diff options
Diffstat (limited to 'Documentation/ioctl/cdrom.txt')
| -rw-r--r-- | Documentation/ioctl/cdrom.txt | 967 |
1 files changed, 0 insertions, 967 deletions
diff --git a/Documentation/ioctl/cdrom.txt b/Documentation/ioctl/cdrom.txt deleted file mode 100644 index a4d62a9d6771..000000000000 --- a/Documentation/ioctl/cdrom.txt +++ /dev/null @@ -1,967 +0,0 @@ - Summary of CDROM ioctl calls. - ============================ - - Edward A. Falk <efalk@google.com> - - November, 2004 - -This document attempts to describe the ioctl(2) calls supported by -the CDROM layer. These are by-and-large implemented (as of Linux 2.6) -in drivers/cdrom/cdrom.c and drivers/block/scsi_ioctl.c - -ioctl values are listed in <linux/cdrom.h>. As of this writing, they -are as follows: - - CDROMPAUSE Pause Audio Operation - CDROMRESUME Resume paused Audio Operation - CDROMPLAYMSF Play Audio MSF (struct cdrom_msf) - CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti) - CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr) - CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry) - CDROMSTOP Stop the cdrom drive - CDROMSTART Start the cdrom drive - CDROMEJECT Ejects the cdrom media - CDROMVOLCTRL Control output volume (struct cdrom_volctrl) - CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl) - CDROMREADMODE2 Read CDROM mode 2 data (2336 Bytes) - (struct cdrom_read) - CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes) - (struct cdrom_read) - CDROMREADAUDIO (struct cdrom_read_audio) - CDROMEJECT_SW enable(1)/disable(0) auto-ejecting - CDROMMULTISESSION Obtain the start-of-last-session - address of multi session disks - (struct cdrom_multisession) - CDROM_GET_MCN Obtain the "Universal Product Code" - if available (struct cdrom_mcn) - CDROM_GET_UPC Deprecated, use CDROM_GET_MCN instead. - CDROMRESET hard-reset the drive - CDROMVOLREAD Get the drive's volume setting - (struct cdrom_volctrl) - CDROMREADRAW read data in raw mode (2352 Bytes) - (struct cdrom_read) - CDROMREADCOOKED read data in cooked mode - CDROMSEEK seek msf address - CDROMPLAYBLK scsi-cd only, (struct cdrom_blk) - CDROMREADALL read all 2646 bytes - CDROMGETSPINDOWN return 4-bit spindown value - CDROMSETSPINDOWN set 4-bit spindown value - CDROMCLOSETRAY pendant of CDROMEJECT - CDROM_SET_OPTIONS Set behavior options - CDROM_CLEAR_OPTIONS Clear behavior options - CDROM_SELECT_SPEED Set the CD-ROM speed - CDROM_SELECT_DISC Select disc (for juke-boxes) - CDROM_MEDIA_CHANGED Check is media changed - CDROM_DRIVE_STATUS Get tray position, etc. - CDROM_DISC_STATUS Get disc type, etc. - CDROM_CHANGER_NSLOTS Get number of slots - CDROM_LOCKDOOR lock or unlock door - CDROM_DEBUG Turn debug messages on/off - CDROM_GET_CAPABILITY get capabilities - CDROMAUDIOBUFSIZ set the audio buffer size - DVD_READ_STRUCT Read structure - DVD_WRITE_STRUCT Write structure - DVD_AUTH Authentication - CDROM_SEND_PACKET send a packet to the drive - CDROM_NEXT_WRITABLE get next writable block - CDROM_LAST_WRITTEN get last block written on disc - - -The information that follows was determined from reading kernel source -code. It is likely that some corrections will be made over time. - - - - - - - -General: - - Unless otherwise specified, all ioctl calls return 0 on success - and -1 with errno set to an appropriate value on error. (Some - ioctls return non-negative data values.) - - Unless otherwise specified, all ioctl calls return -1 and set - errno to EFAULT on a failed attempt to copy data to or from user - address space. - - Individual drivers may return error codes not listed here. - - Unless otherwise specified, all data structures and constants - are defined in <linux/cdrom.h> - - - - -CDROMPAUSE Pause Audio Operation - - usage: - - ioctl(fd, CDROMPAUSE, 0); - - inputs: none - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - -CDROMRESUME Resume paused Audio Operation - - usage: - - ioctl(fd, CDROMRESUME, 0); - - inputs: none - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - -CDROMPLAYMSF Play Audio MSF (struct cdrom_msf) - - usage: - - struct cdrom_msf msf; - ioctl(fd, CDROMPLAYMSF, &msf); - - inputs: - cdrom_msf structure, describing a segment of music to play - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - notes: - MSF stands for minutes-seconds-frames - LBA stands for logical block address - - Segment is described as start and end times, where each time - is described as minutes:seconds:frames. A frame is 1/75 of - a second. - - -CDROMPLAYTRKIND Play Audio Track/index (struct cdrom_ti) - - usage: - - struct cdrom_ti ti; - ioctl(fd, CDROMPLAYTRKIND, &ti); - - inputs: - cdrom_ti structure, describing a segment of music to play - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - notes: - Segment is described as start and end times, where each time - is described as a track and an index. - - - -CDROMREADTOCHDR Read TOC header (struct cdrom_tochdr) - - usage: - - cdrom_tochdr header; - ioctl(fd, CDROMREADTOCHDR, &header); - - inputs: - cdrom_tochdr structure - - outputs: - cdrom_tochdr structure - - error return: - ENOSYS cd drive not audio-capable. - - - -CDROMREADTOCENTRY Read TOC entry (struct cdrom_tocentry) - - usage: - - struct cdrom_tocentry entry; - ioctl(fd, CDROMREADTOCENTRY, &entry); - - inputs: - cdrom_tocentry structure - - outputs: - cdrom_tocentry structure - - error return: - ENOSYS cd drive not audio-capable. - EINVAL entry.cdte_format not CDROM_MSF or CDROM_LBA - EINVAL requested track out of bounds - EIO I/O error reading TOC - - notes: - TOC stands for Table Of Contents - MSF stands for minutes-seconds-frames - LBA stands for logical block address - - - -CDROMSTOP Stop the cdrom drive - - usage: - - ioctl(fd, CDROMSTOP, 0); - - inputs: none - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - notes: - Exact interpretation of this ioctl depends on the device, - but most seem to spin the drive down. - - -CDROMSTART Start the cdrom drive - - usage: - - ioctl(fd, CDROMSTART, 0); - - inputs: none - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - notes: - Exact interpretation of this ioctl depends on the device, - but most seem to spin the drive up and/or close the tray. - Other devices ignore the ioctl completely. - - -CDROMEJECT Ejects the cdrom media - - usage: - - ioctl(fd, CDROMEJECT, 0); - - inputs: none - - outputs: none - - error returns: - ENOSYS cd drive not capable of ejecting - EBUSY other processes are accessing drive, or door is locked - - notes: - See CDROM_LOCKDOOR, below. - - - -CDROMCLOSETRAY pendant of CDROMEJECT - - usage: - - ioctl(fd, CDROMCLOSETRAY, 0); - - inputs: none - - outputs: none - - error returns: - ENOSYS cd drive not capable of closing the tray - EBUSY other processes are accessing drive, or door is locked - - notes: - See CDROM_LOCKDOOR, below. - - - -CDROMVOLCTRL Control output volume (struct cdrom_volctrl) - - usage: - - struct cdrom_volctrl volume; - ioctl(fd, CDROMVOLCTRL, &volume); - - inputs: - cdrom_volctrl structure containing volumes for up to 4 - channels. - - outputs: none - - error return: - ENOSYS cd drive not audio-capable. - - - -CDROMVOLREAD Get the drive's volume setting - (struct cdrom_volctrl) - - usage: - - struct cdrom_volctrl volume; - ioctl(fd, CDROMVOLREAD, &volume); - - inputs: none - - outputs: - The current volume settings. - - error return: - ENOSYS cd drive not audio-capable. - - - -CDROMSUBCHNL Read subchannel data (struct cdrom_subchnl) - - usage: - - struct cdrom_subchnl q; - ioctl(fd, CDROMSUBCHNL, &q); - - inputs: - cdrom_subchnl structure - - outputs: - cdrom_subchnl structure - - error return: - ENOSYS cd drive not audio-capable. - EINVAL format not CDROM_MSF or CDROM_LBA - - notes: - Format is converted to CDROM_MSF or CDROM_LBA - as per user request on return - - - -CDROMREADRAW read data in raw mode (2352 Bytes) - (struct cdrom_read) - - usage: - - union { - struct cdrom_msf msf; /* input */ - char buffer[CD_FRAMESIZE_RAW]; /* return */ - } arg; - ioctl(fd, CDROMREADRAW, &arg); - - inputs: - cdrom_msf structure indicating an address to read. - Only the start values are significant. - - outputs: - Data written to address provided by user. - - error return: - EINVAL address less than 0, or msf less than 0:2:0 - ENOMEM out of memory - - notes: - As of 2.6.8.1, comments in <linux/cdrom.h> indicate that this - ioctl accepts a cdrom_read structure, but actual source code - reads a cdrom_msf structure and writes a buffer of data to - the same address. - - MSF values are converted to LBA values via this formula: - - lba = (((m * CD_SECS) + s) * CD_FRAMES + f) - CD_MSF_OFFSET; - - - - -CDROMREADMODE1 Read CDROM mode 1 data (2048 Bytes) - (struct cdrom_read) - - notes: - Identical to CDROMREADRAW except that block size is - CD_FRAMESIZE (2048) bytes - - - -CDROMREADMODE2 Read CDROM mode 2 data (2336 Bytes) - (struct cdrom_read) - - notes: - Identical to CDROMREADRAW except that block size is - CD_FRAMESIZE_RAW0 (2336) bytes - - - -CDROMREADAUDIO (struct cdrom_read_audio) - - usage: - - struct cdrom_read_audio ra; - ioctl(fd, CDROMREADAUDIO, &ra); - - inputs: - cdrom_read_audio structure containing read start - point and length - - outputs: - audio data, returned to buffer indicated by ra - - error return: - EINVAL format not CDROM_MSF or CDROM_LBA - EINVAL nframes not in range [1 75] - ENXIO drive has no queue (probably means invalid fd) - ENOMEM out of memory - - -CDROMEJECT_SW enable(1)/disable(0) auto-ejecting - - usage: - - int val; - ioctl(fd, CDROMEJECT_SW, val); - - inputs: - Flag specifying auto-eject flag. - - outputs: none - - error return: - ENOSYS Drive is not capable of ejecting. - EBUSY Door is locked - - - - -CDROMMULTISESSION Obtain the start-of-last-session - address of multi session disks - (struct cdrom_multisession) - usage: - - struct cdrom_multisession ms_info; - ioctl(fd, CDROMMULTISESSION, &ms_info); - - inputs: - cdrom_multisession structure containing desired - format. - - outputs: - cdrom_multisession structure is filled with last_session - information. - - error return: - EINVAL format not CDROM_MSF or CDROM_LBA - - -CDROM_GET_MCN Obtain the "Universal Product Code" - if available (struct cdrom_mcn) - - usage: - - struct cdrom_mcn mcn; - ioctl(fd, CDROM_GET_MCN, &mcn); - - inputs: none - - outputs: - Universal Product Code - - error return: - ENOSYS Drive is not capable of reading MCN data. - - notes: - Source code comments state: - - The following function is implemented, although very few - audio discs give Universal Product Code information, which - should just be the Medium Catalog Number on the box. Note, - that the way the code is written on the CD is /not/ uniform - across all discs! - - - - -CDROM_GET_UPC CDROM_GET_MCN (deprecated) - - Not implemented, as of 2.6.8.1 - - - -CDROMRESET hard-reset the drive - - usage: - - ioctl(fd, CDROMRESET, 0); - - inputs: none - - outputs: none - - error return: - EACCES Access denied: requires CAP_SYS_ADMIN - ENOSYS Drive is not capable of resetting. - - - - -CDROMREADCOOKED read data in cooked mode - - usage: - - u8 buffer[CD_FRAMESIZE] - ioctl(fd, CDROMREADCOOKED, buffer); - - inputs: none - - outputs: - 2048 bytes of data, "cooked" mode. - - notes: - Not implemented on all drives. - - - - -CDROMREADALL read all 2646 bytes - - Same as CDROMREADCOOKED, but reads 2646 bytes. - - - -CDROMSEEK seek msf address - - usage: - - struct cdrom_msf msf; - ioctl(fd, CDROMSEEK, &msf); - - inputs: - MSF address to seek to. - - outputs: none - - - -CDROMPLAYBLK scsi-cd only, (struct cdrom_blk) - - usage: - - struct cdrom_blk blk; - ioctl(fd, CDROMPLAYBLK, &blk); - - inputs: - Region to play - - outputs: none - - - -CDROMGETSPINDOWN - - usage: - - char spindown; - ioctl(fd, CDROMGETSPINDOWN, &spindown); - - inputs: none - - outputs: - The value of the current 4-bit spindown value. - - - - -CDROMSETSPINDOWN - - usage: - - char spindown - ioctl(fd, CDROMSETSPINDOWN, &spindown); - - inputs: - 4-bit value used to control spindown (TODO: more detail here) - - outputs: none - - - - - -CDROM_SET_OPTIONS Set behavior options - - usage: - - int options; - ioctl(fd, CDROM_SET_OPTIONS, options); - - inputs: - New values for drive options. The logical 'or' of: - CDO_AUTO_CLOSE close tray on first open(2) - CDO_AUTO_EJECT open tray on last release - CDO_USE_FFLAGS use O_NONBLOCK information on open - CDO_LOCK lock tray on open files - CDO_CHECK_TYPE check type on open for data - - outputs: - Returns the resulting options settings in the - ioctl return value. Returns -1 on error. - - error return: - ENOSYS selected option(s) not supported by drive. - - - - -CDROM_CLEAR_OPTIONS Clear behavior options - - Same as CDROM_SET_OPTIONS, except that selected options are - turned off. - - - -CDROM_SELECT_SPEED Set the CD-ROM speed - - usage: - - int speed; - ioctl(fd, CDROM_SELECT_SPEED, speed); - - inputs: - New drive speed. - - outputs: none - - error return: - ENOSYS speed selection not supported by drive. - - - -CDROM_SELECT_DISC Select disc (for juke-boxes) - - usage: - - int disk; - ioctl(fd, CDROM_SELECT_DISC, disk); - - inputs: - Disk to load into drive. - - outputs: none - - error return: - EINVAL Disk number beyond capacity of drive - - - -CDROM_MEDIA_CHANGED Check is media changed - - usage: - - int slot; - ioctl(fd, CDROM_MEDIA_CHANGED, slot); - - inputs: - Slot number to be tested, always zero except for jukeboxes. - May also be special values CDSL_NONE or CDSL_CURRENT - - outputs: - Ioctl return value is 0 or 1 depending on whether the media - has been changed, or -1 on error. - - error returns: - ENOSYS Drive can't detect media change - EINVAL Slot number beyond capacity of drive - ENOMEM Out of memory - - - -CDROM_DRIVE_STATUS Get tray position, etc. - - usage: - - int slot; - ioctl(fd, CDROM_DRIVE_STATUS, slot); - - inputs: - Slot number to be tested, always zero except for jukeboxes. - May also be special values CDSL_NONE or CDSL_CURRENT - - outputs: - Ioctl return value will be one of the following values - from <linux/cdrom.h>: - - CDS_NO_INFO Information not available. - CDS_NO_DISC - CDS_TRAY_OPEN - CDS_DRIVE_NOT_READY - CDS_DISC_OK - -1 error - - error returns: - ENOSYS Drive can't detect drive status - EINVAL Slot number beyond capacity of drive - ENOMEM Out of memory - - - - -CDROM_DISC_STATUS Get disc type, etc. - - usage: - - ioctl(fd, CDROM_DISC_STATUS, 0); - - inputs: none - - outputs: - Ioctl return value will be one of the following values - from <linux/cdrom.h>: - CDS_NO_INFO - CDS_AUDIO - CDS_MIXED - CDS_XA_2_2 - CDS_XA_2_1 - CDS_DATA_1 - - error returns: none at present - - notes: - Source code comments state: - - Ok, this is where problems start. The current interface for - the CDROM_DISC_STATUS ioctl is flawed. It makes the false - assumption that CDs are all CDS_DATA_1 or all CDS_AUDIO, etc. - Unfortunately, while this is often the case, it is also - very common for CDs to have some tracks with data, and some - tracks with audio. Just because I feel like it, I declare - the following to be the best way to cope. If the CD has - ANY data tracks on it, it will be returned as a data CD. - If it has any XA tracks, I will return it as that. Now I - could simplify this interface by combining these returns with - the above, but this more clearly demonstrates the problem - with the current interface. Too bad this wasn't designed - to use bitmasks... -Erik - - Well, now we have the option CDS_MIXED: a mixed-type CD. - User level programmers might feel the ioctl is not very - useful. - ---david - - - - -CDROM_CHANGER_NSLOTS Get number of slots - - usage: - - ioctl(fd, CDROM_CHANGER_NSLOTS, 0); - - inputs: none - - outputs: - The ioctl return value will be the number of slots in a - CD changer. Typically 1 for non-multi-disk devices. - - error returns: none - - - -CDROM_LOCKDOOR lock or unlock door - - usage: - - int lock; - ioctl(fd, CDROM_LOCKDOOR, lock); - - inputs: - Door lock flag, 1=lock, 0=unlock - - outputs: none - - error returns: - EDRIVE_CANT_DO_THIS Door lock function not supported. - EBUSY Attempt to unlock when multiple users - have the drive open and not CAP_SYS_ADMIN - - notes: - As of 2.6.8.1, the lock flag is a global lock, meaning that - all CD drives will be locked or unlocked together. This is - probably a bug. - - The EDRIVE_CANT_DO_THIS value is defined in <linux/cdrom.h> - and is currently (2.6.8.1) the same as EOPNOTSUPP - - - -CDROM_DEBUG Turn debug messages on/off - - usage: - - int debug; - ioctl(fd, CDROM_DEBUG, debug); - - inputs: - Cdrom debug flag, 0=disable, 1=enable - - outputs: - The ioctl return value will be the new debug flag. - - error return: - EACCES Access denied: requires CAP_SYS_ADMIN - - - -CDROM_GET_CAPABILITY get capabilities - - usage: - - ioctl(fd, CDROM_GET_CAPABILITY, 0); - - inputs: none - - outputs: - The ioctl return value is the current device capability - flags. See CDC_CLOSE_TRAY, CDC_OPEN_TRAY, etc. - - - -CDROMAUDIOBUFSIZ set the audio buffer size - - usage: - - int arg; - ioctl(fd, CDROMAUDIOBUFSIZ, val); - - inputs: - New audio buffer size - - outputs: - The ioctl return value is the new audio buffer size, or -1 - on error. - - error return: - ENOSYS Not supported by this driver. - - notes: - Not supported by all drivers. - - - -DVD_READ_STRUCT Read structure - - usage: - - dvd_struct s; - ioctl(fd, DVD_READ_STRUCT, &s); - - inputs: - dvd_struct structure, containing: - type specifies the information desired, one of - DVD_STRUCT_PHYSICAL, DVD_STRUCT_COPYRIGHT, - DVD_STRUCT_DISCKEY, DVD_STRUCT_BCA, - DVD_STRUCT_MANUFACT - physical.layer_num desired layer, indexed from 0 - copyright.layer_num desired layer, indexed from 0 - disckey.agid - - outputs: - dvd_struct structure, containing: - physical for type == DVD_STRUCT_PHYSICAL - copyright for type == DVD_STRUCT_COPYRIGHT - disckey.value for type == DVD_STRUCT_DISCKEY - bca.{len,value} for type == DVD_STRUCT_BCA - manufact.{len,valu} for type == DVD_STRUCT_MANUFACT - - error returns: - EINVAL physical.layer_num exceeds number of layers - EIO Received invalid response from drive - - - -DVD_WRITE_STRUCT Write structure - - Not implemented, as of 2.6.8.1 - - - -DVD_AUTH Authentication - - usage: - - dvd_authinfo ai; - ioctl(fd, DVD_AUTH, &ai); - - inputs: - dvd_authinfo structure. See <linux/cdrom.h> - - outputs: - dvd_authinfo structure. - - error return: - ENOTTY ai.type not recognized. - - - -CDROM_SEND_PACKET send a packet to the drive - - usage: - - struct cdrom_generic_command cgc; - ioctl(fd, CDROM_SEND_PACKET, &cgc); - - inputs: - cdrom_generic_command structure containing the packet to send. - - outputs: none - cdrom_generic_command structure containing results. - - error return: - EIO command failed. - EPERM Operation not permitted, either because a - write command was attempted on a drive which - is opened read-only, or because the command - requires CAP_SYS_RAWIO - EINVAL cgc.data_direction not set - - - -CDROM_NEXT_WRITABLE get next writable block - - usage: - - long next; - ioctl(fd, CDROM_NEXT_WRITABLE, &next); - - inputs: none - - outputs: - The next writable block. - - notes: - If the device does not support this ioctl directly, the - ioctl will return CDROM_LAST_WRITTEN + 7. - - - -CDROM_LAST_WRITTEN get last block written on disc - - usage: - - long last; - ioctl(fd, CDROM_LAST_WRITTEN, &last); - - inputs: none - - outputs: - The last block written on disc - - notes: - If the device does not support this ioctl directly, the - result is derived from the disc's table of contents. If the - table of contents can't be read, this ioctl returns an - error. |