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13#include "radeonfb.h"
14#include <linux/backlight.h>
15#include <linux/slab.h>
16
17#ifdef CONFIG_PMAC_BACKLIGHT
18#include <asm/backlight.h>
19#endif
20
21#define MAX_RADEON_LEVEL 0xFF
22
23struct radeon_bl_privdata {
24 struct radeonfb_info *rinfo;
25 uint8_t negative;
26};
27
28static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata,
29 int level)
30{
31 int rlevel;
32
33
34
35 rlevel = pdata->rinfo->info->bl_curve[level] *
36 FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;
37
38 if (rlevel < 0)
39 rlevel = 0;
40 else if (rlevel > MAX_RADEON_LEVEL)
41 rlevel = MAX_RADEON_LEVEL;
42
43 if (pdata->negative)
44 rlevel = MAX_RADEON_LEVEL - rlevel;
45
46 return rlevel;
47}
48
49static int radeon_bl_update_status(struct backlight_device *bd)
50{
51 struct radeon_bl_privdata *pdata = bl_get_data(bd);
52 struct radeonfb_info *rinfo = pdata->rinfo;
53 u32 lvds_gen_cntl, tmpPixclksCntl;
54 int level;
55
56 if (rinfo->mon1_type != MT_LCD)
57 return 0;
58
59
60
61
62
63 if (bd->props.power != FB_BLANK_UNBLANK ||
64 bd->props.fb_blank != FB_BLANK_UNBLANK)
65 level = 0;
66 else
67 level = bd->props.brightness;
68
69 del_timer_sync(&rinfo->lvds_timer);
70 radeon_engine_idle();
71
72 lvds_gen_cntl = INREG(LVDS_GEN_CNTL);
73 if (level > 0) {
74 lvds_gen_cntl &= ~LVDS_DISPLAY_DIS;
75 if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) {
76 lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON);
77 lvds_gen_cntl |= LVDS_BLON | LVDS_EN;
78 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
79 lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
80 lvds_gen_cntl |=
81 (radeon_bl_get_level_brightness(pdata, level) <<
82 LVDS_BL_MOD_LEVEL_SHIFT);
83 lvds_gen_cntl |= LVDS_ON;
84 lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN);
85 rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
86 mod_timer(&rinfo->lvds_timer,
87 jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
88 } else {
89 lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
90 lvds_gen_cntl |=
91 (radeon_bl_get_level_brightness(pdata, level) <<
92 LVDS_BL_MOD_LEVEL_SHIFT);
93 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
94 }
95 rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
96 rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl
97 & LVDS_STATE_MASK;
98 } else {
99
100
101
102 tmpPixclksCntl = INPLL(PIXCLKS_CNTL);
103 if (rinfo->is_mobility || rinfo->is_IGP)
104 OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb);
105 lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN);
106 lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) <<
107 LVDS_BL_MOD_LEVEL_SHIFT);
108 lvds_gen_cntl |= LVDS_DISPLAY_DIS;
109 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
110 udelay(100);
111 lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN);
112 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
113 lvds_gen_cntl &= ~(LVDS_DIGON);
114 rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
115 mod_timer(&rinfo->lvds_timer,
116 jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
117 if (rinfo->is_mobility || rinfo->is_IGP)
118 OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl);
119 }
120 rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
121 rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK);
122
123 return 0;
124}
125
126static const struct backlight_ops radeon_bl_data = {
127 .update_status = radeon_bl_update_status,
128};
129
130void radeonfb_bl_init(struct radeonfb_info *rinfo)
131{
132 struct backlight_properties props;
133 struct backlight_device *bd;
134 struct radeon_bl_privdata *pdata;
135 char name[12];
136
137 if (rinfo->mon1_type != MT_LCD)
138 return;
139
140#ifdef CONFIG_PMAC_BACKLIGHT
141 if (!pmac_has_backlight_type("ati") &&
142 !pmac_has_backlight_type("mnca"))
143 return;
144#endif
145
146 pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL);
147 if (!pdata) {
148 printk("radeonfb: Memory allocation failed\n");
149 goto error;
150 }
151
152 snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node);
153
154 memset(&props, 0, sizeof(struct backlight_properties));
155 props.type = BACKLIGHT_RAW;
156 props.max_brightness = FB_BACKLIGHT_LEVELS - 1;
157 bd = backlight_device_register(name, rinfo->info->dev, pdata,
158 &radeon_bl_data, &props);
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
168
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.brightness = bd->props.max_brightness;
189 bd->props.power = FB_BLANK_UNBLANK;
190 backlight_update_status(bd);
191
192 printk("radeonfb: Backlight initialized (%s)\n", name);
193
194 return;
195
196error:
197 kfree(pdata);
198 return;
199}
200
201void radeonfb_bl_exit(struct radeonfb_info *rinfo)
202{
203 struct backlight_device *bd = rinfo->info->bl_dev;
204
205 if (bd) {
206 struct radeon_bl_privdata *pdata;
207
208 pdata = bl_get_data(bd);
209 backlight_device_unregister(bd);
210 kfree(pdata);
211 rinfo->info->bl_dev = NULL;
212
213 printk("radeonfb: Backlight unloaded\n");
214 }
215}
216