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cs5535audio_pcm.c

/*
 * Driver for audio on multifunction CS5535 companion device
 * Copyright (C) Jaya Kumar
 *
 * Based on Jaroslav Kysela and Takashi Iwai's examples.
 * This work was sponsored by CIS(M) Sdn Bhd.
 *
 * 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
 *
 * todo: add be fmt support, spdif, pm
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <sound/driver.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <sound/asoundef.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/ac97_codec.h>
#include "cs5535audio.h"

static struct snd_pcm_hardware snd_cs5535audio_playback =
{
      .info =                 (
                        SNDRV_PCM_INFO_MMAP |
                        SNDRV_PCM_INFO_INTERLEAVED |
                        SNDRV_PCM_INFO_BLOCK_TRANSFER |
                        SNDRV_PCM_INFO_MMAP_VALID |
                        SNDRV_PCM_INFO_PAUSE |
                        SNDRV_PCM_INFO_SYNC_START |
                        SNDRV_PCM_INFO_RESUME
                        ),
      .formats =        (
                        SNDRV_PCM_FMTBIT_S16_LE
                        ),
      .rates =          (
                        SNDRV_PCM_RATE_CONTINUOUS |
                        SNDRV_PCM_RATE_8000_48000
                        ),
      .rate_min =       4000,
      .rate_max =       48000,
      .channels_min =         2,
      .channels_max =         2,
      .buffer_bytes_max =     (128*1024),
      .period_bytes_min =     64,
      .period_bytes_max =     (64*1024 - 16),
      .periods_min =          1,
      .periods_max =          CS5535AUDIO_MAX_DESCRIPTORS,
      .fifo_size =            0,
};

static struct snd_pcm_hardware snd_cs5535audio_capture =
{
      .info =                 (
                        SNDRV_PCM_INFO_MMAP |
                        SNDRV_PCM_INFO_INTERLEAVED |
                        SNDRV_PCM_INFO_BLOCK_TRANSFER |
                        SNDRV_PCM_INFO_MMAP_VALID |
                        SNDRV_PCM_INFO_SYNC_START
                        ),
      .formats =        (
                        SNDRV_PCM_FMTBIT_S16_LE
                        ),
      .rates =          (
                        SNDRV_PCM_RATE_CONTINUOUS |
                        SNDRV_PCM_RATE_8000_48000
                        ),
      .rate_min =       4000,
      .rate_max =       48000,
      .channels_min =         2,
      .channels_max =         2,
      .buffer_bytes_max =     (128*1024),
      .period_bytes_min =     64,
      .period_bytes_max =     (64*1024 - 16),
      .periods_min =          1,
      .periods_max =          CS5535AUDIO_MAX_DESCRIPTORS,
      .fifo_size =            0,
};

static int snd_cs5535audio_playback_open(struct snd_pcm_substream *substream)
{
      int err;
      struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;

      runtime->hw = snd_cs5535audio_playback;
      cs5535au->playback_substream = substream;
      runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK]);
      snd_pcm_set_sync(substream);
      if ((err = snd_pcm_hw_constraint_integer(runtime,
                        SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
            return err;

      return 0;
}

static int snd_cs5535audio_playback_close(struct snd_pcm_substream *substream)
{
      return 0;
}

#define CS5535AUDIO_DESC_LIST_SIZE \
      PAGE_ALIGN(CS5535AUDIO_MAX_DESCRIPTORS * sizeof(struct cs5535audio_dma_desc))

static int cs5535audio_build_dma_packets(struct cs5535audio *cs5535au,
                               struct cs5535audio_dma *dma,
                               struct snd_pcm_substream *substream,
                               unsigned int periods,
                               unsigned int period_bytes)
{
      unsigned int i;
      u32 addr, desc_addr, jmpprd_addr;
      struct cs5535audio_dma_desc *lastdesc;

      if (periods > CS5535AUDIO_MAX_DESCRIPTORS)
            return -ENOMEM;

      if (dma->desc_buf.area == NULL) {
            if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV,
                              snd_dma_pci_data(cs5535au->pci),
                              CS5535AUDIO_DESC_LIST_SIZE+1,
                              &dma->desc_buf) < 0)
                  return -ENOMEM;
            dma->period_bytes = dma->periods = 0;
      }

      if (dma->periods == periods && dma->period_bytes == period_bytes)
            return 0;

      /* the u32 cast is okay because in snd*create we successfully told
         pci alloc that we're only 32 bit capable so the uppper will be 0 */
      addr = (u32) substream->runtime->dma_addr;
      desc_addr = (u32) dma->desc_buf.addr;
      for (i = 0; i < periods; i++) {
            struct cs5535audio_dma_desc *desc =
                  &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[i];
            desc->addr = cpu_to_le32(addr);
            desc->size = cpu_to_le32(period_bytes);
            desc->ctlreserved = cpu_to_le32(PRD_EOP);
            desc_addr += sizeof(struct cs5535audio_dma_desc);
            addr += period_bytes;
      }
      /* we reserved one dummy descriptor at the end to do the PRD jump */
      lastdesc = &((struct cs5535audio_dma_desc *) dma->desc_buf.area)[periods];
      lastdesc->addr = cpu_to_le32((u32) dma->desc_buf.addr);
      lastdesc->size = 0;
      lastdesc->ctlreserved = cpu_to_le32(PRD_JMP);
      jmpprd_addr = cpu_to_le32(lastdesc->addr +
                          (sizeof(struct cs5535audio_dma_desc)*periods));

      dma->period_bytes = period_bytes;
      dma->periods = periods;
      spin_lock_irq(&cs5535au->reg_lock);
      dma->ops->disable_dma(cs5535au);
      dma->ops->setup_prd(cs5535au, jmpprd_addr);
      spin_unlock_irq(&cs5535au->reg_lock);
      return 0;
}

static void cs5535audio_playback_enable_dma(struct cs5535audio *cs5535au)
{
      cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_EN);
}

static void cs5535audio_playback_disable_dma(struct cs5535audio *cs5535au)
{
      cs_writeb(cs5535au, ACC_BM0_CMD, 0);
}

static void cs5535audio_playback_pause_dma(struct cs5535audio *cs5535au)
{
      cs_writeb(cs5535au, ACC_BM0_CMD, BM_CTL_PAUSE);
}

static void cs5535audio_playback_setup_prd(struct cs5535audio *cs5535au,
                                 u32 prd_addr)
{
      cs_writel(cs5535au, ACC_BM0_PRD, prd_addr);
}

static u32 cs5535audio_playback_read_prd(struct cs5535audio *cs5535au)
{
      return cs_readl(cs5535au, ACC_BM0_PRD);
}

static u32 cs5535audio_playback_read_dma_pntr(struct cs5535audio *cs5535au)
{
      return cs_readl(cs5535au, ACC_BM0_PNTR);
}

static void cs5535audio_capture_enable_dma(struct cs5535audio *cs5535au)
{
      cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_EN);
}

static void cs5535audio_capture_disable_dma(struct cs5535audio *cs5535au)
{
      cs_writeb(cs5535au, ACC_BM1_CMD, 0);
}

static void cs5535audio_capture_pause_dma(struct cs5535audio *cs5535au)
{
      cs_writeb(cs5535au, ACC_BM1_CMD, BM_CTL_PAUSE);
}

static void cs5535audio_capture_setup_prd(struct cs5535audio *cs5535au,
                                u32 prd_addr)
{
      cs_writel(cs5535au, ACC_BM1_PRD, prd_addr);
}

static u32 cs5535audio_capture_read_prd(struct cs5535audio *cs5535au)
{
      return cs_readl(cs5535au, ACC_BM1_PRD);
}

static u32 cs5535audio_capture_read_dma_pntr(struct cs5535audio *cs5535au)
{
      return cs_readl(cs5535au, ACC_BM1_PNTR);
}

static void cs5535audio_clear_dma_packets(struct cs5535audio *cs5535au,
                                struct cs5535audio_dma *dma,
                                struct snd_pcm_substream *substream)
{
      snd_dma_free_pages(&dma->desc_buf);
      dma->desc_buf.area = NULL;
}

static int snd_cs5535audio_hw_params(struct snd_pcm_substream *substream,
                             struct snd_pcm_hw_params *hw_params)
{
      struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
      struct cs5535audio_dma *dma = substream->runtime->private_data;
      int err;

      err = snd_pcm_lib_malloc_pages(substream,
                              params_buffer_bytes(hw_params));
      if (err < 0)
            return err;
      dma->buf_addr = substream->runtime->dma_addr;
      dma->buf_bytes = params_buffer_bytes(hw_params);

      err = cs5535audio_build_dma_packets(cs5535au, dma, substream,
                                  params_periods(hw_params),
                                  params_period_bytes(hw_params));
      return err;
}

static int snd_cs5535audio_hw_free(struct snd_pcm_substream *substream)
{
      struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
      struct cs5535audio_dma *dma = substream->runtime->private_data;

      cs5535audio_clear_dma_packets(cs5535au, dma, substream);
      return snd_pcm_lib_free_pages(substream);
}

static int snd_cs5535audio_playback_prepare(struct snd_pcm_substream *substream)
{
      struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
      return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_FRONT_DAC_RATE,
                         substream->runtime->rate);
}

static int snd_cs5535audio_trigger(struct snd_pcm_substream *substream, int cmd)
{
      struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
      struct cs5535audio_dma *dma = substream->runtime->private_data;
      int err = 0;

      spin_lock(&cs5535au->reg_lock);
      switch (cmd) {
      case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
            dma->ops->pause_dma(cs5535au);
            break;
      case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
            dma->ops->enable_dma(cs5535au);
            break;
      case SNDRV_PCM_TRIGGER_START:
            dma->ops->enable_dma(cs5535au);
            break;
      case SNDRV_PCM_TRIGGER_RESUME:
            dma->ops->enable_dma(cs5535au);
            dma->suspended = 0;
            break;
      case SNDRV_PCM_TRIGGER_STOP:
            dma->ops->disable_dma(cs5535au);
            break;
      case SNDRV_PCM_TRIGGER_SUSPEND:
            dma->ops->disable_dma(cs5535au);
            dma->suspended = 1;
            break;
      default:
            snd_printk(KERN_ERR "unhandled trigger\n");
            err = -EINVAL;
            break;
      }
      spin_unlock(&cs5535au->reg_lock);
      return err;
}

static snd_pcm_uframes_t snd_cs5535audio_pcm_pointer(struct snd_pcm_substream
                                          *substream)
{
      struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
      u32 curdma;
      struct cs5535audio_dma *dma;

      dma = substream->runtime->private_data;
      curdma = dma->ops->read_dma_pntr(cs5535au);
      if (curdma < dma->buf_addr) {
            snd_printk(KERN_ERR "curdma=%x < %x bufaddr.\n",
                              curdma, dma->buf_addr);
            return 0;
      }
      curdma -= dma->buf_addr;
      if (curdma >= dma->buf_bytes) {
            snd_printk(KERN_ERR "diff=%x >= %x buf_bytes.\n",
                              curdma, dma->buf_bytes);
            return 0;
      }
      return bytes_to_frames(substream->runtime, curdma);
}

static int snd_cs5535audio_capture_open(struct snd_pcm_substream *substream)
{
      int err;
      struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
      struct snd_pcm_runtime *runtime = substream->runtime;

      runtime->hw = snd_cs5535audio_capture;
      cs5535au->capture_substream = substream;
      runtime->private_data = &(cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE]);
      snd_pcm_set_sync(substream);
      if ((err = snd_pcm_hw_constraint_integer(runtime,
                               SNDRV_PCM_HW_PARAM_PERIODS)) < 0)
            return err;
      return 0;
}

static int snd_cs5535audio_capture_close(struct snd_pcm_substream *substream)
{
      return 0;
}

static int snd_cs5535audio_capture_prepare(struct snd_pcm_substream *substream)
{
      struct cs5535audio *cs5535au = snd_pcm_substream_chip(substream);
      return snd_ac97_set_rate(cs5535au->ac97, AC97_PCM_LR_ADC_RATE,
                         substream->runtime->rate);
}

static struct snd_pcm_ops snd_cs5535audio_playback_ops = {
      .open =           snd_cs5535audio_playback_open,
      .close =    snd_cs5535audio_playback_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_cs5535audio_hw_params,
      .hw_free =  snd_cs5535audio_hw_free,
      .prepare =  snd_cs5535audio_playback_prepare,
      .trigger =  snd_cs5535audio_trigger,
      .pointer =  snd_cs5535audio_pcm_pointer,
};

static struct snd_pcm_ops snd_cs5535audio_capture_ops = {
      .open =           snd_cs5535audio_capture_open,
      .close =    snd_cs5535audio_capture_close,
      .ioctl =    snd_pcm_lib_ioctl,
      .hw_params =      snd_cs5535audio_hw_params,
      .hw_free =  snd_cs5535audio_hw_free,
      .prepare =  snd_cs5535audio_capture_prepare,
      .trigger =  snd_cs5535audio_trigger,
      .pointer =  snd_cs5535audio_pcm_pointer,
};

static struct cs5535audio_dma_ops snd_cs5535audio_playback_dma_ops = {
        .type = CS5535AUDIO_DMA_PLAYBACK,
        .enable_dma = cs5535audio_playback_enable_dma,
        .disable_dma = cs5535audio_playback_disable_dma,
        .setup_prd = cs5535audio_playback_setup_prd,
        .read_prd = cs5535audio_playback_read_prd,
        .pause_dma = cs5535audio_playback_pause_dma,
        .read_dma_pntr = cs5535audio_playback_read_dma_pntr,
};

static struct cs5535audio_dma_ops snd_cs5535audio_capture_dma_ops = {
        .type = CS5535AUDIO_DMA_CAPTURE,
        .enable_dma = cs5535audio_capture_enable_dma,
        .disable_dma = cs5535audio_capture_disable_dma,
        .setup_prd = cs5535audio_capture_setup_prd,
        .read_prd = cs5535audio_capture_read_prd,
        .pause_dma = cs5535audio_capture_pause_dma,
        .read_dma_pntr = cs5535audio_capture_read_dma_pntr,
};

int __devinit snd_cs5535audio_pcm(struct cs5535audio *cs5535au)
{
      struct snd_pcm *pcm;
      int err;

      err = snd_pcm_new(cs5535au->card, "CS5535 Audio", 0, 1, 1, &pcm);
      if (err < 0)
            return err;

      cs5535au->dmas[CS5535AUDIO_DMA_PLAYBACK].ops =
                              &snd_cs5535audio_playback_dma_ops;
      cs5535au->dmas[CS5535AUDIO_DMA_CAPTURE].ops =
                              &snd_cs5535audio_capture_dma_ops;
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
                              &snd_cs5535audio_playback_ops);
      snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
                              &snd_cs5535audio_capture_ops);

      pcm->private_data = cs5535au;
      pcm->info_flags = 0;
      strcpy(pcm->name, "CS5535 Audio");

      snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
                              snd_dma_pci_data(cs5535au->pci),
                              64*1024, 128*1024);
      cs5535au->pcm = pcm;

      return 0;
}


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