sound/pci/oxygen/oxygen_pcm.c - kernel/msm-5.4 - Gitiles

 /*
  * C-Media CMI8788 driver - PCM code
  *
  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
  *
  *
  *  This driver is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License, version 2.
  *
  *  This driver 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 driver; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */

 #include <linux/pci.h>
 #include <sound/control.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include "oxygen.h"

 /* most DMA channels have a 16-bit counter for 32-bit words */
 #define BUFFER_BYTES_MAX		((1 << 16) * 4)
 /* the multichannel DMA channel has a 24-bit counter */
 #define BUFFER_BYTES_MAX_MULTICH	((1 << 24) * 4)

 #define PERIOD_BYTES_MIN		64

 #define DEFAULT_BUFFER_BYTES		(BUFFER_BYTES_MAX / 2)
 #define DEFAULT_BUFFER_BYTES_MULTICH	(1024 * 1024)

 static const struct snd_pcm_hardware oxygen_stereo_hardware = {
 	.info = SNDRV_PCM_INFO_MMAP |
 		SNDRV_PCM_INFO_MMAP_VALID |
 		SNDRV_PCM_INFO_INTERLEAVED |
 		SNDRV_PCM_INFO_PAUSE |
 		SNDRV_PCM_INFO_SYNC_START,
 	.formats = SNDRV_PCM_FMTBIT_S16_LE |
 		   SNDRV_PCM_FMTBIT_S32_LE,
 	.rates = SNDRV_PCM_RATE_32000 |
 		 SNDRV_PCM_RATE_44100 |
 		 SNDRV_PCM_RATE_48000 |
 		 SNDRV_PCM_RATE_64000 |
 		 SNDRV_PCM_RATE_88200 |
 		 SNDRV_PCM_RATE_96000 |
 		 SNDRV_PCM_RATE_176400 |
 		 SNDRV_PCM_RATE_192000,
 	.rate_min = 32000,
 	.rate_max = 192000,
 	.channels_min = 2,
 	.channels_max = 2,
 	.buffer_bytes_max = BUFFER_BYTES_MAX,
 	.period_bytes_min = PERIOD_BYTES_MIN,
 	.period_bytes_max = BUFFER_BYTES_MAX / 2,
 	.periods_min = 2,
 	.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
 };
 static const struct snd_pcm_hardware oxygen_multichannel_hardware = {
 	.info = SNDRV_PCM_INFO_MMAP |
 		SNDRV_PCM_INFO_MMAP_VALID |
 		SNDRV_PCM_INFO_INTERLEAVED |
 		SNDRV_PCM_INFO_PAUSE |
 		SNDRV_PCM_INFO_SYNC_START,
 	.formats = SNDRV_PCM_FMTBIT_S16_LE |
 		   SNDRV_PCM_FMTBIT_S32_LE,
 	.rates = SNDRV_PCM_RATE_32000 |
 		 SNDRV_PCM_RATE_44100 |
 		 SNDRV_PCM_RATE_48000 |
 		 SNDRV_PCM_RATE_64000 |
 		 SNDRV_PCM_RATE_88200 |
 		 SNDRV_PCM_RATE_96000 |
 		 SNDRV_PCM_RATE_176400 |
 		 SNDRV_PCM_RATE_192000,
 	.rate_min = 32000,
 	.rate_max = 192000,
 	.channels_min = 2,
 	.channels_max = 8,
 	.buffer_bytes_max = BUFFER_BYTES_MAX_MULTICH,
 	.period_bytes_min = PERIOD_BYTES_MIN,
 	.period_bytes_max = BUFFER_BYTES_MAX_MULTICH / 2,
 	.periods_min = 2,
 	.periods_max = BUFFER_BYTES_MAX_MULTICH / PERIOD_BYTES_MIN,
 };
 static const struct snd_pcm_hardware oxygen_ac97_hardware = {
 	.info = SNDRV_PCM_INFO_MMAP |
 		SNDRV_PCM_INFO_MMAP_VALID |
 		SNDRV_PCM_INFO_INTERLEAVED |
 		SNDRV_PCM_INFO_PAUSE |
 		SNDRV_PCM_INFO_SYNC_START,
 	.formats = SNDRV_PCM_FMTBIT_S16_LE,
 	.rates = SNDRV_PCM_RATE_48000,
 	.rate_min = 48000,
 	.rate_max = 48000,
 	.channels_min = 2,
 	.channels_max = 2,
 	.buffer_bytes_max = BUFFER_BYTES_MAX,
 	.period_bytes_min = PERIOD_BYTES_MIN,
 	.period_bytes_max = BUFFER_BYTES_MAX / 2,
 	.periods_min = 2,
 	.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
 };

 static const struct snd_pcm_hardware *const oxygen_hardware[PCM_COUNT] = {
 	[PCM_A] = &oxygen_stereo_hardware,
 	[PCM_B] = &oxygen_stereo_hardware,
 	[PCM_C] = &oxygen_stereo_hardware,
 	[PCM_SPDIF] = &oxygen_stereo_hardware,
 	[PCM_MULTICH] = &oxygen_multichannel_hardware,
 	[PCM_AC97] = &oxygen_ac97_hardware,
 };

 static inline unsigned int
 oxygen_substream_channel(struct snd_pcm_substream *substream)
 {
 	return (unsigned int)(uintptr_t)substream->runtime->private_data;
 }

 static int oxygen_open(struct snd_pcm_substream *substream,
 		       unsigned int channel)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	int err;

 	runtime->private_data = (void *)(uintptr_t)channel;
 	if (channel == PCM_B && chip->has_ac97_1 &&
 	    (chip->model->pcm_dev_cfg & CAPTURE_2_FROM_AC97_1))
 		runtime->hw = oxygen_ac97_hardware;
 	else
 		runtime->hw = *oxygen_hardware[channel];
 	switch (channel) {
 	case PCM_C:
 		runtime->hw.rates &= ~(SNDRV_PCM_RATE_32000 |
 				       SNDRV_PCM_RATE_64000);
 		runtime->hw.rate_min = 44100;
 		break;
 	case PCM_MULTICH:
 		runtime->hw.channels_max = chip->model->dac_channels;
 		break;
 	}
 	if (chip->model->pcm_hardware_filter)
 		chip->model->pcm_hardware_filter(channel, &runtime->hw);
 	err = snd_pcm_hw_constraint_step(runtime, 0,
 					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
 	if (err < 0)
 		return err;
 	err = snd_pcm_hw_constraint_step(runtime, 0,
 					 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
 	if (err < 0)
 		return err;
 	if (runtime->hw.formats & SNDRV_PCM_FMTBIT_S32_LE) {
 		err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
 		if (err < 0)
 			return err;
 	}
 	if (runtime->hw.channels_max > 2) {
 		err = snd_pcm_hw_constraint_step(runtime, 0,
 						 SNDRV_PCM_HW_PARAM_CHANNELS,
 						 2);
 		if (err < 0)
 			return err;
 	}
 	if (channel == PCM_MULTICH) {
 		err = snd_pcm_hw_constraint_minmax
 			(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 0, 8192000);
 		if (err < 0)
 			return err;
 	}
 	snd_pcm_set_sync(substream);
 	chip->streams[channel] = substream;

 	mutex_lock(&chip->mutex);
 	chip->pcm_active |= 1 << channel;
 	if (channel == PCM_SPDIF) {
 		chip->spdif_pcm_bits = chip->spdif_bits;
 		chip->controls[CONTROL_SPDIF_PCM]->vd[0].access &=
 			~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE |
 			       SNDRV_CTL_EVENT_MASK_INFO,
 			       &chip->controls[CONTROL_SPDIF_PCM]->id);
 	}
 	mutex_unlock(&chip->mutex);

 	return 0;
 }

 static int oxygen_rec_a_open(struct snd_pcm_substream *substream)
 {
 	return oxygen_open(substream, PCM_A);
 }

 static int oxygen_rec_b_open(struct snd_pcm_substream *substream)
 {
 	return oxygen_open(substream, PCM_B);
 }

 static int oxygen_rec_c_open(struct snd_pcm_substream *substream)
 {
 	return oxygen_open(substream, PCM_C);
 }

 static int oxygen_spdif_open(struct snd_pcm_substream *substream)
 {
 	return oxygen_open(substream, PCM_SPDIF);
 }

 static int oxygen_multich_open(struct snd_pcm_substream *substream)
 {
 	return oxygen_open(substream, PCM_MULTICH);
 }

 static int oxygen_ac97_open(struct snd_pcm_substream *substream)
 {
 	return oxygen_open(substream, PCM_AC97);
 }

 static int oxygen_close(struct snd_pcm_substream *substream)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	unsigned int channel = oxygen_substream_channel(substream);

 	mutex_lock(&chip->mutex);
 	chip->pcm_active &= ~(1 << channel);
 	if (channel == PCM_SPDIF) {
 		chip->controls[CONTROL_SPDIF_PCM]->vd[0].access |=
 			SNDRV_CTL_ELEM_ACCESS_INACTIVE;
 		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE |
 			       SNDRV_CTL_EVENT_MASK_INFO,
 			       &chip->controls[CONTROL_SPDIF_PCM]->id);
 	}
 	if (channel == PCM_SPDIF || channel == PCM_MULTICH)
 		oxygen_update_spdif_source(chip);
 	mutex_unlock(&chip->mutex);

 	chip->streams[channel] = NULL;
 	return 0;
 }

 static unsigned int oxygen_format(struct snd_pcm_hw_params *hw_params)
 {
 	if (params_format(hw_params) == SNDRV_PCM_FORMAT_S32_LE)
 		return OXYGEN_FORMAT_24;
 	else
 		return OXYGEN_FORMAT_16;
 }

 static unsigned int oxygen_rate(struct snd_pcm_hw_params *hw_params)
 {
 	switch (params_rate(hw_params)) {
 	case 32000:
 		return OXYGEN_RATE_32000;
 	case 44100:
 		return OXYGEN_RATE_44100;
 	default: /* 48000 */
 		return OXYGEN_RATE_48000;
 	case 64000:
 		return OXYGEN_RATE_64000;
 	case 88200:
 		return OXYGEN_RATE_88200;
 	case 96000:
 		return OXYGEN_RATE_96000;
 	case 176400:
 		return OXYGEN_RATE_176400;
 	case 192000:
 		return OXYGEN_RATE_192000;
 	}
 }

 static unsigned int oxygen_i2s_mclk(struct snd_pcm_hw_params *hw_params)
 {
 	if (params_rate(hw_params) <= 96000)
 		return OXYGEN_I2S_MCLK_256;
 	else
 		return OXYGEN_I2S_MCLK_128;
 }

 static unsigned int oxygen_i2s_bits(struct snd_pcm_hw_params *hw_params)
 {
 	if (params_format(hw_params) == SNDRV_PCM_FORMAT_S32_LE)
 		return OXYGEN_I2S_BITS_24;
 	else
 		return OXYGEN_I2S_BITS_16;
 }

 static unsigned int oxygen_play_channels(struct snd_pcm_hw_params *hw_params)
 {
 	switch (params_channels(hw_params)) {
 	default: /* 2 */
 		return OXYGEN_PLAY_CHANNELS_2;
 	case 4:
 		return OXYGEN_PLAY_CHANNELS_4;
 	case 6:
 		return OXYGEN_PLAY_CHANNELS_6;
 	case 8:
 		return OXYGEN_PLAY_CHANNELS_8;
 	}
 }

 static const unsigned int channel_base_registers[PCM_COUNT] = {
 	[PCM_A] = OXYGEN_DMA_A_ADDRESS,
 	[PCM_B] = OXYGEN_DMA_B_ADDRESS,
 	[PCM_C] = OXYGEN_DMA_C_ADDRESS,
 	[PCM_SPDIF] = OXYGEN_DMA_SPDIF_ADDRESS,
 	[PCM_MULTICH] = OXYGEN_DMA_MULTICH_ADDRESS,
 	[PCM_AC97] = OXYGEN_DMA_AC97_ADDRESS,
 };

 static int oxygen_hw_params(struct snd_pcm_substream *substream,
 			    struct snd_pcm_hw_params *hw_params)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	unsigned int channel = oxygen_substream_channel(substream);
 	int err;

 	err = snd_pcm_lib_malloc_pages(substream,
 				       params_buffer_bytes(hw_params));
 	if (err < 0)
 		return err;

 	oxygen_write32(chip, channel_base_registers[channel],
 		       (u32)substream->runtime->dma_addr);
 	if (channel == PCM_MULTICH) {
 		oxygen_write32(chip, OXYGEN_DMA_MULTICH_COUNT,
 			       params_buffer_bytes(hw_params) / 4 - 1);
 		oxygen_write32(chip, OXYGEN_DMA_MULTICH_TCOUNT,
 			       params_period_bytes(hw_params) / 4 - 1);
 	} else {
 		oxygen_write16(chip, channel_base_registers[channel] + 4,
 			       params_buffer_bytes(hw_params) / 4 - 1);
 		oxygen_write16(chip, channel_base_registers[channel] + 6,
 			       params_period_bytes(hw_params) / 4 - 1);
 	}
 	return 0;
 }

 static int oxygen_rec_a_hw_params(struct snd_pcm_substream *substream,
 				  struct snd_pcm_hw_params *hw_params)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	int err;

 	err = oxygen_hw_params(substream, hw_params);
 	if (err < 0)
 		return err;

 	spin_lock_irq(&chip->reg_lock);
 	oxygen_write8_masked(chip, OXYGEN_REC_FORMAT,
 			     oxygen_format(hw_params) << OXYGEN_REC_FORMAT_A_SHIFT,
 			     OXYGEN_REC_FORMAT_A_MASK);
 	oxygen_write16_masked(chip, OXYGEN_I2S_A_FORMAT,
 			      oxygen_rate(hw_params) |
 			      oxygen_i2s_mclk(hw_params) |
 			      chip->model->adc_i2s_format |
 			      oxygen_i2s_bits(hw_params),
 			      OXYGEN_I2S_RATE_MASK |
 			      OXYGEN_I2S_FORMAT_MASK |
 			      OXYGEN_I2S_MCLK_MASK |
 			      OXYGEN_I2S_BITS_MASK);
 	spin_unlock_irq(&chip->reg_lock);

 	mutex_lock(&chip->mutex);
 	chip->model->set_adc_params(chip, hw_params);
 	mutex_unlock(&chip->mutex);
 	return 0;
 }

 static int oxygen_rec_b_hw_params(struct snd_pcm_substream *substream,
 				  struct snd_pcm_hw_params *hw_params)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	int is_ac97;
 	int err;

 	err = oxygen_hw_params(substream, hw_params);
 	if (err < 0)
 		return err;

 	is_ac97 = chip->has_ac97_1 &&
 		(chip->model->pcm_dev_cfg & CAPTURE_2_FROM_AC97_1);

 	spin_lock_irq(&chip->reg_lock);
 	oxygen_write8_masked(chip, OXYGEN_REC_FORMAT,
 			     oxygen_format(hw_params) << OXYGEN_REC_FORMAT_B_SHIFT,
 			     OXYGEN_REC_FORMAT_B_MASK);
 	if (!is_ac97)
 		oxygen_write16_masked(chip, OXYGEN_I2S_B_FORMAT,
 				      oxygen_rate(hw_params) |
 				      oxygen_i2s_mclk(hw_params) |
 				      chip->model->adc_i2s_format |
 				      oxygen_i2s_bits(hw_params),
 				      OXYGEN_I2S_RATE_MASK |
 				      OXYGEN_I2S_FORMAT_MASK |
 				      OXYGEN_I2S_MCLK_MASK |
 				      OXYGEN_I2S_BITS_MASK);
 	spin_unlock_irq(&chip->reg_lock);

 	if (!is_ac97) {
 		mutex_lock(&chip->mutex);
 		chip->model->set_adc_params(chip, hw_params);
 		mutex_unlock(&chip->mutex);
 	}
 	return 0;
 }

 static int oxygen_rec_c_hw_params(struct snd_pcm_substream *substream,
 				  struct snd_pcm_hw_params *hw_params)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	int err;

 	err = oxygen_hw_params(substream, hw_params);
 	if (err < 0)
 		return err;

 	spin_lock_irq(&chip->reg_lock);
 	oxygen_write8_masked(chip, OXYGEN_REC_FORMAT,
 			     oxygen_format(hw_params) << OXYGEN_REC_FORMAT_C_SHIFT,
 			     OXYGEN_REC_FORMAT_C_MASK);
 	spin_unlock_irq(&chip->reg_lock);
 	return 0;
 }

 static int oxygen_spdif_hw_params(struct snd_pcm_substream *substream,
 				  struct snd_pcm_hw_params *hw_params)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	int err;

 	err = oxygen_hw_params(substream, hw_params);
 	if (err < 0)
 		return err;

 	spin_lock_irq(&chip->reg_lock);
 	oxygen_clear_bits32(chip, OXYGEN_SPDIF_CONTROL,
 			    OXYGEN_SPDIF_OUT_ENABLE);
 	oxygen_write8_masked(chip, OXYGEN_PLAY_FORMAT,
 			     oxygen_format(hw_params) << OXYGEN_SPDIF_FORMAT_SHIFT,
 			     OXYGEN_SPDIF_FORMAT_MASK);
 	oxygen_write32_masked(chip, OXYGEN_SPDIF_CONTROL,
 			      oxygen_rate(hw_params) << OXYGEN_SPDIF_OUT_RATE_SHIFT,
 			      OXYGEN_SPDIF_OUT_RATE_MASK);
 	oxygen_update_spdif_source(chip);
 	spin_unlock_irq(&chip->reg_lock);
 	return 0;
 }

 static int oxygen_multich_hw_params(struct snd_pcm_substream *substream,
 				    struct snd_pcm_hw_params *hw_params)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	int err;

 	err = oxygen_hw_params(substream, hw_params);
 	if (err < 0)
 		return err;

 	spin_lock_irq(&chip->reg_lock);
 	oxygen_write8_masked(chip, OXYGEN_PLAY_CHANNELS,
 			     oxygen_play_channels(hw_params),
 			     OXYGEN_PLAY_CHANNELS_MASK);
 	oxygen_write8_masked(chip, OXYGEN_PLAY_FORMAT,
 			     oxygen_format(hw_params) << OXYGEN_MULTICH_FORMAT_SHIFT,
 			     OXYGEN_MULTICH_FORMAT_MASK);
 	oxygen_write16_masked(chip, OXYGEN_I2S_MULTICH_FORMAT,
 			      oxygen_rate(hw_params) |
 			      chip->model->dac_i2s_format |
 			      oxygen_i2s_bits(hw_params),
 			      OXYGEN_I2S_RATE_MASK |
 			      OXYGEN_I2S_FORMAT_MASK |
 			      OXYGEN_I2S_BITS_MASK);
 	oxygen_update_dac_routing(chip);
 	oxygen_update_spdif_source(chip);
 	spin_unlock_irq(&chip->reg_lock);

 	mutex_lock(&chip->mutex);
 	chip->model->set_dac_params(chip, hw_params);
 	mutex_unlock(&chip->mutex);
 	return 0;
 }

 static int oxygen_hw_free(struct snd_pcm_substream *substream)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	unsigned int channel = oxygen_substream_channel(substream);

 	spin_lock_irq(&chip->reg_lock);
 	chip->interrupt_mask &= ~(1 << channel);
 	oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, chip->interrupt_mask);
 	spin_unlock_irq(&chip->reg_lock);

 	return snd_pcm_lib_free_pages(substream);
 }

 static int oxygen_spdif_hw_free(struct snd_pcm_substream *substream)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);

 	spin_lock_irq(&chip->reg_lock);
 	oxygen_clear_bits32(chip, OXYGEN_SPDIF_CONTROL,
 			    OXYGEN_SPDIF_OUT_ENABLE);
 	spin_unlock_irq(&chip->reg_lock);
 	return oxygen_hw_free(substream);
 }

 static int oxygen_prepare(struct snd_pcm_substream *substream)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	unsigned int channel = oxygen_substream_channel(substream);
 	unsigned int channel_mask = 1 << channel;

 	spin_lock_irq(&chip->reg_lock);
 	oxygen_set_bits8(chip, OXYGEN_DMA_FLUSH, channel_mask);
 	oxygen_clear_bits8(chip, OXYGEN_DMA_FLUSH, channel_mask);

 	chip->interrupt_mask |= channel_mask;
 	oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, chip->interrupt_mask);
 	spin_unlock_irq(&chip->reg_lock);
 	return 0;
 }

 static int oxygen_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	struct snd_pcm_substream *s;
 	unsigned int mask = 0;
 	int pausing;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_STOP:
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 		pausing = 0;
 		break;
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		pausing = 1;
 		break;
 	default:
 		return -EINVAL;
 	}

 	snd_pcm_group_for_each_entry(s, substream) {
 		if (snd_pcm_substream_chip(s) == chip) {
 			mask |= 1 << oxygen_substream_channel(s);
 			snd_pcm_trigger_done(s, substream);
 		}
 	}

 	spin_lock(&chip->reg_lock);
 	if (!pausing) {
 		if (cmd == SNDRV_PCM_TRIGGER_START)
 			chip->pcm_running |= mask;
 		else
 			chip->pcm_running &= ~mask;
 		oxygen_write8(chip, OXYGEN_DMA_STATUS, chip->pcm_running);
 	} else {
 		if (cmd == SNDRV_PCM_TRIGGER_PAUSE_PUSH)
 			oxygen_set_bits8(chip, OXYGEN_DMA_PAUSE, mask);
 		else
 			oxygen_clear_bits8(chip, OXYGEN_DMA_PAUSE, mask);
 	}
 	spin_unlock(&chip->reg_lock);
 	return 0;
 }

 static snd_pcm_uframes_t oxygen_pointer(struct snd_pcm_substream *substream)
 {
 	struct oxygen *chip = snd_pcm_substream_chip(substream);
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	unsigned int channel = oxygen_substream_channel(substream);
 	u32 curr_addr;

 	/* no spinlock, this read should be atomic */
 	curr_addr = oxygen_read32(chip, channel_base_registers[channel]);
 	return bytes_to_frames(runtime, curr_addr - (u32)runtime->dma_addr);
 }

 static struct snd_pcm_ops oxygen_rec_a_ops = {
 	.open      = oxygen_rec_a_open,
 	.close     = oxygen_close,
 	.ioctl     = snd_pcm_lib_ioctl,
 	.hw_params = oxygen_rec_a_hw_params,
 	.hw_free   = oxygen_hw_free,
 	.prepare   = oxygen_prepare,
 	.trigger   = oxygen_trigger,
 	.pointer   = oxygen_pointer,
 };

 static struct snd_pcm_ops oxygen_rec_b_ops = {
 	.open      = oxygen_rec_b_open,
 	.close     = oxygen_close,
 	.ioctl     = snd_pcm_lib_ioctl,
 	.hw_params = oxygen_rec_b_hw_params,
 	.hw_free   = oxygen_hw_free,
 	.prepare   = oxygen_prepare,
 	.trigger   = oxygen_trigger,
 	.pointer   = oxygen_pointer,
 };

 static struct snd_pcm_ops oxygen_rec_c_ops = {
 	.open      = oxygen_rec_c_open,
 	.close     = oxygen_close,
 	.ioctl     = snd_pcm_lib_ioctl,
 	.hw_params = oxygen_rec_c_hw_params,
 	.hw_free   = oxygen_hw_free,
 	.prepare   = oxygen_prepare,
 	.trigger   = oxygen_trigger,
 	.pointer   = oxygen_pointer,
 };

 static struct snd_pcm_ops oxygen_spdif_ops = {
 	.open      = oxygen_spdif_open,
 	.close     = oxygen_close,
 	.ioctl     = snd_pcm_lib_ioctl,
 	.hw_params = oxygen_spdif_hw_params,
 	.hw_free   = oxygen_spdif_hw_free,
 	.prepare   = oxygen_prepare,
 	.trigger   = oxygen_trigger,
 	.pointer   = oxygen_pointer,
 };

 static struct snd_pcm_ops oxygen_multich_ops = {
 	.open      = oxygen_multich_open,
 	.close     = oxygen_close,
 	.ioctl     = snd_pcm_lib_ioctl,
 	.hw_params = oxygen_multich_hw_params,
 	.hw_free   = oxygen_hw_free,
 	.prepare   = oxygen_prepare,
 	.trigger   = oxygen_trigger,
 	.pointer   = oxygen_pointer,
 };

 static struct snd_pcm_ops oxygen_ac97_ops = {
 	.open      = oxygen_ac97_open,
 	.close     = oxygen_close,
 	.ioctl     = snd_pcm_lib_ioctl,
 	.hw_params = oxygen_hw_params,
 	.hw_free   = oxygen_hw_free,
 	.prepare   = oxygen_prepare,
 	.trigger   = oxygen_trigger,
 	.pointer   = oxygen_pointer,
 };

 static void oxygen_pcm_free(struct snd_pcm *pcm)
 {
 	snd_pcm_lib_preallocate_free_for_all(pcm);
 }

 int oxygen_pcm_init(struct oxygen *chip)
 {
 	struct snd_pcm *pcm;
 	int outs, ins;
 	int err;

 	outs = !!(chip->model->pcm_dev_cfg & PLAYBACK_0_TO_I2S);
 	ins = !!(chip->model->pcm_dev_cfg & (CAPTURE_0_FROM_I2S_1 |
 					     CAPTURE_0_FROM_I2S_2));
 	if (outs | ins) {
 		err = snd_pcm_new(chip->card, "Analog", 0, outs, ins, &pcm);
 		if (err < 0)
 			return err;
 		if (outs)
 			snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 					&oxygen_multich_ops);
 		if (chip->model->pcm_dev_cfg & CAPTURE_0_FROM_I2S_1)
 			snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 					&oxygen_rec_a_ops);
 		else if (chip->model->pcm_dev_cfg & CAPTURE_0_FROM_I2S_2)
 			snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 					&oxygen_rec_b_ops);
 		pcm->private_data = chip;
 		pcm->private_free = oxygen_pcm_free;
 		strcpy(pcm->name, "Analog");
 		if (outs)
 			snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
 						      SNDRV_DMA_TYPE_DEV,
 						      snd_dma_pci_data(chip->pci),
 						      DEFAULT_BUFFER_BYTES_MULTICH,
 						      BUFFER_BYTES_MAX_MULTICH);
 		if (ins)
 			snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
 						      SNDRV_DMA_TYPE_DEV,
 						      snd_dma_pci_data(chip->pci),
 						      DEFAULT_BUFFER_BYTES,
 						      BUFFER_BYTES_MAX);
 	}

 	outs = !!(chip->model->pcm_dev_cfg & PLAYBACK_1_TO_SPDIF);
 	ins = !!(chip->model->pcm_dev_cfg & CAPTURE_1_FROM_SPDIF);
 	if (outs | ins) {
 		err = snd_pcm_new(chip->card, "Digital", 1, outs, ins, &pcm);
 		if (err < 0)
 			return err;
 		if (outs)
 			snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 					&oxygen_spdif_ops);
 		if (ins)
 			snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 					&oxygen_rec_c_ops);
 		pcm->private_data = chip;
 		pcm->private_free = oxygen_pcm_free;
 		strcpy(pcm->name, "Digital");
 		snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 						      snd_dma_pci_data(chip->pci),
 						      DEFAULT_BUFFER_BYTES,
 						      BUFFER_BYTES_MAX);
 	}

 	if (chip->has_ac97_1) {
 		outs = !!(chip->model->pcm_dev_cfg & PLAYBACK_2_TO_AC97_1);
 		ins = !!(chip->model->pcm_dev_cfg & CAPTURE_2_FROM_AC97_1);
 	} else {
 		outs = 0;
 		ins = !!(chip->model->pcm_dev_cfg & CAPTURE_2_FROM_I2S_2);
 	}
 	if (outs | ins) {
 		err = snd_pcm_new(chip->card, outs ? "AC97" : "Analog2",
 				  2, outs, ins, &pcm);
 		if (err < 0)
 			return err;
 		if (outs) {
 			snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
 					&oxygen_ac97_ops);
 			oxygen_write8_masked(chip, OXYGEN_REC_ROUTING,
 					     OXYGEN_REC_B_ROUTE_AC97_1,
 					     OXYGEN_REC_B_ROUTE_MASK);
 		}
 		if (ins)
 			snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
 					&oxygen_rec_b_ops);
 		pcm->private_data = chip;
 		pcm->private_free = oxygen_pcm_free;
 		strcpy(pcm->name, outs ? "Front Panel" : "Analog 2");
 		snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
 						      snd_dma_pci_data(chip->pci),
 						      DEFAULT_BUFFER_BYTES,
 						      BUFFER_BYTES_MAX);
 	}
 	return 0;
 }
	/*
	* C-Media CMI8788 driver - PCM code
	*
	* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
	*
	*
	* This driver is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License, version 2.
	*
	* This driver 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 driver; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include <linux/pci.h>
	#include <sound/control.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include "oxygen.h"

	/* most DMA channels have a 16-bit counter for 32-bit words */
	#define BUFFER_BYTES_MAX ((1 << 16) * 4)
	/* the multichannel DMA channel has a 24-bit counter */
	#define BUFFER_BYTES_MAX_MULTICH ((1 << 24) * 4)

	#define PERIOD_BYTES_MIN 64

	#define DEFAULT_BUFFER_BYTES (BUFFER_BYTES_MAX / 2)
	#define DEFAULT_BUFFER_BYTES_MULTICH (1024 * 1024)

	static const struct snd_pcm_hardware oxygen_stereo_hardware = {
	.info = SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_PAUSE \|
	SNDRV_PCM_INFO_SYNC_START,
	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S32_LE,
	.rates = SNDRV_PCM_RATE_32000 \|
	SNDRV_PCM_RATE_44100 \|
	SNDRV_PCM_RATE_48000 \|
	SNDRV_PCM_RATE_64000 \|
	SNDRV_PCM_RATE_88200 \|
	SNDRV_PCM_RATE_96000 \|
	SNDRV_PCM_RATE_176400 \|
	SNDRV_PCM_RATE_192000,
	.rate_min = 32000,
	.rate_max = 192000,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = BUFFER_BYTES_MAX,
	.period_bytes_min = PERIOD_BYTES_MIN,
	.period_bytes_max = BUFFER_BYTES_MAX / 2,
	.periods_min = 2,
	.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
	};
	static const struct snd_pcm_hardware oxygen_multichannel_hardware = {
	.info = SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_PAUSE \|
	SNDRV_PCM_INFO_SYNC_START,
	.formats = SNDRV_PCM_FMTBIT_S16_LE \|
	SNDRV_PCM_FMTBIT_S32_LE,
	.rates = SNDRV_PCM_RATE_32000 \|
	SNDRV_PCM_RATE_44100 \|
	SNDRV_PCM_RATE_48000 \|
	SNDRV_PCM_RATE_64000 \|
	SNDRV_PCM_RATE_88200 \|
	SNDRV_PCM_RATE_96000 \|
	SNDRV_PCM_RATE_176400 \|
	SNDRV_PCM_RATE_192000,
	.rate_min = 32000,
	.rate_max = 192000,
	.channels_min = 2,
	.channels_max = 8,
	.buffer_bytes_max = BUFFER_BYTES_MAX_MULTICH,
	.period_bytes_min = PERIOD_BYTES_MIN,
	.period_bytes_max = BUFFER_BYTES_MAX_MULTICH / 2,
	.periods_min = 2,
	.periods_max = BUFFER_BYTES_MAX_MULTICH / PERIOD_BYTES_MIN,
	};
	static const struct snd_pcm_hardware oxygen_ac97_hardware = {
	.info = SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_PAUSE \|
	SNDRV_PCM_INFO_SYNC_START,
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rates = SNDRV_PCM_RATE_48000,
	.rate_min = 48000,
	.rate_max = 48000,
	.channels_min = 2,
	.channels_max = 2,
	.buffer_bytes_max = BUFFER_BYTES_MAX,
	.period_bytes_min = PERIOD_BYTES_MIN,
	.period_bytes_max = BUFFER_BYTES_MAX / 2,
	.periods_min = 2,
	.periods_max = BUFFER_BYTES_MAX / PERIOD_BYTES_MIN,
	};

	static const struct snd_pcm_hardware *const oxygen_hardware[PCM_COUNT] = {
	[PCM_A] = &oxygen_stereo_hardware,
	[PCM_B] = &oxygen_stereo_hardware,
	[PCM_C] = &oxygen_stereo_hardware,
	[PCM_SPDIF] = &oxygen_stereo_hardware,
	[PCM_MULTICH] = &oxygen_multichannel_hardware,
	[PCM_AC97] = &oxygen_ac97_hardware,
	};

	static inline unsigned int
	oxygen_substream_channel(struct snd_pcm_substream *substream)
	{
	return (unsigned int)(uintptr_t)substream->runtime->private_data;
	}

	static int oxygen_open(struct snd_pcm_substream *substream,
	unsigned int channel)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	int err;

	runtime->private_data = (void *)(uintptr_t)channel;
	if (channel == PCM_B && chip->has_ac97_1 &&
	(chip->model->pcm_dev_cfg & CAPTURE_2_FROM_AC97_1))
	runtime->hw = oxygen_ac97_hardware;
	else
	runtime->hw = *oxygen_hardware[channel];
	switch (channel) {
	case PCM_C:
	runtime->hw.rates &= ~(SNDRV_PCM_RATE_32000 \|
	SNDRV_PCM_RATE_64000);
	runtime->hw.rate_min = 44100;
	break;
	case PCM_MULTICH:
	runtime->hw.channels_max = chip->model->dac_channels;
	break;
	}
	if (chip->model->pcm_hardware_filter)
	chip->model->pcm_hardware_filter(channel, &runtime->hw);
	err = snd_pcm_hw_constraint_step(runtime, 0,
	SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 32);
	if (err < 0)
	return err;
	err = snd_pcm_hw_constraint_step(runtime, 0,
	SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 32);
	if (err < 0)
	return err;
	if (runtime->hw.formats & SNDRV_PCM_FMTBIT_S32_LE) {
	err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
	if (err < 0)
	return err;
	}
	if (runtime->hw.channels_max > 2) {
	err = snd_pcm_hw_constraint_step(runtime, 0,
	SNDRV_PCM_HW_PARAM_CHANNELS,
	2);
	if (err < 0)
	return err;
	}
	if (channel == PCM_MULTICH) {
	err = snd_pcm_hw_constraint_minmax
	(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 0, 8192000);
	if (err < 0)
	return err;
	}
	snd_pcm_set_sync(substream);
	chip->streams[channel] = substream;

	mutex_lock(&chip->mutex);
	chip->pcm_active \|= 1 << channel;
	if (channel == PCM_SPDIF) {
	chip->spdif_pcm_bits = chip->spdif_bits;
	chip->controls[CONTROL_SPDIF_PCM]->vd[0].access &=
	~SNDRV_CTL_ELEM_ACCESS_INACTIVE;
	snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE \|
	SNDRV_CTL_EVENT_MASK_INFO,
	&chip->controls[CONTROL_SPDIF_PCM]->id);
	}
	mutex_unlock(&chip->mutex);

	return 0;
	}

	static int oxygen_rec_a_open(struct snd_pcm_substream *substream)
	{
	return oxygen_open(substream, PCM_A);
	}

	static int oxygen_rec_b_open(struct snd_pcm_substream *substream)
	{
	return oxygen_open(substream, PCM_B);
	}

	static int oxygen_rec_c_open(struct snd_pcm_substream *substream)
	{
	return oxygen_open(substream, PCM_C);
	}

	static int oxygen_spdif_open(struct snd_pcm_substream *substream)
	{
	return oxygen_open(substream, PCM_SPDIF);
	}

	static int oxygen_multich_open(struct snd_pcm_substream *substream)
	{
	return oxygen_open(substream, PCM_MULTICH);
	}

	static int oxygen_ac97_open(struct snd_pcm_substream *substream)
	{
	return oxygen_open(substream, PCM_AC97);
	}

	static int oxygen_close(struct snd_pcm_substream *substream)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	unsigned int channel = oxygen_substream_channel(substream);

	mutex_lock(&chip->mutex);
	chip->pcm_active &= ~(1 << channel);
	if (channel == PCM_SPDIF) {
	chip->controls[CONTROL_SPDIF_PCM]->vd[0].access \|=
	SNDRV_CTL_ELEM_ACCESS_INACTIVE;
	snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE \|
	SNDRV_CTL_EVENT_MASK_INFO,
	&chip->controls[CONTROL_SPDIF_PCM]->id);
	}
	if (channel == PCM_SPDIF \|\| channel == PCM_MULTICH)
	oxygen_update_spdif_source(chip);
	mutex_unlock(&chip->mutex);

	chip->streams[channel] = NULL;
	return 0;
	}

	static unsigned int oxygen_format(struct snd_pcm_hw_params *hw_params)
	{
	if (params_format(hw_params) == SNDRV_PCM_FORMAT_S32_LE)
	return OXYGEN_FORMAT_24;
	else
	return OXYGEN_FORMAT_16;
	}

	static unsigned int oxygen_rate(struct snd_pcm_hw_params *hw_params)
	{
	switch (params_rate(hw_params)) {
	case 32000:
	return OXYGEN_RATE_32000;
	case 44100:
	return OXYGEN_RATE_44100;
	default: /* 48000 */
	return OXYGEN_RATE_48000;
	case 64000:
	return OXYGEN_RATE_64000;
	case 88200:
	return OXYGEN_RATE_88200;
	case 96000:
	return OXYGEN_RATE_96000;
	case 176400:
	return OXYGEN_RATE_176400;
	case 192000:
	return OXYGEN_RATE_192000;
	}
	}

	static unsigned int oxygen_i2s_mclk(struct snd_pcm_hw_params *hw_params)
	{
	if (params_rate(hw_params) <= 96000)
	return OXYGEN_I2S_MCLK_256;
	else
	return OXYGEN_I2S_MCLK_128;
	}

	static unsigned int oxygen_i2s_bits(struct snd_pcm_hw_params *hw_params)
	{
	if (params_format(hw_params) == SNDRV_PCM_FORMAT_S32_LE)
	return OXYGEN_I2S_BITS_24;
	else
	return OXYGEN_I2S_BITS_16;
	}

	static unsigned int oxygen_play_channels(struct snd_pcm_hw_params *hw_params)
	{
	switch (params_channels(hw_params)) {
	default: /* 2 */
	return OXYGEN_PLAY_CHANNELS_2;
	case 4:
	return OXYGEN_PLAY_CHANNELS_4;
	case 6:
	return OXYGEN_PLAY_CHANNELS_6;
	case 8:
	return OXYGEN_PLAY_CHANNELS_8;
	}
	}

	static const unsigned int channel_base_registers[PCM_COUNT] = {
	[PCM_A] = OXYGEN_DMA_A_ADDRESS,
	[PCM_B] = OXYGEN_DMA_B_ADDRESS,
	[PCM_C] = OXYGEN_DMA_C_ADDRESS,
	[PCM_SPDIF] = OXYGEN_DMA_SPDIF_ADDRESS,
	[PCM_MULTICH] = OXYGEN_DMA_MULTICH_ADDRESS,
	[PCM_AC97] = OXYGEN_DMA_AC97_ADDRESS,
	};

	static int oxygen_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	unsigned int channel = oxygen_substream_channel(substream);
	int err;

	err = snd_pcm_lib_malloc_pages(substream,
	params_buffer_bytes(hw_params));
	if (err < 0)
	return err;

	oxygen_write32(chip, channel_base_registers[channel],
	(u32)substream->runtime->dma_addr);
	if (channel == PCM_MULTICH) {
	oxygen_write32(chip, OXYGEN_DMA_MULTICH_COUNT,
	params_buffer_bytes(hw_params) / 4 - 1);
	oxygen_write32(chip, OXYGEN_DMA_MULTICH_TCOUNT,
	params_period_bytes(hw_params) / 4 - 1);
	} else {
	oxygen_write16(chip, channel_base_registers[channel] + 4,
	params_buffer_bytes(hw_params) / 4 - 1);
	oxygen_write16(chip, channel_base_registers[channel] + 6,
	params_period_bytes(hw_params) / 4 - 1);
	}
	return 0;
	}

	static int oxygen_rec_a_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	int err;

	err = oxygen_hw_params(substream, hw_params);
	if (err < 0)
	return err;

	spin_lock_irq(&chip->reg_lock);
	oxygen_write8_masked(chip, OXYGEN_REC_FORMAT,
	oxygen_format(hw_params) << OXYGEN_REC_FORMAT_A_SHIFT,
	OXYGEN_REC_FORMAT_A_MASK);
	oxygen_write16_masked(chip, OXYGEN_I2S_A_FORMAT,
	oxygen_rate(hw_params) \|
	oxygen_i2s_mclk(hw_params) \|
	chip->model->adc_i2s_format \|
	oxygen_i2s_bits(hw_params),
	OXYGEN_I2S_RATE_MASK \|
	OXYGEN_I2S_FORMAT_MASK \|
	OXYGEN_I2S_MCLK_MASK \|
	OXYGEN_I2S_BITS_MASK);
	spin_unlock_irq(&chip->reg_lock);

	mutex_lock(&chip->mutex);
	chip->model->set_adc_params(chip, hw_params);
	mutex_unlock(&chip->mutex);
	return 0;
	}

	static int oxygen_rec_b_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	int is_ac97;
	int err;

	err = oxygen_hw_params(substream, hw_params);
	if (err < 0)
	return err;

	is_ac97 = chip->has_ac97_1 &&
	(chip->model->pcm_dev_cfg & CAPTURE_2_FROM_AC97_1);

	spin_lock_irq(&chip->reg_lock);
	oxygen_write8_masked(chip, OXYGEN_REC_FORMAT,
	oxygen_format(hw_params) << OXYGEN_REC_FORMAT_B_SHIFT,
	OXYGEN_REC_FORMAT_B_MASK);
	if (!is_ac97)
	oxygen_write16_masked(chip, OXYGEN_I2S_B_FORMAT,
	oxygen_rate(hw_params) \|
	oxygen_i2s_mclk(hw_params) \|
	chip->model->adc_i2s_format \|
	oxygen_i2s_bits(hw_params),
	OXYGEN_I2S_RATE_MASK \|
	OXYGEN_I2S_FORMAT_MASK \|
	OXYGEN_I2S_MCLK_MASK \|
	OXYGEN_I2S_BITS_MASK);
	spin_unlock_irq(&chip->reg_lock);

	if (!is_ac97) {
	mutex_lock(&chip->mutex);
	chip->model->set_adc_params(chip, hw_params);
	mutex_unlock(&chip->mutex);
	}
	return 0;
	}

	static int oxygen_rec_c_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	int err;

	err = oxygen_hw_params(substream, hw_params);
	if (err < 0)
	return err;

	spin_lock_irq(&chip->reg_lock);
	oxygen_write8_masked(chip, OXYGEN_REC_FORMAT,
	oxygen_format(hw_params) << OXYGEN_REC_FORMAT_C_SHIFT,
	OXYGEN_REC_FORMAT_C_MASK);
	spin_unlock_irq(&chip->reg_lock);
	return 0;
	}

	static int oxygen_spdif_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	int err;

	err = oxygen_hw_params(substream, hw_params);
	if (err < 0)
	return err;

	spin_lock_irq(&chip->reg_lock);
	oxygen_clear_bits32(chip, OXYGEN_SPDIF_CONTROL,
	OXYGEN_SPDIF_OUT_ENABLE);
	oxygen_write8_masked(chip, OXYGEN_PLAY_FORMAT,
	oxygen_format(hw_params) << OXYGEN_SPDIF_FORMAT_SHIFT,
	OXYGEN_SPDIF_FORMAT_MASK);
	oxygen_write32_masked(chip, OXYGEN_SPDIF_CONTROL,
	oxygen_rate(hw_params) << OXYGEN_SPDIF_OUT_RATE_SHIFT,
	OXYGEN_SPDIF_OUT_RATE_MASK);
	oxygen_update_spdif_source(chip);
	spin_unlock_irq(&chip->reg_lock);
	return 0;
	}

	static int oxygen_multich_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *hw_params)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	int err;

	err = oxygen_hw_params(substream, hw_params);
	if (err < 0)
	return err;

	spin_lock_irq(&chip->reg_lock);
	oxygen_write8_masked(chip, OXYGEN_PLAY_CHANNELS,
	oxygen_play_channels(hw_params),
	OXYGEN_PLAY_CHANNELS_MASK);
	oxygen_write8_masked(chip, OXYGEN_PLAY_FORMAT,
	oxygen_format(hw_params) << OXYGEN_MULTICH_FORMAT_SHIFT,
	OXYGEN_MULTICH_FORMAT_MASK);
	oxygen_write16_masked(chip, OXYGEN_I2S_MULTICH_FORMAT,
	oxygen_rate(hw_params) \|
	chip->model->dac_i2s_format \|
	oxygen_i2s_bits(hw_params),
	OXYGEN_I2S_RATE_MASK \|
	OXYGEN_I2S_FORMAT_MASK \|
	OXYGEN_I2S_BITS_MASK);
	oxygen_update_dac_routing(chip);
	oxygen_update_spdif_source(chip);
	spin_unlock_irq(&chip->reg_lock);

	mutex_lock(&chip->mutex);
	chip->model->set_dac_params(chip, hw_params);
	mutex_unlock(&chip->mutex);
	return 0;
	}

	static int oxygen_hw_free(struct snd_pcm_substream *substream)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	unsigned int channel = oxygen_substream_channel(substream);

	spin_lock_irq(&chip->reg_lock);
	chip->interrupt_mask &= ~(1 << channel);
	oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, chip->interrupt_mask);
	spin_unlock_irq(&chip->reg_lock);

	return snd_pcm_lib_free_pages(substream);
	}

	static int oxygen_spdif_hw_free(struct snd_pcm_substream *substream)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);

	spin_lock_irq(&chip->reg_lock);
	oxygen_clear_bits32(chip, OXYGEN_SPDIF_CONTROL,
	OXYGEN_SPDIF_OUT_ENABLE);
	spin_unlock_irq(&chip->reg_lock);
	return oxygen_hw_free(substream);
	}

	static int oxygen_prepare(struct snd_pcm_substream *substream)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	unsigned int channel = oxygen_substream_channel(substream);
	unsigned int channel_mask = 1 << channel;

	spin_lock_irq(&chip->reg_lock);
	oxygen_set_bits8(chip, OXYGEN_DMA_FLUSH, channel_mask);
	oxygen_clear_bits8(chip, OXYGEN_DMA_FLUSH, channel_mask);

	chip->interrupt_mask \|= channel_mask;
	oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, chip->interrupt_mask);
	spin_unlock_irq(&chip->reg_lock);
	return 0;
	}

	static int oxygen_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_substream *s;
	unsigned int mask = 0;
	int pausing;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	pausing = 0;
	break;
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	pausing = 1;
	break;
	default:
	return -EINVAL;
	}

	snd_pcm_group_for_each_entry(s, substream) {
	if (snd_pcm_substream_chip(s) == chip) {
	mask \|= 1 << oxygen_substream_channel(s);
	snd_pcm_trigger_done(s, substream);
	}
	}

	spin_lock(&chip->reg_lock);
	if (!pausing) {
	if (cmd == SNDRV_PCM_TRIGGER_START)
	chip->pcm_running \|= mask;
	else
	chip->pcm_running &= ~mask;
	oxygen_write8(chip, OXYGEN_DMA_STATUS, chip->pcm_running);
	} else {
	if (cmd == SNDRV_PCM_TRIGGER_PAUSE_PUSH)
	oxygen_set_bits8(chip, OXYGEN_DMA_PAUSE, mask);
	else
	oxygen_clear_bits8(chip, OXYGEN_DMA_PAUSE, mask);
	}
	spin_unlock(&chip->reg_lock);
	return 0;
	}

	static snd_pcm_uframes_t oxygen_pointer(struct snd_pcm_substream *substream)
	{
	struct oxygen *chip = snd_pcm_substream_chip(substream);
	struct snd_pcm_runtime *runtime = substream->runtime;
	unsigned int channel = oxygen_substream_channel(substream);
	u32 curr_addr;

	/* no spinlock, this read should be atomic */
	curr_addr = oxygen_read32(chip, channel_base_registers[channel]);
	return bytes_to_frames(runtime, curr_addr - (u32)runtime->dma_addr);
	}

	static struct snd_pcm_ops oxygen_rec_a_ops = {
	.open = oxygen_rec_a_open,
	.close = oxygen_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = oxygen_rec_a_hw_params,
	.hw_free = oxygen_hw_free,
	.prepare = oxygen_prepare,
	.trigger = oxygen_trigger,
	.pointer = oxygen_pointer,
	};

	static struct snd_pcm_ops oxygen_rec_b_ops = {
	.open = oxygen_rec_b_open,
	.close = oxygen_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = oxygen_rec_b_hw_params,
	.hw_free = oxygen_hw_free,
	.prepare = oxygen_prepare,
	.trigger = oxygen_trigger,
	.pointer = oxygen_pointer,
	};

	static struct snd_pcm_ops oxygen_rec_c_ops = {
	.open = oxygen_rec_c_open,
	.close = oxygen_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = oxygen_rec_c_hw_params,
	.hw_free = oxygen_hw_free,
	.prepare = oxygen_prepare,
	.trigger = oxygen_trigger,
	.pointer = oxygen_pointer,
	};

	static struct snd_pcm_ops oxygen_spdif_ops = {
	.open = oxygen_spdif_open,
	.close = oxygen_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = oxygen_spdif_hw_params,
	.hw_free = oxygen_spdif_hw_free,
	.prepare = oxygen_prepare,
	.trigger = oxygen_trigger,
	.pointer = oxygen_pointer,
	};

	static struct snd_pcm_ops oxygen_multich_ops = {
	.open = oxygen_multich_open,
	.close = oxygen_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = oxygen_multich_hw_params,
	.hw_free = oxygen_hw_free,
	.prepare = oxygen_prepare,
	.trigger = oxygen_trigger,
	.pointer = oxygen_pointer,
	};

	static struct snd_pcm_ops oxygen_ac97_ops = {
	.open = oxygen_ac97_open,
	.close = oxygen_close,
	.ioctl = snd_pcm_lib_ioctl,
	.hw_params = oxygen_hw_params,
	.hw_free = oxygen_hw_free,
	.prepare = oxygen_prepare,
	.trigger = oxygen_trigger,
	.pointer = oxygen_pointer,
	};

	static void oxygen_pcm_free(struct snd_pcm *pcm)
	{
	snd_pcm_lib_preallocate_free_for_all(pcm);
	}

	int oxygen_pcm_init(struct oxygen *chip)
	{
	struct snd_pcm *pcm;
	int outs, ins;
	int err;

	outs = !!(chip->model->pcm_dev_cfg & PLAYBACK_0_TO_I2S);
	ins = !!(chip->model->pcm_dev_cfg & (CAPTURE_0_FROM_I2S_1 \|
	CAPTURE_0_FROM_I2S_2));
	if (outs \| ins) {
	err = snd_pcm_new(chip->card, "Analog", 0, outs, ins, &pcm);
	if (err < 0)
	return err;
	if (outs)
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
	&oxygen_multich_ops);
	if (chip->model->pcm_dev_cfg & CAPTURE_0_FROM_I2S_1)
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
	&oxygen_rec_a_ops);
	else if (chip->model->pcm_dev_cfg & CAPTURE_0_FROM_I2S_2)
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
	&oxygen_rec_b_ops);
	pcm->private_data = chip;
	pcm->private_free = oxygen_pcm_free;
	strcpy(pcm->name, "Analog");
	if (outs)
	snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream,
	SNDRV_DMA_TYPE_DEV,
	snd_dma_pci_data(chip->pci),
	DEFAULT_BUFFER_BYTES_MULTICH,
	BUFFER_BYTES_MAX_MULTICH);
	if (ins)
	snd_pcm_lib_preallocate_pages(pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream,
	SNDRV_DMA_TYPE_DEV,
	snd_dma_pci_data(chip->pci),
	DEFAULT_BUFFER_BYTES,
	BUFFER_BYTES_MAX);
	}

	outs = !!(chip->model->pcm_dev_cfg & PLAYBACK_1_TO_SPDIF);
	ins = !!(chip->model->pcm_dev_cfg & CAPTURE_1_FROM_SPDIF);
	if (outs \| ins) {
	err = snd_pcm_new(chip->card, "Digital", 1, outs, ins, &pcm);
	if (err < 0)
	return err;
	if (outs)
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
	&oxygen_spdif_ops);
	if (ins)
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
	&oxygen_rec_c_ops);
	pcm->private_data = chip;
	pcm->private_free = oxygen_pcm_free;
	strcpy(pcm->name, "Digital");
	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
	snd_dma_pci_data(chip->pci),
	DEFAULT_BUFFER_BYTES,
	BUFFER_BYTES_MAX);
	}

	if (chip->has_ac97_1) {
	outs = !!(chip->model->pcm_dev_cfg & PLAYBACK_2_TO_AC97_1);
	ins = !!(chip->model->pcm_dev_cfg & CAPTURE_2_FROM_AC97_1);
	} else {
	outs = 0;
	ins = !!(chip->model->pcm_dev_cfg & CAPTURE_2_FROM_I2S_2);
	}
	if (outs \| ins) {
	err = snd_pcm_new(chip->card, outs ? "AC97" : "Analog2",
	2, outs, ins, &pcm);
	if (err < 0)
	return err;
	if (outs) {
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
	&oxygen_ac97_ops);
	oxygen_write8_masked(chip, OXYGEN_REC_ROUTING,
	OXYGEN_REC_B_ROUTE_AC97_1,
	OXYGEN_REC_B_ROUTE_MASK);
	}
	if (ins)
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
	&oxygen_rec_b_ops);
	pcm->private_data = chip;
	pcm->private_free = oxygen_pcm_free;
	strcpy(pcm->name, outs ? "Front Panel" : "Analog 2");
	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
	snd_dma_pci_data(chip->pci),
	DEFAULT_BUFFER_BYTES,
	BUFFER_BYTES_MAX);
	}
	return 0;
	}