PNP: Lindent all source files
[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
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>
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 */
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         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);
61         if (pnp_dev->status != PNP_READY) {
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
88         pnp_dbg("match found with the PnP device '%s' and the driver '%s'",
89                 dev->bus_id, pnp_drv->name);
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)
102                    == PNP_DRIVER_RES_DISABLE) {
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         }
113         if (error >= 0) {
114                 pnp_dev->driver = pnp_drv;
115                 error = 0;
116         } else
117                 goto fail;
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         if (match_device(pnp_drv, pnp_dev) == NULL)
144                 return 0;
145         return 1;
146 }
147
148 static int pnp_bus_suspend(struct device *dev, pm_message_t state)
149 {
150         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
151         struct pnp_driver *pnp_drv = pnp_dev->driver;
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)) {
165                 error = pnp_stop_dev(pnp_dev);
166                 if (error)
167                         return error;
168         }
169
170         if (pnp_dev->protocol && 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 && pnp_dev->protocol->resume)
185                 pnp_dev->protocol->resume(pnp_dev);
186
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         }
192
193         if (pnp_drv->resume)
194                 return pnp_drv->resume(pnp_dev);
195
196         return 0;
197 }
198
199 struct bus_type pnp_bus_type = {
200         .name = "pnp",
201         .match = pnp_bus_match,
202         .probe = pnp_device_probe,
203         .remove = pnp_device_remove,
204         .suspend = pnp_bus_suspend,
205         .resume = pnp_bus_resume,
206 };
207
208 int pnp_register_driver(struct pnp_driver *drv)
209 {
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;
214
215         return driver_register(&drv->driver);
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);
251 #if 0
252 EXPORT_SYMBOL(pnp_add_id);
253 #endif
254 EXPORT_SYMBOL(pnp_device_attach);
255 EXPORT_SYMBOL(pnp_device_detach);