+++ /dev/null
-From bf4dee727fc7c72e250784e8e3e681f9d11bbdc1 Mon Sep 17 00:00:00 2001
-From: Waldemar Brodkorb <wbrodkorb@conet.de>
-Date: Wed, 25 Mar 2015 09:26:17 +0100
-Subject: [PATCH] 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/rpi-proto.c | 145 ++++++++++++++++++++++++++++++++++++++
- 1 file changed, 145 insertions(+)
- create mode 100644 sound/soc/bcm/rpi-proto.c
-
---- /dev/null
-+++ b/sound/soc/bcm/rpi-proto.c
-@@ -0,0 +1,145 @@
-+/*
-+ * 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_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(rtd->card->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(rtd->card->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",
-+ .owner = THIS_MODULE,
-+ .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 = devm_snd_soc_register_card(&pdev->dev, &snd_rpi_proto);
-+ if (ret && ret != -EPROBE_DEFER)
-+ dev_err(&pdev->dev,
-+ "snd_soc_register_card() failed: %d\n", ret);
-+
-+ return ret;
-+}
-+
-+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,
-+};
-+
-+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 / openwrt.git / blobdiff