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color=#555555><FONT color=#000066>[这个贴子最后由luofuchong在
2006/11/21 12:56pm 第 18 次编辑]</FONT> <BR><BR>static
ssize_t smdk2410_audio_read(struct file *file, char
*buffer, <BR>size_t count, loff_t * ppos) <BR>{
<BR>const char *buffer0 = buffer; <BR>audio_stream_t *s
= &input_stream; <BR>int chunksize, ret = 0;
<BR><BR>DPRINTK("audio_read: count=%d\n", count);
<BR><FONT color=red>/*</FONT> <BR><FONT color=red>if
(ppos != &file->f_pos)</FONT> <BR><FONT
color=red>return -ESPIPE;</FONT> <BR><FONT
color=red>*/</FONT> <BR>if (!s->buffers) { <BR>int i;
<BR><BR>if (audio_setup_buf(s)) <BR>return -ENOMEM;
<BR><BR>for (i = 0; i < s->nbfrags; i++) {
<BR>audio_buf_t *b = s->buf;
<BR>down(&b->sem);
<BR>s3c2410_dma_enqueue(s->dma_ch, (void *) b,
b->dma_addr, s->fragsize); <BR>NEXT_BUF(s, buf);
<BR>} <BR>} <BR><BR>while (count > 0) {
<BR>audio_buf_t *b = s->buf; <BR><BR>/* Wait for a
buffer to become full */ <BR>if (file->f_flags &
O_NONBLOCK) { <BR>ret = -EAGAIN; <BR>if
(down_trylock(&b->sem)) <BR>break; <BR>} else {
<BR>ret = -ERESTARTSYS; <BR>if
(down_interruptible(&b->sem)) <BR>break; <BR>}
<BR><BR>chunksize = b->size; <BR>if (chunksize >
count) <BR>chunksize = count; <BR>DPRINTK("read %d from
%d\n", chunksize, s->buf_idx); <BR>if
(copy_to_user(buffer, b->start + s->fragsize -
b->size, <BR>chunksize)) { <BR>up(&b->sem);
<BR>return -EFAULT; <BR>} <BR><BR>b->size -=
chunksize; <BR><BR>buffer += chunksize; <BR>count -=
chunksize; <BR>if (b->size > 0) {
<BR>up(&b->sem); <BR>break; <BR>} <BR><BR>/* Make
current buffer available for DMA again */
<BR>s3c2410_dma_enqueue(s->dma_ch, (void *) b,
b->dma_addr, s->fragsize); <BR><BR>NEXT_BUF(s,
buf); <BR>} <BR><BR>if ((buffer - buffer0)) <BR>ret =
buffer - buffer0; <BR><BR>// DPRINTK("audio_read:
return=%d\n", ret); <BR><BR>return ret; <BR>}
<BR><BR>static int __init audio_init_dma(audio_stream_t
* s, char *desc) <BR>{ <BR>
int ret ; <BR>
s3c2410_dmasrc_t source; <BR>
int hwcfg; <BR> unsigned
long devaddr; <BR> dmach_t
channel; <BR> int dcon;
<BR> unsigned int flags = 0;
<BR><BR> if(s->dma_ch ==
DMA_CH2){ <BR>
channel = 2; <BR>
source = S3C2410_DMASRC_MEM;
<BR>
hwcfg = 3; <BR>
devaddr = 0x55000010; <BR><FONT color=blue>
dcon =
0xa0800000;</FONT> <BR>
flags = S3C2410_DMAF_AUTOSTART;
<BR><BR>
ret = s3c2410_dma_request(s->dma_ch,
&s3c2410iis_dma_out, NULL); <BR>
s3c2410_dma_devconfig(channel, source, hwcfg, devaddr);
<BR>
s3c2410_dma_config(channel, 2, dcon); <BR>
s3c2410_dma_set_buffdone_fn(channel,
audio_dmaout_done_callback); <BR>
s3c2410_dma_setflags(channel, flags); <BR>
s->dma_ok = 1;
<BR>
return ret; <BR> } <BR>
else if(s->dma_ch == DMA_CH1){
<BR><FONT color=red>
channel =1;</FONT> <BR><FONT
color=red>
source =S3C2410_DMASRC_HW;</FONT> <BR><FONT
color=red>
hwcfg =3;</FONT> <BR><FONT color=red>
devaddr =
0x55000010;</FONT> <BR><FONT color=blue>
dcon =
0xa2900000;</FONT> <BR><FONT color=red>
flags =
S3C2410_DMAF_AUTOSTART;</FONT> <BR><BR><FONT
color=red>
ret = s3c2410_dma_request(s->dma_ch,
&s3c2410iis_dma_in, NULL);</FONT> <BR><FONT
color=red>
s3c2410_dma_devconfig(channel, source, hwcfg,
devaddr);</FONT> <BR><FONT color=red>
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