static ssize_t ci_ll_read(struct dvb_ringbuffer *cibuf, struct file *file,
char __user *buf, size_t count, loff_t *ppos)
{
int avail;
int non_blocking = file->f_flags & O_NONBLOCK;
ssize_t len;
if (!cibuf->data || !count)
return 0;
if (non_blocking && (dvb_ringbuffer_empty(cibuf)))
return -EWOULDBLOCK;
if (wait_event_interruptible(cibuf->queue,
!dvb_ringbuffer_empty(cibuf)))
return -ERESTARTSYS;
avail = dvb_ringbuffer_avail(cibuf);
if (avail < 4)
return 0;
len = DVB_RINGBUFFER_PEEK(cibuf, 0) << 8;
len |= DVB_RINGBUFFER_PEEK(cibuf, 1);
if (avail < len + 2 || count < len)
return -EINVAL;
DVB_RINGBUFFER_SKIP(cibuf, 2);
return dvb_ringbuffer_read_user(cibuf, buf, len);
}
static ssize_t dvb_dmxdev_buffer_read(struct dvb_ringbuffer *src,
int non_blocking, char __user *buf,
size_t count, loff_t *ppos)
{
size_t todo;
ssize_t avail;
ssize_t ret = 0;
if (!src->data)
return 0;
if (src->error) {
ret = src->error;
dvb_ringbuffer_flush(src);
return ret;
}
for (todo = count; todo > 0; todo -= ret) {
if (non_blocking && dvb_ringbuffer_empty(src)) {
ret = -EWOULDBLOCK;
break;
}
ret = wait_event_interruptible(src->queue,
!dvb_ringbuffer_empty(src) ||
(src->error != 0));
if (ret < 0)
break;
if (src->error) {
ret = src->error;
dvb_ringbuffer_flush(src);
break;
}
avail = dvb_ringbuffer_avail(src);
if (avail > todo)
avail = todo;
ret = dvb_ringbuffer_read(src, (u8 *)buf, avail, 1);
if (ret < 0)
break;
buf += ret;
}
return (count - todo) ? (count - todo) : ret;
}
/*=============================================================================
Function : kfront_read
Description :
Input :
Output :
Return :
=============================================================================*/
static ssize_t kfront_read(struct file *file, char __user *buf, size_t count,
loff_t *ppos)
{
int avail;
int non_blocking = file->f_flags & O_NONBLOCK;
if (!ci_rbuffer.data || !count)
return 0;
if (non_blocking && (dvb_ringbuffer_empty(&ci_rbuffer)))
return -EWOULDBLOCK;
if (wait_event_interruptible(ci_rbuffer.queue,
!dvb_ringbuffer_empty(&ci_rbuffer)))
return -ERESTARTSYS;
avail = dvb_ringbuffer_avail(&ci_rbuffer);
if (avail < 1)
return 0;
return dvb_ringbuffer_read_user(&ci_rbuffer, buf, 1);
}
/*=============================================================================
Function : kfront_poll
Description :
Input :
Output :
Return :
=============================================================================*/
static unsigned int kfront_poll(struct file *file, poll_table *wait)
{
unsigned int mask = 0;
dprintk("%s: \n", __func__);
poll_wait(file, &ci_rbuffer.queue, wait);
if (!dvb_ringbuffer_empty(&ci_rbuffer))
mask |= (POLLIN | POLLRDNORM);
return mask;
}
static unsigned int dvb_ca_poll (struct file *file, poll_table *wait)
{
struct dvb_device *dvbdev = file->private_data;
struct av7110 *av7110 = dvbdev->priv;
struct dvb_ringbuffer *rbuf = &av7110->ci_rbuffer;
struct dvb_ringbuffer *wbuf = &av7110->ci_wbuffer;
unsigned int mask = 0;
dprintk(8, "av7110:%p\n",av7110);
poll_wait(file, &rbuf->queue, wait);
poll_wait(file, &wbuf->queue, wait);
if (!dvb_ringbuffer_empty(rbuf))
mask |= (POLLIN | POLLRDNORM);
if (dvb_ringbuffer_free(wbuf) > 1024)
mask |= (POLLOUT | POLLWRNORM);
return mask;
}
static unsigned int dvb_dvr_poll(struct file *file, poll_table *wait)
{
struct dvb_device *dvbdev = file->private_data;
struct dmxdev *dmxdev = dvbdev->priv;
unsigned int mask = 0;
dprintk("function : %s\n", __func__);
poll_wait(file, &dmxdev->dvr_buffer.queue, wait);
if ((file->f_flags & O_ACCMODE) == O_RDONLY) {
if (dmxdev->dvr_buffer.error)
mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
if (!dvb_ringbuffer_empty(&dmxdev->dvr_buffer))
mask |= (POLLIN | POLLRDNORM | POLLPRI);
} else
mask |= (POLLOUT | POLLWRNORM | POLLPRI);
return mask;
}
static unsigned int dvb_demux_poll(struct file *file, poll_table *wait)
{
struct dmxdev_filter *dmxdevfilter = file->private_data;
unsigned int mask = 0;
if (!dmxdevfilter)
return -EINVAL;
poll_wait(file, &dmxdevfilter->buffer.queue, wait);
if (dmxdevfilter->state != DMXDEV_STATE_GO &&
dmxdevfilter->state != DMXDEV_STATE_DONE &&
dmxdevfilter->state != DMXDEV_STATE_TIMEDOUT)
return 0;
if (dmxdevfilter->buffer.error)
mask |= (POLLIN | POLLRDNORM | POLLPRI | POLLERR);
if (!dvb_ringbuffer_empty(&dmxdevfilter->buffer))
mask |= (POLLIN | POLLRDNORM | POLLPRI);
return mask;
}
