samples/qmi/qmi_sample_client.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Sample in-kernel QMI client driver
   4  *
   5  * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
   6  * Copyright (C) 2017 Linaro Ltd.
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/debugfs.h>
  11 #include <linux/device.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/qrtr.h>
  14 #include <linux/net.h>
  15 #include <linux/completion.h>
  16 #include <linux/idr.h>
  17 #include <linux/string.h>
  18 #include <net/sock.h>
  19 #include <linux/soc/qcom/qmi.h>
  20
  21 #define PING_REQ1_TLV_TYPE              0x1
  22 #define PING_RESP1_TLV_TYPE             0x2
  23 #define PING_OPT1_TLV_TYPE              0x10
  24 #define PING_OPT2_TLV_TYPE              0x11
  25
  26 #define DATA_REQ1_TLV_TYPE              0x1
  27 #define DATA_RESP1_TLV_TYPE             0x2
  28 #define DATA_OPT1_TLV_TYPE              0x10
  29 #define DATA_OPT2_TLV_TYPE              0x11
  30
  31 #define TEST_MED_DATA_SIZE_V01          8192
  32 #define TEST_MAX_NAME_SIZE_V01          255
  33
  34 #define TEST_PING_REQ_MSG_ID_V01        0x20
  35 #define TEST_DATA_REQ_MSG_ID_V01        0x21
  36
  37 #define TEST_PING_REQ_MAX_MSG_LEN_V01   266
  38 #define TEST_DATA_REQ_MAX_MSG_LEN_V01   8456
  39
  40 struct test_name_type_v01 {
  41         u32 name_len;
  42         char name[TEST_MAX_NAME_SIZE_V01];
  43 };
  44
  45 static struct qmi_elem_info test_name_type_v01_ei[] = {
  46         {
  47                 .data_type      = QMI_DATA_LEN,
  48                 .elem_len       = 1,
  49                 .elem_size      = sizeof(u8),
  50                 .array_type     = NO_ARRAY,
  51                 .tlv_type       = QMI_COMMON_TLV_TYPE,
  52                 .offset         = offsetof(struct test_name_type_v01,
  53                                            name_len),
  54         },
  55         {
  56                 .data_type      = QMI_UNSIGNED_1_BYTE,
  57                 .elem_len       = TEST_MAX_NAME_SIZE_V01,
  58                 .elem_size      = sizeof(char),
  59                 .array_type     = VAR_LEN_ARRAY,
  60                 .tlv_type       = QMI_COMMON_TLV_TYPE,
  61                 .offset         = offsetof(struct test_name_type_v01,
  62                                            name),
  63         },
  64         {}
  65 };
  66
  67 struct test_ping_req_msg_v01 {
  68         char ping[4];
  69
  70         u8 client_name_valid;
  71         struct test_name_type_v01 client_name;
  72 };
  73
  74 static struct qmi_elem_info test_ping_req_msg_v01_ei[] = {
  75         {
  76                 .data_type      = QMI_UNSIGNED_1_BYTE,
  77                 .elem_len       = 4,
  78                 .elem_size      = sizeof(char),
  79                 .array_type     = STATIC_ARRAY,
  80                 .tlv_type       = PING_REQ1_TLV_TYPE,
  81                 .offset         = offsetof(struct test_ping_req_msg_v01,
  82                                            ping),
  83         },
  84         {
  85                 .data_type      = QMI_OPT_FLAG,
  86                 .elem_len       = 1,
  87                 .elem_size      = sizeof(u8),
  88                 .array_type     = NO_ARRAY,
  89                 .tlv_type       = PING_OPT1_TLV_TYPE,
  90                 .offset         = offsetof(struct test_ping_req_msg_v01,
  91                                            client_name_valid),
  92         },
  93         {
  94                 .data_type      = QMI_STRUCT,
  95                 .elem_len       = 1,
  96                 .elem_size      = sizeof(struct test_name_type_v01),
  97                 .array_type     = NO_ARRAY,
  98                 .tlv_type       = PING_OPT1_TLV_TYPE,
  99                 .offset         = offsetof(struct test_ping_req_msg_v01,
 100                                            client_name),
 101                 .ei_array       = test_name_type_v01_ei,
 102         },
 103         {}
 104 };
 105
 106 struct test_ping_resp_msg_v01 {
 107         struct qmi_response_type_v01 resp;
 108
 109         u8 pong_valid;
 110         char pong[4];
 111
 112         u8 service_name_valid;
 113         struct test_name_type_v01 service_name;
 114 };
 115
 116 static struct qmi_elem_info test_ping_resp_msg_v01_ei[] = {
 117         {
 118                 .data_type      = QMI_STRUCT,
 119                 .elem_len       = 1,
 120                 .elem_size      = sizeof(struct qmi_response_type_v01),
 121                 .array_type     = NO_ARRAY,
 122                 .tlv_type       = PING_RESP1_TLV_TYPE,
 123                 .offset         = offsetof(struct test_ping_resp_msg_v01,
 124                                            resp),
 125                 .ei_array       = qmi_response_type_v01_ei,
 126         },
 127         {
 128                 .data_type      = QMI_OPT_FLAG,
 129                 .elem_len       = 1,
 130                 .elem_size      = sizeof(u8),
 131                 .array_type     = NO_ARRAY,
 132                 .tlv_type       = PING_OPT1_TLV_TYPE,
 133                 .offset         = offsetof(struct test_ping_resp_msg_v01,
 134                                            pong_valid),
 135         },
 136         {
 137                 .data_type      = QMI_UNSIGNED_1_BYTE,
 138                 .elem_len       = 4,
 139                 .elem_size      = sizeof(char),
 140                 .array_type     = STATIC_ARRAY,
 141                 .tlv_type       = PING_OPT1_TLV_TYPE,
 142                 .offset         = offsetof(struct test_ping_resp_msg_v01,
 143                                            pong),
 144         },
 145         {
 146                 .data_type      = QMI_OPT_FLAG,
 147                 .elem_len       = 1,
 148                 .elem_size      = sizeof(u8),
 149                 .array_type     = NO_ARRAY,
 150                 .tlv_type       = PING_OPT2_TLV_TYPE,
 151                 .offset         = offsetof(struct test_ping_resp_msg_v01,
 152                                            service_name_valid),
 153         },
 154         {
 155                 .data_type      = QMI_STRUCT,
 156                 .elem_len       = 1,
 157                 .elem_size      = sizeof(struct test_name_type_v01),
 158                 .array_type     = NO_ARRAY,
 159                 .tlv_type       = PING_OPT2_TLV_TYPE,
 160                 .offset         = offsetof(struct test_ping_resp_msg_v01,
 161                                            service_name),
 162                 .ei_array       = test_name_type_v01_ei,
 163         },
 164         {}
 165 };
 166
 167 struct test_data_req_msg_v01 {
 168         u32 data_len;
 169         u8 data[TEST_MED_DATA_SIZE_V01];
 170
 171         u8 client_name_valid;
 172         struct test_name_type_v01 client_name;
 173 };
 174
 175 static struct qmi_elem_info test_data_req_msg_v01_ei[] = {
 176         {
 177                 .data_type      = QMI_DATA_LEN,
 178                 .elem_len       = 1,
 179                 .elem_size      = sizeof(u32),
 180                 .array_type     = NO_ARRAY,
 181                 .tlv_type       = DATA_REQ1_TLV_TYPE,
 182                 .offset         = offsetof(struct test_data_req_msg_v01,
 183                                            data_len),
 184         },
 185         {
 186                 .data_type      = QMI_UNSIGNED_1_BYTE,
 187                 .elem_len       = TEST_MED_DATA_SIZE_V01,
 188                 .elem_size      = sizeof(u8),
 189                 .array_type     = VAR_LEN_ARRAY,
 190                 .tlv_type       = DATA_REQ1_TLV_TYPE,
 191                 .offset         = offsetof(struct test_data_req_msg_v01,
 192                                            data),
 193         },
 194         {
 195                 .data_type      = QMI_OPT_FLAG,
 196                 .elem_len       = 1,
 197                 .elem_size      = sizeof(u8),
 198                 .array_type     = NO_ARRAY,
 199                 .tlv_type       = DATA_OPT1_TLV_TYPE,
 200                 .offset         = offsetof(struct test_data_req_msg_v01,
 201                                            client_name_valid),
 202         },
 203         {
 204                 .data_type      = QMI_STRUCT,
 205                 .elem_len       = 1,
 206                 .elem_size      = sizeof(struct test_name_type_v01),
 207                 .array_type     = NO_ARRAY,
 208                 .tlv_type       = DATA_OPT1_TLV_TYPE,
 209                 .offset         = offsetof(struct test_data_req_msg_v01,
 210                                            client_name),
 211                 .ei_array       = test_name_type_v01_ei,
 212         },
 213         {}
 214 };
 215
 216 struct test_data_resp_msg_v01 {
 217         struct qmi_response_type_v01 resp;
 218
 219         u8 data_valid;
 220         u32 data_len;
 221         u8 data[TEST_MED_DATA_SIZE_V01];
 222
 223         u8 service_name_valid;
 224         struct test_name_type_v01 service_name;
 225 };
 226
 227 static struct qmi_elem_info test_data_resp_msg_v01_ei[] = {
 228         {
 229                 .data_type      = QMI_STRUCT,
 230                 .elem_len       = 1,
 231                 .elem_size      = sizeof(struct qmi_response_type_v01),
 232                 .array_type     = NO_ARRAY,
 233                 .tlv_type       = DATA_RESP1_TLV_TYPE,
 234                 .offset         = offsetof(struct test_data_resp_msg_v01,
 235                                            resp),
 236                 .ei_array       = qmi_response_type_v01_ei,
 237         },
 238         {
 239                 .data_type      = QMI_OPT_FLAG,
 240                 .elem_len       = 1,
 241                 .elem_size      = sizeof(u8),
 242                 .array_type     = NO_ARRAY,
 243                 .tlv_type       = DATA_OPT1_TLV_TYPE,
 244                 .offset         = offsetof(struct test_data_resp_msg_v01,
 245                                            data_valid),
 246         },
 247         {
 248                 .data_type      = QMI_DATA_LEN,
 249                 .elem_len       = 1,
 250                 .elem_size      = sizeof(u32),
 251                 .array_type     = NO_ARRAY,
 252                 .tlv_type       = DATA_OPT1_TLV_TYPE,
 253                 .offset         = offsetof(struct test_data_resp_msg_v01,
 254                                            data_len),
 255         },
 256         {
 257                 .data_type      = QMI_UNSIGNED_1_BYTE,
 258                 .elem_len       = TEST_MED_DATA_SIZE_V01,
 259                 .elem_size      = sizeof(u8),
 260                 .array_type     = VAR_LEN_ARRAY,
 261                 .tlv_type       = DATA_OPT1_TLV_TYPE,
 262                 .offset         = offsetof(struct test_data_resp_msg_v01,
 263                                            data),
 264         },
 265         {
 266                 .data_type      = QMI_OPT_FLAG,
 267                 .elem_len       = 1,
 268                 .elem_size      = sizeof(u8),
 269                 .array_type     = NO_ARRAY,
 270                 .tlv_type       = DATA_OPT2_TLV_TYPE,
 271                 .offset         = offsetof(struct test_data_resp_msg_v01,
 272                                            service_name_valid),
 273         },
 274         {
 275                 .data_type      = QMI_STRUCT,
 276                 .elem_len       = 1,
 277                 .elem_size      = sizeof(struct test_name_type_v01),
 278                 .array_type     = NO_ARRAY,
 279                 .tlv_type       = DATA_OPT2_TLV_TYPE,
 280                 .offset         = offsetof(struct test_data_resp_msg_v01,
 281                                            service_name),
 282                 .ei_array       = test_name_type_v01_ei,
 283         },
 284         {}
 285 };
 286
 287 /*
 288  * ping_write() - ping_pong debugfs file write handler
 289  * @file:       debugfs file context
 290  * @user_buf:   reference to the user data (ignored)
 291  * @count:      number of bytes in @user_buf
 292  * @ppos:       offset in @file to write
 293  *
 294  * This function allows user space to send out a ping_pong QMI encoded message
 295  * to the associated remote test service and will return with the result of the
 296  * transaction. It serves as an example of how to provide a custom response
 297  * handler.
 298  *
 299  * Return: @count, or negative errno on failure.
 300  */
 301 static ssize_t ping_write(struct file *file, const char __user *user_buf,
 302                           size_t count, loff_t *ppos)
 303 {
 304         struct qmi_handle *qmi = file->private_data;
 305         struct test_ping_req_msg_v01 req = {};
 306         struct qmi_txn txn;
 307         int ret;
 308
 309         memcpy(req.ping, "ping", sizeof(req.ping));
 310
 311         ret = qmi_txn_init(qmi, &txn, NULL, NULL);
 312         if (ret < 0)
 313                 return ret;
 314
 315         ret = qmi_send_request(qmi, NULL, &txn,
 316                                TEST_PING_REQ_MSG_ID_V01,
 317                                TEST_PING_REQ_MAX_MSG_LEN_V01,
 318                                test_ping_req_msg_v01_ei, &req);
 319         if (ret < 0) {
 320                 qmi_txn_cancel(&txn);
 321                 return ret;
 322         }
 323
 324         ret = qmi_txn_wait(&txn, 5 * HZ);
 325         if (ret < 0)
 326                 count = ret;
 327
 328         return count;
 329 }
 330
 331 static const struct file_operations ping_fops = {
 332         .open = simple_open,
 333         .write = ping_write,
 334 };
 335
 336 static void ping_pong_cb(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
 337                          struct qmi_txn *txn, const void *data)
 338 {
 339         const struct test_ping_resp_msg_v01 *resp = data;
 340
 341         if (!txn) {
 342                 pr_err("spurious ping response\n");
 343                 return;
 344         }
 345
 346         if (resp->resp.result == QMI_RESULT_FAILURE_V01)
 347                 txn->result = -ENXIO;
 348         else if (!resp->pong_valid || memcmp(resp->pong, "pong", 4))
 349                 txn->result = -EINVAL;
 350
 351         complete(&txn->completion);
 352 }
 353
 354 /*
 355  * data_write() - data debugfs file write handler
 356  * @file:       debugfs file context
 357  * @user_buf:   reference to the user data
 358  * @count:      number of bytes in @user_buf
 359  * @ppos:       offset in @file to write
 360  *
 361  * This function allows user space to send out a data QMI encoded message to
 362  * the associated remote test service and will return with the result of the
 363  * transaction. It serves as an example of how to have the QMI helpers decode a
 364  * transaction response into a provided object automatically.
 365  *
 366  * Return: @count, or negative errno on failure.
 367  */
 368 static ssize_t data_write(struct file *file, const char __user *user_buf,
 369                           size_t count, loff_t *ppos)
 370
 371 {
 372         struct qmi_handle *qmi = file->private_data;
 373         struct test_data_resp_msg_v01 *resp;
 374         struct test_data_req_msg_v01 *req;
 375         struct qmi_txn txn;
 376         int ret;
 377
 378         req = kzalloc(sizeof(*req), GFP_KERNEL);
 379         if (!req)
 380                 return -ENOMEM;
 381
 382         resp = kzalloc(sizeof(*resp), GFP_KERNEL);
 383         if (!resp) {
 384                 kfree(req);
 385                 return -ENOMEM;
 386         }
 387
 388         req->data_len = min_t(size_t, sizeof(req->data), count);
 389         if (copy_from_user(req->data, user_buf, req->data_len)) {
 390                 ret = -EFAULT;
 391                 goto out;
 392         }
 393
 394         ret = qmi_txn_init(qmi, &txn, test_data_resp_msg_v01_ei, resp);
 395         if (ret < 0)
 396                 goto out;
 397
 398         ret = qmi_send_request(qmi, NULL, &txn,
 399                                TEST_DATA_REQ_MSG_ID_V01,
 400                                TEST_DATA_REQ_MAX_MSG_LEN_V01,
 401                                test_data_req_msg_v01_ei, req);
 402         if (ret < 0) {
 403                 qmi_txn_cancel(&txn);
 404                 goto out;
 405         }
 406
 407         ret = qmi_txn_wait(&txn, 5 * HZ);
 408         if (ret < 0) {
 409                 goto out;
 410         } else if (!resp->data_valid ||
 411                    resp->data_len != req->data_len ||
 412                    memcmp(resp->data, req->data, req->data_len)) {
 413                 pr_err("response data doesn't match expectation\n");
 414                 ret = -EINVAL;
 415                 goto out;
 416         }
 417
 418         ret = count;
 419
 420 out:
 421         kfree(resp);
 422         kfree(req);
 423
 424         return ret;
 425 }
 426
 427 static const struct file_operations data_fops = {
 428         .open = simple_open,
 429         .write = data_write,
 430 };
 431
 432 static struct qmi_msg_handler qmi_sample_handlers[] = {
 433         {
 434                 .type = QMI_RESPONSE,
 435                 .msg_id = TEST_PING_REQ_MSG_ID_V01,
 436                 .ei = test_ping_resp_msg_v01_ei,
 437                 .decoded_size = sizeof(struct test_ping_req_msg_v01),
 438                 .fn = ping_pong_cb
 439         },
 440         {}
 441 };
 442
 443 struct qmi_sample {
 444         struct qmi_handle qmi;
 445
 446         struct dentry *de_dir;
 447         struct dentry *de_data;
 448         struct dentry *de_ping;
 449 };
 450
 451 static struct dentry *qmi_debug_dir;
 452
 453 static int qmi_sample_probe(struct platform_device *pdev)
 454 {
 455         struct sockaddr_qrtr *sq;
 456         struct qmi_sample *sample;
 457         char path[20];
 458         int ret;
 459
 460         sample = devm_kzalloc(&pdev->dev, sizeof(*sample), GFP_KERNEL);
 461         if (!sample)
 462                 return -ENOMEM;
 463
 464         ret = qmi_handle_init(&sample->qmi, TEST_DATA_REQ_MAX_MSG_LEN_V01,
 465                               NULL,
 466                               qmi_sample_handlers);
 467         if (ret < 0)
 468                 return ret;
 469
 470         sq = dev_get_platdata(&pdev->dev);
 471         ret = kernel_connect(sample->qmi.sock, (struct sockaddr *)sq,
 472                              sizeof(*sq), 0);
 473         if (ret < 0) {
 474                 pr_err("failed to connect to remote service port\n");
 475                 goto err_release_qmi_handle;
 476         }
 477
 478         snprintf(path, sizeof(path), "%d:%d", sq->sq_node, sq->sq_port);
 479
 480         sample->de_dir = debugfs_create_dir(path, qmi_debug_dir);
 481         if (IS_ERR(sample->de_dir)) {
 482                 ret = PTR_ERR(sample->de_dir);
 483                 goto err_release_qmi_handle;
 484         }
 485
 486         sample->de_data = debugfs_create_file("data", 0600, sample->de_dir,
 487                                               sample, &data_fops);
 488         if (IS_ERR(sample->de_data)) {
 489                 ret = PTR_ERR(sample->de_data);
 490                 goto err_remove_de_dir;
 491         }
 492
 493         sample->de_ping = debugfs_create_file("ping", 0600, sample->de_dir,
 494                                               sample, &ping_fops);
 495         if (IS_ERR(sample->de_ping)) {
 496                 ret = PTR_ERR(sample->de_ping);
 497                 goto err_remove_de_data;
 498         }
 499
 500         platform_set_drvdata(pdev, sample);
 501
 502         return 0;
 503
 504 err_remove_de_data:
 505         debugfs_remove(sample->de_data);
 506 err_remove_de_dir:
 507         debugfs_remove(sample->de_dir);
 508 err_release_qmi_handle:
 509         qmi_handle_release(&sample->qmi);
 510
 511         return ret;
 512 }
 513
 514 static int qmi_sample_remove(struct platform_device *pdev)
 515 {
 516         struct qmi_sample *sample = platform_get_drvdata(pdev);
 517
 518         debugfs_remove(sample->de_ping);
 519         debugfs_remove(sample->de_data);
 520         debugfs_remove(sample->de_dir);
 521
 522         qmi_handle_release(&sample->qmi);
 523
 524         return 0;
 525 }
 526
 527 static struct platform_driver qmi_sample_driver = {
 528         .probe = qmi_sample_probe,
 529         .remove = qmi_sample_remove,
 530         .driver = {
 531                 .name = "qmi_sample_client",
 532         },
 533 };
 534
 535 static int qmi_sample_new_server(struct qmi_handle *qmi,
 536                                  struct qmi_service *service)
 537 {
 538         struct platform_device *pdev;
 539         struct sockaddr_qrtr sq = { AF_QIPCRTR, service->node, service->port };
 540         int ret;
 541
 542         pdev = platform_device_alloc("qmi_sample_client", PLATFORM_DEVID_AUTO);
 543         if (!pdev)
 544                 return -ENOMEM;
 545
 546         ret = platform_device_add_data(pdev, &sq, sizeof(sq));
 547         if (ret)
 548                 goto err_put_device;
 549
 550         ret = platform_device_add(pdev);
 551         if (ret)
 552                 goto err_put_device;
 553
 554         service->priv = pdev;
 555
 556         return 0;
 557
 558 err_put_device:
 559         platform_device_put(pdev);
 560
 561         return ret;
 562 }
 563
 564 static void qmi_sample_del_server(struct qmi_handle *qmi,
 565                                   struct qmi_service *service)
 566 {
 567         struct platform_device *pdev = service->priv;
 568
 569         platform_device_unregister(pdev);
 570 }
 571
 572 static struct qmi_handle lookup_client;
 573
 574 static struct qmi_ops lookup_ops = {
 575         .new_server = qmi_sample_new_server,
 576         .del_server = qmi_sample_del_server,
 577 };
 578
 579 static int qmi_sample_init(void)
 580 {
 581         int ret;
 582
 583         qmi_debug_dir = debugfs_create_dir("qmi_sample", NULL);
 584         if (IS_ERR(qmi_debug_dir)) {
 585                 pr_err("failed to create qmi_sample dir\n");
 586                 return PTR_ERR(qmi_debug_dir);
 587         }
 588
 589         ret = platform_driver_register(&qmi_sample_driver);
 590         if (ret)
 591                 goto err_remove_debug_dir;
 592
 593         ret = qmi_handle_init(&lookup_client, 0, &lookup_ops, NULL);
 594         if (ret < 0)
 595                 goto err_unregister_driver;
 596
 597         qmi_add_lookup(&lookup_client, 15, 0, 0);
 598
 599         return 0;
 600
 601 err_unregister_driver:
 602         platform_driver_unregister(&qmi_sample_driver);
 603 err_remove_debug_dir:
 604         debugfs_remove(qmi_debug_dir);
 605
 606         return ret;
 607 }
 608
 609 static void qmi_sample_exit(void)
 610 {
 611         qmi_handle_release(&lookup_client);
 612
 613         platform_driver_unregister(&qmi_sample_driver);
 614
 615         debugfs_remove(qmi_debug_dir);
 616 }
 617
 618 module_init(qmi_sample_init);
 619 module_exit(qmi_sample_exit);
 620
 621 MODULE_DESCRIPTION("Sample QMI client driver");
 622 MODULE_LICENSE("GPL v2");