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>
27 #include <acpi/acpi_bus.h>
34 /* We need only to blacklist devices that have already an acpi driver that
35 * can't use pnp layer. We don't need to blacklist device that are directly
36 * used by the kernel (PCI root, ...), as it is harmless and there were
37 * already present in pnpbios. But there is an exception for devices that
38 * have irqs (PIC, Timer) because we call acpi_register_gsi.
39 * Finally, only devices that have a CRS method need to be in this list.
41 static struct acpi_device_id excluded_id_list[] __initdata = {
42 {"PNP0C09", 0}, /* EC */
43 {"PNP0C0F", 0}, /* Link device */
44 {"PNP0000", 0}, /* PIC */
45 {"PNP0100", 0}, /* Timer */
49 static inline int __init is_exclusive_device(struct acpi_device *dev)
51 return (!acpi_match_device_ids(dev, excluded_id_list));
55 * Compatible Device IDs
58 if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
60 #define TEST_ALPHA(c) \
61 if (!('A' <= (c) && (c) <= 'Z')) \
63 static int __init ispnpidacpi(const char *id)
77 static int pnpacpi_get_resources(struct pnp_dev *dev)
79 pnp_dbg(&dev->dev, "get resources\n");
80 return pnpacpi_parse_allocated_resource(dev);
83 static int pnpacpi_set_resources(struct pnp_dev *dev)
85 struct acpi_device *acpi_dev;
87 struct acpi_buffer buffer;
90 pnp_dbg(&dev->dev, "set resources\n");
92 handle = DEVICE_ACPI_HANDLE(&dev->dev);
93 if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
94 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
98 if (WARN_ON_ONCE(acpi_dev != dev->data))
101 ret = pnpacpi_build_resource_template(dev, &buffer);
104 ret = pnpacpi_encode_resources(dev, &buffer);
106 kfree(buffer.pointer);
109 if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
111 else if (acpi_bus_power_manageable(handle))
112 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
113 kfree(buffer.pointer);
117 static int pnpacpi_disable_resources(struct pnp_dev *dev)
119 struct acpi_device *acpi_dev;
123 dev_dbg(&dev->dev, "disable resources\n");
125 handle = DEVICE_ACPI_HANDLE(&dev->dev);
126 if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
127 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
131 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
133 if (acpi_bus_power_manageable(handle))
134 acpi_bus_set_power(handle, ACPI_STATE_D3_COLD);
135 /* continue even if acpi_bus_set_power() fails */
136 if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
141 #ifdef CONFIG_ACPI_SLEEP
142 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
144 struct acpi_device *acpi_dev;
147 handle = DEVICE_ACPI_HANDLE(&dev->dev);
148 if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
149 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
153 return acpi_bus_can_wakeup(handle);
156 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
158 struct acpi_device *acpi_dev;
162 handle = DEVICE_ACPI_HANDLE(&dev->dev);
163 if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
164 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
168 if (device_can_wakeup(&dev->dev)) {
169 error = acpi_pm_device_sleep_wake(&dev->dev,
170 device_may_wakeup(&dev->dev));
175 if (acpi_bus_power_manageable(handle)) {
176 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
179 power_state = (state.event == PM_EVENT_ON) ?
180 ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
183 * acpi_bus_set_power() often fails (keyboard port can't be
184 * powered-down?), and in any case, our return value is ignored
185 * by pnp_bus_suspend(). Hence we don't revert the wakeup
186 * setting if the set_power fails.
188 error = acpi_bus_set_power(handle, power_state);
194 static int pnpacpi_resume(struct pnp_dev *dev)
196 struct acpi_device *acpi_dev;
197 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
200 if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
201 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
205 if (device_may_wakeup(&dev->dev))
206 acpi_pm_device_sleep_wake(&dev->dev, false);
208 if (acpi_bus_power_manageable(handle))
209 error = acpi_bus_set_power(handle, ACPI_STATE_D0);
215 struct pnp_protocol pnpacpi_protocol = {
216 .name = "Plug and Play ACPI",
217 .get = pnpacpi_get_resources,
218 .set = pnpacpi_set_resources,
219 .disable = pnpacpi_disable_resources,
220 #ifdef CONFIG_ACPI_SLEEP
221 .can_wakeup = pnpacpi_can_wakeup,
222 .suspend = pnpacpi_suspend,
223 .resume = pnpacpi_resume,
226 EXPORT_SYMBOL(pnpacpi_protocol);
228 static char *__init pnpacpi_get_id(struct acpi_device *device)
230 struct acpi_hardware_id *id;
232 list_for_each_entry(id, &device->pnp.ids, list) {
233 if (ispnpidacpi(id->id))
240 static int __init pnpacpi_add_device(struct acpi_device *device)
244 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);
309 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
310 u32 lvl, void *context,
313 struct acpi_device *device;
315 if (!acpi_bus_get_device(handle, &device))
316 pnpacpi_add_device(device);
318 return AE_CTRL_DEPTH;
322 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
324 struct acpi_device *acpi = to_acpi_device(dev);
325 struct pnp_dev *pnp = _pnp;
327 /* true means it matched */
328 return !acpi->physical_node_count
329 && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
332 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
335 struct acpi_device *acpi;
337 adev = bus_find_device(&acpi_bus_type, NULL,
338 to_pnp_dev(dev), acpi_pnp_match);
342 acpi = to_acpi_device(adev);
343 *handle = acpi->handle;
348 /* complete initialization of a PNPACPI device includes having
349 * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
351 static bool acpi_pnp_bus_match(struct device *dev)
353 return dev->bus == &pnp_bus_type;
356 static struct acpi_bus_type __initdata acpi_pnp_bus = {
358 .match = acpi_pnp_bus_match,
359 .find_device = acpi_pnp_find_device,
362 int pnpacpi_disabled __initdata;
363 static int __init pnpacpi_init(void)
365 if (acpi_disabled || pnpacpi_disabled) {
366 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
369 printk(KERN_INFO "pnp: PnP ACPI init\n");
370 pnp_register_protocol(&pnpacpi_protocol);
371 register_acpi_bus_type(&acpi_pnp_bus);
372 acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
373 printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
374 unregister_acpi_bus_type(&acpi_pnp_bus);
375 pnp_platform_devices = 1;
379 fs_initcall(pnpacpi_init);
381 static int __init pnpacpi_setup(char *str)
385 if (!strncmp(str, "off", 3))
386 pnpacpi_disabled = 1;
390 __setup("pnpacpi=", pnpacpi_setup);