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 <acpi/acpi_bus.h>
25 #include "pnpacpi.h"
26
27 static int num = 0;
28
29 static char __initdata excluded_id_list[] =
30 "PNP0C0A," /* Battery */
31 "PNP0C0C,PNP0C0E,PNP0C0D," /* Button */
32 "PNP0C09," /* EC */
33 "PNP0C0B," /* Fan */
34 "PNP0A03," /* PCI root */
35 "PNP0C0F," /* Link device */
36 "PNP0000," /* PIC */
37 "PNP0100," /* Timer */
38 ;
39 static inline int is_exclusive_device(struct acpi_device *dev)
40 {
41 return (!acpi_match_ids(dev, excluded_id_list));
42 }
43
44 void *pnpacpi_kmalloc(size_t size, int f)
45 {
46 void *p = kmalloc(size, f);
47 if (p)
48 memset(p, 0, size);
49 return p;
50 }
51
52 /*
53 * Compatible Device IDs
54 */
55 #define TEST_HEX(c) \
56 if (!(('' <= (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 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 if (!ispnpidacpi(acpi_device_hid(device)) ||
142 is_exclusive_device(device))
143 return 0;
144
145 pnp_dbg("ACPI device : hid %s", acpi_device_hid(device));
146 dev = pnpacpi_kmalloc(sizeof(struct pnp_dev), GFP_KERNEL);
147 if (!dev) {
148 pnp_err("Out of memory");
149 return -ENOMEM;
150 }
151 dev->data = device->handle;
152 /* .enabled means if the device can decode the resources */
153 dev->active = device->status.enabled;
154 status = acpi_get_handle(device->handle, "_SRS", &temp);
155 if (ACPI_SUCCESS(status))
156 dev->capabilities |= PNP_CONFIGURABLE;
157 dev->capabilities |= PNP_READ;
158 if (device->flags.dynamic_status)
159 dev->capabilities |= PNP_WRITE;
160 if (device->flags.removable)
161 dev->capabilities |= PNP_REMOVABLE;
162 status = acpi_get_handle(device->handle, "_DIS", &temp);
163 if (ACPI_SUCCESS(status))
164 dev->capabilities |= PNP_DISABLE;
165
166 dev->protocol = &pnpacpi_protocol;
167
168 if (strlen(acpi_device_name(device)))
169 strncpy(dev->name, acpi_device_name(device), sizeof(dev->name));
170 else
171 strncpy(dev->name, acpi_device_bid(device), sizeof(dev->name));
172
173 dev->number = num;
174
175 /* set the initial values for the PnP device */
176 dev_id = pnpacpi_kmalloc(sizeof(struct pnp_id), GFP_KERNEL);
177 if (!dev_id)
178 goto err;
179 pnpidacpi_to_pnpid(acpi_device_hid(device), dev_id->id);
180 pnp_add_id(dev_id, dev);
181
182 if(dev->active) {
183 /* parse allocated resource */
184 status = pnpacpi_parse_allocated_resource(device->handle, &dev->res);
185 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
186 pnp_err("PnPACPI: METHOD_NAME__CRS failure for %s", dev_id->id);
187 goto err1;
188 }
189 }
190
191 if(dev->capabilities & PNP_CONFIGURABLE) {
192 status = pnpacpi_parse_resource_option_data(device->handle,
193 dev);
194 if (ACPI_FAILURE(status) && (status != AE_NOT_FOUND)) {
195 pnp_err("PnPACPI: METHOD_NAME__PRS failure for %s", dev_id->id);
196 goto err1;
197 }
198 }
199
200 /* parse compatible ids */
201 if (device->flags.compatible_ids) {
202 struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;
203 int i;
204
205 for (i = 0; i < cid_list->count; i++) {
206 if (!ispnpidacpi(cid_list->id[i].value))
207 continue;
208 dev_id = pnpacpi_kmalloc(sizeof(struct pnp_id),
209 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 int pnpacpi_disabled __initdata;
245 int __init pnpacpi_init(void)
246 {
247 if (acpi_disabled || pnpacpi_disabled) {
248 pnp_info("PnP ACPI: disabled");
249 return 0;
250 }
251 pnp_info("PnP ACPI init");
252 pnp_register_protocol(&pnpacpi_protocol);
253 acpi_get_devices(NULL, pnpacpi_add_device_handler, NULL, NULL);
254 pnp_info("PnP ACPI: found %d devices", num);
255 return 0;
256 }
257 subsys_initcall(pnpacpi_init);
258
259 static int __init pnpacpi_setup(char *str)
260 {
261 if (str == NULL)
262 return 1;
263 if (!strncmp(str, "off", 3))
264 pnpacpi_disabled = 1;
265 return 1;
266 }
267 __setup("pnpacpi=", pnpacpi_setup);
268
269 EXPORT_SYMBOL(pnpacpi_protocol);
270
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