Orange Pi5 kernel

// 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,
<------><------>.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");