drivers/leds/leds-netxbig.c - kernel/msm-4.9 - Gitiles

 /*
  * leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
  *
  * Copyright (C) 2010 LaCie
  *
  * Author: Simon Guinot <sguinot@lacie.com>
  *
  * 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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */

 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/irq.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/platform_device.h>
 #include <linux/gpio.h>
 #include <linux/leds.h>
 #include <linux/platform_data/leds-kirkwood-netxbig.h>

 /*
  * 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++)
 		gpio_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++)
 		gpio_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. */
 	gpio_set_value(gpio_ext->enable, 0);
 	gpio_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);
 }

 static int __devinit gpio_ext_init(struct netxbig_gpio_ext *gpio_ext)
 {
 	int err;
 	int i;

 	if (unlikely(!gpio_ext))
 		return -EINVAL;

 	/* Configure address GPIOs. */
 	for (i = 0; i < gpio_ext->num_addr; i++) {
 		err = gpio_request_one(gpio_ext->addr[i], GPIOF_OUT_INIT_LOW,
 				       "GPIO extension addr");
 		if (err)
 			goto err_free_addr;
 	}
 	/* Configure data GPIOs. */
 	for (i = 0; i < gpio_ext->num_data; i++) {
 		err = gpio_request_one(gpio_ext->data[i], GPIOF_OUT_INIT_LOW,
 				   "GPIO extension data");
 		if (err)
 			goto err_free_data;
 	}
 	/* Configure "enable select" GPIO. */
 	err = gpio_request_one(gpio_ext->enable, GPIOF_OUT_INIT_LOW,
 			       "GPIO extension enable");
 	if (err)
 		goto err_free_data;

 	return 0;

 err_free_data:
 	for (i = i - 1; i >= 0; i--)
 		gpio_free(gpio_ext->data[i]);
 	i = gpio_ext->num_addr;
 err_free_addr:
 	for (i = i - 1; i >= 0; i--)
 		gpio_free(gpio_ext->addr[i]);

 	return err;
 }

 static void gpio_ext_free(struct netxbig_gpio_ext *gpio_ext)
 {
 	int i;

 	gpio_free(gpio_ext->enable);
 	for (i = gpio_ext->num_addr - 1; i >= 0; i--)
 		gpio_free(gpio_ext->addr[i]);
 	for (i = gpio_ext->num_data - 1; i >= 0; i--)
 		gpio_free(gpio_ext->data[i]);
 }

 /*
  * 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;
 	int			bright_max;
 	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, bright_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) {
 		bright_val = DIV_ROUND_UP(value * led_dat->bright_max,
 					  LED_FULL);
 		gpio_ext_set_value(led_dat->gpio_ext,
 				   led_dat->bright_addr, bright_val);
 	}

 	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 = strict_strtoul(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 void delete_netxbig_led(struct netxbig_led_data *led_dat)
 {
 	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
 		device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
 	led_classdev_unregister(&led_dat->cdev);
 }

 static int __devinit
 create_netxbig_led(struct platform_device *pdev,
 		   struct netxbig_led_data *led_dat,
 		   const struct netxbig_led *template)
 {
 	struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
 	int ret;

 	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.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->bright_max = (1 << pdata->gpio_ext->num_data) - 1;
 	led_dat->timer = pdata->timer;
 	led_dat->num_timer = pdata->num_timer;

 	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
 	if (ret < 0)
 		return ret;

 	/*
 	 * 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) {
 		ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
 		if (ret)
 			led_classdev_unregister(&led_dat->cdev);
 	}

 	return ret;
 }

 static int __devinit netxbig_led_probe(struct platform_device *pdev)
 {
 	struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
 	struct netxbig_led_data *leds_data;
 	int i;
 	int ret;

 	if (!pdata)
 		return -EINVAL;

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

 	ret = gpio_ext_init(pdata->gpio_ext);
 	if (ret < 0)
 		return ret;

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

 	platform_set_drvdata(pdev, leds_data);

 	return 0;

 err_free_leds:
 	for (i = i - 1; i >= 0; i--)
 		delete_netxbig_led(&leds_data[i]);

 	gpio_ext_free(pdata->gpio_ext);
 	return ret;
 }

 static int __devexit netxbig_led_remove(struct platform_device *pdev)
 {
 	struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
 	struct netxbig_led_data *leds_data;
 	int i;

 	leds_data = platform_get_drvdata(pdev);

 	for (i = 0; i < pdata->num_leds; i++)
 		delete_netxbig_led(&leds_data[i]);

 	gpio_ext_free(pdata->gpio_ext);

 	return 0;
 }

 static struct platform_driver netxbig_led_driver = {
 	.probe		= netxbig_led_probe,
 	.remove		= __devexit_p(netxbig_led_remove),
 	.driver		= {
 		.name	= "leds-netxbig",
 		.owner	= THIS_MODULE,
 	},
 };

 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");
	/*
	* leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
	*
	* Copyright (C) 2010 LaCie
	*
	* Author: Simon Guinot <sguinot@lacie.com>
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/irq.h>
	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include <linux/platform_device.h>
	#include <linux/gpio.h>
	#include <linux/leds.h>
	#include <linux/platform_data/leds-kirkwood-netxbig.h>

	/*
	* 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++)
	gpio_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++)
	gpio_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. */
	gpio_set_value(gpio_ext->enable, 0);
	gpio_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);
	}

	static int __devinit gpio_ext_init(struct netxbig_gpio_ext *gpio_ext)
	{
	int err;
	int i;

	if (unlikely(!gpio_ext))
	return -EINVAL;

	/* Configure address GPIOs. */
	for (i = 0; i < gpio_ext->num_addr; i++) {
	err = gpio_request_one(gpio_ext->addr[i], GPIOF_OUT_INIT_LOW,
	"GPIO extension addr");
	if (err)
	goto err_free_addr;
	}
	/* Configure data GPIOs. */
	for (i = 0; i < gpio_ext->num_data; i++) {
	err = gpio_request_one(gpio_ext->data[i], GPIOF_OUT_INIT_LOW,
	"GPIO extension data");
	if (err)
	goto err_free_data;
	}
	/* Configure "enable select" GPIO. */
	err = gpio_request_one(gpio_ext->enable, GPIOF_OUT_INIT_LOW,
	"GPIO extension enable");
	if (err)
	goto err_free_data;

	return 0;

	err_free_data:
	for (i = i - 1; i >= 0; i--)
	gpio_free(gpio_ext->data[i]);
	i = gpio_ext->num_addr;
	err_free_addr:
	for (i = i - 1; i >= 0; i--)
	gpio_free(gpio_ext->addr[i]);

	return err;
	}

	static void gpio_ext_free(struct netxbig_gpio_ext *gpio_ext)
	{
	int i;

	gpio_free(gpio_ext->enable);
	for (i = gpio_ext->num_addr - 1; i >= 0; i--)
	gpio_free(gpio_ext->addr[i]);
	for (i = gpio_ext->num_data - 1; i >= 0; i--)
	gpio_free(gpio_ext->data[i]);
	}

	/*
	* 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;
	int bright_max;
	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, bright_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) {
	bright_val = DIV_ROUND_UP(value * led_dat->bright_max,
	LED_FULL);
	gpio_ext_set_value(led_dat->gpio_ext,
	led_dat->bright_addr, bright_val);
	}

	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 = strict_strtoul(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 void delete_netxbig_led(struct netxbig_led_data *led_dat)
	{
	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
	device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
	led_classdev_unregister(&led_dat->cdev);
	}

	static int __devinit
	create_netxbig_led(struct platform_device *pdev,
	struct netxbig_led_data *led_dat,
	const struct netxbig_led *template)
	{
	struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
	int ret;

	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.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->bright_max = (1 << pdata->gpio_ext->num_data) - 1;
	led_dat->timer = pdata->timer;
	led_dat->num_timer = pdata->num_timer;

	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
	if (ret < 0)
	return ret;

	/*
	* 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) {
	ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
	if (ret)
	led_classdev_unregister(&led_dat->cdev);
	}

	return ret;
	}

	static int __devinit netxbig_led_probe(struct platform_device *pdev)
	{
	struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
	struct netxbig_led_data *leds_data;
	int i;
	int ret;

	if (!pdata)
	return -EINVAL;

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

	ret = gpio_ext_init(pdata->gpio_ext);
	if (ret < 0)
	return ret;

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

	platform_set_drvdata(pdev, leds_data);

	return 0;

	err_free_leds:
	for (i = i - 1; i >= 0; i--)
	delete_netxbig_led(&leds_data[i]);

	gpio_ext_free(pdata->gpio_ext);
	return ret;
	}

	static int __devexit netxbig_led_remove(struct platform_device *pdev)
	{
	struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
	struct netxbig_led_data *leds_data;
	int i;

	leds_data = platform_get_drvdata(pdev);

	for (i = 0; i < pdata->num_leds; i++)
	delete_netxbig_led(&leds_data[i]);

	gpio_ext_free(pdata->gpio_ext);

	return 0;
	}

	static struct platform_driver netxbig_led_driver = {
	.probe = netxbig_led_probe,
	.remove = __devexit_p(netxbig_led_remove),
	.driver = {
	.name = "leds-netxbig",
	.owner = THIS_MODULE,
	},
	};

	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");