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[media] saa7134: drop abuse of low-level videobuf functions

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saa7134-alsa used low-level videobuf functions to allocate and sync
DMA buffers. Replace this with saa7134-specific code. These functions
will not be available when we convert to vb2.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Hans Verkuil 2014-04-17 03:57:14 -03:00 committed by Mauro Carvalho Chehab
parent e72936d235
commit 15e64f0dde
2 changed files with 89 additions and 11 deletions
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93
drivers/media/pci/saa7134/saa7134-alsa.c
View File

@ -274,6 +274,82 @@ static int snd_card_saa7134_capture_trigger(struct snd_pcm_substream * substream
return err;
}
static int saa7134_alsa_dma_init(struct saa7134_dev *dev, int nr_pages)
{
struct saa7134_dmasound *dma = &dev->dmasound;
struct page *pg;
int i;
dma->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
if (NULL == dma->vaddr) {
dprintk("vmalloc_32(%d pages) failed\n", nr_pages);
return -ENOMEM;
}
dprintk("vmalloc is at addr 0x%08lx, size=%d\n",
(unsigned long)dma->vaddr,
nr_pages << PAGE_SHIFT);
memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT);
dma->nr_pages = nr_pages;
dma->sglist = vzalloc(dma->nr_pages * sizeof(*dma->sglist));
if (NULL == dma->sglist)
goto vzalloc_err;
sg_init_table(dma->sglist, dma->nr_pages);
for (i = 0; i < dma->nr_pages; i++) {
pg = vmalloc_to_page(dma->vaddr + i * PAGE_SIZE);
if (NULL == pg)
goto vmalloc_to_page_err;
sg_set_page(&dma->sglist[i], pg, PAGE_SIZE, 0);
}
return 0;
vmalloc_to_page_err:
vfree(dma->sglist);
dma->sglist = NULL;
vzalloc_err:
vfree(dma->vaddr);
dma->vaddr = NULL;
return -ENOMEM;
}
static int saa7134_alsa_dma_map(struct saa7134_dev *dev)
{
struct saa7134_dmasound *dma = &dev->dmasound;
dma->sglen = dma_map_sg(&dev->pci->dev, dma->sglist,
dma->nr_pages, PCI_DMA_FROMDEVICE);
if (0 == dma->sglen) {
pr_warn("%s: saa7134_alsa_map_sg failed\n", __func__);
return -ENOMEM;
}
return 0;
}
static int saa7134_alsa_dma_unmap(struct saa7134_dev *dev)
{
struct saa7134_dmasound *dma = &dev->dmasound;
if (!dma->sglen)
return 0;
dma_unmap_sg(&dev->pci->dev, dma->sglist, dma->sglen, PCI_DMA_FROMDEVICE);
dma->sglen = 0;
return 0;
}
static int saa7134_alsa_dma_free(struct saa7134_dmasound *dma)
{
vfree(dma->sglist);
dma->sglist = NULL;
vfree(dma->vaddr);
dma->vaddr = NULL;
return 0;
}
/*
* DMA buffer initialization
*
@ -291,8 +367,7 @@ static int dsp_buffer_init(struct saa7134_dev *dev)
BUG_ON(!dev->dmasound.bufsize);
videobuf_dma_init(&dev->dmasound.dma);
err = videobuf_dma_init_kernel(&dev->dmasound.dma, PCI_DMA_FROMDEVICE,
err = saa7134_alsa_dma_init(dev,
(dev->dmasound.bufsize + PAGE_SIZE) >> PAGE_SHIFT);
if (0 != err)
return err;
@ -310,7 +385,7 @@ static int dsp_buffer_free(struct saa7134_dev *dev)
{
BUG_ON(!dev->dmasound.blksize);
videobuf_dma_free(&dev->dmasound.dma);
saa7134_alsa_dma_free(&dev->dmasound);
dev->dmasound.blocks = 0;
dev->dmasound.blksize = 0;
@ -632,7 +707,7 @@ static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream,
/* release the old buffer */
if (substream->runtime->dma_area) {
saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
videobuf_dma_unmap(&dev->pci->dev, &dev->dmasound.dma);
saa7134_alsa_dma_unmap(dev);
dsp_buffer_free(dev);
substream->runtime->dma_area = NULL;
}
@ -648,14 +723,14 @@ static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream,
return err;
}
err = videobuf_dma_map(&dev->pci->dev, &dev->dmasound.dma);
err = saa7134_alsa_dma_map(dev);
if (err) {
dsp_buffer_free(dev);
return err;
}
err = saa7134_pgtable_alloc(dev->pci, &dev->dmasound.pt);
if (err) {
videobuf_dma_unmap(&dev->pci->dev, &dev->dmasound.dma);
saa7134_alsa_dma_unmap(dev);
dsp_buffer_free(dev);
return err;
}
@ -663,7 +738,7 @@ static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream,
dev->dmasound.sglist, dev->dmasound.sglen, 0);
if (err) {
saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
videobuf_dma_unmap(&dev->pci->dev, &dev->dmasound.dma);
saa7134_alsa_dma_unmap(dev);
dsp_buffer_free(dev);
return err;
}
@ -672,7 +747,7 @@ static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream,
byte, but it doesn't work. So I allocate the DMA using the
V4L functions, and force ALSA to use that as the DMA area */
substream->runtime->dma_area = dev->dmasound.dma.vaddr;
substream->runtime->dma_area = dev->dmasound.vaddr;
substream->runtime->dma_bytes = dev->dmasound.bufsize;
substream->runtime->dma_addr = 0;
@ -699,7 +774,7 @@ static int snd_card_saa7134_hw_free(struct snd_pcm_substream * substream)
if (substream->runtime->dma_area) {
saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
videobuf_dma_unmap(&dev->pci->dev, &dev->dmasound.dma);
saa7134_alsa_dma_unmap(dev);
dsp_buffer_free(dev);
substream->runtime->dma_area = NULL;
}

5
drivers/media/pci/saa7134/saa7134.h
View File

@ -504,7 +504,10 @@ struct saa7134_dmasound {
unsigned int blksize;
unsigned int bufsize;
struct saa7134_pgtable pt;
struct videobuf_dmabuf dma;
void *vaddr;
struct scatterlist *sglist;
int sglen;
int nr_pages;
unsigned int dma_blk;
unsigned int read_offset;
unsigned int read_count;