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V4L/DVB (4914): Saa7146: Protect access to the IER register by a spinlock

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Protect the access to the IER register of the SAA7146 by the device
spinlock. I2C transfers may use interrupt mode now.

Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Hartmut Birr 2006-11-01 12:46:32 -03:00 committed by Mauro Carvalho Chehab
parent 122b5dbea6
commit 88bbdf74fc
1 changed files with 14 additions and 4 deletions
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18
include/media/saa7146.h
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@ -42,10 +42,20 @@ extern unsigned int saa7146_debug;
#define DEB_INT(x) if (0!=(DEBUG_VARIABLE&0x20)) { DEBUG_PROLOG; printk x; } /* interrupt debug messages */
#define DEB_CAP(x) if (0!=(DEBUG_VARIABLE&0x40)) { DEBUG_PROLOG; printk x; } /* capture debug messages */
#define SAA7146_IER_DISABLE(x,y) \
saa7146_write(x, IER, saa7146_read(x, IER) & ~(y));
#define SAA7146_IER_ENABLE(x,y) \
saa7146_write(x, IER, saa7146_read(x, IER) | (y));
#define SAA7146_IER_DISABLE(x,y) \
do { \
unsigned int flags; \
spin_lock_irqsave(&x->int_slock, flags); \
saa7146_write(x, IER, saa7146_read(x, IER) & ~(y)); \
spin_unlock_irqrestore(&x->int_slock, flags); \
} while(0)
#define SAA7146_IER_ENABLE(x,y) \
do { \
unsigned int flags; \
spin_lock_irqsave(&x->int_slock, flags); \
saa7146_write(x, IER, saa7146_read(x, IER) | (y)); \
spin_unlock_irqrestore(&x->int_slock, flags); \
} while(0)
#define SAA7146_ISR_CLEAR(x,y) \
saa7146_write(x, ISR, (y));