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        u32 valid_flags = 0;
  74        memset(ci, 0, sizeof(*ci));
  75        bacpy(&ci->bdaddr, &session->bdaddr);
  76
  77        ci->flags = session->flags & valid_flags;
  78        ci->state = BT_CONNECTED;
  79
  80        if (session->input) {
  81                ci->vendor  = session->input->id.vendor;
  82                ci->product = session->input->id.product;
  83                ci->version = session->input->id.version;
  84                if (session->input->name)
  85                        strlcpy(ci->name, session->input->name, 128);
  86                else
  87                        strlcpy(ci->name, "HID Boot Device", 128);
  88        } else if (session->hid) {
  89                ci->vendor  = session->hid->vendor;
  90                ci->product = session->hid->product;
  91                ci->version = session->hid->version;
  92                strlcpy(ci->name, session->hid->name, 128);
  93        }
  94}
  95
  96/* assemble skb, queue message on @transmit and wake up the session thread */
  97static int hidp_send_message(struct hidp_session *session, struct socket *sock,
  98                             struct sk_buff_head *transmit, unsigned char hdr,
  99                             const unsigned char *data, int size)
 100{
 101        struct sk_buff *skb;
 102        struct sock *sk = sock->sk;
 103
 104        BT_DBG("session %p data %p size %d", session, data, size);
 105
 106        if (atomic_read(&session->terminate))
 107                return -EIO;
 108
 109        skb = alloc_skb(size + 1, GFP_ATOMIC);
 110        if (!skb) {
 111                BT_ERR("Can't allocate memory for new frame");
 112                return -ENOMEM;
 113        }
 114
 115        *skb_put(skb, 1) = hdr;
 116        if (data && size > 0)
 117                memcpy(skb_put(skb, size), data, size);
 118
 119        skb_queue_tail(transmit, skb);
 120        wake_up_interruptible(sk_sleep(sk));
 121
 122        return 0;
 123}
 124
 125static int hidp_send_ctrl_message(struct hidp_session *session,
 126                                  unsigned char hdr, const unsigned char *data,
 127                                  int size)
 128{
 129        return hidp_send_message(session, session->ctrl_sock,
 130                                 &session->ctrl_transmit, hdr, data, size);
 131}
 132
 133static int hidp_send_intr_message(struct hidp_session *session,
 134                                  unsigned char hdr, const unsigned char *data,
 135                                  int size)
 136{
 137        return hidp_send_message(session, session->intr_sock,
 138                                 &session->intr_transmit, hdr, data, size);
 139}
 140
 141static int hidp_input_event(struct input_dev *dev, unsigned int type,
 142                            unsigned int code, int value)
 143{
 144        struct hidp_session *session = input_get_drvdata(dev);
 145        unsigned char newleds;
 146        unsigned char hdr, data[2];
 147
 148        BT_DBG("session %p type %d code %d value %d",
 149               session, type, code, value);
 150
 151        if (type != EV_LED)
 152                return -1;
 153
 154        newleds = (!!test_bit(LED_KANA,    dev->led) << 3) |
 155                  (!!test_bit(LED_COMPOSE, dev->led) << 3) |
 156                  (!!test_bit(LED_SCROLLL, dev->led) << 2) |
 157                  (!!test_bit(LED_CAPSL,   dev->led) << 1) |
 158                  (!!test_bit(LED_NUML,    dev->led) << 0);
 159
 160        if (session->leds == newleds)
 161                return 0;
 162
 163        session->leds = newleds;
 164
 165        hdr = HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT;
 166        data[0] = 0x01;
 167        data[1] = newleds;
 168
 169        return hidp_send_intr_message(session, hdr, data, 2);
 170}
 171
 172static void hidp_input_report(struct hidp_session *session, struct sk_buff *skb)
 173{
 174        struct input_dev *dev = session->input;
 175        unsigned char *keys = session->keys;
 176        unsigned char *udata = skb->data + 1;
 177        signed char *sdata = skb->data + 1;
 178        int i, size = skb->len - 1;
 179
 180        switch (skb->data[0]) {
 181        case 0x01:      /* Keyboard report */
 182                for (i = 0; i < 8; i++)
 183                        input_report_key(dev, hidp_keycode[i + 224], (udata[0] >> i) & 1);
 184
 185                /* If all the key codes have been set to 0x01, it means
 186                 * too many keys were pressed at the same time. */
 187                if (!memcmp(udata + 2, hidp_mkeyspat, 6))
 188                        break;
 189
 190                for (i = 2; i < 8; i++) {
 191                        if (keys[i] > 3 && memscan(udata + 2, keys[i], 6) == udata + 8) {
 192                                if (hidp_keycode[keys[i]])
 193                                        input_report_key(dev, hidp_keycode[keys[i]], 0);
 194                                else
 195                                        BT_ERR("Unknown key (scancode %#x) released.", keys[i]);
 196                        }
 197
 198                        if (udata[i] > 3 && memscan(keys + 2, udata[i], 6) == keys + 8) {
 199                                if (hidp_keycode[udata[i]])
 200                                        input_report_key(dev, hidp_keycode[udata[i]], 1);
 201                                else
 202                                        BT_ERR("Unknown key (scancode %#x) pressed.", udata[i]);
 203                        }
 204                }
 205
 206                memcpy(keys, udata, 8);
 207                break;
 208
 209        case 0x02:      /* Mouse report */
 210                input_report_key(dev, BTN_LEFT,   sdata[0] & 0x01);
 211                input_report_key(dev, BTN_RIGHT,  sdata[0] & 0x02);
 212                input_report_key(dev, BTN_MIDDLE, sdata[0] & 0x04);
 213                input_report_key(dev, BTN_SIDE,   sdata[0] & 0x08);
 214                input_report_key(dev, BTN_EXTRA,  sdata[0] & 0x10);
 215
 216                input_report_rel(dev, REL_X, sdata[1]);
 217                input_report_rel(dev, REL_Y, sdata[2]);
 218
 219                if (size > 3)
 220                        input_report_rel(dev, REL_WHEEL, sdata[3]);
 221                break;
 222        }
 223
 224        input_sync(dev);
 225}
 226
 227static int hidp_get_raw_report(struct hid_device *hid,
 228                unsigned char report_number,
 229                unsigned char *data, size_t count,
 230                unsigned char report_type)
 231{
 232        struct hidp_session *session = hid->driver_data;
 233        struct sk_buff *skb;
 234        size_t len;
 235        int numbered_reports = hid->report_enum[report_type].numbered;
 236        int ret;
 237
 238        if (atomic_read(&session->terminate))
 239                return -EIO;
 240
 241        switch (report_type) {
 242        case HID_FEATURE_REPORT:
 243                report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_FEATURE;
 244                break;
 245        case HID_INPUT_REPORT:
 246                report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_INPUT;
 247                break;
 248        case HID_OUTPUT_REPORT:
 249                report_type = HIDP_TRANS_GET_REPORT | HIDP_DATA_RTYPE_OUPUT;
 250                break;
 251        default:
 252                return -EINVAL;
 253        }
 254
 255        if (mutex_lock_interruptible(&session->report_mutex))
 256                return -ERESTARTSYS;
 257
 258        /* Set up our wait, and send the report request to the device. */
 259        session->waiting_report_type = report_type & HIDP_DATA_RTYPE_MASK;
 260        session->waiting_report_number = numbered_reports ? report_number : -1;
 261        set_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
 262        data[0] = report_number;
 263        ret = hidp_send_ctrl_message(session, report_type, data, 1);
 264        if (ret)
 265                goto err;
 266
 267        /* Wait for the return of the report. The returned report
 268           gets put in session->report_return.  */
 269        while (test_bit(HIDP_WAITING_FOR_RETURN, &session->flags) &&
 270               !atomic_read(&session->terminate)) {
 271                int res;
 272
 273                res = wait_event_interruptible_timeout(session->report_queue,
 274                        !test_bit(HIDP_WAITING_FOR_RETURN, &session->flags)
 275                                || atomic_read(&session->terminate),
 276                        5*HZ);
 277                if (res == 0) {
 278                        /* timeout */
 279                        ret = -EIO;
 280                        goto err;
 281                }
 282                if (res < 0) {
 283                        /* signal */
 284                        ret = -ERESTARTSYS;
 285                        goto err;
 286                }
 287        }
 288
 289        skb = session->report_return;
 290        if (skb) {
 291                len = skb->len < count ? skb->len : count;
 292                memcpy(data, skb->data, len);
 293
 294                kfree_skb(skb);
 295                session->report_return = NULL;
 296        } else {
 297                /* Device returned a HANDSHAKE, indicating  protocol error. */
 298                len = -EIO;
 299        }
 300
 301        clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
 302        mutex_unlock(&session->report_mutex);
 303
 304        return len;
 305
 306err:
 307        clear_bit(HIDP_WAITING_FOR_RETURN, &session->flags);
 308        mutex_unlock(&session->report_mutex);
 309        return ret;
 310}
 311
 312static int hidp_set_raw_report(struct hid_device *hid, unsigned char reportnum,
 313                               unsigned char *data, size_t count,
 314                               unsigned char report_type)
 315{
 316        struct hidp_session *session = hid->driver_data;
 317        int ret;
 318
 319        switch (report_type) {
 320        case HID_FEATURE_REPORT:
 321                report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_FEATURE;
 322                break;
 323        case HID_INPUT_REPORT:
 324                report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_INPUT;
 325                break;
 326        case HID_OUTPUT_REPORT:
 327                report_type = HIDP_TRANS_SET_REPORT | HIDP_DATA_RTYPE_OUPUT;
 328                break;
 329        default:
 330                return -EINVAL;
 331        }
 332
 333        if (mutex_lock_interruptible(&session->report_mutex))
 334                return -ERESTARTSYS;
 335
 336        /* Set up our wait, and send the report request to the device. */
 337        data[0] = reportnum;
 338        set_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
 339        ret = hidp_send_ctrl_message(session, report_type, data, count);
 340        if (ret)
 341                goto err;
 342
 343        /* Wait for the ACK from the device. */
 344        while (test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags) &&
 345               !atomic_read(&session->terminate)) {
 346                int res;
 347
 348                res = wait_event_interruptible_timeout(session->report_queue,
 349                        !test_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags)
 350                                || atomic_read(&session->terminate),
 351                        10*HZ);
 352                if (res == 0) {
 353                        /* timeout */
 354                        ret = -EIO;
 355                        goto err;
 356                }
 357                if (res < 0) {
 358                        /* signal */
 359                        ret = -ERESTARTSYS;
 360                        goto err;
 361                }
 362        }
 363
 364        if (!session->output_report_success) {
 365                ret = -EIO;
 366                goto err;
 367        }
 368
 369        ret = count;
 370
 371err:
 372        clear_bit(HIDP_WAITING_FOR_SEND_ACK, &session->flags);
 373        mutex_unlock(&session->report_mutex);
 374        return ret;
 375}
 376
 377static int hidp_output_report(struct hid_device *hid, __u8 *data, size_t count)
 378{
 379        struct hidp_session *session = hid->driver_data;
 380
 381        return hidp_send_intr_message(session,
 382                                      HIDP_TRANS_DATA | HIDP_DATA_RTYPE_OUPUT,
 383                                      data, count);
 384}
 385
 386static int hidp_raw_request(struct hid_device *hid, unsigned char reportnum,
 387                            __u8 *buf, size_t len, unsigned char rtype,
 388                            int reqtype)
 389{
 390        switch (reqtype) {
 391        case HID_REQ_GET_REPORT:
 392                return hidp_get_raw_report(hid, reportnum, buf, len, rtype);
 393        case HID_REQ_SET_REPORT:
 394                return hidp_set_raw_report(hid, reportnum, buf, len, rtype);
 395        default:
 396                return -EIO;
 397        }
 398}
 399
 400static void hidp_idle_timeout(unsigned long arg)
 401{
 402        struct hidp_session *session = (struct hidp_session *) arg;
 403
 404        /* The HIDP user-space API only contains calls to add and remove
 405         * devices. There is no way to forward events of any kind. Therefore,
 406         * we have to forcefully disconnect a device on idle-timeouts. This is
 407         * unfortunate and weird API design, but it is spec-compliant and
 408         * required for backwards-compatibility. Hence, on idle-timeout, we
 409         * signal driver-detach events, so poll() will be woken up with an
 410         * error-condition on both sockets.
 411         */
 412
 413        session->intr_sock->sk->sk_err = EUNATCH;
 414        session->ctrl_sock->sk->sk_err = EUNATCH;
 415        wake_up_interruptible(sk_sleep(session->intr_sock->sk));
 416        wake_up_interruptible(sk_sleep(session->ctrl_sock->sk));
 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        .raw_request = hidp_raw_request,
 743        .output_report = hidp_output_report,
 744};
 745
 746/* This function sets up the hid device. It does not add it
 747   to the HID system. That is done in hidp_add_connection(). */
 748static int hidp_setup_hid(struct hidp_session *session,
 749                                struct hidp_connadd_req *req)
 750{
 751        struct hid_device *hid;
 752        int err;
 753
 754        session->rd_data = memdup_user(req->rd_data, req->rd_size);
 755        if (IS_ERR(session->rd_data))
 756                return PTR_ERR(session->rd_data);
 757
 758        session->rd_size = req->rd_size;
 759
 760        hid = hid_allocate_device();
 761        if (IS_ERR(hid)) {
 762                err = PTR_ERR(hid);
 763                goto fault;
 764        }
 765
 766        session->hid = hid;
 767
 768        hid->driver_data = session;
 769
 770        hid->bus     = BUS_BLUETOOTH;
 771        hid->vendor  = req->vendor;
 772        hid->product = req->product;
 773        hid->version = req->version;
 774        hid->country = req->country;
 775
 776        strncpy(hid->name, req->name, sizeof(req->name) - 1);
 777
 778        snprintf(hid->phys, sizeof(hid->phys), "%pMR",
 779                 &l2cap_pi(session->ctrl_sock->sk)->chan->src);
 780
 781        /* NOTE: Some device modules depend on the dst address being stored in
 782         * uniq. Please be aware of this before making changes to this behavior.
 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        /* True if device is blacklisted in drivers/hid/hid-core.c */
 791        if (hid_ignore(hid)) {
 792                hid_destroy_device(session->hid);
 793                session->hid = NULL;
 794                return -ENODEV;
 795        }
 796
 797        return 0;
 798
 799fault:
 800        kfree(session->rd_data);
 801        session->rd_data = NULL;
 802
 803        return err;
 804}
 805
 806/* initialize session devices */
 807static int hidp_session_dev_init(struct hidp_session *session,
 808                                 struct hidp_connadd_req *req)
 809{
 810        int ret;
 811
 812        if (req->rd_size > 0) {
 813                ret = hidp_setup_hid(session, req);
 814                if (ret && ret != -ENODEV)
 815                        return ret;
 816        }
 817
 818        if (!session->hid) {
 819                ret = hidp_setup_input(session, req);
 820                if (ret < 0)
 821                        return ret;
 822        }
 823
 824        return 0;
 825}
 826
 827/* destroy session devices */
 828static void hidp_session_dev_destroy(struct hidp_session *session)
 829{
 830        if (session->hid)
 831                put_device(&session->hid->dev);
 832        else if (session->input)
 833                input_put_device(session->input);
 834
 835        kfree(session->rd_data);
 836        session->rd_data = NULL;
 837}
 838
 839/* add HID/input devices to their underlying bus systems */
 840static int hidp_session_dev_add(struct hidp_session *session)
 841{
 842        int ret;
 843
 844        /* Both HID and input systems drop a ref-count when unregistering the
 845         * device but they don't take a ref-count when registering them. Work
 846         * around this by explicitly taking a refcount during registration
 847         * which is dropped automatically by unregistering the devices. */
 848
 849        if (session->hid) {
 850                ret = hid_add_device(session->hid);
 851                if (ret)
 852                        return ret;
 853                get_device(&session->hid->dev);
 854        } else if (session->input) {
 855                ret = input_register_device(session->input);
 856                if (ret)
 857                        return ret;
 858                input_get_device(session->input);
 859        }
 860
 861        return 0;
 862}
 863
 864/* remove HID/input devices from their bus systems */
 865static void hidp_session_dev_del(struct hidp_session *session)
 866{
 867        if (session->hid)
 868                hid_destroy_device(session->hid);
 869        else if (session->input)
 870                input_unregister_device(session->input);
 871}
 872
 873/*
 874 * Asynchronous device registration
 875 * HID device drivers might want to perform I/O during initialization to
 876 * detect device types. Therefore, call device registration in a separate
 877 * worker so the HIDP thread can schedule I/O operations.
 878 * Note that this must be called after the worker thread was initialized
 879 * successfully. This will then add the devices and increase session state
 880 * on success, otherwise it will terminate the session thread.
 881 */
 882static void hidp_session_dev_work(struct work_struct *work)
 883{
 884        struct hidp_session *session = container_of(work,
 885                                                    struct hidp_session,
 886                                                    dev_init);
 887        int ret;
 888
 889        ret = hidp_session_dev_add(session);
 890        if (!ret)
 891                atomic_inc(&session->state);
 892        else
 893                hidp_session_terminate(session);
 894}
 895
 896/*
 897 * Create new session object
 898 * Allocate session object, initialize static fields, copy input data into the
 899 * object and take a reference to all sub-objects.
 900 * This returns 0 on success and puts a pointer to the new session object in
 901 * \out. Otherwise, an error code is returned.
 902 * The new session object has an initial ref-count of 1.
 903 */
 904static int hidp_session_new(struct hidp_session **out, const bdaddr_t *bdaddr,
 905                            struct socket *ctrl_sock,
 906                            struct socket *intr_sock,
 907                            struct hidp_connadd_req *req,
 908                            struct l2cap_conn *conn)
 909{
 910        struct hidp_session *session;
 911        int ret;
 912        struct bt_sock *ctrl, *intr;
 913
 914        ctrl = bt_sk(ctrl_sock->sk);
 915        intr = bt_sk(intr_sock->sk);
 916
 917        session = kzalloc(sizeof(*session), GFP_KERNEL);
 918        if (!session)
 919                return -ENOMEM;
 920
 921        /* object and runtime management */
 922        kref_init(&session->ref);
 923        atomic_set(&session->state, HIDP_SESSION_IDLING);
 924        init_waitqueue_head(&session->state_queue);
 925        session->flags = req->flags & BIT(HIDP_BLUETOOTH_VENDOR_ID);
 926
 927        /* connection management */
 928        bacpy(&session->bdaddr, bdaddr);
 929        session->conn = l2cap_conn_get(conn);
 930        session->user.probe = hidp_session_probe;
 931        session->user.remove = hidp_session_remove;
 932        INIT_LIST_HEAD(&session->user.list);
 933        session->ctrl_sock = ctrl_sock;
 934        session->intr_sock = intr_sock;
 935        skb_queue_head_init(&session->ctrl_transmit);
 936        skb_queue_head_init(&session->intr_transmit);
 937        session->ctrl_mtu = min_t(uint, l2cap_pi(ctrl)->chan->omtu,
 938                                        l2cap_pi(ctrl)->chan->imtu);
 939        session->intr_mtu = min_t(uint, l2cap_pi(intr)->chan->omtu,
 940                                        l2cap_pi(intr)->chan->imtu);
 941        session->idle_to = req->idle_to;
 942
 943        /* device management */
 944        INIT_WORK(&session->dev_init, hidp_session_dev_work);
 945        setup_timer(&session->timer, hidp_idle_timeout,
 946                    (unsigned long)session);
 947
 948        /* session data */
 949        mutex_init(&session->report_mutex);
 950        init_waitqueue_head(&session->report_queue);
 951
 952        ret = hidp_session_dev_init(session, req);
 953        if (ret)
 954                goto err_free;
 955
 956        get_file(session->intr_sock->file);
 957        get_file(session->ctrl_sock->file);
 958        *out = session;
 959        return 0;
 960
 961err_free:
 962        l2cap_conn_put(session->conn);
 963        kfree(session);
 964        return ret;
 965}
 966
 967/* increase ref-count of the given session by one */
 968static void hidp_session_get(struct hidp_session *session)
 969{
 970        kref_get(&session->ref);
 971}
 972
 973/* release callback */
 974static void session_free(struct kref *ref)
 975{
 976        struct hidp_session *session = container_of(ref, struct hidp_session,
 977                                                    ref);
 978
 979        hidp_session_dev_destroy(session);
 980        skb_queue_purge(&session->ctrl_transmit);
 981        skb_queue_purge(&session->intr_transmit);
 982        fput(session->intr_sock->file);
 983        fput(session->ctrl_sock->file);
 984        l2cap_conn_put(session->conn);
 985        kfree(session);
 986}
 987
 988/* decrease ref-count of the given session by one */
 989static void hidp_session_put(struct hidp_session *session)
 990{
 991        kref_put(&session->ref, session_free);
 992}
 993
 994/*
 995 * Search the list of active sessions for a session with target address
 996 * \bdaddr. You must hold at least a read-lock on \hidp_session_sem. As long as
 997 * you do not release this lock, the session objects cannot vanish and you can
 998 * safely take a reference to the session yourself.
 999 */
1000static struct hidp_session *__hidp_session_find(const bdaddr_t *bdaddr)
1001{
1002        struct hidp_session *session;
1003
1004        list_for_each_entry(session, &hidp_session_list, list) {
1005                if (!bacmp(bdaddr, &session->bdaddr))
1006                        return session;
1007        }
1008
1009        return NULL;
1010}
1011
1012/*
1013 * Same as __hidp_session_find() but no locks must be held. This also takes a
1014 * reference of the returned session (if non-NULL) so you must drop this
1015 * reference if you no longer use the object.
1016 */
1017static struct hidp_session *hidp_session_find(const bdaddr_t *bdaddr)
1018{
1019        struct hidp_session *session;
1020
1021        down_read(&hidp_session_sem);
1022
1023        session = __hidp_session_find(bdaddr);
1024        if (session)
1025                hidp_session_get(session);
1026
1027        up_read(&hidp_session_sem);
1028
1029        return session;
1030}
1031
1032/*
1033 * Start session synchronously
1034 * This starts a session thread and waits until initialization
1035 * is done or returns an error if it couldn't be started.
1036 * If this returns 0 the session thread is up and running. You must call
1037 * hipd_session_stop_sync() before deleting any runtime resources.
1038 */
1039static int hidp_session_start_sync(struct hidp_session *session)
1040{
1041        unsigned int vendor, product;
1042
1043        if (session->hid) {
1044                vendor  = session->hid->vendor;
1045                product = session->hid->product;
1046        } else if (session->input) {
1047                vendor  = session->input->id.vendor;
1048                product = session->input->id.product;
1049        } else {
1050                vendor = 0x0000;
1051                product = 0x0000;
1052        }
1053
1054        session->task = kthread_run(hidp_session_thread, session,
1055                                    "khidpd_%04x%04x", vendor, product);
1056        if (IS_ERR(session->task))
1057                return PTR_ERR(session->task);
1058
1059        while (atomic_read(&session->state) <= HIDP_SESSION_IDLING)
1060                wait_event(session->state_queue,
1061                           atomic_read(&session->state) > HIDP_SESSION_IDLING);
1062
1063        return 0;
1064}
1065
1066/*
1067 * Terminate session thread
1068 * Wake up session thread and notify it to stop. This is asynchronous and
1069 * returns immediately. Call this whenever a runtime error occurs and you want
1070 * the session to stop.
1071 * Note: wake_up_process() performs any necessary memory-barriers for us.
1072 */
1073static void hidp_session_terminate(struct hidp_session *session)
1074{
1075        atomic_inc(&session->terminate);
1076        wake_up_process(session->task);
1077}
1078
1079/*
1080 * Probe HIDP session
1081 * This is called from the l2cap_conn core when our l2cap_user object is bound
1082 * to the hci-connection. We get the session via the \user object and can now
1083 * start the session thread, link it into the global session list and
1084 * schedule HID/input device registration.
1085 * The global session-list owns its own reference to the session object so you
1086 * can drop your own reference after registering the l2cap_user object.
1087 */
1088static int hidp_session_probe(struct l2cap_conn *conn,
1089                              struct l2cap_user *user)
1090{
1091        struct hidp_session *session = container_of(user,
1092                                                    struct hidp_session,
1093                                                    user);
1094        struct hidp_session *s;
1095        int ret;
1096
1097        down_write(&hidp_session_sem);
1098
1099        /* check that no other session for this device exists */
1100        s = __hidp_session_find(&session->bdaddr);
1101        if (s) {
1102                ret = -EEXIST;
1103                goto out_unlock;
1104        }
1105
1106        if (session->input) {
1107                ret = hidp_session_dev_add(session);
1108                if (ret)
1109                        goto out_unlock;
1110        }
1111
1112        ret = hidp_session_start_sync(session);
1113        if (ret)
1114                goto out_del;
1115
1116        /* HID device registration is async to allow I/O during probe */
1117        if (session->input)
1118                atomic_inc(&session->state);
1119        else
1120                schedule_work(&session->dev_init);
1121
1122        hidp_session_get(session);
1123        list_add(&session->list, &hidp_session_list);
1124        ret = 0;
1125        goto out_unlock;
1126
1127out_del:
1128        if (session->input)
1129                hidp_session_dev_del(session);
1130out_unlock:
1131        up_write(&hidp_session_sem);
1132        return ret;
1133}
1134
1135/*
1136 * Remove HIDP session
1137 * Called from the l2cap_conn core when either we explicitly unregistered
1138 * the l2cap_user object or if the underlying connection is shut down.
1139 * We signal the hidp-session thread to shut down, unregister the HID/input
1140 * devices and unlink the session from the global list.
1141 * This drops the reference to the session that is owned by the global
1142 * session-list.
1143 * Note: We _must_ not synchronosly wait for the session-thread to shut down.
1144 * This is, because the session-thread might be waiting for an HCI lock that is
1145 * held while we are called. Therefore, we only unregister the devices and
1146 * notify the session-thread to terminate. The thread itself owns a reference
1147 * to the session object so it can safely shut down.
1148 */
1149static void hidp_session_remove(struct l2cap_conn *conn,
1150                                struct l2cap_user *user)
1151{
1152        struct hidp_session *session = container_of(user,
1153                                                    struct hidp_session,
1154                                                    user);
1155
1156        down_write(&hidp_session_sem);
1157
1158        hidp_session_terminate(session);
1159
1160        cancel_work_sync(&session->dev_init);
1161        if (session->input ||
1162            atomic_read(&session->state) > HIDP_SESSION_PREPARING)
1163                hidp_session_dev_del(session);
1164
1165        list_del(&session->list);
1166
1167        up_write(&hidp_session_sem);
1168
1169        hidp_session_put(session);
1170}
1171
1172/*
1173 * Session Worker
1174 * This performs the actual main-loop of the HIDP worker. We first check
1175 * whether the underlying connection is still alive, then parse all pending
1176 * messages and finally send all outstanding messages.
1177 */
1178static void hidp_session_run(struct hidp_session *session)
1179{
1180        struct sock *ctrl_sk = session->ctrl_sock->sk;
1181        struct sock *intr_sk = session->intr_sock->sk;
1182        struct sk_buff *skb;
1183
1184        for (;;) {
1185                /*
1186                 * This thread can be woken up two ways:
1187                 *  - You call hidp_session_terminate() which sets the
1188                 *    session->terminate flag and wakes this thread up.
1189                 *  - Via modifying the socket state of ctrl/intr_sock. This
1190                 *    thread is woken up by ->sk_state_changed().
1191                 *
1192                 * Note: set_current_state() performs any necessary
1193                 * memory-barriers for us.
1194                 */
1195                set_current_state(TASK_INTERRUPTIBLE);
1196
1197                if (atomic_read(&session->terminate))
1198                        break;
1199
1200                if (ctrl_sk->sk_state != BT_CONNECTED ||
1201                    intr_sk->sk_state != BT_CONNECTED)
1202                        break;
1203
1204                /* parse incoming intr-skbs */
1205                while ((skb = skb_dequeue(&intr_sk->sk_receive_queue))) {
1206                        skb_orphan(skb);
1207                        if (!skb_linearize(skb))
1208                                hidp_recv_intr_frame(session, skb);
1209                        else
1210                                kfree_skb(skb);
1211                }
1212
1213                /* send pending intr-skbs */
1214                hidp_process_transmit(session, &session->intr_transmit,
1215                                      session->intr_sock);
1216
1217                /* parse incoming ctrl-skbs */
1218                while ((skb = skb_dequeue(&ctrl_sk->sk_receive_queue))) {
1219                        skb_orphan(skb);
1220                        if (!skb_linearize(skb))
1221                                hidp_recv_ctrl_frame(session, skb);
1222                        else
1223                                kfree_skb(skb);
1224                }
1225
1226                /* send pending ctrl-skbs */
1227                hidp_process_transmit(session, &session->ctrl_transmit,
1228                                      session->ctrl_sock);
1229
1230                schedule();
1231        }
1232
1233        atomic_inc(&session->terminate);
1234        set_current_state(TASK_RUNNING);
1235}
1236
1237/*
1238 * HIDP session thread
1239 * This thread runs the I/O for a single HIDP session. Startup is synchronous
1240 * which allows us to take references to ourself here instead of doing that in
1241 * the caller.
1242 * When we are ready to run we notify the caller and call hidp_session_run().
1243 */
1244static int hidp_session_thread(void *arg)
1245{
1246        struct hidp_session *session = arg;
1247        wait_queue_t ctrl_wait, intr_wait;
1248
1249        BT_DBG("session %p", session);
1250
1251        /* initialize runtime environment */
1252        hidp_session_get(session);
1253        __module_get(THIS_MODULE);
1254        set_user_nice(current, -15);
1255        hidp_set_timer(session);
1256
1257        init_waitqueue_entry(&ctrl_wait, current);
1258        init_waitqueue_entry(&intr_wait, current);
1259        add_wait_queue(sk_sleep(session->ctrl_sock->sk), &ctrl_wait);
1260        add_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1261        /* This memory barrier is paired with wq_has_sleeper(). See
1262         * sock_poll_wait() for more information why this is needed. */
1263        smp_mb();
1264
1265        /* notify synchronous startup that we're ready */
1266        atomic_inc(&session->state);
1267        wake_up(&session->state_queue);
1268
1269        /* run session */
1270        hidp_session_run(session);
1271
1272        /* cleanup runtime environment */
1273        remove_wait_queue(sk_sleep(session->intr_sock->sk), &intr_wait);
1274        remove_wait_queue(sk_sleep(session->intr_sock->sk), &ctrl_wait);
1275        wake_up_interruptible(&session->report_queue);
1276        hidp_del_timer(session);
1277
1278        /*
1279         * If we stopped ourself due to any internal signal, we should try to
1280         * unregister our own session here to avoid having it linger until the
1281         * parent l2cap_conn dies or user-space cleans it up.
1282         * This does not deadlock as we don't do any synchronous shutdown.
1283         * Instead, this call has the same semantics as if user-space tried to
1284         * delete the session.
1285         */
1286        l2cap_unregister_user(session->conn, &session->user);
1287        hidp_session_put(session);
1288
1289        module_put_and_exit(0);
1290        return 0;
1291}
1292
1293static int hidp_verify_sockets(struct socket *ctrl_sock,
1294                               struct socket *intr_sock)
1295{
1296        struct l2cap_chan *ctrl_chan, *intr_chan;
1297        struct bt_sock *ctrl, *intr;
1298        struct hidp_session *session;
1299
1300        if (!l2cap_is_socket(ctrl_sock) || !l2cap_is_socket(intr_sock))
1301                return -EINVAL;
1302
1303        ctrl_chan = l2cap_pi(ctrl_sock->sk)->chan;
1304        intr_chan = l2cap_pi(intr_sock->sk)->chan;
1305
1306        if (bacmp(&ctrl_chan->src, &intr_chan->src) ||
1307            bacmp(&ctrl_chan->dst, &intr_chan->dst))
1308                return -ENOTUNIQ;
1309
1310        ctrl = bt_sk(ctrl_sock->sk);
1311        intr = bt_sk(intr_sock->sk);
1312
1313        if (ctrl->sk.sk_state != BT_CONNECTED ||
1314            intr->sk.sk_state != BT_CONNECTED)
1315                return -EBADFD;
1316
1317        /* early session check, we check again during session registration */
1318        session = hidp_session_find(&ctrl_chan->dst);
1319        if (session) {
1320                hidp_session_put(session);
1321                return -EEXIST;
1322        }
1323
1324        return 0;
1325}
1326
1327int hidp_connection_add(struct hidp_connadd_req *req,
1328                        struct socket *ctrl_sock,
1329                        struct socket *intr_sock)
1330{
1331        u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG) |
1332                          BIT(HIDP_BOOT_PROTOCOL_MODE);
1333        struct hidp_session *session;
1334        struct l2cap_conn *conn;
1335        struct l2cap_chan *chan;
1336        int ret;
1337
1338        ret = hidp_verify_sockets(ctrl_sock, intr_sock);
1339        if (ret)
1340                return ret;
1341
1342        if (req->flags & ~valid_flags)
1343                return -EINVAL;
1344
1345        chan = l2cap_pi(ctrl_sock->sk)->chan;
1346        conn = NULL;
1347        l2cap_chan_lock(chan);
1348        if (chan->conn)
1349                conn = l2cap_conn_get(chan->conn);
1350        l2cap_chan_unlock(chan);
1351
1352        if (!conn)
1353                return -EBADFD;
1354
1355        ret = hidp_session_new(&session, &chan->dst, ctrl_sock,
1356                               intr_sock, req, conn);
1357        if (ret)
1358                goto out_conn;
1359
1360        ret = l2cap_register_user(conn, &session->user);
1361        if (ret)
1362                goto out_session;
1363
1364        ret = 0;
1365
1366out_session:
1367        hidp_session_put(session);
1368out_conn:
1369        l2cap_conn_put(conn);
1370        return ret;
1371}
1372
1373int hidp_connection_del(struct hidp_conndel_req *req)
1374{
1375        u32 valid_flags = BIT(HIDP_VIRTUAL_CABLE_UNPLUG);
1376        struct hidp_session *session;
1377
1378        if (req->flags & ~valid_flags)
1379                return -EINVAL;
1380
1381        session = hidp_session_find(&req->bdaddr);
1382        if (!session)
1383                return -ENOENT;
1384
1385        if (req->flags & BIT(HIDP_VIRTUAL_CABLE_UNPLUG))
1386                hidp_send_ctrl_message(session,
1387                                       HIDP_TRANS_HID_CONTROL |
1388                                         HIDP_CTRL_VIRTUAL_CABLE_UNPLUG,
1389                                       NULL, 0);
1390        else
1391                l2cap_unregister_user(session->conn, &session->user);
1392
1393        hidp_session_put(session);
1394
1395        return 0;
1396}
1397
1398int hidp_get_connlist(struct hidp_connlist_req *req)
1399{
1400        struct hidp_session *session;
1401        int err = 0, n = 0;
1402
1403        BT_DBG("");
1404
1405        down_read(&hidp_session_sem);
1406
1407        list_for_each_entry(session, &hidp_session_list, list) {
1408                struct hidp_conninfo ci;
1409
1410                hidp_copy_session(session, &ci);
1411
1412                if (copy_to_user(req->ci, &ci, sizeof(ci))) {
1413                        err = -EFAULT;
1414                        break;
1415                }
1416
1417                if (++n >= req->cnum)
1418                        break;
1419
1420                req->ci++;
1421        }
1422        req->cnum = n;
1423
1424        up_read(&hidp_session_sem);
1425        return err;
1426}
1427
1428int hidp_get_conninfo(struct hidp_conninfo *ci)
1429{
1430        struct hidp_session *session;
1431
1432        session = hidp_session_find(&ci->bdaddr);
1433        if (session) {
1434                hidp_copy_session(session, ci);
1435                hidp_session_put(session);
1436        }
1437
1438        return session ? 0 : -ENOENT;
1439}
1440
1441static int __init hidp_init(void)
1442{
1443        BT_INFO("HIDP (Human Interface Emulation) ver %s", VERSION);
1444
1445        return hidp_init_sockets();
1446}
1447
1448static void __exit hidp_exit(void)
1449{
1450        hidp_cleanup_sockets();
1451}
1452
1453module_init(hidp_init);
1454module_exit(hidp_exit);
1455
1456MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1457MODULE_AUTHOR("David Herrmann <dh.herrmann@gmail.com>");
1458MODULE_DESCRIPTION("Bluetooth HIDP ver " VERSION);
1459MODULE_VERSION(VERSION);
1460MODULE_LICENSE("GPL");
1461MODULE_ALIAS("bt-proto-6");
1462
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