[linux-2.6-block.git] / drivers / media / video / videobuf-vmalloc.c

/*
 * helper functions for vmalloc video4linux capture buffers
 *
 * The functions expect the hardware being able to scatter gatter
 * (i.e. the buffers are not linear in physical memory, but fragmented
 * into PAGE_SIZE chunks).  They also assume the driver does not need
 * to touch the video data.
 *
 * (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
 *
 * 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/slab.h>
#include <linux/interrupt.h>

#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <asm/page.h>
#include <asm/pgtable.h>

#include <media/videobuf-vmalloc.h>

#define MAGIC_DMABUF   0x17760309
#define MAGIC_VMAL_MEM 0x18221223

#define MAGIC_CHECK(is,should)	if (unlikely((is) != (should))) \
	{ printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }

static int debug;
module_param(debug, int, 0644);

MODULE_DESCRIPTION("helper module to manage video4linux vmalloc buffers");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
MODULE_LICENSE("GPL");

#define dprintk(level, fmt, arg...)	if (debug >= level) \
	printk(KERN_DEBUG "vbuf-vmalloc: " fmt , ## arg)


/***************************************************************************/

static void
videobuf_vm_open(struct vm_area_struct *vma)
{
	struct videobuf_mapping *map = vma->vm_private_data;

	dprintk(2,"vm_open %p [count=%u,vma=%08lx-%08lx]\n",map,
		map->count,vma->vm_start,vma->vm_end);

	map->count++;
}

static void
videobuf_vm_close(struct vm_area_struct *vma)
{
	struct videobuf_mapping *map = vma->vm_private_data;
	struct videobuf_queue *q = map->q;
	int i;

	dprintk(2,"vm_close %p [count=%u,vma=%08lx-%08lx]\n",map,
		map->count,vma->vm_start,vma->vm_end);

	map->count--;
	if (0 == map->count) {
		dprintk(1,"munmap %p q=%p\n",map,q);
		mutex_lock(&q->vb_lock);
		for (i = 0; i < VIDEO_MAX_FRAME; i++) {
			if (NULL == q->bufs[i])
				continue;

			if (q->bufs[i]->map != map)
				continue;

			q->bufs[i]->map   = NULL;
			q->bufs[i]->baddr = 0;
		}
		mutex_unlock(&q->vb_lock);
		kfree(map);
	}
	return;
}

static struct vm_operations_struct videobuf_vm_ops =
{
	.open     = videobuf_vm_open,
	.close    = videobuf_vm_close,
};

/* ---------------------------------------------------------------------
 * vmalloc handlers for the generic methods
 */

/* Allocated area consists on 3 parts:
	struct video_buffer
	struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
	struct videobuf_dma_sg_memory
 */

static void *__videobuf_alloc(size_t size)
{
	struct videobuf_vmalloc_memory *mem;
	struct videobuf_buffer *vb;

	vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);

	mem = vb->priv = ((char *)vb)+size;
	mem->magic=MAGIC_VMAL_MEM;

	dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
		__func__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
		mem,(long)sizeof(*mem));

	return vb;
}

static int __videobuf_iolock (struct videobuf_queue* q,
			      struct videobuf_buffer *vb,
			      struct v4l2_framebuffer *fbuf)
{
	struct videobuf_vmalloc_memory *mem = vb->priv;

	BUG_ON(!mem);

	MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);

	switch (vb->memory) {
	case V4L2_MEMORY_MMAP:
		dprintk(1, "%s memory method MMAP\n", __func__);

		/* All handling should be done by __videobuf_mmap_mapper() */
		if (!mem->vmalloc) {
			printk(KERN_ERR "memory is not alloced/mmapped.\n");
			return -EINVAL;
		}
		break;
	case V4L2_MEMORY_USERPTR:
	{
		int pages = PAGE_ALIGN(vb->size);

		dprintk(1, "%s memory method USERPTR\n", __func__);

#if 1
		if (vb->baddr) {
			printk(KERN_ERR "USERPTR is currently not supported\n");
			return -EINVAL;
		}
#endif

		/* The only USERPTR currently supported is the one needed for
		   read() method.
		 */

		mem->vmalloc = vmalloc_user(pages);
		if (!mem->vmalloc) {
			printk(KERN_ERR "vmalloc (%d pages) failed\n", pages);
			return -ENOMEM;
		}
		dprintk(1, "vmalloc is at addr %p (%d pages)\n",
			mem->vmalloc, pages);

#if 0
		int rc;
		/* Kernel userptr is used also by read() method. In this case,
		   there's no need to remap, since data will be copied to user
		 */
		if (!vb->baddr)
			return 0;

		/* FIXME: to properly support USERPTR, remap should occur.
		   The code bellow won't work, since mem->vma = NULL
		 */
		/* Try to remap memory */
		rc = remap_vmalloc_range(mem->vma, (void *)vb->baddr, 0);
		if (rc < 0) {
			printk(KERN_ERR "mmap: remap failed with error %d. ", rc);
			return -ENOMEM;
		}
#endif

		break;
	}
	case V4L2_MEMORY_OVERLAY:
	default:
		dprintk(1, "%s memory method OVERLAY/unknown\n", __func__);

		/* Currently, doesn't support V4L2_MEMORY_OVERLAY */
		printk(KERN_ERR "Memory method currently unsupported.\n");
		return -EINVAL;
	}

	return 0;
}

static int __videobuf_sync(struct videobuf_queue *q,
			   struct videobuf_buffer *buf)
{
	return 0;
}

static int __videobuf_mmap_free(struct videobuf_queue *q)
{
	unsigned int i;

	dprintk(1, "%s\n", __func__);
	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
		if (q->bufs[i]) {
			if (q->bufs[i]->map)
				return -EBUSY;
		}
	}

	return 0;
}

static int __videobuf_mmap_mapper(struct videobuf_queue *q,
			 struct vm_area_struct *vma)
{
	struct videobuf_vmalloc_memory *mem;
	struct videobuf_mapping *map;
	unsigned int first;
	int retval, pages;
	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;

	dprintk(1, "%s\n", __func__);
	if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
		return -EINVAL;

	/* look for first buffer to map */
	for (first = 0; first < VIDEO_MAX_FRAME; first++) {
		if (NULL == q->bufs[first])
			continue;

		if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
			continue;
		if (q->bufs[first]->boff == offset)
			break;
	}
	if (VIDEO_MAX_FRAME == first) {
		dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
			(vma->vm_pgoff << PAGE_SHIFT));
		return -EINVAL;
	}

	/* create mapping + update buffer list */
	map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
	if (NULL == map)
		return -ENOMEM;

	q->bufs[first]->map = map;
	map->start = vma->vm_start;
	map->end   = vma->vm_end;
	map->q     = q;

	q->bufs[first]->baddr = vma->vm_start;

	mem = q->bufs[first]->priv;
	BUG_ON(!mem);
	MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);

	pages = PAGE_ALIGN(vma->vm_end - vma->vm_start);
	mem->vmalloc = vmalloc_user(pages);
	if (!mem->vmalloc) {
		printk(KERN_ERR "vmalloc (%d pages) failed\n", pages);
		goto error;
	}
	dprintk(1, "vmalloc is at addr %p (%d pages)\n",
		mem->vmalloc, pages);

	/* Try to remap memory */
	retval = remap_vmalloc_range(vma, mem->vmalloc, 0);
	if (retval < 0) {
		printk(KERN_ERR "mmap: remap failed with error %d. ", retval);
		vfree(mem->vmalloc);
		goto error;
	}

	vma->vm_ops          = &videobuf_vm_ops;
	vma->vm_flags       |= VM_DONTEXPAND | VM_RESERVED;
	vma->vm_private_data = map;

	dprintk(1,"mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n",
		map, q, vma->vm_start, vma->vm_end,
		(long int) q->bufs[first]->bsize,
		vma->vm_pgoff, first);

	videobuf_vm_open(vma);

	return 0;

error:
	mem = NULL;
	kfree(map);
	return -ENOMEM;
}

static int __videobuf_copy_to_user ( struct videobuf_queue *q,
				char __user *data, size_t count,
				int nonblocking )
{
	struct videobuf_vmalloc_memory *mem=q->read_buf->priv;
	BUG_ON (!mem);
	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);

	BUG_ON (!mem->vmalloc);

	/* copy to userspace */
	if (count > q->read_buf->size - q->read_off)
		count = q->read_buf->size - q->read_off;

	if (copy_to_user(data, mem->vmalloc+q->read_off, count))
		return -EFAULT;

	return count;
}

static int __videobuf_copy_stream ( struct videobuf_queue *q,
				char __user *data, size_t count, size_t pos,
				int vbihack, int nonblocking )
{
	unsigned int  *fc;
	struct videobuf_vmalloc_memory *mem=q->read_buf->priv;
	BUG_ON (!mem);
	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);

	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  = (unsigned int*)mem->vmalloc;
		fc += (q->read_buf->size>>2) -1;
		*fc = q->read_buf->field_count >> 1;
		dprintk(1,"vbihack: %d\n",*fc);
	}

	/* copy stuff using the common method */
	count = __videobuf_copy_to_user (q,data,count,nonblocking);

	if ( (count==-EFAULT) && (0 == pos) )
		return -EFAULT;

	return count;
}

static struct videobuf_qtype_ops qops = {
	.magic        = MAGIC_QTYPE_OPS,

	.alloc        = __videobuf_alloc,
	.iolock       = __videobuf_iolock,
	.sync         = __videobuf_sync,
	.mmap_free    = __videobuf_mmap_free,
	.mmap_mapper  = __videobuf_mmap_mapper,
	.video_copy_to_user = __videobuf_copy_to_user,
	.copy_stream  = __videobuf_copy_stream,
};

void videobuf_queue_vmalloc_init(struct videobuf_queue* q,
			 struct videobuf_queue_ops *ops,
			 void *dev,
			 spinlock_t *irqlock,
			 enum v4l2_buf_type type,
			 enum v4l2_field field,
			 unsigned int msize,
			 void *priv)
{
	videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
				 priv, &qops);
}

EXPORT_SYMBOL_GPL(videobuf_queue_vmalloc_init);

void *videobuf_to_vmalloc (struct videobuf_buffer *buf)
{
	struct videobuf_vmalloc_memory *mem=buf->priv;
	BUG_ON (!mem);
	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);

	return mem->vmalloc;
}
EXPORT_SYMBOL_GPL(videobuf_to_vmalloc);

void videobuf_vmalloc_free (struct videobuf_buffer *buf)
{
	struct videobuf_vmalloc_memory *mem = buf->priv;

	if (!mem)
		return;

	MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);

	vfree(mem->vmalloc);
	mem->vmalloc = NULL;


	/* FIXME: need to do buf->priv = NULL? */

	return;
}
EXPORT_SYMBOL_GPL(videobuf_vmalloc_free);

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */
Commit	Line	Data
87b9ad07 MCC	1	/*
	2	* helper functions for vmalloc video4linux capture buffers
	3	*
	4	* The functions expect the hardware being able to scatter gatter
	5	* (i.e. the buffers are not linear in physical memory, but fragmented
	6	* into PAGE_SIZE chunks). They also assume the driver does not need
	7	* to touch the video data.
	8	*
	9	* (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
	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 <linux/pci.h>
	23	#include <linux/vmalloc.h>
	24	#include <linux/pagemap.h>
	25	#include <asm/page.h>
	26	#include <asm/pgtable.h>
	27
	28	#include <media/videobuf-vmalloc.h>
	29
	30	#define MAGIC_DMABUF 0x17760309
	31	#define MAGIC_VMAL_MEM 0x18221223
	32
	33	#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
	34	{ printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
	35
ff699e6b	36	static int debug;
87b9ad07 MCC	37	module_param(debug, int, 0644);
	38
	39	MODULE_DESCRIPTION("helper module to manage video4linux vmalloc buffers");
	40	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
	41	MODULE_LICENSE("GPL");
	42
	43	#define dprintk(level, fmt, arg...) if (debug >= level) \
493977f0	44	printk(KERN_DEBUG "vbuf-vmalloc: " fmt , ## arg)
87b9ad07 MCC	45
	46
	47	/***************************************************************************/
	48
	49	static void
	50	videobuf_vm_open(struct vm_area_struct *vma)
	51	{
	52	struct videobuf_mapping *map = vma->vm_private_data;
	53
0b29669c	54	dprintk(2,"vm_open %p [count=%u,vma=%08lx-%08lx]\n",map,
87b9ad07 MCC	55	map->count,vma->vm_start,vma->vm_end);
	56
	57	map->count++;
	58	}
	59
	60	static void
	61	videobuf_vm_close(struct vm_area_struct *vma)
	62	{
	63	struct videobuf_mapping *map = vma->vm_private_data;
	64	struct videobuf_queue *q = map->q;
87b9ad07 MCC	65	int i;
87b9ad07 MCC	66
0b29669c	67	dprintk(2,"vm_close %p [count=%u,vma=%08lx-%08lx]\n",map,
87b9ad07 MCC	68	map->count,vma->vm_start,vma->vm_end);
	69
	70	map->count--;
	71	if (0 == map->count) {
	72	dprintk(1,"munmap %p q=%p\n",map,q);
64f9477f	73	mutex_lock(&q->vb_lock);
87b9ad07 MCC	74	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
	75	if (NULL == q->bufs[i])
	76	continue;
87b9ad07	77
851c0c96	78	if (q->bufs[i]->map != map)
87b9ad07	79	continue;
123f8ef6	80
851c0c96	81	q->bufs[i]->map = NULL;
87b9ad07	82	q->bufs[i]->baddr = 0;
87b9ad07	83	}
64f9477f	84	mutex_unlock(&q->vb_lock);
87b9ad07 MCC	85	kfree(map);
	86	}
	87	return;
	88	}
	89
	90	static struct vm_operations_struct videobuf_vm_ops =
	91	{
	92	.open = videobuf_vm_open,
	93	.close = videobuf_vm_close,
	94	};
	95
	96	/* ---------------------------------------------------------------------
	97	* vmalloc handlers for the generic methods
	98	*/
	99
	100	/* Allocated area consists on 3 parts:
	101	struct video_buffer
	102	struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
0705135e	103	struct videobuf_dma_sg_memory
87b9ad07 MCC	104	*/
	105
	106	static void *__videobuf_alloc(size_t size)
	107	{
384b835a	108	struct videobuf_vmalloc_memory *mem;
87b9ad07 MCC	109	struct videobuf_buffer *vb;
	110
	111	vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
	112
	113	mem = vb->priv = ((char *)vb)+size;
	114	mem->magic=MAGIC_VMAL_MEM;
	115
	116	dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
7e28adb2	117	__func__,vb,(long)sizeof(vb),(long)size-sizeof(vb),
87b9ad07 MCC	118	mem,(long)sizeof(*mem));
	119
	120	return vb;
	121	}
	122
	123	static int __videobuf_iolock (struct videobuf_queue* q,
	124	struct videobuf_buffer *vb,
	125	struct v4l2_framebuffer *fbuf)
	126	{
968ced78	127	struct videobuf_vmalloc_memory *mem = vb->priv;
87b9ad07 MCC	128
	129	BUG_ON(!mem);
	130
968ced78	131	MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
87b9ad07	132
968ced78 MCC	133	switch (vb->memory) {
	134	case V4L2_MEMORY_MMAP:
	135	dprintk(1, "%s memory method MMAP\n", __func__);
87b9ad07	136
968ced78 MCC	137	/* All handling should be done by __videobuf_mmap_mapper() */
	138	if (!mem->vmalloc) {
	139	printk(KERN_ERR "memory is not alloced/mmapped.\n");
	140	return -EINVAL;
	141	}
	142	break;
	143	case V4L2_MEMORY_USERPTR:
	144	{
	145	int pages = PAGE_ALIGN(vb->size);
87b9ad07	146
968ced78 MCC	147	dprintk(1, "%s memory method USERPTR\n", __func__);
	148
	149	#if 1
	150	if (vb->baddr) {
	151	printk(KERN_ERR "USERPTR is currently not supported\n");
	152	return -EINVAL;
	153	}
	154	#endif
87b9ad07	155
968ced78 MCC	156	/* The only USERPTR currently supported is the one needed for
	157	read() method.
	158	*/
	159
	160	mem->vmalloc = vmalloc_user(pages);
	161	if (!mem->vmalloc) {
	162	printk(KERN_ERR "vmalloc (%d pages) failed\n", pages);
	163	return -ENOMEM;
87b9ad07	164	}
968ced78 MCC	165	dprintk(1, "vmalloc is at addr %p (%d pages)\n",
	166	mem->vmalloc, pages);
	167
	168	#if 0
	169	int rc;
	170	/* Kernel userptr is used also by read() method. In this case,
	171	there's no need to remap, since data will be copied to user
	172	*/
	173	if (!vb->baddr)
	174	return 0;
	175
	176	/* FIXME: to properly support USERPTR, remap should occur.
	177	The code bellow won't work, since mem->vma = NULL
	178	*/
	179	/* Try to remap memory */
	180	rc = remap_vmalloc_range(mem->vma, (void *)vb->baddr, 0);
	181	if (rc < 0) {
	182	printk(KERN_ERR "mmap: remap failed with error %d. ", rc);
	183	return -ENOMEM;
	184	}
	185	#endif
	186
	187	break;
	188	}
	189	case V4L2_MEMORY_OVERLAY:
	190	default:
	191	dprintk(1, "%s memory method OVERLAY/unknown\n", __func__);
	192
	193	/* Currently, doesn't support V4L2_MEMORY_OVERLAY */
	194	printk(KERN_ERR "Memory method currently unsupported.\n");
	195	return -EINVAL;
87b9ad07 MCC	196	}
	197
	198	return 0;
	199	}
	200
	201	static int __videobuf_sync(struct videobuf_queue *q,
	202	struct videobuf_buffer *buf)
	203	{
	204	return 0;
	205	}
	206
	207	static int __videobuf_mmap_free(struct videobuf_queue *q)
	208	{
	209	unsigned int i;
	210
968ced78	211	dprintk(1, "%s\n", __func__);
87b9ad07 MCC	212	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
87b9ad07 MCC	213	if (q->bufs[i]) {
851c0c96	214	if (q->bufs[i]->map)
87b9ad07 MCC	215	return -EBUSY;
	216	}
	217	}
	218
	219	return 0;
	220	}
	221
	222	static int __videobuf_mmap_mapper(struct videobuf_queue *q,
	223	struct vm_area_struct *vma)
	224	{
384b835a	225	struct videobuf_vmalloc_memory *mem;
87b9ad07 MCC	226	struct videobuf_mapping *map;
87b9ad07 MCC	227	unsigned int first;
968ced78	228	int retval, pages;
87b9ad07 MCC	229	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
87b9ad07 MCC	230
968ced78 MCC	231	dprintk(1, "%s\n", __func__);
968ced78 MCC	232	if (!(vma->vm_flags & VM_WRITE) \|\| !(vma->vm_flags & VM_SHARED))
87b9ad07 MCC	233	return -EINVAL;
	234
	235	/* look for first buffer to map */
	236	for (first = 0; first < VIDEO_MAX_FRAME; first++) {
	237	if (NULL == q->bufs[first])
	238	continue;
	239
	240	if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
	241	continue;
	242	if (q->bufs[first]->boff == offset)
	243	break;
	244	}
	245	if (VIDEO_MAX_FRAME == first) {
	246	dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
	247	(vma->vm_pgoff << PAGE_SHIFT));
	248	return -EINVAL;
	249	}
87b9ad07 MCC	250
87b9ad07 MCC	251	/* create mapping + update buffer list */
968ced78	252	map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
87b9ad07 MCC	253	if (NULL == map)
	254	return -ENOMEM;
	255
968ced78	256	q->bufs[first]->map = map;
87b9ad07 MCC	257	map->start = vma->vm_start;
	258	map->end = vma->vm_end;
	259	map->q = q;
	260
	261	q->bufs[first]->baddr = vma->vm_start;
	262
968ced78 MCC	263	mem = q->bufs[first]->priv;
	264	BUG_ON(!mem);
	265	MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
87b9ad07	266
968ced78 MCC	267	pages = PAGE_ALIGN(vma->vm_end - vma->vm_start);
	268	mem->vmalloc = vmalloc_user(pages);
	269	if (!mem->vmalloc) {
	270	printk(KERN_ERR "vmalloc (%d pages) failed\n", pages);
	271	goto error;
	272	}
	273	dprintk(1, "vmalloc is at addr %p (%d pages)\n",
	274	mem->vmalloc, pages);
851c0c96	275
87b9ad07	276	/* Try to remap memory */
968ced78 MCC	277	retval = remap_vmalloc_range(vma, mem->vmalloc, 0);
	278	if (retval < 0) {
	279	printk(KERN_ERR "mmap: remap failed with error %d. ", retval);
	280	vfree(mem->vmalloc);
	281	goto error;
87b9ad07 MCC	282	}
87b9ad07 MCC	283
968ced78 MCC	284	vma->vm_ops = &videobuf_vm_ops;
	285	vma->vm_flags \|= VM_DONTEXPAND \| VM_RESERVED;
	286	vma->vm_private_data = map;
	287
87b9ad07	288	dprintk(1,"mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n",
968ced78	289	map, q, vma->vm_start, vma->vm_end,
87b9ad07	290	(long int) q->bufs[first]->bsize,
968ced78	291	vma->vm_pgoff, first);
87b9ad07 MCC	292
	293	videobuf_vm_open(vma);
	294
968ced78 MCC	295	return 0;
	296
	297	error:
	298	mem = NULL;
	299	kfree(map);
	300	return -ENOMEM;
87b9ad07 MCC	301	}
87b9ad07 MCC	302
87b9ad07 MCC	303	static int __videobuf_copy_to_user ( struct videobuf_queue *q,
	304	char __user *data, size_t count,
	305	int nonblocking )
	306	{
384b835a	307	struct videobuf_vmalloc_memory *mem=q->read_buf->priv;
87b9ad07 MCC	308	BUG_ON (!mem);
	309	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
	310
	311	BUG_ON (!mem->vmalloc);
	312
	313	/* copy to userspace */
	314	if (count > q->read_buf->size - q->read_off)
	315	count = q->read_buf->size - q->read_off;
	316
	317	if (copy_to_user(data, mem->vmalloc+q->read_off, count))
	318	return -EFAULT;
	319
	320	return count;
	321	}
	322
	323	static int __videobuf_copy_stream ( struct videobuf_queue *q,
	324	char __user *data, size_t count, size_t pos,
	325	int vbihack, int nonblocking )
	326	{
	327	unsigned int *fc;
384b835a	328	struct videobuf_vmalloc_memory *mem=q->read_buf->priv;
87b9ad07 MCC	329	BUG_ON (!mem);
	330	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
	331
	332	if (vbihack) {
	333	/* dirty, undocumented hack -- pass the frame counter
	334	* within the last four bytes of each vbi data block.
	335	* We need that one to maintain backward compatibility
	336	* to all vbi decoding software out there ... */
	337	fc = (unsigned int*)mem->vmalloc;
	338	fc += (q->read_buf->size>>2) -1;
	339	*fc = q->read_buf->field_count >> 1;
	340	dprintk(1,"vbihack: %d\n",*fc);
	341	}
	342
	343	/* copy stuff using the common method */
	344	count = __videobuf_copy_to_user (q,data,count,nonblocking);
	345
	346	if ( (count==-EFAULT) && (0 == pos) )
	347	return -EFAULT;
	348
	349	return count;
	350	}
	351
	352	static struct videobuf_qtype_ops qops = {
	353	.magic = MAGIC_QTYPE_OPS,
	354
	355	.alloc = __videobuf_alloc,
	356	.iolock = __videobuf_iolock,
	357	.sync = __videobuf_sync,
	358	.mmap_free = __videobuf_mmap_free,
	359	.mmap_mapper = __videobuf_mmap_mapper,
13bcd5d0	360	.video_copy_to_user = __videobuf_copy_to_user,
87b9ad07 MCC	361	.copy_stream = __videobuf_copy_stream,
	362	};
	363
	364	void videobuf_queue_vmalloc_init(struct videobuf_queue* q,
	365	struct videobuf_queue_ops *ops,
	366	void *dev,
	367	spinlock_t *irqlock,
	368	enum v4l2_buf_type type,
	369	enum v4l2_field field,
	370	unsigned int msize,
	371	void *priv)
	372	{
d4cae5a5 MCC	373	videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
d4cae5a5 MCC	374	priv, &qops);
87b9ad07 MCC	375	}
	376
	377	EXPORT_SYMBOL_GPL(videobuf_queue_vmalloc_init);
	378
	379	void videobuf_to_vmalloc (struct videobuf_buffer buf)
	380	{
384b835a	381	struct videobuf_vmalloc_memory *mem=buf->priv;
87b9ad07 MCC	382	BUG_ON (!mem);
	383	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
	384
	385	return mem->vmalloc;
	386	}
	387	EXPORT_SYMBOL_GPL(videobuf_to_vmalloc);
	388
	389	void videobuf_vmalloc_free (struct videobuf_buffer *buf)
	390	{
968ced78	391	struct videobuf_vmalloc_memory *mem = buf->priv;
87b9ad07	392
968ced78 MCC	393	if (!mem)
	394	return;
	395
	396	MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
87b9ad07 MCC	397
87b9ad07 MCC	398	vfree(mem->vmalloc);
968ced78 MCC	399	mem->vmalloc = NULL;
	400
	401
	402
	403	/* FIXME: need to do buf->priv = NULL? */
87b9ad07 MCC	404
	405	return;
	406	}
	407	EXPORT_SYMBOL_GPL(videobuf_vmalloc_free);
	408
	409	/*
	410	* Local variables:
	411	* c-basic-offset: 8
	412	* End:
	413	*/