static void *
cs4281chan_init(kobj_t obj, void *devinfo, struct snd_dbuf *b, struct pcm_channel *c, int dir)
{
struct sc_info *sc = devinfo;
struct sc_chinfo *ch = (dir == PCMDIR_PLAY) ? &sc->pch : &sc->rch;
ch->buffer = b;
if (sndbuf_alloc(ch->buffer, sc->parent_dmat, 0, sc->bufsz) != 0) {
return NULL;
}
ch->parent = sc;
ch->channel = c;
ch->fmt = SND_FORMAT(AFMT_U8, 1, 0);
ch->spd = DSP_DEFAULT_SPEED;
ch->bps = 1;
ch->blksz = sndbuf_getsize(ch->buffer);
ch->dma_chan = (dir == PCMDIR_PLAY) ? CS4281_DMA_PLAY : CS4281_DMA_REC;
ch->dma_setup = 0;
adcdac_go(ch, 0);
adcdac_prog(ch);
return ch;
}
static int
cs4281chan_trigger(kobj_t obj, void *data, int go)
{
struct sc_chinfo *ch = data;
switch(go) {
case PCMTRIG_START:
adcdac_prog(ch);
adcdac_go(ch, 1);
break;
case PCMTRIG_ABORT:
adcdac_go(ch, 0);
break;
default:
break;
}
/* return 0 if ok */
return 0;
}
static int
cs4281chan_setblocksize(kobj_t obj, void *data, u_int32_t blocksize)
{
struct sc_chinfo *ch = data;
u_int32_t go;
go = adcdac_go(ch, 0);
/* 2 interrupts are possible and used in buffer (half-empty,empty),
* hence factor of 2. */
ch->blksz = MIN(blocksize, CS4281_BUFFER_SIZE / 2);
sndbuf_resize(ch->buffer, 2, ch->blksz);
ch->dma_setup = 0;
adcdac_prog(ch);
adcdac_go(ch, go);
DEB(printf("cs4281chan_setblocksize: bufsz %d Setting %d\n", blocksize, ch->blksz));
return sndbuf_getsize(ch->buffer);
}
