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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         int ret = 0;
 87 
 88         pnp_dbg(&dev->dev, "set resources\n");
 89 
 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__);
 93                 return -ENODEV;
 94         }
 95 
 96         if (WARN_ON_ONCE(acpi_dev != dev->data))
 97                 dev->data = acpi_dev;
 98 
 99         if (acpi_has_method(handle, METHOD_NAME__SRS)) {
100                 struct acpi_buffer buffer;
101 
102                 ret = pnpacpi_build_resource_template(dev, &buffer);
103                 if (ret)
104                         return ret;
105 
106                 ret = pnpacpi_encode_resources(dev, &buffer);
107                 if (!ret) {
108                         acpi_status status;
109 
110                         status = acpi_set_current_resources(handle, &buffer);
111                         if (ACPI_FAILURE(status))
112                                 ret = -EIO;
113                 }
114                 kfree(buffer.pointer);
115         }
116         if (!ret && acpi_bus_power_manageable(handle))
117                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
118 
119         return ret;
120 }
121 
122 static int pnpacpi_disable_resources(struct pnp_dev *dev)
123 {
124         struct acpi_device *acpi_dev;
125         acpi_handle handle;
126         acpi_status status;
127 
128         dev_dbg(&dev->dev, "disable resources\n");
129 
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__);
133                 return 0;
134         }
135 
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);
139 
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)
143                 return -ENODEV;
144 
145         return 0;
146 }
147 
148 #ifdef CONFIG_ACPI_SLEEP
149 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
150 {
151         struct acpi_device *acpi_dev;
152         acpi_handle handle;
153 
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__);
157                 return false;
158         }
159 
160         return acpi_bus_can_wakeup(handle);
161 }
162 
163 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
164 {
165         struct acpi_device *acpi_dev;
166         acpi_handle handle;
167         int error = 0;
168 
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__);
172                 return 0;
173         }
174 
175         if (device_can_wakeup(&dev->dev)) {
176                 error = acpi_pm_device_sleep_wake(&dev->dev,
177                                 device_may_wakeup(&dev->dev));
178                 if (error)
179                         return error;
180         }
181 
182         if (acpi_bus_power_manageable(handle)) {
183                 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
184                                                         ACPI_STATE_D3_COLD);
185                 if (power_state < 0)
186                         power_state = (state.event == PM_EVENT_ON) ?
187                                         ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
188 
189                 /*
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.
194                  */
195                 error = acpi_bus_set_power(handle, power_state);
196         }
197 
198         return error;
199 }
200 
201 static int pnpacpi_resume(struct pnp_dev *dev)
202 {
203         struct acpi_device *acpi_dev;
204         acpi_handle handle = ACPI_HANDLE(&dev->dev);
205         int error = 0;
206 
207         if (!handle || acpi_bus_get_device(handle, &acpi_dev)) {
208                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
209                 return -ENODEV;
210         }
211 
212         if (device_may_wakeup(&dev->dev))
213                 acpi_pm_device_sleep_wake(&dev->dev, false);
214 
215         if (acpi_bus_power_manageable(handle))
216                 error = acpi_bus_set_power(handle, ACPI_STATE_D0);
217 
218         return error;
219 }
220 #endif
221 
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,
231 #endif
232 };
233 EXPORT_SYMBOL(pnpacpi_protocol);
234 
235 static char *__init pnpacpi_get_id(struct acpi_device *device)
236 {
237         struct acpi_hardware_id *id;
238 
239         list_for_each_entry(id, &device->pnp.ids, list) {
240                 if (ispnpidacpi(id->id))
241                         return id->id;
242         }
243 
244         return NULL;
245 }
246 
247 static int __init pnpacpi_add_device(struct acpi_device *device)
248 {
249         struct pnp_dev *dev;
250         char *pnpid;
251         struct acpi_hardware_id *id;
252         int error;
253 
254         /* Skip devices that are already bound */
255         if (device->physical_node_count)
256                 return 0;
257 
258         /*
259          * If a PnPacpi device is not present , the device
260          * driver should not be loaded.
261          */
262         if (!acpi_has_method(device->handle, "_CRS"))
263                 return 0;
264 
265         pnpid = pnpacpi_get_id(device);
266         if (!pnpid)
267                 return 0;
268 
269         if (is_exclusive_device(device) || !device->status.present)
270                 return 0;
271 
272         dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
273         if (!dev)
274                 return -ENOMEM;
275 
276         dev->data = device;
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;
288 
289         if (strlen(acpi_device_name(device)))
290                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
291         else
292                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
293 
294         if (dev->active)
295                 pnpacpi_parse_allocated_resource(dev);
296 
297         if (dev->capabilities & PNP_CONFIGURABLE)
298                 pnpacpi_parse_resource_option_data(dev);
299 
300         list_for_each_entry(id, &device->pnp.ids, list) {
301                 if (!strcmp(id->id, pnpid))
302                         continue;
303                 if (!ispnpidacpi(id->id))
304                         continue;
305                 pnp_add_id(dev, id->id);
306         }
307 
308         /* clear out the damaged flags */
309         if (!dev->active)
310                 pnp_init_resources(dev);
311 
312         error = pnp_add_device(dev);
313         if (error) {
314                 put_device(&dev->dev);
315                 return error;
316         }
317 
318         num++;
319 
320         return 0;
321 }
322 
323 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
324                                                      u32 lvl, void *context,
325                                                      void **rv)
326 {
327         struct acpi_device *device;
328 
329         if (!acpi_bus_get_device(handle, &device))
330                 pnpacpi_add_device(device);
331         else
332                 return AE_CTRL_DEPTH;
333         return AE_OK;
334 }
335 
336 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
337 {
338         struct acpi_device *acpi = to_acpi_device(dev);
339         struct pnp_dev *pnp = _pnp;
340 
341         /* true means it matched */
342         return !acpi->physical_node_count
343             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
344 }
345 
346 static struct acpi_device * __init acpi_pnp_find_companion(struct device *dev)
347 {
348         dev = bus_find_device(&acpi_bus_type, NULL, to_pnp_dev(dev),
349                               acpi_pnp_match);
350         if (!dev)
351                 return NULL;
352 
353         put_device(dev);
354         return to_acpi_device(dev);
355 }
356 
357 /* complete initialization of a PNPACPI device includes having
358  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
359  */
360 static bool acpi_pnp_bus_match(struct device *dev)
361 {
362         return dev->bus == &pnp_bus_type;
363 }
364 
365 static struct acpi_bus_type __initdata acpi_pnp_bus = {
366         .name        = "PNP",
367         .match       = acpi_pnp_bus_match,
368         .find_companion = acpi_pnp_find_companion,
369 };
370 
371 int pnpacpi_disabled __initdata;
372 static int __init pnpacpi_init(void)
373 {
374         if (acpi_disabled || pnpacpi_disabled) {
375                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
376                 return 0;
377         }
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;
385         return 0;
386 }
387 
388 fs_initcall(pnpacpi_init);
389 
390 static int __init pnpacpi_setup(char *str)
391 {
392         if (str == NULL)
393                 return 1;
394         if (!strncmp(str, "off", 3))
395                 pnpacpi_disabled = 1;
396         return 1;
397 }
398 
399 __setup("pnpacpi=", pnpacpi_setup);
400 

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