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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
commit afe7595118
8 changed files with 170 additions and 1 deletions
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3
include/linux/libata.h
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@ -620,6 +620,9 @@ struct ata_device {
#ifdef CONFIG_ATA_ACPI
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 */