[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_LED_MODE_MASK		3
#define BCM6328_LED_MODE_OFF		0
#define BCM6328_LED_MODE_FAST		1
#define BCM6328_LED_MODE_BLINK		2
#define BCM6328_LED_MODE_ON		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_OFF);
	else
		bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
	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;
	unsigned long flags;
	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);

	spin_lock_irqsave(lock, flags);
	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_ON) ||
			    (!led->active_low && val == BCM6328_LED_MODE_OFF))
				led->cdev.brightness = LED_FULL;
			else
				led->cdev.brightness = LED_OFF;
		} else {
			led->cdev.brightness = LED_OFF;
		}
	} else {
		led->cdev.brightness = LED_OFF;
	}

	if ((led->active_low && led->cdev.brightness == LED_FULL) ||
	    (!led->active_low && led->cdev.brightness == LED_OFF))
		bcm6328_led_mode(led, BCM6328_LED_MODE_ON);
	else
		bcm6328_led_mode(led, BCM6328_LED_MODE_OFF);
	spin_unlock_irqrestore(lock, flags);

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