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199 |
simons |
/* cdrom.c. Common ioctl and open routines for various Linux cdrom drivers. -*- linux-c -*-
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Copyright (c) 1996 David van Leeuwen.
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The routines in the file should provide an interface between
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software accessing cdroms and the various drivers that implement
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specific hardware devices.
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*/
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/major.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <asm/fcntl.h>
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#include <linux/cdrom.h>
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#include <linux/ucdrom.h>
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#define FM_WRITE 0x2 /* file mode write bit */
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#define VERSION "$Id: cdrom.c,v 1.1.1.1 2001-09-10 07:44:13 simons Exp $"
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/* Not-exported routines. */
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int cdrom_open(struct inode *ip, struct file *fp);
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void cdrom_release(struct inode *ip, struct file *fp);
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int cdrom_ioctl(struct inode *ip, struct file *fp,
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unsigned int cmd, unsigned long arg);
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int cdrom_media_changed(kdev_t dev);
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struct file_operations cdrom_fops =
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{
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NULL, /* lseek */
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block_read, /* read - general block-dev read */
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block_write, /* write - general block-dev write */
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NULL, /* readdir */
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NULL, /* select */
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cdrom_ioctl, /* ioctl */
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NULL, /* mmap */
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cdrom_open, /* open */
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cdrom_release, /* release */
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NULL, /* fsync */
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NULL, /* fasync */
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cdrom_media_changed, /* media_change */
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NULL /* revalidate */
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};
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static struct cdrom_device_ops *cdromdevs[MAX_BLKDEV] = {
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NULL,
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};
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/* This macro makes sure we don't have to check on cdrom_device_ops
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* existence in the run-time routines below. Change_capability is a
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* hack to have the capability flags defined const, while we can still
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* change it here without gcc complaining at every line.
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*/
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#define ENSURE(call, bits) if (cdo->call == NULL) *change_capability &= ~(bits)
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/* We don't use $name$ yet, but it could be used for the /proc
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* filesystem in the future, or for other purposes.
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*/
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int register_cdrom(int major, char *name, struct cdrom_device_ops *cdo)
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{
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int *change_capability = &cdo->capability; /* hack, gcc complains OK */
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if (major < 0 || major >= MAX_BLKDEV)
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return -1;
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if (cdo->open_files == NULL || cdo->open == NULL ||
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cdo->release == NULL)
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return -2;
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ENSURE(tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY);
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ENSURE(lock_door, CDC_LOCK);
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ENSURE(select_speed, CDC_SELECT_SPEED);
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ENSURE(select_disc, CDC_SELECT_DISC);
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ENSURE(get_last_session, CDC_MULTI_SESSION);
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ENSURE(audio_ioctl, CDC_PLAY_AUDIO);
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ENSURE(media_changed, CDC_MEDIA_CHANGED);
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cdromdevs[major] = cdo;
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cdo->options = CDO_AUTO_CLOSE | CDO_USE_FFLAGS | CDO_LOCK;
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cdo->mc_flags = 0;
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return 0;
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}
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#undef ENSURE
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int unregister_cdrom(int major, char *name)
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{
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if (major < 0 || major >= MAX_BLKDEV)
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return -1;
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if (cdromdevs[major] == NULL)
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return -2;
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cdromdevs[major] = NULL;
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return 0;
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}
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/* We need our own cdrom error types! This is a temporary solution. */
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#ifndef ENOMEDIUM
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#define ENOMEDIUM EAGAIN /* no medium in removable device */
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#endif
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/* We use the open-option O_NONBLOCK to indicate that the
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* purpose of opening is only for subsequent ioctl() calls; no device
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* integrity checks are performed.
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*
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* We hope that all cd-player programs will adopt this convention. It
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* is in their own interest: device control becomes a lot easier
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* this way.
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*/
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int open_for_data(struct cdrom_device_ops *, kdev_t);
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int cdrom_open(struct inode *ip, struct file *fp)
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{
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kdev_t dev = ip->i_rdev;
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struct cdrom_device_ops *cdo = cdromdevs[MAJOR(dev)];
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int purpose = !!(fp->f_flags & O_NONBLOCK);
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if (cdo == NULL || MINOR(dev) >= cdo->minors)
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return -ENODEV;
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if (fp->f_mode & FM_WRITE)
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return -EROFS;
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purpose = purpose || !(cdo->options & CDO_USE_FFLAGS);
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if (cdo->open_files(dev) || purpose)
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return cdo->open(dev, purpose);
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else
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return open_for_data(cdo, dev);
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}
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int open_for_data(struct cdrom_device_ops * cdo, kdev_t dev)
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{
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int ret;
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if (cdo->drive_status != NULL) {
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int ds = cdo->drive_status(dev);
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if (ds == CDS_TRAY_OPEN) {
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/* can/may i close it? */
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if (cdo->capability & ~cdo->mask & CDC_CLOSE_TRAY &&
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cdo->options & CDO_AUTO_CLOSE) {
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if (cdo->tray_move(dev, 0))
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return -EIO;
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} else
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return -ENOMEDIUM; /* can't close: too bad */
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ds = cdo->drive_status(dev);
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if (ds == CDS_NO_DISC)
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return -ENOMEDIUM;
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}
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}
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if (cdo->disc_status != NULL) {
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int ds = cdo->disc_status(dev);
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if (ds == CDS_NO_DISC)
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return -ENOMEDIUM;
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if (cdo->options & CDO_CHECK_TYPE &&
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ds != CDS_DATA_1)
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return -ENODATA;
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}
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/* all is well, we can open the device */
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ret = cdo->open(dev, 0); /* open for data */
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if (cdo->capability & ~cdo->mask & CDC_LOCK &&
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cdo->options & CDO_LOCK)
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cdo->lock_door(dev, 1);
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return ret;
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}
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/* Admittedly, the logic below could be performed in a nicer way. */
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void cdrom_release(struct inode *ip, struct file *fp)
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{
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kdev_t dev = ip->i_rdev;
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struct cdrom_device_ops *cdo = cdromdevs[MAJOR(dev)];
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if (cdo == NULL || MINOR(dev) >= cdo->minors)
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return;
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if (cdo->open_files(dev) == 1 && /* last process that closes dev */
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cdo->options & CDO_LOCK &&
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cdo->capability & ~cdo->mask & CDC_LOCK)
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cdo->lock_door(dev, 0);
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cdo->release(dev);
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if (cdo->open_files(dev) == 0) { /* last process that closes dev */
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sync_dev(dev);
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invalidate_buffers(dev);
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if (cdo->options & CDO_AUTO_EJECT &&
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cdo->capability & ~cdo->mask & CDC_OPEN_TRAY)
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cdo->tray_move(dev, 1);
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}
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}
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/* We want to make media_changed accessible to the user through an
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* ioctl. The main problem now is that we must double-buffer the
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* low-level implementation, to assure that the VFS and the user both
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* see a medium change once.
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*
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* For now, i've implemented only 16 minor devs (half a long), i have to
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* think of a better solution... $Queue$ is either 0 or 1. Queue 0 is
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* in the lower 16 bits, queue 1 in the higher 16 bits.
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*/
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int media_changed(kdev_t dev, int queue)
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{
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unsigned int major = MAJOR(dev);
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unsigned int minor = MINOR(dev);
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struct cdrom_device_ops *cdo = cdromdevs[major];
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int ret;
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unsigned long mask = 1 << (16 * queue + minor);
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queue &= 1;
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if (cdo == NULL || minor >= 16)
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return -1;
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ret = !!(cdo->mc_flags & mask); /* changed since last call? */
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if (cdo->media_changed(dev)) {
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cdo->mc_flags |= 0x10001 << minor; /* set bit on both queues */
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ret |= 1;
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}
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cdo->mc_flags &= ~mask; /* clear bit */
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return ret;
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}
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int cdrom_media_changed(kdev_t dev)
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{
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struct cdrom_device_ops *cdo = cdromdevs[MAJOR(dev)];
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if (cdo == NULL || MINOR(dev) >= cdo->minors)
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return -ENODEV;
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if (cdo->media_changed == NULL)
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return -EINVAL;
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return media_changed(dev, 0);
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}
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/* Requests to the low-level drivers will /always/ be done in the
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following format convention:
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CDROM_LBA: all data-related requests.
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CDROM_MSF: all audio-related requests.
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However, a low-level implementation is allowed to refuse this
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request, and return information in its own favorite format.
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| 236 |
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It doesn't make sense /at all/ to ask for a play_audio in LBA
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format, or ask for multi-session info in MSF format. However, for
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backward compatibility these format requests will be satisfied, but
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the requests to the low-level drivers will be sanitized in the more
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meaningful format indicated above.
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*/
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| 242 |
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| 243 |
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#undef current /* set in sched.h */
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| 245 |
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void sanitize_format(union cdrom_addr *addr,
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| 246 |
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u_char * current, u_char requested)
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| 247 |
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{
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| 248 |
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if (*current == requested)
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return; /* nothing to be done! */
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| 250 |
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if (requested == CDROM_LBA) {
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| 251 |
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addr->lba = (int) addr->msf.frame +
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75 * (addr->msf.second - 2 + 60 * addr->msf.minute);
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| 253 |
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} else { /* CDROM_MSF */
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| 254 |
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int lba = addr->lba;
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addr->msf.frame = lba % 75;
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| 256 |
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lba /= 75;
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| 257 |
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lba += 2;
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| 258 |
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addr->msf.second = lba % 60;
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| 259 |
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addr->msf.minute = lba / 60;
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| 260 |
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}
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| 261 |
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*current = requested;
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| 262 |
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}
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| 263 |
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| 264 |
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/* All checking and format change makes this code really hard to read!
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| 265 |
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* So let's make some check and memory move macros. These macros are
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| 266 |
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* a little inefficient when both used in the same piece of code, as
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| 267 |
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* verify_area is used twice, but who cares, as ioctl() calls
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| 268 |
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* shouldn't be in inner loops.
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| 269 |
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*/
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| 270 |
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#define GETARG(type, x) { \
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| 271 |
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int ret=verify_area(VERIFY_READ, (void *) arg, sizeof x); \
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| 272 |
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if (ret) return ret; \
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| 273 |
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memcpy_fromfs(&x, (type *) arg, sizeof x); }
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| 274 |
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#define PUTARG(type, x) { \
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| 275 |
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int ret=verify_area(VERIFY_WRITE, (void *) arg, sizeof x); \
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| 276 |
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if (ret) return ret; \
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| 277 |
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memcpy_tofs((type *) arg, &x, sizeof x); }
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| 278 |
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|
| 279 |
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/* Some of the cdrom ioctls are not implemented here, because these
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| 280 |
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* appear to be either too device-specific, or it is not clear to me
|
| 281 |
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* what use they are. These are (number of drivers that support them
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| 282 |
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* in parenthesis): CDROMREADMODE1 (2+ide), CDROMREADMODE2 (2+ide),
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| 283 |
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* CDROMREADAUDIO (2+ide), CDROMREADRAW (2), CDROMREADCOOKED (2),
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| 284 |
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* CDROMSEEK (2), CDROMPLAYBLK (scsi), CDROMREADALL (1). Read-audio,
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| 285 |
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* OK (although i guess the record companies aren't too happy with
|
| 286 |
|
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* this, most drives therefore refuse to transport audio data). But
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| 287 |
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* why are there 5 different READs defined? For now, these functions
|
| 288 |
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* are left over to the device-specific ioctl routine,
|
| 289 |
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* cdo->dev_ioctl. Note that as a result of this, no
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| 290 |
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* memory-verification is performed for these ioctls.
|
| 291 |
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*/
|
| 292 |
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int cdrom_ioctl(struct inode *ip, struct file *fp,
|
| 293 |
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unsigned int cmd, unsigned long arg)
|
| 294 |
|
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{
|
| 295 |
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kdev_t dev = ip->i_rdev;
|
| 296 |
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struct cdrom_device_ops *cdo = cdromdevs[MAJOR(dev)];
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| 297 |
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| 298 |
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if (cdo == NULL || MINOR(dev) >= cdo->minors)
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| 299 |
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return -ENODEV;
|
| 300 |
|
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/* the first few commands do not deal with audio capabilities, but
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| 301 |
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only with routines in cdrom device operations. */
|
| 302 |
|
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switch (cmd) {
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| 303 |
|
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/* maybe we should order cases after statistics of use? */
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| 304 |
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| 305 |
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case CDROMMULTISESSION:
|
| 306 |
|
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{
|
| 307 |
|
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struct cdrom_multisession ms_info;
|
| 308 |
|
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u_char requested_format;
|
| 309 |
|
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if (!(cdo->capability & CDC_MULTI_SESSION))
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| 310 |
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return -EINVAL;
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| 311 |
|
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GETARG(struct cdrom_multisession, ms_info);
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| 312 |
|
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requested_format = ms_info.addr_format;
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| 313 |
|
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ms_info.addr_format = CDROM_LBA;
|
| 314 |
|
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cdo->get_last_session(dev, &ms_info);
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| 315 |
|
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sanitize_format(&ms_info.addr, &ms_info.addr_format,
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| 316 |
|
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requested_format);
|
| 317 |
|
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PUTARG(struct cdrom_multisession, ms_info);
|
| 318 |
|
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return 0;
|
| 319 |
|
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}
|
| 320 |
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| 321 |
|
|
case CDROMEJECT:
|
| 322 |
|
|
if (cdo->open_files(dev) == 1 &&
|
| 323 |
|
|
cdo->capability & ~cdo->mask & CDC_OPEN_TRAY)
|
| 324 |
|
|
return cdo->tray_move(dev, 1);
|
| 325 |
|
|
else
|
| 326 |
|
|
return -EINVAL;
|
| 327 |
|
|
|
| 328 |
|
|
case CDROMCLOSETRAY:
|
| 329 |
|
|
if (cdo->open_files(dev) == 1 &&
|
| 330 |
|
|
cdo->capability & ~cdo->mask & CDC_CLOSE_TRAY)
|
| 331 |
|
|
return cdo->tray_move(dev, 0);
|
| 332 |
|
|
else
|
| 333 |
|
|
return -EINVAL;
|
| 334 |
|
|
|
| 335 |
|
|
case CDROMEJECT_SW:
|
| 336 |
|
|
cdo->options &= ~(CDO_AUTO_CLOSE | CDO_AUTO_EJECT);
|
| 337 |
|
|
if (arg)
|
| 338 |
|
|
cdo->options |= CDO_AUTO_CLOSE | CDO_AUTO_EJECT;
|
| 339 |
|
|
return 0;
|
| 340 |
|
|
|
| 341 |
|
|
case CDROM_MEDIA_CHANGED:
|
| 342 |
|
|
if (cdo->capability & ~cdo->mask & CDC_MEDIA_CHANGED)
|
| 343 |
|
|
return media_changed(dev, 1);
|
| 344 |
|
|
else
|
| 345 |
|
|
return -EINVAL;
|
| 346 |
|
|
|
| 347 |
|
|
case CDROM_SET_OPTIONS:
|
| 348 |
|
|
cdo->options |= (int) arg;
|
| 349 |
|
|
return cdo->options;
|
| 350 |
|
|
|
| 351 |
|
|
case CDROM_CLEAR_OPTIONS:
|
| 352 |
|
|
cdo->options &= ~(int) arg;
|
| 353 |
|
|
return cdo->options;
|
| 354 |
|
|
|
| 355 |
|
|
case CDROM_SELECT_SPEED:
|
| 356 |
|
|
if (0 <= arg && arg <= cdo->speed &&
|
| 357 |
|
|
cdo->capability & ~cdo->mask & CDC_SELECT_SPEED)
|
| 358 |
|
|
return cdo->select_speed(dev, arg);
|
| 359 |
|
|
else
|
| 360 |
|
|
return -EINVAL;
|
| 361 |
|
|
|
| 362 |
|
|
case CDROM_SELECT_DISC:
|
| 363 |
|
|
if (0 <= arg && arg <= cdo->capacity &&
|
| 364 |
|
|
cdo->capability & ~cdo->mask & CDC_SELECT_DISC)
|
| 365 |
|
|
return cdo->select_disc(dev, arg);
|
| 366 |
|
|
else
|
| 367 |
|
|
return -EINVAL;
|
| 368 |
|
|
|
| 369 |
|
|
/* The following function is implemented, although very few audio
|
| 370 |
|
|
* discs give Universal Product Code information, which should just be
|
| 371 |
|
|
* the Medium Catalog Number on the box. Note, that the way the code
|
| 372 |
|
|
* is written on the CD is /not/ uniform across all discs!
|
| 373 |
|
|
*/
|
| 374 |
|
|
case CDROM_GET_MCN: {
|
| 375 |
|
|
struct cdrom_mcn mcn;
|
| 376 |
|
|
if (!(cdo->capability & CDC_MCN))
|
| 377 |
|
|
return -EINVAL;
|
| 378 |
|
|
if (!cdo->get_mcn(dev, &mcn)) {
|
| 379 |
|
|
PUTARG(struct cdrom_mcn, mcn);
|
| 380 |
|
|
return 0;
|
| 381 |
|
|
}
|
| 382 |
|
|
return -EINVAL;
|
| 383 |
|
|
}
|
| 384 |
|
|
|
| 385 |
|
|
case CDROM_DRIVE_STATUS:
|
| 386 |
|
|
if (cdo->drive_status == NULL)
|
| 387 |
|
|
return -EINVAL;
|
| 388 |
|
|
else
|
| 389 |
|
|
return cdo->drive_status(dev);
|
| 390 |
|
|
|
| 391 |
|
|
case CDROM_DISC_STATUS:
|
| 392 |
|
|
if (cdo->disc_status == NULL)
|
| 393 |
|
|
return -EINVAL;
|
| 394 |
|
|
else
|
| 395 |
|
|
return cdo->disc_status(dev);
|
| 396 |
|
|
|
| 397 |
|
|
/* The following is not implemented, because there are too many
|
| 398 |
|
|
* different data type. We could support /1/ raw mode, that is large
|
| 399 |
|
|
* enough to hold everything.
|
| 400 |
|
|
*/
|
| 401 |
|
|
|
| 402 |
|
|
#if 0
|
| 403 |
|
|
case CDROMREADMODE1: {
|
| 404 |
|
|
struct cdrom_msf msf;
|
| 405 |
|
|
char buf[CD_FRAMESIZE];
|
| 406 |
|
|
GETARG(struct cdrom_msf, msf);
|
| 407 |
|
|
if (!cdo->read_audio(dev, cmd, &msf, &buf)) {
|
| 408 |
|
|
PUTARG(char *, buf);
|
| 409 |
|
|
return 0;
|
| 410 |
|
|
}
|
| 411 |
|
|
return -EINVAL;
|
| 412 |
|
|
}
|
| 413 |
|
|
#endif
|
| 414 |
|
|
} /* switch */
|
| 415 |
|
|
|
| 416 |
|
|
/* Now all the audio-ioctls follow, they are all routed through the
|
| 417 |
|
|
same call audio_ioctl(). */
|
| 418 |
|
|
|
| 419 |
|
|
if (cdo->capability & CDC_PLAY_AUDIO)
|
| 420 |
|
|
switch (cmd) {
|
| 421 |
|
|
case CDROMSUBCHNL:
|
| 422 |
|
|
{
|
| 423 |
|
|
struct cdrom_subchnl q;
|
| 424 |
|
|
u_char requested, back;
|
| 425 |
|
|
GETARG(struct cdrom_subchnl, q);
|
| 426 |
|
|
requested = q.cdsc_format;
|
| 427 |
|
|
q.cdsc_format = CDROM_MSF;
|
| 428 |
|
|
if (!cdo->audio_ioctl(dev, cmd, &q)) {
|
| 429 |
|
|
back = q.cdsc_format; /* local copy */
|
| 430 |
|
|
sanitize_format(&q.cdsc_absaddr, &back, requested);
|
| 431 |
|
|
sanitize_format(&q.cdsc_reladdr, &q.cdsc_format, requested);
|
| 432 |
|
|
PUTARG(struct cdrom_subchnl, q);
|
| 433 |
|
|
return 0;
|
| 434 |
|
|
} else
|
| 435 |
|
|
return -EINVAL;
|
| 436 |
|
|
}
|
| 437 |
|
|
case CDROMREADTOCHDR: {
|
| 438 |
|
|
struct cdrom_tochdr header;
|
| 439 |
|
|
GETARG(struct cdrom_tochdr, header);
|
| 440 |
|
|
if (!cdo->audio_ioctl(dev, cmd, &header)) {
|
| 441 |
|
|
PUTARG(struct cdrom_tochdr, header);
|
| 442 |
|
|
return 0;
|
| 443 |
|
|
} else
|
| 444 |
|
|
return -EINVAL;
|
| 445 |
|
|
}
|
| 446 |
|
|
case CDROMREADTOCENTRY: {
|
| 447 |
|
|
struct cdrom_tocentry entry;
|
| 448 |
|
|
u_char requested_format;
|
| 449 |
|
|
GETARG(struct cdrom_tocentry, entry);
|
| 450 |
|
|
requested_format = entry.cdte_format;
|
| 451 |
|
|
/* make interface to low-level uniform */
|
| 452 |
|
|
entry.cdte_format = CDROM_MSF;
|
| 453 |
|
|
if (!(cdo->audio_ioctl(dev, cmd, &entry))) {
|
| 454 |
|
|
sanitize_format(&entry.cdte_addr, &entry.cdte_format, requested_format);
|
| 455 |
|
|
PUTARG(struct cdrom_tocentry, entry);
|
| 456 |
|
|
return 0;
|
| 457 |
|
|
} else
|
| 458 |
|
|
return -EINVAL;
|
| 459 |
|
|
}
|
| 460 |
|
|
case CDROMPLAYMSF: {
|
| 461 |
|
|
struct cdrom_msf msf;
|
| 462 |
|
|
GETARG(struct cdrom_msf, msf);
|
| 463 |
|
|
return cdo->audio_ioctl(dev, cmd, &msf);
|
| 464 |
|
|
}
|
| 465 |
|
|
case CDROMPLAYTRKIND: {
|
| 466 |
|
|
struct cdrom_ti track_index;
|
| 467 |
|
|
GETARG(struct cdrom_ti, track_index);
|
| 468 |
|
|
return cdo->audio_ioctl(dev, cmd, &track_index);
|
| 469 |
|
|
}
|
| 470 |
|
|
case CDROMVOLCTRL: {
|
| 471 |
|
|
struct cdrom_volctrl volume;
|
| 472 |
|
|
GETARG(struct cdrom_volctrl, volume);
|
| 473 |
|
|
return cdo->audio_ioctl(dev, cmd, &volume);
|
| 474 |
|
|
}
|
| 475 |
|
|
case CDROMVOLREAD: {
|
| 476 |
|
|
struct cdrom_volctrl volume;
|
| 477 |
|
|
if (!cdo->audio_ioctl(dev, cmd, &volume)) {
|
| 478 |
|
|
PUTARG(struct cdrom_volctrl, volume);
|
| 479 |
|
|
return 0;
|
| 480 |
|
|
}
|
| 481 |
|
|
return -EINVAL;
|
| 482 |
|
|
}
|
| 483 |
|
|
case CDROMSTART:
|
| 484 |
|
|
case CDROMSTOP:
|
| 485 |
|
|
case CDROMPAUSE:
|
| 486 |
|
|
case CDROMRESUME:
|
| 487 |
|
|
return cdo->audio_ioctl(dev, cmd, NULL);
|
| 488 |
|
|
} /* switch */
|
| 489 |
|
|
|
| 490 |
|
|
if (cdo->dev_ioctl != NULL) /* device specific ioctls? */
|
| 491 |
|
|
return cdo->dev_ioctl(dev, cmd, arg);
|
| 492 |
|
|
return -EINVAL;
|
| 493 |
|
|
}
|
| 494 |
|
|
|
| 495 |
|
|
#ifdef MODULE
|
| 496 |
|
|
int init_module(void)
|
| 497 |
|
|
{
|
| 498 |
|
|
printk(KERN_INFO "Module inserted " VERSION "\n");
|
| 499 |
|
|
return 0;
|
| 500 |
|
|
}
|
| 501 |
|
|
|
| 502 |
|
|
void cleanup_module(void)
|
| 503 |
|
|
{
|
| 504 |
|
|
printk(KERN_INFO "Module cdrom removed\n");
|
| 505 |
|
|
}
|
| 506 |
|
|
|
| 507 |
|
|
#endif
|
| 508 |
|
|
/*
|
| 509 |
|
|
* Local variables:
|
| 510 |
|
|
* comment-column: 40
|
| 511 |
|
|
* compile-command: "gcc -DMODULE -D__KERNEL__ -I/usr/src/linux-obj/include -Wall -Wstrict-prototypes -O2 -m486 -c cdrom.c -o cdrom.o"
|
| 512 |
|
|
* End:
|
| 513 |
|
|
*/
|
