From 0094f2cdcfb6f2132b2ea3b4e85e0f6899c8595b Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Thu, 20 Dec 2007 15:00:21 +1100 Subject: [POWERPC] Fix for via-pmu based backlight control This fixes a few issues with via-pmu based backlight control. First, it fixes a sign problem with the setup of the backlight curve since the `range' value there -can- (and will) go negative. Then, it reworks the interaction between this and the via-pmu sleep code to properly restore backlight on wakeup from sleep. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras --- drivers/macintosh/via-pmu-backlight.c | 48 +++++++++++++++++++++-------------- 1 file changed, 29 insertions(+), 19 deletions(-) (limited to 'drivers/macintosh/via-pmu-backlight.c') diff --git a/drivers/macintosh/via-pmu-backlight.c b/drivers/macintosh/via-pmu-backlight.c index 7e27071746e4..741a2e3f4fc6 100644 --- a/drivers/macintosh/via-pmu-backlight.c +++ b/drivers/macintosh/via-pmu-backlight.c @@ -22,7 +22,7 @@ static u8 bl_curve[FB_BACKLIGHT_LEVELS]; static void pmu_backlight_init_curve(u8 off, u8 min, u8 max) { - unsigned int i, flat, count, range = (max - min); + int i, flat, count, range = (max - min); bl_curve[0] = off; @@ -68,17 +68,11 @@ static int pmu_backlight_get_level_brightness(int level) return pmulevel; } -static int pmu_backlight_update_status(struct backlight_device *bd) +static int __pmu_backlight_update_status(struct backlight_device *bd) { struct adb_request req; - unsigned long flags; int level = bd->props.brightness; - 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) @@ -99,12 +93,23 @@ static int pmu_backlight_update_status(struct backlight_device *bd) pmu_wait_complete(&req); } -out: - spin_unlock_irqrestore(&pmu_backlight_lock, flags); - return 0; } +static int pmu_backlight_update_status(struct backlight_device *bd) +{ + unsigned long flags; + int rc = 0; + + spin_lock_irqsave(&pmu_backlight_lock, flags); + /* Don't update brightness when sleeping */ + if (!sleeping) + rc = __pmu_backlight_update_status(bd); + spin_unlock_irqrestore(&pmu_backlight_lock, flags); + return rc; +} + + static int pmu_backlight_get_brightness(struct backlight_device *bd) { return bd->props.brightness; @@ -123,6 +128,16 @@ void pmu_backlight_set_sleep(int sleep) spin_lock_irqsave(&pmu_backlight_lock, flags); sleeping = sleep; + if (pmac_backlight) { + if (sleep) { + struct adb_request req; + + pmu_request(&req, NULL, 2, PMU_POWER_CTRL, + PMU_POW_BACKLIGHT | PMU_POW_OFF); + pmu_wait_complete(&req); + } else + __pmu_backlight_update_status(pmac_backlight); + } spin_unlock_irqrestore(&pmu_backlight_lock, flags); } #endif /* CONFIG_PM */ @@ -148,8 +163,8 @@ void __init pmu_backlight_init() bd = backlight_device_register(name, NULL, NULL, &pmu_backlight_data); if (IS_ERR(bd)) { - printk("pmubl: Backlight registration failed\n"); - goto error; + printk(KERN_ERR "PMU Backlight registration failed\n"); + return; } bd->props.max_brightness = FB_BACKLIGHT_LEVELS - 1; pmu_backlight_init_curve(0x7F, 0x46, 0x0E); @@ -171,10 +186,5 @@ void __init pmu_backlight_init() bd->props.power = FB_BLANK_UNBLANK; backlight_update_status(bd); - printk("pmubl: Backlight initialized (%s)\n", name); - - return; - -error: - return; + printk(KERN_INFO "PMU Backlight initialized (%s)\n", name); } -- cgit v1.2.3-55-g7522