[linux-2.6-block.git] / drivers / acpi / acpi_configfs.c

/*
 * ACPI configfs support
 *
 * Copyright (c) 2016 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */

#define pr_fmt(fmt) "ACPI configfs: " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/configfs.h>
#include <linux/acpi.h>

#include "acpica/accommon.h"
#include "acpica/actables.h"

static struct config_group *acpi_table_group;

struct acpi_table {
	struct config_item cfg;
	struct acpi_table_header *header;
	u32 index;
};

static ssize_t acpi_table_aml_write(struct config_item *cfg,
				    const void *data, size_t size)
{
	const struct acpi_table_header *header = data;
	struct acpi_table *table;
	int ret;

	table = container_of(cfg, struct acpi_table, cfg);

	if (table->header) {
		pr_err("table already loaded\n");
		return -EBUSY;
	}

	if (header->length != size) {
		pr_err("invalid table length\n");
		return -EINVAL;
	}

	if (memcmp(header->signature, ACPI_SIG_SSDT, 4)) {
		pr_err("invalid table signature\n");
		return -EINVAL;
	}

	table = container_of(cfg, struct acpi_table, cfg);

	table->header = kmemdup(header, header->length, GFP_KERNEL);
	if (!table->header)
		return -ENOMEM;

	ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
	ret = acpi_tb_install_and_load_table(
			ACPI_PTR_TO_PHYSADDR(table->header),
			ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, FALSE,
			&table->index);
	if (ret) {
		kfree(table->header);
		table->header = NULL;
	}

	return ret;
}

static inline struct acpi_table_header *get_header(struct config_item *cfg)
{
	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);

	if (!table->header)
		pr_err("table not loaded\n");

	return table->header;
}

static ssize_t acpi_table_aml_read(struct config_item *cfg,
				   void *data, size_t size)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	if (data)
		memcpy(data, h, h->length);

	return h->length;
}

#define MAX_ACPI_TABLE_SIZE (128 * 1024)

CONFIGFS_BIN_ATTR(acpi_table_, aml, NULL, MAX_ACPI_TABLE_SIZE);

static struct configfs_bin_attribute *acpi_table_bin_attrs[] = {
	&acpi_table_attr_aml,
	NULL,
};

static ssize_t acpi_table_signature_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->signature);
}

static ssize_t acpi_table_length_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%d\n", h->length);
}

static ssize_t acpi_table_revision_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%d\n", h->revision);
}

static ssize_t acpi_table_oem_id_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%.*s\n", ACPI_OEM_ID_SIZE, h->oem_id);
}

static ssize_t acpi_table_oem_table_id_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%.*s\n", ACPI_OEM_TABLE_ID_SIZE, h->oem_table_id);
}

static ssize_t acpi_table_oem_revision_show(struct config_item *cfg, char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%d\n", h->oem_revision);
}

static ssize_t acpi_table_asl_compiler_id_show(struct config_item *cfg,
					       char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->asl_compiler_id);
}

static ssize_t acpi_table_asl_compiler_revision_show(struct config_item *cfg,
						     char *str)
{
	struct acpi_table_header *h = get_header(cfg);

	if (!h)
		return -EINVAL;

	return sprintf(str, "%d\n", h->asl_compiler_revision);
}

CONFIGFS_ATTR_RO(acpi_table_, signature);
CONFIGFS_ATTR_RO(acpi_table_, length);
CONFIGFS_ATTR_RO(acpi_table_, revision);
CONFIGFS_ATTR_RO(acpi_table_, oem_id);
CONFIGFS_ATTR_RO(acpi_table_, oem_table_id);
CONFIGFS_ATTR_RO(acpi_table_, oem_revision);
CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_id);
CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_revision);

static struct configfs_attribute *acpi_table_attrs[] = {
	&acpi_table_attr_signature,
	&acpi_table_attr_length,
	&acpi_table_attr_revision,
	&acpi_table_attr_oem_id,
	&acpi_table_attr_oem_table_id,
	&acpi_table_attr_oem_revision,
	&acpi_table_attr_asl_compiler_id,
	&acpi_table_attr_asl_compiler_revision,
	NULL,
};

static const struct config_item_type acpi_table_type = {
	.ct_owner = THIS_MODULE,
	.ct_bin_attrs = acpi_table_bin_attrs,
	.ct_attrs = acpi_table_attrs,
};

static struct config_item *acpi_table_make_item(struct config_group *group,
						const char *name)
{
	struct acpi_table *table;

	table = kzalloc(sizeof(*table), GFP_KERNEL);
	if (!table)
		return ERR_PTR(-ENOMEM);

	config_item_init_type_name(&table->cfg, name, &acpi_table_type);
	return &table->cfg;
}

static void acpi_table_drop_item(struct config_group *group,
				 struct config_item *cfg)
{
	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);

	ACPI_INFO(("Host-directed Dynamic ACPI Table Unload"));
	acpi_tb_unload_table(table->index);
}

static struct configfs_group_operations acpi_table_group_ops = {
	.make_item = acpi_table_make_item,
	.drop_item = acpi_table_drop_item,
};

static const struct config_item_type acpi_tables_type = {
	.ct_owner = THIS_MODULE,
	.ct_group_ops = &acpi_table_group_ops,
};

static const struct config_item_type acpi_root_group_type = {
	.ct_owner = THIS_MODULE,
};

static struct configfs_subsystem acpi_configfs = {
	.su_group = {
		.cg_item = {
			.ci_namebuf = "acpi",
			.ci_type = &acpi_root_group_type,
		},
	},
	.su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex),
};

static int __init acpi_configfs_init(void)
{
	int ret;
	struct config_group *root = &acpi_configfs.su_group;

	config_group_init(root);

	ret = configfs_register_subsystem(&acpi_configfs);
	if (ret)
		return ret;

	acpi_table_group = configfs_register_default_group(root, "table",
							   &acpi_tables_type);
	return PTR_ERR_OR_ZERO(acpi_table_group);
}
module_init(acpi_configfs_init);

static void __exit acpi_configfs_exit(void)
{
	configfs_unregister_default_group(acpi_table_group);
	configfs_unregister_subsystem(&acpi_configfs);
}
module_exit(acpi_configfs_exit);

MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
MODULE_DESCRIPTION("ACPI configfs support");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
0bf54fcd OP	1	/*
	2	* ACPI configfs support
	3	*
	4	* Copyright (c) 2016 Intel Corporation
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License version 2 as published by
	8	* the Free Software Foundation.
	9	*/
	10
612bd01f OP	11	#define pr_fmt(fmt) "ACPI configfs: " fmt
612bd01f OP	12
0bf54fcd OP	13	#include <linux/init.h>
	14	#include <linux/module.h>
	15	#include <linux/configfs.h>
	16	#include <linux/acpi.h>
	17
772bf1e2 JK	18	#include "acpica/accommon.h"
	19	#include "acpica/actables.h"
	20
612bd01f OP	21	static struct config_group *acpi_table_group;
	22
	23	struct acpi_table {
	24	struct config_item cfg;
	25	struct acpi_table_header *header;
772bf1e2	26	u32 index;
612bd01f OP	27	};
	28
	29	static ssize_t acpi_table_aml_write(struct config_item *cfg,
	30	const void *data, size_t size)
	31	{
	32	const struct acpi_table_header *header = data;
	33	struct acpi_table *table;
	34	int ret;
	35
	36	table = container_of(cfg, struct acpi_table, cfg);
	37
	38	if (table->header) {
	39	pr_err("table already loaded\n");
	40	return -EBUSY;
	41	}
	42
	43	if (header->length != size) {
	44	pr_err("invalid table length\n");
	45	return -EINVAL;
	46	}
	47
	48	if (memcmp(header->signature, ACPI_SIG_SSDT, 4)) {
	49	pr_err("invalid table signature\n");
	50	return -EINVAL;
	51	}
	52
	53	table = container_of(cfg, struct acpi_table, cfg);
	54
	55	table->header = kmemdup(header, header->length, GFP_KERNEL);
	56	if (!table->header)
	57	return -ENOMEM;
	58
772bf1e2 JK	59	ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
	60	ret = acpi_tb_install_and_load_table(
	61	ACPI_PTR_TO_PHYSADDR(table->header),
	62	ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, FALSE,
	63	&table->index);
612bd01f OP	64	if (ret) {
	65	kfree(table->header);
	66	table->header = NULL;
	67	}
	68
	69	return ret;
	70	}
	71
	72	static inline struct acpi_table_header get_header(struct config_item cfg)
	73	{
	74	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);
	75
	76	if (!table->header)
	77	pr_err("table not loaded\n");
	78
	79	return table->header;
	80	}
	81
	82	static ssize_t acpi_table_aml_read(struct config_item *cfg,
	83	void *data, size_t size)
	84	{
	85	struct acpi_table_header *h = get_header(cfg);
	86
	87	if (!h)
	88	return -EINVAL;
	89
	90	if (data)
	91	memcpy(data, h, h->length);
	92
	93	return h->length;
	94	}
	95
	96	#define MAX_ACPI_TABLE_SIZE (128 * 1024)
	97
	98	CONFIGFS_BIN_ATTR(acpi_table_, aml, NULL, MAX_ACPI_TABLE_SIZE);
	99
bf567dd3	100	static struct configfs_bin_attribute *acpi_table_bin_attrs[] = {
612bd01f OP	101	&acpi_table_attr_aml,
	102	NULL,
	103	};
	104
c62c15a9	105	static ssize_t acpi_table_signature_show(struct config_item cfg, char str)
612bd01f OP	106	{
	107	struct acpi_table_header *h = get_header(cfg);
	108
	109	if (!h)
	110	return -EINVAL;
	111
	112	return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->signature);
	113	}
	114
c62c15a9	115	static ssize_t acpi_table_length_show(struct config_item cfg, char str)
612bd01f OP	116	{
	117	struct acpi_table_header *h = get_header(cfg);
	118
	119	if (!h)
	120	return -EINVAL;
	121
	122	return sprintf(str, "%d\n", h->length);
	123	}
	124
c62c15a9	125	static ssize_t acpi_table_revision_show(struct config_item cfg, char str)
612bd01f OP	126	{
	127	struct acpi_table_header *h = get_header(cfg);
	128
	129	if (!h)
	130	return -EINVAL;
	131
	132	return sprintf(str, "%d\n", h->revision);
	133	}
	134
c62c15a9	135	static ssize_t acpi_table_oem_id_show(struct config_item cfg, char str)
612bd01f OP	136	{
	137	struct acpi_table_header *h = get_header(cfg);
	138
	139	if (!h)
	140	return -EINVAL;
	141
	142	return sprintf(str, "%.*s\n", ACPI_OEM_ID_SIZE, h->oem_id);
	143	}
	144
c62c15a9	145	static ssize_t acpi_table_oem_table_id_show(struct config_item cfg, char str)
612bd01f OP	146	{
	147	struct acpi_table_header *h = get_header(cfg);
	148
	149	if (!h)
	150	return -EINVAL;
	151
	152	return sprintf(str, "%.*s\n", ACPI_OEM_TABLE_ID_SIZE, h->oem_table_id);
	153	}
	154
c62c15a9	155	static ssize_t acpi_table_oem_revision_show(struct config_item cfg, char str)
612bd01f OP	156	{
	157	struct acpi_table_header *h = get_header(cfg);
	158
	159	if (!h)
	160	return -EINVAL;
	161
	162	return sprintf(str, "%d\n", h->oem_revision);
	163	}
	164
c62c15a9 AS	165	static ssize_t acpi_table_asl_compiler_id_show(struct config_item *cfg,
c62c15a9 AS	166	char *str)
612bd01f OP	167	{
	168	struct acpi_table_header *h = get_header(cfg);
	169
	170	if (!h)
	171	return -EINVAL;
	172
	173	return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->asl_compiler_id);
	174	}
	175
c62c15a9 AS	176	static ssize_t acpi_table_asl_compiler_revision_show(struct config_item *cfg,
c62c15a9 AS	177	char *str)
612bd01f OP	178	{
	179	struct acpi_table_header *h = get_header(cfg);
	180
	181	if (!h)
	182	return -EINVAL;
	183
	184	return sprintf(str, "%d\n", h->asl_compiler_revision);
	185	}
	186
	187	CONFIGFS_ATTR_RO(acpi_table_, signature);
	188	CONFIGFS_ATTR_RO(acpi_table_, length);
	189	CONFIGFS_ATTR_RO(acpi_table_, revision);
	190	CONFIGFS_ATTR_RO(acpi_table_, oem_id);
	191	CONFIGFS_ATTR_RO(acpi_table_, oem_table_id);
	192	CONFIGFS_ATTR_RO(acpi_table_, oem_revision);
	193	CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_id);
	194	CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_revision);
	195
bf567dd3	196	static struct configfs_attribute *acpi_table_attrs[] = {
612bd01f OP	197	&acpi_table_attr_signature,
	198	&acpi_table_attr_length,
	199	&acpi_table_attr_revision,
	200	&acpi_table_attr_oem_id,
	201	&acpi_table_attr_oem_table_id,
	202	&acpi_table_attr_oem_revision,
	203	&acpi_table_attr_asl_compiler_id,
	204	&acpi_table_attr_asl_compiler_revision,
	205	NULL,
	206	};
	207
c1e95084	208	static const struct config_item_type acpi_table_type = {
612bd01f OP	209	.ct_owner = THIS_MODULE,
	210	.ct_bin_attrs = acpi_table_bin_attrs,
	211	.ct_attrs = acpi_table_attrs,
	212	};
	213
	214	static struct config_item acpi_table_make_item(struct config_group group,
	215	const char *name)
	216	{
	217	struct acpi_table *table;
	218
	219	table = kzalloc(sizeof(*table), GFP_KERNEL);
	220	if (!table)
	221	return ERR_PTR(-ENOMEM);
	222
	223	config_item_init_type_name(&table->cfg, name, &acpi_table_type);
	224	return &table->cfg;
	225	}
	226
772bf1e2 JK	227	static void acpi_table_drop_item(struct config_group *group,
	228	struct config_item *cfg)
	229	{
	230	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);
	231
	232	ACPI_INFO(("Host-directed Dynamic ACPI Table Unload"));
	233	acpi_tb_unload_table(table->index);
	234	}
	235
bf567dd3	236	static struct configfs_group_operations acpi_table_group_ops = {
612bd01f	237	.make_item = acpi_table_make_item,
772bf1e2	238	.drop_item = acpi_table_drop_item,
612bd01f OP	239	};
612bd01f OP	240
c1e95084	241	static const struct config_item_type acpi_tables_type = {
612bd01f OP	242	.ct_owner = THIS_MODULE,
	243	.ct_group_ops = &acpi_table_group_ops,
	244	};
	245
c1e95084	246	static const struct config_item_type acpi_root_group_type = {
0bf54fcd OP	247	.ct_owner = THIS_MODULE,
	248	};
	249
	250	static struct configfs_subsystem acpi_configfs = {
	251	.su_group = {
	252	.cg_item = {
	253	.ci_namebuf = "acpi",
	254	.ci_type = &acpi_root_group_type,
	255	},
	256	},
	257	.su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex),
	258	};
	259
	260	static int __init acpi_configfs_init(void)
	261	{
	262	int ret;
	263	struct config_group *root = &acpi_configfs.su_group;
	264
	265	config_group_init(root);
	266
	267	ret = configfs_register_subsystem(&acpi_configfs);
	268	if (ret)
	269	return ret;
	270
612bd01f OP	271	acpi_table_group = configfs_register_default_group(root, "table",
	272	&acpi_tables_type);
	273	return PTR_ERR_OR_ZERO(acpi_table_group);
0bf54fcd OP	274	}
	275	module_init(acpi_configfs_init);
	276
	277	static void __exit acpi_configfs_exit(void)
	278	{
612bd01f	279	configfs_unregister_default_group(acpi_table_group);
0bf54fcd OP	280	configfs_unregister_subsystem(&acpi_configfs);
	281	}
	282	module_exit(acpi_configfs_exit);
	283
	284	MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
	285	MODULE_DESCRIPTION("ACPI configfs support");
	286	MODULE_LICENSE("GPL v2");