1 // SPDX-License-Identifier: GPL-2.0-only
12  * Maintained by: <tpmdd-devel@lists.sourceforge.net>
22 #include <linux/poll.h>
33  * Bug workaround - some TPM's don't flush the most
35  * with an extend to the selected _unused_ non-volatile pcr.
43  * tpm_calc_ordinal_duration() - calculate the maximum command duration
54 	if (chip->flags & TPM_CHIP_FLAG_TPM2)  in tpm_calc_ordinal_duration()
66 	u32 count, ordinal;  in tpm_try_transmit()  local
70 		return -EINVAL;  in tpm_try_transmit()
75 	count = be32_to_cpu(header->length);  in tpm_try_transmit()
76 	ordinal = be32_to_cpu(header->ordinal);  in tpm_try_transmit()
77 	if (count == 0)  in tpm_try_transmit()
78 		return -ENODATA;  in tpm_try_transmit()
79 	if (count > bufsiz) {  in tpm_try_transmit()
80 		dev_err(&chip->dev,  in tpm_try_transmit()
81 			"invalid count value %x %zx\n", count, bufsiz);  in tpm_try_transmit()
82 		return -E2BIG;  in tpm_try_transmit()
85 	rc = chip->ops->send(chip, buf, count);  in tpm_try_transmit()
87 		if (rc != -EPIPE)  in tpm_try_transmit()
88 			dev_err(&chip->dev,  in tpm_try_transmit()
97 		dev_warn(&chip->dev,  in tpm_try_transmit()
102 	if (chip->flags & TPM_CHIP_FLAG_IRQ)  in tpm_try_transmit()
107 		u8 status = chip->ops->status(chip);  in tpm_try_transmit()
108 		if ((status & chip->ops->req_complete_mask) ==  in tpm_try_transmit()
109 		    chip->ops->req_complete_val)  in tpm_try_transmit()
112 		if (chip->ops->req_canceled(chip, status)) {  in tpm_try_transmit()
113 			dev_err(&chip->dev, "Operation Canceled\n");  in tpm_try_transmit()
114 			return -ECANCELED;  in tpm_try_transmit()
121 	chip->ops->cancel(chip);  in tpm_try_transmit()
122 	dev_err(&chip->dev, "Operation Timed out\n");  in tpm_try_transmit()
123 	return -ETIME;  in tpm_try_transmit()
126 	len = chip->ops->recv(chip, buf, bufsiz);  in tpm_try_transmit()
129 		dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %d\n", rc);  in tpm_try_transmit()
130 	} else if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length))  in tpm_try_transmit()
131 		rc = -EFAULT;  in tpm_try_transmit()
137  * tpm_transmit - Internal kernel interface to transmit TPM commands.
146  * Note that TPM 1.x never returns TPM2_RC_RETRY so the retry logic is TPM 2.0
150  * * The response length	- OK
151  * * -errno			- A system error
163 	u32 cc = be32_to_cpu(header->return_code);  in tpm_transmit()
176 		rc = be32_to_cpu(header->return_code);  in tpm_transmit()
188 				dev_err(&chip->dev, "in retry loop\n");  in tpm_transmit()
190 				dev_err(&chip->dev,  in tpm_transmit()
202  * tpm_transmit_cmd - send a tpm command to the device
209  * * 0		- OK
210  * * -errno	- A system error
211  * * TPM_RC	- A TPM error
216 	const struct tpm_header *header = (struct tpm_header *)buf->data;  in tpm_transmit_cmd()
220 	len = tpm_transmit(chip, buf->data, PAGE_SIZE);  in tpm_transmit_cmd()
224 	err = be32_to_cpu(header->return_code);  in tpm_transmit_cmd()
227 		dev_err(&chip->dev, "A TPM error (%d) occurred %s\n", err,  in tpm_transmit_cmd()
233 		return -EFAULT;  in tpm_transmit_cmd()
235 	buf->length = len;  in tpm_transmit_cmd()
242 	if (chip->flags & TPM_CHIP_FLAG_HAVE_TIMEOUTS)  in tpm_get_timeouts()
245 	if (chip->flags & TPM_CHIP_FLAG_TPM2)  in tpm_get_timeouts()
253  * tpm_is_tpm2 - do we a have a TPM2 chip?
267 		return -ENODEV;  in tpm_is_tpm2()
269 	rc = (chip->flags & TPM_CHIP_FLAG_TPM2) != 0;  in tpm_is_tpm2()
278  * tpm_pcr_read - read a PCR value from SHA1 bank
292 		return -ENODEV;  in tpm_pcr_read()
294 	if (chip->flags & TPM_CHIP_FLAG_TPM2)  in tpm_pcr_read()
297 		rc = tpm1_pcr_read(chip, pcr_idx, digest->digest);  in tpm_pcr_read()
305  * tpm_pcr_extend - extend a PCR value in SHA1 bank.
311  * order of the banks in chip->allocated_banks.
323 		return -ENODEV;  in tpm_pcr_extend()
325 	for (i = 0; i < chip->nr_allocated_banks; i++) {  in tpm_pcr_extend()
326 		if (digests[i].alg_id != chip->allocated_banks[i].alg_id) {  in tpm_pcr_extend()
327 			rc = -EINVAL;  in tpm_pcr_extend()
332 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in tpm_pcr_extend()
350 	if (!(chip->ops->flags & TPM_OPS_AUTO_STARTUP))  in tpm_auto_startup()
353 	if (chip->flags & TPM_CHIP_FLAG_TPM2)  in tpm_auto_startup()
371 		return -ENODEV;  in tpm_pm_suspend()
376 		chip->flags |= TPM_CHIP_FLAG_SUSPENDED;  in tpm_pm_suspend()
380 	if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)  in tpm_pm_suspend()
383 	if ((chip->flags & TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED) &&  in tpm_pm_suspend()
387 	if (chip->flags & TPM_CHIP_FLAG_TPM2) {  in tpm_pm_suspend()
396 	chip->flags |= TPM_CHIP_FLAG_SUSPENDED;  in tpm_pm_suspend()
415 		return -ENODEV;  in tpm_pm_resume()
417 	chip->flags &= ~TPM_CHIP_FLAG_SUSPENDED;  in tpm_pm_resume()
430  * tpm_get_random() - get random bytes from the TPM's RNG
442 		return -EINVAL;  in tpm_get_random()
446 		return -ENODEV;  in tpm_get_random()
449 	if (chip->flags & TPM_CHIP_FLAG_SUSPENDED) {  in tpm_get_random()
454 	if (chip->flags & TPM_CHIP_FLAG_TPM2)  in tpm_get_random()