Example #1
0
static ssize_t tpm_store_ppi_request(struct device *dev,
				     struct device_attribute *attr,
				     const char *buf, size_t count)
{
	u32 req;
	u64 ret;
	int func = TPM_PPI_FN_SUBREQ;
	union acpi_object *obj, tmp;
	union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
	struct tpm_chip *chip = to_tpm_chip(dev);

	/*
	 * the function to submit TPM operation request to pre-os environment
	 * is updated with function index from SUBREQ to SUBREQ2 since PPI
	 * version 1.1
	 */
	if (acpi_check_dsm(chip->acpi_dev_handle, tpm_ppi_uuid,
			   TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_SUBREQ2))
		func = TPM_PPI_FN_SUBREQ2;

	/*
	 * PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS
	 * accept buffer/string/integer type, but some BIOS accept buffer/
	 * string/package type. For PPI version 1.0 and 1.1, use buffer type
	 * for compatibility, and use package type since 1.2 according to spec.
	 */
	if (strcmp(chip->ppi_version, "1.2") < 0) {
		if (sscanf(buf, "%d", &req) != 1)
			return -EINVAL;
		argv4.type = ACPI_TYPE_BUFFER;
		argv4.buffer.length = sizeof(req);
		argv4.buffer.pointer = (u8 *)&req;
	} else {
		tmp.type = ACPI_TYPE_INTEGER;
		if (sscanf(buf, "%llu", &tmp.integer.value) != 1)
			return -EINVAL;
	}

	obj = tpm_eval_dsm(chip->acpi_dev_handle, func, ACPI_TYPE_INTEGER,
			   &argv4);
	if (!obj) {
		return -ENXIO;
	} else {
		ret = obj->integer.value;
		ACPI_FREE(obj);
	}

	if (ret == 0)
		return (acpi_status)count;

	return (ret == 1) ? -EPERM : -EFAULT;
}
Example #2
0
static ssize_t show_ppi_operations(acpi_handle dev_handle, char *buf, u32 start,
				   u32 end)
{
	int i;
	u32 ret;
	char *str = buf;
	union acpi_object *obj, tmp;
	union acpi_object argv = ACPI_INIT_DSM_ARGV4(1, &tmp);

	static char *info[] = {
		"Not implemented",
		"BIOS only",
		"Blocked for OS by BIOS",
		"User required",
		"User not required",
	};

	if (!acpi_check_dsm(dev_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
			    1 << TPM_PPI_FN_GETOPR))
		return -EPERM;

	tmp.integer.type = ACPI_TYPE_INTEGER;
	for (i = start; i <= end; i++) {
		tmp.integer.value = i;
		obj = tpm_eval_dsm(dev_handle, TPM_PPI_FN_GETOPR,
				   ACPI_TYPE_INTEGER, &argv);
		if (!obj) {
			return -ENOMEM;
		} else {
			ret = obj->integer.value;
			ACPI_FREE(obj);
		}

		if (ret > 0 && ret < ARRAY_SIZE(info))
			str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
					 i, ret, info[ret]);
	}

	return str - buf;
}
Example #3
0
static int dwc3_pci_dsm(struct dwc3_pci *dwc, int param)
{
	union acpi_object *obj;
	union acpi_object tmp;
	union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);

	if (!dwc->has_dsm_for_pm)
		return 0;

	tmp.type = ACPI_TYPE_INTEGER;
	tmp.integer.value = param;

	obj = acpi_evaluate_dsm(ACPI_HANDLE(&dwc->pci->dev), &dwc->guid,
			1, PCI_INTEL_BXT_FUNC_PMU_PWR, &argv4);
	if (!obj) {
		dev_err(&dwc->pci->dev, "failed to evaluate _DSM\n");
		return -EIO;
	}

	ACPI_FREE(obj);

	return 0;
}