pdaudiocf_pcm.c

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/*
 * Driver for Sound Core PDAudioCF soundcards
 *
 * PCM part
 *
 * Copyright (c) 2003 by Jaroslav Kysela <[email protected]>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/delay.h>
#include <sound/core.h>
#include <sound/asoundef.h>
#include "pdaudiocf.h"


/*
 * clear the SRAM contents
 */
static int pdacf_pcm_clear_sram(struct snd_pdacf *chip)
{
    int max_loop = 64 * 1024;

    while (inw(chip->port + PDAUDIOCF_REG_RDP) != inw(chip->port + PDAUDIOCF_REG_WDP)) {
        if (max_loop-- < 0)
            return -EIO;
        inw(chip->port + PDAUDIOCF_REG_MD);
    }
    return 0;
}

/*
 * pdacf_pcm_trigger - trigger callback for capture
 */
static int pdacf_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
{
    struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
    struct snd_pcm_runtime *runtime = subs->runtime;
    int inc, ret = 0, rate;
    unsigned short mask, val, tmp;

    if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
        return -EBUSY;

    switch (cmd) {
    case SNDRV_PCM_TRIGGER_START:
        chip->pcm_hwptr = 0;
        chip->pcm_tdone = 0;
        /* fall thru */
    case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
    case SNDRV_PCM_TRIGGER_RESUME:
        mask = 0;
        val = PDAUDIOCF_RECORD;
        inc = 1;
        rate = snd_ak4117_check_rate_and_errors(chip->ak4117, AK4117_CHECK_NO_STAT|AK4117_CHECK_NO_RATE);
        break;
    case SNDRV_PCM_TRIGGER_STOP:
    case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
    case SNDRV_PCM_TRIGGER_SUSPEND:
        mask = PDAUDIOCF_RECORD;
        val = 0;
        inc = -1;
        rate = 0;
        break;
    default:
        return -EINVAL;
    }
    spin_lock(&chip->reg_lock);
    chip->pcm_running += inc;
    tmp = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
    if (chip->pcm_running) {
        if ((chip->ak4117->rcs0 & AK4117_UNLCK) || runtime->rate != rate) {
            chip->pcm_running -= inc;
            ret = -EIO;
            goto __end;
        }
    }
    tmp &= ~mask;
    tmp |= val;
    pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, tmp);
      __end:
    spin_unlock(&chip->reg_lock);
    snd_ak4117_check_rate_and_errors(chip->ak4117, AK4117_CHECK_NO_RATE);
    return ret;
}

/*
 * pdacf_pcm_hw_params - hw_params callback for playback and capture
 */
static int pdacf_pcm_hw_params(struct snd_pcm_substream *subs,
                     struct snd_pcm_hw_params *hw_params)
{
    return snd_pcm_lib_alloc_vmalloc_32_buffer
                    (subs, params_buffer_bytes(hw_params));
}

/*
 * pdacf_pcm_hw_free - hw_free callback for playback and capture
 */
static int pdacf_pcm_hw_free(struct snd_pcm_substream *subs)
{
    return snd_pcm_lib_free_vmalloc_buffer(subs);
}

/*
 * pdacf_pcm_prepare - prepare callback for playback and capture
 */
static int pdacf_pcm_prepare(struct snd_pcm_substream *subs)
{
    struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
    struct snd_pcm_runtime *runtime = subs->runtime;
    u16 val, nval, aval;

    if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
        return -EBUSY;

    chip->pcm_channels = runtime->channels;

    chip->pcm_little = snd_pcm_format_little_endian(runtime->format) > 0;
#ifdef SNDRV_LITTLE_ENDIAN
    chip->pcm_swab = snd_pcm_format_big_endian(runtime->format) > 0;
#else
    chip->pcm_swab = chip->pcm_little;
#endif

    if (snd_pcm_format_unsigned(runtime->format))
        chip->pcm_xor = 0x80008000;

    if (pdacf_pcm_clear_sram(chip) < 0)
        return -EIO;
    
    val = nval = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
    nval &= ~(PDAUDIOCF_DATAFMT0|PDAUDIOCF_DATAFMT1);
    switch (runtime->format) {
    case SNDRV_PCM_FORMAT_S16_LE:
    case SNDRV_PCM_FORMAT_S16_BE:
        break;
    default: /* 24-bit */
        nval |= PDAUDIOCF_DATAFMT0 | PDAUDIOCF_DATAFMT1;
        break;
    }
    aval = 0;
    chip->pcm_sample = 4;
    switch (runtime->format) {
    case SNDRV_PCM_FORMAT_S16_LE:
    case SNDRV_PCM_FORMAT_S16_BE:
        aval = AK4117_DIF_16R;
        chip->pcm_frame = 2;
        chip->pcm_sample = 2;
        break;
    case SNDRV_PCM_FORMAT_S24_3LE:
    case SNDRV_PCM_FORMAT_S24_3BE:
        chip->pcm_sample = 3;
        /* fall through */
    default: /* 24-bit */
        aval = AK4117_DIF_24R;
        chip->pcm_frame = 3;
        chip->pcm_xor &= 0xffff0000;
        break;
    }

    if (val != nval) {
        snd_ak4117_reg_write(chip->ak4117, AK4117_REG_IO, AK4117_DIF2|AK4117_DIF1|AK4117_DIF0, aval);
        pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, nval);
    }

    val = pdacf_reg_read(chip,  PDAUDIOCF_REG_IER);
    val &= ~(PDAUDIOCF_IRQLVLEN1);
    val |= PDAUDIOCF_IRQLVLEN0;
    pdacf_reg_write(chip, PDAUDIOCF_REG_IER, val);

    chip->pcm_size = runtime->buffer_size;
    chip->pcm_period = runtime->period_size;
    chip->pcm_area = runtime->dma_area;

    return 0;
}


/*
 * capture hw information
 */

static struct snd_pcm_hardware pdacf_pcm_capture_hw = {
    .info =         (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
                 SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME |
                 SNDRV_PCM_INFO_MMAP_VALID |
                 SNDRV_PCM_INFO_BATCH),
    .formats =      SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
                SNDRV_PCM_FMTBIT_S24_3LE | SNDRV_PCM_FMTBIT_S24_3BE |
                SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE,
    .rates =        SNDRV_PCM_RATE_32000 |
                SNDRV_PCM_RATE_44100 |
                SNDRV_PCM_RATE_48000 |
                SNDRV_PCM_RATE_88200 |
                SNDRV_PCM_RATE_96000 |
                SNDRV_PCM_RATE_176400 |
                SNDRV_PCM_RATE_192000,
    .rate_min =     32000,
    .rate_max =     192000,
    .channels_min =     1,
    .channels_max =     2,
    .buffer_bytes_max = (512*1024),
    .period_bytes_min = 8*1024,
    .period_bytes_max = (64*1024),
    .periods_min =      2,
    .periods_max =      128,
    .fifo_size =        0,
};


/*
 * pdacf_pcm_capture_open - open callback for capture
 */
static int pdacf_pcm_capture_open(struct snd_pcm_substream *subs)
{
    struct snd_pcm_runtime *runtime = subs->runtime;
    struct snd_pdacf *chip = snd_pcm_substream_chip(subs);

    if (chip->chip_status & PDAUDIOCF_STAT_IS_STALE)
        return -EBUSY;

    runtime->hw = pdacf_pcm_capture_hw;
    runtime->private_data = chip;
    chip->pcm_substream = subs;

    return 0;
}

/*
 * pdacf_pcm_capture_close - close callback for capture
 */
static int pdacf_pcm_capture_close(struct snd_pcm_substream *subs)
{
    struct snd_pdacf *chip = snd_pcm_substream_chip(subs);

    if (!chip)
        return -EINVAL;
    pdacf_reinit(chip, 0);
    chip->pcm_substream = NULL;
    return 0;
}


/*
 * pdacf_pcm_capture_pointer - pointer callback for capture
 */
static snd_pcm_uframes_t pdacf_pcm_capture_pointer(struct snd_pcm_substream *subs)
{
    struct snd_pdacf *chip = snd_pcm_substream_chip(subs);
    return chip->pcm_hwptr;
}

/*
 * operators for PCM capture
 */
static struct snd_pcm_ops pdacf_pcm_capture_ops = {
    .open =     pdacf_pcm_capture_open,
    .close =    pdacf_pcm_capture_close,
    .ioctl =    snd_pcm_lib_ioctl,
    .hw_params =    pdacf_pcm_hw_params,
    .hw_free =  pdacf_pcm_hw_free,
    .prepare =  pdacf_pcm_prepare,
    .trigger =  pdacf_pcm_trigger,
    .pointer =  pdacf_pcm_capture_pointer,
    .page =     snd_pcm_lib_get_vmalloc_page,
    .mmap =     snd_pcm_lib_mmap_vmalloc,
};


/*
 * snd_pdacf_pcm_new - create and initialize a pcm
 */
int snd_pdacf_pcm_new(struct snd_pdacf *chip)
{
    struct snd_pcm *pcm;
    int err;

    err = snd_pcm_new(chip->card, "PDAudioCF", 0, 0, 1, &pcm);
    if (err < 0)
        return err;
        
    snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &pdacf_pcm_capture_ops);

    pcm->private_data = chip;
    pcm->info_flags = 0;
    strcpy(pcm->name, chip->card->shortname);
    chip->pcm = pcm;
    
    err = snd_ak4117_build(chip->ak4117, pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream);
    if (err < 0)
        return err;

    return 0;
}