HID: wacom - Bamboo pen-only tablet does not support PAD

Bamboo models do not support HID_DG_CONTACTMAX. Plus, Bamboo pen-only
has touch descriptor. This leads to some complications in the code.

This patch also fixes duplicated PAD interfeaces for Intuos Pen
models.

Signed-off-by: Ping Cheng <pingc@wacom.com>
Reviewed-by:  Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

3 files changed, 23 insertions, 13 deletions

diff --git a/drivers/hid/wacom.h b/drivers/hid/wacom.h
index 0cc53440543a..7db432809e9e 100644
--- a/drivers/hid/wacom.h
+++ b/drivers/hid/wacom.h
@@ -140,7 +140,7 @@ extern const struct hid_device_id wacom_ids[];
 
 void wacom_wac_irq(struct wacom_wac *wacom_wac, size_t len);
 void wacom_setup_device_quirks(struct wacom_features *features);
-int wacom_setup_input_capabilities(struct input_dev *input_dev,
+int wacom_setup_pentouch_input_capabilities(struct input_dev *input_dev,
                                    struct wacom_wac *wacom_wac);
 int wacom_setup_pad_input_capabilities(struct input_dev *input_dev,
                                        struct wacom_wac *wacom_wac);
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 8593047bb726..68b6cd66f9c3 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -192,9 +192,15 @@ static void wacom_usage_mapping(struct hid_device *hdev,
         if (!pen && !finger)
                 return;
 
-        if (finger && !features->touch_max)
-                /* touch device at least supports one touch point */
-                features->touch_max = 1;
+        /*
+         * Bamboo models do not support HID_DG_CONTACTMAX.
+         * And, Bamboo Pen only descriptor contains touch.
+         */
+        if (features->type != BAMBOO_PT) {
+                /* ISDv4 touch devices at least supports one touch point */
+                if (finger && !features->touch_max)
+                        features->touch_max = 1;
+        }
 
         switch (usage->hid) {
         case HID_GD_X:
@@ -1151,13 +1157,12 @@ static int wacom_register_inputs(struct wacom *wacom)
         if (!input_dev || !pad_input_dev)
                 return -EINVAL;
 
-        error = wacom_setup_input_capabilities(input_dev, wacom_wac);
-        if (error)
-                return error;
-
-        error = input_register_device(input_dev);
-        if (error)
-                return error;
+        error = wacom_setup_pentouch_input_capabilities(input_dev, wacom_wac);
+        if (!error) {
+                error = input_register_device(input_dev);
+                if (error)
+                        return error;
+        }
 
         error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
         if (error) {
diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 51c7353e01a5..caf035f662b9 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -2032,7 +2032,7 @@ static void wacom_abs_set_axis(struct input_dev *input_dev,
         }
 }
 
-int wacom_setup_input_capabilities(struct input_dev *input_dev,
+int wacom_setup_pentouch_input_capabilities(struct input_dev *input_dev,
                                    struct wacom_wac *wacom_wac)
 {
         struct wacom_features *features = &wacom_wac->features;
@@ -2246,6 +2246,9 @@ int wacom_setup_input_capabilities(struct input_dev *input_dev,
                                 __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;
                         }
                 } else if (features->device_type == BTN_TOOL_PEN) {
                         __set_bit(INPUT_PROP_POINTER, input_dev->propbit);
@@ -2444,7 +2447,9 @@ 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 != BTN_TOOL_FINGER)
+                if ((features->device_type != BTN_TOOL_FINGER) ||
+                    /* Bamboo Pen only tablet does not have pad */
+                    ((features->type == BAMBOO_PT) && !features->touch_max))
                         return -ENODEV;
 
                 __clear_bit(ABS_MISC, input_dev->absbit);