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authorRoger Quadros <roger.quadros@nokia.com>2022-01-24 19:01:50 +0300
committerJoel Stanley <joel@jms.id.au>2022-03-21 05:54:32 +0300
commitc1d6a701f54aaf27b81ccbcac866a5872335915f (patch)
tree928fd516d1a52b0e57d6d555127611f1c4c12fbb /drivers/usb
parent7d5a793e977ad257402e6f5c27d5e78980ecae51 (diff)
downloadlinux-c1d6a701f54aaf27b81ccbcac866a5872335915f.tar.xz
usb: gadget: f_mass_storage: Make CD-ROM emulation work with Mac OS-X
Mac OS-X expects CD-ROM TOC in raw format (i.e. format:2). It also sends the READ_TOC CDB in old style SFF8020i format. i.e. 2 format bits are encoded in MSBs of CDB byte 9. This patch will enable CD-ROM emulation to work with Mac OS-X. Tested on Mac OS X v10.6.3. Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Roger Quadros <roger.quadros@nokia.com> Signed-off-by: Jack Pham <quic_jackp@quicinc.com> Link: https://lore.kernel.org/r/20220124160150.19499-1-quic_jackp@quicinc.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Joel Stanley <joel@jms.id.au>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/function/f_mass_storage.c70
1 files changed, 58 insertions, 12 deletions
diff --git a/drivers/usb/gadget/function/f_mass_storage.c b/drivers/usb/gadget/function/f_mass_storage.c
index 6ad669dde41c..1e1e5c5fdafb 100644
--- a/drivers/usb/gadget/function/f_mass_storage.c
+++ b/drivers/usb/gadget/function/f_mass_storage.c
@@ -1156,6 +1156,8 @@ static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh)
int msf = common->cmnd[1] & 0x02;
int start_track = common->cmnd[6];
u8 *buf = (u8 *)bh->buf;
+ u8 format;
+ int i, len;
if ((common->cmnd[1] & ~0x02) != 0 || /* Mask away MSF */
start_track > 1) {
@@ -1163,18 +1165,62 @@ static int do_read_toc(struct fsg_common *common, struct fsg_buffhd *bh)
return -EINVAL;
}
- memset(buf, 0, 20);
- buf[1] = (20-2); /* TOC data length */
- buf[2] = 1; /* First track number */
- buf[3] = 1; /* Last track number */
- buf[5] = 0x16; /* Data track, copying allowed */
- buf[6] = 0x01; /* Only track is number 1 */
- store_cdrom_address(&buf[8], msf, 0);
+ format = common->cmnd[2] & 0xf;
+ /*
+ * Check if CDB is old style SFF-8020i
+ * i.e. format is in 2 MSBs of byte 9
+ * Mac OS-X host sends us this.
+ */
+ if (format == 0)
+ format = (common->cmnd[9] >> 6) & 0x3;
+
+ switch (format) {
+ case 0:
+ /* Formatted TOC */
+ len = 4 + 2*8; /* 4 byte header + 2 descriptors */
+ memset(buf, 0, len);
+ buf[1] = len - 2; /* TOC Length excludes length field */
+ buf[2] = 1; /* First track number */
+ buf[3] = 1; /* Last track number */
+ buf[5] = 0x16; /* Data track, copying allowed */
+ buf[6] = 0x01; /* Only track is number 1 */
+ store_cdrom_address(&buf[8], msf, 0);
+
+ buf[13] = 0x16; /* Lead-out track is data */
+ buf[14] = 0xAA; /* Lead-out track number */
+ store_cdrom_address(&buf[16], msf, curlun->num_sectors);
+ return len;
+
+ case 2:
+ /* Raw TOC */
+ len = 4 + 3*11; /* 4 byte header + 3 descriptors */
+ memset(buf, 0, len); /* Header + A0, A1 & A2 descriptors */
+ buf[1] = len - 2; /* TOC Length excludes length field */
+ buf[2] = 1; /* First complete session */
+ buf[3] = 1; /* Last complete session */
+
+ buf += 4;
+ /* fill in A0, A1 and A2 points */
+ for (i = 0; i < 3; i++) {
+ buf[0] = 1; /* Session number */
+ buf[1] = 0x16; /* Data track, copying allowed */
+ /* 2 - Track number 0 -> TOC */
+ buf[3] = 0xA0 + i; /* A0, A1, A2 point */
+ /* 4, 5, 6 - Min, sec, frame is zero */
+ buf[8] = 1; /* Pmin: last track number */
+ buf += 11; /* go to next track descriptor */
+ }
+ buf -= 11; /* go back to A2 descriptor */
- buf[13] = 0x16; /* Lead-out track is data */
- buf[14] = 0xAA; /* Lead-out track number */
- store_cdrom_address(&buf[16], msf, curlun->num_sectors);
- return 20;
+ /* For A2, 7, 8, 9, 10 - zero, Pmin, Psec, Pframe of Lead out */
+ store_cdrom_address(&buf[7], msf, curlun->num_sectors);
+ return len;
+
+ default:
+ /* Multi-session, PMA, ATIP, CD-TEXT not supported/required */
+ curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
+ return -EINVAL;
+ }
}
static int do_mode_sense(struct fsg_common *common, struct fsg_buffhd *bh)
@@ -1901,7 +1947,7 @@ static int do_scsi_command(struct fsg_common *common)
common->data_size_from_cmnd =
get_unaligned_be16(&common->cmnd[7]);
reply = check_command(common, 10, DATA_DIR_TO_HOST,
- (7<<6) | (1<<1), 1,
+ (0xf<<6) | (3<<1), 1,
"READ TOC");
if (reply == 0)
reply = do_read_toc(common, bh);