302 lines
7.2 KiB
C
302 lines
7.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (c) 2018-2020, Intel Corporation
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//
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// sof-wm8804.c - ASoC machine driver for Up and Up2 board
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// based on WM8804/Hifiberry Digi+
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#include <linux/acpi.h>
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#include <linux/dmi.h>
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#include <linux/gpio/consumer.h>
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#include <linux/gpio/machine.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/soc.h>
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#include <sound/soc-acpi.h>
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#include "../../codecs/wm8804.h"
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struct sof_card_private {
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struct gpio_desc *gpio_44;
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struct gpio_desc *gpio_48;
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int sample_rate;
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};
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#define SOF_WM8804_UP2_QUIRK BIT(0)
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static unsigned long sof_wm8804_quirk;
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static int sof_wm8804_quirk_cb(const struct dmi_system_id *id)
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{
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sof_wm8804_quirk = (unsigned long)id->driver_data;
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return 1;
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}
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static const struct dmi_system_id sof_wm8804_quirk_table[] = {
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{
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.callback = sof_wm8804_quirk_cb,
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "AAEON"),
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DMI_MATCH(DMI_PRODUCT_NAME, "UP-APL01"),
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},
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.driver_data = (void *)SOF_WM8804_UP2_QUIRK,
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},
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{}
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};
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static int sof_wm8804_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
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struct sof_card_private *ctx = snd_soc_card_get_drvdata(rtd->card);
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struct snd_soc_dai *codec_dai = asoc_rtd_to_codec(rtd, 0);
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struct snd_soc_component *codec = codec_dai->component;
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const int sysclk = 27000000; /* This is fixed on this board */
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int samplerate;
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long mclk_freq;
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int mclk_div;
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int sampling_freq;
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bool clk_44;
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int ret;
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samplerate = params_rate(params);
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if (samplerate == ctx->sample_rate)
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return 0;
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ctx->sample_rate = 0;
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if (samplerate <= 96000) {
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mclk_freq = samplerate * 256;
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mclk_div = WM8804_MCLKDIV_256FS;
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} else {
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mclk_freq = samplerate * 128;
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mclk_div = WM8804_MCLKDIV_128FS;
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}
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switch (samplerate) {
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case 32000:
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sampling_freq = 0x03;
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break;
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case 44100:
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sampling_freq = 0x00;
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break;
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case 48000:
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sampling_freq = 0x02;
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break;
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case 88200:
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sampling_freq = 0x08;
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break;
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case 96000:
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sampling_freq = 0x0a;
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break;
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case 176400:
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sampling_freq = 0x0c;
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break;
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case 192000:
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sampling_freq = 0x0e;
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break;
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default:
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dev_err(rtd->card->dev,
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"unsupported samplerate %d\n", samplerate);
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return -EINVAL;
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}
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if (samplerate % 16000)
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clk_44 = true; /* use 44.1 kHz root frequency */
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else
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clk_44 = false;
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if (!(IS_ERR_OR_NULL(ctx->gpio_44) ||
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IS_ERR_OR_NULL(ctx->gpio_48))) {
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/*
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* ensure both GPIOs are LOW first, then drive the
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* relevant one to HIGH
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*/
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if (clk_44) {
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gpiod_set_value_cansleep(ctx->gpio_48, !clk_44);
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gpiod_set_value_cansleep(ctx->gpio_44, clk_44);
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} else {
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gpiod_set_value_cansleep(ctx->gpio_44, clk_44);
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gpiod_set_value_cansleep(ctx->gpio_48, !clk_44);
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}
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}
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snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, mclk_div);
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ret = snd_soc_dai_set_pll(codec_dai, 0, 0, sysclk, mclk_freq);
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if (ret < 0) {
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dev_err(rtd->card->dev, "Failed to set WM8804 PLL\n");
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return ret;
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}
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ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
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sysclk, SND_SOC_CLOCK_OUT);
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if (ret < 0) {
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dev_err(rtd->card->dev,
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"Failed to set WM8804 SYSCLK: %d\n", ret);
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return ret;
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}
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/* set sampling frequency status bits */
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snd_soc_component_update_bits(codec, WM8804_SPDTX4, 0x0f,
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sampling_freq);
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ctx->sample_rate = samplerate;
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return 0;
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}
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/* machine stream operations */
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static struct snd_soc_ops sof_wm8804_ops = {
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.hw_params = sof_wm8804_hw_params,
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};
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SND_SOC_DAILINK_DEF(ssp5_pin,
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DAILINK_COMP_ARRAY(COMP_CPU("SSP5 Pin")));
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SND_SOC_DAILINK_DEF(ssp5_codec,
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DAILINK_COMP_ARRAY(COMP_CODEC("i2c-1AEC8804:00", "wm8804-spdif")));
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SND_SOC_DAILINK_DEF(platform,
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DAILINK_COMP_ARRAY(COMP_PLATFORM("0000:00:0e.0")));
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static struct snd_soc_dai_link dailink[] = {
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/* back ends */
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{
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.name = "SSP5-Codec",
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.id = 0,
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.no_pcm = 1,
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.dpcm_playback = 1,
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.dpcm_capture = 1,
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.ops = &sof_wm8804_ops,
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SND_SOC_DAILINK_REG(ssp5_pin, ssp5_codec, platform),
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},
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};
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/* SoC card */
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static struct snd_soc_card sof_wm8804_card = {
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.name = "wm8804", /* sof- prefix added automatically */
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.owner = THIS_MODULE,
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.dai_link = dailink,
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.num_links = ARRAY_SIZE(dailink),
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};
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/* i2c-<HID>:00 with HID being 8 chars */
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static char codec_name[SND_ACPI_I2C_ID_LEN];
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/*
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* to control the HifiBerry Digi+ PRO, it's required to toggle GPIO to
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* select the clock source. On the Up2 board, this means
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* Pin29/BCM5/Linux GPIO 430 and Pin 31/BCM6/ Linux GPIO 404.
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*
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* Using the ACPI device name is not very nice, but since we only use
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* the value for the Up2 board there is no risk of conflict with other
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* platforms.
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*/
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static struct gpiod_lookup_table up2_gpios_table = {
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/* .dev_id is set during probe */
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.table = {
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GPIO_LOOKUP("INT3452:01", 73, "BCM-GPIO5", GPIO_ACTIVE_HIGH),
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GPIO_LOOKUP("INT3452:01", 74, "BCM-GPIO6", GPIO_ACTIVE_HIGH),
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{ },
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},
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};
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static int sof_wm8804_probe(struct platform_device *pdev)
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{
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struct snd_soc_card *card;
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struct snd_soc_acpi_mach *mach;
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struct sof_card_private *ctx;
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struct acpi_device *adev;
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int dai_index = 0;
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int ret;
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int i;
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ctx = devm_kzalloc(&pdev->dev, sizeof(*ctx), GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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mach = pdev->dev.platform_data;
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card = &sof_wm8804_card;
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card->dev = &pdev->dev;
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dmi_check_system(sof_wm8804_quirk_table);
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if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK) {
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up2_gpios_table.dev_id = dev_name(&pdev->dev);
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gpiod_add_lookup_table(&up2_gpios_table);
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/*
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* The gpios are required for specific boards with
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* local oscillators, and optional in other cases.
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* Since we can't identify when they are needed, use
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* the GPIO as non-optional
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*/
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ctx->gpio_44 = devm_gpiod_get(&pdev->dev, "BCM-GPIO5",
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GPIOD_OUT_LOW);
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if (IS_ERR(ctx->gpio_44)) {
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ret = PTR_ERR(ctx->gpio_44);
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dev_err(&pdev->dev,
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"could not get BCM-GPIO5: %d\n",
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ret);
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return ret;
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}
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ctx->gpio_48 = devm_gpiod_get(&pdev->dev, "BCM-GPIO6",
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GPIOD_OUT_LOW);
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if (IS_ERR(ctx->gpio_48)) {
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ret = PTR_ERR(ctx->gpio_48);
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dev_err(&pdev->dev,
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"could not get BCM-GPIO6: %d\n",
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ret);
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return ret;
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}
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}
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/* fix index of codec dai */
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for (i = 0; i < ARRAY_SIZE(dailink); i++) {
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if (!strcmp(dailink[i].codecs->name, "i2c-1AEC8804:00")) {
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dai_index = i;
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break;
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}
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}
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/* fixup codec name based on HID */
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adev = acpi_dev_get_first_match_dev(mach->id, NULL, -1);
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if (adev) {
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snprintf(codec_name, sizeof(codec_name),
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"%s%s", "i2c-", acpi_dev_name(adev));
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dailink[dai_index].codecs->name = codec_name;
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}
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acpi_dev_put(adev);
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snd_soc_card_set_drvdata(card, ctx);
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return devm_snd_soc_register_card(&pdev->dev, card);
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}
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static int sof_wm8804_remove(struct platform_device *pdev)
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{
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if (sof_wm8804_quirk & SOF_WM8804_UP2_QUIRK)
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gpiod_remove_lookup_table(&up2_gpios_table);
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return 0;
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}
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static struct platform_driver sof_wm8804_driver = {
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.driver = {
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.name = "sof-wm8804",
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.pm = &snd_soc_pm_ops,
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},
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.probe = sof_wm8804_probe,
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.remove = sof_wm8804_remove,
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};
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module_platform_driver(sof_wm8804_driver);
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MODULE_DESCRIPTION("ASoC Intel(R) SOF + WM8804 Machine driver");
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MODULE_AUTHOR("Pierre-Louis Bossart");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:sof-wm8804");
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