--- /dev/null
+From a058f705de89cb54126d9bf8d099acb7ececb6e7 Mon Sep 17 00:00:00 2001
+From: Waldemar Brodkorb <wbrodkorb@conet.de>
+Date: Wed, 25 Mar 2015 09:26:17 +0100
+Subject: [PATCH 075/232] Add driver for rpi-proto
+
+Forward port of 3.10.x driver from https://github.com/koalo
+We are using a custom board and would like to use rpi 3.18.x
+kernel. Patch works fine for our embedded system.
+
+URL to the audio chip:
+http://www.mikroe.com/add-on-boards/audio-voice/audio-codec-proto/
+
+Playback tested with devicetree enabled.
+
+Signed-off-by: Waldemar Brodkorb <wbrodkorb@conet.de>
+---
+ sound/soc/bcm/Kconfig | 7 +++
+ sound/soc/bcm/Makefile | 2 +
+ sound/soc/bcm/rpi-proto.c | 153 ++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 162 insertions(+)
+ create mode 100644 sound/soc/bcm/rpi-proto.c
+
+--- a/sound/soc/bcm/Kconfig
++++ b/sound/soc/bcm/Kconfig
+@@ -43,6 +43,13 @@ config SND_BCM2708_SOC_RPI_DAC
+ help
+ Say Y or M if you want to add support for RPi-DAC.
+
++config SND_BCM2708_SOC_RPI_PROTO
++ tristate "Support for Rpi-PROTO"
++ depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
++ select SND_SOC_WM8731
++ help
++ Say Y or M if you want to add support for Audio Codec Board PROTO (WM8731).
++
+ config SND_BCM2708_SOC_IQAUDIO_DAC
+ tristate "Support for IQaudIO-DAC"
+ depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
+--- a/sound/soc/bcm/Makefile
++++ b/sound/soc/bcm/Makefile
+@@ -9,6 +9,7 @@ snd-soc-hifiberry-dacplus-objs := hifibe
+ snd-soc-hifiberry-digi-objs := hifiberry_digi.o
+ snd-soc-hifiberry-amp-objs := hifiberry_amp.o
+ snd-soc-rpi-dac-objs := rpi-dac.o
++snd-soc-rpi-proto-objs := rpi-proto.o
+ snd-soc-iqaudio-dac-objs := iqaudio-dac.o
+
+ obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
+@@ -16,4 +17,5 @@ obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_D
+ obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
+ obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_AMP) += snd-soc-hifiberry-amp.o
+ obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
++obj-$(CONFIG_SND_BCM2708_SOC_RPI_PROTO) += snd-soc-rpi-proto.o
+ obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
+--- /dev/null
++++ b/sound/soc/bcm/rpi-proto.c
+@@ -0,0 +1,153 @@
++/*
++ * ASoC driver for PROTO AudioCODEC (with a WM8731)
++ * connected to a Raspberry Pi
++ *
++ * Author: Florian Meier, <koalo@koalo.de>
++ * Copyright 2013
++ *
++ * 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.
++ */
++
++#include <linux/module.h>
++#include <linux/platform_device.h>
++
++#include <sound/core.h>
++#include <sound/pcm.h>
++#include <sound/soc.h>
++#include <sound/jack.h>
++
++#include "../codecs/wm8731.h"
++
++static const unsigned int wm8731_rates_12288000[] = {
++ 8000, 32000, 48000, 96000,
++};
++
++static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = {
++ .list = wm8731_rates_12288000,
++ .count = ARRAY_SIZE(wm8731_rates_12288000),
++};
++
++static int snd_rpi_proto_startup(struct snd_pcm_substream *substream)
++{
++ /* Setup constraints, because there is a 12.288 MHz XTAL on the board */
++ snd_pcm_hw_constraint_list(substream->runtime, 0,
++ SNDRV_PCM_HW_PARAM_RATE,
++ &wm8731_constraints_12288000);
++ return 0;
++}
++
++static int snd_rpi_proto_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_codec *codec = rtd->codec;
++ struct snd_soc_dai *codec_dai = rtd->codec_dai;
++ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
++ int sysclk = 12288000; /* This is fixed on this board */
++
++ /* Set proto bclk */
++ int ret = snd_soc_dai_set_bclk_ratio(cpu_dai,32*2);
++ if (ret < 0){
++ dev_err(codec->dev,
++ "Failed to set BCLK ratio %d\n", ret);
++ return ret;
++ }
++
++ /* Set proto sysclk */
++ ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
++ sysclk, SND_SOC_CLOCK_IN);
++ if (ret < 0) {
++ dev_err(codec->dev,
++ "Failed to set WM8731 SYSCLK: %d\n", ret);
++ return ret;
++ }
++
++ return 0;
++}
++
++/* machine stream operations */
++static struct snd_soc_ops snd_rpi_proto_ops = {
++ .startup = snd_rpi_proto_startup,
++ .hw_params = snd_rpi_proto_hw_params,
++};
++
++static struct snd_soc_dai_link snd_rpi_proto_dai[] = {
++{
++ .name = "WM8731",
++ .stream_name = "WM8731 HiFi",
++ .cpu_dai_name = "bcm2708-i2s.0",
++ .codec_dai_name = "wm8731-hifi",
++ .platform_name = "bcm2708-i2s.0",
++ .codec_name = "wm8731.1-001a",
++ .dai_fmt = SND_SOC_DAIFMT_I2S
++ | SND_SOC_DAIFMT_NB_NF
++ | SND_SOC_DAIFMT_CBM_CFM,
++ .ops = &snd_rpi_proto_ops,
++},
++};
++
++/* audio machine driver */
++static struct snd_soc_card snd_rpi_proto = {
++ .name = "snd_rpi_proto",
++ .dai_link = snd_rpi_proto_dai,
++ .num_links = ARRAY_SIZE(snd_rpi_proto_dai),
++};
++
++static int snd_rpi_proto_probe(struct platform_device *pdev)
++{
++ int ret = 0;
++
++ snd_rpi_proto.dev = &pdev->dev;
++
++ if (pdev->dev.of_node) {
++ struct device_node *i2s_node;
++ struct snd_soc_dai_link *dai = &snd_rpi_proto_dai[0];
++ i2s_node = of_parse_phandle(pdev->dev.of_node,
++ "i2s-controller", 0);
++
++ if (i2s_node) {
++ dai->cpu_dai_name = NULL;
++ dai->cpu_of_node = i2s_node;
++ dai->platform_name = NULL;
++ dai->platform_of_node = i2s_node;
++ }
++ }
++
++ ret = snd_soc_register_card(&snd_rpi_proto);
++ if (ret) {
++ dev_err(&pdev->dev,
++ "snd_soc_register_card() failed: %d\n", ret);
++ }
++
++ return ret;
++}
++
++
++static int snd_rpi_proto_remove(struct platform_device *pdev)
++{
++ return snd_soc_unregister_card(&snd_rpi_proto);
++}
++
++static const struct of_device_id snd_rpi_proto_of_match[] = {
++ { .compatible = "rpi,rpi-proto", },
++ {},
++};
++MODULE_DEVICE_TABLE(of, snd_rpi_proto_of_match);
++
++static struct platform_driver snd_rpi_proto_driver = {
++ .driver = {
++ .name = "snd-rpi-proto",
++ .owner = THIS_MODULE,
++ .of_match_table = snd_rpi_proto_of_match,
++ },
++ .probe = snd_rpi_proto_probe,
++ .remove = snd_rpi_proto_remove,
++};
++
++module_platform_driver(snd_rpi_proto_driver);
++
++MODULE_AUTHOR("Florian Meier");
++MODULE_DESCRIPTION("ASoC Driver for Raspberry Pi connected to PROTO board (WM8731)");
++MODULE_LICENSE("GPL");
projects / openwrt / staging / lynxis / omap.git / blobdiff