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@xxxxxxxxx>
---
drivers/ata/Kconfig | 13 ++++++
drivers/ata/Makefile | 1 +
drivers/ata/libata-core.c | 4 +-
drivers/ata/libata-scsi.c | 2 +
drivers/ata/libata-zpodd.c | 100 +++++++++++++++++++++++++++++++++++++++++++++
drivers/ata/libata.h | 14 +++++++
include/linux/libata.h | 3 ++
include/uapi/linux/cdrom.h | 34 +++++++++++++++
8 files changed, 170 insertions(+), 1 deletion(-)
create mode 100644 drivers/ata/libata-zpodd.c
diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index e08d322..996d16c 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -58,6 +58,19 @@ config ATA_ACPI
You can disable this at kernel boot time by using the
option libata.noacpi=1
+config SATA_ZPODD
+ bool "SATA Zero Power ODD Support"
+ depends on ATA_ACPI
+ default n
+ help
+ This option adds support for SATA ZPODD. It requires both
+ ODD and the platform support, and if enabled, will automatically
+ power on/off the ODD when certain condition is satisfied. This
+ does not impact user's experience of the ODD, only power is saved
+ when ODD is not in use(i.e. no disc inside).
+
+ If unsure, say N.
+
config SATA_PMP
bool "SATA Port Multiplier support"
default y
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index 9329daf..85e3de4 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -107,3 +107,4 @@ libata-y := libata-core.o libata-scsi.o libata-eh.o libata-transport.o
libata-$(CONFIG_ATA_SFF) += libata-sff.o
libata-$(CONFIG_SATA_PMP) += libata-pmp.o
libata-$(CONFIG_ATA_ACPI) += libata-acpi.o
+libata-$(CONFIG_SATA_ZPODD) += libata-zpodd.o
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 9e8b99a..65a362e 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2396,8 +2396,10 @@ int ata_dev_configure(struct ata_device *dev)
dma_dir_string = ", DMADIR";
}
- if (ata_id_has_da(dev->id))
+ if (ata_id_has_da(dev->id)) {
dev->flags |= ATA_DFLAG_DA;
+ zpodd_init(dev);
+ }
/* print device info to dmesg */
if (ata_msg_drv(ap) && print_info)
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 7c337e7..1ff0185 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -3755,6 +3755,8 @@ static void ata_scsi_remove_dev(struct ata_device *dev)
mutex_lock(&ap->scsi_host->scan_mutex);
spin_lock_irqsave(ap->lock, flags);
+ if (zpodd_dev_enabled(dev))
+ zpodd_exit(dev);
ata_acpi_unbind(dev);
/* clearing dev->sdev is protected by host lock */
diff --git a/drivers/ata/libata-zpodd.c b/drivers/ata/libata-zpodd.c
new file mode 100644
index 0000000..27eed2f
--- /dev/null
+++ b/drivers/ata/libata-zpodd.c
@@ -0,0 +1,100 @@
+#include <linux/libata.h>
+#include <linux/cdrom.h>
+
+#include "libata.h"
+
+enum odd_mech_type {
+ ODD_MECH_TYPE_SLOT,
+ ODD_MECH_TYPE_DRAWER,
+ ODD_MECH_TYPE_UNSUPPORTED,
+};
+
+struct zpodd {
+ enum odd_mech_type mech_type; /* init during probe, RO afterwards */
+ struct ata_device *dev;
+};
+
+/* Per the spec, only slot type and drawer type ODD can be supported */
+static enum odd_mech_type zpodd_get_mech_type(struct ata_device *dev)
+{
+ char buf[16];
+ unsigned int ret;
+ struct rm_feature_desc *desc = (void *)(buf + 8);
+ struct ata_taskfile tf = {};
+
+ char cdb[] = { GPCMD_GET_CONFIGURATION,
+ 2, /* only 1 feature descriptor requested */
+ 0, 3, /* 3, removable medium feature */
+ 0, 0, 0,/* reserved */
+ 0, sizeof(buf),
+ 0, 0, 0,
+ };
+
+ tf.flags = ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ tf.command = ATA_CMD_PACKET;
+ tf.protocol = ATAPI_PROT_PIO;
+ tf.lbam = sizeof(buf);
+
+ ret = ata_exec_internal(dev, &tf, cdb, DMA_FROM_DEVICE,
+ buf, sizeof(buf), 0);
+ if (ret)
+ return ODD_MECH_TYPE_UNSUPPORTED;
+
+ if (be16_to_cpu(desc->feature_code) != 3)
+ return ODD_MECH_TYPE_UNSUPPORTED;
+
+ if (desc->mech_type == 0 && desc->load == 0 && desc->eject == 1)
+ return ODD_MECH_TYPE_SLOT;
+ else if (desc->mech_type == 1 && desc->load == 0 && desc->eject == 1)
+ return ODD_MECH_TYPE_DRAWER;
+ else
+ return ODD_MECH_TYPE_UNSUPPORTED;
+}
+
+static bool odd_can_poweroff(struct ata_device *ata_dev)
+{
+ acpi_handle handle;
+ acpi_status status;
+ struct acpi_device *acpi_dev;
+
+ handle = ata_dev_acpi_handle(ata_dev);
+ if (!handle)
+ return false;
+
+ status = acpi_bus_get_device(handle, &acpi_dev);
+ if (ACPI_FAILURE(status))
+ return false;
+
+ return acpi_device_can_poweroff(acpi_dev);
+}
+
+void zpodd_init(struct ata_device *dev)
+{
+ enum odd_mech_type mech_type;
+ struct zpodd *zpodd;
+
+ if (dev->zpodd)
+ return;
+
+ if (!odd_can_poweroff(dev))
+ return;
+
+ mech_type = zpodd_get_mech_type(dev);
+ if (mech_type == ODD_MECH_TYPE_UNSUPPORTED)
+ return;
+
+ zpodd = kzalloc(sizeof(struct zpodd), GFP_KERNEL);
+ if (!zpodd)
+ return;
+
+ zpodd->mech_type = mech_type;
+
+ zpodd->dev = dev;
+ dev->zpodd = zpodd;
+}
+
+void zpodd_exit(struct ata_device *dev)
+{
+ kfree(dev->zpodd);
+ dev->zpodd = NULL;
+}
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 7148a58..a21740b 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -230,4 +230,18 @@ static inline void ata_sff_exit(void)
{ }
#endif /* CONFIG_ATA_SFF */
+/* libata-zpodd.c */
+#ifdef CONFIG_SATA_ZPODD
+void zpodd_init(struct ata_device *dev);
+void zpodd_exit(struct ata_device *dev);
+static inline bool zpodd_dev_enabled(struct ata_device *dev)
+{
+ return dev->zpodd != NULL;
+}
+#else /* CONFIG_SATA_ZPODD */
+static inline void zpodd_init(struct ata_device *dev) {}
+static inline void zpodd_exit(struct ata_device *dev) {}
+static inline bool zpodd_dev_enabled(struct ata_device *dev) { return false; }
+#endif /* CONFIG_SATA_ZPODD */
+
#endif /* __LIBATA_H__ */
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 83ba0ab..f88f909 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -620,6 +620,9 @@ 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 898b866..bd17ad5 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 */
--
1.7.11.7
--
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