[libata] Introduce ata_id_has_unload()
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>
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@ -667,6 +667,15 @@ static inline int ata_id_has_dword_io(const u16 *id)
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return 0;
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}
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static inline int ata_id_has_unload(const u16 *id)
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{
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if (ata_id_major_version(id) >= 7 &&
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(id[ATA_ID_CFSSE] & 0xC000) == 0x4000 &&
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id[ATA_ID_CFSSE] & (1 << 13))
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return 1;
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return 0;
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}
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static inline int ata_id_current_chs_valid(const u16 *id)
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{
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/* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command
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