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[libata] Introduce ata_id_has_unload()

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Add a function to check an ATA device's id for head unload support as
specified in ATA-7.

Signed-off-by: Elias Oltmanns <eo@nebensachen.de>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Elias Oltmanns 2008-09-19 23:46:01 +02:00 committed by Jeff Garzik
parent 2ad69677b6
commit ea6ce53cd5
1 changed files with 9 additions and 0 deletions
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9
include/linux/ata.h
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@ -667,6 +667,15 @@ static inline int ata_id_has_dword_io(const u16 *id)
return 0;
}
static inline int ata_id_has_unload(const u16 *id)
{
if (ata_id_major_version(id) >= 7 &&
(id[ATA_ID_CFSSE] & 0xC000) == 0x4000 &&
id[ATA_ID_CFSSE] & (1 << 13))
return 1;
return 0;
}
static inline int ata_id_current_chs_valid(const u16 *id)
{
/* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command