static int
mp3_ioctl_back(struct inode *inode, struct file *fp, unsigned int command, unsigned long arg)
{
int ret;
while(foregroundUseFlag)
{
// wait for foreground use flag to get set to 0
pnx0106_epics_sleep(10);
}
// Also, need to check if a foreground task is requesting use of the EPICS
// If so, need to backup and block and only unblock and restore when
// it has finished
if(pnx0106_epics_get_exit_decoder())
{
printk("Halting at mp3_ioctl_back\n");
if((ret = backup_block_restore())<0)
{
return ret;
}
}
ret = mp3_ioctl(inode, fp, command, arg);
return ret;
}
static ssize_t mp3_write(struct file *file, const char __user *buf,
size_t count, loff_t *pos)
{
struct mp3 *mp3 = file->private_data;
struct audio_client *ac;
struct audio_buffer *ab;
const char __user *start = buf;
int xfer;
if (!mp3->ac)
mp3_ioctl(file, AUDIO_START, 0);
ac = mp3->ac;
if (!ac)
return -ENODEV;
while (count > 0) {
ab = ac->buf + ac->cpu_buf;
if (ab->used)
wait_event(ac->wait, (ab->used == 0));
xfer = count;
if (xfer > ab->size)
xfer = ab->size;
if (copy_from_user(ab->data, buf, xfer))
return -EFAULT;
buf += xfer;
count -= xfer;
ab->used = xfer;
q6audio_write(ac, ab);
ac->cpu_buf ^= 1;
}
return buf - start;
}