/* * 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; } 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; } static int nvidia_bl_get_brightness(struct backlight_device *bd) { return bd->props.brightness; } static struct backlight_ops nvidia_bl_ops = { .get_brightness = nvidia_bl_get_brightness, .update_status = nvidia_bl_update_status, }; void nvidia_bl_init(struct nvidia_par *par) { 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); bd = backlight_device_register(name, info->dev, par, &nvidia_bl_ops); 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.max_brightness = FB_BACKLIGHT_LEVELS - 1; 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; } 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"); }