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331 lines
9.6 KiB
331 lines
9.6 KiB
![]()
6 years ago
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From d79b90e9d5f9d873f4366004ac7bb4aa46a8db2e Mon Sep 17 00:00:00 2001
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From: Gordon Garrity <gordon@iqaudio.com>
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Date: Sat, 8 Mar 2014 16:56:57 +0000
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Subject: [PATCH 068/454] Add IQaudIO Sound Card support for Raspberry Pi
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Set a limit of 0dB on Digital Volume Control
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The main volume control in the PCM512x DAC has a range up to
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+24dB. This is dangerously loud and can potentially cause massive
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clipping in the output stages. Therefore this sets a sensible
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limit of 0dB for this control.
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Allow up to 24dB digital gain to be applied when using IQAudIO DAC+
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24db_digital_gain DT param can be used to specify that PCM512x
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codec "Digital" volume control should not be limited to 0dB gain,
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and if specified will allow the full 24dB gain.
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Modify IQAudIO DAC+ ASoC driver to set card/dai config from dt
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Add the ability to set the card name, dai name and dai stream name, from
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dt config.
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Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
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IQaudIO: auto-mute for AMP+ and DigiAMP+
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IQAudIO amplifier mute via GPIO22. Add dt params for "one-shot" unmute
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and auto mute.
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Revision 2, auto mute implementing HiassofT suggestion to mute/unmute
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using set_bias_level, rather than startup/shutdown....
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"By default DAPM waits 5 seconds (pmdown_time) before shutting down
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playback streams so a close/stop immediately followed by open/start
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doesn't trigger an amp mute+unmute."
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Tested on both AMP+ (via DAC+) and DigiAMP+, with both options...
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dtoverlay=iqaudio-dacplus,unmute_amp
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"one-shot" unmute when kernel module loads.
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dtoverlay=iqaudio-dacplus,auto_mute_amp
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Unmute amp when ALSA device opened by a client. Mute, with 5 second delay
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when ALSA device closed. (Re-opening the device within the 5 second close
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window, will cancel mute.)
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Revision 4, using gpiod.
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Revision 5, clean-up formatting before adding mute code.
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- Convert tab plus 4 space formatting to 2x tab
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- Remove '// NOT USED' commented code
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Revision 6, don't attempt to "one-shot" unmute amp, unless card is
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successfully registered.
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Signed-off-by: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
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---
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sound/soc/bcm/Kconfig | 7 ++
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sound/soc/bcm/Makefile | 2 +
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sound/soc/bcm/iqaudio-dac.c | 239 ++++++++++++++++++++++++++++++++++++
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3 files changed, 248 insertions(+)
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create mode 100644 sound/soc/bcm/iqaudio-dac.c
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--- a/sound/soc/bcm/Kconfig
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+++ b/sound/soc/bcm/Kconfig
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@@ -38,3 +38,10 @@ config SND_BCM2708_SOC_RPI_DAC
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select SND_SOC_PCM1794A
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help
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Say Y or M if you want to add support for RPi-DAC.
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+
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+config SND_BCM2708_SOC_IQAUDIO_DAC
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+ tristate "Support for IQaudIO-DAC"
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+ depends on SND_BCM2708_SOC_I2S || SND_BCM2835_SOC_I2S
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+ select SND_SOC_PCM512x_I2C
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+ help
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+ Say Y or M if you want to add support for IQaudIO-DAC.
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--- a/sound/soc/bcm/Makefile
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+++ b/sound/soc/bcm/Makefile
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@@ -12,7 +12,9 @@ obj-$(CONFIG_SND_SOC_CYGNUS) += snd-soc-
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snd-soc-hifiberry-dac-objs := hifiberry_dac.o
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snd-soc-hifiberry-digi-objs := hifiberry_digi.o
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snd-soc-rpi-dac-objs := rpi-dac.o
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+snd-soc-iqaudio-dac-objs := iqaudio-dac.o
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obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DAC) += snd-soc-hifiberry-dac.o
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obj-$(CONFIG_SND_BCM2708_SOC_HIFIBERRY_DIGI) += snd-soc-hifiberry-digi.o
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obj-$(CONFIG_SND_BCM2708_SOC_RPI_DAC) += snd-soc-rpi-dac.o
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+obj-$(CONFIG_SND_BCM2708_SOC_IQAUDIO_DAC) += snd-soc-iqaudio-dac.o
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--- /dev/null
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+++ b/sound/soc/bcm/iqaudio-dac.c
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@@ -0,0 +1,239 @@
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+/*
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+ * ASoC Driver for IQaudIO DAC
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+ *
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+ * Author: Florian Meier <florian.meier@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
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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/gpio/consumer.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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+#include <sound/jack.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 struct gpio_desc *mute_gpio;
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+
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+static int snd_rpi_iqaudio_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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+ {
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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", 207);
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+ if (ret < 0)
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+ dev_warn(card->dev, "Failed to set volume limit: %d\n", 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 int snd_rpi_iqaudio_dac_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 *cpu_dai = rtd->cpu_dai;
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+
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+ unsigned int sample_bits =
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+ snd_pcm_format_physical_width(params_format(params));
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+
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+ return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
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+}
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+
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+static void snd_rpi_iqaudio_gpio_mute(struct snd_soc_card *card)
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+{
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+ if (mute_gpio) {
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+ dev_info(card->dev, "%s: muting amp using GPIO22\n",
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+ __func__);
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+ gpiod_set_value_cansleep(mute_gpio, 0);
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+ }
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+}
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+
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+static void snd_rpi_iqaudio_gpio_unmute(struct snd_soc_card *card)
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+{
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+ if (mute_gpio) {
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+ dev_info(card->dev, "%s: un-muting amp using GPIO22\n",
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+ __func__);
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+ gpiod_set_value_cansleep(mute_gpio, 1);
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+ }
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+}
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+
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+static int snd_rpi_iqaudio_set_bias_level(struct snd_soc_card *card,
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+ struct snd_soc_dapm_context *dapm, enum snd_soc_bias_level level)
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+{
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+ struct snd_soc_pcm_runtime *rtd;
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+ struct snd_soc_dai *codec_dai;
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+
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+ rtd = snd_soc_get_pcm_runtime(card, card->dai_link[0].name);
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+ codec_dai = rtd->codec_dai;
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+
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+ if (dapm->dev != codec_dai->dev)
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+ return 0;
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+
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+ switch (level) {
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+ case SND_SOC_BIAS_PREPARE:
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+ if (dapm->bias_level != SND_SOC_BIAS_STANDBY)
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+ break;
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+
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+ /* UNMUTE AMP */
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+ snd_rpi_iqaudio_gpio_unmute(card);
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+
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+ break;
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+ case SND_SOC_BIAS_STANDBY:
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+ if (dapm->bias_level != SND_SOC_BIAS_PREPARE)
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+ break;
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+
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+ /* MUTE AMP */
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+ snd_rpi_iqaudio_gpio_mute(card);
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+
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+ break;
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+ default:
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+ break;
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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_iqaudio_dac_ops = {
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+ .hw_params = snd_rpi_iqaudio_dac_hw_params,
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+};
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+
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+static struct snd_soc_dai_link snd_rpi_iqaudio_dac_dai[] = {
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+{
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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 | SND_SOC_DAIFMT_NB_NF |
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+ SND_SOC_DAIFMT_CBS_CFS,
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+ .ops = &snd_rpi_iqaudio_dac_ops,
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+ .init = snd_rpi_iqaudio_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_rpi_iqaudio_dac = {
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+ .owner = THIS_MODULE,
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+ .dai_link = snd_rpi_iqaudio_dac_dai,
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+ .num_links = ARRAY_SIZE(snd_rpi_iqaudio_dac_dai),
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+};
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+
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+static int snd_rpi_iqaudio_dac_probe(struct platform_device *pdev)
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+{
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+ int ret = 0;
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+ bool gpio_unmute = false;
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+
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+ snd_rpi_iqaudio_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_card *card = &snd_rpi_iqaudio_dac;
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+ struct snd_soc_dai_link *dai = &snd_rpi_iqaudio_dac_dai[0];
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+ bool auto_gpio_mute = false;
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+
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+ i2s_node = of_parse_phandle(pdev->dev.of_node,
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+ "i2s-controller", 0);
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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, "iqaudio,24db_digital_gain");
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+
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+ if (of_property_read_string(pdev->dev.of_node, "card_name",
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+ &card->name))
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+ card->name = "IQaudIODAC";
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+
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+ if (of_property_read_string(pdev->dev.of_node, "dai_name",
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+ &dai->name))
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+ dai->name = "IQaudIO DAC";
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+
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+ if (of_property_read_string(pdev->dev.of_node,
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+ "dai_stream_name", &dai->stream_name))
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+ dai->stream_name = "IQaudIO DAC HiFi";
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+
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+ /* gpio_unmute - one time unmute amp using GPIO */
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+ gpio_unmute = of_property_read_bool(pdev->dev.of_node,
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+ "iqaudio-dac,unmute-amp");
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+
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+ /* auto_gpio_mute - mute/unmute amp using GPIO */
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+ auto_gpio_mute = of_property_read_bool(pdev->dev.of_node,
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+ "iqaudio-dac,auto-mute-amp");
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+
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+ if (auto_gpio_mute || gpio_unmute) {
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+ mute_gpio = devm_gpiod_get_optional(&pdev->dev, "mute",
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+ GPIOD_OUT_LOW);
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+ if (IS_ERR(mute_gpio)) {
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+ ret = PTR_ERR(mute_gpio);
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+ dev_err(&pdev->dev,
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+ "Failed to get mute gpio: %d\n", ret);
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+ return ret;
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+ }
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+
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+ if (auto_gpio_mute && mute_gpio)
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+ snd_rpi_iqaudio_dac.set_bias_level =
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+ snd_rpi_iqaudio_set_bias_level;
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+ }
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+ }
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+
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+ ret = snd_soc_register_card(&snd_rpi_iqaudio_dac);
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+ if (ret) {
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+ if (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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+ return ret;
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+ }
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+
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+ if (gpio_unmute && mute_gpio)
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+ snd_rpi_iqaudio_gpio_unmute(&snd_rpi_iqaudio_dac);
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+
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+ return 0;
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+}
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+
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+static int snd_rpi_iqaudio_dac_remove(struct platform_device *pdev)
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+{
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+ snd_rpi_iqaudio_gpio_mute(&snd_rpi_iqaudio_dac);
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+
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+ return snd_soc_unregister_card(&snd_rpi_iqaudio_dac);
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+}
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+
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+static const struct of_device_id iqaudio_of_match[] = {
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+ { .compatible = "iqaudio,iqaudio-dac", },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, iqaudio_of_match);
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+
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+static struct platform_driver snd_rpi_iqaudio_dac_driver = {
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+ .driver = {
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+ .name = "snd-rpi-iqaudio-dac",
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+ .owner = THIS_MODULE,
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+ .of_match_table = iqaudio_of_match,
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+ },
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+ .probe = snd_rpi_iqaudio_dac_probe,
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+ .remove = snd_rpi_iqaudio_dac_remove,
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+};
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+
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+module_platform_driver(snd_rpi_iqaudio_dac_driver);
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+
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+MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
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+MODULE_DESCRIPTION("ASoC Driver for IQAudio DAC");
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+MODULE_LICENSE("GPL v2");
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