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 <linux/kernel.h> 25 #include <linux/module.h> 26 #include <linux/hardirq.h> 27 #include <linux/init.h> 28 29 #include "em28xx.h" 30 #include "em28xx-v4l.h" 31 32 static unsigned int vbibufs = 5; 33 module_param(vbibufs, int, 0644); 34 MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32"); 35 36 static unsigned int vbi_debug; 37 module_param(vbi_debug, int, 0644); 38 MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]"); 39 40 #define dprintk(level, fmt, arg...) if (vbi_debug >= level) \ 41 printk(KERN_DEBUG "%s: " fmt, dev->core->name , ## arg) 42 43 /* ------------------------------------------------------------------ */ 44 45 static int vbi_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt, 46 unsigned int *nbuffers, unsigned int *nplanes, 47 unsigned int sizes[], void *alloc_ctxs[]) 48 { 49 struct em28xx *dev = vb2_get_drv_priv(vq); 50 struct em28xx_v4l2 *v4l2 = dev->v4l2; 51 unsigned long size; 52 53 if (fmt) 54 size = fmt->fmt.pix.sizeimage; 55 else 56 size = v4l2->vbi_width * v4l2->vbi_height * 2; 57 58 if (0 == *nbuffers) 59 *nbuffers = 32; 60 if (*nbuffers < 2) 61 *nbuffers = 2; 62 if (*nbuffers > 32) 63 *nbuffers = 32; 64 65 *nplanes = 1; 66 sizes[0] = size; 67 68 return 0; 69 } 70 71 static int vbi_buffer_prepare(struct vb2_buffer *vb) 72 { 73 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue); 74 struct em28xx_v4l2 *v4l2 = dev->v4l2; 75 struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb); 76 unsigned long size; 77 78 size = v4l2->vbi_width * v4l2->vbi_height * 2; 79 80 if (vb2_plane_size(vb, 0) < size) { 81 printk(KERN_INFO "%s data will not fit into plane (%lu < %lu)\n", 82 __func__, vb2_plane_size(vb, 0), size); 83 return -EINVAL; 84 } 85 vb2_set_plane_payload(&buf->vb, 0, size); 86 87 return 0; 88 } 89 90 static void 91 vbi_buffer_queue(struct vb2_buffer *vb) 92 { 93 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue); 94 struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb); 95 struct em28xx_dmaqueue *vbiq = &dev->vbiq; 96 unsigned long flags = 0; 97 98 buf->mem = vb2_plane_vaddr(vb, 0); 99 buf->length = vb2_plane_size(vb, 0); 100 101 spin_lock_irqsave(&dev->slock, flags); 102 list_add_tail(&buf->list, &vbiq->active); 103 spin_unlock_irqrestore(&dev->slock, flags); 104 } 105 106 107 struct vb2_ops em28xx_vbi_qops = { 108 .queue_setup = vbi_queue_setup, 109 .buf_prepare = vbi_buffer_prepare, 110 .buf_queue = vbi_buffer_queue, 111 .start_streaming = em28xx_start_analog_streaming, 112 .stop_streaming = em28xx_stop_vbi_streaming, 113 .wait_prepare = vb2_ops_wait_prepare, 114 .wait_finish = vb2_ops_wait_finish, 115 }; 116