--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * rpi--wm8804.c -- ALSA SoC Raspberry Pi soundcard.
+ *
+ * Copyright (C) 2018 Raspberry Pi.
+ *
+ * Authors: Tim Gover <tim.gover@raspberrypi.org>
+ *
+ * Generic driver for Pi Hat WM8804 digi sounds cards
+ *
+ * Based upon code from:
+ * justboom-digi.c
+ * by Milan Neskovic <info@justboom.co>
+ *
+ * iqaudio_digi.c
+ * by Daniel Matuschek <info@crazy-audio.com>
+ *
+ * allo-digione.c
+ * by Baswaraj <jaikumar@cem-solutions.net>
+ *
+ * hifiberry-digi.c
+ * Daniel Matuschek <info@crazy-audio.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "../codecs/wm8804.h"
+
+struct wm8804_clk_cfg {
+ unsigned int sysclk_freq;
+ unsigned int mclk_freq;
+ unsigned int mclk_div;
+};
+
+/* Parameters for generic functions */
+struct snd_rpi_wm8804_drvdata {
+ /* Required - pointer to the DAI structure */
+ struct snd_soc_dai_link *dai;
+ /* Required - snd_soc_card name */
+ const char *card_name;
+ /* Optional- Overrides the module paramter */
+ unsigned short auto_shutdown_output;
+ /* Optional DT node names if card info is defined in DT */
+ const char *card_name_dt;
+ const char *dai_name_dt;
+ const char *dai_stream_name_dt;
+ /* Optional probe extension - called prior to register_card */
+ int (*probe)(struct platform_device *pdev);
+};
+
+static short int auto_shutdown_output;
+module_param(auto_shutdown_output, short, 0660);
+MODULE_PARM_DESC(auto_shutdown_output, "Shutdown SP/DIF output if playback is stopped");
+
+static struct gpio_desc *snd_clk44gpio;
+static struct gpio_desc *snd_clk48gpio;
+
+#define CLK_44EN_RATE 22579200UL
+#define CLK_48EN_RATE 24576000UL
+
+static int snd_rpi_wm8804_init(struct snd_soc_pcm_runtime *rtd)
+{
+ struct snd_soc_component *component = rtd->codec_dai->component;
+ int rc;
+
+ pr_debug("%s\n", __func__);
+
+ rc = snd_soc_component_update_bits(component, WM8804_PWRDN, 0x4, 0x0);
+ return rc < 0 ? rc : 0;
+}
+
+static int snd_rpi_wm8804_digi_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_component *component = rtd->codec_dai->component;
+ int rc;
+
+ pr_debug("%s\n", __func__);
+
+ rc = snd_soc_component_update_bits(component, WM8804_PWRDN, 0x3c, 0x00);
+ return rc < 0 ? rc : 0;
+}
+
+static void snd_rpi_wm8804_digi_shutdown(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_component *component = rtd->codec_dai->component;
+
+ pr_debug("%s %d\n", __func__, auto_shutdown_output);
+
+ if (auto_shutdown_output)
+ snd_soc_component_update_bits(component, WM8804_PWRDN,
+ 0x3c, 0x3c);
+}
+
+static unsigned int snd_rpi_wm8804_enable_clock(unsigned int samplerate)
+{
+ switch (samplerate) {
+ case 11025:
+ case 22050:
+ case 44100:
+ case 88200:
+ case 176400:
+ gpiod_set_value_cansleep(snd_clk44gpio, 1);
+ gpiod_set_value_cansleep(snd_clk48gpio, 0);
+ return CLK_44EN_RATE;
+ default:
+ gpiod_set_value_cansleep(snd_clk48gpio, 1);
+ gpiod_set_value_cansleep(snd_clk44gpio, 0);
+ return CLK_48EN_RATE;
+ }
+}
+
+static void snd_rpi_wm8804_clk_cfg(unsigned int samplerate,
+ struct wm8804_clk_cfg *clk_cfg)
+{
+ clk_cfg->mclk_freq = 0;
+ clk_cfg->mclk_div = 1;
+ clk_cfg->sysclk_freq = 27000000;
+
+ if (samplerate <= 96000) {
+ clk_cfg->mclk_freq = samplerate * 256;
+ clk_cfg->mclk_div = WM8804_MCLKDIV_256FS;
+ } else {
+ clk_cfg->mclk_freq = samplerate * 128;
+ clk_cfg->mclk_div = WM8804_MCLKDIV_128FS;
+ }
+
+ if (!(IS_ERR(snd_clk44gpio) || IS_ERR(snd_clk48gpio)))
+ clk_cfg->sysclk_freq = snd_rpi_wm8804_enable_clock(samplerate);
+}
+
+static int snd_rpi_wm8804_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_dai *codec_dai = rtd->codec_dai;
+ struct snd_soc_component *component = rtd->codec_dai->component;
+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+ int sampling_freq = 1;
+ int ret;
+ struct wm8804_clk_cfg clk_cfg;
+ int samplerate = params_rate(params);
+
+ snd_rpi_wm8804_clk_cfg(samplerate, &clk_cfg);
+
+ pr_debug("%s samplerate: %d mclk_freq: %u mclk_div: %u sysclk: %u\n",
+ __func__, samplerate, clk_cfg.mclk_freq,
+ clk_cfg.mclk_div, clk_cfg.sysclk_freq);
+
+ 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,
+ "Failed to set WM8804 SYSCLK, unsupported samplerate %d\n",
+ samplerate);
+ }
+
+ snd_soc_dai_set_clkdiv(codec_dai, WM8804_MCLK_DIV, clk_cfg.mclk_div);
+ snd_soc_dai_set_pll(codec_dai, 0, 0,
+ clk_cfg.sysclk_freq, clk_cfg.mclk_freq);
+
+ ret = snd_soc_dai_set_sysclk(codec_dai, WM8804_TX_CLKSRC_PLL,
+ clk_cfg.sysclk_freq, SND_SOC_CLOCK_OUT);
+ if (ret < 0) {
+ dev_err(rtd->card->dev,
+ "Failed to set WM8804 SYSCLK: %d\n", ret);
+ return ret;
+ }
+
+ /* Enable TX output */
+ snd_soc_component_update_bits(component, WM8804_PWRDN, 0x4, 0x0);
+
+ /* Power on */
+ snd_soc_component_update_bits(component, WM8804_PWRDN, 0x9, 0);
+
+ /* set sampling frequency status bits */
+ snd_soc_component_update_bits(component, WM8804_SPDTX4, 0x0f,
+ sampling_freq);
+
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, 64);
+}
+
+static struct snd_soc_ops snd_rpi_wm8804_ops = {
+ .hw_params = snd_rpi_wm8804_hw_params,
+ .startup = snd_rpi_wm8804_digi_startup,
+ .shutdown = snd_rpi_wm8804_digi_shutdown,
+};
+
+static struct snd_soc_dai_link snd_justboom_digi_dai[] = {
+{
+ .name = "JustBoom Digi",
+ .stream_name = "JustBoom Digi HiFi",
+},
+};
+
+static struct snd_rpi_wm8804_drvdata drvdata_justboom_digi = {
+ .card_name = "snd_rpi_justboom_digi",
+ .dai = snd_justboom_digi_dai,
+ .auto_shutdown_output = 1,
+};
+
+static struct snd_soc_dai_link snd_iqaudio_digi_dai[] = {
+{
+ .name = "IQAudIO Digi",
+ .stream_name = "IQAudIO Digi HiFi",
+},
+};
+
+static struct snd_rpi_wm8804_drvdata drvdata_iqaudio_digi = {
+ .card_name = "IQAudIODigi",
+ .dai = snd_iqaudio_digi_dai,
+ .card_name_dt = "wm8804-digi,card-name",
+ .dai_name_dt = "wm8804-digi,dai-name",
+ .dai_stream_name_dt = "wm8804-digi,dai-stream-name",
+};
+
+static int snd_allo_digione_probe(struct platform_device *pdev)
+{
+ pr_debug("%s\n", __func__);
+
+ if (IS_ERR(snd_clk44gpio) || IS_ERR(snd_clk48gpio)) {
+ dev_err(&pdev->dev, "devm_gpiod_get() failed\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static struct snd_soc_dai_link snd_allo_digione_dai[] = {
+{
+ .name = "Allo DigiOne",
+ .stream_name = "Allo DigiOne HiFi",
+},
+};
+
+static struct snd_rpi_wm8804_drvdata drvdata_allo_digione = {
+ .card_name = "snd_allo_digione",
+ .dai = snd_allo_digione_dai,
+ .probe = snd_allo_digione_probe,
+};
+
+static struct snd_soc_dai_link snd_hifiberry_digi_dai[] = {
+{
+ .name = "HifiBerry Digi",
+ .stream_name = "HifiBerry Digi HiFi",
+},
+};
+
+static int snd_hifiberry_digi_probe(struct platform_device *pdev)
+{
+ pr_debug("%s\n", __func__);
+
+ if (IS_ERR(snd_clk44gpio) || IS_ERR(snd_clk48gpio))
+ return 0;
+
+ snd_hifiberry_digi_dai->name = "HiFiBerry Digi+ Pro";
+ snd_hifiberry_digi_dai->stream_name = "HiFiBerry Digi+ Pro HiFi";
+ return 0;
+}
+
+static struct snd_rpi_wm8804_drvdata drvdata_hifiberry_digi = {
+ .card_name = "snd_rpi_hifiberry_digi",
+ .dai = snd_hifiberry_digi_dai,
+ .probe = snd_hifiberry_digi_probe,
+};
+
+static const struct of_device_id snd_rpi_wm8804_of_match[] = {
+ { .compatible = "justboom,justboom-digi",
+ .data = (void *) &drvdata_justboom_digi },
+ { .compatible = "iqaudio,wm8804-digi",
+ .data = (void *) &drvdata_iqaudio_digi },
+ { .compatible = "allo,allo-digione",
+ .data = (void *) &drvdata_allo_digione },
+ { .compatible = "hifiberry,hifiberry-digi",
+ .data = (void *) &drvdata_hifiberry_digi },
+ {},
+};
+
+static struct snd_soc_card snd_rpi_wm8804 = {
+ .driver_name = "RPi-WM8804",
+ .owner = THIS_MODULE,
+ .dai_link = NULL,
+ .num_links = 1,
+};
+
+static int snd_rpi_wm8804_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+ const struct of_device_id *of_id;
+
+ snd_rpi_wm8804.dev = &pdev->dev;
+ of_id = of_match_node(snd_rpi_wm8804_of_match, pdev->dev.of_node);
+
+ if (pdev->dev.of_node && of_id->data) {
+ struct device_node *i2s_node;
+ struct snd_rpi_wm8804_drvdata *drvdata =
+ (struct snd_rpi_wm8804_drvdata *) of_id->data;
+ struct snd_soc_dai_link *dai = drvdata->dai;
+
+ snd_soc_card_set_drvdata(&snd_rpi_wm8804, drvdata);
+
+ if (!dai->init)
+ dai->init = snd_rpi_wm8804_init;
+ if (!dai->ops)
+ dai->ops = &snd_rpi_wm8804_ops;
+ if (!dai->codec_dai_name)
+ dai->codec_dai_name = "wm8804-spdif";
+ if (!dai->codec_name)
+ dai->codec_name = "wm8804.1-003b";
+ if (!dai->dai_fmt)
+ dai->dai_fmt = SND_SOC_DAIFMT_I2S |
+ SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBM_CFM;
+
+ if (drvdata->auto_shutdown_output)
+ auto_shutdown_output = 1;
+
+ snd_rpi_wm8804.dai_link = dai;
+ i2s_node = of_parse_phandle(pdev->dev.of_node,
+ "i2s-controller", 0);
+ if (!i2s_node) {
+ pr_err("Failed to find i2s-controller DT node\n");
+ return -ENODEV;
+ }
+
+ snd_rpi_wm8804.name = drvdata->card_name;
+
+ /* If requested by in drvdata get card & DAI names from DT */
+ if (drvdata->card_name_dt)
+ of_property_read_string(i2s_node,
+ drvdata->card_name_dt,
+ &snd_rpi_wm8804.name);
+
+ if (drvdata->dai_name_dt)
+ of_property_read_string(i2s_node,
+ drvdata->dai_name_dt,
+ &dai->name);
+
+ if (drvdata->dai_stream_name_dt)
+ of_property_read_string(i2s_node,
+ drvdata->dai_stream_name_dt,
+ &dai->stream_name);
+
+ dai->cpu_of_node = i2s_node;
+ dai->platform_of_node = i2s_node;
+
+ /*
+ * clk44gpio and clk48gpio are not required by all cards so
+ * don't check the error status.
+ */
+ snd_clk44gpio =
+ devm_gpiod_get(&pdev->dev, "clock44", GPIOD_OUT_LOW);
+
+ snd_clk48gpio =
+ devm_gpiod_get(&pdev->dev, "clock48", GPIOD_OUT_LOW);
+
+ if (drvdata->probe) {
+ ret = drvdata->probe(pdev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Custom probe failed %d\n",
+ ret);
+ return ret;
+ }
+ }
+
+ pr_debug("%s card: %s dai: %s stream: %s\n", __func__,
+ snd_rpi_wm8804.name,
+ dai->name, dai->stream_name);
+ }
+
+ ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_wm8804);
+ if (ret && ret != -EPROBE_DEFER)
+ dev_err(&pdev->dev, "Failed to register card %d\n", ret);
+
+ return ret;
+}
+
+static struct platform_driver snd_rpi_wm8804_driver = {
+ .driver = {
+ .name = "snd-rpi-wm8804",
+ .owner = THIS_MODULE,
+ .of_match_table = snd_rpi_wm8804_of_match,
+ },
+ .probe = snd_rpi_wm8804_probe,
+};
+MODULE_DEVICE_TABLE(of, snd_rpi_wm8804_of_match);
+
+module_platform_driver(snd_rpi_wm8804_driver);
+
+MODULE_AUTHOR("Tim Gover <tim.gover@raspberrypi.org>");
+MODULE_DESCRIPTION("ASoC Raspberry Pi Hat generic digi driver for WM8804 based cards");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-rpi3.git / commitdiff