diff options
Diffstat (limited to 'drivers/media/video/videobuf-core.c')
| -rw-r--r-- | drivers/media/video/videobuf-core.c | 1136 |
1 files changed, 0 insertions, 1136 deletions
diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c deleted file mode 100644 index b7b05842cf2..00000000000 --- a/drivers/media/video/videobuf-core.c +++ /dev/null @@ -1,1136 +0,0 @@ -/* - * generic helper functions for handling video4linux capture buffers - * - * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org> - * - * Highly based on video-buf written originally by: - * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> - * (c) 2006 Mauro Carvalho Chehab, <mchehab@infradead.org> - * (c) 2006 Ted Walther and John Sokol - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 - */ - -#include <linux/init.h> -#include <linux/module.h> -#include <linux/moduleparam.h> -#include <linux/mm.h> -#include <linux/slab.h> -#include <linux/interrupt.h> - -#include <media/videobuf-core.h> - -#define MAGIC_BUFFER 0x20070728 -#define MAGIC_CHECK(is, should) do { \ - if (unlikely((is) != (should))) { \ - printk(KERN_ERR "magic mismatch: %x (expected %x)\n", is, should); \ - BUG(); } } while (0) - -static int debug; -module_param(debug, int, 0644); - -MODULE_DESCRIPTION("helper module to manage video4linux buffers"); -MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>"); -MODULE_LICENSE("GPL"); - -#define dprintk(level, fmt, arg...) do { \ - if (debug >= level) \ - printk(KERN_DEBUG "vbuf: " fmt , ## arg); } while (0) - -/* --------------------------------------------------------------------- */ - -#define CALL(q, f, arg...) \ - ((q->int_ops->f) ? q->int_ops->f(arg) : 0) - -void *videobuf_alloc(struct videobuf_queue *q) -{ - struct videobuf_buffer *vb; - - BUG_ON(q->msize < sizeof(*vb)); - - if (!q->int_ops || !q->int_ops->alloc) { - printk(KERN_ERR "No specific ops defined!\n"); - BUG(); - } - - vb = q->int_ops->alloc(q->msize); - - if (NULL != vb) { - init_waitqueue_head(&vb->done); - vb->magic = MAGIC_BUFFER; - } - - return vb; -} - -#define WAITON_CONDITION (vb->state != VIDEOBUF_ACTIVE &&\ - vb->state != VIDEOBUF_QUEUED) -int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr) -{ - MAGIC_CHECK(vb->magic, MAGIC_BUFFER); - - if (non_blocking) { - if (WAITON_CONDITION) - return 0; - else - return -EAGAIN; - } - - if (intr) - return wait_event_interruptible(vb->done, WAITON_CONDITION); - else - wait_event(vb->done, WAITON_CONDITION); - - return 0; -} - -int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb, - struct v4l2_framebuffer *fbuf) -{ - MAGIC_CHECK(vb->magic, MAGIC_BUFFER); - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - return CALL(q, iolock, q, vb, fbuf); -} - -void *videobuf_queue_to_vmalloc (struct videobuf_queue *q, - struct videobuf_buffer *buf) -{ - if (q->int_ops->vmalloc) - return q->int_ops->vmalloc(buf); - else - return NULL; -} -EXPORT_SYMBOL_GPL(videobuf_queue_to_vmalloc); - -/* --------------------------------------------------------------------- */ - - -void videobuf_queue_core_init(struct videobuf_queue *q, - struct videobuf_queue_ops *ops, - struct device *dev, - spinlock_t *irqlock, - enum v4l2_buf_type type, - enum v4l2_field field, - unsigned int msize, - void *priv, - struct videobuf_qtype_ops *int_ops) -{ - memset(q, 0, sizeof(*q)); - q->irqlock = irqlock; - q->dev = dev; - q->type = type; - q->field = field; - q->msize = msize; - q->ops = ops; - q->priv_data = priv; - q->int_ops = int_ops; - - /* All buffer operations are mandatory */ - BUG_ON(!q->ops->buf_setup); - BUG_ON(!q->ops->buf_prepare); - BUG_ON(!q->ops->buf_queue); - BUG_ON(!q->ops->buf_release); - - /* Lock is mandatory for queue_cancel to work */ - BUG_ON(!irqlock); - - /* Having implementations for abstract methods are mandatory */ - BUG_ON(!q->int_ops); - - mutex_init(&q->vb_lock); - init_waitqueue_head(&q->wait); - INIT_LIST_HEAD(&q->stream); -} - -/* Locking: Only usage in bttv unsafe find way to remove */ -int videobuf_queue_is_busy(struct videobuf_queue *q) -{ - int i; - - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - if (q->streaming) { - dprintk(1, "busy: streaming active\n"); - return 1; - } - if (q->reading) { - dprintk(1, "busy: pending read #1\n"); - return 1; - } - if (q->read_buf) { - dprintk(1, "busy: pending read #2\n"); - return 1; - } - for (i = 0; i < VIDEO_MAX_FRAME; i++) { - if (NULL == q->bufs[i]) - continue; - if (q->bufs[i]->map) { - dprintk(1, "busy: buffer #%d mapped\n", i); - return 1; - } - if (q->bufs[i]->state == VIDEOBUF_QUEUED) { - dprintk(1, "busy: buffer #%d queued\n", i); - return 1; - } - if (q->bufs[i]->state == VIDEOBUF_ACTIVE) { - dprintk(1, "busy: buffer #%d avtive\n", i); - return 1; - } - } - return 0; -} - -/* Locking: Caller holds q->vb_lock */ -void videobuf_queue_cancel(struct videobuf_queue *q) -{ - unsigned long flags = 0; - int i; - - q->streaming = 0; - q->reading = 0; - wake_up_interruptible_sync(&q->wait); - - /* remove queued buffers from list */ - spin_lock_irqsave(q->irqlock, flags); - for (i = 0; i < VIDEO_MAX_FRAME; i++) { - if (NULL == q->bufs[i]) - continue; - if (q->bufs[i]->state == VIDEOBUF_QUEUED) { - list_del(&q->bufs[i]->queue); - q->bufs[i]->state = VIDEOBUF_ERROR; - wake_up_all(&q->bufs[i]->done); - } - } - spin_unlock_irqrestore(q->irqlock, flags); - - /* free all buffers + clear queue */ - for (i = 0; i < VIDEO_MAX_FRAME; i++) { - if (NULL == q->bufs[i]) - continue; - q->ops->buf_release(q, q->bufs[i]); - } - INIT_LIST_HEAD(&q->stream); -} - -/* --------------------------------------------------------------------- */ - -/* Locking: Caller holds q->vb_lock */ -enum v4l2_field videobuf_next_field(struct videobuf_queue *q) -{ - enum v4l2_field field = q->field; - - BUG_ON(V4L2_FIELD_ANY == field); - - if (V4L2_FIELD_ALTERNATE == field) { - if (V4L2_FIELD_TOP == q->last) { - field = V4L2_FIELD_BOTTOM; - q->last = V4L2_FIELD_BOTTOM; - } else { - field = V4L2_FIELD_TOP; - q->last = V4L2_FIELD_TOP; - } - } - return field; -} - -/* Locking: Caller holds q->vb_lock */ -static void videobuf_status(struct videobuf_queue *q, struct v4l2_buffer *b, - struct videobuf_buffer *vb, enum v4l2_buf_type type) -{ - MAGIC_CHECK(vb->magic, MAGIC_BUFFER); - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - b->index = vb->i; - b->type = type; - - b->memory = vb->memory; - switch (b->memory) { - case V4L2_MEMORY_MMAP: - b->m.offset = vb->boff; - b->length = vb->bsize; - break; - case V4L2_MEMORY_USERPTR: - b->m.userptr = vb->baddr; - b->length = vb->bsize; - break; - case V4L2_MEMORY_OVERLAY: - b->m.offset = vb->boff; - break; - } - - b->flags = 0; - if (vb->map) - b->flags |= V4L2_BUF_FLAG_MAPPED; - - switch (vb->state) { - case VIDEOBUF_PREPARED: - case VIDEOBUF_QUEUED: - case VIDEOBUF_ACTIVE: - b->flags |= V4L2_BUF_FLAG_QUEUED; - break; - case VIDEOBUF_DONE: - case VIDEOBUF_ERROR: - b->flags |= V4L2_BUF_FLAG_DONE; - break; - case VIDEOBUF_NEEDS_INIT: - case VIDEOBUF_IDLE: - /* nothing */ - break; - } - - if (vb->input != UNSET) { - b->flags |= V4L2_BUF_FLAG_INPUT; - b->input = vb->input; - } - - b->field = vb->field; - b->timestamp = vb->ts; - b->bytesused = vb->size; - b->sequence = vb->field_count >> 1; -} - -/* Locking: Caller holds q->vb_lock */ -static int __videobuf_mmap_free(struct videobuf_queue *q) -{ - int i; - int rc; - - if (!q) - return 0; - - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - - rc = CALL(q, mmap_free, q); - - q->is_mmapped = 0; - - if (rc < 0) - return rc; - - for (i = 0; i < VIDEO_MAX_FRAME; i++) { - if (NULL == q->bufs[i]) - continue; - q->ops->buf_release(q, q->bufs[i]); - kfree(q->bufs[i]); - q->bufs[i] = NULL; - } - - return rc; -} - -int videobuf_mmap_free(struct videobuf_queue *q) -{ - int ret; - mutex_lock(&q->vb_lock); - ret = __videobuf_mmap_free(q); - mutex_unlock(&q->vb_lock); - return ret; -} - -/* Locking: Caller holds q->vb_lock */ -int __videobuf_mmap_setup(struct videobuf_queue *q, - unsigned int bcount, unsigned int bsize, - enum v4l2_memory memory) -{ - unsigned int i; - int err; - - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - err = __videobuf_mmap_free(q); - if (0 != err) - return err; - - /* Allocate and initialize buffers */ - for (i = 0; i < bcount; i++) { - q->bufs[i] = videobuf_alloc(q); - - if (q->bufs[i] == NULL) - break; - - q->bufs[i]->i = i; - q->bufs[i]->input = UNSET; - q->bufs[i]->memory = memory; - q->bufs[i]->bsize = bsize; - switch (memory) { - case V4L2_MEMORY_MMAP: - q->bufs[i]->boff = bsize * i; - break; - case V4L2_MEMORY_USERPTR: - case V4L2_MEMORY_OVERLAY: - /* nothing */ - break; - } - } - - if (!i) - return -ENOMEM; - - dprintk(1, "mmap setup: %d buffers, %d bytes each\n", - i, bsize); - - return i; -} - -int videobuf_mmap_setup(struct videobuf_queue *q, - unsigned int bcount, unsigned int bsize, - enum v4l2_memory memory) -{ - int ret; - mutex_lock(&q->vb_lock); - ret = __videobuf_mmap_setup(q, bcount, bsize, memory); - mutex_unlock(&q->vb_lock); - return ret; -} - -int videobuf_reqbufs(struct videobuf_queue *q, - struct v4l2_requestbuffers *req) -{ - unsigned int size, count; - int retval; - - if (req->count < 1) { - dprintk(1, "reqbufs: count invalid (%d)\n", req->count); - return -EINVAL; - } - - if (req->memory != V4L2_MEMORY_MMAP && - req->memory != V4L2_MEMORY_USERPTR && - req->memory != V4L2_MEMORY_OVERLAY) { - dprintk(1, "reqbufs: memory type invalid\n"); - return -EINVAL; - } - - mutex_lock(&q->vb_lock); - if (req->type != q->type) { - dprintk(1, "reqbufs: queue type invalid\n"); - retval = -EINVAL; - goto done; - } - - if (q->streaming) { - dprintk(1, "reqbufs: streaming already exists\n"); - retval = -EBUSY; - goto done; - } - if (!list_empty(&q->stream)) { - dprintk(1, "reqbufs: stream running\n"); - retval = -EBUSY; - goto done; - } - - count = req->count; - if (count > VIDEO_MAX_FRAME) - count = VIDEO_MAX_FRAME; - size = 0; - q->ops->buf_setup(q, &count, &size); - size = PAGE_ALIGN(size); - dprintk(1, "reqbufs: bufs=%d, size=0x%x [%d pages total]\n", - count, size, (count*size)>>PAGE_SHIFT); - - retval = __videobuf_mmap_setup(q, count, size, req->memory); - if (retval < 0) { - dprintk(1, "reqbufs: mmap setup returned %d\n", retval); - goto done; - } - - req->count = retval; - - done: - mutex_unlock(&q->vb_lock); - return retval; -} - -int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b) -{ - int ret = -EINVAL; - - mutex_lock(&q->vb_lock); - if (unlikely(b->type != q->type)) { - dprintk(1, "querybuf: Wrong type.\n"); - goto done; - } - if (unlikely(b->index < 0 || b->index >= VIDEO_MAX_FRAME)) { - dprintk(1, "querybuf: index out of range.\n"); - goto done; - } - if (unlikely(NULL == q->bufs[b->index])) { - dprintk(1, "querybuf: buffer is null.\n"); - goto done; - } - - videobuf_status(q, b, q->bufs[b->index], q->type); - - ret = 0; -done: - mutex_unlock(&q->vb_lock); - return ret; -} - -int videobuf_qbuf(struct videobuf_queue *q, - struct v4l2_buffer *b) -{ - struct videobuf_buffer *buf; - enum v4l2_field field; - unsigned long flags = 0; - int retval; - - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - if (b->memory == V4L2_MEMORY_MMAP) - down_read(¤t->mm->mmap_sem); - - mutex_lock(&q->vb_lock); - retval = -EBUSY; - if (q->reading) { - dprintk(1, "qbuf: Reading running...\n"); - goto done; - } - retval = -EINVAL; - if (b->type != q->type) { - dprintk(1, "qbuf: Wrong type.\n"); - goto done; - } - if (b->index < 0 || b->index >= VIDEO_MAX_FRAME) { - dprintk(1, "qbuf: index out of range.\n"); - goto done; - } - buf = q->bufs[b->index]; - if (NULL == buf) { - dprintk(1, "qbuf: buffer is null.\n"); - goto done; - } - MAGIC_CHECK(buf->magic, MAGIC_BUFFER); - if (buf->memory != b->memory) { - dprintk(1, "qbuf: memory type is wrong.\n"); - goto done; - } - if (buf->state != VIDEOBUF_NEEDS_INIT && buf->state != VIDEOBUF_IDLE) { - dprintk(1, "qbuf: buffer is already queued or active.\n"); - goto done; - } - - if (b->flags & V4L2_BUF_FLAG_INPUT) { - if (b->input >= q->inputs) { - dprintk(1, "qbuf: wrong input.\n"); - goto done; - } - buf->input = b->input; - } else { - buf->input = UNSET; - } - - switch (b->memory) { - case V4L2_MEMORY_MMAP: - if (0 == buf->baddr) { - dprintk(1, "qbuf: mmap requested " - "but buffer addr is zero!\n"); - goto done; - } - break; - case V4L2_MEMORY_USERPTR: - if (b->length < buf->bsize) { - dprintk(1, "qbuf: buffer length is not enough\n"); - goto done; - } - if (VIDEOBUF_NEEDS_INIT != buf->state && - buf->baddr != b->m.userptr) - q->ops->buf_release(q, buf); - buf->baddr = b->m.userptr; - break; - case V4L2_MEMORY_OVERLAY: - buf->boff = b->m.offset; - break; - default: - dprintk(1, "qbuf: wrong memory type\n"); - goto done; - } - - dprintk(1, "qbuf: requesting next field\n"); - field = videobuf_next_field(q); - retval = q->ops->buf_prepare(q, buf, field); - if (0 != retval) { - dprintk(1, "qbuf: buffer_prepare returned %d\n", retval); - goto done; - } - - list_add_tail(&buf->stream, &q->stream); - if (q->streaming) { - spin_lock_irqsave(q->irqlock, flags); - q->ops->buf_queue(q, buf); - spin_unlock_irqrestore(q->irqlock, flags); - } - dprintk(1, "qbuf: succeded\n"); - retval = 0; - wake_up_interruptible_sync(&q->wait); - - done: - mutex_unlock(&q->vb_lock); - - if (b->memory == V4L2_MEMORY_MMAP) - up_read(¤t->mm->mmap_sem); - - return retval; -} - - -/* Locking: Caller holds q->vb_lock */ -static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock) -{ - int retval; - -checks: - if (!q->streaming) { - dprintk(1, "next_buffer: Not streaming\n"); - retval = -EINVAL; - goto done; - } - - if (list_empty(&q->stream)) { - if (noblock) { - retval = -EAGAIN; - dprintk(2, "next_buffer: no buffers to dequeue\n"); - goto done; - } else { - dprintk(2, "next_buffer: waiting on buffer\n"); - - /* Drop lock to avoid deadlock with qbuf */ - mutex_unlock(&q->vb_lock); - - /* Checking list_empty and streaming is safe without - * locks because we goto checks to validate while - * holding locks before proceeding */ - retval = wait_event_interruptible(q->wait, - !list_empty(&q->stream) || !q->streaming); - mutex_lock(&q->vb_lock); - - if (retval) - goto done; - - goto checks; - } - } - - retval = 0; - -done: - return retval; -} - - -/* Locking: Caller holds q->vb_lock */ -static int stream_next_buffer(struct videobuf_queue *q, - struct videobuf_buffer **vb, int nonblocking) -{ - int retval; - struct videobuf_buffer *buf = NULL; - - retval = stream_next_buffer_check_queue(q, nonblocking); - if (retval) - goto done; - - buf = list_entry(q->stream.next, struct videobuf_buffer, stream); - retval = videobuf_waiton(buf, nonblocking, 1); - if (retval < 0) - goto done; - - *vb = buf; -done: - return retval; -} - -int videobuf_dqbuf(struct videobuf_queue *q, - struct v4l2_buffer *b, int nonblocking) -{ - struct videobuf_buffer *buf = NULL; - int retval; - - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - mutex_lock(&q->vb_lock); - - retval = stream_next_buffer(q, &buf, nonblocking); - if (retval < 0) { - dprintk(1, "dqbuf: next_buffer error: %i\n", retval); - goto done; - } - - switch (buf->state) { - case VIDEOBUF_ERROR: - dprintk(1, "dqbuf: state is error\n"); - retval = -EIO; - CALL(q, sync, q, buf); - buf->state = VIDEOBUF_IDLE; - break; - case VIDEOBUF_DONE: - dprintk(1, "dqbuf: state is done\n"); - CALL(q, sync, q, buf); - buf->state = VIDEOBUF_IDLE; - break; - default: - dprintk(1, "dqbuf: state invalid\n"); - retval = -EINVAL; - goto done; - } - list_del(&buf->stream); - memset(b, 0, sizeof(*b)); - videobuf_status(q, b, buf, q->type); - - done: - mutex_unlock(&q->vb_lock); - return retval; -} - -int videobuf_streamon(struct videobuf_queue *q) -{ - struct videobuf_buffer *buf; - unsigned long flags = 0; - int retval; - - mutex_lock(&q->vb_lock); - retval = -EBUSY; - if (q->reading) - goto done; - retval = 0; - if (q->streaming) - goto done; - q->streaming = 1; - spin_lock_irqsave(q->irqlock, flags); - list_for_each_entry(buf, &q->stream, stream) - if (buf->state == VIDEOBUF_PREPARED) - q->ops->buf_queue(q, buf); - spin_unlock_irqrestore(q->irqlock, flags); - - wake_up_interruptible_sync(&q->wait); - done: - mutex_unlock(&q->vb_lock); - return retval; -} - -/* Locking: Caller holds q->vb_lock */ -static int __videobuf_streamoff(struct videobuf_queue *q) -{ - if (!q->streaming) - return -EINVAL; - - videobuf_queue_cancel(q); - - return 0; -} - -int videobuf_streamoff(struct videobuf_queue *q) -{ - int retval; - - mutex_lock(&q->vb_lock); - retval = __videobuf_streamoff(q); - mutex_unlock(&q->vb_lock); - - return retval; -} - -/* Locking: Caller holds q->vb_lock */ -static ssize_t videobuf_read_zerocopy(struct videobuf_queue *q, - char __user *data, - size_t count, loff_t *ppos) -{ - enum v4l2_field field; - unsigned long flags = 0; - int retval; - - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - /* setup stuff */ - q->read_buf = videobuf_alloc(q); - if (NULL == q->read_buf) - return -ENOMEM; - - q->read_buf->memory = V4L2_MEMORY_USERPTR; - q->read_buf->baddr = (unsigned long)data; - q->read_buf->bsize = count; - - field = videobuf_next_field(q); - retval = q->ops->buf_prepare(q, q->read_buf, field); - if (0 != retval) - goto done; - - /* start capture & wait */ - spin_lock_irqsave(q->irqlock, flags); - q->ops->buf_queue(q, q->read_buf); - spin_unlock_irqrestore(q->irqlock, flags); - retval = videobuf_waiton(q->read_buf, 0, 0); - if (0 == retval) { - CALL(q, sync, q, q->read_buf); - if (VIDEOBUF_ERROR == q->read_buf->state) - retval = -EIO; - else - retval = q->read_buf->size; - } - - done: - /* cleanup */ - q->ops->buf_release(q, q->read_buf); - kfree(q->read_buf); - q->read_buf = NULL; - return retval; -} - -ssize_t videobuf_read_one(struct videobuf_queue *q, - char __user *data, size_t count, loff_t *ppos, - int nonblocking) -{ - enum v4l2_field field; - unsigned long flags = 0; - unsigned size = 0, nbufs = 1; - int retval; - - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - mutex_lock(&q->vb_lock); - - q->ops->buf_setup(q, &nbufs, &size); - - if (NULL == q->read_buf && - count >= size && - !nonblocking) { - retval = videobuf_read_zerocopy(q, data, count, ppos); - if (retval >= 0 || retval == -EIO) - /* ok, all done */ - goto done; - /* fallback to kernel bounce buffer on failures */ - } - - if (NULL == q->read_buf) { - /* need to capture a new frame */ - retval = -ENOMEM; - q->read_buf = videobuf_alloc(q); - - dprintk(1, "video alloc=0x%p\n", q->read_buf); - if (NULL == q->read_buf) - goto done; - q->read_buf->memory = V4L2_MEMORY_USERPTR; - q->read_buf->bsize = count; /* preferred size */ - field = videobuf_next_field(q); - retval = q->ops->buf_prepare(q, q->read_buf, field); - - if (0 != retval) { - kfree(q->read_buf); - q->read_buf = NULL; - goto done; - } - - spin_lock_irqsave(q->irqlock, flags); - q->ops->buf_queue(q, q->read_buf); - spin_unlock_irqrestore(q->irqlock, flags); - - q->read_off = 0; - } - - /* wait until capture is done */ - retval = videobuf_waiton(q->read_buf, nonblocking, 1); - if (0 != retval) - goto done; - - CALL(q, sync, q, q->read_buf); - - if (VIDEOBUF_ERROR == q->read_buf->state) { - /* catch I/O errors */ - q->ops->buf_release(q, q->read_buf); - kfree(q->read_buf); - q->read_buf = NULL; - retval = -EIO; - goto done; - } - - /* Copy to userspace */ - retval = CALL(q, video_copy_to_user, q, data, count, nonblocking); - if (retval < 0) - goto done; - - q->read_off += retval; - if (q->read_off == q->read_buf->size) { - /* all data copied, cleanup */ - q->ops->buf_release(q, q->read_buf); - kfree(q->read_buf); - q->read_buf = NULL; - } - - done: - mutex_unlock(&q->vb_lock); - return retval; -} - -/* Locking: Caller holds q->vb_lock */ -static int __videobuf_read_start(struct videobuf_queue *q) -{ - enum v4l2_field field; - unsigned long flags = 0; - unsigned int count = 0, size = 0; - int err, i; - - q->ops->buf_setup(q, &count, &size); - if (count < 2) - count = 2; - if (count > VIDEO_MAX_FRAME) - count = VIDEO_MAX_FRAME; - size = PAGE_ALIGN(size); - - err = __videobuf_mmap_setup(q, count, size, V4L2_MEMORY_USERPTR); - if (err < 0) - return err; - - count = err; - - for (i = 0; i < count; i++) { - field = videobuf_next_field(q); - err = q->ops->buf_prepare(q, q->bufs[i], field); - if (err) - return err; - list_add_tail(&q->bufs[i]->stream, &q->stream); - } - spin_lock_irqsave(q->irqlock, flags); - for (i = 0; i < count; i++) - q->ops->buf_queue(q, q->bufs[i]); - spin_unlock_irqrestore(q->irqlock, flags); - q->reading = 1; - return 0; -} - -static void __videobuf_read_stop(struct videobuf_queue *q) -{ - int i; - - videobuf_queue_cancel(q); - __videobuf_mmap_free(q); - INIT_LIST_HEAD(&q->stream); - for (i = 0; i < VIDEO_MAX_FRAME; i++) { - if (NULL == q->bufs[i]) - continue; - kfree(q->bufs[i]); - q->bufs[i] = NULL; - } - q->read_buf = NULL; - -} - -int videobuf_read_start(struct videobuf_queue *q) -{ - int rc; - - mutex_lock(&q->vb_lock); - rc = __videobuf_read_start(q); - mutex_unlock(&q->vb_lock); - - return rc; -} - -void videobuf_read_stop(struct videobuf_queue *q) -{ - mutex_lock(&q->vb_lock); - __videobuf_read_stop(q); - mutex_unlock(&q->vb_lock); -} - -void videobuf_stop(struct videobuf_queue *q) -{ - mutex_lock(&q->vb_lock); - - if (q->streaming) - __videobuf_streamoff(q); - - if (q->reading) - __videobuf_read_stop(q); - - mutex_unlock(&q->vb_lock); -} - - -ssize_t videobuf_read_stream(struct videobuf_queue *q, - char __user *data, size_t count, loff_t *ppos, - int vbihack, int nonblocking) -{ - int rc, retval; - unsigned long flags = 0; - - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - dprintk(2, "%s\n", __func__); - mutex_lock(&q->vb_lock); - retval = -EBUSY; - if (q->streaming) - goto done; - if (!q->reading) { - retval = __videobuf_read_start(q); - if (retval < 0) - goto done; - } - - retval = 0; - while (count > 0) { - /* get / wait for data */ - if (NULL == q->read_buf) { - q->read_buf = list_entry(q->stream.next, - struct videobuf_buffer, - stream); - list_del(&q->read_buf->stream); - q->read_off = 0; - } - rc = videobuf_waiton(q->read_buf, nonblocking, 1); - if (rc < 0) { - if (0 == retval) - retval = rc; - break; - } - - if (q->read_buf->state == VIDEOBUF_DONE) { - rc = CALL(q, copy_stream, q, data + retval, count, - retval, vbihack, nonblocking); - if (rc < 0) { - retval = rc; - break; - } - retval += rc; - count -= rc; - q->read_off += rc; - } else { - /* some error */ - q->read_off = q->read_buf->size; - if (0 == retval) - retval = -EIO; - } - - /* requeue buffer when done with copying */ - if (q->read_off == q->read_buf->size) { - list_add_tail(&q->read_buf->stream, - &q->stream); - spin_lock_irqsave(q->irqlock, flags); - q->ops->buf_queue(q, q->read_buf); - spin_unlock_irqrestore(q->irqlock, flags); - q->read_buf = NULL; - } - if (retval < 0) - break; - } - - done: - mutex_unlock(&q->vb_lock); - return retval; -} - -unsigned int videobuf_poll_stream(struct file *file, - struct videobuf_queue *q, - poll_table *wait) -{ - struct videobuf_buffer *buf = NULL; - unsigned int rc = 0; - - mutex_lock(&q->vb_lock); - if (q->streaming) { - if (!list_empty(&q->stream)) - buf = list_entry(q->stream.next, - struct videobuf_buffer, stream); - } else { - if (!q->reading) - __videobuf_read_start(q); - if (!q->reading) { - rc = POLLERR; - } else if (NULL == q->read_buf) { - q->read_buf = list_entry(q->stream.next, - struct videobuf_buffer, - stream); - list_del(&q->read_buf->stream); - q->read_off = 0; - } - buf = q->read_buf; - } - if (!buf) - rc = POLLERR; - - if (0 == rc) { - poll_wait(file, &buf->done, wait); - if (buf->state == VIDEOBUF_DONE || - buf->state == VIDEOBUF_ERROR) - rc = POLLIN|POLLRDNORM; - } - mutex_unlock(&q->vb_lock); - return rc; -} - -int videobuf_mmap_mapper(struct videobuf_queue *q, - struct vm_area_struct *vma) -{ - int retval; - - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - mutex_lock(&q->vb_lock); - retval = CALL(q, mmap_mapper, q, vma); - q->is_mmapped = 1; - mutex_unlock(&q->vb_lock); - - return retval; -} - -#ifdef CONFIG_VIDEO_V4L1_COMPAT -int videobuf_cgmbuf(struct videobuf_queue *q, - struct video_mbuf *mbuf, int count) -{ - struct v4l2_requestbuffers req; - int rc, i; - - MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS); - - memset(&req, 0, sizeof(req)); - req.type = q->type; - req.count = count; - req.memory = V4L2_MEMORY_MMAP; - rc = videobuf_reqbufs(q, &req); - if (rc < 0) - return rc; - - mbuf->frames = req.count; - mbuf->size = 0; - for (i = 0; i < mbuf->frames; i++) { - mbuf->offsets[i] = q->bufs[i]->boff; - mbuf->size += q->bufs[i]->bsize; - } - - return 0; -} -EXPORT_SYMBOL_GPL(videobuf_cgmbuf); -#endif - -/* --------------------------------------------------------------------- */ - -EXPORT_SYMBOL_GPL(videobuf_waiton); -EXPORT_SYMBOL_GPL(videobuf_iolock); - -EXPORT_SYMBOL_GPL(videobuf_alloc); - -EXPORT_SYMBOL_GPL(videobuf_queue_core_init); -EXPORT_SYMBOL_GPL(videobuf_queue_cancel); -EXPORT_SYMBOL_GPL(videobuf_queue_is_busy); - -EXPORT_SYMBOL_GPL(videobuf_next_field); -EXPORT_SYMBOL_GPL(videobuf_reqbufs); -EXPORT_SYMBOL_GPL(videobuf_querybuf); -EXPORT_SYMBOL_GPL(videobuf_qbuf); -EXPORT_SYMBOL_GPL(videobuf_dqbuf); -EXPORT_SYMBOL_GPL(videobuf_streamon); -EXPORT_SYMBOL_GPL(videobuf_streamoff); - -EXPORT_SYMBOL_GPL(videobuf_read_start); -EXPORT_SYMBOL_GPL(videobuf_read_stop); -EXPORT_SYMBOL_GPL(videobuf_stop); -EXPORT_SYMBOL_GPL(videobuf_read_stream); -EXPORT_SYMBOL_GPL(videobuf_read_one); -EXPORT_SYMBOL_GPL(videobuf_poll_stream); - -EXPORT_SYMBOL_GPL(__videobuf_mmap_setup); -EXPORT_SYMBOL_GPL(videobuf_mmap_setup); -EXPORT_SYMBOL_GPL(videobuf_mmap_free); -EXPORT_SYMBOL_GPL(videobuf_mmap_mapper); |