[mirror_ubuntu-jammy-kernel.git] / drivers / media / pci / saa7164 / saa7164-buffer.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Driver for the NXP SAA7164 PCIe bridge
 *
 *  Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com>
 */

#include <linux/slab.h>

#include "saa7164.h"

/* The PCI address space for buffer handling looks like this:
 *
 * +-u32 wide-------------+
 * |                      +
 * +-u64 wide------------------------------------+
 * +                                             +
 * +----------------------+
 * | CurrentBufferPtr     + Pointer to current PCI buffer >-+
 * +----------------------+                                 |
 * | Unused               +                                 |
 * +----------------------+                                 |
 * | Pitch                + = 188 (bytes)                   |
 * +----------------------+                                 |
 * | PCI buffer size      + = pitch * number of lines (312) |
 * +----------------------+                                 |
 * |0| Buf0 Write Offset  +                                 |
 * +----------------------+                                 v
 * |1| Buf1 Write Offset  +                                 |
 * +----------------------+                                 |
 * |2| Buf2 Write Offset  +                                 |
 * +----------------------+                                 |
 * |3| Buf3 Write Offset  +                                 |
 * +----------------------+                                 |
 * ... More write offsets                                   |
 * +---------------------------------------------+          |
 * +0| set of ptrs to PCI pagetables             +          |
 * +---------------------------------------------+          |
 * +1| set of ptrs to PCI pagetables             + <--------+
 * +---------------------------------------------+
 * +2| set of ptrs to PCI pagetables             +
 * +---------------------------------------------+
 * +3| set of ptrs to PCI pagetables             + >--+
 * +---------------------------------------------+    |
 * ... More buffer pointers                           |  +----------------+
 *						    +->| pt[0] TS data  |
 *						    |  +----------------+
 *						    |
 *						    |  +----------------+
 *						    +->| pt[1] TS data  |
 *						    |  +----------------+
 *						    | etc
 */

void saa7164_buffer_display(struct saa7164_buffer *buf)
{
	struct saa7164_dev *dev = buf->port->dev;
	int i;

	dprintk(DBGLVL_BUF, "%s()   buffer @ 0x%p nr=%d\n",
		__func__, buf, buf->idx);
	dprintk(DBGLVL_BUF, "  pci_cpu @ 0x%p    dma @ 0x%08llx len = 0x%x\n",
		buf->cpu, (long long)buf->dma, buf->pci_size);
	dprintk(DBGLVL_BUF, "   pt_cpu @ 0x%p pt_dma @ 0x%08llx len = 0x%x\n",
		buf->pt_cpu, (long long)buf->pt_dma, buf->pt_size);

	/* Format the Page Table Entries to point into the data buffer */
	for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {

		dprintk(DBGLVL_BUF, "    pt[%02d] = 0x%p -> 0x%llx\n",
			i, buf->pt_cpu, (u64)*(buf->pt_cpu));

	}
}
/* Allocate a new buffer structure and associated PCI space in bytes.
 * len must be a multiple of sizeof(u64)
 */
struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_port *port,
	u32 len)
{
	struct tmHWStreamParameters *params = &port->hw_streamingparams;
	struct saa7164_buffer *buf = NULL;
	struct saa7164_dev *dev = port->dev;
	int i;

	if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) {
		log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__);
		goto ret;
	}

	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
	if (!buf)
		goto ret;

	buf->idx = -1;
	buf->port = port;
	buf->flags = SAA7164_BUFFER_FREE;
	buf->pos = 0;
	buf->actual_size = params->pitch * params->numberoflines;
	buf->crc = 0;
	/* TODO: arg len is being ignored */
	buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
	buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;

	/* Allocate contiguous memory */
	buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
		&buf->dma);
	if (!buf->cpu)
		goto fail1;

	buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
		&buf->pt_dma);
	if (!buf->pt_cpu)
		goto fail2;

	/* init the buffers to a known pattern, easier during debugging */
	memset(buf->cpu, 0xff, buf->pci_size);
	buf->crc = crc32(0, buf->cpu, buf->actual_size);
	memset(buf->pt_cpu, 0xff, buf->pt_size);

	dprintk(DBGLVL_BUF, "%s()   allocated buffer @ 0x%p (%d pageptrs)\n",
		__func__, buf, params->numpagetables);
	dprintk(DBGLVL_BUF, "  pci_cpu @ 0x%p    dma @ 0x%08lx len = 0x%x\n",
		buf->cpu, (long)buf->dma, buf->pci_size);
	dprintk(DBGLVL_BUF, "   pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
		buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);

	/* Format the Page Table Entries to point into the data buffer */
	for (i = 0 ; i < params->numpagetables; i++) {

		*(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
		dprintk(DBGLVL_BUF, "    pt[%02d] = 0x%p -> 0x%llx\n",
			i, buf->pt_cpu, (u64)*(buf->pt_cpu));

	}

	goto ret;

fail2:
	pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
fail1:
	kfree(buf);

	buf = NULL;
ret:
	return buf;
}

int saa7164_buffer_dealloc(struct saa7164_buffer *buf)
{
	struct saa7164_dev *dev;

	if (!buf || !buf->port)
		return SAA_ERR_BAD_PARAMETER;
	dev = buf->port->dev;

	dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n",
		__func__, buf);

	if (buf->flags != SAA7164_BUFFER_FREE)
		log_warn(" freeing a non-free buffer\n");

	pci_free_consistent(dev->pci, buf->pci_size, buf->cpu, buf->dma);
	pci_free_consistent(dev->pci, buf->pt_size, buf->pt_cpu, buf->pt_dma);

	kfree(buf);

	return SAA_OK;
}

int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i)
{
	struct saa7164_dev *dev = port->dev;

	if ((i < 0) || (i >= port->hwcfg.buffercount))
		return -EINVAL;

	dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);

	saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);

	return 0;
}

/* Write a buffer into the hardware */
int saa7164_buffer_activate(struct saa7164_buffer *buf, int i)
{
	struct saa7164_port *port = buf->port;
	struct saa7164_dev *dev = port->dev;

	if ((i < 0) || (i >= port->hwcfg.buffercount))
		return -EINVAL;

	dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);

	buf->idx = i; /* Note of which buffer list index position we occupy */
	buf->flags = SAA7164_BUFFER_BUSY;
	buf->pos = 0;

	/* TODO: Review this in light of 32v64 assignments */
	saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
	saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma);
	saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0);

	dprintk(DBGLVL_BUF, "	buf[%d] offset 0x%llx (0x%x) buf 0x%llx/%llx (0x%x/%x) nr=%d\n",
		buf->idx,
		(u64)port->bufoffset + (i * sizeof(u32)),
		saa7164_readl(port->bufoffset + (sizeof(u32) * i)),
		(u64)port->bufptr32h + ((sizeof(u32) * 2) * i),
		(u64)port->bufptr32l + ((sizeof(u32) * 2) * i),
		saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)),
		saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)),
		buf->idx);

	return 0;
}

int saa7164_buffer_cfg_port(struct saa7164_port *port)
{
	struct tmHWStreamParameters *params = &port->hw_streamingparams;
	struct saa7164_dev *dev = port->dev;
	struct saa7164_buffer *buf;
	struct list_head *c, *n;
	int i = 0;

	dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr);

	saa7164_writel(port->bufcounter, 0);
	saa7164_writel(port->pitch, params->pitch);
	saa7164_writel(port->bufsize, params->pitch * params->numberoflines);

	dprintk(DBGLVL_BUF, " configured:\n");
	dprintk(DBGLVL_BUF, "   lmmio       0x%p\n", dev->lmmio);
	dprintk(DBGLVL_BUF, "   bufcounter  0x%x = 0x%x\n", port->bufcounter,
		saa7164_readl(port->bufcounter));

	dprintk(DBGLVL_BUF, "   pitch       0x%x = %d\n", port->pitch,
		saa7164_readl(port->pitch));

	dprintk(DBGLVL_BUF, "   bufsize     0x%x = %d\n", port->bufsize,
		saa7164_readl(port->bufsize));

	dprintk(DBGLVL_BUF, "   buffercount = %d\n", port->hwcfg.buffercount);
	dprintk(DBGLVL_BUF, "   bufoffset = 0x%x\n", port->bufoffset);
	dprintk(DBGLVL_BUF, "   bufptr32h = 0x%x\n", port->bufptr32h);
	dprintk(DBGLVL_BUF, "   bufptr32l = 0x%x\n", port->bufptr32l);

	/* Poke the buffers and offsets into PCI space */
	mutex_lock(&port->dmaqueue_lock);
	list_for_each_safe(c, n, &port->dmaqueue.list) {
		buf = list_entry(c, struct saa7164_buffer, list);

		if (buf->flags != SAA7164_BUFFER_FREE)
			BUG();

		/* Place the buffer in the h/w queue */
		saa7164_buffer_activate(buf, i);

		/* Don't exceed the device maximum # bufs */
		if (i++ > port->hwcfg.buffercount)
			BUG();

	}
	mutex_unlock(&port->dmaqueue_lock);

	return 0;
}

struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev,
	u32 len)
{
	struct saa7164_user_buffer *buf;

	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->data = kzalloc(len, GFP_KERNEL);

	if (!buf->data) {
		kfree(buf);
		return NULL;
	}

	buf->actual_size = len;
	buf->pos = 0;
	buf->crc = 0;

	dprintk(DBGLVL_BUF, "%s()   allocated user buffer @ 0x%p\n",
		__func__, buf);

	return buf;
}

void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf)
{
	if (!buf)
		return;

	kfree(buf->data);
	buf->data = NULL;

	kfree(buf);
}
Commit	Line	Data
c942fddf	1	// SPDX-License-Identifier: GPL-2.0-or-later
443c1228 ST	2	/*
	3	* Driver for the NXP SAA7164 PCIe bridge
	4	*
63a412ec	5	* Copyright (c) 2010-2015 Steven Toth <stoth@kernellabs.com>
443c1228 ST	6	*/
443c1228 ST	7
5a0e3ad6 TH	8	#include <linux/slab.h>
5a0e3ad6 TH	9
443c1228 ST	10	#include "saa7164.h"
	11
	12	/* The PCI address space for buffer handling looks like this:
bc250684 ST	13	*
	14	* +-u32 wide-------------+
	15	* \| +
	16	* +-u64 wide------------------------------------+
	17	* + +
	18	* +----------------------+
	19	* \| CurrentBufferPtr + Pointer to current PCI buffer >-+
	20	* +----------------------+ \|
	21	* \| Unused + \|
	22	* +----------------------+ \|
	23	* \| Pitch + = 188 (bytes) \|
	24	* +----------------------+ \|
	25	* \| PCI buffer size + = pitch * number of lines (312) \|
	26	* +----------------------+ \|
	27	* \|0\| Buf0 Write Offset + \|
	28	* +----------------------+ v
	29	* \|1\| Buf1 Write Offset + \|
	30	* +----------------------+ \|
	31	* \|2\| Buf2 Write Offset + \|
	32	* +----------------------+ \|
	33	* \|3\| Buf3 Write Offset + \|
	34	* +----------------------+ \|
	35	* ... More write offsets \|
	36	* +---------------------------------------------+ \|
	37	* +0\| set of ptrs to PCI pagetables + \|
	38	* +---------------------------------------------+ \|
	39	* +1\| set of ptrs to PCI pagetables + <--------+
	40	* +---------------------------------------------+
	41	* +2\| set of ptrs to PCI pagetables +
	42	* +---------------------------------------------+
	43	* +3\| set of ptrs to PCI pagetables + >--+
	44	* +---------------------------------------------+ \|
	45	* ... More buffer pointers \| +----------------+
	46	* +->\| pt[0] TS data \|
	47	* \| +----------------+
	48	* \|
	49	* \| +----------------+
	50	* +->\| pt[1] TS data \|
	51	* \| +----------------+
	52	* \| etc
443c1228 ST	53	*/
443c1228 ST	54
add3f580 ST	55	void saa7164_buffer_display(struct saa7164_buffer *buf)
	56	{
	57	struct saa7164_dev *dev = buf->port->dev;
	58	int i;
	59
	60	dprintk(DBGLVL_BUF, "%s() buffer @ 0x%p nr=%d\n",
	61	__func__, buf, buf->idx);
5cecdc81 MCC	62	dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08llx len = 0x%x\n",
	63	buf->cpu, (long long)buf->dma, buf->pci_size);
	64	dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08llx len = 0x%x\n",
	65	buf->pt_cpu, (long long)buf->pt_dma, buf->pt_size);
add3f580 ST	66
	67	/* Format the Page Table Entries to point into the data buffer */
	68	for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
	69
	70	dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
	71	i, buf->pt_cpu, (u64)*(buf->pt_cpu));
	72
	73	}
	74	}
443c1228 ST	75	/* Allocate a new buffer structure and associated PCI space in bytes.
	76	* len must be a multiple of sizeof(u64)
	77	*/
add3f580	78	struct saa7164_buffer saa7164_buffer_alloc(struct saa7164_port port,
443c1228 ST	79	u32 len)
443c1228 ST	80	{
4d270cfb	81	struct tmHWStreamParameters *params = &port->hw_streamingparams;
61ca1500	82	struct saa7164_buffer *buf = NULL;
443c1228 ST	83	struct saa7164_dev *dev = port->dev;
	84	int i;
	85
	86	if ((len == 0) \|\| (len >= 65536) \|\| (len % sizeof(u64))) {
	87	log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__);
	88	goto ret;
	89	}
	90
2d3da59f	91	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
c38e8657	92	if (!buf)
443c1228	93	goto ret;
443c1228	94
add3f580	95	buf->idx = -1;
443c1228 ST	96	buf->port = port;
443c1228 ST	97	buf->flags = SAA7164_BUFFER_FREE;
add3f580 ST	98	buf->pos = 0;
add3f580 ST	99	buf->actual_size = params->pitch * params->numberoflines;
12d3203e	100	buf->crc = 0;
443c1228 ST	101	/* TODO: arg len is being ignored */
	102	buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
	103	buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;
	104
	105	/* Allocate contiguous memory */
	106	buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
	107	&buf->dma);
	108	if (!buf->cpu)
	109	goto fail1;
	110
	111	buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
	112	&buf->pt_dma);
	113	if (!buf->pt_cpu)
	114	goto fail2;
	115
	116	/* init the buffers to a known pattern, easier during debugging */
065e1477	117	memset(buf->cpu, 0xff, buf->pci_size);
12d3203e	118	buf->crc = crc32(0, buf->cpu, buf->actual_size);
065e1477	119	memset(buf->pt_cpu, 0xff, buf->pt_size);
443c1228	120
1b0e8e46 ST	121	dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p (%d pageptrs)\n",
1b0e8e46 ST	122	__func__, buf, params->numpagetables);
ab205857 MCC	123	dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08lx len = 0x%x\n",
	124	buf->cpu, (long)buf->dma, buf->pci_size);
	125	dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
	126	buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);
443c1228 ST	127
443c1228 ST	128	/* Format the Page Table Entries to point into the data buffer */
1b0e8e46	129	for (i = 0 ; i < params->numpagetables; i++) {
443c1228 ST	130
443c1228 ST	131	(buf->pt_cpu + i) = buf->dma + (i 0x1000); /* TODO */
1b0e8e46 ST	132	dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
1b0e8e46 ST	133	i, buf->pt_cpu, (u64)*(buf->pt_cpu));
443c1228	134
443c1228 ST	135	}
	136
	137	goto ret;
	138
	139	fail2:
	140	pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
	141	fail1:
	142	kfree(buf);
	143
61ca1500	144	buf = NULL;
443c1228 ST	145	ret:
	146	return buf;
	147	}
	148
add3f580	149	int saa7164_buffer_dealloc(struct saa7164_buffer *buf)
443c1228	150	{
23e64d55	151	struct saa7164_dev *dev;
443c1228	152
add3f580	153	if (!buf \|\| !buf->port)
443c1228	154	return SAA_ERR_BAD_PARAMETER;
add3f580	155	dev = buf->port->dev;
443c1228	156
add3f580 ST	157	dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n",
add3f580 ST	158	__func__, buf);
443c1228 ST	159
	160	if (buf->flags != SAA7164_BUFFER_FREE)
	161	log_warn(" freeing a non-free buffer\n");
	162
add3f580 ST	163	pci_free_consistent(dev->pci, buf->pci_size, buf->cpu, buf->dma);
add3f580 ST	164	pci_free_consistent(dev->pci, buf->pt_size, buf->pt_cpu, buf->pt_dma);
443c1228 ST	165
	166	kfree(buf);
	167
	168	return SAA_OK;
	169	}
	170
9230acaa ST	171	int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i)
	172	{
	173	struct saa7164_dev *dev = port->dev;
	174
	175	if ((i < 0) \|\| (i >= port->hwcfg.buffercount))
	176	return -EINVAL;
	177
	178	dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
	179
	180	saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
	181
	182	return 0;
	183	}
	184
add3f580 ST	185	/* Write a buffer into the hardware */
	186	int saa7164_buffer_activate(struct saa7164_buffer *buf, int i)
	187	{
	188	struct saa7164_port *port = buf->port;
	189	struct saa7164_dev *dev = port->dev;
	190
	191	if ((i < 0) \|\| (i >= port->hwcfg.buffercount))
	192	return -EINVAL;
	193
	194	dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
	195
	196	buf->idx = i; /* Note of which buffer list index position we occupy */
	197	buf->flags = SAA7164_BUFFER_BUSY;
	198	buf->pos = 0;
	199
	200	/* TODO: Review this in light of 32v64 assignments */
	201	saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
	202	saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma);
	203	saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0);
	204
24f711c1	205	dprintk(DBGLVL_BUF, " buf[%d] offset 0x%llx (0x%x) buf 0x%llx/%llx (0x%x/%x) nr=%d\n",
add3f580 ST	206	buf->idx,
	207	(u64)port->bufoffset + (i * sizeof(u32)),
	208	saa7164_readl(port->bufoffset + (sizeof(u32) * i)),
	209	(u64)port->bufptr32h + ((sizeof(u32) * 2) * i),
	210	(u64)port->bufptr32l + ((sizeof(u32) * 2) * i),
	211	saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)),
	212	saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)),
	213	buf->idx);
	214
	215	return 0;
	216	}
	217
	218	int saa7164_buffer_cfg_port(struct saa7164_port *port)
	219	{
4d270cfb	220	struct tmHWStreamParameters *params = &port->hw_streamingparams;
add3f580 ST	221	struct saa7164_dev *dev = port->dev;
	222	struct saa7164_buffer *buf;
	223	struct list_head c, n;
	224	int i = 0;
	225
	226	dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr);
	227
	228	saa7164_writel(port->bufcounter, 0);
	229	saa7164_writel(port->pitch, params->pitch);
	230	saa7164_writel(port->bufsize, params->pitch * params->numberoflines);
	231
	232	dprintk(DBGLVL_BUF, " configured:\n");
	233	dprintk(DBGLVL_BUF, " lmmio 0x%p\n", dev->lmmio);
	234	dprintk(DBGLVL_BUF, " bufcounter 0x%x = 0x%x\n", port->bufcounter,
	235	saa7164_readl(port->bufcounter));
	236
	237	dprintk(DBGLVL_BUF, " pitch 0x%x = %d\n", port->pitch,
	238	saa7164_readl(port->pitch));
	239
	240	dprintk(DBGLVL_BUF, " bufsize 0x%x = %d\n", port->bufsize,
	241	saa7164_readl(port->bufsize));
	242
	243	dprintk(DBGLVL_BUF, " buffercount = %d\n", port->hwcfg.buffercount);
	244	dprintk(DBGLVL_BUF, " bufoffset = 0x%x\n", port->bufoffset);
	245	dprintk(DBGLVL_BUF, " bufptr32h = 0x%x\n", port->bufptr32h);
	246	dprintk(DBGLVL_BUF, " bufptr32l = 0x%x\n", port->bufptr32l);
	247
	248	/* Poke the buffers and offsets into PCI space */
	249	mutex_lock(&port->dmaqueue_lock);
	250	list_for_each_safe(c, n, &port->dmaqueue.list) {
	251	buf = list_entry(c, struct saa7164_buffer, list);
	252
	253	if (buf->flags != SAA7164_BUFFER_FREE)
	254	BUG();
	255
	256	/* Place the buffer in the h/w queue */
	257	saa7164_buffer_activate(buf, i);
	258
	259	/* Don't exceed the device maximum # bufs */
	260	if (i++ > port->hwcfg.buffercount)
	261	BUG();
	262
	263	}
	264	mutex_unlock(&port->dmaqueue_lock);
	265
	266	return 0;
	267	}
	268
bc250684 ST	269	struct saa7164_user_buffer saa7164_buffer_alloc_user(struct saa7164_dev dev,
bc250684 ST	270	u32 len)
7615e434 ST	271	{
	272	struct saa7164_user_buffer *buf;
	273
2d3da59f	274	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
61ca1500 PH	275	if (!buf)
61ca1500 PH	276	return NULL;
7615e434 ST	277
	278	buf->data = kzalloc(len, GFP_KERNEL);
	279
61ca1500	280	if (!buf->data) {
7615e434	281	kfree(buf);
61ca1500	282	return NULL;
7615e434 ST	283	}
	284
	285	buf->actual_size = len;
	286	buf->pos = 0;
12d3203e	287	buf->crc = 0;
7615e434 ST	288
	289	dprintk(DBGLVL_BUF, "%s() allocated user buffer @ 0x%p\n",
	290	__func__, buf);
	291
	292	return buf;
	293	}
	294
	295	void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf)
	296	{
	297	if (!buf)
	298	return;
	299
bc250684	300	kfree(buf->data);
61ca1500	301	buf->data = NULL;
7615e434	302
bc250684	303	kfree(buf);
7615e434 ST	304	}
7615e434 ST	305