Merge with rsync://fileserver/linux
[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/config.h>
9 #include <linux/string.h>
10 #include <linux/list.h>
11 #include <linux/module.h>
12 #include <linux/ctype.h>
13 #include <linux/slab.h>
14
15 #ifdef CONFIG_PNP_DEBUG
16         #define DEBUG
17 #else
18         #undef DEBUG
19 #endif
20
21 #include <linux/pnp.h>
22 #include "base.h"
23
24 static int compare_func(const char *ida, const char *idb)
25 {
26         int i;
27         /* we only need to compare the last 4 chars */
28         for (i=3; i<7; i++)
29         {
30                 if (ida[i] != 'X' &&
31                     idb[i] != 'X' &&
32                     toupper(ida[i]) != toupper(idb[i]))
33                         return 0;
34         }
35         return 1;
36 }
37
38 int compare_pnp_id(struct pnp_id *pos, const char *id)
39 {
40         if (!pos || !id || (strlen(id) != 7))
41                 return 0;
42         if (memcmp(id,"ANYDEVS",7)==0)
43                 return 1;
44         while (pos){
45                 if (memcmp(pos->id,id,3)==0)
46                         if (compare_func(pos->id,id)==1)
47                                 return 1;
48                 pos = pos->next;
49         }
50         return 0;
51 }
52
53 static const struct pnp_device_id * match_device(struct pnp_driver *drv, struct pnp_dev *dev)
54 {
55         const struct pnp_device_id *drv_id = drv->id_table;
56         if (!drv_id)
57                 return NULL;
58
59         while (*drv_id->id) {
60                 if (compare_pnp_id(dev->id, drv_id->id))
61                         return drv_id;
62                 drv_id++;
63         }
64         return NULL;
65 }
66
67 int pnp_device_attach(struct pnp_dev *pnp_dev)
68 {
69         spin_lock(&pnp_lock);
70         if(pnp_dev->status != PNP_READY){
71                 spin_unlock(&pnp_lock);
72                 return -EBUSY;
73         }
74         pnp_dev->status = PNP_ATTACHED;
75         spin_unlock(&pnp_lock);
76         return 0;
77 }
78
79 void pnp_device_detach(struct pnp_dev *pnp_dev)
80 {
81         spin_lock(&pnp_lock);
82         if (pnp_dev->status == PNP_ATTACHED)
83                 pnp_dev->status = PNP_READY;
84         spin_unlock(&pnp_lock);
85         pnp_disable_dev(pnp_dev);
86 }
87
88 static int pnp_device_probe(struct device *dev)
89 {
90         int error;
91         struct pnp_driver *pnp_drv;
92         struct pnp_dev *pnp_dev;
93         const struct pnp_device_id *dev_id = NULL;
94         pnp_dev = to_pnp_dev(dev);
95         pnp_drv = to_pnp_driver(dev->driver);
96
97         pnp_dbg("match found with the PnP device '%s' and the driver '%s'", dev->bus_id,pnp_drv->name);
98
99         error = pnp_device_attach(pnp_dev);
100         if (error < 0)
101                 return error;
102
103         if (pnp_dev->active == 0) {
104                 if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
105                         error = pnp_activate_dev(pnp_dev);
106                         if (error < 0)
107                                 return error;
108                 }
109         } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
110                     == PNP_DRIVER_RES_DISABLE) {
111                 error = pnp_disable_dev(pnp_dev);
112                 if (error < 0)
113                         return error;
114         }
115         error = 0;
116         if (pnp_drv->probe) {
117                 dev_id = match_device(pnp_drv, pnp_dev);
118                 if (dev_id != NULL)
119                         error = pnp_drv->probe(pnp_dev, dev_id);
120         }
121         if (error >= 0){
122                 pnp_dev->driver = pnp_drv;
123                 error = 0;
124         } else
125                 goto fail;
126         return error;
127
128 fail:
129         pnp_device_detach(pnp_dev);
130         return error;
131 }
132
133 static int pnp_device_remove(struct device *dev)
134 {
135         struct pnp_dev * pnp_dev = to_pnp_dev(dev);
136         struct pnp_driver * drv = pnp_dev->driver;
137
138         if (drv) {
139                 if (drv->remove)
140                         drv->remove(pnp_dev);
141                 pnp_dev->driver = NULL;
142         }
143         pnp_device_detach(pnp_dev);
144         return 0;
145 }
146
147 static int pnp_bus_match(struct device *dev, struct device_driver *drv)
148 {
149         struct pnp_dev * pnp_dev = to_pnp_dev(dev);
150         struct pnp_driver * pnp_drv = to_pnp_driver(drv);
151         if (match_device(pnp_drv, pnp_dev) == NULL)
152                 return 0;
153         return 1;
154 }
155
156
157 struct bus_type pnp_bus_type = {
158         .name   = "pnp",
159         .match  = pnp_bus_match,
160 };
161
162
163 static int count_devices(struct device * dev, void * c)
164 {
165         int * count = c;
166         (*count)++;
167         return 0;
168 }
169
170 int pnp_register_driver(struct pnp_driver *drv)
171 {
172         int count;
173
174         pnp_dbg("the driver '%s' has been registered", drv->name);
175
176         drv->driver.name = drv->name;
177         drv->driver.bus = &pnp_bus_type;
178         drv->driver.probe = pnp_device_probe;
179         drv->driver.remove = pnp_device_remove;
180
181         count = driver_register(&drv->driver);
182
183         /* get the number of initial matches */
184         if (count >= 0){
185                 count = 0;
186                 driver_for_each_device(&drv->driver, NULL, &count, count_devices);
187         }
188         return count;
189 }
190
191 void pnp_unregister_driver(struct pnp_driver *drv)
192 {
193         driver_unregister(&drv->driver);
194         pnp_dbg("the driver '%s' has been unregistered", drv->name);
195 }
196
197 /**
198  * pnp_add_id - adds an EISA id to the specified device
199  * @id: pointer to a pnp_id structure
200  * @dev: pointer to the desired device
201  *
202  */
203
204 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
205 {
206         struct pnp_id *ptr;
207         if (!id)
208                 return -EINVAL;
209         if (!dev)
210                 return -EINVAL;
211         id->next = NULL;
212         ptr = dev->id;
213         while (ptr && ptr->next)
214                 ptr = ptr->next;
215         if (ptr)
216                 ptr->next = id;
217         else
218                 dev->id = id;
219         return 0;
220 }
221
222 EXPORT_SYMBOL(pnp_register_driver);
223 EXPORT_SYMBOL(pnp_unregister_driver);
224 EXPORT_SYMBOL(pnp_add_id);
225 EXPORT_SYMBOL(pnp_device_attach);
226 EXPORT_SYMBOL(pnp_device_detach);