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 DEFINE_SPINLOCK(soc_lock);

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,