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 "em28xx.h" 25 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/hardirq.h> 29 #include <linux/init.h> 30 31 #include "em28xx-v4l.h" 32 33 /* ------------------------------------------------------------------ */ 34 35 static int vbi_queue_setup(struct vb2_queue *vq, 36 unsigned int *nbuffers, unsigned int *nplanes, 37 unsigned int sizes[], struct device *alloc_devs[]) 38 { 39 struct em28xx *dev = vb2_get_drv_priv(vq); 40 struct em28xx_v4l2 *v4l2 = dev->v4l2; 41 unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2; 42 43 if (*nbuffers < 2) 44 *nbuffers = 2; 45 46 if (*nplanes) { 47 if (sizes[0] < size) 48 return -EINVAL; 49 size = sizes[0]; 50 } 51 52 *nplanes = 1; 53 sizes[0] = size; 54 55 return 0; 56 } 57 58 static int vbi_buffer_prepare(struct vb2_buffer *vb) 59 { 60 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue); 61 struct em28xx_v4l2 *v4l2 = dev->v4l2; 62 unsigned long size; 63 64 size = v4l2->vbi_width * v4l2->vbi_height * 2; 65 66 if (vb2_plane_size(vb, 0) < size) { 67 pr_info("%s data will not fit into plane (%lu < %lu)\n", 68 __func__, vb2_plane_size(vb, 0), size); 69 return -EINVAL; 70 } 71 vb2_set_plane_payload(vb, 0, size); 72 73 return 0; 74 } 75 76 static void 77 vbi_buffer_queue(struct vb2_buffer *vb) 78 { 79 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 80 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue); 81 struct em28xx_buffer *buf = 82 container_of(vbuf, struct em28xx_buffer, vb); 83 struct em28xx_dmaqueue *vbiq = &dev->vbiq; 84 unsigned long flags = 0; 85 86 buf->mem = vb2_plane_vaddr(vb, 0); 87 buf->length = vb2_plane_size(vb, 0); 88 89 spin_lock_irqsave(&dev->slock, flags); 90 list_add_tail(&buf->list, &vbiq->active); 91 spin_unlock_irqrestore(&dev->slock, flags); 92 } 93 94 struct vb2_ops em28xx_vbi_qops = { 95 .queue_setup = vbi_queue_setup, 96 .buf_prepare = vbi_buffer_prepare, 97 .buf_queue = vbi_buffer_queue, 98 .start_streaming = em28xx_start_analog_streaming, 99 .stop_streaming = em28xx_stop_vbi_streaming, 100 .wait_prepare = vb2_ops_wait_prepare, 101 .wait_finish = vb2_ops_wait_finish, 102 }; 103