nec_vrc5477.c

iis s3c2410-uda1341语音系统的 开发

				if (signal_pending(current)) {
					if (!ret)
						ret = -ERESTARTSYS;
					return ret;
				}
			}
		} while (avail <= 0);

		MIPS_ASSERT( (avail % db->fragSize) == 0);
		copyCount = copy_adc_to_user(s, buffer, count, avail);
		if (copyCount <=0 ) {
			if (!ret) ret = -EFAULT;
			return ret;
		}

		count -= copyCount;
		buffer += copyCount;
		ret += copyCount;
	} // while (count > 0)

	return ret;
}

static int inline 
copy_two_channel_dac_from_user(struct vrc5477_ac97_state *s, 
			       const char *buffer, 
			       int copyCount)
{
	struct dmabuf *db = &s->dma_dac;
	int bufStart = db->nextIn;

	MIPS_ASSERT(db->ready);

        for (; copyCount > 0; ) {
                int i;
                int count = copyCount;
                if (count > WORK_BUF_SIZE/2) count = WORK_BUF_SIZE/2;
                if (copy_from_user(s->workBuf, buffer, count*2)) {
                        return -1;
                }
                for (i=0; i< count/2; i++) {
			*(u16*)(db->lbuf + bufStart + i*2) = 
				s->workBuf[i].lchannel;
			*(u16*)(db->rbuf + bufStart + i*2) = 
				s->workBuf[i].rchannel;
                }

                copyCount -= count;
		bufStart += count;
		MIPS_ASSERT(bufStart <= db->fragTotalSize);
                buffer += count *2;
        }
        return 0;

}

/* return the total bytes that is copied */
static int inline 
copy_dac_from_user(struct vrc5477_ac97_state *s, 
		   const char *buffer, 
		   size_t count, 
		   int avail)
{	
        struct dmabuf *db = &s->dma_dac;
        int copyCount=0;
        int copyFragCount=0;
        int totalCopyCount = 0;
        int totalCopyFragCount = 0;
        unsigned long flags;
#if defined(VRC5477_AC97_VERBOSE_DEBUG)
	int i;
#endif

        /* adjust count to signel channel byte count */
        count >>= s->dacChannels - 1;

        /* we may have to "copy" twice as ring buffer wraps around */
        for (; (avail > 0) && (count > 0); ) {
                /* determine max possible copy count for single channel */
                copyCount = count;
                if (copyCount > avail) {
                        copyCount = avail;
		}
                if (copyCount + db->nextIn > db->fragTotalSize) {
                        copyCount = db->fragTotalSize - db->nextIn;
                        MIPS_ASSERT((copyCount % db->fragSize) == 0);
                        MIPS_ASSERT(copyCount > 0);
                }

		copyFragCount = (copyCount-1) >> db->fragShift;
		copyFragCount = (copyFragCount+1) << db->fragShift;
		MIPS_ASSERT(copyFragCount >= copyCount);

		/* we copy differently based on the number channels */
		if (s->dacChannels == 1) {
			if (copy_from_user(db->lbuf + db->nextIn,
					   buffer,
					   copyCount)) 
				return -1;
			/* fill gaps with 0 */
			memset(db->lbuf + db->nextIn + copyCount,
			       0,
			       copyFragCount - copyCount);
		} else {
			/* we have demux the stream into two separate ones */
			if (copy_two_channel_dac_from_user(s, buffer, copyCount))
				return -1;
			/* fill gaps with 0 */
			memset(db->lbuf + db->nextIn + copyCount,
			       0,
			       copyFragCount - copyCount);
			memset(db->rbuf + db->nextIn + copyCount,
			       0,
			       copyFragCount - copyCount);
		}

#if defined(VRC5477_AC97_VERBOSE_DEBUG)
		for (i=0; i< copyFragCount; i+= db->fragSize) {
			*(u16*)(db->lbuf + db->nextIn + i) = inTicket ++;
		}
#endif

		count -= copyCount;
		totalCopyCount =+ copyCount;
		avail -= copyFragCount;
		totalCopyFragCount += copyFragCount;

		buffer += copyCount << (s->dacChannels - 1);

		db->nextIn += copyFragCount;
		if (db->nextIn >= db->fragTotalSize) {
			MIPS_ASSERT(db->nextIn == db->fragTotalSize);
			db->nextIn = 0;
		}

		MIPS_ASSERT((copyFragCount % db->fragSize) == 0);
		MIPS_ASSERT( (count == 0) || (copyCount == copyFragCount));
	}

	spin_lock_irqsave(&s->lock, flags);
        db->count += totalCopyFragCount;
	if (db->stopped) {
		start_dac(s);
	}

	/* nextIn should not be equal to nextOut unless we are full */
	MIPS_ASSERT( ( (db->count == db->fragTotalSize) && 
                       (db->nextIn == db->nextOut) ) ||
                     ( (db->count < db->fragTotalSize) &&
                       (db->nextIn != db->nextOut) ) );

        spin_unlock_irqrestore(&s->lock, flags);

        return totalCopyCount << (s->dacChannels-1);

}

static ssize_t vrc5477_ac97_write(struct file *file, const char *buffer,
				  size_t count, loff_t *ppos)
{
	struct vrc5477_ac97_state *s = 
		(struct vrc5477_ac97_state *)file->private_data;
	struct dmabuf *db = &s->dma_dac;
	ssize_t ret;
	unsigned long flags;
	int copyCount, avail;

	if (ppos != &file->f_pos)
		return -ESPIPE;
	if (!access_ok(VERIFY_READ, buffer, count))
		return -EFAULT;
	ret = 0;
    
	while (count > 0) {
		// wait for space in playback buffer
		do {
			spin_lock_irqsave(&s->lock, flags);
			avail = db->fragTotalSize - db->count;
			spin_unlock_irqrestore(&s->lock, flags);
			if (avail <= 0) {
				if (file->f_flags & O_NONBLOCK) {
					if (!ret)
						ret = -EAGAIN;
					return ret;
				}
				interruptible_sleep_on(&db->wait);
				if (signal_pending(current)) {
					if (!ret)
						ret = -ERESTARTSYS;
					return ret;
				}
			}
		} while (avail <= 0);
	
		MIPS_ASSERT( (avail % db->fragSize) == 0);
		copyCount = copy_dac_from_user(s, buffer, count, avail);
		if (copyCount < 0) {
			if (!ret) ret = -EFAULT;
			return ret;
		}

		count -= copyCount;
		buffer += copyCount;
		ret += copyCount;
	} // while (count > 0)
	
	return ret;
}

/* No kernel lock - we have our own spinlock */
static unsigned int vrc5477_ac97_poll(struct file *file,
				      struct poll_table_struct *wait)
{
	struct vrc5477_ac97_state *s = (struct vrc5477_ac97_state *)file->private_data;
	unsigned long flags;
	unsigned int mask = 0;

	if (file->f_mode & FMODE_WRITE)
		poll_wait(file, &s->dma_dac.wait, wait);
	if (file->f_mode & FMODE_READ)
		poll_wait(file, &s->dma_adc.wait, wait);
	spin_lock_irqsave(&s->lock, flags);
	if (file->f_mode & FMODE_READ) {
		if (s->dma_adc.count >= (signed)s->dma_adc.fragSize)
			mask |= POLLIN | POLLRDNORM;
	}
	if (file->f_mode & FMODE_WRITE) {
		if ((signed)s->dma_dac.fragTotalSize >=
		    s->dma_dac.count + (signed)s->dma_dac.fragSize)
			mask |= POLLOUT | POLLWRNORM;
	}
	spin_unlock_irqrestore(&s->lock, flags);
	return mask;
}

#ifdef CONFIG_LL_DEBUG
static struct ioctl_str_t {
    unsigned int cmd;
    const char* str;
} ioctl_str[] = {
    {SNDCTL_DSP_RESET, "SNDCTL_DSP_RESET"},
    {SNDCTL_DSP_SYNC, "SNDCTL_DSP_SYNC"},
    {SNDCTL_DSP_SPEED, "SNDCTL_DSP_SPEED"},
    {SNDCTL_DSP_STEREO, "SNDCTL_DSP_STEREO"},
    {SNDCTL_DSP_GETBLKSIZE, "SNDCTL_DSP_GETBLKSIZE"},
    {SNDCTL_DSP_SETFMT, "SNDCTL_DSP_SETFMT"},
    {SNDCTL_DSP_SAMPLESIZE, "SNDCTL_DSP_SAMPLESIZE"},
    {SNDCTL_DSP_CHANNELS, "SNDCTL_DSP_CHANNELS"},
    {SOUND_PCM_WRITE_CHANNELS, "SOUND_PCM_WRITE_CHANNELS"},
    {SOUND_PCM_WRITE_FILTER, "SOUND_PCM_WRITE_FILTER"},
    {SNDCTL_DSP_POST, "SNDCTL_DSP_POST"},
    {SNDCTL_DSP_SUBDIVIDE, "SNDCTL_DSP_SUBDIVIDE"},
    {SNDCTL_DSP_SETFRAGMENT, "SNDCTL_DSP_SETFRAGMENT"},
    {SNDCTL_DSP_GETFMTS, "SNDCTL_DSP_GETFMTS"},
    {SNDCTL_DSP_GETOSPACE, "SNDCTL_DSP_GETOSPACE"},
    {SNDCTL_DSP_GETISPACE, "SNDCTL_DSP_GETISPACE"},
    {SNDCTL_DSP_NONBLOCK, "SNDCTL_DSP_NONBLOCK"},
    {SNDCTL_DSP_GETCAPS, "SNDCTL_DSP_GETCAPS"},
    {SNDCTL_DSP_GETTRIGGER, "SNDCTL_DSP_GETTRIGGER"},
    {SNDCTL_DSP_SETTRIGGER, "SNDCTL_DSP_SETTRIGGER"},
    {SNDCTL_DSP_GETIPTR, "SNDCTL_DSP_GETIPTR"},
    {SNDCTL_DSP_GETOPTR, "SNDCTL_DSP_GETOPTR"},
    {SNDCTL_DSP_MAPINBUF, "SNDCTL_DSP_MAPINBUF"},
    {SNDCTL_DSP_MAPOUTBUF, "SNDCTL_DSP_MAPOUTBUF"},
    {SNDCTL_DSP_SETSYNCRO, "SNDCTL_DSP_SETSYNCRO"},
    {SNDCTL_DSP_SETDUPLEX, "SNDCTL_DSP_SETDUPLEX"},
    {SNDCTL_DSP_GETODELAY, "SNDCTL_DSP_GETODELAY"},
    {SNDCTL_DSP_GETCHANNELMASK, "SNDCTL_DSP_GETCHANNELMASK"},
    {SNDCTL_DSP_BIND_CHANNEL, "SNDCTL_DSP_BIND_CHANNEL"},
    {OSS_GETVERSION, "OSS_GETVERSION"},
    {SOUND_PCM_READ_RATE, "SOUND_PCM_READ_RATE"},
    {SOUND_PCM_READ_CHANNELS, "SOUND_PCM_READ_CHANNELS"},
    {SOUND_PCM_READ_BITS, "SOUND_PCM_READ_BITS"},
    {SOUND_PCM_READ_FILTER, "SOUND_PCM_READ_FILTER"}
};
#endif    

static int vrc5477_ac97_ioctl(struct inode *inode, struct file *file,
			unsigned int cmd, unsigned long arg)
{
	struct vrc5477_ac97_state *s = (struct vrc5477_ac97_state *)file->private_data;
	unsigned long flags;
	audio_buf_info abinfo;
	int count;
	int val, ret;

#ifdef CONFIG_LL_DEBUG
	for (count=0; count<sizeof(ioctl_str)/sizeof(ioctl_str[0]); count++) {
		if (ioctl_str[count].cmd == cmd)
			break;
	}
	if (count < sizeof(ioctl_str)/sizeof(ioctl_str[0]))
		printk(KERN_INFO PFX "ioctl %s\n", ioctl_str[count].str);
	else
		printk(KERN_INFO PFX "ioctl unknown, 0x%x\n", cmd);
#endif
    
	switch (cmd) {
	case OSS_GETVERSION:
		return put_user(SOUND_VERSION, (int *)arg);

	case SNDCTL_DSP_SYNC:
		if (file->f_mode & FMODE_WRITE)
			return drain_dac(s, file->f_flags & O_NONBLOCK);
		return 0;
		
	case SNDCTL_DSP_SETDUPLEX:
		return 0;

	case SNDCTL_DSP_GETCAPS:
		return put_user(DSP_CAP_DUPLEX, (int *)arg);
		
	case SNDCTL_DSP_RESET:
		if (file->f_mode & FMODE_WRITE) {
			stop_dac(s);
			synchronize_irq();
			s->dma_dac.count = 0;
			s->dma_dac.nextIn = s->dma_dac.nextOut = 0;
		}
		if (file->f_mode & FMODE_READ) {
			stop_adc(s);
			synchronize_irq();
			s->dma_adc.count = 0;
			s->dma_adc.nextIn = s->dma_adc.nextOut = 0;
		}
		return 0;

	case SNDCTL_DSP_SPEED:
		if (get_user(val, (int *)arg))
			return -EFAULT;
		if (val >= 0) {
			if (file->f_mode & FMODE_READ) {
				stop_adc(s);
				set_adc_rate(s, val);
				if ((ret = prog_dmabuf_adc(s)))
					return ret;
			}
			if (file->f_mode & FMODE_WRITE) {
				stop_dac(s);
				set_dac_rate(s, val);
				if ((ret = prog_dmabuf_dac(s)))
					return ret;
			}
		}
		return put_user((file->f_mode & FMODE_READ) ?
				s->adcRate : s->dacRate, (int *)arg);

	case SNDCTL_DSP_STEREO:
		if (get_user(val, (int *)arg))
			return -EFAULT;
		if (file->f_mode & FMODE_READ) {
			stop_adc(s);
			if (val)
				s->adcChannels = 2;
			else
				s->adcChannels = 1;
			if ((ret = prog_dmabuf_adc(s)))
				return ret;
		}
		if (file->f_mode & FMODE_WRITE) {
			stop_dac(s);
			if (val)
				s->dacChannels = 2;
			else
				s->dacChannels = 1;
			if ((ret = prog_dmabuf_dac(s)))
				return ret;
		}
		return 0;

	case SNDCTL_DSP_CHANNELS:
		if (get_user(val, (int *)arg))
			return -EFAULT;
		if (val != 0) {
			if ( (val != 1) && (val != 2)) val = 2;

			if (file->f_mode & FMODE_READ) {
				stop_adc(s);
				s->dacChannels = val;
				if ((ret = prog_dmabuf_adc(s)))
					return ret;
			}
			if (file->f_mode & FMODE_WRITE) {
				stop_dac(s);
				s->dacChannels = val;
				if ((ret = prog_dmabuf_dac(s)))
					return ret;
			}
		}
		return put_user(val, (int *)arg);
		
	case SNDCTL_DSP_GETFMTS: /* Returns a mask */
		return put_user(AFMT_S16_LE, (int *)arg);
		
	case SNDCTL_DSP_SETFMT: /* Selects ONE fmt*/
		if (get_user(val, (int *)arg))
			return -EFAULT;
		if (val != AFMT_QUERY) {
			if (val != AFMT_S16_LE) return -EINVAL;
			if (file->f_mode & FMODE_READ) {
				stop_adc(s);
				if ((ret = prog_dmabuf_adc(s)))
					return ret;
			}
			if (file->f_mode & FMODE_WRITE) {
				stop_dac(s);
				if ((ret = prog_dmabuf_dac(s)))
					return ret;
			}
		} else {
			val = AFMT_S16_LE;
		}
		return put_user(val, (int *)arg);
		
	case SNDCTL_DSP_POST:
		return 0;

	case SNDCTL_DSP_GETTRIGGER:
	case SNDCTL_DSP_SETTRIGGER:
		/* NO trigger */
		return -EINVAL;

	case SNDCTL_DSP_GETOSPACE:
		if (!(file->f_mode & FMODE_WRITE))
			return -EINVAL;
		abinfo.fragsize = s->dma_dac.fragSize << (s->dacChannels-1);
		spin_lock_irqsave(&s->lock, flags);
		count = s->dma_dac.count;
		spin_unlock_irqrestore(&s->lock, flags);
		abinfo.bytes = (s->dma_dac.fragTotalSize - count) << 
			(s->dacChannels-1);
		abinfo.fragstotal = s->dma_dac.numFrag;
		abinfo.fragments = abinfo.bytes >> s->dma_dac.fragShift >> 
			(s->dacChannels-1);      
		return copy_to_user((void *)arg, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;

	case SNDCTL_DSP_GETISPACE:
		if (!(file->f_mode & FMODE_READ))
			return -EINVAL;
		abinfo.fragsize = s->dma_adc.fragSize << (s->adcChannels-1);
		spin_lock_irqsave(&s->lock, flags);
		count = s->dma_adc.count;
		spin_unlock_irqrestore(&s->lock, flags);
		if (count < 0)
			count = 0;
		abinfo.bytes = count << (s->adcChannels-1);
		abinfo.fragstotal = s->dma_adc.numFrag;
		abinfo.fragments = (abinfo.bytes >> s->dma_adc.fragShift) >>
			(s->adcChannels-1);      
		return copy_to_user((void *)arg, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;
		
	case SNDCTL_DSP_NONBLOCK:
		file->f_flags |= O_NONBLOCK;
		return 0;

	case SNDCTL_DSP_GETODELAY:
		if (!(file->f_mode & FMODE_WRITE))
			return -EINVAL;
		spin_lock_irqsave(&s->lock, flags);
		count = s->dma_dac.count;
		spin_unlock_irqrestore(&s->lock, flags);
		return put_user(count, (int *)arg);

	case SNDCTL_DSP_GETIPTR:
	case SNDCTL_DSP_GETOPTR:
		/* we cannot get DMA ptr */
		return -EINVAL;

	case SNDCTL_DSP_GETBLKSIZE:
		if (file->f_mode & FMODE_WRITE)
			return put_user(s->dma_dac.fragSize << (s->dacChannels-1), (int *)arg);
		else
			return put_user(s->dma_adc.fragSize << (s->adcChannels-1), (int *)arg);

	case SNDCTL_DSP_SETFRAGMENT:
		/* we ignore fragment size request */
		return 0;

	case SNDCTL_DSP_SUBDIVIDE:
		/* what is this for? [jsun] */
		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->adcChannels, (int *)arg);
		else
			return put_user(s->dacChannels ? 2 : 1, (int *)arg);
	    
	case SOUND_PCM_READ_BITS:
		return put_user(16, (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 vrc5477_ac97_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 vrc5477_ac97_state *s;