Merge tag 'gpio-v3.12-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[linux-2.6.git] / drivers / pnp / driver.c
bloba39ee38a9414cece2b0742e05f2cf5260a0fc842
1 /*
2 * driver.c - device id matching, driver model, etc.
4 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
5 */
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"
15 static int compare_func(const char *ida, const char *idb)
17 int i;
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;
25 return 1;
28 int compare_pnp_id(struct pnp_id *pos, const char *id)
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;
40 return 0;
43 static const struct pnp_device_id *match_device(struct pnp_driver *drv,
44 struct pnp_dev *dev)
46 const struct pnp_device_id *drv_id = drv->id_table;
48 if (!drv_id)
49 return NULL;
51 while (*drv_id->id) {
52 if (compare_pnp_id(dev->id, drv_id->id))
53 return drv_id;
54 drv_id++;
56 return NULL;
59 int pnp_device_attach(struct pnp_dev *pnp_dev)
61 spin_lock(&pnp_lock);
62 if (pnp_dev->status != PNP_READY) {
63 spin_unlock(&pnp_lock);
64 return -EBUSY;
66 pnp_dev->status = PNP_ATTACHED;
67 spin_unlock(&pnp_lock);
68 return 0;
71 void pnp_device_detach(struct pnp_dev *pnp_dev)
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);
80 static int pnp_device_probe(struct device *dev)
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);
89 error = pnp_device_attach(pnp_dev);
90 if (error < 0)
91 return error;
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;
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;
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);
111 if (error >= 0) {
112 pnp_dev->driver = pnp_drv;
113 error = 0;
114 } else
115 goto fail;
117 return error;
119 fail:
120 pnp_device_detach(pnp_dev);
121 return error;
124 static int pnp_device_remove(struct device *dev)
126 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
127 struct pnp_driver *drv = pnp_dev->driver;
129 if (drv) {
130 if (drv->remove)
131 drv->remove(pnp_dev);
132 pnp_dev->driver = NULL;
134 pnp_device_detach(pnp_dev);
135 return 0;
138 static void pnp_device_shutdown(struct device *dev)
140 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
141 struct pnp_driver *drv = pnp_dev->driver;
143 if (drv && drv->shutdown)
144 drv->shutdown(pnp_dev);
147 static int pnp_bus_match(struct device *dev, struct device_driver *drv)
149 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
150 struct pnp_driver *pnp_drv = to_pnp_driver(drv);
152 if (match_device(pnp_drv, pnp_dev) == NULL)
153 return 0;
154 return 1;
157 static int __pnp_bus_suspend(struct device *dev, pm_message_t state)
159 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
160 struct pnp_driver *pnp_drv = pnp_dev->driver;
161 int error;
163 if (!pnp_drv)
164 return 0;
166 if (pnp_drv->driver.pm && pnp_drv->driver.pm->suspend) {
167 error = pnp_drv->driver.pm->suspend(dev);
168 suspend_report_result(pnp_drv->driver.pm->suspend, error);
169 if (error)
170 return error;
173 if (pnp_drv->suspend) {
174 error = pnp_drv->suspend(pnp_dev, state);
175 if (error)
176 return error;
179 if (pnp_can_disable(pnp_dev)) {
180 error = pnp_stop_dev(pnp_dev);
181 if (error)
182 return error;
185 if (pnp_dev->protocol->suspend)
186 pnp_dev->protocol->suspend(pnp_dev, state);
187 return 0;
190 static int pnp_bus_suspend(struct device *dev)
192 return __pnp_bus_suspend(dev, PMSG_SUSPEND);
195 static int pnp_bus_freeze(struct device *dev)
197 return __pnp_bus_suspend(dev, PMSG_FREEZE);
200 static int pnp_bus_resume(struct device *dev)
202 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
203 struct pnp_driver *pnp_drv = pnp_dev->driver;
204 int error;
206 if (!pnp_drv)
207 return 0;
209 if (pnp_dev->protocol->resume) {
210 error = pnp_dev->protocol->resume(pnp_dev);
211 if (error)
212 return error;
215 if (pnp_can_write(pnp_dev)) {
216 error = pnp_start_dev(pnp_dev);
217 if (error)
218 return error;
221 if (pnp_drv->driver.pm && pnp_drv->driver.pm->resume) {
222 error = pnp_drv->driver.pm->resume(dev);
223 if (error)
224 return error;
227 if (pnp_drv->resume) {
228 error = pnp_drv->resume(pnp_dev);
229 if (error)
230 return error;
233 return 0;
236 static const struct dev_pm_ops pnp_bus_dev_pm_ops = {
237 .suspend = pnp_bus_suspend,
238 .freeze = pnp_bus_freeze,
239 .resume = pnp_bus_resume,
242 struct bus_type pnp_bus_type = {
243 .name = "pnp",
244 .match = pnp_bus_match,
245 .probe = pnp_device_probe,
246 .remove = pnp_device_remove,
247 .shutdown = pnp_device_shutdown,
248 .pm = &pnp_bus_dev_pm_ops,
249 .dev_attrs = pnp_interface_attrs,
252 int pnp_register_driver(struct pnp_driver *drv)
254 drv->driver.name = drv->name;
255 drv->driver.bus = &pnp_bus_type;
257 return driver_register(&drv->driver);
260 void pnp_unregister_driver(struct pnp_driver *drv)
262 driver_unregister(&drv->driver);
266 * pnp_add_id - adds an EISA id to the specified device
267 * @dev: pointer to the desired device
268 * @id: pointer to an EISA id string
270 struct pnp_id *pnp_add_id(struct pnp_dev *dev, const char *id)
272 struct pnp_id *dev_id, *ptr;
274 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
275 if (!dev_id)
276 return NULL;
278 dev_id->id[0] = id[0];
279 dev_id->id[1] = id[1];
280 dev_id->id[2] = id[2];
281 dev_id->id[3] = tolower(id[3]);
282 dev_id->id[4] = tolower(id[4]);
283 dev_id->id[5] = tolower(id[5]);
284 dev_id->id[6] = tolower(id[6]);
285 dev_id->id[7] = '\0';
287 dev_id->next = NULL;
288 ptr = dev->id;
289 while (ptr && ptr->next)
290 ptr = ptr->next;
291 if (ptr)
292 ptr->next = dev_id;
293 else
294 dev->id = dev_id;
296 return dev_id;
299 EXPORT_SYMBOL(pnp_register_driver);
300 EXPORT_SYMBOL(pnp_unregister_driver);
301 EXPORT_SYMBOL(pnp_device_attach);
302 EXPORT_SYMBOL(pnp_device_detach);