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 #include <linux/slab.h>
  25
  26 #include "hid-ids.h"
  27
  28 struct wacom_data {
  29         __u16 tool;
  30         unsigned char butstate;
  31 };
  32
  33 static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report,
  34                 u8 *raw_data, int size)
  35 {
  36         struct wacom_data *wdata = hid_get_drvdata(hdev);
  37         struct hid_input *hidinput;
  38         struct input_dev *input;
  39         unsigned char *data = (unsigned char *) raw_data;
  40         int tool, x, y, rw;
  41
  42         if (!(hdev->claimed & HID_CLAIMED_INPUT))
  43                 return 0;
  44
  45         tool = 0;
  46         hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
  47         input = hidinput->input;
  48
  49         /* Check if this is a tablet report */
  50         if (data[0] != 0x03)
  51                 return 0;
  52
  53         /* Get X & Y positions */
  54         x = le16_to_cpu(*(__le16 *) &data[2]);
  55         y = le16_to_cpu(*(__le16 *) &data[4]);
  56
  57         /* Get current tool identifier */
  58         if (data[1] & 0x90) { /* If pen is in the in/active area */
  59                 switch ((data[1] >> 5) & 3) {
  60                 case 0: /* Pen */
  61                         tool = BTN_TOOL_PEN;
  62                         break;
  63
  64                 case 1: /* Rubber */
  65                         tool = BTN_TOOL_RUBBER;
  66                         break;
  67
  68                 case 2: /* Mouse with wheel */
  69                 case 3: /* Mouse without wheel */
  70                         tool = BTN_TOOL_MOUSE;
  71                         break;
  72                 }
  73
  74                 /* Reset tool if out of active tablet area */
  75                 if (!(data[1] & 0x10))
  76                         tool = 0;
  77         }
  78
  79         /* If tool changed, notify input subsystem */
  80         if (wdata->tool != tool) {
  81                 if (wdata->tool) {
  82                         /* Completely reset old tool state */
  83                         if (wdata->tool == BTN_TOOL_MOUSE) {
  84                                 input_report_key(input, BTN_LEFT, 0);
  85                                 input_report_key(input, BTN_RIGHT, 0);
  86                                 input_report_key(input, BTN_MIDDLE, 0);
  87                                 input_report_abs(input, ABS_DISTANCE,
  88                                                 input->absmax[ABS_DISTANCE]);
  89                         } else {
  90                                 input_report_key(input, BTN_TOUCH, 0);
  91                                 input_report_key(input, BTN_STYLUS, 0);
  92                                 input_report_key(input, BTN_STYLUS2, 0);
  93                                 input_report_abs(input, ABS_PRESSURE, 0);
  94                         }
  95                         input_report_key(input, wdata->tool, 0);
  96                         input_sync(input);
  97                 }
  98                 wdata->tool = tool;
  99                 if (tool)
 100                         input_report_key(input, tool, 1);
 101         }
 102
 103         if (tool) {
 104                 input_report_abs(input, ABS_X, x);
 105                 input_report_abs(input, ABS_Y, y);
 106
 107                 switch ((data[1] >> 5) & 3) {
 108                 case 2: /* Mouse with wheel */
 109                         input_report_key(input, BTN_MIDDLE, data[1] & 0x04);
 110                         rw = (data[6] & 0x01) ? -1 :
 111                                 (data[6] & 0x02) ? 1 : 0;
 112                         input_report_rel(input, REL_WHEEL, rw);
 113                         /* fall through */
 114
 115                 case 3: /* Mouse without wheel */
 116                         input_report_key(input, BTN_LEFT, data[1] & 0x01);
 117                         input_report_key(input, BTN_RIGHT, data[1] & 0x02);
 118                         /* Compute distance between mouse and tablet */
 119                         rw = 44 - (data[6] >> 2);
 120                         if (rw < 0)
 121                                 rw = 0;
 122                         else if (rw > 31)
 123                                 rw = 31;
 124                         input_report_abs(input, ABS_DISTANCE, rw);
 125                         break;
 126
 127                 default:
 128                         input_report_abs(input, ABS_PRESSURE,
 129                                         data[6] | (((__u16) (data[1] & 0x08)) << 5));
 130                         input_report_key(input, BTN_TOUCH, data[1] & 0x01);
 131                         input_report_key(input, BTN_STYLUS, data[1] & 0x02);
 132                         input_report_key(input, BTN_STYLUS2, (tool == BTN_TOOL_PEN) && data[1] & 0x04);
 133                         break;
 134                 }
 135
 136                 input_sync(input);
 137         }
 138
 139         /* Report the state of the two buttons at the top of the tablet
 140          * as two extra fingerpad keys (buttons 4 & 5). */
 141         rw = data[7] & 0x03;
 142         if (rw != wdata->butstate) {
 143                 wdata->butstate = rw;
 144                 input_report_key(input, BTN_0, rw & 0x02);
 145                 input_report_key(input, BTN_1, rw & 0x01);
 146                 input_report_key(input, BTN_TOOL_FINGER, 0xf0);
 147                 input_event(input, EV_MSC, MSC_SERIAL, 0xf0);
 148                 input_sync(input);
 149         }
 150
 151         return 1;
 152 }
 153
 154 static int wacom_probe(struct hid_device *hdev,
 155                 const struct hid_device_id *id)
 156 {
 157         struct hid_input *hidinput;
 158         struct input_dev *input;
 159         struct wacom_data *wdata;
 160         char rep_data[2];
 161         int ret;
 162         int limit;
 163
 164         wdata = kzalloc(sizeof(*wdata), GFP_KERNEL);
 165         if (wdata == NULL) {
 166                 dev_err(&hdev->dev, "can't alloc wacom descriptor\n");
 167                 return -ENOMEM;
 168         }
 169
 170         hid_set_drvdata(hdev, wdata);
 171
 172         /* Parse the HID report now */
 173         ret = hid_parse(hdev);
 174         if (ret) {
 175                 dev_err(&hdev->dev, "parse failed\n");
 176                 goto err_free;
 177         }
 178
 179         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 180         if (ret) {
 181                 dev_err(&hdev->dev, "hw start failed\n");
 182                 goto err_free;
 183         }
 184
 185         /*
 186          * Note that if the raw queries fail, it's not a hard failure and it
 187          * is safe to continue
 188          */
 189
 190         /* Set Wacom mode2 */
 191         rep_data[0] = 0x03; rep_data[1] = 0x00;
 192         limit = 3;
 193         do {
 194                 ret = hdev->hid_output_raw_report(hdev, rep_data, 2,
 195                                 HID_FEATURE_REPORT);
 196         } while (ret < 0 && limit-- > 0);
 197         if (ret < 0)
 198                 dev_warn(&hdev->dev, "failed to poke device #1, %d\n", ret);
 199
 200         /* 0x06 - high reporting speed, 0x05 - low speed */
 201         rep_data[0] = 0x06; rep_data[1] = 0x00;
 202         limit = 3;
 203         do {
 204                 ret = hdev->hid_output_raw_report(hdev, rep_data, 2,
 205                                 HID_FEATURE_REPORT);
 206         } while (ret < 0 && limit-- > 0);
 207         if (ret < 0)
 208                 dev_warn(&hdev->dev, "failed to poke device #2, %d\n", ret);
 209
 210         hidinput = list_entry(hdev->inputs.next, struct hid_input, list);
 211         input = hidinput->input;
 212
 213         /* Basics */
 214         input->evbit[0] |= BIT(EV_KEY) | BIT(EV_ABS) | BIT(EV_REL);
 215         input->absbit[0] |= BIT(ABS_X) | BIT(ABS_Y) |
 216                 BIT(ABS_PRESSURE) | BIT(ABS_DISTANCE);
 217         input->relbit[0] |= BIT(REL_WHEEL);
 218         set_bit(BTN_TOOL_PEN, input->keybit);
 219         set_bit(BTN_TOUCH, input->keybit);
 220         set_bit(BTN_STYLUS, input->keybit);
 221         set_bit(BTN_STYLUS2, input->keybit);
 222         set_bit(BTN_LEFT, input->keybit);
 223         set_bit(BTN_RIGHT, input->keybit);
 224         set_bit(BTN_MIDDLE, input->keybit);
 225
 226         /* Pad */
 227         input->evbit[0] |= BIT(EV_MSC);
 228         input->mscbit[0] |= BIT(MSC_SERIAL);
 229         set_bit(BTN_0, input->keybit);
 230         set_bit(BTN_1, input->keybit);
 231         set_bit(BTN_TOOL_FINGER, input->keybit);
 232
 233         /* Distance, rubber and mouse */
 234         input->absbit[0] |= BIT(ABS_DISTANCE);
 235         set_bit(BTN_TOOL_RUBBER, input->keybit);
 236         set_bit(BTN_TOOL_MOUSE, input->keybit);
 237
 238         input->absmax[ABS_PRESSURE] = 511;
 239         input->absmax[ABS_DISTANCE] = 32;
 240
 241         input->absmax[ABS_X] = 16704;
 242         input->absmax[ABS_Y] = 12064;
 243         input->absfuzz[ABS_X] = 4;
 244         input->absfuzz[ABS_Y] = 4;
 245
 246         return 0;
 247 err_free:
 248         kfree(wdata);
 249         return ret;
 250 }
 251
 252 static void wacom_remove(struct hid_device *hdev)
 253 {
 254         hid_hw_stop(hdev);
 255         kfree(hid_get_drvdata(hdev));
 256 }
 257
 258 static const struct hid_device_id wacom_devices[] = {
 259         { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_WACOM, USB_DEVICE_ID_WACOM_GRAPHIRE_BLUETOOTH) },
 260
 261         { }
 262 };
 263 MODULE_DEVICE_TABLE(hid, wacom_devices);
 264
 265 static struct hid_driver wacom_driver = {
 266         .name = "wacom",
 267         .id_table = wacom_devices,
 268         .probe = wacom_probe,
 269         .remove = wacom_remove,
 270         .raw_event = wacom_raw_event,
 271 };
 272
 273 static int __init wacom_init(void)
 274 {
 275         int ret;
 276
 277         ret = hid_register_driver(&wacom_driver);
 278         if (ret)
 279                 printk(KERN_ERR "can't register wacom driver\n");
 280         return ret;
 281 }
 282
 283 static void __exit wacom_exit(void)
 284 {
 285         hid_unregister_driver(&wacom_driver);
 286 }
 287
 288 module_init(wacom_init);
 289 module_exit(wacom_exit);
 290 MODULE_LICENSE("GPL");
 291