Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1 | /* |
| 2 | * generic helper functions for handling video4linux capture buffers |
| 3 | * |
| 4 | * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> |
| 5 | * |
| 6 | * Highly based on video-buf written originally by: |
| 7 | * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> |
| 8 | * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org> |
| 9 | * (c) 2006 Ted Walther and John Sokol |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 |
| 14 | */ |
| 15 | |
| 16 | #include <linux/init.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/moduleparam.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/interrupt.h> |
| 21 | |
| 22 | #include <media/videobuf-core.h> |
| 23 | |
| 24 | #define MAGIC_BUFFER 0x20070728 |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 25 | #define MAGIC_CHECK(is, should) do { \ |
| 26 | if (unlikely((is) != (should))) { \ |
| 27 | printk(KERN_ERR "magic mismatch: %x (expected %x)\n", is, should); \ |
| 28 | BUG(); } } while (0) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 29 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 30 | static int debug; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 31 | module_param(debug, int, 0644); |
| 32 | |
| 33 | MODULE_DESCRIPTION("helper module to manage video4linux buffers"); |
| 34 | MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); |
| 35 | MODULE_LICENSE("GPL"); |
| 36 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 37 | #define dprintk(level, fmt, arg...) do { \ |
| 38 | if (debug >= level) \ |
| 39 | printk(KERN_DEBUG "vbuf: " fmt , ## arg); } while (0) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 40 | |
| 41 | /* --------------------------------------------------------------------- */ |
| 42 | |
| 43 | #define CALL(q, f, arg...) \ |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 44 | ((q->int_ops->f) ? q->int_ops->f(arg) : 0) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 45 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 46 | void *videobuf_alloc(struct videobuf_queue *q) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 47 | { |
| 48 | struct videobuf_buffer *vb; |
| 49 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 50 | BUG_ON(q->msize < sizeof(*vb)); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 51 | |
| 52 | if (!q->int_ops || !q->int_ops->alloc) { |
| 53 | printk(KERN_ERR "No specific ops defined!\n"); |
| 54 | BUG(); |
| 55 | } |
| 56 | |
| 57 | vb = q->int_ops->alloc(q->msize); |
| 58 | |
| 59 | if (NULL != vb) { |
| 60 | init_waitqueue_head(&vb->done); |
| 61 | vb->magic = MAGIC_BUFFER; |
| 62 | } |
| 63 | |
| 64 | return vb; |
| 65 | } |
| 66 | |
Brandon Philips | 009a905 | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 67 | #define WAITON_CONDITION (vb->state != VIDEOBUF_ACTIVE &&\ |
| 68 | vb->state != VIDEOBUF_QUEUED) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 69 | int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) |
| 70 | { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 71 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
Brandon Philips | 009a905 | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 72 | |
| 73 | if (non_blocking) { |
| 74 | if (WAITON_CONDITION) |
| 75 | return 0; |
| 76 | else |
| 77 | return -EAGAIN; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 78 | } |
Brandon Philips | 009a905 | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 79 | |
| 80 | if (intr) |
| 81 | return wait_event_interruptible(vb->done, WAITON_CONDITION); |
| 82 | else |
| 83 | wait_event(vb->done, WAITON_CONDITION); |
| 84 | |
| 85 | return 0; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 86 | } |
| 87 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 88 | int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb, |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 89 | struct v4l2_framebuffer *fbuf) |
| 90 | { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 91 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
| 92 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 93 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 94 | return CALL(q, iolock, q, vb, fbuf); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 95 | } |
| 96 | |
| 97 | /* --------------------------------------------------------------------- */ |
| 98 | |
| 99 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 100 | void videobuf_queue_core_init(struct videobuf_queue *q, |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 101 | struct videobuf_queue_ops *ops, |
Guennadi Liakhovetski | e9bcf66 | 2008-04-22 14:46:02 -0300 | [diff] [blame] | 102 | struct device *dev, |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 103 | spinlock_t *irqlock, |
| 104 | enum v4l2_buf_type type, |
| 105 | enum v4l2_field field, |
| 106 | unsigned int msize, |
Mauro Carvalho Chehab | d4cae5a | 2007-10-08 12:20:02 -0300 | [diff] [blame] | 107 | void *priv, |
| 108 | struct videobuf_qtype_ops *int_ops) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 109 | { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 110 | memset(q, 0, sizeof(*q)); |
Mauro Carvalho Chehab | d4cae5a | 2007-10-08 12:20:02 -0300 | [diff] [blame] | 111 | q->irqlock = irqlock; |
| 112 | q->dev = dev; |
| 113 | q->type = type; |
| 114 | q->field = field; |
| 115 | q->msize = msize; |
| 116 | q->ops = ops; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 117 | q->priv_data = priv; |
Mauro Carvalho Chehab | d4cae5a | 2007-10-08 12:20:02 -0300 | [diff] [blame] | 118 | q->int_ops = int_ops; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 119 | |
| 120 | /* All buffer operations are mandatory */ |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 121 | BUG_ON(!q->ops->buf_setup); |
| 122 | BUG_ON(!q->ops->buf_prepare); |
| 123 | BUG_ON(!q->ops->buf_queue); |
| 124 | BUG_ON(!q->ops->buf_release); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 125 | |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 126 | /* Lock is mandatory for queue_cancel to work */ |
| 127 | BUG_ON(!irqlock); |
| 128 | |
Mauro Carvalho Chehab | d4cae5a | 2007-10-08 12:20:02 -0300 | [diff] [blame] | 129 | /* Having implementations for abstract methods are mandatory */ |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 130 | BUG_ON(!q->int_ops); |
Mauro Carvalho Chehab | d4cae5a | 2007-10-08 12:20:02 -0300 | [diff] [blame] | 131 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 132 | mutex_init(&q->vb_lock); |
Brandon Philips | 137d1cb | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 133 | init_waitqueue_head(&q->wait); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 134 | INIT_LIST_HEAD(&q->stream); |
| 135 | } |
| 136 | |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 137 | /* Locking: Only usage in bttv unsafe find way to remove */ |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 138 | int videobuf_queue_is_busy(struct videobuf_queue *q) |
| 139 | { |
| 140 | int i; |
| 141 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 142 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 143 | |
| 144 | if (q->streaming) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 145 | dprintk(1, "busy: streaming active\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 146 | return 1; |
| 147 | } |
| 148 | if (q->reading) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 149 | dprintk(1, "busy: pending read #1\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 150 | return 1; |
| 151 | } |
| 152 | if (q->read_buf) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 153 | dprintk(1, "busy: pending read #2\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 154 | return 1; |
| 155 | } |
| 156 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 157 | if (NULL == q->bufs[i]) |
| 158 | continue; |
Mauro Carvalho Chehab | 851c0c9 | 2007-09-27 18:25:44 -0300 | [diff] [blame] | 159 | if (q->bufs[i]->map) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 160 | dprintk(1, "busy: buffer #%d mapped\n", i); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 161 | return 1; |
| 162 | } |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 163 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 164 | dprintk(1, "busy: buffer #%d queued\n", i); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 165 | return 1; |
| 166 | } |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 167 | if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 168 | dprintk(1, "busy: buffer #%d avtive\n", i); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 169 | return 1; |
| 170 | } |
| 171 | } |
| 172 | return 0; |
| 173 | } |
| 174 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 175 | /* Locking: Caller holds q->vb_lock */ |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 176 | void videobuf_queue_cancel(struct videobuf_queue *q) |
| 177 | { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 178 | unsigned long flags = 0; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 179 | int i; |
| 180 | |
Brandon Philips | 137d1cb | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 181 | q->streaming = 0; |
| 182 | q->reading = 0; |
| 183 | wake_up_interruptible_sync(&q->wait); |
| 184 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 185 | /* remove queued buffers from list */ |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 186 | spin_lock_irqsave(q->irqlock, flags); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 187 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 188 | if (NULL == q->bufs[i]) |
| 189 | continue; |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 190 | if (q->bufs[i]->state == VIDEOBUF_QUEUED) { |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 191 | list_del(&q->bufs[i]->queue); |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 192 | q->bufs[i]->state = VIDEOBUF_ERROR; |
Brandon Philips | b608f43 | 2008-04-02 18:10:57 -0300 | [diff] [blame] | 193 | wake_up_all(&q->bufs[i]->done); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 194 | } |
| 195 | } |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 196 | spin_unlock_irqrestore(q->irqlock, flags); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 197 | |
| 198 | /* free all buffers + clear queue */ |
| 199 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 200 | if (NULL == q->bufs[i]) |
| 201 | continue; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 202 | q->ops->buf_release(q, q->bufs[i]); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 203 | } |
| 204 | INIT_LIST_HEAD(&q->stream); |
| 205 | } |
| 206 | |
| 207 | /* --------------------------------------------------------------------- */ |
| 208 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 209 | /* Locking: Caller holds q->vb_lock */ |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 210 | enum v4l2_field videobuf_next_field(struct videobuf_queue *q) |
| 211 | { |
| 212 | enum v4l2_field field = q->field; |
| 213 | |
| 214 | BUG_ON(V4L2_FIELD_ANY == field); |
| 215 | |
| 216 | if (V4L2_FIELD_ALTERNATE == field) { |
| 217 | if (V4L2_FIELD_TOP == q->last) { |
| 218 | field = V4L2_FIELD_BOTTOM; |
| 219 | q->last = V4L2_FIELD_BOTTOM; |
| 220 | } else { |
| 221 | field = V4L2_FIELD_TOP; |
| 222 | q->last = V4L2_FIELD_TOP; |
| 223 | } |
| 224 | } |
| 225 | return field; |
| 226 | } |
| 227 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 228 | /* Locking: Caller holds q->vb_lock */ |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 229 | static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, |
| 230 | struct videobuf_buffer *vb, enum v4l2_buf_type type) |
| 231 | { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 232 | MAGIC_CHECK(vb->magic, MAGIC_BUFFER); |
| 233 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 234 | |
| 235 | b->index = vb->i; |
| 236 | b->type = type; |
| 237 | |
| 238 | b->memory = vb->memory; |
| 239 | switch (b->memory) { |
| 240 | case V4L2_MEMORY_MMAP: |
| 241 | b->m.offset = vb->boff; |
| 242 | b->length = vb->bsize; |
| 243 | break; |
| 244 | case V4L2_MEMORY_USERPTR: |
| 245 | b->m.userptr = vb->baddr; |
| 246 | b->length = vb->bsize; |
| 247 | break; |
| 248 | case V4L2_MEMORY_OVERLAY: |
| 249 | b->m.offset = vb->boff; |
| 250 | break; |
| 251 | } |
| 252 | |
| 253 | b->flags = 0; |
Mauro Carvalho Chehab | 851c0c9 | 2007-09-27 18:25:44 -0300 | [diff] [blame] | 254 | if (vb->map) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 255 | b->flags |= V4L2_BUF_FLAG_MAPPED; |
| 256 | |
| 257 | switch (vb->state) { |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 258 | case VIDEOBUF_PREPARED: |
| 259 | case VIDEOBUF_QUEUED: |
| 260 | case VIDEOBUF_ACTIVE: |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 261 | b->flags |= V4L2_BUF_FLAG_QUEUED; |
| 262 | break; |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 263 | case VIDEOBUF_DONE: |
| 264 | case VIDEOBUF_ERROR: |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 265 | b->flags |= V4L2_BUF_FLAG_DONE; |
| 266 | break; |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 267 | case VIDEOBUF_NEEDS_INIT: |
| 268 | case VIDEOBUF_IDLE: |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 269 | /* nothing */ |
| 270 | break; |
| 271 | } |
| 272 | |
| 273 | if (vb->input != UNSET) { |
| 274 | b->flags |= V4L2_BUF_FLAG_INPUT; |
| 275 | b->input = vb->input; |
| 276 | } |
| 277 | |
| 278 | b->field = vb->field; |
| 279 | b->timestamp = vb->ts; |
| 280 | b->bytesused = vb->size; |
| 281 | b->sequence = vb->field_count >> 1; |
| 282 | } |
| 283 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 284 | /* Locking: Caller holds q->vb_lock */ |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 285 | static int __videobuf_mmap_free(struct videobuf_queue *q) |
| 286 | { |
| 287 | int i; |
| 288 | int rc; |
| 289 | |
| 290 | if (!q) |
| 291 | return 0; |
| 292 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 293 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 294 | |
Mauro Carvalho Chehab | d05051c | 2008-01-10 07:33:03 -0300 | [diff] [blame] | 295 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 296 | rc = CALL(q, mmap_free, q); |
Mauro Carvalho Chehab | d05051c | 2008-01-10 07:33:03 -0300 | [diff] [blame] | 297 | |
| 298 | q->is_mmapped = 0; |
| 299 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 300 | if (rc < 0) |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 301 | return rc; |
| 302 | |
| 303 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 304 | if (NULL == q->bufs[i]) |
| 305 | continue; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 306 | q->ops->buf_release(q, q->bufs[i]); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 307 | kfree(q->bufs[i]); |
| 308 | q->bufs[i] = NULL; |
| 309 | } |
| 310 | |
| 311 | return rc; |
| 312 | } |
| 313 | |
| 314 | int videobuf_mmap_free(struct videobuf_queue *q) |
| 315 | { |
| 316 | int ret; |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 317 | mutex_lock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 318 | ret = __videobuf_mmap_free(q); |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 319 | mutex_unlock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 320 | return ret; |
| 321 | } |
| 322 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 323 | /* Locking: Caller holds q->vb_lock */ |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 324 | static int __videobuf_mmap_setup(struct videobuf_queue *q, |
| 325 | unsigned int bcount, unsigned int bsize, |
| 326 | enum v4l2_memory memory) |
| 327 | { |
| 328 | unsigned int i; |
| 329 | int err; |
| 330 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 331 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 332 | |
| 333 | err = __videobuf_mmap_free(q); |
| 334 | if (0 != err) |
| 335 | return err; |
| 336 | |
| 337 | /* Allocate and initialize buffers */ |
| 338 | for (i = 0; i < bcount; i++) { |
| 339 | q->bufs[i] = videobuf_alloc(q); |
| 340 | |
| 341 | if (q->bufs[i] == NULL) |
| 342 | break; |
| 343 | |
| 344 | q->bufs[i]->i = i; |
| 345 | q->bufs[i]->input = UNSET; |
| 346 | q->bufs[i]->memory = memory; |
| 347 | q->bufs[i]->bsize = bsize; |
| 348 | switch (memory) { |
| 349 | case V4L2_MEMORY_MMAP: |
| 350 | q->bufs[i]->boff = bsize * i; |
| 351 | break; |
| 352 | case V4L2_MEMORY_USERPTR: |
| 353 | case V4L2_MEMORY_OVERLAY: |
| 354 | /* nothing */ |
| 355 | break; |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | if (!i) |
| 360 | return -ENOMEM; |
| 361 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 362 | dprintk(1, "mmap setup: %d buffers, %d bytes each\n", |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 363 | i, bsize); |
| 364 | |
| 365 | return i; |
| 366 | } |
| 367 | |
| 368 | int videobuf_mmap_setup(struct videobuf_queue *q, |
| 369 | unsigned int bcount, unsigned int bsize, |
| 370 | enum v4l2_memory memory) |
| 371 | { |
| 372 | int ret; |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 373 | mutex_lock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 374 | ret = __videobuf_mmap_setup(q, bcount, bsize, memory); |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 375 | mutex_unlock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 376 | return ret; |
| 377 | } |
| 378 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 379 | int videobuf_reqbufs(struct videobuf_queue *q, |
| 380 | struct v4l2_requestbuffers *req) |
| 381 | { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 382 | unsigned int size, count; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 383 | int retval; |
| 384 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 385 | if (req->count < 1) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 386 | dprintk(1, "reqbufs: count invalid (%d)\n", req->count); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 387 | return -EINVAL; |
| 388 | } |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 389 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 390 | if (req->memory != V4L2_MEMORY_MMAP && |
| 391 | req->memory != V4L2_MEMORY_USERPTR && |
| 392 | req->memory != V4L2_MEMORY_OVERLAY) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 393 | dprintk(1, "reqbufs: memory type invalid\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 394 | return -EINVAL; |
| 395 | } |
| 396 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 397 | mutex_lock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 398 | if (req->type != q->type) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 399 | dprintk(1, "reqbufs: queue type invalid\n"); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 400 | retval = -EINVAL; |
| 401 | goto done; |
| 402 | } |
| 403 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 404 | if (q->streaming) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 405 | dprintk(1, "reqbufs: streaming already exists\n"); |
Brandon Philips | 00f98d0 | 2007-09-27 20:55:28 -0300 | [diff] [blame] | 406 | retval = -EBUSY; |
| 407 | goto done; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 408 | } |
| 409 | if (!list_empty(&q->stream)) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 410 | dprintk(1, "reqbufs: stream running\n"); |
Brandon Philips | 00f98d0 | 2007-09-27 20:55:28 -0300 | [diff] [blame] | 411 | retval = -EBUSY; |
| 412 | goto done; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 413 | } |
| 414 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 415 | count = req->count; |
| 416 | if (count > VIDEO_MAX_FRAME) |
| 417 | count = VIDEO_MAX_FRAME; |
| 418 | size = 0; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 419 | q->ops->buf_setup(q, &count, &size); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 420 | size = PAGE_ALIGN(size); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 421 | dprintk(1, "reqbufs: bufs=%d, size=0x%x [%d pages total]\n", |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 422 | count, size, (count*size)>>PAGE_SHIFT); |
| 423 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 424 | retval = __videobuf_mmap_setup(q, count, size, req->memory); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 425 | if (retval < 0) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 426 | dprintk(1, "reqbufs: mmap setup returned %d\n", retval); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 427 | goto done; |
| 428 | } |
| 429 | |
Brandon Philips | 49ee718 | 2007-10-05 16:26:27 -0300 | [diff] [blame] | 430 | req->count = retval; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 431 | |
| 432 | done: |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 433 | mutex_unlock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 434 | return retval; |
| 435 | } |
| 436 | |
| 437 | int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) |
| 438 | { |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 439 | int ret = -EINVAL; |
| 440 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 441 | mutex_lock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 442 | if (unlikely(b->type != q->type)) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 443 | dprintk(1, "querybuf: Wrong type.\n"); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 444 | goto done; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 445 | } |
| 446 | if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 447 | dprintk(1, "querybuf: index out of range.\n"); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 448 | goto done; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 449 | } |
| 450 | if (unlikely(NULL == q->bufs[b->index])) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 451 | dprintk(1, "querybuf: buffer is null.\n"); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 452 | goto done; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 453 | } |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 454 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 455 | videobuf_status(q, b, q->bufs[b->index], q->type); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 456 | |
| 457 | ret = 0; |
| 458 | done: |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 459 | mutex_unlock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 460 | return ret; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | int videobuf_qbuf(struct videobuf_queue *q, |
| 464 | struct v4l2_buffer *b) |
| 465 | { |
| 466 | struct videobuf_buffer *buf; |
| 467 | enum v4l2_field field; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 468 | unsigned long flags = 0; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 469 | int retval; |
| 470 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 471 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 472 | |
Maxim Levitsky | 9900132 | 2007-09-27 20:34:09 -0300 | [diff] [blame] | 473 | if (b->memory == V4L2_MEMORY_MMAP) |
| 474 | down_read(¤t->mm->mmap_sem); |
| 475 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 476 | mutex_lock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 477 | retval = -EBUSY; |
| 478 | if (q->reading) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 479 | dprintk(1, "qbuf: Reading running...\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 480 | goto done; |
| 481 | } |
| 482 | retval = -EINVAL; |
| 483 | if (b->type != q->type) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 484 | dprintk(1, "qbuf: Wrong type.\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 485 | goto done; |
| 486 | } |
| 487 | if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 488 | dprintk(1, "qbuf: index out of range.\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 489 | goto done; |
| 490 | } |
| 491 | buf = q->bufs[b->index]; |
| 492 | if (NULL == buf) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 493 | dprintk(1, "qbuf: buffer is null.\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 494 | goto done; |
| 495 | } |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 496 | MAGIC_CHECK(buf->magic, MAGIC_BUFFER); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 497 | if (buf->memory != b->memory) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 498 | dprintk(1, "qbuf: memory type is wrong.\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 499 | goto done; |
| 500 | } |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 501 | if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 502 | dprintk(1, "qbuf: buffer is already queued or active.\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 503 | goto done; |
| 504 | } |
| 505 | |
| 506 | if (b->flags & V4L2_BUF_FLAG_INPUT) { |
| 507 | if (b->input >= q->inputs) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 508 | dprintk(1, "qbuf: wrong input.\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 509 | goto done; |
| 510 | } |
| 511 | buf->input = b->input; |
| 512 | } else { |
| 513 | buf->input = UNSET; |
| 514 | } |
| 515 | |
| 516 | switch (b->memory) { |
| 517 | case V4L2_MEMORY_MMAP: |
| 518 | if (0 == buf->baddr) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 519 | dprintk(1, "qbuf: mmap requested " |
| 520 | "but buffer addr is zero!\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 521 | goto done; |
| 522 | } |
| 523 | break; |
| 524 | case V4L2_MEMORY_USERPTR: |
| 525 | if (b->length < buf->bsize) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 526 | dprintk(1, "qbuf: buffer length is not enough\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 527 | goto done; |
| 528 | } |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 529 | if (VIDEOBUF_NEEDS_INIT != buf->state && |
| 530 | buf->baddr != b->m.userptr) |
| 531 | q->ops->buf_release(q, buf); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 532 | buf->baddr = b->m.userptr; |
| 533 | break; |
| 534 | case V4L2_MEMORY_OVERLAY: |
| 535 | buf->boff = b->m.offset; |
| 536 | break; |
| 537 | default: |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 538 | dprintk(1, "qbuf: wrong memory type\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 539 | goto done; |
| 540 | } |
| 541 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 542 | dprintk(1, "qbuf: requesting next field\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 543 | field = videobuf_next_field(q); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 544 | retval = q->ops->buf_prepare(q, buf, field); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 545 | if (0 != retval) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 546 | dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 547 | goto done; |
| 548 | } |
| 549 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 550 | list_add_tail(&buf->stream, &q->stream); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 551 | if (q->streaming) { |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 552 | spin_lock_irqsave(q->irqlock, flags); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 553 | q->ops->buf_queue(q, buf); |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 554 | spin_unlock_irqrestore(q->irqlock, flags); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 555 | } |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 556 | dprintk(1, "qbuf: succeded\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 557 | retval = 0; |
Brandon Philips | 137d1cb | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 558 | wake_up_interruptible_sync(&q->wait); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 559 | |
| 560 | done: |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 561 | mutex_unlock(&q->vb_lock); |
Maxim Levitsky | 9900132 | 2007-09-27 20:34:09 -0300 | [diff] [blame] | 562 | |
| 563 | if (b->memory == V4L2_MEMORY_MMAP) |
| 564 | up_read(¤t->mm->mmap_sem); |
| 565 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 566 | return retval; |
| 567 | } |
| 568 | |
Brandon Philips | 137d1cb | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 569 | |
| 570 | /* Locking: Caller holds q->vb_lock */ |
| 571 | static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) |
| 572 | { |
| 573 | int retval; |
| 574 | |
| 575 | checks: |
| 576 | if (!q->streaming) { |
| 577 | dprintk(1, "next_buffer: Not streaming\n"); |
| 578 | retval = -EINVAL; |
| 579 | goto done; |
| 580 | } |
| 581 | |
| 582 | if (list_empty(&q->stream)) { |
| 583 | if (noblock) { |
| 584 | retval = -EAGAIN; |
| 585 | dprintk(2, "next_buffer: no buffers to dequeue\n"); |
| 586 | goto done; |
| 587 | } else { |
| 588 | dprintk(2, "next_buffer: waiting on buffer\n"); |
| 589 | |
| 590 | /* Drop lock to avoid deadlock with qbuf */ |
| 591 | mutex_unlock(&q->vb_lock); |
| 592 | |
| 593 | /* Checking list_empty and streaming is safe without |
| 594 | * locks because we goto checks to validate while |
| 595 | * holding locks before proceeding */ |
| 596 | retval = wait_event_interruptible(q->wait, |
| 597 | !list_empty(&q->stream) || !q->streaming); |
| 598 | mutex_lock(&q->vb_lock); |
| 599 | |
| 600 | if (retval) |
| 601 | goto done; |
| 602 | |
| 603 | goto checks; |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | retval = 0; |
| 608 | |
| 609 | done: |
| 610 | return retval; |
| 611 | } |
| 612 | |
| 613 | |
| 614 | /* Locking: Caller holds q->vb_lock */ |
| 615 | static int stream_next_buffer(struct videobuf_queue *q, |
| 616 | struct videobuf_buffer **vb, int nonblocking) |
| 617 | { |
| 618 | int retval; |
| 619 | struct videobuf_buffer *buf = NULL; |
| 620 | |
| 621 | retval = stream_next_buffer_check_queue(q, nonblocking); |
| 622 | if (retval) |
| 623 | goto done; |
| 624 | |
| 625 | buf = list_entry(q->stream.next, struct videobuf_buffer, stream); |
| 626 | retval = videobuf_waiton(buf, nonblocking, 1); |
| 627 | if (retval < 0) |
| 628 | goto done; |
| 629 | |
| 630 | *vb = buf; |
| 631 | done: |
| 632 | return retval; |
| 633 | } |
| 634 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 635 | int videobuf_dqbuf(struct videobuf_queue *q, |
| 636 | struct v4l2_buffer *b, int nonblocking) |
| 637 | { |
Brandon Philips | 137d1cb | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 638 | struct videobuf_buffer *buf = NULL; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 639 | int retval; |
| 640 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 641 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 642 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 643 | mutex_lock(&q->vb_lock); |
Brandon Philips | 137d1cb | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 644 | |
| 645 | retval = stream_next_buffer(q, &buf, nonblocking); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 646 | if (retval < 0) { |
Brandon Philips | 137d1cb | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 647 | dprintk(1, "dqbuf: next_buffer error: %i\n", retval); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 648 | goto done; |
| 649 | } |
Brandon Philips | 137d1cb | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 650 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 651 | switch (buf->state) { |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 652 | case VIDEOBUF_ERROR: |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 653 | dprintk(1, "dqbuf: state is error\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 654 | retval = -EIO; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 655 | CALL(q, sync, q, buf); |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 656 | buf->state = VIDEOBUF_IDLE; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 657 | break; |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 658 | case VIDEOBUF_DONE: |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 659 | dprintk(1, "dqbuf: state is done\n"); |
| 660 | CALL(q, sync, q, buf); |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 661 | buf->state = VIDEOBUF_IDLE; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 662 | break; |
| 663 | default: |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 664 | dprintk(1, "dqbuf: state invalid\n"); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 665 | retval = -EINVAL; |
| 666 | goto done; |
| 667 | } |
| 668 | list_del(&buf->stream); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 669 | memset(b, 0, sizeof(*b)); |
| 670 | videobuf_status(q, b, buf, q->type); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 671 | |
| 672 | done: |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 673 | mutex_unlock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 674 | return retval; |
| 675 | } |
| 676 | |
| 677 | int videobuf_streamon(struct videobuf_queue *q) |
| 678 | { |
| 679 | struct videobuf_buffer *buf; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 680 | unsigned long flags = 0; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 681 | int retval; |
| 682 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 683 | mutex_lock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 684 | retval = -EBUSY; |
| 685 | if (q->reading) |
| 686 | goto done; |
| 687 | retval = 0; |
| 688 | if (q->streaming) |
| 689 | goto done; |
| 690 | q->streaming = 1; |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 691 | spin_lock_irqsave(q->irqlock, flags); |
Trent Piepho | a991f44 | 2007-10-10 05:37:43 -0300 | [diff] [blame] | 692 | list_for_each_entry(buf, &q->stream, stream) |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 693 | if (buf->state == VIDEOBUF_PREPARED) |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 694 | q->ops->buf_queue(q, buf); |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 695 | spin_unlock_irqrestore(q->irqlock, flags); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 696 | |
Brandon Philips | 137d1cb | 2008-04-02 18:10:59 -0300 | [diff] [blame] | 697 | wake_up_interruptible_sync(&q->wait); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 698 | done: |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 699 | mutex_unlock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 700 | return retval; |
| 701 | } |
| 702 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 703 | /* Locking: Caller holds q->vb_lock */ |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 704 | static int __videobuf_streamoff(struct videobuf_queue *q) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 705 | { |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 706 | if (!q->streaming) |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 707 | return -EINVAL; |
| 708 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 709 | videobuf_queue_cancel(q); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 710 | |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 711 | return 0; |
| 712 | } |
| 713 | |
| 714 | int videobuf_streamoff(struct videobuf_queue *q) |
| 715 | { |
| 716 | int retval; |
| 717 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 718 | mutex_lock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 719 | retval = __videobuf_streamoff(q); |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 720 | mutex_unlock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 721 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 722 | return retval; |
| 723 | } |
| 724 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 725 | /* Locking: Caller holds q->vb_lock */ |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 726 | static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, |
| 727 | char __user *data, |
| 728 | size_t count, loff_t *ppos) |
| 729 | { |
| 730 | enum v4l2_field field; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 731 | unsigned long flags = 0; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 732 | int retval; |
| 733 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 734 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 735 | |
| 736 | /* setup stuff */ |
| 737 | q->read_buf = videobuf_alloc(q); |
| 738 | if (NULL == q->read_buf) |
| 739 | return -ENOMEM; |
| 740 | |
| 741 | q->read_buf->memory = V4L2_MEMORY_USERPTR; |
| 742 | q->read_buf->baddr = (unsigned long)data; |
| 743 | q->read_buf->bsize = count; |
| 744 | |
| 745 | field = videobuf_next_field(q); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 746 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 747 | if (0 != retval) |
| 748 | goto done; |
| 749 | |
| 750 | /* start capture & wait */ |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 751 | spin_lock_irqsave(q->irqlock, flags); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 752 | q->ops->buf_queue(q, q->read_buf); |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 753 | spin_unlock_irqrestore(q->irqlock, flags); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 754 | retval = videobuf_waiton(q->read_buf, 0, 0); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 755 | if (0 == retval) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 756 | CALL(q, sync, q, q->read_buf); |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 757 | if (VIDEOBUF_ERROR == q->read_buf->state) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 758 | retval = -EIO; |
| 759 | else |
| 760 | retval = q->read_buf->size; |
| 761 | } |
| 762 | |
| 763 | done: |
| 764 | /* cleanup */ |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 765 | q->ops->buf_release(q, q->read_buf); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 766 | kfree(q->read_buf); |
| 767 | q->read_buf = NULL; |
| 768 | return retval; |
| 769 | } |
| 770 | |
| 771 | ssize_t videobuf_read_one(struct videobuf_queue *q, |
| 772 | char __user *data, size_t count, loff_t *ppos, |
| 773 | int nonblocking) |
| 774 | { |
| 775 | enum v4l2_field field; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 776 | unsigned long flags = 0; |
Guennadi Liakhovetski | 7daa4a8 | 2008-04-22 14:46:03 -0300 | [diff] [blame] | 777 | unsigned size = 0, nbufs = 1; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 778 | int retval; |
| 779 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 780 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 781 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 782 | mutex_lock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 783 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 784 | q->ops->buf_setup(q, &nbufs, &size); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 785 | |
| 786 | if (NULL == q->read_buf && |
| 787 | count >= size && |
| 788 | !nonblocking) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 789 | retval = videobuf_read_zerocopy(q, data, count, ppos); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 790 | if (retval >= 0 || retval == -EIO) |
| 791 | /* ok, all done */ |
| 792 | goto done; |
| 793 | /* fallback to kernel bounce buffer on failures */ |
| 794 | } |
| 795 | |
| 796 | if (NULL == q->read_buf) { |
| 797 | /* need to capture a new frame */ |
| 798 | retval = -ENOMEM; |
| 799 | q->read_buf = videobuf_alloc(q); |
| 800 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 801 | dprintk(1, "video alloc=0x%p\n", q->read_buf); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 802 | if (NULL == q->read_buf) |
| 803 | goto done; |
| 804 | q->read_buf->memory = V4L2_MEMORY_USERPTR; |
| 805 | q->read_buf->bsize = count; /* preferred size */ |
| 806 | field = videobuf_next_field(q); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 807 | retval = q->ops->buf_prepare(q, q->read_buf, field); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 808 | |
| 809 | if (0 != retval) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 810 | kfree(q->read_buf); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 811 | q->read_buf = NULL; |
| 812 | goto done; |
| 813 | } |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 814 | |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 815 | spin_lock_irqsave(q->irqlock, flags); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 816 | q->ops->buf_queue(q, q->read_buf); |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 817 | spin_unlock_irqrestore(q->irqlock, flags); |
| 818 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 819 | q->read_off = 0; |
| 820 | } |
| 821 | |
| 822 | /* wait until capture is done */ |
| 823 | retval = videobuf_waiton(q->read_buf, nonblocking, 1); |
| 824 | if (0 != retval) |
| 825 | goto done; |
| 826 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 827 | CALL(q, sync, q, q->read_buf); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 828 | |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 829 | if (VIDEOBUF_ERROR == q->read_buf->state) { |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 830 | /* catch I/O errors */ |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 831 | q->ops->buf_release(q, q->read_buf); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 832 | kfree(q->read_buf); |
| 833 | q->read_buf = NULL; |
| 834 | retval = -EIO; |
| 835 | goto done; |
| 836 | } |
| 837 | |
| 838 | /* Copy to userspace */ |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 839 | retval = CALL(q, video_copy_to_user, q, data, count, nonblocking); |
| 840 | if (retval < 0) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 841 | goto done; |
| 842 | |
| 843 | q->read_off += retval; |
| 844 | if (q->read_off == q->read_buf->size) { |
| 845 | /* all data copied, cleanup */ |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 846 | q->ops->buf_release(q, q->read_buf); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 847 | kfree(q->read_buf); |
| 848 | q->read_buf = NULL; |
| 849 | } |
| 850 | |
| 851 | done: |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 852 | mutex_unlock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 853 | return retval; |
| 854 | } |
| 855 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 856 | /* Locking: Caller holds q->vb_lock */ |
Mauro Carvalho Chehab | 225ba90 | 2007-12-12 21:46:26 -0300 | [diff] [blame] | 857 | static int __videobuf_read_start(struct videobuf_queue *q) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 858 | { |
| 859 | enum v4l2_field field; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 860 | unsigned long flags = 0; |
Brandon Philips | 49ee718 | 2007-10-05 16:26:27 -0300 | [diff] [blame] | 861 | unsigned int count = 0, size = 0; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 862 | int err, i; |
| 863 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 864 | q->ops->buf_setup(q, &count, &size); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 865 | if (count < 2) |
| 866 | count = 2; |
| 867 | if (count > VIDEO_MAX_FRAME) |
| 868 | count = VIDEO_MAX_FRAME; |
| 869 | size = PAGE_ALIGN(size); |
| 870 | |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 871 | err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); |
Brandon Philips | 49ee718 | 2007-10-05 16:26:27 -0300 | [diff] [blame] | 872 | if (err < 0) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 873 | return err; |
| 874 | |
Brandon Philips | 49ee718 | 2007-10-05 16:26:27 -0300 | [diff] [blame] | 875 | count = err; |
| 876 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 877 | for (i = 0; i < count; i++) { |
| 878 | field = videobuf_next_field(q); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 879 | err = q->ops->buf_prepare(q, q->bufs[i], field); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 880 | if (err) |
| 881 | return err; |
| 882 | list_add_tail(&q->bufs[i]->stream, &q->stream); |
| 883 | } |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 884 | spin_lock_irqsave(q->irqlock, flags); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 885 | for (i = 0; i < count; i++) |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 886 | q->ops->buf_queue(q, q->bufs[i]); |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 887 | spin_unlock_irqrestore(q->irqlock, flags); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 888 | q->reading = 1; |
| 889 | return 0; |
| 890 | } |
| 891 | |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 892 | static void __videobuf_read_stop(struct videobuf_queue *q) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 893 | { |
| 894 | int i; |
| 895 | |
| 896 | videobuf_queue_cancel(q); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 897 | __videobuf_mmap_free(q); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 898 | INIT_LIST_HEAD(&q->stream); |
| 899 | for (i = 0; i < VIDEO_MAX_FRAME; i++) { |
| 900 | if (NULL == q->bufs[i]) |
| 901 | continue; |
| 902 | kfree(q->bufs[i]); |
| 903 | q->bufs[i] = NULL; |
| 904 | } |
| 905 | q->read_buf = NULL; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 906 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 907 | } |
| 908 | |
Mauro Carvalho Chehab | 19fb145 | 2007-11-15 23:09:30 -0300 | [diff] [blame] | 909 | int videobuf_read_start(struct videobuf_queue *q) |
| 910 | { |
| 911 | int rc; |
| 912 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 913 | mutex_lock(&q->vb_lock); |
Mauro Carvalho Chehab | 19fb145 | 2007-11-15 23:09:30 -0300 | [diff] [blame] | 914 | rc = __videobuf_read_start(q); |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 915 | mutex_unlock(&q->vb_lock); |
Mauro Carvalho Chehab | 19fb145 | 2007-11-15 23:09:30 -0300 | [diff] [blame] | 916 | |
| 917 | return rc; |
| 918 | } |
| 919 | |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 920 | void videobuf_read_stop(struct videobuf_queue *q) |
| 921 | { |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 922 | mutex_lock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 923 | __videobuf_read_stop(q); |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 924 | mutex_unlock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 925 | } |
| 926 | |
| 927 | void videobuf_stop(struct videobuf_queue *q) |
| 928 | { |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 929 | mutex_lock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 930 | |
| 931 | if (q->streaming) |
| 932 | __videobuf_streamoff(q); |
| 933 | |
| 934 | if (q->reading) |
| 935 | __videobuf_read_stop(q); |
| 936 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 937 | mutex_unlock(&q->vb_lock); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 938 | } |
| 939 | |
| 940 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 941 | ssize_t videobuf_read_stream(struct videobuf_queue *q, |
| 942 | char __user *data, size_t count, loff_t *ppos, |
| 943 | int vbihack, int nonblocking) |
| 944 | { |
| 945 | int rc, retval; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 946 | unsigned long flags = 0; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 947 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 948 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 949 | |
Harvey Harrison | 7e28adb | 2008-04-08 23:20:00 -0300 | [diff] [blame] | 950 | dprintk(2, "%s\n", __func__); |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 951 | mutex_lock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 952 | retval = -EBUSY; |
| 953 | if (q->streaming) |
| 954 | goto done; |
| 955 | if (!q->reading) { |
Adrian Bunk | 3f84307 | 2007-12-12 16:44:54 -0300 | [diff] [blame] | 956 | retval = __videobuf_read_start(q); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 957 | if (retval < 0) |
| 958 | goto done; |
| 959 | } |
| 960 | |
| 961 | retval = 0; |
| 962 | while (count > 0) { |
| 963 | /* get / wait for data */ |
| 964 | if (NULL == q->read_buf) { |
| 965 | q->read_buf = list_entry(q->stream.next, |
| 966 | struct videobuf_buffer, |
| 967 | stream); |
| 968 | list_del(&q->read_buf->stream); |
| 969 | q->read_off = 0; |
| 970 | } |
| 971 | rc = videobuf_waiton(q->read_buf, nonblocking, 1); |
| 972 | if (rc < 0) { |
| 973 | if (0 == retval) |
| 974 | retval = rc; |
| 975 | break; |
| 976 | } |
| 977 | |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 978 | if (q->read_buf->state == VIDEOBUF_DONE) { |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 979 | rc = CALL(q, copy_stream, q, data + retval, count, |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 980 | retval, vbihack, nonblocking); |
| 981 | if (rc < 0) { |
| 982 | retval = rc; |
| 983 | break; |
| 984 | } |
| 985 | retval += rc; |
| 986 | count -= rc; |
| 987 | q->read_off += rc; |
| 988 | } else { |
| 989 | /* some error */ |
| 990 | q->read_off = q->read_buf->size; |
| 991 | if (0 == retval) |
| 992 | retval = -EIO; |
| 993 | } |
| 994 | |
| 995 | /* requeue buffer when done with copying */ |
| 996 | if (q->read_off == q->read_buf->size) { |
| 997 | list_add_tail(&q->read_buf->stream, |
| 998 | &q->stream); |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 999 | spin_lock_irqsave(q->irqlock, flags); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 1000 | q->ops->buf_queue(q, q->read_buf); |
Brandon Philips | 0cf4dae | 2008-03-28 10:18:33 -0700 | [diff] [blame^] | 1001 | spin_unlock_irqrestore(q->irqlock, flags); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1002 | q->read_buf = NULL; |
| 1003 | } |
| 1004 | if (retval < 0) |
| 1005 | break; |
| 1006 | } |
| 1007 | |
| 1008 | done: |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 1009 | mutex_unlock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1010 | return retval; |
| 1011 | } |
| 1012 | |
| 1013 | unsigned int videobuf_poll_stream(struct file *file, |
| 1014 | struct videobuf_queue *q, |
| 1015 | poll_table *wait) |
| 1016 | { |
| 1017 | struct videobuf_buffer *buf = NULL; |
| 1018 | unsigned int rc = 0; |
| 1019 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 1020 | mutex_lock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1021 | if (q->streaming) { |
| 1022 | if (!list_empty(&q->stream)) |
| 1023 | buf = list_entry(q->stream.next, |
| 1024 | struct videobuf_buffer, stream); |
| 1025 | } else { |
| 1026 | if (!q->reading) |
Adrian Bunk | 3f84307 | 2007-12-12 16:44:54 -0300 | [diff] [blame] | 1027 | __videobuf_read_start(q); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1028 | if (!q->reading) { |
| 1029 | rc = POLLERR; |
| 1030 | } else if (NULL == q->read_buf) { |
| 1031 | q->read_buf = list_entry(q->stream.next, |
| 1032 | struct videobuf_buffer, |
| 1033 | stream); |
| 1034 | list_del(&q->read_buf->stream); |
| 1035 | q->read_off = 0; |
| 1036 | } |
| 1037 | buf = q->read_buf; |
| 1038 | } |
| 1039 | if (!buf) |
| 1040 | rc = POLLERR; |
| 1041 | |
| 1042 | if (0 == rc) { |
| 1043 | poll_wait(file, &buf->done, wait); |
Brandon Philips | 0fc0686 | 2007-11-06 20:02:36 -0300 | [diff] [blame] | 1044 | if (buf->state == VIDEOBUF_DONE || |
| 1045 | buf->state == VIDEOBUF_ERROR) |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1046 | rc = POLLIN|POLLRDNORM; |
| 1047 | } |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 1048 | mutex_unlock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1049 | return rc; |
| 1050 | } |
| 1051 | |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1052 | int videobuf_mmap_mapper(struct videobuf_queue *q, |
| 1053 | struct vm_area_struct *vma) |
| 1054 | { |
| 1055 | int retval; |
| 1056 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 1057 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1058 | |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 1059 | mutex_lock(&q->vb_lock); |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 1060 | retval = CALL(q, mmap_mapper, q, vma); |
Mauro Carvalho Chehab | d05051c | 2008-01-10 07:33:03 -0300 | [diff] [blame] | 1061 | q->is_mmapped = 1; |
Mauro Carvalho Chehab | 64f9477 | 2008-01-31 13:57:53 -0300 | [diff] [blame] | 1062 | mutex_unlock(&q->vb_lock); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1063 | |
| 1064 | return retval; |
| 1065 | } |
| 1066 | |
| 1067 | #ifdef CONFIG_VIDEO_V4L1_COMPAT |
| 1068 | int videobuf_cgmbuf(struct videobuf_queue *q, |
| 1069 | struct video_mbuf *mbuf, int count) |
| 1070 | { |
| 1071 | struct v4l2_requestbuffers req; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 1072 | int rc, i; |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1073 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 1074 | MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1075 | |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 1076 | memset(&req, 0, sizeof(req)); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1077 | req.type = q->type; |
| 1078 | req.count = count; |
| 1079 | req.memory = V4L2_MEMORY_MMAP; |
Mauro Carvalho Chehab | e2c7731 | 2007-12-10 10:53:20 -0300 | [diff] [blame] | 1080 | rc = videobuf_reqbufs(q, &req); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1081 | if (rc < 0) |
| 1082 | return rc; |
| 1083 | |
| 1084 | mbuf->frames = req.count; |
| 1085 | mbuf->size = 0; |
| 1086 | for (i = 0; i < mbuf->frames; i++) { |
| 1087 | mbuf->offsets[i] = q->bufs[i]->boff; |
| 1088 | mbuf->size += q->bufs[i]->bsize; |
| 1089 | } |
| 1090 | |
| 1091 | return 0; |
| 1092 | } |
Pekka Enberg | a13625c | 2007-10-13 05:54:54 -0300 | [diff] [blame] | 1093 | EXPORT_SYMBOL_GPL(videobuf_cgmbuf); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1094 | #endif |
| 1095 | |
| 1096 | /* --------------------------------------------------------------------- */ |
| 1097 | |
| 1098 | EXPORT_SYMBOL_GPL(videobuf_waiton); |
| 1099 | EXPORT_SYMBOL_GPL(videobuf_iolock); |
| 1100 | |
| 1101 | EXPORT_SYMBOL_GPL(videobuf_alloc); |
| 1102 | |
Mauro Carvalho Chehab | d4cae5a | 2007-10-08 12:20:02 -0300 | [diff] [blame] | 1103 | EXPORT_SYMBOL_GPL(videobuf_queue_core_init); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1104 | EXPORT_SYMBOL_GPL(videobuf_queue_cancel); |
| 1105 | EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); |
| 1106 | |
| 1107 | EXPORT_SYMBOL_GPL(videobuf_next_field); |
| 1108 | EXPORT_SYMBOL_GPL(videobuf_reqbufs); |
| 1109 | EXPORT_SYMBOL_GPL(videobuf_querybuf); |
| 1110 | EXPORT_SYMBOL_GPL(videobuf_qbuf); |
| 1111 | EXPORT_SYMBOL_GPL(videobuf_dqbuf); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1112 | EXPORT_SYMBOL_GPL(videobuf_streamon); |
| 1113 | EXPORT_SYMBOL_GPL(videobuf_streamoff); |
| 1114 | |
Mauro Carvalho Chehab | 19fb145 | 2007-11-15 23:09:30 -0300 | [diff] [blame] | 1115 | EXPORT_SYMBOL_GPL(videobuf_read_start); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1116 | EXPORT_SYMBOL_GPL(videobuf_read_stop); |
Brandon Philips | 19bc513 | 2007-11-13 20:05:38 -0300 | [diff] [blame] | 1117 | EXPORT_SYMBOL_GPL(videobuf_stop); |
Mauro Carvalho Chehab | 7a7d9a8 | 2007-08-23 16:26:14 -0300 | [diff] [blame] | 1118 | EXPORT_SYMBOL_GPL(videobuf_read_stream); |
| 1119 | EXPORT_SYMBOL_GPL(videobuf_read_one); |
| 1120 | EXPORT_SYMBOL_GPL(videobuf_poll_stream); |
| 1121 | |
| 1122 | EXPORT_SYMBOL_GPL(videobuf_mmap_setup); |
| 1123 | EXPORT_SYMBOL_GPL(videobuf_mmap_free); |
| 1124 | EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |