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Sun Solutions CD - APR '97 - SEP '97 (704-3778-12 Rev. H)(Sun Microsystems, Inc.)(1997).iso
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plat_linux.c
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1997-02-26
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/*
* @(#)plat_linux.c 1.8 5/14/94
*
* Linux-specific drive control routines. Very similar to the Sun module.
*/
static char *ident = "@(#)plat_linux.c 1.8 5/14/94";
#ifdef linux
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <linux/cdrom.h>
#include "struct.h"
#define DEFAULT_CD_DEVICE "/dev/sr0"
#define max(a,b) ((a) > (b) ? (a) : (b))
#ifdef LINUX_SCSI_PASSTHROUGH
# define SCSI_IOCTL_SEND_COMMAND 1
#endif
void *malloc();
char *strchr();
int min_volume = 128;
int max_volume = 255;
extern char *cd_device;
/*
* Initialize the drive. A no-op for the generic driver.
*/
int
gen_init(d)
struct wm_drive *d;
{
return (0);
}
/*
* Get the number of tracks on the CD.
*/
int
gen_get_trackcount(d, tracks)
struct wm_drive *d;
int *tracks;
{
struct cdrom_tochdr hdr;
if (ioctl(d->fd, CDROMREADTOCHDR, &hdr))
return (-1);
*tracks = hdr.cdth_trk1;
return (0);
}
/*
* Get the start time and mode (data or audio) of a track.
*/
int
gen_get_trackinfo(d, track, data, startframe)
struct wm_drive *d;
int track, *data, *startframe;
{
struct cdrom_tocentry entry;
entry.cdte_track = track;
entry.cdte_format = CDROM_MSF;
if (ioctl(d->fd, CDROMREADTOCENTRY, &entry))
return (-1);
*startframe = entry.cdte_addr.msf.minute * 60 * 75 +
entry.cdte_addr.msf.second * 75 +
entry.cdte_addr.msf.frame;
*data = entry.cdte_ctrl & CDROM_DATA_TRACK ? 1 : 0;
return (0);
}
/*
* Get the number of frames on the CD.
*/
int
gen_get_cdlen(d, frames)
struct wm_drive *d;
int *frames;
{
int tmp;
return (gen_get_trackinfo(d, CDROM_LEADOUT, &tmp, frames));
}
/* Alarm signal handler. */
static void do_nothing(x) int x; { x++; }
/*
* Get the current status of the drive: the current play mode, the absolute
* position from start of disc (in frames), and the current track and index
* numbers if the CD is playing or paused.
*/
int
gen_get_drive_status(d, oldmode, mode, pos, track, index)
struct wm_drive *d;
enum cd_modes oldmode, *mode;
int *pos, *track, *index;
{
struct cdrom_subchnl sc;
struct itimerval old_timer, new_timer;
/* If we can't get status, the CD is ejected, so default to that. */
*mode = EJECTED;
/* Is the device open? */
if (d->fd < 0)
{
switch (wmcd_open(d)) {
case -1: /* error */
return (-1);
case 1: /* retry */
return (0);
}
}
sc.cdsc_format = CDROM_MSF;
if (ioctl(d->fd, CDROMSUBCHNL, &sc))
return (0);
switch (sc.cdsc_audiostatus) {
case CDROM_AUDIO_PLAY:
*mode = PLAYING;
*track = sc.cdsc_trk;
*index = sc.cdsc_ind;
*pos = sc.cdsc_absaddr.msf.minute * 60 * 75 +
sc.cdsc_absaddr.msf.second * 75 +
sc.cdsc_absaddr.msf.frame;
break;
case CDROM_AUDIO_PAUSED:
case CDROM_AUDIO_NO_STATUS:
case CDROM_AUDIO_INVALID: /**/
if (oldmode == PLAYING || oldmode == PAUSED)
{
*mode = PAUSED;
*track = sc.cdsc_trk;
*index = sc.cdsc_ind;
*pos = sc.cdsc_absaddr.msf.minute * 60 * 75 +
sc.cdsc_absaddr.msf.second * 75 +
sc.cdsc_absaddr.msf.frame;
}
else
*mode = STOPPED;
break;
case CDROM_AUDIO_COMPLETED:
*mode = TRACK_DONE; /* waiting for next track. */
break;
default:
*mode = UNKNOWN;
break;
}
return (0);
}
/*
* scale_volume(vol, max)
*
* Return a volume value suitable for passing to the CD-ROM drive. "vol"
* is a volume slider setting; "max" is the slider's maximum value.
*
* On Sun and DEC CD-ROM drives, the amount of sound coming out the jack
* increases much faster toward the top end of the volume scale than it
* does at the bottom. To make up for this, we make the volume scale look
* sort of logarithmic (actually an upside-down inverse square curve) so
* that the volume value passed to the drive changes less and less as you
* approach the maximum slider setting. The actual formula looks like
*
* (max^2 - (max - vol)^2) * (max_volume - min_volume)
* v = --------------------------------------------------- + min_volume
* max^2
*
* If your system's volume settings aren't broken in this way, something
* like the following should work:
*
* return ((vol * (max_volume - min_volume)) / max + min_volume);
*/
static int
scale_volume(vol, max)
int vol, max;
{
return ((max * max - (max - vol) * (max - vol)) *
(max_volume - min_volume) / (max * max) + min_volume);
}
/*
* Set the volume level for the left and right channels. Their values
* range from 0 to 100.
*/
int
gen_set_volume(d, left, right)
struct wm_drive *d;
int left, right;
{
struct cdrom_volctrl v;
/* Adjust the volume to make up for the CD-ROM drive's weirdness. */
left = scale_volume(left, 100);
right = scale_volume(right, 100);
v.channel0 = v.channel2 = left < 0 ? 0 : left > 255 ? 255 : left;
v.channel1 = v.channel3 = right < 0 ? 0 : right > 255 ? 255 : right;
return (ioctl(d->fd, CDROMVOLCTRL, &v));
}
/*
* Pause the CD.
*/
int
gen_pause(d)
struct wm_drive *d;
{
return (ioctl(d->fd, CDROMPAUSE));
}
/*
* Resume playing the CD (assuming it was paused.)
*/
int
gen_resume(d)
struct wm_drive *d;
{
return (ioctl(d->fd, CDROMRESUME));
}
/*
* Stop the CD.
*/
int
gen_stop(d)
struct wm_drive *d;
{
return (ioctl(d->fd, CDROMSTOP));
}
/*
* Play the CD from one position to another (both in frames.)
*/
int
gen_play(d, start, end)
struct wm_drive *d;
int start, end;
{
struct cdrom_msf msf;
msf.cdmsf_min0 = start / (60*75);
msf.cdmsf_sec0 = (start % (60*75)) / 75;
msf.cdmsf_frame0 = start % 75;
msf.cdmsf_min1 = end / (60*75);
msf.cdmsf_sec1 = (end % (60*75)) / 75;
msf.cdmsf_frame1 = end % 75;
if (ioctl(d->fd, CDROMSTART))
return (-1);
if (ioctl(d->fd, CDROMPLAYMSF, &msf))
return (-2);
return (0);
}
/*
* Eject the current CD, if there is one.
*/
int
gen_eject(d)
struct wm_drive *d;
{
struct stat stbuf;
struct ustat ust;
if (fstat(d->fd, &stbuf) != 0)
return (-2);
/* Is this a mounted filesystem? */
if (ustat(stbuf.st_rdev, &ust) == 0)
return (-3);
if (ioctl(d->fd, CDROMEJECT))
return (-1);
return (0);
}
/*
* Keep the CD open all the time.
*/
void
keep_cd_open()
{
int fd;
struct flock fl;
extern end;
for (fd = 0; fd < 256; fd++)
close(fd);
if (fork())
exit(0);
if ((fd = open("/tmp/cd.lock", O_RDWR | O_CREAT, 0666)) < 0)
exit(0);
fl.l_type = F_WRLCK;
fl.l_whence = 0;
fl.l_start = 0;
fl.l_len = 0;
if (fcntl(fd, F_SETLK, &fl) < 0)
exit(0);
if (open(cd_device, 0) >= 0)
{
brk(&end);
pause();
}
exit(0);
}
/*
* Read the initial volume from the drive, if available. Each channel
* ranges from 0 to 100, with -1 indicating data not available.
*/
int
gen_get_volume(d, left, right)
struct wm_drive *d;
int *left, *right;
{
/* Suns, HPs, Linux, NEWS can't read the volume; oh well */
*left = *right = -1;
return (0);
}
/*
* Send an arbitrary SCSI command to a device.
*/
int
wm_scsi(d, cdb, cdblen, retbuf, retbuflen, getreply)
struct wm_drive *d;
unsigned char *cdb;
int cdblen;
void *retbuf;
int retbuflen;
int getreply;
{
#ifdef LINUX_SCSI_PASSTHROUGH
char *cmd;
int cmdsize;
cmdsize = 2 * sizeof(int);
if (retbuf)
{
if (getreply) cmdsize += max(cdblen, retbuflen);
else cmdsize += (cdblen + retbuflen);
}
else cmdsize += cdblen;
cmd = malloc(cmdsize);
if (cmd == NULL)
return (-1);
((int*)cmd)[0] = cdblen + ((retbuf && !getreply) ? retbuflen : 0);
((int*)cmd)[1] = ((retbuf && getreply) ? retbuflen : 0);
memcpy(cmd + 2*sizeof(int), cdb, cdblen);
if (retbuf && !getreply)
memcpy(cmd + 2*sizeof(int) + cdblen, retbuf, retbuflen);
if (ioctl(d->fd, SCSI_IOCTL_SEND_COMMAND, cmd))
{
free(cmd);
return (-1);
}
if (retbuf && getreply)
memcpy(retbuf, cmd + 2*sizeof(int), retbuflen);
free(cmd);
return 0;
#else
return (-1);
#endif
}
/*
* Open the CD device and figure out what kind of drive is attached.
*/
int
wmcd_open(d)
struct wm_drive *d;
{
int fd;
static int warned = 0;
#ifdef LINUX_SCSI_PASSTHROUGH
char vendor[9], model[17], rev[5];
#endif
if (cd_device == NULL)
cd_device = DEFAULT_CD_DEVICE;
if (d->fd >= 0) /* Device already open? */
return (0);
d->fd = open(cd_device, 0);
if (d->fd < 0)
{
if (errno == EACCES)
{
if (!warned)
{
fprintf(stderr,
"As root, please run\n\nchmod 666 %s\n\n%s\n", cd_device,
"to give yourself permission to access the CD-ROM device.");
warned++;
}
}
else if (errno != ENXIO)
{
perror(cd_device);
exit(1);
}
/* No CD in drive. */
return (1);
}
if (warned)
{
warned = 0;
fprintf(stderr, "Thank you.\n");
}
/* Now fill in the relevant parts of the wm_drive structure. */
fd = d->fd;
#ifdef LINUX_SCSI_PASSTHROUGH
/* Can we figure out the drive type? */
vendor[0] = model[0] = rev[0] = '\0';
wm_scsi_get_drive_type(d, vendor, model, rev);
*d = *(find_drive_struct(vendor, model, rev));
about_set_drivetype(d->vendor, d->model, rev);
#else
*d = *(find_drive_struct("", "", ""));
#endif
d->fd = fd;
(d->init)(d);
return (0);
}
#endif /* linux */