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
compare_func(const char * ida,const char * idb)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
compare_pnp_id(struct pnp_id * pos,const char * id)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
match_device(struct pnp_driver * drv,struct pnp_dev * dev)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
pnp_device_attach(struct pnp_dev * pnp_dev)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
pnp_device_detach(struct pnp_dev * pnp_dev)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
pnp_device_probe(struct device * dev)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
pnp_device_remove(struct device * dev)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
pnp_device_shutdown(struct device * dev)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
pnp_bus_match(struct device * dev,struct device_driver * drv)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
pnp_bus_suspend(struct device * dev,pm_message_t state)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
pnp_bus_resume(struct device * dev)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 error = pnp_dev->protocol->resume(pnp_dev);
194 if (error)
195 return error;
196 }
197
198 if (pnp_can_write(pnp_dev)) {
199 error = pnp_start_dev(pnp_dev);
200 if (error)
201 return error;
202 }
203
204 if (pnp_drv->resume) {
205 error = pnp_drv->resume(pnp_dev);
206 if (error)
207 return error;
208 }
209
210 return 0;
211 }
212
213 struct bus_type pnp_bus_type = {
214 .name = "pnp",
215 .match = pnp_bus_match,
216 .probe = pnp_device_probe,
217 .remove = pnp_device_remove,
218 .shutdown = pnp_device_shutdown,
219 .suspend = pnp_bus_suspend,
220 .resume = pnp_bus_resume,
221 .dev_attrs = pnp_interface_attrs,
222 };
223
pnp_register_driver(struct pnp_driver * drv)224 int pnp_register_driver(struct pnp_driver *drv)
225 {
226 drv->driver.name = drv->name;
227 drv->driver.bus = &pnp_bus_type;
228
229 return driver_register(&drv->driver);
230 }
231
pnp_unregister_driver(struct pnp_driver * drv)232 void pnp_unregister_driver(struct pnp_driver *drv)
233 {
234 driver_unregister(&drv->driver);
235 }
236
237 /**
238 * pnp_add_id - adds an EISA id to the specified device
239 * @dev: pointer to the desired device
240 * @id: pointer to an EISA id string
241 */
pnp_add_id(struct pnp_dev * dev,const char * id)242 struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id)
243 {
244 struct pnp_id *dev_id, *ptr;
245
246 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
247 if (!dev_id)
248 return NULL;
249
250 dev_id->id[0] = id[0];
251 dev_id->id[1] = id[1];
252 dev_id->id[2] = id[2];
253 dev_id->id[3] = tolower(id[3]);
254 dev_id->id[4] = tolower(id[4]);
255 dev_id->id[5] = tolower(id[5]);
256 dev_id->id[6] = tolower(id[6]);
257 dev_id->id[7] = '\0';
258
259 dev_id->next = NULL;
260 ptr = dev->id;
261 while (ptr && ptr->next)
262 ptr = ptr->next;
263 if (ptr)
264 ptr->next = dev_id;
265 else
266 dev->id = dev_id;
267
268 return dev_id;
269 }
270
271 EXPORT_SYMBOL(pnp_register_driver);
272 EXPORT_SYMBOL(pnp_unregister_driver);
273 EXPORT_SYMBOL(pnp_device_attach);
274 EXPORT_SYMBOL(pnp_device_detach);
275