path: root/drivers/media/video/saa7134/saa7134-oss.c

/*
 *
 * device driver for philips saa7134 based TV cards
 * oss dsp interface
 *
 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
 *
 *  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 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/soundcard.h>

#include "saa7134-reg.h"
#include "saa7134.h"

/* ------------------------------------------------------------------ */

static unsigned int oss_debug  = 0;
module_param(oss_debug, int, 0644);
MODULE_PARM_DESC(oss_debug,"enable debug messages [oss]");

static unsigned int oss_rate  = 0;
module_param(oss_rate, int, 0444);
MODULE_PARM_DESC(oss_rate,"sample rate (valid are: 32000,48000)");

#define dprintk(fmt, arg...)	if (oss_debug) \
	printk(KERN_DEBUG "%s/oss: " fmt, dev->name , ## arg)


/* ------------------------------------------------------------------ */

static int dsp_buffer_conf(struct saa7134_dev *dev, int blksize, int blocks)
{
	if (blksize < 0x100)
		blksize = 0x100;
	if (blksize > 0x10000)
		blksize = 0x10000;

	if (blocks < 2)
		blocks = 2;
	if ((blksize * blocks) > 1024*1024)
		blocks = 1024*1024 / blksize;

	dev->oss.blocks  = blocks;
	dev->oss.blksize = blksize;
	dev->oss.bufsize = blksize * blocks;

	dprintk("buffer config: %d blocks / %d bytes, %d kB total\n",
 		blocks,blksize,blksize * blocks / 1024);
	return 0;
}

static int dsp_buffer_init(struct saa7134_dev *dev)
{
	int err;

	if (!dev->oss.bufsize)
		BUG();
	videobuf_dma_init(&dev->oss.dma);
	err = videobuf_dma_init_kernel(&dev->oss.dma, PCI_DMA_FROMDEVICE,
				       (dev->oss.bufsize + PAGE_SIZE) >> PAGE_SHIFT);
	if (0 != err)
		return err;
	return 0;
}

static int dsp_buffer_free(struct saa7134_dev *dev)
{
	if (!dev->oss.blksize)
		BUG();
	videobuf_dma_free(&dev->oss.dma);
	dev->oss.blocks  = 0;
	dev->oss.blksize = 0;
	dev->oss.bufsize = 0;
	return 0;
}

static void dsp_dma_start(struct saa7134_dev *dev)
{
	dev->oss.dma_blk     = 0;
	dev->oss.dma_running = 1;
	saa7134_set_dmabits(dev);
}

static void dsp_dma_stop(struct saa7134_dev *dev)
{
	dev->oss.dma_blk     = -1;
	dev->oss.dma_running = 0;
	saa7134_set_dmabits(dev);
}

static int dsp_rec_start(struct saa7134_dev *dev)
{
	int err, bswap, sign;
	u32 fmt, control;
	unsigned long flags;

	/* prepare buffer */
	if (0 != (err = videobuf_dma_pci_map(dev->pci,&dev->oss.dma)))
		return err;
	if (0 != (err = saa7134_pgtable_alloc(dev->pci,&dev->oss.pt)))
		goto fail1;
	if (0 != (err = saa7134_pgtable_build(dev->pci,&dev->oss.pt,
					      dev->oss.dma.sglist,
					      dev->oss.dma.sglen,
					      0)))
		goto fail2;

	/* sample format */
	switch (dev->oss.afmt) {
	case AFMT_U8:
	case AFMT_S8:     fmt = 0x00;  break;
	case AFMT_U16_LE:
	case AFMT_U16_BE:
	case AFMT_S16_LE:
	case AFMT_S16_BE: fmt = 0x01;  break;
	default:
		err = -EINVAL;
		goto fail2;
	}

	switch (dev->oss.afmt) {
	case AFMT_S8:
	case AFMT_S16_LE:
	case AFMT_S16_BE: sign = 1; break;
	default:          sign = 0; break;
	}

	switch (dev->oss.afmt) {
	case AFMT_U16_BE:
	case AFMT_S16_BE: bswap = 1; break;
	default:          bswap = 0; break;
	}

	switch (dev->pci->device) {
	case PCI_DEVICE_ID_PHILIPS_SAA7134:
		if (1 == dev->oss.channels)
			fmt |= (1 << 3);
		if (2 == dev->oss.channels)
			fmt |= (3 << 3);
		if (sign)
			fmt |= 0x04;
		fmt |= (TV == dev->oss.input) ? 0xc0 : 0x80;

		saa_writeb(SAA7134_NUM_SAMPLES0, ((dev->oss.blksize - 1) & <