1 /*
2 * Miscellaneous procedures for dealing with the PowerMac hardware.
3 * Contains support for the backlight.
4 *
5 * Copyright (C) 2000 Benjamin Herrenschmidt
6 *
7 */
8
9 #include <linux/config.h>
10 #include <linux/kernel.h>
11 #include <linux/stddef.h>
12 #include <linux/reboot.h>
13 #include <linux/nvram.h>
14 #include <asm/sections.h>
15 #include <asm/ptrace.h>
16 #include <asm/io.h>
17 #include <asm/pgtable.h>
18 #include <asm/system.h>
19 #include <asm/prom.h>
20 #include <asm/machdep.h>
21 #include <asm/nvram.h>
22 #include <asm/backlight.h>
23
24 #include <linux/adb.h>
25 #include <linux/pmu.h>
26
27 static struct backlight_controller *backlighter = NULL;
28 static void* backlighter_data = NULL;
29 static int backlight_autosave = 0;
30 static int backlight_level = BACKLIGHT_MAX;
31 static int backlight_enabled = 1;
32
33 void __pmac
register_backlight_controller(struct backlight_controller * ctrler,void * data,char * type)34 register_backlight_controller(struct backlight_controller *ctrler, void *data, char *type)
35 {
36 struct device_node* bk_node;
37 char *prop;
38 int valid = 0;
39
40 bk_node = find_devices("backlight");
41
42 #ifdef CONFIG_ADB_PMU
43 /* Special case for the old PowerBook since I can't test on it */
44 backlight_autosave = machine_is_compatible("AAPL,3400/2400")
45 || machine_is_compatible("AAPL,3500");
46 if ((backlight_autosave
47 || machine_is_compatible("AAPL,PowerBook1998")
48 || machine_is_compatible("PowerBook1,1"))
49 && !strcmp(type, "pmu"))
50 valid = 1;
51 #endif
52 if (bk_node) {
53 prop = get_property(bk_node, "backlight-control", NULL);
54 if (prop && !strncmp(prop, type, strlen(type)))
55 valid = 1;
56 }
57 if (!valid)
58 return;
59 backlighter = ctrler;
60 backlighter_data = data;
61
62 if (bk_node && !backlight_autosave)
63 prop = get_property(bk_node, "bklt", NULL);
64 else
65 prop = NULL;
66 if (prop) {
67 backlight_level = ((*prop)+1) >> 1;
68 if (backlight_level > BACKLIGHT_MAX)
69 backlight_level = BACKLIGHT_MAX;
70 }
71
72 #ifdef CONFIG_ADB_PMU
73 if (backlight_autosave) {
74 struct adb_request req;
75 pmu_request(&req, NULL, 2, 0xd9, 0);
76 while (!req.complete)
77 pmu_poll();
78 backlight_level = req.reply[0] >> 4;
79 }
80 #endif
81 if (!backlighter->set_enable(1, backlight_level, data))
82 backlight_enabled = 1;
83
84 printk(KERN_INFO "Registered \"%s\" backlight controller, level: %d/15\n",
85 type, backlight_level);
86 }
87
88 void __pmac
unregister_backlight_controller(struct backlight_controller * ctrler,void * data)89 unregister_backlight_controller(struct backlight_controller *ctrler, void *data)
90 {
91 /* We keep the current backlight level (for now) */
92 if (ctrler == backlighter && data == backlighter_data)
93 backlighter = NULL;
94 }
95
96 int __pmac
set_backlight_enable(int enable)97 set_backlight_enable(int enable)
98 {
99 int rc;
100
101 if (!backlighter)
102 return -ENODEV;
103 rc = backlighter->set_enable(enable, backlight_level, backlighter_data);
104 if (!rc)
105 backlight_enabled = enable;
106 return rc;
107 }
108
109 int __pmac
get_backlight_enable(void)110 get_backlight_enable(void)
111 {
112 if (!backlighter)
113 return -ENODEV;
114 return backlight_enabled;
115 }
116
117 int __pmac
set_backlight_level(int level)118 set_backlight_level(int level)
119 {
120 int rc = 0;
121
122 if (!backlighter)
123 return -ENODEV;
124 if (level < BACKLIGHT_MIN)
125 level = BACKLIGHT_OFF;
126 if (level > BACKLIGHT_MAX)
127 level = BACKLIGHT_MAX;
128 if (backlight_enabled)
129 rc = backlighter->set_level(level, backlighter_data);
130 if (!rc)
131 backlight_level = level;
132 if (!rc && !backlight_autosave) {
133 level <<=1;
134 if (level & 0x10)
135 level |= 0x01;
136 // -- todo: save to property "bklt"
137 }
138 return rc;
139 }
140
141 int __pmac
get_backlight_level(void)142 get_backlight_level(void)
143 {
144 if (!backlighter)
145 return -ENODEV;
146 return backlight_level;
147 }
148