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/acpi.h>
23 #include <linux/pnp.h>
24 #include <linux/slab.h>
25 #include <linux/mod_devicetable.h>
26 #include <acpi/acpi_bus.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 (!('@' <= (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
= DEVICE_ACPI_HANDLE(&dev
->dev
);
92 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &acpi_dev
))) {
93 dev_dbg(&dev
->dev
, "ACPI device not found in %s!\n", __func__
);
97 ret
= pnpacpi_build_resource_template(dev
, &buffer
);
100 ret
= pnpacpi_encode_resources(dev
, &buffer
);
102 kfree(buffer
.pointer
);
105 if (ACPI_FAILURE(acpi_set_current_resources(handle
, &buffer
)))
107 else if (acpi_bus_power_manageable(handle
))
108 ret
= acpi_bus_set_power(handle
, ACPI_STATE_D0
);
109 kfree(buffer
.pointer
);
113 static int pnpacpi_disable_resources(struct pnp_dev
*dev
)
115 struct acpi_device
*acpi_dev
;
119 dev_dbg(&dev
->dev
, "disable resources\n");
121 handle
= DEVICE_ACPI_HANDLE(&dev
->dev
);
122 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &acpi_dev
))) {
123 dev_dbg(&dev
->dev
, "ACPI device not found in %s!\n", __func__
);
127 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
129 if (acpi_bus_power_manageable(handle
))
130 acpi_bus_set_power(handle
, ACPI_STATE_D3
);
131 /* continue even if acpi_bus_set_power() fails */
132 if (ACPI_FAILURE(acpi_evaluate_object(handle
, "_DIS", NULL
, NULL
)))
137 #ifdef CONFIG_ACPI_SLEEP
138 static bool pnpacpi_can_wakeup(struct pnp_dev
*dev
)
140 struct acpi_device
*acpi_dev
;
143 handle
= DEVICE_ACPI_HANDLE(&dev
->dev
);
144 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &acpi_dev
))) {
145 dev_dbg(&dev
->dev
, "ACPI device not found in %s!\n", __func__
);
149 return acpi_bus_can_wakeup(handle
);
152 static int pnpacpi_suspend(struct pnp_dev
*dev
, pm_message_t state
)
154 struct acpi_device
*acpi_dev
;
158 handle
= DEVICE_ACPI_HANDLE(&dev
->dev
);
159 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &acpi_dev
))) {
160 dev_dbg(&dev
->dev
, "ACPI device not found in %s!\n", __func__
);
164 if (device_can_wakeup(&dev
->dev
)) {
165 error
= acpi_pm_device_sleep_wake(&dev
->dev
,
166 device_may_wakeup(&dev
->dev
));
171 if (acpi_bus_power_manageable(handle
)) {
172 int power_state
= acpi_pm_device_sleep_state(&dev
->dev
, NULL
);
175 power_state
= (state
.event
== PM_EVENT_ON
) ?
176 ACPI_STATE_D0
: ACPI_STATE_D3
;
179 * acpi_bus_set_power() often fails (keyboard port can't be
180 * powered-down?), and in any case, our return value is ignored
181 * by pnp_bus_suspend(). Hence we don't revert the wakeup
182 * setting if the set_power fails.
184 error
= acpi_bus_set_power(handle
, power_state
);
190 static int pnpacpi_resume(struct pnp_dev
*dev
)
192 struct acpi_device
*acpi_dev
;
193 acpi_handle handle
= DEVICE_ACPI_HANDLE(&dev
->dev
);
196 if (!handle
|| ACPI_FAILURE(acpi_bus_get_device(handle
, &acpi_dev
))) {
197 dev_dbg(&dev
->dev
, "ACPI device not found in %s!\n", __func__
);
201 if (device_may_wakeup(&dev
->dev
))
202 acpi_pm_device_sleep_wake(&dev
->dev
, false);
204 if (acpi_bus_power_manageable(handle
))
205 error
= acpi_bus_set_power(handle
, ACPI_STATE_D0
);
211 struct pnp_protocol pnpacpi_protocol
= {
212 .name
= "Plug and Play ACPI",
213 .get
= pnpacpi_get_resources
,
214 .set
= pnpacpi_set_resources
,
215 .disable
= pnpacpi_disable_resources
,
216 #ifdef CONFIG_ACPI_SLEEP
217 .can_wakeup
= pnpacpi_can_wakeup
,
218 .suspend
= pnpacpi_suspend
,
219 .resume
= pnpacpi_resume
,
222 EXPORT_SYMBOL(pnpacpi_protocol
);
224 static char *__init
pnpacpi_get_id(struct acpi_device
*device
)
226 struct acpi_hardware_id
*id
;
228 list_for_each_entry(id
, &device
->pnp
.ids
, list
) {
229 if (ispnpidacpi(id
->id
))
236 static int __init
pnpacpi_add_device(struct acpi_device
*device
)
238 acpi_handle temp
= NULL
;
242 struct acpi_hardware_id
*id
;
245 * If a PnPacpi device is not present , the device
246 * driver should not be loaded.
248 status
= acpi_get_handle(device
->handle
, "_CRS", &temp
);
249 if (ACPI_FAILURE(status
))
252 pnpid
= pnpacpi_get_id(device
);
256 if (is_exclusive_device(device
) || !device
->status
.present
)
259 dev
= pnp_alloc_dev(&pnpacpi_protocol
, num
, pnpid
);
264 /* .enabled means the device can decode the resources */
265 dev
->active
= device
->status
.enabled
;
266 status
= acpi_get_handle(device
->handle
, "_SRS", &temp
);
267 if (ACPI_SUCCESS(status
))
268 dev
->capabilities
|= PNP_CONFIGURABLE
;
269 dev
->capabilities
|= PNP_READ
;
270 if (device
->flags
.dynamic_status
&& (dev
->capabilities
& PNP_CONFIGURABLE
))
271 dev
->capabilities
|= PNP_WRITE
;
272 if (device
->flags
.removable
)
273 dev
->capabilities
|= PNP_REMOVABLE
;
274 status
= acpi_get_handle(device
->handle
, "_DIS", &temp
);
275 if (ACPI_SUCCESS(status
))
276 dev
->capabilities
|= PNP_DISABLE
;
278 if (strlen(acpi_device_name(device
)))
279 strncpy(dev
->name
, acpi_device_name(device
), sizeof(dev
->name
));
281 strncpy(dev
->name
, acpi_device_bid(device
), sizeof(dev
->name
));
284 pnpacpi_parse_allocated_resource(dev
);
286 if (dev
->capabilities
& PNP_CONFIGURABLE
)
287 pnpacpi_parse_resource_option_data(dev
);
289 list_for_each_entry(id
, &device
->pnp
.ids
, list
) {
290 if (!strcmp(id
->id
, pnpid
))
292 if (!ispnpidacpi(id
->id
))
294 pnp_add_id(dev
, id
->id
);
297 /* clear out the damaged flags */
299 pnp_init_resources(dev
);
306 static acpi_status __init
pnpacpi_add_device_handler(acpi_handle handle
,
307 u32 lvl
, void *context
,
310 struct acpi_device
*device
;
312 if (!acpi_bus_get_device(handle
, &device
))
313 pnpacpi_add_device(device
);
315 return AE_CTRL_DEPTH
;
319 static int __init
acpi_pnp_match(struct device
*dev
, void *_pnp
)
321 struct acpi_device
*acpi
= to_acpi_device(dev
);
322 struct pnp_dev
*pnp
= _pnp
;
324 /* true means it matched */
325 return !acpi_get_physical_device(acpi
->handle
)
326 && compare_pnp_id(pnp
->id
, acpi_device_hid(acpi
));
329 static int __init
acpi_pnp_find_device(struct device
*dev
, acpi_handle
* handle
)
332 struct acpi_device
*acpi
;
334 adev
= bus_find_device(&acpi_bus_type
, NULL
,
335 to_pnp_dev(dev
), acpi_pnp_match
);
339 acpi
= to_acpi_device(adev
);
340 *handle
= acpi
->handle
;
345 /* complete initialization of a PNPACPI device includes having
346 * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
348 static struct acpi_bus_type __initdata acpi_pnp_bus
= {
349 .bus
= &pnp_bus_type
,
350 .find_device
= acpi_pnp_find_device
,
353 int pnpacpi_disabled __initdata
;
354 static int __init
pnpacpi_init(void)
356 if (acpi_disabled
|| pnpacpi_disabled
) {
357 printk(KERN_INFO
"pnp: PnP ACPI: disabled\n");
360 printk(KERN_INFO
"pnp: PnP ACPI init\n");
361 pnp_register_protocol(&pnpacpi_protocol
);
362 register_acpi_bus_type(&acpi_pnp_bus
);
363 acpi_get_devices(NULL
, pnpacpi_add_device_handler
, NULL
, NULL
);
364 printk(KERN_INFO
"pnp: PnP ACPI: found %d devices\n", num
);
365 unregister_acpi_bus_type(&acpi_pnp_bus
);
366 pnp_platform_devices
= 1;
370 fs_initcall(pnpacpi_init
);
372 static int __init
pnpacpi_setup(char *str
)
376 if (!strncmp(str
, "off", 3))
377 pnpacpi_disabled
= 1;
381 __setup("pnpacpi=", pnpacpi_setup
);