[go: nahoru, domu]
1/*
2 * ISA bus.
3 */
4
5#include <linux/device.h>
6#include <linux/kernel.h>
7#include <linux/slab.h>
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/dma-mapping.h>
11#include <linux/isa.h>
12
13static struct device isa_bus = {
14	.init_name	= "isa"
15};
16
17struct isa_dev {
18	struct device dev;
19	struct device *next;
20	unsigned int id;
21};
22
23#define to_isa_dev(x) container_of((x), struct isa_dev, dev)
24
25static int isa_bus_match(struct device *dev, struct device_driver *driver)
26{
27	struct isa_driver *isa_driver = to_isa_driver(driver);
28
29	if (dev->platform_data == isa_driver) {
30		if (!isa_driver->match ||
31			isa_driver->match(dev, to_isa_dev(dev)->id))
32			return 1;
33		dev->platform_data = NULL;
34	}
35	return 0;
36}
37
38static int isa_bus_probe(struct device *dev)
39{
40	struct isa_driver *isa_driver = dev->platform_data;
41
42	if (isa_driver->probe)
43		return isa_driver->probe(dev, to_isa_dev(dev)->id);
44
45	return 0;
46}
47
48static int isa_bus_remove(struct device *dev)
49{
50	struct isa_driver *isa_driver = dev->platform_data;
51
52	if (isa_driver->remove)
53		return isa_driver->remove(dev, to_isa_dev(dev)->id);
54
55	return 0;
56}
57
58static void isa_bus_shutdown(struct device *dev)
59{
60	struct isa_driver *isa_driver = dev->platform_data;
61
62	if (isa_driver->shutdown)
63		isa_driver->shutdown(dev, to_isa_dev(dev)->id);
64}
65
66static int isa_bus_suspend(struct device *dev, pm_message_t state)
67{
68	struct isa_driver *isa_driver = dev->platform_data;
69
70	if (isa_driver->suspend)
71		return isa_driver->suspend(dev, to_isa_dev(dev)->id, state);
72
73	return 0;
74}
75
76static int isa_bus_resume(struct device *dev)
77{
78	struct isa_driver *isa_driver = dev->platform_data;
79
80	if (isa_driver->resume)
81		return isa_driver->resume(dev, to_isa_dev(dev)->id);
82
83	return 0;
84}
85
86static struct bus_type isa_bus_type = {
87	.name		= "isa",
88	.match		= isa_bus_match,
89	.probe		= isa_bus_probe,
90	.remove		= isa_bus_remove,
91	.shutdown	= isa_bus_shutdown,
92	.suspend	= isa_bus_suspend,
93	.resume		= isa_bus_resume
94};
95
96static void isa_dev_release(struct device *dev)
97{
98	kfree(to_isa_dev(dev));
99}
100
101void isa_unregister_driver(struct isa_driver *isa_driver)
102{
103	struct device *dev = isa_driver->devices;
104
105	while (dev) {
106		struct device *tmp = to_isa_dev(dev)->next;
107		device_unregister(dev);
108		dev = tmp;
109	}
110	driver_unregister(&isa_driver->driver);
111}
112EXPORT_SYMBOL_GPL(isa_unregister_driver);
113
114int isa_register_driver(struct isa_driver *isa_driver, unsigned int ndev)
115{
116	int error;
117	unsigned int id;
118
119	isa_driver->driver.bus	= &isa_bus_type;
120	isa_driver->devices	= NULL;
121
122	error = driver_register(&isa_driver->driver);
123	if (error)
124		return error;
125
126	for (id = 0; id < ndev; id++) {
127		struct isa_dev *isa_dev;
128
129		isa_dev = kzalloc(sizeof *isa_dev, GFP_KERNEL);
130		if (!isa_dev) {
131			error = -ENOMEM;
132			break;
133		}
134
135		isa_dev->dev.parent	= &isa_bus;
136		isa_dev->dev.bus	= &isa_bus_type;
137
138		dev_set_name(&isa_dev->dev, "%s.%u",
139			     isa_driver->driver.name, id);
140		isa_dev->dev.platform_data	= isa_driver;
141		isa_dev->dev.release		= isa_dev_release;
142		isa_dev->id			= id;
143
144		isa_dev->dev.coherent_dma_mask = DMA_BIT_MASK(24);
145		isa_dev->dev.dma_mask = &isa_dev->dev.coherent_dma_mask;
146
147		error = device_register(&isa_dev->dev);
148		if (error) {
149			put_device(&isa_dev->dev);
150			break;
151		}
152
153		if (isa_dev->dev.platform_data) {
154			isa_dev->next = isa_driver->devices;
155			isa_driver->devices = &isa_dev->dev;
156		} else
157			device_unregister(&isa_dev->dev);
158	}
159
160	if (!error && !isa_driver->devices)
161		error = -ENODEV;
162
163	if (error)
164		isa_unregister_driver(isa_driver);
165
166	return error;
167}
168EXPORT_SYMBOL_GPL(isa_register_driver);
169
170static int __init isa_bus_init(void)
171{
172	int error;
173
174	error = bus_register(&isa_bus_type);
175	if (!error) {
176		error = device_register(&isa_bus);
177		if (error)
178			bus_unregister(&isa_bus_type);
179	}
180	return error;
181}
182
183device_initcall(isa_bus_init);
184