]> nv-tegra.nvidia Code Review - linux-2.6.git/blob - drivers/pnp/pnpacpi/core.c
ACPI: autoload modules - Create ACPI alias 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 "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 struct pnp_protocol pnpacpi_protocol = {
128         .name   = "Plug and Play ACPI",
129         .get    = pnpacpi_get_resources,
130         .set    = pnpacpi_set_resources,
131         .disable = pnpacpi_disable_resources,
132 };
133
134 static int __init pnpacpi_add_device(struct acpi_device *device)
135 {
136         acpi_handle temp = NULL;
137         acpi_status status;
138         struct pnp_id *dev_id;
139         struct pnp_dev *dev;
140
141         status = acpi_get_handle(device->handle, "_CRS", &temp);
142         if (ACPI_FAILURE(status) || !ispnpidacpi(acpi_device_hid(device)) ||
143                 is_exclusive_device(device))
144                 return 0;
145
146         pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
147         dev =  kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
148         if (!dev) {
149                 pnp_err("Out of memory");
150                 return -ENOMEM;
151         }
152         dev->data = device->handle;
153         /* .enabled means if the device can decode the resources */
154         dev->active = device->status.enabled;
155         status = acpi_get_handle(device->handle, "_SRS", &temp);
156         if (ACPI_SUCCESS(status))
157                 dev->capabilities |= PNP_CONFIGURABLE;
158         dev->capabilities |= PNP_READ;
159         if (device->flags.dynamic_status)
160                 dev->capabilities |= PNP_WRITE;
161         if (device->flags.removable)
162                 dev->capabilities |= PNP_REMOVABLE;
163         status = acpi_get_handle(device->handle, "_DIS", &temp);
164         if (ACPI_SUCCESS(status))
165                 dev->capabilities |= PNP_DISABLE;
166
167         dev->protocol = &pnpacpi_protocol;
168
169         if (strlen(acpi_device_name(device)))
170                 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
171         else
172                 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
173
174         dev->number = num;
175
176         /* set the initial values for the PnP device */
177         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
178         if (!dev_id)
179                 goto err;
180         pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
181         pnp_add_id(dev_id, dev);
182
183         if(dev->active) {
184                 /* parse allocated resource */
185                 status = pnpacpi_parse_allocated_resource(device->handle, &dev->res);
186                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
187                         pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s", dev_id->id);
188                         goto err1;
189                 }
190         }
191
192         if(dev->capabilities & PNP_CONFIGURABLE) {
193                 status = pnpacpi_parse_resource_option_data(device->handle,
194                         dev);
195                 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
196                         pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", dev_id->id);
197                         goto err1;
198                 }
199         }
200
201         /* parse compatible ids */
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                         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
210                         if (!dev_id)
211                                 continue;
212
213                         pnpidacpi_to_pnpid(cid_list->id[i].value, dev_id->id);
214                         pnp_add_id(dev_id, dev);
215                 }
216         }
217
218         /* clear out the damaged flags */
219         if (!dev->active)
220                 pnp_init_resource_table(&dev->res);
221         pnp_add_device(dev);
222         num ++;
223
224         return AE_OK;
225 err1:
226         kfree(dev_id);
227 err:
228         kfree(dev);
229         return -EINVAL;
230 }
231
232 static acpi_status __init pnpacpi_add_device_handler(acpi_handle handle,
233         u32 lvl, void *context, void **rv)
234 {
235         struct acpi_device *device;
236
237         if (!acpi_bus_get_device(handle, &device))
238                 pnpacpi_add_device(device);
239         else
240                 return AE_CTRL_DEPTH;
241         return AE_OK;
242 }
243
244 static int __init acpi_pnp_match(struct device *dev, void *_pnp)
245 {
246         struct acpi_device      *acpi = to_acpi_device(dev);
247         struct pnp_dev          *pnp = _pnp;
248
249         /* true means it matched */
250         return acpi->flags.hardware_id
251                 && !acpi_get_physical_device(acpi->handle)
252                 && compare_pnp_id(pnp->id, acpi->pnp.hardware_id);
253 }
254
255 static int __init acpi_pnp_find_device(struct device *dev, acpi_handle *handle)
256 {
257         struct device           *adev;
258         struct acpi_device      *acpi;
259
260         adev = bus_find_device(&acpi_bus_type, NULL,
261                         to_pnp_dev(dev),
262                         acpi_pnp_match);
263         if (!adev)
264                 return -ENODEV;
265
266         acpi = to_acpi_device(adev);
267         *handle = acpi->handle;
268         put_device(adev);
269         return 0;
270 }
271
272 /* complete initialization of a PNPACPI device includes having
273  * pnpdev->dev.archdata.acpi_handle point to its ACPI sibling.
274  */
275 static struct acpi_bus_type __initdata acpi_pnp_bus = {
276         .bus = &pnp_bus_type,
277         .find_device = acpi_pnp_find_device,
278 };
279
280 int pnpacpi_disabled __initdata;
281 static int __init pnpacpi_init(void)
282 {
283         if (acpi_disabled || pnpacpi_disabled) {
284                 pnp_info("PnP ACPI: disabled");
285                 return 0;
286         }
287         pnp_info("PnP ACPI init");
288         pnp_register_protocol(&pnpacpi_protocol);
289         register_acpi_bus_type(&acpi_pnp_bus);
290         acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
291         pnp_info("PnP ACPI: found %d devices", num);
292         unregister_acpi_bus_type(&acpi_pnp_bus);
293         pnp_platform_devices = 1;
294         return 0;
295 }
296 subsys_initcall(pnpacpi_init);
297
298 static int __init pnpacpi_setup(char *str)
299 {
300         if (str == NULL)
301                 return 1;
302         if (!strncmp(str, "off", 3))
303                 pnpacpi_disabled = 1;
304         return 1;
305 }
306 __setup("pnpacpi=", pnpacpi_setup);
307
308 #if 0
309 EXPORT_SYMBOL(pnpacpi_protocol);
310 #endif