linux-kernel - Re: [PATCH v3] HID: input: Add support for Programmable Buttons

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Date:   Tue, 8 Jun 2021 20:18:56 +0200
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     linux-input@...r.kernel.org, Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Hans de Goede <hdegoede@...hat.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] HID: input: Add support for Programmable Buttons

Hi everybody,

this is a ping requesting a review for my patch.
I hope it is not to early send a ping.

Link to patch in the archive:
https://lore.kernel.org/linux-input/20210520084805.685486-1-linux@weissschuh.net/

Regards,
Thomas


On Do, 2021-05-20T10:48+0200, Thomas Weißschuh wrote:
> Date: Thu, 20 May 2021 10:48:05 +0200
> From: Thomas Weißschuh <linux@...ssschuh.net>
> To: linux-input@...r.kernel.org, Jiri Kosina <jikos@...nel.org>, Benjamin
>  Tissoires <benjamin.tissoires@...hat.com>, Hans de Goede
>  <hdegoede@...hat.com>
> Cc: Thomas Weißschuh <linux@...ssschuh.net>, linux-kernel@...r.kernel.org
> Subject: [PATCH v3] HID: input: Add support for Programmable Buttons
> X-Mailer: git-send-email 2.31.1
> 
> Map them to KEY_MACRO# event codes.
> 
> These buttons are defined by HID as follows:
> "The user defines the function of these buttons to control software applications or GUI objects."
> 
> This matches the semantics of the KEY_MACRO# input event codes that Linux supports.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> ---
> 
> v1: https://lore.kernel.org/linux-input/20210519160349.609690-1-linux@weissschuh.net/
> 
> v1 -> v2: Only handle the 30 keys known
> 
> v2: https://lore.kernel.org/linux-input/20210519174345.614467-1-linux@weissschuh.net/
> 
> v2 -> v3:
>  * Use hex constants for consistency
>  * Validate that the button is part of a "Programmable Buttons" Named Array.
>    Otherwise the condition would also apply to "Function Buttons".
>  * Ignore non-"Programmable Buttons" buttons.
> 
>  drivers/hid/hid-debug.c | 11 +++++++++++
>  drivers/hid/hid-input.c | 22 ++++++++++++++++++++++
>  include/linux/hid.h     |  1 +
>  3 files changed, 34 insertions(+)
> 
> diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c
> index 59f8d716d78f..0e76d9b4530a 100644
> --- a/drivers/hid/hid-debug.c
> +++ b/drivers/hid/hid-debug.c
> @@ -122,6 +122,7 @@ static const struct hid_usage_entry hid_usage_table[] = {
>    {  9, 0, "Button" },
>    { 10, 0, "Ordinal" },
>    { 12, 0, "Consumer" },
> +      {0, 0x003, "ProgrammableButtons"},
>        {0, 0x238, "HorizontalWheel"},
>    { 13, 0, "Digitizers" },
>      {0, 0x01, "Digitizer"},
> @@ -939,6 +940,16 @@ static const char *keys[KEY_MAX + 1] = {
>  	[KEY_KBDINPUTASSIST_NEXTGROUP] = "KbdInputAssistNextGroup",
>  	[KEY_KBDINPUTASSIST_ACCEPT] = "KbdInputAssistAccept",
>  	[KEY_KBDINPUTASSIST_CANCEL] = "KbdInputAssistCancel",
> +	[KEY_MACRO1] = "Macro1", [KEY_MACRO2] = "Macro2", [KEY_MACRO3] = "Macro3",
> +	[KEY_MACRO4] = "Macro4", [KEY_MACRO5] = "Macro5", [KEY_MACRO6] = "Macro6",
> +	[KEY_MACRO7] = "Macro7", [KEY_MACRO8] = "Macro8", [KEY_MACRO9] = "Macro9",
> +	[KEY_MACRO10] = "Macro10", [KEY_MACRO11] = "Macro11", [KEY_MACRO12] = "Macro12",
> +	[KEY_MACRO13] = "Macro13", [KEY_MACRO14] = "Macro14", [KEY_MACRO15] = "Macro15",
> +	[KEY_MACRO16] = "Macro16", [KEY_MACRO17] = "Macro17", [KEY_MACRO18] = "Macro18",
> +	[KEY_MACRO19] = "Macro19", [KEY_MACRO20] = "Macro20", [KEY_MACRO21] = "Macro21",
> +	[KEY_MACRO22] = "Macro22", [KEY_MACRO23] = "Macro23", [KEY_MACRO24] = "Macro24",
> +	[KEY_MACRO25] = "Macro25", [KEY_MACRO26] = "Macro26", [KEY_MACRO27] = "Macro27",
> +	[KEY_MACRO28] = "Macro28", [KEY_MACRO29] = "Macro29", [KEY_MACRO30] = "Macro30",
>  };
>  
>  static const char *relatives[REL_MAX + 1] = {
> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
> index 18f5e28d475c..791a2baf9ccd 100644
> --- a/drivers/hid/hid-input.c
> +++ b/drivers/hid/hid-input.c
> @@ -567,6 +567,16 @@ static void hidinput_update_battery(struct hid_device *dev, int value)
>  }
>  #endif	/* CONFIG_HID_BATTERY_STRENGTH */
>  
> +static bool hidinput_field_in_collection(struct hid_device *device, struct hid_field *field,
> +					 unsigned int type, unsigned int usage)
> +{
> +	struct hid_collection *collection;
> +
> +	collection = &device->collection[field->usage->collection_index];
> +
> +	return collection->type == type && collection->usage == usage;
> +}
> +
>  static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_field *field,
>  				     struct hid_usage *usage)
>  {
> @@ -632,6 +642,18 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
>  				else
>  					code += BTN_TRIGGER_HAPPY - 0x10;
>  				break;
> +		case HID_CP_CONSUMER_CONTROL:
> +				if (hidinput_field_in_collection(device, field,
> +								 HID_COLLECTION_NAMED_ARRAY,
> +								 HID_CP_PROGRAMMABLEBUTTONS)) {
> +					if (code <= 0x1d)
> +						code += KEY_MACRO1;
> +					else
> +						code += BTN_TRIGGER_HAPPY - 0x1e;
> +				} else {
> +					goto ignore;
> +				}
> +				break;
>  		default:
>  			switch (field->physical) {
>  			case HID_GD_MOUSE:
> diff --git a/include/linux/hid.h b/include/linux/hid.h
> index 271021e20a3f..fb0e4dde6175 100644
> --- a/include/linux/hid.h
> +++ b/include/linux/hid.h
> @@ -102,6 +102,7 @@ struct hid_item {
>  #define HID_COLLECTION_PHYSICAL		0
>  #define HID_COLLECTION_APPLICATION	1
>  #define HID_COLLECTION_LOGICAL		2
> +#define HID_COLLECTION_NAMED_ARRAY	4
>  
>  /*
>   * HID report descriptor global item tags
> 
> base-commit: efd8929b9eec1cde120abb36d76dd00ff6711023
> -- 
> 2.31.1
>