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-rw-r--r--drivers/hid/wacom_sys.c83
-rw-r--r--drivers/hid/wacom_wac.c2
2 files changed, 72 insertions, 13 deletions
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index edde8819e506..5e7a5648e708 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -527,36 +527,95 @@ struct wacom_hdev_data {
static LIST_HEAD(wacom_udev_list);
static DEFINE_MUTEX(wacom_udev_list_lock);
+static bool compare_device_paths(struct hid_device *hdev_a,
+ struct hid_device *hdev_b, char separator)
+{
+ int n1 = strrchr(hdev_a->phys, separator) - hdev_a->phys;
+ int n2 = strrchr(hdev_b->phys, separator) - hdev_b->phys;
+
+ if (n1 != n2 || n1 <= 0 || n2 <= 0)
+ return false;
+
+ return !strncmp(hdev_a->phys, hdev_b->phys, n1);
+}
+
static bool wacom_are_sibling(struct hid_device *hdev,
struct hid_device *sibling)
{
struct wacom *wacom = hid_get_drvdata(hdev);
struct wacom_features *features = &wacom->wacom_wac.features;
- int vid = features->oVid;
- int pid = features->oPid;
- int n1,n2;
+ struct wacom *sibling_wacom = hid_get_drvdata(sibling);
+ struct wacom_features *sibling_features = &sibling_wacom->wacom_wac.features;
+ __u32 oVid = features->oVid ? features->oVid : hdev->vendor;
+ __u32 oPid = features->oPid ? features->oPid : hdev->product;
- if (vid == 0 && pid == 0) {
- vid = hdev->vendor;
- pid = hdev->product;
+ /* The defined oVid/oPid must match that of the sibling */
+ if (features->oVid != HID_ANY_ID && sibling->vendor != oVid)
+ return false;
+ if (features->oPid != HID_ANY_ID && sibling->product != oPid)
+ return false;
+
+ /*
+ * Devices with the same VID/PID must share the same physical
+ * device path, while those with different VID/PID must share
+ * the same physical parent device path.
+ */
+ if (hdev->vendor == sibling->vendor && hdev->product == sibling->product) {
+ if (!compare_device_paths(hdev, sibling, '/'))
+ return false;
+ } else {
+ if (!compare_device_paths(hdev, sibling, '.'))
+ return false;
}
- if (vid != sibling->vendor || pid != sibling->product)
+ /* Skip the remaining heuristics unless you are a HID_GENERIC device */
+ if (features->type != HID_GENERIC)
+ return true;
+
+ /*
+ * Direct-input devices may not be siblings of indirect-input
+ * devices.
+ */
+ if ((features->device_type & WACOM_DEVICETYPE_DIRECT) &&
+ !(sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
return false;
- /* Compare the physical path. */
- n1 = strrchr(hdev->phys, '.') - hdev->phys;
- n2 = strrchr(sibling->phys, '.') - sibling->phys;
- if (n1 != n2 || n1 <= 0 || n2 <= 0)
+ /*
+ * Indirect-input devices may not be siblings of direct-input
+ * devices.
+ */
+ if (!(features->device_type & WACOM_DEVICETYPE_DIRECT) &&
+ (sibling_features->device_type & WACOM_DEVICETYPE_DIRECT))
+ return false;
+
+ /* Pen devices may only be siblings of touch devices */
+ if ((features->device_type & WACOM_DEVICETYPE_PEN) &&
+ !(sibling_features->device_type & WACOM_DEVICETYPE_TOUCH))
+ return false;
+
+ /* Touch devices may only be siblings of pen devices */
+ if ((features->device_type & WACOM_DEVICETYPE_TOUCH) &&
+ !(sibling_features->device_type & WACOM_DEVICETYPE_PEN))
return false;
- return !strncmp(hdev->phys, sibling->phys, n1);
+ /*
+ * No reason could be found for these two devices to NOT be
+ * siblings, so there's a good chance they ARE siblings
+ */
+ return true;
}
static struct wacom_hdev_data *wacom_get_hdev_data(struct hid_device *hdev)
{
struct wacom_hdev_data *data;
+ /* Try to find an already-probed interface from the same device */
+ list_for_each_entry(data, &wacom_udev_list, list) {
+ if (compare_device_paths(hdev, data->dev, '/'))
+ return data;
+ }
+
+ /* Fallback to finding devices that appear to be "siblings" */
list_for_each_entry(data, &wacom_udev_list, list) {
if (wacom_are_sibling(hdev, data->dev)) {
kref_get(&data->kref);
diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index a545c2451156..0c4eb31c1c71 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -3531,7 +3531,7 @@ static const struct wacom_features wacom_features_0x343 =
WACOM_DTU_OFFSET, WACOM_DTU_OFFSET };
static const struct wacom_features wacom_features_HID_ANY_ID =
- { "Wacom HID", .type = HID_GENERIC };
+ { "Wacom HID", .type = HID_GENERIC, .oVid = HID_ANY_ID, .oPid = HID_ANY_ID };
#define USB_DEVICE_WACOM(prod) \
HID_DEVICE(BUS_USB, HID_GROUP_WACOM, USB_VENDOR_ID_WACOM, prod),\