Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6
[linux-2.6] / 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/mod_devicetable.h>
25 #include <acpi/acpi_bus.h>
26 #include <acpi/actypes.h>
27
28 #include "pnpacpi.h"
29
30 static int num = 0;
31
32 /* We need only to blacklist devices that have already an acpi driver that
33  * can't use pnp layer. We don't need to blacklist device that are directly
34  * used by the kernel (PCI root, ...), as it is harmless and there were
35  * already present in pnpbios. But there is an exception for devices that
36  * have irqs (PIC, Timer) because we call acpi_register_gsi.
37  * Finally, only devices that have a CRS method need to be in this list.
38  */
39 static struct __initdata acpi_device_id excluded_id_list[] = {
40         {"PNP0C09", 0},         /* EC */
41         {"PNP0C0F", 0},         /* Link device */
42         {"PNP0000", 0},         /* PIC */
43         {"PNP0100", 0},         /* Timer */
44         {"", 0},
45 };
46
47 static inline int is_exclusive_device(struct acpi_device *dev)
48 {
49         return (!acpi_match_device_ids(dev, excluded_id_list));
50 }
51
52 /*
53  * Compatible Device IDs
54  */
55 #define TEST_HEX(c) \
56         if (!(('0' <= (c) && (c) <= '9') || ('A' <= (c) && (c) <= 'F'))) \
57                 return 0
58 #define TEST_ALPHA(c) \
59         if (!('@' <= (c) || (c) <= 'Z')) \
60                 return 0
61 static int __init ispnpidacpi(char *id)
62 {
63         TEST_ALPHA(id[0]);
64         TEST_ALPHA(id[1]);
65         TEST_ALPHA(id[2]);
66         TEST_HEX(id[3]);
67         TEST_HEX(id[4]);
68         TEST_HEX(id[5]);
69         TEST_HEX(id[6]);
70         if (id[7] != '\0')
71                 return 0;
72         return 1;
73 }
74
75 static void __init pnpidacpi_to_pnpid(char *id, char *str)
76 {
77         str[0] = id[0];
78         str[1] = id[1];
79         str[2] = id[2];
80         str[3] = tolower(id[3]);
81         str[4] = tolower(id[4]);
82         str[5] = tolower(id[5]);
83         str[6] = tolower(id[6]);
84         str[7] = '\0';
85 }
86
87 static int pnpacpi_get_resources(struct pnp_dev *dev,
88                                  struct pnp_resource_table *res)
89 {
90         acpi_status status;
91
92         status = pnpacpi_parse_allocated_resource((acpi_handle) dev->data,
93                                                   &dev->res);
94         return ACPI_FAILURE(status) ? -ENODEV : 0;
95 }
96
97 static int pnpacpi_set_resources(struct pnp_dev *dev,
98                                  struct pnp_resource_table *res)
99 {
100         acpi_handle handle = dev->data;
101         struct acpi_buffer buffer;
102         int ret = 0;
103         acpi_status status;
104
105         ret = pnpacpi_build_resource_template(handle, &buffer);
106         if (ret)
107                 return ret;
108         ret = pnpacpi_encode_resources(res, &buffer);
109         if (ret) {
110                 kfree(buffer.pointer);
111                 return ret;
112         }
113         status = acpi_set_current_resources(handle, &buffer);
114         if (ACPI_FAILURE(status))
115                 ret = -EINVAL;
116         kfree(buffer.pointer);
117         return ret;
118 }
119
120 static int pnpacpi_disable_resources(struct pnp_dev *dev)
121 {
122         acpi_status status;
123
124         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
125         status = acpi_evaluate_object((acpi_handle) dev->data,
126                                       "_DIS", NULL, NULL);
127         return ACPI_FAILURE(status) ? -ENODEV : 0;
128 }
129
130 #ifdef CONFIG_ACPI_SLEEP
131 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
132 {
133         return acpi_bus_set_power((acpi_handle) dev->data,
134                                   acpi_pm_device_sleep_state(&dev->dev,
135                                                              device_may_wakeup
136                                                              (&dev->dev),
137                                                              NULL));
138 }
139
140 static int pnpacpi_resume(struct pnp_dev *dev)
141 {
142         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
143 }
144 #endif
145
146 static struct pnp_protocol pnpacpi_protocol = {
147         .name    = "Plug and Play ACPI",
148         .get     = pnpacpi_get_resources,
149         .set     = pnpacpi_set_resources,
150         .disable = pnpacpi_disable_resources,
151 #ifdef CONFIG_ACPI_SLEEP
152         .suspend = pnpacpi_suspend,
153         .resume = pnpacpi_resume,
154 #endif
155 };
156
157 static int __init pnpacpi_add_device(struct acpi_device *device)
158 {
159         acpi_handle temp = NULL;
160         acpi_status status;
161         struct pnp_id *dev_id;
162         struct pnp_dev *dev;
163
164         status = acpi_get_handle(device->handle, "_CRS", &temp);
165         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
166             is_exclusive_device(device))
167                 return 0;
168
169         pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
170         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
171         if (!dev) {
172                 pnp_err("Out of memory");
173                 return -ENOMEM;
174         }
175         dev->data = device->handle;
176         /* .enabled means the device can decode the resources */
177         dev->active = device->status.enabled;
178         status = acpi_get_handle(device->handle, "_SRS", &temp);
179         if (ACPI_SUCCESS(status))
180                 dev->capabilities |= PNP_CONFIGURABLE;
181         dev->capabilities |= PNP_READ;
182         if (device->flags.dynamic_status)
183                 dev->capabilities |= PNP_WRITE;
184         if (device->flags.removable)
185                 dev->capabilities |= PNP_REMOVABLE;
186         status = acpi_get_handle(device->handle, "_DIS", &temp);
187         if (ACPI_SUCCESS(status))
188                 dev->capabilities |= PNP_DISABLE;
189
190         dev->protocol = &pnpacpi_protocol;
191
192         if (strlen(acpi_device_name(device)))
193                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
194         else
195                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
196
197         dev->number = num;
198
199         /* set the initial values for the PnP device */
200         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
201         if (!dev_id)
202                 goto err;
203         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
204         pnp_add_id(dev_id, dev);
205
206         if (dev->active) {
207                 /* parse allocated resource */
208                 status = pnpacpi_parse_allocated_resource(device->handle,
209                                                           &dev->res);
210                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
211                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
212                                 dev_id->id);
213                         goto err1;
214                 }
215         }
216
217         if (dev->capabilities & PNP_CONFIGURABLE) {
218                 status = pnpacpi_parse_resource_option_data(device->handle,
219                                                             dev);
220                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
221                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
222                                 dev_id->id);
223                         goto err1;
224                 }
225         }
226
227         /* parse compatible ids */
228         if (device->flags.compatible_ids) {
229                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
230                 int i;
231
232                 for (i = 0; i < cid_list->count; i++) {
233                         if (!ispnpidacpi(cid_list->id[i].value))
234                                 continue;
235                         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
236                         if (!dev_id)
237                                 continue;
238
239                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
240                         pnp_add_id(dev_id, dev);
241                 }
242         }
243
244         /* clear out the damaged flags */
245         if (!dev->active)
246                 pnp_init_resource_table(&dev->res);
247         pnp_add_device(dev);
248         num++;
249
250         return AE_OK;
251 err1:
252         kfree(dev_id);
253 err:
254         kfree(dev);
255         return -EINVAL;
256 }
257
258 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
259                                                      u32 lvl, void *context,
260                                                      void **rv)
261 {
262         struct acpi_device *device;
263
264         if (!acpi_bus_get_device(handle, &device))
265                 pnpacpi_add_device(device);
266         else
267                 return AE_CTRL_DEPTH;
268         return AE_OK;
269 }
270
271 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
272 {
273         struct acpi_device *acpi = to_acpi_device(dev);
274         struct pnp_dev *pnp = _pnp;
275
276         /* true means it matched */
277         return acpi->flags.hardware_id
278             && !acpi_get_physical_device(acpi->handle)
279             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
280 }
281
282 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
283 {
284         struct device *adev;
285         struct acpi_device *acpi;
286
287         adev = bus_find_device(&acpi_bus_type, NULL,
288                                to_pnp_dev(dev), acpi_pnp_match);
289         if (!adev)
290                 return -ENODEV;
291
292         acpi = to_acpi_device(adev);
293         *handle = acpi->handle;
294         put_device(adev);
295         return 0;
296 }
297
298 /* complete initialization of a PNPACPI device includes having
299  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
300  */
301 static struct acpi_bus_type __initdata acpi_pnp_bus = {
302         .bus         = &pnp_bus_type,
303         .find_device = acpi_pnp_find_device,
304 };
305
306 int pnpacpi_disabled __initdata;
307 static int __init pnpacpi_init(void)
308 {
309         if (acpi_disabled || pnpacpi_disabled) {
310                 pnp_info("PnP ACPI: disabled");
311                 return 0;
312         }
313         pnp_info("PnP ACPI init");
314         pnp_register_protocol(&pnpacpi_protocol);
315         register_acpi_bus_type(&acpi_pnp_bus);
316         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
317         pnp_info("PnP ACPI: found %d devices", num);
318         unregister_acpi_bus_type(&acpi_pnp_bus);
319         pnp_platform_devices = 1;
320         return 0;
321 }
322
323 subsys_initcall(pnpacpi_init);
324
325 static int __init pnpacpi_setup(char *str)
326 {
327         if (str == NULL)
328                 return 1;
329         if (!strncmp(str, "off", 3))
330                 pnpacpi_disabled = 1;
331         return 1;
332 }
333
334 __setup("pnpacpi=", pnpacpi_setup);