summaryrefslogtreecommitdiffstats
path: root/drivers/video/aty/radeon_backlight.c
blob: 7de66b855d4e4e292d13182c40fafe0a44ceddac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
/*
 * Backlight code for ATI Radeon based graphic cards
 *
 * Copyright (c) 2000 Ani Joshi <ajoshi@kernel.crashing.org>
 * Copyright (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
 * 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 "radeonfb.h"
#include <linux/backlight.h>

#ifdef CONFIG_PMAC_BACKLIGHT
#include <asm/backlight.h>
#endif

#define MAX_RADEON_LEVEL 0xFF

static struct backlight_properties radeon_bl_data;

struct radeon_bl_privdata {
	struct radeonfb_info *rinfo;
	uint8_t negative;
};

static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata,
		int level)
{
	struct fb_info *info = pdata->rinfo->info;
	int rlevel;

	mutex_lock(&info->bl_mutex);

	/* Get and convert the value */
	rlevel = pdata->rinfo->info->bl_curve[level] *
		 FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;

	mutex_unlock(&info->bl_mutex);

	if (pdata->negative)
		rlevel = MAX_RADEON_LEVEL - rlevel;

	if (rlevel < 0)
		rlevel = 0;
	else if (rlevel > MAX_RADEON_LEVEL)
		rlevel = MAX_RADEON_LEVEL;

	return rlevel;
}

static int radeon_bl_update_status(struct backlight_device *bd)
{
	struct radeon_bl_privdata *pdata = class_get_devdata(&bd->class_dev);
	struct radeonfb_info *rinfo = pdata->rinfo;
	u32 lvds_gen_cntl, tmpPixclksCntl;
	int level;

	if (rinfo->mon1_type != MT_LCD)
		return 0;

	/* We turn off the LCD completely instead of just dimming the
	 * backlight. This provides some greater power saving and the display
	 * is useless without backlight anyway.
	 */
        if (bd->props->power != FB_BLANK_UNBLANK ||
	    bd->props->fb_blank != FB_BLANK_UNBLANK)
		level = 0;
	else
		level = bd->props->brightness;

	del_timer_sync(&rinfo->lvds_timer);
	radeon_engine_idle();

	lvds_gen_cntl = INREG(LVDS_GEN_CNTL);
	if (level > 0) {
		lvds_gen_cntl &= ~LVDS_DISPLAY_DIS;
		if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) {
			lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON);
			lvds_gen_cntl |= LVDS_BLON | LVDS_EN;
			OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
			lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
			lvds_gen_cntl |=
				(radeon_bl_get_level_brightness(pdata, level) <<
				 LVDS_BL_MOD_LEVEL_SHIFT);
			lvds_gen_cntl |= LVDS_ON;
			lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN);
			rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
			mod_timer(&rinfo->lvds_timer,
				  jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
		} else {
			lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
			lvds_gen_cntl |=
				(radeon_bl_get_level_brightness(pdata, level) <<
				 LVDS_BL_MOD_LEVEL_SHIFT);
			OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
		}
		rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
		rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl
			& LVDS_STATE_MASK;
	} else {
		/* Asic bug, when turning off LVDS_ON, we have to make sure
		   RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off
		*/
		tmpPixclksCntl = INPLL(PIXCLKS_CNTL);
		if (rinfo->is_mobility || rinfo->is_IGP)
			OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb);
		lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN);
		lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) <<
				  LVDS_BL_MOD_LEVEL_SHIFT);
		lvds_gen_cntl |= LVDS_DISPLAY_DIS;
		OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
		udelay(100);
		lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN);
		OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
		lvds_gen_cntl &= ~(LVDS_DIGON);
		rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
		mod_timer(&rinfo->lvds_timer,
			  jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
		if (rinfo->is_mobility || rinfo->is_IGP)
			OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl);
	}
	rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
	rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK);

	return 0;
}

static int radeon_bl_get_brightness(struct backlight_device *bd)
{
	return bd->props->brightness;
}

static struct backlight_properties radeon_bl_data = {
	.owner		= THIS_MODULE,
	.get_brightness = radeon_bl_get_brightness,
	.update_status	= radeon_bl_update_status,
	.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
};

void radeonfb_bl_init(struct radeonfb_info *rinfo)
{
	struct backlight_device *bd;
	struct radeon_bl_privdata *pdata;
	char name[12];

	if (rinfo->mon1_type != MT_LCD)
		return;

#ifdef CONFIG_PMAC_BACKLIGHT
	if (!pmac_has_backlight_type("ati") &&
	    !pmac_has_backlight_type("mnca"))
		return;
#endif

	pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL);
	if (!pdata) {
		printk("radeonfb: Memory allocation failed\n");
		goto error;
	}

	snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node);

	bd = backlight_device_register(name, pdata, &radeon_bl_data);
	if (IS_ERR(bd)) {
		rinfo->info->bl_dev = NULL;
		printk("radeonfb: Backlight registration failed\n");
		goto error;
	}

	pdata->rinfo = rinfo;

	/* Pardon me for that hack... maybe some day we can figure out in what
	 * direction backlight should work on a given panel?
	 */
	pdata->negative =
		(rinfo->family != CHIP_FAMILY_RV200 &&
		 rinfo->family != CHIP_FAMILY_RV250 &&
		 rinfo->family != CHIP_FAMILY_RV280 &&
		 rinfo->family != CHIP_FAMILY_RV350);

#ifdef CONFIG_PMAC_BACKLIGHT
	pdata->negative = pdata->negative ||
		machine_is_compatible("PowerBook4,3") ||
		machine_is_compatible("PowerBook6,3") ||
		machine_is_compatible("PowerBook6,5");
#endif

	mutex_lock(&rinfo->info->bl_mutex);
	rinfo->info->bl_dev = bd;
	fb_bl_default_curve(rinfo->info, 0,
		 63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL,
		217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL);
	mutex_unlock(&rinfo->info->bl_mutex);

	up(&bd->sem);
	bd->props->brightness = radeon_bl_data.max_brightness;
	bd->props->power = FB_BLANK_UNBLANK;
	bd->props->update_status(bd);
	down(&bd->sem);

#ifdef CONFIG_PMAC_BACKLIGHT
	mutex_lock(&pmac_backlight_mutex);
	if (!pmac_backlight)
		pmac_backlight = bd;
	mutex_unlock(&pmac_backlight_mutex);
#endif

	printk("radeonfb: Backlight initialized (%s)\n", name);

	return;

error:
	kfree(pdata);
	return;
}

void radeonfb_bl_exit(struct radeonfb_info *rinfo)
{
#ifdef CONFIG_PMAC_BACKLIGHT
	mutex_lock(&pmac_backlight_mutex);
#endif

	mutex_lock(&rinfo->info->bl_mutex);
	if (rinfo->info->bl_dev) {
		struct radeon_bl_privdata *pdata;

#ifdef CONFIG_PMAC_BACKLIGHT
		if (pmac_backlight == rinfo->info->bl_dev)
			pmac_backlight = NULL;
#endif

		pdata = class_get_devdata(&rinfo->info->bl_dev->class_dev);
		backlight_device_unregister(rinfo->info->bl_dev);
		kfree(pdata);
		rinfo->info->bl_dev = NULL;

		printk("radeonfb: Backlight unloaded\n");
	}
	mutex_unlock(&rinfo->info->bl_mutex);

#ifdef CONFIG_PMAC_BACKLIGHT
	mutex_unlock(&pmac_backlight_mutex);
#endif
}
OpenPOWER on IntegriCloud