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 #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 23 struct radeon_bl_privdata { 24 struct radeonfb_info *rinfo; 25 uint8_t negative; 26 }; 27 28 static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata, 29 int level) 30 { 31 int rlevel; 32 33 /* Get and convert the value */ 34 /* No locking of bl_curve since we read a single value */ 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 49 static 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 /* We turn off the LCD completely instead of just dimming the 60 * backlight. This provides some greater power saving and the display 61 * is useless without backlight anyway. 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 /* Asic bug, when turning off LVDS_ON, we have to make sure 100 RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off 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 } 125 126 static const struct backlight_ops radeon_bl_data = { 127 .update_status = radeon_bl_update_status, 128 }; 129 130 void 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 /* 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.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; 195 196 error: 197 kfree(pdata); 198 return; 199 } 200 201 void 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