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->log.bios_event_log);  in tpm_dev_release()
271 	kfree(chip->work_space.context_buf);  in tpm_dev_release()
272 	kfree(chip->work_space.session_buf);  in tpm_dev_release()
273 	kfree(chip->allocated_banks);  in tpm_dev_release()
278  * tpm_class_shutdown() - prepare the TPM device for loss of power.
282  * TPM 2.0 spec. Then, calls bus- and device- specific shutdown code.
290 	down_write(&chip->ops_sem);  in tpm_class_shutdown()
291 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in tpm_class_shutdown()
297 	chip->ops = NULL;  in tpm_class_shutdown()
298 	up_write(&chip->ops_sem);  in tpm_class_shutdown()
304  * tpm_chip_alloc() - allocate a new struct tpm_chip instance
311  * device number for it. Must be paired with put_device(&chip->dev).
321 		return ERR_PTR(-ENOMEM);  in tpm_chip_alloc()
323 	mutex_init(&chip->tpm_mutex);  in tpm_chip_alloc()
324 	init_rwsem(&chip->ops_sem);  in tpm_chip_alloc()
326 	chip->ops = ops;  in tpm_chip_alloc()
336 	chip->dev_num = rc;  in tpm_chip_alloc()
338 	device_initialize(&chip->dev);  in tpm_chip_alloc()
340 	chip->dev.class = tpm_class;  in tpm_chip_alloc()
341 	chip->dev.class->shutdown_pre = tpm_class_shutdown;  in tpm_chip_alloc()
342 	chip->dev.release = tpm_dev_release;  in tpm_chip_alloc()
343 	chip->dev.parent = pdev;  in tpm_chip_alloc()
344 	chip->dev.groups = chip->groups;  in tpm_chip_alloc()
346 	if (chip->dev_num == 0)  in tpm_chip_alloc()
347 		chip->dev.devt = MKDEV(MISC_MAJOR, TPM_MINOR);  in tpm_chip_alloc()
349 		chip->dev.devt = MKDEV(MAJOR(tpm_devt), chip->dev_num);  in tpm_chip_alloc()
351 	rc = dev_set_name(&chip->dev, "tpm%d", chip->dev_num);  in tpm_chip_alloc()
356 		chip->flags |= TPM_CHIP_FLAG_VIRTUAL;  in tpm_chip_alloc()
358 	cdev_init(&chip->cdev, &tpm_fops);  in tpm_chip_alloc()
359 	chip->cdev.owner = THIS_MODULE;  in tpm_chip_alloc()
361 	rc = tpm2_init_space(&chip->work_space, TPM2_SPACE_BUFFER_SIZE);  in tpm_chip_alloc()
363 		rc = -ENOMEM;  in tpm_chip_alloc()
367 	chip->locality = -1;  in tpm_chip_alloc()
371 	put_device(&chip->dev);  in tpm_chip_alloc()
377  * tpmm_chip_alloc() - allocate a new struct tpm_chip instance
395 				      &chip->dev);  in tpmm_chip_alloc()
409 	rc = cdev_device_add(&chip->cdev, &chip->dev);  in tpm_add_char_device()
411 		dev_err(&chip->dev,  in tpm_add_char_device()
413 			dev_name(&chip->dev), MAJOR(chip->dev.devt),  in tpm_add_char_device()
414 			MINOR(chip->dev.devt), rc);  in tpm_add_char_device()
418 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in tpm_add_char_device()
426 	idr_replace(&dev_nums_idr, chip, chip->dev_num);  in tpm_add_char_device()
432 	cdev_device_del(&chip->cdev, &chip->dev);  in tpm_add_char_device()
438 	cdev_device_del(&chip->cdev, &chip->dev);  in tpm_del_char_device()
442 	idr_replace(&dev_nums_idr, NULL, chip->dev_num);  in tpm_del_char_device()
446 	down_write(&chip->ops_sem);  in tpm_del_char_device()
447 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in tpm_del_char_device()
453 	chip->ops = NULL;  in tpm_del_char_device()
454 	up_write(&chip->ops_sem);  in tpm_del_char_device()
461 	if (chip->flags & (TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_VIRTUAL))  in tpm_del_legacy_sysfs()
464 	sysfs_remove_link(&chip->dev.parent->kobj, "ppi");  in tpm_del_legacy_sysfs()
466 	for (i = chip->groups[0]->attrs; *i != NULL; ++i)  in tpm_del_legacy_sysfs()
467 		sysfs_remove_link(&chip->dev.parent->kobj, (*i)->name);  in tpm_del_legacy_sysfs()
479 	if (chip->flags & (TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_VIRTUAL))  in tpm_add_legacy_sysfs()
483 		    &chip->dev.parent->kobj, &chip->dev.kobj, "ppi", NULL);  in tpm_add_legacy_sysfs()
484 	if (rc && rc != -ENOENT)  in tpm_add_legacy_sysfs()
487 	/* All the names from tpm-sysfs */  in tpm_add_legacy_sysfs()
488 	for (i = chip->groups[0]->attrs; *i != NULL; ++i) {  in tpm_add_legacy_sysfs()
490 		    &chip->dev.parent->kobj, &chip->dev.kobj, (*i)->name, NULL);  in tpm_add_legacy_sysfs()
512 	snprintf(chip->hwrng_name, sizeof(chip->hwrng_name),  in tpm_add_hwrng()
513 		 "tpm-rng-%d", chip->dev_num);  in tpm_add_hwrng()
514 	chip->hwrng.name = chip->hwrng_name;  in tpm_add_hwrng()
515 	chip->hwrng.read = tpm_hwrng_read;  in tpm_add_hwrng()
516 	return hwrng_register(&chip->hwrng);  in tpm_add_hwrng()
523 	rc = (chip->flags & TPM_CHIP_FLAG_TPM2) ?  in tpm_get_pcr_allocation()
528 		return -ENODEV;  in tpm_get_pcr_allocation()
534  * tpm_chip_register() - create a character device for the TPM chip
539  * chips available for in-kernel use.
586 		hwrng_unregister(&chip->hwrng);  in tpm_chip_register()
595  * tpm_chip_unregister() - release the TPM driver
611 		hwrng_unregister(&chip->hwrng);  in tpm_chip_unregister()
613 	if (chip->flags & TPM_CHIP_FLAG_TPM2)  in tpm_chip_unregister()