root/drivers/hid/hid-uclogic-core.c

DEFINITIONS

1. uclogic_inrange_timeout
2. uclogic_report_fixup
3. uclogic_input_mapping
4. uclogic_input_configured
5. uclogic_probe
6. uclogic_resume
7. uclogic_raw_event
8. uclogic_remove

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  HID driver for UC-Logic devices not fully compliant with HID standard
   4  *
   5  *  Copyright (c) 2010-2014 Nikolai Kondrashov
   6  *  Copyright (c) 2013 Martin Rusko
   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/timer.h>
  20 #include "usbhid/usbhid.h"
  21 #include "hid-uclogic-params.h"
  22 
  23 #include "hid-ids.h"
  24 
  25 /* Driver data */
  26 struct uclogic_drvdata {
  27         /* Interface parameters */
  28         struct uclogic_params params;
  29         /* Pointer to the replacement report descriptor. NULL if none. */
  30         __u8 *desc_ptr;
  31         /*
  32          * Size of the replacement report descriptor.
  33          * Only valid if desc_ptr is not NULL
  34          */
  35         unsigned int desc_size;
  36         /* Pen input device */
  37         struct input_dev *pen_input;
  38         /* In-range timer */
  39         struct timer_list inrange_timer;
  40         /* Last rotary encoder state, or U8_MAX for none */
  41         u8 re_state;
  42 };
  43 
  44 /**
  45  * uclogic_inrange_timeout - handle pen in-range state timeout.
  46  * Emulate input events normally generated when pen goes out of range for
  47  * tablets which don't report that.
  48  *
  49  * @t:  The timer the timeout handler is attached to, stored in a struct
  50  *      uclogic_drvdata.
  51  */
  52 static void uclogic_inrange_timeout(struct timer_list *t)
  53 {
  54         struct uclogic_drvdata *drvdata = from_timer(drvdata, t,
  55                                                         inrange_timer);
  56         struct input_dev *input = drvdata->pen_input;
  57 
  58         if (input == NULL)
  59                 return;
  60         input_report_abs(input, ABS_PRESSURE, 0);
  61         /* If BTN_TOUCH state is changing */
  62         if (test_bit(BTN_TOUCH, input->key)) {
  63                 input_event(input, EV_MSC, MSC_SCAN,
  64                                 /* Digitizer Tip Switch usage */
  65                                 0xd0042);
  66                 input_report_key(input, BTN_TOUCH, 0);
  67         }
  68         input_report_key(input, BTN_TOOL_PEN, 0);
  69         input_sync(input);
  70 }
  71 
  72 static __u8 *uclogic_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  73                                         unsigned int *rsize)
  74 {
  75         struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
  76 
  77         if (drvdata->desc_ptr != NULL) {
  78                 rdesc = drvdata->desc_ptr;
  79                 *rsize = drvdata->desc_size;
  80         }
  81         return rdesc;
  82 }
  83 
  84 static int uclogic_input_mapping(struct hid_device *hdev,
  85                                  struct hid_input *hi,
  86                                  struct hid_field *field,
  87                                  struct hid_usage *usage,
  88                                  unsigned long **bit,
  89                                  int *max)
  90 {
  91         struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
  92         struct uclogic_params *params = &drvdata->params;
  93 
  94         /* discard the unused pen interface */
  95         if (params->pen_unused && (field->application == HID_DG_PEN))
  96                 return -1;
  97 
  98         /* let hid-core decide what to do */
  99         return 0;
 100 }
 101 
 102 static int uclogic_input_configured(struct hid_device *hdev,
 103                 struct hid_input *hi)
 104 {
 105         struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
 106         struct uclogic_params *params = &drvdata->params;
 107         char *name;
 108         const char *suffix = NULL;
 109         struct hid_field *field;
 110         size_t len;
 111 
 112         /* no report associated (HID_QUIRK_MULTI_INPUT not set) */
 113         if (!hi->report)
 114                 return 0;
 115 
 116         /*
 117          * If this is the input corresponding to the pen report
 118          * in need of tweaking.
 119          */
 120         if (hi->report->id == params->pen.id) {
 121                 /* Remember the input device so we can simulate events */
 122                 drvdata->pen_input = hi->input;
 123         }
 124 
 125         field = hi->report->field[0];
 126 
 127         switch (field->application) {
 128         case HID_GD_KEYBOARD:
 129                 suffix = "Keyboard";
 130                 break;
 131         case HID_GD_MOUSE:
 132                 suffix = "Mouse";
 133                 break;
 134         case HID_GD_KEYPAD:
 135                 suffix = "Pad";
 136                 break;
 137         case HID_DG_PEN:
 138                 suffix = "Pen";
 139                 break;
 140         case HID_CP_CONSUMER_CONTROL:
 141                 suffix = "Consumer Control";
 142                 break;
 143         case HID_GD_SYSTEM_CONTROL:
 144                 suffix = "System Control";
 145                 break;
 146         }
 147 
 148         if (suffix) {
 149                 len = strlen(hdev->name) + 2 + strlen(suffix);
 150                 name = devm_kzalloc(&hi->input->dev, len, GFP_KERNEL);
 151                 if (name) {
 152                         snprintf(name, len, "%s %s", hdev->name, suffix);
 153                         hi->input->name = name;
 154                 }
 155         }
 156 
 157         return 0;
 158 }
 159 
 160 static int uclogic_probe(struct hid_device *hdev,
 161                 const struct hid_device_id *id)
 162 {
 163         int rc;
 164         struct uclogic_drvdata *drvdata = NULL;
 165         bool params_initialized = false;
 166 
 167         /*
 168          * libinput requires the pad interface to be on a different node
 169          * than the pen, so use QUIRK_MULTI_INPUT for all tablets.
 170          */
 171         hdev->quirks |= HID_QUIRK_MULTI_INPUT;
 172 
 173         /* Allocate and assign driver data */
 174         drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
 175         if (drvdata == NULL) {
 176                 rc = -ENOMEM;
 177                 goto failure;
 178         }
 179         timer_setup(&drvdata->inrange_timer, uclogic_inrange_timeout, 0);
 180         drvdata->re_state = U8_MAX;
 181         hid_set_drvdata(hdev, drvdata);
 182 
 183         /* Initialize the device and retrieve interface parameters */
 184         rc = uclogic_params_init(&drvdata->params, hdev);
 185         if (rc != 0) {
 186                 hid_err(hdev, "failed probing parameters: %d\n", rc);
 187                 goto failure;
 188         }
 189         params_initialized = true;
 190         hid_dbg(hdev, "parameters:\n" UCLOGIC_PARAMS_FMT_STR,
 191                 UCLOGIC_PARAMS_FMT_ARGS(&drvdata->params));
 192         if (drvdata->params.invalid) {
 193                 hid_info(hdev, "interface is invalid, ignoring\n");
 194                 rc = -ENODEV;
 195                 goto failure;
 196         }
 197 
 198         /* Generate replacement report descriptor */
 199         rc = uclogic_params_get_desc(&drvdata->params,
 200                                      &drvdata->desc_ptr,
 201                                      &drvdata->desc_size);
 202         if (rc) {
 203                 hid_err(hdev,
 204                         "failed generating replacement report descriptor: %d\n",
 205                         rc);
 206                 goto failure;
 207         }
 208 
 209         rc = hid_parse(hdev);
 210         if (rc) {
 211                 hid_err(hdev, "parse failed\n");
 212                 goto failure;
 213         }
 214 
 215         rc = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 216         if (rc) {
 217                 hid_err(hdev, "hw start failed\n");
 218                 goto failure;
 219         }
 220 
 221         return 0;
 222 failure:
 223         /* Assume "remove" might not be called if "probe" failed */
 224         if (params_initialized)
 225                 uclogic_params_cleanup(&drvdata->params);
 226         return rc;
 227 }
 228 
 229 #ifdef CONFIG_PM
 230 static int uclogic_resume(struct hid_device *hdev)
 231 {
 232         int rc;
 233         struct uclogic_params params;
 234 
 235         /* Re-initialize the device, but discard parameters */
 236         rc = uclogic_params_init(&params, hdev);
 237         if (rc != 0)
 238                 hid_err(hdev, "failed to re-initialize the device\n");
 239         else
 240                 uclogic_params_cleanup(&params);
 241 
 242         return rc;
 243 }
 244 #endif
 245 
 246 static int uclogic_raw_event(struct hid_device *hdev,
 247                                 struct hid_report *report,
 248                                 u8 *data, int size)
 249 {
 250         struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
 251         struct uclogic_params *params = &drvdata->params;
 252 
 253         /* Tweak pen reports, if necessary */
 254         if (!params->pen_unused &&
 255             (report->type == HID_INPUT_REPORT) &&
 256             (report->id == params->pen.id) &&
 257             (size >= 2)) {
 258                 /* If it's the "virtual" frame controls report */
 259                 if (params->frame.id != 0 &&
 260                     data[1] & params->pen_frame_flag) {
 261                         /* Change to virtual frame controls report ID */
 262                         data[0] = params->frame.id;
 263                         return 0;
 264                 }
 265                 /* If in-range reports are inverted */
 266                 if (params->pen.inrange ==
 267                         UCLOGIC_PARAMS_PEN_INRANGE_INVERTED) {
 268                         /* Invert the in-range bit */
 269                         data[1] ^= 0x40;
 270                 }
 271                 /*
 272                  * If report contains fragmented high-resolution pen
 273                  * coordinates
 274                  */
 275                 if (size >= 10 && params->pen.fragmented_hires) {
 276                         u8 pressure_low_byte;
 277                         u8 pressure_high_byte;
 278 
 279                         /* Lift pressure bytes */
 280                         pressure_low_byte = data[6];
 281                         pressure_high_byte = data[7];
 282                         /*
 283                          * Move Y coord to make space for high-order X
 284                          * coord byte
 285                          */
 286                         data[6] = data[5];
 287                         data[5] = data[4];
 288                         /* Move high-order X coord byte */
 289                         data[4] = data[8];
 290                         /* Move high-order Y coord byte */
 291                         data[7] = data[9];
 292                         /* Place pressure bytes */
 293                         data[8] = pressure_low_byte;
 294                         data[9] = pressure_high_byte;
 295                 }
 296                 /* If we need to emulate in-range detection */
 297                 if (params->pen.inrange == UCLOGIC_PARAMS_PEN_INRANGE_NONE) {
 298                         /* Set in-range bit */
 299                         data[1] |= 0x40;
 300                         /* (Re-)start in-range timeout */
 301                         mod_timer(&drvdata->inrange_timer,
 302                                         jiffies + msecs_to_jiffies(100));
 303                 }
 304         }
 305 
 306         /* Tweak frame control reports, if necessary */
 307         if ((report->type == HID_INPUT_REPORT) &&
 308             (report->id == params->frame.id)) {
 309                 /* If need to, and can, set pad device ID for Wacom drivers */
 310                 if (params->frame.dev_id_byte > 0 &&
 311                     params->frame.dev_id_byte < size) {
 312                         data[params->frame.dev_id_byte] = 0xf;
 313                 }
 314                 /* If need to, and can, read rotary encoder state change */
 315                 if (params->frame.re_lsb > 0 &&
 316                     params->frame.re_lsb / 8 < size) {
 317                         unsigned int byte = params->frame.re_lsb / 8;
 318                         unsigned int bit = params->frame.re_lsb % 8;
 319 
 320                         u8 change;
 321                         u8 prev_state = drvdata->re_state;
 322                         /* Read Gray-coded state */
 323                         u8 state = (data[byte] >> bit) & 0x3;
 324                         /* Encode state change into 2-bit signed integer */
 325                         if ((prev_state == 1 && state == 0) ||
 326                             (prev_state == 2 && state == 3)) {
 327                                 change = 1;
 328                         } else if ((prev_state == 2 && state == 0) ||
 329                                    (prev_state == 1 && state == 3)) {
 330                                 change = 3;
 331                         } else {
 332                                 change = 0;
 333                         }
 334                         /* Write change */
 335                         data[byte] = (data[byte] & ~((u8)3 << bit)) |
 336                                         (change << bit);
 337                         /* Remember state */
 338                         drvdata->re_state = state;
 339                 }
 340         }
 341 
 342         return 0;
 343 }
 344 
 345 static void uclogic_remove(struct hid_device *hdev)
 346 {
 347         struct uclogic_drvdata *drvdata = hid_get_drvdata(hdev);
 348 
 349         del_timer_sync(&drvdata->inrange_timer);
 350         hid_hw_stop(hdev);
 351         kfree(drvdata->desc_ptr);
 352         uclogic_params_cleanup(&drvdata->params);
 353 }
 354 
 355 static const struct hid_device_id uclogic_devices[] = {
 356         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 357                                 USB_DEVICE_ID_UCLOGIC_TABLET_PF1209) },
 358         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 359                                 USB_DEVICE_ID_UCLOGIC_TABLET_WP4030U) },
 360         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 361                                 USB_DEVICE_ID_UCLOGIC_TABLET_WP5540U) },
 362         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 363                                 USB_DEVICE_ID_UCLOGIC_TABLET_WP8060U) },
 364         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 365                                 USB_DEVICE_ID_UCLOGIC_TABLET_WP1062) },
 366         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 367                                 USB_DEVICE_ID_UCLOGIC_WIRELESS_TABLET_TWHL850) },
 368         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 369                                 USB_DEVICE_ID_UCLOGIC_TABLET_TWHA60) },
 370         { HID_USB_DEVICE(USB_VENDOR_ID_HUION,
 371                                 USB_DEVICE_ID_HUION_TABLET) },
 372         { HID_USB_DEVICE(USB_VENDOR_ID_HUION,
 373                                 USB_DEVICE_ID_HUION_HS64) },
 374         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 375                                 USB_DEVICE_ID_HUION_TABLET) },
 376         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 377                                 USB_DEVICE_ID_YIYNOVA_TABLET) },
 378         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 379                                 USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_81) },
 380         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 381                                 USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_45) },
 382         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 383                                 USB_DEVICE_ID_UCLOGIC_UGEE_TABLET_47) },
 384         { HID_USB_DEVICE(USB_VENDOR_ID_UCLOGIC,
 385                                 USB_DEVICE_ID_UCLOGIC_DRAWIMAGE_G3) },
 386         { HID_USB_DEVICE(USB_VENDOR_ID_UGTIZER,
 387                                 USB_DEVICE_ID_UGTIZER_TABLET_GP0610) },
 388         { HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 389                                 USB_DEVICE_ID_UGEE_TABLET_G5) },
 390         { HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 391                                 USB_DEVICE_ID_UGEE_TABLET_EX07S) },
 392         { HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 393                                 USB_DEVICE_ID_UGEE_TABLET_RAINBOW_CV720) },
 394         { HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 395                                 USB_DEVICE_ID_UGEE_XPPEN_TABLET_G540) },
 396         { HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 397                                 USB_DEVICE_ID_UGEE_XPPEN_TABLET_G640) },
 398         { HID_USB_DEVICE(USB_VENDOR_ID_UGEE,
 399                                 USB_DEVICE_ID_UGEE_XPPEN_TABLET_DECO01) },
 400         { }
 401 };
 402 MODULE_DEVICE_TABLE(hid, uclogic_devices);
 403 
 404 static struct hid_driver uclogic_driver = {
 405         .name = "uclogic",
 406         .id_table = uclogic_devices,
 407         .probe = uclogic_probe,
 408         .remove = uclogic_remove,
 409         .report_fixup = uclogic_report_fixup,
 410         .raw_event = uclogic_raw_event,
 411         .input_mapping = uclogic_input_mapping,
 412         .input_configured = uclogic_input_configured,
 413 #ifdef CONFIG_PM
 414         .resume           = uclogic_resume,
 415         .reset_resume     = uclogic_resume,
 416 #endif
 417 };
 418 module_hid_driver(uclogic_driver);
 419 
 420 MODULE_AUTHOR("Martin Rusko");
 421 MODULE_AUTHOR("Nikolai Kondrashov");
 422 MODULE_LICENSE("GPL");