PNP / ACPI: Use DEVICE_ACPI_HANDLE() for device ACPI handle access
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / pnp / pnpacpi / core.c
blobca84d5099ce7c5fa654a39fa38427f8209b9a03d
1 /*
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
10 * later version.
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>
28 #include "../base.h"
29 #include "pnpacpi.h"
31 static int num;
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 */
45 {"", 0},
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
56 #define TEST_HEX(c) \
57 if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
58 return 0
59 #define TEST_ALPHA(c) \
60 if (!('@' <= (c) || (c) <= 'Z')) \
61 return 0
62 static int __init ispnpidacpi(const char *id)
64 TEST_ALPHA(id[0]);
65 TEST_ALPHA(id[1]);
66 TEST_ALPHA(id[2]);
67 TEST_HEX(id[3]);
68 TEST_HEX(id[4]);
69 TEST_HEX(id[5]);
70 TEST_HEX(id[6]);
71 if (id[7] != '\0')
72 return 0;
73 return 1;
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;
85 acpi_handle handle;
86 struct acpi_buffer buffer;
87 int ret;
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__);
94 return -ENODEV;
97 ret = pnpacpi_build_resource_template(dev, &buffer);
98 if (ret)
99 return ret;
100 ret = pnpacpi_encode_resources(dev, &buffer);
101 if (ret) {
102 kfree(buffer.pointer);
103 return ret;
105 if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
106 ret = -EINVAL;
107 else if (acpi_bus_power_manageable(handle))
108 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
109 kfree(buffer.pointer);
110 return ret;
113 static int pnpacpi_disable_resources(struct pnp_dev *dev)
115 struct acpi_device *acpi_dev;
116 acpi_handle handle;
117 int ret;
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__);
124 return 0;
127 /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
128 ret = 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)))
133 ret = -ENODEV;
134 return ret;
137 #ifdef CONFIG_ACPI_SLEEP
138 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
140 struct acpi_device *acpi_dev;
141 acpi_handle handle;
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__);
146 return false;
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;
155 acpi_handle handle;
156 int error = 0;
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__);
161 return 0;
164 if (device_can_wakeup(&dev->dev)) {
165 error = acpi_pm_device_sleep_wake(&dev->dev,
166 device_may_wakeup(&dev->dev));
167 if (error)
168 return error;
171 if (acpi_bus_power_manageable(handle)) {
172 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
174 if (power_state < 0)
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);
187 return error;
190 static int pnpacpi_resume(struct pnp_dev *dev)
192 struct acpi_device *acpi_dev;
193 acpi_handle handle = DEVICE_ACPI_HANDLE(&dev->dev);
194 int error = 0;
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__);
198 return -ENODEV;
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);
207 return error;
209 #endif
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,
220 #endif
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))
230 return id->id;
233 return NULL;
236 static int __init pnpacpi_add_device(struct acpi_device *device)
238 acpi_handle temp = NULL;
239 acpi_status status;
240 struct pnp_dev *dev;
241 char *pnpid;
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))
250 return 0;
252 pnpid = pnpacpi_get_id(device);
253 if (!pnpid)
254 return 0;
256 if (is_exclusive_device(device) || !device->status.present)
257 return 0;
259 dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
260 if (!dev)
261 return -ENOMEM;
263 dev->data = device;
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));
280 else
281 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
283 if (dev->active)
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))
291 continue;
292 if (!ispnpidacpi(id->id))
293 continue;
294 pnp_add_id(dev, id->id);
297 /* clear out the damaged flags */
298 if (!dev->active)
299 pnp_init_resources(dev);
300 pnp_add_device(dev);
301 num++;
303 return AE_OK;
306 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
307 u32 lvl, void *context,
308 void **rv)
310 struct acpi_device *device;
312 if (!acpi_bus_get_device(handle, &device))
313 pnpacpi_add_device(device);
314 else
315 return AE_CTRL_DEPTH;
316 return AE_OK;
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)
331 struct device *adev;
332 struct acpi_device *acpi;
334 adev = bus_find_device(&acpi_bus_type, NULL,
335 to_pnp_dev(dev), acpi_pnp_match);
336 if (!adev)
337 return -ENODEV;
339 acpi = to_acpi_device(adev);
340 *handle = acpi->handle;
341 put_device(adev);
342 return 0;
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");
358 return 0;
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;
367 return 0;
370 fs_initcall(pnpacpi_init);
372 static int __init pnpacpi_setup(char *str)
374 if (str == NULL)
375 return 1;
376 if (!strncmp(str, "off", 3))
377 pnpacpi_disabled = 1;
378 return 1;
381 __setup("pnpacpi=", pnpacpi_setup);