blob: 41427a41f6201fbcad4c8b7bcbaaa62228e21ed3 [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
19#define DBG(x...)
20#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
39EXPORT_SYMBOL(register_acpi_bus_type);
40
41int 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);
Len Brown4be44fc2005-08-05 00:44:28 -040049 printk(KERN_INFO PREFIX "ACPI bus type %s unregistered\n",
50 type->bus->name);
David Shaohua Li4e10d122005-03-18 18:45:35 -050051 return 0;
52 }
53 return -ENODEV;
54}
55
56EXPORT_SYMBOL(unregister_acpi_bus_type);
57
58static 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
73static 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
David Shaohua Li4e10d122005-03-18 18:45:35 -050089/* Get device's handler per its address under its parent */
90struct acpi_find_child {
91 acpi_handle handle;
92 acpi_integer address;
93};
94
95static acpi_status
96do_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 };
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200101 struct acpi_find_child *find = context;
David Shaohua Li4e10d122005-03-18 18:45:35 -0500102
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;
Len Brown02438d82006-06-30 03:19:10 -0400108 kfree(buffer.pointer);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500109 }
110 return AE_OK;
111}
112
113acpi_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
124EXPORT_SYMBOL(acpi_get_child);
125
126/* Link ACPI devices with physical devices */
127static 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 */
134struct 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
145EXPORT_SYMBOL(acpi_get_physical_device);
146
147static int acpi_bind_one(struct device *dev, acpi_handle handle)
148{
149 acpi_status status;
150
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100151 if (dev->archdata.acpi_handle) {
David Shaohua Li4e10d122005-03-18 18:45:35 -0500152 printk(KERN_WARNING PREFIX
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100153 "Drivers changed 'acpi_handle' for %s\n", dev->bus_id);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500154 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 }
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100162 dev->archdata.acpi_handle = handle;
David Shaohua Li4e10d122005-03-18 18:45:35 -0500163
164 return 0;
165}
166
167static int acpi_unbind_one(struct device *dev)
168{
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100169 if (!dev->archdata.acpi_handle)
David Shaohua Li4e10d122005-03-18 18:45:35 -0500170 return 0;
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100171 if (dev == acpi_get_physical_device(dev->archdata.acpi_handle)) {
David Shaohua Li4e10d122005-03-18 18:45:35 -0500172 /* acpi_get_physical_device increase refcnt by one */
173 put_device(dev);
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100174 acpi_detach_data(dev->archdata.acpi_handle,
175 acpi_glue_data_handler);
176 dev->archdata.acpi_handle = NULL;
David Shaohua Li4e10d122005-03-18 18:45:35 -0500177 /* acpi_bind_one increase refcnt by one */
178 put_device(dev);
179 } else {
180 printk(KERN_ERR PREFIX
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100181 "Oops, 'acpi_handle' corrupt for %s\n", dev->bus_id);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500182 }
183 return 0;
184}
185
186static 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) {
David Shaohua Lief7b06c2005-04-18 22:59:23 -0400199 DBG("No ACPI bus support for %s\n", dev->bus_id);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500200 ret = -EINVAL;
201 goto end;
202 }
203 if ((ret = type->find_device(dev, &handle)) != 0)
David Shaohua Lief7b06c2005-04-18 22:59:23 -0400204 DBG("Can't get handler for %s\n", dev->bus_id);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500205 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
Benjamin Herrenschmidt465ae642006-11-11 17:18:42 +1100213 acpi_get_name(dev->archdata.acpi_handle,
214 ACPI_FULL_PATHNAME, &buffer);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500215 DBG("Device %s -> %s\n", dev->bus_id, (char *)buffer.pointer);
Len Brown02438d82006-06-30 03:19:10 -0400216 kfree(buffer.pointer);
David Shaohua Li4e10d122005-03-18 18:45:35 -0500217 } else
218 DBG("Device %s -> No ACPI support\n", dev->bus_id);
219#endif
220
221 return ret;
222}
223
224static int acpi_platform_notify_remove(struct device *dev)
225{
226 acpi_unbind_one(dev);
227 return 0;
228}
229
230static 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
243arch_initcall(init_acpi_device_notify);
David Brownella74388e2007-02-05 16:09:11 -0800244
245
246#if defined(CONFIG_RTC_DRV_CMOS) || defined(CONFIG_RTC_DRV_CMOS_MODULE)
247
David Brownellf5f72b42007-05-08 00:34:02 -0700248#ifdef CONFIG_PM
249static 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
256static inline void rtc_wake_setup(void)
257{
258 acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, NULL);
259}
260
261static 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
267static 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
David Brownella74388e2007-02-05 16:09:11 -0800277/* 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
284static struct cmos_rtc_board_info rtc_info;
285
286
David Brownella74388e2007-02-05 16:09:11 -0800287/* PNP devices are registered in a subsys_initcall();
288 * ACPI specifies the PNP IDs to use.
289 */
290#include <linux/pnp.h>
291
292static 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
305static struct device *__init get_rtc_dev(void)
306{
307 return bus_find_device(&pnp_bus_type, NULL, NULL, pnp_match);
308}
309
David Brownella74388e2007-02-05 16:09:11 -0800310static int __init acpi_rtc_init(void)
311{
312 struct device *dev = get_rtc_dev();
313
314 if (dev) {
David Brownellf5f72b42007-05-08 00:34:02 -0700315 rtc_wake_setup();
316 rtc_info.wake_on = rtc_wake_on;
317 rtc_info.wake_off = rtc_wake_off;
318
David Brownell19bfe372007-05-08 00:34:03 -0700319 /* 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
David Brownella74388e2007-02-05 16:09:11 -0800325 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
David Brownellf5f72b42007-05-08 00:34:02 -0700329 /* NOTE: S4_RTC_WAKE is NOT currently useful to Linux */
330 if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
David Brownell19bfe372007-05-08 00:34:03 -0700331 printk(PREFIX "RTC can wake from S4\n");
332
David Brownella74388e2007-02-05 16:09:11 -0800333
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
David Brownell19bfe372007-05-08 00:34:03 -0700341 DBG("RTC unavailable?\n");
David Brownella74388e2007-02-05 16:09:11 -0800342 return 0;
343}
344/* do this between RTC subsys_initcall() and rtc_cmos driver_initcall() */
345fs_initcall(acpi_rtc_init);
346
347#endif