2 * pnpacpi -- PnP ACPI driver
4 * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
5 * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2, or (at your option) any
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/export.h>
23 #include <linux/acpi.h>
24 #include <linux/pnp.h>
25 #include <linux/slab.h>
26 #include <linux/mod_devicetable.h>
33 /* We need only to blacklist devices that have already an acpi driver that
34 * can't use pnp layer. We don't need to blacklist device that are directly
35 * used by the kernel (PCI root, ...), as it is harmless and there were
36 * already present in pnpbios. But there is an exception for devices that
37 * have irqs (PIC, Timer) because we call acpi_register_gsi.
38 * Finally, only devices that have a CRS method need to be in this list.
40 static struct acpi_device_id excluded_id_list
[] __initdata
= {
41 {"PNP0C09", 0}, /* EC */
42 {"PNP0C0F", 0}, /* Link device */
43 {"PNP0000", 0}, /* PIC */
44 {"PNP0100", 0}, /* Timer */
48 static inline int __init
is_exclusive_device(struct acpi_device
*dev
)
50 return (!acpi_match_device_ids(dev
, excluded_id_list
));
54 * Compatible Device IDs
57 if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
59 #define TEST_ALPHA(c) \
60 if (!('A' <= (c) && (c) <= 'Z')) \
62 static int __init
ispnpidacpi(const char *id
)
76 static int pnpacpi_get_resources(struct pnp_dev
*dev
)
78 pnp_dbg(&dev
->dev
, "get resources\n");
79 return pnpacpi_parse_allocated_resource(dev
);
82 static int pnpacpi_set_resources(struct pnp_dev
*dev
)
84 struct acpi_device
*acpi_dev
;
86 struct acpi_buffer buffer
;
89 pnp_dbg(&dev
->dev
, "set resources\n");
91 handle
= ACPI_HANDLE(&dev
->dev
);
92 if (!handle
|| acpi_bus_get_device(handle
, &acpi_dev
)) {
93 dev_dbg(&dev
->dev
, "ACPI device not found in %s!\n", __func__
);
97 if (WARN_ON_ONCE(acpi_dev
!= dev
->data
))
100 ret
= pnpacpi_build_resource_template(dev
, &buffer
);
103 ret
= pnpacpi_encode_resources(dev
, &buffer
);
105 kfree(buffer
.pointer
);
108 if (ACPI_FAILURE(acpi_set_current_resources(handle
, &buffer
)))
110 else if (acpi_bus_power_manageable(handle
))
111 ret
= acpi_bus_set_power(handle
, ACPI_STATE_D0
);
112 kfree(buffer
.pointer
);
116 static int pnpacpi_disable_resources(struct pnp_dev
*dev
)
118 struct acpi_device
*acpi_dev
;
122 dev_dbg(&dev
->dev
, "disable resources\n");
124 handle
= ACPI_HANDLE(&dev
->dev
);
125 if (!handle
|| acpi_bus_get_device(handle
, &acpi_dev
)) {
126 dev_dbg(&dev
->dev
, "ACPI device not found in %s!\n", __func__
);
130 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
132 if (acpi_bus_power_manageable(handle
))
133 acpi_bus_set_power(handle
, ACPI_STATE_D3_COLD
);
134 /* continue even if acpi_bus_set_power() fails */
135 if (ACPI_FAILURE(acpi_evaluate_object(handle
, "_DIS", NULL
, NULL
)))
140 #ifdef CONFIG_ACPI_SLEEP
141 static bool pnpacpi_can_wakeup(struct pnp_dev
*dev
)
143 struct acpi_device
*acpi_dev
;
146 handle
= ACPI_HANDLE(&dev
->dev
);
147 if (!handle
|| acpi_bus_get_device(handle
, &acpi_dev
)) {
148 dev_dbg(&dev
->dev
, "ACPI device not found in %s!\n", __func__
);
152 return acpi_bus_can_wakeup(handle
);
155 static int pnpacpi_suspend(struct pnp_dev
*dev
, pm_message_t state
)
157 struct acpi_device
*acpi_dev
;
161 handle
= ACPI_HANDLE(&dev
->dev
);
162 if (!handle
|| acpi_bus_get_device(handle
, &acpi_dev
)) {
163 dev_dbg(&dev
->dev
, "ACPI device not found in %s!\n", __func__
);
167 if (device_can_wakeup(&dev
->dev
)) {
168 error
= acpi_pm_device_sleep_wake(&dev
->dev
,
169 device_may_wakeup(&dev
->dev
));
174 if (acpi_bus_power_manageable(handle
)) {
175 int power_state
= acpi_pm_device_sleep_state(&dev
->dev
, NULL
,
178 power_state
= (state
.event
== PM_EVENT_ON
) ?
179 ACPI_STATE_D0
: ACPI_STATE_D3_COLD
;
182 * acpi_bus_set_power() often fails (keyboard port can't be
183 * powered-down?), and in any case, our return value is ignored
184 * by pnp_bus_suspend(). Hence we don't revert the wakeup
185 * setting if the set_power fails.
187 error
= acpi_bus_set_power(handle
, power_state
);
193 static int pnpacpi_resume(struct pnp_dev
*dev
)
195 struct acpi_device
*acpi_dev
;
196 acpi_handle handle
= ACPI_HANDLE(&dev
->dev
);
199 if (!handle
|| acpi_bus_get_device(handle
, &acpi_dev
)) {
200 dev_dbg(&dev
->dev
, "ACPI device not found in %s!\n", __func__
);
204 if (device_may_wakeup(&dev
->dev
))
205 acpi_pm_device_sleep_wake(&dev
->dev
, false);
207 if (acpi_bus_power_manageable(handle
))
208 error
= acpi_bus_set_power(handle
, ACPI_STATE_D0
);
214 struct pnp_protocol pnpacpi_protocol
= {
215 .name
= "Plug and Play ACPI",
216 .get
= pnpacpi_get_resources
,
217 .set
= pnpacpi_set_resources
,
218 .disable
= pnpacpi_disable_resources
,
219 #ifdef CONFIG_ACPI_SLEEP
220 .can_wakeup
= pnpacpi_can_wakeup
,
221 .suspend
= pnpacpi_suspend
,
222 .resume
= pnpacpi_resume
,
225 EXPORT_SYMBOL(pnpacpi_protocol
);
227 static char *__init
pnpacpi_get_id(struct acpi_device
*device
)
229 struct acpi_hardware_id
*id
;
231 list_for_each_entry(id
, &device
->pnp
.ids
, list
) {
232 if (ispnpidacpi(id
->id
))
239 static int __init
pnpacpi_add_device(struct acpi_device
*device
)
243 struct acpi_hardware_id
*id
;
246 /* Skip devices that are already bound */
247 if (device
->physical_node_count
)
251 * If a PnPacpi device is not present , the device
252 * driver should not be loaded.
254 if (!acpi_has_method(device
->handle
, "_CRS"))
257 pnpid
= pnpacpi_get_id(device
);
261 if (is_exclusive_device(device
) || !device
->status
.present
)
264 dev
= pnp_alloc_dev(&pnpacpi_protocol
, num
, pnpid
);
269 /* .enabled means the device can decode the resources */
270 dev
->active
= device
->status
.enabled
;
271 if (acpi_has_method(device
->handle
, "_SRS"))
272 dev
->capabilities
|= PNP_CONFIGURABLE
;
273 dev
->capabilities
|= PNP_READ
;
274 if (device
->flags
.dynamic_status
&& (dev
->capabilities
& PNP_CONFIGURABLE
))
275 dev
->capabilities
|= PNP_WRITE
;
276 if (device
->flags
.removable
)
277 dev
->capabilities
|= PNP_REMOVABLE
;
278 if (acpi_has_method(device
->handle
, "_DIS"))
279 dev
->capabilities
|= PNP_DISABLE
;
281 if (strlen(acpi_device_name(device
)))
282 strncpy(dev
->name
, acpi_device_name(device
), sizeof(dev
->name
));
284 strncpy(dev
->name
, acpi_device_bid(device
), sizeof(dev
->name
));
287 pnpacpi_parse_allocated_resource(dev
);
289 if (dev
->capabilities
& PNP_CONFIGURABLE
)
290 pnpacpi_parse_resource_option_data(dev
);
292 list_for_each_entry(id
, &device
->pnp
.ids
, list
) {
293 if (!strcmp(id
->id
, pnpid
))
295 if (!ispnpidacpi(id
->id
))
297 pnp_add_id(dev
, id
->id
);
300 /* clear out the damaged flags */
302 pnp_init_resources(dev
);
304 error
= pnp_add_device(dev
);
306 put_device(&dev
->dev
);
315 static acpi_status __init
pnpacpi_add_device_handler(acpi_handle handle
,
316 u32 lvl
, void *context
,
319 struct acpi_device
*device
;
321 if (!acpi_bus_get_device(handle
, &device
))
322 pnpacpi_add_device(device
);
324 return AE_CTRL_DEPTH
;
328 static int __init
acpi_pnp_match(struct device
*dev
, void *_pnp
)
330 struct acpi_device
*acpi
= to_acpi_device(dev
);
331 struct pnp_dev
*pnp
= _pnp
;
333 /* true means it matched */
334 return !acpi
->physical_node_count
335 && compare_pnp_id(pnp
->id
, acpi_device_hid(acpi
));
338 static struct acpi_device
* __init
acpi_pnp_find_companion(struct device
*dev
)
340 dev
= bus_find_device(&acpi_bus_type
, NULL
, to_pnp_dev(dev
),
346 return to_acpi_device(dev
);
349 /* complete initialization of a PNPACPI device includes having
350 * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
352 static bool acpi_pnp_bus_match(struct device
*dev
)
354 return dev
->bus
== &pnp_bus_type
;
357 static struct acpi_bus_type __initdata acpi_pnp_bus
= {
359 .match
= acpi_pnp_bus_match
,
360 .find_companion
= acpi_pnp_find_companion
,
363 int pnpacpi_disabled __initdata
;
364 static int __init
pnpacpi_init(void)
366 if (acpi_disabled
|| pnpacpi_disabled
) {
367 printk(KERN_INFO
"pnp: PnP ACPI: disabled\n");
370 printk(KERN_INFO
"pnp: PnP ACPI init\n");
371 pnp_register_protocol(&pnpacpi_protocol
);
372 register_acpi_bus_type(&acpi_pnp_bus
);
373 acpi_get_devices(NULL
, pnpacpi_add_device_handler
, NULL
, NULL
);
374 printk(KERN_INFO
"pnp: PnP ACPI: found %d devices\n", num
);
375 unregister_acpi_bus_type(&acpi_pnp_bus
);
376 pnp_platform_devices
= 1;
380 fs_initcall(pnpacpi_init
);
382 static int __init
pnpacpi_setup(char *str
)
386 if (!strncmp(str
, "off", 3))
387 pnpacpi_disabled
= 1;
391 __setup("pnpacpi=", pnpacpi_setup
);