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[PATCH] powermac: More powermac backlight fixes

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This patch fixes several problems:
- The legacy backlight value might be set at interrupt time. Introduced
  a worker to prevent it from directly calling the backlight code.
- via-pmu allows the backlight to be grabbed, in which case we need to
  prevent other kernel code from changing the brightness.
- Don't send PMU requests in via-pmu-backlight when the machine is about
  to sleep or waking up.
- More Kconfig fixes.

Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Michael Hanselmann
2006-07-30 03:04:19 -07:00
committed by Linus Torvalds
parent 994aad251a
commit 4b755999d6
10 changed files with 148 additions and 77 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/macintosh/via-pmu-backlight.c
+55 -13
View File
@@ -15,8 +15,9 @@
#define MAX_PMU_LEVEL 0xFF
static struct device_node *vias;
static struct backlight_properties pmu_backlight_data;
static spinlock_t pmu_backlight_lock;
static int sleeping;
static int pmu_backlight_get_level_brightness(struct fb_info *info,
int level)
@@ -40,23 +41,36 @@ static int pmu_backlight_update_status(struct backlight_device *bd)
{
struct fb_info *info = class_get_devdata(&bd->class_dev);
struct adb_request req;
int pmulevel, level = bd->props->brightness;
unsigned long flags;
int level = bd->props->brightness;
if (vias == NULL)
return -ENODEV;
spin_lock_irqsave(&pmu_backlight_lock, flags);
/* Don't update brightness when sleeping */
if (sleeping)
goto out;
if (bd->props->power != FB_BLANK_UNBLANK ||
bd->props->fb_blank != FB_BLANK_UNBLANK)
level = 0;
pmulevel = pmu_backlight_get_level_brightness(info, level);
if (level > 0) {
int pmulevel = pmu_backlight_get_level_brightness(info, level);
pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT, pmulevel);
pmu_wait_complete(&req);
pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT, pmulevel);
pmu_wait_complete(&req);
pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
PMU_POW_BACKLIGHT | (level > 0 ? PMU_POW_ON : PMU_POW_OFF));
pmu_wait_complete(&req);
pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
PMU_POW_BACKLIGHT | PMU_POW_ON);
pmu_wait_complete(&req);
} else {
pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
PMU_POW_BACKLIGHT | PMU_POW_OFF);
pmu_wait_complete(&req);
}
out:
spin_unlock_irqrestore(&pmu_backlight_lock, flags);
return 0;
}
@@ -73,15 +87,39 @@ static struct backlight_properties pmu_backlight_data = {
.max_brightness = (FB_BACKLIGHT_LEVELS - 1),
};
void __init pmu_backlight_init(struct device_node *in_vias)
#ifdef CONFIG_PM
static int pmu_backlight_sleep_call(struct pmu_sleep_notifier *self, int when)
{
unsigned long flags;
spin_lock_irqsave(&pmu_backlight_lock, flags);
switch (when) {
case PBOOK_SLEEP_REQUEST:
sleeping = 1;
break;
case PBOOK_WAKE:
sleeping = 0;
break;
}
spin_unlock_irqrestore(&pmu_backlight_lock, flags);
return PBOOK_SLEEP_OK;
}
static struct pmu_sleep_notifier pmu_backlight_sleep_notif = {
.notifier_call = pmu_backlight_sleep_call,
};
#endif
void __init pmu_backlight_init()
{
struct backlight_device *bd;
struct fb_info *info;
char name[10];
int level, autosave;
vias = in_vias;
/* Special case for the old PowerBook since I can't test on it */
autosave =
machine_is_compatible("AAPL,3400/2400") ||
@@ -141,6 +179,10 @@ void __init pmu_backlight_init(struct device_node *in_vias)
pmac_backlight = bd;
mutex_unlock(&pmac_backlight_mutex);
#ifdef CONFIG_PM
pmu_register_sleep_notifier(&pmu_backlight_sleep_notif);
#endif
printk("pmubl: Backlight initialized (%s)\n", name);
return;