audio.c

鼎力推荐！本程序是基于嵌入式LUNUX系统开发的源程序代码

						     wave_dev->card->pt.enable_gpr_name) >= 0)
				val |= AFMT_AC3;
		}
		return put_user(val, p);

	case SNDCTL_DSP_SETFMT:	/* Same as SNDCTL_DSP_SAMPLESIZE */
		DPF(2, "SNDCTL_DSP_SETFMT:\n");

		if (get_user(val, p))
			return -EFAULT;

		DPD(2, " val is %d\n", val);

		if (val != AFMT_QUERY) {
			if (file->f_mode & FMODE_READ) {
				struct wave_format format;

				spin_lock_irqsave(&wiinst->lock, flags);

				format = wiinst->format;
				format.id = val;

				if (emu10k1_wavein_setformat(wave_dev, &format) < 0) {
					spin_unlock_irqrestore(&wiinst->lock, flags);
					return -EINVAL;
				}

				val = wiinst->format.id;

				spin_unlock_irqrestore(&wiinst->lock, flags);
				DPD(2, "set recording format -> %d\n", val);
			}

			if (file->f_mode & FMODE_WRITE) {
				struct wave_format format;

				spin_lock_irqsave(&woinst->lock, flags);

				format = woinst->format;
				format.id = val;

				if (emu10k1_waveout_setformat(wave_dev, &format) < 0) {
					spin_unlock_irqrestore(&woinst->lock, flags);
					return -EINVAL;
				}

				val = woinst->format.id;

				spin_unlock_irqrestore(&woinst->lock, flags);
				DPD(2, "set playback format -> %d\n", val);
			}

			return put_user(val, p);
		} else {
			if (file->f_mode & FMODE_READ)
				val = wiinst->format.id;
			else if (file->f_mode & FMODE_WRITE)
				val = woinst->format.id;

			return put_user(val, p);
		}
		break;

	case SOUND_PCM_READ_BITS:

		if (file->f_mode & FMODE_READ)
			val = wiinst->format.bitsperchannel;
		else if (file->f_mode & FMODE_WRITE)
			val = woinst->format.bitsperchannel;

		return put_user(val, p);

	case SOUND_PCM_READ_RATE:

		if (file->f_mode & FMODE_READ)
			val = wiinst->format.samplingrate;
		else if (file->f_mode & FMODE_WRITE)
			val = woinst->format.samplingrate;

		return put_user(val, p);

	case SOUND_PCM_READ_CHANNELS:

		if (file->f_mode & FMODE_READ)
			val = wiinst->format.channels;
		else if (file->f_mode & FMODE_WRITE)
			val = woinst->format.channels;

		return put_user(val, p);

	case SOUND_PCM_WRITE_FILTER:
		DPF(2, "SOUND_PCM_WRITE_FILTER: not implemented\n");
		break;

	case SOUND_PCM_READ_FILTER:
		DPF(2, "SOUND_PCM_READ_FILTER: not implemented\n");
		break;

	case SNDCTL_DSP_SETSYNCRO:
		DPF(2, "SNDCTL_DSP_SETSYNCRO: not implemented\n");
		break;

	case SNDCTL_DSP_GETTRIGGER:
		DPF(2, "SNDCTL_DSP_GETTRIGGER:\n");

		if (file->f_mode & FMODE_WRITE && (wave_dev->enablebits & PCM_ENABLE_OUTPUT))
			val |= PCM_ENABLE_OUTPUT;

		if (file->f_mode & FMODE_READ && (wave_dev->enablebits & PCM_ENABLE_INPUT))
			val |= PCM_ENABLE_INPUT;

		return put_user(val, p);

	case SNDCTL_DSP_SETTRIGGER:
		DPF(2, "SNDCTL_DSP_SETTRIGGER:\n");

		if (get_user(val, p))
			return -EFAULT;

		if (file->f_mode & FMODE_WRITE) {
			spin_lock_irqsave(&woinst->lock, flags);

			if (val & PCM_ENABLE_OUTPUT) {
				wave_dev->enablebits |= PCM_ENABLE_OUTPUT;
				if (woinst->state & WAVE_STATE_OPEN)
					emu10k1_waveout_start(wave_dev);
			} else {
				wave_dev->enablebits &= ~PCM_ENABLE_OUTPUT;
				if (woinst->state & WAVE_STATE_STARTED)
					emu10k1_waveout_stop(wave_dev);
			}

			spin_unlock_irqrestore(&woinst->lock, flags);
		}

		if (file->f_mode & FMODE_READ) {
			spin_lock_irqsave(&wiinst->lock, flags);

			if (val & PCM_ENABLE_INPUT) {
				wave_dev->enablebits |= PCM_ENABLE_INPUT;
				if (wiinst->state & WAVE_STATE_OPEN)
					emu10k1_wavein_start(wave_dev);
			} else {
				wave_dev->enablebits &= ~PCM_ENABLE_INPUT;
				if (wiinst->state & WAVE_STATE_STARTED)
					emu10k1_wavein_stop(wave_dev);
			}

			spin_unlock_irqrestore(&wiinst->lock, flags);
		}
		break;

	case SNDCTL_DSP_GETOSPACE:
		{
			audio_buf_info info;

			DPF(4, "SNDCTL_DSP_GETOSPACE:\n");

			if (!(file->f_mode & FMODE_WRITE))
				return -EINVAL;

			spin_lock_irqsave(&woinst->lock, flags);

			if (woinst->state & WAVE_STATE_OPEN) {
				emu10k1_waveout_update(woinst);
				emu10k1_waveout_getxfersize(woinst, &bytestocopy);
				info.bytes = bytestocopy;
			} else {
				calculate_ofrag(woinst);
				info.bytes = woinst->buffer.size;
			}
			spin_unlock_irqrestore(&woinst->lock, flags);

			info.bytes *= woinst->num_voices;
			info.fragsize = woinst->buffer.fragment_size * woinst->num_voices;
			info.fragstotal = woinst->buffer.numfrags * woinst->num_voices;
			info.fragments = info.bytes / info.fragsize;

			if (copy_to_user(p, &info, sizeof(info)))
				return -EFAULT;
		}
		break;

	case SNDCTL_DSP_GETISPACE:
		{
			audio_buf_info info;

			DPF(4, "SNDCTL_DSP_GETISPACE:\n");

			if (!(file->f_mode & FMODE_READ))
				return -EINVAL;

			spin_lock_irqsave(&wiinst->lock, flags);
			if (wiinst->state & WAVE_STATE_OPEN) {
				emu10k1_wavein_update(wave_dev->card, wiinst);
				emu10k1_wavein_getxfersize(wiinst, &bytestocopy);
				info.bytes = bytestocopy;
			} else {
				calculate_ifrag(wiinst);
				info.bytes = 0;
			}
			spin_unlock_irqrestore(&wiinst->lock, flags);

			info.fragstotal = wiinst->buffer.numfrags;
			info.fragments = info.bytes / wiinst->buffer.fragment_size;
			info.fragsize = wiinst->buffer.fragment_size;

			if (copy_to_user(p, &info, sizeof(info)))
				return -EFAULT;
		}
		break;

	case SNDCTL_DSP_NONBLOCK:
		DPF(2, "SNDCTL_DSP_NONBLOCK:\n");

		file->f_flags |= O_NONBLOCK;
		break;

	case SNDCTL_DSP_GETODELAY:
		DPF(4, "SNDCTL_DSP_GETODELAY:\n");

		if (!(file->f_mode & FMODE_WRITE))
			return -EINVAL;

		spin_lock_irqsave(&woinst->lock, flags);
		if (woinst->state & WAVE_STATE_OPEN) {
			emu10k1_waveout_update(woinst);
			emu10k1_waveout_getxfersize(woinst, &bytestocopy);
			val = woinst->buffer.size - bytestocopy;
		} else
			val = 0;

		val *= woinst->num_voices;
		spin_unlock_irqrestore(&woinst->lock, flags);

		return put_user(val, p);

	case SNDCTL_DSP_GETIPTR:
		{
			count_info cinfo;

			DPF(4, "SNDCTL_DSP_GETIPTR: \n");

			if (!(file->f_mode & FMODE_READ))
				return -EINVAL;

			spin_lock_irqsave(&wiinst->lock, flags);

			if (wiinst->state & WAVE_STATE_OPEN) {
				emu10k1_wavein_update(wave_dev->card, wiinst);
				cinfo.ptr = wiinst->buffer.hw_pos;
				cinfo.bytes = cinfo.ptr + wiinst->total_recorded - wiinst->total_recorded % wiinst->buffer.size;
				cinfo.blocks = cinfo.bytes / wiinst->buffer.fragment_size - wiinst->blocks;
				wiinst->blocks = cinfo.bytes / wiinst->buffer.fragment_size;
			} else {
				cinfo.ptr = 0;
				cinfo.bytes = 0;
				cinfo.blocks = 0;
			}

			if (wiinst->mmapped)
				wiinst->buffer.bytestocopy %= wiinst->buffer.fragment_size;

			spin_unlock_irqrestore(&wiinst->lock, flags);

			if (copy_to_user(p, &cinfo, sizeof(cinfo)))
				return -EFAULT;
		}
		break;

	case SNDCTL_DSP_GETOPTR:
		{
			count_info cinfo;

			DPF(4, "SNDCTL_DSP_GETOPTR:\n");

			if (!(file->f_mode & FMODE_WRITE))
				return -EINVAL;

			spin_lock_irqsave(&woinst->lock, flags);

			if (woinst->state & WAVE_STATE_OPEN || 
			    ((woinst->format.passthrough == 1) && wave_dev->card->pt.state)) {
				int num_fragments;

				if (woinst->format.passthrough == 1) {
					emu10k1_pt_waveout_update(wave_dev);
					cinfo.bytes = woinst->total_played;
				} else {
					emu10k1_waveout_update(woinst);
					cinfo.bytes = woinst->total_played;
				}

				cinfo.ptr = woinst->buffer.hw_pos;
				num_fragments = cinfo.bytes / woinst->buffer.fragment_size;
				cinfo.blocks = num_fragments - woinst->blocks;
				woinst->blocks = num_fragments;

				cinfo.bytes *= woinst->num_voices;
				cinfo.ptr *= woinst->num_voices;
			} else {
				cinfo.ptr = 0;
				cinfo.bytes = 0;
				cinfo.blocks = 0;
			}

			if (woinst->mmapped)
				woinst->buffer.free_bytes %= woinst->buffer.fragment_size;

			spin_unlock_irqrestore(&woinst->lock, flags);

			if (copy_to_user(p, &cinfo, sizeof(cinfo)))
				return -EFAULT;
		}
		break;

	case SNDCTL_DSP_GETBLKSIZE:
		DPF(2, "SNDCTL_DSP_GETBLKSIZE:\n");

		if (file->f_mode & FMODE_WRITE) {
			spin_lock_irqsave(&woinst->lock, flags);

			calculate_ofrag(woinst);
			val = woinst->buffer.fragment_size * woinst->num_voices;

			spin_unlock_irqrestore(&woinst->lock, flags);
		}

		if (file->f_mode & FMODE_READ) {
			spin_lock_irqsave(&wiinst->lock, flags);

			calculate_ifrag(wiinst);
			val = wiinst->buffer.fragment_size;

			spin_unlock_irqrestore(&wiinst->lock, flags);
		}

		return put_user(val, p);

		break;

	case SNDCTL_DSP_POST:
		if (file->f_mode & FMODE_WRITE) {
			spin_lock_irqsave(&woinst->lock, flags);

			if (!(woinst->state & WAVE_STATE_STARTED)
			    && (wave_dev->enablebits & PCM_ENABLE_OUTPUT)
			    && (woinst->total_copied > 0))
				emu10k1_waveout_start(wave_dev);

			spin_unlock_irqrestore(&woinst->lock, flags);
		}

		break;

	case SNDCTL_DSP_SUBDIVIDE:
		DPF(2, "SNDCTL_DSP_SUBDIVIDE: not implemented\n");
		break;

	case SNDCTL_DSP_SETFRAGMENT:
		DPF(2, "SNDCTL_DSP_SETFRAGMENT:\n");

		if (get_user(val, p))
			return -EFAULT;

		DPD(2, "val is %#x\n", val);

		if (val == 0)
			return -EIO;

		if (file->f_mode & FMODE_WRITE) {
			/* digital pass-through fragment count and size are fixed values */
			if (woinst->state & WAVE_STATE_OPEN || (woinst->format.passthrough == 1))
				return -EINVAL;	/* too late to change */

			woinst->buffer.ossfragshift = val & 0xffff;
			woinst->buffer.numfrags = (val >> 16) & 0xffff;
		}

		if (file->f_mode & FMODE_READ) {
			if (wiinst->state & WAVE_STATE_OPEN)
				return -EINVAL;	/* too late to change */

			wiinst->buffer.ossfragshift = val & 0xffff;
			wiinst->buffer.numfrags = (val >> 16) & 0xffff;
		}

		break;

	case SNDCTL_COPR_LOAD:
		{
			copr_buffer *buf;
			u32 i;

			DPF(4, "SNDCTL_COPR_LOAD:\n");

			buf = kmalloc(sizeof(copr_buffer), GFP_KERNEL);
			if (!buf)
				return -ENOMEM;

			if (copy_from_user(buf, p, sizeof(copr_buffer))) {
				kfree (buf);
				return -EFAULT;
			}

			if ((buf->command != CMD_READ) && (buf->command != CMD_WRITE)) {
				kfree (buf);
				return -EINVAL;
			}

			if (buf->command == CMD_WRITE) {
				
#ifdef DBGEMU
				if ((buf->offs < 0) || (buf->offs + buf->len > 0xe00) || (buf->len > 1000)) {
#else
				if (((buf->offs < 0x100) || (buf->offs + buf->len > (wave_dev->card->is_audigy ? 0xe00 : 0x800)) || (buf->len > 1000)
				) && !(
					//any register allowed raw access to users goes here:
					(buf->offs == DBG ||
					  buf->offs == A_DBG)
					&& (buf->len == 1))) {
#endif		
					kfree(buf);
					return -EINVAL;
				}
			} else {
				if ((buf->offs < 0) || (buf->offs + buf->len > 0xe00) || (buf->len > 1000)) {
					kfree(buf);
					return -EINVAL;
				}
			}			
				
			if (((unsigned)buf->flags) > 0x3f)
				buf->flags = 0;

			if (buf->command == CMD_READ) {
				for (i = 0; i < buf->len; i++)
					((u32 *) buf->data)[i] = sblive_readptr(wave_dev->card, buf->offs + i, buf->flags);

				if (copy_to_user(p, buf, sizeof(copr_buffer))) {
					kfree(buf);
					return -EFAULT;
				}
			} else {
				for (i = 0; i < buf->len; i++)
					sblive_writeptr(wave_dev->card, buf->offs + i, buf->flags, ((u32 *) buf->data)[i]);
			}

			kfree (buf);
			break;
		}

	default:		/* Default is unrecognized command */
		DPD(2, "default: %#x\n", cmd);
		return -EINVAL;
	}
	return 0;
}

static struct page *emu10k1_mm_nopage (struct vm_area_struct * vma, unsigned long address, int *type)
{
	struct emu10k1_wavedevice *wave_dev = vma->vm_private_data;
	struct woinst *woinst = wave_dev->woinst;
	struct wiinst *wiinst = wave_dev->wiinst;
	struct page *dmapage;
	unsigned long pgoff;
	int rd, wr;

	DPF(3, "emu10k1_mm_nopage()\n");
	DPD(3, "addr: %#lx\n", address);

	if (address > vma->vm_end) {
		DPF(1, "EXIT, returning NOPAGE_SIGBUS\n");
		return NOPAGE_SIGBUS; /* Disallow mremap */
	}

	pgoff = vma->vm_pgoff + ((address - vma->vm_start) >> PAGE_SHIFT);
	if (woinst != NULL)
		wr = woinst->mmapped;
	else
		wr = 0;

	if (wiinst != NULL)
		rd = wiinst->mmapped;
	else
		rd = 0;

	/* if full-duplex (read+write) and we have two sets of bufs,
	* then the playback buffers come first, sez soundcard.c */
	if (wr) {
		if (pgoff >= woinst->buffer.pages) {
			pgoff -= woinst->buffer.pages;
			dmapage = virt_to_page ((u8 *) wiinst->buffer.addr + pgoff * PAGE_SIZE);
		} else
			dmapage = virt_to_page (woinst->voice[0].mem.addr[pgoff]);
	} else {
		dmapage = virt_to_page ((u8 *) wiinst->buffer.addr + pgoff * PAGE_SIZE);
	}

	get_page (dmapage);

	DPD(3, "page: %#lx\n", (unsigned long) dmapage);
	if (type)
		*type = VM_FAULT_MINOR;
	return dmapage;
}

static struct vm_operations_struct emu10k1_mm_ops = {
	.nopage         = emu10k1_mm_nopage,
};

static int emu10k1_audio_mmap(struct file *file, struct vm_area_struct *vma)
{
	struct emu10k1_wavedevice *wave_dev = (struct emu10k1_wavedevice *) file->private_data;
	unsigned long max_pages, n_pages, pgoffset;
	struct woinst *woinst = NULL;
	struct wiinst *wiinst = NULL;
	unsigned long flags;

	DPF(2, "emu10k1_audio_mmap()\n");

	max_pages = 0;
	if (vma->vm_flags & VM_WRITE) {
		woinst = wave_dev->woinst;

		spin_lock_irqsave(&woinst->lock, flags);

		/* No m'mapping possible for multichannel */
		if (woinst->num_voices > 1) {
			spin_unlock_irqrestore(&woinst->lock, flags);