drivers/video/aty/radeon_backlight.c

   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
  22 static struct backlight_properties radeon_bl_data;
  23
  24 struct radeon_bl_privdata {
  25         struct radeonfb_info *rinfo;
  26         uint8_t negative;
  27 };
  28
  29 static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata,
  30                 int level)
  31 {
  32         int rlevel;
  33
  34         /* Get and convert the value */
  35         /* No locking of bl_curve since we read a single value */
  36         rlevel = pdata->rinfo->info->bl_curve[level] *
  37                  FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;
  38
  39         if (rlevel < 0)
  40                 rlevel = 0;
  41         else if (rlevel > MAX_RADEON_LEVEL)
  42                 rlevel = MAX_RADEON_LEVEL;
  43
  44         if (pdata->negative)
  45                 rlevel = MAX_RADEON_LEVEL - rlevel;
  46
  47         return rlevel;
  48 }
  49
  50 static int radeon_bl_update_status(struct backlight_device *bd)
  51 {
  52         struct radeon_bl_privdata *pdata = class_get_devdata(&bd->class_dev);
  53         struct radeonfb_info *rinfo = pdata->rinfo;
  54         u32 lvds_gen_cntl, tmpPixclksCntl;
  55         int level;
  56
  57         if (rinfo->mon1_type != MT_LCD)
  58                 return 0;
  59
  60         /* We turn off the LCD completely instead of just dimming the
  61          * backlight. This provides some greater power saving and the display
  62          * is useless without backlight anyway.
  63          */
  64         if (bd->props->power != FB_BLANK_UNBLANK ||
  65             bd->props->fb_blank != FB_BLANK_UNBLANK)
  66                 level = 0;
  67         else
  68                 level = bd->props->brightness;
  69
  70         del_timer_sync(&rinfo->lvds_timer);
  71         radeon_engine_idle();
  72
  73         lvds_gen_cntl = INREG(LVDS_GEN_CNTL);
  74         if (level > 0) {
  75                 lvds_gen_cntl &= ~LVDS_DISPLAY_DIS;
  76                 if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) {
  77                         lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON);
  78                         lvds_gen_cntl |= LVDS_BLON | LVDS_EN;
  79                         OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
  80                         lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
  81                         lvds_gen_cntl |=
  82                                 (radeon_bl_get_level_brightness(pdata, level) <<
  83                                  LVDS_BL_MOD_LEVEL_SHIFT);
  84                         lvds_gen_cntl |= LVDS_ON;
  85                         lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN);
  86                         rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
  87                         mod_timer(&rinfo->lvds_timer,
  88                                   jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
  89                 } else {
  90                         lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK;
  91                         lvds_gen_cntl |=
  92                                 (radeon_bl_get_level_brightness(pdata, level) <<
  93                                  LVDS_BL_MOD_LEVEL_SHIFT);
  94                         OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
  95                 }
  96                 rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
  97                 rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl
  98                         & LVDS_STATE_MASK;
  99         } else {
 100                 /* Asic bug, when turning off LVDS_ON, we have to make sure
 101                    RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off
 102                 */
 103                 tmpPixclksCntl = INPLL(PIXCLKS_CNTL);
 104                 if (rinfo->is_mobility || rinfo->is_IGP)
 105                         OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb);
 106                 lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN);
 107                 lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) <<
 108                                   LVDS_BL_MOD_LEVEL_SHIFT);
 109                 lvds_gen_cntl |= LVDS_DISPLAY_DIS;
 110                 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
 111                 udelay(100);
 112                 lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN);
 113                 OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl);
 114                 lvds_gen_cntl &= ~(LVDS_DIGON);
 115                 rinfo->pending_lvds_gen_cntl = lvds_gen_cntl;
 116                 mod_timer(&rinfo->lvds_timer,
 117                           jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay));
 118                 if (rinfo->is_mobility || rinfo->is_IGP)
 119                         OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl);
 120         }
 121         rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK;
 122         rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK);
 123
 124         return 0;
 125 }
 126
 127 static int radeon_bl_get_brightness(struct backlight_device *bd)
 128 {
 129         return bd->props->brightness;
 130 }
 131
 132 static struct backlight_properties radeon_bl_data = {
 133         .get_brightness = radeon_bl_get_brightness,
 134         .update_status  = radeon_bl_update_status,
 135         .max_brightness = (FB_BACKLIGHT_LEVELS - 1),
 136 };
 137
 138 void radeonfb_bl_init(struct radeonfb_info *rinfo)
 139 {
 140         struct backlight_device *bd;
 141         struct radeon_bl_privdata *pdata;
 142         char name[12];
 143
 144         if (rinfo->mon1_type != MT_LCD)
 145                 return;
 146
 147 #ifdef CONFIG_PMAC_BACKLIGHT
 148         if (!pmac_has_backlight_type("ati") &&
 149             !pmac_has_backlight_type("mnca"))
 150                 return;
 151 #endif
 152
 153         pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL);
 154         if (!pdata) {
 155                 printk("radeonfb: Memory allocation failed\n");
 156                 goto error;
 157         }
 158
 159         snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node);
 160
 161         bd = backlight_device_register(name, rinfo->info->dev, pdata, &radeon_bl_data);
 162         if (IS_ERR(bd)) {
 163                 rinfo->info->bl_dev = NULL;
 164                 printk("radeonfb: Backlight registration failed\n");
 165                 goto error;
 166         }
 167
 168         pdata->rinfo = rinfo;
 169
 170         /* Pardon me for that hack... maybe some day we can figure out in what
 171          * direction backlight should work on a given panel?
 172          */
 173         pdata->negative =
 174                 (rinfo->family != CHIP_FAMILY_RV200 &&
 175                  rinfo->family != CHIP_FAMILY_RV250 &&
 176                  rinfo->family != CHIP_FAMILY_RV280 &&
 177                  rinfo->family != CHIP_FAMILY_RV350);
 178
 179 #ifdef CONFIG_PMAC_BACKLIGHT
 180         pdata->negative = pdata->negative ||
 181                 machine_is_compatible("PowerBook4,3") ||
 182                 machine_is_compatible("PowerBook6,3") ||
 183                 machine_is_compatible("PowerBook6,5");
 184 #endif
 185
 186         rinfo->info->bl_dev = bd;
 187         fb_bl_default_curve(rinfo->info, 0,
 188                  63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL,
 189                 217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL);
 190
 191         bd->props->brightness = radeon_bl_data.max_brightness;
 192         bd->props->power = FB_BLANK_UNBLANK;
 193         backlight_update_status(bd);
 194
 195         printk("radeonfb: Backlight initialized (%s)\n", name);
 196
 197         return;
 198
 199 error:
 200         kfree(pdata);
 201         return;
 202 }
 203
 204 void radeonfb_bl_exit(struct radeonfb_info *rinfo)
 205 {
 206         struct backlight_device *bd = rinfo->info->bl_dev;
 207
 208         if (bd) {
 209                 struct radeon_bl_privdata *pdata;
 210
 211                 pdata = class_get_devdata(&bd->class_dev);
 212                 backlight_device_unregister(bd);
 213                 kfree(pdata);
 214                 rinfo->info->bl_dev = NULL;
 215
 216                 printk("radeonfb: Backlight unloaded\n");
 217         }
 218 }