Input: wacom - switch from an USB driver to a HID driver

All USB Wacom tablets are actually HID devices.
For historical reasons, they are handled as plain USB devices.
The current code makes more and more reference to the HID subsystem
like implementing its own HID report descriptor parser to handle new
devices.

From the user point of view, we can transparently switch from this state
to a driver handled in the HID subsystem and clean up a lot of USB specific
code in the wacom.ko driver.

The other benefit once the USB dependecies have been removed is that we can
use a tool like uhid to make regression tests and allow further cleanup or
new implementations without risking breaking current behaviors.

To match the current handling of devices in wacom_wac.c, we rely on the
hid_type set by usbhid. usbhid sets the hid_type to HID_TYPE_USBMOUSE when
it sees a USB boot mouse protocol declared and HID_TYPE_USBNONE when the
device is plain HID. There is thus a one to one matching between the list
of supported devices before and after the switch from USB to HID.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Reviewed-by: Jason Gerecke <killertofu@gmail.com>
Tested-by: Jason Gerecke <killertofu@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/hid/hid-core.c

@@ -787,6 +787,15 @@ static int hid_scan_report(struct hid_device *hid)
 		/* hid-rmi should take care of them, not hid-generic */
 		hid->group = HID_GROUP_RMI;
 
+	/*
+	 * Vendor specific handlings
+	 */
+	switch (hid->vendor) {
+	case USB_VENDOR_ID_WACOM:
+		hid->group = HID_GROUP_WACOM;
+		break;
+	}
+
 	vfree(parser);
 	return 0;
 }
@@ -2339,7 +2348,6 @@ static const struct hid_device_id hid_ignore_list[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_SKIP) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_CYCLOPS) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_VERNIER, USB_DEVICE_ID_VERNIER_LCSPEC) },
-	{ HID_USB_DEVICE(USB_VENDOR_ID_WACOM, HID_ANY_ID) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_WISEGROUP, USB_DEVICE_ID_4_PHIDGETSERVO_20) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_WISEGROUP, USB_DEVICE_ID_1_PHIDGETSERVO_20) },
 	{ HID_USB_DEVICE(USB_VENDOR_ID_WISEGROUP, USB_DEVICE_ID_8_8_4_IF_KIT) },

drivers/hid/hid-wacom.c

@@ -960,7 +960,7 @@ static const struct hid_device_id wacom_devices[] = {
 MODULE_DEVICE_TABLE(hid, wacom_devices);
 
 static struct hid_driver wacom_driver = {
-	.name = "wacom",
+	.name = "hid-wacom",
 	.id_table = wacom_devices,
 	.probe = wacom_probe,
 	.remove = wacom_remove,

drivers/input/tablet/wacom.h

@@ -106,14 +106,12 @@ MODULE_LICENSE(DRIVER_LICENSE);
 #define USB_VENDOR_ID_LENOVO	0x17ef
 
 struct wacom {
-	dma_addr_t data_dma;
 	struct usb_device *usbdev;
 	struct usb_interface *intf;
-	struct urb *irq;
 	struct wacom_wac wacom_wac;
+	struct hid_device *hdev;
 	struct mutex lock;
 	struct work_struct work;
-	bool open;
 	char phys[32];
 	struct wacom_led {
 		u8 select[2]; /* status led selector (0..3) */
@@ -130,7 +128,7 @@ static inline void wacom_schedule_work(struct wacom_wac *wacom_wac)
 	schedule_work(&wacom->work);
 }
 
-extern const struct usb_device_id wacom_ids[];
+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);

drivers/input/tablet/wacom_wac.c

@@ -2197,15 +2197,18 @@ static const struct wacom_features wacom_features_0x2A =
 static const struct wacom_features wacom_features_0x314 =
 	{ "Wacom Intuos Pro S", WACOM_PKGLEN_INTUOS,  31496, 19685, 2047,
 	  63, INTUOSPS, WACOM_INTUOS3_RES, WACOM_INTUOS3_RES,
-	  .touch_max = 16 };
+	  .touch_max = 16,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBNONE };
 static const struct wacom_features wacom_features_0x315 =
 	{ "Wacom Intuos Pro M", WACOM_PKGLEN_INTUOS,  44704, 27940, 2047,
 	  63, INTUOSPM, WACOM_INTUOS3_RES, WACOM_INTUOS3_RES,
-	  .touch_max = 16 };
+	  .touch_max = 16,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBNONE };
 static const struct wacom_features wacom_features_0x317 =
 	{ "Wacom Intuos Pro L", WACOM_PKGLEN_INTUOS,  65024, 40640, 2047,
 	  63, INTUOSPL, WACOM_INTUOS3_RES, WACOM_INTUOS3_RES,
-	  .touch_max = 16 };
+	  .touch_max = 16,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBNONE };
 static const struct wacom_features wacom_features_0xF4 =
 	{ "Wacom Cintiq 24HD",       WACOM_PKGLEN_INTUOS,   104280, 65400, 2047,
 	  63, WACOM_24HD, WACOM_INTUOS3_RES, WACOM_INTUOS3_RES, 200, 200 };
@@ -2215,7 +2218,8 @@ static const struct wacom_features wacom_features_0xF8 =
 	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0xf6 };
 static const struct wacom_features wacom_features_0xF6 =
 	{ "Wacom Cintiq 24HD touch", .type = WACOM_24HDT, /* Touch */
-	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0xf8, .touch_max = 10 };
+	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0xf8, .touch_max = 10,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBNONE };
 static const struct wacom_features wacom_features_0x3F =
 	{ "Wacom Cintiq 21UX",    WACOM_PKGLEN_INTUOS,    87200, 65600, 1023,
 	  63, CINTIQ, WACOM_INTUOS3_RES, WACOM_INTUOS3_RES };
@@ -2233,7 +2237,8 @@ static const struct wacom_features wacom_features_0xC7 =
 	  0, PL, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
 static const struct wacom_features wacom_features_0xCE =
 	{ "Wacom DTU2231",        WACOM_PKGLEN_GRAPHIRE,  47864, 27011,  511,
-	  0, DTU, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
+	  0, DTU, WACOM_INTUOS_RES, WACOM_INTUOS_RES,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBMOUSE };
 static const struct wacom_features wacom_features_0xF0 =
 	{ "Wacom DTU1631",        WACOM_PKGLEN_GRAPHIRE,  34623, 19553,  511,
 	  0, DTU, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
@@ -2249,7 +2254,8 @@ static const struct wacom_features wacom_features_0x59 = /* Pen */
 	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0x5D };
 static const struct wacom_features wacom_features_0x5D = /* Touch */
 	{ "Wacom DTH2242",       .type = WACOM_24HDT,
-	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0x59, .touch_max = 10 };
+	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0x59, .touch_max = 10,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBNONE };
 static const struct wacom_features wacom_features_0xCC =
 	{ "Wacom Cintiq 21UX2",   WACOM_PKGLEN_INTUOS,    87000, 65400, 2047,
 	  63, WACOM_21UX2, WACOM_INTUOS3_RES, WACOM_INTUOS3_RES, 200, 200 };
@@ -2262,7 +2268,8 @@ static const struct wacom_features wacom_features_0x5B =
 	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0x5e };
 static const struct wacom_features wacom_features_0x5E =
 	{ "Wacom Cintiq 22HDT", .type = WACOM_24HDT,
-	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0x5b, .touch_max = 10 };
+	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0x5b, .touch_max = 10,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBNONE };
 static const struct wacom_features wacom_features_0x90 =
 	{ "Wacom ISDv4 90",       WACOM_PKGLEN_GRAPHIRE,  26202, 16325,  255,
 	  0, TABLETPC, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
@@ -2400,14 +2407,17 @@ static const struct wacom_features wacom_features_0x301 =
 static const struct wacom_features wacom_features_0x302 =
 	{ "Wacom Intuos PT S",     WACOM_PKGLEN_BBPEN,    15200,  9500, 1023,
 	  31, INTUOSHT, WACOM_INTUOS_RES, WACOM_INTUOS_RES,
-	  .touch_max = 16 };
+	  .touch_max = 16,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBNONE };
 static const struct wacom_features wacom_features_0x303 =
 	{ "Wacom Intuos PT M",     WACOM_PKGLEN_BBPEN,    21600, 13500, 1023,
 	  31, INTUOSHT, WACOM_INTUOS_RES, WACOM_INTUOS_RES,
-	  .touch_max = 16 };
+	  .touch_max = 16,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBNONE };
 static const struct wacom_features wacom_features_0x30E =
 	{ "Wacom Intuos S",        WACOM_PKGLEN_BBPEN,    15200,  9500, 1023,
-	  31, INTUOSHT, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
+	  31, INTUOSHT, WACOM_INTUOS_RES, WACOM_INTUOS_RES,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBNONE };
 static const struct wacom_features wacom_features_0x6004 =
 	{ "ISD-V4",               WACOM_PKGLEN_GRAPHIRE,  12800,  8000,  255,
 	  0, TABLETPC, WACOM_INTUOS_RES, WACOM_INTUOS_RES };
@@ -2417,22 +2427,18 @@ static const struct wacom_features wacom_features_0x0307 =
 	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0x309 };
 static const struct wacom_features wacom_features_0x0309 =
 	{ "Wacom ISDv5 309", .type = WACOM_24HDT, /* Touch */
-	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0x0307, .touch_max = 10 };
-
-#define USB_DEVICE_WACOM(prod)					\
-	USB_DEVICE(USB_VENDOR_ID_WACOM, prod),			\
-	.driver_info = (kernel_ulong_t)&wacom_features_##prod
+	  .oVid = USB_VENDOR_ID_WACOM, .oPid = 0x0307, .touch_max = 10,
+	  .check_for_hid_type = true, .hid_type = HID_TYPE_USBNONE };
 
-#define USB_DEVICE_DETAILED(prod, class, sub, proto)			\
-	USB_DEVICE_AND_INTERFACE_INFO(USB_VENDOR_ID_WACOM, prod, class,	\
-				      sub, proto),			\
-	.driver_info = (kernel_ulong_t)&wacom_features_##prod
+#define USB_DEVICE_WACOM(prod)						\
+	HID_DEVICE(BUS_USB, HID_GROUP_WACOM, USB_VENDOR_ID_WACOM, prod),\
+	.driver_data = (kernel_ulong_t)&wacom_features_##prod
 
 #define USB_DEVICE_LENOVO(prod)					\
-	USB_DEVICE(USB_VENDOR_ID_LENOVO, prod),			\
-	.driver_info = (kernel_ulong_t)&wacom_features_##prod
+	HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, prod),			\
+	.driver_data = (kernel_ulong_t)&wacom_features_##prod
 
-const struct usb_device_id wacom_ids[] = {
+const struct hid_device_id wacom_ids[] = {
 	{ USB_DEVICE_WACOM(0x00) },
 	{ USB_DEVICE_WACOM(0x10) },
 	{ USB_DEVICE_WACOM(0x11) },
@@ -2478,9 +2484,9 @@ const struct usb_device_id wacom_ids[] = {
 	{ USB_DEVICE_WACOM(0x45) },
 	{ USB_DEVICE_WACOM(0x57) },
 	{ USB_DEVICE_WACOM(0x59) },
-	{ USB_DEVICE_DETAILED(0x5D, USB_CLASS_HID, 0, 0) },
+	{ USB_DEVICE_WACOM(0x5D) },
 	{ USB_DEVICE_WACOM(0x5B) },
-	{ USB_DEVICE_DETAILED(0x5E, USB_CLASS_HID, 0, 0) },
+	{ USB_DEVICE_WACOM(0x5E) },
 	{ USB_DEVICE_WACOM(0xB0) },
 	{ USB_DEVICE_WACOM(0xB1) },
 	{ USB_DEVICE_WACOM(0xB2) },
@@ -2502,13 +2508,7 @@ const struct usb_device_id wacom_ids[] = {
 	{ USB_DEVICE_WACOM(0xC5) },
 	{ USB_DEVICE_WACOM(0xC6) },
 	{ USB_DEVICE_WACOM(0xC7) },
-	/*
-	 * DTU-2231 has two interfaces on the same configuration,
-	 * only one is used.
-	 */
-	{ USB_DEVICE_DETAILED(0xCE, USB_CLASS_HID,
-			      USB_INTERFACE_SUBCLASS_BOOT,
-			      USB_INTERFACE_PROTOCOL_MOUSE) },
+	{ USB_DEVICE_WACOM(0xCE) },
 	{ USB_DEVICE_WACOM(0x84) },
 	{ USB_DEVICE_WACOM(0xD0) },
 	{ USB_DEVICE_WACOM(0xD1) },
@@ -2546,13 +2546,13 @@ const struct usb_device_id wacom_ids[] = {
 	{ USB_DEVICE_WACOM(0x116) },
 	{ USB_DEVICE_WACOM(0x300) },
 	{ USB_DEVICE_WACOM(0x301) },
-	{ USB_DEVICE_DETAILED(0x302, USB_CLASS_HID, 0, 0) },
-	{ USB_DEVICE_DETAILED(0x303, USB_CLASS_HID, 0, 0) },
-	{ USB_DEVICE_DETAILED(0x30E, USB_CLASS_HID, 0, 0) },
+	{ USB_DEVICE_WACOM(0x302) },
+	{ USB_DEVICE_WACOM(0x303) },
+	{ USB_DEVICE_WACOM(0x30E) },
 	{ USB_DEVICE_WACOM(0x304) },
-	{ USB_DEVICE_DETAILED(0x314, USB_CLASS_HID, 0, 0) },
-	{ USB_DEVICE_DETAILED(0x315, USB_CLASS_HID, 0, 0) },
-	{ USB_DEVICE_DETAILED(0x317, USB_CLASS_HID, 0, 0) },
+	{ USB_DEVICE_WACOM(0x314) },
+	{ USB_DEVICE_WACOM(0x315) },
+	{ USB_DEVICE_WACOM(0x317) },
 	{ USB_DEVICE_WACOM(0x4001) },
 	{ USB_DEVICE_WACOM(0x4004) },
 	{ USB_DEVICE_WACOM(0x5000) },
@@ -2560,12 +2560,12 @@ const struct usb_device_id wacom_ids[] = {
 	{ USB_DEVICE_WACOM(0x47) },
 	{ USB_DEVICE_WACOM(0xF4) },
 	{ USB_DEVICE_WACOM(0xF8) },
-	{ USB_DEVICE_DETAILED(0xF6, USB_CLASS_HID, 0, 0) },
+	{ USB_DEVICE_WACOM(0xF6) },
 	{ USB_DEVICE_WACOM(0xFA) },
 	{ USB_DEVICE_WACOM(0xFB) },
 	{ USB_DEVICE_WACOM(0x0307) },
-	{ USB_DEVICE_DETAILED(0x0309, USB_CLASS_HID, 0, 0) },
+	{ USB_DEVICE_WACOM(0x0309) },
 	{ USB_DEVICE_LENOVO(0x6004) },
 	{ }
 };
-MODULE_DEVICE_TABLE(usb, wacom_ids);
+MODULE_DEVICE_TABLE(hid, wacom_ids);

drivers/input/tablet/wacom_wac.h

@@ -137,6 +137,8 @@ struct wacom_features {
 	unsigned touch_max;
 	int oVid;
 	int oPid;
+	bool check_for_hid_type;
+	int hid_type;
 };
 
 struct wacom_shared {
@@ -151,7 +153,7 @@ struct wacom_shared {
 struct wacom_wac {
 	char name[WACOM_NAME_MAX];
 	char pad_name[WACOM_NAME_MAX];
-	unsigned char *data;
+	unsigned char data[WACOM_PKGLEN_MAX];
 	int tool[2];
 	int id[2];
 	__u32 serial[2];

include/linux/hid.h

@@ -310,6 +310,11 @@ struct hid_item {
  */
 #define HID_GROUP_RMI				0x0100
 
+/*
+ * Vendor specific HID device groups
+ */
+#define HID_GROUP_WACOM				0x0101
+
 /*
  * This is the global environment of the parser. This information is
  * persistent for main-items. The global environment can be saved and