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1/*
2 * via-pmu LED class device
3 *
4 * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
14 * NON INFRINGEMENT. See the GNU General Public License for more
15 * details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 *
21 */
22#include <linux/types.h>
23#include <linux/kernel.h>
24#include <linux/device.h>
25#include <linux/leds.h>
26#include <linux/adb.h>
27#include <linux/pmu.h>
28#include <asm/prom.h>
29
30static spinlock_t pmu_blink_lock;
31static struct adb_request pmu_blink_req;
32/* -1: no change, 0: request off, 1: request on */
33static int requested_change;
34
35static void pmu_req_done(struct adb_request * req)
36{
37 unsigned long flags;
38
39 spin_lock_irqsave(&pmu_blink_lock, flags);
40 /* if someone requested a change in the meantime
41 * (we only see the last one which is fine)
42 * then apply it now */
43 if (requested_change != -1 && !pmu_sys_suspended)
44 pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
45 /* reset requested change */
46 requested_change = -1;
47 spin_unlock_irqrestore(&pmu_blink_lock, flags);
48}
49
50static void pmu_led_set(struct led_classdev *led_cdev,
51 enum led_brightness brightness)
52{
53 unsigned long flags;
54
55 spin_lock_irqsave(&pmu_blink_lock, flags);
56 switch (brightness) {
57 case LED_OFF:
58 requested_change = 0;
59 break;
60 case LED_FULL:
61 requested_change = 1;
62 break;
63 default:
64 goto out;
65 break;
66 }
67 /* if request isn't done, then don't do anything */
68 if (pmu_blink_req.complete && !pmu_sys_suspended)
69 pmu_request(&pmu_blink_req, NULL, 4, 0xee, 4, 0, requested_change);
70 out:
71 spin_unlock_irqrestore(&pmu_blink_lock, flags);
72}
73
74static struct led_classdev pmu_led = {
75 .name = "pmu-led::front",
76#ifdef CONFIG_ADB_PMU_LED_DISK
77 .default_trigger = "disk-activity",
78#endif
79 .brightness_set = pmu_led_set,
80};
81
82static int __init via_pmu_led_init(void)
83{
84 struct device_node *dt;
85 const char *model;
86
87 /* only do this on keylargo based models */
88 if (pmu_get_model() != PMU_KEYLARGO_BASED)
89 return -ENODEV;
90
91 dt = of_find_node_by_path("/");
92 if (dt == NULL)
93 return -ENODEV;
94 model = of_get_property(dt, "model", NULL);
95 if (model == NULL) {
96 of_node_put(dt);
97 return -ENODEV;
98 }
99 if (strncmp(model, "PowerBook", strlen("PowerBook")) != 0 &&
100 strncmp(model, "iBook", strlen("iBook")) != 0 &&
101 strcmp(model, "PowerMac7,2") != 0 &&
102 strcmp(model, "PowerMac7,3") != 0) {
103 of_node_put(dt);
104 /* ignore */
105 return -ENODEV;
106 }
107 of_node_put(dt);
108
109 spin_lock_init(&pmu_blink_lock);
110 /* no outstanding req */
111 pmu_blink_req.complete = 1;
112 pmu_blink_req.done = pmu_req_done;
113
114 return led_classdev_register(NULL, &pmu_led);
115}
116
117late_initcall(via_pmu_led_init);
118

Warning: That file was not part of the compilation database. It may have many parsing errors.