wm8750.c

linux 内核源代码

	{12000000, 22050, 544, 0x1b, 0x1},

	/* 32k */
	{12288000, 32000, 384, 0xc, 0x0},
	{18432000, 32000, 576, 0xd, 0x0},
	{12000000, 32000, 375, 0xa, 0x1},

	/* 44.1k */
	{11289600, 44100, 256, 0x10, 0x0},
	{16934400, 44100, 384, 0x11, 0x0},
	{12000000, 44100, 272, 0x11, 0x1},

	/* 48k */
	{12288000, 48000, 256, 0x0, 0x0},
	{18432000, 48000, 384, 0x1, 0x0},
	{12000000, 48000, 250, 0x0, 0x1},

	/* 88.2k */
	{11289600, 88200, 128, 0x1e, 0x0},
	{16934400, 88200, 192, 0x1f, 0x0},
	{12000000, 88200, 136, 0x1f, 0x1},

	/* 96k */
	{12288000, 96000, 128, 0xe, 0x0},
	{18432000, 96000, 192, 0xf, 0x0},
	{12000000, 96000, 125, 0xe, 0x1},
};

static inline int get_coeff(int mclk, int rate)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(coeff_div); i++) {
		if (coeff_div[i].rate == rate && coeff_div[i].mclk == mclk)
			return i;
	}

	printk(KERN_ERR "wm8750: could not get coeff for mclk %d @ rate %d\n",
		mclk, rate);
	return -EINVAL;
}

static int wm8750_set_dai_sysclk(struct snd_soc_codec_dai *codec_dai,
		int clk_id, unsigned int freq, int dir)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct wm8750_priv *wm8750 = codec->private_data;

	switch (freq) {
	case 11289600:
	case 12000000:
	case 12288000:
	case 16934400:
	case 18432000:
		wm8750->sysclk = freq;
		return 0;
	}
	return -EINVAL;
}

static int wm8750_set_dai_fmt(struct snd_soc_codec_dai *codec_dai,
		unsigned int fmt)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	u16 iface = 0;

	/* set master/slave audio interface */
	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
		iface = 0x0040;
		break;
	case SND_SOC_DAIFMT_CBS_CFS:
		break;
	default:
		return -EINVAL;
	}

	/* interface format */
	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
		iface |= 0x0002;
		break;
	case SND_SOC_DAIFMT_RIGHT_J:
		break;
	case SND_SOC_DAIFMT_LEFT_J:
		iface |= 0x0001;
		break;
	case SND_SOC_DAIFMT_DSP_A:
		iface |= 0x0003;
		break;
	case SND_SOC_DAIFMT_DSP_B:
		iface |= 0x0013;
		break;
	default:
		return -EINVAL;
	}

	/* clock inversion */
	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
		break;
	case SND_SOC_DAIFMT_IB_IF:
		iface |= 0x0090;
		break;
	case SND_SOC_DAIFMT_IB_NF:
		iface |= 0x0080;
		break;
	case SND_SOC_DAIFMT_NB_IF:
		iface |= 0x0010;
		break;
	default:
		return -EINVAL;
	}

	wm8750_write(codec, WM8750_IFACE, iface);
	return 0;
}

static int wm8750_pcm_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_device *socdev = rtd->socdev;
	struct snd_soc_codec *codec = socdev->codec;
	struct wm8750_priv *wm8750 = codec->private_data;
	u16 iface = wm8750_read_reg_cache(codec, WM8750_IFACE) & 0x1f3;
	u16 srate = wm8750_read_reg_cache(codec, WM8750_SRATE) & 0x1c0;
	int coeff = get_coeff(wm8750->sysclk, params_rate(params));

	/* bit size */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
		break;
	case SNDRV_PCM_FORMAT_S20_3LE:
		iface |= 0x0004;
		break;
	case SNDRV_PCM_FORMAT_S24_LE:
		iface |= 0x0008;
		break;
	case SNDRV_PCM_FORMAT_S32_LE:
		iface |= 0x000c;
		break;
	}

	/* set iface & srate */
	wm8750_write(codec, WM8750_IFACE, iface);
	if (coeff >= 0)
		wm8750_write(codec, WM8750_SRATE, srate |
			(coeff_div[coeff].sr << 1) | coeff_div[coeff].usb);

	return 0;
}

static int wm8750_mute(struct snd_soc_codec_dai *dai, int mute)
{
	struct snd_soc_codec *codec = dai->codec;
	u16 mute_reg = wm8750_read_reg_cache(codec, WM8750_ADCDAC) & 0xfff7;

	if (mute)
		wm8750_write(codec, WM8750_ADCDAC, mute_reg | 0x8);
	else
		wm8750_write(codec, WM8750_ADCDAC, mute_reg);
	return 0;
}

static int wm8750_dapm_event(struct snd_soc_codec *codec, int event)
{
	u16 pwr_reg = wm8750_read_reg_cache(codec, WM8750_PWR1) & 0xfe3e;

	switch (event) {
	case SNDRV_CTL_POWER_D0: /* full On */
		/* set vmid to 50k and unmute dac */
		wm8750_write(codec, WM8750_PWR1, pwr_reg | 0x00c0);
		break;
	case SNDRV_CTL_POWER_D1: /* partial On */
	case SNDRV_CTL_POWER_D2: /* partial On */
		/* set vmid to 5k for quick power up */
		wm8750_write(codec, WM8750_PWR1, pwr_reg | 0x01c1);
		break;
	case SNDRV_CTL_POWER_D3hot: /* Off, with power */
		/* mute dac and set vmid to 500k, enable VREF */
		wm8750_write(codec, WM8750_PWR1, pwr_reg | 0x0141);
		break;
	case SNDRV_CTL_POWER_D3cold: /* Off, without power */
		wm8750_write(codec, WM8750_PWR1, 0x0001);
		break;
	}
	codec->dapm_state = event;
	return 0;
}

#define WM8750_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\
		SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_44100 | \
		SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)

#define WM8750_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
	SNDRV_PCM_FMTBIT_S24_LE)

struct snd_soc_codec_dai wm8750_dai = {
	.name = "WM8750",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8750_RATES,
		.formats = WM8750_FORMATS,},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8750_RATES,
		.formats = WM8750_FORMATS,},
	.ops = {
		.hw_params = wm8750_pcm_hw_params,
	},
	.dai_ops = {
		.digital_mute = wm8750_mute,
		.set_fmt = wm8750_set_dai_fmt,
		.set_sysclk = wm8750_set_dai_sysclk,
	},
};
EXPORT_SYMBOL_GPL(wm8750_dai);

static void wm8750_work(struct work_struct *work)
{
	struct snd_soc_codec *codec =
		container_of(work, struct snd_soc_codec, delayed_work.work);
	wm8750_dapm_event(codec, codec->dapm_state);
}

static int wm8750_suspend(struct platform_device *pdev, pm_message_t state)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->codec;

	wm8750_dapm_event(codec, SNDRV_CTL_POWER_D3cold);
	return 0;
}

static int wm8750_resume(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->codec;
	int i;
	u8 data[2];
	u16 *cache = codec->reg_cache;

	/* Sync reg_cache with the hardware */
	for (i = 0; i < ARRAY_SIZE(wm8750_reg); i++) {
		if (i == WM8750_RESET)
			continue;
		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
		data[1] = cache[i] & 0x00ff;
		codec->hw_write(codec->control_data, data, 2);
	}

	wm8750_dapm_event(codec, SNDRV_CTL_POWER_D3hot);

	/* charge wm8750 caps */
	if (codec->suspend_dapm_state == SNDRV_CTL_POWER_D0) {
		wm8750_dapm_event(codec, SNDRV_CTL_POWER_D2);
		codec->dapm_state = SNDRV_CTL_POWER_D0;
		schedule_delayed_work(&codec->delayed_work, msecs_to_jiffies(1000));
	}

	return 0;
}

/*
 * initialise the WM8750 driver
 * register the mixer and dsp interfaces with the kernel
 */
static int wm8750_init(struct snd_soc_device *socdev)
{
	struct snd_soc_codec *codec = socdev->codec;
	int reg, ret = 0;

	codec->name = "WM8750";
	codec->owner = THIS_MODULE;
	codec->read = wm8750_read_reg_cache;
	codec->write = wm8750_write;
	codec->dapm_event = wm8750_dapm_event;
	codec->dai = &wm8750_dai;
	codec->num_dai = 1;
	codec->reg_cache_size = sizeof(wm8750_reg);
	codec->reg_cache = kmemdup(wm8750_reg, sizeof(wm8750_reg), GFP_KERNEL);
	if (codec->reg_cache == NULL)
		return -ENOMEM;

	wm8750_reset(codec);

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
		printk(KERN_ERR "wm8750: failed to create pcms\n");
		goto pcm_err;
	}

	/* charge output caps */
	wm8750_dapm_event(codec, SNDRV_CTL_POWER_D2);
	codec->dapm_state = SNDRV_CTL_POWER_D3hot;
	schedule_delayed_work(&codec->delayed_work, msecs_to_jiffies(1000));

	/* set the update bits */
	reg = wm8750_read_reg_cache(codec, WM8750_LDAC);
	wm8750_write(codec, WM8750_LDAC, reg | 0x0100);
	reg = wm8750_read_reg_cache(codec, WM8750_RDAC);
	wm8750_write(codec, WM8750_RDAC, reg | 0x0100);
	reg = wm8750_read_reg_cache(codec, WM8750_LOUT1V);
	wm8750_write(codec, WM8750_LOUT1V, reg | 0x0100);
	reg = wm8750_read_reg_cache(codec, WM8750_ROUT1V);
	wm8750_write(codec, WM8750_ROUT1V, reg | 0x0100);
	reg = wm8750_read_reg_cache(codec, WM8750_LOUT2V);
	wm8750_write(codec, WM8750_LOUT2V, reg | 0x0100);
	reg = wm8750_read_reg_cache(codec, WM8750_ROUT2V);
	wm8750_write(codec, WM8750_ROUT2V, reg | 0x0100);
	reg = wm8750_read_reg_cache(codec, WM8750_LINVOL);
	wm8750_write(codec, WM8750_LINVOL, reg | 0x0100);
	reg = wm8750_read_reg_cache(codec, WM8750_RINVOL);
	wm8750_write(codec, WM8750_RINVOL, reg | 0x0100);

	wm8750_add_controls(codec);
	wm8750_add_widgets(codec);
	ret = snd_soc_register_card(socdev);
	if (ret < 0) {
		printk(KERN_ERR "wm8750: failed to register card\n");
		goto card_err;
	}
	return ret;

card_err:
	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);
pcm_err:
	kfree(codec->reg_cache);
	return ret;
}

/* If the i2c layer weren't so broken, we could pass this kind of data
   around */
static struct snd_soc_device *wm8750_socdev;

#if defined (CONFIG_I2C) || defined (CONFIG_I2C_MODULE)

/*
 * WM8731 2 wire address is determined by GPIO5
 * state during powerup.
 *    low  = 0x1a
 *    high = 0x1b
 */
static unsigned short normal_i2c[] = { 0, I2C_CLIENT_END };

/* Magic definition of all other variables and things */
I2C_CLIENT_INSMOD;

static struct i2c_driver wm8750_i2c_driver;
static struct i2c_client client_template;

static int wm8750_codec_probe(struct i2c_adapter *adap, int addr, int kind)
{
	struct snd_soc_device *socdev = wm8750_socdev;
	struct wm8750_setup_data *setup = socdev->codec_data;
	struct snd_soc_codec *codec = socdev->codec;
	struct i2c_client *i2c;
	int ret;

	if (addr != setup->i2c_address)
		return -ENODEV;

	client_template.adapter = adap;
	client_template.addr = addr;

	i2c = kmemdup(&client_template, sizeof(client_template), GFP_KERNEL);
	if (i2c == NULL) {
		kfree(codec);
		return -ENOMEM;
	}
	i2c_set_clientdata(i2c, codec);
	codec->control_data = i2c;

	ret = i2c_attach_client(i2c);
	if (ret < 0) {
		err("failed to attach codec at addr %x\n", addr);
		goto err;
	}

	ret = wm8750_init(socdev);
	if (ret < 0) {
	err("failed to initialise WM8750\n");
		goto err;
	}
	return ret;

err:
	kfree(codec);
	kfree(i2c);
	return ret;
}

static int wm8750_i2c_detach(struct i2c_client *client)
{
	struct snd_soc_codec *codec = i2c_get_clientdata(client);
	i2c_detach_client(client);
	kfree(codec->reg_cache);
	kfree(client);
	return 0;
}

static int wm8750_i2c_attach(struct i2c_adapter *adap)
{
	return i2c_probe(adap, &addr_data, wm8750_codec_probe);
}

/* corgi i2c codec control layer */
static struct i2c_driver wm8750_i2c_driver = {
	.driver = {
		.name = "WM8750 I2C Codec",
		.owner = THIS_MODULE,
	},
	.id =             I2C_DRIVERID_WM8750,
	.attach_adapter = wm8750_i2c_attach,
	.detach_client =  wm8750_i2c_detach,
	.command =        NULL,
};

static struct i2c_client client_template = {
	.name =   "WM8750",
	.driver = &wm8750_i2c_driver,
};
#endif

static int wm8750_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct wm8750_setup_data *setup = socdev->codec_data;
	struct snd_soc_codec *codec;
	struct wm8750_priv *wm8750;
	int ret = 0;

	info("WM8750 Audio Codec %s", WM8750_VERSION);
	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
	if (codec == NULL)
		return -ENOMEM;

	wm8750 = kzalloc(sizeof(struct wm8750_priv), GFP_KERNEL);
	if (wm8750 == NULL) {
		kfree(codec);
		return -ENOMEM;
	}

	codec->private_data = wm8750;
	socdev->codec = codec;
	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);
	wm8750_socdev = socdev;
	INIT_DELAYED_WORK(&codec->delayed_work, wm8750_work);
	
#if defined (CONFIG_I2C) || defined (CONFIG_I2C_MODULE)
	if (setup->i2c_address) {
		normal_i2c[0] = setup->i2c_address;
		codec->hw_write = (hw_write_t)i2c_master_send;
		ret = i2c_add_driver(&wm8750_i2c_driver);
		if (ret != 0)
			printk(KERN_ERR "can't add i2c driver");
	}
#else
		/* Add other interfaces here */
#endif

	return ret;
}

/*
 * This function forces any delayed work to be queued and run.
 */
static int run_delayed_work(struct delayed_work *dwork)
{
	int ret;

	/* cancel any work waiting to be queued. */
	ret = cancel_delayed_work(dwork);

	/* if there was any work waiting then we run it now and
	 * wait for it's completion */
	if (ret) {
		schedule_delayed_work(dwork, 0);
		flush_scheduled_work();
	}
	return ret;
}

/* power down chip */
static int wm8750_remove(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->codec;

	if (codec->control_data)
		wm8750_dapm_event(codec, SNDRV_CTL_POWER_D3cold);
	run_delayed_work(&codec->delayed_work);
	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);
#if defined (CONFIG_I2C) || defined (CONFIG_I2C_MODULE)
	i2c_del_driver(&wm8750_i2c_driver);
#endif
	kfree(codec->private_data);
	kfree(codec);

	return 0;
}

struct snd_soc_codec_device soc_codec_dev_wm8750 = {
	.probe = 	wm8750_probe,
	.remove = 	wm8750_remove,
	.suspend = 	wm8750_suspend,
	.resume =	wm8750_resume,
};

EXPORT_SYMBOL_GPL(soc_codec_dev_wm8750);

MODULE_DESCRIPTION("ASoC WM8750 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");