[SCSI] zfcp: Cleanup function parameters for sbal value.
[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         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         return error;
118
119 fail:
120         pnp_device_detach(pnp_dev);
121         return error;
122 }
123
124 static int pnp_device_remove(struct device *dev)
125 {
126         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
127         struct pnp_driver *drv = pnp_dev->driver;
128
129         if (drv) {
130                 if (drv->remove)
131                         drv->remove(pnp_dev);
132                 pnp_dev->driver = NULL;
133         }
134         pnp_device_detach(pnp_dev);
135         return 0;
136 }
137
138 static void pnp_device_shutdown(struct device *dev)
139 {
140         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
141         struct pnp_driver *drv = pnp_dev->driver;
142
143         if (drv && drv->shutdown)
144                 drv->shutdown(pnp_dev);
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
152         if (match_device(pnp_drv, pnp_dev) == NULL)
153                 return 0;
154         return 1;
155 }
156
157 static int pnp_bus_suspend(struct device *dev, pm_message_t state)
158 {
159         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
160         struct pnp_driver *pnp_drv = pnp_dev->driver;
161         int error;
162
163         if (!pnp_drv)
164                 return 0;
165
166         if (pnp_drv->suspend) {
167                 error = pnp_drv->suspend(pnp_dev, state);
168                 if (error)
169                         return error;
170         }
171
172         if (pnp_can_disable(pnp_dev)) {
173                 error = pnp_stop_dev(pnp_dev);
174                 if (error)
175                         return error;
176         }
177
178         if (pnp_dev->protocol->suspend)
179                 pnp_dev->protocol->suspend(pnp_dev, state);
180         return 0;
181 }
182
183 static int pnp_bus_resume(struct device *dev)
184 {
185         struct pnp_dev *pnp_dev = to_pnp_dev(dev);
186         struct pnp_driver *pnp_drv = pnp_dev->driver;
187         int error;
188
189         if (!pnp_drv)
190                 return 0;
191
192         if (pnp_dev->protocol->resume)
193                 pnp_dev->protocol->resume(pnp_dev);
194
195         if (pnp_can_write(pnp_dev)) {
196                 error = pnp_start_dev(pnp_dev);
197                 if (error)
198                         return error;
199         }
200
201         if (pnp_drv->resume) {
202                 error = pnp_drv->resume(pnp_dev);
203                 if (error)
204                         return error;
205         }
206
207         return 0;
208 }
209
210 struct bus_type pnp_bus_type = {
211         .name    = "pnp",
212         .match   = pnp_bus_match,
213         .probe   = pnp_device_probe,
214         .remove  = pnp_device_remove,
215         .shutdown = pnp_device_shutdown,
216         .suspend = pnp_bus_suspend,
217         .resume  = pnp_bus_resume,
218         .dev_attrs = pnp_interface_attrs,
219 };
220
221 int pnp_register_driver(struct pnp_driver *drv)
222 {
223         drv->driver.name = drv->name;
224         drv->driver.bus = &pnp_bus_type;
225
226         return driver_register(&drv->driver);
227 }
228
229 void pnp_unregister_driver(struct pnp_driver *drv)
230 {
231         driver_unregister(&drv->driver);
232 }
233
234 /**
235  * pnp_add_id - adds an EISA id to the specified device
236  * @dev: pointer to the desired device
237  * @id: pointer to an EISA id string
238  */
239 struct pnp_id *pnp_add_id(struct pnp_dev *dev, char *id)
240 {
241         struct pnp_id *dev_id, *ptr;
242
243         dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
244         if (!dev_id)
245                 return NULL;
246
247         dev_id->id[0] = id[0];
248         dev_id->id[1] = id[1];
249         dev_id->id[2] = id[2];
250         dev_id->id[3] = tolower(id[3]);
251         dev_id->id[4] = tolower(id[4]);
252         dev_id->id[5] = tolower(id[5]);
253         dev_id->id[6] = tolower(id[6]);
254         dev_id->id[7] = '\0';
255
256         dev_id->next = NULL;
257         ptr = dev->id;
258         while (ptr && ptr->next)
259                 ptr = ptr->next;
260         if (ptr)
261                 ptr->next = dev_id;
262         else
263                 dev->id = dev_id;
264
265         return dev_id;
266 }
267
268 EXPORT_SYMBOL(pnp_register_driver);
269 EXPORT_SYMBOL(pnp_unregister_driver);
270 EXPORT_SYMBOL(pnp_device_attach);
271 EXPORT_SYMBOL(pnp_device_detach);