ACPI : Load device driver according to the status of acpi device
[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 __init 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         dev_dbg(&dev->dev, "get resources\n");
79         return pnpacpi_parse_allocated_resource(dev);
80 }
81
82 static int pnpacpi_set_resources(struct pnp_dev *dev)
83 {
84         acpi_handle handle = dev->data;
85         struct acpi_buffer buffer;
86         int ret;
87         acpi_status status;
88
89         dev_dbg(&dev->dev, "set resources\n");
90         ret = pnpacpi_build_resource_template(dev, &buffer);
91         if (ret)
92                 return ret;
93         ret = pnpacpi_encode_resources(dev, &buffer);
94         if (ret) {
95                 kfree(buffer.pointer);
96                 return ret;
97         }
98         status = acpi_set_current_resources(handle, &buffer);
99         if (ACPI_FAILURE(status))
100                 ret = -EINVAL;
101         kfree(buffer.pointer);
102         return ret;
103 }
104
105 static int pnpacpi_disable_resources(struct pnp_dev *dev)
106 {
107         acpi_status status;
108
109         /* acpi_unregister_gsi(pnp_irq(dev, 0)); */
110         status = acpi_evaluate_object((acpi_handle) dev->data,
111                                       "_DIS", NULL, NULL);
112         return ACPI_FAILURE(status) ? -ENODEV : 0;
113 }
114
115 #ifdef CONFIG_ACPI_SLEEP
116 static int pnpacpi_suspend(struct pnp_dev *dev, pm_message_t state)
117 {
118         int power_state;
119
120         power_state = acpi_pm_device_sleep_state(&dev->dev, NULL);
121         if (power_state < 0)
122                 power_state = (state.event == PM_EVENT_ON) ?
123                                 ACPI_STATE_D0 : ACPI_STATE_D3;
124
125         return acpi_bus_set_power((acpi_handle) dev->data, power_state);
126 }
127
128 static int pnpacpi_resume(struct pnp_dev *dev)
129 {
130         return acpi_bus_set_power((acpi_handle) dev->data, ACPI_STATE_D0);
131 }
132 #endif
133
134 static struct pnp_protocol pnpacpi_protocol = {
135         .name    = "Plug and Play ACPI",
136         .get     = pnpacpi_get_resources,
137         .set     = pnpacpi_set_resources,
138         .disable = pnpacpi_disable_resources,
139 #ifdef CONFIG_ACPI_SLEEP
140         .suspend = pnpacpi_suspend,
141         .resume = pnpacpi_resume,
142 #endif
143 };
144
145 static int __init pnpacpi_add_device(struct acpi_device *device)
146 {
147         acpi_handle temp = NULL;
148         acpi_status status;
149         struct pnp_dev *dev;
150
151         /*
152          * If a PnPacpi device is not present , the device
153          * driver should not be loaded.
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) || (!device->status.present))
158                 return 0;
159
160         dev = pnp_alloc_dev(&pnpacpi_protocol, num, acpi_device_hid(device));
161         if (!dev)
162                 return -ENOMEM;
163
164         dev->data = device->handle;
165         /* .enabled means the device can decode the resources */
166         dev->active = device->status.enabled;
167         status = acpi_get_handle(device->handle, "_SRS", &temp);
168         if (ACPI_SUCCESS(status))
169                 dev->capabilities |= PNP_CONFIGURABLE;
170         dev->capabilities |= PNP_READ;
171         if (device->flags.dynamic_status && (dev->capabilities & PNP_CONFIGURABLE))
172                 dev->capabilities |= PNP_WRITE;
173         if (device->flags.removable)
174                 dev->capabilities |= PNP_REMOVABLE;
175         status = acpi_get_handle(device->handle, "_DIS", &temp);
176         if (ACPI_SUCCESS(status))
177                 dev->capabilities |= PNP_DISABLE;
178
179         if (strlen(acpi_device_name(device)))
180                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
181         else
182                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
183
184         if (dev->active)
185                 pnpacpi_parse_allocated_resource(dev);
186
187         if (dev->capabilities & PNP_CONFIGURABLE)
188                 pnpacpi_parse_resource_option_data(dev);
189
190         if (device->flags.compatible_ids) {
191                 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
192                 int i;
193
194                 for (i = 0; i < cid_list->count; i++) {
195                         if (!ispnpidacpi(cid_list->id[i].value))
196                                 continue;
197                         pnp_add_id(dev, cid_list->id[i].value);
198                 }
199         }
200
201         /* clear out the damaged flags */
202         if (!dev->active)
203                 pnp_init_resources(dev);
204         pnp_add_device(dev);
205         num++;
206
207         return AE_OK;
208 }
209
210 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
211                                                      u32 lvl, void *context,
212                                                      void **rv)
213 {
214         struct acpi_device *device;
215
216         if (!acpi_bus_get_device(handle, &device))
217                 pnpacpi_add_device(device);
218         else
219                 return AE_CTRL_DEPTH;
220         return AE_OK;
221 }
222
223 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
224 {
225         struct acpi_device *acpi = to_acpi_device(dev);
226         struct pnp_dev *pnp = _pnp;
227
228         /* true means it matched */
229         return acpi->flags.hardware_id
230             && !acpi_get_physical_device(acpi->handle)
231             && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
232 }
233
234 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle * handle)
235 {
236         struct device *adev;
237         struct acpi_device *acpi;
238
239         adev = bus_find_device(&acpi_bus_type, NULL,
240                                to_pnp_dev(dev), acpi_pnp_match);
241         if (!adev)
242                 return -ENODEV;
243
244         acpi = to_acpi_device(adev);
245         *handle = acpi->handle;
246         put_device(adev);
247         return 0;
248 }
249
250 /* complete initialization of a PNPACPI device includes having
251  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
252  */
253 static struct acpi_bus_type __initdata acpi_pnp_bus = {
254         .bus         = &pnp_bus_type,
255         .find_device = acpi_pnp_find_device,
256 };
257
258 int pnpacpi_disabled __initdata;
259 static int __init pnpacpi_init(void)
260 {
261         if (acpi_disabled || pnpacpi_disabled) {
262                 pnp_info("PnP ACPI: disabled");
263                 return 0;
264         }
265         pnp_info("PnP ACPI init");
266         pnp_register_protocol(&pnpacpi_protocol);
267         register_acpi_bus_type(&acpi_pnp_bus);
268         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
269         pnp_info("PnP ACPI: found %d devices", num);
270         unregister_acpi_bus_type(&acpi_pnp_bus);
271         pnp_platform_devices = 1;
272         return 0;
273 }
274
275 subsys_initcall(pnpacpi_init);
276
277 static int __init pnpacpi_setup(char *str)
278 {
279         if (str == NULL)
280                 return 1;
281         if (!strncmp(str, "off", 3))
282                 pnpacpi_disabled = 1;
283         return 1;
284 }
285
286 __setup("pnpacpi=", pnpacpi_setup);