libata: identify and init ZPODD devices

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>

2 files changed, 37 insertions, 0 deletions

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 7ae207eb29a0..65ff67e34b77 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -621,6 +621,9 @@ struct ata_device {
         union acpi_object       *gtf_cache;
         unsigned int            gtf_filter;
 #endif
+#ifdef CONFIG_SATA_ZPODD
+        void                    *zpodd;
+#endif
         struct device           tdev;
         /* n_sector is CLEAR_BEGIN, read comment above CLEAR_BEGIN */
         u64                     n_sectors;      /* size of device, if ATA */
diff --git a/include/uapi/linux/cdrom.h b/include/uapi/linux/cdrom.h
index 898b866b300c..bd17ad5aa06d 100644
--- a/include/uapi/linux/cdrom.h
+++ b/include/uapi/linux/cdrom.h
@@ -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 */