1 files changed, 150 insertions, 0 deletions

diff --git a/drivers/media/video/em28xx/em28xx-vbi.c b/drivers/media/video/em28xx/em28xx-vbi.c
new file mode 100644
index 000000000000..b5802d4cb623
--- /dev/null
+++ b/drivers/media/video/em28xx/em28xx-vbi.c
@@ -0,0 +1,150 @@
+/*
+   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/init.h>
+#include <linux/slab.h>
+
+#include "em28xx.h"
+
+static unsigned int vbibufs = 5;
+module_param(vbibufs,int,0644);
+MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
+
+static unsigned int vbi_debug;
+module_param(vbi_debug,int,0644);
+MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
+
+#define dprintk(level,fmt, arg...)      if (vbi_debug >= level) \
+        printk(KERN_DEBUG "%s: " fmt, dev->core->name , ## arg)
+
+/* ------------------------------------------------------------------ */
+
+static void
+free_buffer(struct videobuf_queue *vq, struct em28xx_buffer *buf)
+{
+        struct em28xx_fh     *fh  = vq->priv_data;
+        struct em28xx        *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)
+{
+        *size = 720 * 12 * 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 em28xx_fh     *fh  = q->priv_data;
+        struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
+        int                  rc = 0;
+        unsigned int size;
+
+        size = 720 * 12 * 2;
+
+        buf->vb.size = size;
+
+        if (0 != buf->vb.baddr  &&  buf->vb.bsize < buf->vb.size)
+                return -EINVAL;
+
+        buf->vb.width  = 720;
+        buf->vb.height = 12;
+        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 em28xx_buffer    *buf     = container_of(vb,
+                                                        struct em28xx_buffer,
+                                                        vb);
+        struct em28xx_fh        *fh      = vq->priv_data;
+        struct em28xx           *dev     = fh->dev;
+        struct em28xx_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 em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
+        free_buffer(q, buf);
+}
+
+struct videobuf_queue_ops em28xx_vbi_qops = {
+        .buf_setup    = vbi_setup,
+        .buf_prepare  = vbi_prepare,
+        .buf_queue    = vbi_queue,
+        .buf_release  = vbi_release,
+};
+
+/* ------------------------------------------------------------------ */
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */