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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-02-01 23:09:24 +0100
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-02-01 23:09:24 +0100
commita1bb9457f06439f22571e93bddcca63144a08296 (patch)
treec4b250183a7b552918fb0b001205d0b81b8ca46d /include/linux/cdrom.h
parent5c68429dfe8256c6069555e5851838f8e3175f78 (diff)
downloadlwn-a1bb9457f06439f22571e93bddcca63144a08296.tar.gz
lwn-a1bb9457f06439f22571e93bddcca63144a08296.zip
ide-cd: move lba_to_msf() and msf_to_lba() to <linux/cdrom.h>
* Move lba_to_msf() and msf_to_lba() to <linux/cdrom.h> (use 'u8' type instead of 'byte' while at it). * Remove msf_to_lba() copy from drivers/cdrom/cdrom.c. Acked-by: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'include/linux/cdrom.h')
-rw-r--r--include/linux/cdrom.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/linux/cdrom.h b/include/linux/cdrom.h
index fcdc11b9609b..a5cd2047624e 100644
--- a/include/linux/cdrom.h
+++ b/include/linux/cdrom.h
@@ -1187,6 +1187,20 @@ struct media_event_desc {
extern int cdrom_get_media_event(struct cdrom_device_info *cdi, struct media_event_desc *med);
+static inline void lba_to_msf(int lba, u8 *m, u8 *s, u8 *f)
+{
+ lba += CD_MSF_OFFSET;
+ lba &= 0xffffff; /* negative lbas use only 24 bits */
+ *m = lba / (CD_SECS * CD_FRAMES);
+ lba %= (CD_SECS * CD_FRAMES);
+ *s = lba / CD_FRAMES;
+ *f = lba % CD_FRAMES;
+}
+
+static inline int msf_to_lba(u8 m, u8 s, u8 f)
+{
+ return (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET;
+}
#endif /* End of kernel only stuff */
#endif /* _LINUX_CDROM_H */