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.
Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
---
drivers/ata/libata-acpi.c | 2 +
drivers/ata/libata-core.c | 4 +-
drivers/ata/libata-zpodd.c | 124 +++++++++++++++++++++++++++++++++++++++++++++
drivers/ata/libata.h | 17 +++++++
include/uapi/linux/cdrom.h | 34 +++++++++++++
5 files changed, 180 insertions(+), 1 deletion(-)
diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c
index fd9ecf7..3c61100 100644
--- a/drivers/ata/libata-acpi.c
+++ b/drivers/ata/libata-acpi.c
@@ -1059,6 +1059,8 @@ void ata_acpi_bind(struct ata_device *dev)
void ata_acpi_unbind(struct ata_device *dev)
{
+ if (zpodd_dev_enabled(dev))
+ zpodd_deinit(dev);
ata_acpi_remove_pm_notifier(dev);
ata_acpi_unregister_power_resource(dev);
}
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 3cc7096..a2293b6 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2395,8 +2395,10 @@ 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-zpodd.c b/drivers/ata/libata-zpodd.c
index e69de29..fce6ea6 100644
--- a/drivers/ata/libata-zpodd.c
+++ b/drivers/ata/libata-zpodd.c
@@ -0,0 +1,124 @@
+#include <linux/libata.h>
+#include <linux/cdrom.h>
+
+#include "libata.h"
+
+struct zpodd {
+ bool slot:1;
+ bool drawer:1;
+
+ struct ata_device *dev;
+};
+
+static int run_atapi_cmd(struct ata_device *dev, const char *cdb,
+ unsigned short cdb_len, char *buf, unsigned int buf_len)
+{
+ struct ata_taskfile tf = {0};
+
+ tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE;
+ tf.command = ATA_CMD_PACKET;
+
+ if (buf) {
+ tf.protocol = ATAPI_PROT_PIO;
+ tf.lbam = buf_len;
+ } else {
+ tf.protocol = ATAPI_PROT_NODATA;
+ }
+
+ return ata_exec_internal(dev, &tf, cdb,
+ buf ? DMA_FROM_DEVICE : DMA_NONE, buf, buf_len, 0);
+}
+
+/*
+ * Per the spec, only slot type and drawer type ODD can be supported
+ *
+ * Return 0 for slot type, 1 for drawer, -ENODEV for other types or on error.
+ */
+static int check_loading_mechanism(struct ata_device *dev)
+{
+ char buf[16];
+ unsigned int ret;
+ struct rm_feature_desc *desc = (void *)(buf + 8);
+
+ 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,
+ };
+
+ ret = run_atapi_cmd(dev, cdb, sizeof(cdb), buf, sizeof(buf));
+ if (ret)
+ return -ENODEV;
+
+ if (be16_to_cpu(desc->feature_code) != 3)
+ return -ENODEV;
+
+ if (desc->mech_type == 0 && desc->load == 0 && desc->eject == 1)
+ return 0; /* slot */
+ else if (desc->mech_type == 1 && desc->load == 0 && desc->eject == 1)
+ return 1; /* drawer */
+ else
+ return -ENODEV;
+}
+
+static bool device_can_poweroff(struct ata_device *ata_dev)
+{
+ acpi_handle handle;
+ acpi_status status;
+ struct acpi_device_power_state *states;
+ 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;
+
+ /*
+ * If firmware has _PS3 or _PR3 for this device,
+ * it means this device can be runtime powered off
+ */
+ states = acpi_dev->power.states;
+ if (states[ACPI_STATE_D3_HOT].flags.valid ||
+ states[ACPI_STATE_D3_COLD].flags.explicit_set)
+ return true;
+ else
+ return false;
+}
+
+void zpodd_init(struct ata_device *dev)
+{
+ int ret;
+ struct zpodd *zpodd;
+
+ if (dev->private_data)
+ return;
+
+ if (!device_can_poweroff(dev))
+ return;
+
+ if ((ret = check_loading_mechanism(dev)) == -ENODEV)
+ return;
+
+ zpodd = kzalloc(sizeof(struct zpodd), GFP_KERNEL);
+ if (!zpodd)
+ return;
+
+ if (ret)
+ zpodd->drawer = true;
+ else
+ zpodd->slot = true;
+
+ zpodd->dev = dev;
+ dev->private_data = zpodd;
+}
+
+void zpodd_deinit(struct ata_device *dev)
+{
+ kfree(dev->private_data);
+ dev->private_data = NULL;
+}
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 7148a58..55ad37e 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -230,4 +230,21 @@ 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_deinit(struct ata_device *dev);
+static inline bool zpodd_dev_enabled(struct ata_device *dev)
+{
+ if (dev->flags & ATA_DFLAG_DA && dev->private_data)
+ return true;
+ else
+ return false;
+}
+#else /* CONFIG_SATA_ZPODD */
+static inline void zpodd_init(struct ata_device *dev) {}
+static inline void zpodd_deinit(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/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 */
--
1.7.12.4
--
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