hda_intel.c

一个Linux下的软猫驱动

	/* create modem PCMs */
	pcm_dev = AZX_MAX_AUDIO_PCMS;
	list_for_each(p, &chip->bus->codec_list) {
		codec = list_entry(p, struct hda_codec, list);
		for (c = 0; c < codec->num_pcms; c++) {
			if (! codec->pcm_info[c].is_modem)
				continue; /* already created */
			if (pcm_dev >= AZX_MAX_PCMS) {
				snd_printk(KERN_ERR SFX "Too many modem PCMs\n");
				return -EINVAL;
			}
			err = create_codec_pcm(chip, codec, &codec->pcm_info[c], pcm_dev);
			if (err < 0)
				return err;
			chip->pcm[pcm_dev]->dev_class = SNDRV_PCM_CLASS_MODEM;
			pcm_dev++;
		}
	}
	return 0;
}

/*
 * mixer creation - all stuff is implemented in hda module
 */
static int __devinit azx_mixer_create(azx_t *chip)
{
	return snd_hda_build_controls(chip->bus);
}


/*
 * initialize SD streams
 */
static int __devinit azx_init_stream(azx_t *chip)
{
	int i;

	/* initialize each stream (aka device)
	 * assign the starting bdl address to each stream (device) and initialize
	 */
	for (i = 0; i < chip->num_streams; i++) {
		unsigned int off = sizeof(u32) * (i * AZX_MAX_FRAG * 4);
		azx_dev_t *azx_dev = &chip->azx_dev[i];
		azx_dev->bdl = (u32 *)(chip->bdl.area + off);
		azx_dev->bdl_addr = chip->bdl.addr + off;
		azx_dev->posbuf = (volatile u32 *)(chip->posbuf.area + i * 8);
		/* offset: SDI0=0x80, SDI1=0xa0, ... SDO3=0x160 */
		azx_dev->sd_addr = chip->remap_addr + (0x20 * i + 0x80);
		/* int mask: SDI0=0x01, SDI1=0x02, ... SDO3=0x80 */
		azx_dev->sd_int_sta_mask = 1 << i;
		/* stream tag: must be non-zero and unique */
		azx_dev->index = i;
		azx_dev->stream_tag = i + 1;
	}

	return 0;
}


#ifdef CONFIG_PM
/*
 * power management
 */
static int azx_suspend(
#ifndef SND_PCI_PM_CALLBACKS
		struct pci_dev *pci,
#else
		snd_card_t *card,
#endif
		pm_message_t state)
{
#ifndef SND_PCI_PM_CALLBACKS
	struct snd_card *card = pci_get_drvdata(pci);
	azx_t *chip = card->private_data;
#else
	azx_t *chip = card->pm_private_data;
#endif
	int i;

printk(KERN_ERR"%s: card=%p state=0x%x\n", __FUNCTION__, card, *((u32 *)&state));
	for (i = 0; i < chip->pcm_devs; i++)
		if (chip->pcm[i])
			snd_pcm_suspend_all(chip->pcm[i]);
	snd_hda_suspend(chip->bus, state);
	azx_free_cmd_io(chip);
	pci_disable_device(chip->pci);
#ifndef SND_PCI_PM_CALLBACKS
	pci_save_state(pci);
#endif
	return 0;
}

static int azx_resume(
#ifndef SND_PCI_PM_CALLBACKS
		struct pci_dev *pci
#else
		snd_card_t *card
#endif
)
{
#ifndef SND_PCI_PM_CALLBACKS
	struct snd_card *card = pci_get_drvdata(pci);
	azx_t *chip = card->private_data;
#else
	azx_t *chip = card->pm_private_data;
#endif

printk(KERN_ERR"%s: card=%p\n", __FUNCTION__, card);

#ifndef SND_PCI_PM_CALLBACKS
	pci_restore_state(pci);
#endif
	pci_enable_device(chip->pci);
	pci_set_master(chip->pci);
	azx_init_chip(chip);
	snd_hda_resume(chip->bus);
#ifndef SND_PCI_PM_CALLBACKS
	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
#endif
	return 0;
}
#endif /* CONFIG_PM */


/*
 * destructor
 */
static int azx_free(azx_t *chip)
{
//printk(KERN_ERR"%s: chip=%p\n", __FUNCTION__, chip);
	if (chip->initialized) {
		int i;

		for (i = 0; i < chip->num_streams; i++)
			azx_stream_stop(chip, &chip->azx_dev[i]);

		/* disable interrupts */
		azx_int_disable(chip);
		azx_int_clear(chip);

		/* disable CORB/RIRB */
		azx_free_cmd_io(chip);

		/* disable position buffer */
		azx_writel(chip, DPLBASE, 0);
		azx_writel(chip, DPUBASE, 0);

		/* wait a little for interrupts to finish */
		msleep(1);
	}

	if (chip->remap_addr)
		iounmap(chip->remap_addr);
	if (chip->irq >= 0)
		free_irq(chip->irq, (void*)chip);

	if (chip->bdl.area)
		snd_dma_free_pages(&chip->bdl);
	if (chip->rb.area)
		snd_dma_free_pages(&chip->rb);
	if (chip->posbuf.area)
		snd_dma_free_pages(&chip->posbuf);
	pci_release_regions(chip->pci);
	pci_disable_device(chip->pci);
	kfree(chip->azx_dev);
	kfree(chip);

	return 0;
}

static int azx_dev_free(snd_device_t *device)
{
//printk(KERN_ERR"%s: device=%p\n", __FUNCTION__, device);
	return azx_free(device->device_data);
}

/*
 * constructor
 */
static int __devinit azx_create(snd_card_t *card, struct pci_dev *pci,
				int posfix, int driver_type,
				azx_t **rchip)
{
	azx_t *chip;
	int err = 0;
	static snd_device_ops_t ops = {
		.dev_free = azx_dev_free,
	};

//printk(KERN_ERR"%s: pci=%p card=%p\n", __FUNCTION__, pci, card);
	*rchip = NULL;
	
	if ((err = pci_enable_device(pci)) < 0)
		return err;

	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
	
	if (NULL == chip) {
		snd_printk(KERN_ERR SFX "cannot allocate chip\n");
		pci_disable_device(pci);
		return -ENOMEM;
	}

	spin_lock_init(&chip->reg_lock);
	init_MUTEX(&chip->open_mutex);
	chip->card = card;
	chip->pci = pci;
	chip->irq = -1;
	chip->driver_type = driver_type;

	chip->position_fix = posfix;

#if BITS_PER_LONG != 64
	/* Fix up base address on ULI M5461 */
	if (chip->driver_type == AZX_DRIVER_ULI) {
		u16 tmp3;
		pci_read_config_word(pci, 0x40, &tmp3);
		pci_write_config_word(pci, 0x40, tmp3 | 0x10);
		pci_write_config_dword(pci, PCI_BASE_ADDRESS_1, 0);
	}
#endif

	if ((err = pci_request_regions(pci, "ICH HD audio")) < 0) {
		kfree(chip);
		pci_disable_device(pci);
		return err;
	}

	chip->addr = pci_resource_start(pci,0);
	chip->remap_addr = ioremap_nocache(chip->addr, pci_resource_len(pci,0));
	if (chip->remap_addr == NULL) {
		snd_printk(KERN_ERR SFX "ioremap error\n");
		err = -ENXIO;
		goto errout;
	}

	if (request_irq(pci->irq, azx_interrupt, SA_INTERRUPT|SA_SHIRQ,
			"HDA Intel", (void*)chip)) {
		snd_printk(KERN_ERR SFX "unable to grab IRQ %d\n", pci->irq);
		err = -EBUSY;
		goto errout;
	}
	chip->irq = pci->irq;

	pci_set_master(pci);
	synchronize_irq(chip->irq);

	switch (chip->driver_type) {
	case AZX_DRIVER_ULI:
		chip->playback_streams = ULI_NUM_PLAYBACK;
		chip->capture_streams = ULI_NUM_CAPTURE;
		chip->playback_index_offset = ULI_PLAYBACK_INDEX;
		chip->capture_index_offset = ULI_CAPTURE_INDEX;
		break;
	default:
		chip->playback_streams = ICH6_NUM_PLAYBACK;
		chip->capture_streams = ICH6_NUM_CAPTURE;
		chip->playback_index_offset = ICH6_PLAYBACK_INDEX;
		chip->capture_index_offset = ICH6_CAPTURE_INDEX;
		break;
	}
	chip->num_streams = chip->playback_streams + chip->capture_streams;
	chip->azx_dev = kcalloc(chip->num_streams, sizeof(*chip->azx_dev), GFP_KERNEL);
	if (! chip->azx_dev) {
		snd_printk(KERN_ERR "cannot malloc azx_dev\n");
		goto errout;
	}

	/* allocate memory for the BDL for each stream */
	if ((err = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
				       BDL_SIZE, &chip->bdl)) < 0) {
		snd_printk(KERN_ERR SFX "cannot allocate BDL\n");
		goto errout;
	}
	/* allocate memory for the position buffer */
	if ((err = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
				       chip->num_streams * 8, &chip->posbuf)) < 0) {
		snd_printk(KERN_ERR SFX "cannot allocate posbuf\n");
		goto errout;
	}
	/* allocate CORB/RIRB */
	if ((err = azx_alloc_cmd_io(chip)) < 0)
		goto errout;

	/* initialize streams */
	azx_init_stream(chip);

	/* initialize chip */
	azx_init_chip(chip);

	chip->initialized = 1;

	/* codec detection */
	if (! chip->codec_mask) {
		snd_printk(KERN_ERR SFX "no codecs found!\n");
		err = -ENODEV;
		goto errout;
	}

	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) <0) {
		snd_printk(KERN_ERR SFX "Error creating device [card]!\n");
		goto errout;
	}

	strcpy(card->driver, "HDA-Intel");
	strcpy(card->shortname, driver_short_names[chip->driver_type]);
	sprintf(card->longname, "%s at 0x%lx irq %i", card->shortname, chip->addr, chip->irq);

	*rchip = chip;
	return 0;

 errout:
	azx_free(chip);
	return err;
}

static int __devinit azx_probe(struct pci_dev *pci, const struct pci_device_id *pci_id)
{
	snd_card_t *card;
	azx_t *chip;
	int err = 0;

	card = snd_card_new(index, id, THIS_MODULE, 0);
	if (NULL == card) {
		snd_printk(KERN_ERR SFX "Error creating card!\n");
		return -ENOMEM;
	}

	if ((err = azx_create(card, pci, position_fix, pci_id->driver_data,
			      &chip)) < 0) {
		snd_card_free(card);
		return err;
	}

#ifndef SND_PCI_PM_CALLBACKS
	card->private_data = chip;
#endif

	/* create codec instances */
	if ((err = azx_codec_create(chip, model)) < 0) {
		snd_card_free(card);
		return err;
	}

	/* create PCM streams */
	if ((err = azx_pcm_create(chip)) < 0) {
		snd_card_free(card);
		return err;
	}

	/* create mixer controls */
	if ((err = azx_mixer_create(chip)) < 0) {
		snd_card_free(card);
		return err;
	}

#ifdef SND_PCI_PM_CALLBACKS
	snd_card_set_pm_callback(card, azx_suspend, azx_resume, chip);
#endif
	snd_card_set_dev(card, &pci->dev);

	if ((err = snd_card_register(card)) < 0) {
		snd_card_free(card);
		return err;
	}

	pci_set_drvdata(pci, card);

	return err;
}

static void __devexit azx_remove(struct pci_dev *pci)
{
	snd_card_t *card = pci_get_drvdata(pci);
#ifndef SND_PCI_PM_CALLBACKS
	azx_t *chip = card->private_data;
#else
	azx_t *chip = card->pm_private_data;
#endif

//printk(KERN_ERR"%s: pci=%p card=%p\n", __FUNCTION__, pci, pci_get_drvdata(pci));
	snd_hda_codec_remove_notify_all(chip->bus);
	snd_card_free(pci_get_drvdata(pci));
	pci_set_drvdata(pci, NULL);
}

/* PCI IDs */
static struct pci_device_id azx_ids[] = {
	{ 0x8086, 0x2668, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AZX_DRIVER_ICH }, /* ICH6 */
	{ 0x8086, 0x27d8, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AZX_DRIVER_ICH }, /* ICH7 */
	{ 0x8086, 0x269a, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AZX_DRIVER_ICH }, /* ESB2 */
	{ 0x1002, 0x437b, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AZX_DRIVER_ATI }, /* ATI SB450 */
	{ 0x1106, 0x3288, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AZX_DRIVER_VIA }, /* VIA VT8251/VT8237A */
	{ 0x1039, 0x7502, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AZX_DRIVER_SIS }, /* SIS966 */
	{ 0x10b9, 0x5461, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AZX_DRIVER_ULI }, /* ULI M5461 */
	{ 0x10de, 0x026c, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AZX_DRIVER_NVIDIA }, /* NVIDIA 026c */
	{ 0x10de, 0x0371, PCI_ANY_ID, PCI_ANY_ID, 0, 0, AZX_DRIVER_NVIDIA }, /* NVIDIA 0371 */
	{ 0, }
};
MODULE_DEVICE_TABLE(pci, azx_ids);

/* pci_driver definition */
static struct pci_driver driver = {
	.name = "HDA Intel",
	.id_table = azx_ids,
	.probe = azx_probe,
	.remove = __devexit_p(azx_remove),
#ifdef SND_PCI_PM_CALLBACKS
	SND_PCI_PM_CALLBACKS
#else
#ifdef CONFIG_PM
	.suspend = azx_suspend,
	.resume = azx_resume,
#endif
#endif
};

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

static void __exit alsa_card_azx_exit(void)
{
//printk(KERN_ERR"%s\n", __FUNCTION__);
	pci_unregister_driver(&driver);
}

module_init(alsa_card_azx_init)
module_exit(alsa_card_azx_exit)