Release 4.7 drivers/video/fbdev/nvidia/nv_backlight.c
/*
* Backlight code for nVidia based graphic cards
*
* Copyright 2004 Antonino Daplas <adaplas@pol.net>
* Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/pci.h>
#ifdef CONFIG_PMAC_BACKLIGHT
#include <asm/backlight.h>
#endif
#include "nv_local.h"
#include "nv_type.h"
#include "nv_proto.h"
/* We do not have any information about which values are allowed, thus
* we used safe values.
*/
#define MIN_LEVEL 0x158
#define MAX_LEVEL 0x534
#define LEVEL_STEP ((MAX_LEVEL - MIN_LEVEL) / FB_BACKLIGHT_MAX)
static int nvidia_bl_get_level_brightness(struct nvidia_par *par,
int level)
{
struct fb_info *info = pci_get_drvdata(par->pci_dev);
int nlevel;
/* Get and convert the value */
/* No locking of bl_curve since we read a single value */
nlevel = MIN_LEVEL + info->bl_curve[level] * LEVEL_STEP;
if (nlevel < 0)
nlevel = 0;
else if (nlevel < MIN_LEVEL)
nlevel = MIN_LEVEL;
else if (nlevel > MAX_LEVEL)
nlevel = MAX_LEVEL;
return nlevel;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| michael hanselmann | michael hanselmann | 78 | 98.73% | 2 | 66.67% |
| richard purdie | richard purdie | 1 | 1.27% | 1 | 33.33% |
| Total | 79 | 100.00% | 3 | 100.00% |
static int nvidia_bl_update_status(struct backlight_device *bd)
{
struct nvidia_par *par = bl_get_data(bd);
u32 tmp_pcrt, tmp_pmc, fpcontrol;
int level;
if (!par->FlatPanel)
return 0;
if (bd->props.power != FB_BLANK_UNBLANK ||
bd->props.fb_blank != FB_BLANK_UNBLANK)
level = 0;
else
level = bd->props.brightness;
tmp_pmc = NV_RD32(par->PMC, 0x10F0) & 0x0000FFFF;
tmp_pcrt = NV_RD32(par->PCRTC0, 0x081C) & 0xFFFFFFFC;
fpcontrol = NV_RD32(par->PRAMDAC, 0x0848) & 0xCFFFFFCC;
if (level > 0) {
tmp_pcrt |= 0x1;
tmp_pmc |= (1 << 31); /* backlight bit */
tmp_pmc |= nvidia_bl_get_level_brightness(par, level) << 16;
fpcontrol |= par->fpSyncs;
} else
fpcontrol |= 0x20000022;
NV_WR32(par->PCRTC0, 0x081C, tmp_pcrt);
NV_WR32(par->PMC, 0x10F0, tmp_pmc);
NV_WR32(par->PRAMDAC, 0x848, fpcontrol);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| michael hanselmann | michael hanselmann | 185 | 97.37% | 1 | 25.00% |
| richard purdie | richard purdie | 5 | 2.63% | 3 | 75.00% |
| Total | 190 | 100.00% | 4 | 100.00% |
static const struct backlight_ops nvidia_bl_ops = {
.update_status = nvidia_bl_update_status,
};
void nvidia_bl_init(struct nvidia_par *par)
{
struct backlight_properties props;
struct fb_info *info = pci_get_drvdata(par->pci_dev);
struct backlight_device *bd;
char name[12];
if (!par->FlatPanel)
return;
#ifdef CONFIG_PMAC_BACKLIGHT
if (!machine_is(powermac) ||
!pmac_has_backlight_type("mnca"))
return;
#endif
snprintf(name, sizeof(name), "nvidiabl%d", info->node);
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_RAW;
props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
bd = backlight_device_register(name, info->dev, par, &nvidia_bl_ops,
&props);
if (IS_ERR(bd)) {
info->bl_dev = NULL;
printk(KERN_WARNING "nvidia: Backlight registration failed\n");
goto error;
}
info->bl_dev = bd;
fb_bl_default_curve(info, 0,
0x158 * FB_BACKLIGHT_MAX / MAX_LEVEL,
0x534 * FB_BACKLIGHT_MAX / MAX_LEVEL);
bd->props.brightness = bd->props.max_brightness;
bd->props.power = FB_BLANK_UNBLANK;
backlight_update_status(bd);
printk("nvidia: Backlight initialized (%s)\n", name);
return;
error:
return;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| michael hanselmann | michael hanselmann | 166 | 77.93% | 1 | 12.50% |
| matthew garrett | matthew garrett | 35 | 16.43% | 2 | 25.00% |
| richard purdie | richard purdie | 7 | 3.29% | 3 | 37.50% |
| james simmons | james simmons | 4 | 1.88% | 1 | 12.50% |
| benjamin herrenschmidt | benjamin herrenschmidt | 1 | 0.47% | 1 | 12.50% |
| Total | 213 | 100.00% | 8 | 100.00% |
void nvidia_bl_exit(struct nvidia_par *par)
{
struct fb_info *info = pci_get_drvdata(par->pci_dev);
struct backlight_device *bd = info->bl_dev;
backlight_device_unregister(bd);
printk("nvidia: Backlight unloaded\n");
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| michael hanselmann | michael hanselmann | 33 | 80.49% | 1 | 50.00% |
| richard purdie | richard purdie | 8 | 19.51% | 1 | 50.00% |
| Total | 41 | 100.00% | 2 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| michael hanselmann | michael hanselmann | 504 | 87.50% | 2 | 15.38% |
| matthew garrett | matthew garrett | 35 | 6.08% | 2 | 15.38% |
| richard purdie | richard purdie | 23 | 3.99% | 5 | 38.46% |
| dave jones | dave jones | 8 | 1.39% | 1 | 7.69% |
| james simmons | james simmons | 4 | 0.69% | 1 | 7.69% |
| benjamin herrenschmidt | benjamin herrenschmidt | 1 | 0.17% | 1 | 7.69% |
| lionel debroux | lionel debroux | 1 | 0.17% | 1 | 7.69% |
| Total | 576 | 100.00% | 13 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.