als4000.c

linux 内核源代码

	.period_bytes_min =	64,
	.period_bytes_max =	65536,
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		0
};

static struct snd_pcm_hardware snd_als4000_capture =
{
	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
				 SNDRV_PCM_INFO_MMAP_VALID),
	.formats =		SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_U8 |
				SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_U16_LE,	/* formats */
	.rates =		SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
	.rate_min =		4000,
	.rate_max =		48000,
	.channels_min =		1,
	.channels_max =		2,
	.buffer_bytes_max =	65536,
	.period_bytes_min =	64,
	.period_bytes_max =	65536,
	.periods_min =		1,
	.periods_max =		1024,
	.fifo_size =		0
};

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

static int snd_als4000_playback_open(struct snd_pcm_substream *substream)
{
	struct snd_sb *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;

	chip->playback_substream = substream;
	runtime->hw = snd_als4000_playback;
	return 0;
}

static int snd_als4000_playback_close(struct snd_pcm_substream *substream)
{
	struct snd_sb *chip = snd_pcm_substream_chip(substream);

	chip->playback_substream = NULL;
	snd_pcm_lib_free_pages(substream);
	return 0;
}

static int snd_als4000_capture_open(struct snd_pcm_substream *substream)
{
	struct snd_sb *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;

	chip->capture_substream = substream;
	runtime->hw = snd_als4000_capture;
	return 0;
}

static int snd_als4000_capture_close(struct snd_pcm_substream *substream)
{
	struct snd_sb *chip = snd_pcm_substream_chip(substream);

	chip->capture_substream = NULL;
	snd_pcm_lib_free_pages(substream);
	return 0;
}

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

static struct snd_pcm_ops snd_als4000_playback_ops = {
	.open =		snd_als4000_playback_open,
	.close =	snd_als4000_playback_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_als4000_hw_params,
	.hw_free =	snd_als4000_hw_free,
	.prepare =	snd_als4000_playback_prepare,
	.trigger =	snd_als4000_playback_trigger,
	.pointer =	snd_als4000_playback_pointer
};

static struct snd_pcm_ops snd_als4000_capture_ops = {
	.open =		snd_als4000_capture_open,
	.close =	snd_als4000_capture_close,
	.ioctl =	snd_pcm_lib_ioctl,
	.hw_params =	snd_als4000_hw_params,
	.hw_free =	snd_als4000_hw_free,
	.prepare =	snd_als4000_capture_prepare,
	.trigger =	snd_als4000_capture_trigger,
	.pointer =	snd_als4000_capture_pointer
};

static int __devinit snd_als4000_pcm(struct snd_sb *chip, int device)
{
	struct snd_pcm *pcm;
	int err;

	if ((err = snd_pcm_new(chip->card, "ALS4000 DSP", device, 1, 1, &pcm)) < 0)
		return err;
	pcm->private_data = chip;
	pcm->info_flags = SNDRV_PCM_INFO_JOINT_DUPLEX;
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_als4000_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_als4000_capture_ops);

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
					      64*1024, 64*1024);

	chip->pcm = pcm;

	return 0;
}

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

static void snd_als4000_set_addr(unsigned long gcr,
					unsigned int sb,
					unsigned int mpu,
					unsigned int opl,
					unsigned int game)
{
	u32 confA = 0;
	u32 confB = 0;

	if (mpu > 0)
		confB |= (mpu | 1) << 16;
	if (sb > 0)
		confB |= (sb | 1);
	if (game > 0)
		confA |= (game | 1) << 16;
	if (opl > 0)	
		confA |= (opl | 1);
	snd_als4000_gcr_write_addr(gcr, 0xa8, confA);
	snd_als4000_gcr_write_addr(gcr, 0xa9, confB);
}

static void snd_als4000_configure(struct snd_sb *chip)
{
	unsigned tmp;
	int i;

	/* do some more configuration */
	spin_lock_irq(&chip->mixer_lock);
	tmp = snd_sbmixer_read(chip, 0xc0);
	snd_sbmixer_write(chip, 0xc0, tmp|0x80);
	/* always select DMA channel 0, since we do not actually use DMA */
	snd_sbmixer_write(chip, SB_DSP4_DMASETUP, SB_DMASETUP_DMA0);
	snd_sbmixer_write(chip, 0xc0, tmp&0x7f);
	spin_unlock_irq(&chip->mixer_lock);
	
	spin_lock_irq(&chip->reg_lock);
	/* magic number. Enables interrupts(?) */
	snd_als4000_gcr_write(chip, 0x8c, 0x28000);
	for(i = 0x91; i <= 0x96; ++i)
		snd_als4000_gcr_write(chip, i, 0);
	
	snd_als4000_gcr_write(chip, 0x99, snd_als4000_gcr_read(chip, 0x99));
	spin_unlock_irq(&chip->reg_lock);
}

#ifdef SUPPORT_JOYSTICK
static int __devinit snd_als4000_create_gameport(struct snd_card_als4000 *acard, int dev)
{
	struct gameport *gp;
	struct resource *r;
	int io_port;

	if (joystick_port[dev] == 0)
		return -ENODEV;

	if (joystick_port[dev] == 1) { /* auto-detect */
		for (io_port = 0x200; io_port <= 0x218; io_port += 8) {
			r = request_region(io_port, 8, "ALS4000 gameport");
			if (r)
				break;
		}
	} else {
		io_port = joystick_port[dev];
		r = request_region(io_port, 8, "ALS4000 gameport");
	}

	if (!r) {
		printk(KERN_WARNING "als4000: cannot reserve joystick ports\n");
		return -EBUSY;
	}

	acard->gameport = gp = gameport_allocate_port();
	if (!gp) {
		printk(KERN_ERR "als4000: cannot allocate memory for gameport\n");
		release_and_free_resource(r);
		return -ENOMEM;
	}

	gameport_set_name(gp, "ALS4000 Gameport");
	gameport_set_phys(gp, "pci%s/gameport0", pci_name(acard->pci));
	gameport_set_dev_parent(gp, &acard->pci->dev);
	gp->io = io_port;
	gameport_set_port_data(gp, r);

	/* Enable legacy joystick port */
	snd_als4000_set_addr(acard->gcr, 0, 0, 0, 1);

	gameport_register_port(acard->gameport);

	return 0;
}

static void snd_als4000_free_gameport(struct snd_card_als4000 *acard)
{
	if (acard->gameport) {
		struct resource *r = gameport_get_port_data(acard->gameport);

		gameport_unregister_port(acard->gameport);
		acard->gameport = NULL;

		snd_als4000_set_addr(acard->gcr, 0, 0, 0, 0); /* disable joystick */
		release_and_free_resource(r);
	}
}
#else
static inline int snd_als4000_create_gameport(struct snd_card_als4000 *acard, int dev) { return -ENOSYS; }
static inline void snd_als4000_free_gameport(struct snd_card_als4000 *acard) { }
#endif

static void snd_card_als4000_free( struct snd_card *card )
{
	struct snd_card_als4000 * acard = (struct snd_card_als4000 *)card->private_data;

	/* make sure that interrupts are disabled */
	snd_als4000_gcr_write_addr( acard->gcr, 0x8c, 0);
	/* free resources */
	snd_als4000_free_gameport(acard);
	pci_release_regions(acard->pci);
	pci_disable_device(acard->pci);
}

static int __devinit snd_card_als4000_probe(struct pci_dev *pci,
					  const struct pci_device_id *pci_id)
{
	static int dev;
	struct snd_card *card;
	struct snd_card_als4000 *acard;
	unsigned long gcr;
	struct snd_sb *chip;
	struct snd_opl3 *opl3;
	unsigned short word;
	int err;

	if (dev >= SNDRV_CARDS)
		return -ENODEV;
	if (!enable[dev]) {
		dev++;
		return -ENOENT;
	}

	/* enable PCI device */
	if ((err = pci_enable_device(pci)) < 0) {
		return err;
	}
	/* check, if we can restrict PCI DMA transfers to 24 bits */
	if (pci_set_dma_mask(pci, DMA_24BIT_MASK) < 0 ||
	    pci_set_consistent_dma_mask(pci, DMA_24BIT_MASK) < 0) {
		snd_printk(KERN_ERR "architecture does not support 24bit PCI busmaster DMA\n");
		pci_disable_device(pci);
		return -ENXIO;
	}

	if ((err = pci_request_regions(pci, "ALS4000")) < 0) {
		pci_disable_device(pci);
		return err;
	}
	gcr = pci_resource_start(pci, 0);

	pci_read_config_word(pci, PCI_COMMAND, &word);
	pci_write_config_word(pci, PCI_COMMAND, word | PCI_COMMAND_IO);
	pci_set_master(pci);
	
	card = snd_card_new(index[dev], id[dev], THIS_MODULE, 
			    sizeof( struct snd_card_als4000 ) );
	if (card == NULL) {
		pci_release_regions(pci);
		pci_disable_device(pci);
		return -ENOMEM;
	}

	acard = (struct snd_card_als4000 *)card->private_data;
	acard->pci = pci;
	acard->gcr = gcr;
	card->private_free = snd_card_als4000_free;

	/* disable all legacy ISA stuff */
	snd_als4000_set_addr(acard->gcr, 0, 0, 0, 0);

	if ((err = snd_sbdsp_create(card,
				    gcr + 0x10,
				    pci->irq,
				    snd_als4000_interrupt,
				    -1,
				    -1,
				    SB_HW_ALS4000,
				    &chip)) < 0) {
		goto out_err;
	}
	acard->chip = chip;

	chip->pci = pci;
	chip->alt_port = gcr;
	snd_card_set_dev(card, &pci->dev);

	snd_als4000_configure(chip);

	strcpy(card->driver, "ALS4000");
	strcpy(card->shortname, "Avance Logic ALS4000");
	sprintf(card->longname, "%s at 0x%lx, irq %i",
		card->shortname, chip->alt_port, chip->irq);

	if ((err = snd_mpu401_uart_new( card, 0, MPU401_HW_ALS4000,
				        gcr+0x30, MPU401_INFO_INTEGRATED,
					pci->irq, 0, &chip->rmidi)) < 0) {
		printk(KERN_ERR "als4000: no MPU-401 device at 0x%lx?\n", gcr+0x30);
		goto out_err;
	}

	if ((err = snd_als4000_pcm(chip, 0)) < 0) {
		goto out_err;
	}
	if ((err = snd_sbmixer_new(chip)) < 0) {
		goto out_err;
	}	    

	if (snd_opl3_create(card, gcr+0x10, gcr+0x12,
			    OPL3_HW_AUTO, 1, &opl3) < 0) {
		printk(KERN_ERR "als4000: no OPL device at 0x%lx-0x%lx?\n",
			   gcr+0x10, gcr+0x12 );
	} else {
		if ((err = snd_opl3_hwdep_new(opl3, 0, 1, NULL)) < 0) {
			goto out_err;
		}
	}

	snd_als4000_create_gameport(acard, dev);

	if ((err = snd_card_register(card)) < 0) {
		goto out_err;
	}
	pci_set_drvdata(pci, card);
	dev++;
	err = 0;
	goto out;

out_err:
	snd_card_free(card);
	
out:
	return err;
}

static void __devexit snd_card_als4000_remove(struct pci_dev *pci)
{
	snd_card_free(pci_get_drvdata(pci));
	pci_set_drvdata(pci, NULL);
}

#ifdef CONFIG_PM
static int snd_als4000_suspend(struct pci_dev *pci, pm_message_t state)
{
	struct snd_card *card = pci_get_drvdata(pci);
	struct snd_card_als4000 *acard = card->private_data;
	struct snd_sb *chip = acard->chip;

	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
	
	snd_pcm_suspend_all(chip->pcm);
	snd_sbmixer_suspend(chip);

	pci_disable_device(pci);
	pci_save_state(pci);
	pci_set_power_state(pci, pci_choose_state(pci, state));
	return 0;
}

static int snd_als4000_resume(struct pci_dev *pci)
{
	struct snd_card *card = pci_get_drvdata(pci);
	struct snd_card_als4000 *acard = card->private_data;
	struct snd_sb *chip = acard->chip;

	pci_set_power_state(pci, PCI_D0);
	pci_restore_state(pci);
	if (pci_enable_device(pci) < 0) {
		printk(KERN_ERR "als4000: pci_enable_device failed, "
		       "disabling device\n");
		snd_card_disconnect(card);
		return -EIO;
	}
	pci_set_master(pci);

	snd_als4000_configure(chip);
	snd_sbdsp_reset(chip);
	snd_sbmixer_resume(chip);

#ifdef SUPPORT_JOYSTICK
	if (acard->gameport)
		snd_als4000_set_addr(acard->gcr, 0, 0, 0, 1);
#endif

	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
	return 0;
}
#endif


static struct pci_driver driver = {
	.name = "ALS4000",
	.id_table = snd_als4000_ids,
	.probe = snd_card_als4000_probe,
	.remove = __devexit_p(snd_card_als4000_remove),
#ifdef CONFIG_PM
	.suspend = snd_als4000_suspend,
	.resume = snd_als4000_resume,
#endif
};

static int __init alsa_card_als4000_init(void)
{
	return pci_register_driver(&driver);
}

static void __exit alsa_card_als4000_exit(void)
{
	pci_unregister_driver(&driver);
}

module_init(alsa_card_als4000_init)
module_exit(alsa_card_als4000_exit)