2 * Backlight code for nVidia based graphic cards
4 * Copyright 2004 Antonino Daplas <adaplas@pol.net>
5 * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
12 #include <linux/backlight.h>
14 #include <linux/pci.h>
19 #ifdef CONFIG_PMAC_BACKLIGHT
20 #include <asm/backlight.h>
21 #include <asm/machdep.h>
24 /* We do not have any information about which values are allowed, thus
25 * we used safe values.
27 #define MIN_LEVEL 0x158
28 #define MAX_LEVEL 0x534
29 #define LEVEL_STEP ((MAX_LEVEL - MIN_LEVEL) / FB_BACKLIGHT_MAX)
31 static struct backlight_properties nvidia_bl_data
;
33 /* Call with fb_info->bl_mutex held */
34 static int nvidia_bl_get_level_brightness(struct nvidia_par
*par
,
37 struct fb_info
*info
= pci_get_drvdata(par
->pci_dev
);
40 /* Get and convert the value */
41 nlevel
= MIN_LEVEL
+ info
->bl_curve
[level
] * LEVEL_STEP
;
45 else if (nlevel
< MIN_LEVEL
)
47 else if (nlevel
> MAX_LEVEL
)
53 /* Call with fb_info->bl_mutex held */
54 static int __nvidia_bl_update_status(struct backlight_device
*bd
)
56 struct nvidia_par
*par
= class_get_devdata(&bd
->class_dev
);
57 u32 tmp_pcrt
, tmp_pmc
, fpcontrol
;
63 if (bd
->props
->power
!= FB_BLANK_UNBLANK
||
64 bd
->props
->fb_blank
!= FB_BLANK_UNBLANK
)
67 level
= bd
->props
->brightness
;
69 tmp_pmc
= NV_RD32(par
->PMC
, 0x10F0) & 0x0000FFFF;
70 tmp_pcrt
= NV_RD32(par
->PCRTC0
, 0x081C) & 0xFFFFFFFC;
71 fpcontrol
= NV_RD32(par
->PRAMDAC
, 0x0848) & 0xCFFFFFCC;
75 tmp_pmc
|= (1 << 31); /* backlight bit */
76 tmp_pmc
|= nvidia_bl_get_level_brightness(par
, level
) << 16;
77 fpcontrol
|= par
->fpSyncs
;
79 fpcontrol
|= 0x20000022;
81 NV_WR32(par
->PCRTC0
, 0x081C, tmp_pcrt
);
82 NV_WR32(par
->PMC
, 0x10F0, tmp_pmc
);
83 NV_WR32(par
->PRAMDAC
, 0x848, fpcontrol
);
88 static int nvidia_bl_update_status(struct backlight_device
*bd
)
90 struct nvidia_par
*par
= class_get_devdata(&bd
->class_dev
);
91 struct fb_info
*info
= pci_get_drvdata(par
->pci_dev
);
94 mutex_lock(&info
->bl_mutex
);
95 ret
= __nvidia_bl_update_status(bd
);
96 mutex_unlock(&info
->bl_mutex
);
101 static int nvidia_bl_get_brightness(struct backlight_device
*bd
)
103 return bd
->props
->brightness
;
106 static struct backlight_properties nvidia_bl_data
= {
107 .get_brightness
= nvidia_bl_get_brightness
,
108 .update_status
= nvidia_bl_update_status
,
109 .max_brightness
= (FB_BACKLIGHT_LEVELS
- 1),
112 void nvidia_bl_set_power(struct fb_info
*info
, int power
)
114 mutex_lock(&info
->bl_mutex
);
117 info
->bl_dev
->props
->power
= power
;
118 __nvidia_bl_update_status(info
->bl_dev
);
121 mutex_unlock(&info
->bl_mutex
);
124 void nvidia_bl_init(struct nvidia_par
*par
)
126 struct fb_info
*info
= pci_get_drvdata(par
->pci_dev
);
127 struct backlight_device
*bd
;
133 #ifdef CONFIG_PMAC_BACKLIGHT
134 if (!machine_is(powermac
) ||
135 !pmac_has_backlight_type("mnca"))
139 snprintf(name
, sizeof(name
), "nvidiabl%d", info
->node
);
141 bd
= backlight_device_register(name
, info
->dev
, par
, &nvidia_bl_data
);
144 printk(KERN_WARNING
"nvidia: Backlight registration failed\n");
148 mutex_lock(&info
->bl_mutex
);
150 fb_bl_default_curve(info
, 0,
151 0x158 * FB_BACKLIGHT_MAX
/ MAX_LEVEL
,
152 0x534 * FB_BACKLIGHT_MAX
/ MAX_LEVEL
);
153 mutex_unlock(&info
->bl_mutex
);
155 bd
->props
->brightness
= nvidia_bl_data
.max_brightness
;
156 bd
->props
->power
= FB_BLANK_UNBLANK
;
157 backlight_update_status(bd
);
159 #ifdef CONFIG_PMAC_BACKLIGHT
160 mutex_lock(&pmac_backlight_mutex
);
163 mutex_unlock(&pmac_backlight_mutex
);
166 printk("nvidia: Backlight initialized (%s)\n", name
);
174 void nvidia_bl_exit(struct nvidia_par
*par
)
176 struct fb_info
*info
= pci_get_drvdata(par
->pci_dev
);
178 #ifdef CONFIG_PMAC_BACKLIGHT
179 mutex_lock(&pmac_backlight_mutex
);
182 mutex_lock(&info
->bl_mutex
);
184 #ifdef CONFIG_PMAC_BACKLIGHT
185 if (pmac_backlight
== info
->bl_dev
)
186 pmac_backlight
= NULL
;
189 backlight_device_unregister(info
->bl_dev
);
191 printk("nvidia: Backlight unloaded\n");
193 mutex_unlock(&info
->bl_mutex
);
195 #ifdef CONFIG_PMAC_BACKLIGHT
196 mutex_unlock(&pmac_backlight_mutex
);