blob: d3f869ee1d92a5b8e90919b6df880efb7ec73ee8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * driver.c - device id matching, driver model, etc.
3 *
4 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 */
6
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/string.h>
8#include <linux/list.h>
9#include <linux/module.h>
10#include <linux/ctype.h>
11#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/pnp.h>
13#include "base.h"
14
15static int compare_func(const char *ida, const char *idb)
16{
17 int i;
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -070018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 /* we only need to compare the last 4 chars */
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070020 for (i = 3; i < 7; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 if (ida[i] != 'X' &&
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070022 idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i]))
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 return 0;
24 }
25 return 1;
26}
27
28int compare_pnp_id(struct pnp_id *pos, const char *id)
29{
30 if (!pos || !id || (strlen(id) != 7))
31 return 0;
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070032 if (memcmp(id, "ANYDEVS", 7) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070033 return 1;
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070034 while (pos) {
35 if (memcmp(pos->id, id, 3) == 0)
36 if (compare_func(pos->id, id) == 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 return 1;
38 pos = pos->next;
39 }
40 return 0;
41}
42
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070043static const struct pnp_device_id *match_device(struct pnp_driver *drv,
44 struct pnp_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
46 const struct pnp_device_id *drv_id = drv->id_table;
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -070047
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 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
59int pnp_device_attach(struct pnp_dev *pnp_dev)
60{
61 spin_lock(&pnp_lock);
Bjorn Helgaas9dd78462007-07-26 10:41:20 -070062 if (pnp_dev->status != PNP_READY) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 spin_unlock(&pnp_lock);
64 return -EBUSY;
65 }
66 pnp_dev->status = PNP_ATTACHED;
67 spin_unlock(&pnp_lock);
68 return 0;
69}
70
71void 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
80static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 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)
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700100 == PNP_DRIVER_RES_DISABLE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 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 }
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700111 if (error >= 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 pnp_dev->driver = pnp_drv;
113 error = 0;
114 } else
115 goto fail;
Bjorn Helgaasa05d0782007-10-16 23:31:10 -0700116
117 dev_dbg(dev, "driver attached\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 return error;
119
Bjorn Helgaas1e0aa9a2007-08-15 10:32:08 -0600120fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 pnp_device_detach(pnp_dev);
122 return error;
123}
124
125static int pnp_device_remove(struct device *dev)
126{
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700127 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
128 struct pnp_driver *drv = pnp_dev->driver;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
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
139static int pnp_bus_match(struct device *dev, struct device_driver *drv)
140{
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700141 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
142 struct pnp_driver *pnp_drv = to_pnp_driver(drv);
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -0700143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 if (match_device(pnp_drv, pnp_dev) == NULL)
145 return 0;
146 return 1;
147}
148
Takashi Iwai4c98cfe2005-11-29 09:09:32 +0100149static int pnp_bus_suspend(struct device *dev, pm_message_t state)
150{
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700151 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
152 struct pnp_driver *pnp_drv = pnp_dev->driver;
Pierre Ossman68094e32005-11-29 09:09:32 +0100153 int error;
Takashi Iwai4c98cfe2005-11-29 09:09:32 +0100154
Pierre Ossman68094e32005-11-29 09:09:32 +0100155 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
Rene Herman5d389982008-02-06 01:40:05 -0800164 if (pnp_can_disable(pnp_dev)) {
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700165 error = pnp_stop_dev(pnp_dev);
166 if (error)
167 return error;
Pierre Ossman68094e32005-11-29 09:09:32 +0100168 }
169
Bjorn Helgaas0bc11fd2008-04-28 02:15:57 -0700170 if (pnp_dev->protocol->suspend)
Shaohua Lifc30e682007-07-20 10:03:20 +0800171 pnp_dev->protocol->suspend(pnp_dev, state);
Takashi Iwai4c98cfe2005-11-29 09:09:32 +0100172 return 0;
173}
174
Pierre Ossman68094e32005-11-29 09:09:32 +0100175static int pnp_bus_resume(struct device *dev)
Takashi Iwai4c98cfe2005-11-29 09:09:32 +0100176{
Bjorn Helgaas9dd78462007-07-26 10:41:20 -0700177 struct pnp_dev *pnp_dev = to_pnp_dev(dev);
178 struct pnp_driver *pnp_drv = pnp_dev->driver;
Pierre Ossman68094e32005-11-29 09:09:32 +0100179 int error;
Takashi Iwai4c98cfe2005-11-29 09:09:32 +0100180
Pierre Ossman68094e32005-11-29 09:09:32 +0100181 if (!pnp_drv)
182 return 0;
183
Bjorn Helgaas0bc11fd2008-04-28 02:15:57 -0700184 if (pnp_dev->protocol->resume)
Shaohua Lifc30e682007-07-20 10:03:20 +0800185 pnp_dev->protocol->resume(pnp_dev);
186
Rene Herman5d389982008-02-06 01:40:05 -0800187 if (pnp_can_write(pnp_dev)) {
Pierre Ossman68094e32005-11-29 09:09:32 +0100188 error = pnp_start_dev(pnp_dev);
189 if (error)
190 return error;
191 }
192
Rene Herman5d389982008-02-06 01:40:05 -0800193 if (pnp_drv->resume) {
194 error = pnp_drv->resume(pnp_dev);
195 if (error)
196 return error;
197 }
Pierre Ossman68094e32005-11-29 09:09:32 +0100198
199 return 0;
Takashi Iwai4c98cfe2005-11-29 09:09:32 +0100200}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202struct bus_type pnp_bus_type = {
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -0700203 .name = "pnp",
204 .match = pnp_bus_match,
205 .probe = pnp_device_probe,
206 .remove = pnp_device_remove,
Takashi Iwai4c98cfe2005-11-29 09:09:32 +0100207 .suspend = pnp_bus_suspend,
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -0700208 .resume = pnp_bus_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209};
210
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211int pnp_register_driver(struct pnp_driver *drv)
212{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 pnp_dbg("the driver '%s' has been registered", drv->name);
214
215 drv->driver.name = drv->name;
216 drv->driver.bus = &pnp_bus_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217
Bjorn Helgaas982c6092006-03-27 01:17:08 -0800218 return driver_register(&drv->driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
221void 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 * @dev: pointer to the desired device
Bjorn Helgaas772defc2008-04-28 16:33:52 -0600230 * @id: pointer to an EISA id string
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 */
Bjorn Helgaas772defc2008-04-28 16:33:52 -0600232struct pnp_id *pnp_add_id(struct pnp_dev *dev, char *id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233{
Bjorn Helgaas772defc2008-04-28 16:33:52 -0600234 struct pnp_id *dev_id, *ptr;
Bjorn Helgaas07d4e9a2007-07-26 10:41:21 -0700235
Bjorn Helgaas772defc2008-04-28 16:33:52 -0600236 dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
237 if (!dev_id)
238 return NULL;
239
240 dev_id->id[0] = id[0];
241 dev_id->id[1] = id[1];
242 dev_id->id[2] = id[2];
243 dev_id->id[3] = tolower(id[3]);
244 dev_id->id[4] = tolower(id[4]);
245 dev_id->id[5] = tolower(id[5]);
246 dev_id->id[6] = tolower(id[6]);
247 dev_id->id[7] = '\0';
248
249 dev_id->next = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 ptr = dev->id;
251 while (ptr && ptr->next)
252 ptr = ptr->next;
253 if (ptr)
Bjorn Helgaas772defc2008-04-28 16:33:52 -0600254 ptr->next = dev_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 else
Bjorn Helgaas772defc2008-04-28 16:33:52 -0600256 dev->id = dev_id;
257
258 return dev_id;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259}
260
261EXPORT_SYMBOL(pnp_register_driver);
262EXPORT_SYMBOL(pnp_unregister_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263EXPORT_SYMBOL(pnp_device_attach);
264EXPORT_SYMBOL(pnp_device_detach);