ACPI: maintain a single list of _HID and _CID IDs
[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
27 #include "../base.h"
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 __init 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 int pnpacpi_get_resources(struct pnp_dev *dev)
76 {
77         pnp_dbg(&dev->dev, "get resources\n");
78         return pnpacpi_parse_allocated_resource(dev);
79 }
80
81 static int pnpacpi_set_resources(struct pnp_dev *dev)
82 {
83         acpi_handle handle = dev->data;
84         struct acpi_buffer buffer;
85         int ret;
86
87         pnp_dbg(&dev->dev, "set resources\n");
88         ret = pnpacpi_build_resource_template(dev, &buffer);
89         if (ret)
90                 return ret;
91         ret = pnpacpi_encode_resources(dev, &buffer);
92         if (ret) {
93                 kfree(buffer.pointer);
94                 return ret;
95         }
96         if (ACPI_FAILURE(acpi_set_current_resources(handle, &buffer)))
97                 ret = -EINVAL;
98         else if (acpi_bus_power_manageable(handle))
99                 ret = acpi_bus_set_power(handle, ACPI_STATE_D0);
100         kfree(buffer.pointer);
101         return ret;
102 }
103
104 static int pnpacpi_disable_resources(struct pnp_dev *dev)
105 {
106         acpi_handle handle = dev->data;
107         int ret;
108
109         dev_dbg(&dev->dev, "disable resources\n");
110
111         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
112         ret = 0;
113         if (acpi_bus_power_manageable(handle))
114                 acpi_bus_set_power(handle, ACPI_STATE_D3);
115                 /* continue even if acpi_bus_set_power() fails */
116         if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DIS", NULL, NULL)))
117                 ret = -ENODEV;
118         return ret;
119 }
120
121 #ifdef CONFIG_ACPI_SLEEP
122 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
123 {
124         int power_state;
125
126         power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
127         if (power_state < 0)
128                 power_state = (state.event == PM_EVENT_ON) ?
129                                 ACPI_STATE_D0 : ACPI_STATE_D3;
130
131         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
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 #endif
139
140 static struct pnp_protocol pnpacpi_protocol = {
141         .name    = "Plug and Play ACPI",
142         .get     = pnpacpi_get_resources,
143         .set     = pnpacpi_set_resources,
144         .disable = pnpacpi_disable_resources,
145 #ifdef CONFIG_ACPI_SLEEP
146         .suspend = pnpacpi_suspend,
147         .resume = pnpacpi_resume,
148 #endif
149 };
150
151 static int __init pnpacpi_add_device(struct acpi_device *device)
152 {
153         acpi_handle temp = NULL;
154         acpi_status status;
155         struct pnp_dev *dev;
156         struct acpi_hardware_id *id;
157
158         /*
159          * If a PnPacpi device is not present , the device
160          * driver should not be loaded.
161          */
162         status = acpi_get_handle(device->handle, "_CRS", &temp);
163         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
164             is_exclusive_device(device) || (!device->status.present))
165                 return 0;
166
167         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
168         if (!dev)
169                 return -ENOMEM;
170
171         dev->data = device->handle;
172         /* .enabled means the device can decode the resources */
173         dev->active = device->status.enabled;
174         status = acpi_get_handle(device->handle, "_SRS", &temp);
175         if (ACPI_SUCCESS(status))
176                 dev->capabilities |= PNP_CONFIGURABLE;
177         dev->capabilities |= PNP_READ;
178         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
179                 dev->capabilities |= PNP_WRITE;
180         if (device->flags.removable)
181                 dev->capabilities |= PNP_REMOVABLE;
182         status = acpi_get_handle(device->handle, "_DIS", &temp);
183         if (ACPI_SUCCESS(status))
184                 dev->capabilities |= PNP_DISABLE;
185
186         if (strlen(acpi_device_name(device)))
187                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
188         else
189                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
190
191         if (dev->active)
192                 pnpacpi_parse_allocated_resource(dev);
193
194         if (dev->capabilities & PNP_CONFIGURABLE)
195                 pnpacpi_parse_resource_option_data(dev);
196
197         list_for_each_entry(id, &device->pnp.ids, list) {
198                 if (!strcmp(id->id, acpi_device_hid(device)))
199                         continue;
200                 if (!ispnpidacpi(id->id))
201                         continue;
202                 pnp_add_id(dev, id->id);
203         }
204
205         /* clear out the damaged flags */
206         if (!dev->active)
207                 pnp_init_resources(dev);
208         pnp_add_device(dev);
209         num++;
210
211         return AE_OK;
212 }
213
214 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
215                                                      u32 lvl, void *context,
216                                                      void **rv)
217 {
218         struct acpi_device *device;
219
220         if (!acpi_bus_get_device(handle, &device))
221                 pnpacpi_add_device(device);
222         else
223                 return AE_CTRL_DEPTH;
224         return AE_OK;
225 }
226
227 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
228 {
229         struct acpi_device *acpi = to_acpi_device(dev);
230         struct pnp_dev *pnp = _pnp;
231
232         /* true means it matched */
233         return acpi->flags.hardware_id
234             && !acpi_get_physical_device(acpi->handle)
235             && compare_pnp_id(pnp->id, acpi_device_hid(acpi));
236 }
237
238 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
239 {
240         struct device *adev;
241         struct acpi_device *acpi;
242
243         adev = bus_find_device(&acpi_bus_type, NULL,
244                                to_pnp_dev(dev), acpi_pnp_match);
245         if (!adev)
246                 return -ENODEV;
247
248         acpi = to_acpi_device(adev);
249         *handle = acpi->handle;
250         put_device(adev);
251         return 0;
252 }
253
254 /* complete initialization of a PNPACPI device includes having
255  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
256  */
257 static struct acpi_bus_type __initdata acpi_pnp_bus = {
258         .bus         = &pnp_bus_type,
259         .find_device = acpi_pnp_find_device,
260 };
261
262 int pnpacpi_disabled __initdata;
263 static int __init pnpacpi_init(void)
264 {
265         if (acpi_disabled || pnpacpi_disabled) {
266                 printk(KERN_INFO "pnp: PnP ACPI: disabled\n");
267                 return 0;
268         }
269         printk(KERN_INFO "pnp: PnP ACPI init\n");
270         pnp_register_protocol(&pnpacpi_protocol);
271         register_acpi_bus_type(&acpi_pnp_bus);
272         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
273         printk(KERN_INFO "pnp: PnP ACPI: found %d devices\n", num);
274         unregister_acpi_bus_type(&acpi_pnp_bus);
275         pnp_platform_devices = 1;
276         return 0;
277 }
278
279 fs_initcall(pnpacpi_init);
280
281 static int __init pnpacpi_setup(char *str)
282 {
283         if (str == NULL)
284                 return 1;
285         if (!strncmp(str, "off", 3))
286                 pnpacpi_disabled = 1;
287         return 1;
288 }
289
290 __setup("pnpacpi=", pnpacpi_setup);