c283a9a70d8321063d92bd4a3c40607255f4459d
[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/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 acpi_device_id excluded_id_list[] __initdata = {
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         int power_state;
134
135         power_state = acpi_pm_device_sleep_state(&dev->dev,
136                                                 device_may_wakeup(&dev->dev),
137                                                 NULL);
138         if (power_state < 0)
139                 power_state = (state.event == PM_EVENT_ON) ?
140                                 ACPI_STATE_D0 : ACPI_STATE_D3;
141
142         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
143 }
144
145 static int pnpacpi_resume(struct pnp_dev *dev)
146 {
147         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
148 }
149 #endif
150
151 static struct pnp_protocol pnpacpi_protocol = {
152         .name    = "Plug and Play ACPI",
153         .get     = pnpacpi_get_resources,
154         .set     = pnpacpi_set_resources,
155         .disable = pnpacpi_disable_resources,
156 #ifdef CONFIG_ACPI_SLEEP
157         .suspend = pnpacpi_suspend,
158         .resume = pnpacpi_resume,
159 #endif
160 };
161
162 static int __init pnpacpi_add_device(struct acpi_device *device)
163 {
164         acpi_handle temp = NULL;
165         acpi_status status;
166         struct pnp_id *dev_id;
167         struct pnp_dev *dev;
168
169         status = acpi_get_handle(device->handle, "_CRS", &temp);
170         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
171             is_exclusive_device(device))
172                 return 0;
173
174         dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
175         if (!dev) {
176                 pnp_err("Out of memory");
177                 return -ENOMEM;
178         }
179         dev->data = device->handle;
180         /* .enabled means the device can decode the resources */
181         dev->active = device->status.enabled;
182         status = acpi_get_handle(device->handle, "_SRS", &temp);
183         if (ACPI_SUCCESS(status))
184                 dev->capabilities |= PNP_CONFIGURABLE;
185         dev->capabilities |= PNP_READ;
186         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
187                 dev->capabilities |= PNP_WRITE;
188         if (device->flags.removable)
189                 dev->capabilities |= PNP_REMOVABLE;
190         status = acpi_get_handle(device->handle, "_DIS", &temp);
191         if (ACPI_SUCCESS(status))
192                 dev->capabilities |= PNP_DISABLE;
193
194         dev->protocol = &pnpacpi_protocol;
195
196         if (strlen(acpi_device_name(device)))
197                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
198         else
199                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
200
201         dev->number = num;
202
203         /* set the initial values for the PnP device */
204         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
205         if (!dev_id)
206                 goto err;
207         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
208         pnp_add_id(dev_id, dev);
209
210         if (dev->active) {
211                 /* parse allocated resource */
212                 status = pnpacpi_parse_allocated_resource(device->handle,
213                                                           &dev->res);
214                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
215                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
216                                 dev_id->id);
217                         goto err1;
218                 }
219         }
220
221         if (dev->capabilities & PNP_CONFIGURABLE) {
222                 status = pnpacpi_parse_resource_option_data(device->handle,
223                                                             dev);
224                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
225                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
226                                 dev_id->id);
227                         goto err1;
228                 }
229         }
230
231         /* parse compatible ids */
232         if (device->flags.compatible_ids) {
233                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
234                 int i;
235
236                 for (i = 0; i < cid_list->count; i++) {
237                         if (!ispnpidacpi(cid_list->id[i].value))
238                                 continue;
239                         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
240                         if (!dev_id)
241                                 continue;
242
243                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
244                         pnp_add_id(dev_id, dev);
245                 }
246         }
247
248         /* clear out the damaged flags */
249         if (!dev->active)
250                 pnp_init_resource_table(&dev->res);
251         pnp_add_device(dev);
252         num++;
253
254         return AE_OK;
255 err1:
256         kfree(dev_id);
257 err:
258         kfree(dev);
259         return -EINVAL;
260 }
261
262 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
263                                                      u32 lvl, void *context,
264                                                      void **rv)
265 {
266         struct acpi_device *device;
267
268         if (!acpi_bus_get_device(handle, &device))
269                 pnpacpi_add_device(device);
270         else
271                 return AE_CTRL_DEPTH;
272         return AE_OK;
273 }
274
275 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
276 {
277         struct acpi_device *acpi = to_acpi_device(dev);
278         struct pnp_dev *pnp = _pnp;
279
280         /* true means it matched */
281         return acpi->flags.hardware_id
282             && !acpi_get_physical_device(acpi->handle)
283             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
284 }
285
286 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
287 {
288         struct device *adev;
289         struct acpi_device *acpi;
290
291         adev = bus_find_device(&acpi_bus_type, NULL,
292                                to_pnp_dev(dev), acpi_pnp_match);
293         if (!adev)
294                 return -ENODEV;
295
296         acpi = to_acpi_device(adev);
297         *handle = acpi->handle;
298         put_device(adev);
299         return 0;
300 }
301
302 /* complete initialization of a PNPACPI device includes having
303  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
304  */
305 static struct acpi_bus_type __initdata acpi_pnp_bus = {
306         .bus         = &pnp_bus_type,
307         .find_device = acpi_pnp_find_device,
308 };
309
310 int pnpacpi_disabled __initdata;
311 static int __init pnpacpi_init(void)
312 {
313         if (acpi_disabled || pnpacpi_disabled) {
314                 pnp_info("PnP ACPI: disabled");
315                 return 0;
316         }
317         pnp_info("PnP ACPI init");
318         pnp_register_protocol(&pnpacpi_protocol);
319         register_acpi_bus_type(&acpi_pnp_bus);
320         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
321         pnp_info("PnP ACPI: found %d devices", num);
322         unregister_acpi_bus_type(&acpi_pnp_bus);
323         pnp_platform_devices = 1;
324         return 0;
325 }
326
327 subsys_initcall(pnpacpi_init);
328
329 static int __init pnpacpi_setup(char *str)
330 {
331         if (str == NULL)
332                 return 1;
333         if (!strncmp(str, "off", 3))
334                 pnpacpi_disabled = 1;
335         return 1;
336 }
337
338 __setup("pnpacpi=", pnpacpi_setup);