Messages in this thread Patch in this message |  | | | From | Elias Oltmanns <> | | Subject | [PATCH 1/4 v2] Introduce ata_id_has_unload() | | Date | Wed, 17 Sep 2008 18:34:53 +0200 |
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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> --- include/linux/ata.h | 9 +++++++++ 1 files changed, 9 insertions(+), 0 deletions(-) diff --git a/include/linux/ata.h b/include/linux/ata.h index cea079c..c66a7d6 100644 --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -707,6 +707,15 @@ 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
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