// 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 = snd_soc_substream_to_rtd(substream);
struct sof_card_private *ctx = snd_soc_card_get_drvdata(rtd->card);
struct snd_soc_dai *codec_dai = snd_soc_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 const 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));
dailink[dai_index].codecs->name = codec_name;
} else {
dev_err(&pdev->dev, "Error cannot find '%s' dev\n", mach->id);
return -ENOENT;
}
acpi_dev_put(adev);
snd_soc_card_set_drvdata(card, ctx);
return devm_snd_soc_register_card(&pdev->dev, card);
}
static void sof_wm8804_remove(struct platform_device *pdev)
{
if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK)
gpiod_remove_lookup_table(&up2_gpios_table);
}
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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