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Code Issues Releases Activity

fix minor numbers for multi-channel devices

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Submitted by:	Alexander Matey <matey@cis.ohio-state.edu>
This commit is contained in:
Cameron Grant 2000-04-26 20:06:52 +00:00
parent eeb5db2946
commit dd1863690a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=59660
1 changed files with 6 additions and 8 deletions
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14
sys/dev/sound/pcm/sound.c
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@ -59,14 +59,15 @@ static struct cdevsw snd_cdevsw = {
/* bmaj */ -1
};
/* PROPOSAL:
/*
PROPOSAL:
each unit needs:
status, mixer, dsp, dspW, audio, sequencer, midi-in, seq2, sndproc = 9 devices
dspW and audio are deprecated.
dsp needs min 64 channels, will give it 256
minor = (unit << 12) + (dev << 8) + channel
currently minor = (channel << 8) + (unit << 4) + dev
minor = (unit << 20) + (dev << 16) + channel
currently minor = (channel << 16) + (unit << 4) + dev
nomenclature:
/dev/pcmX/dsp.(0..255)
@ -75,16 +76,13 @@ currently minor = (channel << 8) + (unit << 4) + dev
/dev/pcmX/status
/dev/pcmX/mixer
[etc.]
currently:
minor = (channel << 8) + (unit << 4) + dev
*/
#define PCMMINOR(x) (minor(x))
#define PCMCHAN(x) ((PCMMINOR(x) & 0x0000ff00) >> 8)
#define PCMCHAN(x) ((PCMMINOR(x) & 0x0000ff00) >> 16)
#define PCMUNIT(x) ((PCMMINOR(x) & 0x000000f0) >> 4)
#define PCMDEV(x) (PCMMINOR(x) & 0x0000000f)
#define PCMMKMINOR(u, d, c) ((((c) & 0xff) << 8) | (((u) & 0x0f) << 4) | ((d) & 0x0f))
#define PCMMKMINOR(u, d, c) ((((c) & 0xff) << 16) | (((u) & 0x0f) << 4) | ((d) & 0x0f))
static devclass_t pcm_devclass;