diff options
Diffstat (limited to 'drivers/media/usb/em28xx/em28xx-vbi.c')
| -rw-r--r-- | drivers/media/usb/em28xx/em28xx-vbi.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-vbi.c b/drivers/media/usb/em28xx/em28xx-vbi.c new file mode 100644 index 0000000..39f39c5 --- /dev/null +++ b/drivers/media/usb/em28xx/em28xx-vbi.c @@ -0,0 +1,112 @@ +/* + 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" + +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 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); + unsigned long size; + + if (fmt) + size = fmt->fmt.pix.sizeimage; + else + size = dev->vbi_width * dev->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_buffer *buf = container_of(vb, struct em28xx_buffer, vb); + unsigned long size; + + size = dev->vbi_width * dev->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, +}; |