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_can_disable(pnp_dev)) {
165 error = pnp_stop_dev(pnp_dev);
166 if (error)
167 return error;
168 }
169
170 if (pnp_dev->protocol && pnp_dev->protocol->suspend)
171 pnp_dev->protocol->suspend(pnp_dev, state);
172 return 0;
173 }
174
175 static int pnp_bus_resume(struct device *dev)
176 {
177 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
178 struct pnp_driver *pnp_drv = pnp_dev->driver;
179 int error;
180
181 if (!pnp_drv)
182 return 0;
183
184 if (pnp_dev->protocol && pnp_dev->protocol->resume)
185 pnp_dev->protocol->resume(pnp_dev);
186
187 if (pnp_can_write(pnp_dev)) {
188 error = pnp_start_dev(pnp_dev);
189 if (error)
190 return error;
191 }
192
193 if (pnp_drv->resume) {
194 error = pnp_drv->resume(pnp_dev);
195 if (error)
196 return error;
197 }
198
199 return 0;
200 }
201
202 struct bus_type pnp_bus_type = {
203 .name = "pnp",
204 .match = pnp_bus_match,
205 .probe = pnp_device_probe,
206 .remove = pnp_device_remove,
207 .suspend = pnp_bus_suspend,
208 .resume = pnp_bus_resume,
209 };
210
211 int pnp_register_driver(struct pnp_driver *drv)
212 {
213 pnp_dbg("the driver '%s' has been registered", drv->name);
214
215 drv->driver.name = drv->name;
216 drv->driver.bus = &pnp_bus_type;
217
218 return driver_register(&drv->driver);
219 }
220
221 void pnp_unregister_driver(struct pnp_driver *drv)
222 {
223 driver_unregister(&drv->driver);
224 pnp_dbg("the driver '%s' has been unregistered", drv->name);
225 }
226
227 /**
228 * pnp_add_id - adds an EISA id to the specified device
229 * @id: pointer to a pnp_id structure
230 * @dev: pointer to the desired device
231 */
232 int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
233 {
234 struct pnp_id *ptr;
235
236 id->next = NULL;
237 ptr = dev->id;
238 while (ptr && ptr->next)
239 ptr = ptr->next;
240 if (ptr)
241 ptr->next = id;
242 else
243 dev->id = id;
244 return 0;
245 }
246
247 EXPORT_SYMBOL(pnp_register_driver);
248 EXPORT_SYMBOL(pnp_unregister_driver);
249 EXPORT_SYMBOL(pnp_device_attach);
250 EXPORT_SYMBOL(pnp_device_detach);
251
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