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
13 static struct device isa_bus = {
14 .init_name = "isa"
15 };
16
17 struct 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
isa_bus_match(struct device * dev,struct device_driver * driver)25 static 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
isa_bus_probe(struct device * dev)38 static 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
isa_bus_remove(struct device * dev)48 static 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
isa_bus_shutdown(struct device * dev)58 static 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
isa_bus_suspend(struct device * dev,pm_message_t state)66 static 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
isa_bus_resume(struct device * dev)76 static 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
86 static 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
isa_dev_release(struct device * dev)96 static void isa_dev_release(struct device *dev)
97 {
98 kfree(to_isa_dev(dev));
99 }
100
isa_unregister_driver(struct isa_driver * isa_driver)101 void 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 }
112 EXPORT_SYMBOL_GPL(isa_unregister_driver);
113
isa_register_driver(struct isa_driver * isa_driver,unsigned int ndev)114 int 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 }
168 EXPORT_SYMBOL_GPL(isa_register_driver);
169
isa_bus_init(void)170 static 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
183 device_initcall(isa_bus_init);
184