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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 | |
18 | static DEFINE_IDA(soc_ida); |
19 | static DEFINE_SPINLOCK(soc_lock); |
20 | |
21 | static ssize_t soc_info_get(struct device *dev, |
22 | struct device_attribute *attr, |
23 | char *buf); |
24 | |
25 | struct soc_device { |
26 | struct device dev; |
27 | struct soc_device_attribute *attr; |
28 | int soc_dev_num; |
29 | }; |
30 | |
31 | static struct bus_type soc_bus_type = { |
32 | .name = "soc", |
33 | }; |
34 | |
35 | static DEVICE_ATTR(machine, S_IRUGO, soc_info_get, NULL); |
36 | static DEVICE_ATTR(family, S_IRUGO, soc_info_get, NULL); |
37 | static DEVICE_ATTR(soc_id, S_IRUGO, soc_info_get, NULL); |
38 | static DEVICE_ATTR(revision, S_IRUGO, soc_info_get, NULL); |
39 | |
40 | struct device *soc_device_to_device(struct soc_device *soc_dev) |
41 | { |
42 | return &soc_dev->dev; |
43 | } |
44 | |
45 | static umode_t soc_attribute_mode(struct kobject *kobj, |
46 | struct attribute *attr, |
47 | int index) |
48 | { |
49 | struct device *dev = container_of(kobj, struct device, kobj); |
50 | struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); |
51 | |
52 | if ((attr == &dev_attr_machine.attr) |
53 | && (soc_dev->attr->machine != NULL)) |
54 | return attr->mode; |
55 | if ((attr == &dev_attr_family.attr) |
56 | && (soc_dev->attr->family != NULL)) |
57 | return attr->mode; |
58 | if ((attr == &dev_attr_revision.attr) |
59 | && (soc_dev->attr->revision != NULL)) |
60 | return attr->mode; |
61 | if ((attr == &dev_attr_soc_id.attr) |
62 | && (soc_dev->attr->soc_id != NULL)) |
63 | return attr->mode; |
64 | |
65 | /* Unknown or unfilled attribute. */ |
66 | return 0; |
67 | } |
68 | |
69 | static ssize_t soc_info_get(struct device *dev, |
70 | struct device_attribute *attr, |
71 | char *buf) |
72 | { |
73 | struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); |
74 | |
75 | if (attr == &dev_attr_machine) |
76 | return sprintf(buf, "%s\n", soc_dev->attr->machine); |
77 | if (attr == &dev_attr_family) |
78 | return sprintf(buf, "%s\n", soc_dev->attr->family); |
79 | if (attr == &dev_attr_revision) |
80 | return sprintf(buf, "%s\n", soc_dev->attr->revision); |
81 | if (attr == &dev_attr_soc_id) |
82 | return sprintf(buf, "%s\n", soc_dev->attr->soc_id); |
83 | |
84 | return -EINVAL; |
85 | |
86 | } |
87 | |
88 | static struct attribute *soc_attr[] = { |
89 | &dev_attr_machine.attr, |
90 | &dev_attr_family.attr, |
91 | &dev_attr_soc_id.attr, |
92 | &dev_attr_revision.attr, |
93 | NULL, |
94 | }; |
95 | |
96 | static const struct attribute_group soc_attr_group = { |
97 | .attrs = soc_attr, |
98 | .is_visible = soc_attribute_mode, |
99 | }; |
100 | |
101 | static const struct attribute_group *soc_attr_groups[] = { |
102 | &soc_attr_group, |
103 | NULL, |
104 | }; |
105 | |
106 | static void soc_release(struct device *dev) |
107 | { |
108 | struct soc_device *soc_dev = container_of(dev, struct soc_device, dev); |
109 | |
110 | kfree(soc_dev); |
111 | } |
112 | |
113 | struct soc_device *soc_device_register(struct soc_device_attribute *soc_dev_attr) |
114 | { |
115 | struct soc_device *soc_dev; |
116 | int ret; |
117 | |
118 | soc_dev = kzalloc(sizeof(*soc_dev), GFP_KERNEL); |
119 | if (!soc_dev) { |
120 | ret = -ENOMEM; |
121 | goto out1; |
122 | } |
123 | |
124 | /* Fetch a unique (reclaimable) SOC ID. */ |
125 | do { |
126 | if (!ida_pre_get(&soc_ida, GFP_KERNEL)) { |
127 | ret = -ENOMEM; |
128 | goto out2; |
129 | } |
130 | |
131 | spin_lock(&soc_lock); |
132 | ret = ida_get_new(&soc_ida, &soc_dev->soc_dev_num); |
133 | spin_unlock(&soc_lock); |
134 | |
135 | } while (ret == -EAGAIN); |
136 | |
137 | if (ret) |
138 | goto out2; |
139 | |
140 | soc_dev->attr = soc_dev_attr; |
141 | soc_dev->dev.bus = &soc_bus_type; |
142 | soc_dev->dev.groups = soc_attr_groups; |
143 | soc_dev->dev.release = soc_release; |
144 | |
145 | dev_set_name(&soc_dev->dev, "soc%d", soc_dev->soc_dev_num); |
146 | |
147 | ret = device_register(&soc_dev->dev); |
148 | if (ret) |
149 | goto out3; |
150 | |
151 | return soc_dev; |
152 | |
153 | out3: |
154 | ida_remove(&soc_ida, soc_dev->soc_dev_num); |
155 | out2: |
156 | kfree(soc_dev); |
157 | out1: |
158 | return ERR_PTR(ret); |
159 | } |
160 | |
161 | /* Ensure soc_dev->attr is freed prior to calling soc_device_unregister. */ |
162 | void soc_device_unregister(struct soc_device *soc_dev) |
163 | { |
164 | ida_remove(&soc_ida, soc_dev->soc_dev_num); |
165 | |
166 | device_unregister(&soc_dev->dev); |
167 | } |
168 | |
169 | static int __init soc_bus_register(void) |
170 | { |
171 | return bus_register(&soc_bus_type); |
172 | } |
173 | core_initcall(soc_bus_register); |
174 | |
175 | static void __exit soc_bus_unregister(void) |
176 | { |
177 | ida_destroy(&soc_ida); |
178 | |
179 | bus_unregister(&soc_bus_type); |
180 | } |
181 | module_exit(soc_bus_unregister); |
182 |
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