Pull auto-load-modules into release branch
[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  * Finaly only devices that have a CRS method need to be in this list.
38  */
39 static __initdata struct 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, struct pnp_resource_table * res)
88 {
89         acpi_status status;
90         status = pnpacpi_parse_allocated_resource((acpi_handle)dev->data,
91                 &dev->res);
92         return ACPI_FAILURE(status) ? -ENODEV : 0;
93 }
94
95 static int pnpacpi_set_resources(struct pnp_dev * dev, struct pnp_resource_table * res)
96 {
97         acpi_handle handle = dev->data;
98         struct acpi_buffer buffer;
99         int ret = 0;
100         acpi_status status;
101
102         ret = pnpacpi_build_resource_template(handle, &buffer);
103         if (ret)
104                 return ret;
105         ret = pnpacpi_encode_resources(res, &buffer);
106         if (ret) {
107                 kfree(buffer.pointer);
108                 return ret;
109         }
110         status = acpi_set_current_resources(handle, &buffer);
111         if (ACPI_FAILURE(status))
112                 ret = -EINVAL;
113         kfree(buffer.pointer);
114         return ret;
115 }
116
117 static int pnpacpi_disable_resources(struct pnp_dev *dev)
118 {
119         acpi_status status;
120
121         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
122         status = acpi_evaluate_object((acpi_handle)dev->data,
123                 "_DIS", NULL, NULL);
124         return ACPI_FAILURE(status) ? -ENODEV : 0;
125 }
126
127 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
128 {
129         return acpi_bus_set_power((acpi_handle)dev->data,
130                 acpi_pm_device_sleep_state(&dev->dev,
131                 device_may_wakeup(&dev->dev), NULL));
132 }
133
134 static int pnpacpi_resume(struct pnp_dev *dev)
135 {
136         return acpi_bus_set_power((acpi_handle)dev->data, ACPI_STATE_D0);
137 }
138
139 static struct pnp_protocol pnpacpi_protocol = {
140         .name   = "Plug and Play ACPI",
141         .get    = pnpacpi_get_resources,
142         .set    = pnpacpi_set_resources,
143         .disable = pnpacpi_disable_resources,
144         .suspend = pnpacpi_suspend,
145         .resume = pnpacpi_resume,
146 };
147
148 static int __init pnpacpi_add_device(struct acpi_device *device)
149 {
150         acpi_handle temp = NULL;
151         acpi_status status;
152         struct pnp_id *dev_id;
153         struct pnp_dev *dev;
154
155         status = acpi_get_handle(device->handle, "_CRS", &temp);
156         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
157                 is_exclusive_device(device))
158                 return 0;
159
160         pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
161         dev =  kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
162         if (!dev) {
163                 pnp_err("Out of memory");
164                 return -ENOMEM;
165         }
166         dev->data = device->handle;
167         /* .enabled means if the device can decode the resources */
168         dev->active = device->status.enabled;
169         status = acpi_get_handle(device->handle, "_SRS", &temp);
170         if (ACPI_SUCCESS(status))
171                 dev->capabilities |= PNP_CONFIGURABLE;
172         dev->capabilities |= PNP_READ;
173         if (device->flags.dynamic_status)
174                 dev->capabilities |= PNP_WRITE;
175         if (device->flags.removable)
176                 dev->capabilities |= PNP_REMOVABLE;
177         status = acpi_get_handle(device->handle, "_DIS", &temp);
178         if (ACPI_SUCCESS(status))
179                 dev->capabilities |= PNP_DISABLE;
180
181         dev->protocol = &pnpacpi_protocol;
182
183         if (strlen(acpi_device_name(device)))
184                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
185         else
186                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
187
188         dev->number = num;
189
190         /* set the initial values for the PnP device */
191         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
192         if (!dev_id)
193                 goto err;
194         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
195         pnp_add_id(dev_id, dev);
196
197         if(dev->active) {
198                 /* parse allocated resource */
199                 status = pnpacpi_parse_allocated_resource(device->handle, &dev->res);
200                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
201                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s", dev_id->id);
202                         goto err1;
203                 }
204         }
205
206         if(dev->capabilities & PNP_CONFIGURABLE) {
207                 status = pnpacpi_parse_resource_option_data(device->handle,
208                         dev);
209                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
210                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", dev_id->id);
211                         goto err1;
212                 }
213         }
214
215         /* parse compatible ids */
216         if (device->flags.compatible_ids) {
217                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
218                 int i;
219
220                 for (i = 0; i < cid_list->count; i++) {
221                         if (!ispnpidacpi(cid_list->id[i].value))
222                                 continue;
223                         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
224                         if (!dev_id)
225                                 continue;
226
227                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
228                         pnp_add_id(dev_id, dev);
229                 }
230         }
231
232         /* clear out the damaged flags */
233         if (!dev->active)
234                 pnp_init_resource_table(&dev->res);
235         pnp_add_device(dev);
236         num ++;
237
238         return AE_OK;
239 err1:
240         kfree(dev_id);
241 err:
242         kfree(dev);
243         return -EINVAL;
244 }
245
246 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
247         u32 lvl, void *context, void **rv)
248 {
249         struct acpi_device *device;
250
251         if (!acpi_bus_get_device(handle, &device))
252                 pnpacpi_add_device(device);
253         else
254                 return AE_CTRL_DEPTH;
255         return AE_OK;
256 }
257
258 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
259 {
260         struct acpi_device      *acpi = to_acpi_device(dev);
261         struct pnp_dev          *pnp = _pnp;
262
263         /* true means it matched */
264         return acpi->flags.hardware_id
265                 && !acpi_get_physical_device(acpi->handle)
266                 && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
267 }
268
269 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle *handle)
270 {
271         struct device           *adev;
272         struct acpi_device      *acpi;
273
274         adev = bus_find_device(&acpi_bus_type, NULL,
275                         to_pnp_dev(dev),
276                         acpi_pnp_match);
277         if (!adev)
278                 return -ENODEV;
279
280         acpi = to_acpi_device(adev);
281         *handle = acpi->handle;
282         put_device(adev);
283         return 0;
284 }
285
286 /* complete initialization of a PNPACPI device includes having
287  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
288  */
289 static struct acpi_bus_type __initdata acpi_pnp_bus = {
290         .bus = &pnp_bus_type,
291         .find_device = acpi_pnp_find_device,
292 };
293
294 int pnpacpi_disabled __initdata;
295 static int __init pnpacpi_init(void)
296 {
297         if (acpi_disabled || pnpacpi_disabled) {
298                 pnp_info("PnP ACPI: disabled");
299                 return 0;
300         }
301         pnp_info("PnP ACPI init");
302         pnp_register_protocol(&pnpacpi_protocol);
303         register_acpi_bus_type(&acpi_pnp_bus);
304         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
305         pnp_info("PnP ACPI: found %d devices", num);
306         unregister_acpi_bus_type(&acpi_pnp_bus);
307         pnp_platform_devices = 1;
308         return 0;
309 }
310 subsys_initcall(pnpacpi_init);
311
312 static int __init pnpacpi_setup(char *str)
313 {
314         if (str == NULL)
315                 return 1;
316         if (!strncmp(str, "off", 3))
317                 pnpacpi_disabled = 1;
318         return 1;
319 }
320 __setup("pnpacpi=", pnpacpi_setup);
321
322 #if 0
323 EXPORT_SYMBOL(pnpacpi_protocol);
324 #endif