[deliverable/linux.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>

/*
 * 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 __devinit
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 = gpio_request_one(template->cmd,
			GPIOF_DIR_OUT | gpio_get_value(template->cmd),
			template->name);
	if (ret) {
		dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
			template->name);
		return ret;
	}

	ret = gpio_request_one(template->slow,
			GPIOF_DIR_OUT | gpio_get_value(template->slow),
			template->name);
	if (ret) {
		dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
			template->name);
		goto err_free_cmd;
	}

	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)
		goto err_free_slow;

	/* 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)
		goto err_free_slow;

	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);
err_free_slow:
	gpio_free(led_dat->slow);
err_free_cmd:
	gpio_free(led_dat->cmd);

	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);
	gpio_free(led_dat->cmd);
	gpio_free(led_dat->slow);
}

static int __devinit ns2_led_probe(struct platform_device *pdev)
{
	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
	struct ns2_led_data *leds_data;
	int i;
	int ret;

	if (!pdata)
		return -EINVAL;

	leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) *
			    pdata->num_leds, GFP_KERNEL);
	if (!leds_data)
		return -ENOMEM;

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

	platform_set_drvdata(pdev, leds_data);

	return 0;
}

static int __devexit ns2_led_remove(struct platform_device *pdev)
{
	int i;
	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
	struct ns2_led_data *leds_data;

	leds_data = platform_get_drvdata(pdev);

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

	platform_set_drvdata(pdev, NULL);

	return 0;
}

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

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>
11efe71f SG	33
	34	/*
	35	* The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
	36	* relation with the SATA activity. This capability is exposed through the
	37	* "sata" sysfs attribute.
	38	*
	39	* The following array detail the different LED registers and the combination
	40	* of their possible values:
	41	*
	42	* cmd_led \| slow_led \| /SATA active \| LED state
	43	* \| \| \|
	44	* 1 \| 0 \| x \| off
	45	* - \| 1 \| x \| on
	46	* 0 \| 0 \| 1 \| on
	47	* 0 \| 0 \| 0 \| blink (rate 300ms)
	48	*/
	49
	50	enum ns2_led_modes {
	51	NS_V2_LED_OFF,
	52	NS_V2_LED_ON,
	53	NS_V2_LED_SATA,
	54	};
	55
	56	struct ns2_led_mode_value {
	57	enum ns2_led_modes mode;
	58	int cmd_level;
	59	int slow_level;
	60	};
	61
	62	static struct ns2_led_mode_value ns2_led_modval[] = {
	63	{ NS_V2_LED_OFF , 1, 0 },
	64	{ NS_V2_LED_ON , 0, 1 },
	65	{ NS_V2_LED_ON , 1, 1 },
	66	{ NS_V2_LED_SATA, 0, 0 },
	67	};
	68
	69	struct ns2_led_data {
	70	struct led_classdev cdev;
	71	unsigned cmd;
	72	unsigned slow;
	73	unsigned char sata; /* True when SATA mode active. */
	74	rwlock_t rw_lock; /* Lock GPIOs. */
	75	};
	76
	77	static int ns2_led_get_mode(struct ns2_led_data *led_dat,
	78	enum ns2_led_modes *mode)
	79	{
	80	int i;
	81	int ret = -EINVAL;
	82	int cmd_level;
	83	int slow_level;
	84
f539dfed	85	read_lock_irq(&led_dat->rw_lock);
11efe71f SG	86
	87	cmd_level = gpio_get_value(led_dat->cmd);
	88	slow_level = gpio_get_value(led_dat->slow);
	89
	90	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
	91	if (cmd_level == ns2_led_modval[i].cmd_level &&
	92	slow_level == ns2_led_modval[i].slow_level) {
	93	*mode = ns2_led_modval[i].mode;
	94	ret = 0;
	95	break;
	96	}
	97	}
	98
f539dfed	99	read_unlock_irq(&led_dat->rw_lock);
11efe71f SG	100
	101	return ret;
	102	}
	103
	104	static void ns2_led_set_mode(struct ns2_led_data *led_dat,
	105	enum ns2_led_modes mode)
	106	{
	107	int i;
f539dfed	108	unsigned long flags;
11efe71f	109
f539dfed	110	write_lock_irqsave(&led_dat->rw_lock, flags);
11efe71f SG	111
	112	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
	113	if (mode == ns2_led_modval[i].mode) {
	114	gpio_set_value(led_dat->cmd,
	115	ns2_led_modval[i].cmd_level);
	116	gpio_set_value(led_dat->slow,
	117	ns2_led_modval[i].slow_level);
	118	}
	119	}
	120
f539dfed	121	write_unlock_irqrestore(&led_dat->rw_lock, flags);
11efe71f SG	122	}
	123
	124	static void ns2_led_set(struct led_classdev *led_cdev,
	125	enum led_brightness value)
	126	{
	127	struct ns2_led_data *led_dat =
	128	container_of(led_cdev, struct ns2_led_data, cdev);
	129	enum ns2_led_modes mode;
	130
	131	if (value == LED_OFF)
	132	mode = NS_V2_LED_OFF;
	133	else if (led_dat->sata)
	134	mode = NS_V2_LED_SATA;
	135	else
	136	mode = NS_V2_LED_ON;
	137
	138	ns2_led_set_mode(led_dat, mode);
	139	}
	140
	141	static ssize_t ns2_led_sata_store(struct device *dev,
	142	struct device_attribute *attr,
	143	const char *buff, size_t count)
	144	{
e5971bbc SG	145	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	146	struct ns2_led_data *led_dat =
	147	container_of(led_cdev, struct ns2_led_data, cdev);
11efe71f SG	148	int ret;
	149	unsigned long enable;
	150	enum ns2_led_modes mode;
11efe71f	151
3874350c	152	ret = kstrtoul(buff, 10, &enable);
11efe71f SG	153	if (ret < 0)
	154	return ret;
	155
	156	enable = !!enable;
	157
	158	if (led_dat->sata == enable)
	159	return count;
	160
	161	ret = ns2_led_get_mode(led_dat, &mode);
	162	if (ret < 0)
	163	return ret;
	164
	165	if (enable && mode == NS_V2_LED_ON)
	166	ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
	167	if (!enable && mode == NS_V2_LED_SATA)
	168	ns2_led_set_mode(led_dat, NS_V2_LED_ON);
	169
	170	led_dat->sata = enable;
	171
	172	return count;
	173	}
	174
	175	static ssize_t ns2_led_sata_show(struct device *dev,
	176	struct device_attribute attr, char buf)
	177	{
e5971bbc SG	178	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	179	struct ns2_led_data *led_dat =
	180	container_of(led_cdev, struct ns2_led_data, cdev);
11efe71f SG	181
	182	return sprintf(buf, "%d\n", led_dat->sata);
	183	}
	184
	185	static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
	186
	187	static int __devinit
	188	create_ns2_led(struct platform_device pdev, struct ns2_led_data led_dat,
	189	const struct ns2_led *template)
	190	{
	191	int ret;
	192	enum ns2_led_modes mode;
	193
31c3dc74 JH	194	ret = gpio_request_one(template->cmd,
	195	GPIOF_DIR_OUT \| gpio_get_value(template->cmd),
	196	template->name);
11efe71f SG	197	if (ret) {
	198	dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
	199	template->name);
31c3dc74	200	return ret;
11efe71f SG	201	}
11efe71f SG	202
31c3dc74 JH	203	ret = gpio_request_one(template->slow,
	204	GPIOF_DIR_OUT \| gpio_get_value(template->slow),
	205	template->name);
11efe71f SG	206	if (ret) {
	207	dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
	208	template->name);
	209	goto err_free_cmd;
	210	}
	211
	212	rwlock_init(&led_dat->rw_lock);
	213
	214	led_dat->cdev.name = template->name;
	215	led_dat->cdev.default_trigger = template->default_trigger;
	216	led_dat->cdev.blink_set = NULL;
	217	led_dat->cdev.brightness_set = ns2_led_set;
	218	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
	219	led_dat->cmd = template->cmd;
	220	led_dat->slow = template->slow;
	221
	222	ret = ns2_led_get_mode(led_dat, &mode);
	223	if (ret < 0)
	224	goto err_free_slow;
	225
	226	/* Set LED initial state. */
	227	led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
	228	led_dat->cdev.brightness =
	229	(mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
	230
	231	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
	232	if (ret < 0)
	233	goto err_free_slow;
	234
11efe71f SG	235	ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
	236	if (ret < 0)
	237	goto err_free_cdev;
	238
	239	return 0;
	240
	241	err_free_cdev:
	242	led_classdev_unregister(&led_dat->cdev);
	243	err_free_slow:
	244	gpio_free(led_dat->slow);
	245	err_free_cmd:
	246	gpio_free(led_dat->cmd);
	247
	248	return ret;
	249	}
	250
b8cd742a	251	static void delete_ns2_led(struct ns2_led_data *led_dat)
11efe71f SG	252	{
	253	device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
	254	led_classdev_unregister(&led_dat->cdev);
	255	gpio_free(led_dat->cmd);
	256	gpio_free(led_dat->slow);
	257	}
	258
	259	static int __devinit ns2_led_probe(struct platform_device *pdev)
	260	{
	261	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
	262	struct ns2_led_data *leds_data;
	263	int i;
	264	int ret;
	265
	266	if (!pdata)
	267	return -EINVAL;
	268
a209f766	269	leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) *
11efe71f SG	270	pdata->num_leds, GFP_KERNEL);
	271	if (!leds_data)
	272	return -ENOMEM;
	273
	274	for (i = 0; i < pdata->num_leds; i++) {
	275	ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
a209f766 BW	276	if (ret < 0) {
	277	for (i = i - 1; i >= 0; i--)
	278	delete_ns2_led(&leds_data[i]);
	279	return ret;
	280	}
11efe71f SG	281	}
	282
	283	platform_set_drvdata(pdev, leds_data);
	284
	285	return 0;
11efe71f SG	286	}
	287
	288	static int __devexit ns2_led_remove(struct platform_device *pdev)
	289	{
	290	int i;
	291	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
	292	struct ns2_led_data *leds_data;
	293
	294	leds_data = platform_get_drvdata(pdev);
	295
	296	for (i = 0; i < pdata->num_leds; i++)
	297	delete_ns2_led(&leds_data[i]);
	298
11efe71f SG	299	platform_set_drvdata(pdev, NULL);
	300
	301	return 0;
	302	}
	303
	304	static struct platform_driver ns2_led_driver = {
	305	.probe = ns2_led_probe,
	306	.remove = __devexit_p(ns2_led_remove),
	307	.driver = {
	308	.name = "leds-ns2",
	309	.owner = THIS_MODULE,
	310	},
	311	};
11efe71f	312
892a8843	313	module_platform_driver(ns2_led_driver);
11efe71f SG	314
	315	MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
	316	MODULE_DESCRIPTION("Network Space v2 LED driver");
	317	MODULE_LICENSE("GPL");
892a8843	318	MODULE_ALIAS("platform:leds-ns2");