// SPDX-License-Identifier: GPL-2.0-only/* * Backlight code for nVidia based graphic cards * * Copyright 2004 Antonino Daplas <adaplas@pol.net> * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch> */ #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 = backlight_get_brightness(bd); 	if (!par->FlatPanel)		return 0; 	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 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->device, 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 = BACKLIGHT_POWER_ON;	backlight_update_status(bd); 	printk("nvidia: Backlight initialized (%s)\n", name); 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");}