[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / leds / leds-ns2.c

/*
 * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
 *
 * Copyright (C) 2010 LaCie
 *
 * Author: Simon Guinot <sguinot@lacie.com>
 *
 * Based on leds-gpio.c by Raphael Assenat <raph@8d.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/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_data/leds-kirkwood-ns2.h>
#include <linux/of_gpio.h>

/*
 * The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
 * relation with the SATA activity. This capability is exposed through the
 * "sata" sysfs attribute.
 *
 * The following array detail the different LED registers and the combination
 * of their possible values:
 *
 *  cmd_led   |  slow_led  | /SATA active | LED state
 *            |            |              |
 *     1      |     0      |      x       |  off
 *     -      |     1      |      x       |  on
 *     0      |     0      |      1       |  on
 *     0      |     0      |      0       |  blink (rate 300ms)
 */

enum ns2_led_modes {
	NS_V2_LED_OFF,
	NS_V2_LED_ON,
	NS_V2_LED_SATA,
};

struct ns2_led_mode_value {
	enum ns2_led_modes	mode;
	int			cmd_level;
	int			slow_level;
};

static struct ns2_led_mode_value ns2_led_modval[] = {
	{ NS_V2_LED_OFF	, 1, 0 },
	{ NS_V2_LED_ON	, 0, 1 },
	{ NS_V2_LED_ON	, 1, 1 },
	{ NS_V2_LED_SATA, 0, 0 },
};

struct ns2_led_data {
	struct led_classdev	cdev;
	unsigned		cmd;
	unsigned		slow;
	unsigned char		sata; /* True when SATA mode active. */
	rwlock_t		rw_lock; /* Lock GPIOs. */
};

static int ns2_led_get_mode(struct ns2_led_data *led_dat,
			    enum ns2_led_modes *mode)
{
	int i;
	int ret = -EINVAL;
	int cmd_level;
	int slow_level;

	read_lock_irq(&led_dat->rw_lock);

	cmd_level = gpio_get_value(led_dat->cmd);
	slow_level = gpio_get_value(led_dat->slow);

	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
		if (cmd_level == ns2_led_modval[i].cmd_level &&
		    slow_level == ns2_led_modval[i].slow_level) {
			*mode = ns2_led_modval[i].mode;
			ret = 0;
			break;
		}
	}

	read_unlock_irq(&led_dat->rw_lock);

	return ret;
}

static void ns2_led_set_mode(struct ns2_led_data *led_dat,
			     enum ns2_led_modes mode)
{
	int i;
	unsigned long flags;

	write_lock_irqsave(&led_dat->rw_lock, flags);

	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
		if (mode == ns2_led_modval[i].mode) {
			gpio_set_value(led_dat->cmd,
				       ns2_led_modval[i].cmd_level);
			gpio_set_value(led_dat->slow,
				       ns2_led_modval[i].slow_level);
		}
	}

	write_unlock_irqrestore(&led_dat->rw_lock, flags);
}

static void ns2_led_set(struct led_classdev *led_cdev,
			enum led_brightness value)
{
	struct ns2_led_data *led_dat =
		container_of(led_cdev, struct ns2_led_data, cdev);
	enum ns2_led_modes mode;

	if (value == LED_OFF)
		mode = NS_V2_LED_OFF;
	else if (led_dat->sata)
		mode = NS_V2_LED_SATA;
	else
		mode = NS_V2_LED_ON;

	ns2_led_set_mode(led_dat, mode);
}

static ssize_t ns2_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 ns2_led_data *led_dat =
		container_of(led_cdev, struct ns2_led_data, cdev);
	int ret;
	unsigned long enable;
	enum ns2_led_modes mode;

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

	enable = !!enable;

	if (led_dat->sata == enable)
		return count;

	ret = ns2_led_get_mode(led_dat, &mode);
	if (ret < 0)
		return ret;

	if (enable && mode == NS_V2_LED_ON)
		ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
	if (!enable && mode == NS_V2_LED_SATA)
		ns2_led_set_mode(led_dat, NS_V2_LED_ON);

	led_dat->sata = enable;

	return count;
}

static ssize_t ns2_led_sata_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct ns2_led_data *led_dat =
		container_of(led_cdev, struct ns2_led_data, cdev);

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

static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);

static int
create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
	       const struct ns2_led *template)
{
	int ret;
	enum ns2_led_modes mode;

	ret = devm_gpio_request_one(&pdev->dev, template->cmd,
			gpio_get_value(template->cmd) ?
			GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
			template->name);
	if (ret) {
		dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
			template->name);
		return ret;
	}

	ret = devm_gpio_request_one(&pdev->dev, template->slow,
			gpio_get_value(template->slow) ?
			GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
			template->name);
	if (ret) {
		dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
			template->name);
		return ret;
	}

	rwlock_init(&led_dat->rw_lock);

	led_dat->cdev.name = template->name;
	led_dat->cdev.default_trigger = template->default_trigger;
	led_dat->cdev.blink_set = NULL;
	led_dat->cdev.brightness_set = ns2_led_set;
	led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
	led_dat->cmd = template->cmd;
	led_dat->slow = template->slow;

	ret = ns2_led_get_mode(led_dat, &mode);
	if (ret < 0)
		return ret;

	/* Set LED initial state. */
	led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
	led_dat->cdev.brightness =
		(mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;

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

	ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
	if (ret < 0)
		goto err_free_cdev;

	return 0;

err_free_cdev:
	led_classdev_unregister(&led_dat->cdev);
	return ret;
}

static void delete_ns2_led(struct ns2_led_data *led_dat)
{
	device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
	led_classdev_unregister(&led_dat->cdev);
}

#ifdef CONFIG_OF_GPIO
/*
 * Translate OpenFirmware node properties into platform_data.
 */
static int
ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
{
	struct device_node *np = dev->of_node;
	struct device_node *child;
	struct ns2_led *leds;
	int num_leds = 0;
	int i = 0;

	num_leds = of_get_child_count(np);
	if (!num_leds)
		return -ENODEV;

	leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
			    GFP_KERNEL);
	if (!leds)
		return -ENOMEM;

	for_each_child_of_node(np, child) {
		const char *string;
		int ret;

		ret = of_get_named_gpio(child, "cmd-gpio", 0);
		if (ret < 0)
			return ret;
		leds[i].cmd = ret;
		ret = of_get_named_gpio(child, "slow-gpio", 0);
		if (ret < 0)
			return ret;
		leds[i].slow = ret;
		ret = of_property_read_string(child, "label", &string);
		leds[i].name = (ret == 0) ? string : child->name;
		ret = of_property_read_string(child, "linux,default-trigger",
					      &string);
		if (ret == 0)
			leds[i].default_trigger = string;

		i++;
	}

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

	return 0;
}

static const struct of_device_id of_ns2_leds_match[] = {
	{ .compatible = "lacie,ns2-leds", },
	{},
};
#endif /* CONFIG_OF_GPIO */

struct ns2_led_priv {
	int num_leds;
	struct ns2_led_data leds_data[];
};

static inline int sizeof_ns2_led_priv(int num_leds)
{
	return sizeof(struct ns2_led_priv) +
		      (sizeof(struct ns2_led_data) * num_leds);
}

static int ns2_led_probe(struct platform_device *pdev)
{
	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
	struct ns2_led_priv *priv;
	int i;
	int ret;

#ifdef CONFIG_OF_GPIO
	if (!pdata) {
		pdata = devm_kzalloc(&pdev->dev,
				     sizeof(struct ns2_led_platform_data),
				     GFP_KERNEL);
		if (!pdata)
			return -ENOMEM;

		ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
		if (ret)
			return ret;
	}
#else
	if (!pdata)
		return -EINVAL;
#endif /* CONFIG_OF_GPIO */

	priv = devm_kzalloc(&pdev->dev,
			    sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;
	priv->num_leds = pdata->num_leds;

	for (i = 0; i < priv->num_leds; i++) {
		ret = create_ns2_led(pdev, &priv->leds_data[i],
				     &pdata->leds[i]);
		if (ret < 0) {
			for (i = i - 1; i >= 0; i--)
				delete_ns2_led(&priv->leds_data[i]);
			return ret;
		}
	}

	platform_set_drvdata(pdev, priv);

	return 0;
}

static int ns2_led_remove(struct platform_device *pdev)
{
	int i;
	struct ns2_led_priv *priv;

	priv = platform_get_drvdata(pdev);

	for (i = 0; i < priv->num_leds; i++)
		delete_ns2_led(&priv->leds_data[i]);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver ns2_led_driver = {
	.probe		= ns2_led_probe,
	.remove		= ns2_led_remove,
	.driver		= {
		.name		= "leds-ns2",
		.owner		= THIS_MODULE,
		.of_match_table	= of_match_ptr(of_ns2_leds_match),
	},
};

module_platform_driver(ns2_led_driver);

MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
MODULE_DESCRIPTION("Network Space v2 LED driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:leds-ns2");
Commit	Line	Data
11efe71f SG	1	/*
	2	* leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
	3	*
	4	* Copyright (C) 2010 LaCie
	5	*
	6	* Author: Simon Guinot <sguinot@lacie.com>
	7	*
	8	* Based on leds-gpio.c by Raphael Assenat <raph@8d.com>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*/
	24
	25	#include <linux/kernel.h>
	26	#include <linux/init.h>
	27	#include <linux/platform_device.h>
	28	#include <linux/slab.h>
	29	#include <linux/gpio.h>
	30	#include <linux/leds.h>
54f4dedb	31	#include <linux/module.h>
c02cecb9	32	#include <linux/platform_data/leds-kirkwood-ns2.h>
72052fcc	33	#include <linux/of_gpio.h>
11efe71f SG	34
	35	/*
	36	* The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
	37	* relation with the SATA activity. This capability is exposed through the
	38	* "sata" sysfs attribute.
	39	*
	40	* The following array detail the different LED registers and the combination
	41	* of their possible values:
	42	*
	43	* cmd_led \| slow_led \| /SATA active \| LED state
	44	* \| \| \|
	45	* 1 \| 0 \| x \| off
	46	* - \| 1 \| x \| on
	47	* 0 \| 0 \| 1 \| on
	48	* 0 \| 0 \| 0 \| blink (rate 300ms)
	49	*/
	50
	51	enum ns2_led_modes {
	52	NS_V2_LED_OFF,
	53	NS_V2_LED_ON,
	54	NS_V2_LED_SATA,
	55	};
	56
	57	struct ns2_led_mode_value {
	58	enum ns2_led_modes mode;
	59	int cmd_level;
	60	int slow_level;
	61	};
	62
	63	static struct ns2_led_mode_value ns2_led_modval[] = {
	64	{ NS_V2_LED_OFF , 1, 0 },
	65	{ NS_V2_LED_ON , 0, 1 },
	66	{ NS_V2_LED_ON , 1, 1 },
	67	{ NS_V2_LED_SATA, 0, 0 },
	68	};
	69
	70	struct ns2_led_data {
	71	struct led_classdev cdev;
	72	unsigned cmd;
	73	unsigned slow;
	74	unsigned char sata; /* True when SATA mode active. */
	75	rwlock_t rw_lock; /* Lock GPIOs. */
	76	};
	77
	78	static int ns2_led_get_mode(struct ns2_led_data *led_dat,
	79	enum ns2_led_modes *mode)
	80	{
	81	int i;
	82	int ret = -EINVAL;
	83	int cmd_level;
	84	int slow_level;
	85
f539dfed	86	read_lock_irq(&led_dat->rw_lock);
11efe71f SG	87
	88	cmd_level = gpio_get_value(led_dat->cmd);
	89	slow_level = gpio_get_value(led_dat->slow);
	90
	91	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
	92	if (cmd_level == ns2_led_modval[i].cmd_level &&
	93	slow_level == ns2_led_modval[i].slow_level) {
	94	*mode = ns2_led_modval[i].mode;
	95	ret = 0;
	96	break;
	97	}
	98	}
	99
f539dfed	100	read_unlock_irq(&led_dat->rw_lock);
11efe71f SG	101
	102	return ret;
	103	}
	104
	105	static void ns2_led_set_mode(struct ns2_led_data *led_dat,
	106	enum ns2_led_modes mode)
	107	{
	108	int i;
f539dfed	109	unsigned long flags;
11efe71f	110
f539dfed	111	write_lock_irqsave(&led_dat->rw_lock, flags);
11efe71f SG	112
	113	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
	114	if (mode == ns2_led_modval[i].mode) {
	115	gpio_set_value(led_dat->cmd,
	116	ns2_led_modval[i].cmd_level);
	117	gpio_set_value(led_dat->slow,
	118	ns2_led_modval[i].slow_level);
	119	}
	120	}
	121
f539dfed	122	write_unlock_irqrestore(&led_dat->rw_lock, flags);
11efe71f SG	123	}
	124
	125	static void ns2_led_set(struct led_classdev *led_cdev,
	126	enum led_brightness value)
	127	{
	128	struct ns2_led_data *led_dat =
	129	container_of(led_cdev, struct ns2_led_data, cdev);
	130	enum ns2_led_modes mode;
	131
	132	if (value == LED_OFF)
	133	mode = NS_V2_LED_OFF;
	134	else if (led_dat->sata)
	135	mode = NS_V2_LED_SATA;
	136	else
	137	mode = NS_V2_LED_ON;
	138
	139	ns2_led_set_mode(led_dat, mode);
	140	}
	141
	142	static ssize_t ns2_led_sata_store(struct device *dev,
	143	struct device_attribute *attr,
	144	const char *buff, size_t count)
	145	{
e5971bbc SG	146	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	147	struct ns2_led_data *led_dat =
	148	container_of(led_cdev, struct ns2_led_data, cdev);
11efe71f SG	149	int ret;
	150	unsigned long enable;
	151	enum ns2_led_modes mode;
11efe71f	152
3874350c	153	ret = kstrtoul(buff, 10, &enable);
11efe71f SG	154	if (ret < 0)
	155	return ret;
	156
	157	enable = !!enable;
	158
	159	if (led_dat->sata == enable)
	160	return count;
	161
	162	ret = ns2_led_get_mode(led_dat, &mode);
	163	if (ret < 0)
	164	return ret;
	165
	166	if (enable && mode == NS_V2_LED_ON)
	167	ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
	168	if (!enable && mode == NS_V2_LED_SATA)
	169	ns2_led_set_mode(led_dat, NS_V2_LED_ON);
	170
	171	led_dat->sata = enable;
	172
	173	return count;
	174	}
	175
	176	static ssize_t ns2_led_sata_show(struct device *dev,
	177	struct device_attribute attr, char buf)
	178	{
e5971bbc SG	179	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	180	struct ns2_led_data *led_dat =
	181	container_of(led_cdev, struct ns2_led_data, cdev);
11efe71f SG	182
	183	return sprintf(buf, "%d\n", led_dat->sata);
	184	}
	185
	186	static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
	187
98ea1ea2	188	static int
11efe71f SG	189	create_ns2_led(struct platform_device pdev, struct ns2_led_data led_dat,
	190	const struct ns2_led *template)
	191	{
	192	int ret;
	193	enum ns2_led_modes mode;
	194
04195823	195	ret = devm_gpio_request_one(&pdev->dev, template->cmd,
9d04cbaa JH	196	gpio_get_value(template->cmd) ?
9d04cbaa JH	197	GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
31c3dc74	198	template->name);
11efe71f SG	199	if (ret) {
	200	dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
	201	template->name);
31c3dc74	202	return ret;
11efe71f SG	203	}
11efe71f SG	204
04195823	205	ret = devm_gpio_request_one(&pdev->dev, template->slow,
9d04cbaa JH	206	gpio_get_value(template->slow) ?
9d04cbaa JH	207	GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
31c3dc74	208	template->name);
11efe71f SG	209	if (ret) {
	210	dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
	211	template->name);
04195823	212	return ret;
11efe71f SG	213	}
	214
	215	rwlock_init(&led_dat->rw_lock);
	216
	217	led_dat->cdev.name = template->name;
	218	led_dat->cdev.default_trigger = template->default_trigger;
	219	led_dat->cdev.blink_set = NULL;
	220	led_dat->cdev.brightness_set = ns2_led_set;
	221	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
	222	led_dat->cmd = template->cmd;
	223	led_dat->slow = template->slow;
	224
	225	ret = ns2_led_get_mode(led_dat, &mode);
	226	if (ret < 0)
04195823	227	return ret;
11efe71f SG	228
	229	/* Set LED initial state. */
	230	led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
	231	led_dat->cdev.brightness =
	232	(mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
	233
	234	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
	235	if (ret < 0)
04195823	236	return ret;
11efe71f	237
11efe71f SG	238	ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
	239	if (ret < 0)
	240	goto err_free_cdev;
	241
	242	return 0;
	243
	244	err_free_cdev:
	245	led_classdev_unregister(&led_dat->cdev);
11efe71f SG	246	return ret;
	247	}
	248
b8cd742a	249	static void delete_ns2_led(struct ns2_led_data *led_dat)
11efe71f SG	250	{
	251	device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
	252	led_classdev_unregister(&led_dat->cdev);
11efe71f SG	253	}
11efe71f SG	254
72052fcc SG	255	#ifdef CONFIG_OF_GPIO
	256	/*
	257	* Translate OpenFirmware node properties into platform_data.
	258	*/
cf4af012	259	static int
72052fcc SG	260	ns2_leds_get_of_pdata(struct device dev, struct ns2_led_platform_data pdata)
	261	{
	262	struct device_node *np = dev->of_node;
	263	struct device_node *child;
	264	struct ns2_led *leds;
	265	int num_leds = 0;
	266	int i = 0;
	267
	268	num_leds = of_get_child_count(np);
	269	if (!num_leds)
	270	return -ENODEV;
	271
	272	leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
	273	GFP_KERNEL);
	274	if (!leds)
	275	return -ENOMEM;
	276
	277	for_each_child_of_node(np, child) {
	278	const char *string;
	279	int ret;
	280
	281	ret = of_get_named_gpio(child, "cmd-gpio", 0);
	282	if (ret < 0)
	283	return ret;
	284	leds[i].cmd = ret;
	285	ret = of_get_named_gpio(child, "slow-gpio", 0);
	286	if (ret < 0)
	287	return ret;
	288	leds[i].slow = ret;
	289	ret = of_property_read_string(child, "label", &string);
	290	leds[i].name = (ret == 0) ? string : child->name;
	291	ret = of_property_read_string(child, "linux,default-trigger",
	292	&string);
	293	if (ret == 0)
	294	leds[i].default_trigger = string;
	295
	296	i++;
	297	}
	298
	299	pdata->leds = leds;
	300	pdata->num_leds = num_leds;
	301
	302	return 0;
	303	}
	304
	305	static const struct of_device_id of_ns2_leds_match[] = {
	306	{ .compatible = "lacie,ns2-leds", },
	307	{},
	308	};
	309	#endif /* CONFIG_OF_GPIO */
	310
3de1929b SG	311	struct ns2_led_priv {
	312	int num_leds;
	313	struct ns2_led_data leds_data[];
	314	};
	315
	316	static inline int sizeof_ns2_led_priv(int num_leds)
	317	{
	318	return sizeof(struct ns2_led_priv) +
	319	(sizeof(struct ns2_led_data) * num_leds);
	320	}
	321
98ea1ea2	322	static int ns2_led_probe(struct platform_device *pdev)
11efe71f SG	323	{
11efe71f SG	324	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
3de1929b	325	struct ns2_led_priv *priv;
11efe71f SG	326	int i;
	327	int ret;
	328
72052fcc SG	329	#ifdef CONFIG_OF_GPIO
	330	if (!pdata) {
	331	pdata = devm_kzalloc(&pdev->dev,
	332	sizeof(struct ns2_led_platform_data),
	333	GFP_KERNEL);
	334	if (!pdata)
	335	return -ENOMEM;
	336
	337	ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
	338	if (ret)
	339	return ret;
	340	}
	341	#else
11efe71f SG	342	if (!pdata)
11efe71f SG	343	return -EINVAL;
72052fcc	344	#endif /* CONFIG_OF_GPIO */
11efe71f	345
3de1929b SG	346	priv = devm_kzalloc(&pdev->dev,
	347	sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
	348	if (!priv)
11efe71f	349	return -ENOMEM;
3de1929b	350	priv->num_leds = pdata->num_leds;
11efe71f	351
3de1929b SG	352	for (i = 0; i < priv->num_leds; i++) {
	353	ret = create_ns2_led(pdev, &priv->leds_data[i],
	354	&pdata->leds[i]);
a209f766 BW	355	if (ret < 0) {
a209f766 BW	356	for (i = i - 1; i >= 0; i--)
3de1929b	357	delete_ns2_led(&priv->leds_data[i]);
a209f766 BW	358	return ret;
a209f766 BW	359	}
11efe71f SG	360	}
11efe71f SG	361
3de1929b	362	platform_set_drvdata(pdev, priv);
11efe71f SG	363
11efe71f SG	364	return 0;
11efe71f SG	365	}
11efe71f SG	366
678e8a6b	367	static int ns2_led_remove(struct platform_device *pdev)
11efe71f SG	368	{
11efe71f SG	369	int i;
3de1929b	370	struct ns2_led_priv *priv;
11efe71f	371
3de1929b	372	priv = platform_get_drvdata(pdev);
11efe71f	373
3de1929b SG	374	for (i = 0; i < priv->num_leds; i++)
3de1929b SG	375	delete_ns2_led(&priv->leds_data[i]);
11efe71f	376
11efe71f SG	377	platform_set_drvdata(pdev, NULL);
	378
	379	return 0;
	380	}
	381
	382	static struct platform_driver ns2_led_driver = {
	383	.probe = ns2_led_probe,
df07cf81	384	.remove = ns2_led_remove,
11efe71f	385	.driver = {
72052fcc SG	386	.name = "leds-ns2",
	387	.owner = THIS_MODULE,
	388	.of_match_table = of_match_ptr(of_ns2_leds_match),
11efe71f SG	389	},
11efe71f SG	390	};
11efe71f	391
892a8843	392	module_platform_driver(ns2_led_driver);
11efe71f SG	393
	394	MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
	395	MODULE_DESCRIPTION("Network Space v2 LED driver");
	396	MODULE_LICENSE("GPL");
892a8843	397	MODULE_ALIAS("platform:leds-ns2");