[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/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 = strict_strtoul(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 = gpio_request(template->cmd, template->name);
	if (ret == 0) {
		ret = gpio_direction_output(template->cmd,
					    gpio_get_value(template->cmd));
		if (ret)
			gpio_free(template->cmd);
	}
	if (ret) {
		dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
			template->name);
	}

	ret = gpio_request(template->slow, template->name);
	if (ret == 0) {
		ret = gpio_direction_output(template->slow,
					    gpio_get_value(template->slow));
		if (ret)
			gpio_free(template->slow);
	}
	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 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 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		= 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 SG	151
	152	ret = strict_strtoul(buff, 10, &enable);
	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
98ea1ea2	187	static int
11efe71f SG	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
	194	ret = gpio_request(template->cmd, template->name);
	195	if (ret == 0) {
	196	ret = gpio_direction_output(template->cmd,
	197	gpio_get_value(template->cmd));
	198	if (ret)
	199	gpio_free(template->cmd);
	200	}
	201	if (ret) {
	202	dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
	203	template->name);
	204	}
	205
	206	ret = gpio_request(template->slow, template->name);
	207	if (ret == 0) {
	208	ret = gpio_direction_output(template->slow,
	209	gpio_get_value(template->slow));
	210	if (ret)
	211	gpio_free(template->slow);
	212	}
	213	if (ret) {
	214	dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
	215	template->name);
	216	goto err_free_cmd;
	217	}
	218
	219	rwlock_init(&led_dat->rw_lock);
	220
	221	led_dat->cdev.name = template->name;
	222	led_dat->cdev.default_trigger = template->default_trigger;
	223	led_dat->cdev.blink_set = NULL;
	224	led_dat->cdev.brightness_set = ns2_led_set;
	225	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
	226	led_dat->cmd = template->cmd;
	227	led_dat->slow = template->slow;
	228
	229	ret = ns2_led_get_mode(led_dat, &mode);
	230	if (ret < 0)
	231	goto err_free_slow;
	232
	233	/* Set LED initial state. */
	234	led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
	235	led_dat->cdev.brightness =
	236	(mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
	237
	238	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
	239	if (ret < 0)
	240	goto err_free_slow;
	241
11efe71f SG	242	ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
	243	if (ret < 0)
	244	goto err_free_cdev;
	245
	246	return 0;
	247
	248	err_free_cdev:
	249	led_classdev_unregister(&led_dat->cdev);
	250	err_free_slow:
	251	gpio_free(led_dat->slow);
	252	err_free_cmd:
	253	gpio_free(led_dat->cmd);
	254
	255	return ret;
	256	}
	257
b8cd742a	258	static void delete_ns2_led(struct ns2_led_data *led_dat)
11efe71f SG	259	{
	260	device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
	261	led_classdev_unregister(&led_dat->cdev);
	262	gpio_free(led_dat->cmd);
	263	gpio_free(led_dat->slow);
	264	}
	265
98ea1ea2	266	static int ns2_led_probe(struct platform_device *pdev)
11efe71f SG	267	{
	268	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
	269	struct ns2_led_data *leds_data;
	270	int i;
	271	int ret;
	272
	273	if (!pdata)
	274	return -EINVAL;
	275
a209f766	276	leds_data = devm_kzalloc(&pdev->dev, sizeof(struct ns2_led_data) *
11efe71f SG	277	pdata->num_leds, GFP_KERNEL);
	278	if (!leds_data)
	279	return -ENOMEM;
	280
	281	for (i = 0; i < pdata->num_leds; i++) {
	282	ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
a209f766 BW	283	if (ret < 0) {
	284	for (i = i - 1; i >= 0; i--)
	285	delete_ns2_led(&leds_data[i]);
	286	return ret;
	287	}
11efe71f SG	288	}
	289
	290	platform_set_drvdata(pdev, leds_data);
	291
	292	return 0;
11efe71f SG	293	}
11efe71f SG	294
678e8a6b	295	static int ns2_led_remove(struct platform_device *pdev)
11efe71f SG	296	{
	297	int i;
	298	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
	299	struct ns2_led_data *leds_data;
	300
	301	leds_data = platform_get_drvdata(pdev);
	302
	303	for (i = 0; i < pdata->num_leds; i++)
	304	delete_ns2_led(&leds_data[i]);
	305
11efe71f SG	306	platform_set_drvdata(pdev, NULL);
	307
	308	return 0;
	309	}
	310
	311	static struct platform_driver ns2_led_driver = {
	312	.probe = ns2_led_probe,
df07cf81	313	.remove = ns2_led_remove,
11efe71f SG	314	.driver = {
	315	.name = "leds-ns2",
	316	.owner = THIS_MODULE,
	317	},
	318	};
11efe71f	319
892a8843	320	module_platform_driver(ns2_led_driver);
11efe71f SG	321
	322	MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
	323	MODULE_DESCRIPTION("Network Space v2 LED driver");
	324	MODULE_LICENSE("GPL");
892a8843	325	MODULE_ALIAS("platform:leds-ns2");