Devin Heitmueller | 7f8eacd | 2010-05-29 17:18:45 -0300 | [diff] [blame] | 1 | /* |
| 2 | au0828-vbi.c - VBI driver for au0828 |
| 3 | |
| 4 | Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com> |
| 5 | |
| 6 | This work was sponsored by GetWellNetwork Inc. |
| 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/init.h> |
| 27 | #include <linux/slab.h> |
| 28 | |
| 29 | #include "au0828.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 | /* ------------------------------------------------------------------ */ |
| 36 | |
| 37 | static void |
| 38 | free_buffer(struct videobuf_queue *vq, struct au0828_buffer *buf) |
| 39 | { |
| 40 | struct au0828_fh *fh = vq->priv_data; |
| 41 | struct au0828_dev *dev = fh->dev; |
| 42 | unsigned long flags = 0; |
| 43 | if (in_interrupt()) |
| 44 | BUG(); |
| 45 | |
| 46 | /* We used to wait for the buffer to finish here, but this didn't work |
| 47 | because, as we were keeping the state as VIDEOBUF_QUEUED, |
| 48 | videobuf_queue_cancel marked it as finished for us. |
| 49 | (Also, it could wedge forever if the hardware was misconfigured.) |
| 50 | |
| 51 | This should be safe; by the time we get here, the buffer isn't |
| 52 | queued anymore. If we ever start marking the buffers as |
| 53 | VIDEOBUF_ACTIVE, it won't be, though. |
| 54 | */ |
| 55 | spin_lock_irqsave(&dev->slock, flags); |
| 56 | if (dev->isoc_ctl.vbi_buf == buf) |
| 57 | dev->isoc_ctl.vbi_buf = NULL; |
| 58 | spin_unlock_irqrestore(&dev->slock, flags); |
| 59 | |
| 60 | videobuf_vmalloc_free(&buf->vb); |
| 61 | buf->vb.state = VIDEOBUF_NEEDS_INIT; |
| 62 | } |
| 63 | |
| 64 | static int |
| 65 | vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size) |
| 66 | { |
| 67 | struct au0828_fh *fh = q->priv_data; |
| 68 | struct au0828_dev *dev = fh->dev; |
| 69 | |
| 70 | *size = dev->vbi_width * dev->vbi_height * 2; |
| 71 | |
| 72 | if (0 == *count) |
| 73 | *count = vbibufs; |
| 74 | if (*count < 2) |
| 75 | *count = 2; |
| 76 | if (*count > 32) |
| 77 | *count = 32; |
| 78 | return 0; |
| 79 | } |
| 80 | |
| 81 | static int |
| 82 | vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb, |
| 83 | enum v4l2_field field) |
| 84 | { |
| 85 | struct au0828_fh *fh = q->priv_data; |
| 86 | struct au0828_dev *dev = fh->dev; |
| 87 | struct au0828_buffer *buf = container_of(vb, struct au0828_buffer, vb); |
| 88 | int rc = 0; |
| 89 | |
| 90 | buf->vb.size = dev->vbi_width * dev->vbi_height * 2; |
| 91 | |
| 92 | if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size) |
| 93 | return -EINVAL; |
| 94 | |
| 95 | buf->vb.width = dev->vbi_width; |
| 96 | buf->vb.height = dev->vbi_height; |
| 97 | buf->vb.field = field; |
| 98 | |
| 99 | if (VIDEOBUF_NEEDS_INIT == buf->vb.state) { |
| 100 | rc = videobuf_iolock(q, &buf->vb, NULL); |
| 101 | if (rc < 0) |
| 102 | goto fail; |
| 103 | } |
| 104 | |
| 105 | buf->vb.state = VIDEOBUF_PREPARED; |
| 106 | return 0; |
| 107 | |
| 108 | fail: |
| 109 | free_buffer(q, buf); |
| 110 | return rc; |
| 111 | } |
| 112 | |
| 113 | static void |
| 114 | vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb) |
| 115 | { |
| 116 | struct au0828_buffer *buf = container_of(vb, |
| 117 | struct au0828_buffer, |
| 118 | vb); |
| 119 | struct au0828_fh *fh = vq->priv_data; |
| 120 | struct au0828_dev *dev = fh->dev; |
| 121 | struct au0828_dmaqueue *vbiq = &dev->vbiq; |
| 122 | |
| 123 | buf->vb.state = VIDEOBUF_QUEUED; |
| 124 | list_add_tail(&buf->vb.queue, &vbiq->active); |
| 125 | } |
| 126 | |
| 127 | static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb) |
| 128 | { |
| 129 | struct au0828_buffer *buf = container_of(vb, struct au0828_buffer, vb); |
| 130 | free_buffer(q, buf); |
| 131 | } |
| 132 | |
| 133 | struct videobuf_queue_ops au0828_vbi_qops = { |
| 134 | .buf_setup = vbi_setup, |
| 135 | .buf_prepare = vbi_prepare, |
| 136 | .buf_queue = vbi_queue, |
| 137 | .buf_release = vbi_release, |
| 138 | }; |