HID: wacom: support named keys on older devices

Some Wacom devices have keys with predefined meanings. However, when
support was originally added for these devices, the codes for these
keys were not available yet. These keys were thus reported with
the numbered KEY_PROG* range.

Some missing key codes were added with commit 4eb220c ("HID:
wacom: generic: add 3 tablet touch keys") and we are now able to
report the proper key codes. We continue to report the original
KEY_PROG codes so as not to break any unknown applications that
may depend on them.

Also, to support the touch key, track its state in the pad report.

Signed-off-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Link: https://gitlab.freedesktop.org/libinput/libinput/merge_requests/155
Link: linuxwacom/xf86-input-wacom#46
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Reviewed-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

Author: skomra

drivers/hid/wacom_wac.c

@@ -483,6 +483,8 @@ static int wacom_intuos_pad(struct wacom_wac *wacom)
 	int ring1 = 0, ring2 = 0;
 	int strip1 = 0, strip2 = 0;
 	bool prox = false;
+	bool wrench = false, keyboard = false, mute_touch = false, menu = false,
+	     info = false;
 
 	/* pad packets. Works as a second tool and is always in prox */
 	if (!(data[0] == WACOM_REPORT_INTUOSPAD || data[0] == WACOM_REPORT_INTUOS5PAD ||
@@ -512,10 +514,32 @@ static int wacom_intuos_pad(struct wacom_wac *wacom)
 		keys = ((data[3] & 0x1C) ? 1<<2 : 0) |
 		       ((data[4] & 0xE0) ? 1<<1 : 0) |
 		       ((data[4] & 0x07) ? 1<<0 : 0);
+		keyboard = !!(data[4] & 0xE0);
+		info = !!(data[3] & 0x1C);
+
+		if (features->oPid) {
+			mute_touch = !!(data[4] & 0x07);
+			if (mute_touch)
+				wacom->shared->is_touch_on =
+					!wacom->shared->is_touch_on;
+		} else {
+			wrench = !!(data[4] & 0x07);
+		}
 	} else if (features->type == WACOM_27QHD) {
 		nkeys = 3;
 		keys = data[2] & 0x07;
 
+		wrench = !!(data[2] & 0x01);
+		keyboard = !!(data[2] & 0x02);
+
+		if (features->oPid) {
+			mute_touch = !!(data[2] & 0x04);
+			if (mute_touch)
+				wacom->shared->is_touch_on =
+					!wacom->shared->is_touch_on;
+		} else {
+			menu = !!(data[2] & 0x04);
+		}
 		input_report_abs(input, ABS_X, be16_to_cpup((__be16 *)&data[4]));
 		input_report_abs(input, ABS_Y, be16_to_cpup((__be16 *)&data[6]));
 		input_report_abs(input, ABS_Z, be16_to_cpup((__be16 *)&data[8]));
@@ -561,6 +585,9 @@ static int wacom_intuos_pad(struct wacom_wac *wacom)
 			if (features->type == WACOM_22HD) {
 				nkeys = 3;
 				keys = data[9] & 0x07;
+
+				info = !!(data[9] & 0x01);
+				wrench = !!(data[9] & 0x02);
 			}
 		} else {
 			buttons = ((data[6] & 0x10) << 5)  |
@@ -580,6 +607,18 @@ static int wacom_intuos_pad(struct wacom_wac *wacom)
 	for (i = 0; i < nkeys; i++)
 		input_report_key(input, KEY_PROG1 + i, keys & (1 << i));
 
+	input_report_key(input, KEY_BUTTONCONFIG, wrench);
+	input_report_key(input, KEY_ONSCREEN_KEYBOARD, keyboard);
+	input_report_key(input, KEY_CONTROLPANEL, menu);
+	input_report_key(input, KEY_INFO, info);
+
+	if (wacom->shared && wacom->shared->touch_input) {
+		input_report_switch(wacom->shared->touch_input,
+				    SW_MUTE_DEVICE,
+				    !wacom->shared->is_touch_on);
+		input_sync(wacom->shared->touch_input);
+	}
+
 	input_report_abs(input, ABS_RX, strip1);
 	input_report_abs(input, ABS_RY, strip2);
 
@@ -1480,6 +1519,12 @@ static int wacom_24hdt_irq(struct wacom_wac *wacom)
 	int byte_per_packet = WACOM_BYTES_PER_24HDT_PACKET;
 	int y_offset = 2;
 
+	if (wacom->shared->has_mute_touch_switch &&
+	    !wacom->shared->is_touch_on) {
+		if (!wacom->shared->touch_down)
+			return 0;
+	}
+
 	if (wacom->features.type == WACOM_27QHDT) {
 		current_num_contacts = data[63];
 		num_contacts_left = 10;
@@ -3812,6 +3857,14 @@ int wacom_setup_touch_input_capabilities(struct input_dev *input_dev,
 		/* fall through */
 
 	case WACOM_27QHDT:
+		if (wacom_wac->shared->touch->product == 0x32C ||
+		    wacom_wac->shared->touch->product == 0xF6) {
+			input_dev->evbit[0] |= BIT_MASK(EV_SW);
+			__set_bit(SW_MUTE_DEVICE, input_dev->swbit);
+			wacom_wac->shared->has_mute_touch_switch = true;
+		}
+		/* fall through */
+
 	case MTSCREEN:
 	case MTTPC:
 	case MTTPC_B:
@@ -4047,6 +4100,12 @@ int wacom_setup_pad_input_capabilities(struct input_dev *input_dev,
 		__set_bit(KEY_PROG2, input_dev->keybit);
 		__set_bit(KEY_PROG3, input_dev->keybit);
 
+		__set_bit(KEY_ONSCREEN_KEYBOARD, input_dev->keybit);
+		__set_bit(KEY_INFO, input_dev->keybit);
+
+		if (!features->oPid)
+			__set_bit(KEY_BUTTONCONFIG, input_dev->keybit);
+
 		input_set_abs_params(input_dev, ABS_WHEEL, 0, 71, 0, 0);
 		input_set_abs_params(input_dev, ABS_THROTTLE, 0, 71, 0, 0);
 		break;
@@ -4055,6 +4114,12 @@ int wacom_setup_pad_input_capabilities(struct input_dev *input_dev,
 		__set_bit(KEY_PROG1, input_dev->keybit);
 		__set_bit(KEY_PROG2, input_dev->keybit);
 		__set_bit(KEY_PROG3, input_dev->keybit);
+
+		__set_bit(KEY_ONSCREEN_KEYBOARD, input_dev->keybit);
+		__set_bit(KEY_BUTTONCONFIG, input_dev->keybit);
+
+		if (!features->oPid)
+			__set_bit(KEY_CONTROLPANEL, input_dev->keybit);
 		input_set_abs_params(input_dev, ABS_X, -2048, 2048, 0, 0);
 		input_abs_set_res(input_dev, ABS_X, 1024); /* points/g */
 		input_set_abs_params(input_dev, ABS_Y, -2048, 2048, 0, 0);
@@ -4068,6 +4133,9 @@ int wacom_setup_pad_input_capabilities(struct input_dev *input_dev,
 		__set_bit(KEY_PROG1, input_dev->keybit);
 		__set_bit(KEY_PROG2, input_dev->keybit);
 		__set_bit(KEY_PROG3, input_dev->keybit);
+
+		__set_bit(KEY_BUTTONCONFIG, input_dev->keybit);
+		__set_bit(KEY_INFO, input_dev->keybit);
 		/* fall through */
 
 	case WACOM_21UX2: