Params: <None>
+Name: dionaudio-loco-v2
+Info: Configures the Dion Audio LOCO-V2 DAC-AMP
+Load: dtoverlay=dionaudio-loco-v2,<param>=<val>
+Params: 24db_digital_gain Allow gain to be applied via the PCM512x codec
+ Digital volume control. Enable with
+ "dtoverlay=hifiberry-dacplus,24db_digital_gain"
+ (The default behaviour is that the Digital
+ volume control is limited to a maximum of
+ 0dB. ie. it can attenuate but not provide
+ gain. For most users, this will be desired
+ as it will prevent clipping. By appending
+ the 24dB_digital_gain parameter, the Digital
+ volume control will allow up to 24dB of
+ gain. If this parameter is enabled, it is the
+ responsibility of the user to ensure that
+ the Digital volume control is set to a value
+ that does not result in clipping/distortion!)
+
+
Name: dpi18
Info: Overlay for a generic 18-bit DPI display
This uses GPIOs 0-21 (so no I2C, uart etc.), and activates the output
--- /dev/null
+/*
+ * ASoC Driver for Dion Audio LOCO-V2 DAC-AMP
+ *
+ * Author: Miquel Blauw <info@dionaudio.nl>
+ * Copyright 2017
+ *
+ * Based on the software of the RPi-DAC writen by Florian Meier
+ *
+ * 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/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+
+static bool digital_gain_0db_limit = true;
+
+static int snd_rpi_dionaudio_loco_v2_init(struct snd_soc_pcm_runtime *rtd)
+{
+ if (digital_gain_0db_limit) {
+ int ret;
+ struct snd_soc_card *card = rtd->card;
+
+ ret = snd_soc_limit_volume(card, "Digital Playback Volume", 207);
+ if (ret < 0)
+ dev_warn(card->dev, "Failed to set volume limit: %d\n", ret);
+ }
+
+ return 0;
+}
+
+static int snd_rpi_dionaudio_loco_v2_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 *cpu_dai = rtd->cpu_dai;
+
+ unsigned int sample_bits =
+ snd_pcm_format_physical_width(params_format(params));
+
+ return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
+}
+
+/* machine stream operations */
+static struct snd_soc_ops snd_rpi_dionaudio_loco_v2_ops = {
+ .hw_params = snd_rpi_dionaudio_loco_v2_hw_params,
+};
+
+static struct snd_soc_dai_link snd_rpi_dionaudio_loco_v2_dai[] = {
+{
+ .name = "DionAudio LOCO-V2",
+ .stream_name = "DionAudio LOCO-V2 DAC-AMP",
+ .cpu_dai_name = "bcm2708-i2s.0",
+ .codec_dai_name = "pcm512x-hifi",
+ .platform_name = "bcm2708-i2s.0",
+ .codec_name = "pcm512x.1-004d",
+ .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+ SND_SOC_DAIFMT_CBS_CFS,
+ .ops = &snd_rpi_dionaudio_loco_v2_ops,
+ .init = snd_rpi_dionaudio_loco_v2_init,
+},};
+
+/* audio machine driver */
+static struct snd_soc_card snd_rpi_dionaudio_loco_v2 = {
+ .name = "Dion Audio LOCO-V2",
+ .dai_link = snd_rpi_dionaudio_loco_v2_dai,
+ .num_links = ARRAY_SIZE(snd_rpi_dionaudio_loco_v2_dai),
+};
+
+static int snd_rpi_dionaudio_loco_v2_probe(struct platform_device *pdev)
+{
+ int ret = 0;
+
+ snd_rpi_dionaudio_loco_v2.dev = &pdev->dev;
+
+ if (pdev->dev.of_node) {
+ struct device_node *i2s_node;
+ struct snd_soc_dai_link *dai =
+ &snd_rpi_dionaudio_loco_v2_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;
+ }
+
+ digital_gain_0db_limit = !of_property_read_bool(
+ pdev->dev.of_node, "dionaudio,24db_digital_gain");
+ }
+
+ ret = snd_soc_register_card(&snd_rpi_dionaudio_loco_v2);
+ if (ret)
+ dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
+ ret);
+
+ return ret;
+}
+
+static int snd_rpi_dionaudio_loco_v2_remove(struct platform_device *pdev)
+{
+ return snd_soc_unregister_card(&snd_rpi_dionaudio_loco_v2);
+}
+
+static const struct of_device_id dionaudio_of_match[] = {
+ { .compatible = "dionaudio,dionaudio-loco-v2", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, dionaudio_of_match);
+
+static struct platform_driver snd_rpi_dionaudio_loco_v2_driver = {
+ .driver = {
+ .name = "snd-rpi-dionaudio-loco-v2",
+ .owner = THIS_MODULE,
+ .of_match_table = dionaudio_of_match,
+ },
+ .probe = snd_rpi_dionaudio_loco_v2_probe,
+ .remove = snd_rpi_dionaudio_loco_v2_remove,
+};
+
+module_platform_driver(snd_rpi_dionaudio_loco_v2_driver);
+
+MODULE_AUTHOR("Miquel Blauw <info@dionaudio.nl>");
+MODULE_DESCRIPTION("ASoC Driver for DionAudio LOCO-V2");
+MODULE_LICENSE("GPL v2");
projects / mirror_ubuntu-zesty-kernel.git / commitdiff