diff options
Diffstat (limited to 'drivers/video/fbdev/aty/radeon_backlight.c')
| -rw-r--r-- | drivers/video/fbdev/aty/radeon_backlight.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/drivers/video/fbdev/aty/radeon_backlight.c b/drivers/video/fbdev/aty/radeon_backlight.c new file mode 100644 index 000000000000..db572df7e1ef --- /dev/null +++ b/drivers/video/fbdev/aty/radeon_backlight.c @@ -0,0 +1,221 @@ +/* + * Backlight code for ATI Radeon based graphic cards + * + * Copyright (c) 2000 Ani Joshi <ajoshi@kernel.crashing.org> + * Copyright (c) 2003 Benjamin Herrenschmidt <benh@kernel.crashing.org> + * Copyright (c) 2006 Michael Hanselmann <linux-kernel@hansmi.ch> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include "radeonfb.h" +#include <linux/backlight.h> +#include <linux/slab.h> + +#ifdef CONFIG_PMAC_BACKLIGHT +#include <asm/backlight.h> +#endif + +#define MAX_RADEON_LEVEL 0xFF + +struct radeon_bl_privdata { + struct radeonfb_info *rinfo; + uint8_t negative; +}; + +static int radeon_bl_get_level_brightness(struct radeon_bl_privdata *pdata, + int level) +{ + int rlevel; + + /* Get and convert the value */ + /* No locking of bl_curve since we read a single value */ + rlevel = pdata->rinfo->info->bl_curve[level] * + FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL; + + if (rlevel < 0) + rlevel = 0; + else if (rlevel > MAX_RADEON_LEVEL) + rlevel = MAX_RADEON_LEVEL; + + if (pdata->negative) + rlevel = MAX_RADEON_LEVEL - rlevel; + + return rlevel; +} + +static int radeon_bl_update_status(struct backlight_device *bd) +{ + struct radeon_bl_privdata *pdata = bl_get_data(bd); + struct radeonfb_info *rinfo = pdata->rinfo; + u32 lvds_gen_cntl, tmpPixclksCntl; + int level; + + if (rinfo->mon1_type != MT_LCD) + return 0; + + /* We turn off the LCD completely instead of just dimming the + * backlight. This provides some greater power saving and the display + * is useless without backlight anyway. + */ + if (bd->props.power != FB_BLANK_UNBLANK || + bd->props.fb_blank != FB_BLANK_UNBLANK) + level = 0; + else + level = bd->props.brightness; + + del_timer_sync(&rinfo->lvds_timer); + radeon_engine_idle(); + + lvds_gen_cntl = INREG(LVDS_GEN_CNTL); + if (level > 0) { + lvds_gen_cntl &= ~LVDS_DISPLAY_DIS; + if (!(lvds_gen_cntl & LVDS_BLON) || !(lvds_gen_cntl & LVDS_ON)) { + lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_DIGON); + lvds_gen_cntl |= LVDS_BLON | LVDS_EN; + OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); + lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK; + lvds_gen_cntl |= + (radeon_bl_get_level_brightness(pdata, level) << + LVDS_BL_MOD_LEVEL_SHIFT); + lvds_gen_cntl |= LVDS_ON; + lvds_gen_cntl |= (rinfo->init_state.lvds_gen_cntl & LVDS_BL_MOD_EN); + rinfo->pending_lvds_gen_cntl = lvds_gen_cntl; + mod_timer(&rinfo->lvds_timer, + jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay)); + } else { + lvds_gen_cntl &= ~LVDS_BL_MOD_LEVEL_MASK; + lvds_gen_cntl |= + (radeon_bl_get_level_brightness(pdata, level) << + LVDS_BL_MOD_LEVEL_SHIFT); + OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); + } + rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK; + rinfo->init_state.lvds_gen_cntl |= rinfo->pending_lvds_gen_cntl + & LVDS_STATE_MASK; + } else { + /* Asic bug, when turning off LVDS_ON, we have to make sure + RADEON_PIXCLK_LVDS_ALWAYS_ON bit is off + */ + tmpPixclksCntl = INPLL(PIXCLKS_CNTL); + if (rinfo->is_mobility || rinfo->is_IGP) + OUTPLLP(PIXCLKS_CNTL, 0, ~PIXCLK_LVDS_ALWAYS_ONb); + lvds_gen_cntl &= ~(LVDS_BL_MOD_LEVEL_MASK | LVDS_BL_MOD_EN); + lvds_gen_cntl |= (radeon_bl_get_level_brightness(pdata, 0) << + LVDS_BL_MOD_LEVEL_SHIFT); + lvds_gen_cntl |= LVDS_DISPLAY_DIS; + OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); + udelay(100); + lvds_gen_cntl &= ~(LVDS_ON | LVDS_EN); + OUTREG(LVDS_GEN_CNTL, lvds_gen_cntl); + lvds_gen_cntl &= ~(LVDS_DIGON); + rinfo->pending_lvds_gen_cntl = lvds_gen_cntl; + mod_timer(&rinfo->lvds_timer, + jiffies + msecs_to_jiffies(rinfo->panel_info.pwr_delay)); + if (rinfo->is_mobility || rinfo->is_IGP) + OUTPLL(PIXCLKS_CNTL, tmpPixclksCntl); + } + rinfo->init_state.lvds_gen_cntl &= ~LVDS_STATE_MASK; + rinfo->init_state.lvds_gen_cntl |= (lvds_gen_cntl & LVDS_STATE_MASK); + + return 0; +} + +static int radeon_bl_get_brightness(struct backlight_device *bd) +{ + return bd->props.brightness; +} + +static const struct backlight_ops radeon_bl_data = { + .get_brightness = radeon_bl_get_brightness, + .update_status = radeon_bl_update_status, +}; + +void radeonfb_bl_init(struct radeonfb_info *rinfo) +{ + struct backlight_properties props; + struct backlight_device *bd; + struct radeon_bl_privdata *pdata; + char name[12]; + + if (rinfo->mon1_type != MT_LCD) + return; + +#ifdef CONFIG_PMAC_BACKLIGHT + if (!pmac_has_backlight_type("ati") && + !pmac_has_backlight_type("mnca")) + return; +#endif + + pdata = kmalloc(sizeof(struct radeon_bl_privdata), GFP_KERNEL); + if (!pdata) { + printk("radeonfb: Memory allocation failed\n"); + goto error; + } + + snprintf(name, sizeof(name), "radeonbl%d", rinfo->info->node); + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_RAW; + props.max_brightness = FB_BACKLIGHT_LEVELS - 1; + bd = backlight_device_register(name, rinfo->info->dev, pdata, + &radeon_bl_data, &props); + if (IS_ERR(bd)) { + rinfo->info->bl_dev = NULL; + printk("radeonfb: Backlight registration failed\n"); + goto error; + } + + pdata->rinfo = rinfo; + + /* Pardon me for that hack... maybe some day we can figure out in what + * direction backlight should work on a given panel? + */ + pdata->negative = + (rinfo->family != CHIP_FAMILY_RV200 && + rinfo->family != CHIP_FAMILY_RV250 && + rinfo->family != CHIP_FAMILY_RV280 && + rinfo->family != CHIP_FAMILY_RV350); + +#ifdef CONFIG_PMAC_BACKLIGHT + pdata->negative = pdata->negative || + of_machine_is_compatible("PowerBook4,3") || + of_machine_is_compatible("PowerBook6,3") || + of_machine_is_compatible("PowerBook6,5"); +#endif + + rinfo->info->bl_dev = bd; + fb_bl_default_curve(rinfo->info, 0, + 63 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL, + 217 * FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL); + + bd->props.brightness = bd->props.max_brightness; + bd->props.power = FB_BLANK_UNBLANK; + backlight_update_status(bd); + + printk("radeonfb: Backlight initialized (%s)\n", name); + + return; + +error: + kfree(pdata); + return; +} + +void radeonfb_bl_exit(struct radeonfb_info *rinfo) +{ + struct backlight_device *bd = rinfo->info->bl_dev; + + if (bd) { + struct radeon_bl_privdata *pdata; + + pdata = bl_get_data(bd); + backlight_device_unregister(bd); + kfree(pdata); + rinfo->info->bl_dev = NULL; + + printk("radeonfb: Backlight unloaded\n"); + } +} |