From d83dfabe0d75d0c5dd322f05abc1f04d2ca5be6c Mon Sep 17 00:00:00 2001 From: Jan Drzewiecki Date: Sun, 8 Aug 2010 17:57:47 +0200 Subject: [PATCH] cdrom_id: Handle pre-MMC2 drives Those do not yet support the 0x46 "GET CONFIGURATION" support. If we have those, fall back to the 0x51 "READ DISC INFORMATION" call. This can only differentiate between CD-RW and CD-R, but first that's better than a complete detection failure, and second, those old drives likely don't support more modern media in the first place. https://launchpad.net/bugs/502143 Signed-off-by: Martin Pitt --- extras/cdrom_id/cdrom_id.c | 41 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) diff --git a/extras/cdrom_id/cdrom_id.c b/extras/cdrom_id/cdrom_id.c index 9c4f6f31b..650020622 100644 --- a/extras/cdrom_id/cdrom_id.c +++ b/extras/cdrom_id/cdrom_id.c @@ -348,6 +348,41 @@ static int feature_profiles(struct udev *udev, const unsigned char *profiles, si return 0; } +static int cd_profiles_old_mmc(struct udev *udev, int fd) +{ + struct scsi_cmd sc; + int err; + + unsigned char header[32]; + + scsi_cmd_init(udev, &sc, header, sizeof(header)); + scsi_cmd_set(udev, &sc, 0, 0x51); + scsi_cmd_set(udev, &sc, 8, sizeof(header)); + scsi_cmd_set(udev, &sc, 9, 0); + err = scsi_cmd_run(udev, &sc, fd, header, sizeof(header)); + if ((err != 0)) { + info_scsi_cmd_err(udev, "READ DISC INFORMATION", err); + info(udev, "no current profile, assuming no media\n"); + return -1; + }; + + cd_media = 1; + + if (header[2] & 16) { + cd_media_cd_rw = 1; + info(udev, "profile 0x0a media_cd_rw\n"); + } + else if ((header[2] & 3) < 2 && cd_cd_r) { + cd_media_cd_r = 1; + info(udev, "profile 0x09 media_cd_r\n"); + } + else { + cd_media_cd_rom = 1; + info(udev, "profile 0x08 media_cd_rom\n"); + } + return 0; +} + static int cd_profiles(struct udev *udev, int fd) { struct scsi_cmd sc; @@ -365,6 +400,12 @@ static int cd_profiles(struct udev *udev, int fd) err = scsi_cmd_run(udev, &sc, fd, features, sizeof(features)); if ((err != 0)) { info_scsi_cmd_err(udev, "GET CONFIGURATION", err); + /* handle pre-MMC2 drives which do not support GET CONFIGURATION */ + if (SK(err) == 0x5 && ASC(err) == 0x20) { + info(udev, "drive is pre-MMC2 and does not support 46h get configuration command\n"); + info(udev, "trying to work around the problem\n"); + return cd_profiles_old_mmc(udev, fd); + } return -1; } -- 2.30.2