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Diffstat (limited to 'kernel/drivers/media/usb/em28xx/em28xx-vbi.c')
-rw-r--r--kernel/drivers/media/usb/em28xx/em28xx-vbi.c103
1 files changed, 103 insertions, 0 deletions
diff --git a/kernel/drivers/media/usb/em28xx/em28xx-vbi.c b/kernel/drivers/media/usb/em28xx/em28xx-vbi.c
new file mode 100644
index 000000000..744e7ed74
--- /dev/null
+++ b/kernel/drivers/media/usb/em28xx/em28xx-vbi.c
@@ -0,0 +1,103 @@
+/*
+ em28xx-vbi.c - VBI driver for em28xx
+
+ Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
+
+ This work was sponsored by EyeMagnet Limited.
+
+ 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 <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/hardirq.h>
+#include <linux/init.h>
+
+#include "em28xx.h"
+#include "em28xx-v4l.h"
+
+/* ------------------------------------------------------------------ */
+
+static int vbi_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
+ unsigned int *nbuffers, unsigned int *nplanes,
+ unsigned int sizes[], void *alloc_ctxs[])
+{
+ struct em28xx *dev = vb2_get_drv_priv(vq);
+ struct em28xx_v4l2 *v4l2 = dev->v4l2;
+ unsigned long size;
+
+ if (fmt)
+ size = fmt->fmt.pix.sizeimage;
+ else
+ size = v4l2->vbi_width * v4l2->vbi_height * 2;
+
+ if (0 == *nbuffers)
+ *nbuffers = 32;
+ if (*nbuffers < 2)
+ *nbuffers = 2;
+ if (*nbuffers > 32)
+ *nbuffers = 32;
+
+ *nplanes = 1;
+ sizes[0] = size;
+
+ return 0;
+}
+
+static int vbi_buffer_prepare(struct vb2_buffer *vb)
+{
+ struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
+ struct em28xx_v4l2 *v4l2 = dev->v4l2;
+ struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
+ unsigned long size;
+
+ size = v4l2->vbi_width * v4l2->vbi_height * 2;
+
+ if (vb2_plane_size(vb, 0) < size) {
+ printk(KERN_INFO "%s data will not fit into plane (%lu < %lu)\n",
+ __func__, vb2_plane_size(vb, 0), size);
+ return -EINVAL;
+ }
+ vb2_set_plane_payload(&buf->vb, 0, size);
+
+ return 0;
+}
+
+static void
+vbi_buffer_queue(struct vb2_buffer *vb)
+{
+ struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
+ struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
+ struct em28xx_dmaqueue *vbiq = &dev->vbiq;
+ unsigned long flags = 0;
+
+ buf->mem = vb2_plane_vaddr(vb, 0);
+ buf->length = vb2_plane_size(vb, 0);
+
+ spin_lock_irqsave(&dev->slock, flags);
+ list_add_tail(&buf->list, &vbiq->active);
+ spin_unlock_irqrestore(&dev->slock, flags);
+}
+
+struct vb2_ops em28xx_vbi_qops = {
+ .queue_setup = vbi_queue_setup,
+ .buf_prepare = vbi_buffer_prepare,
+ .buf_queue = vbi_buffer_queue,
+ .start_streaming = em28xx_start_analog_streaming,
+ .stop_streaming = em28xx_stop_vbi_streaming,
+ .wait_prepare = vb2_ops_wait_prepare,
+ .wait_finish = vb2_ops_wait_finish,
+};