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libata: identify and init ZPODD devices

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The ODD can be enabled for ZPODD if the following three conditions are
satisfied:
1 The ODD supports device attention;
2 The platform can runtime power off the ODD through ACPI;
3 The ODD is either slot type or drawer type.
For such ODDs, zpodd_init is called and a new structure is allocated for
it to store ZPODD related stuffs.

And the zpodd_dev_enabled function is used to test if ZPODD is currently
enabled for this ODD.

A new config CONFIG_SATA_ZPODD is added to selectively build ZPODD code.

Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Aaron Lu
2013-01-15 17:20:58 +08:00
committed by Jeff Garzik
parent 1757d902b0
commit afe7595118
8 changed files with 170 additions and 1 deletions
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34
include/uapi/linux/cdrom.h
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@@ -908,5 +908,39 @@ struct mode_page_header {
__be16 desc_length;
};
/* removable medium feature descriptor */
struct rm_feature_desc {
__be16 feature_code;
#if defined(__BIG_ENDIAN_BITFIELD)
__u8 reserved1:2;
__u8 feature_version:4;
__u8 persistent:1;
__u8 curr:1;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
__u8 curr:1;
__u8 persistent:1;
__u8 feature_version:4;
__u8 reserved1:2;
#endif
__u8 add_len;
#if defined(__BIG_ENDIAN_BITFIELD)
__u8 mech_type:3;
__u8 load:1;
__u8 eject:1;
__u8 pvnt_jmpr:1;
__u8 dbml:1;
__u8 lock:1;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
__u8 lock:1;
__u8 dbml:1;
__u8 pvnt_jmpr:1;
__u8 eject:1;
__u8 load:1;
__u8 mech_type:3;
#endif
__u8 reserved2;
__u8 reserved3;
__u8 reserved4;
};
#endif /* _UAPI_LINUX_CDROM_H */