// 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,
};

static void snd_p16v_pcm_free_substream(struct snd_pcm_runtime *runtime)
{
        struct snd_emu10k1_pcm *epcm = runtime->private_data;

        kfree(epcm);
}

/* open_playback callback */
static int snd_p16v_pcm_open_playback_channel(struct snd_pcm_substream *substream, int channel_id)
{
        struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
        struct snd_emu10k1_voice *channel = &(emu->p16v_voices[channel_id]);
        struct snd_emu10k1_pcm *epcm;
        struct snd_pcm_runtime *runtime = substream->runtime;
        int err;

        epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
        /* dev_dbg(emu->card->dev, "epcm kcalloc: %p\n", epcm); */

        if (epcm == NULL)
                return -ENOMEM;
        epcm->emu = emu;
        epcm->substream = substream;
        /*
        dev_dbg(emu->card->dev, "epcm device=%d, channel_id=%d\n",
                   substream->pcm->device, channel_id);
        */
        runtime->private_data = epcm;
        runtime->private_free = snd_p16v_pcm_free_substream;
  
        runtime->hw = snd_p16v_playback_hw;

        channel->emu = emu;
        channel->number = channel_id;

        channel->use=1;
#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; */
        channel->epcm = epcm;
        if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
                return err;

        runtime->sync.id32[0] = substream->pcm->card->number;
        runtime->sync.id32[1] = 'P';
        runtime->sync.id32[2] = 16;
        runtime->sync.id32[3] = 'V';

        return 0;
}
/* open_capture callback */
static int snd_p16v_pcm_open_capture_channel(struct snd_pcm_substream *substream, int channel_id)
{
        struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
        struct snd_emu10k1_voice *channel = &(emu->p16v_capture_voice);
        struct snd_emu10k1_pcm *epcm;
        struct snd_pcm_runtime *runtime = substream->runtime;
        int err;

        epcm = kzalloc(sizeof(*epcm), GFP_KERNEL);
        /* dev_dbg(emu->card->dev, "epcm kcalloc: %p\n", epcm); */

        if (epcm == NULL)
                return -ENOMEM;
        epcm->emu = emu;
        epcm->substream = substream;
        /*
        dev_dbg(emu->card->dev, "epcm device=%d, channel_id=%d\n",
                   substream->pcm->device, channel_id);
        */
        runtime->private_data = epcm;
        runtime->private_free = snd_p16v_pcm_free_substream;
  
        runtime->hw = snd_p16v_capture_hw;

        channel->emu = emu;
        channel->number = channel_id;

        channel->use=1;
#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; */
        channel->epcm = epcm;
        if ((err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
                return err;

        return 0;
}


/* close callback */
static int snd_p16v_pcm_close_playback(struct snd_pcm_substream *substream)
{
        struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
        //struct snd_pcm_runtime *runtime = substream->runtime;
        //struct snd_emu10k1_pcm *epcm = runtime->private_data;
        emu->p16v_voices[substream->pcm->device - emu->p16v_device_offset].use = 0;
        /* FIXME: maybe zero others */
        return 0;
}

/* close callback */
static int snd_p16v_pcm_close_capture(struct snd_pcm_substream *substream)
{
        struct snd_emu10k1 *emu = snd_pcm_substream_chip(substream);
        //struct snd_pcm_runtime *runtime = substream->runtime;
        //struct snd_emu10k1_pcm *epcm = runtime->private_data;
        emu->p16v_capture_voice.use = 0;
        /* FIXME: maybe zero others */
        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);
}

/* hw_params callback */
static int snd_p16v_pcm_hw_params_playback(struct snd_pcm_substream *substream,
                                      struct snd_pcm_hw_params *hw_params)
{
        return snd_pcm_lib_malloc_pages(substream,
                                        params_buffer_bytes(hw_params));
}

/* hw_params callback */
static int snd_p16v_pcm_hw_params_capture(struct snd_pcm_substream *substream,
                                      struct snd_pcm_hw_params *hw_params)
{
        return snd_pcm_lib_malloc_pages(substream,
                                        params_buffer_bytes(hw_params));
}


/* hw_free callback */
static int snd_p16v_pcm_hw_free_playback(struct snd_pcm_substream *substream)
{
        return snd_pcm_lib_free_pages(substream);
}

/* hw_free callback */
static int snd_p16v_pcm_hw_free_capture(struct snd_pcm_substream *substream)
{
        return snd_pcm_lib_free_pages(substream);
}


/* 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);
        switch (runtime->rate) {
        case 44100:
          snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel, (tmp & ~0xe0e0) | 0x8080);
          break;
        case 96000:
          snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel, (tmp & ~0xe0e0) | 0x4040);
          break;
        case 192000:
          snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel, (tmp & ~0xe0e0) | 0x2020);
          break;
        case 48000:
        default:
          snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel, (tmp & ~0xe0e0) | 0x0000);
          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, 0x07, channel, 0x0);
        snd_emu10k1_ptr20_write(emu, 0x08, 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;
        u32 tmp;

        /*
        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));
        */
        tmp = snd_emu10k1_ptr_read(emu, A_SPDIF_SAMPLERATE, channel);
        switch (runtime->rate) {
        case 44100:
          snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel, (tmp & ~0x0e00) | 0x0800);
          break;
        case 96000:
          snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel, (tmp & ~0x0e00) | 0x0400);
          break;
        case 192000:
          snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel, (tmp & ~0x0e00) | 0x0200);
          break;
        case 48000:
        default:
          snd_emu10k1_ptr_write(emu, A_SPDIF_SAMPLERATE, channel, (tmp & ~0x0e00) | 0x0000);
          break;
        }
        /* FIXME: Check emu->buffer.size before actually writing to it. */
        snd_emu10k1_ptr20_write(emu, 0x13, 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);
}

/* 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;
        struct snd_emu10k1_pcm *epcm;
        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;
                epcm = runtime->private_data;
                channel = substream->pcm->device-emu->p16v_device_offset;
                /* dev_dbg(emu->card->dev, "p16v channel=%d\n", channel); */
                epcm->running = 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;
        struct snd_emu10k1_pcm *epcm = runtime->private_data;
        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));
                epcm->running = 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));
                epcm->running = 0;
                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;
        struct snd_emu10k1_pcm *epcm = runtime->private_data;
        snd_pcm_uframes_t ptr, ptr1, ptr2,ptr3,ptr4 = 0;
        int channel = substream->pcm->device - emu->p16v_device_offset;
        if (!epcm->running)
                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;
        struct snd_emu10k1_pcm *epcm = runtime->private_data;
        snd_pcm_uframes_t ptr, ptr1, ptr2 = 0;
        int channel = 0;

        if (!epcm->running)
                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_pcm_lib_ioctl,
        .hw_params =   snd_p16v_pcm_hw_params_playback,
        .hw_free =     snd_p16v_pcm_hw_free_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,
        .ioctl =       snd_pcm_lib_ioctl,
        .hw_params =   snd_p16v_pcm_hw_params_capture,
        .hw_free =     snd_p16v_pcm_hw_free_capture,
        .prepare =     snd_p16v_pcm_prepare_capture,
        .trigger =     snd_p16v_pcm_trigger_capture,
        .pointer =     snd_p16v_pcm_pointer_capture,
};


int snd_p16v_free(struct snd_emu10k1 *chip)
{
        // release the data
        if (chip->p16v_buffer.area) {
                snd_dma_free_pages(&chip->p16v_buffer);
                /*
                dev_dbg(chip->card->dev, "period lables free: %p\n",
                           &chip->p16v_buffer);
                */
        }
        return 0;
}

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;

        if ((err = snd_pcm_new(emu->card, "p16v", device, 1, capture, &pcm)) < 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;
        strcpy(pcm->name, "p16v");
        emu->pcm_p16v = pcm;

        for(substream = pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream; 
            substream; 
            substream = substream->next) {
                snd_pcm_lib_preallocate_pages(substream, SNDRV_DMA_TYPE_DEV,
                                              snd_dma_pci_data(emu->pci),
                                              (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_lib_preallocate_pages(substream, SNDRV_DMA_TYPE_DEV,
                                              snd_dma_pci_data(emu->pci),
                                              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 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++) {
                if ((err = snd_ctl_add(card, snd_ctl_new1(&p16v_mixer_controls[i],
                                                          emu))) < 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