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599a52d126
Per device data such as brightness belongs to the indivdual device and should therefore be separate from the the backlight operation function pointers. This patch splits the two types of data and allows simplifcation of some code. Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
142 lines
3.4 KiB
C
142 lines
3.4 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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#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 struct backlight_properties nvidia_bl_data;
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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 = class_get_devdata(&bd->class_dev);
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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 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 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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bd = backlight_device_register(name, info->dev, par, &nvidia_bl_ops);
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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.max_brightness = FB_BACKLIGHT_LEVELS - 1;
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bd->props.brightness = nvidia_bl_data.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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