PNP: fix up after Lindent
[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         pnp_dbg("match found with the PnP device '%s' and the driver '%s'",
90                 dev->bus_id, pnp_drv->name);
91
92         error = pnp_device_attach(pnp_dev);
93         if (error < 0)
94                 return error;
95
96         if (pnp_dev->active == 0) {
97                 if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
98                         error = pnp_activate_dev(pnp_dev);
99                         if (error < 0)
100                                 return error;
101                 }
102         } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
103                    == PNP_DRIVER_RES_DISABLE) {
104                 error = pnp_disable_dev(pnp_dev);
105                 if (error < 0)
106                         return error;
107         }
108         error = 0;
109         if (pnp_drv->probe) {
110                 dev_id = match_device(pnp_drv, pnp_dev);
111                 if (dev_id != NULL)
112                         error = pnp_drv->probe(pnp_dev, dev_id);
113         }
114         if (error >= 0) {
115                 pnp_dev->driver = pnp_drv;
116                 error = 0;
117         } else
118                 goto fail;
119         return error;
120
121       fail:
122         pnp_device_detach(pnp_dev);
123         return error;
124 }
125
126 static int pnp_device_remove(struct device *dev)
127 {
128         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
129         struct pnp_driver *drv = pnp_dev->driver;
130
131         if (drv) {
132                 if (drv->remove)
133                         drv->remove(pnp_dev);
134                 pnp_dev->driver = NULL;
135         }
136         pnp_device_detach(pnp_dev);
137         return 0;
138 }
139
140 static int pnp_bus_match(struct device *dev, struct device_driver *drv)
141 {
142         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
143         struct pnp_driver *pnp_drv = to_pnp_driver(drv);
144
145         if (match_device(pnp_drv, pnp_dev) == NULL)
146                 return 0;
147         return 1;
148 }
149
150 static int pnp_bus_suspend(struct device *dev, pm_message_t state)
151 {
152         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
153         struct pnp_driver *pnp_drv = pnp_dev->driver;
154         int error;
155
156         if (!pnp_drv)
157                 return 0;
158
159         if (pnp_drv->suspend) {
160                 error = pnp_drv->suspend(pnp_dev, state);
161                 if (error)
162                         return error;
163         }
164
165         if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) &&
166             pnp_can_disable(pnp_dev)) {
167                 error = pnp_stop_dev(pnp_dev);
168                 if (error)
169                         return error;
170         }
171
172         if (pnp_dev->protocol && pnp_dev->protocol->suspend)
173                 pnp_dev->protocol->suspend(pnp_dev, state);
174         return 0;
175 }
176
177 static int pnp_bus_resume(struct device *dev)
178 {
179         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
180         struct pnp_driver *pnp_drv = pnp_dev->driver;
181         int error;
182
183         if (!pnp_drv)
184                 return 0;
185
186         if (pnp_dev->protocol && pnp_dev->protocol->resume)
187                 pnp_dev->protocol->resume(pnp_dev);
188
189         if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
190                 error = pnp_start_dev(pnp_dev);
191                 if (error)
192                         return error;
193         }
194
195         if (pnp_drv->resume)
196                 return pnp_drv->resume(pnp_dev);
197
198         return 0;
199 }
200
201 struct bus_type pnp_bus_type = {
202         .name    = "pnp",
203         .match   = pnp_bus_match,
204         .probe   = pnp_device_probe,
205         .remove  = pnp_device_remove,
206         .suspend = pnp_bus_suspend,
207         .resume  = pnp_bus_resume,
208 };
209
210 int pnp_register_driver(struct pnp_driver *drv)
211 {
212         pnp_dbg("the driver '%s' has been registered", drv->name);
213
214         drv->driver.name = drv->name;
215         drv->driver.bus = &pnp_bus_type;
216
217         return driver_register(&drv->driver);
218 }
219
220 void pnp_unregister_driver(struct pnp_driver *drv)
221 {
222         driver_unregister(&drv->driver);
223         pnp_dbg("the driver '%s' has been unregistered", drv->name);
224 }
225
226 /**
227  * pnp_add_id - adds an EISA id to the specified device
228  * @id: pointer to a pnp_id structure
229  * @dev: pointer to the desired device
230  */
231 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
232 {
233         struct pnp_id *ptr;
234
235         if (!id)
236                 return -EINVAL;
237         if (!dev)
238                 return -EINVAL;
239         id->next = NULL;
240         ptr = dev->id;
241         while (ptr && ptr->next)
242                 ptr = ptr->next;
243         if (ptr)
244                 ptr->next = id;
245         else
246                 dev->id = id;
247         return 0;
248 }
249
250 EXPORT_SYMBOL(pnp_register_driver);
251 EXPORT_SYMBOL(pnp_unregister_driver);
252 EXPORT_SYMBOL(pnp_device_attach);
253 EXPORT_SYMBOL(pnp_device_detach);