drivers/tee/optee/core.c

   1 /*
   2  * Copyright (c) 2015, Linaro Limited
   3  *
   4  * This software is licensed under the terms of the GNU General Public
   5  * License version 2, as published by the Free Software Foundation, and
   6  * may be copied, distributed, and modified under those terms.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  16
  17 #include <linux/arm-smccc.h>
  18 #include <linux/errno.h>
  19 #include <linux/io.h>
  20 #include <linux/module.h>
  21 #include <linux/of.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/slab.h>
  25 #include <linux/string.h>
  26 #include <linux/tee_drv.h>
  27 #include <linux/types.h>
  28 #include <linux/uaccess.h>
  29 #include "optee_private.h"
  30 #include "optee_smc.h"
  31
  32 #define DRIVER_NAME "optee"
  33
  34 #define OPTEE_SHM_NUM_PRIV_PAGES        1
  35
  36 /**
  37  * optee_from_msg_param() - convert from OPTEE_MSG parameters to
  38  *                          struct tee_param
  39  * @params:     subsystem internal parameter representation
  40  * @num_params: number of elements in the parameter arrays
  41  * @msg_params: OPTEE_MSG parameters
  42  * Returns 0 on success or <0 on failure
  43  */
  44 int optee_from_msg_param(struct tee_param *params, size_t num_params,
  45                          const struct optee_msg_param *msg_params)
  46 {
  47         int rc;
  48         size_t n;
  49         struct tee_shm *shm;
  50         phys_addr_t pa;
  51
  52         for (n = 0; n < num_params; n++) {
  53                 struct tee_param *p = params + n;
  54                 const struct optee_msg_param *mp = msg_params + n;
  55                 u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK;
  56
  57                 switch (attr) {
  58                 case OPTEE_MSG_ATTR_TYPE_NONE:
  59                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
  60                         memset(&p->u, 0, sizeof(p->u));
  61                         break;
  62                 case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT:
  63                 case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT:
  64                 case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT:
  65                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT +
  66                                   attr - OPTEE_MSG_ATTR_TYPE_VALUE_INPUT;
  67                         p->u.value.a = mp->u.value.a;
  68                         p->u.value.b = mp->u.value.b;
  69                         p->u.value.c = mp->u.value.c;
  70                         break;
  71                 case OPTEE_MSG_ATTR_TYPE_TMEM_INPUT:
  72                 case OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT:
  73                 case OPTEE_MSG_ATTR_TYPE_TMEM_INOUT:
  74                         p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT +
  75                                   attr - OPTEE_MSG_ATTR_TYPE_TMEM_INPUT;
  76                         p->u.memref.size = mp->u.tmem.size;
  77                         shm = (struct tee_shm *)(unsigned long)
  78                                 mp->u.tmem.shm_ref;
  79                         if (!shm) {
  80                                 p->u.memref.shm_offs = 0;
  81                                 p->u.memref.shm = NULL;
  82                                 break;
  83                         }
  84                         rc = tee_shm_get_pa(shm, 0, &pa);
  85                         if (rc)
  86                                 return rc;
  87                         p->u.memref.shm_offs = mp->u.tmem.buf_ptr - pa;
  88                         p->u.memref.shm = shm;
  89
  90                         /* Check that the memref is covered by the shm object */
  91                         if (p->u.memref.size) {
  92                                 size_t o = p->u.memref.shm_offs +
  93                                            p->u.memref.size - 1;
  94
  95                                 rc = tee_shm_get_pa(shm, o, NULL);
  96                                 if (rc)
  97                                         return rc;
  98                         }
  99                         break;
 100                 default:
 101                         return -EINVAL;
 102                 }
 103         }
 104         return 0;
 105 }
 106
 107 /**
 108  * optee_to_msg_param() - convert from struct tee_params to OPTEE_MSG parameters
 109  * @msg_params: OPTEE_MSG parameters
 110  * @num_params: number of elements in the parameter arrays
 111  * @params:     subsystem itnernal parameter representation
 112  * Returns 0 on success or <0 on failure
 113  */
 114 int optee_to_msg_param(struct optee_msg_param *msg_params, size_t num_params,
 115                        const struct tee_param *params)
 116 {
 117         int rc;
 118         size_t n;
 119         phys_addr_t pa;
 120
 121         for (n = 0; n < num_params; n++) {
 122                 const struct tee_param *p = params + n;
 123                 struct optee_msg_param *mp = msg_params + n;
 124
 125                 switch (p->attr) {
 126                 case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
 127                         mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE;
 128                         memset(&mp->u, 0, sizeof(mp->u));
 129                         break;
 130                 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
 131                 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
 132                 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
 133                         mp->attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT + p->attr -
 134                                    TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;
 135                         mp->u.value.a = p->u.value.a;
 136                         mp->u.value.b = p->u.value.b;
 137                         mp->u.value.c = p->u.value.c;
 138                         break;
 139                 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
 140                 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
 141                 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
 142                         mp->attr = OPTEE_MSG_ATTR_TYPE_TMEM_INPUT +
 143                                    p->attr -
 144                                    TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT;
 145                         mp->u.tmem.shm_ref = (unsigned long)p->u.memref.shm;
 146                         mp->u.tmem.size = p->u.memref.size;
 147                         if (!p->u.memref.shm) {
 148                                 mp->u.tmem.buf_ptr = 0;
 149                                 break;
 150                         }
 151                         rc = tee_shm_get_pa(p->u.memref.shm,
 152                                             p->u.memref.shm_offs, &pa);
 153                         if (rc)
 154                                 return rc;
 155                         mp->u.tmem.buf_ptr = pa;
 156                         mp->attr |= OPTEE_MSG_ATTR_CACHE_PREDEFINED <<
 157                                         OPTEE_MSG_ATTR_CACHE_SHIFT;
 158                         break;
 159                 default:
 160                         return -EINVAL;
 161                 }
 162         }
 163         return 0;
 164 }
 165
 166 static void optee_get_version(struct tee_device *teedev,
 167                               struct tee_ioctl_version_data *vers)
 168 {
 169         struct tee_ioctl_version_data v = {
 170                 .impl_id = TEE_IMPL_ID_OPTEE,
 171                 .impl_caps = TEE_OPTEE_CAP_TZ,
 172                 .gen_caps = TEE_GEN_CAP_GP,
 173         };
 174         *vers = v;
 175 }
 176
 177 static int optee_open(struct tee_context *ctx)
 178 {
 179         struct optee_context_data *ctxdata;
 180         struct tee_device *teedev = ctx->teedev;
 181         struct optee *optee = tee_get_drvdata(teedev);
 182
 183         ctxdata = kzalloc(sizeof(*ctxdata), GFP_KERNEL);
 184         if (!ctxdata)
 185                 return -ENOMEM;
 186
 187         if (teedev == optee->supp_teedev) {
 188                 bool busy = true;
 189
 190                 mutex_lock(&optee->supp.ctx_mutex);
 191                 if (!optee->supp.ctx) {
 192                         busy = false;
 193                         optee->supp.ctx = ctx;
 194                 }
 195                 mutex_unlock(&optee->supp.ctx_mutex);
 196                 if (busy) {
 197                         kfree(ctxdata);
 198                         return -EBUSY;
 199                 }
 200         }
 201
 202         mutex_init(&ctxdata->mutex);
 203         INIT_LIST_HEAD(&ctxdata->sess_list);
 204
 205         ctx->data = ctxdata;
 206         return 0;
 207 }
 208
 209 static void optee_release(struct tee_context *ctx)
 210 {
 211         struct optee_context_data *ctxdata = ctx->data;
 212         struct tee_device *teedev = ctx->teedev;
 213         struct optee *optee = tee_get_drvdata(teedev);
 214         struct tee_shm *shm;
 215         struct optee_msg_arg *arg = NULL;
 216         phys_addr_t parg;
 217         struct optee_session *sess;
 218         struct optee_session *sess_tmp;
 219
 220         if (!ctxdata)
 221                 return;
 222
 223         shm = tee_shm_alloc(ctx, sizeof(struct optee_msg_arg), TEE_SHM_MAPPED);
 224         if (!IS_ERR(shm)) {
 225                 arg = tee_shm_get_va(shm, 0);
 226                 /*
 227                  * If va2pa fails for some reason, we can't call into
 228                  * secure world, only free the memory. Secure OS will leak
 229                  * sessions and finally refuse more sessions, but we will
 230                  * at least let normal world reclaim its memory.
 231                  */
 232                 if (!IS_ERR(arg))
 233                         if (tee_shm_va2pa(shm, arg, &parg))
 234                                 arg = NULL; /* prevent usage of parg below */
 235         }
 236
 237         list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
 238                                  list_node) {
 239                 list_del(&sess->list_node);
 240                 if (!IS_ERR_OR_NULL(arg)) {
 241                         memset(arg, 0, sizeof(*arg));
 242                         arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
 243                         arg->session = sess->session_id;
 244                         optee_do_call_with_arg(ctx, parg);
 245                 }
 246                 kfree(sess);
 247         }
 248         kfree(ctxdata);
 249
 250         if (!IS_ERR(shm))
 251                 tee_shm_free(shm);
 252
 253         ctx->data = NULL;
 254
 255         if (teedev == optee->supp_teedev) {
 256                 mutex_lock(&optee->supp.ctx_mutex);
 257                 optee->supp.ctx = NULL;
 258                 mutex_unlock(&optee->supp.ctx_mutex);
 259         }
 260 }
 261
 262 static const struct tee_driver_ops optee_ops = {
 263         .get_version = optee_get_version,
 264         .open = optee_open,
 265         .release = optee_release,
 266         .open_session = optee_open_session,
 267         .close_session = optee_close_session,
 268         .invoke_func = optee_invoke_func,
 269         .cancel_req = optee_cancel_req,
 270 };
 271
 272 static const struct tee_desc optee_desc = {
 273         .name = DRIVER_NAME "-clnt",
 274         .ops = &optee_ops,
 275         .owner = THIS_MODULE,
 276 };
 277
 278 static const struct tee_driver_ops optee_supp_ops = {
 279         .get_version = optee_get_version,
 280         .open = optee_open,
 281         .release = optee_release,
 282         .supp_recv = optee_supp_recv,
 283         .supp_send = optee_supp_send,
 284 };
 285
 286 static const struct tee_desc optee_supp_desc = {
 287         .name = DRIVER_NAME "-supp",
 288         .ops = &optee_supp_ops,
 289         .owner = THIS_MODULE,
 290         .flags = TEE_DESC_PRIVILEGED,
 291 };
 292
 293 static bool optee_msg_api_uid_is_optee_api(optee_invoke_fn *invoke_fn)
 294 {
 295         struct arm_smccc_res res;
 296
 297         invoke_fn(OPTEE_SMC_CALLS_UID, 0, 0, 0, 0, 0, 0, 0, &res);
 298
 299         if (res.a0 == OPTEE_MSG_UID_0 && res.a1 == OPTEE_MSG_UID_1 &&
 300             res.a2 == OPTEE_MSG_UID_2 && res.a3 == OPTEE_MSG_UID_3)
 301                 return true;
 302         return false;
 303 }
 304
 305 static bool optee_msg_api_revision_is_compatible(optee_invoke_fn *invoke_fn)
 306 {
 307         union {
 308                 struct arm_smccc_res smccc;
 309                 struct optee_smc_calls_revision_result result;
 310         } res;
 311
 312         invoke_fn(OPTEE_SMC_CALLS_REVISION, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
 313
 314         if (res.result.major == OPTEE_MSG_REVISION_MAJOR &&
 315             (int)res.result.minor >= OPTEE_MSG_REVISION_MINOR)
 316                 return true;
 317         return false;
 318 }
 319
 320 static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
 321                                             u32 *sec_caps)
 322 {
 323         union {
 324                 struct arm_smccc_res smccc;
 325                 struct optee_smc_exchange_capabilities_result result;
 326         } res;
 327         u32 a1 = 0;
 328
 329         /*
 330          * TODO This isn't enough to tell if it's UP system (from kernel
 331          * point of view) or not, is_smp() returns the the information
 332          * needed, but can't be called directly from here.
 333          */
 334         if (!IS_ENABLED(CONFIG_SMP) || nr_cpu_ids == 1)
 335                 a1 |= OPTEE_SMC_NSEC_CAP_UNIPROCESSOR;
 336
 337         invoke_fn(OPTEE_SMC_EXCHANGE_CAPABILITIES, a1, 0, 0, 0, 0, 0, 0,
 338                   &res.smccc);
 339
 340         if (res.result.status != OPTEE_SMC_RETURN_OK)
 341                 return false;
 342
 343         *sec_caps = res.result.capabilities;
 344         return true;
 345 }
 346
 347 static struct tee_shm_pool *
 348 optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
 349 {
 350         union {
 351                 struct arm_smccc_res smccc;
 352                 struct optee_smc_get_shm_config_result result;
 353         } res;
 354         struct tee_shm_pool *pool;
 355         unsigned long vaddr;
 356         phys_addr_t paddr;
 357         size_t size;
 358         phys_addr_t begin;
 359         phys_addr_t end;
 360         void *va;
 361         struct tee_shm_pool_mem_info priv_info;
 362         struct tee_shm_pool_mem_info dmabuf_info;
 363
 364         invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
 365         if (res.result.status != OPTEE_SMC_RETURN_OK) {
 366                 pr_info("shm service not available\n");
 367                 return ERR_PTR(-ENOENT);
 368         }
 369
 370         if (res.result.settings != OPTEE_SMC_SHM_CACHED) {
 371                 pr_err("only normal cached shared memory supported\n");
 372                 return ERR_PTR(-EINVAL);
 373         }
 374
 375         begin = roundup(res.result.start, PAGE_SIZE);
 376         end = rounddown(res.result.start + res.result.size, PAGE_SIZE);
 377         paddr = begin;
 378         size = end - begin;
 379
 380         if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
 381                 pr_err("too small shared memory area\n");
 382                 return ERR_PTR(-EINVAL);
 383         }
 384
 385         va = memremap(paddr, size, MEMREMAP_WB);
 386         if (!va) {
 387                 pr_err("shared memory ioremap failed\n");
 388                 return ERR_PTR(-EINVAL);
 389         }
 390         vaddr = (unsigned long)va;
 391
 392         priv_info.vaddr = vaddr;
 393         priv_info.paddr = paddr;
 394         priv_info.size = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
 395         dmabuf_info.vaddr = vaddr + OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
 396         dmabuf_info.paddr = paddr + OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
 397         dmabuf_info.size = size - OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
 398
 399         pool = tee_shm_pool_alloc_res_mem(&priv_info, &dmabuf_info);
 400         if (IS_ERR(pool)) {
 401                 memunmap(va);
 402                 goto out;
 403         }
 404
 405         *memremaped_shm = va;
 406 out:
 407         return pool;
 408 }
 409
 410 /* Simple wrapper functions to be able to use a function pointer */
 411 static void optee_smccc_smc(unsigned long a0, unsigned long a1,
 412                             unsigned long a2, unsigned long a3,
 413                             unsigned long a4, unsigned long a5,
 414                             unsigned long a6, unsigned long a7,
 415                             struct arm_smccc_res *res)
 416 {
 417         arm_smccc_smc(a0, a1, a2, a3, a4, a5, a6, a7, res);
 418 }
 419
 420 static void optee_smccc_hvc(unsigned long a0, unsigned long a1,
 421                             unsigned long a2, unsigned long a3,
 422                             unsigned long a4, unsigned long a5,
 423                             unsigned long a6, unsigned long a7,
 424                             struct arm_smccc_res *res)
 425 {
 426         arm_smccc_hvc(a0, a1, a2, a3, a4, a5, a6, a7, res);
 427 }
 428
 429 static optee_invoke_fn *get_invoke_func(struct device_node *np)
 430 {
 431         const char *method;
 432
 433         pr_info("probing for conduit method from DT.\n");
 434
 435         if (of_property_read_string(np, "method", &method)) {
 436                 pr_warn("missing \"method\" property\n");
 437                 return ERR_PTR(-ENXIO);
 438         }
 439
 440         if (!strcmp("hvc", method))
 441                 return optee_smccc_hvc;
 442         else if (!strcmp("smc", method))
 443                 return optee_smccc_smc;
 444
 445         pr_warn("invalid \"method\" property: %s\n", method);
 446         return ERR_PTR(-EINVAL);
 447 }
 448
 449 static struct optee *optee_probe(struct device_node *np)
 450 {
 451         optee_invoke_fn *invoke_fn;
 452         struct tee_shm_pool *pool;
 453         struct optee *optee = NULL;
 454         void *memremaped_shm = NULL;
 455         struct tee_device *teedev;
 456         u32 sec_caps;
 457         int rc;
 458
 459         invoke_fn = get_invoke_func(np);
 460         if (IS_ERR(invoke_fn))
 461                 return (void *)invoke_fn;
 462
 463         if (!optee_msg_api_uid_is_optee_api(invoke_fn)) {
 464                 pr_warn("api uid mismatch\n");
 465                 return ERR_PTR(-EINVAL);
 466         }
 467
 468         if (!optee_msg_api_revision_is_compatible(invoke_fn)) {
 469                 pr_warn("api revision mismatch\n");
 470                 return ERR_PTR(-EINVAL);
 471         }
 472
 473         if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps)) {
 474                 pr_warn("capabilities mismatch\n");
 475                 return ERR_PTR(-EINVAL);
 476         }
 477
 478         /*
 479          * We have no other option for shared memory, if secure world
 480          * doesn't have any reserved memory we can use we can't continue.
 481          */
 482         if (!(sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
 483                 return ERR_PTR(-EINVAL);
 484
 485         pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);
 486         if (IS_ERR(pool))
 487                 return (void *)pool;
 488
 489         optee = kzalloc(sizeof(*optee), GFP_KERNEL);
 490         if (!optee) {
 491                 rc = -ENOMEM;
 492                 goto err;
 493         }
 494
 495         optee->invoke_fn = invoke_fn;
 496
 497         teedev = tee_device_alloc(&optee_desc, NULL, pool, optee);
 498         if (IS_ERR(teedev)) {
 499                 rc = PTR_ERR(teedev);
 500                 goto err;
 501         }
 502         optee->teedev = teedev;
 503
 504         teedev = tee_device_alloc(&optee_supp_desc, NULL, pool, optee);
 505         if (IS_ERR(teedev)) {
 506                 rc = PTR_ERR(teedev);
 507                 goto err;
 508         }
 509         optee->supp_teedev = teedev;
 510
 511         rc = tee_device_register(optee->teedev);
 512         if (rc)
 513                 goto err;
 514
 515         rc = tee_device_register(optee->supp_teedev);
 516         if (rc)
 517                 goto err;
 518
 519         mutex_init(&optee->call_queue.mutex);
 520         INIT_LIST_HEAD(&optee->call_queue.waiters);
 521         optee_wait_queue_init(&optee->wait_queue);
 522         optee_supp_init(&optee->supp);
 523         optee->memremaped_shm = memremaped_shm;
 524         optee->pool = pool;
 525
 526         optee_enable_shm_cache(optee);
 527
 528         pr_info("initialized driver\n");
 529         return optee;
 530 err:
 531         if (optee) {
 532                 /*
 533                  * tee_device_unregister() is safe to call even if the
 534                  * devices hasn't been registered with
 535                  * tee_device_register() yet.
 536                  */
 537                 tee_device_unregister(optee->supp_teedev);
 538                 tee_device_unregister(optee->teedev);
 539                 kfree(optee);
 540         }
 541         if (pool)
 542                 tee_shm_pool_free(pool);
 543         if (memremaped_shm)
 544                 memunmap(memremaped_shm);
 545         return ERR_PTR(rc);
 546 }
 547
 548 static void optee_remove(struct optee *optee)
 549 {
 550         /*
 551          * Ask OP-TEE to free all cached shared memory objects to decrease
 552          * reference counters and also avoid wild pointers in secure world
 553          * into the old shared memory range.
 554          */
 555         optee_disable_shm_cache(optee);
 556
 557         /*
 558          * The two devices has to be unregistered before we can free the
 559          * other resources.
 560          */
 561         tee_device_unregister(optee->supp_teedev);
 562         tee_device_unregister(optee->teedev);
 563
 564         tee_shm_pool_free(optee->pool);
 565         if (optee->memremaped_shm)
 566                 memunmap(optee->memremaped_shm);
 567         optee_wait_queue_exit(&optee->wait_queue);
 568         optee_supp_uninit(&optee->supp);
 569         mutex_destroy(&optee->call_queue.mutex);
 570
 571         kfree(optee);
 572 }
 573
 574 static const struct of_device_id optee_match[] = {
 575         { .compatible = "linaro,optee-tz" },
 576         {},
 577 };
 578
 579 static struct optee *optee_svc;
 580
 581 static int __init optee_driver_init(void)
 582 {
 583         struct device_node *fw_np;
 584         struct device_node *np;
 585         struct optee *optee;
 586
 587         /* Node is supposed to be below /firmware */
 588         fw_np = of_find_node_by_name(NULL, "firmware");
 589         if (!fw_np)
 590                 return -ENODEV;
 591
 592         np = of_find_matching_node(fw_np, optee_match);
 593         if (!np)
 594                 return -ENODEV;
 595
 596         optee = optee_probe(np);
 597         of_node_put(np);
 598
 599         if (IS_ERR(optee))
 600                 return PTR_ERR(optee);
 601
 602         optee_svc = optee;
 603
 604         return 0;
 605 }
 606 module_init(optee_driver_init);
 607
 608 static void __exit optee_driver_exit(void)
 609 {
 610         struct optee *optee = optee_svc;
 611
 612         optee_svc = NULL;
 613         if (optee)
 614                 optee_remove(optee);
 615 }
 616 module_exit(optee_driver_exit);
 617
 618 MODULE_AUTHOR("Linaro");
 619 MODULE_DESCRIPTION("OP-TEE driver");
 620 MODULE_SUPPORTED_DEVICE("");
 621 MODULE_VERSION("1.0");
 622 MODULE_LICENSE("GPL v2");