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Simon Guinot11efe712010-07-06 16:08:46 +02001/*
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
49enum ns2_led_modes {
50 NS_V2_LED_OFF,
51 NS_V2_LED_ON,
52 NS_V2_LED_SATA,
53};
54
55struct ns2_led_mode_value {
56 enum ns2_led_modes mode;
57 int cmd_level;
58 int slow_level;
59};
60
61static 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
68struct 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
76static 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
Simon Guinotf539dfe2010-09-19 15:30:59 +020084 read_lock_irq(&led_dat->rw_lock);
Simon Guinot11efe712010-07-06 16:08:46 +020085
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
Simon Guinotf539dfe2010-09-19 15:30:59 +020098 read_unlock_irq(&led_dat->rw_lock);
Simon Guinot11efe712010-07-06 16:08:46 +020099
100 return ret;
101}
102
103static void ns2_led_set_mode(struct ns2_led_data *led_dat,
104 enum ns2_led_modes mode)
105{
106 int i;
Simon Guinotf539dfe2010-09-19 15:30:59 +0200107 unsigned long flags;
Simon Guinot11efe712010-07-06 16:08:46 +0200108
Simon Guinotf539dfe2010-09-19 15:30:59 +0200109 write_lock_irqsave(&led_dat->rw_lock, flags);
Simon Guinot11efe712010-07-06 16:08:46 +0200110
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
Simon Guinotf539dfe2010-09-19 15:30:59 +0200120 write_unlock_irqrestore(&led_dat->rw_lock, flags);
Simon Guinot11efe712010-07-06 16:08:46 +0200121}
122
123static 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
140static ssize_t ns2_led_sata_store(struct device *dev,
141 struct device_attribute *attr,
142 const char *buff, size_t count)
143{
Simon Guinote5971bb2010-10-07 16:35:40 +0200144 struct led_classdev *led_cdev = dev_get_drvdata(dev);
145 struct ns2_led_data *led_dat =
146 container_of(led_cdev, struct ns2_led_data, cdev);
Simon Guinot11efe712010-07-06 16:08:46 +0200147 int ret;
148 unsigned long enable;
149 enum ns2_led_modes mode;
Simon Guinot11efe712010-07-06 16:08:46 +0200150
151 ret = strict_strtoul(buff, 10, &enable);
152 if (ret < 0)
153 return ret;
154
155 enable = !!enable;
156
157 if (led_dat->sata == enable)
158 return count;
159
160 ret = ns2_led_get_mode(led_dat, &mode);
161 if (ret < 0)
162 return ret;
163
164 if (enable && mode == NS_V2_LED_ON)
165 ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
166 if (!enable && mode == NS_V2_LED_SATA)
167 ns2_led_set_mode(led_dat, NS_V2_LED_ON);
168
169 led_dat->sata = enable;
170
171 return count;
172}
173
174static ssize_t ns2_led_sata_show(struct device *dev,
175 struct device_attribute *attr, char *buf)
176{
Simon Guinote5971bb2010-10-07 16:35:40 +0200177 struct led_classdev *led_cdev = dev_get_drvdata(dev);
178 struct ns2_led_data *led_dat =
179 container_of(led_cdev, struct ns2_led_data, cdev);
Simon Guinot11efe712010-07-06 16:08:46 +0200180
181 return sprintf(buf, "%d\n", led_dat->sata);
182}
183
184static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
185
186static int __devinit
187create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
188 const struct ns2_led *template)
189{
190 int ret;
191 enum ns2_led_modes mode;
192
193 ret = gpio_request(template->cmd, template->name);
194 if (ret == 0) {
195 ret = gpio_direction_output(template->cmd,
196 gpio_get_value(template->cmd));
197 if (ret)
198 gpio_free(template->cmd);
199 }
200 if (ret) {
201 dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
202 template->name);
203 }
204
205 ret = gpio_request(template->slow, template->name);
206 if (ret == 0) {
207 ret = gpio_direction_output(template->slow,
208 gpio_get_value(template->slow));
209 if (ret)
210 gpio_free(template->slow);
211 }
212 if (ret) {
213 dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
214 template->name);
215 goto err_free_cmd;
216 }
217
218 rwlock_init(&led_dat->rw_lock);
219
220 led_dat->cdev.name = template->name;
221 led_dat->cdev.default_trigger = template->default_trigger;
222 led_dat->cdev.blink_set = NULL;
223 led_dat->cdev.brightness_set = ns2_led_set;
224 led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
225 led_dat->cmd = template->cmd;
226 led_dat->slow = template->slow;
227
228 ret = ns2_led_get_mode(led_dat, &mode);
229 if (ret < 0)
230 goto err_free_slow;
231
232 /* Set LED initial state. */
233 led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
234 led_dat->cdev.brightness =
235 (mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
236
237 ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
238 if (ret < 0)
239 goto err_free_slow;
240
Simon Guinot11efe712010-07-06 16:08:46 +0200241 ret = device_create_file(led_dat->cdev.dev, &dev_attr_sata);
242 if (ret < 0)
243 goto err_free_cdev;
244
245 return 0;
246
247err_free_cdev:
248 led_classdev_unregister(&led_dat->cdev);
249err_free_slow:
250 gpio_free(led_dat->slow);
251err_free_cmd:
252 gpio_free(led_dat->cmd);
253
254 return ret;
255}
256
257static void __devexit delete_ns2_led(struct ns2_led_data *led_dat)
258{
259 device_remove_file(led_dat->cdev.dev, &dev_attr_sata);
260 led_classdev_unregister(&led_dat->cdev);
261 gpio_free(led_dat->cmd);
262 gpio_free(led_dat->slow);
263}
264
265static int __devinit ns2_led_probe(struct platform_device *pdev)
266{
267 struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
268 struct ns2_led_data *leds_data;
269 int i;
270 int ret;
271
272 if (!pdata)
273 return -EINVAL;
274
275 leds_data = kzalloc(sizeof(struct ns2_led_data) *
276 pdata->num_leds, GFP_KERNEL);
277 if (!leds_data)
278 return -ENOMEM;
279
280 for (i = 0; i < pdata->num_leds; i++) {
281 ret = create_ns2_led(pdev, &leds_data[i], &pdata->leds[i]);
282 if (ret < 0)
283 goto err;
284
285 }
286
287 platform_set_drvdata(pdev, leds_data);
288
289 return 0;
290
291err:
292 for (i = i - 1; i >= 0; i--)
293 delete_ns2_led(&leds_data[i]);
294
295 kfree(leds_data);
296
297 return ret;
298}
299
300static int __devexit ns2_led_remove(struct platform_device *pdev)
301{
302 int i;
303 struct ns2_led_platform_data *pdata = pdev->dev.platform_data;
304 struct ns2_led_data *leds_data;
305
306 leds_data = platform_get_drvdata(pdev);
307
308 for (i = 0; i < pdata->num_leds; i++)
309 delete_ns2_led(&leds_data[i]);
310
311 kfree(leds_data);
312 platform_set_drvdata(pdev, NULL);
313
314 return 0;
315}
316
317static struct platform_driver ns2_led_driver = {
318 .probe = ns2_led_probe,
319 .remove = __devexit_p(ns2_led_remove),
320 .driver = {
321 .name = "leds-ns2",
322 .owner = THIS_MODULE,
323 },
324};
325MODULE_ALIAS("platform:leds-ns2");
326
327static int __init ns2_led_init(void)
328{
329 return platform_driver_register(&ns2_led_driver);
330}
331
332static void __exit ns2_led_exit(void)
333{
334 platform_driver_unregister(&ns2_led_driver);
335}
336
337module_init(ns2_led_init);
338module_exit(ns2_led_exit);
339
340MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
341MODULE_DESCRIPTION("Network Space v2 LED driver");
342MODULE_LICENSE("GPL");