Merge master.kernel.org:/pub/scm/linux/kernel/git/steve/gfs2-2.6-nmw
[linux-2.6] / 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         {
22                 if (ida[i] != 'X' &&
23                     idb[i] != 'X' &&
24                     toupper(ida[i]) != toupper(idb[i]))
25                         return 0;
26         }
27         return 1;
28 }
29
30 int compare_pnp_id(struct pnp_id *pos, const char *id)
31 {
32         if (!pos || !id || (strlen(id) != 7))
33                 return 0;
34         if (memcmp(id,"ANYDEVS",7)==0)
35                 return 1;
36         while (pos){
37                 if (memcmp(pos->id,id,3)==0)
38                         if (compare_func(pos->id,id)==1)
39                                 return 1;
40                 pos = pos->next;
41         }
42         return 0;
43 }
44
45 static const struct pnp_device_id * match_device(struct pnp_driver *drv, struct pnp_dev *dev)
46 {
47         const struct pnp_device_id *drv_id = drv->id_table;
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'", 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         return 0;
171 }
172
173 static int pnp_bus_resume(struct device *dev)
174 {
175         struct pnp_dev * pnp_dev = to_pnp_dev(dev);
176         struct pnp_driver * pnp_drv = pnp_dev->driver;
177         int error;
178
179         if (!pnp_drv)
180                 return 0;
181
182         if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
183                 error = pnp_start_dev(pnp_dev);
184                 if (error)
185                         return error;
186         }
187
188         if (pnp_drv->resume)
189                 return pnp_drv->resume(pnp_dev);
190
191         return 0;
192 }
193
194 struct bus_type pnp_bus_type = {
195         .name   = "pnp",
196         .match  = pnp_bus_match,
197         .probe  = pnp_device_probe,
198         .remove = pnp_device_remove,
199         .suspend = pnp_bus_suspend,
200         .resume = pnp_bus_resume,
201 };
202
203 int pnp_register_driver(struct pnp_driver *drv)
204 {
205         pnp_dbg("the driver '%s' has been registered", drv->name);
206
207         drv->driver.name = drv->name;
208         drv->driver.bus = &pnp_bus_type;
209
210         return driver_register(&drv->driver);
211 }
212
213 void pnp_unregister_driver(struct pnp_driver *drv)
214 {
215         driver_unregister(&drv->driver);
216         pnp_dbg("the driver '%s' has been unregistered", drv->name);
217 }
218
219 /**
220  * pnp_add_id - adds an EISA id to the specified device
221  * @id: pointer to a pnp_id structure
222  * @dev: pointer to the desired device
223  *
224  */
225
226 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
227 {
228         struct pnp_id *ptr;
229         if (!id)
230                 return -EINVAL;
231         if (!dev)
232                 return -EINVAL;
233         id->next = NULL;
234         ptr = dev->id;
235         while (ptr && ptr->next)
236                 ptr = ptr->next;
237         if (ptr)
238                 ptr->next = id;
239         else
240                 dev->id = id;
241         return 0;
242 }
243
244 EXPORT_SYMBOL(pnp_register_driver);
245 EXPORT_SYMBOL(pnp_unregister_driver);
246 #if 0
247 EXPORT_SYMBOL(pnp_add_id);
248 #endif
249 EXPORT_SYMBOL(pnp_device_attach);
250 EXPORT_SYMBOL(pnp_device_detach);