[Bluetooth] Fix userspace breakage due missing class links
[linux-2.6.git] / drivers / pnp / driver.c
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         dev_dbg(dev, "driver attached\n");
118         return error;
119
120 fail:
121         pnp_device_detach(pnp_dev);
122         return error;
123 }
124
125 static int pnp_device_remove(struct device *dev)
126 {
127         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
128         struct pnp_driver *drv = pnp_dev->driver;
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 {
141         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
142         struct pnp_driver *pnp_drv = to_pnp_driver(drv);
143
144         if (match_device(pnp_drv, pnp_dev) == NULL)
145                 return 0;
146         return 1;
147 }
148
149 static int pnp_bus_suspend(struct device *dev, pm_message_t state)
150 {
151         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
152         struct pnp_driver *pnp_drv = pnp_dev->driver;
153         int error;
154
155         if (!pnp_drv)
156                 return 0;
157
158         if (pnp_drv->suspend) {
159                 error = pnp_drv->suspend(pnp_dev, state);
160                 if (error)
161                         return error;
162         }
163
164         if (pnp_can_disable(pnp_dev)) {
165                 error = pnp_stop_dev(pnp_dev);
166                 if (error)
167                         return error;
168         }
169
170         if (pnp_dev->protocol->suspend)
171                 pnp_dev->protocol->suspend(pnp_dev, state);
172         return 0;
173 }
174
175 static int pnp_bus_resume(struct device *dev)
176 {
177         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
178         struct pnp_driver *pnp_drv = pnp_dev->driver;
179         int error;
180
181         if (!pnp_drv)
182                 return 0;
183
184         if (pnp_dev->protocol->resume)
185                 pnp_dev->protocol->resume(pnp_dev);
186
187         if (pnp_can_write(pnp_dev)) {
188                 error = pnp_start_dev(pnp_dev);
189                 if (error)
190                         return error;
191         }
192
193         if (pnp_drv->resume) {
194                 error = pnp_drv->resume(pnp_dev);
195                 if (error)
196                         return error;
197         }
198
199         return 0;
200 }
201
202 struct bus_type pnp_bus_type = {
203         .name    = "pnp",
204         .match   = pnp_bus_match,
205         .probe   = pnp_device_probe,
206         .remove  = pnp_device_remove,
207         .suspend = pnp_bus_suspend,
208         .resume  = pnp_bus_resume,
209 };
210
211 int pnp_register_driver(struct pnp_driver *drv)
212 {
213         pnp_dbg("the driver '%s' has been registered", drv->name);
214
215         drv->driver.name = drv->name;
216         drv->driver.bus = &pnp_bus_type;
217
218         return driver_register(&drv->driver);
219 }
220
221 void pnp_unregister_driver(struct pnp_driver *drv)
222 {
223         driver_unregister(&drv->driver);
224         pnp_dbg("the driver '%s' has been unregistered", drv->name);
225 }
226
227 /**
228  * pnp_add_id - adds an EISA id to the specified device
229  * @dev: pointer to the desired device
230  * @id: pointer to an EISA id string
231  */
232 struct pnp_id *pnp_add_id(struct pnp_dev *dev, char *id)
233 {
234         struct pnp_id *dev_id, *ptr;
235
236         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
237         if (!dev_id)
238                 return NULL;
239
240         dev_id->id[0] = id[0];
241         dev_id->id[1] = id[1];
242         dev_id->id[2] = id[2];
243         dev_id->id[3] = tolower(id[3]);
244         dev_id->id[4] = tolower(id[4]);
245         dev_id->id[5] = tolower(id[5]);
246         dev_id->id[6] = tolower(id[6]);
247         dev_id->id[7] = '\0';
248
249         dev_id->next = NULL;
250         ptr = dev->id;
251         while (ptr && ptr->next)
252                 ptr = ptr->next;
253         if (ptr)
254                 ptr->next = dev_id;
255         else
256                 dev->id = dev_id;
257
258         return dev_id;
259 }
260
261 EXPORT_SYMBOL(pnp_register_driver);
262 EXPORT_SYMBOL(pnp_unregister_driver);
263 EXPORT_SYMBOL(pnp_device_attach);
264 EXPORT_SYMBOL(pnp_device_detach);