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

#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
#define PPI_VERSION_LEN		3

static const u8 tpm_ppi_uuid[] = {
	0xA6, 0xFA, 0xDD, 0x3D,
	0x1B, 0x36,
	0xB4, 0x4E,
	0xA4, 0x24,
	0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53
};

static char tpm_ppi_version[PPI_VERSION_LEN + 1];
static acpi_handle tpm_ppi_handle;

static acpi_status ppi_callback(acpi_handle handle, u32 level, void *context,
				void **return_value)
{
	union acpi_object *obj;

	if (!acpi_check_dsm(handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
			    1 << TPM_PPI_FN_VERSION))
		return AE_OK;

	/* Cache version string */
	obj = acpi_evaluate_dsm_typed(handle, tpm_ppi_uuid,
				      TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
				      NULL, ACPI_TYPE_STRING);
	if (obj) {
		strlcpy(tpm_ppi_version, obj->string.pointer,
			PPI_VERSION_LEN + 1);
		ACPI_FREE(obj);
	}

	*return_value = handle;

	return AE_CTRL_TERMINATE;
}

static inline union acpi_object *
tpm_eval_dsm(int func, acpi_object_type type, union acpi_object *argv4)
{
	BUG_ON(!tpm_ppi_handle);
	return acpi_evaluate_dsm_typed(tpm_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)
{
	return scnprintf(buf, PAGE_SIZE, "%s\n", tpm_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;

	obj = tpm_eval_dsm(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);

	/*
	 * 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(tpm_ppi_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(tpm_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(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
	};

	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(tpm_ppi_version, "1.2") < 0)
		obj = &tmp;
	obj = tpm_eval_dsm(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;

	obj = tpm_eval_dsm(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(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(tpm_ppi_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(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)
{
	return show_ppi_operations(buf, 0, PPI_TPM_REQ_MAX);
}

static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
					  struct device_attribute *attr,
					  char *buf)
{
	return show_ppi_operations(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
};

int tpm_add_ppi(struct kobject *parent)
{
	/* Cache TPM ACPI handle and version string */
	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
			    ppi_callback, NULL, NULL, &tpm_ppi_handle);
	return tpm_ppi_handle ? sysfs_create_group(parent, &ppi_attr_grp) : 0;
}

void tpm_remove_ppi(struct kobject *parent)
{
	if (tpm_ppi_handle)
		sysfs_remove_group(parent, &ppi_attr_grp);
}
Commit	Line	Data
f84fdff0	1	#include <linux/acpi.h>
f84fdff0 XZ	2	#include "tpm.h"
f84fdff0 XZ	3
f84fdff0 XZ	4	#define TPM_PPI_REVISION_ID 1
	5	#define TPM_PPI_FN_VERSION 1
	6	#define TPM_PPI_FN_SUBREQ 2
	7	#define TPM_PPI_FN_GETREQ 3
	8	#define TPM_PPI_FN_GETACT 4
	9	#define TPM_PPI_FN_GETRSP 5
	10	#define TPM_PPI_FN_SUBREQ2 7
	11	#define TPM_PPI_FN_GETOPR 8
	12	#define PPI_TPM_REQ_MAX 22
	13	#define PPI_VS_REQ_START 128
	14	#define PPI_VS_REQ_END 255
	15	#define PPI_VERSION_LEN 3
	16
84b1667d JL	17	static const u8 tpm_ppi_uuid[] = {
	18	0xA6, 0xFA, 0xDD, 0x3D,
	19	0x1B, 0x36,
	20	0xB4, 0x4E,
	21	0xA4, 0x24,
	22	0x8D, 0x10, 0x08, 0x9D, 0x16, 0x53
	23	};
	24
84b1667d JL	25	static char tpm_ppi_version[PPI_VERSION_LEN + 1];
	26	static acpi_handle tpm_ppi_handle;
	27
f84fdff0 XZ	28	static acpi_status ppi_callback(acpi_handle handle, u32 level, void *context,
	29	void **return_value)
	30	{
1569a4c4	31	union acpi_object *obj;
df45c712	32
1569a4c4 JL	33	if (!acpi_check_dsm(handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
1569a4c4 JL	34	1 << TPM_PPI_FN_VERSION))
84b1667d JL	35	return AE_OK;
84b1667d JL	36
1569a4c4 JL	37	/* Cache version string */
	38	obj = acpi_evaluate_dsm_typed(handle, tpm_ppi_uuid,
	39	TPM_PPI_REVISION_ID, TPM_PPI_FN_VERSION,
	40	NULL, ACPI_TYPE_STRING);
	41	if (obj) {
	42	strlcpy(tpm_ppi_version, obj->string.pointer,
	43	PPI_VERSION_LEN + 1);
	44	ACPI_FREE(obj);
f84fdff0	45	}
df45c712	46
1569a4c4 JL	47	*return_value = handle;
	48
	49	return AE_CTRL_TERMINATE;
f84fdff0 XZ	50	}
f84fdff0 XZ	51
84b1667d JL	52	static inline union acpi_object *
84b1667d JL	53	tpm_eval_dsm(int func, acpi_object_type type, union acpi_object *argv4)
f84fdff0	54	{
84b1667d JL	55	BUG_ON(!tpm_ppi_handle);
	56	return acpi_evaluate_dsm_typed(tpm_ppi_handle, tpm_ppi_uuid,
	57	TPM_PPI_REVISION_ID, func, argv4, type);
f84fdff0 XZ	58	}
f84fdff0 XZ	59
81198078 XZ	60	static ssize_t tpm_show_ppi_version(struct device *dev,
81198078 XZ	61	struct device_attribute attr, char buf)
f84fdff0	62	{
84b1667d	63	return scnprintf(buf, PAGE_SIZE, "%s\n", tpm_ppi_version);
f84fdff0 XZ	64	}
f84fdff0 XZ	65
81198078 XZ	66	static ssize_t tpm_show_ppi_request(struct device *dev,
81198078 XZ	67	struct device_attribute attr, char buf)
f84fdff0	68	{
84b1667d JL	69	ssize_t size = -EINVAL;
	70	union acpi_object *obj;
	71
	72	obj = tpm_eval_dsm(TPM_PPI_FN_GETREQ, ACPI_TYPE_PACKAGE, NULL);
	73	if (!obj)
f84fdff0 XZ	74	return -ENXIO;
f84fdff0 XZ	75
f84fdff0 XZ	76	/*
	77	* output.pointer should be of package type, including two integers.
	78	* The first is function return code, 0 means success and 1 means
	79	* error. The second is pending TPM operation requested by the OS, 0
	80	* means none and >0 means operation value.
	81	*/
84b1667d JL	82	if (obj->package.count == 2 &&
	83	obj->package.elements[0].type == ACPI_TYPE_INTEGER &&
	84	obj->package.elements[1].type == ACPI_TYPE_INTEGER) {
	85	if (obj->package.elements[0].integer.value)
	86	size = -EFAULT;
f84fdff0	87	else
84b1667d JL	88	size = scnprintf(buf, PAGE_SIZE, "%llu\n",
84b1667d JL	89	obj->package.elements[1].integer.value);
f84fdff0	90	}
84b1667d JL	91
	92	ACPI_FREE(obj);
	93
	94	return size;
f84fdff0 XZ	95	}
f84fdff0 XZ	96
81198078 XZ	97	static ssize_t tpm_store_ppi_request(struct device *dev,
	98	struct device_attribute *attr,
	99	const char *buf, size_t count)
f84fdff0	100	{
f84fdff0 XZ	101	u32 req;
f84fdff0 XZ	102	u64 ret;
84b1667d JL	103	int func = TPM_PPI_FN_SUBREQ;
	104	union acpi_object *obj, tmp;
	105	union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
f84fdff0	106
f84fdff0 XZ	107	/*
	108	* the function to submit TPM operation request to pre-os environment
	109	* is updated with function index from SUBREQ to SUBREQ2 since PPI
	110	* version 1.1
	111	*/
1569a4c4 JL	112	if (acpi_check_dsm(tpm_ppi_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
1569a4c4 JL	113	1 << TPM_PPI_FN_SUBREQ2))
84b1667d JL	114	func = TPM_PPI_FN_SUBREQ2;
84b1667d JL	115
f84fdff0 XZ	116	/*
	117	* PPI spec defines params[3].type as ACPI_TYPE_PACKAGE. Some BIOS
	118	* accept buffer/string/integer type, but some BIOS accept buffer/
	119	* string/package type. For PPI version 1.0 and 1.1, use buffer type
	120	* for compatibility, and use package type since 1.2 according to spec.
	121	*/
84b1667d JL	122	if (strcmp(tpm_ppi_version, "1.2") < 0) {
	123	if (sscanf(buf, "%d", &req) != 1)
	124	return -EINVAL;
	125	argv4.type = ACPI_TYPE_BUFFER;
	126	argv4.buffer.length = sizeof(req);
	127	argv4.buffer.pointer = (u8 *)&req;
f84fdff0	128	} else {
84b1667d JL	129	tmp.type = ACPI_TYPE_INTEGER;
	130	if (sscanf(buf, "%llu", &tmp.integer.value) != 1)
	131	return -EINVAL;
	132	}
	133
	134	obj = tpm_eval_dsm(func, ACPI_TYPE_INTEGER, &argv4);
	135	if (!obj) {
	136	return -ENXIO;
f84fdff0	137	} else {
84b1667d JL	138	ret = obj->integer.value;
84b1667d JL	139	ACPI_FREE(obj);
f84fdff0 XZ	140	}
f84fdff0 XZ	141
f84fdff0	142	if (ret == 0)
84b1667d JL	143	return (acpi_status)count;
	144
	145	return (ret == 1) ? -EPERM : -EFAULT;
f84fdff0 XZ	146	}
f84fdff0 XZ	147
81198078 XZ	148	static ssize_t tpm_show_ppi_transition_action(struct device *dev,
	149	struct device_attribute *attr,
	150	char *buf)
f84fdff0	151	{
f84fdff0	152	u32 ret;
84b1667d JL	153	acpi_status status;
	154	union acpi_object *obj = NULL;
	155	union acpi_object tmp = {
	156	.buffer.type = ACPI_TYPE_BUFFER,
	157	.buffer.length = 0,
	158	.buffer.pointer = NULL
	159	};
	160
	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	*/
84b1667d JL	174	if (strcmp(tpm_ppi_version, "1.2") < 0)
	175	obj = &tmp;
	176	obj = tpm_eval_dsm(TPM_PPI_FN_GETACT, ACPI_TYPE_INTEGER, obj);
	177	if (!obj) {
	178	return -ENXIO;
	179	} else {
	180	ret = obj->integer.value;
	181	ACPI_FREE(obj);
f84fdff0	182	}
84b1667d	183
f84fdff0 XZ	184	if (ret < ARRAY_SIZE(info) - 1)
	185	status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret, info[ret]);
	186	else
	187	status = scnprintf(buf, PAGE_SIZE, "%d: %s\n", ret,
	188	info[ARRAY_SIZE(info)-1]);
f84fdff0 XZ	189	return status;
	190	}
	191
81198078 XZ	192	static ssize_t tpm_show_ppi_response(struct device *dev,
	193	struct device_attribute *attr,
	194	char *buf)
f84fdff0	195	{
84b1667d JL	196	acpi_status status = -EINVAL;
	197	union acpi_object obj, ret_obj;
	198	u64 req, res;
	199
	200	obj = tpm_eval_dsm(TPM_PPI_FN_GETRSP, ACPI_TYPE_PACKAGE, NULL);
	201	if (!obj)
f84fdff0 XZ	202	return -ENXIO;
f84fdff0 XZ	203
f84fdff0 XZ	204	/*
	205	* parameter output.pointer should be of package type, including
	206	* 3 integers. The first means function return code, the second means
	207	* most recent TPM operation request, and the last means response to
	208	* the most recent TPM operation request. Only if the first is 0, and
	209	* the second integer is not 0, the response makes sense.
	210	*/
84b1667d JL	211	ret_obj = obj->package.elements;
	212	if (obj->package.count < 3 \|\|
	213	ret_obj[0].type != ACPI_TYPE_INTEGER \|\|
	214	ret_obj[1].type != ACPI_TYPE_INTEGER \|\|
	215	ret_obj[2].type != ACPI_TYPE_INTEGER)
f84fdff0	216	goto cleanup;
84b1667d JL	217
84b1667d JL	218	if (ret_obj[0].integer.value) {
f84fdff0 XZ	219	status = -EFAULT;
	220	goto cleanup;
	221	}
84b1667d JL	222
	223	req = ret_obj[1].integer.value;
	224	res = ret_obj[2].integer.value;
	225	if (req) {
	226	if (res == 0)
f84fdff0 XZ	227	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	228	"0: Success");
84b1667d	229	else if (res == 0xFFFFFFF0)
f84fdff0 XZ	230	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	231	"0xFFFFFFF0: User Abort");
84b1667d	232	else if (res == 0xFFFFFFF1)
f84fdff0 XZ	233	status = scnprintf(buf, PAGE_SIZE, "%llu %s\n", req,
f84fdff0 XZ	234	"0xFFFFFFF1: BIOS Failure");
84b1667d	235	else if (res >= 1 && res <= 0x00000FFF)
f84fdff0	236	status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
84b1667d	237	req, res, "Corresponding TPM error");
f84fdff0 XZ	238	else
f84fdff0 XZ	239	status = scnprintf(buf, PAGE_SIZE, "%llu %llu: %s\n",
84b1667d	240	req, res, "Error");
f84fdff0 XZ	241	} else {
f84fdff0 XZ	242	status = scnprintf(buf, PAGE_SIZE, "%llu: %s\n",
84b1667d	243	req, "No Recent Request");
f84fdff0	244	}
84b1667d	245
f84fdff0	246	cleanup:
84b1667d	247	ACPI_FREE(obj);
f84fdff0 XZ	248	return status;
	249	}
	250
	251	static ssize_t show_ppi_operations(char *buf, u32 start, u32 end)
	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
1569a4c4 JL	267	if (!acpi_check_dsm(tpm_ppi_handle, tpm_ppi_uuid, TPM_PPI_REVISION_ID,
1569a4c4 JL	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 JL	273	tmp.integer.value = i;
	274	obj = tpm_eval_dsm(TPM_PPI_FN_GETOPR, ACPI_TYPE_INTEGER, &argv);
	275	if (!obj) {
f84fdff0	276	return -ENOMEM;
84b1667d JL	277	} else {
	278	ret = obj->integer.value;
	279	ACPI_FREE(obj);
	280	}
f84fdff0	281
f84fdff0 XZ	282	if (ret > 0 && ret < ARRAY_SIZE(info))
	283	str += scnprintf(str, PAGE_SIZE, "%d %d: %s\n",
	284	i, ret, info[ret]);
f84fdff0	285	}
84b1667d	286
f84fdff0 XZ	287	return str - buf;
	288	}
	289
81198078 XZ	290	static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
	291	struct device_attribute *attr,
	292	char *buf)
f84fdff0 XZ	293	{
	294	return show_ppi_operations(buf, 0, PPI_TPM_REQ_MAX);
	295	}
	296
81198078 XZ	297	static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
	298	struct device_attribute *attr,
	299	char *buf)
f84fdff0 XZ	300	{
	301	return show_ppi_operations(buf, PPI_VS_REQ_START, PPI_VS_REQ_END);
	302	}
	303
	304	static DEVICE_ATTR(version, S_IRUGO, tpm_show_ppi_version, NULL);
	305	static DEVICE_ATTR(request, S_IRUGO \| S_IWUSR \| S_IWGRP,
	306	tpm_show_ppi_request, tpm_store_ppi_request);
	307	static DEVICE_ATTR(transition_action, S_IRUGO,
	308	tpm_show_ppi_transition_action, NULL);
	309	static DEVICE_ATTR(response, S_IRUGO, tpm_show_ppi_response, NULL);
	310	static DEVICE_ATTR(tcg_operations, S_IRUGO, tpm_show_ppi_tcg_operations, NULL);
	311	static DEVICE_ATTR(vs_operations, S_IRUGO, tpm_show_ppi_vs_operations, NULL);
	312
	313	static struct attribute *ppi_attrs[] = {
	314	&dev_attr_version.attr,
	315	&dev_attr_request.attr,
	316	&dev_attr_transition_action.attr,
	317	&dev_attr_response.attr,
	318	&dev_attr_tcg_operations.attr,
	319	&dev_attr_vs_operations.attr, NULL,
	320	};
	321	static struct attribute_group ppi_attr_grp = {
1631cfb7	322	.name = "ppi",
f84fdff0 XZ	323	.attrs = ppi_attrs
	324	};
	325
1631cfb7	326	int tpm_add_ppi(struct kobject *parent)
f84fdff0	327	{
84b1667d JL	328	/* Cache TPM ACPI handle and version string */
84b1667d JL	329	acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX,
1569a4c4	330	ppi_callback, NULL, NULL, &tpm_ppi_handle);
f7595464	331	return tpm_ppi_handle ? sysfs_create_group(parent, &ppi_attr_grp) : 0;
1631cfb7	332	}
1631cfb7 GW	333
	334	void tpm_remove_ppi(struct kobject *parent)
	335	{
f7595464 RW	336	if (tpm_ppi_handle)
f7595464 RW	337	sysfs_remove_group(parent, &ppi_attr_grp);
f84fdff0	338	}