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169 lines
4.6 KiB
Diff
169 lines
4.6 KiB
Diff
From bf4dee727fc7c72e250784e8e3e681f9d11bbdc1 Mon Sep 17 00:00:00 2001
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From: Waldemar Brodkorb <wbrodkorb@conet.de>
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Date: Wed, 25 Mar 2015 09:26:17 +0100
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Subject: [PATCH] Add driver for rpi-proto
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Forward port of 3.10.x driver from https://github.com/koalo
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We are using a custom board and would like to use rpi 3.18.x
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kernel. Patch works fine for our embedded system.
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URL to the audio chip:
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http://www.mikroe.com/add-on-boards/audio-voice/audio-codec-proto/
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Playback tested with devicetree enabled.
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Signed-off-by: Waldemar Brodkorb <wbrodkorb@conet.de>
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---
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sound/soc/bcm/rpi-proto.c | 145 ++++++++++++++++++++++++++++++++++++++
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1 file changed, 145 insertions(+)
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create mode 100644 sound/soc/bcm/rpi-proto.c
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--- /dev/null
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+++ b/sound/soc/bcm/rpi-proto.c
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@@ -0,0 +1,145 @@
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+/*
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+ * ASoC driver for PROTO AudioCODEC (with a WM8731)
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+ * connected to a Raspberry Pi
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+ *
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+ * Author: Florian Meier, <koalo@koalo.de>
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+ * Copyright 2013
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+
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+#include <sound/core.h>
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+#include <sound/pcm.h>
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+#include <sound/soc.h>
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+#include <sound/jack.h>
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+
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+#include "../codecs/wm8731.h"
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+
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+static const unsigned int wm8731_rates_12288000[] = {
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+ 8000, 32000, 48000, 96000,
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+};
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+
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+static struct snd_pcm_hw_constraint_list wm8731_constraints_12288000 = {
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+ .list = wm8731_rates_12288000,
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+ .count = ARRAY_SIZE(wm8731_rates_12288000),
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+};
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+
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+static int snd_rpi_proto_startup(struct snd_pcm_substream *substream)
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+{
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+ /* Setup constraints, because there is a 12.288 MHz XTAL on the board */
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+ snd_pcm_hw_constraint_list(substream->runtime, 0,
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+ SNDRV_PCM_HW_PARAM_RATE,
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+ &wm8731_constraints_12288000);
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+ return 0;
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+}
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+
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+static int snd_rpi_proto_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 = substream->private_data;
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+ struct snd_soc_dai *codec_dai = rtd->codec_dai;
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+ struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
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+ int sysclk = 12288000; /* This is fixed on this board */
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+
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+ /* Set proto bclk */
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+ int ret = snd_soc_dai_set_bclk_ratio(cpu_dai,32*2);
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+ if (ret < 0){
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+ dev_err(rtd->card->dev,
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+ "Failed to set BCLK ratio %d\n", ret);
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+ return ret;
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+ }
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+
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+ /* Set proto sysclk */
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+ ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL,
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+ sysclk, SND_SOC_CLOCK_IN);
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+ if (ret < 0) {
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+ dev_err(rtd->card->dev,
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+ "Failed to set WM8731 SYSCLK: %d\n", ret);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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+/* machine stream operations */
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+static struct snd_soc_ops snd_rpi_proto_ops = {
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+ .startup = snd_rpi_proto_startup,
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+ .hw_params = snd_rpi_proto_hw_params,
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+};
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+
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+static struct snd_soc_dai_link snd_rpi_proto_dai[] = {
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+{
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+ .name = "WM8731",
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+ .stream_name = "WM8731 HiFi",
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+ .cpu_dai_name = "bcm2708-i2s.0",
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+ .codec_dai_name = "wm8731-hifi",
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+ .platform_name = "bcm2708-i2s.0",
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+ .codec_name = "wm8731.1-001a",
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+ .dai_fmt = SND_SOC_DAIFMT_I2S
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+ | SND_SOC_DAIFMT_NB_NF
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+ | SND_SOC_DAIFMT_CBM_CFM,
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+ .ops = &snd_rpi_proto_ops,
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+},
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+};
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+
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+/* audio machine driver */
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+static struct snd_soc_card snd_rpi_proto = {
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+ .name = "snd_rpi_proto",
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+ .owner = THIS_MODULE,
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+ .dai_link = snd_rpi_proto_dai,
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+ .num_links = ARRAY_SIZE(snd_rpi_proto_dai),
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+};
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+
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+static int snd_rpi_proto_probe(struct platform_device *pdev)
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+{
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+ int ret = 0;
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+
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+ snd_rpi_proto.dev = &pdev->dev;
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+
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+ if (pdev->dev.of_node) {
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+ struct device_node *i2s_node;
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+ struct snd_soc_dai_link *dai = &snd_rpi_proto_dai[0];
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+ i2s_node = of_parse_phandle(pdev->dev.of_node,
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+ "i2s-controller", 0);
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+
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+ if (i2s_node) {
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+ dai->cpu_dai_name = NULL;
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+ dai->cpu_of_node = i2s_node;
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+ dai->platform_name = NULL;
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+ dai->platform_of_node = i2s_node;
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+ }
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+ }
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+
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+ ret = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_proto);
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+ if (ret && ret != -EPROBE_DEFER)
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+ dev_err(&pdev->dev,
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+ "snd_soc_register_card() failed: %d\n", ret);
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+
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+ return ret;
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+}
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+
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+static const struct of_device_id snd_rpi_proto_of_match[] = {
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+ { .compatible = "rpi,rpi-proto", },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, snd_rpi_proto_of_match);
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+
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+static struct platform_driver snd_rpi_proto_driver = {
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+ .driver = {
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+ .name = "snd-rpi-proto",
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+ .owner = THIS_MODULE,
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+ .of_match_table = snd_rpi_proto_of_match,
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+ },
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+ .probe = snd_rpi_proto_probe,
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+};
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+
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+module_platform_driver(snd_rpi_proto_driver);
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+
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+MODULE_AUTHOR("Florian Meier");
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+MODULE_DESCRIPTION("ASoC Driver for Raspberry Pi connected to PROTO board (WM8731)");
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+MODULE_LICENSE("GPL");
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