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(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
= dev
->data
;
85 acpi_handle handle
= acpi_dev
->handle
;
86 struct acpi_buffer buffer
;
89 pnp_dbg(&dev
->dev
, "set resources\n");
90 ret
= pnpacpi_build_resource_template(dev
, &buffer
);
93 ret
= pnpacpi_encode_resources(dev
, &buffer
);
95 kfree(buffer
.pointer
);
98 if (ACPI_FAILURE(acpi_set_current_resources(handle
, &buffer
)))
100 else if (acpi_bus_power_manageable(handle
))
101 ret
= acpi_bus_set_power(handle
, ACPI_STATE_D0
);
102 kfree(buffer
.pointer
);
106 static int pnpacpi_disable_resources(struct pnp_dev
*dev
)
108 struct acpi_device
*acpi_dev
= dev
->data
;
109 acpi_handle handle
= acpi_dev
->handle
;
112 dev_dbg(&dev
->dev
, "disable resources\n");
114 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
116 if (acpi_bus_power_manageable(handle
))
117 acpi_bus_set_power(handle
, ACPI_STATE_D3
);
118 /* continue even if acpi_bus_set_power() fails */
119 if (ACPI_FAILURE(acpi_evaluate_object(handle
, "_DIS", NULL
, NULL
)))
124 #ifdef CONFIG_ACPI_SLEEP
125 static bool pnpacpi_can_wakeup(struct pnp_dev
*dev
)
127 struct acpi_device
*acpi_dev
= dev
->data
;
128 acpi_handle handle
= acpi_dev
->handle
;
130 return acpi_bus_can_wakeup(handle
);
133 static int pnpacpi_suspend(struct pnp_dev
*dev
, pm_message_t state
)
135 struct acpi_device
*acpi_dev
= dev
->data
;
136 acpi_handle handle
= acpi_dev
->handle
;
139 if (device_can_wakeup(&dev
->dev
)) {
140 int rc
= acpi_pm_device_sleep_wake(&dev
->dev
,
141 device_may_wakeup(&dev
->dev
));
146 power_state
= acpi_pm_device_sleep_state(&dev
->dev
, NULL
);
148 power_state
= (state
.event
== PM_EVENT_ON
) ?
149 ACPI_STATE_D0
: ACPI_STATE_D3
;
151 /* acpi_bus_set_power() often fails (keyboard port can't be
152 * powered-down?), and in any case, our return value is ignored
153 * by pnp_bus_suspend(). Hence we don't revert the wakeup
154 * setting if the set_power fails.
156 return acpi_bus_set_power(handle
, power_state
);
159 static int pnpacpi_resume(struct pnp_dev
*dev
)
161 struct acpi_device
*acpi_dev
= dev
->data
;
162 acpi_handle handle
= acpi_dev
->handle
;
164 if (device_may_wakeup(&dev
->dev
))
165 acpi_pm_device_sleep_wake(&dev
->dev
, false);
166 return acpi_bus_set_power(handle
, ACPI_STATE_D0
);
170 struct pnp_protocol pnpacpi_protocol
= {
171 .name
= "Plug and Play ACPI",
172 .get
= pnpacpi_get_resources
,
173 .set
= pnpacpi_set_resources
,
174 .disable
= pnpacpi_disable_resources
,
175 #ifdef CONFIG_ACPI_SLEEP
176 .can_wakeup
= pnpacpi_can_wakeup
,
177 .suspend
= pnpacpi_suspend
,
178 .resume
= pnpacpi_resume
,
181 EXPORT_SYMBOL(pnpacpi_protocol
);
183 static int __init
pnpacpi_add_device(struct acpi_device
*device
)
185 acpi_handle temp
= NULL
;
188 struct acpi_hardware_id
*id
;
191 * If a PnPacpi device is not present , the device
192 * driver should not be loaded.
194 status
= acpi_get_handle(device
->handle
, "_CRS", &temp
);
195 if (ACPI_FAILURE(status
) || !ispnpidacpi(acpi_device_hid(device
)) ||
196 is_exclusive_device(device
) || (!device
->status
.present
))
199 dev
= pnp_alloc_dev(&pnpacpi_protocol
, num
, acpi_device_hid(device
));
204 /* .enabled means the device can decode the resources */
205 dev
->active
= device
->status
.enabled
;
206 status
= acpi_get_handle(device
->handle
, "_SRS", &temp
);
207 if (ACPI_SUCCESS(status
))
208 dev
->capabilities
|= PNP_CONFIGURABLE
;
209 dev
->capabilities
|= PNP_READ
;
210 if (device
->flags
.dynamic_status
&& (dev
->capabilities
& PNP_CONFIGURABLE
))
211 dev
->capabilities
|= PNP_WRITE
;
212 if (device
->flags
.removable
)
213 dev
->capabilities
|= PNP_REMOVABLE
;
214 status
= acpi_get_handle(device
->handle
, "_DIS", &temp
);
215 if (ACPI_SUCCESS(status
))
216 dev
->capabilities
|= PNP_DISABLE
;
218 if (strlen(acpi_device_name(device
)))
219 strncpy(dev
->name
, acpi_device_name(device
), sizeof(dev
->name
));
221 strncpy(dev
->name
, acpi_device_bid(device
), sizeof(dev
->name
));
224 pnpacpi_parse_allocated_resource(dev
);
226 if (dev
->capabilities
& PNP_CONFIGURABLE
)
227 pnpacpi_parse_resource_option_data(dev
);
229 list_for_each_entry(id
, &device
->pnp
.ids
, list
) {
230 if (!strcmp(id
->id
, acpi_device_hid(device
)))
232 if (!ispnpidacpi(id
->id
))
234 pnp_add_id(dev
, id
->id
);
237 /* clear out the damaged flags */
239 pnp_init_resources(dev
);
246 static acpi_status __init
pnpacpi_add_device_handler(acpi_handle handle
,
247 u32 lvl
, void *context
,
250 struct acpi_device
*device
;
252 if (!acpi_bus_get_device(handle
, &device
))
253 pnpacpi_add_device(device
);
255 return AE_CTRL_DEPTH
;
259 static int __init
acpi_pnp_match(struct device
*dev
, void *_pnp
)
261 struct acpi_device
*acpi
= to_acpi_device(dev
);
262 struct pnp_dev
*pnp
= _pnp
;
264 /* true means it matched */
265 return !acpi_get_physical_device(acpi
->handle
)
266 && compare_pnp_id(pnp
->id
, acpi_device_hid(acpi
));
269 static int __init
acpi_pnp_find_device(struct device
*dev
, acpi_handle
* handle
)
272 struct acpi_device
*acpi
;
274 adev
= bus_find_device(&acpi_bus_type
, NULL
,
275 to_pnp_dev(dev
), acpi_pnp_match
);
279 acpi
= to_acpi_device(adev
);
280 *handle
= acpi
->handle
;
285 /* complete initialization of a PNPACPI device includes having
286 * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
288 static struct acpi_bus_type __initdata acpi_pnp_bus
= {
289 .bus
= &pnp_bus_type
,
290 .find_device
= acpi_pnp_find_device
,
293 int pnpacpi_disabled __initdata
;
294 static int __init
pnpacpi_init(void)
296 if (acpi_disabled
|| pnpacpi_disabled
) {
297 printk(KERN_INFO
"pnp: PnP ACPI: disabled\n");
300 printk(KERN_INFO
"pnp: PnP ACPI init\n");
301 pnp_register_protocol(&pnpacpi_protocol
);
302 register_acpi_bus_type(&acpi_pnp_bus
);
303 acpi_get_devices(NULL
, pnpacpi_add_device_handler
, NULL
, NULL
);
304 printk(KERN_INFO
"pnp: PnP ACPI: found %d devices\n", num
);
305 unregister_acpi_bus_type(&acpi_pnp_bus
);
306 pnp_platform_devices
= 1;
310 fs_initcall(pnpacpi_init
);
312 static int __init
pnpacpi_setup(char *str
)
316 if (!strncmp(str
, "off", 3))
317 pnpacpi_disabled
= 1;
321 __setup("pnpacpi=", pnpacpi_setup
);