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Diffstat (limited to 'sys/dev/sound/midi/midi.c')
| -rw-r--r-- | sys/dev/sound/midi/midi.c | 702 |
1 files changed, 702 insertions, 0 deletions
diff --git a/sys/dev/sound/midi/midi.c b/sys/dev/sound/midi/midi.c new file mode 100644 index 0000000..83152cf --- /dev/null +++ b/sys/dev/sound/midi/midi.c @@ -0,0 +1,702 @@ +/* + * Main midi driver for FreeBSD. This file provides the main + * entry points for probe/attach and all i/o demultiplexing, including + * default routines for generic devices. + * + * (C) 1999 Seigo Tanimura + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials provided + * with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS + * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * + * For each card type a template "mididev_info" structure contains + * all the relevant parameters, both for configuration and runtime. + * + * In this file we build tables of pointers to the descriptors for + * the various supported cards. The generic probe routine scans + * the table(s) looking for a matching entry, then invokes the + * board-specific probe routine. If successful, a pointer to the + * correct mididev_info is stored in mididev_last_probed, for subsequent + * use in the attach routine. The generic attach routine copies + * the template to a permanent descriptor (midi_info[unit] and + * friends), initializes all generic parameters, and calls the + * board-specific attach routine. + * + * On device calls, the generic routines do the checks on unit and + * device parameters, then call the board-specific routines if + * available, or try to perform the task using the default code. + * + * $FreeBSD$ + * + */ + +#include "opt_devfs.h" + +#include <dev/sound/midi/midi.h> + +static devclass_t midi_devclass; + +static d_open_t midiopen; +static d_close_t midiclose; +static d_ioctl_t midiioctl; +static d_read_t midiread; +static d_write_t midiwrite; +static d_poll_t midipoll; + +/* These functions are local. */ +static d_open_t midistat_open; +static d_close_t midistat_close; +static d_read_t midistat_read; +static int midi_initstatus(char *buf, int size); +static int midi_readstatus(char *buf, int *ptr, struct uio *uio); + +#define CDEV_MAJOR MIDI_CDEV_MAJOR +static struct cdevsw midi_cdevsw = { + /* open */ midiopen, + /* close */ midiclose, + /* read */ midiread, + /* write */ midiwrite, + /* ioctl */ midiioctl, + /* poll */ midipoll, + /* mmap */ nommap, + /* strategy */ nostrategy, + /* name */ "midi", + /* maj */ CDEV_MAJOR, + /* dump */ nodump, + /* psize */ nopsize, + /* flags */ 0, + /* bmaj */ -1 +}; + +/* + * descriptors for active devices. also used as the public softc + * of a device. + */ +mididev_info midi_info[NMIDI_MAX]; + +u_long nmidi; /* total number of midi devices, filled in by the driver */ +u_long nsynth; /* total number of synthesizers, filled in by the driver */ + +/* These make the buffer for /dev/midistat */ +static int midistatbusy; +static char midistatbuf[4096]; +static int midistatptr; + +/* + * This is the generic init routine + */ +int +midiinit(mididev_info *d, device_t dev) +{ + int unit; + + if (midi_devclass == NULL) { + midi_devclass = device_get_devclass(dev); + make_dev(&midi_cdevsw, MIDIMKMINOR(0, MIDI_DEV_STATUS), + UID_ROOT, GID_WHEEL, 0444, "midistat"); + } + + unit = device_get_unit(dev); + make_dev(&midi_cdevsw, MIDIMKMINOR(unit, MIDI_DEV_MIDIN), + UID_ROOT, GID_WHEEL, 0666, "midi%d", unit); + + /* + * initialize standard parameters for the device. This can be + * overridden by device-specific configurations but better do + * here the generic things. + */ + + d->unit = device_get_unit(dev); + d->softc = device_get_softc(dev); + d->dev = dev; + d->magic = MAGIC(d->unit); /* debugging... */ + + return 0 ; +} + +/* + * a small utility function which, given a device number, returns + * a pointer to the associated mididev_info struct, and sets the unit + * number. + */ +mididev_info * +get_mididev_info(dev_t i_dev, int *unit) +{ + int u; + mididev_info *d = NULL; + + if (MIDIDEV(i_dev) != MIDI_DEV_MIDIN) + return NULL; + u = MIDIUNIT(i_dev); + if (unit) + *unit = u; + + if (u >= nmidi + nsynth) { + DEB(printf("get_mididev_info: unit %d is not configured.\n", u)); + return NULL; + } + d = &midi_info[u]; + + return d; +} + +/* + * here are the switches for the main functions. The switches do + * all necessary checks on the device number to make sure + * that the device is configured. They also provide some default + * functionalities so that device-specific drivers have to deal + * only with special cases. + */ + +static int +midiopen(dev_t i_dev, int flags, int mode, struct proc * p) +{ + switch (MIDIDEV(i_dev)) { + case MIDI_DEV_MIDIN: + return midi_open(i_dev, flags, mode, p); + case MIDI_DEV_STATUS: + return midistat_open(i_dev, flags, mode, p); + } + + return (ENXIO); +} + +static int +midiclose(dev_t i_dev, int flags, int mode, struct proc * p) +{ + switch (MIDIDEV(i_dev)) { + case MIDI_DEV_MIDIN: + return midi_close(i_dev, flags, mode, p); + case MIDI_DEV_STATUS: + return midistat_close(i_dev, flags, mode, p); + } + + return (ENXIO); +} + +static int +midiread(dev_t i_dev, struct uio * buf, int flag) +{ + switch (MIDIDEV(i_dev)) { + case MIDI_DEV_MIDIN: + return midi_read(i_dev, buf, flag); + case MIDI_DEV_STATUS: + return midistat_read(i_dev, buf, flag); + } + + return (ENXIO); +} + +static int +midiwrite(dev_t i_dev, struct uio * buf, int flag) +{ + switch (MIDIDEV(i_dev)) { + case MIDI_DEV_MIDIN: + return midi_write(i_dev, buf, flag); + } + + return (ENXIO); +} + +static int +midiioctl(dev_t i_dev, u_long cmd, caddr_t arg, int mode, struct proc * p) +{ + switch (MIDIDEV(i_dev)) { + case MIDI_DEV_MIDIN: + return midi_ioctl(i_dev, cmd, arg, mode, p); + } + + return (ENXIO); +} + +static int +midipoll(dev_t i_dev, int events, struct proc * p) +{ + switch (MIDIDEV(i_dev)) { + case MIDI_DEV_MIDIN: + return midi_poll(i_dev, events, p); + } + + return (ENXIO); +} + +/* + * Followings are the generic methods in midi drivers. + */ + +int +midi_open(dev_t i_dev, int flags, int mode, struct proc * p) +{ + int dev, unit, s, ret; + mididev_info *d; + + dev = minor(i_dev); + d = get_mididev_info(i_dev, &unit); + + DEB(printf("open midi%d subdev %d flags 0x%08x mode 0x%08x\n", + unit, dev & 0xf, flags, mode)); + + if (d == NULL) + return (ENXIO); + + s = splmidi(); + + /* Mark this device busy. */ + device_busy(d->dev); + if ((d->flags & MIDI_F_BUSY) != 0) { + splx(s); + DEB(printf("opl_open: unit %d is busy.\n", unit)); + return (EBUSY); + } + d->flags |= MIDI_F_BUSY; + d->flags &= ~(MIDI_F_READING | MIDI_F_WRITING); + d->fflags = flags; + + /* Init the queue. */ + if ((d->fflags & FREAD) != 0) + midibuf_init(&d->midi_dbuf_in); + if ((d->fflags & FWRITE) != 0) { + midibuf_init(&d->midi_dbuf_out); + midibuf_init(&d->midi_dbuf_passthru); + } + + if (d->open == NULL) + ret = 0; + else + ret = d->open(i_dev, flags, mode, p); + + splx(s); + + return (ret); +} + +int +midi_close(dev_t i_dev, int flags, int mode, struct proc * p) +{ + int dev, unit, s, ret; + mididev_info *d; + + dev = minor(i_dev); + d = get_mididev_info(i_dev, &unit); + + DEB(printf("close midi%d subdev %d\n", unit, dev & 0xf)); + + if (d == NULL) + return (ENXIO); + + s = splmidi(); + + /* Clear the queues. */ + if ((d->fflags & FREAD) != 0) + midibuf_init(&d->midi_dbuf_in); + if ((d->fflags & FWRITE) != 0) { + midibuf_init(&d->midi_dbuf_out); + midibuf_init(&d->midi_dbuf_passthru); + } + + /* Stop playing and unmark this device busy. */ + d->flags &= ~MIDI_F_BUSY; + d->fflags = 0; + + device_unbusy(d->dev); + + if (d->close == NULL) + ret = 0; + else + ret = d->close(i_dev, flags, mode, p); + + splx(s); + + return (ret); +} + +int +midi_read(dev_t i_dev, struct uio * buf, int flag) +{ + int dev, unit, s, len, ret; + mididev_info *d ; + + dev = minor(i_dev); + + d = get_mididev_info(i_dev, &unit); + DEB(printf("read midi%d subdev %d flag 0x%08x\n", unit, dev & 0xf, flag)); + + if (d == NULL) + return (ENXIO); + + ret = 0; + s = splmidi(); + + /* Begin recording. */ + d->callback(d, MIDI_CB_START | MIDI_CB_RD); + + /* Have we got the data to read? */ + if ((d->flags & MIDI_F_NBIO) != 0 && d->midi_dbuf_in.rl == 0) + ret = EAGAIN; + else { + len = buf->uio_resid; + ret = midibuf_uioread(&d->midi_dbuf_in, buf, len); + if (ret < 0) + ret = -ret; + else + ret = 0; + } + + if (ret == 0 && d->read != NULL) + ret = d->read(i_dev, buf, flag); + + splx(s); + + return (ret); +} + +int +midi_write(dev_t i_dev, struct uio * buf, int flag) +{ + int dev, unit, s, len, ret; + mididev_info *d; + + dev = minor(i_dev); + d = get_mididev_info(i_dev, &unit); + + DEB(printf("write midi%d subdev %d flag 0x%08x\n", unit, dev & 0xf, flag)); + + if (d == NULL) + return (ENXIO); + + ret = 0; + s = splmidi(); + + /* Begin playing. */ + d->callback(d, MIDI_CB_START | MIDI_CB_WR); + + /* Have we got the data to write? */ + if ((d->flags & MIDI_F_NBIO) != 0 && d->midi_dbuf_out.fl == 0) + ret = EAGAIN; + else { + len = buf->uio_resid; + if (len > d->midi_dbuf_out.fl && + (d->flags & MIDI_F_NBIO)) + len = d->midi_dbuf_out.fl; + ret = midibuf_uiowrite(&d->midi_dbuf_out, buf, len); + if (ret < 0) + ret = -ret; + else + ret = 0; + } + + /* Begin playing. */ + d->callback(d, MIDI_CB_START | MIDI_CB_WR); + + if (ret == 0 && d->write != NULL) + ret = d->write(i_dev, buf, flag); + + splx(s); + + return (ret); +} + +/* + * generic midi ioctl. Functions of the default driver can be + * overridden by the device-specific ioctl call. + * If a device-specific call returns ENOSYS (Function not implemented), + * the default driver is called. Otherwise, the returned value + * is passed up. + * + * The default handler, for many parameters, sets the value in the + * descriptor, sets MIDI_F_INIT, and calls the callback function with + * reason INIT. If successful, the callback returns 1 and the caller + * can update the parameter. + */ + +int +midi_ioctl(dev_t i_dev, u_long cmd, caddr_t arg, int mode, struct proc * p) +{ + int ret = ENOSYS, dev, unit; + mididev_info *d; + struct snd_size *sndsize; + u_long s; + + dev = minor(i_dev); + d = get_mididev_info(i_dev, &unit); + + if (d == NULL) + return (ENXIO); + + if (d->ioctl) + ret = d->ioctl(i_dev, cmd, arg, mode, p); + if (ret != ENOSYS) + return ret; + + /* + * pass control to the default ioctl handler. Set ret to 0 now. + */ + ret = 0; + + /* + * all routines are called with int. blocked. Make sure that + * ints are re-enabled when calling slow or blocking functions! + */ + s = splmidi(); + switch(cmd) { + + /* + * we start with the new ioctl interface. + */ + case AIONWRITE: /* how many bytes can write ? */ + *(int *)arg = d->midi_dbuf_out.fl; + break; + + case AIOSSIZE: /* set the current blocksize */ + sndsize = (struct snd_size *)arg; + if (sndsize->play_size <= d->midi_dbuf_out.unit_size && sndsize->rec_size <= d->midi_dbuf_in.unit_size) { + d->flags &= ~MIDI_F_HAS_SIZE; + d->midi_dbuf_out.blocksize = d->midi_dbuf_out.unit_size; + d->midi_dbuf_in.blocksize = d->midi_dbuf_in.unit_size; + } + else { + if (sndsize->play_size > d->midi_dbuf_out.bufsize / 4) + sndsize->play_size = d->midi_dbuf_out.bufsize / 4; + if (sndsize->rec_size > d->midi_dbuf_in.bufsize / 4) + sndsize->rec_size = d->midi_dbuf_in.bufsize / 4; + /* Round up the size to the multiple of EV_SZ. */ + d->midi_dbuf_out.blocksize = + ((sndsize->play_size + d->midi_dbuf_out.unit_size - 1) + / d->midi_dbuf_out.unit_size) * d->midi_dbuf_out.unit_size; + d->midi_dbuf_in.blocksize = + ((sndsize->rec_size + d->midi_dbuf_in.unit_size - 1) + / d->midi_dbuf_in.unit_size) * d->midi_dbuf_in.unit_size; + d->flags |= MIDI_F_HAS_SIZE; + } + /* FALLTHROUGH */ + case AIOGSIZE: /* get the current blocksize */ + sndsize = (struct snd_size *)arg; + sndsize->play_size = d->midi_dbuf_out.blocksize; + sndsize->rec_size = d->midi_dbuf_in.blocksize; + + ret = 0; + break; + + case AIOSTOP: + if (*(int *)arg == AIOSYNC_PLAY) /* play */ + *(int *)arg = d->callback(d, MIDI_CB_STOP | MIDI_CB_WR); + else if (*(int *)arg == AIOSYNC_CAPTURE) + *(int *)arg = d->callback(d, MIDI_CB_STOP | MIDI_CB_RD); + else { + splx(s); + DEB(printf("AIOSTOP: bad channel 0x%x\n", *(int *)arg)); + *(int *)arg = 0 ; + } + break ; + + case AIOSYNC: + DEB(printf("AIOSYNC chan 0x%03lx pos %lu unimplemented\n", + ((snd_sync_parm *)arg)->chan, + ((snd_sync_parm *)arg)->pos)); + break; + /* + * here follow the standard ioctls (filio.h etc.) + */ + case FIONREAD: /* get # bytes to read */ + *(int *)arg = d->midi_dbuf_in.rl; + break; + + case FIOASYNC: /*set/clear async i/o */ + DEB( printf("FIOASYNC\n") ; ) + break; + + case FIONBIO: /* set/clear non-blocking i/o */ + if ( *(int *)arg == 0 ) + d->flags &= ~MIDI_F_NBIO ; + else + d->flags |= MIDI_F_NBIO ; + break ; + + case MIOSPASSTHRU: /* set/clear passthru */ + if ( *(int *)arg == 0 ) + d->flags &= ~MIDI_F_PASSTHRU ; + else + d->flags |= MIDI_F_PASSTHRU ; + + /* Init the queue. */ + midibuf_init(&d->midi_dbuf_passthru); + + /* FALLTHROUGH */ + case MIOGPASSTHRU: /* get passthru */ + if ((d->flags & MIDI_F_PASSTHRU) != 0) + (int *)arg = 1; + else + (int *)arg = 0; + break ; + + default: + DEB(printf("default ioctl midi%d subdev %d fn 0x%08x fail\n", + unit, dev & 0xf, cmd)); + ret = EINVAL; + break ; + } + splx(s); + return ret ; +} + +int +midi_poll(dev_t i_dev, int events, struct proc * p) +{ + int unit, dev, ret, s, lim; + mididev_info *d; + + dev = minor(i_dev); + d = get_mididev_info(i_dev, &unit); + + if (d == NULL) + return (ENXIO); + + if (d->poll) + ret = d->poll(i_dev, events, p); + + ret = 0; + s = splmidi(); + + /* Look up the apropriate queue and select it. */ + if ((events & (POLLOUT | POLLWRNORM)) != 0) { + /* Start playing. */ + d->callback(d, MIDI_CB_START | MIDI_CB_WR); + + /* Find out the boundary. */ + if ((d->flags & MIDI_F_HAS_SIZE) != 0) + lim = d->midi_dbuf_out.blocksize; + else + lim = d->midi_dbuf_out.unit_size; + if (d->midi_dbuf_out.fl < lim) + /* No enough space, record select. */ + selrecord(p, &d->midi_dbuf_out.sel); + else + /* We can write now. */ + ret |= events & (POLLOUT | POLLWRNORM); + } + if ((events & (POLLIN | POLLRDNORM)) != 0) { + /* Start recording. */ + d->callback(d, MIDI_CB_START | MIDI_CB_RD); + + /* Find out the boundary. */ + if ((d->flags & MIDI_F_HAS_SIZE) != 0) + lim = d->midi_dbuf_in.blocksize; + else + lim = d->midi_dbuf_in.unit_size; + if (d->midi_dbuf_in.rl < lim) + /* No data ready, record select. */ + selrecord(p, &d->midi_dbuf_in.sel); + else + /* We can write now. */ + ret |= events & (POLLIN | POLLRDNORM); + } + splx(s); + + return (ret); +} + +void +midi_intr(mididev_info *d) +{ + if (d->intr != NULL) + d->intr(d->intrarg, d); +} + +/* + * These handle the status message of the midi drivers. + */ + +int +midistat_open(dev_t i_dev, int flags, int mode, struct proc * p) +{ + if (midistatbusy) + return (EBUSY); + + bzero(midistatbuf, sizeof(midistatbuf)); + midistatptr = 0; + if (midi_initstatus(midistatbuf, sizeof(midistatbuf) - 1)) + return (ENOMEM); + + midistatbusy = 1; + + return (0); +} + +int +midistat_close(dev_t i_dev, int flags, int mode, struct proc * p) +{ + midistatbusy = 0; + + return (0); +} + +int +midistat_read(dev_t i_dev, struct uio * buf, int flag) +{ + return midi_readstatus(midistatbuf, &midistatptr, buf); +} + +/* + * finally, some "libraries" + */ + +/* Inits the buffer for /dev/midistat. */ +static int +midi_initstatus(char *buf, int size) +{ + int i, p; + device_t dev; + mididev_info *md; + + p = 0; + p += snprintf(buf, size, "FreeBSD Midi Driver (newmidi) %s %s\nInstalled devices:\n", __DATE__, __TIME__); + for (i = 0 ; i < NMIDI_MAX ; i++) { + md = &midi_info[i]; + if (!MIDICONFED(md)) + continue; + dev = devclass_get_device(midi_devclass, i); + if (p < size) + p += snprintf(&buf[p], size - p, "midi%d: <%s> %s\n", i, device_get_desc(dev), md->midistat); + else + return (1); + } + + return (0); +} + +/* Reads the status message. */ +static int +midi_readstatus(char *buf, int *ptr, struct uio *uio) +{ + int s, len; + + s = splmidi(); + len = min(uio->uio_resid, strlen(&buf[*ptr])); + if (len > 0) { + uiomove(&buf[*ptr], len, uio); + *ptr += len; + } + splx(s); + + return (0); +} |
