^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Copyright (C) 2004 IBM Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2014 Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Authors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Leendert van Doorn <leendert@watson.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Dave Safford <safford@watson.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Reiner Sailer <sailer@watson.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Kylene Hall <kjhall@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Maintained by: <tpmdd-devel@lists.sourceforge.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Device driver for TCG/TCPA TPM (trusted platform module).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Specifications at www.trustedcomputinggroup.org
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Note, the TPM chip is not interrupt driven (only polling)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * and can have very long timeouts (minutes!). Hence the unusual
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * calls to msleep.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/suspend.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/freezer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/tpm_eventlog.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include "tpm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * Bug workaround - some TPM's don't flush the most
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * recently changed pcr on suspend, so force the flush
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) * with an extend to the selected _unused_ non-volatile pcr.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) static u32 tpm_suspend_pcr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) MODULE_PARM_DESC(suspend_pcr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) "PCR to use for dummy writes to facilitate flush on suspend.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) * tpm_calc_ordinal_duration() - calculate the maximum command duration
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) * @chip: TPM chip to use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) * @ordinal: TPM command ordinal.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * The function returns the maximum amount of time the chip could take
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) * to return the result for a particular ordinal in jiffies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) * Return: A maximal duration time for an ordinal in jiffies.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) if (chip->flags & TPM_CHIP_FLAG_TPM2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) return tpm2_calc_ordinal_duration(chip, ordinal);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return tpm1_calc_ordinal_duration(chip, ordinal);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) static ssize_t tpm_try_transmit(struct tpm_chip *chip, void *buf, size_t bufsiz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct tpm_header *header = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) ssize_t len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) u32 count, ordinal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) unsigned long stop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (bufsiz < TPM_HEADER_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) if (bufsiz > TPM_BUFSIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) bufsiz = TPM_BUFSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) count = be32_to_cpu(header->length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) ordinal = be32_to_cpu(header->ordinal);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (count == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return -ENODATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (count > bufsiz) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) dev_err(&chip->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) "invalid count value %x %zx\n", count, bufsiz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return -E2BIG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) rc = chip->ops->send(chip, buf, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) if (rc < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) if (rc != -EPIPE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) dev_err(&chip->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) "%s: send(): error %d\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* A sanity check. send() should just return zero on success e.g.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) * not the command length.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (rc > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) dev_warn(&chip->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) "%s: send(): invalid value %d\n", __func__, rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (chip->flags & TPM_CHIP_FLAG_IRQ)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) goto out_recv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) u8 status = chip->ops->status(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if ((status & chip->ops->req_complete_mask) ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) chip->ops->req_complete_val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) goto out_recv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (chip->ops->req_canceled(chip, status)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) dev_err(&chip->dev, "Operation Canceled\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return -ECANCELED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) tpm_msleep(TPM_TIMEOUT_POLL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) rmb();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) } while (time_before(jiffies, stop));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) chip->ops->cancel(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) dev_err(&chip->dev, "Operation Timed out\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return -ETIME;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) out_recv:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) len = chip->ops->recv(chip, buf, bufsiz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) if (len < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) rc = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) dev_err(&chip->dev, "tpm_transmit: tpm_recv: error %d\n", rc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) } else if (len < TPM_HEADER_SIZE || len != be32_to_cpu(header->length))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) rc = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) return rc ? rc : len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * tpm_transmit - Internal kernel interface to transmit TPM commands.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * @chip: a TPM chip to use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) * @buf: a TPM command buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) * @bufsiz: length of the TPM command buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) * A wrapper around tpm_try_transmit() that handles TPM2_RC_RETRY returns from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) * the TPM and retransmits the command after a delay up to a maximum wait of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) * TPM2_DURATION_LONG.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) * Note that TPM 1.x never returns TPM2_RC_RETRY so the retry logic is TPM 2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) * only.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) * Return:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * * The response length - OK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) * * -errno - A system error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) struct tpm_header *header = (struct tpm_header *)buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) /* space for header and handles */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) u8 save[TPM_HEADER_SIZE + 3*sizeof(u32)];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) unsigned int delay_msec = TPM2_DURATION_SHORT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) u32 rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) const size_t save_size = min(sizeof(save), bufsiz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) /* the command code is where the return code will be */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) u32 cc = be32_to_cpu(header->return_code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) * Subtlety here: if we have a space, the handles will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) * transformed, so when we restore the header we also have to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) * restore the handles.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) memcpy(save, buf, save_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) for (;;) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) ret = tpm_try_transmit(chip, buf, bufsiz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) rc = be32_to_cpu(header->return_code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) if (rc != TPM2_RC_RETRY && rc != TPM2_RC_TESTING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * return immediately if self test returns test
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * still running to shorten boot time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) if (rc == TPM2_RC_TESTING && cc == TPM2_CC_SELF_TEST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) if (delay_msec > TPM2_DURATION_LONG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (rc == TPM2_RC_RETRY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) dev_err(&chip->dev, "in retry loop\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) dev_err(&chip->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) "self test is still running\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) tpm_msleep(delay_msec);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) delay_msec *= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) memcpy(buf, save, save_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) * tpm_transmit_cmd - send a tpm command to the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) * @chip: a TPM chip to use
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) * @buf: a TPM command buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) * @min_rsp_body_length: minimum expected length of response body
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) * @desc: command description used in the error message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) * Return:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) * * 0 - OK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) * * -errno - A system error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) * * TPM_RC - A TPM error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) size_t min_rsp_body_length, const char *desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) const struct tpm_header *header = (struct tpm_header *)buf->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) ssize_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) len = tpm_transmit(chip, buf->data, PAGE_SIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) if (len < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) err = be32_to_cpu(header->return_code);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) if (err != 0 && err != TPM_ERR_DISABLED && err != TPM_ERR_DEACTIVATED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) && err != TPM2_RC_TESTING && desc)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) dev_err(&chip->dev, "A TPM error (%d) occurred %s\n", err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (len < min_rsp_body_length + TPM_HEADER_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) EXPORT_SYMBOL_GPL(tpm_transmit_cmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) int tpm_get_timeouts(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) if (chip->flags & TPM_CHIP_FLAG_HAVE_TIMEOUTS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (chip->flags & TPM_CHIP_FLAG_TPM2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) return tpm2_get_timeouts(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) return tpm1_get_timeouts(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) EXPORT_SYMBOL_GPL(tpm_get_timeouts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) * tpm_is_tpm2 - do we a have a TPM2 chip?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) * @chip: a &struct tpm_chip instance, %NULL for the default chip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) * Return:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) * 1 if we have a TPM2 chip.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) * 0 if we don't have a TPM2 chip.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) * A negative number for system errors (errno).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) int tpm_is_tpm2(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) chip = tpm_find_get_ops(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (!chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) rc = (chip->flags & TPM_CHIP_FLAG_TPM2) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) tpm_put_ops(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) EXPORT_SYMBOL_GPL(tpm_is_tpm2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) * tpm_pcr_read - read a PCR value from SHA1 bank
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) * @chip: a &struct tpm_chip instance, %NULL for the default chip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) * @pcr_idx: the PCR to be retrieved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) * @digest: the PCR bank and buffer current PCR value is written to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) * Return: same as with tpm_transmit_cmd()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) struct tpm_digest *digest)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) chip = tpm_find_get_ops(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) if (!chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) if (chip->flags & TPM_CHIP_FLAG_TPM2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) rc = tpm2_pcr_read(chip, pcr_idx, digest, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) rc = tpm1_pcr_read(chip, pcr_idx, digest->digest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) tpm_put_ops(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) EXPORT_SYMBOL_GPL(tpm_pcr_read);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) * tpm_pcr_extend - extend a PCR value in SHA1 bank.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) * @chip: a &struct tpm_chip instance, %NULL for the default chip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) * @pcr_idx: the PCR to be retrieved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) * @digests: array of tpm_digest structures used to extend PCRs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) * Note: callers must pass a digest for every allocated PCR bank, in the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) * order of the banks in chip->allocated_banks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) * Return: same as with tpm_transmit_cmd()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) struct tpm_digest *digests)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) chip = tpm_find_get_ops(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) if (!chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) for (i = 0; i < chip->nr_allocated_banks; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) if (digests[i].alg_id != chip->allocated_banks[i].alg_id) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) rc = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) if (chip->flags & TPM_CHIP_FLAG_TPM2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) rc = tpm2_pcr_extend(chip, pcr_idx, digests);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) rc = tpm1_pcr_extend(chip, pcr_idx, digests[0].digest,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) "attempting extend a PCR value");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) tpm_put_ops(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) EXPORT_SYMBOL_GPL(tpm_pcr_extend);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) * tpm_send - send a TPM command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) * @chip: a &struct tpm_chip instance, %NULL for the default chip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) * @cmd: a TPM command buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) * @buflen: the length of the TPM command buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) * Return: same as with tpm_transmit_cmd()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) struct tpm_buf buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) chip = tpm_find_get_ops(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) if (!chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) buf.data = cmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to a send a command");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) tpm_put_ops(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) EXPORT_SYMBOL_GPL(tpm_send);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) int tpm_auto_startup(struct tpm_chip *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (!(chip->ops->flags & TPM_OPS_AUTO_STARTUP))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (chip->flags & TPM_CHIP_FLAG_TPM2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) rc = tpm2_auto_startup(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) rc = tpm1_auto_startup(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) * We are about to suspend. Save the TPM state
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * so that it can be restored.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) int tpm_pm_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) struct tpm_chip *chip = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) int rc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) if (!chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (chip->flags & TPM_CHIP_FLAG_ALWAYS_POWERED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) goto suspended;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) if ((chip->flags & TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) !pm_suspend_via_firmware())
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) goto suspended;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) if (!tpm_chip_start(chip)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) if (chip->flags & TPM_CHIP_FLAG_TPM2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) tpm2_shutdown(chip, TPM2_SU_STATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) rc = tpm1_pm_suspend(chip, tpm_suspend_pcr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) tpm_chip_stop(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) suspended:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) EXPORT_SYMBOL_GPL(tpm_pm_suspend);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * Resume from a power safe. The BIOS already restored
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * the TPM state.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) int tpm_pm_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) struct tpm_chip *chip = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) if (chip == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) EXPORT_SYMBOL_GPL(tpm_pm_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) * tpm_get_random() - get random bytes from the TPM's RNG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) * @chip: a &struct tpm_chip instance, %NULL for the default chip
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) * @out: destination buffer for the random bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) * @max: the max number of bytes to write to @out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * Return: number of random bytes read or a negative error value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) int tpm_get_random(struct tpm_chip *chip, u8 *out, size_t max)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) if (!out || max > TPM_MAX_RNG_DATA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) chip = tpm_find_get_ops(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) if (!chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) if (chip->flags & TPM_CHIP_FLAG_TPM2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) rc = tpm2_get_random(chip, out, max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) rc = tpm1_get_random(chip, out, max);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) tpm_put_ops(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) EXPORT_SYMBOL_GPL(tpm_get_random);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) static int __init tpm_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) int rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) tpm_class = class_create(THIS_MODULE, "tpm");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) if (IS_ERR(tpm_class)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) pr_err("couldn't create tpm class\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) return PTR_ERR(tpm_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) tpmrm_class = class_create(THIS_MODULE, "tpmrm");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (IS_ERR(tpmrm_class)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) pr_err("couldn't create tpmrm class\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) rc = PTR_ERR(tpmrm_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) goto out_destroy_tpm_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) rc = alloc_chrdev_region(&tpm_devt, 0, 2*TPM_NUM_DEVICES, "tpm");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) if (rc < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) pr_err("tpm: failed to allocate char dev region\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) goto out_destroy_tpmrm_class;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) rc = tpm_dev_common_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (rc) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) pr_err("tpm: failed to allocate char dev region\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) goto out_unreg_chrdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) out_unreg_chrdev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) unregister_chrdev_region(tpm_devt, 2 * TPM_NUM_DEVICES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) out_destroy_tpmrm_class:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) class_destroy(tpmrm_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) out_destroy_tpm_class:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) class_destroy(tpm_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) return rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) static void __exit tpm_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) idr_destroy(&dev_nums_idr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) class_destroy(tpm_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) class_destroy(tpmrm_class);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) unregister_chrdev_region(tpm_devt, 2*TPM_NUM_DEVICES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) tpm_dev_common_exit();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) subsys_initcall(tpm_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) module_exit(tpm_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) MODULE_DESCRIPTION("TPM Driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) MODULE_VERSION("2.0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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