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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 | */ | |
9 | #include <linux/init.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/rwsem.h> | |
13 | #include <linux/acpi.h> | |
14 | ||
15 | #define ACPI_GLUE_DEBUG 0 | |
16 | #if ACPI_GLUE_DEBUG | |
17 | #define DBG(x...) printk(PREFIX x) | |
18 | #else | |
4ebf83c8 | 19 | #define DBG(x...) do { } while(0) |
4e10d12a DSL |
20 | #endif |
21 | static LIST_HEAD(bus_type_list); | |
22 | static DECLARE_RWSEM(bus_type_sem); | |
23 | ||
24 | int register_acpi_bus_type(struct acpi_bus_type *type) | |
25 | { | |
26 | if (acpi_disabled) | |
27 | return -ENODEV; | |
28 | if (type && type->bus && type->find_device) { | |
29 | down_write(&bus_type_sem); | |
30 | list_add_tail(&type->list, &bus_type_list); | |
31 | up_write(&bus_type_sem); | |
4be44fcd LB |
32 | printk(KERN_INFO PREFIX "bus type %s registered\n", |
33 | type->bus->name); | |
4e10d12a DSL |
34 | return 0; |
35 | } | |
36 | return -ENODEV; | |
37 | } | |
38 | ||
39 | EXPORT_SYMBOL(register_acpi_bus_type); | |
40 | ||
41 | int unregister_acpi_bus_type(struct acpi_bus_type *type) | |
42 | { | |
43 | if (acpi_disabled) | |
44 | return 0; | |
45 | if (type) { | |
46 | down_write(&bus_type_sem); | |
47 | list_del_init(&type->list); | |
48 | up_write(&bus_type_sem); | |
4be44fcd LB |
49 | printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n", |
50 | type->bus->name); | |
4e10d12a DSL |
51 | return 0; |
52 | } | |
53 | return -ENODEV; | |
54 | } | |
55 | ||
56 | EXPORT_SYMBOL(unregister_acpi_bus_type); | |
57 | ||
58 | static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type) | |
59 | { | |
60 | struct acpi_bus_type *tmp, *ret = NULL; | |
61 | ||
62 | down_read(&bus_type_sem); | |
63 | list_for_each_entry(tmp, &bus_type_list, list) { | |
64 | if (tmp->bus == type) { | |
65 | ret = tmp; | |
66 | break; | |
67 | } | |
68 | } | |
69 | up_read(&bus_type_sem); | |
70 | return ret; | |
71 | } | |
72 | ||
73 | static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle) | |
74 | { | |
75 | struct acpi_bus_type *tmp; | |
76 | int ret = -ENODEV; | |
77 | ||
78 | down_read(&bus_type_sem); | |
79 | list_for_each_entry(tmp, &bus_type_list, list) { | |
80 | if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) { | |
81 | ret = 0; | |
82 | break; | |
83 | } | |
84 | } | |
85 | up_read(&bus_type_sem); | |
86 | return ret; | |
87 | } | |
88 | ||
4e10d12a DSL |
89 | /* Get device's handler per its address under its parent */ |
90 | struct acpi_find_child { | |
91 | acpi_handle handle; | |
92 | acpi_integer address; | |
93 | }; | |
94 | ||
95 | static acpi_status | |
96 | do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv) | |
97 | { | |
98 | acpi_status status; | |
99 | struct acpi_device_info *info; | |
100 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
50dd0969 | 101 | struct acpi_find_child *find = context; |
4e10d12a DSL |
102 | |
103 | status = acpi_get_object_info(handle, &buffer); | |
104 | if (ACPI_SUCCESS(status)) { | |
105 | info = buffer.pointer; | |
106 | if (info->address == find->address) | |
107 | find->handle = handle; | |
02438d87 | 108 | kfree(buffer.pointer); |
4e10d12a DSL |
109 | } |
110 | return AE_OK; | |
111 | } | |
112 | ||
113 | acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address) | |
114 | { | |
115 | struct acpi_find_child find = { NULL, address }; | |
116 | ||
117 | if (!parent) | |
118 | return NULL; | |
119 | acpi_walk_namespace(ACPI_TYPE_DEVICE, parent, | |
120 | 1, do_acpi_find_child, &find, NULL); | |
121 | return find.handle; | |
122 | } | |
123 | ||
124 | EXPORT_SYMBOL(acpi_get_child); | |
125 | ||
126 | /* Link ACPI devices with physical devices */ | |
127 | static void acpi_glue_data_handler(acpi_handle handle, | |
128 | u32 function, void *context) | |
129 | { | |
130 | /* we provide an empty handler */ | |
131 | } | |
132 | ||
133 | /* Note: a success call will increase reference count by one */ | |
134 | struct device *acpi_get_physical_device(acpi_handle handle) | |
135 | { | |
136 | acpi_status status; | |
137 | struct device *dev; | |
138 | ||
139 | status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev); | |
140 | if (ACPI_SUCCESS(status)) | |
141 | return get_device(dev); | |
142 | return NULL; | |
143 | } | |
144 | ||
145 | EXPORT_SYMBOL(acpi_get_physical_device); | |
146 | ||
147 | static int acpi_bind_one(struct device *dev, acpi_handle handle) | |
148 | { | |
149 | acpi_status status; | |
150 | ||
465ae641 | 151 | if (dev->archdata.acpi_handle) { |
4e10d12a | 152 | printk(KERN_WARNING PREFIX |
465ae641 | 153 | "Drivers changed 'acpi_handle' for %s\n", dev->bus_id); |
4e10d12a DSL |
154 | return -EINVAL; |
155 | } | |
156 | get_device(dev); | |
157 | status = acpi_attach_data(handle, acpi_glue_data_handler, dev); | |
158 | if (ACPI_FAILURE(status)) { | |
159 | put_device(dev); | |
160 | return -EINVAL; | |
161 | } | |
465ae641 | 162 | dev->archdata.acpi_handle = handle; |
4e10d12a DSL |
163 | |
164 | return 0; | |
165 | } | |
166 | ||
167 | static int acpi_unbind_one(struct device *dev) | |
168 | { | |
465ae641 | 169 | if (!dev->archdata.acpi_handle) |
4e10d12a | 170 | return 0; |
465ae641 | 171 | if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) { |
4e10d12a DSL |
172 | /* acpi_get_physical_device increase refcnt by one */ |
173 | put_device(dev); | |
465ae641 BH |
174 | acpi_detach_data(dev->archdata.acpi_handle, |
175 | acpi_glue_data_handler); | |
176 | dev->archdata.acpi_handle = NULL; | |
4e10d12a DSL |
177 | /* acpi_bind_one increase refcnt by one */ |
178 | put_device(dev); | |
179 | } else { | |
180 | printk(KERN_ERR PREFIX | |
465ae641 | 181 | "Oops, 'acpi_handle' corrupt for %s\n", dev->bus_id); |
4e10d12a DSL |
182 | } |
183 | return 0; | |
184 | } | |
185 | ||
186 | static int acpi_platform_notify(struct device *dev) | |
187 | { | |
188 | struct acpi_bus_type *type; | |
189 | acpi_handle handle; | |
190 | int ret = -EINVAL; | |
191 | ||
192 | if (!dev->bus || !dev->parent) { | |
193 | /* bridge devices genernally haven't bus or parent */ | |
194 | ret = acpi_find_bridge_device(dev, &handle); | |
195 | goto end; | |
196 | } | |
197 | type = acpi_get_bus_type(dev->bus); | |
198 | if (!type) { | |
ef7b06cd | 199 | DBG("No ACPI bus support for %s\n", dev->bus_id); |
4e10d12a DSL |
200 | ret = -EINVAL; |
201 | goto end; | |
202 | } | |
203 | if ((ret = type->find_device(dev, &handle)) != 0) | |
ef7b06cd | 204 | DBG("Can't get handler for %s\n", dev->bus_id); |
4e10d12a DSL |
205 | end: |
206 | if (!ret) | |
207 | acpi_bind_one(dev, handle); | |
208 | ||
209 | #if ACPI_GLUE_DEBUG | |
210 | if (!ret) { | |
211 | struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; | |
212 | ||
465ae641 BH |
213 | acpi_get_name(dev->archdata.acpi_handle, |
214 | ACPI_FULL_PATHNAME, &buffer); | |
4e10d12a | 215 | DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer); |
02438d87 | 216 | kfree(buffer.pointer); |
4e10d12a DSL |
217 | } else |
218 | DBG("Device %s -> No ACPI support\n", dev->bus_id); | |
219 | #endif | |
220 | ||
221 | return ret; | |
222 | } | |
223 | ||
224 | static int acpi_platform_notify_remove(struct device *dev) | |
225 | { | |
226 | acpi_unbind_one(dev); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | static int __init init_acpi_device_notify(void) | |
231 | { | |
232 | if (acpi_disabled) | |
233 | return 0; | |
234 | if (platform_notify || platform_notify_remove) { | |
235 | printk(KERN_ERR PREFIX "Can't use platform_notify\n"); | |
236 | return 0; | |
237 | } | |
238 | platform_notify = acpi_platform_notify; | |
239 | platform_notify_remove = acpi_platform_notify_remove; | |
240 | return 0; | |
241 | } | |
242 | ||
243 | arch_initcall(init_acpi_device_notify); | |
a74388e2 DB |
244 | |
245 | ||
246 | #if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE) | |
247 | ||
f5f72b46 DB |
248 | #ifdef CONFIG_PM |
249 | static u32 rtc_handler(void *context) | |
250 | { | |
251 | acpi_clear_event(ACPI_EVENT_RTC); | |
252 | acpi_disable_event(ACPI_EVENT_RTC, 0); | |
253 | return ACPI_INTERRUPT_HANDLED; | |
254 | } | |
255 | ||
256 | static inline void rtc_wake_setup(void) | |
257 | { | |
258 | acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL); | |
259 | } | |
260 | ||
261 | static void rtc_wake_on(struct device *dev) | |
262 | { | |
263 | acpi_clear_event(ACPI_EVENT_RTC); | |
264 | acpi_enable_event(ACPI_EVENT_RTC, 0); | |
265 | } | |
266 | ||
267 | static void rtc_wake_off(struct device *dev) | |
268 | { | |
269 | acpi_disable_event(ACPI_EVENT_RTC, 0); | |
270 | } | |
271 | #else | |
272 | #define rtc_wake_setup() do{}while(0) | |
273 | #define rtc_wake_on NULL | |
274 | #define rtc_wake_off NULL | |
275 | #endif | |
276 | ||
a74388e2 DB |
277 | /* Every ACPI platform has a mc146818 compatible "cmos rtc". Here we find |
278 | * its device node and pass extra config data. This helps its driver use | |
279 | * capabilities that the now-obsolete mc146818 didn't have, and informs it | |
280 | * that this board's RTC is wakeup-capable (per ACPI spec). | |
281 | */ | |
282 | #include <linux/mc146818rtc.h> | |
283 | ||
284 | static struct cmos_rtc_board_info rtc_info; | |
285 | ||
286 | ||
a74388e2 DB |
287 | /* PNP devices are registered in a subsys_initcall(); |
288 | * ACPI specifies the PNP IDs to use. | |
289 | */ | |
290 | #include <linux/pnp.h> | |
291 | ||
292 | static int __init pnp_match(struct device *dev, void *data) | |
293 | { | |
294 | static const char *ids[] = { "PNP0b00", "PNP0b01", "PNP0b02", }; | |
295 | struct pnp_dev *pnp = to_pnp_dev(dev); | |
296 | int i; | |
297 | ||
298 | for (i = 0; i < ARRAY_SIZE(ids); i++) { | |
299 | if (compare_pnp_id(pnp->id, ids[i]) != 0) | |
300 | return 1; | |
301 | } | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static struct device *__init get_rtc_dev(void) | |
306 | { | |
307 | return bus_find_device(&pnp_bus_type, NULL, NULL, pnp_match); | |
308 | } | |
309 | ||
a74388e2 DB |
310 | static int __init acpi_rtc_init(void) |
311 | { | |
312 | struct device *dev = get_rtc_dev(); | |
313 | ||
314 | if (dev) { | |
f5f72b46 DB |
315 | rtc_wake_setup(); |
316 | rtc_info.wake_on = rtc_wake_on; | |
317 | rtc_info.wake_off = rtc_wake_off; | |
318 | ||
19bfe37c DB |
319 | /* workaround bug in some ACPI tables */ |
320 | if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) { | |
321 | DBG("bogus FADT month_alarm\n"); | |
322 | acpi_gbl_FADT.month_alarm = 0; | |
323 | } | |
324 | ||
a74388e2 DB |
325 | rtc_info.rtc_day_alarm = acpi_gbl_FADT.day_alarm; |
326 | rtc_info.rtc_mon_alarm = acpi_gbl_FADT.month_alarm; | |
327 | rtc_info.rtc_century = acpi_gbl_FADT.century; | |
328 | ||
f5f72b46 DB |
329 | /* NOTE: S4_RTC_WAKE is NOT currently useful to Linux */ |
330 | if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE) | |
19bfe37c DB |
331 | printk(PREFIX "RTC can wake from S4\n"); |
332 | ||
a74388e2 DB |
333 | |
334 | dev->platform_data = &rtc_info; | |
335 | ||
336 | /* RTC always wakes from S1/S2/S3, and often S4/STD */ | |
337 | device_init_wakeup(dev, 1); | |
338 | ||
339 | put_device(dev); | |
340 | } else | |
19bfe37c | 341 | DBG("RTC unavailable?\n"); |
a74388e2 DB |
342 | return 0; |
343 | } | |
344 | /* do this between RTC subsys_initcall() and rtc_cmos driver_initcall() */ | |
345 | fs_initcall(acpi_rtc_init); | |
346 | ||
347 | #endif |