drivers/hid/hid-wacom.c

   1 /*
   2  *  Bluetooth Wacom Tablet support
   3  *
   4  *  Copyright (c) 1999 Andreas Gal
   5  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
   6  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
   7  *  Copyright (c) 2006-2007 Jiri Kosina
   8  *  Copyright (c) 2007 Paul Walmsley
   9  *  Copyright (c) 2008 Jiri Slaby <jirislaby@gmail.com>
  10  *  Copyright (c) 2006 Andrew Zabolotny <zap@homelink.ru>
  11  *  Copyright (c) 2009 Bastien Nocera <hadess@hadess.net>
  12  */
  13
  14 /*
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License as published by the Free
  17  * Software Foundation; either version 2 of the License, or (at your option)
  18  * any later version.
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/hid.h>
  23 #include <linux/module.h>
  24
  25 #include "hid-ids.h"
  26
  27 struct wacom_data {
  28         __u16 tool;
  29         unsigned char butstate;
  30 };
  31
  32 static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
  33                 u8 *raw_data, int size)
  34 {
  35         struct wacom_data *wdata = hid_get_drvdata(hdev);
  36         struct hid_input *hidinput;
  37         struct input_dev *input;
  38         unsigned char *data = (unsigned char *) raw_data;
  39         int tool, x, y, rw;
  40
  41         if (!(hdev->claimed & HID_CLAIMED_INPUT))
  42                 return 0;
  43
  44         tool = 0;
  45         hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
  46         input = hidinput->input;
  47
  48         /* Check if this is a tablet report */
  49         if (data[0] != 0x03)
  50                 return 0;
  51
  52         /* Get X & Y positions */
  53         x = le16_to_cpu(*(__le16 *) &data[2]);
  54         y = le16_to_cpu(*(__le16 *) &data[4]);
  55
  56         /* Get current tool identifier */
  57         if (data[1] & 0x90) { /* If pen is in the in/active area */
  58                 switch ((data[1] >> 5) & 3) {
  59                 case 0: /* Pen */
  60                         tool = BTN_TOOL_PEN;
  61                         break;
  62
  63                 case 1: /* Rubber */
  64                         tool = BTN_TOOL_RUBBER;
  65                         break;
  66
  67                 case 2: /* Mouse with wheel */
  68                 case 3: /* Mouse without wheel */
  69                         tool = BTN_TOOL_MOUSE;
  70                         break;
  71                 }
  72
  73                 /* Reset tool if out of active tablet area */
  74                 if (!(data[1] & 0x10))
  75                         tool = 0;
  76         }
  77
  78         /* If tool changed, notify input subsystem */
  79         if (wdata->tool != tool) {
  80                 if (wdata->tool) {
  81                         /* Completely reset old tool state */
  82                         if (wdata->tool == BTN_TOOL_MOUSE) {
  83                                 input_report_key(input, BTN_LEFT, 0);
  84                                 input_report_key(input, BTN_RIGHT, 0);
  85                                 input_report_key(input, BTN_MIDDLE, 0);
  86                                 input_report_abs(input, ABS_DISTANCE,
  87                                                 input->absmax[ABS_DISTANCE]);
  88                         } else {
  89                                 input_report_key(input, BTN_TOUCH, 0);
  90                                 input_report_key(input, BTN_STYLUS, 0);
  91                                 input_report_key(input, BTN_STYLUS2, 0);
  92                                 input_report_abs(input, ABS_PRESSURE, 0);
  93                         }
  94                         input_report_key(input, wdata->tool, 0);
  95                         input_sync(input);
  96                 }
  97                 wdata->tool = tool;
  98                 if (tool)
  99                         input_report_key(input, tool, 1);
 100         }
 101
 102         if (tool) {
 103                 input_report_abs(input, ABS_X, x);
 104                 input_report_abs(input, ABS_Y, y);
 105
 106                 switch ((data[1] >> 5) & 3) {
 107                 case 2: /* Mouse with wheel */
 108                         input_report_key(input, BTN_MIDDLE, data[1] & 0x04);
 109                         rw = (data[6] & 0x01) ? -1 :
 110                                 (data[6] & 0x02) ? 1 : 0;
 111                         input_report_rel(input, REL_WHEEL, rw);
 112                         /* fall through */
 113
 114                 case 3: /* Mouse without wheel */
 115                         input_report_key(input, BTN_LEFT, data[1] & 0x01);
 116                         input_report_key(input, BTN_RIGHT, data[1] & 0x02);
 117                         /* Compute distance between mouse and tablet */
 118                         rw = 44 - (data[6] >> 2);
 119                         if (rw < 0)
 120                                 rw = 0;
 121                         else if (rw > 31)
 122                                 rw = 31;
 123                         input_report_abs(input, ABS_DISTANCE, rw);
 124                         break;
 125
 126                 default:
 127                         input_report_abs(input, ABS_PRESSURE,
 128                                         data[6] | (((__u16) (data[1] & 0x08)) << 5));
 129                         input_report_key(input, BTN_TOUCH, data[1] & 0x01);
 130                         input_report_key(input, BTN_STYLUS, data[1] & 0x02);
 131                         input_report_key(input, BTN_STYLUS2, (tool == BTN_TOOL_PEN) && data[1] & 0x04);
 132                         break;
 133                 }
 134
 135                 input_sync(input);
 136         }
 137
 138         /* Report the state of the two buttons at the top of the tablet
 139          * as two extra fingerpad keys (buttons 4 & 5). */
 140         rw = data[7] & 0x03;
 141         if (rw != wdata->butstate) {
 142                 wdata->butstate = rw;
 143                 input_report_key(input, BTN_0, rw & 0x02);
 144                 input_report_key(input, BTN_1, rw & 0x01);
 145                 input_event(input, EV_MSC, MSC_SERIAL, 0xf0);
 146                 input_sync(input);
 147         }
 148
 149         return 1;
 150 }
 151
 152 static int wacom_probe(struct hid_device *hdev,
 153                 const struct hid_device_id *id)
 154 {
 155         struct hid_input *hidinput;
 156         struct input_dev *input;
 157         struct wacom_data *wdata;
 158         int ret;
 159
 160         wdata = kzalloc(sizeof(*wdata), GFP_KERNEL);
 161         if (wdata == NULL) {
 162                 dev_err(&hdev->dev, "can't alloc wacom descriptor\n");
 163                 return -ENOMEM;
 164         }
 165
 166         hid_set_drvdata(hdev, wdata);
 167
 168         ret = hid_parse(hdev);
 169         if (ret) {
 170                 dev_err(&hdev->dev, "parse failed\n");
 171                 goto err_free;
 172         }
 173
 174         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 175         if (ret) {
 176                 dev_err(&hdev->dev, "hw start failed\n");
 177                 goto err_free;
 178         }
 179
 180         hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
 181         input = hidinput->input;
 182
 183         /* Basics */
 184         input->evbit[0] |= BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_REL);
 185         input->absbit[0] |= BIT(ABS_X) | BIT(ABS_Y) |
 186                 BIT(ABS_PRESSURE) | BIT(ABS_DISTANCE);
 187         input->relbit[0] |= BIT(REL_WHEEL);
 188         set_bit(BTN_TOOL_PEN, input->keybit);
 189         set_bit(BTN_TOUCH, input->keybit);
 190         set_bit(BTN_STYLUS, input->keybit);
 191         set_bit(BTN_STYLUS2, input->keybit);
 192         set_bit(BTN_LEFT, input->keybit);
 193         set_bit(BTN_RIGHT, input->keybit);
 194         set_bit(BTN_MIDDLE, input->keybit);
 195
 196         /* Pad */
 197         input->evbit[0] |= BIT(EV_MSC);
 198         input->mscbit[0] |= BIT(MSC_SERIAL);
 199
 200         /* Distance, rubber and mouse */
 201         input->absbit[0] |= BIT(ABS_DISTANCE);
 202         set_bit(BTN_TOOL_RUBBER, input->keybit);
 203         set_bit(BTN_TOOL_MOUSE, input->keybit);
 204
 205         input->absmax[ABS_PRESSURE] = 511;
 206         input->absmax[ABS_DISTANCE] = 32;
 207
 208         input->absmax[ABS_X] = 16704;
 209         input->absmax[ABS_Y] = 12064;
 210         input->absfuzz[ABS_X] = 4;
 211         input->absfuzz[ABS_Y] = 4;
 212
 213         return 0;
 214 err_free:
 215         kfree(wdata);
 216         return ret;
 217 }
 218
 219 static void wacom_remove(struct hid_device *hdev)
 220 {
 221         hid_hw_stop(hdev);
 222         kfree(hid_get_drvdata(hdev));
 223 }
 224
 225 static const struct hid_device_id wacom_devices[] = {
 226         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_GRAPHIRE_BLUETOOTH) },
 227
 228         { }
 229 };
 230 MODULE_DEVICE_TABLE(hid, wacom_devices);
 231
 232 static struct hid_driver wacom_driver = {
 233         .name = "wacom",
 234         .id_table = wacom_devices,
 235         .probe = wacom_probe,
 236         .remove = wacom_remove,
 237         .raw_event = wacom_raw_event,
 238 };
 239
 240 static int wacom_init(void)
 241 {
 242         int ret;
 243
 244         ret = hid_register_driver(&wacom_driver);
 245         if (ret)
 246                 printk(KERN_ERR "can't register wacom driver\n");
 247         printk(KERN_ERR "wacom driver registered\n");
 248         return ret;
 249 }
 250
 251 static void wacom_exit(void)
 252 {
 253         hid_unregister_driver(&wacom_driver);
 254 }
 255
 256 module_init(wacom_init);
 257 module_exit(wacom_exit);
 258 MODULE_LICENSE("GPL");
 259