linux-kernel - Re: [PATCH 4/9] platform/x86: asus-wmi: support toggling POST sound

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Message-ID: <88b7d5b0-23af-37e0-6122-fc790ae57053@linux.intel.com>
Date: Mon, 25 Mar 2024 16:02:04 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: "Luke D. Jones" <luke@...nes.dev>
cc: Hans de Goede <hdegoede@...hat.com>, corentin.chary@...il.com, 
    platform-driver-x86@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/9] platform/x86: asus-wmi: support toggling POST
 sound

On Mon, 25 Mar 2024, Luke D. Jones wrote:

> Add support for toggling the BIOS POST sound on some ASUS laptops.
> 
> Signed-off-by: Luke D. Jones <luke@...nes.dev>
> ---
>  .../ABI/testing/sysfs-platform-asus-wmi       |  9 ++++
>  drivers/platform/x86/asus-wmi.c               | 51 +++++++++++++++++++
>  include/linux/platform_data/x86/asus-wmi.h    |  3 ++
>  3 files changed, 63 insertions(+)
> 
> diff --git a/Documentation/ABI/testing/sysfs-platform-asus-wmi b/Documentation/ABI/testing/sysfs-platform-asus-wmi
> index 61a745d2476f..5645dbac4ce8 100644
> --- a/Documentation/ABI/testing/sysfs-platform-asus-wmi
> +++ b/Documentation/ABI/testing/sysfs-platform-asus-wmi
> @@ -194,3 +194,12 @@ Contact:	"Luke Jones" <luke@...nes.dev>
>  Description:
>  		Set the target temperature limit of the Nvidia dGPU:
>  			* min=75, max=87
> +
> +What:		/sys/devices/platform/<platform>/boot_sound
> +Date:		Jun 2023
> +KernelVersion:	6.10
> +Contact:	"Luke Jones" <luke@...nes.dev>
> +Description:
> +		Set if the BIOS POST sound is played on boot.
> +			* 0 - False,
> +			* 1 - True
> \ No newline at end of file
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 094a93f24667..6cac9c3eb8b2 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -2106,6 +2106,54 @@ static ssize_t panel_od_store(struct device *dev,
>  }
>  static DEVICE_ATTR_RW(panel_od);
>  
> +/* Bootup sound ***************************************************************/
> +
> +static ssize_t boot_sound_show(struct device *dev,
> +			     struct device_attribute *attr, char *buf)
> +{
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +	int result;
> +
> +	result = asus_wmi_get_devstate_simple(asus, ASUS_WMI_DEVID_BOOT_SOUND);
> +	if (result < 0)
> +		return result;
> +
> +	return sysfs_emit(buf, "%d\n", result);
> +}
> +
> +static ssize_t boot_sound_store(struct device *dev,
> +			      struct device_attribute *attr,
> +			      const char *buf, size_t count)
> +{
> +	int result, err;
> +	u32 snd;
> +
> +	struct asus_wmi *asus = dev_get_drvdata(dev);
> +
> +	result = kstrtou32(buf, 10, &snd);
> +	if (result)
> +		return result;
> +
> +	if (snd > 1)
> +		return -EINVAL;
> +
> +	err = asus_wmi_set_devstate(ASUS_WMI_DEVID_BOOT_SOUND, snd, &result);
> +	if (err) {
> +		pr_warn("Failed to set boot sound: %d\n", err);
> +		return err;
> +	}
> +
> +	if (result > 1) {
> +		pr_warn("Failed to set panel boot sound (result): 0x%x\n", result);
> +		return -EIO;
> +	}
> +
> +	sysfs_notify(&asus->platform_device->dev.kobj, NULL, "boot_sound");
> +
> +	return count;
> +}
> +static DEVICE_ATTR_RW(boot_sound);

I started to think that perhaps these would be a way to create helper for 
these sysfs functions to call as they are quite similar, only the wmi id, 
strings and the range check change (the GPU functions do a few extra 
checks and could remain standalone functions but the rest look very 
similar to each other).

-- 
 i.