PM: Prevent waiting forever on asynchronous resume after abort
[linux-2.6.git] / drivers / base / isa.c
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
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
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
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
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
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
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
96 static void isa_dev_release(struct device *dev)
97 {
98         kfree(to_isa_dev(dev));
99 }
100
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
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
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);