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path: root/drivers/hid/hid-waltop.c
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Diffstat (limited to 'drivers/hid/hid-waltop.c')
-rw-r--r--drivers/hid/hid-waltop.c230
1 files changed, 194 insertions, 36 deletions
diff --git a/drivers/hid/hid-waltop.c b/drivers/hid/hid-waltop.c
index 2cfd95c4467b..745e4e9a8cf2 100644
--- a/drivers/hid/hid-waltop.c
+++ b/drivers/hid/hid-waltop.c
@@ -502,28 +502,146 @@ static __u8 media_tablet_14_1_inch_rdesc_fixed[] = {
0xC0 /* End Collection */
};
-struct waltop_state {
- u8 pressure0;
- u8 pressure1;
+/*
+ * See Sirius Battery Free Tablet description, device and HID report descriptors
+ * at
+ * http://sf.net/apps/mediawiki/digimend/?title=Waltop_Sirius_Battery_Free_Tablet
+ */
+
+/* Size of the original report descriptor of Sirius Battery Free Tablet */
+#define SIRIUS_BATTERY_FREE_TABLET_RDESC_ORIG_SIZE 335
+
+/* Fixed Sirius Battery Free Tablet descriptor */
+static __u8 sirius_battery_free_tablet_rdesc_fixed[] = {
+ 0x05, 0x0D, /* Usage Page (Digitizer), */
+ 0x09, 0x02, /* Usage (Pen), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x10, /* Report ID (16), */
+ 0x09, 0x20, /* Usage (Stylus), */
+ 0xA0, /* Collection (Physical), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x15, 0x01, /* Logical Minimum (1), */
+ 0x25, 0x03, /* Logical Maximum (3), */
+ 0x75, 0x02, /* Report Size (2), */
+ 0x09, 0x42, /* Usage (Tip Switch), */
+ 0x09, 0x44, /* Usage (Barrel Switch), */
+ 0x09, 0x46, /* Usage (Tablet Pick), */
+ 0x80, /* Input, */
+ 0x14, /* Logical Minimum (0), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x09, 0x3C, /* Usage (Invert), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0x09, 0x32, /* Usage (In Range), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x95, 0x03, /* Report Count (3), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0xA4, /* Push, */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x55, 0xFD, /* Unit Exponent (-3), */
+ 0x65, 0x13, /* Unit (Inch), */
+ 0x34, /* Physical Minimum (0), */
+ 0x14, /* Logical Minimum (0), */
+ 0x75, 0x10, /* Report Size (16), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x46, 0x10, 0x27, /* Physical Maximum (10000), */
+ 0x26, 0x20, 0x4E, /* Logical Maximum (20000), */
+ 0x09, 0x30, /* Usage (X), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x46, 0x70, 0x17, /* Physical Maximum (6000), */
+ 0x26, 0xE0, 0x2E, /* Logical Maximum (12000), */
+ 0x09, 0x31, /* Usage (Y), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0xB4, /* Pop, */
+ 0x75, 0x10, /* Report Size (16), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x14, /* Logical Minimum (0), */
+ 0x26, 0xFF, 0x03, /* Logical Maximum (1023), */
+ 0x09, 0x30, /* Usage (Tip Pressure), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0xA4, /* Push, */
+ 0x55, 0xFE, /* Unit Exponent (-2), */
+ 0x65, 0x12, /* Unit (Radians), */
+ 0x35, 0x97, /* Physical Minimum (-105), */
+ 0x45, 0x69, /* Physical Maximum (105), */
+ 0x15, 0x97, /* Logical Minimum (-105), */
+ 0x25, 0x69, /* Logical Maximum (105), */
+ 0x75, 0x08, /* Report Size (8), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0x09, 0x3D, /* Usage (X Tilt), */
+ 0x09, 0x3E, /* Usage (Y Tilt), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0xB4, /* Pop, */
+ 0xC0, /* End Collection, */
+ 0xC0, /* End Collection, */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x09, 0x02, /* Usage (Mouse), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x01, /* Report ID (1), */
+ 0x09, 0x01, /* Usage (Pointer), */
+ 0xA0, /* Collection (Physical), */
+ 0x75, 0x08, /* Report Size (8), */
+ 0x95, 0x03, /* Report Count (3), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0x09, 0x38, /* Usage (Wheel), */
+ 0x15, 0xFF, /* Logical Minimum (-1), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x75, 0x08, /* Report Size (8), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x81, 0x06, /* Input (Variable, Relative), */
+ 0x75, 0x08, /* Report Size (8), */
+ 0x95, 0x03, /* Report Count (3), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0xC0, /* End Collection, */
+ 0xC0, /* End Collection, */
+ 0x05, 0x01, /* Usage Page (Desktop), */
+ 0x09, 0x06, /* Usage (Keyboard), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x0D, /* Report ID (13), */
+ 0x05, 0x07, /* Usage Page (Keyboard), */
+ 0x19, 0xE0, /* Usage Minimum (KB Leftcontrol), */
+ 0x29, 0xE7, /* Usage Maximum (KB Right GUI), */
+ 0x14, /* Logical Minimum (0), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x08, /* Report Count (8), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x75, 0x08, /* Report Size (8), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x81, 0x01, /* Input (Constant), */
+ 0x18, /* Usage Minimum (None), */
+ 0x29, 0x65, /* Usage Maximum (KB Application), */
+ 0x14, /* Logical Minimum (0), */
+ 0x25, 0x65, /* Logical Maximum (101), */
+ 0x75, 0x08, /* Report Size (8), */
+ 0x95, 0x05, /* Report Count (5), */
+ 0x80, /* Input, */
+ 0xC0, /* End Collection, */
+ 0x05, 0x0C, /* Usage Page (Consumer), */
+ 0x09, 0x01, /* Usage (Consumer Control), */
+ 0xA1, 0x01, /* Collection (Application), */
+ 0x85, 0x0C, /* Report ID (12), */
+ 0x09, 0xE9, /* Usage (Volume Inc), */
+ 0x09, 0xEA, /* Usage (Volume Dec), */
+ 0x14, /* Logical Minimum (0), */
+ 0x25, 0x01, /* Logical Maximum (1), */
+ 0x75, 0x01, /* Report Size (1), */
+ 0x95, 0x02, /* Report Count (2), */
+ 0x81, 0x02, /* Input (Variable), */
+ 0x75, 0x06, /* Report Size (6), */
+ 0x95, 0x01, /* Report Count (1), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0x75, 0x10, /* Report Size (16), */
+ 0x95, 0x03, /* Report Count (3), */
+ 0x81, 0x03, /* Input (Constant, Variable), */
+ 0xC0 /* End Collection */
};
static int waltop_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
int ret;
- struct waltop_state *s;
-
- s = kzalloc(sizeof(*s), GFP_KERNEL);
- if (s == NULL) {
- hid_err(hdev, "can't allocate device state\n");
- ret = -ENOMEM;
- goto err;
- }
-
- s->pressure0 = 0;
- s->pressure1 = 0;
-
- hid_set_drvdata(hdev, s);
ret = hid_parse(hdev);
if (ret) {
@@ -539,7 +657,6 @@ static int waltop_probe(struct hid_device *hdev,
return 0;
err:
- kfree(s);
return ret;
}
@@ -583,6 +700,12 @@ static __u8 *waltop_report_fixup(struct hid_device *hdev, __u8 *rdesc,
*rsize = sizeof(media_tablet_14_1_inch_rdesc_fixed);
}
break;
+ case USB_DEVICE_ID_WALTOP_SIRIUS_BATTERY_FREE_TABLET:
+ if (*rsize == SIRIUS_BATTERY_FREE_TABLET_RDESC_ORIG_SIZE) {
+ rdesc = sirius_battery_free_tablet_rdesc_fixed;
+ *rsize = sizeof(sirius_battery_free_tablet_rdesc_fixed);
+ }
+ break;
}
return rdesc;
}
@@ -590,39 +713,72 @@ static __u8 *waltop_report_fixup(struct hid_device *hdev, __u8 *rdesc,
static int waltop_raw_event(struct hid_device *hdev, struct hid_report *report,
u8 *data, int size)
{
- /* If this is a pen input report of a tablet with PID 0038 */
- if (hdev->product == USB_DEVICE_ID_WALTOP_PID_0038 &&
- report->type == HID_INPUT_REPORT &&
- report->id == 16 &&
- size == 8) {
- struct waltop_state *s = hid_get_drvdata(hdev);
-
+ /* If this is a pen input report */
+ if (report->type == HID_INPUT_REPORT && report->id == 16 && size >= 8) {
/*
- * Ignore maximum pressure reported when a barrel button is
- * pressed.
+ * Ignore reported pressure when a barrel button is pressed,
+ * because it is rarely correct.
*/
/* If a barrel button is pressed */
if ((data[1] & 0xF) > 1) {
- /* Use the last known pressure */
- data[6] = s->pressure0;
- data[7] = s->pressure1;
- } else {
- /* Remember reported pressure */
- s->pressure0 = data[6];
- s->pressure1 = data[7];
+ /* Report zero pressure */
+ data[6] = 0;
+ data[7] = 0;
}
}
+ /* If this is a pen input report of Sirius Battery Free Tablet */
+ if (hdev->product == USB_DEVICE_ID_WALTOP_SIRIUS_BATTERY_FREE_TABLET &&
+ report->type == HID_INPUT_REPORT &&
+ report->id == 16 &&
+ size == 10) {
+ /*
+ * The tablet reports tilt as roughly sin(a)*21 (18 means 60
+ * degrees).
+ *
+ * This array stores angles as radians * 100, corresponding to
+ * reported values up to 60 degrees, as expected by userspace.
+ */
+ static const s8 tilt_to_radians[] = {
+ 0, 5, 10, 14, 19, 24, 29, 34, 40, 45,
+ 50, 56, 62, 68, 74, 81, 88, 96, 105
+ };
+
+ s8 tilt_x = (s8)data[8];
+ s8 tilt_y = (s8)data[9];
+ s8 sign_x = tilt_x >= 0 ? 1 : -1;
+ s8 sign_y = tilt_y >= 0 ? 1 : -1;
+
+ tilt_x *= sign_x;
+ tilt_y *= sign_y;
+
+ /*
+ * Reverse the Y Tilt direction to match the HID standard and
+ * userspace expectations. See HID Usage Tables v1.12 16.3.2
+ * Tilt Orientation.
+ */
+ sign_y *= -1;
+
+ /*
+ * This effectively clamps reported tilt to 60 degrees - the
+ * range expected by userspace
+ */
+ if (tilt_x > ARRAY_SIZE(tilt_to_radians) - 1)
+ tilt_x = ARRAY_SIZE(tilt_to_radians) - 1;
+ if (tilt_y > ARRAY_SIZE(tilt_to_radians) - 1)
+ tilt_y = ARRAY_SIZE(tilt_to_radians) - 1;
+
+ data[8] = tilt_to_radians[tilt_x] * sign_x;
+ data[9] = tilt_to_radians[tilt_y] * sign_y;
+ }
+
return 0;
}
static void waltop_remove(struct hid_device *hdev)
{
- struct waltop_state *s = hid_get_drvdata(hdev);
-
hid_hw_stop(hdev);
- kfree(s);
}
static const struct hid_device_id waltop_devices[] = {
@@ -638,6 +794,8 @@ static const struct hid_device_id waltop_devices[] = {
USB_DEVICE_ID_WALTOP_MEDIA_TABLET_10_6_INCH) },
{ HID_USB_DEVICE(USB_VENDOR_ID_WALTOP,
USB_DEVICE_ID_WALTOP_MEDIA_TABLET_14_1_INCH) },
+ { HID_USB_DEVICE(USB_VENDOR_ID_WALTOP,
+ USB_DEVICE_ID_WALTOP_SIRIUS_BATTERY_FREE_TABLET) },
{ }
};
MODULE_DEVICE_TABLE(hid, waltop_devices);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.