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

/*
 * Copyright (C) 2012-2014 Intel Corporation
 *
 * Authors:
 * Xiaoyan Zhang <xiaoyan.zhang@intel.com>
 * Jiang Liu <jiang.liu@linux.intel.com>
 * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
 *
 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
 *
 * 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 u8 tpm_ppi_uuid[] = {
	0xA6, 0xFA, 0xDD, 0x3D,
	0x1B, 0x36,
	0xB4, 0x4E,
	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_uuid,
				       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_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;
}

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_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;
}

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_uuid,
			    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_uuid,
				      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 <xiaoyan.zhang@intel.com>
	6	* Jiang Liu <jiang.liu@linux.intel.com>
	7	* Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
	8	*
	9	* Maintained by: <tpmdd-devel@lists.sourceforge.net>
	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
84b1667d JL	35	static const u8 tpm_ppi_uuid[] = {
	36	0xA6, 0xFA, 0xDD, 0x3D,
	37	0x1B, 0x36,
	38	0xB4, 0x4E,
	39	0xA4, 0x24,
	40	0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53
	41	};
	42
84b1667d	43	static inline union acpi_object *
0dc55365 JS	44	tpm_eval_dsm(acpi_handle ppi_handle, int func, acpi_object_type type,
0dc55365 JS	45	union acpi_object *argv4)
f84fdff0	46	{
0dc55365 JS	47	BUG_ON(!ppi_handle);
	48	return acpi_evaluate_dsm_typed(ppi_handle, tpm_ppi_uuid,
	49	TPM_PPI_REVISION_ID,
	50	func, argv4, type);
f84fdff0 XZ	51	}
f84fdff0 XZ	52
81198078 XZ	53	static ssize_t tpm_show_ppi_version(struct device *dev,
81198078 XZ	54	struct device_attribute attr, char buf)
f84fdff0	55	{
9b774d5c	56	struct tpm_chip *chip = to_tpm_chip(dev);
0dc55365 JS	57
0dc55365 JS	58	return scnprintf(buf, PAGE_SIZE, "%s\n", chip->ppi_version);
f84fdff0 XZ	59	}
f84fdff0 XZ	60
81198078 XZ	61	static ssize_t tpm_show_ppi_request(struct device *dev,
81198078 XZ	62	struct device_attribute attr, char buf)
f84fdff0	63	{
84b1667d JL	64	ssize_t size = -EINVAL;
84b1667d JL	65	union acpi_object *obj;
9b774d5c	66	struct tpm_chip *chip = to_tpm_chip(dev);
84b1667d	67
0dc55365 JS	68	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETREQ,
0dc55365 JS	69	ACPI_TYPE_PACKAGE, NULL);
84b1667d	70	if (!obj)
f84fdff0 XZ	71	return -ENXIO;
f84fdff0 XZ	72
f84fdff0 XZ	73	/*
	74	* output.pointer should be of package type, including two integers.
	75	* The first is function return code, 0 means success and 1 means
	76	* error. The second is pending TPM operation requested by the OS, 0
	77	* means none and >0 means operation value.
	78	*/
84b1667d JL	79	if (obj->package.count == 2 &&
	80	obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
	81	obj->package.elements[1].type == ACPI_TYPE_INTEGER) {
	82	if (obj->package.elements[0].integer.value)
	83	size = -EFAULT;
f84fdff0	84	else
84b1667d JL	85	size = scnprintf(buf, PAGE_SIZE, "%llu\n",
84b1667d JL	86	obj->package.elements[1].integer.value);
f84fdff0	87	}
84b1667d JL	88
	89	ACPI_FREE(obj);
	90
	91	return size;
f84fdff0 XZ	92	}
f84fdff0 XZ	93
81198078 XZ	94	static ssize_t tpm_store_ppi_request(struct device *dev,
	95	struct device_attribute *attr,
	96	const char *buf, size_t count)
f84fdff0	97	{
f84fdff0 XZ	98	u32 req;
f84fdff0 XZ	99	u64 ret;
84b1667d JL	100	int func = TPM_PPI_FN_SUBREQ;
	101	union acpi_object *obj, tmp;
	102	union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
9b774d5c	103	struct tpm_chip *chip = to_tpm_chip(dev);
f84fdff0	104
f84fdff0 XZ	105	/*
	106	* the function to submit TPM operation request to pre-os environment
	107	* is updated with function index from SUBREQ to SUBREQ2 since PPI
	108	* version 1.1
	109	*/
0dc55365 JS	110	if (acpi_check_dsm(chip->acpi_dev_handle, tpm_ppi_uuid,
0dc55365 JS	111	TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_SUBREQ2))
84b1667d JL	112	func = TPM_PPI_FN_SUBREQ2;
84b1667d JL	113
f84fdff0 XZ	114	/*
	115	* PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS
	116	* accept buffer/string/integer type, but some BIOS accept buffer/
	117	* string/package type. For PPI version 1.0 and 1.1, use buffer type
	118	* for compatibility, and use package type since 1.2 according to spec.
	119	*/
0dc55365	120	if (strcmp(chip->ppi_version, "1.2") < 0) {
84b1667d JL	121	if (sscanf(buf, "%d", &req) != 1)
	122	return -EINVAL;
	123	argv4.type = ACPI_TYPE_BUFFER;
	124	argv4.buffer.length = sizeof(req);
	125	argv4.buffer.pointer = (u8 *)&req;
f84fdff0	126	} else {
84b1667d JL	127	tmp.type = ACPI_TYPE_INTEGER;
	128	if (sscanf(buf, "%llu", &tmp.integer.value) != 1)
	129	return -EINVAL;
	130	}
	131
0dc55365 JS	132	obj = tpm_eval_dsm(chip->acpi_dev_handle, func, ACPI_TYPE_INTEGER,
0dc55365 JS	133	&argv4);
84b1667d JL	134	if (!obj) {
84b1667d JL	135	return -ENXIO;
f84fdff0	136	} else {
84b1667d JL	137	ret = obj->integer.value;
84b1667d JL	138	ACPI_FREE(obj);
f84fdff0 XZ	139	}
f84fdff0 XZ	140
f84fdff0	141	if (ret == 0)
84b1667d JL	142	return (acpi_status)count;
	143
	144	return (ret == 1) ? -EPERM : -EFAULT;
f84fdff0 XZ	145	}
f84fdff0 XZ	146
81198078 XZ	147	static ssize_t tpm_show_ppi_transition_action(struct device *dev,
	148	struct device_attribute *attr,
	149	char *buf)
f84fdff0	150	{
f84fdff0	151	u32 ret;
84b1667d JL	152	acpi_status status;
	153	union acpi_object *obj = NULL;
	154	union acpi_object tmp = {
	155	.buffer.type = ACPI_TYPE_BUFFER,
	156	.buffer.length = 0,
	157	.buffer.pointer = NULL
	158	};
9b774d5c	159	struct tpm_chip *chip = to_tpm_chip(dev);
84b1667d JL	160
84b1667d JL	161	static char *info[] = {
f84fdff0 XZ	162	"None",
	163	"Shutdown",
	164	"Reboot",
	165	"OS Vendor-specific",
	166	"Error",
	167	};
f84fdff0	168
f84fdff0 XZ	169	/*
	170	* PPI spec defines params[3].type as empty package, but some platforms
	171	* (e.g. Capella with PPI 1.0) need integer/string/buffer type, so for
	172	* compatibility, define params[3].type as buffer, if PPI version < 1.2
	173	*/
0dc55365	174	if (strcmp(chip->ppi_version, "1.2") < 0)
84b1667d	175	obj = &tmp;
0dc55365 JS	176	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETACT,
0dc55365 JS	177	ACPI_TYPE_INTEGER, obj);
84b1667d JL	178	if (!obj) {
	179	return -ENXIO;
	180	} else {
	181	ret = obj->integer.value;
	182	ACPI_FREE(obj);
f84fdff0	183	}
84b1667d	184
f84fdff0 XZ	185	if (ret < ARRAY_SIZE(info) - 1)
	186	status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
	187	else
	188	status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
	189	info[ARRAY_SIZE(info)-1]);
f84fdff0 XZ	190	return status;
	191	}
	192
81198078 XZ	193	static ssize_t tpm_show_ppi_response(struct device *dev,
	194	struct device_attribute *attr,
	195	char *buf)
f84fdff0	196	{
84b1667d JL	197	acpi_status status = -EINVAL;
	198	union acpi_object obj, ret_obj;
	199	u64 req, res;
9b774d5c	200	struct tpm_chip *chip = to_tpm_chip(dev);
84b1667d	201
0dc55365 JS	202	obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETRSP,
0dc55365 JS	203	ACPI_TYPE_PACKAGE, NULL);
84b1667d	204	if (!obj)
f84fdff0 XZ	205	return -ENXIO;
f84fdff0 XZ	206
f84fdff0 XZ	207	/*
	208	* parameter output.pointer should be of package type, including
	209	* 3 integers. The first means function return code, the second means
	210	* most recent TPM operation request, and the last means response to
	211	* the most recent TPM operation request. Only if the first is 0, and
	212	* the second integer is not 0, the response makes sense.
	213	*/
84b1667d JL	214	ret_obj = obj->package.elements;
	215	if (obj->package.count < 3 \|\|
	216	ret_obj[0].type != ACPI_TYPE_INTEGER \|\|
	217	ret_obj[1].type != ACPI_TYPE_INTEGER \|\|
	218	ret_obj[2].type != ACPI_TYPE_INTEGER)
f84fdff0	219	goto cleanup;
84b1667d JL	220
84b1667d JL	221	if (ret_obj[0].integer.value) {
f84fdff0 XZ	222	status = -EFAULT;
	223	goto cleanup;
	224	}
84b1667d JL	225
	226	req = ret_obj[1].integer.value;
	227	res = ret_obj[2].integer.value;
	228	if (req) {
	229	if (res == 0)
f84fdff0 XZ	230	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	231	"0: Success");
84b1667d	232	else if (res == 0xFFFFFFF0)
f84fdff0 XZ	233	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	234	"0xFFFFFFF0: User Abort");
84b1667d	235	else if (res == 0xFFFFFFF1)
f84fdff0 XZ	236	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	237	"0xFFFFFFF1: BIOS Failure");
84b1667d	238	else if (res >= 1 && res <= 0x00000FFF)
f84fdff0	239	status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
84b1667d	240	req, res, "Corresponding TPM error");
f84fdff0 XZ	241	else
f84fdff0 XZ	242	status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
84b1667d	243	req, res, "Error");
f84fdff0 XZ	244	} else {
f84fdff0 XZ	245	status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
84b1667d	246	req, "No Recent Request");
f84fdff0	247	}
84b1667d	248
f84fdff0	249	cleanup:
84b1667d	250	ACPI_FREE(obj);
f84fdff0 XZ	251	return status;
	252	}
	253
0dc55365 JS	254	static ssize_t show_ppi_operations(acpi_handle dev_handle, char *buf, u32 start,
0dc55365 JS	255	u32 end)
f84fdff0	256	{
f84fdff0 XZ	257	int i;
f84fdff0 XZ	258	u32 ret;
84b1667d JL	259	char *str = buf;
	260	union acpi_object *obj, tmp;
	261	union acpi_object argv = ACPI_INIT_DSM_ARGV4(1, &tmp);
	262
	263	static char *info[] = {
f84fdff0 XZ	264	"Not implemented",
	265	"BIOS only",
	266	"Blocked for OS by BIOS",
	267	"User required",
	268	"User not required",
	269	};
f84fdff0	270
0dc55365	271	if (!acpi_check_dsm(dev_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
1569a4c4	272	1 << TPM_PPI_FN_GETOPR))
f84fdff0 XZ	273	return -EPERM;
f84fdff0 XZ	274
84b1667d	275	tmp.integer.type = ACPI_TYPE_INTEGER;
f84fdff0	276	for (i = start; i <= end; i++) {
84b1667d	277	tmp.integer.value = i;
0dc55365 JS	278	obj = tpm_eval_dsm(dev_handle, TPM_PPI_FN_GETOPR,
0dc55365 JS	279	ACPI_TYPE_INTEGER, &argv);
84b1667d	280	if (!obj) {
f84fdff0	281	return -ENOMEM;
84b1667d JL	282	} else {
	283	ret = obj->integer.value;
	284	ACPI_FREE(obj);
	285	}
f84fdff0	286
f84fdff0 XZ	287	if (ret > 0 && ret < ARRAY_SIZE(info))
	288	str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
	289	i, ret, info[ret]);
f84fdff0	290	}
84b1667d	291
f84fdff0 XZ	292	return str - buf;
	293	}
	294
81198078 XZ	295	static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
	296	struct device_attribute *attr,
	297	char *buf)
f84fdff0	298	{
9b774d5c	299	struct tpm_chip *chip = to_tpm_chip(dev);
0dc55365 JS	300
	301	return show_ppi_operations(chip->acpi_dev_handle, buf, 0,
	302	PPI_TPM_REQ_MAX);
f84fdff0 XZ	303	}
f84fdff0 XZ	304
81198078 XZ	305	static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
	306	struct device_attribute *attr,
	307	char *buf)
f84fdff0	308	{
9b774d5c	309	struct tpm_chip *chip = to_tpm_chip(dev);
0dc55365 JS	310
	311	return show_ppi_operations(chip->acpi_dev_handle, buf, PPI_VS_REQ_START,
	312	PPI_VS_REQ_END);
f84fdff0 XZ	313	}
	314
	315	static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
	316	static DEVICE_ATTR(request, S_IRUGO \| S_IWUSR \| S_IWGRP,
	317	tpm_show_ppi_request, tpm_store_ppi_request);
	318	static DEVICE_ATTR(transition_action, S_IRUGO,
	319	tpm_show_ppi_transition_action, NULL);
	320	static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL);
	321	static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL);
	322	static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL);
	323
	324	static struct attribute *ppi_attrs[] = {
	325	&dev_attr_version.attr,
	326	&dev_attr_request.attr,
	327	&dev_attr_transition_action.attr,
	328	&dev_attr_response.attr,
	329	&dev_attr_tcg_operations.attr,
	330	&dev_attr_vs_operations.attr, NULL,
	331	};
	332	static struct attribute_group ppi_attr_grp = {
1631cfb7	333	.name = "ppi",
f84fdff0 XZ	334	.attrs = ppi_attrs
	335	};
	336
9b774d5c	337	void tpm_add_ppi(struct tpm_chip *chip)
f84fdff0	338	{
0dc55365	339	union acpi_object *obj;
0dc55365 JS	340
0dc55365 JS	341	if (!chip->acpi_dev_handle)
9b774d5c	342	return;
0dc55365 JS	343
	344	if (!acpi_check_dsm(chip->acpi_dev_handle, tpm_ppi_uuid,
	345	TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_VERSION))
9b774d5c	346	return;
0dc55365 JS	347
	348	/* Cache PPI version string. */
	349	obj = acpi_evaluate_dsm_typed(chip->acpi_dev_handle, tpm_ppi_uuid,
	350	TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
	351	NULL, ACPI_TYPE_STRING);
	352	if (obj) {
	353	strlcpy(chip->ppi_version, obj->string.pointer,
	354	sizeof(chip->ppi_version));
	355	ACPI_FREE(obj);
	356	}
	357
9b774d5c	358	chip->groups[chip->groups_cnt++] = &ppi_attr_grp;
f84fdff0	359	}