[mirror_ubuntu-jammy-kernel.git] / drivers / leds / leds-netxbig.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
 *
 * Copyright (C) 2010 LaCie
 *
 * Author: Simon Guinot <sguinot@lacie.com>
 */

#include <linux/module.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/gpio/consumer.h>
#include <linux/leds.h>
#include <linux/of.h>
#include <linux/of_platform.h>

struct netxbig_gpio_ext {
	struct gpio_desc **addr;
	int		num_addr;
	struct gpio_desc **data;
	int		num_data;
	struct gpio_desc *enable;
};

enum netxbig_led_mode {
	NETXBIG_LED_OFF,
	NETXBIG_LED_ON,
	NETXBIG_LED_SATA,
	NETXBIG_LED_TIMER1,
	NETXBIG_LED_TIMER2,
	NETXBIG_LED_MODE_NUM,
};

#define NETXBIG_LED_INVALID_MODE NETXBIG_LED_MODE_NUM

struct netxbig_led_timer {
	unsigned long		delay_on;
	unsigned long		delay_off;
	enum netxbig_led_mode	mode;
};

struct netxbig_led {
	const char	*name;
	const char	*default_trigger;
	int		mode_addr;
	int		*mode_val;
	int		bright_addr;
	int		bright_max;
};

struct netxbig_led_platform_data {
	struct netxbig_gpio_ext	*gpio_ext;
	struct netxbig_led_timer *timer;
	int			num_timer;
	struct netxbig_led	*leds;
	int			num_leds;
};

/*
 * GPIO extension bus.
 */

static DEFINE_SPINLOCK(gpio_ext_lock);

static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
{
	int pin;

	for (pin = 0; pin < gpio_ext->num_addr; pin++)
		gpiod_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
}

static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
{
	int pin;

	for (pin = 0; pin < gpio_ext->num_data; pin++)
		gpiod_set_value(gpio_ext->data[pin], (data >> pin) & 1);
}

static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
{
	/* Enable select is done on the raising edge. */
	gpiod_set_value(gpio_ext->enable, 0);
	gpiod_set_value(gpio_ext->enable, 1);
}

static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
			       int addr, int value)
{
	unsigned long flags;

	spin_lock_irqsave(&gpio_ext_lock, flags);
	gpio_ext_set_addr(gpio_ext, addr);
	gpio_ext_set_data(gpio_ext, value);
	gpio_ext_enable_select(gpio_ext);
	spin_unlock_irqrestore(&gpio_ext_lock, flags);
}

/*
 * Class LED driver.
 */

struct netxbig_led_data {
	struct netxbig_gpio_ext	*gpio_ext;
	struct led_classdev	cdev;
	int			mode_addr;
	int			*mode_val;
	int			bright_addr;
	struct			netxbig_led_timer *timer;
	int			num_timer;
	enum netxbig_led_mode	mode;
	int			sata;
	spinlock_t		lock;
};

static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
				      unsigned long delay_on,
				      unsigned long delay_off,
				      struct netxbig_led_timer *timer,
				      int num_timer)
{
	int i;

	for (i = 0; i < num_timer; i++) {
		if (timer[i].delay_on == delay_on &&
		    timer[i].delay_off == delay_off) {
			*mode = timer[i].mode;
			return 0;
		}
	}
	return -EINVAL;
}

static int netxbig_led_blink_set(struct led_classdev *led_cdev,
				 unsigned long *delay_on,
				 unsigned long *delay_off)
{
	struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);
	enum netxbig_led_mode mode;
	int mode_val;
	int ret;

	/* Look for a LED mode with the requested timer frequency. */
	ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off,
					 led_dat->timer, led_dat->num_timer);
	if (ret < 0)
		return ret;

	mode_val = led_dat->mode_val[mode];
	if (mode_val == NETXBIG_LED_INVALID_MODE)
		return -EINVAL;

	spin_lock_irq(&led_dat->lock);

	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	led_dat->mode = mode;

	spin_unlock_irq(&led_dat->lock);

	return 0;
}

static void netxbig_led_set(struct led_classdev *led_cdev,
			    enum led_brightness value)
{
	struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);
	enum netxbig_led_mode mode;
	int mode_val;
	int set_brightness = 1;
	unsigned long flags;

	spin_lock_irqsave(&led_dat->lock, flags);

	if (value == LED_OFF) {
		mode = NETXBIG_LED_OFF;
		set_brightness = 0;
	} else {
		if (led_dat->sata)
			mode = NETXBIG_LED_SATA;
		else if (led_dat->mode == NETXBIG_LED_OFF)
			mode = NETXBIG_LED_ON;
		else /* Keep 'timer' mode. */
			mode = led_dat->mode;
	}
	mode_val = led_dat->mode_val[mode];

	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	led_dat->mode = mode;
	/*
	 * Note that the brightness register is shared between all the
	 * SATA LEDs. So, change the brightness setting for a single
	 * SATA LED will affect all the others.
	 */
	if (set_brightness)
		gpio_ext_set_value(led_dat->gpio_ext,
				   led_dat->bright_addr, value);

	spin_unlock_irqrestore(&led_dat->lock, flags);
}

static ssize_t netxbig_led_sata_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buff, size_t count)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);
	unsigned long enable;
	enum netxbig_led_mode mode;
	int mode_val;
	int ret;

	ret = kstrtoul(buff, 10, &enable);
	if (ret < 0)
		return ret;

	enable = !!enable;

	spin_lock_irq(&led_dat->lock);

	if (led_dat->sata == enable) {
		ret = count;
		goto exit_unlock;
	}

	if (led_dat->mode != NETXBIG_LED_ON &&
	    led_dat->mode != NETXBIG_LED_SATA)
		mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
	else if (enable)
		mode = NETXBIG_LED_SATA;
	else
		mode = NETXBIG_LED_ON;

	mode_val = led_dat->mode_val[mode];
	if (mode_val == NETXBIG_LED_INVALID_MODE) {
		ret = -EINVAL;
		goto exit_unlock;
	}

	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	led_dat->mode = mode;
	led_dat->sata = enable;

	ret = count;

exit_unlock:
	spin_unlock_irq(&led_dat->lock);

	return ret;
}

static ssize_t netxbig_led_sata_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);

	return sprintf(buf, "%d\n", led_dat->sata);
}

static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);

static struct attribute *netxbig_led_attrs[] = {
	&dev_attr_sata.attr,
	NULL
};
ATTRIBUTE_GROUPS(netxbig_led);

static int create_netxbig_led(struct platform_device *pdev,
			      struct netxbig_led_platform_data *pdata,
			      struct netxbig_led_data *led_dat,
			      const struct netxbig_led *template)
{
	spin_lock_init(&led_dat->lock);
	led_dat->gpio_ext = pdata->gpio_ext;
	led_dat->cdev.name = template->name;
	led_dat->cdev.default_trigger = template->default_trigger;
	led_dat->cdev.blink_set = netxbig_led_blink_set;
	led_dat->cdev.brightness_set = netxbig_led_set;
	/*
	 * Because the GPIO extension bus don't allow to read registers
	 * value, there is no way to probe the LED initial state.
	 * So, the initial sysfs LED value for the "brightness" and "sata"
	 * attributes are inconsistent.
	 *
	 * Note that the initial LED state can't be reconfigured.
	 * The reason is that the LED behaviour must stay uniform during
	 * the whole boot process (bootloader+linux).
	 */
	led_dat->sata = 0;
	led_dat->cdev.brightness = LED_OFF;
	led_dat->cdev.max_brightness = template->bright_max;
	led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
	led_dat->mode_addr = template->mode_addr;
	led_dat->mode_val = template->mode_val;
	led_dat->bright_addr = template->bright_addr;
	led_dat->timer = pdata->timer;
	led_dat->num_timer = pdata->num_timer;
	/*
	 * If available, expose the SATA activity blink capability through
	 * a "sata" sysfs attribute.
	 */
	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
		led_dat->cdev.groups = netxbig_led_groups;

	return devm_led_classdev_register(&pdev->dev, &led_dat->cdev);
}

/**
 * netxbig_gpio_ext_remove() - Clean up GPIO extension data
 * @data: managed resource data to clean up
 *
 * Since we pick GPIO descriptors from another device than the device our
 * driver is probing to, we need to register a specific callback to free
 * these up using managed resources.
 */
static void netxbig_gpio_ext_remove(void *data)
{
	struct netxbig_gpio_ext *gpio_ext = data;
	int i;

	for (i = 0; i < gpio_ext->num_addr; i++)
		gpiod_put(gpio_ext->addr[i]);
	for (i = 0; i < gpio_ext->num_data; i++)
		gpiod_put(gpio_ext->data[i]);
	gpiod_put(gpio_ext->enable);
}

/**
 * netxbig_gpio_ext_get() - Obtain GPIO extension device data
 * @dev: main LED device
 * @gpio_ext_dev: the GPIO extension device
 * @gpio_ext: the data structure holding the GPIO extension data
 *
 * This function walks the subdevice that only contain GPIO line
 * handles in the device tree and obtains the GPIO descriptors from that
 * device.
 */
static int netxbig_gpio_ext_get(struct device *dev,
				struct device *gpio_ext_dev,
				struct netxbig_gpio_ext *gpio_ext)
{
	struct gpio_desc **addr, **data;
	int num_addr, num_data;
	struct gpio_desc *gpiod;
	int ret;
	int i;

	ret = gpiod_count(gpio_ext_dev, "addr");
	if (ret < 0) {
		dev_err(dev,
			"Failed to count GPIOs in DT property addr-gpios\n");
		return ret;
	}
	num_addr = ret;
	addr = devm_kcalloc(dev, num_addr, sizeof(*addr), GFP_KERNEL);
	if (!addr)
		return -ENOMEM;

	/*
	 * We cannot use devm_ managed resources with these GPIO descriptors
	 * since they are associated with the "GPIO extension device" which
	 * does not probe any driver. The device tree parser will however
	 * populate a platform device for it so we can anyway obtain the
	 * GPIO descriptors from the device.
	 */
	for (i = 0; i < num_addr; i++) {
		gpiod = gpiod_get_index(gpio_ext_dev, "addr", i,
					GPIOD_OUT_LOW);
		if (IS_ERR(gpiod))
			return PTR_ERR(gpiod);
		gpiod_set_consumer_name(gpiod, "GPIO extension addr");
		addr[i] = gpiod;
	}
	gpio_ext->addr = addr;
	gpio_ext->num_addr = num_addr;

	ret = gpiod_count(gpio_ext_dev, "data");
	if (ret < 0) {
		dev_err(dev,
			"Failed to count GPIOs in DT property data-gpios\n");
		return ret;
	}
	num_data = ret;
	data = devm_kcalloc(dev, num_data, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	for (i = 0; i < num_data; i++) {
		gpiod = gpiod_get_index(gpio_ext_dev, "data", i,
					GPIOD_OUT_LOW);
		if (IS_ERR(gpiod))
			return PTR_ERR(gpiod);
		gpiod_set_consumer_name(gpiod, "GPIO extension data");
		data[i] = gpiod;
	}
	gpio_ext->data = data;
	gpio_ext->num_data = num_data;

	gpiod = gpiod_get(gpio_ext_dev, "enable", GPIOD_OUT_LOW);
	if (IS_ERR(gpiod)) {
		dev_err(dev,
			"Failed to get GPIO from DT property enable-gpio\n");
		return PTR_ERR(gpiod);
	}
	gpiod_set_consumer_name(gpiod, "GPIO extension enable");
	gpio_ext->enable = gpiod;

	return devm_add_action_or_reset(dev, netxbig_gpio_ext_remove, gpio_ext);
}

static int netxbig_leds_get_of_pdata(struct device *dev,
				     struct netxbig_led_platform_data *pdata)
{
	struct device_node *np = dev->of_node;
	struct device_node *gpio_ext_np;
	struct platform_device *gpio_ext_pdev;
	struct device *gpio_ext_dev;
	struct device_node *child;
	struct netxbig_gpio_ext *gpio_ext;
	struct netxbig_led_timer *timers;
	struct netxbig_led *leds, *led;
	int num_timers;
	int num_leds = 0;
	int ret;
	int i;

	/* GPIO extension */
	gpio_ext_np = of_parse_phandle(np, "gpio-ext", 0);
	if (!gpio_ext_np) {
		dev_err(dev, "Failed to get DT handle gpio-ext\n");
		return -EINVAL;
	}
	gpio_ext_pdev = of_find_device_by_node(gpio_ext_np);
	if (!gpio_ext_pdev) {
		dev_err(dev, "Failed to find platform device for gpio-ext\n");
		return -ENODEV;
	}
	gpio_ext_dev = &gpio_ext_pdev->dev;

	gpio_ext = devm_kzalloc(dev, sizeof(*gpio_ext), GFP_KERNEL);
	if (!gpio_ext) {
		of_node_put(gpio_ext_np);
		return -ENOMEM;
	}
	ret = netxbig_gpio_ext_get(dev, gpio_ext_dev, gpio_ext);
	of_node_put(gpio_ext_np);
	if (ret)
		return ret;
	pdata->gpio_ext = gpio_ext;

	/* Timers (optional) */
	ret = of_property_count_u32_elems(np, "timers");
	if (ret > 0) {
		if (ret % 3)
			return -EINVAL;
		num_timers = ret / 3;
		timers = devm_kcalloc(dev, num_timers, sizeof(*timers),
				      GFP_KERNEL);
		if (!timers)
			return -ENOMEM;
		for (i = 0; i < num_timers; i++) {
			u32 tmp;

			of_property_read_u32_index(np, "timers", 3 * i,
						   &timers[i].mode);
			if (timers[i].mode >= NETXBIG_LED_MODE_NUM)
				return -EINVAL;
			of_property_read_u32_index(np, "timers",
						   3 * i + 1, &tmp);
			timers[i].delay_on = tmp;
			of_property_read_u32_index(np, "timers",
						   3 * i + 2, &tmp);
			timers[i].delay_off = tmp;
		}
		pdata->timer = timers;
		pdata->num_timer = num_timers;
	}

	/* LEDs */
	num_leds = of_get_child_count(np);
	if (!num_leds) {
		dev_err(dev, "No LED subnodes found in DT\n");
		return -ENODEV;
	}

	leds = devm_kcalloc(dev, num_leds, sizeof(*leds), GFP_KERNEL);
	if (!leds)
		return -ENOMEM;

	led = leds;
	for_each_child_of_node(np, child) {
		const char *string;
		int *mode_val;
		int num_modes;

		ret = of_property_read_u32(child, "mode-addr",
					   &led->mode_addr);
		if (ret)
			goto err_node_put;

		ret = of_property_read_u32(child, "bright-addr",
					   &led->bright_addr);
		if (ret)
			goto err_node_put;

		ret = of_property_read_u32(child, "max-brightness",
					   &led->bright_max);
		if (ret)
			goto err_node_put;

		mode_val =
			devm_kcalloc(dev,
				     NETXBIG_LED_MODE_NUM, sizeof(*mode_val),
				     GFP_KERNEL);
		if (!mode_val) {
			ret = -ENOMEM;
			goto err_node_put;
		}

		for (i = 0; i < NETXBIG_LED_MODE_NUM; i++)
			mode_val[i] = NETXBIG_LED_INVALID_MODE;

		ret = of_property_count_u32_elems(child, "mode-val");
		if (ret < 0 || ret % 2) {
			ret = -EINVAL;
			goto err_node_put;
		}
		num_modes = ret / 2;
		if (num_modes > NETXBIG_LED_MODE_NUM) {
			ret = -EINVAL;
			goto err_node_put;
		}

		for (i = 0; i < num_modes; i++) {
			int mode;
			int val;

			of_property_read_u32_index(child,
						   "mode-val", 2 * i, &mode);
			of_property_read_u32_index(child,
						   "mode-val", 2 * i + 1, &val);
			if (mode >= NETXBIG_LED_MODE_NUM) {
				ret = -EINVAL;
				goto err_node_put;
			}
			mode_val[mode] = val;
		}
		led->mode_val = mode_val;

		if (!of_property_read_string(child, "label", &string))
			led->name = string;
		else
			led->name = child->name;

		if (!of_property_read_string(child,
					     "linux,default-trigger", &string))
			led->default_trigger = string;

		led++;
	}

	pdata->leds = leds;
	pdata->num_leds = num_leds;

	return 0;

err_node_put:
	of_node_put(child);
	return ret;
}

static const struct of_device_id of_netxbig_leds_match[] = {
	{ .compatible = "lacie,netxbig-leds", },
	{},
};
MODULE_DEVICE_TABLE(of, of_netxbig_leds_match);

static int netxbig_led_probe(struct platform_device *pdev)
{
	struct netxbig_led_platform_data *pdata;
	struct netxbig_led_data *leds_data;
	int i;
	int ret;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;
	ret = netxbig_leds_get_of_pdata(&pdev->dev, pdata);
	if (ret)
		return ret;

	leds_data = devm_kcalloc(&pdev->dev,
				 pdata->num_leds, sizeof(*leds_data),
				 GFP_KERNEL);
	if (!leds_data)
		return -ENOMEM;

	for (i = 0; i < pdata->num_leds; i++) {
		ret = create_netxbig_led(pdev, pdata,
					 &leds_data[i], &pdata->leds[i]);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static struct platform_driver netxbig_led_driver = {
	.probe		= netxbig_led_probe,
	.driver		= {
		.name		= "leds-netxbig",
		.of_match_table	= of_netxbig_leds_match,
	},
};

module_platform_driver(netxbig_led_driver);

MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:leds-netxbig");
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
24467832 SG	2	/*
	3	* leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
	4	*
	5	* Copyright (C) 2010 LaCie
	6	*
	7	* Author: Simon Guinot <sguinot@lacie.com>
24467832 SG	8	*/
	9
	10	#include <linux/module.h>
24467832 SG	11	#include <linux/irq.h>
	12	#include <linux/slab.h>
	13	#include <linux/spinlock.h>
	14	#include <linux/platform_device.h>
9af512e8	15	#include <linux/gpio/consumer.h>
24467832	16	#include <linux/leds.h>
9af512e8 LW	17	#include <linux/of.h>
9af512e8 LW	18	#include <linux/of_platform.h>
156189a6 MY	19
156189a6 MY	20	struct netxbig_gpio_ext {
9af512e8	21	struct gpio_desc **addr;
156189a6	22	int num_addr;
9af512e8	23	struct gpio_desc **data;
156189a6	24	int num_data;
9af512e8	25	struct gpio_desc *enable;
156189a6 MY	26	};
	27
	28	enum netxbig_led_mode {
	29	NETXBIG_LED_OFF,
	30	NETXBIG_LED_ON,
	31	NETXBIG_LED_SATA,
	32	NETXBIG_LED_TIMER1,
	33	NETXBIG_LED_TIMER2,
	34	NETXBIG_LED_MODE_NUM,
	35	};
	36
	37	#define NETXBIG_LED_INVALID_MODE NETXBIG_LED_MODE_NUM
	38
	39	struct netxbig_led_timer {
	40	unsigned long delay_on;
	41	unsigned long delay_off;
	42	enum netxbig_led_mode mode;
	43	};
	44
	45	struct netxbig_led {
	46	const char *name;
	47	const char *default_trigger;
	48	int mode_addr;
	49	int *mode_val;
	50	int bright_addr;
	51	int bright_max;
	52	};
	53
	54	struct netxbig_led_platform_data {
	55	struct netxbig_gpio_ext *gpio_ext;
	56	struct netxbig_led_timer *timer;
	57	int num_timer;
	58	struct netxbig_led *leds;
	59	int num_leds;
	60	};
24467832 SG	61
	62	/*
	63	* GPIO extension bus.
	64	*/
	65
	66	static DEFINE_SPINLOCK(gpio_ext_lock);
	67
	68	static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
	69	{
	70	int pin;
	71
	72	for (pin = 0; pin < gpio_ext->num_addr; pin++)
9af512e8	73	gpiod_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
24467832 SG	74	}
	75
	76	static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
	77	{
	78	int pin;
	79
	80	for (pin = 0; pin < gpio_ext->num_data; pin++)
9af512e8	81	gpiod_set_value(gpio_ext->data[pin], (data >> pin) & 1);
24467832 SG	82	}
	83
	84	static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
	85	{
	86	/* Enable select is done on the raising edge. */
9af512e8 LW	87	gpiod_set_value(gpio_ext->enable, 0);
9af512e8 LW	88	gpiod_set_value(gpio_ext->enable, 1);
24467832 SG	89	}
	90
	91	static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
	92	int addr, int value)
	93	{
	94	unsigned long flags;
	95
	96	spin_lock_irqsave(&gpio_ext_lock, flags);
	97	gpio_ext_set_addr(gpio_ext, addr);
	98	gpio_ext_set_data(gpio_ext, value);
	99	gpio_ext_enable_select(gpio_ext);
	100	spin_unlock_irqrestore(&gpio_ext_lock, flags);
	101	}
	102
24467832 SG	103	/*
	104	* Class LED driver.
	105	*/
	106
	107	struct netxbig_led_data {
	108	struct netxbig_gpio_ext *gpio_ext;
	109	struct led_classdev cdev;
	110	int mode_addr;
	111	int *mode_val;
	112	int bright_addr;
24467832 SG	113	struct netxbig_led_timer *timer;
	114	int num_timer;
	115	enum netxbig_led_mode mode;
	116	int sata;
	117	spinlock_t lock;
	118	};
	119
	120	static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
	121	unsigned long delay_on,
	122	unsigned long delay_off,
	123	struct netxbig_led_timer *timer,
	124	int num_timer)
	125	{
	126	int i;
	127
	128	for (i = 0; i < num_timer; i++) {
	129	if (timer[i].delay_on == delay_on &&
	130	timer[i].delay_off == delay_off) {
	131	*mode = timer[i].mode;
	132	return 0;
	133	}
	134	}
	135	return -EINVAL;
	136	}
	137
	138	static int netxbig_led_blink_set(struct led_classdev *led_cdev,
	139	unsigned long *delay_on,
	140	unsigned long *delay_off)
	141	{
	142	struct netxbig_led_data *led_dat =
	143	container_of(led_cdev, struct netxbig_led_data, cdev);
	144	enum netxbig_led_mode mode;
	145	int mode_val;
	146	int ret;
	147
	148	/* Look for a LED mode with the requested timer frequency. */
	149	ret = netxbig_led_get_timer_mode(&mode, delay_on, delay_off,
	150	led_dat->timer, led_dat->num_timer);
	151	if (ret < 0)
	152	return ret;
	153
	154	mode_val = led_dat->mode_val[mode];
	155	if (mode_val == NETXBIG_LED_INVALID_MODE)
	156	return -EINVAL;
	157
	158	spin_lock_irq(&led_dat->lock);
	159
	160	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	161	led_dat->mode = mode;
	162
	163	spin_unlock_irq(&led_dat->lock);
	164
	165	return 0;
	166	}
	167
	168	static void netxbig_led_set(struct led_classdev *led_cdev,
	169	enum led_brightness value)
	170	{
	171	struct netxbig_led_data *led_dat =
	172	container_of(led_cdev, struct netxbig_led_data, cdev);
	173	enum netxbig_led_mode mode;
7b9d9d88	174	int mode_val;
24467832 SG	175	int set_brightness = 1;
	176	unsigned long flags;
	177
	178	spin_lock_irqsave(&led_dat->lock, flags);
	179
	180	if (value == LED_OFF) {
	181	mode = NETXBIG_LED_OFF;
	182	set_brightness = 0;
	183	} else {
	184	if (led_dat->sata)
	185	mode = NETXBIG_LED_SATA;
	186	else if (led_dat->mode == NETXBIG_LED_OFF)
	187	mode = NETXBIG_LED_ON;
	188	else /* Keep 'timer' mode. */
	189	mode = led_dat->mode;
	190	}
	191	mode_val = led_dat->mode_val[mode];
	192
	193	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	194	led_dat->mode = mode;
	195	/*
	196	* Note that the brightness register is shared between all the
	197	* SATA LEDs. So, change the brightness setting for a single
	198	* SATA LED will affect all the others.
	199	*/
7b9d9d88	200	if (set_brightness)
24467832	201	gpio_ext_set_value(led_dat->gpio_ext,
7b9d9d88	202	led_dat->bright_addr, value);
24467832 SG	203
	204	spin_unlock_irqrestore(&led_dat->lock, flags);
	205	}
	206
	207	static ssize_t netxbig_led_sata_store(struct device *dev,
	208	struct device_attribute *attr,
	209	const char *buff, size_t count)
	210	{
	211	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	212	struct netxbig_led_data *led_dat =
	213	container_of(led_cdev, struct netxbig_led_data, cdev);
	214	unsigned long enable;
	215	enum netxbig_led_mode mode;
	216	int mode_val;
	217	int ret;
	218
7517611a	219	ret = kstrtoul(buff, 10, &enable);
24467832 SG	220	if (ret < 0)
	221	return ret;
	222
	223	enable = !!enable;
	224
	225	spin_lock_irq(&led_dat->lock);
	226
	227	if (led_dat->sata == enable) {
	228	ret = count;
	229	goto exit_unlock;
	230	}
	231
	232	if (led_dat->mode != NETXBIG_LED_ON &&
	233	led_dat->mode != NETXBIG_LED_SATA)
	234	mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
	235	else if (enable)
	236	mode = NETXBIG_LED_SATA;
	237	else
	238	mode = NETXBIG_LED_ON;
	239
	240	mode_val = led_dat->mode_val[mode];
	241	if (mode_val == NETXBIG_LED_INVALID_MODE) {
	242	ret = -EINVAL;
	243	goto exit_unlock;
	244	}
	245
	246	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	247	led_dat->mode = mode;
	248	led_dat->sata = enable;
	249
	250	ret = count;
	251
	252	exit_unlock:
	253	spin_unlock_irq(&led_dat->lock);
	254
	255	return ret;
	256	}
	257
	258	static ssize_t netxbig_led_sata_show(struct device *dev,
	259	struct device_attribute attr, char buf)
	260	{
	261	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	262	struct netxbig_led_data *led_dat =
	263	container_of(led_cdev, struct netxbig_led_data, cdev);
	264
	265	return sprintf(buf, "%d\n", led_dat->sata);
	266	}
	267
	268	static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);
	269
588a6a99 JH	270	static struct attribute *netxbig_led_attrs[] = {
	271	&dev_attr_sata.attr,
	272	NULL
	273	};
	274	ATTRIBUTE_GROUPS(netxbig_led);
	275
cd010955 SG	276	static int create_netxbig_led(struct platform_device *pdev,
	277	struct netxbig_led_platform_data *pdata,
	278	struct netxbig_led_data *led_dat,
	279	const struct netxbig_led *template)
24467832	280	{
24467832 SG	281	spin_lock_init(&led_dat->lock);
	282	led_dat->gpio_ext = pdata->gpio_ext;
	283	led_dat->cdev.name = template->name;
	284	led_dat->cdev.default_trigger = template->default_trigger;
	285	led_dat->cdev.blink_set = netxbig_led_blink_set;
	286	led_dat->cdev.brightness_set = netxbig_led_set;
	287	/*
	288	* Because the GPIO extension bus don't allow to read registers
	289	* value, there is no way to probe the LED initial state.
	290	* So, the initial sysfs LED value for the "brightness" and "sata"
	291	* attributes are inconsistent.
	292	*
	293	* Note that the initial LED state can't be reconfigured.
	294	* The reason is that the LED behaviour must stay uniform during
	295	* the whole boot process (bootloader+linux).
	296	*/
	297	led_dat->sata = 0;
	298	led_dat->cdev.brightness = LED_OFF;
7b9d9d88	299	led_dat->cdev.max_brightness = template->bright_max;
24467832 SG	300	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
	301	led_dat->mode_addr = template->mode_addr;
	302	led_dat->mode_val = template->mode_val;
	303	led_dat->bright_addr = template->bright_addr;
24467832 SG	304	led_dat->timer = pdata->timer;
24467832 SG	305	led_dat->num_timer = pdata->num_timer;
0c86ac2c SG	306	/*
	307	* If available, expose the SATA activity blink capability through
	308	* a "sata" sysfs attribute.
	309	*/
	310	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
	311	led_dat->cdev.groups = netxbig_led_groups;
24467832	312
cd010955	313	return devm_led_classdev_register(&pdev->dev, &led_dat->cdev);
24467832 SG	314	}
24467832 SG	315
9af512e8 LW	316	/**
	317	* netxbig_gpio_ext_remove() - Clean up GPIO extension data
	318	* @data: managed resource data to clean up
	319	*
	320	* Since we pick GPIO descriptors from another device than the device our
	321	* driver is probing to, we need to register a specific callback to free
	322	* these up using managed resources.
	323	*/
	324	static void netxbig_gpio_ext_remove(void *data)
	325	{
	326	struct netxbig_gpio_ext *gpio_ext = data;
	327	int i;
	328
	329	for (i = 0; i < gpio_ext->num_addr; i++)
	330	gpiod_put(gpio_ext->addr[i]);
	331	for (i = 0; i < gpio_ext->num_data; i++)
	332	gpiod_put(gpio_ext->data[i]);
	333	gpiod_put(gpio_ext->enable);
	334	}
	335
	336	/**
	337	* netxbig_gpio_ext_get() - Obtain GPIO extension device data
	338	* @dev: main LED device
	339	* @gpio_ext_dev: the GPIO extension device
	340	* @gpio_ext: the data structure holding the GPIO extension data
	341	*
	342	* This function walks the subdevice that only contain GPIO line
	343	* handles in the device tree and obtains the GPIO descriptors from that
	344	* device.
	345	*/
	346	static int netxbig_gpio_ext_get(struct device *dev,
	347	struct device *gpio_ext_dev,
	348	struct netxbig_gpio_ext *gpio_ext)
2976b179	349	{
9af512e8	350	struct gpio_desc addr, data;
2976b179	351	int num_addr, num_data;
9af512e8	352	struct gpio_desc *gpiod;
2976b179 SG	353	int ret;
	354	int i;
	355
9af512e8	356	ret = gpiod_count(gpio_ext_dev, "addr");
2976b179 SG	357	if (ret < 0) {
	358	dev_err(dev,
	359	"Failed to count GPIOs in DT property addr-gpios\n");
	360	return ret;
	361	}
	362	num_addr = ret;
a86854d0	363	addr = devm_kcalloc(dev, num_addr, sizeof(*addr), GFP_KERNEL);
2976b179 SG	364	if (!addr)
	365	return -ENOMEM;
	366
9af512e8 LW	367	/*
	368	* We cannot use devm_ managed resources with these GPIO descriptors
	369	* since they are associated with the "GPIO extension device" which
	370	* does not probe any driver. The device tree parser will however
	371	* populate a platform device for it so we can anyway obtain the
	372	* GPIO descriptors from the device.
	373	*/
2976b179	374	for (i = 0; i < num_addr; i++) {
9af512e8 LW	375	gpiod = gpiod_get_index(gpio_ext_dev, "addr", i,
	376	GPIOD_OUT_LOW);
	377	if (IS_ERR(gpiod))
	378	return PTR_ERR(gpiod);
	379	gpiod_set_consumer_name(gpiod, "GPIO extension addr");
	380	addr[i] = gpiod;
2976b179 SG	381	}
	382	gpio_ext->addr = addr;
	383	gpio_ext->num_addr = num_addr;
	384
9af512e8	385	ret = gpiod_count(gpio_ext_dev, "data");
2976b179 SG	386	if (ret < 0) {
	387	dev_err(dev,
	388	"Failed to count GPIOs in DT property data-gpios\n");
	389	return ret;
	390	}
	391	num_data = ret;
a86854d0	392	data = devm_kcalloc(dev, num_data, sizeof(*data), GFP_KERNEL);
2976b179 SG	393	if (!data)
	394	return -ENOMEM;
	395
	396	for (i = 0; i < num_data; i++) {
9af512e8 LW	397	gpiod = gpiod_get_index(gpio_ext_dev, "data", i,
	398	GPIOD_OUT_LOW);
	399	if (IS_ERR(gpiod))
	400	return PTR_ERR(gpiod);
	401	gpiod_set_consumer_name(gpiod, "GPIO extension data");
	402	data[i] = gpiod;
2976b179 SG	403	}
	404	gpio_ext->data = data;
	405	gpio_ext->num_data = num_data;
	406
9af512e8 LW	407	gpiod = gpiod_get(gpio_ext_dev, "enable", GPIOD_OUT_LOW);
9af512e8 LW	408	if (IS_ERR(gpiod)) {
2976b179 SG	409	dev_err(dev,
2976b179 SG	410	"Failed to get GPIO from DT property enable-gpio\n");
9af512e8	411	return PTR_ERR(gpiod);
2976b179	412	}
9af512e8 LW	413	gpiod_set_consumer_name(gpiod, "GPIO extension enable");
9af512e8 LW	414	gpio_ext->enable = gpiod;
2976b179	415
9af512e8	416	return devm_add_action_or_reset(dev, netxbig_gpio_ext_remove, gpio_ext);
2976b179 SG	417	}
	418
	419	static int netxbig_leds_get_of_pdata(struct device *dev,
	420	struct netxbig_led_platform_data *pdata)
	421	{
	422	struct device_node *np = dev->of_node;
	423	struct device_node *gpio_ext_np;
9af512e8 LW	424	struct platform_device *gpio_ext_pdev;
9af512e8 LW	425	struct device *gpio_ext_dev;
2976b179 SG	426	struct device_node *child;
	427	struct netxbig_gpio_ext *gpio_ext;
	428	struct netxbig_led_timer *timers;
	429	struct netxbig_led leds, led;
	430	int num_timers;
	431	int num_leds = 0;
	432	int ret;
	433	int i;
	434
	435	/* GPIO extension */
	436	gpio_ext_np = of_parse_phandle(np, "gpio-ext", 0);
	437	if (!gpio_ext_np) {
	438	dev_err(dev, "Failed to get DT handle gpio-ext\n");
	439	return -EINVAL;
	440	}
9af512e8 LW	441	gpio_ext_pdev = of_find_device_by_node(gpio_ext_np);
	442	if (!gpio_ext_pdev) {
	443	dev_err(dev, "Failed to find platform device for gpio-ext\n");
	444	return -ENODEV;
	445	}
	446	gpio_ext_dev = &gpio_ext_pdev->dev;
2976b179 SG	447
2976b179 SG	448	gpio_ext = devm_kzalloc(dev, sizeof(*gpio_ext), GFP_KERNEL);
af7b6505 ND	449	if (!gpio_ext) {
af7b6505 ND	450	of_node_put(gpio_ext_np);
2976b179	451	return -ENOMEM;
af7b6505	452	}
9af512e8	453	ret = netxbig_gpio_ext_get(dev, gpio_ext_dev, gpio_ext);
af7b6505	454	of_node_put(gpio_ext_np);
2976b179 SG	455	if (ret)
2976b179 SG	456	return ret;
2976b179 SG	457	pdata->gpio_ext = gpio_ext;
	458
	459	/* Timers (optional) */
	460	ret = of_property_count_u32_elems(np, "timers");
	461	if (ret > 0) {
	462	if (ret % 3)
	463	return -EINVAL;
	464	num_timers = ret / 3;
a86854d0	465	timers = devm_kcalloc(dev, num_timers, sizeof(*timers),
2976b179 SG	466	GFP_KERNEL);
	467	if (!timers)
	468	return -ENOMEM;
	469	for (i = 0; i < num_timers; i++) {
	470	u32 tmp;
	471
	472	of_property_read_u32_index(np, "timers", 3 * i,
	473	&timers[i].mode);
	474	if (timers[i].mode >= NETXBIG_LED_MODE_NUM)
	475	return -EINVAL;
	476	of_property_read_u32_index(np, "timers",
	477	3 * i + 1, &tmp);
	478	timers[i].delay_on = tmp;
	479	of_property_read_u32_index(np, "timers",
	480	3 * i + 2, &tmp);
	481	timers[i].delay_off = tmp;
	482	}
	483	pdata->timer = timers;
	484	pdata->num_timer = num_timers;
	485	}
	486
	487	/* LEDs */
	488	num_leds = of_get_child_count(np);
	489	if (!num_leds) {
	490	dev_err(dev, "No LED subnodes found in DT\n");
	491	return -ENODEV;
	492	}
	493
a86854d0	494	leds = devm_kcalloc(dev, num_leds, sizeof(*leds), GFP_KERNEL);
2976b179 SG	495	if (!leds)
	496	return -ENOMEM;
	497
	498	led = leds;
	499	for_each_child_of_node(np, child) {
	500	const char *string;
	501	int *mode_val;
	502	int num_modes;
	503
	504	ret = of_property_read_u32(child, "mode-addr",
	505	&led->mode_addr);
	506	if (ret)
	507	goto err_node_put;
	508
	509	ret = of_property_read_u32(child, "bright-addr",
	510	&led->bright_addr);
	511	if (ret)
	512	goto err_node_put;
	513
	514	ret = of_property_read_u32(child, "max-brightness",
	515	&led->bright_max);
	516	if (ret)
	517	goto err_node_put;
	518
	519	mode_val =
a86854d0 KC	520	devm_kcalloc(dev,
a86854d0 KC	521	NETXBIG_LED_MODE_NUM, sizeof(*mode_val),
2976b179 SG	522	GFP_KERNEL);
	523	if (!mode_val) {
	524	ret = -ENOMEM;
	525	goto err_node_put;
	526	}
	527
	528	for (i = 0; i < NETXBIG_LED_MODE_NUM; i++)
	529	mode_val[i] = NETXBIG_LED_INVALID_MODE;
	530
	531	ret = of_property_count_u32_elems(child, "mode-val");
	532	if (ret < 0 \|\| ret % 2) {
	533	ret = -EINVAL;
	534	goto err_node_put;
	535	}
	536	num_modes = ret / 2;
	537	if (num_modes > NETXBIG_LED_MODE_NUM) {
	538	ret = -EINVAL;
	539	goto err_node_put;
	540	}
	541
	542	for (i = 0; i < num_modes; i++) {
	543	int mode;
	544	int val;
	545
	546	of_property_read_u32_index(child,
	547	"mode-val", 2 * i, &mode);
	548	of_property_read_u32_index(child,
	549	"mode-val", 2 * i + 1, &val);
	550	if (mode >= NETXBIG_LED_MODE_NUM) {
	551	ret = -EINVAL;
	552	goto err_node_put;
	553	}
	554	mode_val[mode] = val;
	555	}
	556	led->mode_val = mode_val;
	557
	558	if (!of_property_read_string(child, "label", &string))
	559	led->name = string;
	560	else
	561	led->name = child->name;
	562
	563	if (!of_property_read_string(child,
	564	"linux,default-trigger", &string))
	565	led->default_trigger = string;
	566
	567	led++;
	568	}
	569
	570	pdata->leds = leds;
	571	pdata->num_leds = num_leds;
	572
	573	return 0;
	574
	575	err_node_put:
	576	of_node_put(child);
	577	return ret;
	578	}
	579
	580	static const struct of_device_id of_netxbig_leds_match[] = {
	581	{ .compatible = "lacie,netxbig-leds", },
	582	{},
	583	};
825fe38a	584	MODULE_DEVICE_TABLE(of, of_netxbig_leds_match);
2976b179	585
98ea1ea2	586	static int netxbig_led_probe(struct platform_device *pdev)
24467832	587	{
156189a6	588	struct netxbig_led_platform_data *pdata;
cd010955	589	struct netxbig_led_data *leds_data;
24467832 SG	590	int i;
	591	int ret;
	592
156189a6 MY	593	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	594	if (!pdata)
	595	return -ENOMEM;
	596	ret = netxbig_leds_get_of_pdata(&pdev->dev, pdata);
	597	if (ret)
	598	return ret;
24467832	599
a86854d0 KC	600	leds_data = devm_kcalloc(&pdev->dev,
a86854d0 KC	601	pdata->num_leds, sizeof(*leds_data),
cd010955 SG	602	GFP_KERNEL);
cd010955 SG	603	if (!leds_data)
24467832 SG	604	return -ENOMEM;
24467832 SG	605
24467832	606	for (i = 0; i < pdata->num_leds; i++) {
cd010955 SG	607	ret = create_netxbig_led(pdev, pdata,
cd010955 SG	608	&leds_data[i], &pdata->leds[i]);
24467832	609	if (ret < 0)
cd010955	610	return ret;
24467832	611	}
24467832 SG	612
	613	return 0;
	614	}
	615
	616	static struct platform_driver netxbig_led_driver = {
	617	.probe = netxbig_led_probe,
24467832	618	.driver = {
2976b179	619	.name = "leds-netxbig",
156189a6	620	.of_match_table = of_netxbig_leds_match,
24467832 SG	621	},
24467832 SG	622	};
24467832	623
892a8843	624	module_platform_driver(netxbig_led_driver);
24467832 SG	625
	626	MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
	627	MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
	628	MODULE_LICENSE("GPL");
892a8843	629	MODULE_ALIAS("platform:leds-netxbig");