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;
88 pnp_dbg(&dev->dev, "set resources\n");
90 handle = ACPI_HANDLE(&dev->dev);
91 if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
92 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
96 if (WARN_ON_ONCE(acpi_dev != dev->data))
99 if (acpi_has_method(handle, METHOD_NAME__SRS)) {
100 struct acpi_buffer buffer;
102 ret = pnpacpi_build_resource_template(dev, &buffer);
106 ret = pnpacpi_encode_resources(dev, &buffer);
110 status = acpi_set_current_resources(handle, &buffer);
111 if (ACPI_FAILURE(status))
114 kfree(buffer.pointer);
116 if (!ret && acpi_bus_power_manageable(handle))
117 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
122 static int pnpacpi_disable_resources(struct pnp_dev *dev)
124 struct acpi_device *acpi_dev;
128 dev_dbg(&dev->dev, "disable resources\n");
130 handle = ACPI_HANDLE(&dev->dev);
131 if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
132 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
136 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
137 if (acpi_bus_power_manageable(handle))
138 acpi_bus_set_power(handle, ACPI_STATE_D3_COLD);
140 /* continue even if acpi_bus_set_power() fails */
141 status = acpi_evaluate_object(handle, "_DIS", NULL, NULL);
142 if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
148 #ifdef CONFIG_ACPI_SLEEP
149 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
151 struct acpi_device *acpi_dev;
154 handle = ACPI_HANDLE(&dev->dev);
155 if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
156 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
160 return acpi_bus_can_wakeup(handle);
163 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
165 struct acpi_device *acpi_dev;
169 handle = ACPI_HANDLE(&dev->dev);
170 if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
171 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
175 if (device_can_wakeup(&dev->dev)) {
176 error = acpi_pm_device_sleep_wake(&dev->dev,
177 device_may_wakeup(&dev->dev));
182 if (acpi_bus_power_manageable(handle)) {
183 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
186 power_state = (state.event == PM_EVENT_ON) ?
187 ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
190 * acpi_bus_set_power() often fails (keyboard port can't be
191 * powered-down?), and in any case, our return value is ignored
192 * by pnp_bus_suspend(). Hence we don't revert the wakeup
193 * setting if the set_power fails.
195 error = acpi_bus_set_power(handle, power_state);
201 static int pnpacpi_resume(struct pnp_dev *dev)
203 struct acpi_device *acpi_dev;
204 acpi_handle handle = ACPI_HANDLE(&dev->dev);
207 if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
208 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
212 if (device_may_wakeup(&dev->dev))
213 acpi_pm_device_sleep_wake(&dev->dev, false);
215 if (acpi_bus_power_manageable(handle))
216 error = acpi_bus_set_power(handle, ACPI_STATE_D0);
222 struct pnp_protocol pnpacpi_protocol = {
223 .name = "Plug and Play ACPI",
224 .get = pnpacpi_get_resources,
225 .set = pnpacpi_set_resources,
226 .disable = pnpacpi_disable_resources,
227 #ifdef CONFIG_ACPI_SLEEP
228 .can_wakeup = pnpacpi_can_wakeup,
229 .suspend = pnpacpi_suspend,
230 .resume = pnpacpi_resume,
233 EXPORT_SYMBOL(pnpacpi_protocol);
235 static char *__init pnpacpi_get_id(struct acpi_device *device)
237 struct acpi_hardware_id *id;
239 list_for_each_entry(id, &device->pnp.ids, list) {
240 if (ispnpidacpi(id->id))
247 static int __init pnpacpi_add_device(struct acpi_device *device)
251 struct acpi_hardware_id *id;
254 /* Skip devices that are already bound */
255 if (device->physical_node_count)
259 * If a PnPacpi device is not present , the device
260 * driver should not be loaded.
262 if (!acpi_has_method(device->handle, "_CRS"))
265 pnpid = pnpacpi_get_id(device);
269 if (is_exclusive_device(device) || !device->status.present)
272 dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
277 /* .enabled means the device can decode the resources */
278 dev->active = device->status.enabled;
279 if (acpi_has_method(device->handle, "_SRS"))
280 dev->capabilities |= PNP_CONFIGURABLE;
281 dev->capabilities |= PNP_READ;
282 if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
283 dev->capabilities |= PNP_WRITE;
284 if (device->flags.removable)
285 dev->capabilities |= PNP_REMOVABLE;
286 if (acpi_has_method(device->handle, "_DIS"))
287 dev->capabilities |= PNP_DISABLE;
289 if (strlen(acpi_device_name(device)))
290 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
292 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
295 pnpacpi_parse_allocated_resource(dev);
297 if (dev->capabilities & PNP_CONFIGURABLE)
298 pnpacpi_parse_resource_option_data(dev);
300 list_for_each_entry(id, &device->pnp.ids, list) {
301 if (!strcmp(id->id, pnpid))
303 if (!ispnpidacpi(id->id))
305 pnp_add_id(dev, id->id);
308 /* clear out the damaged flags */
310 pnp_init_resources(dev);
312 error = pnp_add_device(dev);
314 put_device(&dev->dev);
323 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
324 u32 lvl, void *context,
327 struct acpi_device *device;
329 if (!acpi_bus_get_device(handle, &device))
330 pnpacpi_add_device(device);
332 return AE_CTRL_DEPTH;
336 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
338 struct acpi_device *acpi = to_acpi_device(dev);
339 struct pnp_dev *pnp = _pnp;
341 /* true means it matched */
342 return !acpi->physical_node_count
343 && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
346 static struct acpi_device * __init acpi_pnp_find_companion(struct device *dev)
348 dev = bus_find_device(&acpi_bus_type, NULL, to_pnp_dev(dev),
354 return to_acpi_device(dev);
357 /* complete initialization of a PNPACPI device includes having
358 * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
360 static bool acpi_pnp_bus_match(struct device *dev)
362 return dev->bus == &pnp_bus_type;
365 static struct acpi_bus_type __initdata acpi_pnp_bus = {
367 .match = acpi_pnp_bus_match,
368 .find_companion = acpi_pnp_find_companion,
371 int pnpacpi_disabled __initdata;
372 static int __init pnpacpi_init(void)
374 if (acpi_disabled || pnpacpi_disabled) {
375 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
378 printk(KERN_INFO "pnp: PnP ACPI init\n");
379 pnp_register_protocol(&pnpacpi_protocol);
380 register_acpi_bus_type(&acpi_pnp_bus);
381 acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
382 printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
383 unregister_acpi_bus_type(&acpi_pnp_bus);
384 pnp_platform_devices = 1;
388 fs_initcall(pnpacpi_init);
390 static int __init pnpacpi_setup(char *str)
394 if (!strncmp(str, "off", 3))
395 pnpacpi_disabled = 1;
399 __setup("pnpacpi=", pnpacpi_setup);