ite8172.c

iis s3c2410-uda1341语音系统的 开发

	    s->dma_adc.ossmaxfrags = (val >> 16) & 0xffff;
	    if (s->dma_adc.ossfragshift < 4)
		s->dma_adc.ossfragshift = 4;
	    if (s->dma_adc.ossfragshift > 15)
		s->dma_adc.ossfragshift = 15;
	    if (s->dma_adc.ossmaxfrags < 4)
		s->dma_adc.ossmaxfrags = 4;
	    if ((ret = prog_dmabuf_adc(s)))
		return ret;
	}
	if (file->f_mode & FMODE_WRITE) {
	    stop_dac(s);
	    s->dma_dac.ossfragshift = val & 0xffff;
	    s->dma_dac.ossmaxfrags = (val >> 16) & 0xffff;
	    if (s->dma_dac.ossfragshift < 4)
		s->dma_dac.ossfragshift = 4;
	    if (s->dma_dac.ossfragshift > 15)
		s->dma_dac.ossfragshift = 15;
	    if (s->dma_dac.ossmaxfrags < 4)
		s->dma_dac.ossmaxfrags = 4;
	    if ((ret = prog_dmabuf_dac(s)))
		return ret;
	}
	return 0;

    case SNDCTL_DSP_SUBDIVIDE:
	if ((file->f_mode & FMODE_READ && s->dma_adc.subdivision) ||
	    (file->f_mode & FMODE_WRITE && s->dma_dac.subdivision))
	    return -EINVAL;
	if (get_user(val, (int *)arg))
	    return -EFAULT;
	if (val != 1 && val != 2 && val != 4)
	    return -EINVAL;
	if (file->f_mode & FMODE_READ) {
	    stop_adc(s);
	    s->dma_adc.subdivision = val;
	    if ((ret = prog_dmabuf_adc(s)))
		return ret;
	}
	if (file->f_mode & FMODE_WRITE) {
	    stop_dac(s);
	    s->dma_dac.subdivision = val;
	    if ((ret = prog_dmabuf_dac(s)))
		return ret;
	}
	return 0;

    case SOUND_PCM_READ_RATE:
	return put_user((file->f_mode & FMODE_READ) ?
			s->adcrate : s->dacrate, (int *)arg);

    case SOUND_PCM_READ_CHANNELS:
	if (file->f_mode & FMODE_READ)
	    return put_user((s->capcc & CC_SM) ? 2 : 1, (int *)arg);
	else
	    return put_user((s->pcc & CC_SM) ? 2 : 1, (int *)arg);
	    
    case SOUND_PCM_READ_BITS:
	if (file->f_mode & FMODE_READ)
	    return put_user((s->capcc & CC_DF) ? 16 : 8, (int *)arg);
	else
	    return put_user((s->pcc & CC_DF) ? 16 : 8, (int *)arg);

    case SOUND_PCM_WRITE_FILTER:
    case SNDCTL_DSP_SETSYNCRO:
    case SOUND_PCM_READ_FILTER:
	return -EINVAL;
    }

    return mixdev_ioctl(&s->codec, cmd, arg);
}


static int it8172_open(struct inode *inode, struct file *file)
{
    int minor = MINOR(inode->i_rdev);
    DECLARE_WAITQUEUE(wait, current);
    unsigned long flags;
    struct list_head *list;
    struct it8172_state *s;
    int ret;
    
    for (list = devs.next; ; list = list->next) {
	if (list == &devs)
	    return -ENODEV;
	s = list_entry(list, struct it8172_state, devs);
	if (!((s->dev_audio ^ minor) & ~0xf))
	    break;
    }
    file->private_data = s;
    /* wait for device to become free */
    down(&s->open_sem);
    while (s->open_mode & file->f_mode) {
	if (file->f_flags & O_NONBLOCK) {
	    up(&s->open_sem);
	    return -EBUSY;
	}
	add_wait_queue(&s->open_wait, &wait);
	__set_current_state(TASK_INTERRUPTIBLE);
	up(&s->open_sem);
	schedule();
	remove_wait_queue(&s->open_wait, &wait);
	set_current_state(TASK_RUNNING);
	if (signal_pending(current))
	    return -ERESTARTSYS;
	down(&s->open_sem);
    }

    spin_lock_irqsave(&s->lock, flags);

    if (file->f_mode & FMODE_READ) {
	s->dma_adc.ossfragshift = s->dma_adc.ossmaxfrags =
	    s->dma_adc.subdivision = s->dma_adc.total_bytes = 0;
	s->capcc &= ~(CC_SM | CC_DF);
	set_adc_rate(s, 8000);
	if ((minor & 0xf) == SND_DEV_DSP16)
	    s->capcc |= CC_DF;
	outw(s->capcc, s->io+IT_AC_CAPCC);
	if ((ret = prog_dmabuf_adc(s)))
	    return ret;
    }
    if (file->f_mode & FMODE_WRITE) {
	s->dma_dac.ossfragshift = s->dma_dac.ossmaxfrags =
	    s->dma_dac.subdivision = s->dma_dac.total_bytes = 0;
	s->pcc &= ~(CC_SM | CC_DF);
	set_dac_rate(s, 8000);
	if ((minor & 0xf) == SND_DEV_DSP16)
	    s->pcc |= CC_DF;
	outw(s->pcc, s->io+IT_AC_PCC);
	if ((ret = prog_dmabuf_dac(s)))
	    return ret;
    }

    spin_unlock_irqrestore(&s->lock, flags);

    s->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
    up(&s->open_sem);
    return 0;
}

static int it8172_release(struct inode *inode, struct file *file)
{
    struct it8172_state *s = (struct it8172_state *)file->private_data;

    lock_kernel();
    if (file->f_mode & FMODE_WRITE)
	drain_dac(s, file->f_flags & O_NONBLOCK);
    down(&s->open_sem);
    if (file->f_mode & FMODE_WRITE) {
	stop_dac(s);
	dealloc_dmabuf(s, &s->dma_dac);
    }
    if (file->f_mode & FMODE_READ) {
	stop_adc(s);
	dealloc_dmabuf(s, &s->dma_adc);
    }
    s->open_mode &= (~file->f_mode) & (FMODE_READ|FMODE_WRITE);
    up(&s->open_sem);
    wake_up(&s->open_wait);
    unlock_kernel();
    return 0;
}

static /*const*/ struct file_operations it8172_audio_fops = {
    owner:	THIS_MODULE,
    llseek:	it8172_llseek,
    read:	it8172_read,
    write:	it8172_write,
    poll:	it8172_poll,
    ioctl:	it8172_ioctl,
    mmap:	it8172_mmap,
    open:	it8172_open,
    release:	it8172_release,
};


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


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

/*
 * for debugging purposes, we'll create a proc device that dumps the
 * CODEC chipstate
 */

#ifdef IT8172_DEBUG
static int proc_it8172_dump (char *buf, char **start, off_t fpos,
			     int length, int *eof, void *data)
{
    struct it8172_state *s;
    int cnt, len = 0;

    if (list_empty(&devs))
	return 0;
    s = list_entry(devs.next, struct it8172_state, devs);

    /* print out header */
    len += sprintf(buf + len, "\n\t\tIT8172 Audio Debug\n\n");

    // print out digital controller state
    len += sprintf (buf + len, "IT8172 Audio Controller registers\n");
    len += sprintf (buf + len, "---------------------------------\n");
    cnt=0;
    while (cnt < 0x72) {
	if (cnt == IT_AC_PCB1STA || cnt == IT_AC_PCB2STA ||
	    cnt == IT_AC_CAPB1STA || cnt == IT_AC_CAPB2STA ||
	    cnt == IT_AC_PFDP) {
	    len+= sprintf (buf + len, "reg %02x = %08x\n",
			   cnt, inl(s->io+cnt));
	    cnt += 4;
	} else {
	    len+= sprintf (buf + len, "reg %02x = %04x\n",
			   cnt, inw(s->io+cnt));
	    cnt += 2;
	}
    }
    
    /* print out CODEC state */
    len += sprintf (buf + len, "\nAC97 CODEC registers\n");
    len += sprintf (buf + len, "----------------------\n");
    for (cnt=0; cnt <= 0x7e; cnt = cnt +2)
	len+= sprintf (buf + len, "reg %02x = %04x\n",
		       cnt, rdcodec(&s->codec, cnt));

    if (fpos >=len){
	*start = buf;
	*eof =1;
	return 0;
    }
    *start = buf + fpos;
    if ((len -= fpos) > length)
	return length;
    *eof =1;
    return len;

}
#endif /* IT8172_DEBUG */

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

/* maximum number of devices; only used for command line params */
#define NR_DEVICE 5

static int spdif[NR_DEVICE] = { 0, };

static unsigned int devindex = 0;

MODULE_PARM(spdif, "1-" __MODULE_STRING(NR_DEVICE) "i");
MODULE_PARM_DESC(spdif, "if 1 the S/PDIF digital output is enabled");

MODULE_AUTHOR("Monta Vista Software, [e-mail]");
MODULE_DESCRIPTION("IT8172 AudioPCI97 Driver");
MODULE_LICENSE("GPL");

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

static int __devinit it8172_probe(struct pci_dev *pcidev,
				  const struct pci_device_id *pciid)
{
    struct it8172_state *s;
    int i, val;
    unsigned short pcisr, vol;
    unsigned char legacy, imc;
    char proc_str[80];
    
    if (pcidev->irq == 0) 
	return -1;

    if (!(s = kmalloc(sizeof(struct it8172_state), GFP_KERNEL))) {
	printk(KERN_ERR PFX "alloc of device struct failed\n");
	return -1;
    }
	
    memset(s, 0, sizeof(struct it8172_state));
    init_waitqueue_head(&s->dma_adc.wait);
    init_waitqueue_head(&s->dma_dac.wait);
    init_waitqueue_head(&s->open_wait);
    init_MUTEX(&s->open_sem);
    spin_lock_init(&s->lock);
    s->dev = pcidev;
    s->io = pci_resource_start(pcidev, 0);
    s->irq = pcidev->irq;
    s->vendor = pcidev->vendor;
    s->device = pcidev->device;
    pci_read_config_byte(pcidev, PCI_REVISION_ID, &s->rev);
    s->codec.private_data = s;
    s->codec.id = 0;
    s->codec.codec_read = rdcodec;
    s->codec.codec_write = wrcodec;
    s->codec.codec_wait = waitcodec;

    if (!request_region(s->io, pci_resource_len(pcidev,0),
			IT8172_MODULE_NAME)) {
	printk(KERN_ERR PFX "io ports %#lx->%#lx in use\n",
		s->io, s->io + pci_resource_len(pcidev,0)-1);
	goto err_region;
    }
    if (request_irq(s->irq, it8172_interrupt, SA_INTERRUPT,
		    IT8172_MODULE_NAME, s)) {
	printk(KERN_ERR PFX "irq %u in use\n", s->irq);
	goto err_irq;
    }

    printk(KERN_INFO PFX "IO at %#lx, IRQ %d\n", s->io, s->irq);

    /* register devices */
    if ((s->dev_audio = register_sound_dsp(&it8172_audio_fops, -1)) < 0)
	goto err_dev1;
    if ((s->codec.dev_mixer =
	 register_sound_mixer(&it8172_mixer_fops, -1)) < 0)
	goto err_dev2;

#ifdef IT8172_DEBUG
    /* intialize the debug proc device */
    s->ps = create_proc_read_entry(IT8172_MODULE_NAME, 0, NULL,
				   proc_it8172_dump, NULL);
#endif /* IT8172_DEBUG */
	
    /*
     * Reset the Audio device using the IT8172 PCI Reset register. This
     * creates an audible double click on a speaker connected to Line-out.
     */
    IT_IO_READ16(IT_PM_PCISR, pcisr);
    pcisr |= IT_PM_PCISR_ACSR;
    IT_IO_WRITE16(IT_PM_PCISR, pcisr);
    /* wait up to 100msec for reset to complete */
    for (i=0; pcisr & IT_PM_PCISR_ACSR; i++) {
	it8172_delay(10);
	if (i == 10)
	    break;
	IT_IO_READ16(IT_PM_PCISR, pcisr);
    }
    if (i == 10) {
	printk(KERN_ERR PFX "chip reset timeout!\n");
	goto err_dev3;
    }
    
    /* enable pci io and bus mastering */
    if (pci_enable_device(pcidev))
	goto err_dev3;
    pci_set_master(pcidev);

    /* get out of legacy mode */
    pci_read_config_byte (pcidev, 0x40, &legacy);
    pci_write_config_byte (pcidev, 0x40, legacy & ~1);
    
    s->spdif_volume = -1;
    /* check to see if s/pdif mode is being requested */
    if (spdif[devindex]) {
	printk(KERN_INFO PFX "enabling S/PDIF output\n");
	s->spdif_volume = 0;
	outb(GC_SOE, s->io+IT_AC_GC);
    } else {
	printk(KERN_INFO PFX "disabling S/PDIF output\n");
	outb(0, s->io+IT_AC_GC);
    }
    
    /* cold reset the AC97 */
    outw(CODECC_CR, s->io+IT_AC_CODECC);
    udelay(1000);
    outw(0, s->io+IT_AC_CODECC);
    /* need to delay around 500msec(bleech) to give
       some CODECs enough time to wakeup */
    it8172_delay(500);
    
    /* AC97 warm reset to start the bitclk */
    outw(CODECC_WR, s->io+IT_AC_CODECC);
    udelay(1000);
    outw(0, s->io+IT_AC_CODECC);
    
    /* codec init */
    if (!ac97_probe_codec(&s->codec))
	goto err_dev3;

    /* Enable Volume button interrupts */
    imc = inb(s->io+IT_AC_IMC);
    outb(imc & ~IMC_VCIM, s->io+IT_AC_IMC);

    /* Un-mute PCM and FM out on the controller */
    vol = inw(s->io+IT_AC_PCMOV);
    outw(vol & ~PCMOV_PCMOM, s->io+IT_AC_PCMOV);
    vol = inw(s->io+IT_AC_FMOV);
    outw(vol & ~FMOV_FMOM, s->io+IT_AC_FMOV);

    /* set channel defaults to 8-bit, mono, 8 Khz */
    s->pcc = 0;
    s->capcc = 0;
    set_dac_rate(s, 8000);
    set_adc_rate(s, 8000);

    /* set mic to be the recording source */
    val = SOUND_MASK_MIC;
    mixdev_ioctl(&s->codec, SOUND_MIXER_WRITE_RECSRC, (unsigned long)&val);

    /* mute master and PCM when in S/PDIF mode */
    if (s->spdif_volume != -1) {
	val = 0x0000;
	mixdev_ioctl(&s->codec, SOUND_MIXER_WRITE_VOLUME,
		     (unsigned long)&val);
	mixdev_ioctl(&s->codec, SOUND_MIXER_WRITE_PCM,
		     (unsigned long)&val);
    }
    
#ifdef IT8172_DEBUG
    sprintf(proc_str, "driver/%s/%d/ac97", IT8172_MODULE_NAME, s->codec.id);
    s->ac97_ps = create_proc_read_entry (proc_str, 0, NULL,
					 ac97_read_proc, &s->codec);
#endif
    
    /* store it in the driver field */
    pci_set_drvdata(pcidev, s);
    pcidev->dma_mask = 0xffffffff;
    /* put it into driver list */
    list_add_tail(&s->devs, &devs);
    /* increment devindex */
    if (devindex < NR_DEVICE-1)
	devindex++;
    return 0;

 err_dev3:
    unregister_sound_mixer(s->codec.dev_mixer);
 err_dev2:
    unregister_sound_dsp(s->dev_audio);
 err_dev1:
    printk(KERN_ERR PFX "cannot register misc device\n");
    free_irq(s->irq, s);
 err_irq:
    release_region(s->io, pci_resource_len(pcidev,0));
 err_region:
    kfree(s);
    return -1;
}

static void __devinit it8172_remove(struct pci_dev *dev)
{
    struct it8172_state *s = pci_get_drvdata(dev);

    if (!s)
	return;
    list_del(&s->devs);
#ifdef IT8172_DEBUG
    if (s->ps)
	remove_proc_entry(IT8172_MODULE_NAME, NULL);
#endif /* IT8172_DEBUG */
    synchronize_irq();
    free_irq(s->irq, s);
    release_region(s->io, pci_resource_len(dev,0));
    unregister_sound_dsp(s->dev_audio);
    unregister_sound_mixer(s->codec.dev_mixer);
    kfree(s);
    pci_set_drvdata(dev, NULL);
}



static struct pci_device_id id_table[] __devinitdata = {
    { PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_IT8172G_AUDIO, PCI_ANY_ID,
      PCI_ANY_ID, 0, 0 },
    { 0, }
};

MODULE_DEVICE_TABLE(pci, id_table);

static struct pci_driver it8172_driver = {
    name: IT8172_MODULE_NAME,
    id_table: id_table,
    probe: it8172_probe,
    remove: it8172_remove
};

static int __init init_it8172(void)
{
    if (!pci_present())   /* No PCI bus in this machine! */
	return -ENODEV;
    printk("version v0.26 time " __TIME__ " " __DATE__ "\n");
    return pci_module_init(&it8172_driver);
}

static void __exit cleanup_it8172(void)
{
    printk(KERN_INFO PFX "unloading\n");
    pci_unregister_driver(&it8172_driver);
}

module_init(init_it8172);
module_exit(cleanup_it8172);