Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * 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 <sound/driver.h>

#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),

        .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;

}