Commit | Line | Data |
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5474c120 MH |
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 | ||
5474c120 MH |
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 | { | |
5474c120 MH |
30 | int rlevel; |
31 | ||
5474c120 | 32 | /* Get and convert the value */ |
37ce69a5 | 33 | /* No locking of bl_curve since we read a single value */ |
5474c120 MH |
34 | rlevel = pdata->rinfo->info->bl_curve[level] * |
35 | FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL; | |
36 | ||
5474c120 MH |
37 | if (rlevel < 0) |
38 | rlevel = 0; | |
39 | else if (rlevel > MAX_RADEON_LEVEL) | |
40 | rlevel = MAX_RADEON_LEVEL; | |
41 | ||
cab267c6 MH |
42 | if (pdata->negative) |
43 | rlevel = MAX_RADEON_LEVEL - rlevel; | |
44 | ||
5474c120 MH |
45 | return rlevel; |
46 | } | |
47 | ||
48 | static int radeon_bl_update_status(struct backlight_device *bd) | |
49 | { | |
655bfd7a | 50 | struct radeon_bl_privdata *pdata = bl_get_data(bd); |
5474c120 MH |
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 | */ | |
599a52d1 RP |
62 | if (bd->props.power != FB_BLANK_UNBLANK || |
63 | bd->props.fb_blank != FB_BLANK_UNBLANK) | |
5474c120 MH |
64 | level = 0; |
65 | else | |
599a52d1 | 66 | level = bd->props.brightness; |
5474c120 MH |
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 | { | |
599a52d1 | 127 | return bd->props.brightness; |
5474c120 MH |
128 | } |
129 | ||
599a52d1 | 130 | static struct backlight_ops radeon_bl_data = { |
5474c120 MH |
131 | .get_brightness = radeon_bl_get_brightness, |
132 | .update_status = radeon_bl_update_status, | |
5474c120 MH |
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 | ||
a8274d57 | 158 | bd = backlight_device_register(name, rinfo->info->dev, pdata, &radeon_bl_data); |
5474c120 MH |
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 | machine_is_compatible("PowerBook4,3") || | |
179 | machine_is_compatible("PowerBook6,3") || | |
180 | machine_is_compatible("PowerBook6,5"); | |
181 | #endif | |
182 | ||
5474c120 MH |
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); | |
5474c120 | 187 | |
599a52d1 RP |
188 | bd->props.max_brightness = FB_BACKLIGHT_LEVELS - 1; |
189 | bd->props.brightness = bd->props.max_brightness; | |
190 | bd->props.power = FB_BLANK_UNBLANK; | |
28ee086d | 191 | backlight_update_status(bd); |
5474c120 | 192 | |
5474c120 MH |
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 | { | |
37ce69a5 | 204 | struct backlight_device *bd = rinfo->info->bl_dev; |
5474c120 | 205 | |
37ce69a5 | 206 | if (bd) { |
5474c120 MH |
207 | struct radeon_bl_privdata *pdata; |
208 | ||
655bfd7a | 209 | pdata = bl_get_data(bd); |
37ce69a5 | 210 | backlight_device_unregister(bd); |
5474c120 MH |
211 | kfree(pdata); |
212 | rinfo->info->bl_dev = NULL; | |
213 | ||
214 | printk("radeonfb: Backlight unloaded\n"); | |
215 | } | |
5474c120 | 216 | } |