[net-next-2.6.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 <mach/leds-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)
{
	int ret;
	unsigned long enable;
	enum ns2_led_modes mode;
	struct ns2_led_data *led_dat = dev_get_drvdata(dev);

	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 ns2_led_data *led_dat = dev_get_drvdata(dev);

	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(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;

	dev_set_drvdata(led_dat->cdev.dev, led_dat);
	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 __devexit 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 = kzalloc(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)
			goto err;

	}

	platform_set_drvdata(pdev, leds_data);

	return 0;

err:
	for (i = i - 1; i >= 0; i--)
		delete_ns2_led(&leds_data[i]);

	kfree(leds_data);

	return ret;
}

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]);

	kfree(leds_data);
	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_ALIAS("platform:leds-ns2");

static int __init ns2_led_init(void)
{
	return platform_driver_register(&ns2_led_driver);
}

static void __exit ns2_led_exit(void)
{
	platform_driver_unregister(&ns2_led_driver);
}

module_init(ns2_led_init);
module_exit(ns2_led_exit);

MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
MODULE_DESCRIPTION("Network Space v2 LED driver");
MODULE_LICENSE("GPL");
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>
	31	#include <mach/leds-ns2.h>
	32
	33	/*
	34	* The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
	35	* relation with the SATA activity. This capability is exposed through the
	36	* "sata" sysfs attribute.
	37	*
	38	* The following array detail the different LED registers and the combination
	39	* of their possible values:
	40	*
	41	* cmd_led \| slow_led \| /SATA active \| LED state
	42	* \| \| \|
	43	* 1 \| 0 \| x \| off
	44	* - \| 1 \| x \| on
	45	* 0 \| 0 \| 1 \| on
	46	* 0 \| 0 \| 0 \| blink (rate 300ms)
	47	*/
	48
	49	enum ns2_led_modes {
	50	NS_V2_LED_OFF,
	51	NS_V2_LED_ON,
	52	NS_V2_LED_SATA,
	53	};
	54
	55	struct ns2_led_mode_value {
	56	enum ns2_led_modes mode;
	57	int cmd_level;
	58	int slow_level;
	59	};
	60
	61	static struct ns2_led_mode_value ns2_led_modval[] = {
	62	{ NS_V2_LED_OFF , 1, 0 },
	63	{ NS_V2_LED_ON , 0, 1 },
	64	{ NS_V2_LED_ON , 1, 1 },
65	{ NS_V2_LED_SATA, 0, 0 },
66	};
67
68	struct ns2_led_data {
69	struct led_classdev cdev;
70	unsigned cmd;
71	unsigned slow;
72	unsigned char sata; /* True when SATA mode active. */
73	rwlock_t rw_lock; /* Lock GPIOs. */
74	};
75
76	static int ns2_led_get_mode(struct ns2_led_data *led_dat,
77	enum ns2_led_modes *mode)
78	{
79	int i;
80	int ret = -EINVAL;
81	int cmd_level;
82	int slow_level;
83
f539dfed	84	read_lock_irq(&led_dat->rw_lock);
11efe71f SG	85
	86	cmd_level = gpio_get_value(led_dat->cmd);
	87	slow_level = gpio_get_value(led_dat->slow);
	88
	89	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
	90	if (cmd_level == ns2_led_modval[i].cmd_level &&
	91	slow_level == ns2_led_modval[i].slow_level) {
	92	*mode = ns2_led_modval[i].mode;
	93	ret = 0;
	94	break;
	95	}
	96	}
	97
f539dfed	98	read_unlock_irq(&led_dat->rw_lock);
11efe71f SG	99
	100	return ret;
	101	}
	102
	103	static void ns2_led_set_mode(struct ns2_led_data *led_dat,
	104	enum ns2_led_modes mode)
	105	{
	106	int i;
f539dfed	107	unsigned long flags;
11efe71f	108
f539dfed	109	write_lock_irqsave(&led_dat->rw_lock, flags);
11efe71f SG	110
	111	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
	112	if (mode == ns2_led_modval[i].mode) {
	113	gpio_set_value(led_dat->cmd,
	114	ns2_led_modval[i].cmd_level);
	115	gpio_set_value(led_dat->slow,
	116	ns2_led_modval[i].slow_level);
	117	}
	118	}
	119
f539dfed	120	write_unlock_irqrestore(&led_dat->rw_lock, flags);
11efe71f SG	121	}
	122
	123	static void ns2_led_set(struct led_classdev *led_cdev,
	124	enum led_brightness value)
	125	{
	126	struct ns2_led_data *led_dat =
	127	container_of(led_cdev, struct ns2_led_data, cdev);
	128	enum ns2_led_modes mode;
	129
	130	if (value == LED_OFF)
	131	mode = NS_V2_LED_OFF;
	132	else if (led_dat->sata)
	133	mode = NS_V2_LED_SATA;
	134	else
	135	mode = NS_V2_LED_ON;
	136
	137	ns2_led_set_mode(led_dat, mode);
	138	}
	139
	140	static ssize_t ns2_led_sata_store(struct device *dev,
	141	struct device_attribute *attr,
	142	const char *buff, size_t count)
	143	{
	144	int ret;
	145	unsigned long enable;
	146	enum ns2_led_modes mode;
	147	struct ns2_led_data *led_dat = dev_get_drvdata(dev);
	148
	149	ret = strict_strtoul(buff, 10, &enable);
	150	if (ret < 0)
	151	return ret;
	152
	153	enable = !!enable;
	154
	155	if (led_dat->sata == enable)
	156	return count;
	157
	158	ret = ns2_led_get_mode(led_dat, &mode);
	159	if (ret < 0)
	160	return ret;
	161
	162	if (enable && mode == NS_V2_LED_ON)
	163	ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
	164	if (!enable && mode == NS_V2_LED_SATA)
	165	ns2_led_set_mode(led_dat, NS_V2_LED_ON);
	166
	167	led_dat->sata = enable;
	168
	169	return count;
	170	}
	171
	172	static ssize_t ns2_led_sata_show(struct device *dev,
	173	struct device_attribute attr, char buf)
	174	{
	175	struct ns2_led_data *led_dat = dev_get_drvdata(dev);
	176
	177	return sprintf(buf, "%d\n", led_dat->sata);
	178	}
	179
	180	static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
	181
	182	static int __devinit
	183	create_ns2_led(struct platform_device pdev, struct ns2_led_data led_dat,
	184	const struct ns2_led *template)
185	{
186	int ret;
187	enum ns2_led_modes mode;
188
189	ret = gpio_request(template->cmd, template->name);
190	if (ret == 0) {
191	ret = gpio_direction_output(template->cmd,
192	gpio_get_value(template->cmd));
193	if (ret)
194	gpio_free(template->cmd);
195	}
196	if (ret) {
197	dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
198	template->name);
199	}
200
201	ret = gpio_request(template->slow, template->name);
202	if (ret == 0) {
203	ret = gpio_direction_output(template->slow,
204	gpio_get_value(template->slow));
205	if (ret)
206	gpio_free(template->slow);
207	}
208	if (ret) {
209	dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
210	template->name);
211	goto err_free_cmd;
212	}
213
214	rwlock_init(&led_dat->rw_lock);
215
216	led_dat->cdev.name = template->name;
217	led_dat->cdev.default_trigger = template->default_trigger;
218	led_dat->cdev.blink_set = NULL;
219	led_dat->cdev.brightness_set = ns2_led_set;
220	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
221	led_dat->cmd = template->cmd;
222	led_dat->slow = template->slow;
223
224	ret = ns2_led_get_mode(led_dat, &mode);
225	if (ret < 0)
226	goto err_free_slow;
227
228	/* Set LED initial state. */
229	led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
230	led_dat->cdev.brightness =
231	(mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
232
233	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
234	if (ret < 0)
235	goto err_free_slow;
236
237	dev_set_drvdata(led_dat->cdev.dev, led_dat);
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);
246	err_free_slow:
247	gpio_free(led_dat->slow);
248	err_free_cmd:
249	gpio_free(led_dat->cmd);
250
251	return ret;
252	}
253
254	static void __devexit delete_ns2_led(struct ns2_led_data *led_dat)
255	{
256	device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
257	led_classdev_unregister(&led_dat->cdev);
258	gpio_free(led_dat->cmd);
259	gpio_free(led_dat->slow);
260	}
261
262	static int __devinit ns2_led_probe(struct platform_device *pdev)
263	{
264	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
265	struct ns2_led_data *leds_data;
266	int i;
267	int ret;
268
269	if (!pdata)
270	return -EINVAL;
271
272	leds_data = kzalloc(sizeof(struct ns2_led_data) *
273	pdata->num_leds, GFP_KERNEL);
274	if (!leds_data)
275	return -ENOMEM;
276
277	for (i = 0; i < pdata->num_leds; i++) {
278	ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
279	if (ret < 0)
280	goto err;
281
282	}
283
284	platform_set_drvdata(pdev, leds_data);
285
286	return 0;
287
288	err:
289	for (i = i - 1; i >= 0; i--)
290	delete_ns2_led(&leds_data[i]);
291
292	kfree(leds_data);
293
294	return ret;
295	}
296
297	static int __devexit ns2_led_remove(struct platform_device *pdev)
298	{
299	int i;
300	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
301	struct ns2_led_data *leds_data;
302
303	leds_data = platform_get_drvdata(pdev);
304
305	for (i = 0; i < pdata->num_leds; i++)
306	delete_ns2_led(&leds_data[i]);
307
308	kfree(leds_data);
309	platform_set_drvdata(pdev, NULL);
310
311	return 0;
312	}
313
314	static struct platform_driver ns2_led_driver = {
315	.probe = ns2_led_probe,
316	.remove = __devexit_p(ns2_led_remove),
317	.driver = {
318	.name = "leds-ns2",
319	.owner = THIS_MODULE,
320	},
321	};
322	MODULE_ALIAS("platform:leds-ns2");
323
324	static int __init ns2_led_init(void)
325	{
326	return platform_driver_register(&ns2_led_driver);
327	}
328
329	static void __exit ns2_led_exit(void)
330	{
331	platform_driver_unregister(&ns2_led_driver);
332	}
333
334	module_init(ns2_led_init);
335	module_exit(ns2_led_exit);
336
337	MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
338	MODULE_DESCRIPTION("Network Space v2 LED driver");
339	MODULE_LICENSE("GPL");