wm1250-ev1.c

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/*
 * Driver for the 1250-EV1 audio I/O module
 *
 * Copyright 2011 Wolfson Microelectronics plc
 *
 *  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.
 *
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/gpio.h>

#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/wm1250-ev1.h>

static const char *wm1250_gpio_names[WM1250_EV1_NUM_GPIOS] = {
    "WM1250 CLK_ENA",
    "WM1250 CLK_SEL0",
    "WM1250 CLK_SEL1",
    "WM1250 OSR",
    "WM1250 MASTER",
};

struct wm1250_priv {
    struct gpio gpios[WM1250_EV1_NUM_GPIOS];
};

static int wm1250_ev1_set_bias_level(struct snd_soc_codec *codec,
                     enum snd_soc_bias_level level)
{
    struct wm1250_priv *wm1250 = dev_get_drvdata(codec->dev);
    int ena;

    if (wm1250)
        ena = wm1250->gpios[WM1250_EV1_GPIO_CLK_ENA].gpio;
    else
        ena = -1;

    switch (level) {
    case SND_SOC_BIAS_ON:
        break;

    case SND_SOC_BIAS_PREPARE:
        break;

    case SND_SOC_BIAS_STANDBY:
        if (ena >= 0)
            gpio_set_value_cansleep(ena, 1);
        break;

    case SND_SOC_BIAS_OFF:
        if (ena >= 0)
            gpio_set_value_cansleep(ena, 0);
        break;
    }

    codec->dapm.bias_level = level;

    return 0;
}

static const struct snd_soc_dapm_widget wm1250_ev1_dapm_widgets[] = {
SND_SOC_DAPM_ADC("ADC", "wm1250-ev1 Capture", SND_SOC_NOPM, 0, 0),
SND_SOC_DAPM_DAC("DAC", "wm1250-ev1 Playback", SND_SOC_NOPM, 0, 0),

SND_SOC_DAPM_INPUT("WM1250 Input"),
SND_SOC_DAPM_OUTPUT("WM1250 Output"),
};

static const struct snd_soc_dapm_route wm1250_ev1_dapm_routes[] = {
    { "ADC", NULL, "WM1250 Input" },
    { "WM1250 Output", NULL, "DAC" },
};

static int wm1250_ev1_hw_params(struct snd_pcm_substream *substream,
                struct snd_pcm_hw_params *params,
                struct snd_soc_dai *dai)
{
    struct wm1250_priv *wm1250 = snd_soc_codec_get_drvdata(dai->codec);

    switch (params_rate(params)) {
    case 8000:
        gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
                   1);
        gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
                   1);
        break;
    case 16000:
        gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
                   0);
        gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
                   1);
        break;
    case 32000:
        gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
                   1);
        gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
                   0);
        break;
    case 64000:
        gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].gpio,
                   0);
        gpio_set_value(wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].gpio,
                   0);
        break;
    default:
        return -EINVAL;
    }

    return 0;
}

static const struct snd_soc_dai_ops wm1250_ev1_ops = {
    .hw_params = wm1250_ev1_hw_params,
};

#define WM1250_EV1_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 |\
              SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_64000)

static struct snd_soc_dai_driver wm1250_ev1_dai = {
    .name = "wm1250-ev1",
    .playback = {
        .stream_name = "Playback",
        .channels_min = 1,
        .channels_max = 2,
        .rates = WM1250_EV1_RATES,
        .formats = SNDRV_PCM_FMTBIT_S16_LE,
    },
    .capture = {
        .stream_name = "Capture",
        .channels_min = 1,
        .channels_max = 2,
        .rates = WM1250_EV1_RATES,
        .formats = SNDRV_PCM_FMTBIT_S16_LE,
    },
    .ops = &wm1250_ev1_ops,
};

static struct snd_soc_codec_driver soc_codec_dev_wm1250_ev1 = {
    .dapm_widgets = wm1250_ev1_dapm_widgets,
    .num_dapm_widgets = ARRAY_SIZE(wm1250_ev1_dapm_widgets),
    .dapm_routes = wm1250_ev1_dapm_routes,
    .num_dapm_routes = ARRAY_SIZE(wm1250_ev1_dapm_routes),

    .set_bias_level = wm1250_ev1_set_bias_level,
    .idle_bias_off = true,
};

static int __devinit wm1250_ev1_pdata(struct i2c_client *i2c)
{
    struct wm1250_ev1_pdata *pdata = dev_get_platdata(&i2c->dev);
    struct wm1250_priv *wm1250;
    int i, ret;

    if (!pdata)
        return 0;

    wm1250 = devm_kzalloc(&i2c->dev, sizeof(*wm1250), GFP_KERNEL);
    if (!wm1250) {
        dev_err(&i2c->dev, "Unable to allocate private data\n");
        ret = -ENOMEM;
        goto err;
    }

    for (i = 0; i < ARRAY_SIZE(wm1250->gpios); i++) {
        wm1250->gpios[i].gpio = pdata->gpios[i];
        wm1250->gpios[i].label = wm1250_gpio_names[i];
        wm1250->gpios[i].flags = GPIOF_OUT_INIT_LOW;
    }
    wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL0].flags = GPIOF_OUT_INIT_HIGH;
    wm1250->gpios[WM1250_EV1_GPIO_CLK_SEL1].flags = GPIOF_OUT_INIT_HIGH;

    ret = gpio_request_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
    if (ret != 0) {
        dev_err(&i2c->dev, "Failed to get GPIOs: %d\n", ret);
        goto err;
    }

    dev_set_drvdata(&i2c->dev, wm1250);

    return ret;

err:
    return ret;
}

static void wm1250_ev1_free(struct i2c_client *i2c)
{
    struct wm1250_priv *wm1250 = dev_get_drvdata(&i2c->dev);

    if (wm1250)
        gpio_free_array(wm1250->gpios, ARRAY_SIZE(wm1250->gpios));
}

static int __devinit wm1250_ev1_probe(struct i2c_client *i2c,
                      const struct i2c_device_id *i2c_id)
{
    int id, board, rev, ret;

    dev_set_drvdata(&i2c->dev, NULL);

    board = i2c_smbus_read_byte_data(i2c, 0);
    if (board < 0) {
        dev_err(&i2c->dev, "Failed to read ID: %d\n", board);
        return board;
    }

    id = (board & 0xfe) >> 2;
    rev = board & 0x3;

    if (id != 1) {
        dev_err(&i2c->dev, "Unknown board ID %d\n", id);
        return -ENODEV;
    }

    dev_info(&i2c->dev, "revision %d\n", rev + 1);

    ret = wm1250_ev1_pdata(i2c);
    if (ret != 0)
        return ret;

    ret = snd_soc_register_codec(&i2c->dev, &soc_codec_dev_wm1250_ev1,
                     &wm1250_ev1_dai, 1);
    if (ret != 0) {
        dev_err(&i2c->dev, "Failed to register CODEC: %d\n", ret);
        wm1250_ev1_free(i2c);
        return ret;
    }

    return 0;
}

static int __devexit wm1250_ev1_remove(struct i2c_client *i2c)
{
    snd_soc_unregister_codec(&i2c->dev);
    wm1250_ev1_free(i2c);

    return 0;
}

static const struct i2c_device_id wm1250_ev1_i2c_id[] = {
    { "wm1250-ev1", 0 },
    { }
};
MODULE_DEVICE_TABLE(i2c, wm1250_ev1_i2c_id);

static struct i2c_driver wm1250_ev1_i2c_driver = {
    .driver = {
        .name = "wm1250-ev1",
        .owner = THIS_MODULE,
    },
    .probe =    wm1250_ev1_probe,
    .remove =   __devexit_p(wm1250_ev1_remove),
    .id_table = wm1250_ev1_i2c_id,
};

module_i2c_driver(wm1250_ev1_i2c_driver);

MODULE_AUTHOR("Mark Brown <[email protected]>");
MODULE_DESCRIPTION("WM1250-EV1 audio I/O module driver");
MODULE_LICENSE("GPL");