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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, |
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); |
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); |