Quelle  p16v.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright (c) by James Courtier-Dutton <James@superbug.demon.co.uk>
 *  Driver p16v chips
 *  Version: 0.25
 *
 *  FEATURES currently supported:
 *    Output fixed at S32_LE, 2 channel to hw:0,0
 *    Rates: 44.1, 48, 96, 192.
 *
 *  Changelog:
 *  0.8
 *    Use separate card based buffer for periods table.
 *  0.9
 *    Use 2 channel output streams instead of 8 channel.
 *       (8 channel output streams might be good for ASIO type output)
 *    Corrected speaker output, so Front -> Front etc.
 *  0.10
 *    Fixed missed interrupts.
 *  0.11
 *    Add Sound card model number and names.
 *    Add Analog volume controls.
 *  0.12
 *    Corrected playback interrupts. Now interrupt per period, instead of half period.
 *  0.13
 *    Use single trigger for multichannel.
 *  0.14
 *    Mic capture now works at fixed: S32_LE, 96000Hz, Stereo.
 *  0.15
 *    Force buffer_size / period_size == INTEGER.
 *  0.16
 *    Update p16v.c to work with changed alsa api.
 *  0.17
 *    Update p16v.c to work with changed alsa api. Removed boot_devs.
 *  0.18
 *    Merging with snd-emu10k1 driver.
 *  0.19
 *    One stereo channel at 24bit now works.
 *  0.20
 *    Added better register defines.
 *  0.21
 *    Integrated with snd-emu10k1 driver.
 *  0.22
 *    Removed #if 0 ... #endif
 *  0.23
 *    Implement different capture rates.
 *  0.24
 *    Implement different capture source channels.
 *    e.g. When HD Capture source is set to SPDIF,
 *    setting HD Capture channel to 0 captures from CDROM digital input.
 *    setting HD Capture channel to 1 captures from SPDIF in.
 *  0.25
 *    Include capture buffer sizes.
 *
 *  BUGS:
 *    Some stability problems when unloading the snd-p16v kernel module.
 *    --
 *
 *  TODO:
 *    SPDIF out.
 *    Find out how to change capture sample rates. E.g. To record SPDIF at 48000Hz.
 *    Currently capture fixed at 48000Hz.
 *
 *    --
 *  GENERAL INFO:
 *    Model: SB0240
 *    P16V Chip: CA0151-DBS
 *    Audigy 2 Chip: CA0102-IAT
 *    AC97 Codec: STAC 9721
 *    ADC: Philips 1361T (Stereo 24bit)
 *    DAC: CS4382-K (8-channel, 24bit, 192Khz)
 *
 *  This code was initially based on code from ALSA's emu10k1x.c which is:
 *  Copyright (c) by Francisco Moraes <fmoraes@nc.rr.com>
 */
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/info.h>
#include <sound/tlv.h>
#include <sound/emu10k1.h>
#include "p16v.h"

#define SET_CHANNEL 0  /* Testing channel outputs 0=Front, 1=Center/LFE, 2=Unknown, 3=Rear */
#define PCM_FRONT_CHANNEL 0
#define PCM_REAR_CHANNEL 1
#define PCM_CENTER_LFE_CHANNEL 2
#define PCM_SIDE_CHANNEL 3
#define CONTROL_FRONT_CHANNEL 0
#define CONTROL_REAR_CHANNEL 3
#define CONTROL_CENTER_LFE_CHANNEL 1
#define CONTROL_SIDE_CHANNEL 2

/* Card IDs:
 * Class 0401: 1102:0004 (rev 04) Subsystem: 1102:2002 -> Audigy2 ZS 7.1 Model:SB0350
 * Class 0401: 1102:0004 (rev 04) Subsystem: 1102:1007 -> Audigy2 6.1    Model:SB0240
 * Class 0401: 1102:0004 (rev 04) Subsystem: 1102:1002 -> Audigy2 Platinum  Model:SB msb0240230009266
 * Class 0401: 1102:0004 (rev 04) Subsystem: 1102:2007 -> Audigy4 Pro Model:SB0380 M1SB0380472001901E
 *
 */

 /* hardware definition */
static const struct snd_pcm_hardware snd_p16v_playback_hw = {
 .info =   SNDRV_PCM_INFO_MMAP | 
    SNDRV_PCM_INFO_INTERLEAVED |
    SNDRV_PCM_INFO_BLOCK_TRANSFER |
    SNDRV_PCM_INFO_RESUME |
    SNDRV_PCM_INFO_MMAP_VALID |
    SNDRV_PCM_INFO_SYNC_START,
 .formats =  SNDRV_PCM_FMTBIT_S32_LE, /* Only supports 24-bit samples padded to 32 bits. */
 .rates =  SNDRV_PCM_RATE_192000 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_44100, 
 .rate_min =  44100,
 .rate_max =  192000,
 .channels_min =  8, 
 .channels_max =  8,
 .buffer_bytes_max = ((65536 - 64) * 8),
 .period_bytes_min = 64,
 .period_bytes_max = (65536 - 64),
 .periods_min =  2,
 .periods_max =  8,
 .fifo_size =  0,
};

static const struct snd_pcm_hardware snd_p16v_capture_hw = {
 .info =   (SNDRV_PCM_INFO_MMAP |
     SNDRV_PCM_INFO_INTERLEAVED |
     SNDRV_PCM_INFO_BLOCK_TRANSFER |
     SNDRV_PCM_INFO_RESUME |
     SNDRV_PCM_INFO_MMAP_VALID),
 .formats =  SNDRV_PCM_FMTBIT_S32_LE,
 .rates =  SNDRV_PCM_RATE_192000 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_44100, 
 .rate_min =  44100,
 .rate_max =  192000,
 .channels_min =  2,
 .channels_max =  2,
 .buffer_bytes_max = (65536 - 64),
 .period_bytes_min = 64,
 .period_bytes_max = (65536 - 128) >> 1,  /* size has to be N*64 bytes */
 .periods_min =  2,
 .periods_max =  2,
 .fifo_size =  0,
};

/* open_playback callback */
static int snd_p16v_pcm_open_playback_channel(struct snd_pcm_substream *substream, int channel_id)
{
 struct snd_pcm_runtime *runtime = substream->runtime;
 int err;

 /*
dev_dbg(emu->card->dev, "epcm device=%d, channel_id=%d\n",
   substream->pcm->device, channel_id);
*/
  
 runtime->hw = snd_p16v_playback_hw;

#if 0 /* debug */
 dev_dbg(emu->card->dev,
     "p16v: open channel_id=%d, channel=%p, use=0x%x\n",
     channel_id, channel, channel->use);
 dev_dbg(emu->card->dev, "open:channel_id=%d, chip=%p, channel=%p\n",
        channel_id, chip, channel);
#endif /* debug */
 /* channel->interrupt = snd_p16v_pcm_channel_interrupt; */
 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 if (err < 0)
                return err;

 return 0;
}

/* open_capture callback */
static int snd_p16v_pcm_open_capture_channel(struct snd_pcm_substream *substream, int channel_id)
{
 struct snd_pcm_runtime *runtime = substream->runtime;
 int err;

 /*
dev_dbg(emu->card->dev, "epcm device=%d, channel_id=%d\n",
   substream->pcm->device, channel_id);
*/
  
 runtime->hw = snd_p16v_capture_hw;

 err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
 if (err < 0)
  return err;

 return 0;
}


/* close callback */
static int snd_p16v_pcm_close_playback(struct snd_pcm_substream *substream)
{
 return 0;
}

/* close callback */
static int snd_p16v_pcm_close_capture(struct snd_pcm_substream *substream)
{
 return 0;
}

static int snd_p16v_pcm_open_playback_front(struct snd_pcm_substream *substream)
{
 return snd_p16v_pcm_open_playback_channel(substream, PCM_FRONT_CHANNEL);
}

static int snd_p16v_pcm_open_capture(struct snd_pcm_substream *substream)
{
 // Only using channel 0 for now, but the card has 2 channels.
 return snd_p16v_pcm_open_capture_channel(substream, 0);
}

static int snd_p16v_pcm_ioctl_playback(struct snd_pcm_substream *substream,
           unsigned int cmd, void *arg)
{
 if (cmd == SNDRV_PCM_IOCTL1_SYNC_ID) {
  static const unsigned char id[4] = { 'P', '1', '6', 'V' };
  snd_pcm_set_sync_per_card(substream, arg, id, 4);
  return 0;
 }
 return snd_pcm_lib_ioctl(substream, cmd, arg);
}

/* prepare playback callback */
static int snd_p16v_pcm_prepare_playback(struct snd_pcm_substream *substream)
{
 struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
 struct snd_pcm_runtime *runtime = substream->runtime;
 int channel = substream->pcm->device - emu->p16v_device_offset;
 u32 *table_base = (u32 *)(emu->p16v_buffer->area+(8*16*channel));
 u32 period_size_bytes = frames_to_bytes(runtime, runtime->period_size);
 int i;
 u32 tmp;
 
#if 0 /* debug */
 dev_dbg(emu->card->dev,
  "prepare:channel_number=%d, rate=%d, "
     "format=0x%x, channels=%d, buffer_size=%ld, "
     "period_size=%ld, periods=%u, frames_to_bytes=%d\n",
     channel, runtime->rate, runtime->format, runtime->channels,
     runtime->buffer_size, runtime->period_size,
     runtime->periods, frames_to_bytes(runtime, 1));
 dev_dbg(emu->card->dev,
  "dma_addr=%x, dma_area=%p, table_base=%p\n",
     runtime->dma_addr, runtime->dma_area, table_base);
 dev_dbg(emu->card->dev,
  "dma_addr=%x, dma_area=%p, dma_bytes(size)=%x\n",
     emu->p16v_buffer->addr, emu->p16v_buffer->area,
     emu->p16v_buffer->bytes);
#endif /* debug */
 tmp = snd_emu10k1_ptr_read(emu, A_SPDIF_SAMPLERATE, channel);
 tmp &= ~(A_SPDIF_RATE_MASK | A_EHC_SRC48_MASK);
        switch (runtime->rate) {
 case 44100:
   snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel,
    tmp | A_SPDIF_44100 | A_EHC_SRC48_44);
   break;
 case 96000:
   snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel,
    tmp | A_SPDIF_96000 | A_EHC_SRC48_96);
   break;
 case 192000:
   snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel,
    tmp | A_SPDIF_192000 | A_EHC_SRC48_192);
   break;
 case 48000:
 default:
   snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel,
    tmp | A_SPDIF_48000 | A_EHC_SRC48_BYPASS);
   break;
 }
 /* FIXME: Check emu->buffer.size before actually writing to it. */
 for(i = 0; i < runtime->periods; i++) {
  table_base[i*2]=runtime->dma_addr+(i*period_size_bytes);
  table_base[(i*2)+1]=period_size_bytes<<16;
 }
 
 snd_emu10k1_ptr20_write(emu, PLAYBACK_LIST_ADDR, channel, emu->p16v_buffer->addr+(8*16*channel));
 snd_emu10k1_ptr20_write(emu, PLAYBACK_LIST_SIZE, channel, (runtime->periods - 1) << 19);
 snd_emu10k1_ptr20_write(emu, PLAYBACK_LIST_PTR, channel, 0);
 snd_emu10k1_ptr20_write(emu, PLAYBACK_DMA_ADDR, channel, runtime->dma_addr);
 //snd_emu10k1_ptr20_write(emu, PLAYBACK_PERIOD_SIZE, channel, frames_to_bytes(runtime, runtime->period_size)<<16); // buffer size in bytes
 snd_emu10k1_ptr20_write(emu, PLAYBACK_PERIOD_SIZE, channel, 0); // buffer size in bytes
 snd_emu10k1_ptr20_write(emu, PLAYBACK_POINTER, channel, 0);
 snd_emu10k1_ptr20_write(emu, PLAYBACK_FIFO_END_ADDRESS, channel, 0);
 snd_emu10k1_ptr20_write(emu, PLAYBACK_FIFO_POINTER, channel, 0);

 return 0;
}

/* prepare capture callback */
static int snd_p16v_pcm_prepare_capture(struct snd_pcm_substream *substream)
{
 struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
 struct snd_pcm_runtime *runtime = substream->runtime;
 int channel = substream->pcm->device - emu->p16v_device_offset;

 /*
dev_dbg(emu->card->dev, "prepare capture:channel_number=%d, rate=%d, "
       "format=0x%x, channels=%d, buffer_size=%ld, period_size=%ld, "
       "frames_to_bytes=%d\n",
       channel, runtime->rate, runtime->format, runtime->channels,
       runtime->buffer_size, runtime->period_size,
       frames_to_bytes(runtime, 1));
*/
        switch (runtime->rate) {
 case 44100:
   snd_emu10k1_ptr_write(emu, A_I2S_CAPTURE_RATE, channel, A_I2S_CAPTURE_44100);
   break;
 case 96000:
   snd_emu10k1_ptr_write(emu, A_I2S_CAPTURE_RATE, channel, A_I2S_CAPTURE_96000);
   break;
 case 192000:
   snd_emu10k1_ptr_write(emu, A_I2S_CAPTURE_RATE, channel, A_I2S_CAPTURE_192000);
   break;
 case 48000:
 default:
   snd_emu10k1_ptr_write(emu, A_I2S_CAPTURE_RATE, channel, A_I2S_CAPTURE_48000);
   break;
 }
 /* FIXME: Check emu->buffer.size before actually writing to it. */
 snd_emu10k1_ptr20_write(emu, CAPTURE_FIFO_POINTER, channel, 0);
 snd_emu10k1_ptr20_write(emu, CAPTURE_DMA_ADDR, channel, runtime->dma_addr);
 snd_emu10k1_ptr20_write(emu, CAPTURE_BUFFER_SIZE, channel, frames_to_bytes(runtime, runtime->buffer_size) << 16); // buffer size in bytes
 snd_emu10k1_ptr20_write(emu, CAPTURE_POINTER, channel, 0);
 //snd_emu10k1_ptr20_write(emu, CAPTURE_SOURCE, 0x0, 0x333300e4); /* Select MIC or Line in */
 //snd_emu10k1_ptr20_write(emu, EXTENDED_INT_MASK, 0, snd_emu10k1_ptr20_read(emu, EXTENDED_INT_MASK, 0) | (0x110000<<channel));

 return 0;
}

static void snd_p16v_intr_enable(struct snd_emu10k1 *emu, unsigned int intrenb)
{
 unsigned long flags;
 unsigned int enable;

 spin_lock_irqsave(&emu->emu_lock, flags);
 enable = inl(emu->port + INTE2) | intrenb;
 outl(enable, emu->port + INTE2);
 spin_unlock_irqrestore(&emu->emu_lock, flags);
}

static void snd_p16v_intr_disable(struct snd_emu10k1 *emu, unsigned int intrenb)
{
 unsigned long flags;
 unsigned int disable;

 spin_lock_irqsave(&emu->emu_lock, flags);
 disable = inl(emu->port + INTE2) & (~intrenb);
 outl(disable, emu->port + INTE2);
 spin_unlock_irqrestore(&emu->emu_lock, flags);
}

static void snd_p16v_interrupt(struct snd_emu10k1 *emu)
{
 unsigned int status;

 while ((status = inl(emu->port + IPR2)) != 0) {
  u32 mask = INTE2_PLAYBACK_CH_0_LOOP;  /* Full Loop */

  /* dev_dbg(emu->card->dev, "p16v status=0x%x\n", status); */
  if (status & mask) {
   struct snd_pcm_substream *substream =
     emu->pcm_p16v->streams[SNDRV_PCM_STREAM_PLAYBACK].substream;
   struct snd_pcm_runtime *runtime = substream->runtime;

   if (runtime && runtime->private_data) {
    snd_pcm_period_elapsed(substream);
   } else {
    dev_err(emu->card->dev,
     "p16v: status: 0x%08x, mask=0x%08x\n",
     status, mask);
   }
  }
  if (status & 0x110000) {
   struct snd_pcm_substream *substream =
     emu->pcm_p16v->streams[SNDRV_PCM_STREAM_CAPTURE].substream;
   struct snd_pcm_runtime *runtime = substream->runtime;

   /* dev_info(emu->card->dev, "capture int found\n"); */
   if (runtime && runtime->private_data) {
    /* dev_info(emu->card->dev, "capture period_elapsed\n"); */
    snd_pcm_period_elapsed(substream);
   }
  }
  outl(status, emu->port + IPR2); /* ack all */
 }
}

/* trigger_playback callback */
static int snd_p16v_pcm_trigger_playback(struct snd_pcm_substream *substream,
        int cmd)
{
 struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
 struct snd_pcm_runtime *runtime;
 int channel;
 int result = 0;
        struct snd_pcm_substream *s;
 u32 basic = 0;
 u32 inte = 0;
 int running = 0;

 switch (cmd) {
 case SNDRV_PCM_TRIGGER_START:
  running=1;
  break;
 case SNDRV_PCM_TRIGGER_STOP:
 default:
  running = 0;
  break;
 }
        snd_pcm_group_for_each_entry(s, substream) {
  if (snd_pcm_substream_chip(s) != emu ||
      s->stream != SNDRV_PCM_STREAM_PLAYBACK)
   continue;
  runtime = s->runtime;
  channel = substream->pcm->device-emu->p16v_device_offset;
  /* dev_dbg(emu->card->dev, "p16v channel=%d\n", channel); */
  runtime->private_data = (void *)(ptrdiff_t)running;
  basic |= (0x1<<channel);
  inte |= (INTE2_PLAYBACK_CH_0_LOOP<<channel);
                snd_pcm_trigger_done(s, substream);
        }
 /* dev_dbg(emu->card->dev, "basic=0x%x, inte=0x%x\n", basic, inte); */

 switch (cmd) {
 case SNDRV_PCM_TRIGGER_START:
  snd_p16v_intr_enable(emu, inte);
  snd_emu10k1_ptr20_write(emu, BASIC_INTERRUPT, 0, snd_emu10k1_ptr20_read(emu, BASIC_INTERRUPT, 0)| (basic));
  break;
 case SNDRV_PCM_TRIGGER_STOP:
  snd_emu10k1_ptr20_write(emu, BASIC_INTERRUPT, 0, snd_emu10k1_ptr20_read(emu, BASIC_INTERRUPT, 0) & ~(basic));
  snd_p16v_intr_disable(emu, inte);
  break;
 default:
  result = -EINVAL;
  break;
 }
 return result;
}

/* trigger_capture callback */
static int snd_p16v_pcm_trigger_capture(struct snd_pcm_substream *substream,
                                   int cmd)
{
 struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
 struct snd_pcm_runtime *runtime = substream->runtime;
 int channel = 0;
 int result = 0;
 u32 inte = INTE2_CAPTURE_CH_0_LOOP | INTE2_CAPTURE_CH_0_HALF_LOOP;

 switch (cmd) {
 case SNDRV_PCM_TRIGGER_START:
  snd_p16v_intr_enable(emu, inte);
  snd_emu10k1_ptr20_write(emu, BASIC_INTERRUPT, 0, snd_emu10k1_ptr20_read(emu, BASIC_INTERRUPT, 0)|(0x100<<channel));
  runtime->private_data = (void *)1;
  break;
 case SNDRV_PCM_TRIGGER_STOP:
  snd_emu10k1_ptr20_write(emu, BASIC_INTERRUPT, 0, snd_emu10k1_ptr20_read(emu, BASIC_INTERRUPT, 0) & ~(0x100<<channel));
  snd_p16v_intr_disable(emu, inte);
  //snd_emu10k1_ptr20_write(emu, EXTENDED_INT_MASK, 0, snd_emu10k1_ptr20_read(emu, EXTENDED_INT_MASK, 0) & ~(0x110000<<channel));
  runtime->private_data = NULL;
  break;
 default:
  result = -EINVAL;
  break;
 }
 return result;
}

/* pointer_playback callback */
static snd_pcm_uframes_t
snd_p16v_pcm_pointer_playback(struct snd_pcm_substream *substream)
{
 struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
 struct snd_pcm_runtime *runtime = substream->runtime;
 snd_pcm_uframes_t ptr, ptr1, ptr2,ptr3,ptr4 = 0;
 int channel = substream->pcm->device - emu->p16v_device_offset;

 if (!runtime->private_data)
  return 0;

 ptr3 = snd_emu10k1_ptr20_read(emu, PLAYBACK_LIST_PTR, channel);
 ptr1 = snd_emu10k1_ptr20_read(emu, PLAYBACK_POINTER, channel);
 ptr4 = snd_emu10k1_ptr20_read(emu, PLAYBACK_LIST_PTR, channel);
 if (ptr3 != ptr4) ptr1 = snd_emu10k1_ptr20_read(emu, PLAYBACK_POINTER, channel);
 ptr2 = bytes_to_frames(runtime, ptr1);
 ptr2+= (ptr4 >> 3) * runtime->period_size;
 ptr=ptr2;
        if (ptr >= runtime->buffer_size)
  ptr -= runtime->buffer_size;

 return ptr;
}

/* pointer_capture callback */
static snd_pcm_uframes_t
snd_p16v_pcm_pointer_capture(struct snd_pcm_substream *substream)
{
 struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
 struct snd_pcm_runtime *runtime = substream->runtime;
 snd_pcm_uframes_t ptr, ptr1, ptr2 = 0;
 int channel = 0;

 if (!runtime->private_data)
  return 0;

 ptr1 = snd_emu10k1_ptr20_read(emu, CAPTURE_POINTER, channel);
 ptr2 = bytes_to_frames(runtime, ptr1);
 ptr=ptr2;
 if (ptr >= runtime->buffer_size) {
  ptr -= runtime->buffer_size;
  dev_warn(emu->card->dev, "buffer capture limited!\n");
 }
 /*
dev_dbg(emu->card->dev, "ptr1 = 0x%lx, ptr2=0x%lx, ptr=0x%lx, "
       "buffer_size = 0x%x, period_size = 0x%x, bits=%d, rate=%d\n",
       ptr1, ptr2, ptr, (int)runtime->buffer_size,
       (int)runtime->period_size, (int)runtime->frame_bits,
       (int)runtime->rate);
*/
 return ptr;
}

/* operators */
static const struct snd_pcm_ops snd_p16v_playback_front_ops = {
 .open =        snd_p16v_pcm_open_playback_front,
 .close =       snd_p16v_pcm_close_playback,
 .ioctl =       snd_p16v_pcm_ioctl_playback,
 .prepare =     snd_p16v_pcm_prepare_playback,
 .trigger =     snd_p16v_pcm_trigger_playback,
 .pointer =     snd_p16v_pcm_pointer_playback,
};

static const struct snd_pcm_ops snd_p16v_capture_ops = {
 .open =        snd_p16v_pcm_open_capture,
 .close =       snd_p16v_pcm_close_capture,
 .prepare =     snd_p16v_pcm_prepare_capture,
 .trigger =     snd_p16v_pcm_trigger_capture,
 .pointer =     snd_p16v_pcm_pointer_capture,
};

int snd_p16v_pcm(struct snd_emu10k1 *emu, int device)
{
 struct snd_pcm *pcm;
 struct snd_pcm_substream *substream;
 int err;
        int capture=1;
  
 /* dev_dbg(emu->card->dev, "snd_p16v_pcm called. device=%d\n", device); */
 emu->p16v_device_offset = device;

 err = snd_pcm_new(emu->card, "p16v", device, 1, capture, &pcm);
 if (err < 0)
  return err;
  
 pcm->private_data = emu;
 // Single playback 8 channel device.
 // Single capture 2 channel device.
 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_p16v_playback_front_ops);
 snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_p16v_capture_ops);

 pcm->info_flags = 0;
 pcm->dev_subclass = SNDRV_PCM_SUBCLASS_GENERIC_MIX;
 strscpy(pcm->name, "p16v");
 emu->pcm_p16v = pcm;
 emu->p16v_interrupt = snd_p16v_interrupt;

 for(substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 
     substream; 
     substream = substream->next) {
  snd_pcm_set_managed_buffer(substream, SNDRV_DMA_TYPE_DEV,
        &emu->pci->dev,
        (65536 - 64) * 8,
        (65536 - 64) * 8);
  /*
dev_dbg(emu->card->dev,
   "preallocate playback substream: err=%d\n", err);
*/
 }

 for (substream = pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream; 
       substream; 
       substream = substream->next) {
  snd_pcm_set_managed_buffer(substream, SNDRV_DMA_TYPE_DEV,
        &emu->pci->dev,
        65536 - 64, 65536 - 64);
  /*
dev_dbg(emu->card->dev,
   "preallocate capture substream: err=%d\n", err);
*/
 }
  
 return 0;
}

static int snd_p16v_volume_info(struct snd_kcontrol *kcontrol,
    struct snd_ctl_elem_info *uinfo)
{
        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
        uinfo->count = 2;
        uinfo->value.integer.min = 0;
        uinfo->value.integer.max = 255;
        return 0;
}

static int snd_p16v_volume_get(struct snd_kcontrol *kcontrol,
          struct snd_ctl_elem_value *ucontrol)
{
        struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
 int high_low = (kcontrol->private_value >> 8) & 0xff;
 int reg = kcontrol->private_value & 0xff;
 u32 value;

 value = snd_emu10k1_ptr20_read(emu, reg, high_low);
 if (high_low) {
  ucontrol->value.integer.value[0] = 0xff - ((value >> 24) & 0xff); /* Left */
  ucontrol->value.integer.value[1] = 0xff - ((value >> 16) & 0xff); /* Right */
 } else {
  ucontrol->value.integer.value[0] = 0xff - ((value >> 8) & 0xff); /* Left */
  ucontrol->value.integer.value[1] = 0xff - ((value >> 0) & 0xff); /* Right */
 }
 return 0;
}

static int snd_p16v_volume_put(struct snd_kcontrol *kcontrol,
          struct snd_ctl_elem_value *ucontrol)
{
        struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
 int high_low = (kcontrol->private_value >> 8) & 0xff;
 int reg = kcontrol->private_value & 0xff;
        u32 value, oval;

 oval = value = snd_emu10k1_ptr20_read(emu, reg, 0);
 if (high_low == 1) {
  value &= 0xffff;
  value |= ((0xff - ucontrol->value.integer.value[0]) << 24) |
   ((0xff - ucontrol->value.integer.value[1]) << 16);
 } else {
  value &= 0xffff0000;
  value |= ((0xff - ucontrol->value.integer.value[0]) << 8) |
   ((0xff - ucontrol->value.integer.value[1]) );
 }
 if (value != oval) {
  snd_emu10k1_ptr20_write(emu, reg, 0, value);
  return 1;
 }
 return 0;
}

static int snd_p16v_capture_source_info(struct snd_kcontrol *kcontrol,
     struct snd_ctl_elem_info *uinfo)
{
 static const char * const texts[8] = {
  "SPDIF", "I2S", "SRC48", "SRCMulti_SPDIF", "SRCMulti_I2S",
  "CDIF", "FX", "AC97"
 };

 return snd_ctl_enum_info(uinfo, 1, 8, texts);
}

static int snd_p16v_capture_source_get(struct snd_kcontrol *kcontrol,
     struct snd_ctl_elem_value *ucontrol)
{
 struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);

 ucontrol->value.enumerated.item[0] = emu->p16v_capture_source;
 return 0;
}

static int snd_p16v_capture_source_put(struct snd_kcontrol *kcontrol,
     struct snd_ctl_elem_value *ucontrol)
{
 struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
 unsigned int val;
 int change = 0;
 u32 mask;
 u32 source;

 val = ucontrol->value.enumerated.item[0] ;
 if (val > 7)
  return -EINVAL;
 change = (emu->p16v_capture_source != val);
 if (change) {
  emu->p16v_capture_source = val;
  source = (val << 28) | (val << 24) | (val << 20) | (val << 16);
  mask = snd_emu10k1_ptr20_read(emu, BASIC_INTERRUPT, 0) & 0xffff;
  snd_emu10k1_ptr20_write(emu, BASIC_INTERRUPT, 0, source | mask);
 }
        return change;
}

static int snd_p16v_capture_channel_info(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_info *uinfo)
{
 static const char * const texts[4] = { "0", "1", "2", "3", };

 return snd_ctl_enum_info(uinfo, 1, 4, texts);
}

static int snd_p16v_capture_channel_get(struct snd_kcontrol *kcontrol,
     struct snd_ctl_elem_value *ucontrol)
{
 struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);

 ucontrol->value.enumerated.item[0] = emu->p16v_capture_channel;
 return 0;
}

static int snd_p16v_capture_channel_put(struct snd_kcontrol *kcontrol,
     struct snd_ctl_elem_value *ucontrol)
{
 struct snd_emu10k1 *emu = snd_kcontrol_chip(kcontrol);
 unsigned int val;
 int change = 0;
 u32 tmp;

 val = ucontrol->value.enumerated.item[0] ;
 if (val > 3)
  return -EINVAL;
 change = (emu->p16v_capture_channel != val);
 if (change) {
  emu->p16v_capture_channel = val;
  tmp = snd_emu10k1_ptr20_read(emu, CAPTURE_P16V_SOURCE, 0) & 0xfffc;
  snd_emu10k1_ptr20_write(emu, CAPTURE_P16V_SOURCE, 0, tmp | val);
 }
        return change;
}
static const DECLARE_TLV_DB_SCALE(snd_p16v_db_scale1, -5175, 25, 1);

#define P16V_VOL(xname,xreg,xhl) { \
 .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, \
        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |             \
                  SNDRV_CTL_ELEM_ACCESS_TLV_READ,               \
 .info = snd_p16v_volume_info, \
 .get = snd_p16v_volume_get, \
 .put = snd_p16v_volume_put, \
 .tlv = { .p = snd_p16v_db_scale1 }, \
 .private_value = ((xreg) | ((xhl) << 8)) \
}

static const struct snd_kcontrol_new p16v_mixer_controls[] = {
 P16V_VOL("HD Analog Front Playback Volume", PLAYBACK_VOLUME_MIXER9, 0),
 P16V_VOL("HD Analog Rear Playback Volume", PLAYBACK_VOLUME_MIXER10, 1),
 P16V_VOL("HD Analog Center/LFE Playback Volume", PLAYBACK_VOLUME_MIXER9, 1),
 P16V_VOL("HD Analog Side Playback Volume", PLAYBACK_VOLUME_MIXER10, 0),
 P16V_VOL("HD SPDIF Front Playback Volume", PLAYBACK_VOLUME_MIXER7, 0),
 P16V_VOL("HD SPDIF Rear Playback Volume", PLAYBACK_VOLUME_MIXER8, 1),
 P16V_VOL("HD SPDIF Center/LFE Playback Volume", PLAYBACK_VOLUME_MIXER7, 1),
 P16V_VOL("HD SPDIF Side Playback Volume", PLAYBACK_VOLUME_MIXER8, 0),
 {
  .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  .name =  "HD source Capture",
  .info =  snd_p16v_capture_source_info,
  .get =  snd_p16v_capture_source_get,
  .put =  snd_p16v_capture_source_put
 },
 {
  .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  .name =  "HD channel Capture",
  .info =  snd_p16v_capture_channel_info,
  .get =  snd_p16v_capture_channel_get,
  .put =  snd_p16v_capture_channel_put
 },
};


int snd_p16v_mixer(struct snd_emu10k1 *emu)
{
 int i, err;
        struct snd_card *card = emu->card;

 for (i = 0; i < ARRAY_SIZE(p16v_mixer_controls); i++) {
  err = snd_ctl_add(card, snd_ctl_new1(&p16v_mixer_controls[i], emu));
  if (err < 0)
   return err;
 }
        return 0;
}

#ifdef CONFIG_PM_SLEEP

#define NUM_CHS 1 /* up to 4, but only first channel is used */

int snd_p16v_alloc_pm_buffer(struct snd_emu10k1 *emu)
{
 emu->p16v_saved = vmalloc(array_size(NUM_CHS * 4, 0x80));
 if (! emu->p16v_saved)
  return -ENOMEM;
 return 0;
}

void snd_p16v_free_pm_buffer(struct snd_emu10k1 *emu)
{
 vfree(emu->p16v_saved);
}

void snd_p16v_suspend(struct snd_emu10k1 *emu)
{
 int i, ch;
 unsigned int *val;

 val = emu->p16v_saved;
 for (ch = 0; ch < NUM_CHS; ch++)
  for (i = 0; i < 0x80; i++, val++)
   *val = snd_emu10k1_ptr20_read(emu, i, ch);
}

void snd_p16v_resume(struct snd_emu10k1 *emu)
{
 int i, ch;
 unsigned int *val;

 val = emu->p16v_saved;
 for (ch = 0; ch < NUM_CHS; ch++)
  for (i = 0; i < 0x80; i++, val++)
   snd_emu10k1_ptr20_write(emu, i, ch, *val);
}
#endif