linux/net/bluetooth/hidp/core.c
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   1/*
   2   HIDP implementation for Linux Bluetooth stack (BlueZ).
   3   Copyright (C) 2003-2004 Marcel Holtmann <marcel@holtmann.org>
   4   Copyright (C) 2013 David Herrmann <dh.herrmann@gmail.com>
   5
   6   This program is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License version 2 as
   8   published by the Free Software Foundation;
   9
  10   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  11   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  12   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
  13   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
  14   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
  15   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  16   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  17   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  18
  19   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
  20   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
  21   SOFTWARE IS DISCLAIMED.
  22*/
  23
  24#include <linux/kref.h>
  25#include <linux/module.h>
  26#include <linux/file.h>
  27#include <linux/kthread.h>
  28#include <linux/hidraw.h>
  29
  30#include <net/bluetooth/bluetooth.h>
  31#include <net/bluetooth/hci_core.h>
  32#include <net/bluetooth/l2cap.h>
  33
  34#include "hidp.h"
  35
  36#define VERSION "1.2"
  37
  38static DECLARE_RWSEM(hidp_session_sem);
  39static LIST_HEAD(hidp_session_list);
  40
  41static unsigned char hidp_keycode[256] = {
  42          0,   0,   0,   0,  30,  48,  46,  32,  18,  33,  34,  35,  23,  36,
  43         37,  38,  50,  49,  24,  25,  16,  19,  31,  20,  22,  47,  17,  45,
  44         21,  44,   2,   3,   4,   5,   6,   7,   8,   9,  10,  11,  28,   1,
  45         14,  15,  57,  12,  13,  26,  27,  43,  43,  39,  40,  41,  51,  52,
  46         53,  58,  59,  60,  61,  62,  63,  64,  65,  66,  67,  68,  87,  88,
  47         99,  70, 119, 110, 102, 104, 111, 107, 109, 106, 105, 108, 103,  69,
  48         98,  55,  74,  78,  96,  79,  80,  81,  75,  76,  77,  71,  72,  73,
  49         82,  83,  86, 127, 116, 117, 183, 184, 185, 186, 187, 188, 189, 190,
  50        191, 192, 193, 194, 134, 138, 130, 132, 128, 129, 131, 137, 133, 135,
  51        136, 113, 115, 114,   0,   0,   0, 121,   0,  89,  93, 124,  92,  94,
  52         95,   0,   0,   0, 122, 123,  90,  91,  85,   0,   0,   0,   0,   0,
  53          0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  54          0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  55          0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  56          0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  57          0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,   0,
  58         29,  42,  56, 125,  97,  54, 100, 126, 164, 166, 165, 163, 161, 115,
  59        114, 113, 150, 158, 159, 128, 136, 177, 178, 176, 142, 152, 173, 140
  60};
  61
  62static unsigned char hidp_mkeyspat[] = { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01 };
  63
  64static int hidp_session_probe(struct l2cap_conn *conn,
  65                              struct l2cap_user *user);
  66static void hidp_session_remove(struct l2cap_conn *conn,
  67                                struct l2cap_user *user);
  68static int hidp_session_thread(void *arg);
  69static void hidp_session_terminate(struct hidp_session *s);
  70
  71static void hidp_copy_session(struct hidp_session *session, struct hidp_conninfo *ci)
  72{
  73        memset(ci, 0, sizeof(*ci));
  74        bacpy(&ci->bdaddr, &session->bdaddr);
  75
  76        ci->flags = session->flags;
  77        ci->state = BT_CONNECTED;
  78
  79        if (session->input) {
  80                ci->vendor  = session->input->id.vendor;
  81                ci->product = session->input->id.product;
  82                ci->version = session->input->id.version;
  83                if (session->input->name)
  84                        strlcpy(ci->name, session->input->name, 128);
  85                else
  86                        strlcpy(ci->name, "HID Boot Device", 128);
  87        } else if (session->hid) {
  88                ci->vendor  = session->hid->vendor;
  89                ci->product = session->hid->product;
  90                ci->version = session->hid->version;
  91                strlcpy(ci->name, session->hid->name, 128);
  92        }
  93}
  94
  95/* assemble skb, queue message on @transmit and wake up the session thread */
  96static int hidp_send_message(struct hidp_session *session, struct socket *sock,
  97                             struct sk_buff_head *transmit, unsigned char hdr,
  98                             const unsigned char *data, int size)
  99{
 100        struct sk_buff *skb;
 101        struct sock *sk = sock->sk;
 102
 103        BT_DBG("session %p data %p size %d", session, data, size);
 104
 105        if (atomic_read(&session->terminate))
 106                return -EIO;
 107
 108        skb = alloc_skb(size + 1, GFP_ATOMIC);
 109        if (!skb) {
 110                BT_ERR("Can't allocate memory for new frame");
 111                return -ENOMEM;
 112        }
 113
 114        *skb_put(skb, 1) = hdr;
 115        if (data && size > 0)
 116                memcpy(skb_put(skb, size), data, size);
 117
 118        skb_queue_tail(transmit, skb);
 119        wake_up_interruptible(sk_sleep(sk));
 120
 121        return 0;
 122}
 123
 124static int hidp_send_ctrl_message(struct hidp_session *session,
 125                                  unsigned char hdr, const unsigned char *data,
 126                                  int size)
 127{
 128        return hidp_send_message(session, session->ctrl_sock,
 129                                 &session->ctrl_transmit, hdr, data, size);
 130}
 131
 132static int hidp_send_intr_message(struct hidp_session *session,
 133                                  unsigned char hdr, const unsigned char *data,
 134                                  int size)
 135{
 136        return hidp_send_message(session, session->intr_sock,
 137                                 &session->intr_transmit, hdr, data, size);
 138}
 139
 140static int hidp_input_event(struct input_dev *dev, unsigned int type,
 141                            unsigned int code, int value)
 142{
 143        struct hidp_session *session = input_get_drvdata(dev);
 144        unsigned char newleds;
 145        unsigned char hdr, data[2];
 146
 147        BT_DBG("session %p type %d code %d value %d",
 148               session, type, code, value);
 149
 150        if (type != EV_LED)
 151                return -1;
 152
 153        newleds = (!!test_bit(LED_KANA,    dev->led) << 3) |
 154                  (!!test_bit(LED_COMPOSE, dev->led) << 3) |
 155                  (!!test_bit(LED_SCROLLL, dev->led) << 2) |
 156                  (!!test_bit(LED_CAPSL,   dev->led) << 1) |
 157                  (!!test_bit(LED_NUML,    dev->led));
 158
 159        if (session->leds == newleds)
 160                return 0;
 161
 162        session->leds = newleds;
 163
 164        hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
 165        data[0] = 0x01;
 166        data[1] = newleds;
 167
 168        return hidp_send_intr_message(session, hdr, data, 2);
 169}
 170
 171static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
 172{
 173        struct input_dev *dev = session->input;
 174        unsigned char *keys = session->keys;
 175        unsigned char *udata = skb->data + 1;
 176        signed char *sdata = skb->data + 1;
 177        int i, size = skb->len - 1;
 178
 179        switch (skb->data[0]) {
 180        case 0x01:      /* Keyboard report */
 181                for (i = 0; i < 8; i++)
 182                        input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
 183
 184                /* If all the key codes have been set to 0x01, it means
 185                 * too many keys were pressed at the same time. */
 186                if (!memcmp(udata + 2, hidp_mkeyspat, 6))
 187                        break;
 188
 189                for (i = 2; i < 8; i++) {
 190                        if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
 191                                if (hidp_keycode[keys[i]])
 192                                        input_report_key(dev, hidp_keycode[keys[i]], 0);
 193                                else
 194                                        BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
 195                        }
 196
 197                        if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
 198                                if (hidp_keycode[udata[i]])
 199                                        input_report_key(dev, hidp_keycode[udata[i]], 1);
 200                                else
 201                                        BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
 202                        }
 203                }
 204
 205                memcpy(keys, udata, 8);
 206                break;
 207
 208        case 0x02:      /* Mouse report */
 209                input_report_key(dev, BTN_LEFT,   sdata[0] & 0x01);
 210                input_report_key(dev, BTN_RIGHT,  sdata[0] & 0x02);
 211                input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
 212                input_report_key(dev, BTN_SIDE,   sdata[0] & 0x08);
 213                input_report_key(dev, BTN_EXTRA,  sdata[0] & 0x10);
 214
 215                input_report_rel(dev, REL_X, sdata[1]);
 216                input_report_rel(dev, REL_Y, sdata[2]);
 217
 218                if (size > 3)
 219                        input_report_rel(dev, REL_WHEEL, sdata[3]);
 220                break;
 221        }
 222
 223        input_sync(dev);
 224}
 225
 226static int hidp_send_report(struct hidp_session *session, struct hid_report *report)
 227{
 228        unsigned char hdr;
 229        u8 *buf;
 230        int rsize, ret;
 231
 232        buf = hid_alloc_report_buf(report, GFP_ATOMIC);
 233        if (!buf)
 234                return -EIO;
 235
 236        hid_output_report(report, buf);
 237        hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
 238
 239        rsize = ((report->size - 1) >> 3) + 1 + (report->id > 0);
 240        ret = hidp_send_intr_message(session, hdr, buf, rsize);
 241
 242        kfree(buf);
 243        return ret;
 244}
 245
 246static int hidp_hidinput_event(struct input_dev *dev, unsigned int type,
 247                               unsigned int code, int value)
 248{
 249        struct hid_device *hid = input_get_drvdata(dev);
 250        struct hidp_session *session = hid->driver_data;
 251        struct hid_field *field;
 252        int offset;
 253
 254        BT_DBG("session %p type %d code %d value %d",
 255               session, type, code, value);
 256
 257        if (type != EV_LED)
 258                return -1;
 259
 260        offset = hidinput_find_field(hid, type, code, &field);
 261        if (offset == -1) {
 262                hid_warn(dev, "event field not found\n");
 263                return -1;
 264        }
 265
 266        hid_set_field(field, offset, value);
 267
 268        return hidp_send_report(session, field->report);
 269}
 270
 271static int hidp_get_raw_report(struct hid_device *hid,
 272                unsigned char report_number,
 273                unsigned char *data, size_t count,
 274                unsigned char report_type)
 275{
 276        struct hidp_session *session = hid->driver_data;
 277        struct sk_buff *skb;
 278        size_t len;
 279        int numbered_reports = hid->report_enum[report_type].numbered;
 280        int ret;
 281
 282        if (atomic_read(&session->terminate))
 283                return -EIO;
 284
 285        switch (report_type) {
 286        case HID_FEATURE_REPORT:
 287                report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
 288                break;
 289        case HID_INPUT_REPORT:
 290                report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
 291                break;
 292        case HID_OUTPUT_REPORT:
 293                report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
 294                break;
 295        default:
 296                return -EINVAL;
 297        }
 298
 299        if (mutex_lock_interruptible(&session->report_mutex))
 300                return -ERESTARTSYS;
 301
 302        /* Set up our wait, and send the report request to the device. */
 303        session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
 304        session->waiting_report_number = numbered_reports ? report_number : -1;
 305        set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
 306        data[0] = report_number;
 307        ret = hidp_send_ctrl_message(session, report_type, data, 1);
 308        if (ret)
 309                goto err;
 310
 311        /* Wait for the return of the report. The returned report
 312           gets put in session->report_return.  */
 313        while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
 314               !atomic_read(&session->terminate)) {
 315                int res;
 316
 317                res = wait_event_interruptible_timeout(session->report_queue,
 318                        !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)
 319                                || atomic_read(&session->terminate),
 320                        5*HZ);
 321                if (res == 0) {
 322                        /* timeout */
 323                        ret = -EIO;
 324                        goto err;
 325                }
 326                if (res < 0) {
 327                        /* signal */
 328                        ret = -ERESTARTSYS;
 329                        goto err;
 330                }
 331        }
 332
 333        skb = session->report_return;
 334        if (skb) {
 335                len = skb->len < count ? skb->len : count;
 336                memcpy(data, skb->data, len);
 337
 338                kfree_skb(skb);
 339                session->report_return = NULL;
 340        } else {
 341                /* Device returned a HANDSHAKE, indicating  protocol error. */
 342                len = -EIO;
 343        }
 344
 345        clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
 346        mutex_unlock(&session->report_mutex);
 347
 348        return len;
 349
 350err:
 351        clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
 352        mutex_unlock(&session->report_mutex);
 353        return ret;
 354}
 355
 356static int hidp_output_raw_report(struct hid_device *hid, unsigned char *data, size_t count,
 357                unsigned char report_type)
 358{
 359        struct hidp_session *session = hid->driver_data;
 360        int ret;
 361
 362        if (report_type == HID_OUTPUT_REPORT) {
 363                report_type = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
 364                return hidp_send_intr_message(session, report_type,
 365                                              data, count);
 366        } else if (report_type != HID_FEATURE_REPORT) {
 367                return -EINVAL;
 368        }
 369
 370        if (mutex_lock_interruptible(&session->report_mutex))
 371                return -ERESTARTSYS;
 372
 373        /* Set up our wait, and send the report request to the device. */
 374        set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
 375        report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
 376        ret = hidp_send_ctrl_message(session, report_type, data, count);
 377        if (ret)
 378                goto err;
 379
 380        /* Wait for the ACK from the device. */
 381        while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) &&
 382               !atomic_read(&session->terminate)) {
 383                int res;
 384
 385                res = wait_event_interruptible_timeout(session->report_queue,
 386                        !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)
 387                                || atomic_read(&session->terminate),
 388                        10*HZ);
 389                if (res == 0) {
 390                        /* timeout */
 391                        ret = -EIO;
 392                        goto err;
 393                }
 394                if (res < 0) {
 395                        /* signal */
 396                        ret = -ERESTARTSYS;
 397                        goto err;
 398                }
 399        }
 400
 401        if (!session->output_report_success) {
 402                ret = -EIO;
 403                goto err;
 404        }
 405
 406        ret = count;
 407
 408err:
 409        clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
 410        mutex_unlock(&session->report_mutex);
 411        return ret;
 412}
 413
 414static void hidp_idle_timeout(unsigned long arg)
 415{
 416        struct hidp_session *session = (struct hidp_session *) arg;
 417
 418        hidp_session_terminate(session);
 419}
 420
 421static void hidp_set_timer(struct hidp_session *session)
 422{
 423        if (session->idle_to > 0)
 424                mod_timer(&session->timer, jiffies + HZ * session->idle_to);
 425}
 426
 427static void hidp_del_timer(struct hidp_session *session)
 428{
 429        if (session->idle_to > 0)
 430                del_timer(&session->timer);
 431}
 432
 433static void hidp_process_report(struct hidp_session *session,
 434                                int type, const u8 *data, int len, int intr)
 435{
 436        if (len > HID_MAX_BUFFER_SIZE)
 437                len = HID_MAX_BUFFER_SIZE;
 438
 439        memcpy(session->input_buf, data, len);
 440        hid_input_report(session->hid, type, session->input_buf, len, intr);
 441}
 442
 443static void hidp_process_handshake(struct hidp_session *session,
 444                                        unsigned char param)
 445{
 446        BT_DBG("session %p param 0x%02x", session, param);
 447        session->output_report_success = 0; /* default condition */
 448
 449        switch (param) {
 450        case HIDP_HSHK_SUCCESSFUL:
 451                /* FIXME: Call into SET_ GET_ handlers here */
 452                session->output_report_success = 1;
 453                break;
 454
 455        case HIDP_HSHK_NOT_READY:
 456        case HIDP_HSHK_ERR_INVALID_REPORT_ID:
 457        case HIDP_HSHK_ERR_UNSUPPORTED_REQUEST:
 458        case HIDP_HSHK_ERR_INVALID_PARAMETER:
 459                if (test_and_clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags))
 460                        wake_up_interruptible(&session->report_queue);
 461
 462                /* FIXME: Call into SET_ GET_ handlers here */
 463                break;
 464
 465        case HIDP_HSHK_ERR_UNKNOWN:
 466                break;
 467
 468        case HIDP_HSHK_ERR_FATAL:
 469                /* Device requests a reboot, as this is the only way this error
 470                 * can be recovered. */
 471                hidp_send_ctrl_message(session,
 472                        HIDP_TRANS_HID_CONTROL | HIDP_CTRL_SOFT_RESET, NULL, 0);
 473                break;
 474
 475        default:
 476                hidp_send_ctrl_message(session,
 477                        HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
 478                break;
 479        }
 480
 481        /* Wake up the waiting thread. */
 482        if (test_and_clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags))
 483                wake_up_interruptible(&session->report_queue);
 484}
 485
 486static void hidp_process_hid_control(struct hidp_session *session,
 487                                        unsigned char param)
 488{
 489        BT_DBG("session %p param 0x%02x", session, param);
 490
 491        if (param == HIDP_CTRL_VIRTUAL_CABLE_UNPLUG) {
 492                /* Flush the transmit queues */
 493                skb_queue_purge(&session->ctrl_transmit);
 494                skb_queue_purge(&session->intr_transmit);
 495
 496                hidp_session_terminate(session);
 497        }
 498}
 499
 500/* Returns true if the passed-in skb should be freed by the caller. */
 501static int hidp_process_data(struct hidp_session *session, struct sk_buff *skb,
 502                                unsigned char param)
 503{
 504        int done_with_skb = 1;
 505        BT_DBG("session %p skb %p len %d param 0x%02x", session, skb, skb->len, param);
 506
 507        switch (param) {
 508        case HIDP_DATA_RTYPE_INPUT:
 509                hidp_set_timer(session);
 510
 511                if (session->input)
 512                        hidp_input_report(session, skb);
 513
 514                if (session->hid)
 515                        hidp_process_report(session, HID_INPUT_REPORT,
 516                                            skb->data, skb->len, 0);
 517                break;
 518
 519        case HIDP_DATA_RTYPE_OTHER:
 520        case HIDP_DATA_RTYPE_OUPUT:
 521        case HIDP_DATA_RTYPE_FEATURE:
 522                break;
 523
 524        default:
 525                hidp_send_ctrl_message(session,
 526                        HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_INVALID_PARAMETER, NULL, 0);
 527        }
 528
 529        if (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
 530                                param == session->waiting_report_type) {
 531                if (session->waiting_report_number < 0 ||
 532                    session->waiting_report_number == skb->data[0]) {
 533                        /* hidp_get_raw_report() is waiting on this report. */
 534                        session->report_return = skb;
 535                        done_with_skb = 0;
 536                        clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
 537                        wake_up_interruptible(&session->report_queue);
 538                }
 539        }
 540
 541        return done_with_skb;
 542}
 543
 544static void hidp_recv_ctrl_frame(struct hidp_session *session,
 545                                        struct sk_buff *skb)
 546{
 547        unsigned char hdr, type, param;
 548        int free_skb = 1;
 549
 550        BT_DBG("session %p skb %p len %d", session, skb, skb->len);
 551
 552        hdr = skb->data[0];
 553        skb_pull(skb, 1);
 554
 555        type = hdr & HIDP_HEADER_TRANS_MASK;
 556        param = hdr & HIDP_HEADER_PARAM_MASK;
 557
 558        switch (type) {
 559        case HIDP_TRANS_HANDSHAKE:
 560                hidp_process_handshake(session, param);
 561                break;
 562
 563        case HIDP_TRANS_HID_CONTROL:
 564                hidp_process_hid_control(session, param);
 565                break;
 566
 567        case HIDP_TRANS_DATA:
 568                free_skb = hidp_process_data(session, skb, param);
 569                break;
 570
 571        default:
 572                hidp_send_ctrl_message(session,
 573                        HIDP_TRANS_HANDSHAKE | HIDP_HSHK_ERR_UNSUPPORTED_REQUEST, NULL, 0);
 574                break;
 575        }
 576
 577        if (free_skb)
 578                kfree_skb(skb);
 579}
 580
 581static void hidp_recv_intr_frame(struct hidp_session *session,
 582                                struct sk_buff *skb)
 583{
 584        unsigned char hdr;
 585
 586        BT_DBG("session %p skb %p len %d", session, skb, skb->len);
 587
 588        hdr = skb->data[0];
 589        skb_pull(skb, 1);
 590
 591        if (hdr == (HIDP_TRANS_DATA | HIDP_DATA_RTYPE_INPUT)) {
 592                hidp_set_timer(session);
 593
 594                if (session->input)
 595                        hidp_input_report(session, skb);
 596
 597                if (session->hid) {
 598                        hidp_process_report(session, HID_INPUT_REPORT,
 599                                            skb->data, skb->len, 1);
 600                        BT_DBG("report len %d", skb->len);
 601                }
 602        } else {
 603                BT_DBG("Unsupported protocol header 0x%02x", hdr);
 604        }
 605
 606        kfree_skb(skb);
 607}
 608
 609static int hidp_send_frame(struct socket *sock, unsigned char *data, int len)
 610{
 611        struct kvec iv = { data, len };
 612        struct msghdr msg;
 613
 614        BT_DBG("sock %p data %p len %d", sock, data, len);
 615
 616        if (!len)
 617                return 0;
 618
 619        memset(&msg, 0, sizeof(msg));
 620
 621        return kernel_sendmsg(sock, &msg, &iv, 1, len);
 622}
 623
 624/* dequeue message from @transmit and send via @sock */
 625static void hidp_process_transmit(struct hidp_session *session,
 626                                  struct sk_buff_head *transmit,
 627                                  struct socket *sock)
 628{
 629        struct sk_buff *skb;
 630        int ret;
 631
 632        BT_DBG("session %p", session);
 633
 634        while ((skb = skb_dequeue(transmit))) {
 635                ret = hidp_send_frame(sock, skb->data, skb->len);
 636                if (ret == -EAGAIN) {
 637                        skb_queue_head(transmit, skb);
 638                        break;
 639                } else if (ret < 0) {
 640                        hidp_session_terminate(session);
 641                        kfree_skb(skb);
 642                        break;
 643                }
 644
 645                hidp_set_timer(session);
 646                kfree_skb(skb);
 647        }
 648}
 649
 650static int hidp_setup_input(struct hidp_session *session,
 651                                struct hidp_connadd_req *req)
 652{
 653        struct input_dev *input;
 654        int i;
 655
 656        input = input_allocate_device();
 657        if (!input)
 658                return -ENOMEM;
 659
 660        session->input = input;
 661
 662        input_set_drvdata(input, session);
 663
 664        input->name = "Bluetooth HID Boot Protocol Device";
 665
 666        input->id.bustype = BUS_BLUETOOTH;
 667        input->id.vendor  = req->vendor;
 668        input->id.product = req->product;
 669        input->id.version = req->version;
 670
 671        if (req->subclass & 0x40) {
 672                set_bit(EV_KEY, input->evbit);
 673                set_bit(EV_LED, input->evbit);
 674                set_bit(EV_REP, input->evbit);
 675
 676                set_bit(LED_NUML,    input->ledbit);
 677                set_bit(LED_CAPSL,   input->ledbit);
 678                set_bit(LED_SCROLLL, input->ledbit);
 679                set_bit(LED_COMPOSE, input->ledbit);
 680                set_bit(LED_KANA,    input->ledbit);
 681
 682                for (i = 0; i < sizeof(hidp_keycode); i++)
 683                        set_bit(hidp_keycode[i], input->keybit);
 684                clear_bit(0, input->keybit);
 685        }
 686
 687        if (req->subclass & 0x80) {
 688                input->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
 689                input->keybit[BIT_WORD(BTN_MOUSE)] = BIT_MASK(BTN_LEFT) |
 690                        BIT_MASK(BTN_RIGHT) | BIT_MASK(BTN_MIDDLE);
 691                input->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
 692                input->keybit[BIT_WORD(BTN_MOUSE)] |= BIT_MASK(BTN_SIDE) |
 693                        BIT_MASK(BTN_EXTRA);
 694                input->relbit[0] |= BIT_MASK(REL_WHEEL);
 695        }
 696
 697        input->dev.parent = &session->conn->hcon->dev;
 698
 699        input->event = hidp_input_event;
 700
 701        return 0;
 702}
 703
 704static int hidp_open(struct hid_device *hid)
 705{
 706        return 0;
 707}
 708
 709static void hidp_close(struct hid_device *hid)
 710{
 711}
 712
 713static int hidp_parse(struct hid_device *hid)
 714{
 715        struct hidp_session *session = hid->driver_data;
 716
 717        return hid_parse_report(session->hid, session->rd_data,
 718                        session->rd_size);
 719}
 720
 721static int hidp_start(struct hid_device *hid)
 722{
 723        return 0;
 724}
 725
 726static void hidp_stop(struct hid_device *hid)
 727{
 728        struct hidp_session *session = hid->driver_data;
 729
 730        skb_queue_purge(&session->ctrl_transmit);
 731        skb_queue_purge(&session->intr_transmit);
 732
 733        hid->claimed = 0;
 734}
 735
 736static struct hid_ll_driver hidp_hid_driver = {
 737        .parse = hidp_parse,
 738        .start = hidp_start,
 739        .stop = hidp_stop,
 740        .open  = hidp_open,
 741        .close = hidp_close,
 742        .hidinput_input_event = hidp_hidinput_event,
 743};
 744
 745/* This function sets up the hid device. It does not add it
 746   to the HID system. That is done in hidp_add_connection(). */
 747static int hidp_setup_hid(struct hidp_session *session,
 748                                struct hidp_connadd_req *req)
 749{
 750        struct hid_device *hid;
 751        int err;
 752
 753        session->rd_data = kzalloc(req->rd_size, GFP_KERNEL);
 754        if (!session->rd_data)
 755                return -ENOMEM;
 756
 757        if (copy_from_user(session->rd_data, req->rd_data, req->rd_size)) {
 758                err = -EFAULT;
 759                goto fault;
 760        }
 761        session->rd_size = req->rd_size;
 762
 763        hid = hid_allocate_device();
 764        if (IS_ERR(hid)) {
 765                err = PTR_ERR(hid);
 766                goto fault;
 767        }
 768
 769        session->hid = hid;
 770
 771        hid->driver_data = session;
 772
 773        hid->bus     = BUS_BLUETOOTH;
 774        hid->vendor  = req->vendor;
 775        hid->product = req->product;
 776        hid->version = req->version;
 777        hid->country = req->country;
 778
 779        strncpy(hid->name, req->name, sizeof(req->name) - 1);
 780
 781        snprintf(hid->phys, sizeof(hid->phys), "%pMR",
 782                 &l2cap_pi(session->ctrl_sock->sk)->chan->src);
 783
 784        snprintf(hid->uniq, sizeof(hid->uniq), "%pMR",
 785                 &l2cap_pi(session->ctrl_sock->sk)->chan->dst);
 786
 787        hid->dev.parent = &session->conn->hcon->dev;
 788        hid->ll_driver = &hidp_hid_driver;
 789
 790        hid->hid_get_raw_report = hidp_get_raw_report;
 791        hid->hid_output_raw_report = hidp_output_raw_report;
 792
 793        /* True if device is blacklisted in drivers/hid/hid-core.c */
 794        if (hid_ignore(hid)) {
 795                hid_destroy_device(session->hid);
 796                session->hid = NULL;
 797                return -ENODEV;
 798        }
 799
 800        return 0;
 801
 802fault:
 803        kfree(session->rd_data);
 804        session->rd_data = NULL;
 805
 806        return err;
 807}
 808
 809/* initialize session devices */
 810static int hidp_session_dev_init(struct hidp_session *session,
 811                                 struct hidp_connadd_req *req)
 812{
 813        int ret;
 814
 815        if (req->rd_size > 0) {
 816                ret = hidp_setup_hid(session, req);
 817                if (ret && ret != -ENODEV)
 818                        return ret;
 819        }
 820
 821        if (!session->hid) {
 822                ret = hidp_setup_input(session, req);
 823                if (ret < 0)
 824                        return ret;
 825        }
 826
 827        return 0;
 828}
 829
 830/* destroy session devices */
 831static void hidp_session_dev_destroy(struct hidp_session *session)
 832{
 833        if (session->hid)
 834                put_device(&session->hid->dev);
 835        else if (session->input)
 836                input_put_device(session->input);
 837
 838        kfree(session->rd_data);
 839        session->rd_data = NULL;
 840}
 841
 842/* add HID/input devices to their underlying bus systems */
 843static int hidp_session_dev_add(struct hidp_session *session)
 844{
 845        int ret;
 846
 847        /* Both HID and input systems drop a ref-count when unregistering the
 848         * device but they don't take a ref-count when registering them. Work
 849         * around this by explicitly taking a refcount during registration
 850         * which is dropped automatically by unregistering the devices. */
 851
 852        if (session->hid) {
 853                ret = hid_add_device(session->hid);
 854                if (ret)
 855                        return ret;
 856                get_device(&session->hid->dev);
 857        } else if (session->input) {
 858                ret = input_register_device(session->input);
 859                if (ret)
 860                        return ret;
 861                input_get_device(session->input);
 862        }
 863
 864        return 0;
 865}
 866
 867/* remove HID/input devices from their bus systems */
 868static void hidp_session_dev_del(struct hidp_session *session)
 869{
 870        if (session->hid)
 871                hid_destroy_device(session->hid);
 872        else if (session->input)
 873                input_unregister_device(session->input);
 874}
 875
 876/*
 877 * Asynchronous device registration
 878 * HID device drivers might want to perform I/O during initialization to
 879 * detect device types. Therefore, call device registration in a separate
 880 * worker so the HIDP thread can schedule I/O operations.
 881 * Note that this must be called after the worker thread was initialized
 882 * successfully. This will then add the devices and increase session state
 883 * on success, otherwise it will terminate the session thread.
 884 */
 885static void hidp_session_dev_work(struct work_struct *work)
 886{
 887        struct hidp_session *session = container_of(work,
 888                                                    struct hidp_session,
 889                                                    dev_init);
 890        int ret;
 891
 892        ret = hidp_session_dev_add(session);
 893        if (!ret)
 894                atomic_inc(&session->state);
 895        else
 896                hidp_session_terminate(session);
 897}
 898
 899/*
 900 * Create new session object
 901 * Allocate session object, initialize static fields, copy input data into the
 902 * object and take a reference to all sub-objects.
 903 * This returns 0 on success and puts a pointer to the new session object in
 904 * \out. Otherwise, an error code is returned.
 905 * The new session object has an initial ref-count of 1.
 906 */
 907static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
 908                            struct socket *ctrl_sock,
 909                            struct socket *intr_sock,
 910                            struct hidp_connadd_req *req,
 911                            struct l2cap_conn *conn)
 912{
 913        struct hidp_session *session;
 914        int ret;
 915        struct bt_sock *ctrl, *intr;
 916
 917        ctrl = bt_sk(ctrl_sock->sk);
 918        intr = bt_sk(intr_sock->sk);
 919
 920        session = kzalloc(sizeof(*session), GFP_KERNEL);
 921        if (!session)
 922                return -ENOMEM;
 923
 924        /* object and runtime management */
 925        kref_init(&session->ref);
 926        atomic_set(&session->state, HIDP_SESSION_IDLING);
 927        init_waitqueue_head(&session->state_queue);
 928        session->flags = req->flags & (1 << HIDP_BLUETOOTH_VENDOR_ID);
 929
 930        /* connection management */
 931        bacpy(&session->bdaddr, bdaddr);
 932        session->conn = conn;
 933        session->user.probe = hidp_session_probe;
 934        session->user.remove = hidp_session_remove;
 935        session->ctrl_sock = ctrl_sock;
 936        session->intr_sock = intr_sock;
 937        skb_queue_head_init(&session->ctrl_transmit);
 938        skb_queue_head_init(&session->intr_transmit);
 939        session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu,
 940                                        l2cap_pi(ctrl)->chan->imtu);
 941        session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu,
 942                                        l2cap_pi(intr)->chan->imtu);
 943        session->idle_to = req->idle_to;
 944
 945        /* device management */
 946        INIT_WORK(&session->dev_init, hidp_session_dev_work);
 947        setup_timer(&session->timer, hidp_idle_timeout,
 948                    (unsigned long)session);
 949
 950        /* session data */
 951        mutex_init(&session->report_mutex);
 952        init_waitqueue_head(&session->report_queue);
 953
 954        ret = hidp_session_dev_init(session, req);
 955        if (ret)
 956                goto err_free;
 957
 958        l2cap_conn_get(session->conn);
 959        get_file(session->intr_sock->file);
 960        get_file(session->ctrl_sock->file);
 961        *out = session;
 962        return 0;
 963
 964err_free:
 965        kfree(session);
 966        return ret;
 967}
 968
 969/* increase ref-count of the given session by one */
 970static void hidp_session_get(struct hidp_session *session)
 971{
 972        kref_get(&session->ref);
 973}
 974
 975/* release callback */
 976static void session_free(struct kref *ref)
 977{
 978        struct hidp_session *session = container_of(ref, struct hidp_session,
 979                                                    ref);
 980
 981        hidp_session_dev_destroy(session);
 982        skb_queue_purge(&session->ctrl_transmit);
 983        skb_queue_purge(&session->intr_transmit);
 984        fput(session->intr_sock->file);
 985        fput(session->ctrl_sock->file);
 986        l2cap_conn_put(session->conn);
 987        kfree(session);
 988}
 989
 990/* decrease ref-count of the given session by one */
 991static void hidp_session_put(struct hidp_session *session)
 992{
 993        kref_put(&session->ref, session_free);
 994}
 995
 996/*
 997 * Search the list of active sessions for a session with target address
 998 * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as
 999 * you do not release this lock, the session objects cannot vanish and you can
1000 * safely take a reference to the session yourself.
1001 */
1002static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr)
1003{
1004        struct hidp_session *session;
1005
1006        list_for_each_entry(session, &hidp_session_list, list) {
1007                if (!bacmp(bdaddr, &session->bdaddr))
1008                        return session;
1009        }
1010
1011        return NULL;
1012}
1013
1014/*
1015 * Same as __hidp_session_find() but no locks must be held. This also takes a
1016 * reference of the returned session (if non-NULL) so you must drop this
1017 * reference if you no longer use the object.
1018 */
1019static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr)
1020{
1021        struct hidp_session *session;
1022
1023        down_read(&hidp_session_sem);
1024
1025        session = __hidp_session_find(bdaddr);
1026        if (session)
1027                hidp_session_get(session);
1028
1029        up_read(&hidp_session_sem);
1030
1031        return session;
1032}
1033
1034/*
1035 * Start session synchronously
1036 * This starts a session thread and waits until initialization
1037 * is done or returns an error if it couldn't be started.
1038 * If this returns 0 the session thread is up and running. You must call
1039 * hipd_session_stop_sync() before deleting any runtime resources.
1040 */
1041static int hidp_session_start_sync(struct hidp_session *session)
1042{
1043        unsigned int vendor, product;
1044
1045        if (session->hid) {
1046                vendor  = session->hid->vendor;
1047                product = session->hid->product;
1048        } else if (session->input) {
1049                vendor  = session->input->id.vendor;
1050                product = session->input->id.product;
1051        } else {
1052                vendor = 0x0000;
1053                product = 0x0000;
1054        }
1055
1056        session->task = kthread_run(hidp_session_thread, session,
1057                                    "khidpd_%04x%04x", vendor, product);
1058        if (IS_ERR(session->task))
1059                return PTR_ERR(session->task);
1060
1061        while (atomic_read(&session->state) <= HIDP_SESSION_IDLING)
1062                wait_event(session->state_queue,
1063                           atomic_read(&session->state) > HIDP_SESSION_IDLING);
1064
1065        return 0;
1066}
1067
1068/*
1069 * Terminate session thread
1070 * Wake up session thread and notify it to stop. This is asynchronous and
1071 * returns immediately. Call this whenever a runtime error occurs and you want
1072 * the session to stop.
1073 * Note: wake_up_process() performs any necessary memory-barriers for us.
1074 */
1075static void hidp_session_terminate(struct hidp_session *session)
1076{
1077        atomic_inc(&session->terminate);
1078        wake_up_process(session->task);
1079}
1080
1081/*
1082 * Probe HIDP session
1083 * This is called from the l2cap_conn core when our l2cap_user object is bound
1084 * to the hci-connection. We get the session via the \user object and can now
1085 * start the session thread, link it into the global session list and
1086 * schedule HID/input device registration.
1087 * The global session-list owns its own reference to the session object so you
1088 * can drop your own reference after registering the l2cap_user object.
1089 */
1090static int hidp_session_probe(struct l2cap_conn *conn,
1091                              struct l2cap_user *user)
1092{
1093        struct hidp_session *session = container_of(user,
1094                                                    struct hidp_session,
1095                                                    user);
1096        struct hidp_session *s;
1097        int ret;
1098
1099        down_write(&hidp_session_sem);
1100
1101        /* check that no other session for this device exists */
1102        s = __hidp_session_find(&session->bdaddr);
1103        if (s) {
1104                ret = -EEXIST;
1105                goto out_unlock;
1106        }
1107
1108        if (session->input) {
1109                ret = hidp_session_dev_add(session);
1110                if (ret)
1111                        goto out_unlock;
1112        }
1113
1114        ret = hidp_session_start_sync(session);
1115        if (ret)
1116                goto out_del;
1117
1118        /* HID device registration is async to allow I/O during probe */
1119        if (session->input)
1120                atomic_inc(&session->state);
1121        else
1122                schedule_work(&session->dev_init);
1123
1124        hidp_session_get(session);
1125        list_add(&session->list, &hidp_session_list);
1126        ret = 0;
1127        goto out_unlock;
1128
1129out_del:
1130        if (session->input)
1131                hidp_session_dev_del(session);
1132out_unlock:
1133        up_write(&hidp_session_sem);
1134        return ret;
1135}
1136
1137/*
1138 * Remove HIDP session
1139 * Called from the l2cap_conn core when either we explicitly unregistered
1140 * the l2cap_user object or if the underlying connection is shut down.
1141 * We signal the hidp-session thread to shut down, unregister the HID/input
1142 * devices and unlink the session from the global list.
1143 * This drops the reference to the session that is owned by the global
1144 * session-list.
1145 * Note: We _must_ not synchronosly wait for the session-thread to shut down.
1146 * This is, because the session-thread might be waiting for an HCI lock that is
1147 * held while we are called. Therefore, we only unregister the devices and
1148 * notify the session-thread to terminate. The thread itself owns a reference
1149 * to the session object so it can safely shut down.
1150 */
1151static void hidp_session_remove(struct l2cap_conn *conn,
1152                                struct l2cap_user *user)
1153{
1154        struct hidp_session *session = container_of(user,
1155                                                    struct hidp_session,
1156                                                    user);
1157
1158        down_write(&hidp_session_sem);
1159
1160        hidp_session_terminate(session);
1161
1162        cancel_work_sync(&session->dev_init);
1163        if (session->input ||
1164            atomic_read(&session->state) > HIDP_SESSION_PREPARING)
1165                hidp_session_dev_del(session);
1166
1167        list_del(&session->list);
1168
1169        up_write(&hidp_session_sem);
1170
1171        hidp_session_put(session);
1172}
1173
1174/*
1175 * Session Worker
1176 * This performs the actual main-loop of the HIDP worker. We first check
1177 * whether the underlying connection is still alive, then parse all pending
1178 * messages and finally send all outstanding messages.
1179 */
1180static void hidp_session_run(struct hidp_session *session)
1181{
1182        struct sock *ctrl_sk = session->ctrl_sock->sk;
1183        struct sock *intr_sk = session->intr_sock->sk;
1184        struct sk_buff *skb;
1185
1186        for (;;) {
1187                /*
1188                 * This thread can be woken up two ways:
1189                 *  - You call hidp_session_terminate() which sets the
1190                 *    session->terminate flag and wakes this thread up.
1191                 *  - Via modifying the socket state of ctrl/intr_sock. This
1192                 *    thread is woken up by ->sk_state_changed().
1193                 *
1194                 * Note: set_current_state() performs any necessary
1195                 * memory-barriers for us.
1196                 */
1197                set_current_state(TASK_INTERRUPTIBLE);
1198
1199                if (atomic_read(&session->terminate))
1200                        break;
1201
1202                if (ctrl_sk->sk_state != BT_CONNECTED ||
1203                    intr_sk->sk_state != BT_CONNECTED)
1204                        break;
1205
1206                /* parse incoming intr-skbs */
1207                while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
1208                        skb_orphan(skb);
1209                        if (!skb_linearize(skb))
1210                                hidp_recv_intr_frame(session, skb);
1211                        else
1212                                kfree_skb(skb);
1213                }
1214
1215                /* send pending intr-skbs */
1216                hidp_process_transmit(session, &session->intr_transmit,
1217                                      session->intr_sock);
1218
1219                /* parse incoming ctrl-skbs */
1220                while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
1221                        skb_orphan(skb);
1222                        if (!skb_linearize(skb))
1223                                hidp_recv_ctrl_frame(session, skb);
1224                        else
1225                                kfree_skb(skb);
1226                }
1227
1228                /* send pending ctrl-skbs */
1229                hidp_process_transmit(session, &session->ctrl_transmit,
1230                                      session->ctrl_sock);
1231
1232                schedule();
1233        }
1234
1235        atomic_inc(&session->terminate);
1236        set_current_state(TASK_RUNNING);
1237}
1238
1239/*
1240 * HIDP session thread
1241 * This thread runs the I/O for a single HIDP session. Startup is synchronous
1242 * which allows us to take references to ourself here instead of doing that in
1243 * the caller.
1244 * When we are ready to run we notify the caller and call hidp_session_run().
1245 */
1246static int hidp_session_thread(void *arg)
1247{
1248        struct hidp_session *session = arg;
1249        wait_queue_t ctrl_wait, intr_wait;
1250
1251        BT_DBG("session %p", session);
1252
1253        /* initialize runtime environment */
1254        hidp_session_get(session);
1255        __module_get(THIS_MODULE);
1256        set_user_nice(current, -15);
1257        hidp_set_timer(session);
1258
1259        init_waitqueue_entry(&ctrl_wait, current);
1260        init_waitqueue_entry(&intr_wait, current);
1261        add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
1262        add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1263        /* This memory barrier is paired with wq_has_sleeper(). See
1264         * sock_poll_wait() for more information why this is needed. */
1265        smp_mb();
1266
1267        /* notify synchronous startup that we're ready */
1268        atomic_inc(&session->state);
1269        wake_up(&session->state_queue);
1270
1271        /* run session */
1272        hidp_session_run(session);
1273
1274        /* cleanup runtime environment */
1275        remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1276        remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait);
1277        wake_up_interruptible(&session->report_queue);
1278        hidp_del_timer(session);
1279
1280        /*
1281         * If we stopped ourself due to any internal signal, we should try to
1282         * unregister our own session here to avoid having it linger until the
1283         * parent l2cap_conn dies or user-space cleans it up.
1284         * This does not deadlock as we don't do any synchronous shutdown.
1285         * Instead, this call has the same semantics as if user-space tried to
1286         * delete the session.
1287         */
1288        l2cap_unregister_user(session->conn, &session->user);
1289        hidp_session_put(session);
1290
1291        module_put_and_exit(0);
1292        return 0;
1293}
1294
1295static int hidp_verify_sockets(struct socket *ctrl_sock,
1296                               struct socket *intr_sock)
1297{
1298        struct l2cap_chan *ctrl_chan, *intr_chan;
1299        struct bt_sock *ctrl, *intr;
1300        struct hidp_session *session;
1301
1302        if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock))
1303                return -EINVAL;
1304
1305        ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan;
1306        intr_chan = l2cap_pi(intr_sock->sk)->chan;
1307
1308        if (bacmp(&ctrl_chan->src, &intr_chan->src) ||
1309            bacmp(&ctrl_chan->dst, &intr_chan->dst))
1310                return -ENOTUNIQ;
1311
1312        ctrl = bt_sk(ctrl_sock->sk);
1313        intr = bt_sk(intr_sock->sk);
1314
1315        if (ctrl->sk.sk_state != BT_CONNECTED ||
1316            intr->sk.sk_state != BT_CONNECTED)
1317                return -EBADFD;
1318
1319        /* early session check, we check again during session registration */
1320        session = hidp_session_find(&ctrl_chan->dst);
1321        if (session) {
1322                hidp_session_put(session);
1323                return -EEXIST;
1324        }
1325
1326        return 0;
1327}
1328
1329int hidp_connection_add(struct hidp_connadd_req *req,
1330                        struct socket *ctrl_sock,
1331                        struct socket *intr_sock)
1332{
1333        struct hidp_session *session;
1334        struct l2cap_conn *conn;
1335        struct l2cap_chan *chan = l2cap_pi(ctrl_sock->sk)->chan;
1336        int ret;
1337
1338        ret = hidp_verify_sockets(ctrl_sock, intr_sock);
1339        if (ret)
1340                return ret;
1341
1342        conn = NULL;
1343        l2cap_chan_lock(chan);
1344        if (chan->conn) {
1345                l2cap_conn_get(chan->conn);
1346                conn = chan->conn;
1347        }
1348        l2cap_chan_unlock(chan);
1349
1350        if (!conn)
1351                return -EBADFD;
1352
1353        ret = hidp_session_new(&session, &chan->dst, ctrl_sock,
1354                               intr_sock, req, conn);
1355        if (ret)
1356                goto out_conn;
1357
1358        ret = l2cap_register_user(conn, &session->user);
1359        if (ret)
1360                goto out_session;
1361
1362        ret = 0;
1363
1364out_session:
1365        hidp_session_put(session);
1366out_conn:
1367        l2cap_conn_put(conn);
1368        return ret;
1369}
1370
1371int hidp_connection_del(struct hidp_conndel_req *req)
1372{
1373        struct hidp_session *session;
1374
1375        session = hidp_session_find(&req->bdaddr);
1376        if (!session)
1377                return -ENOENT;
1378
1379        if (req->flags & (1 << HIDP_VIRTUAL_CABLE_UNPLUG))
1380                hidp_send_ctrl_message(session,
1381                                       HIDP_TRANS_HID_CONTROL |
1382                                         HIDP_CTRL_VIRTUAL_CABLE_UNPLUG,
1383                                       NULL, 0);
1384        else
1385                l2cap_unregister_user(session->conn, &session->user);
1386
1387        hidp_session_put(session);
1388
1389        return 0;
1390}
1391
1392int hidp_get_connlist(struct hidp_connlist_req *req)
1393{
1394        struct hidp_session *session;
1395        int err = 0, n = 0;
1396
1397        BT_DBG("");
1398
1399        down_read(&hidp_session_sem);
1400
1401        list_for_each_entry(session, &hidp_session_list, list) {
1402                struct hidp_conninfo ci;
1403
1404                hidp_copy_session(session, &ci);
1405
1406                if (copy_to_user(req->ci, &ci, sizeof(ci))) {
1407                        err = -EFAULT;
1408                        break;
1409                }
1410
1411                if (++n >= req->cnum)
1412                        break;
1413
1414                req->ci++;
1415        }
1416        req->cnum = n;
1417
1418        up_read(&hidp_session_sem);
1419        return err;
1420}
1421
1422int hidp_get_conninfo(struct hidp_conninfo *ci)
1423{
1424        struct hidp_session *session;
1425
1426        session = hidp_session_find(&ci->bdaddr);
1427        if (session) {
1428                hidp_copy_session(session, ci);
1429                hidp_session_put(session);
1430        }
1431
1432        return session ? 0 : -ENOENT;
1433}
1434
1435static int __init hidp_init(void)
1436{
1437        BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1438
1439        return hidp_init_sockets();
1440}
1441
1442static void __exit hidp_exit(void)
1443{
1444        hidp_cleanup_sockets();
1445}
1446
1447module_init(hidp_init);
1448module_exit(hidp_exit);
1449
1450MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1451MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
1452MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1453MODULE_VERSION(VERSION);
1454MODULE_LICENSE("GPL");
1455MODULE_ALIAS("bt-proto-6");
1456
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