2 * Backlight code for via-pmu
4 * Copyright (C) 1998 Paul Mackerras and Fabio Riccardi.
5 * Copyright (C) 2001-2002 Benjamin Herrenschmidt
6 * Copyright (C) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
10 #include <asm/ptrace.h>
11 #include <linux/adb.h>
12 #include <linux/pmu.h>
13 #include <asm/backlight.h>
16 #define MAX_PMU_LEVEL 0xFF
18 static struct device_node
*vias
;
19 static struct backlight_properties pmu_backlight_data
;
21 static int pmu_backlight_get_level_brightness(struct fb_info
*info
,
26 /* Get and convert the value */
27 mutex_lock(&info
->bl_mutex
);
28 pmulevel
= info
->bl_curve
[level
] * FB_BACKLIGHT_MAX
/ MAX_PMU_LEVEL
;
29 mutex_unlock(&info
->bl_mutex
);
33 else if (pmulevel
> MAX_PMU_LEVEL
)
34 pmulevel
= MAX_PMU_LEVEL
;
39 static int pmu_backlight_update_status(struct backlight_device
*bd
)
41 struct fb_info
*info
= class_get_devdata(&bd
->class_dev
);
42 struct adb_request req
;
43 int pmulevel
, level
= bd
->props
->brightness
;
48 if (bd
->props
->power
!= FB_BLANK_UNBLANK
||
49 bd
->props
->fb_blank
!= FB_BLANK_UNBLANK
)
52 pmulevel
= pmu_backlight_get_level_brightness(info
, level
);
54 pmu_request(&req
, NULL
, 2, PMU_BACKLIGHT_BRIGHT
, pmulevel
);
55 pmu_wait_complete(&req
);
57 pmu_request(&req
, NULL
, 2, PMU_POWER_CTRL
,
58 PMU_POW_BACKLIGHT
| (level
> 0 ? PMU_POW_ON
: PMU_POW_OFF
));
59 pmu_wait_complete(&req
);
64 static int pmu_backlight_get_brightness(struct backlight_device
*bd
)
66 return bd
->props
->brightness
;
69 static struct backlight_properties pmu_backlight_data
= {
71 .get_brightness
= pmu_backlight_get_brightness
,
72 .update_status
= pmu_backlight_update_status
,
73 .max_brightness
= (FB_BACKLIGHT_LEVELS
- 1),
76 void __init
pmu_backlight_init(struct device_node
*in_vias
)
78 struct backlight_device
*bd
;
85 /* Special case for the old PowerBook since I can't test on it */
87 machine_is_compatible("AAPL,3400/2400") ||
88 machine_is_compatible("AAPL,3500");
91 !pmac_has_backlight_type("pmu") &&
92 !machine_is_compatible("AAPL,PowerBook1998") &&
93 !machine_is_compatible("PowerBook1,1"))
96 /* Actually, this is a hack, but I don't know of a better way
97 * to get the first framebuffer device.
99 info
= registered_fb
[0];
101 printk("pmubl: No framebuffer found\n");
105 snprintf(name
, sizeof(name
), "pmubl%d", info
->node
);
107 bd
= backlight_device_register(name
, info
, &pmu_backlight_data
);
109 printk("pmubl: Backlight registration failed\n");
113 mutex_lock(&info
->bl_mutex
);
115 fb_bl_default_curve(info
, 0x7F, 0x46, 0x0E);
116 mutex_unlock(&info
->bl_mutex
);
118 level
= pmu_backlight_data
.max_brightness
;
121 /* read autosaved value if available */
122 struct adb_request req
;
123 pmu_request(&req
, NULL
, 2, 0xd9, 0);
124 pmu_wait_complete(&req
);
126 mutex_lock(&info
->bl_mutex
);
127 level
= pmac_backlight_curve_lookup(info
,
128 (req
.reply
[0] >> 4) *
129 pmu_backlight_data
.max_brightness
/ 15);
130 mutex_unlock(&info
->bl_mutex
);
134 bd
->props
->brightness
= level
;
135 bd
->props
->power
= FB_BLANK_UNBLANK
;
136 bd
->props
->update_status(bd
);
139 mutex_lock(&pmac_backlight_mutex
);
142 mutex_unlock(&pmac_backlight_mutex
);
144 printk("pmubl: Backlight initialized (%s)\n", name
);