summaryrefslogtreecommitdiffstats
path: root/drivers/pnp/driver.c
blob: 2fa64a6b25c86d7c69fc053999463c0b6ff3cda0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
/*
 * driver.c - device id matching, driver model, etc.
 *
 * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
 */

#include <linux/string.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/pnp.h>
#include "base.h"

static int compare_func(const char *ida, const char *idb)
{
	int i;

	/* we only need to compare the last 4 chars */
	for (i = 3; i < 7; i++) {
		if (ida[i] != 'X' &&
		    idb[i] != 'X' && toupper(ida[i]) != toupper(idb[i]))
			return 0;
	}
	return 1;
}

int compare_pnp_id(struct pnp_id *pos, const char *id)
{
	if (!pos || !id || (strlen(id) != 7))
		return 0;
	if (memcmp(id, "ANYDEVS", 7) == 0)
		return 1;
	while (pos) {
		if (memcmp(pos->id, id, 3) == 0)
			if (compare_func(pos->id, id) == 1)
				return 1;
		pos = pos->next;
	}
	return 0;
}

static const struct pnp_device_id *match_device(struct pnp_driver *drv,
						struct pnp_dev *dev)
{
	const struct pnp_device_id *drv_id = drv->id_table;

	if (!drv_id)
		return NULL;

	while (*drv_id->id) {
		if (compare_pnp_id(dev->id, drv_id->id))
			return drv_id;
		drv_id++;
	}
	return NULL;
}

int pnp_device_attach(struct pnp_dev *pnp_dev)
{
	spin_lock(&pnp_lock);
	if (pnp_dev->status != PNP_READY) {
		spin_unlock(&pnp_lock);
		return -EBUSY;
	}
	pnp_dev->status = PNP_ATTACHED;
	spin_unlock(&pnp_lock);
	return 0;
}

void pnp_device_detach(struct pnp_dev *pnp_dev)
{
	spin_lock(&pnp_lock);
	if (pnp_dev->status == PNP_ATTACHED)
		pnp_dev->status = PNP_READY;
	spin_unlock(&pnp_lock);
	pnp_disable_dev(pnp_dev);
}

static int pnp_device_probe(struct device *dev)
{
	int error;
	struct pnp_driver *pnp_drv;
	struct pnp_dev *pnp_dev;
	const struct pnp_device_id *dev_id = NULL;
	pnp_dev = to_pnp_dev(dev);
	pnp_drv = to_pnp_driver(dev->driver);

	pnp_dbg("match found with the PnP device '%s' and the driver '%s'",
		dev->bus_id, pnp_drv->name);

	error = pnp_device_attach(pnp_dev);
	if (error < 0)
		return error;

	if (pnp_dev->active == 0) {
		if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
			error = pnp_activate_dev(pnp_dev);
			if (error < 0)
				return error;
		}
	} else if ((pnp_drv->flags & PNP_DRIVER_RES_DISABLE)
		   == PNP_DRIVER_RES_DISABLE) {
		error = pnp_disable_dev(pnp_dev);
		if (error < 0)
			return error;
	}
	error = 0;
	if (pnp_drv->probe) {
		dev_id = match_device(pnp_drv, pnp_dev);
		if (dev_id != NULL)
			error = pnp_drv->probe(pnp_dev, dev_id);
	}
	if (error >= 0) {
		pnp_dev->driver = pnp_drv;
		error = 0;
	} else
		goto fail;
	return error;

fail:
	pnp_device_detach(pnp_dev);
	return error;
}

static int pnp_device_remove(struct device *dev)
{
	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
	struct pnp_driver *drv = pnp_dev->driver;

	if (drv) {
		if (drv->remove)
			drv->remove(pnp_dev);
		pnp_dev->driver = NULL;
	}
	pnp_device_detach(pnp_dev);
	return 0;
}

static int pnp_bus_match(struct device *dev, struct device_driver *drv)
{
	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
	struct pnp_driver *pnp_drv = to_pnp_driver(drv);

	if (match_device(pnp_drv, pnp_dev) == NULL)
		return 0;
	return 1;
}

static int pnp_bus_suspend(struct device *dev, pm_message_t state)
{
	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
	struct pnp_driver *pnp_drv = pnp_dev->driver;
	int error;

	if (!pnp_drv)
		return 0;

	if (pnp_drv->suspend) {
		error = pnp_drv->suspend(pnp_dev, state);
		if (error)
			return error;
	}

	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE) &&
	    pnp_can_disable(pnp_dev)) {
		error = pnp_stop_dev(pnp_dev);
		if (error)
			return error;
	}

	if (pnp_dev->protocol && pnp_dev->protocol->suspend)
		pnp_dev->protocol->suspend(pnp_dev, state);
	return 0;
}

static int pnp_bus_resume(struct device *dev)
{
	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
	struct pnp_driver *pnp_drv = pnp_dev->driver;
	int error;

	if (!pnp_drv)
		return 0;

	if (pnp_dev->protocol && pnp_dev->protocol->resume)
		pnp_dev->protocol->resume(pnp_dev);

	if (!(pnp_drv->flags & PNP_DRIVER_RES_DO_NOT_CHANGE)) {
		error = pnp_start_dev(pnp_dev);
		if (error)
			return error;
	}

	if (pnp_drv->resume)
		return pnp_drv->resume(pnp_dev);

	return 0;
}

struct bus_type pnp_bus_type = {
	.name    = "pnp",
	.match   = pnp_bus_match,
	.probe   = pnp_device_probe,
	.remove  = pnp_device_remove,
	.suspend = pnp_bus_suspend,
	.resume  = pnp_bus_resume,
};

int pnp_register_driver(struct pnp_driver *drv)
{
	pnp_dbg("the driver '%s' has been registered", drv->name);

	drv->driver.name = drv->name;
	drv->driver.bus = &pnp_bus_type;

	return driver_register(&drv->driver);
}

void pnp_unregister_driver(struct pnp_driver *drv)
{
	driver_unregister(&drv->driver);
	pnp_dbg("the driver '%s' has been unregistered", drv->name);
}

/**
 * pnp_add_id - adds an EISA id to the specified device
 * @id: pointer to a pnp_id structure
 * @dev: pointer to the desired device
 */
int pnp_add_id(struct pnp_id *id, struct pnp_dev *dev)
{
	struct pnp_id *ptr;

	id->next = NULL;
	ptr = dev->id;
	while (ptr && ptr->next)
		ptr = ptr->next;
	if (ptr)
		ptr->next = id;
	else
		dev->id = id;
	return 0;
}

EXPORT_SYMBOL(pnp_register_driver);
EXPORT_SYMBOL(pnp_unregister_driver);
EXPORT_SYMBOL(pnp_device_attach);
EXPORT_SYMBOL(pnp_device_detach);
OpenPOWER on IntegriCloud