PNP: add pnp_init_resources(struct pnp_dev *) interface
[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 "../base.h"
29 #include "pnpacpi.h"
30
31 static int num = 0;
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 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(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         acpi_status status;
79
80         dev_dbg(&dev->dev, "get resources\n");
81         status = pnpacpi_parse_allocated_resource(dev);
82         return ACPI_FAILURE(status) ? -ENODEV : 0;
83 }
84
85 static int pnpacpi_set_resources(struct pnp_dev *dev)
86 {
87         acpi_handle handle = dev->data;
88         struct acpi_buffer buffer;
89         int ret;
90         acpi_status status;
91
92         dev_dbg(&dev->dev, "set resources\n");
93         ret = pnpacpi_build_resource_template(dev, &buffer);
94         if (ret)
95                 return ret;
96         ret = pnpacpi_encode_resources(dev, &buffer);
97         if (ret) {
98                 kfree(buffer.pointer);
99                 return ret;
100         }
101         status = acpi_set_current_resources(handle, &buffer);
102         if (ACPI_FAILURE(status))
103                 ret = -EINVAL;
104         kfree(buffer.pointer);
105         return ret;
106 }
107
108 static int pnpacpi_disable_resources(struct pnp_dev *dev)
109 {
110         acpi_status status;
111
112         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
113         status = acpi_evaluate_object((acpi_handle) dev->data,
114                                       "_DIS", NULL, NULL);
115         return ACPI_FAILURE(status) ? -ENODEV : 0;
116 }
117
118 #ifdef CONFIG_ACPI_SLEEP
119 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
120 {
121         int power_state;
122
123         power_state = acpi_pm_device_sleep_state(&dev->dev,
124                                                 device_may_wakeup(&dev->dev),
125                                                 NULL);
126         if (power_state < 0)
127                 power_state = (state.event == PM_EVENT_ON) ?
128                                 ACPI_STATE_D0 : ACPI_STATE_D3;
129
130         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
131 }
132
133 static int pnpacpi_resume(struct pnp_dev *dev)
134 {
135         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
136 }
137 #endif
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 #ifdef CONFIG_ACPI_SLEEP
145         .suspend = pnpacpi_suspend,
146         .resume = pnpacpi_resume,
147 #endif
148 };
149
150 static int __init pnpacpi_add_device(struct acpi_device *device)
151 {
152         acpi_handle temp = NULL;
153         acpi_status status;
154         struct pnp_dev *dev;
155
156         status = acpi_get_handle(device->handle, "_CRS", &temp);
157         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
158             is_exclusive_device(device))
159                 return 0;
160
161         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
162         if (!dev)
163                 return -ENOMEM;
164
165         dev->data = device->handle;
166         /* .enabled means the device can decode the resources */
167         dev->active = device->status.enabled;
168         status = acpi_get_handle(device->handle, "_SRS", &temp);
169         if (ACPI_SUCCESS(status))
170                 dev->capabilities |= PNP_CONFIGURABLE;
171         dev->capabilities |= PNP_READ;
172         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
173                 dev->capabilities |= PNP_WRITE;
174         if (device->flags.removable)
175                 dev->capabilities |= PNP_REMOVABLE;
176         status = acpi_get_handle(device->handle, "_DIS", &temp);
177         if (ACPI_SUCCESS(status))
178                 dev->capabilities |= PNP_DISABLE;
179
180         if (strlen(acpi_device_name(device)))
181                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
182         else
183                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
184
185         if (dev->active) {
186                 /* parse allocated resource */
187                 status = pnpacpi_parse_allocated_resource(dev);
188                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
189                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s",
190                                 acpi_device_hid(device));
191                 }
192         }
193
194         if (dev->capabilities & PNP_CONFIGURABLE) {
195                 status = pnpacpi_parse_resource_option_data(dev);
196                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
197                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s",
198                                 acpi_device_hid(device));
199                 }
200         }
201
202         if (device->flags.compatible_ids) {
203                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
204                 int i;
205
206                 for (i = 0; i < cid_list->count; i++) {
207                         if (!ispnpidacpi(cid_list->id[i].value))
208                                 continue;
209                         pnp_add_id(dev, cid_list->id[i].value);
210                 }
211         }
212
213         /* clear out the damaged flags */
214         if (!dev->active)
215                 pnp_init_resources(dev);
216         pnp_add_device(dev);
217         num++;
218
219         return AE_OK;
220 }
221
222 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
223                                                      u32 lvl, void *context,
224                                                      void **rv)
225 {
226         struct acpi_device *device;
227
228         if (!acpi_bus_get_device(handle, &device))
229                 pnpacpi_add_device(device);
230         else
231                 return AE_CTRL_DEPTH;
232         return AE_OK;
233 }
234
235 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
236 {
237         struct acpi_device *acpi = to_acpi_device(dev);
238         struct pnp_dev *pnp = _pnp;
239
240         /* true means it matched */
241         return acpi->flags.hardware_id
242             && !acpi_get_physical_device(acpi->handle)
243             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
244 }
245
246 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
247 {
248         struct device *adev;
249         struct acpi_device *acpi;
250
251         adev = bus_find_device(&acpi_bus_type, NULL,
252                                to_pnp_dev(dev), acpi_pnp_match);
253         if (!adev)
254                 return -ENODEV;
255
256         acpi = to_acpi_device(adev);
257         *handle = acpi->handle;
258         put_device(adev);
259         return 0;
260 }
261
262 /* complete initialization of a PNPACPI device includes having
263  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
264  */
265 static struct acpi_bus_type __initdata acpi_pnp_bus = {
266         .bus         = &pnp_bus_type,
267         .find_device = acpi_pnp_find_device,
268 };
269
270 int pnpacpi_disabled __initdata;
271 static int __init pnpacpi_init(void)
272 {
273         if (acpi_disabled || pnpacpi_disabled) {
274                 pnp_info("PnP ACPI: disabled");
275                 return 0;
276         }
277         pnp_info("PnP ACPI init");
278         pnp_register_protocol(&pnpacpi_protocol);
279         register_acpi_bus_type(&acpi_pnp_bus);
280         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
281         pnp_info("PnP ACPI: found %d devices", num);
282         unregister_acpi_bus_type(&acpi_pnp_bus);
283         pnp_platform_devices = 1;
284         return 0;
285 }
286
287 subsys_initcall(pnpacpi_init);
288
289 static int __init pnpacpi_setup(char *str)
290 {
291         if (str == NULL)
292                 return 1;
293         if (!strncmp(str, "off", 3))
294                 pnpacpi_disabled = 1;
295         return 1;
296 }
297
298 __setup("pnpacpi=", pnpacpi_setup);