drivers/hid/hid-mosart.c

   1 /*
   2  *  HID driver for the multitouch panel on the ASUS EeePC T91MT
   3  *
   4  *  Copyright (c) 2009-2010 Stephane Chatty <chatty@enac.fr>
   5  *  Copyright (c) 2010 Teemu Tuominen <teemu.tuominen@cybercom.com>
   6  *
   7  */
   8
   9 /*
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the Free
  12  * Software Foundation; either version 2 of the License, or (at your option)
  13  * any later version.
  14  */
  15
  16 #include <linux/device.h>
  17 #include <linux/hid.h>
  18 #include <linux/module.h>
  19 #include <linux/slab.h>
  20 #include <linux/usb.h>
  21 #include "usbhid/usbhid.h"
  22
  23 MODULE_AUTHOR("Stephane Chatty <chatty@enac.fr>");
  24 MODULE_DESCRIPTION("MosArt dual-touch panel");
  25 MODULE_LICENSE("GPL");
  26
  27 #include "hid-ids.h"
  28
  29 struct mosart_data {
  30         __u16 x, y;
  31         __u8 id;
  32         bool valid;             /* valid finger data, or just placeholder? */
  33         bool first;             /* is this the first finger in this frame? */
  34         bool activity_now;      /* at least one active finger in this frame? */
  35         bool activity;          /* at least one active finger previously? */
  36 };
  37
  38 static int mosart_input_mapping(struct hid_device *hdev, struct hid_input *hi,
  39                 struct hid_field *field, struct hid_usage *usage,
  40                 unsigned long **bit, int *max)
  41 {
  42         switch (usage->hid & HID_USAGE_PAGE) {
  43
  44         case HID_UP_GENDESK:
  45                 switch (usage->hid) {
  46                 case HID_GD_X:
  47                         hid_map_usage(hi, usage, bit, max,
  48                                         EV_ABS, ABS_MT_POSITION_X);
  49                         /* touchscreen emulation */
  50                         input_set_abs_params(hi->input, ABS_X,
  51                                                 field->logical_minimum,
  52                                                 field->logical_maximum, 0, 0);
  53                         return 1;
  54                 case HID_GD_Y:
  55                         hid_map_usage(hi, usage, bit, max,
  56                                         EV_ABS, ABS_MT_POSITION_Y);
  57                         /* touchscreen emulation */
  58                         input_set_abs_params(hi->input, ABS_Y,
  59                                                 field->logical_minimum,
  60                                                 field->logical_maximum, 0, 0);
  61                         return 1;
  62                 }
  63                 return 0;
  64
  65         case HID_UP_DIGITIZER:
  66                 switch (usage->hid) {
  67                 case HID_DG_CONFIDENCE:
  68                 case HID_DG_TIPSWITCH:
  69                 case HID_DG_INPUTMODE:
  70                 case HID_DG_DEVICEINDEX:
  71                 case HID_DG_CONTACTCOUNT:
  72                 case HID_DG_CONTACTMAX:
  73                 case HID_DG_TIPPRESSURE:
  74                 case HID_DG_WIDTH:
  75                 case HID_DG_HEIGHT:
  76                         return -1;
  77                 case HID_DG_INRANGE:
  78                         /* touchscreen emulation */
  79                         hid_map_usage(hi, usage, bit, max, EV_KEY, BTN_TOUCH);
  80                         return 1;
  81
  82                 case HID_DG_CONTACTID:
  83                         hid_map_usage(hi, usage, bit, max,
  84                                         EV_ABS, ABS_MT_TRACKING_ID);
  85                         return 1;
  86
  87                 }
  88                 return 0;
  89
  90         case 0xff000000:
  91                 /* ignore HID features */
  92                 return -1;
  93         }
  94
  95         return 0;
  96 }
  97
  98 static int mosart_input_mapped(struct hid_device *hdev, struct hid_input *hi,
  99                 struct hid_field *field, struct hid_usage *usage,
 100                 unsigned long **bit, int *max)
 101 {
 102         if (usage->type == EV_KEY || usage->type == EV_ABS)
 103                 clear_bit(usage->code, *bit);
 104
 105         return 0;
 106 }
 107
 108 /*
 109  * this function is called when a whole finger has been parsed,
 110  * so that it can decide what to send to the input layer.
 111  */
 112 static void mosart_filter_event(struct mosart_data *td, struct input_dev *input)
 113 {
 114         td->first = !td->first; /* touchscreen emulation */
 115
 116         if (!td->valid) {
 117                 /*
 118                  * touchscreen emulation: if no finger in this frame is valid
 119                  * and there previously was finger activity, this is a release
 120                  */
 121                 if (!td->first && !td->activity_now && td->activity) {
 122                         input_event(input, EV_KEY, BTN_TOUCH, 0);
 123                         td->activity = false;
 124                 }
 125                 return;
 126         }
 127
 128         input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
 129         input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
 130         input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
 131
 132         input_mt_sync(input);
 133         td->valid = false;
 134
 135         /* touchscreen emulation: if first active finger in this frame... */
 136         if (!td->activity_now) {
 137                 /* if there was no previous activity, emit touch event */
 138                 if (!td->activity) {
 139                         input_event(input, EV_KEY, BTN_TOUCH, 1);
 140                         td->activity = true;
 141                 }
 142                 td->activity_now = true;
 143                 /* and in any case this is our preferred finger */
 144                 input_event(input, EV_ABS, ABS_X, td->x);
 145                 input_event(input, EV_ABS, ABS_Y, td->y);
 146         }
 147 }
 148
 149
 150 static int mosart_event(struct hid_device *hid, struct hid_field *field,
 151                                 struct hid_usage *usage, __s32 value)
 152 {
 153         struct mosart_data *td = hid_get_drvdata(hid);
 154
 155         if (hid->claimed & HID_CLAIMED_INPUT) {
 156                 struct input_dev *input = field->hidinput->input;
 157                 switch (usage->hid) {
 158                 case HID_DG_INRANGE:
 159                         td->valid = !!value;
 160                         break;
 161                 case HID_GD_X:
 162                         td->x = value;
 163                         break;
 164                 case HID_GD_Y:
 165                         td->y = value;
 166                         mosart_filter_event(td, input);
 167                         break;
 168                 case HID_DG_CONTACTID:
 169                         td->id = value;
 170                         break;
 171                 case HID_DG_CONTACTCOUNT:
 172                         /* touch emulation: this is the last field in a frame */
 173                         td->first = false;
 174                         td->activity_now = false;
 175                         break;
 176                 case HID_DG_CONFIDENCE:
 177                 case HID_DG_TIPSWITCH:
 178                         /* avoid interference from generic hidinput handling */
 179                         break;
 180
 181                 default:
 182                         /* fallback to the generic hidinput handling */
 183                         return 0;
 184                 }
 185         }
 186
 187         /* we have handled the hidinput part, now remains hiddev */
 188         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
 189                 hid->hiddev_hid_event(hid, field, usage, value);
 190
 191         return 1;
 192 }
 193
 194 static int mosart_probe(struct hid_device *hdev, const struct hid_device_id *id)
 195 {
 196         int ret;
 197         struct mosart_data *td;
 198
 199
 200         td = kmalloc(sizeof(struct mosart_data), GFP_KERNEL);
 201         if (!td) {
 202                 dev_err(&hdev->dev, "cannot allocate MosArt data\n");
 203                 return -ENOMEM;
 204         }
 205         td->valid = false;
 206         td->activity = false;
 207         td->activity_now = false;
 208         td->first = false;
 209         hid_set_drvdata(hdev, td);
 210
 211         /* currently, it's better to have one evdev device only */
 212 #if 0
 213         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
 214 #endif
 215
 216         ret = hid_parse(hdev);
 217         if (ret == 0)
 218                 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 219
 220         if (ret == 0) {
 221                 struct hid_report_enum *re = hdev->report_enum
 222                                                 + HID_FEATURE_REPORT;
 223                 struct hid_report *r = re->report_id_hash[7];
 224
 225                 r->field[0]->value[0] = 0x02;
 226                 usbhid_submit_report(hdev, r, USB_DIR_OUT);
 227         } else
 228                 kfree(td);
 229
 230         return ret;
 231 }
 232
 233 static void mosart_remove(struct hid_device *hdev)
 234 {
 235         hid_hw_stop(hdev);
 236         kfree(hid_get_drvdata(hdev));
 237         hid_set_drvdata(hdev, NULL);
 238 }
 239
 240 static const struct hid_device_id mosart_devices[] = {
 241         { HID_USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_T91MT) },
 242         { }
 243 };
 244 MODULE_DEVICE_TABLE(hid, mosart_devices);
 245
 246 static const struct hid_usage_id mosart_grabbed_usages[] = {
 247         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
 248         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
 249 };
 250
 251 static struct hid_driver mosart_driver = {
 252         .name = "mosart",
 253         .id_table = mosart_devices,
 254         .probe = mosart_probe,
 255         .remove = mosart_remove,
 256         .input_mapping = mosart_input_mapping,
 257         .input_mapped = mosart_input_mapped,
 258         .usage_table = mosart_grabbed_usages,
 259         .event = mosart_event,
 260 };
 261
 262 static int __init mosart_init(void)
 263 {
 264         return hid_register_driver(&mosart_driver);
 265 }
 266
 267 static void __exit mosart_exit(void)
 268 {
 269         hid_unregister_driver(&mosart_driver);
 270 }
 271
 272 module_init(mosart_init);
 273 module_exit(mosart_exit);
 274