Per the Mount Fuji spec on SATA ZPODD, only slot type or drawer type
ODD can support ZPODD. So add a function to check this, and if fails,
skip setting of dev->private_data so that zpodd_dev_enabled will return
false.
Signed-off-by: Aaron Lu <aaron.lu@xxxxxxxxx>
---
drivers/ata/sata_zpodd.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/cdrom.h | 35 +++++++++++++++++++
2 files changed, 122 insertions(+)
diff --git a/drivers/ata/sata_zpodd.c b/drivers/ata/sata_zpodd.c
index 009b1e4..c7c63a1 100644
--- a/drivers/ata/sata_zpodd.c
+++ b/drivers/ata/sata_zpodd.c
@@ -1,13 +1,89 @@
#include <linux/libata.h>
#include <linux/pm_runtime.h>
+#include <linux/cdrom.h>
#include <scsi/scsi_device.h>
+#include "libata.h"
+
struct zpodd {
+ bool slot:1;
+ bool drawer:1;
bool from_notify:1; /* resumed as a result of acpi notification */
struct ata_device *dev;
};
+static int zpodd_run_atapi_cmd(struct ata_device *dev, const char *cdb,
+ unsigned short cdb_len, char *buf, unsigned int buf_len)
+{
+ int ret = 0;
+ 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;
+ }
+
+ ata_eh_acquire(dev->link->ap);
+ ret = ata_exec_internal(dev, &tf, cdb, buf ? DMA_FROM_DEVICE : DMA_NONE,
+ buf, buf_len, 0);
+ ata_eh_release(dev->link->ap);
+
+ return ret;
+}
+
+/*
+ * Per the spec, only slot type and drawer type ODD can be supported
+ *
+ * Return 0 for slot, 1 for drawer, and -ENODEV for others or on error.
+ */
+static int check_loading_mechanism(struct ata_device *dev)
+{
+ char buf[16];
+ unsigned int ret, i, retry = 10;
+ 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,
+ };
+
+ /*
+ * When we issue this command in ATA layer, SCSI layer may also
+ * issue some commands to the ODD. To avoid this command failed
+ * due to defer, retry for several times.
+ */
+ for (i = 0; i < retry; i++) {
+ ret = zpodd_run_atapi_cmd(dev, cdb, sizeof(cdb),
+ buf, sizeof(buf));
+ if (!ret || ret != -EBUSY)
+ break;
+ msleep(20);
+ }
+ 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)
+ ret = 0; /* slot */
+ else if (desc->mech_type == 1 && desc->load == 0 && desc->eject == 1)
+ ret = 1; /* drawer */
+ else
+ ret = -ENODEV;
+
+ return ret;
+}
+
static void zpodd_wake_dev(acpi_handle handle, u32 event, void *context)
{
struct ata_device *ata_dev = context;
@@ -38,10 +114,21 @@ static void zpodd_acpi_remove_pm_notifier(struct ata_device *dev)
void zpodd_init(struct ata_device *dev)
{
struct zpodd *zpodd;
+ int ret;
+
zpodd = kzalloc(sizeof(struct zpodd), GFP_KERNEL);
if (!zpodd)
return;
+ if ((ret = check_loading_mechanism(dev)) == -ENODEV) {
+ kfree(zpodd);
+ return;
+ }
+ if (ret == 0)
+ zpodd->slot = true;
+ else
+ zpodd->drawer = true;
+
zpodd_acpi_add_pm_notifier(dev);
zpodd->dev = dev;
dev->private_data = zpodd;
diff --git a/include/linux/cdrom.h b/include/linux/cdrom.h
index dfd7f18..755f2b4 100644
--- a/include/linux/cdrom.h
+++ b/include/linux/cdrom.h
@@ -806,6 +806,41 @@ struct rwrt_feature_desc {
__u8 reserved3;
};
+/* 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;
+};
+
typedef struct {
__be16 disc_information_length;
#if defined(__BIG_ENDIAN_BITFIELD)
--
1.7.12.4
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