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 #include "em28xx.h" 10 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/hardirq.h> 14 #include <linux/init.h> 15 #include <linux/usb.h> 16 17 #include "em28xx-v4l.h" 18 19 /* ------------------------------------------------------------------ */ 20 21 static int vbi_queue_setup(struct vb2_queue *vq, 22 unsigned int *nbuffers, unsigned int *nplanes, 23 unsigned int sizes[], struct device *alloc_devs[]) 24 { 25 struct em28xx *dev = vb2_get_drv_priv(vq); 26 struct em28xx_v4l2 *v4l2 = dev->v4l2; 27 unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2; 28 29 if (*nbuffers < 2) 30 *nbuffers = 2; 31 32 if (*nplanes) { 33 if (sizes[0] < size) 34 return -EINVAL; 35 size = sizes[0]; 36 } 37 38 *nplanes = 1; 39 sizes[0] = size; 40 41 return 0; 42 } 43 44 static int vbi_buffer_prepare(struct vb2_buffer *vb) 45 { 46 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue); 47 struct em28xx_v4l2 *v4l2 = dev->v4l2; 48 unsigned long size; 49 50 size = v4l2->vbi_width * v4l2->vbi_height * 2; 51 52 if (vb2_plane_size(vb, 0) < size) { 53 dev_info(&dev->intf->dev, 54 "%s data will not fit into plane (%lu < %lu)\n", 55 __func__, vb2_plane_size(vb, 0), size); 56 return -EINVAL; 57 } 58 vb2_set_plane_payload(vb, 0, size); 59 60 return 0; 61 } 62 63 static void 64 vbi_buffer_queue(struct vb2_buffer *vb) 65 { 66 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 67 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue); 68 struct em28xx_buffer *buf = 69 container_of(vbuf, struct em28xx_buffer, vb); 70 struct em28xx_dmaqueue *vbiq = &dev->vbiq; 71 unsigned long flags = 0; 72 73 buf->mem = vb2_plane_vaddr(vb, 0); 74 buf->length = vb2_plane_size(vb, 0); 75 76 spin_lock_irqsave(&dev->slock, flags); 77 list_add_tail(&buf->list, &vbiq->active); 78 spin_unlock_irqrestore(&dev->slock, flags); 79 } 80 81 const struct vb2_ops em28xx_vbi_qops = { 82 .queue_setup = vbi_queue_setup, 83 .buf_prepare = vbi_buffer_prepare, 84 .buf_queue = vbi_buffer_queue, 85 .start_streaming = em28xx_start_analog_streaming, 86 .stop_streaming = em28xx_stop_vbi_streaming, 87 .wait_prepare = vb2_ops_wait_prepare, 88 .wait_finish = vb2_ops_wait_finish, 89 }; 90