2 * Copyright (c) 2015-2016, Linaro Limited
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.
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.
15 #define pr_fmt(fmt) "%s: " fmt, __func__
17 #include <linux/cdev.h>
18 #include <linux/device.h>
20 #include <linux/idr.h>
21 #include <linux/module.h>
22 #include <linux/slab.h>
23 #include <linux/tee_drv.h>
24 #include <linux/uaccess.h>
25 #include "tee_private.h"
27 #define TEE_NUM_DEVICES 32
29 #define TEE_IOCTL_PARAM_SIZE(x) (sizeof(struct tee_param) * (x))
32 * Unprivileged devices in the lower half range and privileged devices in
33 * the upper half range.
35 static DECLARE_BITMAP(dev_mask, TEE_NUM_DEVICES);
36 static DEFINE_SPINLOCK(driver_lock);
38 static struct class *tee_class;
39 static dev_t tee_devt;
41 static struct tee_context *teedev_open(struct tee_device *teedev)
44 struct tee_context *ctx;
46 if (!tee_device_get(teedev))
47 return ERR_PTR(-EINVAL);
49 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
55 kref_init(&ctx->refcount);
57 INIT_LIST_HEAD(&ctx->list_shm);
58 rc = teedev->desc->ops->open(ctx);
65 tee_device_put(teedev);
70 void teedev_ctx_get(struct tee_context *ctx)
75 kref_get(&ctx->refcount);
78 static void teedev_ctx_release(struct kref *ref)
80 struct tee_context *ctx = container_of(ref, struct tee_context,
82 ctx->releasing = true;
83 ctx->teedev->desc->ops->release(ctx);
87 void teedev_ctx_put(struct tee_context *ctx)
92 kref_put(&ctx->refcount, teedev_ctx_release);
95 static void teedev_close_context(struct tee_context *ctx)
97 tee_device_put(ctx->teedev);
101 static int tee_open(struct inode *inode, struct file *filp)
103 struct tee_context *ctx;
105 ctx = teedev_open(container_of(inode->i_cdev, struct tee_device, cdev));
109 filp->private_data = ctx;
113 static int tee_release(struct inode *inode, struct file *filp)
115 teedev_close_context(filp->private_data);
119 static int tee_ioctl_version(struct tee_context *ctx,
120 struct tee_ioctl_version_data __user *uvers)
122 struct tee_ioctl_version_data vers;
124 ctx->teedev->desc->ops->get_version(ctx->teedev, &vers);
126 if (ctx->teedev->desc->flags & TEE_DESC_PRIVILEGED)
127 vers.gen_caps |= TEE_GEN_CAP_PRIVILEGED;
129 if (copy_to_user(uvers, &vers, sizeof(vers)))
135 static int tee_ioctl_shm_alloc(struct tee_context *ctx,
136 struct tee_ioctl_shm_alloc_data __user *udata)
139 struct tee_ioctl_shm_alloc_data data;
142 if (copy_from_user(&data, udata, sizeof(data)))
145 /* Currently no input flags are supported */
149 shm = tee_shm_alloc(ctx, data.size, TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
154 data.flags = shm->flags;
155 data.size = shm->size;
157 if (copy_to_user(udata, &data, sizeof(data)))
160 ret = tee_shm_get_fd(shm);
163 * When user space closes the file descriptor the shared memory
164 * should be freed or if tee_shm_get_fd() failed then it will
165 * be freed immediately.
172 tee_ioctl_shm_register(struct tee_context *ctx,
173 struct tee_ioctl_shm_register_data __user *udata)
176 struct tee_ioctl_shm_register_data data;
179 if (copy_from_user(&data, udata, sizeof(data)))
182 /* Currently no input flags are supported */
186 shm = tee_shm_register(ctx, data.addr, data.length,
187 TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED);
192 data.flags = shm->flags;
193 data.length = shm->size;
195 if (copy_to_user(udata, &data, sizeof(data)))
198 ret = tee_shm_get_fd(shm);
200 * When user space closes the file descriptor the shared memory
201 * should be freed or if tee_shm_get_fd() failed then it will
202 * be freed immediately.
208 static int params_from_user(struct tee_context *ctx, struct tee_param *params,
210 struct tee_ioctl_param __user *uparams)
214 for (n = 0; n < num_params; n++) {
216 struct tee_ioctl_param ip;
218 if (copy_from_user(&ip, uparams + n, sizeof(ip)))
221 /* All unused attribute bits has to be zero */
222 if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
225 params[n].attr = ip.attr;
226 switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
227 case TEE_IOCTL_PARAM_ATTR_TYPE_NONE:
228 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
230 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
231 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
232 params[n].u.value.a = ip.a;
233 params[n].u.value.b = ip.b;
234 params[n].u.value.c = ip.c;
236 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
237 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
238 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
240 * If we fail to get a pointer to a shared memory
241 * object (and increase the ref count) from an
242 * identifier we return an error. All pointers that
243 * has been added in params have an increased ref
244 * count. It's the callers responibility to do
245 * tee_shm_put() on all resolved pointers.
247 shm = tee_shm_get_from_id(ctx, ip.c);
252 * Ensure offset + size does not overflow offset
253 * and does not overflow the size of the referred
254 * shared memory object.
256 if ((ip.a + ip.b) < ip.a ||
257 (ip.a + ip.b) > shm->size) {
262 params[n].u.memref.shm_offs = ip.a;
263 params[n].u.memref.size = ip.b;
264 params[n].u.memref.shm = shm;
267 /* Unknown attribute */
274 static int params_to_user(struct tee_ioctl_param __user *uparams,
275 size_t num_params, struct tee_param *params)
279 for (n = 0; n < num_params; n++) {
280 struct tee_ioctl_param __user *up = uparams + n;
281 struct tee_param *p = params + n;
284 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
285 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
286 if (put_user(p->u.value.a, &up->a) ||
287 put_user(p->u.value.b, &up->b) ||
288 put_user(p->u.value.c, &up->c))
291 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
292 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
293 if (put_user((u64)p->u.memref.size, &up->b))
302 static int tee_ioctl_open_session(struct tee_context *ctx,
303 struct tee_ioctl_buf_data __user *ubuf)
307 struct tee_ioctl_buf_data buf;
308 struct tee_ioctl_open_session_arg __user *uarg;
309 struct tee_ioctl_open_session_arg arg;
310 struct tee_ioctl_param __user *uparams = NULL;
311 struct tee_param *params = NULL;
312 bool have_session = false;
314 if (!ctx->teedev->desc->ops->open_session)
317 if (copy_from_user(&buf, ubuf, sizeof(buf)))
320 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
321 buf.buf_len < sizeof(struct tee_ioctl_open_session_arg))
324 uarg = u64_to_user_ptr(buf.buf_ptr);
325 if (copy_from_user(&arg, uarg, sizeof(arg)))
328 if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
331 if (arg.num_params) {
332 params = kcalloc(arg.num_params, sizeof(struct tee_param),
336 uparams = uarg->params;
337 rc = params_from_user(ctx, params, arg.num_params, uparams);
342 rc = ctx->teedev->desc->ops->open_session(ctx, &arg, params);
347 if (put_user(arg.session, &uarg->session) ||
348 put_user(arg.ret, &uarg->ret) ||
349 put_user(arg.ret_origin, &uarg->ret_origin)) {
353 rc = params_to_user(uparams, arg.num_params, params);
356 * If we've succeeded to open the session but failed to communicate
357 * it back to user space, close the session again to avoid leakage.
359 if (rc && have_session && ctx->teedev->desc->ops->close_session)
360 ctx->teedev->desc->ops->close_session(ctx, arg.session);
363 /* Decrease ref count for all valid shared memory pointers */
364 for (n = 0; n < arg.num_params; n++)
365 if (tee_param_is_memref(params + n) &&
366 params[n].u.memref.shm)
367 tee_shm_put(params[n].u.memref.shm);
374 static int tee_ioctl_invoke(struct tee_context *ctx,
375 struct tee_ioctl_buf_data __user *ubuf)
379 struct tee_ioctl_buf_data buf;
380 struct tee_ioctl_invoke_arg __user *uarg;
381 struct tee_ioctl_invoke_arg arg;
382 struct tee_ioctl_param __user *uparams = NULL;
383 struct tee_param *params = NULL;
385 if (!ctx->teedev->desc->ops->invoke_func)
388 if (copy_from_user(&buf, ubuf, sizeof(buf)))
391 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
392 buf.buf_len < sizeof(struct tee_ioctl_invoke_arg))
395 uarg = u64_to_user_ptr(buf.buf_ptr);
396 if (copy_from_user(&arg, uarg, sizeof(arg)))
399 if (sizeof(arg) + TEE_IOCTL_PARAM_SIZE(arg.num_params) != buf.buf_len)
402 if (arg.num_params) {
403 params = kcalloc(arg.num_params, sizeof(struct tee_param),
407 uparams = uarg->params;
408 rc = params_from_user(ctx, params, arg.num_params, uparams);
413 rc = ctx->teedev->desc->ops->invoke_func(ctx, &arg, params);
417 if (put_user(arg.ret, &uarg->ret) ||
418 put_user(arg.ret_origin, &uarg->ret_origin)) {
422 rc = params_to_user(uparams, arg.num_params, params);
425 /* Decrease ref count for all valid shared memory pointers */
426 for (n = 0; n < arg.num_params; n++)
427 if (tee_param_is_memref(params + n) &&
428 params[n].u.memref.shm)
429 tee_shm_put(params[n].u.memref.shm);
435 static int tee_ioctl_cancel(struct tee_context *ctx,
436 struct tee_ioctl_cancel_arg __user *uarg)
438 struct tee_ioctl_cancel_arg arg;
440 if (!ctx->teedev->desc->ops->cancel_req)
443 if (copy_from_user(&arg, uarg, sizeof(arg)))
446 return ctx->teedev->desc->ops->cancel_req(ctx, arg.cancel_id,
451 tee_ioctl_close_session(struct tee_context *ctx,
452 struct tee_ioctl_close_session_arg __user *uarg)
454 struct tee_ioctl_close_session_arg arg;
456 if (!ctx->teedev->desc->ops->close_session)
459 if (copy_from_user(&arg, uarg, sizeof(arg)))
462 return ctx->teedev->desc->ops->close_session(ctx, arg.session);
465 static int params_to_supp(struct tee_context *ctx,
466 struct tee_ioctl_param __user *uparams,
467 size_t num_params, struct tee_param *params)
471 for (n = 0; n < num_params; n++) {
472 struct tee_ioctl_param ip;
473 struct tee_param *p = params + n;
476 switch (p->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
477 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT:
478 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
483 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT:
484 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
485 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
486 ip.b = p->u.memref.size;
487 if (!p->u.memref.shm) {
489 ip.c = (u64)-1; /* invalid shm id */
492 ip.a = p->u.memref.shm_offs;
493 ip.c = p->u.memref.shm->id;
502 if (copy_to_user(uparams + n, &ip, sizeof(ip)))
509 static int tee_ioctl_supp_recv(struct tee_context *ctx,
510 struct tee_ioctl_buf_data __user *ubuf)
513 struct tee_ioctl_buf_data buf;
514 struct tee_iocl_supp_recv_arg __user *uarg;
515 struct tee_param *params;
519 if (!ctx->teedev->desc->ops->supp_recv)
522 if (copy_from_user(&buf, ubuf, sizeof(buf)))
525 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
526 buf.buf_len < sizeof(struct tee_iocl_supp_recv_arg))
529 uarg = u64_to_user_ptr(buf.buf_ptr);
530 if (get_user(num_params, &uarg->num_params))
533 if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) != buf.buf_len)
536 params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
540 rc = params_from_user(ctx, params, num_params, uarg->params);
544 rc = ctx->teedev->desc->ops->supp_recv(ctx, &func, &num_params, params);
548 if (put_user(func, &uarg->func) ||
549 put_user(num_params, &uarg->num_params)) {
554 rc = params_to_supp(ctx, uarg->params, num_params, params);
560 static int params_from_supp(struct tee_param *params, size_t num_params,
561 struct tee_ioctl_param __user *uparams)
565 for (n = 0; n < num_params; n++) {
566 struct tee_param *p = params + n;
567 struct tee_ioctl_param ip;
569 if (copy_from_user(&ip, uparams + n, sizeof(ip)))
572 /* All unused attribute bits has to be zero */
573 if (ip.attr & ~TEE_IOCTL_PARAM_ATTR_MASK)
577 switch (ip.attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
578 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT:
579 case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT:
580 /* Only out and in/out values can be updated */
585 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT:
586 case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT:
588 * Only the size of the memref can be updated.
589 * Since we don't have access to the original
590 * parameters here, only store the supplied size.
591 * The driver will copy the updated size into the
592 * original parameters.
594 p->u.memref.shm = NULL;
595 p->u.memref.shm_offs = 0;
596 p->u.memref.size = ip.b;
599 memset(&p->u, 0, sizeof(p->u));
606 static int tee_ioctl_supp_send(struct tee_context *ctx,
607 struct tee_ioctl_buf_data __user *ubuf)
610 struct tee_ioctl_buf_data buf;
611 struct tee_iocl_supp_send_arg __user *uarg;
612 struct tee_param *params;
616 /* Not valid for this driver */
617 if (!ctx->teedev->desc->ops->supp_send)
620 if (copy_from_user(&buf, ubuf, sizeof(buf)))
623 if (buf.buf_len > TEE_MAX_ARG_SIZE ||
624 buf.buf_len < sizeof(struct tee_iocl_supp_send_arg))
627 uarg = u64_to_user_ptr(buf.buf_ptr);
628 if (get_user(ret, &uarg->ret) ||
629 get_user(num_params, &uarg->num_params))
632 if (sizeof(*uarg) + TEE_IOCTL_PARAM_SIZE(num_params) > buf.buf_len)
635 params = kcalloc(num_params, sizeof(struct tee_param), GFP_KERNEL);
639 rc = params_from_supp(params, num_params, uarg->params);
643 rc = ctx->teedev->desc->ops->supp_send(ctx, ret, num_params, params);
649 static long tee_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
651 struct tee_context *ctx = filp->private_data;
652 void __user *uarg = (void __user *)arg;
655 case TEE_IOC_VERSION:
656 return tee_ioctl_version(ctx, uarg);
657 case TEE_IOC_SHM_ALLOC:
658 return tee_ioctl_shm_alloc(ctx, uarg);
659 case TEE_IOC_SHM_REGISTER:
660 return tee_ioctl_shm_register(ctx, uarg);
661 case TEE_IOC_OPEN_SESSION:
662 return tee_ioctl_open_session(ctx, uarg);
664 return tee_ioctl_invoke(ctx, uarg);
666 return tee_ioctl_cancel(ctx, uarg);
667 case TEE_IOC_CLOSE_SESSION:
668 return tee_ioctl_close_session(ctx, uarg);
669 case TEE_IOC_SUPPL_RECV:
670 return tee_ioctl_supp_recv(ctx, uarg);
671 case TEE_IOC_SUPPL_SEND:
672 return tee_ioctl_supp_send(ctx, uarg);
678 static const struct file_operations tee_fops = {
679 .owner = THIS_MODULE,
681 .release = tee_release,
682 .unlocked_ioctl = tee_ioctl,
683 .compat_ioctl = tee_ioctl,
686 static void tee_release_device(struct device *dev)
688 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
690 spin_lock(&driver_lock);
691 clear_bit(teedev->id, dev_mask);
692 spin_unlock(&driver_lock);
693 mutex_destroy(&teedev->mutex);
694 idr_destroy(&teedev->idr);
699 * tee_device_alloc() - Allocate a new struct tee_device instance
700 * @teedesc: Descriptor for this driver
701 * @dev: Parent device for this device
702 * @pool: Shared memory pool, NULL if not used
703 * @driver_data: Private driver data for this device
705 * Allocates a new struct tee_device instance. The device is
706 * removed by tee_device_unregister().
708 * @returns a pointer to a 'struct tee_device' or an ERR_PTR on failure
710 struct tee_device *tee_device_alloc(const struct tee_desc *teedesc,
712 struct tee_shm_pool *pool,
715 struct tee_device *teedev;
720 if (!teedesc || !teedesc->name || !teedesc->ops ||
721 !teedesc->ops->get_version || !teedesc->ops->open ||
722 !teedesc->ops->release || !pool)
723 return ERR_PTR(-EINVAL);
725 teedev = kzalloc(sizeof(*teedev), GFP_KERNEL);
727 ret = ERR_PTR(-ENOMEM);
731 max_id = TEE_NUM_DEVICES / 2;
733 if (teedesc->flags & TEE_DESC_PRIVILEGED) {
734 offs = TEE_NUM_DEVICES / 2;
735 max_id = TEE_NUM_DEVICES;
738 spin_lock(&driver_lock);
739 teedev->id = find_next_zero_bit(dev_mask, max_id, offs);
740 if (teedev->id < max_id)
741 set_bit(teedev->id, dev_mask);
742 spin_unlock(&driver_lock);
744 if (teedev->id >= max_id) {
745 ret = ERR_PTR(-ENOMEM);
749 snprintf(teedev->name, sizeof(teedev->name), "tee%s%d",
750 teedesc->flags & TEE_DESC_PRIVILEGED ? "priv" : "",
753 teedev->dev.class = tee_class;
754 teedev->dev.release = tee_release_device;
755 teedev->dev.parent = dev;
757 teedev->dev.devt = MKDEV(MAJOR(tee_devt), teedev->id);
759 rc = dev_set_name(&teedev->dev, "%s", teedev->name);
765 cdev_init(&teedev->cdev, &tee_fops);
766 teedev->cdev.owner = teedesc->owner;
767 teedev->cdev.kobj.parent = &teedev->dev.kobj;
769 dev_set_drvdata(&teedev->dev, driver_data);
770 device_initialize(&teedev->dev);
772 /* 1 as tee_device_unregister() does one final tee_device_put() */
773 teedev->num_users = 1;
774 init_completion(&teedev->c_no_users);
775 mutex_init(&teedev->mutex);
776 idr_init(&teedev->idr);
778 teedev->desc = teedesc;
783 unregister_chrdev_region(teedev->dev.devt, 1);
785 pr_err("could not register %s driver\n",
786 teedesc->flags & TEE_DESC_PRIVILEGED ? "privileged" : "client");
787 if (teedev && teedev->id < TEE_NUM_DEVICES) {
788 spin_lock(&driver_lock);
789 clear_bit(teedev->id, dev_mask);
790 spin_unlock(&driver_lock);
795 EXPORT_SYMBOL_GPL(tee_device_alloc);
797 static ssize_t implementation_id_show(struct device *dev,
798 struct device_attribute *attr, char *buf)
800 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
801 struct tee_ioctl_version_data vers;
803 teedev->desc->ops->get_version(teedev, &vers);
804 return scnprintf(buf, PAGE_SIZE, "%d\n", vers.impl_id);
806 static DEVICE_ATTR_RO(implementation_id);
808 static struct attribute *tee_dev_attrs[] = {
809 &dev_attr_implementation_id.attr,
813 static const struct attribute_group tee_dev_group = {
814 .attrs = tee_dev_attrs,
818 * tee_device_register() - Registers a TEE device
819 * @teedev: Device to register
821 * tee_device_unregister() need to be called to remove the @teedev if
822 * this function fails.
824 * @returns < 0 on failure
826 int tee_device_register(struct tee_device *teedev)
830 if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) {
831 dev_err(&teedev->dev, "attempt to register twice\n");
835 rc = cdev_add(&teedev->cdev, teedev->dev.devt, 1);
837 dev_err(&teedev->dev,
838 "unable to cdev_add() %s, major %d, minor %d, err=%d\n",
839 teedev->name, MAJOR(teedev->dev.devt),
840 MINOR(teedev->dev.devt), rc);
844 rc = device_add(&teedev->dev);
846 dev_err(&teedev->dev,
847 "unable to device_add() %s, major %d, minor %d, err=%d\n",
848 teedev->name, MAJOR(teedev->dev.devt),
849 MINOR(teedev->dev.devt), rc);
853 rc = sysfs_create_group(&teedev->dev.kobj, &tee_dev_group);
855 dev_err(&teedev->dev,
856 "failed to create sysfs attributes, err=%d\n", rc);
857 goto err_sysfs_create_group;
860 teedev->flags |= TEE_DEVICE_FLAG_REGISTERED;
863 err_sysfs_create_group:
864 device_del(&teedev->dev);
866 cdev_del(&teedev->cdev);
869 EXPORT_SYMBOL_GPL(tee_device_register);
871 void tee_device_put(struct tee_device *teedev)
873 mutex_lock(&teedev->mutex);
874 /* Shouldn't put in this state */
875 if (!WARN_ON(!teedev->desc)) {
877 if (!teedev->num_users) {
879 complete(&teedev->c_no_users);
882 mutex_unlock(&teedev->mutex);
885 bool tee_device_get(struct tee_device *teedev)
887 mutex_lock(&teedev->mutex);
889 mutex_unlock(&teedev->mutex);
893 mutex_unlock(&teedev->mutex);
898 * tee_device_unregister() - Removes a TEE device
899 * @teedev: Device to unregister
901 * This function should be called to remove the @teedev even if
902 * tee_device_register() hasn't been called yet. Does nothing if
905 void tee_device_unregister(struct tee_device *teedev)
910 if (teedev->flags & TEE_DEVICE_FLAG_REGISTERED) {
911 sysfs_remove_group(&teedev->dev.kobj, &tee_dev_group);
912 cdev_del(&teedev->cdev);
913 device_del(&teedev->dev);
916 tee_device_put(teedev);
917 wait_for_completion(&teedev->c_no_users);
920 * No need to take a mutex any longer now since teedev->desc was
921 * set to NULL before teedev->c_no_users was completed.
926 put_device(&teedev->dev);
928 EXPORT_SYMBOL_GPL(tee_device_unregister);
931 * tee_get_drvdata() - Return driver_data pointer
932 * @teedev: Device containing the driver_data pointer
933 * @returns the driver_data pointer supplied to tee_register().
935 void *tee_get_drvdata(struct tee_device *teedev)
937 return dev_get_drvdata(&teedev->dev);
939 EXPORT_SYMBOL_GPL(tee_get_drvdata);
941 struct match_dev_data {
942 struct tee_ioctl_version_data *vers;
944 int (*match)(struct tee_ioctl_version_data *, const void *);
947 static int match_dev(struct device *dev, const void *data)
949 const struct match_dev_data *match_data = data;
950 struct tee_device *teedev = container_of(dev, struct tee_device, dev);
952 teedev->desc->ops->get_version(teedev, match_data->vers);
953 return match_data->match(match_data->vers, match_data->data);
957 tee_client_open_context(struct tee_context *start,
958 int (*match)(struct tee_ioctl_version_data *,
960 const void *data, struct tee_ioctl_version_data *vers)
962 struct device *dev = NULL;
963 struct device *put_dev = NULL;
964 struct tee_context *ctx = NULL;
965 struct tee_ioctl_version_data v;
966 struct match_dev_data match_data = { vers ? vers : &v, data, match };
969 dev = &start->teedev->dev;
972 dev = class_find_device(tee_class, dev, &match_data, match_dev);
974 ctx = ERR_PTR(-ENOENT);
981 ctx = teedev_open(container_of(dev, struct tee_device, dev));
982 } while (IS_ERR(ctx) && PTR_ERR(ctx) != -ENOMEM);
987 EXPORT_SYMBOL_GPL(tee_client_open_context);
989 void tee_client_close_context(struct tee_context *ctx)
991 teedev_close_context(ctx);
993 EXPORT_SYMBOL_GPL(tee_client_close_context);
995 void tee_client_get_version(struct tee_context *ctx,
996 struct tee_ioctl_version_data *vers)
998 ctx->teedev->desc->ops->get_version(ctx->teedev, vers);
1000 EXPORT_SYMBOL_GPL(tee_client_get_version);
1002 int tee_client_open_session(struct tee_context *ctx,
1003 struct tee_ioctl_open_session_arg *arg,
1004 struct tee_param *param)
1006 if (!ctx->teedev->desc->ops->open_session)
1008 return ctx->teedev->desc->ops->open_session(ctx, arg, param);
1010 EXPORT_SYMBOL_GPL(tee_client_open_session);
1012 int tee_client_close_session(struct tee_context *ctx, u32 session)
1014 if (!ctx->teedev->desc->ops->close_session)
1016 return ctx->teedev->desc->ops->close_session(ctx, session);
1018 EXPORT_SYMBOL_GPL(tee_client_close_session);
1020 int tee_client_invoke_func(struct tee_context *ctx,
1021 struct tee_ioctl_invoke_arg *arg,
1022 struct tee_param *param)
1024 if (!ctx->teedev->desc->ops->invoke_func)
1026 return ctx->teedev->desc->ops->invoke_func(ctx, arg, param);
1028 EXPORT_SYMBOL_GPL(tee_client_invoke_func);
1030 static int __init tee_init(void)
1034 tee_class = class_create(THIS_MODULE, "tee");
1035 if (IS_ERR(tee_class)) {
1036 pr_err("couldn't create class\n");
1037 return PTR_ERR(tee_class);
1040 rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee");
1042 pr_err("failed to allocate char dev region\n");
1043 class_destroy(tee_class);
1050 static void __exit tee_exit(void)
1052 class_destroy(tee_class);
1054 unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES);
1057 subsys_initcall(tee_init);
1058 module_exit(tee_exit);
1060 MODULE_AUTHOR("Linaro");
1061 MODULE_DESCRIPTION("TEE Driver");
1062 MODULE_VERSION("1.0");
1063 MODULE_LICENSE("GPL v2");