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

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Message-ID: <CAJB-X+X83dLFsOyYON9zLQxOVukg7bcrikRohn4sRR6UiSUbOQ@mail.gmail.com>
Date:   Wed, 8 Mar 2023 14:25:44 +0800
From:   Koba Ko <koba.ko@...onical.com>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     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

On Tue, Mar 7, 2023 at 8:10 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> 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?

Sure, have sent v2 with dell_privacy_has_mic_mute dropped
Thanks

>
> 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;
> >
>