1 files changed, 301 insertions, 0 deletions
diff --git a/sound/soc/intel/boards/sof_wm8804.c b/sound/soc/intel/boards/sof_wm8804.c
new file mode 100644
index 000000000000..54395e2ededc
--- /dev/null
+++ b/sound/soc/intel/boards/sof_wm8804.c
@@ -0,0 +1,301 @@
+// 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);
+	ret = snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
+	if (ret < 0) {
+		dev_err(rtd->card->dev, "Failed to set WM8804 PLL\n");
+		return ret;
+	}
+
+	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,
+		.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");