--- /dev/null
+// 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 = substream->private_data;
+ 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");
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