HID: wacom: Introduce a new WACOM_DEVICETYPE_PAD device_type

Historically, both the touch and pad tools would have shared the
'BTN_TOOL_FINGER' type. Any time you needed to distinguish the two, you
had to use some other bit of knowledge (e.g. that the pad was on the same
interface as the pen, and thus 'touch_max' would be zero).

To make these checks more readable, we introduce WACOM_DEVICETYPE_PAD.
Although we still have to rely on other bits of knowledge to set this
bit on the right interface (since it cannot be detected from the HID
descriptor), it can be done just once inside 'wacom_setup_device_quirks'.

This patch introduces no functional changes.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 37 insertions, 34 deletions

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 5e7710d6b048..564a06d5d727 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -2167,6 +2167,15 @@ void wacom_setup_device_quirks(struct wacom *wacom)
 {
 	struct wacom_features *features = &wacom->wacom_wac.features;
 
+	/* The pen and pad share the same interface on most devices */
+	if (features->type == GRAPHIRE_BT || features->type == WACOM_G4 ||
+	    features->type == DTUS || features->type == WACOM_MO ||
+	    (features->type >= INTUOS3S && features->type <= WACOM_13HD && 
+	     features->type != INTUOSHT)) {
+		if (features->device_type & WACOM_DEVICETYPE_PEN)
+			features->device_type |= WACOM_DEVICETYPE_PAD;
+	}
+
 	/* touch device found but size is not defined. use default */
 	if (features->device_type & WACOM_DEVICETYPE_TOUCH && !features->x_max) {
 		features->x_max = 1023;
@@ -2182,7 +2191,10 @@ void wacom_setup_device_quirks(struct wacom *wacom)
 	if ((features->type >= INTUOS5S && features->type <= INTUOSHT) ||
 		(features->type == BAMBOO_PT)) {
 		if (features->pktlen == WACOM_PKGLEN_BBTOUCH3) {
-			features->device_type |= WACOM_DEVICETYPE_TOUCH;
+			if (features->touch_max)
+				features->device_type |= WACOM_DEVICETYPE_TOUCH;
+			if (features->type == BAMBOO_PT || features->type == INTUOSHT)
+				features->device_type |= WACOM_DEVICETYPE_PAD;
 
 			features->x_max = 4096;
 			features->y_max = 4096;
@@ -2241,7 +2253,7 @@ static void wacom_abs_set_axis(struct input_dev *input_dev,
 		/* penabled devices have fixed resolution for each model */
 		input_abs_set_res(input_dev, ABS_X, features->x_resolution);
 		input_abs_set_res(input_dev, ABS_Y, features->y_resolution);
-	} else {
+	} else if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
 		if (features->touch_max == 1) {
 			input_set_abs_params(input_dev, ABS_X, 0,
 				features->x_max, features->x_fuzz, 0);
@@ -2423,8 +2435,7 @@ int wacom_setup_pentouch_input_capabilities(struct input_dev *input_dev,
 		break;
 
 	case INTUOSHT:
-		if (features->touch_max &&
-		    features->device_type & WACOM_DEVICETYPE_TOUCH) {
+		if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
 			input_dev->evbit[0] |= BIT_MASK(EV_SW);
 			__set_bit(SW_MUTE_DEVICE, input_dev->swbit);
 		}
@@ -2434,27 +2445,26 @@ int wacom_setup_pentouch_input_capabilities(struct input_dev *input_dev,
 		__clear_bit(ABS_MISC, input_dev->absbit);
 
 		if (features->device_type & WACOM_DEVICETYPE_TOUCH) {
-
-			if (features->touch_max) {
-				if (features->pktlen == WACOM_PKGLEN_BBTOUCH3) {
-					input_set_abs_params(input_dev,
-						     ABS_MT_TOUCH_MAJOR,
-						     0, features->x_max, 0, 0);
-					input_set_abs_params(input_dev,
-						     ABS_MT_TOUCH_MINOR,
-						     0, features->y_max, 0, 0);
-				}
-				input_mt_init_slots(input_dev, features->touch_max, INPUT_MT_POINTER);
-			} else {
-				/* buttons/keys only interface */
-				__clear_bit(ABS_X, input_dev->absbit);
-				__clear_bit(ABS_Y, input_dev->absbit);
-				__clear_bit(BTN_TOUCH, input_dev->keybit);
-
-				/* PAD is setup by wacom_setup_pad_input_capabilities later */
-				return 1;
+			if (features->pktlen == WACOM_PKGLEN_BBTOUCH3) {
+				input_set_abs_params(input_dev,
+					     ABS_MT_TOUCH_MAJOR,
+					     0, features->x_max, 0, 0);
+				input_set_abs_params(input_dev,
+					     ABS_MT_TOUCH_MINOR,
+					     0, features->y_max, 0, 0);
 			}
-		} else if (features->device_type & WACOM_DEVICETYPE_PEN) {
+			input_mt_init_slots(input_dev, features->touch_max, INPUT_MT_POINTER);
+		}
+		if (features->device_type & WACOM_DEVICETYPE_PAD) {
+			/* buttons/keys only interface */
+			__clear_bit(ABS_X, input_dev->absbit);
+			__clear_bit(ABS_Y, input_dev->absbit);
+			__clear_bit(BTN_TOUCH, input_dev->keybit);
+
+			/* PAD is setup by wacom_setup_pad_input_capabilities later */
+			return 1;
+		}
+		if (features->device_type & WACOM_DEVICETYPE_PEN) {
 			__set_bit(INPUT_PROP_POINTER, input_dev->propbit);
 			__set_bit(BTN_TOOL_RUBBER, input_dev->keybit);
 			__set_bit(BTN_TOOL_PEN, input_dev->keybit);
@@ -2482,6 +2492,9 @@ int wacom_setup_pad_input_capabilities(struct input_dev *input_dev,
 	struct wacom_features *features = &wacom_wac->features;
 	int i;
 
+	if (!(features->device_type & WACOM_DEVICETYPE_PAD))
+		return -ENODEV;
+
 	input_dev->evbit[0] |= BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
 
 	/* kept for making legacy xf86-input-wacom working with the wheels */
@@ -2618,10 +2631,6 @@ int wacom_setup_pad_input_capabilities(struct input_dev *input_dev,
 
 	case INTUOS5S:
 	case INTUOSPS:
-		/* touch interface does not have the pad device */
-		if (!(features->device_type & WACOM_DEVICETYPE_PEN))
-			return -ENODEV;
-
 		for (i = 0; i < 7; i++)
 			__set_bit(BTN_0 + i, input_dev->keybit);
 
@@ -2663,12 +2672,6 @@ int wacom_setup_pad_input_capabilities(struct input_dev *input_dev,
 
 	case INTUOSHT:
 	case BAMBOO_PT:
-		/* pad device is on the touch interface */
-		if (!(features->device_type & WACOM_DEVICETYPE_TOUCH) ||
-		    /* Bamboo Pen only tablet does not have pad */
-		    ((features->type == BAMBOO_PT) && !features->touch_max))
-			return -ENODEV;
-
 		__clear_bit(ABS_MISC, input_dev->absbit);
 
 		__set_bit(BTN_LEFT, input_dev->keybit);