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

["Limonciello, Mario" <Mario.Limonciello@dell.com>]

> >> -----Original Message-----
> >> From: Yuan, Perry <Perry_Yuan@Dell.com>
> >> Sent: Tuesday, January 12, 2021 11:18
> >> To: oder_chiou@realtek.com; perex@perex.cz; tiwai@suse.com;
> >> hdegoede@redhat.com; mgross@linux.intel.com
> >> Cc: lgirdwood@gmail.com; broonie@kernel.org; alsa-devel@alsa-project.org;
> >> linux-kernel@vger.kernel.org; platform-driver-x86@vger.kernel.org; Yuan,
> >> Perry; Limonciello, Mario
> >> Subject: [PATCH v3 3/3] ASoC: rt715:add micmute led state control supports
> >>
> >> From: Perry Yuan <perry_yuan@dell.com>
> >>
> >> 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@dell.com>
> >>
> >> --------
> >> 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

I'm not sure which thread, but I believe there was still also another suggestion
that this should be made more "generic" and to work for all codecs.  So that when
we have lets say a hypothetical rt717 we don't need the same in that module.