1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * driver.c - device id matching, driver model, etc.
4 *
5 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
6 */
7
8 #include <linux/string.h>
9 #include <linux/list.h>
10 #include <linux/module.h>
11 #include <linux/ctype.h>
12 #include <linux/slab.h>
13 #include <linux/pnp.h>
14 #include "base.h"
15
compare_func(const char * ida,const char * idb)16 static int compare_func(const char *ida, const char *idb)
17 {
18 int i;
19
20 /* we only need to compare the last 4 chars */
21 for (i = 3; i < 7; i++) {
22 if (ida[i] != 'X' &&
23 idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i]))
24 return 0;
25 }
26 return 1;
27 }
28
compare_pnp_id(struct pnp_id * pos,const char * id)29 int compare_pnp_id(struct pnp_id *pos, const char *id)
30 {
31 if (!pos || !id || (strlen(id) != 7))
32 return 0;
33 if (memcmp(id, "ANYDEVS", 7) == 0)
34 return 1;
35 while (pos) {
36 if (memcmp(pos->id, id, 3) == 0)
37 if (compare_func(pos->id, id) == 1)
38 return 1;
39 pos = pos->next;
40 }
41 return 0;
42 }
43
match_device(const struct pnp_driver * drv,struct pnp_dev * dev)44 static const struct pnp_device_id *match_device(const struct pnp_driver *drv,
45 struct pnp_dev *dev)
46 {
47 const struct pnp_device_id *drv_id = drv->id_table;
48
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
pnp_device_attach(struct pnp_dev * pnp_dev)60 int pnp_device_attach(struct pnp_dev *pnp_dev)
61 {
62 mutex_lock(&pnp_lock);
63 if (pnp_dev->status != PNP_READY) {
64 mutex_unlock(&pnp_lock);
65 return -EBUSY;
66 }
67 pnp_dev->status = PNP_ATTACHED;
68 mutex_unlock(&pnp_lock);
69 return 0;
70 }
71 EXPORT_SYMBOL(pnp_device_attach);
72
pnp_device_detach(struct pnp_dev * pnp_dev)73 void pnp_device_detach(struct pnp_dev *pnp_dev)
74 {
75 mutex_lock(&pnp_lock);
76 if (pnp_dev->status == PNP_ATTACHED)
77 pnp_dev->status = PNP_READY;
78 mutex_unlock(&pnp_lock);
79 }
80 EXPORT_SYMBOL(pnp_device_detach);
81
pnp_device_probe(struct device * dev)82 static int pnp_device_probe(struct device *dev)
83 {
84 int error;
85 struct pnp_driver *pnp_drv;
86 struct pnp_dev *pnp_dev;
87 const struct pnp_device_id *dev_id = NULL;
88 pnp_dev = to_pnp_dev(dev);
89 pnp_drv = to_pnp_driver(dev->driver);
90
91 error = pnp_device_attach(pnp_dev);
92 if (error < 0)
93 return error;
94
95 if (pnp_dev->active == 0) {
96 if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
97 error = pnp_activate_dev(pnp_dev);
98 if (error < 0)
99 return error;
100 }
101 } else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
102 == PNP_DRIVER_RES_DISABLE) {
103 error = pnp_disable_dev(pnp_dev);
104 if (error < 0)
105 return error;
106 }
107 error = 0;
108 if (pnp_drv->probe) {
109 dev_id = match_device(pnp_drv, pnp_dev);
110 if (dev_id != NULL)
111 error = pnp_drv->probe(pnp_dev, dev_id);
112 }
113 if (error >= 0) {
114 pnp_dev->driver = pnp_drv;
115 error = 0;
116 } else
117 goto fail;
118
119 return error;
120
121 fail:
122 pnp_device_detach(pnp_dev);
123 return error;
124 }
125
pnp_device_remove(struct device * dev)126 static void 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
137 if (pnp_dev->active &&
138 (!drv || !(drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)))
139 pnp_disable_dev(pnp_dev);
140
141 pnp_device_detach(pnp_dev);
142 }
143
pnp_device_shutdown(struct device * dev)144 static void pnp_device_shutdown(struct device *dev)
145 {
146 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
147 struct pnp_driver *drv = pnp_dev->driver;
148
149 if (drv && drv->shutdown)
150 drv->shutdown(pnp_dev);
151 }
152
pnp_bus_match(struct device * dev,const struct device_driver * drv)153 static int pnp_bus_match(struct device *dev, const struct device_driver *drv)
154 {
155 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
156 const struct pnp_driver *pnp_drv = to_pnp_driver(drv);
157
158 if (match_device(pnp_drv, pnp_dev) == NULL)
159 return 0;
160 return 1;
161 }
162
__pnp_bus_suspend(struct device * dev,pm_message_t state)163 static int __pnp_bus_suspend(struct device *dev, pm_message_t state)
164 {
165 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
166 struct pnp_driver *pnp_drv = pnp_dev->driver;
167 int error;
168
169 if (!pnp_drv)
170 return 0;
171
172 if (pnp_drv->driver.pm && pnp_drv->driver.pm->suspend) {
173 error = pnp_drv->driver.pm->suspend(dev);
174 suspend_report_result(dev, pnp_drv->driver.pm->suspend, error);
175 if (error)
176 return error;
177 }
178
179 if (pnp_drv->suspend) {
180 error = pnp_drv->suspend(pnp_dev, state);
181 if (error)
182 return error;
183 }
184
185 /* can_write is necessary to be able to re-start the device on resume */
186 if (pnp_can_disable(pnp_dev) && pnp_can_write(pnp_dev)) {
187 error = pnp_stop_dev(pnp_dev);
188 if (error)
189 return error;
190 }
191
192 if (pnp_can_suspend(pnp_dev))
193 pnp_dev->protocol->suspend(pnp_dev, state);
194 return 0;
195 }
196
pnp_bus_suspend(struct device * dev)197 static int pnp_bus_suspend(struct device *dev)
198 {
199 return __pnp_bus_suspend(dev, PMSG_SUSPEND);
200 }
201
pnp_bus_freeze(struct device * dev)202 static int pnp_bus_freeze(struct device *dev)
203 {
204 return __pnp_bus_suspend(dev, PMSG_FREEZE);
205 }
206
pnp_bus_poweroff(struct device * dev)207 static int pnp_bus_poweroff(struct device *dev)
208 {
209 return __pnp_bus_suspend(dev, PMSG_HIBERNATE);
210 }
211
pnp_bus_resume(struct device * dev)212 static int pnp_bus_resume(struct device *dev)
213 {
214 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
215 struct pnp_driver *pnp_drv = pnp_dev->driver;
216 int error;
217
218 if (!pnp_drv)
219 return 0;
220
221 if (pnp_dev->protocol->resume) {
222 error = pnp_dev->protocol->resume(pnp_dev);
223 if (error)
224 return error;
225 }
226
227 if (pnp_can_write(pnp_dev)) {
228 error = pnp_start_dev(pnp_dev);
229 if (error)
230 return error;
231 }
232
233 if (pnp_drv->driver.pm && pnp_drv->driver.pm->resume) {
234 error = pnp_drv->driver.pm->resume(dev);
235 if (error)
236 return error;
237 }
238
239 if (pnp_drv->resume) {
240 error = pnp_drv->resume(pnp_dev);
241 if (error)
242 return error;
243 }
244
245 return 0;
246 }
247
248 static const struct dev_pm_ops pnp_bus_dev_pm_ops = {
249 /* Suspend callbacks */
250 .suspend = pnp_bus_suspend,
251 .resume = pnp_bus_resume,
252 /* Hibernate callbacks */
253 .freeze = pnp_bus_freeze,
254 .thaw = pnp_bus_resume,
255 .poweroff = pnp_bus_poweroff,
256 .restore = pnp_bus_resume,
257 };
258
259 const struct bus_type pnp_bus_type = {
260 .name = "pnp",
261 .match = pnp_bus_match,
262 .probe = pnp_device_probe,
263 .remove = pnp_device_remove,
264 .shutdown = pnp_device_shutdown,
265 .pm = &pnp_bus_dev_pm_ops,
266 .dev_groups = pnp_dev_groups,
267 };
268
dev_is_pnp(const struct device * dev)269 bool dev_is_pnp(const struct device *dev)
270 {
271 return dev->bus == &pnp_bus_type;
272 }
273 EXPORT_SYMBOL_GPL(dev_is_pnp);
274
pnp_register_driver(struct pnp_driver * drv)275 int pnp_register_driver(struct pnp_driver *drv)
276 {
277 drv->driver.name = drv->name;
278 drv->driver.bus = &pnp_bus_type;
279
280 return driver_register(&drv->driver);
281 }
282 EXPORT_SYMBOL(pnp_register_driver);
283
pnp_unregister_driver(struct pnp_driver * drv)284 void pnp_unregister_driver(struct pnp_driver *drv)
285 {
286 driver_unregister(&drv->driver);
287 }
288 EXPORT_SYMBOL(pnp_unregister_driver);
289
290 /**
291 * pnp_add_id - adds an EISA id to the specified device
292 * @dev: pointer to the desired device
293 * @id: pointer to an EISA id string
294 */
pnp_add_id(struct pnp_dev * dev,const char * id)295 struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id)
296 {
297 struct pnp_id *dev_id, *ptr;
298
299 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
300 if (!dev_id)
301 return NULL;
302
303 dev_id->id[0] = id[0];
304 dev_id->id[1] = id[1];
305 dev_id->id[2] = id[2];
306 dev_id->id[3] = tolower(id[3]);
307 dev_id->id[4] = tolower(id[4]);
308 dev_id->id[5] = tolower(id[5]);
309 dev_id->id[6] = tolower(id[6]);
310 dev_id->id[7] = '\0';
311
312 dev_id->next = NULL;
313 ptr = dev->id;
314 while (ptr && ptr->next)
315 ptr = ptr->next;
316 if (ptr)
317 ptr->next = dev_id;
318 else
319 dev->id = dev_id;
320
321 return dev_id;
322 }
323