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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 /*
 34  * Compatible Device IDs
 35  */
 36 #define TEST_HEX(c) \
 37         if (!(('' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
 38                 return 0
 39 #define TEST_ALPHA(c) \
 40         if (!('A' <= (c) && (c) <= 'Z')) \
 41                 return 0
 42 static int __init ispnpidacpi(const char *id)
 43 {
 44         TEST_ALPHA(id[0]);
 45         TEST_ALPHA(id[1]);
 46         TEST_ALPHA(id[2]);
 47         TEST_HEX(id[3]);
 48         TEST_HEX(id[4]);
 49         TEST_HEX(id[5]);
 50         TEST_HEX(id[6]);
 51         if (id[7] != '\0')
 52                 return 0;
 53         return 1;
 54 }
 55 
 56 static int pnpacpi_get_resources(struct pnp_dev *dev)
 57 {
 58         pnp_dbg(&dev->dev, "get resources\n");
 59         return pnpacpi_parse_allocated_resource(dev);
 60 }
 61 
 62 static int pnpacpi_set_resources(struct pnp_dev *dev)
 63 {
 64         struct acpi_device *acpi_dev;
 65         acpi_handle handle;
 66         int ret = 0;
 67 
 68         pnp_dbg(&dev->dev, "set resources\n");
 69 
 70         acpi_dev = ACPI_COMPANION(&dev->dev);
 71         if (!acpi_dev) {
 72                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
 73                 return -ENODEV;
 74         }
 75 
 76         if (WARN_ON_ONCE(acpi_dev != dev->data))
 77                 dev->data = acpi_dev;
 78 
 79         handle = acpi_dev->handle;
 80         if (acpi_has_method(handle, METHOD_NAME__SRS)) {
 81                 struct acpi_buffer buffer;
 82 
 83                 ret = pnpacpi_build_resource_template(dev, &buffer);
 84                 if (ret)
 85                         return ret;
 86 
 87                 ret = pnpacpi_encode_resources(dev, &buffer);
 88                 if (!ret) {
 89                         acpi_status status;
 90 
 91                         status = acpi_set_current_resources(handle, &buffer);
 92                         if (ACPI_FAILURE(status))
 93                                 ret = -EIO;
 94                 }
 95                 kfree(buffer.pointer);
 96         }
 97         if (!ret && acpi_device_power_manageable(acpi_dev))
 98                 ret = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);
 99 
100         return ret;
101 }
102 
103 static int pnpacpi_disable_resources(struct pnp_dev *dev)
104 {
105         struct acpi_device *acpi_dev;
106         acpi_status status;
107 
108         dev_dbg(&dev->dev, "disable resources\n");
109 
110         acpi_dev = ACPI_COMPANION(&dev->dev);
111         if (!acpi_dev) {
112                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
113                 return 0;
114         }
115 
116         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
117         if (acpi_device_power_manageable(acpi_dev))
118                 acpi_device_set_power(acpi_dev, ACPI_STATE_D3_COLD);
119 
120         /* continue even if acpi_device_set_power() fails */
121         status = acpi_evaluate_object(acpi_dev->handle, "_DIS", NULL, NULL);
122         if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
123                 return -ENODEV;
124 
125         return 0;
126 }
127 
128 #ifdef CONFIG_ACPI_SLEEP
129 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
130 {
131         struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
132 
133         if (!acpi_dev) {
134                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
135                 return false;
136         }
137 
138         return acpi_bus_can_wakeup(acpi_dev->handle);
139 }
140 
141 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
142 {
143         struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
144         int error = 0;
145 
146         if (!acpi_dev) {
147                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
148                 return 0;
149         }
150 
151         if (device_can_wakeup(&dev->dev)) {
152                 error = acpi_pm_device_sleep_wake(&dev->dev,
153                                 device_may_wakeup(&dev->dev));
154                 if (error)
155                         return error;
156         }
157 
158         if (acpi_device_power_manageable(acpi_dev)) {
159                 int power_state = acpi_pm_device_sleep_state(&dev->dev, NULL,
160                                                         ACPI_STATE_D3_COLD);
161                 if (power_state < 0)
162                         power_state = (state.event == PM_EVENT_ON) ?
163                                         ACPI_STATE_D0 : ACPI_STATE_D3_COLD;
164 
165                 /*
166                  * acpi_device_set_power() can fail (keyboard port can't be
167                  * powered-down?), and in any case, our return value is ignored
168                  * by pnp_bus_suspend().  Hence we don't revert the wakeup
169                  * setting if the set_power fails.
170                  */
171                 error = acpi_device_set_power(acpi_dev, power_state);
172         }
173 
174         return error;
175 }
176 
177 static int pnpacpi_resume(struct pnp_dev *dev)
178 {
179         struct acpi_device *acpi_dev = ACPI_COMPANION(&dev->dev);
180         int error = 0;
181 
182         if (!acpi_dev) {
183                 dev_dbg(&dev->dev, "ACPI device not found in %s!\n", __func__);
184                 return -ENODEV;
185         }
186 
187         if (device_may_wakeup(&dev->dev))
188                 acpi_pm_device_sleep_wake(&dev->dev, false);
189 
190         if (acpi_device_power_manageable(acpi_dev))
191                 error = acpi_device_set_power(acpi_dev, ACPI_STATE_D0);
192 
193         return error;
194 }
195 #endif
196 
197 struct pnp_protocol pnpacpi_protocol = {
198         .name    = "Plug and Play ACPI",
199         .get     = pnpacpi_get_resources,
200         .set     = pnpacpi_set_resources,
201         .disable = pnpacpi_disable_resources,
202 #ifdef CONFIG_ACPI_SLEEP
203         .can_wakeup = pnpacpi_can_wakeup,
204         .suspend = pnpacpi_suspend,
205         .resume = pnpacpi_resume,
206 #endif
207 };
208 EXPORT_SYMBOL(pnpacpi_protocol);
209 
210 static char *__init pnpacpi_get_id(struct acpi_device *device)
211 {
212         struct acpi_hardware_id *id;
213 
214         list_for_each_entry(id, &device->pnp.ids, list) {
215                 if (ispnpidacpi(id->id))
216                         return id->id;
217         }
218 
219         return NULL;
220 }
221 
222 static int __init pnpacpi_add_device(struct acpi_device *device)
223 {
224         struct pnp_dev *dev;
225         char *pnpid;
226         struct acpi_hardware_id *id;
227         int error;
228 
229         /* Skip devices that are already bound */
230         if (device->physical_node_count)
231                 return 0;
232 
233         /*
234          * If a PnPacpi device is not present , the device
235          * driver should not be loaded.
236          */
237         if (!acpi_has_method(device->handle, "_CRS"))
238                 return 0;
239 
240         pnpid = pnpacpi_get_id(device);
241         if (!pnpid)
242                 return 0;
243 
244         if (!device->status.present)
245                 return 0;
246 
247         dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
248         if (!dev)
249                 return -ENOMEM;
250 
251         dev->data = device;
252         /* .enabled means the device can decode the resources */
253         dev->active = device->status.enabled;
254         if (acpi_has_method(device->handle, "_SRS"))
255                 dev->capabilities |= PNP_CONFIGURABLE;
256         dev->capabilities |= PNP_READ;
257         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
258                 dev->capabilities |= PNP_WRITE;
259         if (device->flags.removable)
260                 dev->capabilities |= PNP_REMOVABLE;
261         if (acpi_has_method(device->handle, "_DIS"))
262                 dev->capabilities |= PNP_DISABLE;
263 
264         if (strlen(acpi_device_name(device)))
265                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
266         else
267                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
268 
269         if (dev->active)
270                 pnpacpi_parse_allocated_resource(dev);
271 
272         if (dev->capabilities & PNP_CONFIGURABLE)
273                 pnpacpi_parse_resource_option_data(dev);
274 
275         list_for_each_entry(id, &device->pnp.ids, list) {
276                 if (!strcmp(id->id, pnpid))
277                         continue;
278                 if (!ispnpidacpi(id->id))
279                         continue;
280                 pnp_add_id(dev, id->id);
281         }
282 
283         /* clear out the damaged flags */
284         if (!dev->active)
285                 pnp_init_resources(dev);
286 
287         error = pnp_add_device(dev);
288         if (error) {
289                 put_device(&dev->dev);
290                 return error;
291         }
292 
293         error = acpi_bind_one(&dev->dev, device);
294 
295         num++;
296 
297         return error;
298 }
299 
300 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
301                                                      u32 lvl, void *context,
302                                                      void **rv)
303 {
304         struct acpi_device *device;
305 
306         if (acpi_bus_get_device(handle, &device))
307                 return AE_CTRL_DEPTH;
308         if (acpi_is_pnp_device(device))
309                 pnpacpi_add_device(device);
310         return AE_OK;
311 }
312 
313 int pnpacpi_disabled __initdata;
314 static int __init pnpacpi_init(void)
315 {
316         if (acpi_disabled || pnpacpi_disabled) {
317                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
318                 return 0;
319         }
320         printk(KERN_INFO "pnp: PnP ACPI init\n");
321         pnp_register_protocol(&pnpacpi_protocol);
322         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
323         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
324         pnp_platform_devices = 1;
325         return 0;
326 }
327 
328 fs_initcall(pnpacpi_init);
329 
330 static int __init pnpacpi_setup(char *str)
331 {
332         if (str == NULL)
333                 return 1;
334         if (!strncmp(str, "off", 3))
335                 pnpacpi_disabled = 1;
336         return 1;
337 }
338 
339 __setup("pnpacpi=", pnpacpi_setup);
340 

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