sonicvibes.c

iis s3c2410-uda1341语音系统的 开发

				spin_lock_irqsave(&s->lock, flags);
				set_dmac(s, virt_to_bus(s->dma_adc.rawbuf), s->dma_adc.numfrag << s->dma_adc.fragshift);
				/* program enhanced mode registers */
				wrindir(s, SV_CIDMACBASECOUNT1, (s->dma_adc.fragsamples-1) >> 8);
				wrindir(s, SV_CIDMACBASECOUNT0, s->dma_adc.fragsamples-1);
				s->dma_adc.count = s->dma_adc.hwptr = s->dma_adc.swptr = 0;
				spin_unlock_irqrestore(&s->lock, flags);
			}
			if (signal_pending(current)) {
				if (!ret)
					ret = -ERESTARTSYS;
				break;
			}
			continue;
		}
		if (copy_to_user(buffer, s->dma_adc.rawbuf + swptr, cnt)) {
			if (!ret)
				ret = -EFAULT;
			break;
		}
		swptr = (swptr + cnt) % s->dma_adc.dmasize;
		spin_lock_irqsave(&s->lock, flags);
		s->dma_adc.swptr = swptr;
		s->dma_adc.count -= cnt;
		spin_unlock_irqrestore(&s->lock, flags);
		count -= cnt;
		buffer += cnt;
		ret += cnt;
		if (s->dma_adc.enabled)
			start_adc(s);
	}
        remove_wait_queue(&s->dma_adc.wait, &wait);
	set_current_state(TASK_RUNNING);
	return ret;
}

static ssize_t sv_write(struct file *file, const char *buffer, size_t count, loff_t *ppos)
{
	struct sv_state *s = (struct sv_state *)file->private_data;
	DECLARE_WAITQUEUE(wait, current);
	ssize_t ret;
	unsigned long flags;
	unsigned swptr;
	int cnt;

	VALIDATE_STATE(s);
	if (ppos != &file->f_pos)
		return -ESPIPE;
	if (s->dma_dac.mapped)
		return -ENXIO;
	if (!s->dma_dac.ready && (ret = prog_dmabuf(s, 0)))
		return ret;
	if (!access_ok(VERIFY_READ, buffer, count))
		return -EFAULT;
	ret = 0;
#if 0
	spin_lock_irqsave(&s->lock, flags);
	sv_update_ptr(s);
	spin_unlock_irqrestore(&s->lock, flags);
#endif
        add_wait_queue(&s->dma_dac.wait, &wait);
	while (count > 0) {
		spin_lock_irqsave(&s->lock, flags);
		if (s->dma_dac.count < 0) {
			s->dma_dac.count = 0;
			s->dma_dac.swptr = s->dma_dac.hwptr;
		}
		swptr = s->dma_dac.swptr;
		cnt = s->dma_dac.dmasize-swptr;
		if (s->dma_dac.count + cnt > s->dma_dac.dmasize)
			cnt = s->dma_dac.dmasize - s->dma_dac.count;
		if (cnt <= 0)
			__set_current_state(TASK_INTERRUPTIBLE);
		spin_unlock_irqrestore(&s->lock, flags);
		if (cnt > count)
			cnt = count;
		if (cnt <= 0) {
			if (s->dma_dac.enabled)
				start_dac(s);
			if (file->f_flags & O_NONBLOCK) {
				if (!ret)
					ret = -EAGAIN;
				break;
			}
			if (!schedule_timeout(HZ)) {
				printk(KERN_DEBUG "sv: write: chip lockup? dmasz %u fragsz %u count %i hwptr %u swptr %u\n",
				       s->dma_dac.dmasize, s->dma_dac.fragsize, s->dma_dac.count, 
				       s->dma_dac.hwptr, s->dma_dac.swptr);
				stop_dac(s);
				spin_lock_irqsave(&s->lock, flags);
				set_dmaa(s, virt_to_bus(s->dma_dac.rawbuf), s->dma_dac.numfrag << s->dma_dac.fragshift);
				/* program enhanced mode registers */
				wrindir(s, SV_CIDMAABASECOUNT1, (s->dma_dac.fragsamples-1) >> 8);
				wrindir(s, SV_CIDMAABASECOUNT0, s->dma_dac.fragsamples-1);
				s->dma_dac.count = s->dma_dac.hwptr = s->dma_dac.swptr = 0;
				spin_unlock_irqrestore(&s->lock, flags);
			}
			if (signal_pending(current)) {
				if (!ret)
					ret = -ERESTARTSYS;
				break;
			}
			continue;
		}
		if (copy_from_user(s->dma_dac.rawbuf + swptr, buffer, cnt)) {
			if (!ret)
				ret = -EFAULT;
			break;
		}
		swptr = (swptr + cnt) % s->dma_dac.dmasize;
		spin_lock_irqsave(&s->lock, flags);
		s->dma_dac.swptr = swptr;
		s->dma_dac.count += cnt;
		s->dma_dac.endcleared = 0;
		spin_unlock_irqrestore(&s->lock, flags);
		count -= cnt;
		buffer += cnt;
		ret += cnt;
		if (s->dma_dac.enabled)
			start_dac(s);
	}
        remove_wait_queue(&s->dma_dac.wait, &wait);
	set_current_state(TASK_RUNNING);
	return ret;
}

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

	VALIDATE_STATE(s);
	if (file->f_mode & FMODE_WRITE) {
		if (!s->dma_dac.ready && prog_dmabuf(s, 1))
			return 0;
		poll_wait(file, &s->dma_dac.wait, wait);
	}
	if (file->f_mode & FMODE_READ) {
		if (!s->dma_adc.ready && prog_dmabuf(s, 0))
			return 0;
		poll_wait(file, &s->dma_adc.wait, wait);
	}
	spin_lock_irqsave(&s->lock, flags);
	sv_update_ptr(s);
	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 (s->dma_dac.mapped) {
			if (s->dma_dac.count >= (signed)s->dma_dac.fragsize) 
				mask |= POLLOUT | POLLWRNORM;
		} else {
			if ((signed)s->dma_dac.dmasize >= s->dma_dac.count + (signed)s->dma_dac.fragsize)
				mask |= POLLOUT | POLLWRNORM;
		}
	}
	spin_unlock_irqrestore(&s->lock, flags);
	return mask;
}

static int sv_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct sv_state *s = (struct sv_state *)file->private_data;
	struct dmabuf *db;
	int ret = -EINVAL;
	unsigned long size;

	VALIDATE_STATE(s);
	lock_kernel();
	if (vma->vm_flags & VM_WRITE) {
		if ((ret = prog_dmabuf(s, 1)) != 0)
			goto out;
		db = &s->dma_dac;
	} else if (vma->vm_flags & VM_READ) {
		if ((ret = prog_dmabuf(s, 0)) != 0)
			goto out;
		db = &s->dma_adc;
	} else 
		goto out;
	ret = -EINVAL;
	if (vma->vm_pgoff != 0)
		goto out;
	size = vma->vm_end - vma->vm_start;
	if (size > (PAGE_SIZE << db->buforder))
		goto out;
	ret = -EAGAIN;
	if (remap_page_range(vma->vm_start, virt_to_phys(db->rawbuf), size, vma->vm_page_prot))
		goto out;
	db->mapped = 1;
	ret = 0;
out:
	unlock_kernel();
	return ret;
}

static int sv_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
	struct sv_state *s = (struct sv_state *)file->private_data;
	unsigned long flags;
        audio_buf_info abinfo;
        count_info cinfo;
	int count;
	int val, mapped, ret;
	unsigned char fmtm, fmtd;

	VALIDATE_STATE(s);
        mapped = ((file->f_mode & FMODE_WRITE) && s->dma_dac.mapped) ||
		((file->f_mode & FMODE_READ) && s->dma_adc.mapped);
	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, 0/*file->f_flags & O_NONBLOCK*/);
		return 0;
		
	case SNDCTL_DSP_SETDUPLEX:
		return 0;

	case SNDCTL_DSP_GETCAPS:
		return put_user(DSP_CAP_DUPLEX | DSP_CAP_REALTIME | DSP_CAP_TRIGGER | DSP_CAP_MMAP, (int *)arg);
		
        case SNDCTL_DSP_RESET:
		if (file->f_mode & FMODE_WRITE) {
			stop_dac(s);
			synchronize_irq();
			s->dma_dac.swptr = s->dma_dac.hwptr = s->dma_dac.count = s->dma_dac.total_bytes = 0;
		}
		if (file->f_mode & FMODE_READ) {
			stop_adc(s);
			synchronize_irq();
			s->dma_adc.swptr = s->dma_adc.hwptr = s->dma_adc.count = s->dma_adc.total_bytes = 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);
				s->dma_adc.ready = 0;
				set_adc_rate(s, val);
			}
			if (file->f_mode & FMODE_WRITE) {
				stop_dac(s);
				s->dma_dac.ready = 0;
				set_dac_rate(s, val);
			}
		}
		return put_user((file->f_mode & FMODE_READ) ? s->rateadc : s->ratedac, (int *)arg);
		
        case SNDCTL_DSP_STEREO:
                if (get_user(val, (int *)arg))
			return -EFAULT;
		fmtd = 0;
		fmtm = ~0;
		if (file->f_mode & FMODE_READ) {
			stop_adc(s);
			s->dma_adc.ready = 0;
			if (val)
				fmtd |= SV_CFMT_STEREO << SV_CFMT_CSHIFT;
			else
				fmtm &= ~(SV_CFMT_STEREO << SV_CFMT_CSHIFT);
		}
		if (file->f_mode & FMODE_WRITE) {
			stop_dac(s);
			s->dma_dac.ready = 0;
			if (val)
				fmtd |= SV_CFMT_STEREO << SV_CFMT_ASHIFT;
			else
				fmtm &= ~(SV_CFMT_STEREO << SV_CFMT_ASHIFT);
		}
		set_fmt(s, fmtm, fmtd);
		return 0;

        case SNDCTL_DSP_CHANNELS:
                if (get_user(val, (int *)arg))
			return -EFAULT;
		if (val != 0) {
			fmtd = 0;
			fmtm = ~0;
			if (file->f_mode & FMODE_READ) {
				stop_adc(s);
				s->dma_adc.ready = 0;
				if (val >= 2)
					fmtd |= SV_CFMT_STEREO << SV_CFMT_CSHIFT;
				else
					fmtm &= ~(SV_CFMT_STEREO << SV_CFMT_CSHIFT);
			}
			if (file->f_mode & FMODE_WRITE) {
				stop_dac(s);
				s->dma_dac.ready = 0;
				if (val >= 2)
					fmtd |= SV_CFMT_STEREO << SV_CFMT_ASHIFT;
				else
					fmtm &= ~(SV_CFMT_STEREO << SV_CFMT_ASHIFT);
			}
			set_fmt(s, fmtm, fmtd);
		}
		return put_user((s->fmt & ((file->f_mode & FMODE_READ) ? (SV_CFMT_STEREO << SV_CFMT_CSHIFT) 
					   : (SV_CFMT_STEREO << SV_CFMT_ASHIFT))) ? 2 : 1, (int *)arg);
		
	case SNDCTL_DSP_GETFMTS: /* Returns a mask */
                return put_user(AFMT_S16_LE|AFMT_U8, (int *)arg);
		
	case SNDCTL_DSP_SETFMT: /* Selects ONE fmt*/
		if (get_user(val, (int *)arg))
			return -EFAULT;
		if (val != AFMT_QUERY) {
			fmtd = 0;
			fmtm = ~0;
			if (file->f_mode & FMODE_READ) {
				stop_adc(s);
				s->dma_adc.ready = 0;
				if (val == AFMT_S16_LE)
					fmtd |= SV_CFMT_16BIT << SV_CFMT_CSHIFT;
				else
					fmtm &= ~(SV_CFMT_16BIT << SV_CFMT_CSHIFT);
			}
			if (file->f_mode & FMODE_WRITE) {
				stop_dac(s);
				s->dma_dac.ready = 0;
				if (val == AFMT_S16_LE)
					fmtd |= SV_CFMT_16BIT << SV_CFMT_ASHIFT;
				else
					fmtm &= ~(SV_CFMT_16BIT << SV_CFMT_ASHIFT);
			}
			set_fmt(s, fmtm, fmtd);
		}
		return put_user((s->fmt & ((file->f_mode & FMODE_READ) ? (SV_CFMT_16BIT << SV_CFMT_CSHIFT) 
					   : (SV_CFMT_16BIT << SV_CFMT_ASHIFT))) ? AFMT_S16_LE : AFMT_U8, (int *)arg);
		
	case SNDCTL_DSP_POST:
                return 0;

        case SNDCTL_DSP_GETTRIGGER:
		val = 0;
		if (file->f_mode & FMODE_READ && s->enable & SV_CENABLE_RE) 
			val |= PCM_ENABLE_INPUT;
		if (file->f_mode & FMODE_WRITE && s->enable & SV_CENABLE_PE) 
			val |= PCM_ENABLE_OUTPUT;
		return put_user(val, (int *)arg);
		
	case SNDCTL_DSP_SETTRIGGER:
		if (get_user(val, (int *)arg))
			return -EFAULT;
		if (file->f_mode & FMODE_READ) {
			if (val & PCM_ENABLE_INPUT) {
				if (!s->dma_adc.ready && (ret =  prog_dmabuf(s, 1)))
					return ret;
				s->dma_adc.enabled = 1;
				start_adc(s);
			} else {
				s->dma_adc.enabled = 0;
				stop_adc(s);
			}
		}
		if (file->f_mode & FMODE_WRITE) {
			if (val & PCM_ENABLE_OUTPUT) {
				if (!s->dma_dac.ready && (ret = prog_dmabuf(s, 0)))
					return ret;
				s->dma_dac.enabled = 1;
				start_dac(s);
			} else {
				s->dma_dac.enabled = 0;
				stop_dac(s);
			}
		}
		return 0;

	case SNDCTL_DSP_GETOSPACE:
		if (!(file->f_mode & FMODE_WRITE))
			return -EINVAL;
		if (!s->dma_dac.ready && (val = prog_dmabuf(s, 0)) != 0)
			return val;
		spin_lock_irqsave(&s->lock, flags);
		sv_update_ptr(s);
		abinfo.fragsize = s->dma_dac.fragsize;
		count = s->dma_dac.count;
		if (count < 0)
			count = 0;
                abinfo.bytes = s->dma_dac.dmasize - count;
                abinfo.fragstotal = s->dma_dac.numfrag;
                abinfo.fragments = abinfo.bytes >> s->dma_dac.fragshift;      
		spin_unlock_irqrestore(&s->lock, flags);
		return copy_to_user((void *)arg, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;

	case SNDCTL_DSP_GETISPACE:
		if (!(file->f_mode & FMODE_READ))
			return -EINVAL;
		if (!s->dma_adc.ready && (val = prog_dmabuf(s, 1)) != 0)
			return val;
		spin_lock_irqsave(&s->lock, flags);
		sv_update_ptr(s);
		abinfo.fragsize = s->dma_adc.fragsize;
		count = s->dma_adc.count;
		if (count < 0)
			count = 0;
                abinfo.bytes = count;
                abinfo.fragstotal = s->dma_adc.numfrag;
                abinfo.fragments = abinfo.bytes >> s->dma_adc.fragshift;      
		spin_unlock_irqrestore(&s->lock, flags);
		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;
		if (!s->dma_dac.ready && (val = prog_dmabuf(s, 0)) != 0)
			return val;
		spin_lock_irqsave(&s->lock, flags);
		sv_update_ptr(s);
                count = s->dma_dac.count;
		spin_unlock_irqrestore(&s->lock, flags);
		if (count < 0)
			count = 0;
		return put_user(count, (int *)arg);

        case SNDCTL_DSP_GETIPTR:
		if (!(file->f_mode & FMODE_READ))
			return -EINVAL;
		if (!s->dma_adc.ready && (val = prog_dmabuf(s, 1)) != 0)
			return val;
		spin_lock_irqsave(&s->lock, flags);
		sv_update_ptr(s);
                cinfo.bytes = s->dma_adc.total_bytes;
		count = s->dma_adc.count;
		if (count < 0)
			count = 0;
                cinfo.blocks = count >> s->dma_adc.fragshift;
                cinfo.ptr = s->dma_adc.hwptr;
		if (s->dma_adc.mapped)
			s->dma_adc.count &= s->dma_adc.fragsize-1;
		spin_unlock_irqrestore(&s->lock, flags);
                return copy_to_user((void *)arg, &cinfo, sizeof(cinfo));

        case SNDCTL_DSP_GETOPTR:
		if (!(file->f_mode & FMODE_WRITE))
			return -EINVAL;
		if (!s->dma_dac.ready && (val = prog_dmabuf(s, 0)) != 0)
			return val;
		spin_lock_irqsave(&s->lock, flags);
		sv_update_ptr(s);
                cinfo.bytes = s->dma_dac.total_bytes;
		count = s->dma_dac.count;
		if (count < 0)