1 // SPDX-License-Identifier: GPL-2.0-only
13  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
39 	if (!chip->ops->request_locality)  in tpm_request_locality()
42 	rc = chip->ops->request_locality(chip, 0);  in tpm_request_locality()
46 	chip->locality = rc;  in tpm_request_locality()
54 	if (!chip->ops->relinquish_locality)  in tpm_relinquish_locality()
57 	rc = chip->ops->relinquish_locality(chip, chip->locality);  in tpm_relinquish_locality()
59 		dev_err(&chip->dev, "%s: : error %d\n", __func__, rc);  in tpm_relinquish_locality()
61 	chip->locality = -1;  in tpm_relinquish_locality()
66 	if (!chip->ops->cmd_ready)  in tpm_cmd_ready()
69 	return chip->ops->cmd_ready(chip);  in tpm_cmd_ready()
74 	if (!chip->ops->go_idle)  in tpm_go_idle()
77 	return chip->ops->go_idle(chip);  in tpm_go_idle()
82 	if (chip->ops->clk_enable)  in tpm_clk_enable()
83 		chip->ops->clk_enable(chip, true);  in tpm_clk_enable()
88 	if (chip->ops->clk_enable)  in tpm_clk_disable()
89 		chip->ops->clk_enable(chip, false);  in tpm_clk_disable()
93  * tpm_chip_start() - power on the TPM
97  * * The response length	- OK
98  * * -errno			- A system error
106 	if (chip->locality == -1) {  in tpm_chip_start()
126  * tpm_chip_stop() - power off the TPM
130  * * The response length	- OK
131  * * -errno			- A system error
142  * tpm_try_get_ops() - Get a ref to the tpm_chip
150  * Returns -ERRNO if the chip could not be got.
154 	int rc = -EIO;  in tpm_try_get_ops()
156 	get_device(&chip->dev);  in tpm_try_get_ops()
158 	down_read(&chip->ops_sem);  in tpm_try_get_ops()
159 	if (!chip->ops)  in tpm_try_get_ops()
162 	mutex_lock(&chip->tpm_mutex);  in tpm_try_get_ops()
169 	mutex_unlock(&chip->tpm_mutex);  in tpm_try_get_ops()
171 	up_read(&chip->ops_sem);  in tpm_try_get_ops()
172 	put_device(&chip->dev);  in tpm_try_get_ops()
178  * tpm_put_ops() - Release a ref to the tpm_chip
187 	mutex_unlock(&chip->tpm_mutex);  in tpm_put_ops()
188 	up_read(&chip->ops_sem);  in tpm_put_ops()
189 	put_device(&chip->dev);  in tpm_put_ops()
194  * tpm_default_chip() - find a TPM chip and get a reference to it
208 			get_device(&chip->dev);  in tpm_default_chip()
221  * tpm_find_get_ops() - find and reserve a TPM chip
250 	put_device(&chip->dev);  in tpm_find_get_ops()
257  * tpm_dev_release() - free chip memory and the device number
267 	idr_remove(&dev_nums_idr, chip->dev_num);  in tpm_dev_release()
270 	kfree(chip->work_space.context_buf);  in tpm_dev_release()
271 	kfree(chip->work_space.session_buf);  in tpm_dev_release()
272 	kfree(chip->allocated_banks);  in tpm_dev_release()
277  * tpm_class_shutdown() - prepare the TPM device for loss of power.
281  * TPM 2.0 spec. Then, calls bus- and device- specific shutdown code.
289 	down_write(&chip->ops_sem);  in tpm_class_shutdown()
290 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in tpm_class_shutdown()
296 	chip->ops = NULL;  in tpm_class_shutdown()
297 	up_write(&chip->ops_sem);  in tpm_class_shutdown()
303  * tpm_chip_alloc() - allocate a new struct tpm_chip instance
310  * device number for it. Must be paired with put_device(&chip->dev).
320 		return ERR_PTR(-ENOMEM);  in tpm_chip_alloc()
322 	mutex_init(&chip->tpm_mutex);  in tpm_chip_alloc()
323 	init_rwsem(&chip->ops_sem);  in tpm_chip_alloc()
325 	chip->ops = ops;  in tpm_chip_alloc()
335 	chip->dev_num = rc;  in tpm_chip_alloc()
337 	device_initialize(&chip->dev);  in tpm_chip_alloc()
339 	chip->dev.class = tpm_class;  in tpm_chip_alloc()
340 	chip->dev.class->shutdown_pre = tpm_class_shutdown;  in tpm_chip_alloc()
341 	chip->dev.release = tpm_dev_release;  in tpm_chip_alloc()
342 	chip->dev.parent = pdev;  in tpm_chip_alloc()
343 	chip->dev.groups = chip->groups;  in tpm_chip_alloc()
345 	if (chip->dev_num == 0)  in tpm_chip_alloc()
346 		chip->dev.devt = MKDEV(MISC_MAJOR, TPM_MINOR);  in tpm_chip_alloc()
348 		chip->dev.devt = MKDEV(MAJOR(tpm_devt), chip->dev_num);  in tpm_chip_alloc()
350 	rc = dev_set_name(&chip->dev, "tpm%d", chip->dev_num);  in tpm_chip_alloc()
355 		chip->flags |= TPM_CHIP_FLAG_VIRTUAL;  in tpm_chip_alloc()
357 	cdev_init(&chip->cdev, &tpm_fops);  in tpm_chip_alloc()
358 	chip->cdev.owner = THIS_MODULE;  in tpm_chip_alloc()
360 	rc = tpm2_init_space(&chip->work_space, TPM2_SPACE_BUFFER_SIZE);  in tpm_chip_alloc()
362 		rc = -ENOMEM;  in tpm_chip_alloc()
366 	chip->locality = -1;  in tpm_chip_alloc()
370 	put_device(&chip->dev);  in tpm_chip_alloc()
376  * tpmm_chip_alloc() - allocate a new struct tpm_chip instance
394 				      &chip->dev);  in tpmm_chip_alloc()
408 	rc = cdev_device_add(&chip->cdev, &chip->dev);  in tpm_add_char_device()
410 		dev_err(&chip->dev,  in tpm_add_char_device()
412 			dev_name(&chip->dev), MAJOR(chip->dev.devt),  in tpm_add_char_device()
413 			MINOR(chip->dev.devt), rc);  in tpm_add_char_device()
417 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in tpm_add_char_device()
425 	idr_replace(&dev_nums_idr, chip, chip->dev_num);  in tpm_add_char_device()
431 	cdev_device_del(&chip->cdev, &chip->dev);  in tpm_add_char_device()
437 	cdev_device_del(&chip->cdev, &chip->dev);  in tpm_del_char_device()
441 	idr_replace(&dev_nums_idr, NULL, chip->dev_num);  in tpm_del_char_device()
445 	down_write(&chip->ops_sem);  in tpm_del_char_device()
446 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in tpm_del_char_device()
452 	chip->ops = NULL;  in tpm_del_char_device()
453 	up_write(&chip->ops_sem);  in tpm_del_char_device()
460 	if (chip->flags & (TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_VIRTUAL))  in tpm_del_legacy_sysfs()
463 	sysfs_remove_link(&chip->dev.parent->kobj, "ppi");  in tpm_del_legacy_sysfs()
465 	for (i = chip->groups[0]->attrs; *i != NULL; ++i)  in tpm_del_legacy_sysfs()
466 		sysfs_remove_link(&chip->dev.parent->kobj, (*i)->name);  in tpm_del_legacy_sysfs()
478 	if (chip->flags & (TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_VIRTUAL))  in tpm_add_legacy_sysfs()
482 		    &chip->dev.parent->kobj, &chip->dev.kobj, "ppi", NULL);  in tpm_add_legacy_sysfs()
483 	if (rc && rc != -ENOENT)  in tpm_add_legacy_sysfs()
486 	/* All the names from tpm-sysfs */  in tpm_add_legacy_sysfs()
487 	for (i = chip->groups[0]->attrs; *i != NULL; ++i) {  in tpm_add_legacy_sysfs()
489 		    &chip->dev.parent->kobj, &chip->dev.kobj, (*i)->name, NULL);  in tpm_add_legacy_sysfs()
511 	snprintf(chip->hwrng_name, sizeof(chip->hwrng_name),  in tpm_add_hwrng()
512 		 "tpm-rng-%d", chip->dev_num);  in tpm_add_hwrng()
513 	chip->hwrng.name = chip->hwrng_name;  in tpm_add_hwrng()
514 	chip->hwrng.read = tpm_hwrng_read;  in tpm_add_hwrng()
515 	return hwrng_register(&chip->hwrng);  in tpm_add_hwrng()
522 	rc = (chip->flags & TPM_CHIP_FLAG_TPM2) ?  in tpm_get_pcr_allocation()
527 		return -ENODEV;  in tpm_get_pcr_allocation()
533  * tpm_chip_register() - create a character device for the TPM chip
538  * chips available for in-kernel use.
585 		hwrng_unregister(&chip->hwrng);  in tpm_chip_register()
594  * tpm_chip_unregister() - release the TPM driver
610 		hwrng_unregister(&chip->hwrng);  in tpm_chip_unregister()
612 	if (chip->flags & TPM_CHIP_FLAG_TPM2)  in tpm_chip_unregister()