HID: add support for Microsoft Natural Ergonomic Keyboard 4000

This keyboard emits a few usages that are not handled properly by
hid-input.

The usages from MSVENDOR page are colliding with Chicony Tactical
Pad device, so we have to distinguish in runtime. Ugly ...

Also, the buttons 1-5 have to be handled in a non-standard way,
as they are emitted by the keyboard in a bitfield-like fashion, but
the field is not presented as bit-field by the keyboard. The keys can't
be pressed simultaneously, so the handling we have is correct.

This patch also extends hid_keyboard[] with KPLeftParenthesis and
KPRightParenthesis as defined by Keyboard page in HUT 1.12. The
corresponding usages are also emitted by this keyboard.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-debug.c

@@ -697,7 +697,7 @@ static char *keys[KEY_MAX + 1] = {
 	[KEY_DEL_LINE] = "DeleteLine",
 	[KEY_SEND] = "Send",			[KEY_REPLY] = "Reply",
 	[KEY_FORWARDMAIL] = "ForwardMail",	[KEY_SAVE] = "Save",
-	[KEY_DOCUMENTS] = "Documents",
+	[KEY_DOCUMENTS] = "Documents",		[KEY_SPELLCHECK] = "SpellCheck",
 	[KEY_FN] = "Fn",			[KEY_FN_ESC] = "Fn+ESC",
 	[KEY_FN_1] = "Fn+1",			[KEY_FN_2] = "Fn+2",
 	[KEY_FN_B] = "Fn+B",			[KEY_FN_D] = "Fn+D",

drivers/hid/hid-input.c

@@ -53,7 +53,7 @@ static const unsigned char hid_keyboard[256] = {
 	115,114,unk,unk,unk,121,unk, 89, 93,124, 92, 94, 95,unk,unk,unk,
 	122,123, 90, 91, 85,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
 	unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
-	unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
+	unk,unk,unk,unk,unk,unk,179,180,unk,unk,unk,unk,unk,unk,unk,unk,
 	unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
 	unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,unk,
 	 29, 42, 56,125, 97, 54,100,126,164,166,165,163,161,115,114,113,
@@ -86,6 +86,10 @@ static const struct {
 #define map_abs_clear(c)	do { map_abs(c); clear_bit(c, bit); } while (0)
 #define map_key_clear(c)	do { map_key(c); clear_bit(c, bit); } while (0)
 
+/* hardware needing special handling due to colliding MSVENDOR page usages */
+#define IS_CHICONY_TACTICAL_PAD(x) (x->vendor == 0x04f2 && device->product == 0x0418)
+#define IS_MS_NEK4K(x) (x->vendor == 0x045e && x->product == 0x00db)
+
 #ifdef CONFIG_USB_HIDINPUT_POWERBOOK
 
 struct hidinput_key_translation {
@@ -614,6 +618,7 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 				case 0x19e: map_key_clear(KEY_COFFEE);		break;
 				case 0x1a6: map_key_clear(KEY_HELP);		break;
 				case 0x1a7: map_key_clear(KEY_DOCUMENTS);	break;
+				case 0x1ab: map_key_clear(KEY_SPELLCHECK);	break;
 				case 0x1bc: map_key_clear(KEY_MESSENGER);	break;
 				case 0x1bd: map_key_clear(KEY_INFO);		break;
 				case 0x201: map_key_clear(KEY_NEW);		break;
@@ -720,8 +725,15 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 
 		case HID_UP_MSVENDOR:
 
-			/* special case - Chicony Chicony KU-0418 tactical pad */
-			if (device->vendor == 0x04f2 && device->product == 0x0418) {
+			/* Unfortunately, there are multiple devices which
+			 * emit usages from MSVENDOR page that require different
+			 * handling. If this list grows too much in the future,
+			 * more general handling will have to be introduced here
+			 * (i.e. another blacklist).
+			 */
+
+			/* Chicony Chicony KU-0418 tactical pad */
+			if (IS_CHICONY_TACTICAL_PAD(device)) {
 				set_bit(EV_REP, input->evbit);
 				switch(usage->hid & HID_USAGE) {
 					case 0xff01: map_key_clear(BTN_1);		break;
@@ -737,6 +749,20 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
 					case 0xff0b: map_key_clear(BTN_B);		break;
 					default:    goto ignore;
 				}
+
+			/* Microsoft Natural Ergonomic Keyboard 4000 */
+			} else if (IS_MS_NEK4K(device)) {
+				switch(usage->hid & HID_USAGE) {
+					case 0xff05:
+						set_bit(EV_REP, input->evbit);
+						map_key_clear(BTN_0);
+						set_bit(BTN_1, input->keybit);
+						set_bit(BTN_2, input->keybit);
+						set_bit(BTN_3, input->keybit);
+						set_bit(BTN_4, input->keybit);
+						set_bit(BTN_5, input->keybit);
+					default:	goto ignore;
+				}
 			} else {
 				goto ignore;
 			}
@@ -991,6 +1017,26 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
 		return;
 	}
 
+	/* Handling MS NEK4K special buttons */
+	if (IS_MS_NEK4K(hid) && usage->hid == (HID_UP_MSVENDOR | 0xff05)) {
+		int key = 0;
+		static int last_key = 0;
+		switch (value) {
+			case 0x01: key = BTN_1; break;
+			case 0x02: key = BTN_2; break;
+			case 0x04: key = BTN_3; break;
+			case 0x08: key = BTN_4; break;
+			case 0x10: key = BTN_5; break;
+			default: break;
+		}
+		if (key) {
+			input_event(input, usage->type, key, 1);
+			last_key = key;
+		} else {
+			input_event(input, usage->type, last_key, 0);
+		}
+	}
+
 	input_event(input, usage->type, usage->code, value);
 
 	if ((field->flags & HID_MAIN_ITEM_RELATIVE) && (usage->type == EV_KEY))