mirror of https://github.com/hak5/openwrt.git
273 lines
8.2 KiB
Diff
273 lines
8.2 KiB
Diff
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);
|
|
}
|
|
|