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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_freebsd.c
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1997-02-26
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/*
* plat_freebsd.c
*
* FreeBSD-specific drive control routines.
*
* Todd Pfaff, 3/20/94
*
*/
static char *ident = "@(#)plat_freebsd.c 1.1 3/31/94";
#ifdef __FreeBSD__
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/mount.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/cdio.h>
#include <sys/scsiio.h>
#include <scsi/scsi_all.h>
#include <scsi/scsi_cd.h>
#include "struct.h"
#define DEFAULT_CD_DEVICE "/dev/rcd0d"
void *malloc();
int min_volume = 0;
int max_volume = 128;
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 ioc_toc_header hdr;
if (ioctl(d->fd, CDIOREADTOCHEADER, &hdr) == -1)
return (-1);
*tracks = hdr.ending_track - hdr.starting_track + 1;
return (0);
}
/*
* Get the start time and mode (data or audio) of a track.
*
* XXX - this should get cached, but that means keeping track of ejects.
*/
int
gen_get_trackinfo(d, track, data, startframe)
struct wm_drive *d;
int track, *data, *startframe;
{
struct ioc_read_toc_entry toc;
struct cd_toc_entry toc_buffer;
bzero((char *)&toc_buffer, sizeof(toc_buffer));
toc.address_format = CD_MSF_FORMAT;
toc.starting_track = track;
toc.data_len = sizeof(toc_buffer);
toc.data = &toc_buffer;
if (ioctl(d->fd, CDIOREADTOCENTRYS, &toc))
return (-1);
*data = (toc_buffer.control != 0);
*startframe = toc_buffer.addr.msf.minute*60*75 +
toc_buffer.addr.msf.second * 75 +
toc_buffer.addr.msf.frame;
return (0);
}
/*
* Get the number of frames on the CD.
*/
int
gen_get_cdlen(d, frames)
struct wm_drive *d;
int *frames;
{
int tmp;
struct ioc_toc_header hdr;
int status;
/*
*** FIX THIS ***
I can't figure out how to find the length of the last track.
The CDIOREADTOCENTRYS ioctl() in gen_get_trackinfo() returns an
error if I try to read past the last track returned by the
CDIOREADTOCHEADER ioctl(). There doesn't seem to be any other
way in cdio.h to get the length of a track.
This hack simply adds 10 minutes to the start of the last track
and returns the result as the total cd length.
Todd Pfaff
03/20/94
*/
if (ioctl(d->fd, CDIOREADTOCHEADER, &hdr))
return (-1);
if(gen_get_trackinfo(d, hdr.ending_track, &tmp, frames) == -1)
return (-1);
*frames += 10*60*75;
return(0);
}
/*
* 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 ioc_read_subchannel sc;
struct cd_sub_channel_info scd;
/* If we can't get status, the CD is ejected, so default to that. */
*mode = EJECTED;
sc.address_format = CD_MSF_FORMAT;
sc.data_format = CD_CURRENT_POSITION;
sc.track = 0;
sc.data_len = sizeof(scd);
sc.data = (struct cd_sub_channel_info *)&scd;
/* Is the device open? */
if (d->fd < 0)
{
switch (wmcd_open(d)) {
case -1: /* error */
return (-1);
case 1: /* retry */
return (0);
}
}
if (ioctl(d->fd, CDIOCREADSUBCHANNEL, &sc))
return (0); /* ejected */
switch (scd.header.audio_status) {
case CD_AS_PLAY_IN_PROGRESS:
*mode = PLAYING;
dopos:
*pos = scd.what.position.absaddr.msf.minute * 60 * 75 +
scd.what.position.absaddr.msf.second * 75 +
scd.what.position.absaddr.msf.frame;
*track = scd.what.position.track_number;
*index = scd.what.position.index_number;
break;
case CD_AS_PLAY_PAUSED:
if (oldmode == PLAYING || oldmode == PAUSED)
{
*mode = PAUSED;
goto dopos;
}
else
*mode = STOPPED;
break;
case CD_AS_PLAY_COMPLETED:
*mode = TRACK_DONE; /* waiting for next track. */
break;
case CD_AS_NO_STATUS:
case 0:
*mode = STOPPED;
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 ioc_vol vol;
left = scale_volume(left, 100);
right = scale_volume(right, 100);
bzero((char *)&vol, sizeof(vol));
vol.vol[LEFT_PORT] = left;
vol.vol[RIGHT_PORT] = right;
if (ioctl(d->fd, CDIOCSETVOL, &vol))
return (-1);
return (0);
}
/*
* Pause the CD.
*/
int
gen_pause(d)
struct wm_drive *d;
{
return (ioctl(d->fd, CDIOCPAUSE));
}
/*
* Resume playing the CD (assuming it was paused.)
*/
int
gen_resume(d)
struct wm_drive *d;
{
return (ioctl(d->fd, CDIOCRESUME));
}
/*
* Stop the CD.
*/
int
gen_stop(d)
struct wm_drive *d;
{
return (ioctl(d->fd, CDIOCSTOP));
}
/*
* 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 ioc_play_msf msf;
msf.start_m = start / (60*75);
msf.start_s = (start % (60*75)) / 75;
msf.start_f = start % 75;
msf.end_m = end / (60*75);
msf.end_s = (end % (60*75)) / 75;
msf.end_f = end % 75;
if (ioctl(d->fd, CDIOCSTART))
return (-1);
if (ioctl(d->fd, CDIOCPLAYMSF, &msf))
return (-2);
return (0);
}
/*
* Eject the current CD, if there is one.
*/
int
gen_eject(d)
struct wm_drive *d;
{
/* On some systems, we can check to see if the CD is mounted. */
struct stat stbuf;
struct statfs buf;
if (fstat(d->fd, &stbuf) != 0)
return (-2);
/* Is this a mounted filesystem? */
if (fstatfs(stbuf.st_rdev, &buf) == 0)
return (-3);
return (ioctl(d->fd, CDIOCEJECT));
}
/*
* unscale_volume(cd_vol, max)
*
* Given a value between min_volume and max_volume, return the volume slider
* value needed to achieve that value.
*
* Rather than perform floating-point calculations to reverse the above
* formula, we simply do a binary search of scale_volume()'s return values.
*/
static int
unscale_volume(cd_vol, max)
int cd_vol, max;
{
int vol = 0, top = max, bot = 0, scaled;
while (bot <= top)
{
vol = (top + bot) / 2;
scaled = scale_volume(vol, max);
if (cd_vol == scaled)
break;
if (cd_vol < scaled)
top = vol - 1;
else
bot = vol + 1;
}
if (vol < 0)
vol = 0;
else if (vol > max)
vol = max;
return (vol);
}
/*
* 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;
{
struct ioc_vol vol;
if (d->fd >= 0)
{
bzero((char *)&vol, sizeof(vol));
if (ioctl(d->fd, CDIOCGETVOL, &vol))
*left = *right = -1;
else
{
*left = unscale_volume(vol.vol[LEFT_PORT], 100);
*right = unscale_volume(vol.vol[RIGHT_PORT], 100);
}
}
else
*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;
{
return (-1);
}
/*
* 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;
char vendor[9], model[17], rev[5];
if (d->fd >= 0) /* Device already open? */
return (0);
if (cd_device == NULL)
cd_device = DEFAULT_CD_DEVICE;
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++;
}
}
/* 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;
vendor[0] = model[0] = rev[0] = '\0';
*d = *(find_drive_struct(vendor, model, rev));
(d->init)(d);
d->fd = fd;
return (0);
}
void
keep_cd_open() { }
#endif