#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <media/saa7146_vv.h>
#include <media/v4l2-event.h>
#include <media/v4l2-ctrls.h>
#include <linux/module.h>
static int max_memory = 32;
module_param(max_memory, int, 0644);
MODULE_PARM_DESC(max_memory, "maximum memory usage for capture buffers (default: 32Mb)");
#define IS_CAPTURE_ACTIVE(fh) \
(((vv->video_status & STATUS_CAPTURE) != 0) && (vv->video_fh == fh))
#define IS_OVERLAY_ACTIVE(fh) \
(((vv->video_status & STATUS_OVERLAY) != 0) && (vv->video_fh == fh))
/* format descriptions for capture and preview */
static struct saa7146_format formats[] = {
{
.name = "RGB-8 (3-3-2)",
.pixelformat = V4L2_PIX_FMT_RGB332,
.trans = RGB08_COMPOSED,
.depth = 8,
.flags = 0,
}, {
.name = "RGB-16 (5/B-6/G-5/R)",
.pixelformat = V4L2_PIX_FMT_RGB565,
.trans = RGB16_COMPOSED,
.depth = 16,
.flags = 0,
}, {
.name = "RGB-24 (B-G-R)",
.pixelformat = V4L2_PIX_FMT_BGR24,
.trans = RGB24_COMPOSED,
.depth = 24,
.flags = 0,
}, {
.name = "RGB-32 (B-G-R)",
.pixelformat = V4L2_PIX_FMT_BGR32,
.trans = RGB32_COMPOSED,
.depth = 32,
.flags = 0,
}, {
.name = "RGB-32 (R-G-B)",
.pixelformat = V4L2_PIX_FMT_RGB32,
.trans = RGB32_COMPOSED,
.depth = 32,
.flags = 0,
.swap = 0x2,
}, {
.name = "Greyscale-8",
.pixelformat = V4L2_PIX_FMT_GREY,
.trans = Y8,
.depth = 8,
.flags = 0,
}, {
.name = "YUV 4:2:2 planar (Y-Cb-Cr)",
.pixelformat = V4L2_PIX_FMT_YUV422P,
.trans = YUV422_DECOMPOSED,
.depth = 16,
.flags = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
}, {
.name = "YVU 4:2:0 planar (Y-Cb-Cr)",
.pixelformat = V4L2_PIX_FMT_YVU420,
.trans = YUV420_DECOMPOSED,
.depth = 12,
.flags = FORMAT_BYTE_SWAP|FORMAT_IS_PLANAR,
}, {
.name = "YUV 4:2:0 planar (Y-Cb-Cr)",
.pixelformat = V4L2_PIX_FMT_YUV420,
.trans = YUV420_DECOMPOSED,
.depth = 12,
.flags = FORMAT_IS_PLANAR,
}, {
.name = "YUV 4:2:2 (U-Y-V-Y)",
.pixelformat = V4L2_PIX_FMT_UYVY,
.trans = YUV422_COMPOSED,
.depth = 16,
.flags = 0,
}
};
/* unfortunately, the saa7146 contains a bug which prevents it from doing on-the-fly byte swaps.
due to this, it's impossible to provide additional *packed* formats, which are simply byte swapped
(like V4L2_PIX_FMT_YUYV) ... 8-( */
static int NUM_FORMATS = sizeof(formats)/sizeof(struct saa7146_format);
struct saa7146_format* saa7146_format_by_fourcc(struct saa7146_dev *dev, int fourcc)
{
int i, j = NUM_FORMATS;
for (i = 0; i < j; i++) {
if (formats[i].pixelformat == fourcc) {
return formats+i;
}
}
DEB_D("unknown pixelformat:'%4.4s'\n", (char *)&fourcc);
return NULL;
}
static int vidioc_try_fmt_vid_overlay(struct file *file, void *fh, struct v4l2_format *f);
int saa7146_start_preview(struct saa7146_fh *fh)
{
struct saa7146_dev *dev = fh->dev;
struct saa7146_vv *vv = dev->vv_data;
struct v4l2_format fmt;
int ret = 0, err = 0;
DEB_EE("dev:%p, fh:%p\n", dev, fh);
/* check if we have overlay information */
if (vv->ov.fh == NULL) {
DEB_D("no overlay data available. try S_FMT first.\n");
return -EAGAIN;
}
/* check if streaming capture is running */
if (IS_CAPTURE_ACTIVE(fh) != 0) {
DEB_D("streaming capture is active\n");
return -EBUSY;
}
/* check if overlay is running */
if (IS_OVERLAY_ACTIVE(fh) != 0) {
if (vv->video_fh == fh) {
DEB_D("overlay is already active\n");
return 0;
}
DEB_D("overlay is already active in another open\n");
return -EBUSY;
}
if (0 == saa7146_res_get(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP)) {
DEB_D("cannot get necessary overlay resources\n");
return -EBUSY;
}
fmt.fmt.win = vv->ov.win;
err = vidioc_try_fmt_vid_overlay(NULL, fh, &fmt);
if (0 != err) {
saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
return -EBUSY;
}
vv->ov.win = fmt.fmt.win;
DEB_D("%dx%d+%d+%d %s field=%s\n",
vv->ov.win.w.width, vv->ov.win.w.height,
vv->ov.win.w.left, vv->ov.win.w.top,
vv->ov_fmt->name, v4l2_field_names[vv->ov.win.field]);
if (0 != (ret = saa7146_enable_overlay(fh))) {
DEB_D("enabling overlay failed: %d\n", ret);
saa7146_res_free(vv->video_fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
return ret;
}
vv->video_status = STATUS_OVERLAY;
vv->video_fh = fh;
return 0;
}
EXPORT_SYMBOL_GPL(saa7146_start_preview);
int saa7146_stop_preview(struct saa7146_fh *fh)
{
struct saa7146_dev *dev = fh->dev;
struct saa7146_vv *vv = dev->vv_data;
DEB_EE("dev:%p, fh:%p\n", dev, fh);
/* check if streaming capture is running */
if (IS_CAPTURE_ACTIVE(fh) != 0) {
DEB_D("streaming capture is active\n");
return -EBUSY;
}
/* check if overlay is running at all */
if ((vv->video_status & STATUS_OVERLAY) == 0) {
DEB_D("no active overlay\n");
return 0;
}
if (vv->video_fh != fh) {
DEB_D("overlay is active, but in another open\n");
return -EBUSY;
}
vv->video_status = 0;
vv->video_fh = NULL;
saa7146_disable_overlay(fh);
saa7146_res_free(fh, RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP);
return 0;
}
EXPORT_SYMBOL_GPL(saa7146_stop_preview);
/********************************************************************************/
/* common pagetable functions */
static int saa7146_pgtable_build(struct saa7146_dev *dev, struct saa7146_buf *buf)
{
struct pci_dev *pci = dev->pci;
struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
struct scatterlist *list = dma->sglist;
int length = dma->sglen;
struct saa7146_format *sfmt = saa7146_format_by_fourcc(dev,buf->fmt->pixelformat);
DEB_EE("dev:%p, buf:%p, sg_len:%d\n", dev, buf, length);
if( 0 != IS_PLANAR(sfmt->trans)) {
struct saa7146_pgtable *pt1 = &buf->pt[0];
struct saa7146_pgtable *pt2 = &buf->pt[1];
struct saa7146_pgtable *pt3 = &buf->pt[2];
__le32 *ptr1, *ptr2, *ptr3;
__le32 fill;
int size = buf->fmt->width*buf->fmt->height;
int i,p,m1,m2,m3,o1,o2;
switch( sfmt->depth ) {
case 12: {
/* create some offsets inside the page table */
m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
m2 = ((size+(size/4)+PAGE_SIZE)/PAGE_SIZE)-1;
m3 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
o1 = size%PAGE_SIZE;
o2 = (size+(size/4))%PAGE_SIZE;
DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
size, m1, m2, m3, o1, o2);
break;
}
case 16: {
/* create some offsets inside the page table */
m1 = ((size+PAGE_SIZE)/PAGE_SIZE)-1;
m2 = ((size+(size/2)+PAGE_SIZE)/PAGE_SIZE)-1;
m3 = ((2*size+PAGE_SIZE)/PAGE_SIZE)-1;
o1 = size%PAGE_SIZE;
o2 = (size+(size/2))%PAGE_SIZE;
DEB_CAP("size:%d, m1:%d, m2:%d, m3:%d, o1:%d, o2:%d\n",
size, m1, m2, m3, o1, o2);
break;
}
default: {
return -1;
}
}
ptr1 = pt1->cpu;
ptr2 = pt2->cpu;
ptr3 = pt3->cpu;
/* walk all pages, copy all page addresses to ptr1 */
for (i = 0; i < length; i++, list++) {
for (p = 0; p * 4096 < list->length; p++, ptr1++) {
*ptr1 = cpu_to_le32(sg_dma_address(list) - list->offset);
}
}
/*
ptr1 = pt1->cpu;
for(j=0;j<40;j++) {
printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
}
*/
/* if we have a user buffer, the first page may not be
aligned to a page boundary. */
pt1->offset = dma->sglist->offset;
pt2->offset = pt1->offset+o1;
pt3->offset = pt1->offset+o2;
/* create video-dma2 page table */
ptr1 = pt1->cpu;
for(i = m1; i <= m2 ; i++, ptr2++) {
*ptr2 = ptr1[i];
}
fill = *(ptr2-1);
for(;i<1024;i++,ptr2++) {
*ptr2 = fill;
}
/* create video-dma3 page table */
ptr1 = pt1->cpu;
for(i = m2; i <= m3; i++,ptr3++) {
*ptr3 = ptr1[i];
}
fill = *(ptr3-1);
for(;i<1024;i++,ptr3++) {
*ptr3 = fill;
}
/* finally: finish up video-dma1 page table */
ptr1 = pt1->cpu+m1;
fill = pt1->cpu[m1];
for(i=m1;i<1024;i++,ptr1++) {
*ptr1 = fill;
}
/*
ptr1 = pt1->cpu;
ptr2 = pt2->cpu;
ptr3 = pt3->cpu;
for(j=0;j<40;j++) {
printk("ptr1 %d: 0x%08x\n",j,ptr1[j]);
}
for(j=0;j<40;j++) {
printk("ptr2 %d: 0x%08x\n",j,ptr2[j]);
}
for(j=0;j<40;j++) {
