text: /*
   **********************************************************************
   *     cardwi.c - PCM input HAL for emu10k1 driver
   *     Copyright 1999, 2000 Creative Labs, Inc.
   *
   **********************************************************************
   *
   *     Date                 Author          Summary of changes
   *     ----                 ------          ------------------
   *     October 20, 1999     Bertrand Lee    base code release
   *
   **********************************************************************
   *
   *     This program is free software; you can redistribute it and/or
   *     modify it under the terms of the GNU General Public License as
   *     published by the Free Software Foundation; either version 2 of
   *     the License, or (at your option) any later version.
   *
   *     This program is distributed in the hope that it will be useful,
   *     but WITHOUT ANY WARRANTY; without even the implied warranty of
   *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *     GNU General Public License for more details.
   *
   *     You should have received a copy of the GNU General Public
   *     License along with this program; if not, write to the Free
   *     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
   *     USA.
   *
   **********************************************************************
   */
  
  #include <linux/poll.h>
  #include "hwaccess.h"
  #include "timer.h"
  #include "recmgr.h"
  #include "audio.h"
  #include "cardwi.h"
  
  /**
   * query_format - returns a valid sound format
   *
   * This function will return a valid sound format as close
   * to the requested one as possible. 
   */
  static void query_format(int recsrc, struct wave_format *wave_fmt)
  {
  
  	switch (recsrc) {
  	case WAVERECORD_AC97:
  
  		if ((wave_fmt->channels != 1) && (wave_fmt->channels != 2))
  			wave_fmt->channels = 2;
  
  		if (wave_fmt->samplingrate >= (0xBB80 + 0xAC44) / 2)
  			wave_fmt->samplingrate = 0xBB80;
  		else if (wave_fmt->samplingrate >= (0xAC44 + 0x7D00) / 2)
  			wave_fmt->samplingrate = 0xAC44;
  		else if (wave_fmt->samplingrate >= (0x7D00 + 0x5DC0) / 2)
  			wave_fmt->samplingrate = 0x7D00;
  		else if (wave_fmt->samplingrate >= (0x5DC0 + 0x5622) / 2)
  			wave_fmt->samplingrate = 0x5DC0;
  		else if (wave_fmt->samplingrate >= (0x5622 + 0x3E80) / 2)
  			wave_fmt->samplingrate = 0x5622;
  		else if (wave_fmt->samplingrate >= (0x3E80 + 0x2B11) / 2)
  			wave_fmt->samplingrate = 0x3E80;
  		else if (wave_fmt->samplingrate >= (0x2B11 + 0x1F40) / 2)
  			wave_fmt->samplingrate = 0x2B11;
  		else
  			wave_fmt->samplingrate = 0x1F40;
  
  		switch (wave_fmt->id) {
  		case AFMT_S16_LE:
  			wave_fmt->bitsperchannel = 16;
  			break;
  		case AFMT_U8:
  			wave_fmt->bitsperchannel = 8;
  			break;
  		default:
  			wave_fmt->id = AFMT_S16_LE;
  			wave_fmt->bitsperchannel = 16;
  			break;
  		}
  
  		break;
  
  	/* these can't be changed from the original values */
  	case WAVERECORD_MIC:
  	case WAVERECORD_FX:
  		break;
  
  	default:
  		BUG();
  		break;
  	}
  
  	wave_fmt->bytesperchannel = wave_fmt->bitsperchannel >> 3;
  	wave_fmt->bytespersample = wave_fmt->channels * wave_fmt->bytesperchannel;
  	wave_fmt->bytespersec = wave_fmt->bytespersample * wave_fmt->samplingrate;
  	wave_fmt->bytespervoicesample = wave_fmt->bytespersample;
  }
  
  static int alloc_buffer(struct emu10k1_card *card, struct wavein_buffer *buffer)
  {
  	buffer->addr = pci_alloc_consistent(card->pci_dev, buffer->size * buffer->cov,
  					    &buffer->dma_handle);
  	if (buffer->addr == NULL)
  		return -1;
  
  	return 0;
  }
  
  static void free_buffer(struct emu10k1_card *card, struct wavein_buffer *buffer)
  {
  	if (buffer->addr != NULL)
  		pci_free_consistent(card->pci_dev, buffer->size * buffer->cov,
  				    buffer->addr, buffer->dma_handle);
  }
  
  int emu10k1_wavein_open(struct emu10k1_wavedevice *wave_dev)
  {
  	struct emu10k1_card *card = wave_dev->card;
  	struct wiinst *wiinst = wave_dev->wiinst;
  	struct wiinst **wiinst_tmp = NULL;
  	u16 delay;
  	unsigned long flags;
  
  	DPF(2, "emu10k1_wavein_open()\n");
  
  	switch (wiinst->recsrc) {
  	case WAVERECORD_AC97:
  		wiinst_tmp = &card->wavein.ac97;
  		break;
  	case WAVERECORD_MIC:
  		wiinst_tmp = &card->wavein.mic;
  		break;
  	case WAVERECORD_FX:
  		wiinst_tmp = &card->wavein.fx;
  		break;
  	default:
  		BUG();
  		break;
  	}
  
  	spin_lock_irqsave(&card->lock, flags);
  	if (*wiinst_tmp != NULL) {
  		spin_unlock_irqrestore(&card->lock, flags);
  		return -1;
  	}
  
  	*wiinst_tmp = wiinst;
  	spin_unlock_irqrestore(&card->lock, flags);
  
  	/* handle 8 bit recording */
  	if (wiinst->format.bytesperchannel == 1) {
  		if (wiinst->buffer.size > 0x8000) {
  			wiinst->buffer.size = 0x8000;
  			wiinst->buffer.sizeregval = 0x1f;
  		} else
  			wiinst->buffer.sizeregval += 4;
  
  		wiinst->buffer.cov = 2;
  	} else
  		wiinst->buffer.cov = 1;
  
  	if (alloc_buffer(card, &wiinst->buffer) < 0) {
  		ERROR();
  		return -1;
  	}
  
  	emu10k1_set_record_src(card, wiinst);
  
  	emu10k1_reset_record(card, &wiinst->buffer);
  
  	wiinst->buffer.hw_pos = 0;
  	wiinst->buffer.pos = 0;
  	wiinst->buffer.bytestocopy = 0;
  
  	delay = (48000 * wiinst->buffer.fragment_size) / wiinst->format.bytespersec;
  
  	emu10k1_timer_install(card, &wiinst->timer, delay / 2);
  
  	wiinst->state = WAVE_STATE_OPEN;
  
  	return 0;
  }
  
  void emu10k1_wavein_close(struct emu10k1_wavedevice *wave_dev)
  {
  	struct emu10k1_card *card = wave_dev->card;
  	struct wiinst *wiinst = wave_dev->wiinst;
  	unsigned long flags;
  
  	DPF(2, "emu10k1_wavein_close()\n");
  
  	emu10k1_wavein_stop(wave_dev);
  
  	emu10k1_timer_uninstall(card, &wiinst->timer);
  
  	free_buffer(card, &wiinst->buffer);
  
  	spin_lock_irqsave(&card->lock, flags);
  	switch (wave_dev->wiinst->recsrc) {
  	case WAVERECORD_AC97:
  		card->wavein.ac97 = NULL;
  		break;
  	case WAVERECORD_MIC:
  		card->wavein.mic = NULL;
  		break;
  	case WAVERECORD_FX:
  		card->wavein.fx = NULL;
  		break;
  	default:
  		BUG();
  		break;
  	}
  	spin_unlock_irqrestore(&card->lock, flags);
  
  	wiinst->state = WAVE_STATE_CLOSED;
  }
  
  void emu10k1_wavein_start(struct emu10k1_wavedevice *wave_dev)
  {
  	struct emu10k1_card *card = wave_dev->card;
  	struct wiinst *wiinst = wave_dev->wiinst;
  
  	DPF(2, "emu10k1_wavein_start()\n");
  
  	emu10k1_start_record(card, &wiinst->buffer);
  	emu10k1_timer_enable(wave_dev->card, &wiinst->timer);
  
  	wiinst->state |= WAVE_STATE_STARTED;
  }
  
  void emu10k1_wavein_stop(struct emu10k1_wavedevice *wave_dev)
  {
  	struct emu10k1_card *card = wave_dev->card;
  	struct wiinst *wiinst = wave_dev->wiinst;
  
  	DPF(2, "emu10k1_wavein_stop()\n");
  
  	if (!(wiinst->state & WAVE_STATE_STARTED))
  		return;
  
  	emu10k1_timer_disable(card, &wiinst->timer);
  	emu10k1_stop_record(card, &wiinst->buffer);
  
  	wiinst->state &= ~WAVE_STATE_STARTED;
  }
  
  int emu10k1_wavein_setformat(struct emu10k1_wavedevice *wave_dev, struct wave_format *format)
  {
  	struct emu10k1_card *card = wave_dev->card;
  	struct wiinst *wiinst = wave_dev->wiinst;
  	u16 delay;
  
  	DPF(2, "emu10k1_wavein_setformat()\n");
  
  	if (wiinst->state & WAVE_STATE_STARTED)
  		return -1;
  
  	query_format(wiinst->recsrc, format);
  
  	if ((wiinst->format.samplingrate != format->samplingrate)
  	    || (wiinst->format.bitsperchannel != format->bitsperchannel)
  	    || (wiinst->format.channels != format->channels)) {
  
  		wiinst->format = *format;
  
  		if (wiinst->state == WAVE_STATE_CLOSED)
  			return 0;
  
  		wiinst->buffer.size *= wiinst->buffer.cov;
  
  		if (wiinst->format.bytesperchannel == 1) {
  			wiinst->buffer.cov = 2;
  			wiinst->buffer.size /= wiinst->buffer.cov;
  		} else
  			wiinst->buffer.cov = 1;
  
  		emu10k1_timer_uninstall(card, &wiinst->timer);
  
  		delay = (48000 * wiinst->buffer.fragment_size) / wiinst->format.bytespersec;
  
  		emu10k1_timer_install(card, &wiinst->timer, delay / 2);
  	}
  
  	return 0;
  }
  
  void emu10k1_wavein_getxfersize(struct wiinst *wiinst, u32 * size)
  {
  	struct wavein_buffer *buffer = &wiinst->buffer;
  
  	*size = buffer->bytestocopy;
  
  	if (wiinst->mmapped)
  		return;
  
  	if (*size > buffer->size) {
  		*size = buffer->size;
  		buffer->pos = buffer->hw_pos;
  		buffer->bytestocopy = buffer->size;
  		DPF(1, "buffer overrun\n");
  	}
  }
  
  static int copy_block(u8 __user *dst, u8 * src, u32 str, u32 len, u8 cov)
  {
  	if (cov == 1) {
  		if (__copy_to_user(dst, src + str, len))
  			return -EFAULT;
  	} else {
  		u8 byte;
  		u32 i;
  
  		src += 1 + 2 * str;
  
  		for (i = 0; i < len; i++) {
  			byte = src[2 * i] ^ 0x80;
  			if (__copy_to_user(dst + i, &byte, 1))
  				return -EFAULT;
  		}
  	}
  
  	return 0;
  }
  
  int emu10k1_wavein_xferdata(struct wiinst *wiinst, u8 __user *data, u32 * size)
  {
  	struct wavein_buffer *buffer = &wiinst->buffer;
  	u32 sizetocopy, sizetocopy_now, start;
  	unsigned long flags;
  	int ret;
  
  	sizetocopy = min_t(u32, buffer->size, *size);
  	*size = sizetocopy;
  
  	if (!sizetocopy)
  		return 0;
  
  	spin_lock_irqsave(&wiinst->lock, flags);
  	start = buffer->pos;
  	buffer->pos += sizetocopy;
  	buffer->pos %= buffer->size;
  	buffer->bytestocopy -= sizetocopy;
  	sizetocopy_now = buffer->size - start;
  
  	spin_unlock_irqrestore(&wiinst->lock, flags);
  
  	if (sizetocopy > sizetocopy_now) {
  		sizetocopy -= sizetocopy_now;
  
  		ret = copy_block(data, buffer->addr, start, sizetocopy_now,
  				 buffer->cov);
  		if (ret == 0)
  			ret = copy_block(data + sizetocopy_now, buffer->addr, 0,
  					 sizetocopy, buffer->cov);
  	} else {
  		ret = copy_block(data, buffer->addr, start, sizetocopy,
  				 buffer->cov);
  	}
  
  	return ret;
  }
  
  void emu10k1_wavein_update(struct emu10k1_card *card, struct wiinst *wiinst)
  {
  	u32 hw_pos;
  	u32 diff;
  
  	/* There is no actual start yet */
  	if (!(wiinst->state & WAVE_STATE_STARTED)) {
  		hw_pos = wiinst->buffer.hw_pos;
  	} else {
  		/* hw_pos in byte units */
  		hw_pos = sblive_readptr(card, wiinst->buffer.idxreg, 0) / wiinst->buffer.cov;
  	}
  
  	diff = (wiinst->buffer.size + hw_pos - wiinst->buffer.hw_pos) % wiinst->buffer.size;
  	wiinst->total_recorded += diff;
  	wiinst->buffer.bytestocopy += diff;
  
  	wiinst->buffer.hw_pos = hw_pos;
  }
  