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Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0086-ASoC-Create-a-generic-Pi-Hat-WM8804-driver.patch')
-rw-r--r--target/linux/brcm2708/patches-4.19/950-0086-ASoC-Create-a-generic-Pi-Hat-WM8804-driver.patch459
1 files changed, 459 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0086-ASoC-Create-a-generic-Pi-Hat-WM8804-driver.patch b/target/linux/brcm2708/patches-4.19/950-0086-ASoC-Create-a-generic-Pi-Hat-WM8804-driver.patch
new file mode 100644
index 0000000000..1ba0b774b4
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0086-ASoC-Create-a-generic-Pi-Hat-WM8804-driver.patch
@@ -0,0 +1,459 @@
+From 6af5a0adda5b782ad2e134b405ca168895c89b0c Mon Sep 17 00:00:00 2001
+From: Tim Gover <tim.gover@raspberrypi.org>
+Date: Sat, 21 Jul 2018 20:07:46 +0100
+Subject: [PATCH] ASoC: Create a generic Pi Hat WM8804 driver
+
+Reduce the amount of duplicated code by creating a generic driver for
+Pi Hat digi cards using the WM8804 codec.
+
+This replaces the
+Allo DigiOne, Hifiberry Digi/Pro, JustBoom Digi and IQAudIO Digi
+dedicate soundcard drivers with a generic driver.
+
+There are no significant changes to the runtime behavior of the drivers
+and end users should not have to change any configuration settings
+after upgrading.
+
+Minor changes
+* Check the return value of snd_soc_component_update_bits
+* Added some pr_debug tracing
+* Various checkpatch tidyups
+* Updated allodigi-one to use use 128FS at > 96 Khz. This appears to
+ be an omission in the original driver code so followed the Hifiberry
+ DAC driver approach.
+---
+ sound/soc/bcm/rpi-wm8804-soundcard.c | 428 +++++++++++++++++++++++++++
+ 1 file changed, 428 insertions(+)
+ create mode 100644 sound/soc/bcm/rpi-wm8804-soundcard.c
+
+--- /dev/null
++++ b/sound/soc/bcm/rpi-wm8804-soundcard.c
+@@ -0,0 +1,428 @@
++// 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");
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