linux-kernel - Re: [PATCH] Make top/rear speaker, mute and micmute leds work on HP x360 14-ea000 laptops that use Realtek 245 codec

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Date:   Sat, 30 Oct 2021 12:01:03 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Jonathan Clarke <jonathan.a.clarke@...il.com>
Cc:     linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.com>,
        alsa-devel@...a-project.org
Subject: Re: [PATCH] Make top/rear speaker, mute and micmute leds work on HP x360 14-ea000 laptops that use Realtek 245 codec

On Fri, 29 Oct 2021 17:43:13 +0200,
Jonathan Clarke wrote:
> 
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=210633
> Signed-off-by: Jonathan Clarke <jonathan.a.clarke@...il.com>

Could you give more descriptions?  The patch isn't trivial at all, and
it needs more explanations.

> ---
>  sound/pci/hda/patch_realtek.c | 46 +++++++++++++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
> 
> diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
> index 22d27b12c..e3c6d17ea 100644
> --- a/sound/pci/hda/patch_realtek.c
> +++ b/sound/pci/hda/patch_realtek.c
> @@ -4409,6 +4409,13 @@ static void alc245_fixup_hp_x360_amp(struct hda_codec *codec,
>  	case HDA_FIXUP_ACT_PRE_PROBE:
>  		spec->gpio_mask |= 0x01;
>  		spec->gpio_dir |= 0x01;
> +
> +		/* use only amp at 0x02 for bottom(front) speaker,
> +		 * otherwise it is set to use 0x02,0x03,0x06 and when used in conjunction
> +		 * with top(rear) speaker 0x14, gets locked at full volume */
> +		static const hda_nid_t conn1[] = { 0x02 };
> +		snd_hda_override_conn_list(codec, 0x17, ARRAY_SIZE(conn1), conn1);
> +
>  		break;
>  	case HDA_FIXUP_ACT_INIT:
>  		/* need to toggle GPIO to enable the amp */
> @@ -4503,6 +4510,26 @@ static void alc236_fixup_hp_mute_led_coefbit(struct hda_codec *codec,
>  	}
>  }
>  
> +static void alc245_fixup_hp_x360_mute_leds(struct hda_codec *codec,
> +				const struct hda_fixup *fix, int action)
> +{
> +	struct alc_spec *spec = codec->spec;
> +	if (action == HDA_FIXUP_ACT_PRE_PROBE) {
> +		/* mic mute is set via gpio 0x04 */
> +		spec->micmute_led_polarity = 1;
> +		codec->power_filter = led_power_filter;
> +		alc_fixup_hp_gpio_led(codec, action, 0x00, 0x04);
> +
> +		/* output mute is set via SET_COEF_INDEX,SET_PROC_COEF */
> +		spec->mute_led_polarity = 0;
> +		spec->mute_led_coef.idx = 0x0b;
> +		spec->mute_led_coef.mask = 0xffff;
> +		spec->mute_led_coef.on = 0xa02f;
> +		spec->mute_led_coef.off = 0x7774;
> +		snd_hda_gen_add_mute_led_cdev(codec, coef_mute_led_set);

I guess this COEF isn't only about mute-LED but actually does mute the
output?  IIRC, the bit 0x08 corresponds to the LED.  If so, it's
better to split.  Basically this snd_hda_gen_add_mute_led_cdev() and
mute_led_coef stuff are only for the mute LED control.  e.g. you can
change the mute LED independently via sysfs.


thanks,

Takashi