HID: uclogic: Switch to reporting abstract button events

Based on a patch from: Nikolai Kondrashov <Nikolai.Kondrashov@redhat.com>

Enable abstract keyboard mode for Huion tablets, which makes them report
frame buttons using the pen interface and report ID. Divert these
reports to a virtual report ID describing them.

This makes the tablet compatible with xf86-input-wacom and libinput,
but stops the frame buttons from reporting keyboard events.

Signed-off-by: Nikolai Kondrashov <spbnick@gmail.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-uclogic.c b/drivers/hid/hid-uclogic.c
index 790528e..73c040d 100644 (file)
--- a/drivers/hid/hid-uclogic.c
+++ b/drivers/hid/hid-uclogic.c
@@ -586,6 +586,27 @@ static const __u8 uclogic_tablet_rdesc_template[] = {
        0xC0                    /*  End Collection                          */
 };
 
+/* Fixed virtual pad report descriptor */
+static const __u8 uclogic_buttonpad_rdesc[] = {
+       0x05, 0x01,             /*  Usage Page (Desktop),                   */
+       0x09, 0x07,             /*  Usage (Keypad),                         */
+       0xA1, 0x01,             /*  Collection (Application),               */
+       0x85, 0xF7,             /*      Report ID (247),                    */
+       0x05, 0x0D,             /*      Usage Page (Digitizers),            */
+       0x09, 0x39,             /*      Usage (Tablet Function Keys),       */
+       0xA0,                   /*      Collection (Physical),              */
+       0x05, 0x09,             /*          Usage Page (Button),            */
+       0x75, 0x01,             /*          Report Size (1),                */
+       0x95, 0x18,             /*          Report Count (24),              */
+       0x81, 0x03,             /*          Input (Constant, Variable),     */
+       0x19, 0x01,             /*          Usage Minimum (01h),            */
+       0x29, 0x08,             /*          Usage Maximum (08h),            */
+       0x95, 0x08,             /*          Report Count (8),               */
+       0x81, 0x02,             /*          Input (Variable),               */
+       0xC0,                   /*      End Collection                      */
+       0xC0                    /*  End Collection                          */
+};
+
 /* Parameter indices */
 enum uclogic_prm {
        UCLOGIC_PRM_X_LM        = 1,
@@ -601,6 +622,7 @@ struct uclogic_drvdata {
        unsigned int rsize;
        bool invert_pen_inrange;
        bool ignore_pen_usage;
+       bool has_virtual_pad_interface;
 };
 
 static __u8 *uclogic_report_fixup(struct hid_device *hdev, __u8 *rdesc,
@@ -847,6 +869,69 @@ cleanup:
        return rc;
 }
 
+/**
+ * Enable actual button mode.
+ *
+ * @hdev:      HID device
+ */
+static int uclogic_button_enable(struct hid_device *hdev)
+{
+       int rc;
+       struct usb_device *usb_dev = hid_to_usb_dev(hdev);
+       struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
+       char *str_buf;
+       size_t str_len = 16;
+       unsigned char *rdesc;
+       size_t rdesc_len;
+
+       str_buf = kzalloc(str_len, GFP_KERNEL);
+       if (str_buf == NULL) {
+               rc = -ENOMEM;
+               goto cleanup;
+       }
+
+       /* Enable abstract keyboard mode */
+       rc = usb_string(usb_dev, 0x7b, str_buf, str_len);
+       if (rc == -EPIPE) {
+               hid_info(hdev, "button mode setting not found\n");
+               rc = 0;
+               goto cleanup;
+       } else if (rc < 0) {
+               hid_err(hdev, "failed to enable abstract keyboard\n");
+               goto cleanup;
+       } else if (strncmp(str_buf, "HK On", rc)) {
+               hid_info(hdev, "invalid answer when requesting buttons: '%s'\n",
+                       str_buf);
+               rc = -EINVAL;
+               goto cleanup;
+       }
+
+       /* Re-allocate fixed report descriptor */
+       rdesc_len = drvdata->rsize + sizeof(uclogic_buttonpad_rdesc);
+       rdesc = devm_kzalloc(&hdev->dev, rdesc_len, GFP_KERNEL);
+       if (!rdesc) {
+               rc = -ENOMEM;
+               goto cleanup;
+       }
+
+       memcpy(rdesc, drvdata->rdesc, drvdata->rsize);
+
+       /* Append the buttonpad descriptor */
+       memcpy(rdesc + drvdata->rsize, uclogic_buttonpad_rdesc,
+              sizeof(uclogic_buttonpad_rdesc));
+
+       /* clean up old rdesc and use the new one */
+       drvdata->rsize = rdesc_len;
+       devm_kfree(&hdev->dev, drvdata->rdesc);
+       drvdata->rdesc = rdesc;
+
+       rc = 0;
+
+cleanup:
+       kfree(str_buf);
+       return rc;
+}
+
 static int uclogic_probe(struct hid_device *hdev,
                const struct hid_device_id *id)
 {
@@ -878,6 +963,9 @@ static int uclogic_probe(struct hid_device *hdev,
                                return rc;
                        }
                        drvdata->invert_pen_inrange = true;
+
+                       rc = uclogic_button_enable(hdev);
+                       drvdata->has_virtual_pad_interface = !rc;
                } else {
                        drvdata->ignore_pen_usage = true;
                }
@@ -904,12 +992,16 @@ static int uclogic_raw_event(struct hid_device *hdev, struct hid_report *report,
 {
        struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
 
-       if ((drvdata->invert_pen_inrange) &&
-           (report->type == HID_INPUT_REPORT) &&
+       if ((report->type == HID_INPUT_REPORT) &&
            (report->id == UCLOGIC_PEN_REPORT_ID) &&
-           (size >= 2))
-               /* Invert the in-range bit */
-               data[1] ^= 0x40;
+           (size >= 2)) {
+               if (drvdata->has_virtual_pad_interface && (data[1] & 0x20))
+                       /* Change to virtual frame button report ID */
+                       data[0] = 0xf7;
+               else if (drvdata->invert_pen_inrange)
+                       /* Invert the in-range bit */
+                       data[1] ^= 0x40;
+       }
 
        return 0;
 }