linux-kernel - [PATCH v2] HID: input: Add support for Programmable Buttons

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Message-Id: <20210519174345.614467-1-linux@weissschuh.net>
Date:   Wed, 19 May 2021 19:43:45 +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 v2] HID: input: Add support for Programmable Buttons

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 -> v2: Only handle the 30 keys known

 drivers/hid/hid-debug.c | 11 +++++++++++
 drivers/hid/hid-input.c |  6 ++++++
 2 files changed, 17 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..32962772cb42 100644
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -632,6 +632,12 @@ 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 (code <= 29)
+					code += KEY_MACRO1;
+				else
+					code += BTN_TRIGGER_HAPPY - 30;
+				break;
 		default:
 			switch (field->physical) {
 			case HID_GD_MOUSE:

base-commit: efd8929b9eec1cde120abb36d76dd00ff6711023
-- 
2.31.1