[linux-2.6-block.git] / drivers / base / soc.c

/*
 * Copyright (C) ST-Ericsson SA 2011
 *
 * Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson.
 * License terms:  GNU General Public License (GPL), version 2
 */

#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/idr.h>
#include <linux/spinlock.h>
#include <linux/sys_soc.h>
#include <linux/err.h>

static DEFINE_IDA(soc_ida);

static ssize_t soc_info_get(struct device *dev,
			    struct device_attribute *attr,
			    char *buf);

struct soc_device {
	struct device dev;
	struct soc_device_attribute *attr;
	int soc_dev_num;
};

static struct bus_type soc_bus_type = {
	.name  = "soc",
};

static DEVICE_ATTR(machine,  S_IRUGO, soc_info_get,  NULL);
static DEVICE_ATTR(family,   S_IRUGO, soc_info_get,  NULL);
static DEVICE_ATTR(soc_id,   S_IRUGO, soc_info_get,  NULL);
static DEVICE_ATTR(revision, S_IRUGO, soc_info_get,  NULL);

struct device *soc_device_to_device(struct soc_device *soc_dev)
{
	return &soc_dev->dev;
}

static umode_t soc_attribute_mode(struct kobject *kobj,
				struct attribute *attr,
				int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);

	if ((attr == &dev_attr_machine.attr)
	    && (soc_dev->attr->machine != NULL))
		return attr->mode;
	if ((attr == &dev_attr_family.attr)
	    && (soc_dev->attr->family != NULL))
		return attr->mode;
	if ((attr == &dev_attr_revision.attr)
	    && (soc_dev->attr->revision != NULL))
		return attr->mode;
	if ((attr == &dev_attr_soc_id.attr)
	    && (soc_dev->attr->soc_id != NULL))
		return attr->mode;

	/* Unknown or unfilled attribute. */
	return 0;
}

static ssize_t soc_info_get(struct device *dev,
			    struct device_attribute *attr,
			    char *buf)
{
	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);

	if (attr == &dev_attr_machine)
		return sprintf(buf, "%s\n", soc_dev->attr->machine);
	if (attr == &dev_attr_family)
		return sprintf(buf, "%s\n", soc_dev->attr->family);
	if (attr == &dev_attr_revision)
		return sprintf(buf, "%s\n", soc_dev->attr->revision);
	if (attr == &dev_attr_soc_id)
		return sprintf(buf, "%s\n", soc_dev->attr->soc_id);

	return -EINVAL;

}

static struct attribute *soc_attr[] = {
	&dev_attr_machine.attr,
	&dev_attr_family.attr,
	&dev_attr_soc_id.attr,
	&dev_attr_revision.attr,
	NULL,
};

static const struct attribute_group soc_attr_group = {
	.attrs = soc_attr,
	.is_visible = soc_attribute_mode,
};

static const struct attribute_group *soc_attr_groups[] = {
	&soc_attr_group,
	NULL,
};

static void soc_release(struct device *dev)
{
	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);

	kfree(soc_dev);
}

struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
{
	struct soc_device *soc_dev;
	int ret;

	soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL);
	if (!soc_dev) {
		ret = -ENOMEM;
		goto out1;
	}

	/* Fetch a unique (reclaimable) SOC ID. */
	ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL);
	if (ret < 0)
		goto out2;
	soc_dev->soc_dev_num = ret;

	soc_dev->attr = soc_dev_attr;
	soc_dev->dev.bus = &soc_bus_type;
	soc_dev->dev.groups = soc_attr_groups;
	soc_dev->dev.release = soc_release;

	dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num);

	ret = device_register(&soc_dev->dev);
	if (ret)
		goto out3;

	return soc_dev;

out3:
	ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
out2:
	kfree(soc_dev);
out1:
	return ERR_PTR(ret);
}

/* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */
void soc_device_unregister(struct soc_device *soc_dev)
{
	ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);

	device_unregister(&soc_dev->dev);
}

static int __init soc_bus_register(void)
{
	return bus_register(&soc_bus_type);
}
core_initcall(soc_bus_register);

static void __exit soc_bus_unregister(void)
{
	ida_destroy(&soc_ida);

	bus_unregister(&soc_bus_type);
}
module_exit(soc_bus_unregister);
Commit	Line	Data
74d1d82c LJ	1	/*
	2	* Copyright (C) ST-Ericsson SA 2011
	3	*
	4	* Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson.
	5	* License terms: GNU General Public License (GPL), version 2
	6	*/
	7
	8	#include <linux/sysfs.h>
	9	#include <linux/module.h>
	10	#include <linux/init.h>
	11	#include <linux/stat.h>
	12	#include <linux/slab.h>
	13	#include <linux/idr.h>
	14	#include <linux/spinlock.h>
	15	#include <linux/sys_soc.h>
	16	#include <linux/err.h>
	17
3a4ffe93	18	static DEFINE_IDA(soc_ida);
74d1d82c LJ	19
	20	static ssize_t soc_info_get(struct device *dev,
	21	struct device_attribute *attr,
	22	char *buf);
	23
	24	struct soc_device {
	25	struct device dev;
	26	struct soc_device_attribute *attr;
	27	int soc_dev_num;
	28	};
	29
	30	static struct bus_type soc_bus_type = {
	31	.name = "soc",
	32	};
	33
	34	static DEVICE_ATTR(machine, S_IRUGO, soc_info_get, NULL);
	35	static DEVICE_ATTR(family, S_IRUGO, soc_info_get, NULL);
	36	static DEVICE_ATTR(soc_id, S_IRUGO, soc_info_get, NULL);
	37	static DEVICE_ATTR(revision, S_IRUGO, soc_info_get, NULL);
	38
	39	struct device soc_device_to_device(struct soc_device soc_dev)
	40	{
	41	return &soc_dev->dev;
	42	}
	43
726592a9	44	static umode_t soc_attribute_mode(struct kobject *kobj,
2071b950 LT	45	struct attribute *attr,
2071b950 LT	46	int index)
74d1d82c LJ	47	{
	48	struct device *dev = container_of(kobj, struct device, kobj);
	49	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
	50
	51	if ((attr == &dev_attr_machine.attr)
	52	&& (soc_dev->attr->machine != NULL))
	53	return attr->mode;
	54	if ((attr == &dev_attr_family.attr)
	55	&& (soc_dev->attr->family != NULL))
	56	return attr->mode;
	57	if ((attr == &dev_attr_revision.attr)
	58	&& (soc_dev->attr->revision != NULL))
	59	return attr->mode;
	60	if ((attr == &dev_attr_soc_id.attr)
	61	&& (soc_dev->attr->soc_id != NULL))
2071b950	62	return attr->mode;
74d1d82c LJ	63
	64	/* Unknown or unfilled attribute. */
	65	return 0;
	66	}
	67
	68	static ssize_t soc_info_get(struct device *dev,
	69	struct device_attribute *attr,
	70	char *buf)
	71	{
	72	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
	73
	74	if (attr == &dev_attr_machine)
	75	return sprintf(buf, "%s\n", soc_dev->attr->machine);
	76	if (attr == &dev_attr_family)
	77	return sprintf(buf, "%s\n", soc_dev->attr->family);
	78	if (attr == &dev_attr_revision)
	79	return sprintf(buf, "%s\n", soc_dev->attr->revision);
	80	if (attr == &dev_attr_soc_id)
	81	return sprintf(buf, "%s\n", soc_dev->attr->soc_id);
	82
	83	return -EINVAL;
	84
	85	}
	86
	87	static struct attribute *soc_attr[] = {
	88	&dev_attr_machine.attr,
	89	&dev_attr_family.attr,
	90	&dev_attr_soc_id.attr,
	91	&dev_attr_revision.attr,
	92	NULL,
	93	};
	94
	95	static const struct attribute_group soc_attr_group = {
	96	.attrs = soc_attr,
	97	.is_visible = soc_attribute_mode,
	98	};
	99
	100	static const struct attribute_group *soc_attr_groups[] = {
	101	&soc_attr_group,
	102	NULL,
	103	};
	104
	105	static void soc_release(struct device *dev)
	106	{
	107	struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
	108
	109	kfree(soc_dev);
	110	}
	111
	112	struct soc_device soc_device_register(struct soc_device_attribute soc_dev_attr)
	113	{
	114	struct soc_device *soc_dev;
	115	int ret;
	116
	117	soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL);
	118	if (!soc_dev) {
2071b950	119	ret = -ENOMEM;
74d1d82c LJ	120	goto out1;
	121	}
	122
	123	/* Fetch a unique (reclaimable) SOC ID. */
cfcf6a91 LD	124	ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL);
cfcf6a91 LD	125	if (ret < 0)
2071b950	126	goto out2;
cfcf6a91	127	soc_dev->soc_dev_num = ret;
74d1d82c LJ	128
	129	soc_dev->attr = soc_dev_attr;
	130	soc_dev->dev.bus = &soc_bus_type;
	131	soc_dev->dev.groups = soc_attr_groups;
	132	soc_dev->dev.release = soc_release;
	133
	134	dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num);
	135
	136	ret = device_register(&soc_dev->dev);
	137	if (ret)
	138	goto out3;
	139
	140	return soc_dev;
	141
	142	out3:
cfcf6a91	143	ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
74d1d82c LJ	144	out2:
	145	kfree(soc_dev);
	146	out1:
	147	return ERR_PTR(ret);
	148	}
	149
	150	/* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */
	151	void soc_device_unregister(struct soc_device *soc_dev)
	152	{
cfcf6a91	153	ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
74d1d82c LJ	154
	155	device_unregister(&soc_dev->dev);
	156	}
	157
	158	static int __init soc_bus_register(void)
	159	{
74d1d82c LJ	160	return bus_register(&soc_bus_type);
	161	}
	162	core_initcall(soc_bus_register);
	163
	164	static void __exit soc_bus_unregister(void)
	165	{
	166	ida_destroy(&soc_ida);
	167
	168	bus_unregister(&soc_bus_type);
	169	}
	170	module_exit(soc_bus_unregister);