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158 lines
4.7 KiB
Diff
158 lines
4.7 KiB
Diff
From ba553edfb4d49867fbe42b079e7058208b0d6dbd Mon Sep 17 00:00:00 2001
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From: Clive Messer <clive.m.messer@gmail.com>
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Date: Mon, 19 Sep 2016 14:01:04 +0100
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Subject: [PATCH 075/782] Allo Piano DAC boards: Initial 2 channel (stereo)
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support (#1645)
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Add initial 2 channel (stereo) support for Allo Piano DAC (2.0/2.1) boards,
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using allo-piano-dac-pcm512x-audio overlay and allo-piano-dac ALSA ASoC
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machine driver.
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NB. The initial support is 2 channel (stereo) ONLY!
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(The Piano DAC 2.1 will only support 2 channel (stereo) left/right output,
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pending an update to the upstream pcm512x codec driver, which will have
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to be submitted via upstream. With the initial downstream support,
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provided by this patch, the Piano DAC 2.1 subwoofer outputs will
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not function.)
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Signed-off-by: Baswaraj K <jaikumar@cem-solutions.net>
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Signed-off-by: Clive Messer <clive.messer@digitaldreamtime.co.uk>
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Tested-by: Clive Messer <clive.messer@digitaldreamtime.co.uk>
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ASoC: allo-piano-dac: fix S24_LE format
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Remove set_bclk_ratio call so 24-bit data is transmitted in
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24 bclk cycles.
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Also remove hw_params and ops as they are no longer needed.
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Signed-off-by: Matthias Reichl <hias@horus.com>
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---
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sound/soc/bcm/allo-piano-dac.c | 120 +++++++++++++++++++++++++++++++++
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1 file changed, 120 insertions(+)
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create mode 100644 sound/soc/bcm/allo-piano-dac.c
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--- /dev/null
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+++ b/sound/soc/bcm/allo-piano-dac.c
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@@ -0,0 +1,120 @@
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+/*
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+ * ALSA ASoC Machine Driver for Allo Piano DAC
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+ *
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+ * Author: Baswaraj K <jaikumar@cem-solutions.net>
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+ * Copyright 2016
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+ * based on code by Daniel Matuschek <info@crazy-audio.com>
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+ * based on code by Florian Meier <florian.meier@koalo.de>
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+ *
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+ * This program is free software; you can redistribute it and/or
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+ * modify it under the terms of the GNU General Public License
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+ * version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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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/pcm_params.h>
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+#include <sound/soc.h>
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+
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+static bool digital_gain_0db_limit = true;
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+
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+static int snd_allo_piano_dac_init(struct snd_soc_pcm_runtime *rtd)
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+{
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+ if (digital_gain_0db_limit) {
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+ int ret;
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+ struct snd_soc_card *card = rtd->card;
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+
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+ ret = snd_soc_limit_volume(card, "Digital Playback Volume",
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+ 207);
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+ if (ret < 0)
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+ dev_warn(card->dev, "Failed to set volume limit: %d\n",
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+ 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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+static struct snd_soc_dai_link snd_allo_piano_dac_dai[] = {
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+{
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+ .name = "Piano DAC",
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+ .stream_name = "Piano DAC HiFi",
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+ .cpu_dai_name = "bcm2708-i2s.0",
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+ .codec_dai_name = "pcm512x-hifi",
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+ .platform_name = "bcm2708-i2s.0",
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+ .codec_name = "pcm512x.1-004c",
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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_CBS_CFS,
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+ .init = snd_allo_piano_dac_init,
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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_allo_piano_dac = {
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+ .name = "PianoDAC",
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+ .owner = THIS_MODULE,
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+ .dai_link = snd_allo_piano_dac_dai,
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+ .num_links = ARRAY_SIZE(snd_allo_piano_dac_dai),
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+};
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+
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+static int snd_allo_piano_dac_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_allo_piano_dac.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;
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+
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+ dai = &snd_allo_piano_dac_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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+ digital_gain_0db_limit = !of_property_read_bool(
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+ pdev->dev.of_node, "allo,24db_digital_gain");
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+ }
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+
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+ ret = devm_snd_soc_register_card(&pdev->dev, &snd_allo_piano_dac);
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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_allo_piano_dac_of_match[] = {
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+ { .compatible = "allo,piano-dac", },
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+ { /* sentinel */ },
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+};
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+MODULE_DEVICE_TABLE(of, snd_allo_piano_dac_of_match);
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+
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+static struct platform_driver snd_allo_piano_dac_driver = {
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+ .driver = {
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+ .name = "snd-allo-piano-dac",
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+ .owner = THIS_MODULE,
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+ .of_match_table = snd_allo_piano_dac_of_match,
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+ },
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+ .probe = snd_allo_piano_dac_probe,
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+};
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+
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+module_platform_driver(snd_allo_piano_dac_driver);
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+
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+MODULE_AUTHOR("Baswaraj K <jaikumar@cem-solutions.net>");
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+MODULE_DESCRIPTION("ALSA ASoC Machine Driver for Allo Piano DAC");
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+MODULE_LICENSE("GPL v2");
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