drivers/char/tpm/tpm_tis_core.c

Source file repositories/reference/linux-study-clean/drivers/char/tpm/tpm_tis_core.c

File Facts

System
Linux kernel
Corpus path
drivers/char/tpm/tpm_tis_core.c
Extension
.c
Size
34346 bytes
Lines
1384
Domain
Driver Families
Bucket
drivers/char
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct tis_vendor_durations_override {
	u32 did_vid;
	struct tpm1_version version;
	unsigned long durations[3];
};

static const struct  tis_vendor_durations_override vendor_dur_overrides[] = {
	/* STMicroelectronics 0x104a */
	{ 0x0000104a,
	  { 1, 2, 8, 28 },
	  { (2 * 60 * HZ), (2 * 60 * HZ), (2 * 60 * HZ) } },
};

static void tpm_tis_update_durations(struct tpm_chip *chip,
				     unsigned long *duration_cap)
{
	struct tpm_tis_data *priv = dev_get_drvdata(&chip->dev);
	struct tpm1_version *version;
	u32 did_vid;
	int i, rc;
	cap_t cap;

	chip->duration_adjusted = false;

	if (chip->ops->clk_enable != NULL)
		chip->ops->clk_enable(chip, true);

	rc = tpm_tis_read32(priv, TPM_DID_VID(0), &did_vid);
	if (rc < 0) {
		dev_warn(&chip->dev, "%s: failed to read did_vid. %d\n",
			 __func__, rc);
		goto out;
	}

	/* Try to get a TPM version 1.2 or 1.1 TPM_CAP_VERSION_INFO */
	rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_2, &cap,
			 "attempting to determine the 1.2 version",
			 sizeof(cap.version2));
	if (!rc) {
		version = &cap.version2.version;
	} else {
		rc = tpm1_getcap(chip, TPM_CAP_VERSION_1_1, &cap,
				 "attempting to determine the 1.1 version",
				 sizeof(cap.version1));

		if (rc)
			goto out;

		version = &cap.version1;
	}

	for (i = 0; i != ARRAY_SIZE(vendor_dur_overrides); i++) {
		if (vendor_dur_overrides[i].did_vid != did_vid)
			continue;

		if ((version->major ==
		     vendor_dur_overrides[i].version.major) &&
		    (version->minor ==
		     vendor_dur_overrides[i].version.minor) &&
		    (version->rev_major ==
		     vendor_dur_overrides[i].version.rev_major) &&
		    (version->rev_minor ==
		     vendor_dur_overrides[i].version.rev_minor)) {

			memcpy(duration_cap,
			       vendor_dur_overrides[i].durations,
			       sizeof(vendor_dur_overrides[i].durations));

			chip->duration_adjusted = true;
			goto out;
		}
	}

out:
	if (chip->ops->clk_enable != NULL)
		chip->ops->clk_enable(chip, false);
}

struct tis_vendor_timeout_override {
	u32 did_vid;
	unsigned long timeout_us[4];
};

static const struct tis_vendor_timeout_override vendor_timeout_overrides[] = {
	/* Atmel 3204 */
	{ 0x32041114, { (TIS_SHORT_TIMEOUT*1000), (TIS_LONG_TIMEOUT*1000),
			(TIS_SHORT_TIMEOUT*1000), (TIS_SHORT_TIMEOUT*1000) } },
};

static void tpm_tis_update_timeouts(struct tpm_chip *chip,

Annotation

Implementation Notes