xref: /linux/drivers/zorro/zorro-driver.c (revision a1ff5a7d78a036d6c2178ee5acd6ba4946243800)
1 /*
2  *  Zorro Driver Services
3  *
4  *  Copyright (C) 2003 Geert Uytterhoeven
5  *
6  *  Loosely based on drivers/pci/pci-driver.c
7  *
8  *  This file is subject to the terms and conditions of the GNU General Public
9  *  License.  See the file COPYING in the main directory of this archive
10  *  for more details.
11  */
12 
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/zorro.h>
16 
17 #include "zorro.h"
18 
19 
20     /**
21      *  zorro_match_device - Tell if a Zorro device structure has a matching
22      *                       Zorro device id structure
23      *  @ids: array of Zorro device id structures to search in
24      *  @dev: the Zorro device structure to match against
25      *
26      *  Used by a driver to check whether a Zorro device present in the
27      *  system is in its list of supported devices. Returns the matching
28      *  zorro_device_id structure or %NULL if there is no match.
29      */
30 
31 static const struct zorro_device_id *
zorro_match_device(const struct zorro_device_id * ids,const struct zorro_dev * z)32 zorro_match_device(const struct zorro_device_id *ids,
33 		   const struct zorro_dev *z)
34 {
35 	while (ids->id) {
36 		if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
37 			return ids;
38 		ids++;
39 	}
40 	return NULL;
41 }
42 
43 
zorro_device_probe(struct device * dev)44 static int zorro_device_probe(struct device *dev)
45 {
46 	int error = 0;
47 	struct zorro_driver *drv = to_zorro_driver(dev->driver);
48 	struct zorro_dev *z = to_zorro_dev(dev);
49 
50 	if (drv->probe) {
51 		const struct zorro_device_id *id;
52 
53 		id = zorro_match_device(drv->id_table, z);
54 		if (id)
55 			error = drv->probe(z, id);
56 		if (error >= 0)
57 			error = 0;
58 	}
59 	return error;
60 }
61 
62 
zorro_device_remove(struct device * dev)63 static void zorro_device_remove(struct device *dev)
64 {
65 	struct zorro_dev *z = to_zorro_dev(dev);
66 	struct zorro_driver *drv = to_zorro_driver(dev->driver);
67 
68 	if (drv->remove)
69 		drv->remove(z);
70 }
71 
72 
73     /**
74      *  zorro_register_driver - register a new Zorro driver
75      *  @drv: the driver structure to register
76      *
77      *  Adds the driver structure to the list of registered drivers
78      *  Returns zero or a negative error value.
79      */
80 
zorro_register_driver(struct zorro_driver * drv)81 int zorro_register_driver(struct zorro_driver *drv)
82 {
83 	/* initialize common driver fields */
84 	drv->driver.name = drv->name;
85 	drv->driver.bus = &zorro_bus_type;
86 
87 	/* register with core */
88 	return driver_register(&drv->driver);
89 }
90 EXPORT_SYMBOL(zorro_register_driver);
91 
92 
93     /**
94      *  zorro_unregister_driver - unregister a zorro driver
95      *  @drv: the driver structure to unregister
96      *
97      *  Deletes the driver structure from the list of registered Zorro drivers,
98      *  gives it a chance to clean up by calling its remove() function for
99      *  each device it was responsible for, and marks those devices as
100      *  driverless.
101      */
102 
zorro_unregister_driver(struct zorro_driver * drv)103 void zorro_unregister_driver(struct zorro_driver *drv)
104 {
105 	driver_unregister(&drv->driver);
106 }
107 EXPORT_SYMBOL(zorro_unregister_driver);
108 
109 
110     /**
111      *  zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
112      *                    device id structure
113      *  @ids: array of Zorro device id structures to search in
114      *  @dev: the Zorro device structure to match against
115      *
116      *  Used by the driver core to check whether a Zorro device present in the
117      *  system is in a driver's list of supported devices.  Returns 1 if
118      *  supported, and 0 if there is no match.
119      */
120 
zorro_bus_match(struct device * dev,const struct device_driver * drv)121 static int zorro_bus_match(struct device *dev, const struct device_driver *drv)
122 {
123 	struct zorro_dev *z = to_zorro_dev(dev);
124 	const struct zorro_driver *zorro_drv = to_zorro_driver(drv);
125 	const struct zorro_device_id *ids = zorro_drv->id_table;
126 
127 	if (!ids)
128 		return 0;
129 
130 	return !!zorro_match_device(ids, z);
131 }
132 
zorro_uevent(const struct device * dev,struct kobj_uevent_env * env)133 static int zorro_uevent(const struct device *dev, struct kobj_uevent_env *env)
134 {
135 	const struct zorro_dev *z;
136 
137 	if (!dev)
138 		return -ENODEV;
139 
140 	z = to_zorro_dev(dev);
141 	if (!z)
142 		return -ENODEV;
143 
144 	if (add_uevent_var(env, "ZORRO_ID=%08X", z->id) ||
145 	    add_uevent_var(env, "ZORRO_SLOT_NAME=%s", dev_name(dev)) ||
146 	    add_uevent_var(env, "ZORRO_SLOT_ADDR=%04X", z->slotaddr) ||
147 	    add_uevent_var(env, "MODALIAS=" ZORRO_DEVICE_MODALIAS_FMT, z->id))
148 		return -ENOMEM;
149 
150 	return 0;
151 }
152 
153 const struct bus_type zorro_bus_type = {
154 	.name		= "zorro",
155 	.dev_name	= "zorro",
156 	.dev_groups	= zorro_device_attribute_groups,
157 	.match		= zorro_bus_match,
158 	.uevent		= zorro_uevent,
159 	.probe		= zorro_device_probe,
160 	.remove		= zorro_device_remove,
161 };
162 EXPORT_SYMBOL(zorro_bus_type);
163 
164 
zorro_driver_init(void)165 static int __init zorro_driver_init(void)
166 {
167 	return bus_register(&zorro_bus_type);
168 }
169 
170 postcore_initcall(zorro_driver_init);
171 
172