linux/drivers/hid/hid-picolcd_core.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/***************************************************************************
   3 *   Copyright (C) 2010-2012 by Bruno Prémont <bonbons@linux-vserver.org>  *
   4 *                                                                         *
   5 *   Based on Logitech G13 driver (v0.4)                                   *
   6 *     Copyright (C) 2009 by Rick L. Vinyard, Jr. <rvinyard@cs.nmsu.edu>   *
   7 *                                                                         *
   8 ***************************************************************************/
   9
  10#include <linux/hid.h>
  11#include <linux/hid-debug.h>
  12#include <linux/input.h>
  13#include "hid-ids.h"
  14
  15#include <linux/fb.h>
  16#include <linux/vmalloc.h>
  17
  18#include <linux/completion.h>
  19#include <linux/uaccess.h>
  20#include <linux/module.h>
  21#include <linux/string.h>
  22
  23#include "hid-picolcd.h"
  24
  25
  26/* Input device
  27 *
  28 * The PicoLCD has an IR receiver header, a built-in keypad with 5 keys
  29 * and header for 4x4 key matrix. The built-in keys are part of the matrix.
  30 */
  31static const unsigned short def_keymap[PICOLCD_KEYS] = {
  32        KEY_RESERVED,   /* none */
  33        KEY_BACK,       /* col 4 + row 1 */
  34        KEY_HOMEPAGE,   /* col 3 + row 1 */
  35        KEY_RESERVED,   /* col 2 + row 1 */
  36        KEY_RESERVED,   /* col 1 + row 1 */
  37        KEY_SCROLLUP,   /* col 4 + row 2 */
  38        KEY_OK,         /* col 3 + row 2 */
  39        KEY_SCROLLDOWN, /* col 2 + row 2 */
  40        KEY_RESERVED,   /* col 1 + row 2 */
  41        KEY_RESERVED,   /* col 4 + row 3 */
  42        KEY_RESERVED,   /* col 3 + row 3 */
  43        KEY_RESERVED,   /* col 2 + row 3 */
  44        KEY_RESERVED,   /* col 1 + row 3 */
  45        KEY_RESERVED,   /* col 4 + row 4 */
  46        KEY_RESERVED,   /* col 3 + row 4 */
  47        KEY_RESERVED,   /* col 2 + row 4 */
  48        KEY_RESERVED,   /* col 1 + row 4 */
  49};
  50
  51
  52/* Find a given report */
  53struct hid_report *picolcd_report(int id, struct hid_device *hdev, int dir)
  54{
  55        struct list_head *feature_report_list = &hdev->report_enum[dir].report_list;
  56        struct hid_report *report = NULL;
  57
  58        list_for_each_entry(report, feature_report_list, list) {
  59                if (report->id == id)
  60                        return report;
  61        }
  62        hid_warn(hdev, "No report with id 0x%x found\n", id);
  63        return NULL;
  64}
  65
  66/* Submit a report and wait for a reply from device - if device fades away
  67 * or does not respond in time, return NULL */
  68struct picolcd_pending *picolcd_send_and_wait(struct hid_device *hdev,
  69                int report_id, const u8 *raw_data, int size)
  70{
  71        struct picolcd_data *data = hid_get_drvdata(hdev);
  72        struct picolcd_pending *work;
  73        struct hid_report *report = picolcd_out_report(report_id, hdev);
  74        unsigned long flags;
  75        int i, j, k;
  76
  77        if (!report || !data)
  78                return NULL;
  79        if (data->status & PICOLCD_FAILED)
  80                return NULL;
  81        work = kzalloc(sizeof(*work), GFP_KERNEL);
  82        if (!work)
  83                return NULL;
  84
  85        init_completion(&work->ready);
  86        work->out_report = report;
  87        work->in_report  = NULL;
  88        work->raw_size   = 0;
  89
  90        mutex_lock(&data->mutex);
  91        spin_lock_irqsave(&data->lock, flags);
  92        for (i = k = 0; i < report->maxfield; i++)
  93                for (j = 0; j < report->field[i]->report_count; j++) {
  94                        hid_set_field(report->field[i], j, k < size ? raw_data[k] : 0);
  95                        k++;
  96                }
  97        if (data->status & PICOLCD_FAILED) {
  98                kfree(work);
  99                work = NULL;
 100        } else {
 101                data->pending = work;
 102                hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
 103                spin_unlock_irqrestore(&data->lock, flags);
 104                wait_for_completion_interruptible_timeout(&work->ready, HZ*2);
 105                spin_lock_irqsave(&data->lock, flags);
 106                data->pending = NULL;
 107        }
 108        spin_unlock_irqrestore(&data->lock, flags);
 109        mutex_unlock(&data->mutex);
 110        return work;
 111}
 112
 113/*
 114 * input class device
 115 */
 116static int picolcd_raw_keypad(struct picolcd_data *data,
 117                struct hid_report *report, u8 *raw_data, int size)
 118{
 119        /*
 120         * Keypad event
 121         * First and second data bytes list currently pressed keys,
 122         * 0x00 means no key and at most 2 keys may be pressed at same time
 123         */
 124        int i, j;
 125
 126        /* determine newly pressed keys */
 127        for (i = 0; i < size; i++) {
 128                unsigned int key_code;
 129                if (raw_data[i] == 0)
 130                        continue;
 131                for (j = 0; j < sizeof(data->pressed_keys); j++)
 132                        if (data->pressed_keys[j] == raw_data[i])
 133                                goto key_already_down;
 134                for (j = 0; j < sizeof(data->pressed_keys); j++)
 135                        if (data->pressed_keys[j] == 0) {
 136                                data->pressed_keys[j] = raw_data[i];
 137                                break;
 138                        }
 139                input_event(data->input_keys, EV_MSC, MSC_SCAN, raw_data[i]);
 140                if (raw_data[i] < PICOLCD_KEYS)
 141                        key_code = data->keycode[raw_data[i]];
 142                else
 143                        key_code = KEY_UNKNOWN;
 144                if (key_code != KEY_UNKNOWN) {
 145                        dbg_hid(PICOLCD_NAME " got key press for %u:%d",
 146                                        raw_data[i], key_code);
 147                        input_report_key(data->input_keys, key_code, 1);
 148                }
 149                input_sync(data->input_keys);
 150key_already_down:
 151                continue;
 152        }
 153
 154        /* determine newly released keys */
 155        for (j = 0; j < sizeof(data->pressed_keys); j++) {
 156                unsigned int key_code;
 157                if (data->pressed_keys[j] == 0)
 158                        continue;
 159                for (i = 0; i < size; i++)
 160                        if (data->pressed_keys[j] == raw_data[i])
 161                                goto key_still_down;
 162                input_event(data->input_keys, EV_MSC, MSC_SCAN, data->pressed_keys[j]);
 163                if (data->pressed_keys[j] < PICOLCD_KEYS)
 164                        key_code = data->keycode[data->pressed_keys[j]];
 165                else
 166                        key_code = KEY_UNKNOWN;
 167                if (key_code != KEY_UNKNOWN) {
 168                        dbg_hid(PICOLCD_NAME " got key release for %u:%d",
 169                                        data->pressed_keys[j], key_code);
 170                        input_report_key(data->input_keys, key_code, 0);
 171                }
 172                input_sync(data->input_keys);
 173                data->pressed_keys[j] = 0;
 174key_still_down:
 175                continue;
 176        }
 177        return 1;
 178}
 179
 180static int picolcd_check_version(struct hid_device *hdev)
 181{
 182        struct picolcd_data *data = hid_get_drvdata(hdev);
 183        struct picolcd_pending *verinfo;
 184        int ret = 0;
 185
 186        if (!data)
 187                return -ENODEV;
 188
 189        verinfo = picolcd_send_and_wait(hdev, REPORT_VERSION, NULL, 0);
 190        if (!verinfo) {
 191                hid_err(hdev, "no version response from PicoLCD\n");
 192                return -ENODEV;
 193        }
 194
 195        if (verinfo->raw_size == 2) {
 196                data->version[0] = verinfo->raw_data[1];
 197                data->version[1] = verinfo->raw_data[0];
 198                if (data->status & PICOLCD_BOOTLOADER) {
 199                        hid_info(hdev, "PicoLCD, bootloader version %d.%d\n",
 200                                 verinfo->raw_data[1], verinfo->raw_data[0]);
 201                } else {
 202                        hid_info(hdev, "PicoLCD, firmware version %d.%d\n",
 203                                 verinfo->raw_data[1], verinfo->raw_data[0]);
 204                }
 205        } else {
 206                hid_err(hdev, "confused, got unexpected version response from PicoLCD\n");
 207                ret = -EINVAL;
 208        }
 209        kfree(verinfo);
 210        return ret;
 211}
 212
 213/*
 214 * Reset our device and wait for answer to VERSION request
 215 */
 216int picolcd_reset(struct hid_device *hdev)
 217{
 218        struct picolcd_data *data = hid_get_drvdata(hdev);
 219        struct hid_report *report = picolcd_out_report(REPORT_RESET, hdev);
 220        unsigned long flags;
 221        int error;
 222
 223        if (!data || !report || report->maxfield != 1)
 224                return -ENODEV;
 225
 226        spin_lock_irqsave(&data->lock, flags);
 227        if (hdev->product == USB_DEVICE_ID_PICOLCD_BOOTLOADER)
 228                data->status |= PICOLCD_BOOTLOADER;
 229
 230        /* perform the reset */
 231        hid_set_field(report->field[0], 0, 1);
 232        if (data->status & PICOLCD_FAILED) {
 233                spin_unlock_irqrestore(&data->lock, flags);
 234                return -ENODEV;
 235        }
 236        hid_hw_request(hdev, report, HID_REQ_SET_REPORT);
 237        spin_unlock_irqrestore(&data->lock, flags);
 238
 239        error = picolcd_check_version(hdev);
 240        if (error)
 241                return error;
 242
 243        picolcd_resume_lcd(data);
 244        picolcd_resume_backlight(data);
 245        picolcd_fb_refresh(data);
 246        picolcd_leds_set(data);
 247        return 0;
 248}
 249
 250/*
 251 * The "operation_mode" sysfs attribute
 252 */
 253static ssize_t picolcd_operation_mode_show(struct device *dev,
 254                struct device_attribute *attr, char *buf)
 255{
 256        struct picolcd_data *data = dev_get_drvdata(dev);
 257
 258        if (data->status & PICOLCD_BOOTLOADER)
 259                return snprintf(buf, PAGE_SIZE, "[bootloader] lcd\n");
 260        else
 261                return snprintf(buf, PAGE_SIZE, "bootloader [lcd]\n");
 262}
 263
 264static ssize_t picolcd_operation_mode_store(struct device *dev,
 265                struct device_attribute *attr, const char *buf, size_t count)
 266{
 267        struct picolcd_data *data = dev_get_drvdata(dev);
 268        struct hid_report *report = NULL;
 269        int timeout = data->opmode_delay;
 270        unsigned long flags;
 271
 272        if (sysfs_streq(buf, "lcd")) {
 273                if (data->status & PICOLCD_BOOTLOADER)
 274                        report = picolcd_out_report(REPORT_EXIT_FLASHER, data->hdev);
 275        } else if (sysfs_streq(buf, "bootloader")) {
 276                if (!(data->status & PICOLCD_BOOTLOADER))
 277                        report = picolcd_out_report(REPORT_EXIT_KEYBOARD, data->hdev);
 278        } else {
 279                return -EINVAL;
 280        }
 281
 282        if (!report || report->maxfield != 1)
 283                return -EINVAL;
 284
 285        spin_lock_irqsave(&data->lock, flags);
 286        hid_set_field(report->field[0], 0, timeout & 0xff);
 287        hid_set_field(report->field[0], 1, (timeout >> 8) & 0xff);
 288        hid_hw_request(data->hdev, report, HID_REQ_SET_REPORT);
 289        spin_unlock_irqrestore(&data->lock, flags);
 290        return count;
 291}
 292
 293static DEVICE_ATTR(operation_mode, 0644, picolcd_operation_mode_show,
 294                picolcd_operation_mode_store);
 295
 296/*
 297 * The "operation_mode_delay" sysfs attribute
 298 */
 299static ssize_t picolcd_operation_mode_delay_show(struct device *dev,
 300                struct device_attribute *attr, char *buf)
 301{
 302        struct picolcd_data *data = dev_get_drvdata(dev);
 303
 304        return snprintf(buf, PAGE_SIZE, "%hu\n", data->opmode_delay);
 305}
 306
 307static ssize_t picolcd_operation_mode_delay_store(struct device *dev,
 308                struct device_attribute *attr, const char *buf, size_t count)
 309{
 310        struct picolcd_data *data = dev_get_drvdata(dev);
 311        unsigned u;
 312        if (sscanf(buf, "%u", &u) != 1)
 313                return -EINVAL;
 314        if (u > 30000)
 315                return -EINVAL;
 316        else
 317                data->opmode_delay = u;
 318        return count;
 319}
 320
 321static DEVICE_ATTR(operation_mode_delay, 0644, picolcd_operation_mode_delay_show,
 322                picolcd_operation_mode_delay_store);
 323
 324/*
 325 * Handle raw report as sent by device
 326 */
 327static int picolcd_raw_event(struct hid_device *hdev,
 328                struct hid_report *report, u8 *raw_data, int size)
 329{
 330        struct picolcd_data *data = hid_get_drvdata(hdev);
 331        unsigned long flags;
 332        int ret = 0;
 333
 334        if (!data)
 335                return 1;
 336
 337        if (size > 64) {
 338                hid_warn(hdev, "invalid size value (%d) for picolcd raw event (%d)\n",
 339                                size, report->id);
 340                return 0;
 341        }
 342
 343        if (report->id == REPORT_KEY_STATE) {
 344                if (data->input_keys)
 345                        ret = picolcd_raw_keypad(data, report, raw_data+1, size-1);
 346        } else if (report->id == REPORT_IR_DATA) {
 347                ret = picolcd_raw_cir(data, report, raw_data+1, size-1);
 348        } else {
 349                spin_lock_irqsave(&data->lock, flags);
 350                /*
 351                 * We let the caller of picolcd_send_and_wait() check if the
 352                 * report we got is one of the expected ones or not.
 353                 */
 354                if (data->pending) {
 355                        memcpy(data->pending->raw_data, raw_data+1, size-1);
 356                        data->pending->raw_size  = size-1;
 357                        data->pending->in_report = report;
 358                        complete(&data->pending->ready);
 359                }
 360                spin_unlock_irqrestore(&data->lock, flags);
 361        }
 362
 363        picolcd_debug_raw_event(data, hdev, report, raw_data, size);
 364        return 1;
 365}
 366
 367#ifdef CONFIG_PM
 368static int picolcd_suspend(struct hid_device *hdev, pm_message_t message)
 369{
 370        if (PMSG_IS_AUTO(message))
 371                return 0;
 372
 373        picolcd_suspend_backlight(hid_get_drvdata(hdev));
 374        dbg_hid(PICOLCD_NAME " device ready for suspend\n");
 375        return 0;
 376}
 377
 378static int picolcd_resume(struct hid_device *hdev)
 379{
 380        int ret;
 381        ret = picolcd_resume_backlight(hid_get_drvdata(hdev));
 382        if (ret)
 383                dbg_hid(PICOLCD_NAME " restoring backlight failed: %d\n", ret);
 384        return 0;
 385}
 386
 387static int picolcd_reset_resume(struct hid_device *hdev)
 388{
 389        int ret;
 390        ret = picolcd_reset(hdev);
 391        if (ret)
 392                dbg_hid(PICOLCD_NAME " resetting our device failed: %d\n", ret);
 393        ret = picolcd_fb_reset(hid_get_drvdata(hdev), 0);
 394        if (ret)
 395                dbg_hid(PICOLCD_NAME " restoring framebuffer content failed: %d\n", ret);
 396        ret = picolcd_resume_lcd(hid_get_drvdata(hdev));
 397        if (ret)
 398                dbg_hid(PICOLCD_NAME " restoring lcd failed: %d\n", ret);
 399        ret = picolcd_resume_backlight(hid_get_drvdata(hdev));
 400        if (ret)
 401                dbg_hid(PICOLCD_NAME " restoring backlight failed: %d\n", ret);
 402        picolcd_leds_set(hid_get_drvdata(hdev));
 403        return 0;
 404}
 405#endif
 406
 407/* initialize keypad input device */
 408static int picolcd_init_keys(struct picolcd_data *data,
 409                struct hid_report *report)
 410{
 411        struct hid_device *hdev = data->hdev;
 412        struct input_dev *idev;
 413        int error, i;
 414
 415        if (!report)
 416                return -ENODEV;
 417        if (report->maxfield != 1 || report->field[0]->report_count != 2 ||
 418                        report->field[0]->report_size != 8) {
 419                hid_err(hdev, "unsupported KEY_STATE report\n");
 420                return -EINVAL;
 421        }
 422
 423        idev = input_allocate_device();
 424        if (idev == NULL) {
 425                hid_err(hdev, "failed to allocate input device\n");
 426                return -ENOMEM;
 427        }
 428        input_set_drvdata(idev, hdev);
 429        memcpy(data->keycode, def_keymap, sizeof(def_keymap));
 430        idev->name = hdev->name;
 431        idev->phys = hdev->phys;
 432        idev->uniq = hdev->uniq;
 433        idev->id.bustype = hdev->bus;
 434        idev->id.vendor  = hdev->vendor;
 435        idev->id.product = hdev->product;
 436        idev->id.version = hdev->version;
 437        idev->dev.parent = &hdev->dev;
 438        idev->keycode     = &data->keycode;
 439        idev->keycodemax  = PICOLCD_KEYS;
 440        idev->keycodesize = sizeof(data->keycode[0]);
 441        input_set_capability(idev, EV_MSC, MSC_SCAN);
 442        set_bit(EV_REP, idev->evbit);
 443        for (i = 0; i < PICOLCD_KEYS; i++)
 444                input_set_capability(idev, EV_KEY, data->keycode[i]);
 445        error = input_register_device(idev);
 446        if (error) {
 447                hid_err(hdev, "error registering the input device\n");
 448                input_free_device(idev);
 449                return error;
 450        }
 451        data->input_keys = idev;
 452        return 0;
 453}
 454
 455static void picolcd_exit_keys(struct picolcd_data *data)
 456{
 457        struct input_dev *idev = data->input_keys;
 458
 459        data->input_keys = NULL;
 460        if (idev)
 461                input_unregister_device(idev);
 462}
 463
 464static int picolcd_probe_lcd(struct hid_device *hdev, struct picolcd_data *data)
 465{
 466        int error;
 467
 468        /* Setup keypad input device */
 469        error = picolcd_init_keys(data, picolcd_in_report(REPORT_KEY_STATE, hdev));
 470        if (error)
 471                goto err;
 472
 473        /* Setup CIR input device */
 474        error = picolcd_init_cir(data, picolcd_in_report(REPORT_IR_DATA, hdev));
 475        if (error)
 476                goto err;
 477
 478        /* Set up the framebuffer device */
 479        error = picolcd_init_framebuffer(data);
 480        if (error)
 481                goto err;
 482
 483        /* Setup lcd class device */
 484        error = picolcd_init_lcd(data, picolcd_out_report(REPORT_CONTRAST, hdev));
 485        if (error)
 486                goto err;
 487
 488        /* Setup backlight class device */
 489        error = picolcd_init_backlight(data, picolcd_out_report(REPORT_BRIGHTNESS, hdev));
 490        if (error)
 491                goto err;
 492
 493        /* Setup the LED class devices */
 494        error = picolcd_init_leds(data, picolcd_out_report(REPORT_LED_STATE, hdev));
 495        if (error)
 496                goto err;
 497
 498        picolcd_init_devfs(data, picolcd_out_report(REPORT_EE_READ, hdev),
 499                        picolcd_out_report(REPORT_EE_WRITE, hdev),
 500                        picolcd_out_report(REPORT_READ_MEMORY, hdev),
 501                        picolcd_out_report(REPORT_WRITE_MEMORY, hdev),
 502                        picolcd_out_report(REPORT_RESET, hdev));
 503        return 0;
 504err:
 505        picolcd_exit_leds(data);
 506        picolcd_exit_backlight(data);
 507        picolcd_exit_lcd(data);
 508        picolcd_exit_framebuffer(data);
 509        picolcd_exit_cir(data);
 510        picolcd_exit_keys(data);
 511        return error;
 512}
 513
 514static int picolcd_probe_bootloader(struct hid_device *hdev, struct picolcd_data *data)
 515{
 516        picolcd_init_devfs(data, NULL, NULL,
 517                        picolcd_out_report(REPORT_BL_READ_MEMORY, hdev),
 518                        picolcd_out_report(REPORT_BL_WRITE_MEMORY, hdev), NULL);
 519        return 0;
 520}
 521
 522static int picolcd_probe(struct hid_device *hdev,
 523                     const struct hid_device_id *id)
 524{
 525        struct picolcd_data *data;
 526        int error = -ENOMEM;
 527
 528        dbg_hid(PICOLCD_NAME " hardware probe...\n");
 529
 530        /*
 531         * Let's allocate the picolcd data structure, set some reasonable
 532         * defaults, and associate it with the device
 533         */
 534        data = kzalloc(sizeof(struct picolcd_data), GFP_KERNEL);
 535        if (data == NULL) {
 536                hid_err(hdev, "can't allocate space for Minibox PicoLCD device data\n");
 537                return -ENOMEM;
 538        }
 539
 540        spin_lock_init(&data->lock);
 541        mutex_init(&data->mutex);
 542        data->hdev = hdev;
 543        data->opmode_delay = 5000;
 544        if (hdev->product == USB_DEVICE_ID_PICOLCD_BOOTLOADER)
 545                data->status |= PICOLCD_BOOTLOADER;
 546        hid_set_drvdata(hdev, data);
 547
 548        /* Parse the device reports and start it up */
 549        error = hid_parse(hdev);
 550        if (error) {
 551                hid_err(hdev, "device report parse failed\n");
 552                goto err_cleanup_data;
 553        }
 554
 555        error = hid_hw_start(hdev, 0);
 556        if (error) {
 557                hid_err(hdev, "hardware start failed\n");
 558                goto err_cleanup_data;
 559        }
 560
 561        error = hid_hw_open(hdev);
 562        if (error) {
 563                hid_err(hdev, "failed to open input interrupt pipe for key and IR events\n");
 564                goto err_cleanup_hid_hw;
 565        }
 566
 567        error = device_create_file(&hdev->dev, &dev_attr_operation_mode_delay);
 568        if (error) {
 569                hid_err(hdev, "failed to create sysfs attributes\n");
 570                goto err_cleanup_hid_ll;
 571        }
 572
 573        error = device_create_file(&hdev->dev, &dev_attr_operation_mode);
 574        if (error) {
 575                hid_err(hdev, "failed to create sysfs attributes\n");
 576                goto err_cleanup_sysfs1;
 577        }
 578
 579        if (data->status & PICOLCD_BOOTLOADER)
 580                error = picolcd_probe_bootloader(hdev, data);
 581        else
 582                error = picolcd_probe_lcd(hdev, data);
 583        if (error)
 584                goto err_cleanup_sysfs2;
 585
 586        dbg_hid(PICOLCD_NAME " activated and initialized\n");
 587        return 0;
 588
 589err_cleanup_sysfs2:
 590        device_remove_file(&hdev->dev, &dev_attr_operation_mode);
 591err_cleanup_sysfs1:
 592        device_remove_file(&hdev->dev, &dev_attr_operation_mode_delay);
 593err_cleanup_hid_ll:
 594        hid_hw_close(hdev);
 595err_cleanup_hid_hw:
 596        hid_hw_stop(hdev);
 597err_cleanup_data:
 598        kfree(data);
 599        return error;
 600}
 601
 602static void picolcd_remove(struct hid_device *hdev)
 603{
 604        struct picolcd_data *data = hid_get_drvdata(hdev);
 605        unsigned long flags;
 606
 607        dbg_hid(PICOLCD_NAME " hardware remove...\n");
 608        spin_lock_irqsave(&data->lock, flags);
 609        data->status |= PICOLCD_FAILED;
 610        spin_unlock_irqrestore(&data->lock, flags);
 611
 612        picolcd_exit_devfs(data);
 613        device_remove_file(&hdev->dev, &dev_attr_operation_mode);
 614        device_remove_file(&hdev->dev, &dev_attr_operation_mode_delay);
 615        hid_hw_close(hdev);
 616        hid_hw_stop(hdev);
 617
 618        /* Shortcut potential pending reply that will never arrive */
 619        spin_lock_irqsave(&data->lock, flags);
 620        if (data->pending)
 621                complete(&data->pending->ready);
 622        spin_unlock_irqrestore(&data->lock, flags);
 623
 624        /* Cleanup LED */
 625        picolcd_exit_leds(data);
 626        /* Clean up the framebuffer */
 627        picolcd_exit_backlight(data);
 628        picolcd_exit_lcd(data);
 629        picolcd_exit_framebuffer(data);
 630        /* Cleanup input */
 631        picolcd_exit_cir(data);
 632        picolcd_exit_keys(data);
 633
 634        mutex_destroy(&data->mutex);
 635        /* Finally, clean up the picolcd data itself */
 636        kfree(data);
 637}
 638
 639static const struct hid_device_id picolcd_devices[] = {
 640        { HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICOLCD) },
 641        { HID_USB_DEVICE(USB_VENDOR_ID_MICROCHIP, USB_DEVICE_ID_PICOLCD_BOOTLOADER) },
 642        { }
 643};
 644MODULE_DEVICE_TABLE(hid, picolcd_devices);
 645
 646static struct hid_driver picolcd_driver = {
 647        .name =          "hid-picolcd",
 648        .id_table =      picolcd_devices,
 649        .probe =         picolcd_probe,
 650        .remove =        picolcd_remove,
 651        .raw_event =     picolcd_raw_event,
 652#ifdef CONFIG_PM
 653        .suspend =       picolcd_suspend,
 654        .resume =        picolcd_resume,
 655        .reset_resume =  picolcd_reset_resume,
 656#endif
 657};
 658module_hid_driver(picolcd_driver);
 659
 660MODULE_DESCRIPTION("Minibox graphics PicoLCD Driver");
 661MODULE_LICENSE("GPL v2");
 662