173 lines
5.5 KiB
C
173 lines
5.5 KiB
C
/*
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* HID driver for Huion devices not fully compliant with HID standard
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*
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* Copyright (c) 2013 Martin Rusko
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* Copyright (c) 2014 Nikolai Kondrashov
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include "usbhid/usbhid.h"
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#include "hid-ids.h"
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/* Original tablet report descriptor size */
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#define HUION_TABLET_RDESC_ORIG_SIZE 177
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/* Fixed tablet report descriptor */
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static __u8 huion_tablet_rdesc_fixed[] = {
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0x05, 0x0D, /* Usage Page (Digitizer), */
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0x09, 0x02, /* Usage (Pen), */
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0xA1, 0x01, /* Collection (Application), */
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0x85, 0x07, /* Report ID (7), */
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0x09, 0x20, /* Usage (Stylus), */
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0xA0, /* Collection (Physical), */
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0x14, /* Logical Minimum (0), */
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0x25, 0x01, /* Logical Maximum (1), */
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0x75, 0x01, /* Report Size (1), */
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0x09, 0x42, /* Usage (Tip Switch), */
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0x09, 0x44, /* Usage (Barrel Switch), */
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0x09, 0x46, /* Usage (Tablet Pick), */
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0x95, 0x03, /* Report Count (3), */
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0x81, 0x02, /* Input (Variable), */
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0x95, 0x03, /* Report Count (3), */
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0x81, 0x03, /* Input (Constant, Variable), */
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0x09, 0x32, /* Usage (In Range), */
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0x95, 0x01, /* Report Count (1), */
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0x81, 0x02, /* Input (Variable), */
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0x95, 0x01, /* Report Count (1), */
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0x81, 0x03, /* Input (Constant, Variable), */
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0x75, 0x10, /* Report Size (16), */
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0x95, 0x01, /* Report Count (1), */
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0xA4, /* Push, */
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0x05, 0x01, /* Usage Page (Desktop), */
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0x65, 0x13, /* Unit (Inch), */
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0x55, 0xFD, /* Unit Exponent (-3), */
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0x34, /* Physical Minimum (0), */
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0x09, 0x30, /* Usage (X), */
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0x46, 0x40, 0x1F, /* Physical Maximum (8000), */
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0x26, 0x00, 0x7D, /* Logical Maximum (32000), */
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0x81, 0x02, /* Input (Variable), */
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0x09, 0x31, /* Usage (Y), */
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0x46, 0x88, 0x13, /* Physical Maximum (5000), */
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0x26, 0x20, 0x4E, /* Logical Maximum (20000), */
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0x81, 0x02, /* Input (Variable), */
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0xB4, /* Pop, */
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0x09, 0x30, /* Usage (Tip Pressure), */
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0x26, 0xFF, 0x07, /* Logical Maximum (2047), */
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0x81, 0x02, /* Input (Variable), */
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0xC0, /* End Collection, */
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0xC0 /* End Collection */
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};
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static __u8 *huion_report_fixup(struct hid_device *hdev, __u8 *rdesc,
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unsigned int *rsize)
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{
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switch (hdev->product) {
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case USB_DEVICE_ID_HUION_TABLET:
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if (*rsize == HUION_TABLET_RDESC_ORIG_SIZE) {
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rdesc = huion_tablet_rdesc_fixed;
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*rsize = sizeof(huion_tablet_rdesc_fixed);
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}
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break;
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}
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return rdesc;
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}
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/**
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* Enable fully-functional tablet mode by reading special string
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* descriptor.
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*
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* @hdev: HID device
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*
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* The specific string descriptor and data were discovered by sniffing
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* the Windows driver traffic.
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*/
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static int huion_tablet_enable(struct hid_device *hdev)
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{
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int rc;
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char buf[22];
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rc = usb_string(hid_to_usb_dev(hdev), 0x64, buf, sizeof(buf));
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if (rc < 0)
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return rc;
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return 0;
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}
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static int huion_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int ret;
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ret = hid_parse(hdev);
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if (ret) {
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hid_err(hdev, "parse failed\n");
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goto err;
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}
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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if (ret) {
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hid_err(hdev, "hw start failed\n");
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goto err;
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}
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switch (id->product) {
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case USB_DEVICE_ID_HUION_TABLET:
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ret = huion_tablet_enable(hdev);
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if (ret) {
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hid_err(hdev, "tablet enabling failed\n");
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goto enabling_err;
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}
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break;
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}
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return 0;
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enabling_err:
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hid_hw_stop(hdev);
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err:
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return ret;
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}
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static int huion_raw_event(struct hid_device *hdev, struct hid_report *report,
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u8 *data, int size)
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{
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struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
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/* If this is a pen input report */
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if (intf->cur_altsetting->desc.bInterfaceNumber == 0 &&
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report->type == HID_INPUT_REPORT &&
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report->id == 0x07 && size >= 2)
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/* Invert the in-range bit */
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data[1] ^= 0x40;
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return 0;
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}
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static const struct hid_device_id huion_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_HUION, USB_DEVICE_ID_HUION_TABLET) },
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{ }
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};
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MODULE_DEVICE_TABLE(hid, huion_devices);
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static struct hid_driver huion_driver = {
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.name = "huion",
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.id_table = huion_devices,
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.probe = huion_probe,
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.report_fixup = huion_report_fixup,
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.raw_event = huion_raw_event,
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};
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module_hid_driver(huion_driver);
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MODULE_AUTHOR("Martin Rusko");
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MODULE_DESCRIPTION("Huion HID driver");
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MODULE_LICENSE("GPL");
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