Root/
| 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 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9
