1 /* 2 au0828-vbi.c - VBI driver for au0828 3 4 Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com> 5 6 This work was sponsored by GetWellNetwork Inc. 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 "au0828.h" 25 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 31 /* ------------------------------------------------------------------ */ 32 33 static int vbi_queue_setup(struct vb2_queue *vq, const void *parg, 34 unsigned int *nbuffers, unsigned int *nplanes, 35 unsigned int sizes[], void *alloc_ctxs[]) 36 { 37 const struct v4l2_format *fmt = parg; 38 struct au0828_dev *dev = vb2_get_drv_priv(vq); 39 unsigned long img_size = dev->vbi_width * dev->vbi_height * 2; 40 unsigned long size; 41 42 size = fmt ? (fmt->fmt.vbi.samples_per_line * 43 (fmt->fmt.vbi.count[0] + fmt->fmt.vbi.count[1])) : img_size; 44 if (size < img_size) 45 return -EINVAL; 46 47 *nplanes = 1; 48 sizes[0] = size; 49 50 return 0; 51 } 52 53 static int vbi_buffer_prepare(struct vb2_buffer *vb) 54 { 55 struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue); 56 unsigned long size; 57 58 size = dev->vbi_width * dev->vbi_height * 2; 59 60 if (vb2_plane_size(vb, 0) < size) { 61 pr_err("%s data will not fit into plane (%lu < %lu)\n", 62 __func__, vb2_plane_size(vb, 0), size); 63 return -EINVAL; 64 } 65 vb2_set_plane_payload(vb, 0, size); 66 67 return 0; 68 } 69 70 static void 71 vbi_buffer_queue(struct vb2_buffer *vb) 72 { 73 struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue); 74 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 75 struct au0828_buffer *buf = 76 container_of(vbuf, struct au0828_buffer, vb); 77 struct au0828_dmaqueue *vbiq = &dev->vbiq; 78 unsigned long flags = 0; 79 80 buf->mem = vb2_plane_vaddr(vb, 0); 81 buf->length = vb2_plane_size(vb, 0); 82 83 spin_lock_irqsave(&dev->slock, flags); 84 list_add_tail(&buf->list, &vbiq->active); 85 spin_unlock_irqrestore(&dev->slock, flags); 86 } 87 88 struct vb2_ops au0828_vbi_qops = { 89 .queue_setup = vbi_queue_setup, 90 .buf_prepare = vbi_buffer_prepare, 91 .buf_queue = vbi_buffer_queue, 92 .start_streaming = au0828_start_analog_streaming, 93 .stop_streaming = au0828_stop_vbi_streaming, 94 .wait_prepare = vb2_ops_wait_prepare, 95 .wait_finish = vb2_ops_wait_finish, 96 }; 97