Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * driver.c - device id matching, driver model, etc. | |
3 | * | |
4 | * Copyright 2002 Adam Belay <ambx1@neo.rr.com> | |
5 | * | |
6 | */ | |
7 | ||
1da177e4 LT |
8 | #include <linux/string.h> |
9 | #include <linux/list.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/ctype.h> | |
12 | #include <linux/slab.h> | |
1da177e4 LT |
13 | #include <linux/pnp.h> |
14 | #include "base.h" | |
15 | ||
16 | static int compare_func(const char *ida, const char *idb) | |
17 | { | |
18 | int i; | |
19 | /* we only need to compare the last 4 chars */ | |
9dd78466 | 20 | for (i = 3; i < 7; i++) { |
1da177e4 | 21 | if (ida[i] != 'X' && |
9dd78466 | 22 | idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i])) |
1da177e4 LT |
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; | |
9dd78466 | 32 | if (memcmp(id, "ANYDEVS", 7) == 0) |
1da177e4 | 33 | return 1; |
9dd78466 BH |
34 | while (pos) { |
35 | if (memcmp(pos->id, id, 3) == 0) | |
36 | if (compare_func(pos->id, id) == 1) | |
1da177e4 LT |
37 | return 1; |
38 | pos = pos->next; | |
39 | } | |
40 | return 0; | |
41 | } | |
42 | ||
9dd78466 BH |
43 | static const struct pnp_device_id *match_device(struct pnp_driver *drv, |
44 | struct pnp_dev *dev) | |
1da177e4 LT |
45 | { |
46 | const struct pnp_device_id *drv_id = drv->id_table; | |
47 | if (!drv_id) | |
48 | return NULL; | |
49 | ||
50 | while (*drv_id->id) { | |
51 | if (compare_pnp_id(dev->id, drv_id->id)) | |
52 | return drv_id; | |
53 | drv_id++; | |
54 | } | |
55 | return NULL; | |
56 | } | |
57 | ||
58 | int pnp_device_attach(struct pnp_dev *pnp_dev) | |
59 | { | |
60 | spin_lock(&pnp_lock); | |
9dd78466 | 61 | if (pnp_dev->status != PNP_READY) { |
1da177e4 LT |
62 | spin_unlock(&pnp_lock); |
63 | return -EBUSY; | |
64 | } | |
65 | pnp_dev->status = PNP_ATTACHED; | |
66 | spin_unlock(&pnp_lock); | |
67 | return 0; | |
68 | } | |
69 | ||
70 | void pnp_device_detach(struct pnp_dev *pnp_dev) | |
71 | { | |
72 | spin_lock(&pnp_lock); | |
73 | if (pnp_dev->status == PNP_ATTACHED) | |
74 | pnp_dev->status = PNP_READY; | |
75 | spin_unlock(&pnp_lock); | |
76 | pnp_disable_dev(pnp_dev); | |
77 | } | |
78 | ||
79 | static int pnp_device_probe(struct device *dev) | |
80 | { | |
81 | int error; | |
82 | struct pnp_driver *pnp_drv; | |
83 | struct pnp_dev *pnp_dev; | |
84 | const struct pnp_device_id *dev_id = NULL; | |
85 | pnp_dev = to_pnp_dev(dev); | |
86 | pnp_drv = to_pnp_driver(dev->driver); | |
87 | ||
9dd78466 BH |
88 | pnp_dbg("match found with the PnP device '%s' and the driver '%s'", |
89 | dev->bus_id, pnp_drv->name); | |
1da177e4 LT |
90 | |
91 | error = pnp_device_attach(pnp_dev); | |
92 | if (error < 0) | |
93 | return error; | |
94 | ||
95 | if (pnp_dev->active == 0) { | |
96 | if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) { | |
97 | error = pnp_activate_dev(pnp_dev); | |
98 | if (error < 0) | |
99 | return error; | |
100 | } | |
101 | } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE) | |
9dd78466 | 102 | == PNP_DRIVER_RES_DISABLE) { |
1da177e4 LT |
103 | error = pnp_disable_dev(pnp_dev); |
104 | if (error < 0) | |
105 | return error; | |
106 | } | |
107 | error = 0; | |
108 | if (pnp_drv->probe) { | |
109 | dev_id = match_device(pnp_drv, pnp_dev); | |
110 | if (dev_id != NULL) | |
111 | error = pnp_drv->probe(pnp_dev, dev_id); | |
112 | } | |
9dd78466 | 113 | if (error >= 0) { |
1da177e4 LT |
114 | pnp_dev->driver = pnp_drv; |
115 | error = 0; | |
116 | } else | |
117 | goto fail; | |
118 | return error; | |
119 | ||
9dd78466 | 120 | fail: |
1da177e4 LT |
121 | pnp_device_detach(pnp_dev); |
122 | return error; | |
123 | } | |
124 | ||
125 | static int pnp_device_remove(struct device *dev) | |
126 | { | |
9dd78466 BH |
127 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
128 | struct pnp_driver *drv = pnp_dev->driver; | |
1da177e4 LT |
129 | |
130 | if (drv) { | |
131 | if (drv->remove) | |
132 | drv->remove(pnp_dev); | |
133 | pnp_dev->driver = NULL; | |
134 | } | |
135 | pnp_device_detach(pnp_dev); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | static int pnp_bus_match(struct device *dev, struct device_driver *drv) | |
140 | { | |
9dd78466 BH |
141 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
142 | struct pnp_driver *pnp_drv = to_pnp_driver(drv); | |
1da177e4 LT |
143 | if (match_device(pnp_drv, pnp_dev) == NULL) |
144 | return 0; | |
145 | return 1; | |
146 | } | |
147 | ||
4c98cfef TI |
148 | static int pnp_bus_suspend(struct device *dev, pm_message_t state) |
149 | { | |
9dd78466 BH |
150 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
151 | struct pnp_driver *pnp_drv = pnp_dev->driver; | |
68094e32 PO |
152 | int error; |
153 | ||
154 | if (!pnp_drv) | |
155 | return 0; | |
156 | ||
157 | if (pnp_drv->suspend) { | |
158 | error = pnp_drv->suspend(pnp_dev, state); | |
159 | if (error) | |
160 | return error; | |
161 | } | |
162 | ||
163 | if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) && | |
164 | pnp_can_disable(pnp_dev)) { | |
9dd78466 BH |
165 | error = pnp_stop_dev(pnp_dev); |
166 | if (error) | |
167 | return error; | |
68094e32 | 168 | } |
4c98cfef | 169 | |
fc30e68e SL |
170 | if (pnp_dev->protocol && pnp_dev->protocol->suspend) |
171 | pnp_dev->protocol->suspend(pnp_dev, state); | |
4c98cfef TI |
172 | return 0; |
173 | } | |
174 | ||
68094e32 | 175 | static int pnp_bus_resume(struct device *dev) |
4c98cfef | 176 | { |
9dd78466 BH |
177 | struct pnp_dev *pnp_dev = to_pnp_dev(dev); |
178 | struct pnp_driver *pnp_drv = pnp_dev->driver; | |
68094e32 PO |
179 | int error; |
180 | ||
181 | if (!pnp_drv) | |
182 | return 0; | |
183 | ||
fc30e68e SL |
184 | if (pnp_dev->protocol && pnp_dev->protocol->resume) |
185 | pnp_dev->protocol->resume(pnp_dev); | |
186 | ||
68094e32 PO |
187 | if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) { |
188 | error = pnp_start_dev(pnp_dev); | |
189 | if (error) | |
190 | return error; | |
191 | } | |
4c98cfef | 192 | |
68094e32 PO |
193 | if (pnp_drv->resume) |
194 | return pnp_drv->resume(pnp_dev); | |
195 | ||
196 | return 0; | |
4c98cfef | 197 | } |
1da177e4 LT |
198 | |
199 | struct bus_type pnp_bus_type = { | |
9dd78466 BH |
200 | .name = "pnp", |
201 | .match = pnp_bus_match, | |
202 | .probe = pnp_device_probe, | |
203 | .remove = pnp_device_remove, | |
4c98cfef TI |
204 | .suspend = pnp_bus_suspend, |
205 | .resume = pnp_bus_resume, | |
1da177e4 LT |
206 | }; |
207 | ||
1da177e4 LT |
208 | int pnp_register_driver(struct pnp_driver *drv) |
209 | { | |
1da177e4 LT |
210 | pnp_dbg("the driver '%s' has been registered", drv->name); |
211 | ||
212 | drv->driver.name = drv->name; | |
213 | drv->driver.bus = &pnp_bus_type; | |
1da177e4 | 214 | |
982c6094 | 215 | return driver_register(&drv->driver); |
1da177e4 LT |
216 | } |
217 | ||
218 | void pnp_unregister_driver(struct pnp_driver *drv) | |
219 | { | |
220 | driver_unregister(&drv->driver); | |
221 | pnp_dbg("the driver '%s' has been unregistered", drv->name); | |
222 | } | |
223 | ||
224 | /** | |
225 | * pnp_add_id - adds an EISA id to the specified device | |
226 | * @id: pointer to a pnp_id structure | |
227 | * @dev: pointer to the desired device | |
228 | * | |
229 | */ | |
230 | ||
231 | int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev) | |
232 | { | |
233 | struct pnp_id *ptr; | |
234 | if (!id) | |
235 | return -EINVAL; | |
236 | if (!dev) | |
237 | return -EINVAL; | |
238 | id->next = NULL; | |
239 | ptr = dev->id; | |
240 | while (ptr && ptr->next) | |
241 | ptr = ptr->next; | |
242 | if (ptr) | |
243 | ptr->next = id; | |
244 | else | |
245 | dev->id = id; | |
246 | return 0; | |
247 | } | |
248 | ||
249 | EXPORT_SYMBOL(pnp_register_driver); | |
250 | EXPORT_SYMBOL(pnp_unregister_driver); | |
b449f63c | 251 | #if 0 |
1da177e4 | 252 | EXPORT_SYMBOL(pnp_add_id); |
b449f63c | 253 | #endif |
1da177e4 LT |
254 | EXPORT_SYMBOL(pnp_device_attach); |
255 | EXPORT_SYMBOL(pnp_device_detach); |