[PATCH 1/4] Introduce ata_id_has_unload()
From: Elias Oltmanns <hidden>
Date: 2008-08-29 21:17:50
Also in:
linux-ide
Subsystem:
libata subsystem (serial and parallel ata drivers), the rest · Maintainers:
Damien Le Moal, Niklas Cassel, Linus Torvalds
Add a function to check an ATA device's id for head unload support as specified in ATA-7. Signed-off-by: Elias Oltmanns <redacted> --- include/linux/ata.h | 17 +++++++++++++++++ 1 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 80364b6..d9a94bd 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h@@ -707,6 +707,23 @@ static inline int ata_id_has_dword_io(const u16 *id) return 0; } +static inline int ata_id_has_unload(const u16 *id) +{ + /* + * ATA-7 specifies two places to indicate unload feature + * support. Since I don't really understand the difference, + * I'll just check both and only return zero if none of them + * indicates otherwise. + */ + if (ata_id_major_version(id) >= 7 + && (((id[ATA_ID_CFSSE] & 0xC000) == 0x4000 + && id[ATA_ID_CFSSE] & (1 << 13)) + || ((id[ATA_ID_CSF_DEFAULT] & 0xC000) == 0x4000 + && (id[ATA_ID_CSF_DEFAULT] & (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