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_user(src, buf, avail);
if (ret < 0)
break;
buf += ret;
}
return (count - todo) ? (count - todo) : ret;
}
ssize_t mpq_streambuffer_data_read_user(
struct mpq_streambuffer *sbuff,
u8 __user *buf, size_t len)
{
ssize_t actual_len = 0;
if ((NULL == sbuff) || (NULL == buf))
return -EINVAL;
if (MPQ_STREAMBUFFER_BUFFER_MODE_RING == sbuff->mode) {
/*
* Secure buffers are not permitted to be mapped into kernel
* memory, and so buffer base address may be NULL
*/
if (NULL == sbuff->raw_data.data)
return -EPERM;
actual_len = dvb_ringbuffer_avail(&sbuff->raw_data);
if (actual_len < len)
len = actual_len;
if (len)
dvb_ringbuffer_read_user(&sbuff->raw_data, buf, len);
wake_up_all(&sbuff->raw_data.queue);
} else {
/* Linear buffer group */
struct mpq_streambuffer_buffer_desc *desc;
desc = (struct mpq_streambuffer_buffer_desc *)
&sbuff->raw_data.data[sbuff->raw_data.pread];
/*
* Secure buffers are not permitted to be mapped into kernel
* memory, and so buffer base address may be NULL
*/
if (NULL == desc->base)
return -EPERM;
actual_len = (desc->write_ptr - desc->read_ptr);
if (actual_len < len)
len = actual_len;
if (copy_to_user(buf, desc->base + desc->read_ptr, len))
return -EFAULT;
desc->read_ptr += len;
}
return len;
}
/*=============================================================================
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);
}
ssize_t video_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
struct dvb_device *dvbdev = file->private_data;
struct ngene_channel *chan = dvbdev->priv;
struct ngene *dev = chan->dev;
int left, avail;
left = count;
while (left) {
if (wait_event_interruptible(
dev->vin_rbuf.queue,
dvb_ringbuffer_avail(&dev->vin_rbuf) > 0) < 0)
return -EAGAIN;
avail = dvb_ringbuffer_avail(&dev->vin_rbuf);
if (avail > left)
avail = left;
dvb_ringbuffer_read_user(&dev->vin_rbuf, buf, avail);
left -= avail;
buf += avail;
}
return count;
}
