[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / leds / leds-netxbig.c

/*
 * 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 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 = 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 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
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 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 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		= 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");
Commit	Line	Data
24467832 SG	1	/*
	2	* leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
	3	*
	4	* Copyright (C) 2010 LaCie
	5	*
	6	* Author: Simon Guinot <sguinot@lacie.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/init.h>
	25	#include <linux/irq.h>
	26	#include <linux/slab.h>
	27	#include <linux/spinlock.h>
	28	#include <linux/platform_device.h>
	29	#include <linux/gpio.h>
	30	#include <linux/leds.h>
c02cecb9	31	#include <linux/platform_data/leds-kirkwood-netxbig.h>
24467832 SG	32
	33	/*
	34	* GPIO extension bus.
	35	*/
	36
	37	static DEFINE_SPINLOCK(gpio_ext_lock);
	38
	39	static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
	40	{
	41	int pin;
	42
	43	for (pin = 0; pin < gpio_ext->num_addr; pin++)
	44	gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
	45	}
	46
	47	static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
	48	{
	49	int pin;
	50
	51	for (pin = 0; pin < gpio_ext->num_data; pin++)
	52	gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1);
	53	}
	54
	55	static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
	56	{
	57	/* Enable select is done on the raising edge. */
	58	gpio_set_value(gpio_ext->enable, 0);
	59	gpio_set_value(gpio_ext->enable, 1);
	60	}
	61
	62	static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
	63	int addr, int value)
	64	{
	65	unsigned long flags;
	66
	67	spin_lock_irqsave(&gpio_ext_lock, flags);
	68	gpio_ext_set_addr(gpio_ext, addr);
	69	gpio_ext_set_data(gpio_ext, value);
	70	gpio_ext_enable_select(gpio_ext);
	71	spin_unlock_irqrestore(&gpio_ext_lock, flags);
	72	}
	73
98ea1ea2	74	static int gpio_ext_init(struct netxbig_gpio_ext *gpio_ext)
24467832 SG	75	{
	76	int err;
	77	int i;
	78
	79	if (unlikely(!gpio_ext))
	80	return -EINVAL;
	81
	82	/* Configure address GPIOs. */
	83	for (i = 0; i < gpio_ext->num_addr; i++) {
b96a573f AL	84	err = gpio_request_one(gpio_ext->addr[i], GPIOF_OUT_INIT_LOW,
b96a573f AL	85	"GPIO extension addr");
24467832 SG	86	if (err)
24467832 SG	87	goto err_free_addr;
24467832 SG	88	}
	89	/* Configure data GPIOs. */
	90	for (i = 0; i < gpio_ext->num_data; i++) {
b96a573f AL	91	err = gpio_request_one(gpio_ext->data[i], GPIOF_OUT_INIT_LOW,
b96a573f AL	92	"GPIO extension data");
24467832 SG	93	if (err)
24467832 SG	94	goto err_free_data;
24467832 SG	95	}
24467832 SG	96	/* Configure "enable select" GPIO. */
b96a573f AL	97	err = gpio_request_one(gpio_ext->enable, GPIOF_OUT_INIT_LOW,
b96a573f AL	98	"GPIO extension enable");
24467832 SG	99	if (err)
24467832 SG	100	goto err_free_data;
24467832 SG	101
	102	return 0;
	103
	104	err_free_data:
	105	for (i = i - 1; i >= 0; i--)
	106	gpio_free(gpio_ext->data[i]);
	107	i = gpio_ext->num_addr;
	108	err_free_addr:
	109	for (i = i - 1; i >= 0; i--)
	110	gpio_free(gpio_ext->addr[i]);
	111
	112	return err;
	113	}
	114
b8cd742a	115	static void gpio_ext_free(struct netxbig_gpio_ext *gpio_ext)
24467832 SG	116	{
	117	int i;
	118
	119	gpio_free(gpio_ext->enable);
	120	for (i = gpio_ext->num_addr - 1; i >= 0; i--)
	121	gpio_free(gpio_ext->addr[i]);
	122	for (i = gpio_ext->num_data - 1; i >= 0; i--)
	123	gpio_free(gpio_ext->data[i]);
	124	}
	125
	126	/*
	127	* Class LED driver.
	128	*/
	129
	130	struct netxbig_led_data {
	131	struct netxbig_gpio_ext *gpio_ext;
	132	struct led_classdev cdev;
	133	int mode_addr;
	134	int *mode_val;
	135	int bright_addr;
	136	int bright_max;
	137	struct netxbig_led_timer *timer;
	138	int num_timer;
	139	enum netxbig_led_mode mode;
	140	int sata;
	141	spinlock_t lock;
	142	};
	143
	144	static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
	145	unsigned long delay_on,
	146	unsigned long delay_off,
	147	struct netxbig_led_timer *timer,
	148	int num_timer)
	149	{
	150	int i;
	151
	152	for (i = 0; i < num_timer; i++) {
	153	if (timer[i].delay_on == delay_on &&
	154	timer[i].delay_off == delay_off) {
	155	*mode = timer[i].mode;
	156	return 0;
	157	}
	158	}
	159	return -EINVAL;
	160	}
	161
	162	static int netxbig_led_blink_set(struct led_classdev *led_cdev,
	163	unsigned long *delay_on,
	164	unsigned long *delay_off)
	165	{
	166	struct netxbig_led_data *led_dat =
	167	container_of(led_cdev, struct netxbig_led_data, cdev);
	168	enum netxbig_led_mode mode;
	169	int mode_val;
	170	int ret;
	171
	172	/* Look for a LED mode with the requested timer frequency. */
	173	ret = netxbig_led_get_timer_mode(&mode, delay_on, delay_off,
	174	led_dat->timer, led_dat->num_timer);
	175	if (ret < 0)
	176	return ret;
	177
	178	mode_val = led_dat->mode_val[mode];
	179	if (mode_val == NETXBIG_LED_INVALID_MODE)
180	return -EINVAL;
181
182	spin_lock_irq(&led_dat->lock);
183
184	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
185	led_dat->mode = mode;
186
187	spin_unlock_irq(&led_dat->lock);
188
189	return 0;
190	}
191
192	static void netxbig_led_set(struct led_classdev *led_cdev,
193	enum led_brightness value)
194	{
195	struct netxbig_led_data *led_dat =
196	container_of(led_cdev, struct netxbig_led_data, cdev);
197	enum netxbig_led_mode mode;
198	int mode_val, bright_val;
199	int set_brightness = 1;
200	unsigned long flags;
201
202	spin_lock_irqsave(&led_dat->lock, flags);
203
204	if (value == LED_OFF) {
205	mode = NETXBIG_LED_OFF;
206	set_brightness = 0;
207	} else {
208	if (led_dat->sata)
209	mode = NETXBIG_LED_SATA;
210	else if (led_dat->mode == NETXBIG_LED_OFF)
211	mode = NETXBIG_LED_ON;
212	else /* Keep 'timer' mode. */
213	mode = led_dat->mode;
214	}
215	mode_val = led_dat->mode_val[mode];
216
217	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
218	led_dat->mode = mode;
219	/*
220	* Note that the brightness register is shared between all the
221	* SATA LEDs. So, change the brightness setting for a single
222	* SATA LED will affect all the others.
223	*/
224	if (set_brightness) {
225	bright_val = DIV_ROUND_UP(value * led_dat->bright_max,
226	LED_FULL);
227	gpio_ext_set_value(led_dat->gpio_ext,
228	led_dat->bright_addr, bright_val);
229	}
230
231	spin_unlock_irqrestore(&led_dat->lock, flags);
232	}
233
234	static ssize_t netxbig_led_sata_store(struct device *dev,
235	struct device_attribute *attr,
236	const char *buff, size_t count)
237	{
238	struct led_classdev *led_cdev = dev_get_drvdata(dev);
239	struct netxbig_led_data *led_dat =
240	container_of(led_cdev, struct netxbig_led_data, cdev);
241	unsigned long enable;
242	enum netxbig_led_mode mode;
243	int mode_val;
244	int ret;
245
7517611a	246	ret = kstrtoul(buff, 10, &enable);
24467832 SG	247	if (ret < 0)
	248	return ret;
	249
	250	enable = !!enable;
	251
	252	spin_lock_irq(&led_dat->lock);
	253
	254	if (led_dat->sata == enable) {
	255	ret = count;
	256	goto exit_unlock;
	257	}
	258
	259	if (led_dat->mode != NETXBIG_LED_ON &&
	260	led_dat->mode != NETXBIG_LED_SATA)
	261	mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
	262	else if (enable)
	263	mode = NETXBIG_LED_SATA;
	264	else
	265	mode = NETXBIG_LED_ON;
	266
	267	mode_val = led_dat->mode_val[mode];
	268	if (mode_val == NETXBIG_LED_INVALID_MODE) {
	269	ret = -EINVAL;
	270	goto exit_unlock;
	271	}
	272
	273	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	274	led_dat->mode = mode;
	275	led_dat->sata = enable;
	276
	277	ret = count;
	278
	279	exit_unlock:
	280	spin_unlock_irq(&led_dat->lock);
	281
	282	return ret;
	283	}
	284
	285	static ssize_t netxbig_led_sata_show(struct device *dev,
	286	struct device_attribute attr, char buf)
	287	{
	288	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	289	struct netxbig_led_data *led_dat =
	290	container_of(led_cdev, struct netxbig_led_data, cdev);
	291
	292	return sprintf(buf, "%d\n", led_dat->sata);
	293	}
	294
	295	static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);
	296
b8cd742a	297	static void delete_netxbig_led(struct netxbig_led_data *led_dat)
24467832 SG	298	{
	299	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
	300	device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
	301	led_classdev_unregister(&led_dat->cdev);
	302	}
	303
98ea1ea2	304	static int
24467832 SG	305	create_netxbig_led(struct platform_device *pdev,
	306	struct netxbig_led_data *led_dat,
	307	const struct netxbig_led *template)
	308	{
	309	struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
	310	int ret;
	311
	312	spin_lock_init(&led_dat->lock);
	313	led_dat->gpio_ext = pdata->gpio_ext;
	314	led_dat->cdev.name = template->name;
	315	led_dat->cdev.default_trigger = template->default_trigger;
	316	led_dat->cdev.blink_set = netxbig_led_blink_set;
	317	led_dat->cdev.brightness_set = netxbig_led_set;
	318	/*
	319	* Because the GPIO extension bus don't allow to read registers
	320	* value, there is no way to probe the LED initial state.
	321	* So, the initial sysfs LED value for the "brightness" and "sata"
	322	* attributes are inconsistent.
	323	*
	324	* Note that the initial LED state can't be reconfigured.
	325	* The reason is that the LED behaviour must stay uniform during
	326	* the whole boot process (bootloader+linux).
	327	*/
	328	led_dat->sata = 0;
	329	led_dat->cdev.brightness = LED_OFF;
	330	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
	331	led_dat->mode_addr = template->mode_addr;
	332	led_dat->mode_val = template->mode_val;
	333	led_dat->bright_addr = template->bright_addr;
	334	led_dat->bright_max = (1 << pdata->gpio_ext->num_data) - 1;
	335	led_dat->timer = pdata->timer;
	336	led_dat->num_timer = pdata->num_timer;
	337
	338	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
	339	if (ret < 0)
	340	return ret;
	341
	342	/*
	343	* If available, expose the SATA activity blink capability through
	344	* a "sata" sysfs attribute.
	345	*/
	346	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE) {
	347	ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
	348	if (ret)
	349	led_classdev_unregister(&led_dat->cdev);
	350	}
	351
	352	return ret;
	353	}
	354
98ea1ea2	355	static int netxbig_led_probe(struct platform_device *pdev)
24467832 SG	356	{
	357	struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
	358	struct netxbig_led_data *leds_data;
	359	int i;
	360	int ret;
	361
	362	if (!pdata)
	363	return -EINVAL;
	364
8095c385 BW	365	leds_data = devm_kzalloc(&pdev->dev,
8095c385 BW	366	sizeof(struct netxbig_led_data) * pdata->num_leds, GFP_KERNEL);
24467832 SG	367	if (!leds_data)
	368	return -ENOMEM;
	369
	370	ret = gpio_ext_init(pdata->gpio_ext);
	371	if (ret < 0)
8095c385	372	return ret;
24467832 SG	373
	374	for (i = 0; i < pdata->num_leds; i++) {
	375	ret = create_netxbig_led(pdev, &leds_data[i], &pdata->leds[i]);
	376	if (ret < 0)
	377	goto err_free_leds;
	378	}
	379
	380	platform_set_drvdata(pdev, leds_data);
	381
	382	return 0;
	383
	384	err_free_leds:
	385	for (i = i - 1; i >= 0; i--)
	386	delete_netxbig_led(&leds_data[i]);
	387
	388	gpio_ext_free(pdata->gpio_ext);
24467832 SG	389	return ret;
	390	}
	391
678e8a6b	392	static int netxbig_led_remove(struct platform_device *pdev)
24467832 SG	393	{
	394	struct netxbig_led_platform_data *pdata = pdev->dev.platform_data;
	395	struct netxbig_led_data *leds_data;
	396	int i;
	397
	398	leds_data = platform_get_drvdata(pdev);
	399
	400	for (i = 0; i < pdata->num_leds; i++)
	401	delete_netxbig_led(&leds_data[i]);
	402
	403	gpio_ext_free(pdata->gpio_ext);
24467832 SG	404
	405	return 0;
	406	}
	407
	408	static struct platform_driver netxbig_led_driver = {
	409	.probe = netxbig_led_probe,
df07cf81	410	.remove = netxbig_led_remove,
24467832 SG	411	.driver = {
	412	.name = "leds-netxbig",
	413	.owner = THIS_MODULE,
	414	},
	415	};
24467832	416
892a8843	417	module_platform_driver(netxbig_led_driver);
24467832 SG	418
	419	MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
	420	MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
	421	MODULE_LICENSE("GPL");
892a8843	422	MODULE_ALIAS("platform:leds-netxbig");