bb7ca747f8
There may be multiple ways of controlling the backlight on a given machine. Allow drivers to expose the type of interface they are providing, making it possible for userspace to make appropriate policy decisions. Signed-off-by: Matthew Garrett <mjg@redhat.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: David Airlie <airlied@linux.ie> Cc: Alex Deucher <alexdeucher@gmail.com> Cc: Ben Skeggs <bskeggs@redhat.com> Cc: Zhang Rui <rui.zhang@intel.com> Cc: Len Brown <lenb@kernel.org> Cc: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
/*
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* Backlight code for nVidia based graphic cards
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*
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* Copyright 2004 Antonino Daplas <adaplas@pol.net>
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* Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/backlight.h>
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#include <linux/fb.h>
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#include <linux/pci.h>
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#ifdef CONFIG_PMAC_BACKLIGHT
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#include <asm/backlight.h>
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#endif
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#include "nv_local.h"
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#include "nv_type.h"
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#include "nv_proto.h"
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/* We do not have any information about which values are allowed, thus
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* we used safe values.
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*/
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#define MIN_LEVEL 0x158
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#define MAX_LEVEL 0x534
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#define LEVEL_STEP ((MAX_LEVEL - MIN_LEVEL) / FB_BACKLIGHT_MAX)
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static int nvidia_bl_get_level_brightness(struct nvidia_par *par,
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int level)
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{
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struct fb_info *info = pci_get_drvdata(par->pci_dev);
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int nlevel;
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/* Get and convert the value */
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/* No locking of bl_curve since we read a single value */
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nlevel = MIN_LEVEL + info->bl_curve[level] * LEVEL_STEP;
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if (nlevel < 0)
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nlevel = 0;
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else if (nlevel < MIN_LEVEL)
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nlevel = MIN_LEVEL;
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else if (nlevel > MAX_LEVEL)
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nlevel = MAX_LEVEL;
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return nlevel;
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}
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static int nvidia_bl_update_status(struct backlight_device *bd)
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{
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struct nvidia_par *par = bl_get_data(bd);
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u32 tmp_pcrt, tmp_pmc, fpcontrol;
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int level;
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if (!par->FlatPanel)
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return 0;
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if (bd->props.power != FB_BLANK_UNBLANK ||
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bd->props.fb_blank != FB_BLANK_UNBLANK)
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level = 0;
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else
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level = bd->props.brightness;
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tmp_pmc = NV_RD32(par->PMC, 0x10F0) & 0x0000FFFF;
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tmp_pcrt = NV_RD32(par->PCRTC0, 0x081C) & 0xFFFFFFFC;
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fpcontrol = NV_RD32(par->PRAMDAC, 0x0848) & 0xCFFFFFCC;
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if (level > 0) {
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tmp_pcrt |= 0x1;
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tmp_pmc |= (1 << 31); /* backlight bit */
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tmp_pmc |= nvidia_bl_get_level_brightness(par, level) << 16;
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fpcontrol |= par->fpSyncs;
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} else
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fpcontrol |= 0x20000022;
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NV_WR32(par->PCRTC0, 0x081C, tmp_pcrt);
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NV_WR32(par->PMC, 0x10F0, tmp_pmc);
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NV_WR32(par->PRAMDAC, 0x848, fpcontrol);
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return 0;
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}
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static int nvidia_bl_get_brightness(struct backlight_device *bd)
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{
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return bd->props.brightness;
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}
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static const struct backlight_ops nvidia_bl_ops = {
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.get_brightness = nvidia_bl_get_brightness,
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.update_status = nvidia_bl_update_status,
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};
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void nvidia_bl_init(struct nvidia_par *par)
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{
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struct backlight_properties props;
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struct fb_info *info = pci_get_drvdata(par->pci_dev);
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struct backlight_device *bd;
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char name[12];
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if (!par->FlatPanel)
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return;
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#ifdef CONFIG_PMAC_BACKLIGHT
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if (!machine_is(powermac) ||
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!pmac_has_backlight_type("mnca"))
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return;
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#endif
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snprintf(name, sizeof(name), "nvidiabl%d", info->node);
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memset(&props, 0, sizeof(struct backlight_properties));
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props.type = BACKLIGHT_RAW;
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props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
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bd = backlight_device_register(name, info->dev, par, &nvidia_bl_ops,
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&props);
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if (IS_ERR(bd)) {
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info->bl_dev = NULL;
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printk(KERN_WARNING "nvidia: Backlight registration failed\n");
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goto error;
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}
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info->bl_dev = bd;
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fb_bl_default_curve(info, 0,
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0x158 * FB_BACKLIGHT_MAX / MAX_LEVEL,
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0x534 * FB_BACKLIGHT_MAX / MAX_LEVEL);
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bd->props.brightness = bd->props.max_brightness;
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bd->props.power = FB_BLANK_UNBLANK;
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backlight_update_status(bd);
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printk("nvidia: Backlight initialized (%s)\n", name);
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return;
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error:
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return;
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}
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void nvidia_bl_exit(struct nvidia_par *par)
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{
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struct fb_info *info = pci_get_drvdata(par->pci_dev);
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struct backlight_device *bd = info->bl_dev;
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backlight_device_unregister(bd);
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printk("nvidia: Backlight unloaded\n");
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}
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