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