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From 98f0214603229df4038cc0d318111a37b10078a1 Mon Sep 17 00:00:00 2001
From: DigitalDreamtime <clive.messer@digitaldreamtime.co.uk>
Date: Mon, 9 May 2016 20:38:08 +0100
Subject: [PATCH] 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>
---
arch/arm/boot/dts/overlays/README | 4 +
.../boot/dts/overlays/iqaudio-dacplus-overlay.dts | 7 +-
sound/soc/bcm/iqaudio-dac.c | 144 ++++++++++++++++-----
3 files changed, 124 insertions(+), 31 deletions(-)
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -540,6 +540,10 @@ Params: 24db_digital_gain Allow ga
responsibility of the user to ensure that
the Digital volume control is set to a value
that does not result in clipping/distortion!)
+ auto_mute_amp If specified, unmute/mute the IQaudIO amp when
+ starting/stopping audio playback.
+ unmute_amp If specified, unmute the IQaudIO amp once when
+ the DAC driver module loads.
Name: justboom-dac
--- a/arch/arm/boot/dts/overlays/iqaudio-dacplus-overlay.dts
+++ b/arch/arm/boot/dts/overlays/iqaudio-dacplus-overlay.dts
@@ -30,14 +30,17 @@
fragment@2 {
target = <&sound>;
- frag2: __overlay__ {
+ iqaudio_dac: __overlay__ {
compatible = "iqaudio,iqaudio-dac";
i2s-controller = <&i2s>;
+ mute-gpios = <&gpio 22 0>;
status = "okay";
};
};
__overrides__ {
- 24db_digital_gain = <&frag2>,"iqaudio,24db_digital_gain?";
+ 24db_digital_gain = <&iqaudio_dac>,"iqaudio,24db_digital_gain?";
+ auto_mute_amp = <&iqaudio_dac>,"iqaudio-dac,auto-mute-amp?";
+ unmute_amp = <&iqaudio_dac>,"iqaudio-dac,unmute-amp?";
};
};
--- a/sound/soc/bcm/iqaudio-dac.c
+++ b/sound/soc/bcm/iqaudio-dac.c
@@ -15,6 +15,7 @@
*/
#include <linux/module.h>
+#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <sound/core.h>
@@ -25,6 +26,8 @@
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)
@@ -41,11 +44,9 @@ static int snd_rpi_iqaudio_dac_init(stru
}
static int snd_rpi_iqaudio_dac_hw_params(struct snd_pcm_substream *substream,
- struct snd_pcm_hw_params *params)
+ struct snd_pcm_hw_params *params)
{
struct snd_soc_pcm_runtime *rtd = substream->private_data;
-// NOT USED struct snd_soc_dai *codec_dai = rtd->codec_dai;
-// NOT USED struct snd_soc_codec *codec = rtd->codec;
struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
unsigned int sample_bits =
@@ -54,6 +55,56 @@ static int snd_rpi_iqaudio_dac_hw_params
return snd_soc_dai_set_bclk_ratio(cpu_dai, sample_bits * 2);
}
+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_dai *codec_dai = card->rtd[0].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;
+}
+
/* machine stream operations */
static struct snd_soc_ops snd_rpi_iqaudio_dac_ops = {
.hw_params = snd_rpi_iqaudio_dac_hw_params,
@@ -82,46 +133,81 @@ static struct snd_soc_card snd_rpi_iqaud
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];
- 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";
+ 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) {
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 ret;
+ 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);
}
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