Re: [PATCH v3 3/3] ASoC: rt715:add micmute led state control supports

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On 2021/1/13 1:50, Limonciello, Mario wrote:


-----Original Message-----
From: Yuan, Perry <Perry_Yuan@xxxxxxxx>
Sent: Tuesday, January 12, 2021 11:18
To: oder_chiou@xxxxxxxxxxx; perex@xxxxxxxx; tiwai@xxxxxxxx;
hdegoede@xxxxxxxxxx; mgross@xxxxxxxxxxxxxxx
Cc: lgirdwood@xxxxxxxxx; broonie@xxxxxxxxxx; alsa-devel@xxxxxxxxxxxxxxxx;
linux-kernel@xxxxxxxxxxxxxxx; platform-driver-x86@xxxxxxxxxxxxxxx; Yuan,
Perry; Limonciello, Mario
Subject: [PATCH v3 3/3] ASoC: rt715:add micmute led state control supports

From: Perry Yuan <perry_yuan@xxxxxxxx>

Some new Dell system is going to support audio internal micphone
privacy setting from hardware level with micmute led state changing
When micmute hotkey pressed by user, soft mute will need to be enabled
firstly in case of pop noise, and codec driver need to react to mic
mute event to EC(embedded controller) notifying that SW mute is completed
Then EC will do the hardware mute physically within the timeout reached

This patch allow codec rt715 driver to ack EC when micmute key pressed
through this micphone led control interface like hda_generic provided
ACPI method defined in dell-privacy micmute led trigger will be called
for notifying the EC that software mute has been completed

Signed-off-by: Perry Yuan <perry_yuan@xxxxxxxx>

--------
v2 -> v3
* simplify the patch to reuse some val value
* add more detail to the commit info

v1 -> v2:
* fix some format issue
--------
---
  sound/soc/codecs/rt715-sdca.c | 16 ++++++++++++++++
  sound/soc/codecs/rt715-sdca.h |  1 +
  sound/soc/codecs/rt715.c      | 14 ++++++++++++++
  sound/soc/codecs/rt715.h      |  1 +
  4 files changed, 32 insertions(+)

diff --git a/sound/soc/codecs/rt715-sdca.c b/sound/soc/codecs/rt715-sdca.c
index b43ac8559e45..861a0d2a8957 100644
--- a/sound/soc/codecs/rt715-sdca.c
+++ b/sound/soc/codecs/rt715-sdca.c
@@ -12,6 +12,7 @@
  #include <linux/version.h>
  #include <linux/kernel.h>
  #include <linux/init.h>
+#include <linux/leds.h>
  #include <linux/pm_runtime.h>
  #include <linux/pm.h>
  #include <linux/soundwire/sdw.h>
@@ -244,6 +245,7 @@ static int rt715_sdca_get_volsw(struct snd_kcontrol
*kcontrol,
  	unsigned int max = mc->max;
  	int val;

+	pr_err("++++++rt715_sdca_get_volsw++\n");
  	val = snd_soc_component_read(component, mc->reg);
  	if (val < 0)
  		return -EINVAL;
@@ -261,6 +263,7 @@ static int rt715_sdca_put_volsw(struct snd_kcontrol
*kcontrol,
  	struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
+	struct rt715_sdca_priv *rt715 =
snd_soc_component_get_drvdata(component);
  	struct soc_mixer_control *mc =
  		(struct soc_mixer_control *)kcontrol->private_value;
  	unsigned int val, val2, loop_cnt = 2, i;
@@ -268,6 +271,7 @@ static int rt715_sdca_put_volsw(struct snd_kcontrol
*kcontrol,
  	unsigned int reg2 = mc->rreg;
  	unsigned int reg = mc->reg;
  	unsigned int max = mc->max;
+	unsigned int val0, val1;
  	int err;

  	val = ucontrol->value.integer.value[0];
@@ -287,6 +291,18 @@ static int rt715_sdca_put_volsw(struct snd_kcontrol
*kcontrol,
  			return err;
  	}

+#if IS_ENABLED(CONFIG_DELL_PRIVACY)
+	/* dell privacy LED trigger state changed by muted/unmute switch */
+	if (mc->invert) {
+		if (ucontrol->value.integer.value[0] || ucontrol-

value.integer.value[1]) {

+			rt715->micmute_led = LED_OFF;
+		} else {
+			rt715->micmute_led = LED_ON;
+		}
+		ledtrig_audio_set(LED_AUDIO_MICMUTE, rt715->micmute_led);
+	}
+#endif
+
  	return 0;
  }

diff --git a/sound/soc/codecs/rt715-sdca.h b/sound/soc/codecs/rt715-sdca.h
index 840c237895dd..f8988ab88f80 100644
--- a/sound/soc/codecs/rt715-sdca.h
+++ b/sound/soc/codecs/rt715-sdca.h
@@ -31,6 +31,7 @@ struct rt715_sdca_priv {
  	int l_is_unmute;
  	int r_is_unmute;
  	int hw_sdw_ver;
+	bool micmute_led;
  };

  struct rt715_sdw_stream_data {
diff --git a/sound/soc/codecs/rt715.c b/sound/soc/codecs/rt715.c
index cdcba70146da..b4e480744c94 100644
--- a/sound/soc/codecs/rt715.c
+++ b/sound/soc/codecs/rt715.c
@@ -13,6 +13,7 @@
  #include <linux/init.h>
  #include <linux/delay.h>
  #include <linux/i2c.h>
+#include <linux/leds.h>
  #include <linux/pm_runtime.h>
  #include <linux/pm.h>
  #include <linux/soundwire/sdw.h>
@@ -88,6 +89,7 @@ static int rt715_set_amp_gain_put(struct snd_kcontrol
*kcontrol,
  		RT715_SET_GAIN_MIX_ADC2_L};
  	unsigned int addr_h, addr_l, val_h, val_ll, val_lr;
  	unsigned int read_ll, read_rl, i, j, loop_cnt;
+	unsigned int val0, val1;

  	if (strstr(ucontrol->id.name, "Main Capture Switch") ||
  		strstr(ucontrol->id.name, "Main Capture Volume"))
@@ -95,6 +97,18 @@ static int rt715_set_amp_gain_put(struct snd_kcontrol
*kcontrol,
  	else
  		loop_cnt = 1;

+#if IS_ENABLED(CONFIG_DELL_PRIVACY)
+	/* Micmute LED state changed by muted/unmute switch */
+	if (mc->invert) {
+		if (ucontrol->value.integer.value[0] || ucontrol-

value.integer.value[1]) {

+			rt715->micmute_led = LED_OFF;
+		} else {
+			rt715->micmute_led = LED_ON;
+		}
+		ledtrig_audio_set(LED_AUDIO_MICMUTE, rt715->micmute_led);
+	}
+#endif
+

You might have missed my other comment on v2 feedback, but is there a reason
to keep it behind a compile time flag for dell privacy module?  In practice
any other future led backend provider should work too.  Another way to think
about it - if dell privacy wasn't enabled would this cause a problem to run
this code?  I think it would just be a no-op.


  	for (j = 0; j < loop_cnt; j++) {
  		/* Can't use update bit function, so read the original value first
*/
  		if (loop_cnt == 1) {
diff --git a/sound/soc/codecs/rt715.h b/sound/soc/codecs/rt715.h
index 009a8266f606..57c9af041181 100644
--- a/sound/soc/codecs/rt715.h
+++ b/sound/soc/codecs/rt715.h
@@ -22,6 +22,7 @@ struct rt715_priv {
  	struct sdw_bus_params params;
  	bool hw_init;
  	bool first_hw_init;
+	bool micmute_led;
  };

  struct sdw_stream_data {
--
2.25.1


Pierre Louis suggested to just set the mic mute led state unconditionally .
It is more common interface to allow other platforms to change micmute led.
The discussion result is from "[PATCH v2 2/2] ASoC: rt715:add Mic Mute LED control support"

Here is the change compared to V3 ,the CONFIG_DELL_PRIVACY will be removed

-#if IS_ENABLED(CONFIG_DELL_PRIVACY)
-       /* dell privacy LED trigger state changed by muted/unmute switch */
+       /* MicMute LED state changed by muted/unmute switch */
        if (mc->invert) {
                if (ucontrol->value.integer.value[0] || ucontrol->value.integer.value[1]) {
                        rt715->micmute_led = LED_OFF;
diff --git a/sound/soc/codecs/rt715.c b/sound/soc/codecs/rt715.c
index b4e480744c94..60bb3d98103e 100644
--- a/sound/soc/codecs/rt715.c
+++ b/sound/soc/codecs/rt715.c
@@ -97,8 +97,7 @@ static int rt715_set_amp_gain_put(struct snd_kcontrol *kcontrol,
        else
                loop_cnt = 1;
-#if IS_ENABLED(CONFIG_DELL_PRIVACY) 
-       /* Micmute LED state changed by muted/unmute switch */
+       /* MicMute LED state changed by muted/unmute switch */
        if (mc->invert) {
                if (ucontrol->value.integer.value[0] || ucontrol->value.integer.value[1]) {
                        rt715->micmute_led = LED_OFF;
@@ -107,7 +106,6 @@ static int rt715_set_amp_gain_put(struct snd_kcontrol *kcontrol,
                }
                ledtrig_audio_set(LED_AUDIO_MICMUTE, rt715->micmute_led);
        }
-#endif
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