1 files changed, 418 insertions, 0 deletions

diff --git a/drivers/hid/hid-uclogic-core.c b/drivers/hid/hid-uclogic-core.c
new file mode 100644
index 000000000000..8fe02d81265d
--- /dev/null
+++ b/drivers/hid/hid-uclogic-core.c
@@ -0,0 +1,418 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  HID driver for UC-Logic devices not fully compliant with HID standard
+ *
+ *  Copyright (c) 2010-2014 Nikolai Kondrashov
+ *  Copyright (c) 2013 Martin Rusko
+ */
+
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/hid.h>
+#include <linux/module.h>
+#include <linux/timer.h>
+#include "usbhid/usbhid.h"
+#include "hid-uclogic-params.h"
+
+#include "hid-ids.h"
+
+/* Driver data */
+struct uclogic_drvdata {
+	/* Interface parameters */
+	struct uclogic_params params;
+	/* Pointer to the replacement report descriptor. NULL if none. */
+	__u8 *desc_ptr;
+	/*
+	 * Size of the replacement report descriptor.
+	 * Only valid if desc_ptr is not NULL
+	 */
+	unsigned int desc_size;
+	/* Pen input device */
+	struct input_dev *pen_input;
+	/* In-range timer */
+	struct timer_list inrange_timer;
+	/* Last rotary encoder state, or U8_MAX for none */
+	u8 re_state;
+};
+
+/**
+ * uclogic_inrange_timeout - handle pen in-range state timeout.
+ * Emulate input events normally generated when pen goes out of range for
+ * tablets which don't report that.
+ *
+ * @t:	The timer the timeout handler is attached to, stored in a struct
+ *	uclogic_drvdata.
+ */
+static void uclogic_inrange_timeout(struct timer_list *t)
+{
+	struct uclogic_drvdata *drvdata = from_timer(drvdata, t,
+							inrange_timer);
+	struct input_dev *input = drvdata->pen_input;
+
+	if (input == NULL)
+		return;
+	input_report_abs(input, ABS_PRESSURE, 0);
+	/* If BTN_TOUCH state is changing */
+	if (test_bit(BTN_TOUCH, input->key)) {
+		input_event(input, EV_MSC, MSC_SCAN,
+				/* Digitizer Tip Switch usage */
+				0xd0042);
+		input_report_key(input, BTN_TOUCH, 0);
+	}
+	input_report_key(input, BTN_TOOL_PEN, 0);
+	input_sync(input);
+}
+
+static __u8 *uclogic_report_fixup(struct hid_device *hdev, __u8 *rdesc,
+					unsigned int *rsize)
+{
+	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
+
+	if (drvdata->desc_ptr != NULL) {
+		rdesc = drvdata->desc_ptr;
+		*rsize = drvdata->desc_size;
+	}
+	return rdesc;
+}
+
+static int uclogic_input_mapping(struct hid_device *hdev,
+				 struct hid_input *hi,
+				 struct hid_field *field,
+				 struct hid_usage *usage,
+				 unsigned long **bit,
+				 int *max)
+{
+	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
+	struct uclogic_params *params = &drvdata->params;
+
+	/* discard the unused pen interface */
+	if (params->pen_unused && (field->application == HID_DG_PEN))
+		return -1;
+
+	/* let hid-core decide what to do */
+	return 0;
+}
+
+static int uclogic_input_configured(struct hid_device *hdev,
+		struct hid_input *hi)
+{
+	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
+	struct uclogic_params *params = &drvdata->params;
+	char *name;
+	const char *suffix = NULL;
+	struct hid_field *field;
+	size_t len;
+
+	/* no report associated (HID_QUIRK_MULTI_INPUT not set) */
+	if (!hi->report)
+		return 0;
+
+	/*
+	 * If this is the input corresponding to the pen report
+	 * in need of tweaking.
+	 */
+	if (hi->report->id == params->pen.id) {
+		/* Remember the input device so we can simulate events */
+		drvdata->pen_input = hi->input;
+	}
+
+	field = hi->report->field[0];
+
+	switch (field->application) {
+	case HID_GD_KEYBOARD:
+		suffix = "Keyboard";
+		break;
+	case HID_GD_MOUSE:
+		suffix = "Mouse";
+		break;
+	case HID_GD_KEYPAD:
+		suffix = "Pad";
+		break;
+	case HID_DG_PEN:
+		suffix = "Pen";
+		break;
+	case HID_CP_CONSUMER_CONTROL:
+		suffix = "Consumer Control";
+		break;
+	case HID_GD_SYSTEM_CONTROL:
+		suffix = "System Control";
+		break;
+	}
+
+	if (suffix) {
+		len = strlen(hdev->name) + 2 + strlen(suffix);
+		name = devm_kzalloc(&hi->input->dev, len, GFP_KERNEL);
+		if (name) {
+			snprintf(name, len, "%s %s", hdev->name, suffix);
+			hi->input->name = name;
+		}
+	}
+
+	return 0;
+}
+
+static int uclogic_probe(struct hid_device *hdev,
+		const struct hid_device_id *id)
+{
+	int rc;
+	struct uclogic_drvdata *drvdata = NULL;
+	bool params_initialized = false;
+
+	/*
+	 * libinput requires the pad interface to be on a different node
+	 * than the pen, so use QUIRK_MULTI_INPUT for all tablets.
+	 */
+	hdev->quirks |= HID_QUIRK_MULTI_INPUT;
+
+	/* Allocate and assign driver data */
+	drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
+	if (drvdata == NULL) {
+		rc = -ENOMEM;
+		goto failure;
+	}
+	timer_setup(&drvdata->inrange_timer, uclogic_inrange_timeout, 0);
+	drvdata->re_state = U8_MAX;
+	hid_set_drvdata(hdev, drvdata);
+
+	/* Initialize the device and retrieve interface parameters */
+	rc = uclogic_params_init(&drvdata->params, hdev);
+	if (rc != 0) {
+		hid_err(hdev, "failed probing parameters: %d\n", rc);
+		goto failure;
+	}
+	params_initialized = true;
+	hid_dbg(hdev, "parameters:\n" UCLOGIC_PARAMS_FMT_STR,
+		UCLOGIC_PARAMS_FMT_ARGS(&drvdata->params));
+	if (drvdata->params.invalid) {
+		hid_info(hdev, "interface is invalid, ignoring\n");
+		rc = -ENODEV;
+		goto failure;
+	}
+
+	/* Generate replacement report descriptor */
+	rc = uclogic_params_get_desc(&drvdata->params,
+				     &drvdata->desc_ptr,
+				     &drvdata->desc_size);
+	if (rc) {
+		hid_err(hdev,
+			"failed generating replacement report descriptor: %d\n",
+			rc);
+		goto failure;
+	}
+
+	rc = hid_parse(hdev);
+	if (rc) {
+		hid_err(hdev, "parse failed\n");
+		goto failure;
+	}
+
+	rc = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	if (rc) {
+		hid_err(hdev, "hw start failed\n");
+		goto failure;
+	}
+
+	return 0;
+failure:
+	/* Assume "remove" might not be called if "probe" failed */
+	if (params_initialized)
+		uclogic_params_cleanup(&drvdata->params);
+	return rc;
+}
+
+#ifdef CONFIG_PM
+static int uclogic_resume(struct hid_device *hdev)
+{
+	int rc;
+	struct uclogic_params params;
+
+	/* Re-initialize the device, but discard parameters */
+	rc = uclogic_params_init(&params, hdev);
+	if (rc != 0)
+		hid_err(hdev, "failed to re-initialize the device\n");
+	else
+		uclogic_params_cleanup(&params);
+
+	return rc;
+}
+#endif
+
+static int uclogic_raw_event(struct hid_device *hdev,
+				struct hid_report *report,
+				u8 *data, int size)
+{
+	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
+	struct uclogic_params *params = &drvdata->params;
+
+	/* Tweak pen reports, if necessary */
+	if (!params->pen_unused &&
+	    (report->type == HID_INPUT_REPORT) &&
+	    (report->id == params->pen.id) &&
+	    (size >= 2)) {
+		/* If it's the "virtual" frame controls report */
+		if (params->frame.id != 0 &&
+		    data[1] & params->pen_frame_flag) {
+			/* Change to virtual frame controls report ID */
+			data[0] = params->frame.id;
+			return 0;
+		}
+		/* If in-range reports are inverted */
+		if (params->pen.inrange ==
+			UCLOGIC_PARAMS_PEN_INRANGE_INVERTED) {
+			/* Invert the in-range bit */
+			data[1] ^= 0x40;
+		}
+		/*
+		 * If report contains fragmented high-resolution pen
+		 * coordinates
+		 */
+		if (size >= 10 && params->pen.fragmented_hires) {
+			u8 pressure_low_byte;
+			u8 pressure_high_byte;
+
+			/* Lift pressure bytes */
+			pressure_low_byte = data[6];
+			pressure_high_byte = data[7];
+			/*
+			 * Move Y coord to make space for high-order X
+			 * coord byte
+			 */
+			data[6] = data[5];
+			data[5] = data[4];
+			/* Move high-order X coord byte */
+			data[4] = data[8];
+			/* Move high-order Y coord byte */
+			data[7] = data[9];
+			/* Place pressure bytes */
+			data[8] = pressure_low_byte;
+			data[9] = pressure_high_byte;
+		}
+		/* If we need to emulate in-range detection */
+		if (params->pen.inrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE) {
+			/* Set in-range bit */
+			data[1] |= 0x40;
+			/* (Re-)start in-range timeout */
+			mod_timer(&drvdata->inrange_timer,
+					jiffies + msecs_to_jiffies(100));
+		}
+	}
+
+	/* Tweak frame control reports, if necessary */
+	if ((report->type == HID_INPUT_REPORT) &&
+	    (report->id == params->frame.id)) {
+		/* If need to, and can, set pad device ID for Wacom drivers */
+		if (params->frame.dev_id_byte > 0 &&
+		    params->frame.dev_id_byte < size) {
+			data[params->frame.dev_id_byte] = 0xf;
+		}
+		/* If need to, and can, read rotary encoder state change */
+		if (params->frame.re_lsb > 0 &&
+		    params->frame.re_lsb / 8 < size) {
+			unsigned int byte = params->frame.re_lsb / 8;
+			unsigned int bit = params->frame.re_lsb % 8;
+
+			u8 change;
+			u8 prev_state = drvdata->re_state;
+			/* Read Gray-coded state */
+			u8 state = (data[byte] >> bit) & 0x3;
+			/* Encode state change into 2-bit signed integer */
+			if ((prev_state == 1 && state == 0) ||
+			    (prev_state == 2 && state == 3)) {
+				change = 1;
+			} else if ((prev_state == 2 && state == 0) ||
+				   (prev_state == 1 && state == 3)) {
+				change = 3;
+			} else {
+				change = 0;
+			}
+			/* Write change */
+			data[byte] = (data[byte] & ~((u8)3 << bit)) |
+					(change << bit);
+			/* Remember state */
+			drvdata->re_state = state;
+		}
+	}
+
+	return 0;
+}
+
+static void uclogic_remove(struct hid_device *hdev)
+{
+	struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
+
+	del_timer_sync(&drvdata->inrange_timer);
+	hid_hw_stop(hdev);
+	kfree(drvdata->desc_ptr);
+	uclogic_params_cleanup(&drvdata->params);
+}
+
+static const struct hid_device_id uclogic_devices[] = {
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_TABLET_PF1209) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_TABLET_WP4030U) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_TABLET_WP5540U) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_TABLET_WP8060U) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_TABLET_WP1062) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_WIRELESS_TABLET_TWHL850) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_TABLET_TWHA60) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_HUION,
+				USB_DEVICE_ID_HUION_TABLET) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_HUION_TABLET) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_YIYNOVA_TABLET) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_81) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_45) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_47) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
+				USB_DEVICE_ID_UCLOGIC_DRAWIMAGE_G3) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UGTIZER,
+				USB_DEVICE_ID_UGTIZER_TABLET_GP0610) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
+				USB_DEVICE_ID_UGEE_TABLET_G5) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
+				USB_DEVICE_ID_UGEE_TABLET_EX07S) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
+				USB_DEVICE_ID_UGEE_XPPEN_TABLET_G540) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
+				USB_DEVICE_ID_UGEE_XPPEN_TABLET_G640) },
+	{ HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
+				USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01) },
+	{ }
+};
+MODULE_DEVICE_TABLE(hid, uclogic_devices);
+
+static struct hid_driver uclogic_driver = {
+	.name = "uclogic",
+	.id_table = uclogic_devices,
+	.probe = uclogic_probe,
+	.remove = uclogic_remove,
+	.report_fixup = uclogic_report_fixup,
+	.raw_event = uclogic_raw_event,
+	.input_mapping = uclogic_input_mapping,
+	.input_configured = uclogic_input_configured,
+#ifdef CONFIG_PM
+	.resume	          = uclogic_resume,
+	.reset_resume     = uclogic_resume,
+#endif
+};
+module_hid_driver(uclogic_driver);
+
+MODULE_AUTHOR("Martin Rusko");
+MODULE_AUTHOR("Nikolai Kondrashov");
+MODULE_LICENSE("GPL");