e01af0384f
This patch fixes several problems: - pmac_backlight_key() is called under interrupt context, and therefore can't use mutexes or semaphores, so defer the backlight level for later, as it's not critical (original code by Aristeu S. Rozanski F. <aris@valeta.org>). - Add exports for functions that might be called from modules - Fix Kconfig depdencies on PMAC_BACKLIGHT. - Fix locking issues on calls from inside the driver (reported by Aristeu S. Rozanski F., too) - Fix wrong calculation of backlight values in some of the drivers - Replace pmac_backlight_key_up/down by inline functions [akpm@osdl.org: fix function prototypes] Signed-off-by: Michael Hanselmann <linux-kernel@hansmi.ch> Acked-by: Aristeu S. Rozanski F. <aris@valeta.org> Acked-by: Rene Nussbaumer <linux-kernel@killerfox.forkbomb.ch> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
38 lines
922 B
C
38 lines
922 B
C
/*
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* Routines for handling backlight control on PowerBooks
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*
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* For now, implementation resides in
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* arch/powerpc/platforms/powermac/backlight.c
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*
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*/
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#ifndef __ASM_POWERPC_BACKLIGHT_H
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#define __ASM_POWERPC_BACKLIGHT_H
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#ifdef __KERNEL__
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#include <linux/fb.h>
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#include <linux/mutex.h>
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/* For locking instructions, see the implementation file */
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extern struct backlight_device *pmac_backlight;
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extern struct mutex pmac_backlight_mutex;
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extern int pmac_backlight_curve_lookup(struct fb_info *info, int value);
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extern int pmac_has_backlight_type(const char *type);
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extern void pmac_backlight_key(int direction);
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static inline void pmac_backlight_key_up(void)
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{
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pmac_backlight_key(0);
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}
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static inline void pmac_backlight_key_down(void)
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{
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pmac_backlight_key(1);
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}
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extern int pmac_backlight_set_legacy_brightness(int brightness);
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extern int pmac_backlight_get_legacy_brightness(void);
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#endif /* __KERNEL__ */
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#endif
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