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 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 /* 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 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 /* 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 126static int radeon_bl_get_brightness(struct backlight_device *bd) 127{ 128 return bd->props.brightness; 129} 130 131static struct backlight_ops radeon_bl_data = { 132 .get_brightness = radeon_bl_get_brightness, 133 .update_status = radeon_bl_update_status, 134}; 135 136void radeonfb_bl_init(struct radeonfb_info *rinfo) 137{ 138 struct backlight_properties props; 139 struct backlight_device *bd; 140 struct radeon_bl_privdata *pdata; 141 char name[12]; 142 143 if (rinfo->mon1_type != MT_LCD) 144 return; 145 146#ifdef CONFIG_PMAC_BACKLIGHT 147 if (!pmac_has_backlight_type("ati") && 148 !pmac_has_backlight_type("mnca")) 149 return; 150#endif 151 152 pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL); 153 if (!pdata) { 154 printk("radeonfb: Memory allocation failed\n"); 155 goto error; 156 } 157 158 snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node); 159 160 memset(&props, 0, sizeof(struct backlight_properties)); 161 props.max_brightness = FB_BACKLIGHT_LEVELS - 1; 162 bd = backlight_device_register(name, rinfo->info->dev, pdata, 163 &radeon_bl_data, &props); 164 if (IS_ERR(bd)) { 165 rinfo->info->bl_dev = NULL; 166 printk("radeonfb: Backlight registration failed\n"); 167 goto error; 168 } 169 170 pdata->rinfo = rinfo; 171 172 /* Pardon me for that hack... maybe some day we can figure out in what 173 * direction backlight should work on a given panel? 174 */ 175 pdata->negative = 176 (rinfo->family != CHIP_FAMILY_RV200 && 177 rinfo->family != CHIP_FAMILY_RV250 && 178 rinfo->family != CHIP_FAMILY_RV280 && 179 rinfo->family != CHIP_FAMILY_RV350); 180 181#ifdef CONFIG_PMAC_BACKLIGHT 182 pdata->negative = pdata->negative || 183 of_machine_is_compatible("PowerBook4,3") || 184 of_machine_is_compatible("PowerBook6,3") || 185 of_machine_is_compatible("PowerBook6,5"); 186#endif 187 188 rinfo->info->bl_dev = bd; 189 fb_bl_default_curve(rinfo->info, 0, 190 63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL, 191 217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL); 192 193 bd->props.brightness = bd->props.max_brightness; 194 bd->props.power = FB_BLANK_UNBLANK; 195 backlight_update_status(bd); 196 197 printk("radeonfb: Backlight initialized (%s)\n", name); 198 199 return; 200 201error: 202 kfree(pdata); 203 return; 204} 205 206void radeonfb_bl_exit(struct radeonfb_info *rinfo) 207{ 208 struct backlight_device *bd = rinfo->info->bl_dev; 209 210 if (bd) { 211 struct radeon_bl_privdata *pdata; 212 213 pdata = bl_get_data(bd); 214 backlight_device_unregister(bd); 215 kfree(pdata); 216 rinfo->info->bl_dev = NULL; 217 218 printk("radeonfb: Backlight unloaded\n"); 219 } 220} 221