1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 au0828-vbi.c - VBI driver for au0828 4 5 Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com> 6 7 This work was sponsored by GetWellNetwork Inc. 8 9 */ 10 11 #include "au0828.h" 12 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/slab.h> 17 #include <media/v4l2-mc.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 au0828_dev *dev = vb2_get_drv_priv(vq); 26 unsigned long size = dev->vbi_width * dev->vbi_height * 2; 27 28 if (*nplanes) 29 return sizes[0] < size ? -EINVAL : 0; 30 *nplanes = 1; 31 sizes[0] = size; 32 return 0; 33 } 34 35 static int vbi_buffer_prepare(struct vb2_buffer *vb) 36 { 37 struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue); 38 unsigned long size; 39 40 size = dev->vbi_width * dev->vbi_height * 2; 41 42 if (vb2_plane_size(vb, 0) < size) { 43 pr_err("%s data will not fit into plane (%lu < %lu)\n", 44 __func__, vb2_plane_size(vb, 0), size); 45 return -EINVAL; 46 } 47 vb2_set_plane_payload(vb, 0, size); 48 49 return 0; 50 } 51 52 static void 53 vbi_buffer_queue(struct vb2_buffer *vb) 54 { 55 struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue); 56 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 57 struct au0828_buffer *buf = 58 container_of(vbuf, struct au0828_buffer, vb); 59 struct au0828_dmaqueue *vbiq = &dev->vbiq; 60 unsigned long flags = 0; 61 62 buf->mem = vb2_plane_vaddr(vb, 0); 63 buf->length = vb2_plane_size(vb, 0); 64 65 spin_lock_irqsave(&dev->slock, flags); 66 list_add_tail(&buf->list, &vbiq->active); 67 spin_unlock_irqrestore(&dev->slock, flags); 68 } 69 70 const struct vb2_ops au0828_vbi_qops = { 71 .queue_setup = vbi_queue_setup, 72 .buf_prepare = vbi_buffer_prepare, 73 .buf_queue = vbi_buffer_queue, 74 .prepare_streaming = v4l_vb2q_enable_media_source, 75 .start_streaming = au0828_start_analog_streaming, 76 .stop_streaming = au0828_stop_vbi_streaming, 77 .wait_prepare = vb2_ops_wait_prepare, 78 .wait_finish = vb2_ops_wait_finish, 79 }; 80