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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 .bus_id = "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 snprintf(isa_dev->dev.bus_id, BUS_ID_SIZE, "%s.%u",
139 isa_driver->driver.name, id);
140
141 isa_dev->dev.platform_data = isa_driver;
142 isa_dev->dev.release = isa_dev_release;
143 isa_dev->id = id;
144
145 isa_dev->dev.coherent_dma_mask = DMA_24BIT_MASK;
146 isa_dev->dev.dma_mask = &isa_dev->dev.coherent_dma_mask;
147
148 error = device_register(&isa_dev->dev);
149 if (error) {
150 put_device(&isa_dev->dev);
151 break;
152 }
153
154 if (isa_dev->dev.platform_data) {
155 isa_dev->next = isa_driver->devices;
156 isa_driver->devices = &isa_dev->dev;
157 } else
158 device_unregister(&isa_dev->dev);
159 }
160
161 if (!error && !isa_driver->devices)
162 error = -ENODEV;
163
164 if (error)
165 isa_unregister_driver(isa_driver);
166
167 return error;
168}
169EXPORT_SYMBOL_GPL(isa_register_driver);
170
171static int __init isa_bus_init(void)
172{
173 int error;
174
175 error = bus_register(&isa_bus_type);
176 if (!error) {
177 error = device_register(&isa_bus);
178 if (error)
179 bus_unregister(&isa_bus_type);
180 }
181 return error;
182}
183
184device_initcall(isa_bus_init);
185
