hw/usb/dev-wacom.c | 72 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 71 insertions(+), 1 deletion(-)
Linux need to fill up the HID descriptor in order to let the driver be
emulated. The descriptor was downloaded from [1]. The patch was tested
with evtest tool on top of qemu 5.2.0 with linux kernel 4.19.208.
[1] https://github.com/linuxwacom/wacom-hid-descriptors/tree/master/Wacom%20PenPartner
Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
---
hw/usb/dev-wacom.c | 72 +++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 71 insertions(+), 1 deletion(-)
diff --git a/hw/usb/dev-wacom.c b/hw/usb/dev-wacom.c
index ed687bc9f1eb..8323650c6a4d 100644
--- a/hw/usb/dev-wacom.c
+++ b/hw/usb/dev-wacom.c
@@ -69,6 +69,65 @@ static const USBDescStrings desc_strings = {
[STR_SERIALNUMBER] = "1",
};
+static const uint8_t qemu_wacom_hid_report_descriptor[] = {
+ 0x05, 0x01, /* Usage Page (Desktop) */
+ 0x09, 0x02, /* Usage (Mouse) */
+ 0xa1, 0x01, /* Collection (Application) */
+ 0x85, 0x01, /* Report ID (1) */
+ 0x09, 0x01, /* Usage (Pointer) */
+ 0xa1, 0x00, /* Collection (Physical) */
+ 0x05, 0x09, /* Usage Page (Button) */
+ 0x19, 0x01, /* Usage Minimum (01h) */
+ 0x29, 0x03, /* Usage Maximum (03h) */
+ 0x15, 0x00, /* Logical Minimum (0) */
+ 0x25, 0x01, /* Logical Maximum (1) */
+ 0x95, 0x03, /* Report Count (3) */
+ 0x75, 0x01, /* Report Size (1) */
+ 0x81, 0x02, /* Input (Data, Variable, Absolute) */
+ 0x95, 0x01, /* Report Count (1) */
+ 0x75, 0x05, /* Report Size (5) */
+ 0x81, 0x01, /* Input (Constant) */
+ 0x05, 0x01, /* Usage Page (Desktop) */
+ 0x09, 0x30, /* Usage (X) */
+ 0x09, 0x31, /* Usage (Y) */
+ 0x09, 0x38, /* Usage (Wheel) */
+ 0x15, 0x81, /* Logical Minimum (-127) */
+ 0x25, 0x7f, /* Logical Maximum (127) */
+ 0x75, 0x08, /* Report Size (8) */
+ 0x95, 0x03, /* Report Count (3) */
+ 0x81, 0x06, /* Input (Data, Variable, Relative) */
+ 0x95, 0x03, /* Report Count (3) */
+ 0x81, 0x01, /* Input (Constant) */
+ 0xc0, /* End Collection */
+ 0xc0, /* End Collection */
+ 0x05, 0x0d, /* Usage Page (Digitizer) */
+ 0x09, 0x01, /* Usage (Digitizer) */
+ 0xa1, 0x01, /* Collection (Application) */
+ 0x85, 0x02, /* Report ID (2) */
+ 0xa1, 0x00, /* Collection (Physical) */
+ 0x06, 0x00, 0xff,/* Usage Page (ff00h), vendor-defined */
+ 0x09, 0x01, /* Usage (01h) */
+ 0x15, 0x00, /* Logical Minimum (0) */
+ 0x26, 0xff, 0x00,/* Logical Maximum (255) */
+ 0x75, 0x08, /* Report Size (8) */
+ 0x95, 0x07, /* Report Count (7) */
+ 0x81, 0x02, /* Input (Data, Variable, Absolute) */
+ 0xc0, /* End Collection */
+ 0x09, 0x01, /* Usage (01h) */
+ 0x85, 0x63, /* Report ID (99) */
+ 0x95, 0x07, /* Report Count (7) */
+ 0x81, 0x02, /* Input (Data, Variable, Absolute) */
+ 0x09, 0x01, /* Usage (01h) */
+ 0x85, 0x02, /* Report ID (2) */
+ 0x95, 0x01, /* Report Count (1) */
+ 0xb1, 0x02, /* Feature (Variable) */
+ 0x09, 0x01, /* Usage (01h) */
+ 0x85, 0x03, /* Report ID (3) */
+ 0x95, 0x01, /* Report Count (1) */
+ 0xb1, 0x02, /* Feature (Variable) */
+ 0xc0 /* End Collection */
+};
+
static const USBDescIface desc_iface_wacom = {
.bInterfaceNumber = 0,
.bNumEndpoints = 1,
@@ -86,7 +145,7 @@ static const USBDescIface desc_iface_wacom = {
0x00, /* u8 country_code */
0x01, /* u8 num_descriptors */
USB_DT_REPORT, /* u8 type: Report */
- 0x6e, 0, /* u16 len */
+ sizeof(qemu_wacom_hid_report_descriptor), 0, /* u16 len */
},
},
},
@@ -266,6 +325,17 @@ static void usb_wacom_handle_control(USBDevice *dev, USBPacket *p,
}
switch (request) {
+ case InterfaceRequest | USB_REQ_GET_DESCRIPTOR:
+ switch (value >> 8) {
+ case 0x22:
+ memcpy(data, qemu_wacom_hid_report_descriptor,
+ sizeof(qemu_wacom_hid_report_descriptor));
+ p->actual_length = sizeof(qemu_wacom_hid_report_descriptor);
+ break;
+ default:
+ return;
+ }
+ break;
case WACOM_SET_REPORT:
if (s->mouse_grabbed) {
qemu_remove_mouse_event_handler(s->eh_entry);
--
2.32.0
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