[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(&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(&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;

	write_lock(&led_dat->rw_lock);

	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(&led_dat->rw_lock);
}

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
84	read_lock(&led_dat->rw_lock);
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
98	read_unlock(&led_dat->rw_lock);
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;
107
108	write_lock(&led_dat->rw_lock);
109
110	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
111	if (mode == ns2_led_modval[i].mode) {
112	gpio_set_value(led_dat->cmd,
113	ns2_led_modval[i].cmd_level);
114	gpio_set_value(led_dat->slow,
115	ns2_led_modval[i].slow_level);
116	}
117	}
118
119	write_unlock(&led_dat->rw_lock);
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	{
143	int ret;
144	unsigned long enable;
145	enum ns2_led_modes mode;
146	struct ns2_led_data *led_dat = dev_get_drvdata(dev);
147
148	ret = strict_strtoul(buff, 10, &enable);
149	if (ret < 0)
150	return ret;
151
152	enable = !!enable;
153
154	if (led_dat->sata == enable)
155	return count;
156
157	ret = ns2_led_get_mode(led_dat, &mode);
158	if (ret < 0)
159	return ret;
160
161	if (enable && mode == NS_V2_LED_ON)
162	ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
163	if (!enable && mode == NS_V2_LED_SATA)
164	ns2_led_set_mode(led_dat, NS_V2_LED_ON);
165
166	led_dat->sata = enable;
167
168	return count;
169	}
170
171	static ssize_t ns2_led_sata_show(struct device *dev,
172	struct device_attribute attr, char buf)
173	{
174	struct ns2_led_data *led_dat = dev_get_drvdata(dev);
175
176	return sprintf(buf, "%d\n", led_dat->sata);
177	}
178
179	static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
180
181	static int __devinit
182	create_ns2_led(struct platform_device pdev, struct ns2_led_data led_dat,
183	const struct ns2_led *template)
184	{
185	int ret;
186	enum ns2_led_modes mode;
187
188	ret = gpio_request(template->cmd, template->name);
189	if (ret == 0) {
190	ret = gpio_direction_output(template->cmd,
191	gpio_get_value(template->cmd));
192	if (ret)
193	gpio_free(template->cmd);
194	}
195	if (ret) {
196	dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
197	template->name);
198	}
199
200	ret = gpio_request(template->slow, template->name);
201	if (ret == 0) {
202	ret = gpio_direction_output(template->slow,
203	gpio_get_value(template->slow));
204	if (ret)
205	gpio_free(template->slow);
206	}
207	if (ret) {
208	dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
209	template->name);
210	goto err_free_cmd;
211	}
212
213	rwlock_init(&led_dat->rw_lock);
214
215	led_dat->cdev.name = template->name;
216	led_dat->cdev.default_trigger = template->default_trigger;
217	led_dat->cdev.blink_set = NULL;
218	led_dat->cdev.brightness_set = ns2_led_set;
219	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
220	led_dat->cmd = template->cmd;
221	led_dat->slow = template->slow;
222
223	ret = ns2_led_get_mode(led_dat, &mode);
224	if (ret < 0)
225	goto err_free_slow;
226
227	/* Set LED initial state. */
228	led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
229	led_dat->cdev.brightness =
230	(mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
231
232	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
233	if (ret < 0)
234	goto err_free_slow;
235
236	dev_set_drvdata(led_dat->cdev.dev, led_dat);
237	ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
238	if (ret < 0)
239	goto err_free_cdev;
240
241	return 0;
242
243	err_free_cdev:
244	led_classdev_unregister(&led_dat->cdev);
245	err_free_slow:
246	gpio_free(led_dat->slow);
247	err_free_cmd:
248	gpio_free(led_dat->cmd);
249
250	return ret;
251	}
252
253	static void __devexit delete_ns2_led(struct ns2_led_data *led_dat)
254	{
255	device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
256	led_classdev_unregister(&led_dat->cdev);
257	gpio_free(led_dat->cmd);
258	gpio_free(led_dat->slow);
259	}
260
261	static int __devinit ns2_led_probe(struct platform_device *pdev)
262	{
263	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
264	struct ns2_led_data *leds_data;
265	int i;
266	int ret;
267
268	if (!pdata)
269	return -EINVAL;
270
271	leds_data = kzalloc(sizeof(struct ns2_led_data) *
272	pdata->num_leds, GFP_KERNEL);
273	if (!leds_data)
274	return -ENOMEM;
275
276	for (i = 0; i < pdata->num_leds; i++) {
277	ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
278	if (ret < 0)
279	goto err;
280
281	}
282
283	platform_set_drvdata(pdev, leds_data);
284
285	return 0;
286
287	err:
288	for (i = i - 1; i >= 0; i--)
289	delete_ns2_led(&leds_data[i]);
290
291	kfree(leds_data);
292
293	return ret;
294	}
295
296	static int __devexit ns2_led_remove(struct platform_device *pdev)
297	{
298	int i;
299	struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
300	struct ns2_led_data *leds_data;
301
302	leds_data = platform_get_drvdata(pdev);
303
304	for (i = 0; i < pdata->num_leds; i++)
305	delete_ns2_led(&leds_data[i]);
306
307	kfree(leds_data);
308	platform_set_drvdata(pdev, NULL);
309
310	return 0;
311	}
312
313	static struct platform_driver ns2_led_driver = {
314	.probe = ns2_led_probe,
315	.remove = __devexit_p(ns2_led_remove),
316	.driver = {
317	.name = "leds-ns2",
318	.owner = THIS_MODULE,
319	},
320	};
321	MODULE_ALIAS("platform:leds-ns2");
322
323	static int __init ns2_led_init(void)
324	{
325	return platform_driver_register(&ns2_led_driver);
326	}
327
328	static void __exit ns2_led_exit(void)
329	{
330	platform_driver_unregister(&ns2_led_driver);
331	}
332
333	module_init(ns2_led_init);
334	module_exit(ns2_led_exit);
335
336	MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
337	MODULE_DESCRIPTION("Network Space v2 LED driver");
338	MODULE_LICENSE("GPL");