V4L/DVB (3527): VIDEO_CPIA2 must depend on USB
[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 #include <linux/pnp.h>
15 #include "base.h"
16
17 static int compare_func(const char *ida, const char *idb)
18 {
19         int i;
20         /* we only need to compare the last 4 chars */
21         for (i=3; i<7; i++)
22         {
23                 if (ida[i] != 'X' &&
24                     idb[i] != 'X' &&
25                     toupper(ida[i]) != toupper(idb[i]))
26                         return 0;
27         }
28         return 1;
29 }
30
31 int compare_pnp_id(struct pnp_id *pos, const char *id)
32 {
33         if (!pos || !id || (strlen(id) != 7))
34                 return 0;
35         if (memcmp(id,"ANYDEVS",7)==0)
36                 return 1;
37         while (pos){
38                 if (memcmp(pos->id,id,3)==0)
39                         if (compare_func(pos->id,id)==1)
40                                 return 1;
41                 pos = pos->next;
42         }
43         return 0;
44 }
45
46 static const struct pnp_device_id * match_device(struct pnp_driver *drv, struct pnp_dev *dev)
47 {
48         const struct pnp_device_id *drv_id = drv->id_table;
49         if (!drv_id)
50                 return NULL;
51
52         while (*drv_id->id) {
53                 if (compare_pnp_id(dev->id, drv_id->id))
54                         return drv_id;
55                 drv_id++;
56         }
57         return NULL;
58 }
59
60 int pnp_device_attach(struct pnp_dev *pnp_dev)
61 {
62         spin_lock(&pnp_lock);
63         if(pnp_dev->status != PNP_READY){
64                 spin_unlock(&pnp_lock);
65                 return -EBUSY;
66         }
67         pnp_dev->status = PNP_ATTACHED;
68         spin_unlock(&pnp_lock);
69         return 0;
70 }
71
72 void pnp_device_detach(struct pnp_dev *pnp_dev)
73 {
74         spin_lock(&pnp_lock);
75         if (pnp_dev->status == PNP_ATTACHED)
76                 pnp_dev->status = PNP_READY;
77         spin_unlock(&pnp_lock);
78         pnp_disable_dev(pnp_dev);
79 }
80
81 static int pnp_device_probe(struct device *dev)
82 {
83         int error;
84         struct pnp_driver *pnp_drv;
85         struct pnp_dev *pnp_dev;
86         const struct pnp_device_id *dev_id = NULL;
87         pnp_dev = to_pnp_dev(dev);
88         pnp_drv = to_pnp_driver(dev->driver);
89
90         pnp_dbg("match found with the PnP device '%s' and the driver '%s'", 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         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_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) &&
165             pnp_can_disable(pnp_dev)) {
166                 error = pnp_stop_dev(pnp_dev);
167                 if (error)
168                         return error;
169         }
170
171         return 0;
172 }
173
174 static int pnp_bus_resume(struct device *dev)
175 {
176         struct pnp_dev * pnp_dev = to_pnp_dev(dev);
177         struct pnp_driver * pnp_drv = pnp_dev->driver;
178         int error;
179
180         if (!pnp_drv)
181                 return 0;
182
183         if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
184                 error = pnp_start_dev(pnp_dev);
185                 if (error)
186                         return error;
187         }
188
189         if (pnp_drv->resume)
190                 return pnp_drv->resume(pnp_dev);
191
192         return 0;
193 }
194
195 struct bus_type pnp_bus_type = {
196         .name   = "pnp",
197         .match  = pnp_bus_match,
198         .probe  = pnp_device_probe,
199         .remove = pnp_device_remove,
200         .suspend = pnp_bus_suspend,
201         .resume = pnp_bus_resume,
202 };
203
204
205 static int count_devices(struct device * dev, void * c)
206 {
207         int * count = c;
208         (*count)++;
209         return 0;
210 }
211
212 int pnp_register_driver(struct pnp_driver *drv)
213 {
214         int count;
215
216         pnp_dbg("the driver '%s' has been registered", drv->name);
217
218         drv->driver.name = drv->name;
219         drv->driver.bus = &pnp_bus_type;
220
221         count = driver_register(&drv->driver);
222
223         /* get the number of initial matches */
224         if (count >= 0){
225                 count = 0;
226                 driver_for_each_device(&drv->driver, NULL, &count, count_devices);
227         }
228         return count;
229 }
230
231 void pnp_unregister_driver(struct pnp_driver *drv)
232 {
233         driver_unregister(&drv->driver);
234         pnp_dbg("the driver '%s' has been unregistered", drv->name);
235 }
236
237 /**
238  * pnp_add_id - adds an EISA id to the specified device
239  * @id: pointer to a pnp_id structure
240  * @dev: pointer to the desired device
241  *
242  */
243
244 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
245 {
246         struct pnp_id *ptr;
247         if (!id)
248                 return -EINVAL;
249         if (!dev)
250                 return -EINVAL;
251         id->next = NULL;
252         ptr = dev->id;
253         while (ptr && ptr->next)
254                 ptr = ptr->next;
255         if (ptr)
256                 ptr->next = id;
257         else
258                 dev->id = id;
259         return 0;
260 }
261
262 EXPORT_SYMBOL(pnp_register_driver);
263 EXPORT_SYMBOL(pnp_unregister_driver);
264 #if 0
265 EXPORT_SYMBOL(pnp_add_id);
266 #endif
267 EXPORT_SYMBOL(pnp_device_attach);
268 EXPORT_SYMBOL(pnp_device_detach);