linux-kernel - Re: [PATCH] platform/x86: dell-laptop: Register ctl-led for speaker-mute

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Message-ID: <a83d9acd-a2c5-85ce-36dc-c6a8f0e11a66@redhat.com>
Date:   Tue, 7 Mar 2023 13:09:58 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Koba Ko <koba.ko@...onical.com>, Mark Gross <markgross@...nel.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: dell-laptop: Register ctl-led for
 speaker-mute

Hi,

On 3/6/23 15:24, Koba Ko wrote:
> Some platforms have the speaker-mute led and
> current driver doesn't control it.
> 
> If the platform support the control of speaker-mute led, register it
> 
> Signed-off-by: Koba Ko <koba.ko@...onical.com>

Thank you for your patch, one small remark below.

> ---
>  drivers/platform/x86/dell/dell-laptop.c | 43 +++++++++++++++++++++++++
>  drivers/platform/x86/dell/dell-smbios.h |  2 ++
>  2 files changed, 45 insertions(+)
> 
> diff --git a/drivers/platform/x86/dell/dell-laptop.c b/drivers/platform/x86/dell/dell-laptop.c
> index 1321687d923ed..38d95bae8e3ab 100644
> --- a/drivers/platform/x86/dell/dell-laptop.c
> +++ b/drivers/platform/x86/dell/dell-laptop.c
> @@ -97,6 +97,7 @@ static struct rfkill *bluetooth_rfkill;
>  static struct rfkill *wwan_rfkill;
>  static bool force_rfkill;
>  static bool micmute_led_registered;
> +static bool mute_led_registered;
>  
>  module_param(force_rfkill, bool, 0444);
>  MODULE_PARM_DESC(force_rfkill, "enable rfkill on non whitelisted models");
> @@ -2177,6 +2178,34 @@ static struct led_classdev micmute_led_cdev = {
>  	.default_trigger = "audio-micmute",
>  };
>  
> +static int mute_led_set(struct led_classdev *led_cdev,
> +			   enum led_brightness brightness)
> +{
> +	struct calling_interface_buffer buffer;
> +	struct calling_interface_token *token;
> +	int state = brightness != LED_OFF;
> +
> +	if (state == 0)
> +		token = dell_smbios_find_token(GLOBAL_MUTE_DISABLE);
> +	else
> +		token = dell_smbios_find_token(GLOBAL_MUTE_ENABLE);
> +
> +	if (!token)
> +		return -ENODEV;
> +
> +	dell_fill_request(&buffer, token->location, token->value, 0, 0);
> +	dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
> +
> +	return 0;
> +}
> +
> +static struct led_classdev mute_led_cdev = {
> +	.name = "platform::mute",
> +	.max_brightness = 1,
> +	.brightness_set_blocking = mute_led_set,
> +	.default_trigger = "audio-mute",
> +};
> +
>  static int __init dell_init(void)
>  {
>  	struct calling_interface_token *token;
> @@ -2230,6 +2259,16 @@ static int __init dell_init(void)
>  		micmute_led_registered = true;
>  	}
>  
> +	if (dell_smbios_find_token(GLOBAL_MUTE_DISABLE) &&
> +	    dell_smbios_find_token(GLOBAL_MUTE_ENABLE) &&
> +	    !dell_privacy_has_mic_mute()) {

Since this is a speaker mute LED and since the Dell hw privacy
stuff does not deal with the speaker at all, I believe that you
should drop the "&& !dell_privacy_has_mic_mute()" part of
the if condition here ?

Can you please send a new version with this dropped?

Regards,

Hans


> +		mute_led_cdev.brightness = ledtrig_audio_get(LED_AUDIO_MUTE);
> +		ret = led_classdev_register(&platform_device->dev, &mute_led_cdev);
> +		if (ret < 0)
> +			goto fail_led;
> +		mute_led_registered = true;
> +	}
> +
>  	if (acpi_video_get_backlight_type() != acpi_backlight_vendor)
>  		return 0;
>  
> @@ -2277,6 +2316,8 @@ static int __init dell_init(void)
>  fail_backlight:
>  	if (micmute_led_registered)
>  		led_classdev_unregister(&micmute_led_cdev);
> +	if (mute_led_registered)
> +		led_classdev_unregister(&mute_led_cdev);
>  fail_led:
>  	dell_cleanup_rfkill();
>  fail_rfkill:
> @@ -2299,6 +2340,8 @@ static void __exit dell_exit(void)
>  	backlight_device_unregister(dell_backlight_device);
>  	if (micmute_led_registered)
>  		led_classdev_unregister(&micmute_led_cdev);
> +	if (mute_led_registered)
> +		led_classdev_unregister(&mute_led_cdev);
>  	dell_cleanup_rfkill();
>  	if (platform_device) {
>  		platform_device_unregister(platform_device);
> diff --git a/drivers/platform/x86/dell/dell-smbios.h b/drivers/platform/x86/dell/dell-smbios.h
> index 75fa8ea0476dc..eb341bf000c67 100644
> --- a/drivers/platform/x86/dell/dell-smbios.h
> +++ b/drivers/platform/x86/dell/dell-smbios.h
> @@ -34,6 +34,8 @@
>  #define KBD_LED_AUTO_100_TOKEN	0x02F6
>  #define GLOBAL_MIC_MUTE_ENABLE	0x0364
>  #define GLOBAL_MIC_MUTE_DISABLE	0x0365
> +#define GLOBAL_MUTE_ENABLE	0x058C
> +#define GLOBAL_MUTE_DISABLE	0x058D
>  
>  struct notifier_block;
>