blob: 74dce4ba0262560977ae88d69fbb2fbe7db62009 [file] [log] [blame]
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
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
103static 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
122static 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
139static 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
171static 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
179static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
180
181static int __devinit
182create_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
243err_free_cdev:
244 led_classdev_unregister(&led_dat->cdev);
245err_free_slow:
246 gpio_free(led_dat->slow);
247err_free_cmd:
248 gpio_free(led_dat->cmd);
249
250 return ret;
251}
252
253static 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
261static 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
287err:
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
296static 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
313static 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};
321MODULE_ALIAS("platform:leds-ns2");
322
323static int __init ns2_led_init(void)
324{
325 return platform_driver_register(&ns2_led_driver);
326}
327
328static void __exit ns2_led_exit(void)
329{
330 platform_driver_unregister(&ns2_led_driver);
331}
332
333module_init(ns2_led_init);
334module_exit(ns2_led_exit);
335
336MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
337MODULE_DESCRIPTION("Network Space v2 LED driver");
338MODULE_LICENSE("GPL");