2d73dfcecdbb4e2098e3d881a6a091a9e8ca5e62
[linux-2.6.git] / 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/acpi.h>
23 #include <linux/pnp.h>
24 #include <linux/slab.h>
25 #include <linux/mod_devicetable.h>
26 #include <acpi/acpi_bus.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 (!(('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)
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 = dev->data;
85         acpi_handle handle = acpi_dev->handle;
86         struct acpi_buffer buffer;
87         int ret;
88
89         pnp_dbg(&dev->dev, "set resources\n");
90         ret = pnpacpi_build_resource_template(dev, &buffer);
91         if (ret)
92                 return ret;
93         ret = pnpacpi_encode_resources(dev, &buffer);
94         if (ret) {
95                 kfree(buffer.pointer);
96                 return ret;
97         }
98         if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
99                 ret = -EINVAL;
100         else if (acpi_bus_power_manageable(handle))
101                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
102         kfree(buffer.pointer);
103         return ret;
104 }
105
106 static int pnpacpi_disable_resources(struct pnp_dev *dev)
107 {
108         struct acpi_device *acpi_dev = dev->data;
109         acpi_handle handle = acpi_dev->handle;
110         int ret;
111
112         dev_dbg(&dev->dev, "disable resources\n");
113
114         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
115         ret = 0;
116         if (acpi_bus_power_manageable(handle))
117                 acpi_bus_set_power(handle, ACPI_STATE_D3);
118                 /* continue even if acpi_bus_set_power() fails */
119         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
120                 ret = -ENODEV;
121         return ret;
122 }
123
124 #ifdef CONFIG_ACPI_SLEEP
125 static bool pnpacpi_can_wakeup(struct pnp_dev *dev)
126 {
127         struct acpi_device *acpi_dev = dev->data;
128         acpi_handle handle = acpi_dev->handle;
129
130         return acpi_bus_can_wakeup(handle);
131 }
132
133 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
134 {
135         struct acpi_device *acpi_dev = dev->data;
136         acpi_handle handle = acpi_dev->handle;
137         int power_state;
138
139         if (device_can_wakeup(&dev->dev)) {
140                 int rc = acpi_pm_device_sleep_wake(&dev->dev,
141                                 device_may_wakeup(&dev->dev));
142
143                 if (rc)
144                         return rc;
145         }
146         power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
147         if (power_state < 0)
148                 power_state = (state.event == PM_EVENT_ON) ?
149                                 ACPI_STATE_D0 : ACPI_STATE_D3;
150
151         /* acpi_bus_set_power() often fails (keyboard port can't be
152          * powered-down?), and in any case, our return value is ignored
153          * by pnp_bus_suspend().  Hence we don't revert the wakeup
154          * setting if the set_power fails.
155          */
156         return acpi_bus_set_power(handle, power_state);
157 }
158
159 static int pnpacpi_resume(struct pnp_dev *dev)
160 {
161         struct acpi_device *acpi_dev = dev->data;
162         acpi_handle handle = acpi_dev->handle;
163
164         if (device_may_wakeup(&dev->dev))
165                 acpi_pm_device_sleep_wake(&dev->dev, false);
166         return acpi_bus_set_power(handle, ACPI_STATE_D0);
167 }
168 #endif
169
170 struct pnp_protocol pnpacpi_protocol = {
171         .name    = "Plug and Play ACPI",
172         .get     = pnpacpi_get_resources,
173         .set     = pnpacpi_set_resources,
174         .disable = pnpacpi_disable_resources,
175 #ifdef CONFIG_ACPI_SLEEP
176         .can_wakeup = pnpacpi_can_wakeup,
177         .suspend = pnpacpi_suspend,
178         .resume = pnpacpi_resume,
179 #endif
180 };
181 EXPORT_SYMBOL(pnpacpi_protocol);
182
183 static char *pnpacpi_get_id(struct acpi_device *device)
184 {
185         struct acpi_hardware_id *id;
186
187         list_for_each_entry(id, &device->pnp.ids, list) {
188                 if (ispnpidacpi(id->id))
189                         return id->id;
190         }
191
192         return NULL;
193 }
194
195 static int __init pnpacpi_add_device(struct acpi_device *device)
196 {
197         acpi_handle temp = NULL;
198         acpi_status status;
199         struct pnp_dev *dev;
200         char *pnpid;
201         struct acpi_hardware_id *id;
202
203         /*
204          * If a PnPacpi device is not present , the device
205          * driver should not be loaded.
206          */
207         status = acpi_get_handle(device->handle, "_CRS", &temp);
208         if (ACPI_FAILURE(status))
209                 return 0;
210
211         pnpid = pnpacpi_get_id(device);
212         if (!pnpid)
213                 return 0;
214
215         if (is_exclusive_device(device) || !device->status.present)
216                 return 0;
217
218         dev = pnp_alloc_dev(&pnpacpi_protocol, num, pnpid);
219         if (!dev)
220                 return -ENOMEM;
221
222         dev->data = device;
223         /* .enabled means the device can decode the resources */
224         dev->active = device->status.enabled;
225         status = acpi_get_handle(device->handle, "_SRS", &temp);
226         if (ACPI_SUCCESS(status))
227                 dev->capabilities |= PNP_CONFIGURABLE;
228         dev->capabilities |= PNP_READ;
229         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
230                 dev->capabilities |= PNP_WRITE;
231         if (device->flags.removable)
232                 dev->capabilities |= PNP_REMOVABLE;
233         status = acpi_get_handle(device->handle, "_DIS", &temp);
234         if (ACPI_SUCCESS(status))
235                 dev->capabilities |= PNP_DISABLE;
236
237         if (strlen(acpi_device_name(device)))
238                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
239         else
240                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
241
242         if (dev->active)
243                 pnpacpi_parse_allocated_resource(dev);
244
245         if (dev->capabilities & PNP_CONFIGURABLE)
246                 pnpacpi_parse_resource_option_data(dev);
247
248         list_for_each_entry(id, &device->pnp.ids, list) {
249                 if (!strcmp(id->id, pnpid))
250                         continue;
251                 if (!ispnpidacpi(id->id))
252                         continue;
253                 pnp_add_id(dev, id->id);
254         }
255
256         /* clear out the damaged flags */
257         if (!dev->active)
258                 pnp_init_resources(dev);
259         pnp_add_device(dev);
260         num++;
261
262         return AE_OK;
263 }
264
265 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
266                                                      u32 lvl, void *context,
267                                                      void **rv)
268 {
269         struct acpi_device *device;
270
271         if (!acpi_bus_get_device(handle, &device))
272                 pnpacpi_add_device(device);
273         else
274                 return AE_CTRL_DEPTH;
275         return AE_OK;
276 }
277
278 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
279 {
280         struct acpi_device *acpi = to_acpi_device(dev);
281         struct pnp_dev *pnp = _pnp;
282
283         /* true means it matched */
284         return !acpi_get_physical_device(acpi->handle)
285             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
286 }
287
288 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
289 {
290         struct device *adev;
291         struct acpi_device *acpi;
292
293         adev = bus_find_device(&acpi_bus_type, NULL,
294                                to_pnp_dev(dev), acpi_pnp_match);
295         if (!adev)
296                 return -ENODEV;
297
298         acpi = to_acpi_device(adev);
299         *handle = acpi->handle;
300         put_device(adev);
301         return 0;
302 }
303
304 /* complete initialization of a PNPACPI device includes having
305  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
306  */
307 static struct acpi_bus_type __initdata acpi_pnp_bus = {
308         .bus         = &pnp_bus_type,
309         .find_device = acpi_pnp_find_device,
310 };
311
312 int pnpacpi_disabled __initdata;
313 static int __init pnpacpi_init(void)
314 {
315         if (acpi_disabled || pnpacpi_disabled) {
316                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
317                 return 0;
318         }
319         printk(KERN_INFO "pnp: PnP ACPI init\n");
320         pnp_register_protocol(&pnpacpi_protocol);
321         register_acpi_bus_type(&acpi_pnp_bus);
322         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
323         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
324         unregister_acpi_bus_type(&acpi_pnp_bus);
325         pnp_platform_devices = 1;
326         return 0;
327 }
328
329 fs_initcall(pnpacpi_init);
330
331 static int __init pnpacpi_setup(char *str)
332 {
333         if (str == NULL)
334                 return 1;
335         if (!strncmp(str, "off", 3))
336                 pnpacpi_disabled = 1;
337         return 1;
338 }
339
340 __setup("pnpacpi=", pnpacpi_setup);