Revert "scsi: revert "[SCSI] Get rid of scsi_cmnd->done""
[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 #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         error = pnp_device_attach(pnp_dev);
90         if (error < 0)
91                 return error;
92
93         if (pnp_dev->active == 0) {
94                 if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
95                         error = pnp_activate_dev(pnp_dev);
96                         if (error < 0)
97                                 return error;
98                 }
99         } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
100                    == PNP_DRIVER_RES_DISABLE) {
101                 error = pnp_disable_dev(pnp_dev);
102                 if (error < 0)
103                         return error;
104         }
105         error = 0;
106         if (pnp_drv->probe) {
107                 dev_id = match_device(pnp_drv, pnp_dev);
108                 if (dev_id != NULL)
109                         error = pnp_drv->probe(pnp_dev, dev_id);
110         }
111         if (error >= 0) {
112                 pnp_dev->driver = pnp_drv;
113                 error = 0;
114         } else
115                 goto fail;
116
117         dev_dbg(dev, "driver attached\n");
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
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         if (pnp_dev->protocol && pnp_dev->protocol->suspend)
172                 pnp_dev->protocol->suspend(pnp_dev, state);
173         return 0;
174 }
175
176 static int pnp_bus_resume(struct device *dev)
177 {
178         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
179         struct pnp_driver *pnp_drv = pnp_dev->driver;
180         int error;
181
182         if (!pnp_drv)
183                 return 0;
184
185         if (pnp_dev->protocol && pnp_dev->protocol->resume)
186                 pnp_dev->protocol->resume(pnp_dev);
187
188         if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
189                 error = pnp_start_dev(pnp_dev);
190                 if (error)
191                         return error;
192         }
193
194         if (pnp_drv->resume)
195                 return pnp_drv->resume(pnp_dev);
196
197         return 0;
198 }
199
200 struct bus_type pnp_bus_type = {
201         .name    = "pnp",
202         .match   = pnp_bus_match,
203         .probe   = pnp_device_probe,
204         .remove  = pnp_device_remove,
205         .suspend = pnp_bus_suspend,
206         .resume  = pnp_bus_resume,
207 };
208
209 int pnp_register_driver(struct pnp_driver *drv)
210 {
211         pnp_dbg("the driver '%s' has been registered", drv->name);
212
213         drv->driver.name = drv->name;
214         drv->driver.bus = &pnp_bus_type;
215
216         return driver_register(&drv->driver);
217 }
218
219 void pnp_unregister_driver(struct pnp_driver *drv)
220 {
221         driver_unregister(&drv->driver);
222         pnp_dbg("the driver '%s' has been unregistered", drv->name);
223 }
224
225 /**
226  * pnp_add_id - adds an EISA id to the specified device
227  * @id: pointer to a pnp_id structure
228  * @dev: pointer to the desired device
229  */
230 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
231 {
232         struct pnp_id *ptr;
233
234         id->next = NULL;
235         ptr = dev->id;
236         while (ptr && ptr->next)
237                 ptr = ptr->next;
238         if (ptr)
239                 ptr->next = id;
240         else
241                 dev->id = id;
242         return 0;
243 }
244
245 EXPORT_SYMBOL(pnp_register_driver);
246 EXPORT_SYMBOL(pnp_unregister_driver);
247 EXPORT_SYMBOL(pnp_device_attach);
248 EXPORT_SYMBOL(pnp_device_detach);