wm8753.c

linux 内核源代码

		.set_fmt = wm8753_mode1v_set_dai_fmt,
		.set_clkdiv = wm8753_set_dai_clkdiv,
		.set_pll = wm8753_set_dai_pll,
		.set_sysclk = wm8753_set_dai_sysclk,
	},
},
/* DAI HiFi mode 2 - dummy */
{	.name = "WM8753 HiFi",
	.id = 2,
},
/* DAI Voice mode 2 */
{	.name = "WM8753 Voice",
	.id = 2,
	.playback = {
		.stream_name = "Voice Playback",
		.channels_min = 1,
		.channels_max = 1,
		.rates = WM8753_RATES,
		.formats = WM8753_FORMATS,},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8753_RATES,
		.formats = WM8753_FORMATS,},
	.ops = {
		.hw_params = wm8753_pcm_hw_params,},
	.dai_ops = {
		.digital_mute = wm8753_mute,
		.set_fmt = wm8753_mode2_set_dai_fmt,
		.set_clkdiv = wm8753_set_dai_clkdiv,
		.set_pll = wm8753_set_dai_pll,
		.set_sysclk = wm8753_set_dai_sysclk,
	},
},
/* DAI HiFi mode 3 */
{	.name = "WM8753 HiFi",
	.id = 3,
	.playback = {
		.stream_name = "HiFi Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8753_RATES,
		.formats = WM8753_FORMATS,},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8753_RATES,
		.formats = WM8753_FORMATS,},
	.ops = {
		.hw_params = wm8753_i2s_hw_params,},
	.dai_ops = {
		.digital_mute = wm8753_mute,
		.set_fmt = wm8753_mode3_4_set_dai_fmt,
		.set_clkdiv = wm8753_set_dai_clkdiv,
		.set_pll = wm8753_set_dai_pll,
		.set_sysclk = wm8753_set_dai_sysclk,
	},
},
/* DAI Voice mode 3 - dummy */
{	.name = "WM8753 Voice",
	.id = 3,
},
/* DAI HiFi mode 4 */
{	.name = "WM8753 HiFi",
	.id = 4,
	.playback = {
		.stream_name = "HiFi Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8753_RATES,
		.formats = WM8753_FORMATS,},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = WM8753_RATES,
		.formats = WM8753_FORMATS,},
	.ops = {
		.hw_params = wm8753_i2s_hw_params,},
	.dai_ops = {
		.digital_mute = wm8753_mute,
		.set_fmt = wm8753_mode3_4_set_dai_fmt,
		.set_clkdiv = wm8753_set_dai_clkdiv,
		.set_pll = wm8753_set_dai_pll,
		.set_sysclk = wm8753_set_dai_sysclk,
	},
},
/* DAI Voice mode 4 - dummy */
{	.name = "WM8753 Voice",
	.id = 4,
},
};

struct snd_soc_codec_dai wm8753_dai[2];
EXPORT_SYMBOL_GPL(wm8753_dai);

static void wm8753_set_dai_mode(struct snd_soc_codec *codec, unsigned int mode)
{
	if (mode < 4) {
		int playback_active, capture_active, codec_active, pop_wait;
		void *private_data;

		playback_active = wm8753_dai[0].playback.active;
		capture_active = wm8753_dai[0].capture.active;
		codec_active = wm8753_dai[0].active;
		private_data = wm8753_dai[0].private_data;
		pop_wait = wm8753_dai[0].pop_wait;
		wm8753_dai[0] = wm8753_all_dai[mode << 1];
		wm8753_dai[0].playback.active = playback_active;
		wm8753_dai[0].capture.active = capture_active;
		wm8753_dai[0].active = codec_active;
		wm8753_dai[0].private_data = private_data;
		wm8753_dai[0].pop_wait = pop_wait;

		playback_active = wm8753_dai[1].playback.active;
		capture_active = wm8753_dai[1].capture.active;
		codec_active = wm8753_dai[1].active;
		private_data = wm8753_dai[1].private_data;
		pop_wait = wm8753_dai[1].pop_wait;
		wm8753_dai[1] = wm8753_all_dai[(mode << 1) + 1];
		wm8753_dai[1].playback.active = playback_active;
		wm8753_dai[1].capture.active = capture_active;
		wm8753_dai[1].active = codec_active;
		wm8753_dai[1].private_data = private_data;
		wm8753_dai[1].pop_wait = pop_wait;
	}
	wm8753_dai[0].codec = codec;
	wm8753_dai[1].codec = codec;
}

static void wm8753_work(struct work_struct *work)
{
	struct snd_soc_codec *codec =
		container_of(work, struct snd_soc_codec, delayed_work.work);
	wm8753_dapm_event(codec, codec->dapm_state);
}

static int wm8753_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;

	/* we only need to suspend if we are a valid card */
	if(!codec->card)
		return 0;
		
	wm8753_dapm_event(codec, SNDRV_CTL_POWER_D3cold);
	return 0;
}

static int wm8753_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;

	/* we only need to resume if we are a valid card */
	if(!codec->card)
		return 0;

	/* Sync reg_cache with the hardware */
	for (i = 0; i < ARRAY_SIZE(wm8753_reg); i++) {
		if (i + 1 == WM8753_RESET)
			continue;
		data[0] = ((i + 1) << 1) | ((cache[i] >> 8) & 0x0001);
		data[1] = cache[i] & 0x00ff;
		codec->hw_write(codec->control_data, data, 2);
	}

	wm8753_dapm_event(codec, SNDRV_CTL_POWER_D3hot);

	/* charge wm8753 caps */
	if (codec->suspend_dapm_state == SNDRV_CTL_POWER_D0) {
		wm8753_dapm_event(codec, SNDRV_CTL_POWER_D2);
		codec->dapm_state = SNDRV_CTL_POWER_D0;
		schedule_delayed_work(&codec->delayed_work,
			msecs_to_jiffies(caps_charge));
	}

	return 0;
}

/*
 * initialise the WM8753 driver
 * register the mixer and dsp interfaces with the kernel
 */
static int wm8753_init(struct snd_soc_device *socdev)
{
	struct snd_soc_codec *codec = socdev->codec;
	int reg, ret = 0;

	codec->name = "WM8753";
	codec->owner = THIS_MODULE;
	codec->read = wm8753_read_reg_cache;
	codec->write = wm8753_write;
	codec->dapm_event = wm8753_dapm_event;
	codec->dai = wm8753_dai;
	codec->num_dai = 2;
	codec->reg_cache_size = sizeof(wm8753_reg);
	codec->reg_cache = kmemdup(wm8753_reg, sizeof(wm8753_reg), GFP_KERNEL);

	if (codec->reg_cache == NULL)
		return -ENOMEM;

	wm8753_set_dai_mode(codec, 0);

	wm8753_reset(codec);

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
		printk(KERN_ERR "wm8753: failed to create pcms\n");
		goto pcm_err;
	}

	/* charge output caps */
	wm8753_dapm_event(codec, SNDRV_CTL_POWER_D2);
	codec->dapm_state = SNDRV_CTL_POWER_D3hot;
	schedule_delayed_work(&codec->delayed_work,
		msecs_to_jiffies(caps_charge));

	/* set the update bits */
	reg = wm8753_read_reg_cache(codec, WM8753_LDAC);
	wm8753_write(codec, WM8753_LDAC, reg | 0x0100);
	reg = wm8753_read_reg_cache(codec, WM8753_RDAC);
	wm8753_write(codec, WM8753_RDAC, reg | 0x0100);
	reg = wm8753_read_reg_cache(codec, WM8753_LADC);
	wm8753_write(codec, WM8753_LADC, reg | 0x0100);
	reg = wm8753_read_reg_cache(codec, WM8753_RADC);
	wm8753_write(codec, WM8753_RADC, reg | 0x0100);
	reg = wm8753_read_reg_cache(codec, WM8753_LOUT1V);
	wm8753_write(codec, WM8753_LOUT1V, reg | 0x0100);
	reg = wm8753_read_reg_cache(codec, WM8753_ROUT1V);
	wm8753_write(codec, WM8753_ROUT1V, reg | 0x0100);
	reg = wm8753_read_reg_cache(codec, WM8753_LOUT2V);
	wm8753_write(codec, WM8753_LOUT2V, reg | 0x0100);
	reg = wm8753_read_reg_cache(codec, WM8753_ROUT2V);
	wm8753_write(codec, WM8753_ROUT2V, reg | 0x0100);
	reg = wm8753_read_reg_cache(codec, WM8753_LINVOL);
	wm8753_write(codec, WM8753_LINVOL, reg | 0x0100);
	reg = wm8753_read_reg_cache(codec, WM8753_RINVOL);
	wm8753_write(codec, WM8753_RINVOL, reg | 0x0100);

	wm8753_add_controls(codec);
	wm8753_add_widgets(codec);
	ret = snd_soc_register_card(socdev);
	if (ret < 0) {
      	printk(KERN_ERR "wm8753: 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 *wm8753_socdev;

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

/*
 * WM8753 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 wm8753_i2c_driver;
static struct i2c_client client_template;

static int wm8753_codec_probe(struct i2c_adapter *adap, int addr, int kind)
{
	struct snd_soc_device *socdev = wm8753_socdev;
	struct wm8753_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 = wm8753_init(socdev);
	if (ret < 0) {
		err("failed to initialise WM8753\n");
		goto err;
	}

	return ret;

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

static int wm8753_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 wm8753_i2c_attach(struct i2c_adapter *adap)
{
	return i2c_probe(adap, &addr_data, wm8753_codec_probe);
}

/* corgi i2c codec control layer */
static struct i2c_driver wm8753_i2c_driver = {
	.driver = {
		.name = "WM8753 I2C Codec",
		.owner = THIS_MODULE,
	},
	.id =             I2C_DRIVERID_WM8753,
	.attach_adapter = wm8753_i2c_attach,
	.detach_client =  wm8753_i2c_detach,
	.command =        NULL,
};

static struct i2c_client client_template = {
	.name =   "WM8753",
	.driver = &wm8753_i2c_driver,
};
#endif

static int wm8753_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct wm8753_setup_data *setup;
	struct snd_soc_codec *codec;
	struct wm8753_priv *wm8753;
	int ret = 0;

	info("WM8753 Audio Codec %s", WM8753_VERSION);

	setup = socdev->codec_data;
	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
	if (codec == NULL)
		return -ENOMEM;

	wm8753 = kzalloc(sizeof(struct wm8753_priv), GFP_KERNEL);
	if (wm8753 == NULL) {
		kfree(codec);
		return -ENOMEM;
	}

	codec->private_data = wm8753;
	socdev->codec = codec;
	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);
	wm8753_socdev = socdev;
	INIT_DELAYED_WORK(&codec->delayed_work, wm8753_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(&wm8753_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 wm8753_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)
		wm8753_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(&wm8753_i2c_driver);
#endif
	kfree(codec->private_data);
	kfree(codec);

	return 0;
}

struct snd_soc_codec_device soc_codec_dev_wm8753 = {
	.probe = 	wm8753_probe,
	.remove = 	wm8753_remove,
	.suspend = 	wm8753_suspend,
	.resume =	wm8753_resume,
};

EXPORT_SYMBOL_GPL(soc_codec_dev_wm8753);

MODULE_DESCRIPTION("ASoC WM8753 driver");
MODULE_AUTHOR("Liam Girdwood");
MODULE_LICENSE("GPL");