[linux.git] / drivers / char / tpm / tpm_ppi.c

/*
 * Copyright (C) 2012-2014 Intel Corporation
 *
 * Authors:
 * Xiaoyan Zhang <[email protected]>
 * Jiang Liu <[email protected]>
 * Jarkko Sakkinen <[email protected]>
 *
 * Maintained by: <[email protected]>
 *
 * This file contains implementation of the sysfs interface for PPI.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2
 * of the License.
 */


#include <linux/acpi.h>
#include "tpm.h"

#define TPM_PPI_REVISION_ID	1
#define TPM_PPI_FN_VERSION	1
#define TPM_PPI_FN_SUBREQ	2
#define TPM_PPI_FN_GETREQ	3
#define TPM_PPI_FN_GETACT	4
#define TPM_PPI_FN_GETRSP	5
#define TPM_PPI_FN_SUBREQ2	7
#define TPM_PPI_FN_GETOPR	8
#define PPI_TPM_REQ_MAX		22
#define PPI_VS_REQ_START	128
#define PPI_VS_REQ_END		255

static const guid_t tpm_ppi_guid =
	GUID_INIT(0x3DDDFAA6, 0x361B, 0x4EB4,
		  0xA4, 0x24, 0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53);

static inline union acpi_object *
tpm_eval_dsm(acpi_handle ppi_handle, int func, acpi_object_type type,
	     union acpi_object *argv4)
{
	BUG_ON(!ppi_handle);
	return acpi_evaluate_dsm_typed(ppi_handle, &tpm_ppi_guid,
				       TPM_PPI_REVISION_ID,
				       func, argv4, type);
}

static ssize_t tpm_show_ppi_version(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	struct tpm_chip *chip = to_tpm_chip(dev);

	return scnprintf(buf, PAGE_SIZE, "%s\n", chip->ppi_version);
}

static ssize_t tpm_show_ppi_request(struct device *dev,
				    struct device_attribute *attr, char *buf)
{
	ssize_t size = -EINVAL;
	union acpi_object *obj;
	struct tpm_chip *chip = to_tpm_chip(dev);

	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETREQ,
			   ACPI_TYPE_PACKAGE, NULL);
	if (!obj)
		return -ENXIO;

	/*
	 * output.pointer should be of package type, including two integers.
	 * The first is function return code, 0 means success and 1 means
	 * error. The second is pending TPM operation requested by the OS, 0
	 * means none and >0 means operation value.
	 */
	if (obj->package.count == 2 &&
	    obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
	    obj->package.elements[1].type == ACPI_TYPE_INTEGER) {
		if (obj->package.elements[0].integer.value)
			size = -EFAULT;
		else
			size = scnprintf(buf, PAGE_SIZE, "%llu\n",
				 obj->package.elements[1].integer.value);
	}

	ACPI_FREE(obj);

	return size;
}

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_guid,
			   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;
}

static ssize_t tpm_show_ppi_transition_action(struct device *dev,
					      struct device_attribute *attr,
					      char *buf)
{
	u32 ret;
	acpi_status status;
	union acpi_object *obj = NULL;
	union acpi_object tmp = {
		.buffer.type = ACPI_TYPE_BUFFER,
		.buffer.length = 0,
		.buffer.pointer = NULL
	};
	struct tpm_chip *chip = to_tpm_chip(dev);

	static char *info[] = {
		"None",
		"Shutdown",
		"Reboot",
		"OS Vendor-specific",
		"Error",
	};

	/*
	 * PPI spec defines params[3].type as empty package, but some platforms
	 * (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for
	 * compatibility, define params[3].type as buffer, if PPI version < 1.2
	 */
	if (strcmp(chip->ppi_version, "1.2") < 0)
		obj = &tmp;
	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETACT,
			   ACPI_TYPE_INTEGER, obj);
	if (!obj) {
		return -ENXIO;
	} else {
		ret = obj->integer.value;
		ACPI_FREE(obj);
	}

	if (ret < ARRAY_SIZE(info) - 1)
		status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
	else
		status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
				   info[ARRAY_SIZE(info)-1]);
	return status;
}

static ssize_t tpm_show_ppi_response(struct device *dev,
				     struct device_attribute *attr,
				     char *buf)
{
	acpi_status status = -EINVAL;
	union acpi_object *obj, *ret_obj;
	u64 req, res;
	struct tpm_chip *chip = to_tpm_chip(dev);

	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETRSP,
			   ACPI_TYPE_PACKAGE, NULL);
	if (!obj)
		return -ENXIO;

	/*
	 * parameter output.pointer should be of package type, including
	 * 3 integers. The first means function return code, the second means
	 * most recent TPM operation request, and the last means response to
	 * the most recent TPM operation request. Only if the first is 0, and
	 * the second integer is not 0, the response makes sense.
	 */
	ret_obj = obj->package.elements;
	if (obj->package.count < 3 ||
	    ret_obj[0].type != ACPI_TYPE_INTEGER ||
	    ret_obj[1].type != ACPI_TYPE_INTEGER ||
	    ret_obj[2].type != ACPI_TYPE_INTEGER)
		goto cleanup;

	if (ret_obj[0].integer.value) {
		status = -EFAULT;
		goto cleanup;
	}

	req = ret_obj[1].integer.value;
	res = ret_obj[2].integer.value;
	if (req) {
		if (res == 0)
			status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
					   "0: Success");
		else if (res == 0xFFFFFFF0)
			status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
					   "0xFFFFFFF0: User Abort");
		else if (res == 0xFFFFFFF1)
			status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
					   "0xFFFFFFF1: BIOS Failure");
		else if (res >= 1 && res <= 0x00000FFF)
			status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
					   req, res, "Corresponding TPM error");
		else
			status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
					   req, res, "Error");
	} else {
		status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
				   req, "No Recent Request");
	}

cleanup:
	ACPI_FREE(obj);
	return status;
}

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_guid, 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;
}

static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
					   struct device_attribute *attr,
					   char *buf)
{
	struct tpm_chip *chip = to_tpm_chip(dev);

	return show_ppi_operations(chip->acpi_dev_handle, buf, 0,
				   PPI_TPM_REQ_MAX);
}

static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
					  struct device_attribute *attr,
					  char *buf)
{
	struct tpm_chip *chip = to_tpm_chip(dev);

	return show_ppi_operations(chip->acpi_dev_handle, buf, PPI_VS_REQ_START,
				   PPI_VS_REQ_END);
}

static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
static DEVICE_ATTR(request, S_IRUGO | S_IWUSR | S_IWGRP,
		   tpm_show_ppi_request, tpm_store_ppi_request);
static DEVICE_ATTR(transition_action, S_IRUGO,
		   tpm_show_ppi_transition_action, NULL);
static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL);
static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL);
static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL);

static struct attribute *ppi_attrs[] = {
	&dev_attr_version.attr,
	&dev_attr_request.attr,
	&dev_attr_transition_action.attr,
	&dev_attr_response.attr,
	&dev_attr_tcg_operations.attr,
	&dev_attr_vs_operations.attr, NULL,
};
static struct attribute_group ppi_attr_grp = {
	.name = "ppi",
	.attrs = ppi_attrs
};

void tpm_add_ppi(struct tpm_chip *chip)
{
	union acpi_object *obj;

	if (!chip->acpi_dev_handle)
		return;

	if (!acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
			    TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_VERSION))
		return;

	/* Cache PPI version string. */
	obj = acpi_evaluate_dsm_typed(chip->acpi_dev_handle, &tpm_ppi_guid,
				      TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
				      NULL, ACPI_TYPE_STRING);
	if (obj) {
		strlcpy(chip->ppi_version, obj->string.pointer,
			sizeof(chip->ppi_version));
		ACPI_FREE(obj);
	}

	chip->groups[chip->groups_cnt++] = &ppi_attr_grp;
}
Commit	Line	Data
0dc55365 JS	1	/*
	2	* Copyright (C) 2012-2014 Intel Corporation
	3	*
	4	* Authors:
	5	* Xiaoyan Zhang <[email protected]>
	6	* Jiang Liu <[email protected]>
	7	* Jarkko Sakkinen <[email protected]>
	8	*
	9	* Maintained by: <[email protected]>
	10	*
	11	* This file contains implementation of the sysfs interface for PPI.
	12	*
	13	* This program is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU General Public License
	15	* as published by the Free Software Foundation; version 2
	16	* of the License.
	17	*/
	18
	19
f84fdff0	20	#include <linux/acpi.h>
f84fdff0 XZ	21	#include "tpm.h"
f84fdff0 XZ	22
f84fdff0 XZ	23	#define TPM_PPI_REVISION_ID 1
	24	#define TPM_PPI_FN_VERSION 1
	25	#define TPM_PPI_FN_SUBREQ 2
	26	#define TPM_PPI_FN_GETREQ 3
	27	#define TPM_PPI_FN_GETACT 4
	28	#define TPM_PPI_FN_GETRSP 5
	29	#define TPM_PPI_FN_SUBREQ2 7
	30	#define TPM_PPI_FN_GETOPR 8
	31	#define PPI_TPM_REQ_MAX 22
	32	#define PPI_VS_REQ_START 128
	33	#define PPI_VS_REQ_END 255
f84fdff0	34
94116f81 AS	35	static const guid_t tpm_ppi_guid =
	36	GUID_INIT(0x3DDDFAA6, 0x361B, 0x4EB4,
	37	0xA4, 0x24, 0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53);
84b1667d	38
84b1667d	39	static inline union acpi_object *
0dc55365 JS	40	tpm_eval_dsm(acpi_handle ppi_handle, int func, acpi_object_type type,
0dc55365 JS	41	union acpi_object *argv4)
f84fdff0	42	{
0dc55365	43	BUG_ON(!ppi_handle);
94116f81	44	return acpi_evaluate_dsm_typed(ppi_handle, &tpm_ppi_guid,
0dc55365 JS	45	TPM_PPI_REVISION_ID,
0dc55365 JS	46	func, argv4, type);
f84fdff0 XZ	47	}
f84fdff0 XZ	48
81198078 XZ	49	static ssize_t tpm_show_ppi_version(struct device *dev,
81198078 XZ	50	struct device_attribute attr, char buf)
f84fdff0	51	{
9b774d5c	52	struct tpm_chip *chip = to_tpm_chip(dev);
0dc55365 JS	53
0dc55365 JS	54	return scnprintf(buf, PAGE_SIZE, "%s\n", chip->ppi_version);
f84fdff0 XZ	55	}
f84fdff0 XZ	56
81198078 XZ	57	static ssize_t tpm_show_ppi_request(struct device *dev,
81198078 XZ	58	struct device_attribute attr, char buf)
f84fdff0	59	{
84b1667d JL	60	ssize_t size = -EINVAL;
84b1667d JL	61	union acpi_object *obj;
9b774d5c	62	struct tpm_chip *chip = to_tpm_chip(dev);
84b1667d	63
0dc55365 JS	64	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETREQ,
0dc55365 JS	65	ACPI_TYPE_PACKAGE, NULL);
84b1667d	66	if (!obj)
f84fdff0 XZ	67	return -ENXIO;
f84fdff0 XZ	68
f84fdff0 XZ	69	/*
	70	* output.pointer should be of package type, including two integers.
	71	* The first is function return code, 0 means success and 1 means
	72	* error. The second is pending TPM operation requested by the OS, 0
	73	* means none and >0 means operation value.
	74	*/
84b1667d JL	75	if (obj->package.count == 2 &&
	76	obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
	77	obj->package.elements[1].type == ACPI_TYPE_INTEGER) {
	78	if (obj->package.elements[0].integer.value)
	79	size = -EFAULT;
f84fdff0	80	else
84b1667d JL	81	size = scnprintf(buf, PAGE_SIZE, "%llu\n",
84b1667d JL	82	obj->package.elements[1].integer.value);
f84fdff0	83	}
84b1667d JL	84
	85	ACPI_FREE(obj);
	86
	87	return size;
f84fdff0 XZ	88	}
f84fdff0 XZ	89
81198078 XZ	90	static ssize_t tpm_store_ppi_request(struct device *dev,
	91	struct device_attribute *attr,
	92	const char *buf, size_t count)
f84fdff0	93	{
f84fdff0 XZ	94	u32 req;
f84fdff0 XZ	95	u64 ret;
84b1667d JL	96	int func = TPM_PPI_FN_SUBREQ;
	97	union acpi_object *obj, tmp;
	98	union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
9b774d5c	99	struct tpm_chip *chip = to_tpm_chip(dev);
f84fdff0	100
f84fdff0 XZ	101	/*
	102	* the function to submit TPM operation request to pre-os environment
	103	* is updated with function index from SUBREQ to SUBREQ2 since PPI
	104	* version 1.1
	105	*/
94116f81	106	if (acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
0dc55365	107	TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_SUBREQ2))
84b1667d JL	108	func = TPM_PPI_FN_SUBREQ2;
84b1667d JL	109
f84fdff0 XZ	110	/*
	111	* PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS
	112	* accept buffer/string/integer type, but some BIOS accept buffer/
	113	* string/package type. For PPI version 1.0 and 1.1, use buffer type
	114	* for compatibility, and use package type since 1.2 according to spec.
	115	*/
0dc55365	116	if (strcmp(chip->ppi_version, "1.2") < 0) {
84b1667d JL	117	if (sscanf(buf, "%d", &req) != 1)
	118	return -EINVAL;
	119	argv4.type = ACPI_TYPE_BUFFER;
	120	argv4.buffer.length = sizeof(req);
	121	argv4.buffer.pointer = (u8 *)&req;
f84fdff0	122	} else {
84b1667d JL	123	tmp.type = ACPI_TYPE_INTEGER;
	124	if (sscanf(buf, "%llu", &tmp.integer.value) != 1)
	125	return -EINVAL;
	126	}
	127
0dc55365 JS	128	obj = tpm_eval_dsm(chip->acpi_dev_handle, func, ACPI_TYPE_INTEGER,
0dc55365 JS	129	&argv4);
84b1667d JL	130	if (!obj) {
84b1667d JL	131	return -ENXIO;
f84fdff0	132	} else {
84b1667d JL	133	ret = obj->integer.value;
84b1667d JL	134	ACPI_FREE(obj);
f84fdff0 XZ	135	}
f84fdff0 XZ	136
f84fdff0	137	if (ret == 0)
84b1667d JL	138	return (acpi_status)count;
	139
	140	return (ret == 1) ? -EPERM : -EFAULT;
f84fdff0 XZ	141	}
f84fdff0 XZ	142
81198078 XZ	143	static ssize_t tpm_show_ppi_transition_action(struct device *dev,
	144	struct device_attribute *attr,
	145	char *buf)
f84fdff0	146	{
f84fdff0	147	u32 ret;
84b1667d JL	148	acpi_status status;
	149	union acpi_object *obj = NULL;
	150	union acpi_object tmp = {
	151	.buffer.type = ACPI_TYPE_BUFFER,
	152	.buffer.length = 0,
	153	.buffer.pointer = NULL
	154	};
9b774d5c	155	struct tpm_chip *chip = to_tpm_chip(dev);
84b1667d JL	156
84b1667d JL	157	static char *info[] = {
f84fdff0 XZ	158	"None",
	159	"Shutdown",
	160	"Reboot",
	161	"OS Vendor-specific",
	162	"Error",
	163	};
f84fdff0	164
f84fdff0 XZ	165	/*
	166	* PPI spec defines params[3].type as empty package, but some platforms
	167	* (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for
	168	* compatibility, define params[3].type as buffer, if PPI version < 1.2
	169	*/
0dc55365	170	if (strcmp(chip->ppi_version, "1.2") < 0)
84b1667d	171	obj = &tmp;
0dc55365 JS	172	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETACT,
0dc55365 JS	173	ACPI_TYPE_INTEGER, obj);
84b1667d JL	174	if (!obj) {
	175	return -ENXIO;
	176	} else {
	177	ret = obj->integer.value;
	178	ACPI_FREE(obj);
f84fdff0	179	}
84b1667d	180
f84fdff0 XZ	181	if (ret < ARRAY_SIZE(info) - 1)
	182	status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
	183	else
	184	status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
	185	info[ARRAY_SIZE(info)-1]);
f84fdff0 XZ	186	return status;
	187	}
	188
81198078 XZ	189	static ssize_t tpm_show_ppi_response(struct device *dev,
	190	struct device_attribute *attr,
	191	char *buf)
f84fdff0	192	{
84b1667d JL	193	acpi_status status = -EINVAL;
	194	union acpi_object obj, ret_obj;
	195	u64 req, res;
9b774d5c	196	struct tpm_chip *chip = to_tpm_chip(dev);
84b1667d	197
0dc55365 JS	198	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETRSP,
0dc55365 JS	199	ACPI_TYPE_PACKAGE, NULL);
84b1667d	200	if (!obj)
f84fdff0 XZ	201	return -ENXIO;
f84fdff0 XZ	202
f84fdff0 XZ	203	/*
	204	* parameter output.pointer should be of package type, including
	205	* 3 integers. The first means function return code, the second means
	206	* most recent TPM operation request, and the last means response to
	207	* the most recent TPM operation request. Only if the first is 0, and
	208	* the second integer is not 0, the response makes sense.
	209	*/
84b1667d JL	210	ret_obj = obj->package.elements;
	211	if (obj->package.count < 3 \|\|
	212	ret_obj[0].type != ACPI_TYPE_INTEGER \|\|
	213	ret_obj[1].type != ACPI_TYPE_INTEGER \|\|
	214	ret_obj[2].type != ACPI_TYPE_INTEGER)
f84fdff0	215	goto cleanup;
84b1667d JL	216
84b1667d JL	217	if (ret_obj[0].integer.value) {
f84fdff0 XZ	218	status = -EFAULT;
	219	goto cleanup;
	220	}
84b1667d JL	221
	222	req = ret_obj[1].integer.value;
	223	res = ret_obj[2].integer.value;
	224	if (req) {
	225	if (res == 0)
f84fdff0 XZ	226	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	227	"0: Success");
84b1667d	228	else if (res == 0xFFFFFFF0)
f84fdff0 XZ	229	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	230	"0xFFFFFFF0: User Abort");
84b1667d	231	else if (res == 0xFFFFFFF1)
f84fdff0 XZ	232	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	233	"0xFFFFFFF1: BIOS Failure");
84b1667d	234	else if (res >= 1 && res <= 0x00000FFF)
f84fdff0	235	status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
84b1667d	236	req, res, "Corresponding TPM error");
f84fdff0 XZ	237	else
f84fdff0 XZ	238	status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
84b1667d	239	req, res, "Error");
f84fdff0 XZ	240	} else {
f84fdff0 XZ	241	status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
84b1667d	242	req, "No Recent Request");
f84fdff0	243	}
84b1667d	244
f84fdff0	245	cleanup:
84b1667d	246	ACPI_FREE(obj);
f84fdff0 XZ	247	return status;
	248	}
	249
0dc55365 JS	250	static ssize_t show_ppi_operations(acpi_handle dev_handle, char *buf, u32 start,
0dc55365 JS	251	u32 end)
f84fdff0	252	{
f84fdff0 XZ	253	int i;
f84fdff0 XZ	254	u32 ret;
84b1667d JL	255	char *str = buf;
	256	union acpi_object *obj, tmp;
	257	union acpi_object argv = ACPI_INIT_DSM_ARGV4(1, &tmp);
	258
	259	static char *info[] = {
f84fdff0 XZ	260	"Not implemented",
	261	"BIOS only",
	262	"Blocked for OS by BIOS",
	263	"User required",
	264	"User not required",
	265	};
f84fdff0	266
94116f81	267	if (!acpi_check_dsm(dev_handle, &tpm_ppi_guid, TPM_PPI_REVISION_ID,
1569a4c4	268	1 << TPM_PPI_FN_GETOPR))
f84fdff0 XZ	269	return -EPERM;
f84fdff0 XZ	270
84b1667d	271	tmp.integer.type = ACPI_TYPE_INTEGER;
f84fdff0	272	for (i = start; i <= end; i++) {
84b1667d	273	tmp.integer.value = i;
0dc55365 JS	274	obj = tpm_eval_dsm(dev_handle, TPM_PPI_FN_GETOPR,
0dc55365 JS	275	ACPI_TYPE_INTEGER, &argv);
84b1667d	276	if (!obj) {
f84fdff0	277	return -ENOMEM;
84b1667d JL	278	} else {
	279	ret = obj->integer.value;
	280	ACPI_FREE(obj);
	281	}
f84fdff0	282
f84fdff0 XZ	283	if (ret > 0 && ret < ARRAY_SIZE(info))
	284	str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
	285	i, ret, info[ret]);
f84fdff0	286	}
84b1667d	287
f84fdff0 XZ	288	return str - buf;
	289	}
	290
81198078 XZ	291	static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
	292	struct device_attribute *attr,
	293	char *buf)
f84fdff0	294	{
9b774d5c	295	struct tpm_chip *chip = to_tpm_chip(dev);
0dc55365 JS	296
	297	return show_ppi_operations(chip->acpi_dev_handle, buf, 0,
	298	PPI_TPM_REQ_MAX);
f84fdff0 XZ	299	}
f84fdff0 XZ	300
81198078 XZ	301	static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
	302	struct device_attribute *attr,
	303	char *buf)
f84fdff0	304	{
9b774d5c	305	struct tpm_chip *chip = to_tpm_chip(dev);
0dc55365 JS	306
	307	return show_ppi_operations(chip->acpi_dev_handle, buf, PPI_VS_REQ_START,
	308	PPI_VS_REQ_END);
f84fdff0 XZ	309	}
	310
	311	static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
	312	static DEVICE_ATTR(request, S_IRUGO \| S_IWUSR \| S_IWGRP,
	313	tpm_show_ppi_request, tpm_store_ppi_request);
	314	static DEVICE_ATTR(transition_action, S_IRUGO,
	315	tpm_show_ppi_transition_action, NULL);
	316	static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL);
	317	static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL);
	318	static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL);
	319
	320	static struct attribute *ppi_attrs[] = {
	321	&dev_attr_version.attr,
	322	&dev_attr_request.attr,
	323	&dev_attr_transition_action.attr,
	324	&dev_attr_response.attr,
	325	&dev_attr_tcg_operations.attr,
	326	&dev_attr_vs_operations.attr, NULL,
	327	};
	328	static struct attribute_group ppi_attr_grp = {
1631cfb7	329	.name = "ppi",
f84fdff0 XZ	330	.attrs = ppi_attrs
	331	};
	332
9b774d5c	333	void tpm_add_ppi(struct tpm_chip *chip)
f84fdff0	334	{
0dc55365	335	union acpi_object *obj;
0dc55365 JS	336
0dc55365 JS	337	if (!chip->acpi_dev_handle)
9b774d5c	338	return;
0dc55365	339
94116f81	340	if (!acpi_check_dsm(chip->acpi_dev_handle, &tpm_ppi_guid,
0dc55365	341	TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_VERSION))
9b774d5c	342	return;
0dc55365 JS	343
0dc55365 JS	344	/* Cache PPI version string. */
94116f81	345	obj = acpi_evaluate_dsm_typed(chip->acpi_dev_handle, &tpm_ppi_guid,
0dc55365 JS	346	TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
	347	NULL, ACPI_TYPE_STRING);
	348	if (obj) {
	349	strlcpy(chip->ppi_version, obj->string.pointer,
	350	sizeof(chip->ppi_version));
	351	ACPI_FREE(obj);
	352	}
	353
9b774d5c	354	chip->groups[chip->groups_cnt++] = &ppi_attr_grp;
f84fdff0	355	}