2 * Copyright (C) ST-Ericsson SA 2011
4 * Author: Lee Jones <lee.jones@linaro.org> for ST-Ericsson.
5 * License terms: GNU General Public License (GPL), version 2
8 #include <linux/sysfs.h>
9 #include <linux/init.h>
10 #include <linux/stat.h>
11 #include <linux/slab.h>
12 #include <linux/idr.h>
13 #include <linux/spinlock.h>
14 #include <linux/sys_soc.h>
15 #include <linux/err.h>
17 static DEFINE_IDA(soc_ida);
19 static ssize_t soc_info_get(struct device *dev,
20 struct device_attribute *attr,
25 struct soc_device_attribute *attr;
29 static struct bus_type soc_bus_type = {
33 static DEVICE_ATTR(machine, S_IRUGO, soc_info_get, NULL);
34 static DEVICE_ATTR(family, S_IRUGO, soc_info_get, NULL);
35 static DEVICE_ATTR(soc_id, S_IRUGO, soc_info_get, NULL);
36 static DEVICE_ATTR(revision, S_IRUGO, soc_info_get, NULL);
38 struct device *soc_device_to_device(struct soc_device *soc_dev)
43 static umode_t soc_attribute_mode(struct kobject *kobj,
44 struct attribute *attr,
47 struct device *dev = container_of(kobj, struct device, kobj);
48 struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
50 if ((attr == &dev_attr_machine.attr)
51 && (soc_dev->attr->machine != NULL))
53 if ((attr == &dev_attr_family.attr)
54 && (soc_dev->attr->family != NULL))
56 if ((attr == &dev_attr_revision.attr)
57 && (soc_dev->attr->revision != NULL))
59 if ((attr == &dev_attr_soc_id.attr)
60 && (soc_dev->attr->soc_id != NULL))
63 /* Unknown or unfilled attribute. */
67 static ssize_t soc_info_get(struct device *dev,
68 struct device_attribute *attr,
71 struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
73 if (attr == &dev_attr_machine)
74 return sprintf(buf, "%s\n", soc_dev->attr->machine);
75 if (attr == &dev_attr_family)
76 return sprintf(buf, "%s\n", soc_dev->attr->family);
77 if (attr == &dev_attr_revision)
78 return sprintf(buf, "%s\n", soc_dev->attr->revision);
79 if (attr == &dev_attr_soc_id)
80 return sprintf(buf, "%s\n", soc_dev->attr->soc_id);
86 static struct attribute *soc_attr[] = {
87 &dev_attr_machine.attr,
88 &dev_attr_family.attr,
89 &dev_attr_soc_id.attr,
90 &dev_attr_revision.attr,
94 static const struct attribute_group soc_attr_group = {
96 .is_visible = soc_attribute_mode,
99 static const struct attribute_group *soc_attr_groups[] = {
104 static void soc_release(struct device *dev)
106 struct soc_device *soc_dev = container_of(dev, struct soc_device, dev);
111 struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr)
113 struct soc_device *soc_dev;
116 soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL);
122 /* Fetch a unique (reclaimable) SOC ID. */
123 ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL);
126 soc_dev->soc_dev_num = ret;
128 soc_dev->attr = soc_dev_attr;
129 soc_dev->dev.bus = &soc_bus_type;
130 soc_dev->dev.groups = soc_attr_groups;
131 soc_dev->dev.release = soc_release;
133 dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num);
135 ret = device_register(&soc_dev->dev);
142 ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
148 EXPORT_SYMBOL_GPL(soc_device_register);
150 /* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */
151 void soc_device_unregister(struct soc_device *soc_dev)
153 ida_simple_remove(&soc_ida, soc_dev->soc_dev_num);
155 device_unregister(&soc_dev->dev);
157 EXPORT_SYMBOL_GPL(soc_device_unregister);
159 static int __init soc_bus_register(void)
161 return bus_register(&soc_bus_type);
163 core_initcall(soc_bus_register);