Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / media / usb / em28xx / em28xx-vbi.c

diff --git a/kernel/drivers/media/usb/em28xx/em28xx-vbi.c b/kernel/drivers/media/usb/em28xx/em28xx-vbi.c
new file mode 100644 (file)
index 0000000..744e7ed
--- /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,
+};