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1 | /* |
2 | * driver.c - device id matching, driver model, etc. |
3 | * |
4 | * Copyright 2002 Adam Belay <ambx1@neo.rr.com> |
5 | */ |
6 | |
7 | #include <linux/string.h> |
8 | #include <linux/list.h> |
9 | #include <linux/module.h> |
10 | #include <linux/ctype.h> |
11 | #include <linux/slab.h> |
12 | #include <linux/pnp.h> |
13 | #include "base.h" |
14 | |
15 | static int compare_func(const char *ida, const char *idb) |
16 | { |
17 | int i; |
18 | |
19 | /* we only need to compare the last 4 chars */ |
20 | for (i = 3; i < 7; i++) { |
21 | if (ida[i] != 'X' && |
22 | idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i])) |
23 | return 0; |
24 | } |
25 | return 1; |
26 | } |
27 | |
28 | int compare_pnp_id(struct pnp_id *pos, const char *id) |
29 | { |
30 | if (!pos || !id || (strlen(id) != 7)) |
31 | return 0; |
32 | if (memcmp(id, "ANYDEVS", 7) == 0) |
33 | return 1; |
34 | while (pos) { |
35 | if (memcmp(pos->id, id, 3) == 0) |
36 | if (compare_func(pos->id, id) == 1) |
37 | return 1; |
38 | pos = pos->next; |
39 | } |
40 | return 0; |
41 | } |
42 | |
43 | static const struct pnp_device_id *match_device(struct pnp_driver *drv, |
44 | struct pnp_dev *dev) |
45 | { |
46 | const struct pnp_device_id *drv_id = drv->id_table; |
47 | |
48 | if (!drv_id) |
49 | return NULL; |
50 | |
51 | while (*drv_id->id) { |
52 | if (compare_pnp_id(dev->id, drv_id->id)) |
53 | return drv_id; |
54 | drv_id++; |
55 | } |
56 | return NULL; |
57 | } |
58 | |
59 | int pnp_device_attach(struct pnp_dev *pnp_dev) |
60 | { |
61 | spin_lock(&pnp_lock); |
62 | if (pnp_dev->status != PNP_READY) { |
63 | spin_unlock(&pnp_lock); |
64 | return -EBUSY; |
65 | } |
66 | pnp_dev->status = PNP_ATTACHED; |
67 | spin_unlock(&pnp_lock); |
68 | return 0; |
69 | } |
70 | |
71 | void pnp_device_detach(struct pnp_dev *pnp_dev) |
72 | { |
73 | spin_lock(&pnp_lock); |
74 | if (pnp_dev->status == PNP_ATTACHED) |
75 | pnp_dev->status = PNP_READY; |
76 | spin_unlock(&pnp_lock); |
77 | pnp_disable_dev(pnp_dev); |
78 | } |
79 | |
80 | static int pnp_device_probe(struct device *dev) |
81 | { |
82 | int error; |
83 | struct pnp_driver *pnp_drv; |
84 | struct pnp_dev *pnp_dev; |
85 | const struct pnp_device_id *dev_id = NULL; |
86 | pnp_dev = to_pnp_dev(dev); |
87 | pnp_drv = to_pnp_driver(dev->driver); |
88 | |
89 | error = pnp_device_attach(pnp_dev); |
90 | if (error < 0) |
91 | return error; |
92 | |
93 | if (pnp_dev->active == 0) { |
94 | if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) { |
95 | error = pnp_activate_dev(pnp_dev); |
96 | if (error < 0) |
97 | return error; |
98 | } |
99 | } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE) |
100 | == PNP_DRIVER_RES_DISABLE) { |
101 | error = pnp_disable_dev(pnp_dev); |
102 | if (error < 0) |
103 | return error; |
104 | } |
105 | error = 0; |
106 | if (pnp_drv->probe) { |
107 | dev_id = match_device(pnp_drv, pnp_dev); |
108 | if (dev_id != NULL) |
109 | error = pnp_drv->probe(pnp_dev, dev_id); |
110 | } |
111 | if (error >= 0) { |
112 | pnp_dev->driver = pnp_drv; |
113 | error = 0; |
114 | } else |
115 | goto fail; |
116 | |
117 | return error; |
118 | |
119 | fail: |
120 | pnp_device_detach(pnp_dev); |
121 | return error; |
122 | } |
123 | |
124 | static int pnp_device_remove(struct device *dev) |
125 | { |
126 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
127 | struct pnp_driver *drv = pnp_dev->driver; |
128 | |
129 | if (drv) { |
130 | if (drv->remove) |
131 | drv->remove(pnp_dev); |
132 | pnp_dev->driver = NULL; |
133 | } |
134 | pnp_device_detach(pnp_dev); |
135 | return 0; |
136 | } |
137 | |
138 | static void pnp_device_shutdown(struct device *dev) |
139 | { |
140 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
141 | struct pnp_driver *drv = pnp_dev->driver; |
142 | |
143 | if (drv && drv->shutdown) |
144 | drv->shutdown(pnp_dev); |
145 | } |
146 | |
147 | static int pnp_bus_match(struct device *dev, struct device_driver *drv) |
148 | { |
149 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
150 | struct pnp_driver *pnp_drv = to_pnp_driver(drv); |
151 | |
152 | if (match_device(pnp_drv, pnp_dev) == NULL) |
153 | return 0; |
154 | return 1; |
155 | } |
156 | |
157 | static int pnp_bus_suspend(struct device *dev, pm_message_t state) |
158 | { |
159 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
160 | struct pnp_driver *pnp_drv = pnp_dev->driver; |
161 | int error; |
162 | |
163 | if (!pnp_drv) |
164 | return 0; |
165 | |
166 | if (pnp_drv->suspend) { |
167 | error = pnp_drv->suspend(pnp_dev, state); |
168 | if (error) |
169 | return error; |
170 | } |
171 | |
172 | if (pnp_can_disable(pnp_dev)) { |
173 | error = pnp_stop_dev(pnp_dev); |
174 | if (error) |
175 | return error; |
176 | } |
177 | |
178 | if (pnp_dev->protocol->suspend) |
179 | pnp_dev->protocol->suspend(pnp_dev, state); |
180 | return 0; |
181 | } |
182 | |
183 | static int pnp_bus_resume(struct device *dev) |
184 | { |
185 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
186 | struct pnp_driver *pnp_drv = pnp_dev->driver; |
187 | int error; |
188 | |
189 | if (!pnp_drv) |
190 | return 0; |
191 | |
192 | if (pnp_dev->protocol->resume) { |
193 | error = pnp_dev->protocol->resume(pnp_dev); |
194 | if (error) |
195 | return error; |
196 | } |
197 | |
198 | if (pnp_can_write(pnp_dev)) { |
199 | error = pnp_start_dev(pnp_dev); |
200 | if (error) |
201 | return error; |
202 | } |
203 | |
204 | if (pnp_drv->resume) { |
205 | error = pnp_drv->resume(pnp_dev); |
206 | if (error) |
207 | return error; |
208 | } |
209 | |
210 | return 0; |
211 | } |
212 | |
213 | struct bus_type pnp_bus_type = { |
214 | .name = "pnp", |
215 | .match = pnp_bus_match, |
216 | .probe = pnp_device_probe, |
217 | .remove = pnp_device_remove, |
218 | .shutdown = pnp_device_shutdown, |
219 | .suspend = pnp_bus_suspend, |
220 | .resume = pnp_bus_resume, |
221 | .dev_attrs = pnp_interface_attrs, |
222 | }; |
223 | |
224 | int pnp_register_driver(struct pnp_driver *drv) |
225 | { |
226 | drv->driver.name = drv->name; |
227 | drv->driver.bus = &pnp_bus_type; |
228 | |
229 | return driver_register(&drv->driver); |
230 | } |
231 | |
232 | void pnp_unregister_driver(struct pnp_driver *drv) |
233 | { |
234 | driver_unregister(&drv->driver); |
235 | } |
236 | |
237 | /** |
238 | * pnp_add_id - adds an EISA id to the specified device |
239 | * @dev: pointer to the desired device |
240 | * @id: pointer to an EISA id string |
241 | */ |
242 | struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id) |
243 | { |
244 | struct pnp_id *dev_id, *ptr; |
245 | |
246 | dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL); |
247 | if (!dev_id) |
248 | return NULL; |
249 | |
250 | dev_id->id[0] = id[0]; |
251 | dev_id->id[1] = id[1]; |
252 | dev_id->id[2] = id[2]; |
253 | dev_id->id[3] = tolower(id[3]); |
254 | dev_id->id[4] = tolower(id[4]); |
255 | dev_id->id[5] = tolower(id[5]); |
256 | dev_id->id[6] = tolower(id[6]); |
257 | dev_id->id[7] = '\0'; |
258 | |
259 | dev_id->next = NULL; |
260 | ptr = dev->id; |
261 | while (ptr && ptr->next) |
262 | ptr = ptr->next; |
263 | if (ptr) |
264 | ptr->next = dev_id; |
265 | else |
266 | dev->id = dev_id; |
267 | |
268 | return dev_id; |
269 | } |
270 | |
271 | EXPORT_SYMBOL(pnp_register_driver); |
272 | EXPORT_SYMBOL(pnp_unregister_driver); |
273 | EXPORT_SYMBOL(pnp_device_attach); |
274 | EXPORT_SYMBOL(pnp_device_detach); |
275 |
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