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 | |
21 | #define DBG(x...) printk(PREFIX x) | |
22 | #else | |
4ebf83c8 | 23 | #define DBG(x...) do { } while(0) |
4e10d12a DSL |
24 | #endif |
25 | static LIST_HEAD(bus_type_list); | |
26 | static DECLARE_RWSEM(bus_type_sem); | |
27 | ||
1033f904 LT |
28 | #define PHYSICAL_NODE_STRING "physical_node" |
29 | ||
4e10d12a DSL |
30 | int register_acpi_bus_type(struct acpi_bus_type *type) |
31 | { | |
32 | if (acpi_disabled) | |
33 | return -ENODEV; | |
34 | if (type && type->bus && type->find_device) { | |
35 | down_write(&bus_type_sem); | |
36 | list_add_tail(&type->list, &bus_type_list); | |
37 | up_write(&bus_type_sem); | |
4be44fcd LB |
38 | printk(KERN_INFO PREFIX "bus type %s registered\n", |
39 | type->bus->name); | |
4e10d12a DSL |
40 | return 0; |
41 | } | |
42 | return -ENODEV; | |
43 | } | |
91e4d5a1 | 44 | EXPORT_SYMBOL_GPL(register_acpi_bus_type); |
4e10d12a | 45 | |
4e10d12a DSL |
46 | int unregister_acpi_bus_type(struct acpi_bus_type *type) |
47 | { | |
48 | if (acpi_disabled) | |
49 | return 0; | |
50 | if (type) { | |
51 | down_write(&bus_type_sem); | |
52 | list_del_init(&type->list); | |
53 | up_write(&bus_type_sem); | |
4be44fcd LB |
54 | printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n", |
55 | type->bus->name); | |
4e10d12a DSL |
56 | return 0; |
57 | } | |
58 | return -ENODEV; | |
59 | } | |
91e4d5a1 | 60 | EXPORT_SYMBOL_GPL(unregister_acpi_bus_type); |
4e10d12a | 61 | |
4e10d12a DSL |
62 | static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type) |
63 | { | |
64 | struct acpi_bus_type *tmp, *ret = NULL; | |
65 | ||
66 | down_read(&bus_type_sem); | |
67 | list_for_each_entry(tmp, &bus_type_list, list) { | |
68 | if (tmp->bus == type) { | |
69 | ret = tmp; | |
70 | break; | |
71 | } | |
72 | } | |
73 | up_read(&bus_type_sem); | |
74 | return ret; | |
75 | } | |
76 | ||
77 | static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle) | |
78 | { | |
79 | struct acpi_bus_type *tmp; | |
80 | int ret = -ENODEV; | |
81 | ||
82 | down_read(&bus_type_sem); | |
83 | list_for_each_entry(tmp, &bus_type_list, list) { | |
84 | if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) { | |
85 | ret = 0; | |
86 | break; | |
87 | } | |
88 | } | |
89 | up_read(&bus_type_sem); | |
90 | return ret; | |
91 | } | |
92 | ||
4e10d12a DSL |
93 | /* Get device's handler per its address under its parent */ |
94 | struct acpi_find_child { | |
95 | acpi_handle handle; | |
439913ff | 96 | u64 address; |
4e10d12a DSL |
97 | }; |
98 | ||
99 | static acpi_status | |
100 | do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv) | |
101 | { | |
102 | acpi_status status; | |
103 | struct acpi_device_info *info; | |
50dd0969 | 104 | struct acpi_find_child *find = context; |
4e10d12a | 105 | |
15b8dd53 | 106 | status = acpi_get_object_info(handle, &info); |
4e10d12a | 107 | if (ACPI_SUCCESS(status)) { |
108029ff ZY |
108 | if ((info->address == find->address) |
109 | && (info->valid & ACPI_VALID_ADR)) | |
4e10d12a | 110 | find->handle = handle; |
15b8dd53 | 111 | kfree(info); |
4e10d12a DSL |
112 | } |
113 | return AE_OK; | |
114 | } | |
115 | ||
439913ff | 116 | acpi_handle acpi_get_child(acpi_handle parent, u64 address) |
4e10d12a DSL |
117 | { |
118 | struct acpi_find_child find = { NULL, address }; | |
119 | ||
120 | if (!parent) | |
121 | return NULL; | |
122 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, | |
2263576c | 123 | 1, do_acpi_find_child, NULL, &find, NULL); |
4e10d12a DSL |
124 | return find.handle; |
125 | } | |
126 | ||
127 | EXPORT_SYMBOL(acpi_get_child); | |
128 | ||
4e10d12a DSL |
129 | static int acpi_bind_one(struct device *dev, acpi_handle handle) |
130 | { | |
1071695f | 131 | struct acpi_device *acpi_dev; |
4e10d12a | 132 | acpi_status status; |
f3fd0c8a | 133 | struct acpi_device_physical_node *physical_node, *pn; |
1033f904 LT |
134 | char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2]; |
135 | int retval = -EINVAL; | |
4e10d12a | 136 | |
06f64c8f | 137 | if (dev->acpi_handle) { |
f3fd0c8a RW |
138 | if (handle) { |
139 | dev_warn(dev, "ACPI handle is already set\n"); | |
140 | return -EINVAL; | |
141 | } else { | |
142 | handle = dev->acpi_handle; | |
143 | } | |
4e10d12a | 144 | } |
f3fd0c8a RW |
145 | if (!handle) |
146 | return -EINVAL; | |
1033f904 | 147 | |
4e10d12a | 148 | get_device(dev); |
1033f904 LT |
149 | status = acpi_bus_get_device(handle, &acpi_dev); |
150 | if (ACPI_FAILURE(status)) | |
151 | goto err; | |
152 | ||
f3fd0c8a | 153 | physical_node = kzalloc(sizeof(*physical_node), GFP_KERNEL); |
1033f904 LT |
154 | if (!physical_node) { |
155 | retval = -ENOMEM; | |
156 | goto err; | |
4e10d12a | 157 | } |
4e10d12a | 158 | |
1033f904 | 159 | mutex_lock(&acpi_dev->physical_node_lock); |
f3fd0c8a RW |
160 | |
161 | /* Sanity check. */ | |
162 | list_for_each_entry(pn, &acpi_dev->physical_node_list, node) | |
163 | if (pn->dev == dev) { | |
164 | dev_warn(dev, "Already associated with ACPI node\n"); | |
165 | goto err_free; | |
166 | } | |
167 | ||
1033f904 LT |
168 | /* allocate physical node id according to physical_node_id_bitmap */ |
169 | physical_node->node_id = | |
170 | find_first_zero_bit(acpi_dev->physical_node_id_bitmap, | |
171 | ACPI_MAX_PHYSICAL_NODE); | |
172 | if (physical_node->node_id >= ACPI_MAX_PHYSICAL_NODE) { | |
173 | retval = -ENOSPC; | |
f3fd0c8a | 174 | goto err_free; |
1071695f DB |
175 | } |
176 | ||
1033f904 LT |
177 | set_bit(physical_node->node_id, acpi_dev->physical_node_id_bitmap); |
178 | physical_node->dev = dev; | |
179 | list_add_tail(&physical_node->node, &acpi_dev->physical_node_list); | |
180 | acpi_dev->physical_node_count++; | |
f3fd0c8a | 181 | |
1033f904 LT |
182 | mutex_unlock(&acpi_dev->physical_node_lock); |
183 | ||
f3fd0c8a RW |
184 | if (!dev->acpi_handle) |
185 | dev->acpi_handle = handle; | |
1033f904 LT |
186 | |
187 | if (!physical_node->node_id) | |
188 | strcpy(physical_node_name, PHYSICAL_NODE_STRING); | |
189 | else | |
190 | sprintf(physical_node_name, | |
191 | "physical_node%d", physical_node->node_id); | |
192 | retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, | |
193 | physical_node_name); | |
194 | retval = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj, | |
195 | "firmware_node"); | |
196 | ||
197 | if (acpi_dev->wakeup.flags.valid) | |
198 | device_set_wakeup_capable(dev, true); | |
199 | ||
4e10d12a | 200 | return 0; |
1033f904 LT |
201 | |
202 | err: | |
f3fd0c8a | 203 | dev->acpi_handle = NULL; |
1033f904 LT |
204 | put_device(dev); |
205 | return retval; | |
f3fd0c8a RW |
206 | |
207 | err_free: | |
208 | mutex_unlock(&acpi_dev->physical_node_lock); | |
209 | kfree(physical_node); | |
210 | goto err; | |
4e10d12a DSL |
211 | } |
212 | ||
213 | static int acpi_unbind_one(struct device *dev) | |
214 | { | |
1033f904 LT |
215 | struct acpi_device_physical_node *entry; |
216 | struct acpi_device *acpi_dev; | |
217 | acpi_status status; | |
218 | struct list_head *node, *next; | |
219 | ||
06f64c8f | 220 | if (!dev->acpi_handle) |
4e10d12a | 221 | return 0; |
1071695f | 222 | |
06f64c8f | 223 | status = acpi_bus_get_device(dev->acpi_handle, &acpi_dev); |
1033f904 LT |
224 | if (ACPI_FAILURE(status)) |
225 | goto err; | |
1071695f | 226 | |
1033f904 LT |
227 | mutex_lock(&acpi_dev->physical_node_lock); |
228 | list_for_each_safe(node, next, &acpi_dev->physical_node_list) { | |
229 | char physical_node_name[sizeof(PHYSICAL_NODE_STRING) + 2]; | |
230 | ||
231 | entry = list_entry(node, struct acpi_device_physical_node, | |
232 | node); | |
233 | if (entry->dev != dev) | |
234 | continue; | |
235 | ||
236 | list_del(node); | |
237 | clear_bit(entry->node_id, acpi_dev->physical_node_id_bitmap); | |
1071695f | 238 | |
1033f904 LT |
239 | acpi_dev->physical_node_count--; |
240 | ||
241 | if (!entry->node_id) | |
242 | strcpy(physical_node_name, PHYSICAL_NODE_STRING); | |
243 | else | |
244 | sprintf(physical_node_name, | |
245 | "physical_node%d", entry->node_id); | |
246 | ||
247 | sysfs_remove_link(&acpi_dev->dev.kobj, physical_node_name); | |
248 | sysfs_remove_link(&dev->kobj, "firmware_node"); | |
06f64c8f | 249 | dev->acpi_handle = NULL; |
4e10d12a DSL |
250 | /* acpi_bind_one increase refcnt by one */ |
251 | put_device(dev); | |
1033f904 | 252 | kfree(entry); |
4e10d12a | 253 | } |
1033f904 LT |
254 | mutex_unlock(&acpi_dev->physical_node_lock); |
255 | ||
4e10d12a | 256 | return 0; |
1033f904 LT |
257 | |
258 | err: | |
259 | dev_err(dev, "Oops, 'acpi_handle' corrupt\n"); | |
260 | return -EINVAL; | |
4e10d12a DSL |
261 | } |
262 | ||
263 | static int acpi_platform_notify(struct device *dev) | |
264 | { | |
265 | struct acpi_bus_type *type; | |
266 | acpi_handle handle; | |
267 | int ret = -EINVAL; | |
268 | ||
f3fd0c8a RW |
269 | ret = acpi_bind_one(dev, NULL); |
270 | if (!ret) | |
271 | goto out; | |
272 | ||
4e10d12a DSL |
273 | if (!dev->bus || !dev->parent) { |
274 | /* bridge devices genernally haven't bus or parent */ | |
275 | ret = acpi_find_bridge_device(dev, &handle); | |
276 | goto end; | |
277 | } | |
278 | type = acpi_get_bus_type(dev->bus); | |
279 | if (!type) { | |
db1461ad | 280 | DBG("No ACPI bus support for %s\n", dev_name(dev)); |
4e10d12a DSL |
281 | ret = -EINVAL; |
282 | goto end; | |
283 | } | |
284 | if ((ret = type->find_device(dev, &handle)) != 0) | |
db1461ad | 285 | DBG("Can't get handler for %s\n", dev_name(dev)); |
f3fd0c8a | 286 | end: |
4e10d12a DSL |
287 | if (!ret) |
288 | acpi_bind_one(dev, handle); | |
289 | ||
f3fd0c8a | 290 | out: |
4e10d12a DSL |
291 | #if ACPI_GLUE_DEBUG |
292 | if (!ret) { | |
293 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
294 | ||
06f64c8f | 295 | acpi_get_name(dev->acpi_handle, ACPI_FULL_PATHNAME, &buffer); |
db1461ad | 296 | DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer); |
02438d87 | 297 | kfree(buffer.pointer); |
4e10d12a | 298 | } else |
db1461ad | 299 | DBG("Device %s -> No ACPI support\n", dev_name(dev)); |
4e10d12a DSL |
300 | #endif |
301 | ||
302 | return ret; | |
303 | } | |
304 | ||
305 | static int acpi_platform_notify_remove(struct device *dev) | |
306 | { | |
307 | acpi_unbind_one(dev); | |
308 | return 0; | |
309 | } | |
310 | ||
0e46517d | 311 | int __init init_acpi_device_notify(void) |
4e10d12a | 312 | { |
4e10d12a DSL |
313 | if (platform_notify || platform_notify_remove) { |
314 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
315 | return 0; | |
316 | } | |
317 | platform_notify = acpi_platform_notify; | |
318 | platform_notify_remove = acpi_platform_notify_remove; | |
319 | return 0; | |
320 | } |