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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/platform_device.h>
27#include <linux/slab.h>
28#include <linux/gpio.h>
29#include <linux/leds.h>
30#include <linux/module.h>
31#include <linux/platform_data/leds-kirkwood-ns2.h>
32#include <linux/of.h>
33#include <linux/of_gpio.h>
34#include "leds.h"
35
36/*
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.
41 */
42
43struct ns2_led_data {
44 struct led_classdev cdev;
45 unsigned cmd;
46 unsigned slow;
47 bool can_sleep;
48 unsigned char sata; /* True when SATA mode active. */
49 rwlock_t rw_lock; /* Lock GPIOs. */
50 int num_modes;
51 struct ns2_led_modval *modval;
52};
53
54static int ns2_led_get_mode(struct ns2_led_data *led_dat,
55 enum ns2_led_modes *mode)
56{
57 int i;
58 int ret = -EINVAL;
59 int cmd_level;
60 int slow_level;
61
62 cmd_level = gpio_get_value_cansleep(led_dat->cmd);
63 slow_level = gpio_get_value_cansleep(led_dat->slow);
64
65 for (i = 0; i < led_dat->num_modes; i++) {
66 if (cmd_level == led_dat->modval[i].cmd_level &&
67 slow_level == led_dat->modval[i].slow_level) {
68 *mode = led_dat->modval[i].mode;
69 ret = 0;
70 break;
71 }
72 }
73
74 return ret;
75}
76
77static void ns2_led_set_mode(struct ns2_led_data *led_dat,
78 enum ns2_led_modes mode)
79{
80 int i;
81 bool found = false;
82 unsigned long flags;
83
84 for (i = 0; i < led_dat->num_modes; i++)
85 if (mode == led_dat->modval[i].mode) {
86 found = true;
87 break;
88 }
89
90 if (!found)
91 return;
92
93 write_lock_irqsave(&led_dat->rw_lock, flags);
94
95 if (!led_dat->can_sleep) {
96 gpio_set_value(led_dat->cmd,
97 led_dat->modval[i].cmd_level);
98 gpio_set_value(led_dat->slow,
99 led_dat->modval[i].slow_level);
100 goto exit_unlock;
101 }
102
103 gpio_set_value_cansleep(led_dat->cmd, led_dat->modval[i].cmd_level);
104 gpio_set_value_cansleep(led_dat->slow, led_dat->modval[i].slow_level);
105
106exit_unlock:
107 write_unlock_irqrestore(&led_dat->rw_lock, flags);
108}
109
110static void ns2_led_set(struct led_classdev *led_cdev,
111 enum led_brightness value)
112{
113 struct ns2_led_data *led_dat =
114 container_of(led_cdev, struct ns2_led_data, cdev);
115 enum ns2_led_modes mode;
116
117 if (value == LED_OFF)
118 mode = NS_V2_LED_OFF;
119 else if (led_dat->sata)
120 mode = NS_V2_LED_SATA;
121 else
122 mode = NS_V2_LED_ON;
123
124 ns2_led_set_mode(led_dat, mode);
125}
126
127static int ns2_led_set_blocking(struct led_classdev *led_cdev,
128 enum led_brightness value)
129{
130 ns2_led_set(led_cdev, value);
131 return 0;
132}
133
134static ssize_t ns2_led_sata_store(struct device *dev,
135 struct device_attribute *attr,
136 const char *buff, size_t count)
137{
138 struct led_classdev *led_cdev = dev_get_drvdata(dev);
139 struct ns2_led_data *led_dat =
140 container_of(led_cdev, struct ns2_led_data, cdev);
141 int ret;
142 unsigned long enable;
143
144 ret = kstrtoul(buff, 10, &enable);
145 if (ret < 0)
146 return ret;
147
148 enable = !!enable;
149
150 if (led_dat->sata == enable)
151 goto exit;
152
153 led_dat->sata = enable;
154
155 if (!led_get_brightness(led_cdev))
156 goto exit;
157
158 if (enable)
159 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
160 else
161 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
162
163exit:
164 return count;
165}
166
167static ssize_t ns2_led_sata_show(struct device *dev,
168 struct device_attribute *attr, char *buf)
169{
170 struct led_classdev *led_cdev = dev_get_drvdata(dev);
171 struct ns2_led_data *led_dat =
172 container_of(led_cdev, struct ns2_led_data, cdev);
173
174 return sprintf(buf, "%d\n", led_dat->sata);
175}
176
177static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
178
179static struct attribute *ns2_led_attrs[] = {
180 &dev_attr_sata.attr,
181 NULL
182};
183ATTRIBUTE_GROUPS(ns2_led);
184
185static int
186create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
187 const struct ns2_led *template)
188{
189 int ret;
190 enum ns2_led_modes mode;
191
192 ret = devm_gpio_request_one(&pdev->dev, template->cmd,
193 gpio_get_value_cansleep(template->cmd) ?
194 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
195 template->name);
196 if (ret) {
197 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
198 template->name);
199 return ret;
200 }
201
202 ret = devm_gpio_request_one(&pdev->dev, template->slow,
203 gpio_get_value_cansleep(template->slow) ?
204 GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
205 template->name);
206 if (ret) {
207 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
208 template->name);
209 return ret;
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.flags |= LED_CORE_SUSPENDRESUME;
218 led_dat->cdev.groups = ns2_led_groups;
219 led_dat->cmd = template->cmd;
220 led_dat->slow = template->slow;
221 led_dat->can_sleep = gpio_cansleep(led_dat->cmd) |
222 gpio_cansleep(led_dat->slow);
223 if (led_dat->can_sleep)
224 led_dat->cdev.brightness_set_blocking = ns2_led_set_blocking;
225 else
226 led_dat->cdev.brightness_set = ns2_led_set;
227 led_dat->modval = template->modval;
228 led_dat->num_modes = template->num_modes;
229
230 ret = ns2_led_get_mode(led_dat, &mode);
231 if (ret < 0)
232 return ret;
233
234 /* Set LED initial state. */
235 led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
236 led_dat->cdev.brightness =
237 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
238
239 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
240 if (ret < 0)
241 return ret;
242
243 return 0;
244}
245
246static void delete_ns2_led(struct ns2_led_data *led_dat)
247{
248 led_classdev_unregister(&led_dat->cdev);
249}
250
251#ifdef CONFIG_OF_GPIO
252/*
253 * Translate OpenFirmware node properties into platform_data.
254 */
255static int
256ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
257{
258 struct device_node *np = dev->of_node;
259 struct device_node *child;
260 struct ns2_led *led, *leds;
261 int num_leds = 0;
262
263 num_leds = of_get_child_count(np);
264 if (!num_leds)
265 return -ENODEV;
266
267 leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
268 GFP_KERNEL);
269 if (!leds)
270 return -ENOMEM;
271
272 led = leds;
273 for_each_child_of_node(np, child) {
274 const char *string;
275 int ret, i, num_modes;
276 struct ns2_led_modval *modval;
277
278 ret = of_get_named_gpio(child, "cmd-gpio", 0);
279 if (ret < 0)
280 return ret;
281 led->cmd = ret;
282 ret = of_get_named_gpio(child, "slow-gpio", 0);
283 if (ret < 0)
284 return ret;
285 led->slow = ret;
286 ret = of_property_read_string(child, "label", &string);
287 led->name = (ret == 0) ? string : child->name;
288 ret = of_property_read_string(child, "linux,default-trigger",
289 &string);
290 if (ret == 0)
291 led->default_trigger = string;
292
293 ret = of_property_count_u32_elems(child, "modes-map");
294 if (ret < 0 || ret % 3) {
295 dev_err(dev,
296 "Missing or malformed modes-map property\n");
297 return -EINVAL;
298 }
299
300 num_modes = ret / 3;
301 modval = devm_kzalloc(dev,
302 num_modes * sizeof(struct ns2_led_modval),
303 GFP_KERNEL);
304 if (!modval)
305 return -ENOMEM;
306
307 for (i = 0; i < num_modes; i++) {
308 of_property_read_u32_index(child,
309 "modes-map", 3 * i,
310 (u32 *) &modval[i].mode);
311 of_property_read_u32_index(child,
312 "modes-map", 3 * i + 1,
313 (u32 *) &modval[i].cmd_level);
314 of_property_read_u32_index(child,
315 "modes-map", 3 * i + 2,
316 (u32 *) &modval[i].slow_level);
317 }
318
319 led->num_modes = num_modes;
320 led->modval = modval;
321
322 led++;
323 }
324
325 pdata->leds = leds;
326 pdata->num_leds = num_leds;
327
328 return 0;
329}
330
331static const struct of_device_id of_ns2_leds_match[] = {
332 { .compatible = "lacie,ns2-leds", },
333 {},
334};
335MODULE_DEVICE_TABLE(of, of_ns2_leds_match);
336#endif /* CONFIG_OF_GPIO */
337
338struct ns2_led_priv {
339 int num_leds;
340 struct ns2_led_data leds_data[];
341};
342
343static inline int sizeof_ns2_led_priv(int num_leds)
344{
345 return sizeof(struct ns2_led_priv) +
346 (sizeof(struct ns2_led_data) * num_leds);
347}
348
349static int ns2_led_probe(struct platform_device *pdev)
350{
351 struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
352 struct ns2_led_priv *priv;
353 int i;
354 int ret;
355
356#ifdef CONFIG_OF_GPIO
357 if (!pdata) {
358 pdata = devm_kzalloc(&pdev->dev,
359 sizeof(struct ns2_led_platform_data),
360 GFP_KERNEL);
361 if (!pdata)
362 return -ENOMEM;
363
364 ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
365 if (ret)
366 return ret;
367 }
368#else
369 if (!pdata)
370 return -EINVAL;
371#endif /* CONFIG_OF_GPIO */
372
373 priv = devm_kzalloc(&pdev->dev,
374 sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
375 if (!priv)
376 return -ENOMEM;
377 priv->num_leds = pdata->num_leds;
378
379 for (i = 0; i < priv->num_leds; i++) {
380 ret = create_ns2_led(pdev, &priv->leds_data[i],
381 &pdata->leds[i]);
382 if (ret < 0) {
383 for (i = i - 1; i >= 0; i--)
384 delete_ns2_led(&priv->leds_data[i]);
385 return ret;
386 }
387 }
388
389 platform_set_drvdata(pdev, priv);
390
391 return 0;
392}
393
394static int ns2_led_remove(struct platform_device *pdev)
395{
396 int i;
397 struct ns2_led_priv *priv;
398
399 priv = platform_get_drvdata(pdev);
400
401 for (i = 0; i < priv->num_leds; i++)
402 delete_ns2_led(&priv->leds_data[i]);
403
404 return 0;
405}
406
407static struct platform_driver ns2_led_driver = {
408 .probe = ns2_led_probe,
409 .remove = ns2_led_remove,
410 .driver = {
411 .name = "leds-ns2",
412 .of_match_table = of_match_ptr(of_ns2_leds_match),
413 },
414};
415
416module_platform_driver(ns2_led_driver);
417
418MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
419MODULE_DESCRIPTION("Network Space v2 LED driver");
420MODULE_LICENSE("GPL");
421MODULE_ALIAS("platform:leds-ns2");
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 <linux/module.h>
32#include <mach/leds-ns2.h>
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
50enum ns2_led_modes {
51 NS_V2_LED_OFF,
52 NS_V2_LED_ON,
53 NS_V2_LED_SATA,
54};
55
56struct ns2_led_mode_value {
57 enum ns2_led_modes mode;
58 int cmd_level;
59 int slow_level;
60};
61
62static 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
69struct 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
77static 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
85 read_lock_irq(&led_dat->rw_lock);
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
99 read_unlock_irq(&led_dat->rw_lock);
100
101 return ret;
102}
103
104static void ns2_led_set_mode(struct ns2_led_data *led_dat,
105 enum ns2_led_modes mode)
106{
107 int i;
108 unsigned long flags;
109
110 write_lock_irqsave(&led_dat->rw_lock, flags);
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
121 write_unlock_irqrestore(&led_dat->rw_lock, flags);
122}
123
124static 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
141static ssize_t ns2_led_sata_store(struct device *dev,
142 struct device_attribute *attr,
143 const char *buff, size_t count)
144{
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);
148 int ret;
149 unsigned long enable;
150 enum ns2_led_modes mode;
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
175static ssize_t ns2_led_sata_show(struct device *dev,
176 struct device_attribute *attr, char *buf)
177{
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);
181
182 return sprintf(buf, "%d\n", led_dat->sata);
183}
184
185static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
186
187static int __devinit
188create_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
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
248err_free_cdev:
249 led_classdev_unregister(&led_dat->cdev);
250err_free_slow:
251 gpio_free(led_dat->slow);
252err_free_cmd:
253 gpio_free(led_dat->cmd);
254
255 return ret;
256}
257
258static void delete_ns2_led(struct ns2_led_data *led_dat)
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
266static int __devinit ns2_led_probe(struct platform_device *pdev)
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
276 leds_data = kzalloc(sizeof(struct ns2_led_data) *
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]);
283 if (ret < 0)
284 goto err;
285
286 }
287
288 platform_set_drvdata(pdev, leds_data);
289
290 return 0;
291
292err:
293 for (i = i - 1; i >= 0; i--)
294 delete_ns2_led(&leds_data[i]);
295
296 kfree(leds_data);
297
298 return ret;
299}
300
301static int __devexit ns2_led_remove(struct platform_device *pdev)
302{
303 int i;
304 struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
305 struct ns2_led_data *leds_data;
306
307 leds_data = platform_get_drvdata(pdev);
308
309 for (i = 0; i < pdata->num_leds; i++)
310 delete_ns2_led(&leds_data[i]);
311
312 kfree(leds_data);
313 platform_set_drvdata(pdev, NULL);
314
315 return 0;
316}
317
318static struct platform_driver ns2_led_driver = {
319 .probe = ns2_led_probe,
320 .remove = __devexit_p(ns2_led_remove),
321 .driver = {
322 .name = "leds-ns2",
323 .owner = THIS_MODULE,
324 },
325};
326
327module_platform_driver(ns2_led_driver);
328
329MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
330MODULE_DESCRIPTION("Network Space v2 LED driver");
331MODULE_LICENSE("GPL");
332MODULE_ALIAS("platform:leds-ns2");