davinci-sffsdr.c

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/*
 * ASoC driver for Lyrtech SFFSDR board.
 *
 * Author:  Hugo Villeneuve
 * Copyright (C) 2008 Lyrtech inc
 *
 * Based on ASoC driver for TI DAVINCI EVM platform, original copyright follow:
 * Copyright:   (C) 2007 MontaVista Software, Inc., <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>

#include <asm/dma.h>
#include <asm/mach-types.h>
#ifdef CONFIG_SFFSDR_FPGA
#include <asm/plat-sffsdr/sffsdr-fpga.h>
#endif

#include <mach/edma.h>

#include "../codecs/pcm3008.h"
#include "davinci-pcm.h"
#include "davinci-i2s.h"

/*
 * CLKX and CLKR are the inputs for the Sample Rate Generator.
 * FSX and FSR are outputs, driven by the sample Rate Generator.
 */
#define AUDIO_FORMAT (SND_SOC_DAIFMT_DSP_B |    \
              SND_SOC_DAIFMT_CBM_CFS |  \
              SND_SOC_DAIFMT_IB_NF)

static int sffsdr_hw_params(struct snd_pcm_substream *substream,
                struct snd_pcm_hw_params *params)
{
    struct snd_soc_pcm_runtime *rtd = substream->private_data;
    struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
    int fs;
    int ret = 0;

    /* Fsref can be 32000, 44100 or 48000. */
    fs = params_rate(params);

#ifndef CONFIG_SFFSDR_FPGA
    /* Without the FPGA module, the Fs is fixed at 44100 Hz */
    if (fs != 44100) {
        pr_debug("warning: only 44.1 kHz is supported without SFFSDR FPGA module\n");
        return -EINVAL;
    }
#endif

    /* set cpu DAI configuration */
    ret = snd_soc_dai_set_fmt(cpu_dai, AUDIO_FORMAT);
    if (ret < 0)
        return ret;

    pr_debug("sffsdr_hw_params: rate = %d Hz\n", fs);

#ifndef CONFIG_SFFSDR_FPGA
    return 0;
#else
    return sffsdr_fpga_set_codec_fs(fs);
#endif
}

static struct snd_soc_ops sffsdr_ops = {
    .hw_params = sffsdr_hw_params,
};

/* davinci-sffsdr digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link sffsdr_dai = {
    .name = "PCM3008", /* Codec name */
    .stream_name = "PCM3008 HiFi",
    .cpu_dai_name = "davinci-mcbsp",
    .codec_dai_name = "pcm3008-hifi",
    .codec_name = "pcm3008-codec",
    .platform_name = "davinci-mcbsp",
    .ops = &sffsdr_ops,
};

/* davinci-sffsdr audio machine driver */
static struct snd_soc_card snd_soc_sffsdr = {
    .name = "DaVinci SFFSDR",
    .owner = THIS_MODULE,
    .dai_link = &sffsdr_dai,
    .num_links = 1,
};

/* sffsdr audio private data */
static struct pcm3008_setup_data sffsdr_pcm3008_setup = {
    .dem0_pin = GPIO(45),
    .dem1_pin = GPIO(46),
    .pdad_pin = GPIO(47),
    .pdda_pin = GPIO(38),
};

struct platform_device pcm3008_codec = {
        .name = "pcm3008-codec",
        .id = 0,
        .dev = {
                .platform_data = &sffsdr_pcm3008_setup,
        },
};

static struct resource sffsdr_snd_resources[] = {
    {
        .start = DAVINCI_MCBSP_BASE,
        .end = DAVINCI_MCBSP_BASE + SZ_8K - 1,
        .flags = IORESOURCE_MEM,
    },
};

static struct evm_snd_platform_data sffsdr_snd_data = {
    .tx_dma_ch  = DAVINCI_DMA_MCBSP_TX,
    .rx_dma_ch  = DAVINCI_DMA_MCBSP_RX,
};

static struct platform_device *sffsdr_snd_device;

static int __init sffsdr_init(void)
{
    int ret;

    if (!machine_is_sffsdr())
        return -EINVAL;

    platform_device_register(&pcm3008_codec);

    sffsdr_snd_device = platform_device_alloc("soc-audio", 0);
    if (!sffsdr_snd_device) {
        printk(KERN_ERR "platform device allocation failed\n");
        return -ENOMEM;
    }

    platform_set_drvdata(sffsdr_snd_device, &snd_soc_sffsdr);
    platform_device_add_data(sffsdr_snd_device, &sffsdr_snd_data,
                 sizeof(sffsdr_snd_data));

    ret = platform_device_add_resources(sffsdr_snd_device,
                        sffsdr_snd_resources,
                        ARRAY_SIZE(sffsdr_snd_resources));
    if (ret) {
        printk(KERN_ERR "platform device add resources failed\n");
        goto error;
    }

    ret = platform_device_add(sffsdr_snd_device);
    if (ret)
        goto error;

    return ret;

error:
    platform_device_put(sffsdr_snd_device);
    return ret;
}

static void __exit sffsdr_exit(void)
{
    platform_device_unregister(sffsdr_snd_device);
    platform_device_unregister(&pcm3008_codec);
}

module_init(sffsdr_init);
module_exit(sffsdr_exit);

MODULE_AUTHOR("Hugo Villeneuve");
MODULE_DESCRIPTION("Lyrtech SFFSDR ASoC driver");
MODULE_LICENSE("GPL");