/* Get buffer to userspace. */
static struct ispstat_buffer *ispstat_buf_get(struct ispstat *stat,
struct ispstat_data *data)
{
int rval = 0;
unsigned long flags;
struct ispstat_buffer *buf;
spin_lock_irqsave(&stat->isp->stat_lock, flags);
while (1) {
buf = ispstat_buf_find_oldest(stat);
if (!buf) {
spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
dev_dbg(stat->isp->dev, "%s: cannot find a buffer.\n",
stat->subdev.name);
return ERR_PTR(-EBUSY);
}
if (ispstat_buf_check_magic(stat, buf)) {
dev_dbg(stat->isp->dev, "%s: current buffer has "
"corrupted data\n.", stat->subdev.name);
/* Mark empty because it doesn't have valid data. */
buf->empty = 1;
} else {
/* Buffer isn't corrupted. */
break;
}
}
stat->locked_buf = buf;
spin_unlock_irqrestore(&stat->isp->stat_lock, flags);
if (buf->buf_size > data->buf_size) {
dev_warn(stat->isp->dev, "%s: userspace's buffer size is "
"not enough.\n", stat->subdev.name);
ispstat_buf_release(stat);
return ERR_PTR(-EINVAL);
}
ispstat_buf_sync_for_cpu(stat, buf);
rval = copy_to_user(data->buf,
buf->virt_addr,
buf->buf_size);
if (rval) {
dev_info(stat->isp->dev,
"%s: failed copying %d bytes of stat data\n",
stat->subdev.name, rval);
buf = ERR_PTR(-EFAULT);
ispstat_buf_release(stat);
}
return buf;
}
static int ispstat_buf_queue(struct ispstat *stat)
{
if (!stat->active_buf)
return STAT_NO_BUF;
do_gettimeofday(&stat->active_buf->ts);
stat->active_buf->buf_size = stat->buf_size;
if (ispstat_buf_check_magic(stat, stat->active_buf)) {
dev_dbg(stat->isp->dev, "%s: data wasn't properly written.\n",
stat->subdev.name);
return STAT_NO_BUF;
}
stat->active_buf->config_counter = stat->config_counter;
stat->active_buf->frame_number = stat->frame_number;
stat->active_buf->empty = 0;
stat->active_buf = NULL;
return STAT_BUF_DONE;
}
