1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // em28xx-vbi.c - VBI driver for em28xx 4 // 5 // Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com> 6 // 7 // This work was sponsored by EyeMagnet Limited. 8 // 9 // This program is free software; you can redistribute it and/or modify 10 // it under the terms of the GNU General Public License as published by 11 // the Free Software Foundation; either version 2 of the License, or 12 // (at your option) any later version. 13 // 14 // This program is distributed in the hope that it will be useful, 15 // but WITHOUT ANY WARRANTY; without even the implied warranty of 16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 // GNU General Public License for more details. 18 19 #include "em28xx.h" 20 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/hardirq.h> 24 #include <linux/init.h> 25 #include <linux/usb.h> 26 27 #include "em28xx-v4l.h" 28 29 /* ------------------------------------------------------------------ */ 30 31 static int vbi_queue_setup(struct vb2_queue *vq, 32 unsigned int *nbuffers, unsigned int *nplanes, 33 unsigned int sizes[], struct device *alloc_devs[]) 34 { 35 struct em28xx *dev = vb2_get_drv_priv(vq); 36 struct em28xx_v4l2 *v4l2 = dev->v4l2; 37 unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2; 38 39 if (*nbuffers < 2) 40 *nbuffers = 2; 41 42 if (*nplanes) { 43 if (sizes[0] < size) 44 return -EINVAL; 45 size = sizes[0]; 46 } 47 48 *nplanes = 1; 49 sizes[0] = size; 50 51 return 0; 52 } 53 54 static int vbi_buffer_prepare(struct vb2_buffer *vb) 55 { 56 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue); 57 struct em28xx_v4l2 *v4l2 = dev->v4l2; 58 unsigned long size; 59 60 size = v4l2->vbi_width * v4l2->vbi_height * 2; 61 62 if (vb2_plane_size(vb, 0) < size) { 63 dev_info(&dev->intf->dev, 64 "%s data will not fit into plane (%lu < %lu)\n", 65 __func__, vb2_plane_size(vb, 0), size); 66 return -EINVAL; 67 } 68 vb2_set_plane_payload(vb, 0, size); 69 70 return 0; 71 } 72 73 static void 74 vbi_buffer_queue(struct vb2_buffer *vb) 75 { 76 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 77 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue); 78 struct em28xx_buffer *buf = 79 container_of(vbuf, struct em28xx_buffer, vb); 80 struct em28xx_dmaqueue *vbiq = &dev->vbiq; 81 unsigned long flags = 0; 82 83 buf->mem = vb2_plane_vaddr(vb, 0); 84 buf->length = vb2_plane_size(vb, 0); 85 86 spin_lock_irqsave(&dev->slock, flags); 87 list_add_tail(&buf->list, &vbiq->active); 88 spin_unlock_irqrestore(&dev->slock, flags); 89 } 90 91 const struct vb2_ops em28xx_vbi_qops = { 92 .queue_setup = vbi_queue_setup, 93 .buf_prepare = vbi_buffer_prepare, 94 .buf_queue = vbi_buffer_queue, 95 .start_streaming = em28xx_start_analog_streaming, 96 .stop_streaming = em28xx_stop_vbi_streaming, 97 .wait_prepare = vb2_ops_wait_prepare, 98 .wait_finish = vb2_ops_wait_finish, 99 }; 100