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[PATCH] libata: implement ata_port_max_devices() 

Implement ata_port_max_devices().  This function returns the number of
possible devices on a port.  This will be used by new PM
implementation.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Tejun Heo 2006-06-24 20:30:19 +09:00 committed by Jeff Garzik
parent 77b08fb56a
commit 5806db22cf
1 changed files with 14 additions and 0 deletions
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14
include/linux/libata.h
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@ -888,6 +888,9 @@ static inline unsigned int ata_tag_internal(unsigned int tag)
return tag == ATA_MAX_QUEUE - 1;
}
/*
* device helpers
*/
static inline unsigned int ata_class_enabled(unsigned int class)
{
return class == ATA_DEV_ATA || class == ATA_DEV_ATAPI;
@ -918,6 +921,17 @@ static inline unsigned int ata_dev_absent(const struct ata_device *dev)
return ata_class_absent(dev->class);
}
/*
* port helpers
*/
static inline int ata_port_max_devices(const struct ata_port *ap)
{
if (ap->flags & ATA_FLAG_SLAVE_POSS)
return 2;
return 1;
}
static inline u8 ata_chk_status(struct ata_port *ap)
{
return ap->ops->check_status(ap);