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         case HID_UP_BUTTON:
  95                 /* ignore buttons */
  96                 return -1;
  97         }
  98
  99         return 0;
 100 }
 101
 102 static int mosart_input_mapped(struct hid_device *hdev, struct hid_input *hi,
 103                 struct hid_field *field, struct hid_usage *usage,
 104                 unsigned long **bit, int *max)
 105 {
 106         if (usage->type == EV_KEY || usage->type == EV_ABS)
 107                 clear_bit(usage->code, *bit);
 108
 109         return 0;
 110 }
 111
 112 /*
 113  * this function is called when a whole finger has been parsed,
 114  * so that it can decide what to send to the input layer.
 115  */
 116 static void mosart_filter_event(struct mosart_data *td, struct input_dev *input)
 117 {
 118         td->first = !td->first; /* touchscreen emulation */
 119
 120         if (!td->valid) {
 121                 /*
 122                  * touchscreen emulation: if no finger in this frame is valid
 123                  * and there previously was finger activity, this is a release
 124                  */
 125                 if (!td->first && !td->activity_now && td->activity) {
 126                         input_event(input, EV_KEY, BTN_TOUCH, 0);
 127                         td->activity = false;
 128                 }
 129                 return;
 130         }
 131
 132         input_event(input, EV_ABS, ABS_MT_TRACKING_ID, td->id);
 133         input_event(input, EV_ABS, ABS_MT_POSITION_X, td->x);
 134         input_event(input, EV_ABS, ABS_MT_POSITION_Y, td->y);
 135
 136         input_mt_sync(input);
 137         td->valid = false;
 138
 139         /* touchscreen emulation: if first active finger in this frame... */
 140         if (!td->activity_now) {
 141                 /* if there was no previous activity, emit touch event */
 142                 if (!td->activity) {
 143                         input_event(input, EV_KEY, BTN_TOUCH, 1);
 144                         td->activity = true;
 145                 }
 146                 td->activity_now = true;
 147                 /* and in any case this is our preferred finger */
 148                 input_event(input, EV_ABS, ABS_X, td->x);
 149                 input_event(input, EV_ABS, ABS_Y, td->y);
 150         }
 151 }
 152
 153
 154 static int mosart_event(struct hid_device *hid, struct hid_field *field,
 155                                 struct hid_usage *usage, __s32 value)
 156 {
 157         struct mosart_data *td = hid_get_drvdata(hid);
 158
 159         if (hid->claimed & HID_CLAIMED_INPUT) {
 160                 struct input_dev *input = field->hidinput->input;
 161                 switch (usage->hid) {
 162                 case HID_DG_INRANGE:
 163                         td->valid = !!value;
 164                         break;
 165                 case HID_GD_X:
 166                         td->x = value;
 167                         break;
 168                 case HID_GD_Y:
 169                         td->y = value;
 170                         mosart_filter_event(td, input);
 171                         break;
 172                 case HID_DG_CONTACTID:
 173                         td->id = value;
 174                         break;
 175                 case HID_DG_CONTACTCOUNT:
 176                         /* touch emulation: this is the last field in a frame */
 177                         td->first = false;
 178                         td->activity_now = false;
 179                         break;
 180                 case HID_DG_CONFIDENCE:
 181                 case HID_DG_TIPSWITCH:
 182                         /* avoid interference from generic hidinput handling */
 183                         break;
 184
 185                 default:
 186                         /* fallback to the generic hidinput handling */
 187                         return 0;
 188                 }
 189         }
 190
 191         /* we have handled the hidinput part, now remains hiddev */
 192         if (hid->claimed & HID_CLAIMED_HIDDEV && hid->hiddev_hid_event)
 193                 hid->hiddev_hid_event(hid, field, usage, value);
 194
 195         return 1;
 196 }
 197
 198 static int mosart_probe(struct hid_device *hdev, const struct hid_device_id *id)
 199 {
 200         int ret;
 201         struct mosart_data *td;
 202
 203
 204         td = kmalloc(sizeof(struct mosart_data), GFP_KERNEL);
 205         if (!td) {
 206                 hid_err(hdev, "cannot allocate MosArt data\n");
 207                 return -ENOMEM;
 208         }
 209         td->valid = false;
 210         td->activity = false;
 211         td->activity_now = false;
 212         td->first = false;
 213         hid_set_drvdata(hdev, td);
 214
 215         /* currently, it's better to have one evdev device only */
 216 #if 0
 217         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
 218 #endif
 219
 220         ret = hid_parse(hdev);
 221         if (ret == 0)
 222                 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 223
 224         if (ret == 0) {
 225                 struct hid_report_enum *re = hdev->report_enum
 226                                                 + HID_FEATURE_REPORT;
 227                 struct hid_report *r = re->report_id_hash[7];
 228
 229                 r->field[0]->value[0] = 0x02;
 230                 usbhid_submit_report(hdev, r, USB_DIR_OUT);
 231         } else
 232                 kfree(td);
 233
 234         return ret;
 235 }
 236
 237 #ifdef CONFIG_PM
 238 static int mosart_reset_resume(struct hid_device *hdev)
 239 {
 240         struct hid_report_enum *re = hdev->report_enum
 241                                                 + HID_FEATURE_REPORT;
 242         struct hid_report *r = re->report_id_hash[7];
 243
 244         r->field[0]->value[0] = 0x02;
 245         usbhid_submit_report(hdev, r, USB_DIR_OUT);
 246         return 0;
 247 }
 248 #endif
 249
 250 static void mosart_remove(struct hid_device *hdev)
 251 {
 252         hid_hw_stop(hdev);
 253         kfree(hid_get_drvdata(hdev));
 254         hid_set_drvdata(hdev, NULL);
 255 }
 256
 257 static const struct hid_device_id mosart_devices[] = {
 258         { HID_USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUS_T91MT) },
 259         { HID_USB_DEVICE(USB_VENDOR_ID_ASUS, USB_DEVICE_ID_ASUSTEK_MULTITOUCH_YFO) },
 260         { HID_USB_DEVICE(USB_VENDOR_ID_TURBOX, USB_DEVICE_ID_TURBOX_TOUCHSCREEN_MOSART) },
 261         { }
 262 };
 263 MODULE_DEVICE_TABLE(hid, mosart_devices);
 264
 265 static const struct hid_usage_id mosart_grabbed_usages[] = {
 266         { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID },
 267         { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1}
 268 };
 269
 270 static struct hid_driver mosart_driver = {
 271         .name = "mosart",
 272         .id_table = mosart_devices,
 273         .probe = mosart_probe,
 274         .remove = mosart_remove,
 275         .input_mapping = mosart_input_mapping,
 276         .input_mapped = mosart_input_mapped,
 277         .usage_table = mosart_grabbed_usages,
 278         .event = mosart_event,
 279 #ifdef CONFIG_PM
 280         .reset_resume = mosart_reset_resume,
 281 #endif
 282 };
 283
 284 static int __init mosart_init(void)
 285 {
 286         return hid_register_driver(&mosart_driver);
 287 }
 288
 289 static void __exit mosart_exit(void)
 290 {
 291         hid_unregister_driver(&mosart_driver);
 292 }
 293
 294 module_init(mosart_init);
 295 module_exit(mosart_exit);
 296