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