[linux-2.6-block.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/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.h>
#include <linux/of_gpio.h>
#include "leds.h"

/*
 * The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED
 * modes are available: off, on and SATA activity blinking. The LED modes are
 * controlled through two GPIOs (command and slow): each combination of values
 * for the command/slow GPIOs corresponds to a LED mode.
 */

struct ns2_led_data {
	struct led_classdev	cdev;
	unsigned		cmd;
	unsigned		slow;
	bool			can_sleep;
	int			mode_index;
	unsigned char		sata; /* True when SATA mode active. */
	rwlock_t		rw_lock; /* Lock GPIOs. */
	struct work_struct	work;
	int			num_modes;
	struct ns2_led_modval	*modval;
};

static void ns2_led_work(struct work_struct *work)
{
	struct ns2_led_data *led_dat =
		container_of(work, struct ns2_led_data, work);
	int i = led_dat->mode_index;

	gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
	gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
}

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;

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

	for (i = 0; i < led_dat->num_modes; i++) {
		if (cmd_level == led_dat->modval[i].cmd_level &&
		    slow_level == led_dat->modval[i].slow_level) {
			*mode = led_dat->modval[i].mode;
			ret = 0;
			break;
		}
	}

	return ret;
}

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

	for (i = 0; i < led_dat->num_modes; i++)
		if (mode == led_dat->modval[i].mode) {
			found = true;
			break;
		}

	if (!found)
		return;

	write_lock_irqsave(&led_dat->rw_lock, flags);

	if (!led_dat->can_sleep) {
		gpio_set_value(led_dat->cmd,
			       led_dat->modval[i].cmd_level);
		gpio_set_value(led_dat->slow,
			       led_dat->modval[i].slow_level);
		goto exit_unlock;
	}

	led_dat->mode_index = i;
	schedule_work(&led_dat->work);

exit_unlock:
	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;

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

	enable = !!enable;

	if (led_dat->sata == enable)
		goto exit;

	led_dat->sata = enable;

	if (!led_get_brightness(led_cdev))
		goto exit;

	if (enable)
		ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
	else
		ns2_led_set_mode(led_dat, NS_V2_LED_ON);

exit:
	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 struct attribute *ns2_led_attrs[] = {
	&dev_attr_sata.attr,
	NULL
};
ATTRIBUTE_GROUPS(ns2_led);

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_cansleep(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_cansleep(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->cdev.groups = ns2_led_groups;
	led_dat->cmd = template->cmd;
	led_dat->slow = template->slow;
	led_dat->can_sleep = gpio_cansleep(led_dat->cmd) |
				gpio_cansleep(led_dat->slow);
	led_dat->modval = template->modval;
	led_dat->num_modes = template->num_modes;

	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;

	INIT_WORK(&led_dat->work, ns2_led_work);

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

	return 0;
}

static void delete_ns2_led(struct ns2_led_data *led_dat)
{
	led_classdev_unregister(&led_dat->cdev);
	cancel_work_sync(&led_dat->work);
}

#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 *led, *leds;
	int num_leds = 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;

	led = leds;
	for_each_child_of_node(np, child) {
		const char *string;
		int ret, i, num_modes;
		struct ns2_led_modval *modval;

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

		ret = of_property_count_u32_elems(child, "modes-map");
		if (ret < 0 || ret % 3) {
			dev_err(dev,
				"Missing or malformed modes-map property\n");
			return -EINVAL;
		}

		num_modes = ret / 3;
		modval = devm_kzalloc(dev,
				      num_modes * sizeof(struct ns2_led_modval),
				      GFP_KERNEL);
		if (!modval)
			return -ENOMEM;

		for (i = 0; i < num_modes; i++) {
			of_property_read_u32_index(child,
						"modes-map", 3 * i,
						(u32 *) &modval[i].mode);
			of_property_read_u32_index(child,
						"modes-map", 3 * i + 1,
						(u32 *) &modval[i].cmd_level);
			of_property_read_u32_index(child,
						"modes-map", 3 * i + 2,
						(u32 *) &modval[i].slow_level);
		}

		led->num_modes = num_modes;
		led->modval = modval;

		led++;
	}

	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 = dev_get_platdata(&pdev->dev);
	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]);

	return 0;
}

static struct platform_driver ns2_led_driver = {
	.probe		= ns2_led_probe,
	.remove		= ns2_led_remove,
	.driver		= {
		.name		= "leds-ns2",
		.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>
11efe71f SG	26	#include <linux/platform_device.h>
	27	#include <linux/slab.h>
	28	#include <linux/gpio.h>
	29	#include <linux/leds.h>
54f4dedb	30	#include <linux/module.h>
c02cecb9	31	#include <linux/platform_data/leds-kirkwood-ns2.h>
c68f46dd	32	#include <linux/of.h>
72052fcc	33	#include <linux/of_gpio.h>
4b90432d	34	#include "leds.h"
11efe71f SG	35
11efe71f SG	36	/*
f7fafd08 VD	37	* The Network Space v2 dual-GPIO LED is wired to a CPLD. Three different LED
	38	* modes are available: off, on and SATA activity blinking. The LED modes are
	39	* controlled through two GPIOs (command and slow): each combination of values
	40	* for the command/slow GPIOs corresponds to a LED mode.
11efe71f SG	41	*/
11efe71f SG	42
11efe71f SG	43	struct ns2_led_data {
	44	struct led_classdev cdev;
	45	unsigned cmd;
	46	unsigned slow;
4b90432d SG	47	bool can_sleep;
4b90432d SG	48	int mode_index;
11efe71f SG	49	unsigned char sata; /* True when SATA mode active. */
11efe71f SG	50	rwlock_t rw_lock; /* Lock GPIOs. */
4b90432d	51	struct work_struct work;
f7fafd08 VD	52	int num_modes;
f7fafd08 VD	53	struct ns2_led_modval *modval;
11efe71f SG	54	};
11efe71f SG	55
4b90432d SG	56	static void ns2_led_work(struct work_struct *work)
	57	{
	58	struct ns2_led_data *led_dat =
	59	container_of(work, struct ns2_led_data, work);
	60	int i = led_dat->mode_index;
	61
	62	gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
	63	gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
	64	}
	65
11efe71f SG	66	static int ns2_led_get_mode(struct ns2_led_data *led_dat,
	67	enum ns2_led_modes *mode)
	68	{
	69	int i;
	70	int ret = -EINVAL;
	71	int cmd_level;
	72	int slow_level;
	73
4b90432d SG	74	cmd_level = gpio_get_value_cansleep(led_dat->cmd);
4b90432d SG	75	slow_level = gpio_get_value_cansleep(led_dat->slow);
11efe71f	76
f7fafd08 VD	77	for (i = 0; i < led_dat->num_modes; i++) {
	78	if (cmd_level == led_dat->modval[i].cmd_level &&
	79	slow_level == led_dat->modval[i].slow_level) {
	80	*mode = led_dat->modval[i].mode;
11efe71f SG	81	ret = 0;
	82	break;
	83	}
	84	}
	85
11efe71f SG	86	return ret;
	87	}
	88
	89	static void ns2_led_set_mode(struct ns2_led_data *led_dat,
	90	enum ns2_led_modes mode)
	91	{
	92	int i;
4b90432d	93	bool found = false;
f539dfed	94	unsigned long flags;
11efe71f	95
4b90432d	96	for (i = 0; i < led_dat->num_modes; i++)
f7fafd08	97	if (mode == led_dat->modval[i].mode) {
4b90432d SG	98	found = true;
4b90432d SG	99	break;
11efe71f	100	}
4b90432d SG	101
	102	if (!found)
	103	return;
	104
	105	write_lock_irqsave(&led_dat->rw_lock, flags);
	106
	107	if (!led_dat->can_sleep) {
	108	gpio_set_value(led_dat->cmd,
	109	led_dat->modval[i].cmd_level);
	110	gpio_set_value(led_dat->slow,
	111	led_dat->modval[i].slow_level);
	112	goto exit_unlock;
11efe71f SG	113	}
11efe71f SG	114
4b90432d SG	115	led_dat->mode_index = i;
	116	schedule_work(&led_dat->work);
	117
	118	exit_unlock:
f539dfed	119	write_unlock_irqrestore(&led_dat->rw_lock, flags);
11efe71f SG	120	}
	121
	122	static void ns2_led_set(struct led_classdev *led_cdev,
	123	enum led_brightness value)
	124	{
	125	struct ns2_led_data *led_dat =
	126	container_of(led_cdev, struct ns2_led_data, cdev);
	127	enum ns2_led_modes mode;
	128
	129	if (value == LED_OFF)
	130	mode = NS_V2_LED_OFF;
	131	else if (led_dat->sata)
	132	mode = NS_V2_LED_SATA;
	133	else
	134	mode = NS_V2_LED_ON;
	135
	136	ns2_led_set_mode(led_dat, mode);
	137	}
	138
	139	static ssize_t ns2_led_sata_store(struct device *dev,
	140	struct device_attribute *attr,
	141	const char *buff, size_t count)
	142	{
e5971bbc SG	143	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	144	struct ns2_led_data *led_dat =
	145	container_of(led_cdev, struct ns2_led_data, cdev);
11efe71f SG	146	int ret;
11efe71f SG	147	unsigned long enable;
11efe71f	148
3874350c	149	ret = kstrtoul(buff, 10, &enable);
11efe71f SG	150	if (ret < 0)
	151	return ret;
	152
	153	enable = !!enable;
	154
	155	if (led_dat->sata == enable)
4b90432d	156	goto exit;
11efe71f	157
4b90432d SG	158	led_dat->sata = enable;
	159
	160	if (!led_get_brightness(led_cdev))
	161	goto exit;
11efe71f	162
4b90432d	163	if (enable)
11efe71f	164	ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
4b90432d	165	else
11efe71f SG	166	ns2_led_set_mode(led_dat, NS_V2_LED_ON);
11efe71f SG	167
4b90432d	168	exit:
11efe71f SG	169	return count;
	170	}
	171
	172	static ssize_t ns2_led_sata_show(struct device *dev,
	173	struct device_attribute attr, char buf)
	174	{
e5971bbc SG	175	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	176	struct ns2_led_data *led_dat =
	177	container_of(led_cdev, struct ns2_led_data, cdev);
11efe71f SG	178
	179	return sprintf(buf, "%d\n", led_dat->sata);
	180	}
	181
	182	static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
	183
475f8548 JH	184	static struct attribute *ns2_led_attrs[] = {
	185	&dev_attr_sata.attr,
	186	NULL
	187	};
	188	ATTRIBUTE_GROUPS(ns2_led);
	189
98ea1ea2	190	static int
11efe71f SG	191	create_ns2_led(struct platform_device pdev, struct ns2_led_data led_dat,
	192	const struct ns2_led *template)
	193	{
	194	int ret;
	195	enum ns2_led_modes mode;
	196
04195823	197	ret = devm_gpio_request_one(&pdev->dev, template->cmd,
4b90432d	198	gpio_get_value_cansleep(template->cmd) ?
9d04cbaa	199	GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
31c3dc74	200	template->name);
11efe71f SG	201	if (ret) {
	202	dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
	203	template->name);
31c3dc74	204	return ret;
11efe71f SG	205	}
11efe71f SG	206
04195823	207	ret = devm_gpio_request_one(&pdev->dev, template->slow,
4b90432d	208	gpio_get_value_cansleep(template->slow) ?
9d04cbaa	209	GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
31c3dc74	210	template->name);
11efe71f SG	211	if (ret) {
	212	dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
	213	template->name);
04195823	214	return ret;
11efe71f SG	215	}
	216
	217	rwlock_init(&led_dat->rw_lock);
	218
	219	led_dat->cdev.name = template->name;
	220	led_dat->cdev.default_trigger = template->default_trigger;
	221	led_dat->cdev.blink_set = NULL;
	222	led_dat->cdev.brightness_set = ns2_led_set;
	223	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
475f8548	224	led_dat->cdev.groups = ns2_led_groups;
11efe71f SG	225	led_dat->cmd = template->cmd;
11efe71f SG	226	led_dat->slow = template->slow;
4b90432d SG	227	led_dat->can_sleep = gpio_cansleep(led_dat->cmd) \|
4b90432d SG	228	gpio_cansleep(led_dat->slow);
f7fafd08 VD	229	led_dat->modval = template->modval;
f7fafd08 VD	230	led_dat->num_modes = template->num_modes;
11efe71f SG	231
	232	ret = ns2_led_get_mode(led_dat, &mode);
	233	if (ret < 0)
04195823	234	return ret;
11efe71f SG	235
	236	/* Set LED initial state. */
	237	led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
	238	led_dat->cdev.brightness =
	239	(mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
	240
4b90432d SG	241	INIT_WORK(&led_dat->work, ns2_led_work);
4b90432d SG	242
11efe71f SG	243	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
11efe71f SG	244	if (ret < 0)
04195823	245	return ret;
11efe71f	246
11efe71f	247	return 0;
11efe71f SG	248	}
11efe71f SG	249
b8cd742a	250	static void delete_ns2_led(struct ns2_led_data *led_dat)
11efe71f	251	{
11efe71f	252	led_classdev_unregister(&led_dat->cdev);
4b90432d	253	cancel_work_sync(&led_dat->work);
11efe71f SG	254	}
11efe71f SG	255
72052fcc SG	256	#ifdef CONFIG_OF_GPIO
	257	/*
	258	* Translate OpenFirmware node properties into platform_data.
	259	*/
cf4af012	260	static int
72052fcc SG	261	ns2_leds_get_of_pdata(struct device dev, struct ns2_led_platform_data pdata)
	262	{
	263	struct device_node *np = dev->of_node;
	264	struct device_node *child;
f7fafd08	265	struct ns2_led led, leds;
72052fcc	266	int num_leds = 0;
72052fcc SG	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
f7fafd08	277	led = leds;
72052fcc SG	278	for_each_child_of_node(np, child) {
72052fcc SG	279	const char *string;
f7fafd08 VD	280	int ret, i, num_modes;
f7fafd08 VD	281	struct ns2_led_modval *modval;
72052fcc SG	282
	283	ret = of_get_named_gpio(child, "cmd-gpio", 0);
	284	if (ret < 0)
	285	return ret;
f7fafd08	286	led->cmd = ret;
72052fcc SG	287	ret = of_get_named_gpio(child, "slow-gpio", 0);
	288	if (ret < 0)
	289	return ret;
f7fafd08	290	led->slow = ret;
72052fcc	291	ret = of_property_read_string(child, "label", &string);
f7fafd08	292	led->name = (ret == 0) ? string : child->name;
72052fcc SG	293	ret = of_property_read_string(child, "linux,default-trigger",
	294	&string);
	295	if (ret == 0)
f7fafd08 VD	296	led->default_trigger = string;
	297
	298	ret = of_property_count_u32_elems(child, "modes-map");
	299	if (ret < 0 \|\| ret % 3) {
	300	dev_err(dev,
	301	"Missing or malformed modes-map property\n");
	302	return -EINVAL;
	303	}
	304
	305	num_modes = ret / 3;
	306	modval = devm_kzalloc(dev,
	307	num_modes * sizeof(struct ns2_led_modval),
	308	GFP_KERNEL);
	309	if (!modval)
	310	return -ENOMEM;
	311
	312	for (i = 0; i < num_modes; i++) {
	313	of_property_read_u32_index(child,
	314	"modes-map", 3 * i,
	315	(u32 *) &modval[i].mode);
	316	of_property_read_u32_index(child,
	317	"modes-map", 3 * i + 1,
	318	(u32 *) &modval[i].cmd_level);
	319	of_property_read_u32_index(child,
	320	"modes-map", 3 * i + 2,
	321	(u32 *) &modval[i].slow_level);
	322	}
	323
	324	led->num_modes = num_modes;
	325	led->modval = modval;
72052fcc	326
f7fafd08	327	led++;
72052fcc SG	328	}
	329
	330	pdata->leds = leds;
	331	pdata->num_leds = num_leds;
	332
	333	return 0;
	334	}
	335
	336	static const struct of_device_id of_ns2_leds_match[] = {
	337	{ .compatible = "lacie,ns2-leds", },
	338	{},
	339	};
	340	#endif /* CONFIG_OF_GPIO */
	341
3de1929b SG	342	struct ns2_led_priv {
	343	int num_leds;
	344	struct ns2_led_data leds_data[];
	345	};
	346
	347	static inline int sizeof_ns2_led_priv(int num_leds)
	348	{
	349	return sizeof(struct ns2_led_priv) +
	350	(sizeof(struct ns2_led_data) * num_leds);
	351	}
	352
98ea1ea2	353	static int ns2_led_probe(struct platform_device *pdev)
11efe71f	354	{
87aae1ea	355	struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
3de1929b	356	struct ns2_led_priv *priv;
11efe71f SG	357	int i;
	358	int ret;
	359
72052fcc SG	360	#ifdef CONFIG_OF_GPIO
	361	if (!pdata) {
	362	pdata = devm_kzalloc(&pdev->dev,
	363	sizeof(struct ns2_led_platform_data),
	364	GFP_KERNEL);
	365	if (!pdata)
	366	return -ENOMEM;
	367
	368	ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
	369	if (ret)
	370	return ret;
	371	}
	372	#else
11efe71f SG	373	if (!pdata)
11efe71f SG	374	return -EINVAL;
72052fcc	375	#endif /* CONFIG_OF_GPIO */
11efe71f	376
3de1929b SG	377	priv = devm_kzalloc(&pdev->dev,
	378	sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
	379	if (!priv)
11efe71f	380	return -ENOMEM;
3de1929b	381	priv->num_leds = pdata->num_leds;
11efe71f	382
3de1929b SG	383	for (i = 0; i < priv->num_leds; i++) {
	384	ret = create_ns2_led(pdev, &priv->leds_data[i],
	385	&pdata->leds[i]);
a209f766 BW	386	if (ret < 0) {
a209f766 BW	387	for (i = i - 1; i >= 0; i--)
3de1929b	388	delete_ns2_led(&priv->leds_data[i]);
a209f766 BW	389	return ret;
a209f766 BW	390	}
11efe71f SG	391	}
11efe71f SG	392
3de1929b	393	platform_set_drvdata(pdev, priv);
11efe71f SG	394
11efe71f SG	395	return 0;
11efe71f SG	396	}
11efe71f SG	397
678e8a6b	398	static int ns2_led_remove(struct platform_device *pdev)
11efe71f SG	399	{
11efe71f SG	400	int i;
3de1929b	401	struct ns2_led_priv *priv;
11efe71f	402
3de1929b	403	priv = platform_get_drvdata(pdev);
11efe71f	404
3de1929b SG	405	for (i = 0; i < priv->num_leds; i++)
3de1929b SG	406	delete_ns2_led(&priv->leds_data[i]);
11efe71f	407
11efe71f SG	408	return 0;
	409	}
	410
	411	static struct platform_driver ns2_led_driver = {
	412	.probe = ns2_led_probe,
df07cf81	413	.remove = ns2_led_remove,
11efe71f	414	.driver = {
72052fcc	415	.name = "leds-ns2",
72052fcc	416	.of_match_table = of_match_ptr(of_ns2_leds_match),
11efe71f SG	417	},
11efe71f SG	418	};
11efe71f	419
892a8843	420	module_platform_driver(ns2_led_driver);
11efe71f SG	421
	422	MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
	423	MODULE_DESCRIPTION("Network Space v2 LED driver");
	424	MODULE_LICENSE("GPL");
892a8843	425	MODULE_ALIAS("platform:leds-ns2");