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/drivers/video/nvidia/nv_backlight.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 148 lines | 104 code | 29 blank | 15 comment | 13 complexity | b796a676a43b512171dc66ded7c7636b MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
  1/*
  2 * Backlight code for nVidia based graphic cards
  3 *
  4 * Copyright 2004 Antonino Daplas <adaplas@pol.net>
  5 * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
  6 *
  7 * This program is free software; you can redistribute it and/or modify
  8 * it under the terms of the GNU General Public License version 2 as
  9 * published by the Free Software Foundation.
 10 */
 11
 12#include <linux/backlight.h>
 13#include <linux/fb.h>
 14#include <linux/pci.h>
 15
 16#ifdef CONFIG_PMAC_BACKLIGHT
 17#include <asm/backlight.h>
 18#endif
 19
 20#include "nv_local.h"
 21#include "nv_type.h"
 22#include "nv_proto.h"
 23
 24/* We do not have any information about which values are allowed, thus
 25 * we used safe values.
 26 */
 27#define MIN_LEVEL 0x158
 28#define MAX_LEVEL 0x534
 29#define LEVEL_STEP ((MAX_LEVEL - MIN_LEVEL) / FB_BACKLIGHT_MAX)
 30
 31static int nvidia_bl_get_level_brightness(struct nvidia_par *par,
 32		int level)
 33{
 34	struct fb_info *info = pci_get_drvdata(par->pci_dev);
 35	int nlevel;
 36
 37	/* Get and convert the value */
 38	/* No locking of bl_curve since we read a single value */
 39	nlevel = MIN_LEVEL + info->bl_curve[level] * LEVEL_STEP;
 40
 41	if (nlevel < 0)
 42		nlevel = 0;
 43	else if (nlevel < MIN_LEVEL)
 44		nlevel = MIN_LEVEL;
 45	else if (nlevel > MAX_LEVEL)
 46		nlevel = MAX_LEVEL;
 47
 48	return nlevel;
 49}
 50
 51static int nvidia_bl_update_status(struct backlight_device *bd)
 52{
 53	struct nvidia_par *par = bl_get_data(bd);
 54	u32 tmp_pcrt, tmp_pmc, fpcontrol;
 55	int level;
 56
 57	if (!par->FlatPanel)
 58		return 0;
 59
 60	if (bd->props.power != FB_BLANK_UNBLANK ||
 61	    bd->props.fb_blank != FB_BLANK_UNBLANK)
 62		level = 0;
 63	else
 64		level = bd->props.brightness;
 65
 66	tmp_pmc = NV_RD32(par->PMC, 0x10F0) & 0x0000FFFF;
 67	tmp_pcrt = NV_RD32(par->PCRTC0, 0x081C) & 0xFFFFFFFC;
 68	fpcontrol = NV_RD32(par->PRAMDAC, 0x0848) & 0xCFFFFFCC;
 69
 70	if (level > 0) {
 71		tmp_pcrt |= 0x1;
 72		tmp_pmc |= (1 << 31); /* backlight bit */
 73		tmp_pmc |= nvidia_bl_get_level_brightness(par, level) << 16;
 74		fpcontrol |= par->fpSyncs;
 75	} else
 76		fpcontrol |= 0x20000022;
 77
 78	NV_WR32(par->PCRTC0, 0x081C, tmp_pcrt);
 79	NV_WR32(par->PMC, 0x10F0, tmp_pmc);
 80	NV_WR32(par->PRAMDAC, 0x848, fpcontrol);
 81
 82	return 0;
 83}
 84
 85static int nvidia_bl_get_brightness(struct backlight_device *bd)
 86{
 87	return bd->props.brightness;
 88}
 89
 90static const struct backlight_ops nvidia_bl_ops = {
 91	.get_brightness = nvidia_bl_get_brightness,
 92	.update_status	= nvidia_bl_update_status,
 93};
 94
 95void nvidia_bl_init(struct nvidia_par *par)
 96{
 97	struct backlight_properties props;
 98	struct fb_info *info = pci_get_drvdata(par->pci_dev);
 99	struct backlight_device *bd;
100	char name[12];
101
102	if (!par->FlatPanel)
103		return;
104
105#ifdef CONFIG_PMAC_BACKLIGHT
106	if (!machine_is(powermac) ||
107	    !pmac_has_backlight_type("mnca"))
108		return;
109#endif
110
111	snprintf(name, sizeof(name), "nvidiabl%d", info->node);
112
113	memset(&props, 0, sizeof(struct backlight_properties));
114	props.type = BACKLIGHT_RAW;
115	props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
116	bd = backlight_device_register(name, info->dev, par, &nvidia_bl_ops,
117				       &props);
118	if (IS_ERR(bd)) {
119		info->bl_dev = NULL;
120		printk(KERN_WARNING "nvidia: Backlight registration failed\n");
121		goto error;
122	}
123
124	info->bl_dev = bd;
125	fb_bl_default_curve(info, 0,
126		0x158 * FB_BACKLIGHT_MAX / MAX_LEVEL,
127		0x534 * FB_BACKLIGHT_MAX / MAX_LEVEL);
128
129	bd->props.brightness = bd->props.max_brightness;
130	bd->props.power = FB_BLANK_UNBLANK;
131	backlight_update_status(bd);
132
133	printk("nvidia: Backlight initialized (%s)\n", name);
134
135	return;
136
137error:
138	return;
139}
140
141void nvidia_bl_exit(struct nvidia_par *par)
142{
143	struct fb_info *info = pci_get_drvdata(par->pci_dev);
144	struct backlight_device *bd = info->bl_dev;
145
146	backlight_device_unregister(bd);
147	printk("nvidia: Backlight unloaded\n");
148}