm6328_led_read(void __iomem *reg)
{
	return ioread32be(reg);
}

/**
 * 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 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;

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

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

	delay = *delay_on / BCM6328_LED_INTERVAL_MS;
	if (delay == 0) {
		delay = 1;
	} else 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);

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

	return 0;
}

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