1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Backlight code for ATI Radeon based graphic cards |
4 | * |
5 | * Copyright (c) 2000 Ani Joshi <ajoshi@kernel.crashing.org> |
6 | * Copyright (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org> |
7 | * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch> |
8 | */ |
9 | |
10 | #include "radeonfb.h" |
11 | #include <linux/backlight.h> |
12 | #include <linux/slab.h> |
13 | |
14 | #ifdef CONFIG_PMAC_BACKLIGHT |
15 | #include <asm/backlight.h> |
16 | #endif |
17 | |
18 | #define MAX_RADEON_LEVEL 0xFF |
19 | |
20 | struct radeon_bl_privdata { |
21 | struct radeonfb_info *rinfo; |
22 | uint8_t negative; |
23 | }; |
24 | |
25 | static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata, |
26 | int level) |
27 | { |
28 | int rlevel; |
29 | |
30 | /* Get and convert the value */ |
31 | /* No locking of bl_curve since we read a single value */ |
32 | rlevel = pdata->rinfo->info->bl_curve[level] * |
33 | FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL; |
34 | |
35 | if (rlevel < 0) |
36 | rlevel = 0; |
37 | else if (rlevel > MAX_RADEON_LEVEL) |
38 | rlevel = MAX_RADEON_LEVEL; |
39 | |
40 | if (pdata->negative) |
41 | rlevel = MAX_RADEON_LEVEL - rlevel; |
42 | |
43 | return rlevel; |
44 | } |
45 | |
46 | static int radeon_bl_update_status(struct backlight_device *bd) |
47 | { |
48 | struct radeon_bl_privdata *pdata = bl_get_data(bl_dev: bd); |
49 | struct radeonfb_info *rinfo = pdata->rinfo; |
50 | u32 lvds_gen_cntl, tmpPixclksCntl; |
51 | int level; |
52 | |
53 | if (rinfo->mon1_type != MT_LCD) |
54 | return 0; |
55 | |
56 | /* We turn off the LCD completely instead of just dimming the |
57 | * backlight. This provides some greater power saving and the display |
58 | * is useless without backlight anyway. |
59 | */ |
60 | level = backlight_get_brightness(bd); |
61 | |
62 | del_timer_sync(timer: &rinfo->lvds_timer); |
63 | radeon_engine_idle(); |
64 | |
65 | lvds_gen_cntl = INREG(LVDS_GEN_CNTL); |
66 | if (level > 0) { |
67 | lvds_gen_cntl &= ~LVDS_DISPLAY_DIS; |
68 | if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) { |
69 | lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON); |
70 | lvds_gen_cntl |= LVDS_BLON | LVDS_EN; |
71 | OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); |
72 | lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK; |
73 | lvds_gen_cntl |= |
74 | (radeon_bl_get_level_brightness(pdata, level) << |
75 | LVDS_BL_MOD_LEVEL_SHIFT); |
76 | lvds_gen_cntl |= LVDS_ON; |
77 | lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN); |
78 | rinfo->pending_lvds_gen_cntl = lvds_gen_cntl; |
79 | mod_timer(timer: &rinfo->lvds_timer, |
80 | expires: jiffies + msecs_to_jiffies(m: rinfo->panel_info.pwr_delay)); |
81 | } else { |
82 | lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK; |
83 | lvds_gen_cntl |= |
84 | (radeon_bl_get_level_brightness(pdata, level) << |
85 | LVDS_BL_MOD_LEVEL_SHIFT); |
86 | OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); |
87 | } |
88 | rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK; |
89 | rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl |
90 | & LVDS_STATE_MASK; |
91 | } else { |
92 | /* Asic bug, when turning off LVDS_ON, we have to make sure |
93 | RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off |
94 | */ |
95 | tmpPixclksCntl = INPLL(PIXCLKS_CNTL); |
96 | if (rinfo->is_mobility || rinfo->is_IGP) |
97 | OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb); |
98 | lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN); |
99 | lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, level: 0) << |
100 | LVDS_BL_MOD_LEVEL_SHIFT); |
101 | lvds_gen_cntl |= LVDS_DISPLAY_DIS; |
102 | OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); |
103 | udelay(100); |
104 | lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN); |
105 | OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); |
106 | lvds_gen_cntl &= ~(LVDS_DIGON); |
107 | rinfo->pending_lvds_gen_cntl = lvds_gen_cntl; |
108 | mod_timer(timer: &rinfo->lvds_timer, |
109 | expires: jiffies + msecs_to_jiffies(m: rinfo->panel_info.pwr_delay)); |
110 | if (rinfo->is_mobility || rinfo->is_IGP) |
111 | OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl); |
112 | } |
113 | rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK; |
114 | rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK); |
115 | |
116 | return 0; |
117 | } |
118 | |
119 | static const struct backlight_ops radeon_bl_data = { |
120 | .update_status = radeon_bl_update_status, |
121 | }; |
122 | |
123 | void radeonfb_bl_init(struct radeonfb_info *rinfo) |
124 | { |
125 | struct backlight_properties props; |
126 | struct backlight_device *bd; |
127 | struct radeon_bl_privdata *pdata; |
128 | char name[12]; |
129 | |
130 | if (rinfo->mon1_type != MT_LCD) |
131 | return; |
132 | |
133 | #ifdef CONFIG_PMAC_BACKLIGHT |
134 | if (!pmac_has_backlight_type("ati" ) && |
135 | !pmac_has_backlight_type("mnca" )) |
136 | return; |
137 | #endif |
138 | |
139 | pdata = kmalloc(size: sizeof(struct radeon_bl_privdata), GFP_KERNEL); |
140 | if (!pdata) { |
141 | printk("radeonfb: Memory allocation failed\n" ); |
142 | goto error; |
143 | } |
144 | |
145 | snprintf(buf: name, size: sizeof(name), fmt: "radeonbl%d" , rinfo->info->node); |
146 | |
147 | memset(&props, 0, sizeof(struct backlight_properties)); |
148 | props.type = BACKLIGHT_RAW; |
149 | props.max_brightness = FB_BACKLIGHT_LEVELS - 1; |
150 | bd = backlight_device_register(name, dev: rinfo->info->device, devdata: pdata, |
151 | ops: &radeon_bl_data, props: &props); |
152 | if (IS_ERR(ptr: bd)) { |
153 | rinfo->info->bl_dev = NULL; |
154 | printk("radeonfb: Backlight registration failed\n" ); |
155 | goto error; |
156 | } |
157 | |
158 | pdata->rinfo = rinfo; |
159 | |
160 | /* Pardon me for that hack... maybe some day we can figure out in what |
161 | * direction backlight should work on a given panel? |
162 | */ |
163 | pdata->negative = |
164 | (rinfo->family != CHIP_FAMILY_RV200 && |
165 | rinfo->family != CHIP_FAMILY_RV250 && |
166 | rinfo->family != CHIP_FAMILY_RV280 && |
167 | rinfo->family != CHIP_FAMILY_RV350); |
168 | |
169 | #ifdef CONFIG_PMAC_BACKLIGHT |
170 | pdata->negative = pdata->negative || |
171 | of_machine_is_compatible("PowerBook4,3" ) || |
172 | of_machine_is_compatible("PowerBook6,3" ) || |
173 | of_machine_is_compatible("PowerBook6,5" ); |
174 | #endif |
175 | |
176 | rinfo->info->bl_dev = bd; |
177 | fb_bl_default_curve(fb_info: rinfo->info, off: 0, |
178 | min: 63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL, |
179 | max: 217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL); |
180 | |
181 | bd->props.brightness = bd->props.max_brightness; |
182 | bd->props.power = FB_BLANK_UNBLANK; |
183 | backlight_update_status(bd); |
184 | |
185 | printk("radeonfb: Backlight initialized (%s)\n" , name); |
186 | |
187 | return; |
188 | |
189 | error: |
190 | kfree(objp: pdata); |
191 | return; |
192 | } |
193 | |
194 | void radeonfb_bl_exit(struct radeonfb_info *rinfo) |
195 | { |
196 | struct backlight_device *bd = rinfo->info->bl_dev; |
197 | |
198 | if (bd) { |
199 | struct radeon_bl_privdata *pdata; |
200 | |
201 | pdata = bl_get_data(bl_dev: bd); |
202 | backlight_device_unregister(bd); |
203 | kfree(objp: pdata); |
204 | rinfo->info->bl_dev = NULL; |
205 | |
206 | printk("radeonfb: Backlight unloaded\n" ); |
207 | } |
208 | } |
209 | |