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Linux/drivers/hid/hid-huion.c

  1 /*
  2  *  HID driver for Huion devices not fully compliant with HID standard
  3  *
  4  *  Copyright (c) 2013 Martin Rusko
  5  */
  6 
  7 /*
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License as published by the Free
 10  * Software Foundation; either version 2 of the License, or (at your option)
 11  * any later version.
 12  */
 13 
 14 #include <linux/device.h>
 15 #include <linux/hid.h>
 16 #include <linux/module.h>
 17 #include <linux/usb.h>
 18 #include "usbhid/usbhid.h"
 19 
 20 #include "hid-ids.h"
 21 
 22 /* Original Huion 580 report descriptor size */
 23 #define HUION_580_RDESC_ORIG_SIZE       177
 24 
 25 /* Fixed Huion 580 report descriptor */
 26 static __u8 huion_580_rdesc_fixed[] = {
 27         0x05, 0x0D,         /*  Usage Page (Digitizer),             */
 28         0x09, 0x02,         /*  Usage (Pen),                        */
 29         0xA1, 0x01,         /*  Collection (Application),           */
 30         0x85, 0x07,         /*      Report ID (7),                  */
 31         0x09, 0x20,         /*      Usage (Stylus),                 */
 32         0xA0,               /*      Collection (Physical),          */
 33         0x14,               /*          Logical Minimum (0),        */
 34         0x25, 0x01,         /*          Logical Maximum (1),        */
 35         0x75, 0x01,         /*          Report Size (1),            */
 36         0x09, 0x42,         /*          Usage (Tip Switch),         */
 37         0x09, 0x44,         /*          Usage (Barrel Switch),      */
 38         0x09, 0x46,         /*          Usage (Tablet Pick),        */
 39         0x95, 0x03,         /*          Report Count (3),           */
 40         0x81, 0x02,         /*          Input (Variable),           */
 41         0x95, 0x03,         /*          Report Count (3),           */
 42         0x81, 0x03,         /*          Input (Constant, Variable), */
 43         0x09, 0x32,         /*          Usage (In Range),           */
 44         0x95, 0x01,         /*          Report Count (1),           */
 45         0x81, 0x02,         /*          Input (Variable),           */
 46         0x95, 0x01,         /*          Report Count (1),           */
 47         0x81, 0x03,         /*          Input (Constant, Variable), */
 48         0x75, 0x10,         /*          Report Size (16),           */
 49         0x95, 0x01,         /*          Report Count (1),           */
 50         0xA4,               /*          Push,                       */
 51         0x05, 0x01,         /*          Usage Page (Desktop),       */
 52         0x65, 0x13,         /*          Unit (Inch),                */
 53         0x55, 0xFD,         /*          Unit Exponent (-3),         */
 54         0x34,               /*          Physical Minimum (0),       */
 55         0x09, 0x30,         /*          Usage (X),                  */
 56         0x46, 0x40, 0x1F,   /*          Physical Maximum (8000),    */
 57         0x26, 0x00, 0x7D,   /*          Logical Maximum (32000),    */
 58         0x81, 0x02,         /*          Input (Variable),           */
 59         0x09, 0x31,         /*          Usage (Y),                  */
 60         0x46, 0x88, 0x13,   /*          Physical Maximum (5000),    */
 61         0x26, 0x20, 0x4E,   /*          Logical Maximum (20000),    */
 62         0x81, 0x02,         /*          Input (Variable),           */
 63         0xB4,               /*          Pop,                        */
 64         0x09, 0x30,         /*          Usage (Tip Pressure),       */
 65         0x26, 0xFF, 0x07,   /*          Logical Maximum (2047),     */
 66         0x81, 0x02,         /*          Input (Variable),           */
 67         0xC0,               /*      End Collection,                 */
 68         0xC0                /*  End Collection                      */
 69 };
 70 
 71 static __u8 *huion_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 72                 unsigned int *rsize)
 73 {
 74         switch (hdev->product) {
 75         case USB_DEVICE_ID_HUION_580:
 76                 if (*rsize == HUION_580_RDESC_ORIG_SIZE) {
 77                         rdesc = huion_580_rdesc_fixed;
 78                         *rsize = sizeof(huion_580_rdesc_fixed);
 79                 }
 80                 break;
 81         }
 82         return rdesc;
 83 }
 84 
 85 /**
 86  * Enable fully-functional tablet mode by reading special string
 87  * descriptor.
 88  *
 89  * @hdev:       HID device
 90  *
 91  * The specific string descriptor and data were discovered by sniffing
 92  * the Windows driver traffic.
 93  */
 94 static int huion_tablet_enable(struct hid_device *hdev)
 95 {
 96         int rc;
 97         char buf[22];
 98 
 99         rc = usb_string(hid_to_usb_dev(hdev), 0x64, buf, sizeof(buf));
100         if (rc < 0)
101                 return rc;
102 
103         return 0;
104 }
105 
106 static int huion_probe(struct hid_device *hdev, const struct hid_device_id *id)
107 {
108         int ret;
109         struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
110 
111         /* Ignore interfaces 1 (mouse) and 2 (keyboard) for Huion 580 tablet,
112          * as they are not used
113          */
114         switch (id->product) {
115         case USB_DEVICE_ID_HUION_580:
116                 if (intf->cur_altsetting->desc.bInterfaceNumber != 0x00)
117                         return -ENODEV;
118                 break;
119         }
120 
121         ret = hid_parse(hdev);
122         if (ret) {
123                 hid_err(hdev, "parse failed\n");
124                 goto err;
125         }
126 
127         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
128         if (ret) {
129                 hid_err(hdev, "hw start failed\n");
130                 goto err;
131         }
132 
133         switch (id->product) {
134         case USB_DEVICE_ID_HUION_580:
135                 ret = huion_tablet_enable(hdev);
136                 if (ret) {
137                         hid_err(hdev, "tablet enabling failed\n");
138                         goto enabling_err;
139                 }
140                 break;
141         }
142 
143         return 0;
144 enabling_err:
145         hid_hw_stop(hdev);
146 err:
147         return ret;
148 }
149 
150 static int huion_raw_event(struct hid_device *hdev, struct hid_report *report,
151                         u8 *data, int size)
152 {
153         /* If this is a pen input report then invert the in-range bit */
154         if (report->type == HID_INPUT_REPORT && report->id == 0x07 && size >= 2)
155                 data[1] ^= 0x40;
156 
157         return 0;
158 }
159 
160 static const struct hid_device_id huion_devices[] = {
161         { HID_USB_DEVICE(USB_VENDOR_ID_HUION, USB_DEVICE_ID_HUION_580) },
162         { }
163 };
164 MODULE_DEVICE_TABLE(hid, huion_devices);
165 
166 static struct hid_driver huion_driver = {
167         .name = "huion",
168         .id_table = huion_devices,
169         .probe = huion_probe,
170         .report_fixup = huion_report_fixup,
171         .raw_event = huion_raw_event,
172 };
173 module_hid_driver(huion_driver);
174 
175 MODULE_AUTHOR("Martin Rusko");
176 MODULE_DESCRIPTION("Huion HID driver");
177 MODULE_LICENSE("GPL");
178 

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