Commit | Line | Data |
---|---|---|
4e10d12a DSL |
1 | /* |
2 | * Link physical devices with ACPI devices support | |
3 | * | |
4 | * Copyright (c) 2005 David Shaohua Li <shaohua.li@intel.com> | |
5 | * Copyright (c) 2005 Intel Corp. | |
6 | * | |
7 | * This file is released under the GPLv2. | |
8 | */ | |
214f2c90 | 9 | #include <linux/export.h> |
4e10d12a DSL |
10 | #include <linux/init.h> |
11 | #include <linux/list.h> | |
12 | #include <linux/device.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
4e10d12a DSL |
14 | #include <linux/rwsem.h> |
15 | #include <linux/acpi.h> | |
16 | ||
a192a958 LB |
17 | #include "internal.h" |
18 | ||
4e10d12a DSL |
19 | #define ACPI_GLUE_DEBUG 0 |
20 | #if ACPI_GLUE_DEBUG | |
23415eb5 JP |
21 | #define DBG(fmt, ...) \ |
22 | printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__) | |
4e10d12a | 23 | #else |
23415eb5 JP |
24 | #define DBG(fmt, ...) \ |
25 | do { \ | |
26 | if (0) \ | |
27 | printk(KERN_DEBUG PREFIX fmt, ##__VA_ARGS__); \ | |
28 | } while (0) | |
4e10d12a DSL |
29 | #endif |
30 | static LIST_HEAD(bus_type_list); | |
31 | static DECLARE_RWSEM(bus_type_sem); | |
32 | ||
1033f904 LT |
33 | #define PHYSICAL_NODE_STRING "physical_node" |
34 | ||
4e10d12a DSL |
35 | int register_acpi_bus_type(struct acpi_bus_type *type) |
36 | { | |
37 | if (acpi_disabled) | |
38 | return -ENODEV; | |
53540098 | 39 | if (type && type->match && type->find_device) { |
4e10d12a DSL |
40 | down_write(&bus_type_sem); |
41 | list_add_tail(&type->list, &bus_type_list); | |
42 | up_write(&bus_type_sem); | |
53540098 | 43 | printk(KERN_INFO PREFIX "bus type %s registered\n", type->name); |
4e10d12a DSL |
44 | return 0; |
45 | } | |
46 | return -ENODEV; | |
47 | } | |
91e4d5a1 | 48 | EXPORT_SYMBOL_GPL(register_acpi_bus_type); |
4e10d12a | 49 | |
4e10d12a DSL |
50 | int unregister_acpi_bus_type(struct acpi_bus_type *type) |
51 | { | |
52 | if (acpi_disabled) | |
53 | return 0; | |
54 | if (type) { | |
55 | down_write(&bus_type_sem); | |
56 | list_del_init(&type->list); | |
57 | up_write(&bus_type_sem); | |
53540098 RW |
58 | printk(KERN_INFO PREFIX "bus type %s unregistered\n", |
59 | type->name); | |
4e10d12a DSL |
60 | return 0; |
61 | } | |
62 | return -ENODEV; | |
63 | } | |
91e4d5a1 | 64 | EXPORT_SYMBOL_GPL(unregister_acpi_bus_type); |
4e10d12a | 65 | |
53540098 | 66 | static struct acpi_bus_type *acpi_get_bus_type(struct device *dev) |
4e10d12a DSL |
67 | { |
68 | struct acpi_bus_type *tmp, *ret = NULL; | |
69 | ||
70 | down_read(&bus_type_sem); | |
71 | list_for_each_entry(tmp, &bus_type_list, list) { | |
53540098 | 72 | if (tmp->match(dev)) { |
4e10d12a DSL |
73 | ret = tmp; |
74 | break; | |
75 | } | |
76 | } | |
77 | up_read(&bus_type_sem); | |
78 | return ret; | |
79 | } | |
80 | ||
33f767d7 RW |
81 | static acpi_status do_acpi_find_child(acpi_handle handle, u32 lvl_not_used, |
82 | void *addr_p, void **ret_p) | |
4e10d12a | 83 | { |
c7d9ca90 | 84 | unsigned long long addr, sta; |
4e10d12a | 85 | acpi_status status; |
33f767d7 RW |
86 | |
87 | status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &addr); | |
88 | if (ACPI_SUCCESS(status) && addr == *((u64 *)addr_p)) { | |
89 | *ret_p = handle; | |
c7d9ca90 JW |
90 | status = acpi_bus_get_status_handle(handle, &sta); |
91 | if (ACPI_SUCCESS(status) && (sta & ACPI_STA_DEVICE_ENABLED)) | |
92 | return AE_CTRL_TERMINATE; | |
4e10d12a DSL |
93 | } |
94 | return AE_OK; | |
95 | } | |
96 | ||
439913ff | 97 | acpi_handle acpi_get_child(acpi_handle parent, u64 address) |
4e10d12a | 98 | { |
33f767d7 | 99 | void *ret = NULL; |
4e10d12a DSL |
100 | |
101 | if (!parent) | |
102 | return NULL; | |
4e10d12a | 103 | |
33f767d7 RW |
104 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, 1, NULL, |
105 | do_acpi_find_child, &address, &ret); | |
106 | return (acpi_handle)ret; | |
107 | } | |
4e10d12a DSL |
108 | EXPORT_SYMBOL(acpi_get_child); |
109 | ||
ac212b69 | 110 | int acpi_bind_one(struct device *dev, acpi_handle handle) |
4e10d12a | 111 | { |
1071695f | 112 | struct acpi_device *acpi_dev; |
4e10d12a | 113 | acpi_status status; |
f3fd0c8a | 114 | struct acpi_device_physical_node *physical_node, *pn; |
1033f904 LT |
115 | char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2]; |
116 | int retval = -EINVAL; | |
4e10d12a | 117 | |
95f8a082 | 118 | if (ACPI_HANDLE(dev)) { |
f3fd0c8a RW |
119 | if (handle) { |
120 | dev_warn(dev, "ACPI handle is already set\n"); | |
121 | return -EINVAL; | |
122 | } else { | |
95f8a082 | 123 | handle = ACPI_HANDLE(dev); |
f3fd0c8a | 124 | } |
4e10d12a | 125 | } |
f3fd0c8a RW |
126 | if (!handle) |
127 | return -EINVAL; | |
1033f904 | 128 | |
4e10d12a | 129 | get_device(dev); |
1033f904 LT |
130 | status = acpi_bus_get_device(handle, &acpi_dev); |
131 | if (ACPI_FAILURE(status)) | |
132 | goto err; | |
133 | ||
f3fd0c8a | 134 | physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL); |
1033f904 LT |
135 | if (!physical_node) { |
136 | retval = -ENOMEM; | |
137 | goto err; | |
4e10d12a | 138 | } |
4e10d12a | 139 | |
1033f904 | 140 | mutex_lock(&acpi_dev->physical_node_lock); |
f3fd0c8a RW |
141 | |
142 | /* Sanity check. */ | |
143 | list_for_each_entry(pn, &acpi_dev->physical_node_list, node) | |
144 | if (pn->dev == dev) { | |
145 | dev_warn(dev, "Already associated with ACPI node\n"); | |
146 | goto err_free; | |
147 | } | |
148 | ||
1033f904 LT |
149 | /* allocate physical node id according to physical_node_id_bitmap */ |
150 | physical_node->node_id = | |
151 | find_first_zero_bit(acpi_dev->physical_node_id_bitmap, | |
152 | ACPI_MAX_PHYSICAL_NODE); | |
153 | if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) { | |
154 | retval = -ENOSPC; | |
f3fd0c8a | 155 | goto err_free; |
1071695f DB |
156 | } |
157 | ||
1033f904 LT |
158 | set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap); |
159 | physical_node->dev = dev; | |
160 | list_add_tail(&physical_node->node, &acpi_dev->physical_node_list); | |
161 | acpi_dev->physical_node_count++; | |
f3fd0c8a | 162 | |
1033f904 LT |
163 | mutex_unlock(&acpi_dev->physical_node_lock); |
164 | ||
95f8a082 RW |
165 | if (!ACPI_HANDLE(dev)) |
166 | ACPI_HANDLE_SET(dev, acpi_dev->handle); | |
1033f904 LT |
167 | |
168 | if (!physical_node->node_id) | |
169 | strcpy(physical_node_name, PHYSICAL_NODE_STRING); | |
170 | else | |
171 | sprintf(physical_node_name, | |
172 | "physical_node%d", physical_node->node_id); | |
173 | retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, | |
174 | physical_node_name); | |
175 | retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, | |
176 | "firmware_node"); | |
177 | ||
178 | if (acpi_dev->wakeup.flags.valid) | |
179 | device_set_wakeup_capable(dev, true); | |
180 | ||
4e10d12a | 181 | return 0; |
1033f904 LT |
182 | |
183 | err: | |
95f8a082 | 184 | ACPI_HANDLE_SET(dev, NULL); |
1033f904 LT |
185 | put_device(dev); |
186 | return retval; | |
f3fd0c8a RW |
187 | |
188 | err_free: | |
189 | mutex_unlock(&acpi_dev->physical_node_lock); | |
190 | kfree(physical_node); | |
191 | goto err; | |
4e10d12a | 192 | } |
ac212b69 | 193 | EXPORT_SYMBOL_GPL(acpi_bind_one); |
4e10d12a | 194 | |
ac212b69 | 195 | int acpi_unbind_one(struct device *dev) |
4e10d12a | 196 | { |
1033f904 LT |
197 | struct acpi_device_physical_node *entry; |
198 | struct acpi_device *acpi_dev; | |
199 | acpi_status status; | |
200 | struct list_head *node, *next; | |
201 | ||
95f8a082 | 202 | if (!ACPI_HANDLE(dev)) |
4e10d12a | 203 | return 0; |
1071695f | 204 | |
95f8a082 | 205 | status = acpi_bus_get_device(ACPI_HANDLE(dev), &acpi_dev); |
1033f904 LT |
206 | if (ACPI_FAILURE(status)) |
207 | goto err; | |
1071695f | 208 | |
1033f904 LT |
209 | mutex_lock(&acpi_dev->physical_node_lock); |
210 | list_for_each_safe(node, next, &acpi_dev->physical_node_list) { | |
211 | char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2]; | |
212 | ||
213 | entry = list_entry(node, struct acpi_device_physical_node, | |
214 | node); | |
215 | if (entry->dev != dev) | |
216 | continue; | |
217 | ||
218 | list_del(node); | |
219 | clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap); | |
1071695f | 220 | |
1033f904 LT |
221 | acpi_dev->physical_node_count--; |
222 | ||
223 | if (!entry->node_id) | |
224 | strcpy(physical_node_name, PHYSICAL_NODE_STRING); | |
225 | else | |
226 | sprintf(physical_node_name, | |
227 | "physical_node%d", entry->node_id); | |
228 | ||
229 | sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name); | |
230 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
95f8a082 | 231 | ACPI_HANDLE_SET(dev, NULL); |
4e10d12a DSL |
232 | /* acpi_bind_one increase refcnt by one */ |
233 | put_device(dev); | |
1033f904 | 234 | kfree(entry); |
4e10d12a | 235 | } |
1033f904 LT |
236 | mutex_unlock(&acpi_dev->physical_node_lock); |
237 | ||
4e10d12a | 238 | return 0; |
1033f904 LT |
239 | |
240 | err: | |
241 | dev_err(dev, "Oops, 'acpi_handle' corrupt\n"); | |
242 | return -EINVAL; | |
4e10d12a | 243 | } |
ac212b69 | 244 | EXPORT_SYMBOL_GPL(acpi_unbind_one); |
4e10d12a DSL |
245 | |
246 | static int acpi_platform_notify(struct device *dev) | |
247 | { | |
53540098 | 248 | struct acpi_bus_type *type = acpi_get_bus_type(dev); |
4e10d12a | 249 | acpi_handle handle; |
11909ca1 | 250 | int ret; |
4e10d12a | 251 | |
f3fd0c8a | 252 | ret = acpi_bind_one(dev, NULL); |
92414481 | 253 | if (ret && type) { |
11909ca1 RW |
254 | ret = type->find_device(dev, &handle); |
255 | if (ret) { | |
256 | DBG("Unable to get handle for %s\n", dev_name(dev)); | |
257 | goto out; | |
258 | } | |
259 | ret = acpi_bind_one(dev, handle); | |
260 | if (ret) | |
261 | goto out; | |
4e10d12a | 262 | } |
11909ca1 RW |
263 | |
264 | if (type && type->setup) | |
265 | type->setup(dev); | |
4e10d12a | 266 | |
f3fd0c8a | 267 | out: |
4e10d12a DSL |
268 | #if ACPI_GLUE_DEBUG |
269 | if (!ret) { | |
270 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
271 | ||
a412a11d | 272 | acpi_get_name(ACPI_HANDLE(dev), ACPI_FULL_PATHNAME, &buffer); |
db1461ad | 273 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 274 | kfree(buffer.pointer); |
4e10d12a | 275 | } else |
db1461ad | 276 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
277 | #endif |
278 | ||
279 | return ret; | |
280 | } | |
281 | ||
282 | static int acpi_platform_notify_remove(struct device *dev) | |
283 | { | |
11909ca1 RW |
284 | struct acpi_bus_type *type; |
285 | ||
53540098 | 286 | type = acpi_get_bus_type(dev); |
11909ca1 RW |
287 | if (type && type->cleanup) |
288 | type->cleanup(dev); | |
289 | ||
4e10d12a DSL |
290 | acpi_unbind_one(dev); |
291 | return 0; | |
292 | } | |
293 | ||
0e46517d | 294 | int __init init_acpi_device_notify(void) |
4e10d12a | 295 | { |
4e10d12a DSL |
296 | if (platform_notify || platform_notify_remove) { |
297 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
298 | return 0; | |
299 | } | |
300 | platform_notify = acpi_platform_notify; | |
301 | platform_notify_remove = acpi_platform_notify_remove; | |
302 | return 0; | |
303 | } |