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kernel-fxtec-pro1x/drivers/video/aty/radeon_backlight.c
Richard Purdie 28ee086d5b backlight: Fix external uses of backlight internal semaphore 
backlight_device->sem has a very specific use as documented in the
header file. The external users of this are using it for a different
reason, to serialise access to the update_status() method.

backlight users were supposed to implement their own internal
serialisation of update_status() if needed but everyone is doing
things differently and incorrectly. Therefore add a global mutex to
take care of serialisation for everyone, once and for all.

Locking for get_brightness remains optional since most users don't
need it.

Also update the lcd class in a similar way.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
2007-02-20 08:38:45 +00:00

244 lines
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/*
* 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>
#ifdef CONFIG_PMAC_BACKLIGHT
#include <asm/backlight.h>
#endif
#define MAX_RADEON_LEVEL 0xFF
static struct backlight_properties radeon_bl_data;
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)
{
struct fb_info *info = pdata->rinfo->info;
int rlevel;
mutex_lock(&info->bl_mutex);
/* Get and convert the value */
rlevel = pdata->rinfo->info->bl_curve[level] *
FB_BACKLIGHT_MAX / MAX_RADEON_LEVEL;
mutex_unlock(&info->bl_mutex);
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 = class_get_devdata(&bd->class_dev);
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 struct backlight_properties radeon_bl_data = {
.get_brightness = radeon_bl_get_brightness,
.update_status = radeon_bl_update_status,
.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
};
void radeonfb_bl_init(struct radeonfb_info *rinfo)
{
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);
bd = backlight_device_register(name, rinfo->info->dev, pdata, &radeon_bl_data);
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 ||
machine_is_compatible("PowerBook4,3") ||
machine_is_compatible("PowerBook6,3") ||
machine_is_compatible("PowerBook6,5");
#endif
mutex_lock(&rinfo->info->bl_mutex);
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);
mutex_unlock(&rinfo->info->bl_mutex);
bd->props->brightness = radeon_bl_data.max_brightness;
bd->props->power = FB_BLANK_UNBLANK;
backlight_update_status(bd);
#ifdef CONFIG_PMAC_BACKLIGHT
mutex_lock(&pmac_backlight_mutex);
if (!pmac_backlight)
pmac_backlight = bd;
mutex_unlock(&pmac_backlight_mutex);
#endif
printk("radeonfb: Backlight initialized (%s)\n", name);
return;
error:
kfree(pdata);
return;
}
void radeonfb_bl_exit(struct radeonfb_info *rinfo)
{
#ifdef CONFIG_PMAC_BACKLIGHT
mutex_lock(&pmac_backlight_mutex);
#endif
mutex_lock(&rinfo->info->bl_mutex);
if (rinfo->info->bl_dev) {
struct radeon_bl_privdata *pdata;
#ifdef CONFIG_PMAC_BACKLIGHT
if (pmac_backlight == rinfo->info->bl_dev)
pmac_backlight = NULL;
#endif
pdata = class_get_devdata(&rinfo->info->bl_dev->class_dev);
backlight_device_unregister(rinfo->info->bl_dev);
kfree(pdata);
rinfo->info->bl_dev = NULL;
printk("radeonfb: Backlight unloaded\n");
}
mutex_unlock(&rinfo->info->bl_mutex);
#ifdef CONFIG_PMAC_BACKLIGHT
mutex_unlock(&pmac_backlight_mutex);
#endif
}
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