1 // SPDX-License-Identifier: GPL-2.0-only
13  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
44 	if (!chip->ops->request_locality)  in tpm_request_locality()
47 	rc = chip->ops->request_locality(chip, 0);  in tpm_request_locality()
51 	chip->locality = rc;  in tpm_request_locality()
59 	if (!chip->ops->relinquish_locality)  in tpm_relinquish_locality()
62 	rc = chip->ops->relinquish_locality(chip, chip->locality);  in tpm_relinquish_locality()
64 		dev_err(&chip->dev, "%s: : error %d\n", __func__, rc);  in tpm_relinquish_locality()
66 	chip->locality = -1;  in tpm_relinquish_locality()
71 	if (!chip->ops->cmd_ready)  in tpm_cmd_ready()
74 	return chip->ops->cmd_ready(chip);  in tpm_cmd_ready()
79 	if (!chip->ops->go_idle)  in tpm_go_idle()
82 	return chip->ops->go_idle(chip);  in tpm_go_idle()
87 	if (chip->ops->clk_enable)  in tpm_clk_enable()
88 		chip->ops->clk_enable(chip, true);  in tpm_clk_enable()
93 	if (chip->ops->clk_enable)  in tpm_clk_disable()
94 		chip->ops->clk_enable(chip, false);  in tpm_clk_disable()
98  * tpm_chip_start() - power on the TPM
102  * * The response length	- OK
103  * * -errno			- A system error
111 	if (chip->locality == -1) {  in tpm_chip_start()
131  * tpm_chip_stop() - power off the TPM
135  * * The response length	- OK
136  * * -errno			- A system error
147  * tpm_try_get_ops() - Get a ref to the tpm_chip
155  * Returns -ERRNO if the chip could not be got.
159 	int rc = -EIO;  in tpm_try_get_ops()
161 	get_device(&chip->dev);  in tpm_try_get_ops()
163 	down_read(&chip->ops_sem);  in tpm_try_get_ops()
164 	if (!chip->ops)  in tpm_try_get_ops()
167 	mutex_lock(&chip->tpm_mutex);  in tpm_try_get_ops()
174 	mutex_unlock(&chip->tpm_mutex);  in tpm_try_get_ops()
176 	up_read(&chip->ops_sem);  in tpm_try_get_ops()
177 	put_device(&chip->dev);  in tpm_try_get_ops()
183  * tpm_put_ops() - Release a ref to the tpm_chip
192 	mutex_unlock(&chip->tpm_mutex);  in tpm_put_ops()
193 	up_read(&chip->ops_sem);  in tpm_put_ops()
194 	put_device(&chip->dev);  in tpm_put_ops()
199  * tpm_default_chip() - find a TPM chip and get a reference to it
213 			get_device(&chip->dev);  in tpm_default_chip()
226  * tpm_find_get_ops() - find and reserve a TPM chip
255 	put_device(&chip->dev);  in tpm_find_get_ops()
262  * tpm_dev_release() - free chip memory and the device number
272 	idr_remove(&dev_nums_idr, chip->dev_num);  in tpm_dev_release()
275 	kfree(chip->work_space.context_buf);  in tpm_dev_release()
276 	kfree(chip->work_space.session_buf);  in tpm_dev_release()
277 	kfree(chip->allocated_banks);  in tpm_dev_release()
282  * tpm_class_shutdown() - prepare the TPM device for loss of power.
286  * TPM 2.0 spec. Then, calls bus- and device- specific shutdown code.
294 	down_write(&chip->ops_sem);  in tpm_class_shutdown()
295 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in tpm_class_shutdown()
301 	chip->ops = NULL;  in tpm_class_shutdown()
302 	up_write(&chip->ops_sem);  in tpm_class_shutdown()
308  * tpm_chip_alloc() - allocate a new struct tpm_chip instance
315  * device number for it. Must be paired with put_device(&chip->dev).
325 		return ERR_PTR(-ENOMEM);  in tpm_chip_alloc()
327 	mutex_init(&chip->tpm_mutex);  in tpm_chip_alloc()
328 	init_rwsem(&chip->ops_sem);  in tpm_chip_alloc()
330 	chip->ops = ops;  in tpm_chip_alloc()
340 	chip->dev_num = rc;  in tpm_chip_alloc()
342 	device_initialize(&chip->dev);  in tpm_chip_alloc()
344 	chip->dev.class = &tpm_class;  in tpm_chip_alloc()
345 	chip->dev.release = tpm_dev_release;  in tpm_chip_alloc()
346 	chip->dev.parent = pdev;  in tpm_chip_alloc()
347 	chip->dev.groups = chip->groups;  in tpm_chip_alloc()
349 	if (chip->dev_num == 0)  in tpm_chip_alloc()
350 		chip->dev.devt = MKDEV(MISC_MAJOR, TPM_MINOR);  in tpm_chip_alloc()
352 		chip->dev.devt = MKDEV(MAJOR(tpm_devt), chip->dev_num);  in tpm_chip_alloc()
354 	rc = dev_set_name(&chip->dev, "tpm%d", chip->dev_num);  in tpm_chip_alloc()
359 		chip->flags |= TPM_CHIP_FLAG_VIRTUAL;  in tpm_chip_alloc()
361 	cdev_init(&chip->cdev, &tpm_fops);  in tpm_chip_alloc()
362 	chip->cdev.owner = THIS_MODULE;  in tpm_chip_alloc()
364 	rc = tpm2_init_space(&chip->work_space, TPM2_SPACE_BUFFER_SIZE);  in tpm_chip_alloc()
366 		rc = -ENOMEM;  in tpm_chip_alloc()
370 	chip->locality = -1;  in tpm_chip_alloc()
374 	put_device(&chip->dev);  in tpm_chip_alloc()
385  * tpmm_chip_alloc() - allocate a new struct tpm_chip instance
403 				      &chip->dev);  in tpmm_chip_alloc()
417 	rc = cdev_device_add(&chip->cdev, &chip->dev);  in tpm_add_char_device()
419 		dev_err(&chip->dev,  in tpm_add_char_device()
421 			dev_name(&chip->dev), MAJOR(chip->dev.devt),  in tpm_add_char_device()
422 			MINOR(chip->dev.devt), rc);  in tpm_add_char_device()
426 	if (chip->flags & TPM_CHIP_FLAG_TPM2 && !tpm_is_firmware_upgrade(chip)) {  in tpm_add_char_device()
434 	idr_replace(&dev_nums_idr, chip, chip->dev_num);  in tpm_add_char_device()
440 	cdev_device_del(&chip->cdev, &chip->dev);  in tpm_add_char_device()
446 	cdev_device_del(&chip->cdev, &chip->dev);  in tpm_del_char_device()
450 	idr_replace(&dev_nums_idr, NULL, chip->dev_num);  in tpm_del_char_device()
454 	down_write(&chip->ops_sem);  in tpm_del_char_device()
457 	 * Check if chip->ops is still valid: In case that the controller  in tpm_del_char_device()
459 	 * shutdown handler we are called twice and chip->ops to NULL.  in tpm_del_char_device()
461 	if (chip->ops) {  in tpm_del_char_device()
462 		if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in tpm_del_char_device()
468 		chip->ops = NULL;  in tpm_del_char_device()
470 	up_write(&chip->ops_sem);  in tpm_del_char_device()
477 	if (chip->flags & (TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_VIRTUAL) ||  in tpm_del_legacy_sysfs()
481 	sysfs_remove_link(&chip->dev.parent->kobj, "ppi");  in tpm_del_legacy_sysfs()
483 	for (i = chip->groups[0]->attrs; *i != NULL; ++i)  in tpm_del_legacy_sysfs()
484 		sysfs_remove_link(&chip->dev.parent->kobj, (*i)->name);  in tpm_del_legacy_sysfs()
496 	if (chip->flags & (TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_VIRTUAL) ||  in tpm_add_legacy_sysfs()
501 		    &chip->dev.parent->kobj, &chip->dev.kobj, "ppi", NULL);  in tpm_add_legacy_sysfs()
502 	if (rc && rc != -ENOENT)  in tpm_add_legacy_sysfs()
505 	/* All the names from tpm-sysfs */  in tpm_add_legacy_sysfs()
506 	for (i = chip->groups[0]->attrs; *i != NULL; ++i) {  in tpm_add_legacy_sysfs()
508 		    &chip->dev.parent->kobj, &chip->dev.kobj, (*i)->name, NULL);  in tpm_add_legacy_sysfs()
523 	if (chip->flags & TPM_CHIP_FLAG_SUSPENDED)  in tpm_hwrng_read()
535 	if (chip->flags & TPM_CHIP_FLAG_HWRNG_DISABLED)  in tpm_is_hwrng_enabled()
545 	snprintf(chip->hwrng_name, sizeof(chip->hwrng_name),  in tpm_add_hwrng()
546 		 "tpm-rng-%d", chip->dev_num);  in tpm_add_hwrng()
547 	chip->hwrng.name = chip->hwrng_name;  in tpm_add_hwrng()
548 	chip->hwrng.read = tpm_hwrng_read;  in tpm_add_hwrng()
549 	return hwrng_register(&chip->hwrng);  in tpm_add_hwrng()
559 	rc = (chip->flags & TPM_CHIP_FLAG_TPM2) ?  in tpm_get_pcr_allocation()
564 		return -ENODEV;  in tpm_get_pcr_allocation()
570  * tpm_chip_bootstrap() - Boostrap TPM chip after power on
573  * Initialize TPM chip after power on. This a one-shot function: subsequent
580 	if (chip->flags & TPM_CHIP_FLAG_BOOTSTRAPPED)  in tpm_chip_bootstrap()
599 	chip->flags |= TPM_CHIP_FLAG_BOOTSTRAPPED;  in tpm_chip_bootstrap()
606  * tpm_chip_register() - create a character device for the TPM chip
611  * chips available for in-kernel use.
648 		hwrng_unregister(&chip->hwrng);  in tpm_chip_register()
657  * tpm_chip_unregister() - release the TPM driver
673 		hwrng_unregister(&chip->hwrng);  in tpm_chip_unregister()
675 	if (chip->flags & TPM_CHIP_FLAG_TPM2 && !tpm_is_firmware_upgrade(chip))  in tpm_chip_unregister()