[linux.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);

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

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);
}

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);
}

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);
}

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);
}

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);
}

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);
}

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);
}

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);

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);
}

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 <[email protected]>");
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
	100	struct configfs_bin_attribute *acpi_table_bin_attrs[] = {
	101	&acpi_table_attr_aml,
	102	NULL,
	103	};
	104
	105	ssize_t acpi_table_signature_show(struct config_item cfg, char str)
	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
	115	ssize_t acpi_table_length_show(struct config_item cfg, char str)
	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
	125	ssize_t acpi_table_revision_show(struct config_item cfg, char str)
	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
135	ssize_t acpi_table_oem_id_show(struct config_item cfg, char str)
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
145	ssize_t acpi_table_oem_table_id_show(struct config_item cfg, char str)
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
155	ssize_t acpi_table_oem_revision_show(struct config_item cfg, char str)
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
165	ssize_t acpi_table_asl_compiler_id_show(struct config_item cfg, char str)
166	{
167	struct acpi_table_header *h = get_header(cfg);
168
169	if (!h)
170	return -EINVAL;
171
172	return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->asl_compiler_id);
173	}
174
175	ssize_t acpi_table_asl_compiler_revision_show(struct config_item *cfg,
176	char *str)
177	{
178	struct acpi_table_header *h = get_header(cfg);
179
180	if (!h)
181	return -EINVAL;
182
183	return sprintf(str, "%d\n", h->asl_compiler_revision);
184	}
185
186	CONFIGFS_ATTR_RO(acpi_table_, signature);
187	CONFIGFS_ATTR_RO(acpi_table_, length);
188	CONFIGFS_ATTR_RO(acpi_table_, revision);
189	CONFIGFS_ATTR_RO(acpi_table_, oem_id);
190	CONFIGFS_ATTR_RO(acpi_table_, oem_table_id);
191	CONFIGFS_ATTR_RO(acpi_table_, oem_revision);
192	CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_id);
193	CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_revision);
194
195	struct configfs_attribute *acpi_table_attrs[] = {
196	&acpi_table_attr_signature,
197	&acpi_table_attr_length,
198	&acpi_table_attr_revision,
199	&acpi_table_attr_oem_id,
200	&acpi_table_attr_oem_table_id,
201	&acpi_table_attr_oem_revision,
202	&acpi_table_attr_asl_compiler_id,
203	&acpi_table_attr_asl_compiler_revision,
204	NULL,
205	};
206
c1e95084	207	static const struct config_item_type acpi_table_type = {
612bd01f OP	208	.ct_owner = THIS_MODULE,
	209	.ct_bin_attrs = acpi_table_bin_attrs,
	210	.ct_attrs = acpi_table_attrs,
	211	};
	212
	213	static struct config_item acpi_table_make_item(struct config_group group,
	214	const char *name)
	215	{
	216	struct acpi_table *table;
	217
	218	table = kzalloc(sizeof(*table), GFP_KERNEL);
	219	if (!table)
	220	return ERR_PTR(-ENOMEM);
	221
	222	config_item_init_type_name(&table->cfg, name, &acpi_table_type);
	223	return &table->cfg;
	224	}
	225
772bf1e2 JK	226	static void acpi_table_drop_item(struct config_group *group,
	227	struct config_item *cfg)
	228	{
	229	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);
	230
	231	ACPI_INFO(("Host-directed Dynamic ACPI Table Unload"));
	232	acpi_tb_unload_table(table->index);
	233	}
	234
612bd01f OP	235	struct configfs_group_operations acpi_table_group_ops = {
612bd01f OP	236	.make_item = acpi_table_make_item,
772bf1e2	237	.drop_item = acpi_table_drop_item,
612bd01f OP	238	};
612bd01f OP	239
c1e95084	240	static const struct config_item_type acpi_tables_type = {
612bd01f OP	241	.ct_owner = THIS_MODULE,
	242	.ct_group_ops = &acpi_table_group_ops,
	243	};
	244
c1e95084	245	static const struct config_item_type acpi_root_group_type = {
0bf54fcd OP	246	.ct_owner = THIS_MODULE,
	247	};
	248
	249	static struct configfs_subsystem acpi_configfs = {
	250	.su_group = {
	251	.cg_item = {
	252	.ci_namebuf = "acpi",
	253	.ci_type = &acpi_root_group_type,
	254	},
	255	},
	256	.su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex),
	257	};
	258
	259	static int __init acpi_configfs_init(void)
	260	{
	261	int ret;
	262	struct config_group *root = &acpi_configfs.su_group;
	263
	264	config_group_init(root);
	265
	266	ret = configfs_register_subsystem(&acpi_configfs);
	267	if (ret)
	268	return ret;
	269
612bd01f OP	270	acpi_table_group = configfs_register_default_group(root, "table",
	271	&acpi_tables_type);
	272	return PTR_ERR_OR_ZERO(acpi_table_group);
0bf54fcd OP	273	}
	274	module_init(acpi_configfs_init);
	275
	276	static void __exit acpi_configfs_exit(void)
	277	{
612bd01f	278	configfs_unregister_default_group(acpi_table_group);
0bf54fcd OP	279	configfs_unregister_subsystem(&acpi_configfs);
	280	}
	281	module_exit(acpi_configfs_exit);
	282
	283	MODULE_AUTHOR("Octavian Purdila <[email protected]>");
	284	MODULE_DESCRIPTION("ACPI configfs support");
	285	MODULE_LICENSE("GPL v2");