linux-kernel - Re: [PATCH v4] HID: apple: Properly handle function keys on non-Apple keyboard

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Date:   Wed, 1 Jun 2022 19:49:56 +0200
From:   José Expósito <jose.exposito89@...il.com>
To:     Hilton Chain <hako@...rarare.space>
Cc:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: [PATCH v4] HID: apple: Properly handle function keys on
 non-Apple keyboard

On Wed, Jun 01, 2022 at 12:17:37PM +0800, Hilton Chain wrote:
> This commit extends fa33382c7f74 ("HID: apple: Properly handle function
> keys on Keychron keyboards") by adding an array of known non-Apple
> keyboards' device names, and the function apple_is_non_apple_keyboard()
> to identify and create exception for them.
> 
> Signed-off-by: Hilton Chain <hako@...rarare.space>


v4 looks good to me, thanks for adding the suggested changes!

Reviewed-by: José Expósito <jose.exposito89@...il.com>


> ---
> 
> V3 -> V4: Removed unnecessary strlen()
> 
>  drivers/hid/hid-apple.c | 33 ++++++++++++++++++++++++++++-----
>  1 file changed, 28 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/hid/hid-apple.c b/drivers/hid/hid-apple.c
> index 42a568902f49..4ec39c5e762a 100644
> --- a/drivers/hid/hid-apple.c
> +++ b/drivers/hid/hid-apple.c
> @@ -36,7 +36,7 @@
>  #define APPLE_NUMLOCK_EMULATION	BIT(8)
>  #define APPLE_RDESC_BATTERY	BIT(9)
>  #define APPLE_BACKLIGHT_CTL	BIT(10)
> -#define APPLE_IS_KEYCHRON	BIT(11)
> +#define APPLE_IS_NON_APPLE	BIT(11)
>  
>  #define APPLE_FLAG_FKEY		0x01
>  
> @@ -65,6 +65,10 @@ MODULE_PARM_DESC(swap_fn_leftctrl, "Swap the Fn and left Control keys. "
>  		"(For people who want to keep PC keyboard muscle memory. "
>  		"[0] = as-is, Mac layout, 1 = swapped, PC layout)");
>  
> +struct apple_non_apple_keyboard {
> +	char *name;
> +};
> +
>  struct apple_sc_backlight {
>  	struct led_classdev cdev;
>  	struct hid_device *hdev;
> @@ -313,6 +317,25 @@ static const struct apple_key_translation swapped_fn_leftctrl_keys[] = {
>  	{ }
>  };
>  
> +static const struct apple_non_apple_keyboard non_apple_keyboards[] = {
> +	{ "SONiX USB DEVICE" },
> +	{ "Keychron" },
> +};
> +
> +static bool apple_is_non_apple_keyboard(struct hid_device *hdev)
> +{
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(non_apple_keyboards); i++) {
> +		char *non_apple = non_apple_keyboards[i].name;
> +
> +		if (strncmp(hdev->name, non_apple, strlen(non_apple)) == 0)
> +			return true;
> +	}
> +
> +	return false;
> +}
> +
>  static inline void apple_setup_key_translation(struct input_dev *input,
>  		const struct apple_key_translation *table)
>  {
> @@ -363,7 +386,7 @@ static int hidinput_apple_event(struct hid_device *hid, struct input_dev *input,
>  	}
>  
>  	if (fnmode == 3) {
> -		real_fnmode = (asc->quirks & APPLE_IS_KEYCHRON) ? 2 : 1;
> +		real_fnmode = (asc->quirks & APPLE_IS_NON_APPLE) ? 2 : 1;
>  	} else {
>  		real_fnmode = fnmode;
>  	}
> @@ -669,9 +692,9 @@ static int apple_input_configured(struct hid_device *hdev,
>  		asc->quirks &= ~APPLE_HAS_FN;
>  	}
>  
> -	if (strncmp(hdev->name, "Keychron", 8) == 0) {
> -		hid_info(hdev, "Keychron keyboard detected; function keys will default to fnmode=2 behavior\n");
> -		asc->quirks |= APPLE_IS_KEYCHRON;
> +	if (apple_is_non_apple_keyboard(hdev)) {
> +		hid_info(hdev, "Non-apple keyboard detected; function keys will default to fnmode=2 behavior\n");
> +		asc->quirks |= APPLE_IS_NON_APPLE;
>  	}
>  
>  	return 0;
> 
> base-commit: 700170bf6b4d773e328fa54ebb70ba444007c702
> -- 
> 2.36.1
>