1 /* 2 em28xx-vbi.c - VBI driver for em28xx 3 4 Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com> 5 6 This work was sponsored by EyeMagnet Limited. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 2 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 21 02110-1301, USA. 22 */ 23 24 #include <linux/kernel.h> 25 #include <linux/module.h> 26 #include <linux/hardirq.h> 27 #include <linux/init.h> 28 29 #include "em28xx.h" 30 #include "em28xx-v4l.h" 31 32 /* ------------------------------------------------------------------ */ 33 34 static int vbi_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt, 35 unsigned int *nbuffers, unsigned int *nplanes, 36 unsigned int sizes[], void *alloc_ctxs[]) 37 { 38 struct em28xx *dev = vb2_get_drv_priv(vq); 39 struct em28xx_v4l2 *v4l2 = dev->v4l2; 40 unsigned long size; 41 42 if (fmt) 43 size = fmt->fmt.pix.sizeimage; 44 else 45 size = v4l2->vbi_width * v4l2->vbi_height * 2; 46 47 if (0 == *nbuffers) 48 *nbuffers = 32; 49 if (*nbuffers < 2) 50 *nbuffers = 2; 51 if (*nbuffers > 32) 52 *nbuffers = 32; 53 54 *nplanes = 1; 55 sizes[0] = size; 56 57 return 0; 58 } 59 60 static int vbi_buffer_prepare(struct vb2_buffer *vb) 61 { 62 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue); 63 struct em28xx_v4l2 *v4l2 = dev->v4l2; 64 struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb); 65 unsigned long size; 66 67 size = v4l2->vbi_width * v4l2->vbi_height * 2; 68 69 if (vb2_plane_size(vb, 0) < size) { 70 printk(KERN_INFO "%s data will not fit into plane (%lu < %lu)\n", 71 __func__, vb2_plane_size(vb, 0), size); 72 return -EINVAL; 73 } 74 vb2_set_plane_payload(&buf->vb, 0, size); 75 76 return 0; 77 } 78 79 static void 80 vbi_buffer_queue(struct vb2_buffer *vb) 81 { 82 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue); 83 struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb); 84 struct em28xx_dmaqueue *vbiq = &dev->vbiq; 85 unsigned long flags = 0; 86 87 buf->mem = vb2_plane_vaddr(vb, 0); 88 buf->length = vb2_plane_size(vb, 0); 89 90 spin_lock_irqsave(&dev->slock, flags); 91 list_add_tail(&buf->list, &vbiq->active); 92 spin_unlock_irqrestore(&dev->slock, flags); 93 } 94 95 struct vb2_ops em28xx_vbi_qops = { 96 .queue_setup = vbi_queue_setup, 97 .buf_prepare = vbi_buffer_prepare, 98 .buf_queue = vbi_buffer_queue, 99 .start_streaming = em28xx_start_analog_streaming, 100 .stop_streaming = em28xx_stop_vbi_streaming, 101 .wait_prepare = vb2_ops_wait_prepare, 102 .wait_finish = vb2_ops_wait_finish, 103 }; 104