blob: 5479b9f42513a17d7ab27aa8ed48d3035d547651 [file] [log] [blame]
David Shaohua Li4e10d122005-03-18 18:45:35 -05001/*
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
Dave Jones4ebf83c2007-07-09 11:33:14 -070019#define DBG(x...) do { } while(0)
David Shaohua Li4e10d122005-03-18 18:45:35 -050020#endif
21static LIST_HEAD(bus_type_list);
22static DECLARE_RWSEM(bus_type_sem);
23
24int 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);
Len Brown4be44fc2005-08-05 00:44:28 -040032 printk(KERN_INFO PREFIX "bus type %s registered\n",
33 type->bus->name);
David Shaohua Li4e10d122005-03-18 18:45:35 -050034 return 0;
35 }
36 return -ENODEV;
37}
38
David Shaohua Li4e10d122005-03-18 18:45:35 -050039int unregister_acpi_bus_type(struct acpi_bus_type *type)
40{
41 if (acpi_disabled)
42 return 0;
43 if (type) {
44 down_write(&bus_type_sem);
45 list_del_init(&type->list);
46 up_write(&bus_type_sem);
Len Brown4be44fc2005-08-05 00:44:28 -040047 printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
48 type->bus->name);
David Shaohua Li4e10d122005-03-18 18:45:35 -050049 return 0;
50 }
51 return -ENODEV;
52}
53
David Shaohua Li4e10d122005-03-18 18:45:35 -050054static struct acpi_bus_type *acpi_get_bus_type(struct bus_type *type)
55{
56 struct acpi_bus_type *tmp, *ret = NULL;
57
58 down_read(&bus_type_sem);
59 list_for_each_entry(tmp, &bus_type_list, list) {
60 if (tmp->bus == type) {
61 ret = tmp;
62 break;
63 }
64 }
65 up_read(&bus_type_sem);
66 return ret;
67}
68
69static int acpi_find_bridge_device(struct device *dev, acpi_handle * handle)
70{
71 struct acpi_bus_type *tmp;
72 int ret = -ENODEV;
73
74 down_read(&bus_type_sem);
75 list_for_each_entry(tmp, &bus_type_list, list) {
76 if (tmp->find_bridge && !tmp->find_bridge(dev, handle)) {
77 ret = 0;
78 break;
79 }
80 }
81 up_read(&bus_type_sem);
82 return ret;
83}
84
David Shaohua Li4e10d122005-03-18 18:45:35 -050085/* Get device's handler per its address under its parent */
86struct acpi_find_child {
87 acpi_handle handle;
88 acpi_integer address;
89};
90
91static acpi_status
92do_acpi_find_child(acpi_handle handle, u32 lvl, void *context, void **rv)
93{
94 acpi_status status;
95 struct acpi_device_info *info;
96 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
Jan Engelhardt50dd0962006-10-01 00:28:50 +020097 struct acpi_find_child *find = context;
David Shaohua Li4e10d122005-03-18 18:45:35 -050098
99 status = acpi_get_object_info(handle, &buffer);
100 if (ACPI_SUCCESS(status)) {
101 info = buffer.pointer;
102 if (info->address == find->address)
103 find->handle = handle;
Len Brown02438d82006-06-30 03:19:10 -0400104 kfree(buffer.pointer);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500105 }
106 return AE_OK;
107}
108
109acpi_handle acpi_get_child(acpi_handle parent, acpi_integer address)
110{
111 struct acpi_find_child find = { NULL, address };
112
113 if (!parent)
114 return NULL;
115 acpi_walk_namespace(ACPI_TYPE_DEVICE, parent,
116 1, do_acpi_find_child, &find, NULL);
117 return find.handle;
118}
119
120EXPORT_SYMBOL(acpi_get_child);
121
122/* Link ACPI devices with physical devices */
123static void acpi_glue_data_handler(acpi_handle handle,
124 u32 function, void *context)
125{
126 /* we provide an empty handler */
127}
128
129/* Note: a success call will increase reference count by one */
130struct device *acpi_get_physical_device(acpi_handle handle)
131{
132 acpi_status status;
133 struct device *dev;
134
135 status = acpi_get_data(handle, acpi_glue_data_handler, (void **)&dev);
136 if (ACPI_SUCCESS(status))
137 return get_device(dev);
138 return NULL;
139}
140
141EXPORT_SYMBOL(acpi_get_physical_device);
142
Thomas Renninger22c13f92008-08-01 17:37:54 +0200143/* ToDo: When a PCI bridge is found, return the PCI device behind the bridge
144 * This should work in general, but did not on a Lenovo T61 for the
145 * graphics card. But this must be fixed when the PCI device is
146 * bound and the kernel device struct is attached to the acpi device
147 * Note: A success call will increase reference count by one
148 * Do call put_device(dev) on the returned device then
149 */
150struct device *acpi_get_physical_pci_device(acpi_handle handle)
151{
152 struct device *dev;
153 long long device_id;
154 acpi_status status;
155
156 status =
157 acpi_evaluate_integer(handle, "_ADR", NULL, &device_id);
158
159 if (ACPI_FAILURE(status))
160 return NULL;
161
162 /* We need to attempt to determine whether the _ADR refers to a
163 PCI device or not. There's no terribly good way to do this,
164 so the best we can hope for is to assume that there'll never
165 be a device in the host bridge */
166 if (device_id >= 0x10000) {
167 /* It looks like a PCI device. Does it exist? */
168 dev = acpi_get_physical_device(handle);
169 } else {
170 /* It doesn't look like a PCI device. Does its parent
171 exist? */
172 acpi_handle phandle;
173 if (acpi_get_parent(handle, &phandle))
174 return NULL;
175 dev = acpi_get_physical_device(phandle);
176 }
177 if (!dev)
178 return NULL;
179 return dev;
180}
181EXPORT_SYMBOL(acpi_get_physical_pci_device);
182
David Shaohua Li4e10d122005-03-18 18:45:35 -0500183static int acpi_bind_one(struct device *dev, acpi_handle handle)
184{
David Brownell10716952008-02-22 21:54:24 -0800185 struct acpi_device *acpi_dev;
David Shaohua Li4e10d122005-03-18 18:45:35 -0500186 acpi_status status;
187
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100188 if (dev->archdata.acpi_handle) {
Greg Kroah-Hartmanfc3a8822008-05-02 06:02:41 +0200189 dev_warn(dev, "Drivers changed 'acpi_handle'\n");
David Shaohua Li4e10d122005-03-18 18:45:35 -0500190 return -EINVAL;
191 }
192 get_device(dev);
193 status = acpi_attach_data(handle, acpi_glue_data_handler, dev);
194 if (ACPI_FAILURE(status)) {
195 put_device(dev);
196 return -EINVAL;
197 }
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100198 dev->archdata.acpi_handle = handle;
David Shaohua Li4e10d122005-03-18 18:45:35 -0500199
David Brownell10716952008-02-22 21:54:24 -0800200 status = acpi_bus_get_device(handle, &acpi_dev);
201 if (!ACPI_FAILURE(status)) {
202 int ret;
203
204 ret = sysfs_create_link(&dev->kobj, &acpi_dev->dev.kobj,
205 "firmware_node");
206 ret = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj,
207 "physical_node");
Rafael J. Wysocki76acae02008-10-03 15:23:49 -0700208 if (acpi_dev->wakeup.flags.valid) {
Rafael J. Wysockieb9d0fe2008-07-07 03:34:48 +0200209 device_set_wakeup_capable(dev, true);
Rafael J. Wysocki76acae02008-10-03 15:23:49 -0700210 device_set_wakeup_enable(dev,
211 acpi_dev->wakeup.state.enabled);
212 }
David Brownell10716952008-02-22 21:54:24 -0800213 }
214
David Shaohua Li4e10d122005-03-18 18:45:35 -0500215 return 0;
216}
217
218static int acpi_unbind_one(struct device *dev)
219{
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100220 if (!dev->archdata.acpi_handle)
David Shaohua Li4e10d122005-03-18 18:45:35 -0500221 return 0;
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100222 if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
David Brownell10716952008-02-22 21:54:24 -0800223 struct acpi_device *acpi_dev;
224
David Shaohua Li4e10d122005-03-18 18:45:35 -0500225 /* acpi_get_physical_device increase refcnt by one */
226 put_device(dev);
David Brownell10716952008-02-22 21:54:24 -0800227
228 if (!acpi_bus_get_device(dev->archdata.acpi_handle,
229 &acpi_dev)) {
230 sysfs_remove_link(&dev->kobj, "firmware_node");
231 sysfs_remove_link(&acpi_dev->dev.kobj, "physical_node");
232 }
233
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100234 acpi_detach_data(dev->archdata.acpi_handle,
235 acpi_glue_data_handler);
236 dev->archdata.acpi_handle = NULL;
David Shaohua Li4e10d122005-03-18 18:45:35 -0500237 /* acpi_bind_one increase refcnt by one */
238 put_device(dev);
239 } else {
Greg Kroah-Hartmanfc3a8822008-05-02 06:02:41 +0200240 dev_err(dev, "Oops, 'acpi_handle' corrupt\n");
David Shaohua Li4e10d122005-03-18 18:45:35 -0500241 }
242 return 0;
243}
244
245static int acpi_platform_notify(struct device *dev)
246{
247 struct acpi_bus_type *type;
248 acpi_handle handle;
249 int ret = -EINVAL;
250
251 if (!dev->bus || !dev->parent) {
252 /* bridge devices genernally haven't bus or parent */
253 ret = acpi_find_bridge_device(dev, &handle);
254 goto end;
255 }
256 type = acpi_get_bus_type(dev->bus);
257 if (!type) {
Kay Sieversdb1461a2009-01-25 23:40:56 +0100258 DBG("No ACPI bus support for %s\n", dev_name(dev));
David Shaohua Li4e10d122005-03-18 18:45:35 -0500259 ret = -EINVAL;
260 goto end;
261 }
262 if ((ret = type->find_device(dev, &handle)) != 0)
Kay Sieversdb1461a2009-01-25 23:40:56 +0100263 DBG("Can't get handler for %s\n", dev_name(dev));
David Shaohua Li4e10d122005-03-18 18:45:35 -0500264 end:
265 if (!ret)
266 acpi_bind_one(dev, handle);
267
268#if ACPI_GLUE_DEBUG
269 if (!ret) {
270 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
271
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100272 acpi_get_name(dev->archdata.acpi_handle,
273 ACPI_FULL_PATHNAME, &buffer);
Kay Sieversdb1461a2009-01-25 23:40:56 +0100274 DBG("Device %s -> %s\n", dev_name(dev), (char *)buffer.pointer);
Len Brown02438d82006-06-30 03:19:10 -0400275 kfree(buffer.pointer);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500276 } else
Kay Sieversdb1461a2009-01-25 23:40:56 +0100277 DBG("Device %s -> No ACPI support\n", dev_name(dev));
David Shaohua Li4e10d122005-03-18 18:45:35 -0500278#endif
279
280 return ret;
281}
282
283static int acpi_platform_notify_remove(struct device *dev)
284{
285 acpi_unbind_one(dev);
286 return 0;
287}
288
289static int __init init_acpi_device_notify(void)
290{
291 if (acpi_disabled)
292 return 0;
293 if (platform_notify || platform_notify_remove) {
294 printk(KERN_ERR PREFIX "Can't use platform_notify\n");
295 return 0;
296 }
297 platform_notify = acpi_platform_notify;
298 platform_notify_remove = acpi_platform_notify_remove;
299 return 0;
300}
301
302arch_initcall(init_acpi_device_notify);