fa1198c4ccc5d0041072b5ca95913134e3531ee3
[linux-2.6.git] / drivers / video / aty / radeon_backlight.c
1 /*
2  * Backlight code for ATI Radeon based graphic cards
3  *
4  * Copyright (c) 2000 Ani Joshi <ajoshi@kernel.crashing.org>
5  * Copyright (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org>
6  * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11  */
12
13 #include "radeonfb.h"
14 #include <linux/backlight.h>
15
16 #ifdef CONFIG_PMAC_BACKLIGHT
17 #include <asm/backlight.h>
18 #endif
19
20 #define MAX_RADEON_LEVEL 0xFF
21
22 struct radeon_bl_privdata {
23         struct radeonfb_info *rinfo;
24         uint8_t negative;
25 };
26
27 static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata,
28                 int level)
29 {
30         int rlevel;
31
32         /* Get and convert the value */
33         /* No locking of bl_curve since we read a single value */
34         rlevel = pdata->rinfo->info->bl_curve[level] *
35                  FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;
36
37         if (rlevel < 0)
38                 rlevel = 0;
39         else if (rlevel > MAX_RADEON_LEVEL)
40                 rlevel = MAX_RADEON_LEVEL;
41
42         if (pdata->negative)
43                 rlevel = MAX_RADEON_LEVEL - rlevel;
44
45         return rlevel;
46 }
47
48 static int radeon_bl_update_status(struct backlight_device *bd)
49 {
50         struct radeon_bl_privdata *pdata = bl_get_data(bd);
51         struct radeonfb_info *rinfo = pdata->rinfo;
52         u32 lvds_gen_cntl, tmpPixclksCntl;
53         int level;
54
55         if (rinfo->mon1_type != MT_LCD)
56                 return 0;
57
58         /* We turn off the LCD completely instead of just dimming the
59          * backlight. This provides some greater power saving and the display
60          * is useless without backlight anyway.
61          */
62         if (bd->props.power != FB_BLANK_UNBLANK ||
63             bd->props.fb_blank != FB_BLANK_UNBLANK)
64                 level = 0;
65         else
66                 level = bd->props.brightness;
67
68         del_timer_sync(&rinfo->lvds_timer);
69         radeon_engine_idle();
70
71         lvds_gen_cntl = INREG(LVDS_GEN_CNTL);
72         if (level > 0) {
73                 lvds_gen_cntl &= ~LVDS_DISPLAY_DIS;
74                 if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) {
75                         lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON);
76                         lvds_gen_cntl |= LVDS_BLON | LVDS_EN;
77                         OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
78                         lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
79                         lvds_gen_cntl |=
80                                 (radeon_bl_get_level_brightness(pdata, level) <<
81                                  LVDS_BL_MOD_LEVEL_SHIFT);
82                         lvds_gen_cntl |= LVDS_ON;
83                         lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN);
84                         rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
85                         mod_timer(&rinfo->lvds_timer,
86                                   jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
87                 } else {
88                         lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
89                         lvds_gen_cntl |=
90                                 (radeon_bl_get_level_brightness(pdata, level) <<
91                                  LVDS_BL_MOD_LEVEL_SHIFT);
92                         OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
93                 }
94                 rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
95                 rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl
96                         & LVDS_STATE_MASK;
97         } else {
98                 /* Asic bug, when turning off LVDS_ON, we have to make sure
99                    RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off
100                 */
101                 tmpPixclksCntl = INPLL(PIXCLKS_CNTL);
102                 if (rinfo->is_mobility || rinfo->is_IGP)
103                         OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb);
104                 lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN);
105                 lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) <<
106                                   LVDS_BL_MOD_LEVEL_SHIFT);
107                 lvds_gen_cntl |= LVDS_DISPLAY_DIS;
108                 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
109                 udelay(100);
110                 lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN);
111                 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
112                 lvds_gen_cntl &= ~(LVDS_DIGON);
113                 rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
114                 mod_timer(&rinfo->lvds_timer,
115                           jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
116                 if (rinfo->is_mobility || rinfo->is_IGP)
117                         OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl);
118         }
119         rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
120         rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK);
121
122         return 0;
123 }
124
125 static int radeon_bl_get_brightness(struct backlight_device *bd)
126 {
127         return bd->props.brightness;
128 }
129
130 static struct backlight_ops radeon_bl_data = {
131         .get_brightness = radeon_bl_get_brightness,
132         .update_status  = radeon_bl_update_status,
133 };
134
135 void radeonfb_bl_init(struct radeonfb_info *rinfo)
136 {
137         struct backlight_device *bd;
138         struct radeon_bl_privdata *pdata;
139         char name[12];
140
141         if (rinfo->mon1_type != MT_LCD)
142                 return;
143
144 #ifdef CONFIG_PMAC_BACKLIGHT
145         if (!pmac_has_backlight_type("ati") &&
146             !pmac_has_backlight_type("mnca"))
147                 return;
148 #endif
149
150         pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL);
151         if (!pdata) {
152                 printk("radeonfb: Memory allocation failed\n");
153                 goto error;
154         }
155
156         snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node);
157
158         bd = backlight_device_register(name, rinfo->info->dev, pdata, &radeon_bl_data);
159         if (IS_ERR(bd)) {
160                 rinfo->info->bl_dev = NULL;
161                 printk("radeonfb: Backlight registration failed\n");
162                 goto error;
163         }
164
165         pdata->rinfo = rinfo;
166
167         /* Pardon me for that hack... maybe some day we can figure out in what
168          * direction backlight should work on a given panel?
169          */
170         pdata->negative =
171                 (rinfo->family != CHIP_FAMILY_RV200 &&
172                  rinfo->family != CHIP_FAMILY_RV250 &&
173                  rinfo->family != CHIP_FAMILY_RV280 &&
174                  rinfo->family != CHIP_FAMILY_RV350);
175
176 #ifdef CONFIG_PMAC_BACKLIGHT
177         pdata->negative = pdata->negative ||
178                 of_machine_is_compatible("PowerBook4,3") ||
179                 of_machine_is_compatible("PowerBook6,3") ||
180                 of_machine_is_compatible("PowerBook6,5");
181 #endif
182
183         rinfo->info->bl_dev = bd;
184         fb_bl_default_curve(rinfo->info, 0,
185                  63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL,
186                 217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL);
187
188         bd->props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
189         bd->props.brightness = bd->props.max_brightness;
190         bd->props.power = FB_BLANK_UNBLANK;
191         backlight_update_status(bd);
192
193         printk("radeonfb: Backlight initialized (%s)\n", name);
194
195         return;
196
197 error:
198         kfree(pdata);
199         return;
200 }
201
202 void radeonfb_bl_exit(struct radeonfb_info *rinfo)
203 {
204         struct backlight_device *bd = rinfo->info->bl_dev;
205
206         if (bd) {
207                 struct radeon_bl_privdata *pdata;
208
209                 pdata = bl_get_data(bd);
210                 backlight_device_unregister(bd);
211                 kfree(pdata);
212                 rinfo->info->bl_dev = NULL;
213
214                 printk("radeonfb: Backlight unloaded\n");
215         }
216 }