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pdaudiocf_pcm.c

/*
 * Driver for Sound Core PDAudioCF soundcards
 *
 * PCM part
 *
 * Copyright (c) 2003 by Jaroslav Kysela <perex@perex.cz>
 *
 *   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/slab.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <sound/core.h>
#include <sound/asoundef.h>
#include "pdaudiocf.h"


/*
 * we use a vmalloc'ed (sg-)buffer
 */

/* get the physical page pointer on the given offset */
static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, unsigned long offset)
{
      void *pageptr = subs->runtime->dma_area + offset;
      return vmalloc_to_page(pageptr);
}

/*
 * hw_params callback
 * NOTE: this may be called not only once per pcm open!
 */
static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t size)
{
      struct snd_pcm_runtime *runtime = subs->runtime;
      if (runtime->dma_area) {
            if (runtime->dma_bytes >= size)
                  return 0; /* already enough large */
            vfree(runtime->dma_area);
      }
      runtime->dma_area = vmalloc_32(size);
      if (! runtime->dma_area)
            return -ENOMEM;
      runtime->dma_bytes = size;
      return 0;
}

/*
 * hw_free callback
 * NOTE: this may be called not only once per pcm open!
 */
static int snd_pcm_free_vmalloc_buffer(struct snd_pcm_substream *subs)
{
      struct snd_pcm_runtime *runtime = subs->runtime;

      vfree(runtime->dma_area);
      runtime->dma_area = NULL;
      return 0;
}

/*
 * 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_alloc_vmalloc_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_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_get_vmalloc_page,
};


/*
 * 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;
}

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