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10#include <asm/ptrace.h>
11#include <linux/adb.h>
12#include <linux/pmu.h>
13#include <asm/backlight.h>
14#include <asm/prom.h>
15
16#define MAX_PMU_LEVEL 0xFF
17
18static struct backlight_ops pmu_backlight_data;
19static DEFINE_SPINLOCK(pmu_backlight_lock);
20static int sleeping, uses_pmu_bl;
21static u8 bl_curve[FB_BACKLIGHT_LEVELS];
22
23static void pmu_backlight_init_curve(u8 off, u8 min, u8 max)
24{
25 int i, flat, count, range = (max - min);
26
27 bl_curve[0] = off;
28
29 for (flat = 1; flat < (FB_BACKLIGHT_LEVELS / 16); ++flat)
30 bl_curve[flat] = min;
31
32 count = FB_BACKLIGHT_LEVELS * 15 / 16;
33 for (i = 0; i < count; ++i)
34 bl_curve[flat + i] = min + (range * (i + 1) / count);
35}
36
37static int pmu_backlight_curve_lookup(int value)
38{
39 int level = (FB_BACKLIGHT_LEVELS - 1);
40 int i, max = 0;
41
42
43 for (i = 0; i < FB_BACKLIGHT_LEVELS; i++)
44 max = max((int)bl_curve[i], max);
45
46
47 for (i = 0; i < FB_BACKLIGHT_LEVELS; i++) {
48 int diff = abs(bl_curve[i] - value);
49 if (diff < max) {
50 max = diff;
51 level = i;
52 }
53 }
54 return level;
55}
56
57static int pmu_backlight_get_level_brightness(int level)
58{
59 int pmulevel;
60
61
62 pmulevel = bl_curve[level] * FB_BACKLIGHT_MAX / MAX_PMU_LEVEL;
63 if (pmulevel < 0)
64 pmulevel = 0;
65 else if (pmulevel > MAX_PMU_LEVEL)
66 pmulevel = MAX_PMU_LEVEL;
67
68 return pmulevel;
69}
70
71static int __pmu_backlight_update_status(struct backlight_device *bd)
72{
73 struct adb_request req;
74 int level = bd->props.brightness;
75
76
77 if (bd->props.power != FB_BLANK_UNBLANK ||
78 bd->props.fb_blank != FB_BLANK_UNBLANK)
79 level = 0;
80
81 if (level > 0) {
82 int pmulevel = pmu_backlight_get_level_brightness(level);
83
84 pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT, pmulevel);
85 pmu_wait_complete(&req);
86
87 pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
88 PMU_POW_BACKLIGHT | PMU_POW_ON);
89 pmu_wait_complete(&req);
90 } else {
91 pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
92 PMU_POW_BACKLIGHT | PMU_POW_OFF);
93 pmu_wait_complete(&req);
94 }
95
96 return 0;
97}
98
99static int pmu_backlight_update_status(struct backlight_device *bd)
100{
101 unsigned long flags;
102 int rc = 0;
103
104 spin_lock_irqsave(&pmu_backlight_lock, flags);
105
106 if (!sleeping)
107 rc = __pmu_backlight_update_status(bd);
108 spin_unlock_irqrestore(&pmu_backlight_lock, flags);
109 return rc;
110}
111
112
113static int pmu_backlight_get_brightness(struct backlight_device *bd)
114{
115 return bd->props.brightness;
116}
117
118static struct backlight_ops pmu_backlight_data = {
119 .get_brightness = pmu_backlight_get_brightness,
120 .update_status = pmu_backlight_update_status,
121
122};
123
124#ifdef CONFIG_PM
125void pmu_backlight_set_sleep(int sleep)
126{
127 unsigned long flags;
128
129 spin_lock_irqsave(&pmu_backlight_lock, flags);
130 sleeping = sleep;
131 if (pmac_backlight && uses_pmu_bl) {
132 if (sleep) {
133 struct adb_request req;
134
135 pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
136 PMU_POW_BACKLIGHT | PMU_POW_OFF);
137 pmu_wait_complete(&req);
138 } else
139 __pmu_backlight_update_status(pmac_backlight);
140 }
141 spin_unlock_irqrestore(&pmu_backlight_lock, flags);
142}
143#endif
144
145void __init pmu_backlight_init()
146{
147 struct backlight_device *bd;
148 char name[10];
149 int level, autosave;
150
151
152 autosave =
153 machine_is_compatible("AAPL,3400/2400") ||
154 machine_is_compatible("AAPL,3500");
155
156 if (!autosave &&
157 !pmac_has_backlight_type("pmu") &&
158 !machine_is_compatible("AAPL,PowerBook1998") &&
159 !machine_is_compatible("PowerBook1,1"))
160 return;
161
162 snprintf(name, sizeof(name), "pmubl");
163
164 bd = backlight_device_register(name, NULL, NULL, &pmu_backlight_data);
165 if (IS_ERR(bd)) {
166 printk(KERN_ERR "PMU Backlight registration failed\n");
167 return;
168 }
169 uses_pmu_bl = 1;
170 bd->props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
171 pmu_backlight_init_curve(0x7F, 0x46, 0x0E);
172
173 level = bd->props.max_brightness;
174
175 if (autosave) {
176
177 struct adb_request req;
178 pmu_request(&req, NULL, 2, 0xd9, 0);
179 pmu_wait_complete(&req);
180
181 level = pmu_backlight_curve_lookup(
182 (req.reply[0] >> 4) *
183 bd->props.max_brightness / 15);
184 }
185
186 bd->props.brightness = level;
187 bd->props.power = FB_BLANK_UNBLANK;
188 backlight_update_status(bd);
189
190 printk(KERN_INFO "PMU Backlight initialized (%s)\n", name);
191}
192
