| /* |
| au0828-vbi.c - VBI driver for au0828 |
| |
| Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com> |
| |
| This work was sponsored by GetWellNetwork Inc. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301, USA. |
| */ |
| |
| #include "au0828.h" |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/slab.h> |
| |
| static unsigned int vbibufs = 5; |
| module_param(vbibufs, int, 0644); |
| MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32"); |
| |
| /* ------------------------------------------------------------------ */ |
| |
| static void |
| free_buffer(struct videobuf_queue *vq, struct au0828_buffer *buf) |
| { |
| struct au0828_fh *fh = vq->priv_data; |
| struct au0828_dev *dev = fh->dev; |
| unsigned long flags = 0; |
| if (in_interrupt()) |
| BUG(); |
| |
| /* We used to wait for the buffer to finish here, but this didn't work |
| because, as we were keeping the state as VIDEOBUF_QUEUED, |
| videobuf_queue_cancel marked it as finished for us. |
| (Also, it could wedge forever if the hardware was misconfigured.) |
| |
| This should be safe; by the time we get here, the buffer isn't |
| queued anymore. If we ever start marking the buffers as |
| VIDEOBUF_ACTIVE, it won't be, though. |
| */ |
| spin_lock_irqsave(&dev->slock, flags); |
| if (dev->isoc_ctl.vbi_buf == buf) |
| dev->isoc_ctl.vbi_buf = NULL; |
| spin_unlock_irqrestore(&dev->slock, flags); |
| |
| videobuf_vmalloc_free(&buf->vb); |
| buf->vb.state = VIDEOBUF_NEEDS_INIT; |
| } |
| |
| static int |
| vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size) |
| { |
| struct au0828_fh *fh = q->priv_data; |
| struct au0828_dev *dev = fh->dev; |
| |
| *size = dev->vbi_width * dev->vbi_height * 2; |
| |
| if (0 == *count) |
| *count = vbibufs; |
| if (*count < 2) |
| *count = 2; |
| if (*count > 32) |
| *count = 32; |
| return 0; |
| } |
| |
| static int |
| vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb, |
| enum v4l2_field field) |
| { |
| struct au0828_fh *fh = q->priv_data; |
| struct au0828_dev *dev = fh->dev; |
| struct au0828_buffer *buf = container_of(vb, struct au0828_buffer, vb); |
| int rc = 0; |
| |
| buf->vb.size = dev->vbi_width * dev->vbi_height * 2; |
| |
| if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) |
| return -EINVAL; |
| |
| buf->vb.width = dev->vbi_width; |
| buf->vb.height = dev->vbi_height; |
| buf->vb.field = field; |
| |
| if (VIDEOBUF_NEEDS_INIT == buf->vb.state) { |
| rc = videobuf_iolock(q, &buf->vb, NULL); |
| if (rc < 0) |
| goto fail; |
| } |
| |
| buf->vb.state = VIDEOBUF_PREPARED; |
| return 0; |
| |
| fail: |
| free_buffer(q, buf); |
| return rc; |
| } |
| |
| static void |
| vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb) |
| { |
| struct au0828_buffer *buf = container_of(vb, |
| struct au0828_buffer, |
| vb); |
| struct au0828_fh *fh = vq->priv_data; |
| struct au0828_dev *dev = fh->dev; |
| struct au0828_dmaqueue *vbiq = &dev->vbiq; |
| |
| buf->vb.state = VIDEOBUF_QUEUED; |
| list_add_tail(&buf->vb.queue, &vbiq->active); |
| } |
| |
| static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb) |
| { |
| struct au0828_buffer *buf = container_of(vb, struct au0828_buffer, vb); |
| free_buffer(q, buf); |
| } |
| |
| struct videobuf_queue_ops au0828_vbi_qops = { |
| .buf_setup = vbi_setup, |
| .buf_prepare = vbi_prepare, |
| .buf_queue = vbi_queue, |
| .buf_release = vbi_release, |
| }; |