1/*
2 * driver.c - device id matching, driver model, etc.
3 *
4 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
5 *
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
16static int compare_func(const char *ida, const char *idb)
17{
18	int i;
19	/* we only need to compare the last 4 chars */
20	for (i=3; i<7; i++)
21	{
22		if (ida[i] != 'X' &&
23		    idb[i] != 'X' &&
24		    toupper(ida[i]) != toupper(idb[i]))
25			return 0;
26	}
27	return 1;
28}
29
30int compare_pnp_id(struct pnp_id *pos, const char *id)
31{
32	if (!pos || !id || (strlen(id) != 7))
33		return 0;
34	if (memcmp(id,"ANYDEVS",7)==0)
35		return 1;
36	while (pos){
37		if (memcmp(pos->id,id,3)==0)
38			if (compare_func(pos->id,id)==1)
39				return 1;
40		pos = pos->next;
41	}
42	return 0;
43}
44
45static const struct pnp_device_id * match_device(struct pnp_driver *drv, struct pnp_dev *dev)
46{
47	const struct pnp_device_id *drv_id = drv->id_table;
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
59int 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
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
89	pnp_dbg("match found with the PnP device '%s' and the driver '%s'", dev->bus_id,pnp_drv->name);
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	return error;
119
120fail:
121	pnp_device_detach(pnp_dev);
122	return error;
123}
124
125static 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
139static 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	if (match_device(pnp_drv, pnp_dev) == NULL)
144		return 0;
145	return 1;
146}
147
148static int pnp_bus_suspend(struct device *dev, pm_message_t state)
149{
150	struct pnp_dev * pnp_dev = to_pnp_dev(dev);
151	struct pnp_driver * pnp_drv = pnp_dev->driver;
152	int error;
153
154	if (!pnp_drv)
155		return 0;
156
157	if (pnp_drv->suspend) {
158		error = pnp_drv->suspend(pnp_dev, state);
159		if (error)
160			return error;
161	}
162
163	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) &&
164	    pnp_can_disable(pnp_dev)) {
165	    	error = pnp_stop_dev(pnp_dev);
166	    	if (error)
167	    		return error;
168	}
169
170	return 0;
171}
172
173static int pnp_bus_resume(struct device *dev)
174{
175	struct pnp_dev * pnp_dev = to_pnp_dev(dev);
176	struct pnp_driver * pnp_drv = pnp_dev->driver;
177	int error;
178
179	if (!pnp_drv)
180		return 0;
181
182	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
183		error = pnp_start_dev(pnp_dev);
184		if (error)
185			return error;
186	}
187
188	if (pnp_drv->resume)
189		return pnp_drv->resume(pnp_dev);
190
191	return 0;
192}
193
194struct bus_type pnp_bus_type = {
195	.name	= "pnp",
196	.match	= pnp_bus_match,
197	.probe	= pnp_device_probe,
198	.remove	= pnp_device_remove,
199	.suspend = pnp_bus_suspend,
200	.resume = pnp_bus_resume,
201};
202
203int pnp_register_driver(struct pnp_driver *drv)
204{
205	pnp_dbg("the driver '%s' has been registered", drv->name);
206
207	drv->driver.name = drv->name;
208	drv->driver.bus = &pnp_bus_type;
209
210	return driver_register(&drv->driver);
211}
212
213void pnp_unregister_driver(struct pnp_driver *drv)
214{
215	driver_unregister(&drv->driver);
216	pnp_dbg("the driver '%s' has been unregistered", drv->name);
217}
218
219/**
220 * pnp_add_id - adds an EISA id to the specified device
221 * @id: pointer to a pnp_id structure
222 * @dev: pointer to the desired device
223 *
224 */
225
226int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
227{
228	struct pnp_id *ptr;
229	if (!id)
230		return -EINVAL;
231	if (!dev)
232		return -EINVAL;
233	id->next = NULL;
234	ptr = dev->id;
235	while (ptr && ptr->next)
236		ptr = ptr->next;
237	if (ptr)
238		ptr->next = id;
239	else
240		dev->id = id;
241	return 0;
242}
243
244EXPORT_SYMBOL(pnp_register_driver);
245EXPORT_SYMBOL(pnp_unregister_driver);
246EXPORT_SYMBOL(pnp_device_attach);
247EXPORT_SYMBOL(pnp_device_detach);
248