+++ /dev/null
-From 76c252645ad542bd35ce52230635f36e3c0f730d Mon Sep 17 00:00:00 2001
-From: Gordon Garrity <gordon@iqaudio.com>
-Date: Sat, 8 Mar 2014 16:56:57 +0000
-Subject: [PATCH] Add IQaudIO Sound Card support for Raspberry Pi
-
-Set a limit of 0dB on Digital Volume Control
-
-The main volume control in the PCM512x DAC has a range up to
-+24dB. This is dangerously loud and can potentially cause massive
-clipping in the output stages. Therefore this sets a sensible
-limit of 0dB for this control.
-
-Allow up to 24dB digital gain to be applied when using IQAudIO DAC+
-
-24db_digital_gain DT param can be used to specify that PCM512x
-codec "Digital" volume control should not be limited to 0dB gain,
-and if specified will allow the full 24dB gain.
-
-Modify IQAudIO DAC+ ASoC driver to set card/dai config from dt
-
-Add the ability to set the card name, dai name and dai stream name, from
-dt config.
-
-Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
-
-IQaudIO: auto-mute for AMP+ and DigiAMP+
-
-IQAudIO amplifier mute via GPIO22. Add dt params for "one-shot" unmute
-and auto mute.
-
-Revision 2, auto mute implementing HiassofT suggestion to mute/unmute
-using set_bias_level, rather than startup/shutdown....
-"By default DAPM waits 5 seconds (pmdown_time) before shutting down
-playback streams so a close/stop immediately followed by open/start
-doesn't trigger an amp mute+unmute."
-
-Tested on both AMP+ (via DAC+) and DigiAMP+, with both options...
-
-dtoverlay=iqaudio-dacplus,unmute_amp
- "one-shot" unmute when kernel module loads.
-
-dtoverlay=iqaudio-dacplus,auto_mute_amp
- Unmute amp when ALSA device opened by a client. Mute, with 5 second delay
- when ALSA device closed. (Re-opening the device within the 5 second close
- window, will cancel mute.)
-
-Revision 4, using gpiod.
-
-Revision 5, clean-up formatting before adding mute code.
- - Convert tab plus 4 space formatting to 2x tab
- - Remove '// NOT USED' commented code
-
-Revision 6, don't attempt to "one-shot" unmute amp, unless card is
-successfully registered.
-
-Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
-
-ASoC: iqaudio-dac: fix S24_LE format
-
-Remove set_bclk_ratio call so 24-bit data is transmitted in
-24 bclk cycles.
-
-Signed-off-by: Matthias Reichl <hias@horus.com>
----
- sound/soc/bcm/iqaudio-dac.c | 221 ++++++++++++++++++++++++++++++++++++
- 1 file changed, 221 insertions(+)
- create mode 100644 sound/soc/bcm/iqaudio-dac.c
-
---- /dev/null
-+++ b/sound/soc/bcm/iqaudio-dac.c
-@@ -0,0 +1,221 @@
-+/*
-+ * ASoC Driver for IQaudIO DAC
-+ *
-+ * Author: Florian Meier <florian.meier@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.
-+ *
-+ * 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/gpio/consumer.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 struct gpio_desc *mute_gpio;
-+
-+static int snd_rpi_iqaudio_dac_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 void snd_rpi_iqaudio_gpio_mute(struct snd_soc_card *card)
-+{
-+ if (mute_gpio) {
-+ dev_info(card->dev, "%s: muting amp using GPIO22\n",
-+ __func__);
-+ gpiod_set_value_cansleep(mute_gpio, 0);
-+ }
-+}
-+
-+static void snd_rpi_iqaudio_gpio_unmute(struct snd_soc_card *card)
-+{
-+ if (mute_gpio) {
-+ dev_info(card->dev, "%s: un-muting amp using GPIO22\n",
-+ __func__);
-+ gpiod_set_value_cansleep(mute_gpio, 1);
-+ }
-+}
-+
-+static int snd_rpi_iqaudio_set_bias_level(struct snd_soc_card *card,
-+ struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level)
-+{
-+ struct snd_soc_pcm_runtime *rtd;
-+ struct snd_soc_dai *codec_dai;
-+
-+ rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
-+ codec_dai = rtd->codec_dai;
-+
-+ if (dapm->dev != codec_dai->dev)
-+ return 0;
-+
-+ switch (level) {
-+ case SND_SOC_BIAS_PREPARE:
-+ if (dapm->bias_level != SND_SOC_BIAS_STANDBY)
-+ break;
-+
-+ /* UNMUTE AMP */
-+ snd_rpi_iqaudio_gpio_unmute(card);
-+
-+ break;
-+ case SND_SOC_BIAS_STANDBY:
-+ if (dapm->bias_level != SND_SOC_BIAS_PREPARE)
-+ break;
-+
-+ /* MUTE AMP */
-+ snd_rpi_iqaudio_gpio_mute(card);
-+
-+ break;
-+ default:
-+ break;
-+ }
-+
-+ return 0;
-+}
-+
-+static struct snd_soc_dai_link snd_rpi_iqaudio_dac_dai[] = {
-+{
-+ .cpu_dai_name = "bcm2708-i2s.0",
-+ .codec_dai_name = "pcm512x-hifi",
-+ .platform_name = "bcm2708-i2s.0",
-+ .codec_name = "pcm512x.1-004c",
-+ .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
-+ SND_SOC_DAIFMT_CBS_CFS,
-+ .init = snd_rpi_iqaudio_dac_init,
-+},
-+};
-+
-+/* audio machine driver */
-+static struct snd_soc_card snd_rpi_iqaudio_dac = {
-+ .owner = THIS_MODULE,
-+ .dai_link = snd_rpi_iqaudio_dac_dai,
-+ .num_links = ARRAY_SIZE(snd_rpi_iqaudio_dac_dai),
-+};
-+
-+static int snd_rpi_iqaudio_dac_probe(struct platform_device *pdev)
-+{
-+ int ret = 0;
-+ bool gpio_unmute = false;
-+
-+ snd_rpi_iqaudio_dac.dev = &pdev->dev;
-+
-+ if (pdev->dev.of_node) {
-+ struct device_node *i2s_node;
-+ struct snd_soc_card *card = &snd_rpi_iqaudio_dac;
-+ struct snd_soc_dai_link *dai = &snd_rpi_iqaudio_dac_dai[0];
-+ bool auto_gpio_mute = false;
-+
-+ 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, "iqaudio,24db_digital_gain");
-+
-+ if (of_property_read_string(pdev->dev.of_node, "card_name",
-+ &card->name))
-+ card->name = "IQaudIODAC";
-+
-+ if (of_property_read_string(pdev->dev.of_node, "dai_name",
-+ &dai->name))
-+ dai->name = "IQaudIO DAC";
-+
-+ if (of_property_read_string(pdev->dev.of_node,
-+ "dai_stream_name", &dai->stream_name))
-+ dai->stream_name = "IQaudIO DAC HiFi";
-+
-+ /* gpio_unmute - one time unmute amp using GPIO */
-+ gpio_unmute = of_property_read_bool(pdev->dev.of_node,
-+ "iqaudio-dac,unmute-amp");
-+
-+ /* auto_gpio_mute - mute/unmute amp using GPIO */
-+ auto_gpio_mute = of_property_read_bool(pdev->dev.of_node,
-+ "iqaudio-dac,auto-mute-amp");
-+
-+ if (auto_gpio_mute || gpio_unmute) {
-+ mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute",
-+ GPIOD_OUT_LOW);
-+ if (IS_ERR(mute_gpio)) {
-+ ret = PTR_ERR(mute_gpio);
-+ dev_err(&pdev->dev,
-+ "Failed to get mute gpio: %d\n", ret);
-+ return ret;
-+ }
-+
-+ if (auto_gpio_mute && mute_gpio)
-+ snd_rpi_iqaudio_dac.set_bias_level =
-+ snd_rpi_iqaudio_set_bias_level;
-+ }
-+ }
-+
-+ ret = snd_soc_register_card(&snd_rpi_iqaudio_dac);
-+ if (ret) {
-+ if (ret != -EPROBE_DEFER)
-+ dev_err(&pdev->dev,
-+ "snd_soc_register_card() failed: %d\n", ret);
-+ return ret;
-+ }
-+
-+ if (gpio_unmute && mute_gpio)
-+ snd_rpi_iqaudio_gpio_unmute(&snd_rpi_iqaudio_dac);
-+
-+ return 0;
-+}
-+
-+static int snd_rpi_iqaudio_dac_remove(struct platform_device *pdev)
-+{
-+ snd_rpi_iqaudio_gpio_mute(&snd_rpi_iqaudio_dac);
-+
-+ return snd_soc_unregister_card(&snd_rpi_iqaudio_dac);
-+}
-+
-+static const struct of_device_id iqaudio_of_match[] = {
-+ { .compatible = "iqaudio,iqaudio-dac", },
-+ {},
-+};
-+MODULE_DEVICE_TABLE(of, iqaudio_of_match);
-+
-+static struct platform_driver snd_rpi_iqaudio_dac_driver = {
-+ .driver = {
-+ .name = "snd-rpi-iqaudio-dac",
-+ .owner = THIS_MODULE,
-+ .of_match_table = iqaudio_of_match,
-+ },
-+ .probe = snd_rpi_iqaudio_dac_probe,
-+ .remove = snd_rpi_iqaudio_dac_remove,
-+};
-+
-+module_platform_driver(snd_rpi_iqaudio_dac_driver);
-+
-+MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
-+MODULE_DESCRIPTION("ASoC Driver for IQAudio DAC");
-+MODULE_LICENSE("GPL v2");
projects / openwrt / staging / chunkeey.git / blobdiff