[mirror_ubuntu-zesty-kernel.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>

static struct config_group *acpi_table_group;

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

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;

	ret = acpi_load_table(table->header);
	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 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;
}

struct configfs_group_operations acpi_table_group_ops = {
	.make_item = acpi_table_make_item,
};

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

static 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
612bd01f OP	18	static struct config_group *acpi_table_group;
	19
	20	struct acpi_table {
	21	struct config_item cfg;
	22	struct acpi_table_header *header;
	23	};
	24
	25	static ssize_t acpi_table_aml_write(struct config_item *cfg,
	26	const void *data, size_t size)
	27	{
	28	const struct acpi_table_header *header = data;
	29	struct acpi_table *table;
	30	int ret;
	31
	32	table = container_of(cfg, struct acpi_table, cfg);
	33
	34	if (table->header) {
	35	pr_err("table already loaded\n");
	36	return -EBUSY;
	37	}
	38
	39	if (header->length != size) {
	40	pr_err("invalid table length\n");
	41	return -EINVAL;
	42	}
	43
	44	if (memcmp(header->signature, ACPI_SIG_SSDT, 4)) {
	45	pr_err("invalid table signature\n");
	46	return -EINVAL;
	47	}
	48
	49	table = container_of(cfg, struct acpi_table, cfg);
	50
	51	table->header = kmemdup(header, header->length, GFP_KERNEL);
	52	if (!table->header)
	53	return -ENOMEM;
	54
	55	ret = acpi_load_table(table->header);
	56	if (ret) {
	57	kfree(table->header);
	58	table->header = NULL;
	59	}
	60
	61	return ret;
	62	}
	63
	64	static inline struct acpi_table_header get_header(struct config_item cfg)
	65	{
	66	struct acpi_table *table = container_of(cfg, struct acpi_table, cfg);
	67
	68	if (!table->header)
	69	pr_err("table not loaded\n");
	70
	71	return table->header;
	72	}
	73
	74	static ssize_t acpi_table_aml_read(struct config_item *cfg,
	75	void *data, size_t size)
	76	{
	77	struct acpi_table_header *h = get_header(cfg);
	78
	79	if (!h)
	80	return -EINVAL;
	81
82	if (data)
83	memcpy(data, h, h->length);
84
85	return h->length;
86	}
87
88	#define MAX_ACPI_TABLE_SIZE (128 * 1024)
89
90	CONFIGFS_BIN_ATTR(acpi_table_, aml, NULL, MAX_ACPI_TABLE_SIZE);
91
92	struct configfs_bin_attribute *acpi_table_bin_attrs[] = {
93	&acpi_table_attr_aml,
94	NULL,
95	};
96
97	ssize_t acpi_table_signature_show(struct config_item cfg, char str)
98	{
99	struct acpi_table_header *h = get_header(cfg);
100
101	if (!h)
102	return -EINVAL;
103
104	return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->signature);
105	}
106
107	ssize_t acpi_table_length_show(struct config_item cfg, char str)
108	{
109	struct acpi_table_header *h = get_header(cfg);
110
111	if (!h)
112	return -EINVAL;
113
114	return sprintf(str, "%d\n", h->length);
115	}
116
117	ssize_t acpi_table_revision_show(struct config_item cfg, char str)
118	{
119	struct acpi_table_header *h = get_header(cfg);
120
121	if (!h)
122	return -EINVAL;
123
124	return sprintf(str, "%d\n", h->revision);
125	}
126
127	ssize_t acpi_table_oem_id_show(struct config_item cfg, char str)
128	{
129	struct acpi_table_header *h = get_header(cfg);
130
131	if (!h)
132	return -EINVAL;
133
134	return sprintf(str, "%.*s\n", ACPI_OEM_ID_SIZE, h->oem_id);
135	}
136
137	ssize_t acpi_table_oem_table_id_show(struct config_item cfg, char str)
138	{
139	struct acpi_table_header *h = get_header(cfg);
140
141	if (!h)
142	return -EINVAL;
143
144	return sprintf(str, "%.*s\n", ACPI_OEM_TABLE_ID_SIZE, h->oem_table_id);
145	}
146
147	ssize_t acpi_table_oem_revision_show(struct config_item cfg, char str)
148	{
149	struct acpi_table_header *h = get_header(cfg);
150
151	if (!h)
152	return -EINVAL;
153
154	return sprintf(str, "%d\n", h->oem_revision);
155	}
156
157	ssize_t acpi_table_asl_compiler_id_show(struct config_item cfg, char str)
158	{
159	struct acpi_table_header *h = get_header(cfg);
160
161	if (!h)
162	return -EINVAL;
163
164	return sprintf(str, "%.*s\n", ACPI_NAME_SIZE, h->asl_compiler_id);
165	}
166
167	ssize_t acpi_table_asl_compiler_revision_show(struct config_item *cfg,
168	char *str)
169	{
170	struct acpi_table_header *h = get_header(cfg);
171
172	if (!h)
173	return -EINVAL;
174
175	return sprintf(str, "%d\n", h->asl_compiler_revision);
176	}
177
178	CONFIGFS_ATTR_RO(acpi_table_, signature);
179	CONFIGFS_ATTR_RO(acpi_table_, length);
180	CONFIGFS_ATTR_RO(acpi_table_, revision);
181	CONFIGFS_ATTR_RO(acpi_table_, oem_id);
182	CONFIGFS_ATTR_RO(acpi_table_, oem_table_id);
183	CONFIGFS_ATTR_RO(acpi_table_, oem_revision);
184	CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_id);
185	CONFIGFS_ATTR_RO(acpi_table_, asl_compiler_revision);
186
187	struct configfs_attribute *acpi_table_attrs[] = {
188	&acpi_table_attr_signature,
189	&acpi_table_attr_length,
190	&acpi_table_attr_revision,
191	&acpi_table_attr_oem_id,
192	&acpi_table_attr_oem_table_id,
193	&acpi_table_attr_oem_revision,
194	&acpi_table_attr_asl_compiler_id,
195	&acpi_table_attr_asl_compiler_revision,
196	NULL,
197	};
198
199	static struct config_item_type acpi_table_type = {
200	.ct_owner = THIS_MODULE,
201	.ct_bin_attrs = acpi_table_bin_attrs,
202	.ct_attrs = acpi_table_attrs,
203	};
204
205	static struct config_item acpi_table_make_item(struct config_group group,
206	const char *name)
207	{
208	struct acpi_table *table;
209
210	table = kzalloc(sizeof(*table), GFP_KERNEL);
211	if (!table)
212	return ERR_PTR(-ENOMEM);
213
214	config_item_init_type_name(&table->cfg, name, &acpi_table_type);
215	return &table->cfg;
216	}
217
218	struct configfs_group_operations acpi_table_group_ops = {
219	.make_item = acpi_table_make_item,
220	};
221
222	static struct config_item_type acpi_tables_type = {
223	.ct_owner = THIS_MODULE,
224	.ct_group_ops = &acpi_table_group_ops,
225	};
226
0bf54fcd OP	227	static struct config_item_type acpi_root_group_type = {
	228	.ct_owner = THIS_MODULE,
	229	};
	230
	231	static struct configfs_subsystem acpi_configfs = {
	232	.su_group = {
	233	.cg_item = {
	234	.ci_namebuf = "acpi",
	235	.ci_type = &acpi_root_group_type,
	236	},
	237	},
	238	.su_mutex = __MUTEX_INITIALIZER(acpi_configfs.su_mutex),
	239	};
	240
	241	static int __init acpi_configfs_init(void)
	242	{
	243	int ret;
	244	struct config_group *root = &acpi_configfs.su_group;
	245
	246	config_group_init(root);
	247
	248	ret = configfs_register_subsystem(&acpi_configfs);
	249	if (ret)
	250	return ret;
	251
612bd01f OP	252	acpi_table_group = configfs_register_default_group(root, "table",
	253	&acpi_tables_type);
	254	return PTR_ERR_OR_ZERO(acpi_table_group);
0bf54fcd OP	255	}
	256	module_init(acpi_configfs_init);
	257
	258	static void __exit acpi_configfs_exit(void)
	259	{
612bd01f	260	configfs_unregister_default_group(acpi_table_group);
0bf54fcd OP	261	configfs_unregister_subsystem(&acpi_configfs);
	262	}
	263	module_exit(acpi_configfs_exit);
	264
	265	MODULE_AUTHOR("Octavian Purdila <octavian.purdila@intel.com>");
	266	MODULE_DESCRIPTION("ACPI configfs support");
	267	MODULE_LICENSE("GPL v2");