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Linux/drivers/pnp/pnpacpi/core.c

  1 /*
  2  * pnpacpi -- PnP ACPI driver
  3  *
  4  * Copyright (c) 2004 Matthieu Castet <castet.matthieu@free.fr>
  5  * Copyright (c) 2004 Li Shaohua <shaohua.li@intel.com>
  6  *
  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.
 11  *
 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.
 16  *
 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
 20  */
 21 
 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 
 28 #include "../base.h"
 29 #include "pnpacpi.h"
 30 
 31 static int num;
 32 
 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.
 39  */
 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},
 46 };
 47 
 48 static inline int __init is_exclusive_device(struct acpi_device *dev)
 49 {
 50         return (!acpi_match_device_ids(dev, excluded_id_list));
 51 }
 52 
 53 /*
 54  * Compatible Device IDs
 55  */
 56 #define TEST_HEX(c) \
 57         if (!(('' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
 58                 return 0
 59 #define TEST_ALPHA(c) \
 60         if (!('A' <= (c) && (c) <= 'Z')) \
 61                 return 0
 62 static int __init ispnpidacpi(const char *id)
 63 {
 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;
 74 }
 75 
 76 static int pnpacpi_get_resources(struct pnp_dev *dev)
 77 {
 78         pnp_dbg(&dev->dev, "get resources\n");
 79         return pnpacpi_parse_allocated_resource(dev);
 80 }
 81 
 82 static int pnpacpi_set_resources(struct pnp_dev *dev)
 83 {
 84         struct acpi_device *acpi_dev;
 85         acpi_handle handle;
 86         struct acpi_buffer buffer;
 87         int ret;
 88 
 89         pnp_dbg(&dev->dev, "set resources\n");
 90 
 91         handle = ACPI_HANDLE(&dev->dev);
 92         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
 93                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 94                 return -ENODEV;
 95         }
 96 
 97         if (WARN_ON_ONCE(acpi_dev != dev->data))
 98                 dev->data = acpi_dev;
 99 
100         ret = pnpacpi_build_resource_template(dev, &buffer);
101         if (ret)
102                 return ret;
103         ret = pnpacpi_encode_resources(dev, &buffer);
104         if (ret) {
105                 kfree(buffer.pointer);
106                 return ret;
107         }
108         if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
109                 ret = -EINVAL;
110         else if (acpi_bus_power_manageable(handle))
111                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
112         kfree(buffer.pointer);
113         return ret;
114 }
115 
116 static int pnpacpi_disable_resources(struct pnp_dev *dev)
117 {
118         struct acpi_device *acpi_dev;
119         acpi_handle handle;
120         int ret;
121 
122         dev_dbg(&dev->dev, "disable resources\n");
123 
124         handle = ACPI_HANDLE(&dev->dev);
125         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
126                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
127                 return 0;
128         }
129 
130         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
131         ret = 0;
132         if (acpi_bus_power_manageable(handle))
133                 acpi_bus_set_power(handle, ACPI_STATE_D3_COLD);
134                 /* continue even if acpi_bus_set_power() fails */
135         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
136                 ret = -ENODEV;
137         return ret;
138 }
139 
140 #ifdef CONFIG_ACPI_SLEEP
141 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
142 {
143         struct acpi_device *acpi_dev;
144         acpi_handle handle;
145 
146         handle = ACPI_HANDLE(&dev->dev);
147         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
148                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
149                 return false;
150         }
151 
152         return acpi_bus_can_wakeup(handle);
153 }
154 
155 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
156 {
157         struct acpi_device *acpi_dev;
158         acpi_handle handle;
159         int error = 0;
160 
161         handle = ACPI_HANDLE(&dev->dev);
162         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
163                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
164                 return 0;
165         }
166 
167         if (device_can_wakeup(&dev->dev)) {
168                 error = acpi_pm_device_sleep_wake(&dev->dev,
169                                 device_may_wakeup(&dev->dev));
170                 if (error)
171                         return error;
172         }
173 
174         if (acpi_bus_power_manageable(handle)) {
175                 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
176                                                         ACPI_STATE_D3_COLD);
177                 if (power_state < 0)
178                         power_state = (state.event == PM_EVENT_ON) ?
179                                         ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
180 
181                 /*
182                  * acpi_bus_set_power() often fails (keyboard port can't be
183                  * powered-down?), and in any case, our return value is ignored
184                  * by pnp_bus_suspend().  Hence we don't revert the wakeup
185                  * setting if the set_power fails.
186                  */
187                 error = acpi_bus_set_power(handle, power_state);
188         }
189 
190         return error;
191 }
192 
193 static int pnpacpi_resume(struct pnp_dev *dev)
194 {
195         struct acpi_device *acpi_dev;
196         acpi_handle handle = ACPI_HANDLE(&dev->dev);
197         int error = 0;
198 
199         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
200                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
201                 return -ENODEV;
202         }
203 
204         if (device_may_wakeup(&dev->dev))
205                 acpi_pm_device_sleep_wake(&dev->dev, false);
206 
207         if (acpi_bus_power_manageable(handle))
208                 error = acpi_bus_set_power(handle, ACPI_STATE_D0);
209 
210         return error;
211 }
212 #endif
213 
214 struct pnp_protocol pnpacpi_protocol = {
215         .name    = "Plug and Play ACPI",
216         .get     = pnpacpi_get_resources,
217         .set     = pnpacpi_set_resources,
218         .disable = pnpacpi_disable_resources,
219 #ifdef CONFIG_ACPI_SLEEP
220         .can_wakeup = pnpacpi_can_wakeup,
221         .suspend = pnpacpi_suspend,
222         .resume = pnpacpi_resume,
223 #endif
224 };
225 EXPORT_SYMBOL(pnpacpi_protocol);
226 
227 static char *__init pnpacpi_get_id(struct acpi_device *device)
228 {
229         struct acpi_hardware_id *id;
230 
231         list_for_each_entry(id, &device->pnp.ids, list) {
232                 if (ispnpidacpi(id->id))
233                         return id->id;
234         }
235 
236         return NULL;
237 }
238 
239 static int __init pnpacpi_add_device(struct acpi_device *device)
240 {
241         struct pnp_dev *dev;
242         char *pnpid;
243         struct acpi_hardware_id *id;
244         int error;
245 
246         /* Skip devices that are already bound */
247         if (device->physical_node_count)
248                 return 0;
249 
250         /*
251          * If a PnPacpi device is not present , the device
252          * driver should not be loaded.
253          */
254         if (!acpi_has_method(device->handle, "_CRS"))
255                 return 0;
256 
257         pnpid = pnpacpi_get_id(device);
258         if (!pnpid)
259                 return 0;
260 
261         if (is_exclusive_device(device) || !device->status.present)
262                 return 0;
263 
264         dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
265         if (!dev)
266                 return -ENOMEM;
267 
268         dev->data = device;
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;
280 
281         if (strlen(acpi_device_name(device)))
282                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
283         else
284                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
285 
286         if (dev->active)
287                 pnpacpi_parse_allocated_resource(dev);
288 
289         if (dev->capabilities & PNP_CONFIGURABLE)
290                 pnpacpi_parse_resource_option_data(dev);
291 
292         list_for_each_entry(id, &device->pnp.ids, list) {
293                 if (!strcmp(id->id, pnpid))
294                         continue;
295                 if (!ispnpidacpi(id->id))
296                         continue;
297                 pnp_add_id(dev, id->id);
298         }
299 
300         /* clear out the damaged flags */
301         if (!dev->active)
302                 pnp_init_resources(dev);
303 
304         error = pnp_add_device(dev);
305         if (error) {
306                 put_device(&dev->dev);
307                 return error;
308         }
309 
310         num++;
311 
312         return 0;
313 }
314 
315 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
316                                                      u32 lvl, void *context,
317                                                      void **rv)
318 {
319         struct acpi_device *device;
320 
321         if (!acpi_bus_get_device(handle, &device))
322                 pnpacpi_add_device(device);
323         else
324                 return AE_CTRL_DEPTH;
325         return AE_OK;
326 }
327 
328 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
329 {
330         struct acpi_device *acpi = to_acpi_device(dev);
331         struct pnp_dev *pnp = _pnp;
332 
333         /* true means it matched */
334         return !acpi->physical_node_count
335             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
336 }
337 
338 static struct acpi_device * __init acpi_pnp_find_companion(struct device *dev)
339 {
340         dev = bus_find_device(&acpi_bus_type, NULL, to_pnp_dev(dev),
341                               acpi_pnp_match);
342         if (!dev)
343                 return NULL;
344 
345         put_device(dev);
346         return to_acpi_device(dev);
347 }
348 
349 /* complete initialization of a PNPACPI device includes having
350  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
351  */
352 static bool acpi_pnp_bus_match(struct device *dev)
353 {
354         return dev->bus == &pnp_bus_type;
355 }
356 
357 static struct acpi_bus_type __initdata acpi_pnp_bus = {
358         .name        = "PNP",
359         .match       = acpi_pnp_bus_match,
360         .find_companion = acpi_pnp_find_companion,
361 };
362 
363 int pnpacpi_disabled __initdata;
364 static int __init pnpacpi_init(void)
365 {
366         if (acpi_disabled || pnpacpi_disabled) {
367                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
368                 return 0;
369         }
370         printk(KERN_INFO "pnp: PnP ACPI init\n");
371         pnp_register_protocol(&pnpacpi_protocol);
372         register_acpi_bus_type(&acpi_pnp_bus);
373         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
374         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
375         unregister_acpi_bus_type(&acpi_pnp_bus);
376         pnp_platform_devices = 1;
377         return 0;
378 }
379 
380 fs_initcall(pnpacpi_init);
381 
382 static int __init pnpacpi_setup(char *str)
383 {
384         if (str == NULL)
385                 return 1;
386         if (!strncmp(str, "off", 3))
387                 pnpacpi_disabled = 1;
388         return 1;
389 }
390 
391 __setup("pnpacpi=", pnpacpi_setup);
392 

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