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 22struct radeon_bl_privdata { 23 struct radeonfb_info *rinfo; 24 uint8_t negative; 25}; 26 27static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata, 28 int level) 29{ 30 int rlevel; 31 32 /* Get and convert the value */ 33 /* No locking of bl_curve since we read a single value */ 34 rlevel = pdata->rinfo->info->bl_curve[level] * 35 FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL; 36 37 if (rlevel < 0) 38 rlevel = 0; 39 else if (rlevel > MAX_RADEON_LEVEL) 40 rlevel = MAX_RADEON_LEVEL; 41 42 if (pdata->negative) 43 rlevel = MAX_RADEON_LEVEL - rlevel; 44 45 return rlevel; 46} 47 48static int radeon_bl_update_status(struct backlight_device *bd) 49{ 50 struct radeon_bl_privdata *pdata = class_get_devdata(&bd->class_dev); 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 */ 62 if (bd->props.power != FB_BLANK_UNBLANK || 63 bd->props.fb_blank != FB_BLANK_UNBLANK) 64 level = 0; 65 else 66 level = bd->props.brightness; 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 125static int radeon_bl_get_brightness(struct backlight_device *bd) 126{ 127 return bd->props.brightness; 128} 129 130static struct backlight_ops radeon_bl_data = { 131 .get_brightness = radeon_bl_get_brightness, 132 .update_status = radeon_bl_update_status, 133}; 134 135void 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); 157 158 bd = backlight_device_register(name, rinfo->info->dev, pdata, &radeon_bl_data); 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 182 183 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.max_brightness = FB_BACKLIGHT_LEVELS - 1; 189 bd->props.brightness = bd->props.max_brightness; 190 bd->props.power = FB_BLANK_UNBLANK; 191 backlight_update_status(bd); 192 193 printk("radeonfb: Backlight initialized (%s)\n", name); 194 195 return; 196 197error: 198 kfree(pdata); 199 return; 200} 201 202void radeonfb_bl_exit(struct radeonfb_info *rinfo) 203{ 204 struct backlight_device *bd = rinfo->info->bl_dev; 205 206 if (bd) { 207 struct radeon_bl_privdata *pdata; 208 209 pdata = class_get_devdata(&bd->class_dev); 210 backlight_device_unregister(bd); 211 kfree(pdata); 212 rinfo->info->bl_dev = NULL; 213 214 printk("radeonfb: Backlight unloaded\n"); 215 } 216} 217