#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <media/videobuf-core.h>
#define MAGIC_BUFFER 0x20070728
-#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
- { printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
-
-static int debug = 0;
+#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...) if (debug >= level) \
- printk(KERN_DEBUG "vbuf: " fmt , ## arg)
+#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)
+ ((q->int_ops->f) ? q->int_ops->f(arg) : 0)
-void* videobuf_alloc(struct videobuf_queue* q)
+struct videobuf_buffer *videobuf_alloc(struct videobuf_queue *q)
{
struct videobuf_buffer *vb;
- BUG_ON (q->msize<sizeof(*vb));
+ BUG_ON(q->msize < sizeof(*vb));
if (!q->int_ops || !q->int_ops->alloc) {
printk(KERN_ERR "No specific ops defined!\n");
}
vb = q->int_ops->alloc(q->msize);
-
if (NULL != vb) {
init_waitqueue_head(&vb->done);
- vb->magic = MAGIC_BUFFER;
+ vb->magic = MAGIC_BUFFER;
}
return vb;
}
+EXPORT_SYMBOL_GPL(videobuf_alloc);
+#define WAITON_CONDITION (vb->state != VIDEOBUF_ACTIVE &&\
+ vb->state != VIDEOBUF_QUEUED)
int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr)
{
- int retval = 0;
- DECLARE_WAITQUEUE(wait, current);
+ MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
- MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
- add_wait_queue(&vb->done, &wait);
- while (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED) {
- if (non_blocking) {
- retval = -EAGAIN;
- break;
- }
- set_current_state(intr ? TASK_INTERRUPTIBLE
- : TASK_UNINTERRUPTIBLE);
- if (vb->state == STATE_ACTIVE || vb->state == STATE_QUEUED)
- schedule();
- set_current_state(TASK_RUNNING);
- if (intr && signal_pending(current)) {
- dprintk(1,"buffer waiton: -EINTR\n");
- retval = -EINTR;
- break;
- }
+ if (non_blocking) {
+ if (WAITON_CONDITION)
+ return 0;
+ else
+ return -EAGAIN;
}
- remove_wait_queue(&vb->done, &wait);
- return retval;
+
+ if (intr)
+ return wait_event_interruptible(vb->done, WAITON_CONDITION);
+ else
+ wait_event(vb->done, WAITON_CONDITION);
+
+ return 0;
}
+EXPORT_SYMBOL_GPL(videobuf_waiton);
-int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
+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);
+ MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
- /* FIXME: This is required to avoid OOPS on some cases, since mmap_mapper()
- method should be called before _iolock.
- On some cases, the mmap_mapper() is called only after scheduling.
-
- However, this way is just too dirty! Better to wait for some event.
- */
- schedule_timeout(HZ);
+ return CALL(q, iolock, q, vb, fbuf);
+}
+EXPORT_SYMBOL_GPL(videobuf_iolock);
- return CALL(q,iolock,q,vb,fbuf);
+void *videobuf_queue_to_vaddr(struct videobuf_queue *q,
+ struct videobuf_buffer *buf)
+{
+ if (q->int_ops->vaddr)
+ return q->int_ops->vaddr(buf);
+ return NULL;
}
+EXPORT_SYMBOL_GPL(videobuf_queue_to_vaddr);
/* --------------------------------------------------------------------- */
-void videobuf_queue_core_init(struct videobuf_queue* q,
- struct videobuf_queue_ops *ops,
- void *dev,
+void videobuf_queue_core_init(struct videobuf_queue *q,
+ const struct videobuf_queue_ops *ops,
+ struct device *dev,
spinlock_t *irqlock,
enum v4l2_buf_type type,
enum v4l2_field field,
void *priv,
struct videobuf_qtype_ops *int_ops)
{
- memset(q,0,sizeof(*q));
+ BUG_ON(!q);
+ memset(q, 0, sizeof(*q));
q->irqlock = irqlock;
q->dev = dev;
q->type = type;
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);
+ 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);
+ BUG_ON(!q->int_ops);
- mutex_init(&q->lock);
+ mutex_init(&q->vb_lock);
+ init_waitqueue_head(&q->wait);
INIT_LIST_HEAD(&q->stream);
}
+EXPORT_SYMBOL_GPL(videobuf_queue_core_init);
/* 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);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
if (q->streaming) {
- dprintk(1,"busy: streaming active\n");
+ dprintk(1, "busy: streaming active\n");
return 1;
}
if (q->reading) {
- dprintk(1,"busy: pending read #1\n");
+ dprintk(1, "busy: pending read #1\n");
return 1;
}
if (q->read_buf) {
- dprintk(1,"busy: pending read #2\n");
+ 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);
+ dprintk(1, "busy: buffer #%d mapped\n", i);
return 1;
}
- if (q->bufs[i]->state == STATE_QUEUED) {
- dprintk(1,"busy: buffer #%d queued\n",i);
+ if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
+ dprintk(1, "busy: buffer #%d queued\n", i);
return 1;
}
- if (q->bufs[i]->state == STATE_ACTIVE) {
- dprintk(1,"busy: buffer #%d avtive\n",i);
+ if (q->bufs[i]->state == VIDEOBUF_ACTIVE) {
+ dprintk(1, "busy: buffer #%d avtive\n", i);
return 1;
}
}
return 0;
}
+EXPORT_SYMBOL_GPL(videobuf_queue_is_busy);
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
void videobuf_queue_cancel(struct videobuf_queue *q)
{
- unsigned long flags=0;
+ unsigned long flags = 0;
int i;
+ q->streaming = 0;
+ q->reading = 0;
+ wake_up_interruptible_sync(&q->wait);
+
/* remove queued buffers from list */
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
+ 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 == STATE_QUEUED) {
+ if (q->bufs[i]->state == VIDEOBUF_QUEUED) {
list_del(&q->bufs[i]->queue);
- q->bufs[i]->state = STATE_ERROR;
+ q->bufs[i]->state = VIDEOBUF_ERROR;
+ wake_up_all(&q->bufs[i]->done);
}
}
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
+ 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]);
+ q->ops->buf_release(q, q->bufs[i]);
}
INIT_LIST_HEAD(&q->stream);
}
+EXPORT_SYMBOL_GPL(videobuf_queue_cancel);
/* --------------------------------------------------------------------- */
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
enum v4l2_field videobuf_next_field(struct videobuf_queue *q)
{
enum v4l2_field field = q->field;
}
return field;
}
+EXPORT_SYMBOL_GPL(videobuf_next_field);
-/* Locking: Caller holds q->lock */
+/* 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);
+ MAGIC_CHECK(vb->magic, MAGIC_BUFFER);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
b->index = vb->i;
b->type = type;
b->flags |= V4L2_BUF_FLAG_MAPPED;
switch (vb->state) {
- case STATE_PREPARED:
- case STATE_QUEUED:
- case STATE_ACTIVE:
+ case VIDEOBUF_PREPARED:
+ case VIDEOBUF_QUEUED:
+ case VIDEOBUF_ACTIVE:
b->flags |= V4L2_BUF_FLAG_QUEUED;
break;
- case STATE_DONE:
- case STATE_ERROR:
+ case VIDEOBUF_DONE:
+ case VIDEOBUF_ERROR:
b->flags |= V4L2_BUF_FLAG_DONE;
break;
- case STATE_NEEDS_INIT:
- case STATE_IDLE:
+ case VIDEOBUF_NEEDS_INIT:
+ case VIDEOBUF_IDLE:
/* nothing */
break;
}
b->sequence = vb->field_count >> 1;
}
-/* Locking: Caller holds q->lock */
+/* 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);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
- rc = CALL(q,mmap_free,q);
- if (rc<0)
- return rc;
+ for (i = 0; i < VIDEO_MAX_FRAME; i++)
+ if (q->bufs[i] && q->bufs[i]->map)
+ return -EBUSY;
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (NULL == q->bufs[i])
continue;
- q->ops->buf_release(q,q->bufs[i]);
+ q->ops->buf_release(q, q->bufs[i]);
kfree(q->bufs[i]);
q->bufs[i] = NULL;
}
- return rc;
+ return 0;
}
int videobuf_mmap_free(struct videobuf_queue *q)
{
int ret;
- mutex_lock(&q->lock);
+ mutex_lock(&q->vb_lock);
ret = __videobuf_mmap_free(q);
- mutex_unlock(&q->lock);
+ mutex_unlock(&q->vb_lock);
return ret;
}
+EXPORT_SYMBOL_GPL(videobuf_mmap_free);
-/* Locking: Caller holds q->lock */
-static int __videobuf_mmap_setup(struct videobuf_queue *q,
+/* 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);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
err = __videobuf_mmap_free(q);
if (0 != err)
for (i = 0; i < bcount; i++) {
q->bufs[i] = videobuf_alloc(q);
- if (q->bufs[i] == NULL)
+ if (NULL == q->bufs[i])
break;
q->bufs[i]->i = i;
q->bufs[i]->bsize = bsize;
switch (memory) {
case V4L2_MEMORY_MMAP:
- q->bufs[i]->boff = bsize * i;
+ q->bufs[i]->boff = PAGE_ALIGN(bsize) * i;
break;
case V4L2_MEMORY_USERPTR:
case V4L2_MEMORY_OVERLAY:
if (!i)
return -ENOMEM;
- dprintk(1,"mmap setup: %d buffers, %d bytes each\n",
- i, bsize);
+ dprintk(1, "mmap setup: %d buffers, %d bytes each\n", i, bsize);
return i;
}
+EXPORT_SYMBOL_GPL(__videobuf_mmap_setup);
int videobuf_mmap_setup(struct videobuf_queue *q,
unsigned int bcount, unsigned int bsize,
enum v4l2_memory memory)
{
int ret;
- mutex_lock(&q->lock);
+ mutex_lock(&q->vb_lock);
ret = __videobuf_mmap_setup(q, bcount, bsize, memory);
- mutex_unlock(&q->lock);
+ mutex_unlock(&q->vb_lock);
return ret;
}
+EXPORT_SYMBOL_GPL(videobuf_mmap_setup);
int videobuf_reqbufs(struct videobuf_queue *q,
struct v4l2_requestbuffers *req)
{
- unsigned int size,count;
+ unsigned int size, count;
int retval;
if (req->count < 1) {
- dprintk(1,"reqbufs: count invalid (%d)\n",req->count);
+ 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");
+ dprintk(1, "reqbufs: memory type invalid\n");
return -EINVAL;
}
- mutex_lock(&q->lock);
+ mutex_lock(&q->vb_lock);
if (req->type != q->type) {
- dprintk(1,"reqbufs: queue type invalid\n");
+ dprintk(1, "reqbufs: queue type invalid\n");
retval = -EINVAL;
goto done;
}
if (q->streaming) {
- dprintk(1,"reqbufs: streaming already exists\n");
+ dprintk(1, "reqbufs: streaming already exists\n");
retval = -EBUSY;
goto done;
}
if (!list_empty(&q->stream)) {
- dprintk(1,"reqbufs: stream running\n");
+ dprintk(1, "reqbufs: stream running\n");
retval = -EBUSY;
goto done;
}
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);
+ q->ops->buf_setup(q, &count, &size);
+ dprintk(1, "reqbufs: bufs=%d, size=0x%x [%u pages total]\n",
+ count, size,
+ (unsigned int)((count * PAGE_ALIGN(size)) >> PAGE_SHIFT));
- retval = __videobuf_mmap_setup(q,count,size,req->memory);
+ retval = __videobuf_mmap_setup(q, count, size, req->memory);
if (retval < 0) {
- dprintk(1,"reqbufs: mmap setup returned %d\n",retval);
+ dprintk(1, "reqbufs: mmap setup returned %d\n", retval);
goto done;
}
req->count = retval;
+ retval = 0;
done:
- mutex_unlock(&q->lock);
+ mutex_unlock(&q->vb_lock);
return retval;
}
+EXPORT_SYMBOL_GPL(videobuf_reqbufs);
int videobuf_querybuf(struct videobuf_queue *q, struct v4l2_buffer *b)
{
int ret = -EINVAL;
- mutex_lock(&q->lock);
+ mutex_lock(&q->vb_lock);
if (unlikely(b->type != q->type)) {
- dprintk(1,"querybuf: Wrong type.\n");
+ 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");
+ if (unlikely(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");
+ dprintk(1, "querybuf: buffer is null.\n");
goto done;
}
- videobuf_status(q,b,q->bufs[b->index],q->type);
+ videobuf_status(q, b, q->bufs[b->index], q->type);
ret = 0;
done:
- mutex_unlock(&q->lock);
+ mutex_unlock(&q->vb_lock);
return ret;
}
+EXPORT_SYMBOL_GPL(videobuf_querybuf);
-int videobuf_qbuf(struct videobuf_queue *q,
- struct v4l2_buffer *b)
+int videobuf_qbuf(struct videobuf_queue *q, struct v4l2_buffer *b)
{
struct videobuf_buffer *buf;
enum v4l2_field field;
- unsigned long flags=0;
+ unsigned long flags = 0;
int retval;
- MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
if (b->memory == V4L2_MEMORY_MMAP)
down_read(¤t->mm->mmap_sem);
- mutex_lock(&q->lock);
+ mutex_lock(&q->vb_lock);
retval = -EBUSY;
if (q->reading) {
- dprintk(1,"qbuf: Reading running...\n");
+ dprintk(1, "qbuf: Reading running...\n");
goto done;
}
retval = -EINVAL;
if (b->type != q->type) {
- dprintk(1,"qbuf: Wrong type.\n");
+ 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");
+ if (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");
+ dprintk(1, "qbuf: buffer is null.\n");
goto done;
}
- MAGIC_CHECK(buf->magic,MAGIC_BUFFER);
+ MAGIC_CHECK(buf->magic, MAGIC_BUFFER);
if (buf->memory != b->memory) {
- dprintk(1,"qbuf: memory type is wrong.\n");
+ dprintk(1, "qbuf: memory type is wrong.\n");
goto done;
}
- if (buf->state != STATE_NEEDS_INIT && buf->state != STATE_IDLE) {
- dprintk(1,"qbuf: buffer is already queued or active.\n");
+ 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");
+ dprintk(1, "qbuf: wrong input.\n");
goto done;
}
buf->input = b->input;
switch (b->memory) {
case V4L2_MEMORY_MMAP:
if (0 == buf->baddr) {
- dprintk(1,"qbuf: mmap requested but buffer addr is zero!\n");
+ 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");
+ dprintk(1, "qbuf: buffer length is not enough\n");
goto done;
}
- if (STATE_NEEDS_INIT != buf->state && buf->baddr != b->m.userptr)
- q->ops->buf_release(q,buf);
+ 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");
+ dprintk(1, "qbuf: wrong memory type\n");
goto done;
}
- dprintk(1,"qbuf: requesting next field\n");
+ dprintk(1, "qbuf: requesting next field\n");
field = videobuf_next_field(q);
- retval = q->ops->buf_prepare(q,buf,field);
+ retval = q->ops->buf_prepare(q, buf, field);
if (0 != retval) {
- dprintk(1,"qbuf: buffer_prepare returned %d\n",retval);
+ dprintk(1, "qbuf: buffer_prepare returned %d\n", retval);
goto done;
}
- list_add_tail(&buf->stream,&q->stream);
+ list_add_tail(&buf->stream, &q->stream);
if (q->streaming) {
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(q,buf);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
+ spin_lock_irqsave(q->irqlock, flags);
+ q->ops->buf_queue(q, buf);
+ spin_unlock_irqrestore(q->irqlock, flags);
}
- dprintk(1,"qbuf: succeded\n");
+ dprintk(1, "qbuf: succeeded\n");
retval = 0;
+ wake_up_interruptible_sync(&q->wait);
- done:
- mutex_unlock(&q->lock);
+done:
+ mutex_unlock(&q->vb_lock);
if (b->memory == V4L2_MEMORY_MMAP)
up_read(¤t->mm->mmap_sem);
return retval;
}
+EXPORT_SYMBOL_GPL(videobuf_qbuf);
-int videobuf_dqbuf(struct videobuf_queue *q,
- struct v4l2_buffer *b, int nonblocking)
+/* Locking: Caller holds q->vb_lock */
+static int stream_next_buffer_check_queue(struct videobuf_queue *q, int noblock)
{
- struct videobuf_buffer *buf;
int retval;
- MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
-
- mutex_lock(&q->lock);
- retval = -EBUSY;
- if (q->reading) {
- dprintk(1,"dqbuf: Reading running...\n");
- goto done;
- }
- retval = -EINVAL;
- if (b->type != q->type) {
- dprintk(1,"dqbuf: Wrong type.\n");
+checks:
+ if (!q->streaming) {
+ dprintk(1, "next_buffer: Not streaming\n");
+ retval = -EINVAL;
goto done;
}
+
if (list_empty(&q->stream)) {
- dprintk(1,"dqbuf: stream running\n");
- goto done;
+ 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: waiton returned %d\n",retval);
+ dprintk(1, "dqbuf: next_buffer error: %i\n", retval);
goto done;
}
+
switch (buf->state) {
- case STATE_ERROR:
- dprintk(1,"dqbuf: state is error\n");
+ case VIDEOBUF_ERROR:
+ dprintk(1, "dqbuf: state is error\n");
retval = -EIO;
- CALL(q,sync,q, buf);
- buf->state = STATE_IDLE;
+ CALL(q, sync, q, buf);
+ buf->state = VIDEOBUF_IDLE;
break;
- case STATE_DONE:
- dprintk(1,"dqbuf: state is done\n");
- CALL(q,sync,q, buf);
- buf->state = STATE_IDLE;
+ 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");
+ 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->lock);
+ memset(b, 0, sizeof(*b));
+ videobuf_status(q, b, buf, q->type);
+done:
+ mutex_unlock(&q->vb_lock);
return retval;
}
+EXPORT_SYMBOL_GPL(videobuf_dqbuf);
int videobuf_streamon(struct videobuf_queue *q)
{
struct videobuf_buffer *buf;
- unsigned long flags=0;
+ unsigned long flags = 0;
int retval;
- mutex_lock(&q->lock);
+ mutex_lock(&q->vb_lock);
retval = -EBUSY;
if (q->reading)
goto done;
if (q->streaming)
goto done;
q->streaming = 1;
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
+ spin_lock_irqsave(q->irqlock, flags);
list_for_each_entry(buf, &q->stream, stream)
- if (buf->state == STATE_PREPARED)
- q->ops->buf_queue(q,buf);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
+ if (buf->state == VIDEOBUF_PREPARED)
+ q->ops->buf_queue(q, buf);
+ spin_unlock_irqrestore(q->irqlock, flags);
- done:
- mutex_unlock(&q->lock);
+ wake_up_interruptible_sync(&q->wait);
+done:
+ mutex_unlock(&q->vb_lock);
return retval;
}
+EXPORT_SYMBOL_GPL(videobuf_streamon);
-/* Locking: Caller holds q->lock */
+/* Locking: Caller holds q->vb_lock */
static int __videobuf_streamoff(struct videobuf_queue *q)
{
if (!q->streaming)
return -EINVAL;
videobuf_queue_cancel(q);
- q->streaming = 0;
return 0;
}
{
int retval;
- mutex_lock(&q->lock);
+ mutex_lock(&q->vb_lock);
retval = __videobuf_streamoff(q);
- mutex_unlock(&q->lock);
+ mutex_unlock(&q->vb_lock);
return retval;
}
+EXPORT_SYMBOL_GPL(videobuf_streamoff);
-/* Locking: Caller holds q->lock */
+/* 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;
+ unsigned long flags = 0;
int retval;
- MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
/* setup stuff */
q->read_buf = videobuf_alloc(q);
q->read_buf->bsize = count;
field = videobuf_next_field(q);
- retval = q->ops->buf_prepare(q,q->read_buf,field);
+ retval = q->ops->buf_prepare(q, q->read_buf, field);
if (0 != retval)
goto done;
/* start capture & wait */
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(q,q->read_buf);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
- retval = videobuf_waiton(q->read_buf,0,0);
+ 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 (STATE_ERROR == q->read_buf->state)
+ CALL(q, sync, q, q->read_buf);
+ if (VIDEOBUF_ERROR == q->read_buf->state)
retval = -EIO;
else
retval = q->read_buf->size;
}
- done:
+done:
/* cleanup */
- q->ops->buf_release(q,q->read_buf);
+ q->ops->buf_release(q, q->read_buf);
kfree(q->read_buf);
q->read_buf = NULL;
return retval;
}
+static int __videobuf_copy_to_user(struct videobuf_queue *q,
+ struct videobuf_buffer *buf,
+ char __user *data, size_t count,
+ int nonblocking)
+{
+ void *vaddr = CALL(q, vaddr, buf);
+
+ /* copy to userspace */
+ if (count > buf->size - q->read_off)
+ count = buf->size - q->read_off;
+
+ if (copy_to_user(data, vaddr + q->read_off, count))
+ return -EFAULT;
+
+ return count;
+}
+
+static int __videobuf_copy_stream(struct videobuf_queue *q,
+ struct videobuf_buffer *buf,
+ char __user *data, size_t count, size_t pos,
+ int vbihack, int nonblocking)
+{
+ unsigned int *fc = CALL(q, vaddr, buf);
+
+ if (vbihack) {
+ /* dirty, undocumented hack -- pass the frame counter
+ * within the last four bytes of each vbi data block.
+ * We need that one to maintain backward compatibility
+ * to all vbi decoding software out there ... */
+ fc += (buf->size >> 2) - 1;
+ *fc = buf->field_count >> 1;
+ dprintk(1, "vbihack: %d\n", *fc);
+ }
+
+ /* copy stuff using the common method */
+ count = __videobuf_copy_to_user(q, buf, data, count, nonblocking);
+
+ if ((count == -EFAULT) && (pos == 0))
+ return -EFAULT;
+
+ return count;
+}
+
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, nbufs;
+ unsigned long flags = 0;
+ unsigned size = 0, nbufs = 1;
int retval;
- MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
- mutex_lock(&q->lock);
+ mutex_lock(&q->vb_lock);
- nbufs = 1; size = 0;
- q->ops->buf_setup(q,&nbufs,&size);
+ q->ops->buf_setup(q, &nbufs, &size);
if (NULL == q->read_buf &&
count >= size &&
!nonblocking) {
- retval = videobuf_read_zerocopy(q,data,count,ppos);
+ retval = videobuf_read_zerocopy(q, data, count, ppos);
if (retval >= 0 || retval == -EIO)
/* ok, all done */
goto done;
retval = -ENOMEM;
q->read_buf = videobuf_alloc(q);
- dprintk(1,"video alloc=0x%p\n", q->read_buf);
+ 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);
+ retval = q->ops->buf_prepare(q, q->read_buf, field);
if (0 != retval) {
- kfree (q->read_buf);
+ kfree(q->read_buf);
q->read_buf = NULL;
goto done;
}
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(q,q->read_buf);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
+ spin_lock_irqsave(q->irqlock, flags);
+ q->ops->buf_queue(q, q->read_buf);
+ spin_unlock_irqrestore(q->irqlock, flags);
+
q->read_off = 0;
}
if (0 != retval)
goto done;
- CALL(q,sync,q,q->read_buf);
+ CALL(q, sync, q, q->read_buf);
- if (STATE_ERROR == q->read_buf->state) {
+ if (VIDEOBUF_ERROR == q->read_buf->state) {
/* catch I/O errors */
- q->ops->buf_release(q,q->read_buf);
+ q->ops->buf_release(q, q->read_buf);
kfree(q->read_buf);
q->read_buf = NULL;
retval = -EIO;
}
/* Copy to userspace */
- retval=CALL(q,video_copy_to_user,q,data,count,nonblocking);
- if (retval<0)
+ retval = __videobuf_copy_to_user(q, q->read_buf, 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);
+ q->ops->buf_release(q, q->read_buf);
kfree(q->read_buf);
q->read_buf = NULL;
}
- done:
- mutex_unlock(&q->lock);
+done:
+ mutex_unlock(&q->vb_lock);
return retval;
}
+EXPORT_SYMBOL_GPL(videobuf_read_one);
-/* Locking: Caller holds q->lock */
-int videobuf_read_start(struct videobuf_queue *q)
+/* Locking: Caller holds q->vb_lock */
+static int __videobuf_read_start(struct videobuf_queue *q)
{
enum v4l2_field field;
- unsigned long flags=0;
+ unsigned long flags = 0;
unsigned int count = 0, size = 0;
int err, i;
- q->ops->buf_setup(q,&count,&size);
+ q->ops->buf_setup(q, &count, &size);
if (count < 2)
count = 2;
if (count > VIDEO_MAX_FRAME)
for (i = 0; i < count; i++) {
field = videobuf_next_field(q);
- err = q->ops->buf_prepare(q,q->bufs[i],field);
+ err = q->ops->buf_prepare(q, q->bufs[i], field);
if (err)
return err;
list_add_tail(&q->bufs[i]->stream, &q->stream);
}
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
+ spin_lock_irqsave(q->irqlock, flags);
for (i = 0; i < count; i++)
- q->ops->buf_queue(q,q->bufs[i]);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
+ q->ops->buf_queue(q, q->bufs[i]);
+ spin_unlock_irqrestore(q->irqlock, flags);
q->reading = 1;
return 0;
}
{
int i;
-
videobuf_queue_cancel(q);
__videobuf_mmap_free(q);
INIT_LIST_HEAD(&q->stream);
q->bufs[i] = NULL;
}
q->read_buf = NULL;
- q->reading = 0;
-
}
+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;
+}
+EXPORT_SYMBOL_GPL(videobuf_read_start);
+
void videobuf_read_stop(struct videobuf_queue *q)
{
- mutex_lock(&q->lock);
+ mutex_lock(&q->vb_lock);
__videobuf_read_stop(q);
- mutex_unlock(&q->lock);
+ mutex_unlock(&q->vb_lock);
}
+EXPORT_SYMBOL_GPL(videobuf_read_stop);
void videobuf_stop(struct videobuf_queue *q)
{
- mutex_lock(&q->lock);
+ mutex_lock(&q->vb_lock);
if (q->streaming)
__videobuf_streamoff(q);
if (q->reading)
__videobuf_read_stop(q);
- mutex_unlock(&q->lock);
+ mutex_unlock(&q->vb_lock);
}
-
+EXPORT_SYMBOL_GPL(videobuf_stop);
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;
+ unsigned long flags = 0;
- MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
- dprintk(2,"%s\n",__FUNCTION__);
- mutex_lock(&q->lock);
+ 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);
+ retval = __videobuf_read_start(q);
if (retval < 0)
goto done;
}
break;
}
- if (q->read_buf->state == STATE_DONE) {
- rc = CALL (q,copy_stream, q, data + retval, count,
+ if (q->read_buf->state == VIDEOBUF_DONE) {
+ rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count,
retval, vbihack, nonblocking);
if (rc < 0) {
retval = rc;
if (q->read_off == q->read_buf->size) {
list_add_tail(&q->read_buf->stream,
&q->stream);
- if (q->irqlock)
- spin_lock_irqsave(q->irqlock,flags);
- q->ops->buf_queue(q,q->read_buf);
- if (q->irqlock)
- spin_unlock_irqrestore(q->irqlock,flags);
+ 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->lock);
+done:
+ mutex_unlock(&q->vb_lock);
return retval;
}
+EXPORT_SYMBOL_GPL(videobuf_read_stream);
unsigned int videobuf_poll_stream(struct file *file,
struct videobuf_queue *q,
struct videobuf_buffer *buf = NULL;
unsigned int rc = 0;
- mutex_lock(&q->lock);
+ 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);
+ __videobuf_read_start(q);
if (!q->reading) {
rc = POLLERR;
} else if (NULL == q->read_buf) {
if (0 == rc) {
poll_wait(file, &buf->done, wait);
- if (buf->state == STATE_DONE ||
- buf->state == STATE_ERROR)
+ if (buf->state == VIDEOBUF_DONE ||
+ buf->state == VIDEOBUF_ERROR)
rc = POLLIN|POLLRDNORM;
}
- mutex_unlock(&q->lock);
+ mutex_unlock(&q->vb_lock);
return rc;
}
+EXPORT_SYMBOL_GPL(videobuf_poll_stream);
-int videobuf_mmap_mapper(struct videobuf_queue *q,
- struct vm_area_struct *vma)
+int videobuf_mmap_mapper(struct videobuf_queue *q, struct vm_area_struct *vma)
{
int retval;
- MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
- mutex_lock(&q->lock);
- retval=CALL(q,mmap_mapper,q,vma);
- mutex_unlock(&q->lock);
+ mutex_lock(&q->vb_lock);
+ retval = CALL(q, mmap_mapper, q, vma);
+ mutex_unlock(&q->vb_lock);
return retval;
}
+EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
#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;
+ int rc, i;
- MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
+ MAGIC_CHECK(q->int_ops->magic, MAGIC_QTYPE_OPS);
- memset(&req,0,sizeof(req));
+ memset(&req, 0, sizeof(req));
req.type = q->type;
req.count = count;
req.memory = V4L2_MEMORY_MMAP;
- rc = videobuf_reqbufs(q,&req);
+ rc = videobuf_reqbufs(q, &req);
if (rc < 0)
return rc;
mbuf->size = 0;
for (i = 0; i < mbuf->frames; i++) {
mbuf->offsets[i] = q->bufs[i]->boff;
- mbuf->size += q->bufs[i]->bsize;
+ mbuf->size += PAGE_ALIGN(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_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_free);
-EXPORT_SYMBOL_GPL(videobuf_mmap_mapper);
-
-/*
- * Local variables:
- * c-basic-offset: 8
- * End:
- */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff