Adds the SCSI Read Disc Information command, which should be given for
multimedia device consumers to retrieve the DVD/BD disk information
about:
* Total tracks contained at the disc Total and active sessions Border
* status(incomplete, damaged, etc.)
This information is wanted for supporting the DVD-ROM and BD-ROM
devices.
End-user-impact: Now, multimedia device consumers have a way to retrieve
the multimedia disk information.
Signed-off-by: Igor Kononenko <i.kononenko@xxxxxxxxx>
---
drivers/usb/gadget/function/f_mass_storage.c | 37 ++++
include/scsi/scsi_proto.h | 1 +
include/uapi/linux/cdrom.h | 195 +++++++++++++++++--
3 files changed, 212 insertions(+), 21 deletions(-)
diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c
index 7e736e5594f9..d3d8a806b5e6 100644
--- a/drivers/usb/gadget/function/f_mass_storage.c
+++ b/drivers/usb/gadget/function/f_mass_storage.c
@@ -1932,6 +1932,40 @@ static void send_status(struct fsg_common *common)
return;
}
+static int do_read_disc_info(struct fsg_common *common, struct fsg_buffhd *bh)
+{
+ struct fsg_lun *curlun = common->curlun;
+ struct cdb_disc_info *cdb = (struct cdb_disc_info *)common->cmnd;
+ disc_information *info = (disc_information *)bh->buf;
+
+ if (cdb->type != DISC_TYPE_STANDARD) {
+ LERROR(curlun,
+ "Unsupported disc information type(%02Xh) requested\n",
+ cdb->type);
+ return -EINVAL;
+ }
+ memset(info, 0, sizeof(disc_information));
+ info->disc_information_length = cpu_to_be16(
+ sizeof(*info) - sizeof(info->disc_information_length));
+
+ info->border_status = DISC_LAST_SESS_COMPLETE;
+ info->disc_status = DISC_STATUS_FINALIZED;
+
+ /* We only support one session per disk */
+ info->n_first_track = 1;
+ info->n_sessions_lsb = 1;
+ info->first_track_lsb = 1;
+ info->last_track_lsb = 1;
+
+ /* Setting the unrestricted use because we only support (CD/DVD/BD)-ROM */
+ info->uru = 1;
+
+ info->disc_type = DISC_FIELD_DA_ROM;
+
+ common->data_size_to_handle = sizeof(*info);
+ return 0;
+}
+
/**
* Attempts to guess medium type by looking at the length of the disc layout.
*/
@@ -2253,6 +2287,8 @@ static struct cdb_command_check cdb_checker_table[] = {
{ CDB_REG_CHECKER(TEST_UNIT_READY, 6, CDB_NO_SIZE_FIELD, DATA_DIR_NONE,
0x0000, MEDIUM_REQUIRED) },
+ { CDB_REG_NO_CHECKER(READ_DISC_INFORMATION, CDB_SIZE_FIELD_7,
+ DATA_DIR_TO_HOST, MEDIUM_REQUIRED) },
{ CDB_REG_NO_CHECKER(GET_CONFIGURATION, CDB_SIZE_FIELD_7,
DATA_DIR_TO_HOST, MEDIUM_REQUIRED) },
@@ -2286,6 +2322,7 @@ static struct cdb_handler cdb_handlers_table[] = {
{ CDB_REG_HANDLER(SYNCHRONIZE_CACHE, &do_synchronize_cache) },
{ CDB_REG_HANDLER(TEST_UNIT_READY, NULL) },
+ { CDB_REG_HANDLER_BUFFHD(READ_DISC_INFORMATION, &do_read_disc_info) },
{ CDB_REG_HANDLER_BUFFHD(GET_CONFIGURATION, &do_get_configuration) },
/*
* Although optional, this command is used by MS-Windows. We
diff --git a/include/scsi/scsi_proto.h b/include/scsi/scsi_proto.h
index 6b2a8ee1f0a3..6728fcbd73e4 100644
--- a/include/scsi/scsi_proto.h
+++ b/include/scsi/scsi_proto.h
@@ -77,6 +77,7 @@
#define GET_EVENT_STATUS_NOTIFICATION 0x4a
#define LOG_SELECT 0x4c
#define LOG_SENSE 0x4d
+#define READ_DISC_INFORMATION 0x51
#define XDWRITEREAD_10 0x53
#define MODE_SELECT_10 0x55
#define RESERVE_10 0x56
diff --git a/include/uapi/linux/cdrom.h b/include/uapi/linux/cdrom.h
index 442693fdc059..460377e1a532 100644
--- a/include/uapi/linux/cdrom.h
+++ b/include/uapi/linux/cdrom.h
@@ -816,51 +816,204 @@ struct rwrt_feature_desc {
__u8 reserved3;
};
+/* Disc Information Data Types */
+#define DISC_TYPE_STANDARD (0x00U)
+#define DISC_TYPE_TRACK (0x01U)
+#define DISC_TYPE_POW (0x02U)
+
+/* Disc Status */
+#define DISC_STATUS_EMPTY (0x00U)
+#define DISC_STATUS_INCOMPLETE (0x01U)
+#define DISC_STATUS_FINALIZED (0x02U)
+#define DISC_STATUS_OTHER (0x03U)
+
+/* State of Last Session */
+#define DISC_LAST_SESS_EMPTY (0x00U)
+#define DISC_LAST_SESS_INCOMPLETE (0x01U)
+#define DISC_LAST_SESS_DAMAGED (0x02U)
+#define DISC_LAST_SESS_COMPLETE (0x03U)
+
+/* Background Format Status Codes */
+#define DISC_BACK_FMT_NEITHER (0x00U)
+#define DISC_BACK_FMT_STARTED (0x01U)
+#define DISC_BACK_FMT_PROGRESS (0x02U)
+#define DISC_BACK_FMT_COMPLETED (0x03U)
+
+/* Disc Type Field */
+#define DISC_FIELD_DA_ROM (0x00U)
+#define DISC_FIELD_I (0x10U)
+#define DISC_FIELD_ROM_XA (0x20U)
+#define DISC_FIELD_UNDEF (0xFFU)
+
+/**
+ * @brief The READ DISC INFORMATION CDB(0051h)
+ * The READ DISC INFORMATION command allows the Host to request information about
+ * the currently mounted MM disc.
+ */
+struct cdb_disc_info {
+ __u8 code;
+
+#if defined(__BIG_ENDIAN_BITFIELD)
+ __u8 reserved1 : 5;
+ /**
+ * When a disc is present, Data Type defines the specific information requested
+ */
+ __u8 type : 3;
+#elif defined(__LITTLE_ENDIAN_BITFIELD)
+ __u8 type : 3;
+ __u8 reserved1 : 5;
+#endif
+
+ __u8 reserved2[5];
+
+ __be16 length;
+
+ __u8 control;
+} __packed;
+
typedef struct {
__be16 disc_information_length;
#if defined(__BIG_ENDIAN_BITFIELD)
- __u8 reserved1 : 3;
- __u8 erasable : 1;
- __u8 border_status : 2;
- __u8 disc_status : 2;
+ /**
+ * The Disc Information Data Type field shall be set to the reported
+ * Disc Information Type
+ */
+ __u8 info_data_type : 3;
+ /**
+ * The Erasable bit, when set to one, indicates that CD-RW, DVD-RAM, DVD-RW, DVD+RW,
+ * HD DVD-RAM, or BD-RE media is present and the Drive is capable of writing the media.
+ * If the Erasable bit is set to zero, then either the medium is not erasable or the
+ * Drive is unable to write the media.
+ */
+ __u8 erasable : 1;
+ /**
+ * The State of Last Session field specifies the recorded state of the last
+ * session, regardless of the number of sessions on the disc.
+ */
+ __u8 border_status : 2;
+ /* The Disc Status field indicates the recorded status of the disc */
+ __u8 disc_status : 2;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
- __u8 disc_status : 2;
- __u8 border_status : 2;
- __u8 erasable : 1;
- __u8 reserved1 : 3;
+ __u8 disc_status : 2;
+ __u8 border_status : 2;
+ __u8 erasable : 1;
+ __u8 info_data_type : 3;
#else
#error "Please fix <asm/byteorder.h>"
#endif
+ /**
+ * The Number of First Track on Disc is the track number of the Logical Track that
+ * contains LBA 0
+ */
__u8 n_first_track;
__u8 n_sessions_lsb;
+ /**
+ * First Track Number in Last Session (bytes 5 & 10) is the track number of the
+ * first Logical Track in the last session.
+ * This includes the incomplete logical track.
+ */
__u8 first_track_lsb;
+ /**
+ * Last Track Number in Last Session (bytes 6 & 11) is the track number of the last
+ * Logical Track in the last session.
+ * This includes the incomplete logical track.
+ */
__u8 last_track_lsb;
#if defined(__BIG_ENDIAN_BITFIELD)
- __u8 did_v : 1;
- __u8 dbc_v : 1;
- __u8 uru : 1;
- __u8 reserved2 : 2;
- __u8 dbit : 1;
- __u8 mrw_status : 2;
+ /**
+ * The DID_V (Disc ID Valid) bit, when set to one, indicates that the Disc
+ * Identification field is valid
+ */
+ __u8 did_v : 1;
+ /**
+ * The DBC_V (Disc Bar Code Valid bit, when set to one, indicates that the Disc Bar
+ * Code field (bytes 24 through 31) is valid
+ */
+ __u8 dbc_v : 1;
+ /**
+ * The URU (Unrestricted Use Disc) bit may be zero for special use CD-R, CD-RW,
+ * or DVD-R, medium.
+ * For all other media types, URU shall be set to one. When URU is zero, the mounted
+ * disc is defined for restricted use.
+ */
+ __u8 uru : 1;
+ /**
+ * DAC_V indicates the validity of the Disc Application Code in byte 32. If DAC_V is
+ * set to zero, then the Disc Application Code is not valid. If DAC_V is set to one,
+ * the Disc Application Code is valid.
+ */
+ __u8 dac_v: 1;
+ __u8 reserved2 : 1;
+ /**
+ * If the disc is MRW formatted or MRW formatting (state = 01b, 10b, or 11b),
+ * then bit 2 of byte 7 (Dbit) is a copy of the “dirty bit” from the defect table.
+ * If Dbit is set to zero, then the MRW structures are current.
+ * If Dbit is set to one, then the MRW structures may not be current.
+ * When BG format status = 00b, Dbit shall be set to zero.
+ */
+ __u8 dbit : 1;
+ /**
+ * The BG format status is the background format status of the mounted disc.
+ * Drives that report the Formattable Feature and either the MRW Feature or the DVD+RW
+ * Feature, or both are required to implement Background format.
+ * For all other Drives, this field shall be @param DISC_BACK_FMT_NEITHER.
+ */
+ __u8 mrw_status : 2;
#elif defined(__LITTLE_ENDIAN_BITFIELD)
- __u8 mrw_status : 2;
- __u8 dbit : 1;
- __u8 reserved2 : 2;
- __u8 uru : 1;
- __u8 dbc_v : 1;
- __u8 did_v : 1;
+ __u8 mrw_status : 2;
+ __u8 dbit : 1;
+ __u8 reserved2 : 1;
+ __u8 dac_v: 1;
+ __u8 uru : 1;
+ __u8 dbc_v : 1;
+ __u8 did_v : 1;
#endif
+ /**
+ * The Disc Type field is associated only with CD media type
+ */
__u8 disc_type;
__u8 n_sessions_msb;
__u8 first_track_msb;
__u8 last_track_msb;
+
+ /**
+ * For CD-R/RW, the Disc Identification number recorded in the PMA is returned.
+ * The Disc Identification Number is recorded in the PMA as a six-digit BCD number.
+ * It is returned in the Disc Information Block as a 32 bit binary integer.
+ * This value should be zero filled for all other media types.
+ */
__u32 disc_id;
+ /**
+ * The Last Session Lead-in Start Address field is dependent on medium and
+ * recorded status.
+ */
__u32 lead_in;
+ /**
+ * The Last Possible Lead-out Start Address field is dependent on medium and
+ * recorded status.
+ */
__u32 lead_out;
+ /**
+ * For CD, the Disc Bar Code field contains the hexadecimal value of the bar code
+ * if the Drive has the ability to read Disc Bar Code and a bar code is present.
+ * For all other media this field should be set to zeros.
+ */
__u8 disc_bar_code[8];
+ /**
+ *
+ */
__u8 reserved3;
+ /**
+ * The Number of OPC Tables field is the number of OPC tables that follow this field.
+ * If OPC has not been determined for the currently mounted medium, the Number of
+ * OPC Tables field is set to zero.
+ * The Number of OPC Tables represents the number of disc speeds for which the OPC
+ * values are known.
+ * Since each OPC Table is 8 bytes in length, then the number of bytes that follow
+ * the Number of OPC Tables field is 8 x Number of OPC Tables.
+ */
__u8 n_opc;
-} disc_information;
+} __packed disc_information;
typedef struct {
__be16 track_information_length;
--
2.32.0
