sound/soc/intel/boards/sof_wm8804.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 // Copyright (c) 2018-2020, Intel Corporation
 //
 // sof-wm8804.c - ASoC machine driver for Up and Up2 board
 // based on WM8804/Hifiberry Digi+


 #include <linux/acpi.h>
 #include <linux/dmi.h>
 #include <linux/gpio/consumer.h>
 #include <linux/gpio/machine.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/soc-acpi.h>
 #include "../../codecs/wm8804.h"

 struct sof_card_private {
 	struct gpio_desc *gpio_44;
 	struct gpio_desc *gpio_48;
 	int sample_rate;
 };

 #define SOF_WM8804_UP2_QUIRK			BIT(0)

 static unsigned long sof_wm8804_quirk;

 static int sof_wm8804_quirk_cb(const struct dmi_system_id *id)
 {
 	sof_wm8804_quirk = (unsigned long)id->driver_data;
 	return 1;
 }

 static const struct dmi_system_id sof_wm8804_quirk_table[] = {
 	{
 		.callback = sof_wm8804_quirk_cb,
 		.matches = {
 			DMI_MATCH(DMI_SYS_VENDOR, "AAEON"),
 			DMI_MATCH(DMI_PRODUCT_NAME, "UP-APL01"),
 		},
 		.driver_data = (void *)SOF_WM8804_UP2_QUIRK,
 	},
 	{}
 };

 static int sof_wm8804_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
 	struct sof_card_private *ctx = snd_soc_card_get_drvdata(rtd->card);
 	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
 	struct snd_soc_component *codec = codec_dai->component;
 	const int sysclk = 27000000; /* This is fixed on this board */
 	int samplerate;
 	long mclk_freq;
 	int mclk_div;
 	int sampling_freq;
 	bool clk_44;
 	int ret;

 	samplerate = params_rate(params);
 	if (samplerate == ctx->sample_rate)
 		return 0;

 	ctx->sample_rate = 0;

 	if (samplerate <= 96000) {
 		mclk_freq = samplerate * 256;
 		mclk_div = WM8804_MCLKDIV_256FS;
 	} else {
 		mclk_freq = samplerate * 128;
 		mclk_div = WM8804_MCLKDIV_128FS;
 	}

 	switch (samplerate) {
 	case 32000:
 		sampling_freq = 0x03;
 		break;
 	case 44100:
 		sampling_freq = 0x00;
 		break;
 	case 48000:
 		sampling_freq = 0x02;
 		break;
 	case 88200:
 		sampling_freq = 0x08;
 		break;
 	case 96000:
 		sampling_freq = 0x0a;
 		break;
 	case 176400:
 		sampling_freq = 0x0c;
 		break;
 	case 192000:
 		sampling_freq = 0x0e;
 		break;
 	default:
 		dev_err(rtd->card->dev,
 			"unsupported samplerate %d\n", samplerate);
 		return -EINVAL;
 	}

 	if (samplerate % 16000)
 		clk_44 = true; /* use 44.1 kHz root frequency */
 	else
 		clk_44 = false;

 	if (!(IS_ERR_OR_NULL(ctx->gpio_44) ||
 	      IS_ERR_OR_NULL(ctx->gpio_48))) {
 		/*
 		 * ensure both GPIOs are LOW first, then drive the
 		 * relevant one to HIGH
 		 */
 		if (clk_44) {
 			gpiod_set_value_cansleep(ctx->gpio_48, !clk_44);
 			gpiod_set_value_cansleep(ctx->gpio_44, clk_44);
 		} else {
 			gpiod_set_value_cansleep(ctx->gpio_44, clk_44);
 			gpiod_set_value_cansleep(ctx->gpio_48, !clk_44);
 		}
 	}

 	snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
 	snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);

 	ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
 				     sysclk, SND_SOC_CLOCK_OUT);
 	if (ret < 0) {
 		dev_err(rtd->card->dev,
 			"Failed to set WM8804 SYSCLK: %d\n", ret);
 		return ret;
 	}

 	/* set sampling frequency status bits */
 	snd_soc_component_update_bits(codec, WM8804_SPDTX4, 0x0f,
 				      sampling_freq);

 	ctx->sample_rate = samplerate;

 	return 0;
 }

 /* machine stream operations */
 static struct snd_soc_ops sof_wm8804_ops = {
 	.hw_params = sof_wm8804_hw_params,
 };

 SND_SOC_DAILINK_DEF(ssp5_pin,
 	DAILINK_COMP_ARRAY(COMP_CPU("SSP5 Pin")));

 SND_SOC_DAILINK_DEF(ssp5_codec,
 	DAILINK_COMP_ARRAY(COMP_CODEC("i2c-1AEC8804:00", "wm8804-spdif")));

 SND_SOC_DAILINK_DEF(platform,
 	DAILINK_COMP_ARRAY(COMP_PLATFORM("0000:00:0e.0")));

 static struct snd_soc_dai_link dailink[] = {
 	/* back ends */
 	{
 		.name = "SSP5-Codec",
 		.id = 0,
 		.no_pcm = 1,
 		.nonatomic = true,
 		.dpcm_playback = 1,
 		.dpcm_capture = 1,
 		.ops = &sof_wm8804_ops,
 		SND_SOC_DAILINK_REG(ssp5_pin, ssp5_codec, platform),
 	},
 };

 /* SoC card */
 static struct snd_soc_card sof_wm8804_card = {
 	.name = "wm8804", /* sof- prefix added automatically */
 	.owner = THIS_MODULE,
 	.dai_link = dailink,
 	.num_links = ARRAY_SIZE(dailink),
 };

  /* i2c-<HID>:00 with HID being 8 chars */
 static char codec_name[SND_ACPI_I2C_ID_LEN];

 /*
  * to control the HifiBerry Digi+ PRO, it's required to toggle GPIO to
  * select the clock source. On the Up2 board, this means
  * Pin29/BCM5/Linux GPIO 430 and Pin 31/BCM6/ Linux GPIO 404.
  *
  * Using the ACPI device name is not very nice, but since we only use
  * the value for the Up2 board there is no risk of conflict with other
  * platforms.
  */

 static struct gpiod_lookup_table up2_gpios_table = {
 	/* .dev_id is set during probe */
 	.table = {
 		GPIO_LOOKUP("INT3452:01", 73, "BCM-GPIO5", GPIO_ACTIVE_HIGH),
 		GPIO_LOOKUP("INT3452:01", 74, "BCM-GPIO6", GPIO_ACTIVE_HIGH),
 		{ },
 	},
 };

 static int sof_wm8804_probe(struct platform_device *pdev)
 {
 	struct snd_soc_card *card;
 	struct snd_soc_acpi_mach *mach;
 	struct sof_card_private *ctx;
 	struct acpi_device *adev;
 	int dai_index = 0;
 	int ret;
 	int i;

 	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
 	if (!ctx)
 		return -ENOMEM;

 	mach = pdev->dev.platform_data;
 	card = &sof_wm8804_card;
 	card->dev = &pdev->dev;

 	dmi_check_system(sof_wm8804_quirk_table);

 	if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK) {
 		up2_gpios_table.dev_id = dev_name(&pdev->dev);
 		gpiod_add_lookup_table(&up2_gpios_table);

 		/*
 		 * The gpios are required for specific boards with
 		 * local oscillators, and optional in other cases.
 		 * Since we can't identify when they are needed, use
 		 * the GPIO as non-optional
 		 */

 		ctx->gpio_44 = devm_gpiod_get(&pdev->dev, "BCM-GPIO5",
 					      GPIOD_OUT_LOW);
 		if (IS_ERR(ctx->gpio_44)) {
 			ret = PTR_ERR(ctx->gpio_44);
 			dev_err(&pdev->dev,
 				"could not get BCM-GPIO5: %d\n",
 				ret);
 			return ret;
 		}

 		ctx->gpio_48 = devm_gpiod_get(&pdev->dev, "BCM-GPIO6",
 					      GPIOD_OUT_LOW);
 		if (IS_ERR(ctx->gpio_48)) {
 			ret = PTR_ERR(ctx->gpio_48);
 			dev_err(&pdev->dev,
 				"could not get BCM-GPIO6: %d\n",
 				ret);
 			return ret;
 		}
 	}

 	/* fix index of codec dai */
 	for (i = 0; i < ARRAY_SIZE(dailink); i++) {
 		if (!strcmp(dailink[i].codecs->name, "i2c-1AEC8804:00")) {
 			dai_index = i;
 			break;
 		}
 	}

 	/* fixup codec name based on HID */
 	adev = acpi_dev_get_first_match_dev(mach->id, NULL, -1);
 	if (adev) {
 		snprintf(codec_name, sizeof(codec_name),
 			 "%s%s", "i2c-", acpi_dev_name(adev));
 		put_device(&adev->dev);
 		dailink[dai_index].codecs->name = codec_name;
 	}

 	snd_soc_card_set_drvdata(card, ctx);

 	return devm_snd_soc_register_card(&pdev->dev, card);
 }

 static int sof_wm8804_remove(struct platform_device *pdev)
 {
 	if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK)
 		gpiod_remove_lookup_table(&up2_gpios_table);
 	return 0;
 }

 static struct platform_driver sof_wm8804_driver = {
 	.driver = {
 		.name = "sof-wm8804",
 		.pm = &snd_soc_pm_ops,
 	},
 	.probe = sof_wm8804_probe,
 	.remove = sof_wm8804_remove,
 };
 module_platform_driver(sof_wm8804_driver);

 MODULE_DESCRIPTION("ASoC Intel(R) SOF + WM8804 Machine driver");
 MODULE_AUTHOR("Pierre-Louis Bossart");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:sof-wm8804");
	// SPDX-License-Identifier: GPL-2.0-only
	// Copyright (c) 2018-2020, Intel Corporation
	//
	// sof-wm8804.c - ASoC machine driver for Up and Up2 board
	// based on WM8804/Hifiberry Digi+


	#include <linux/acpi.h>
	#include <linux/dmi.h>
	#include <linux/gpio/consumer.h>
	#include <linux/gpio/machine.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/soc-acpi.h>
	#include "../../codecs/wm8804.h"

	struct sof_card_private {
	struct gpio_desc *gpio_44;
	struct gpio_desc *gpio_48;
	int sample_rate;
	};

	#define SOF_WM8804_UP2_QUIRK BIT(0)

	static unsigned long sof_wm8804_quirk;

	static int sof_wm8804_quirk_cb(const struct dmi_system_id *id)
	{
	sof_wm8804_quirk = (unsigned long)id->driver_data;
	return 1;
	}

	static const struct dmi_system_id sof_wm8804_quirk_table[] = {
	{
	.callback = sof_wm8804_quirk_cb,
	.matches = {
	DMI_MATCH(DMI_SYS_VENDOR, "AAEON"),
	DMI_MATCH(DMI_PRODUCT_NAME, "UP-APL01"),
	},
	.driver_data = (void *)SOF_WM8804_UP2_QUIRK,
	},
	{}
	};

	static int sof_wm8804_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
	struct sof_card_private *ctx = snd_soc_card_get_drvdata(rtd->card);
	struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
	struct snd_soc_component *codec = codec_dai->component;
	const int sysclk = 27000000; /* This is fixed on this board */
	int samplerate;
	long mclk_freq;
	int mclk_div;
	int sampling_freq;
	bool clk_44;
	int ret;

	samplerate = params_rate(params);
	if (samplerate == ctx->sample_rate)
	return 0;

	ctx->sample_rate = 0;

	if (samplerate <= 96000) {
	mclk_freq = samplerate * 256;
	mclk_div = WM8804_MCLKDIV_256FS;
	} else {
	mclk_freq = samplerate * 128;
	mclk_div = WM8804_MCLKDIV_128FS;
	}

	switch (samplerate) {
	case 32000:
	sampling_freq = 0x03;
	break;
	case 44100:
	sampling_freq = 0x00;
	break;
	case 48000:
	sampling_freq = 0x02;
	break;
	case 88200:
	sampling_freq = 0x08;
	break;
	case 96000:
	sampling_freq = 0x0a;
	break;
	case 176400:
	sampling_freq = 0x0c;
	break;
	case 192000:
	sampling_freq = 0x0e;
	break;
	default:
	dev_err(rtd->card->dev,
	"unsupported samplerate %d\n", samplerate);
	return -EINVAL;
	}

	if (samplerate % 16000)
	clk_44 = true; /* use 44.1 kHz root frequency */
	else
	clk_44 = false;

	if (!(IS_ERR_OR_NULL(ctx->gpio_44) \|\|
	IS_ERR_OR_NULL(ctx->gpio_48))) {
	/*
	* ensure both GPIOs are LOW first, then drive the
	* relevant one to HIGH
	*/
	if (clk_44) {
	gpiod_set_value_cansleep(ctx->gpio_48, !clk_44);
	gpiod_set_value_cansleep(ctx->gpio_44, clk_44);
	} else {
	gpiod_set_value_cansleep(ctx->gpio_44, clk_44);
	gpiod_set_value_cansleep(ctx->gpio_48, !clk_44);
	}
	}

	snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
	snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);

	ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
	sysclk, SND_SOC_CLOCK_OUT);
	if (ret < 0) {
	dev_err(rtd->card->dev,
	"Failed to set WM8804 SYSCLK: %d\n", ret);
	return ret;
	}

	/* set sampling frequency status bits */
	snd_soc_component_update_bits(codec, WM8804_SPDTX4, 0x0f,
	sampling_freq);

	ctx->sample_rate = samplerate;

	return 0;
	}

	/* machine stream operations */
	static struct snd_soc_ops sof_wm8804_ops = {
	.hw_params = sof_wm8804_hw_params,
	};

	SND_SOC_DAILINK_DEF(ssp5_pin,
	DAILINK_COMP_ARRAY(COMP_CPU("SSP5 Pin")));

	SND_SOC_DAILINK_DEF(ssp5_codec,
	DAILINK_COMP_ARRAY(COMP_CODEC("i2c-1AEC8804:00", "wm8804-spdif")));

	SND_SOC_DAILINK_DEF(platform,
	DAILINK_COMP_ARRAY(COMP_PLATFORM("0000:00:0e.0")));

	static struct snd_soc_dai_link dailink[] = {
	/* back ends */
	{
	.name = "SSP5-Codec",
	.id = 0,
	.no_pcm = 1,
	.nonatomic = true,
	.dpcm_playback = 1,
	.dpcm_capture = 1,
	.ops = &sof_wm8804_ops,
	SND_SOC_DAILINK_REG(ssp5_pin, ssp5_codec, platform),
	},
	};

	/* SoC card */
	static struct snd_soc_card sof_wm8804_card = {
	.name = "wm8804", /* sof- prefix added automatically */
	.owner = THIS_MODULE,
	.dai_link = dailink,
	.num_links = ARRAY_SIZE(dailink),
	};

	/* i2c-<HID>:00 with HID being 8 chars */
	static char codec_name[SND_ACPI_I2C_ID_LEN];

	/*
	* to control the HifiBerry Digi+ PRO, it's required to toggle GPIO to
	* select the clock source. On the Up2 board, this means
	* Pin29/BCM5/Linux GPIO 430 and Pin 31/BCM6/ Linux GPIO 404.
	*
	* Using the ACPI device name is not very nice, but since we only use
	* the value for the Up2 board there is no risk of conflict with other
	* platforms.
	*/

	static struct gpiod_lookup_table up2_gpios_table = {
	/* .dev_id is set during probe */
	.table = {
	GPIO_LOOKUP("INT3452:01", 73, "BCM-GPIO5", GPIO_ACTIVE_HIGH),
	GPIO_LOOKUP("INT3452:01", 74, "BCM-GPIO6", GPIO_ACTIVE_HIGH),
	{ },
	},
	};

	static int sof_wm8804_probe(struct platform_device *pdev)
	{
	struct snd_soc_card *card;
	struct snd_soc_acpi_mach *mach;
	struct sof_card_private *ctx;
	struct acpi_device *adev;
	int dai_index = 0;
	int ret;
	int i;

	ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
	if (!ctx)
	return -ENOMEM;

	mach = pdev->dev.platform_data;
	card = &sof_wm8804_card;
	card->dev = &pdev->dev;

	dmi_check_system(sof_wm8804_quirk_table);

	if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK) {
	up2_gpios_table.dev_id = dev_name(&pdev->dev);
	gpiod_add_lookup_table(&up2_gpios_table);

	/*
	* The gpios are required for specific boards with
	* local oscillators, and optional in other cases.
	* Since we can't identify when they are needed, use
	* the GPIO as non-optional
	*/

	ctx->gpio_44 = devm_gpiod_get(&pdev->dev, "BCM-GPIO5",
	GPIOD_OUT_LOW);
	if (IS_ERR(ctx->gpio_44)) {
	ret = PTR_ERR(ctx->gpio_44);
	dev_err(&pdev->dev,
	"could not get BCM-GPIO5: %d\n",
	ret);
	return ret;
	}

	ctx->gpio_48 = devm_gpiod_get(&pdev->dev, "BCM-GPIO6",
	GPIOD_OUT_LOW);
	if (IS_ERR(ctx->gpio_48)) {
	ret = PTR_ERR(ctx->gpio_48);
	dev_err(&pdev->dev,
	"could not get BCM-GPIO6: %d\n",
	ret);
	return ret;
	}
	}

	/* fix index of codec dai */
	for (i = 0; i < ARRAY_SIZE(dailink); i++) {
	if (!strcmp(dailink[i].codecs->name, "i2c-1AEC8804:00")) {
	dai_index = i;
	break;
	}
	}

	/* fixup codec name based on HID */
	adev = acpi_dev_get_first_match_dev(mach->id, NULL, -1);
	if (adev) {
	snprintf(codec_name, sizeof(codec_name),
	"%s%s", "i2c-", acpi_dev_name(adev));
	put_device(&adev->dev);
	dailink[dai_index].codecs->name = codec_name;
	}

	snd_soc_card_set_drvdata(card, ctx);

	return devm_snd_soc_register_card(&pdev->dev, card);
	}

	static int sof_wm8804_remove(struct platform_device *pdev)
	{
	if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK)
	gpiod_remove_lookup_table(&up2_gpios_table);
	return 0;
	}

	static struct platform_driver sof_wm8804_driver = {
	.driver = {
	.name = "sof-wm8804",
	.pm = &snd_soc_pm_ops,
	},
	.probe = sof_wm8804_probe,
	.remove = sof_wm8804_remove,
	};
	module_platform_driver(sof_wm8804_driver);

	MODULE_DESCRIPTION("ASoC Intel(R) SOF + WM8804 Machine driver");
	MODULE_AUTHOR("Pierre-Louis Bossart");
	MODULE_LICENSE("GPL v2");
	MODULE_ALIAS("platform:sof-wm8804");