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ec3d41c4 RR |
1 | #include <linux/virtio.h> |
2 | #include <linux/spinlock.h> | |
3 | #include <linux/virtio_config.h> | |
4 | ||
5 | static ssize_t device_show(struct device *_d, | |
6 | struct device_attribute *attr, char *buf) | |
7 | { | |
8 | struct virtio_device *dev = container_of(_d,struct virtio_device,dev); | |
9 | return sprintf(buf, "%hu", dev->id.device); | |
10 | } | |
11 | static ssize_t vendor_show(struct device *_d, | |
12 | struct device_attribute *attr, char *buf) | |
13 | { | |
14 | struct virtio_device *dev = container_of(_d,struct virtio_device,dev); | |
15 | return sprintf(buf, "%hu", dev->id.vendor); | |
16 | } | |
17 | static ssize_t status_show(struct device *_d, | |
18 | struct device_attribute *attr, char *buf) | |
19 | { | |
20 | struct virtio_device *dev = container_of(_d,struct virtio_device,dev); | |
21 | return sprintf(buf, "0x%08x", dev->config->get_status(dev)); | |
22 | } | |
b01d9f28 RR |
23 | static ssize_t modalias_show(struct device *_d, |
24 | struct device_attribute *attr, char *buf) | |
25 | { | |
26 | struct virtio_device *dev = container_of(_d,struct virtio_device,dev); | |
27 | ||
28 | return sprintf(buf, "virtio:d%08Xv%08X\n", | |
29 | dev->id.device, dev->id.vendor); | |
30 | } | |
ec3d41c4 RR |
31 | static struct device_attribute virtio_dev_attrs[] = { |
32 | __ATTR_RO(device), | |
33 | __ATTR_RO(vendor), | |
34 | __ATTR_RO(status), | |
b01d9f28 | 35 | __ATTR_RO(modalias), |
ec3d41c4 RR |
36 | __ATTR_NULL |
37 | }; | |
38 | ||
39 | static inline int virtio_id_match(const struct virtio_device *dev, | |
40 | const struct virtio_device_id *id) | |
41 | { | |
42 | if (id->device != dev->id.device) | |
43 | return 0; | |
44 | ||
45 | return id->vendor == VIRTIO_DEV_ANY_ID || id->vendor != dev->id.vendor; | |
46 | } | |
47 | ||
48 | /* This looks through all the IDs a driver claims to support. If any of them | |
49 | * match, we return 1 and the kernel will call virtio_dev_probe(). */ | |
50 | static int virtio_dev_match(struct device *_dv, struct device_driver *_dr) | |
51 | { | |
52 | unsigned int i; | |
53 | struct virtio_device *dev = container_of(_dv,struct virtio_device,dev); | |
54 | const struct virtio_device_id *ids; | |
55 | ||
56 | ids = container_of(_dr, struct virtio_driver, driver)->id_table; | |
57 | for (i = 0; ids[i].device; i++) | |
58 | if (virtio_id_match(dev, &ids[i])) | |
59 | return 1; | |
60 | return 0; | |
61 | } | |
62 | ||
b01d9f28 RR |
63 | static int virtio_uevent(struct device *_dv, struct kobj_uevent_env *env) |
64 | { | |
65 | struct virtio_device *dev = container_of(_dv,struct virtio_device,dev); | |
66 | ||
67 | return add_uevent_var(env, "MODALIAS=virtio:d%08Xv%08X", | |
68 | dev->id.device, dev->id.vendor); | |
69 | } | |
70 | ||
ec3d41c4 RR |
71 | static struct bus_type virtio_bus = { |
72 | .name = "virtio", | |
73 | .match = virtio_dev_match, | |
74 | .dev_attrs = virtio_dev_attrs, | |
b01d9f28 | 75 | .uevent = virtio_uevent, |
ec3d41c4 RR |
76 | }; |
77 | ||
78 | static void add_status(struct virtio_device *dev, unsigned status) | |
79 | { | |
80 | dev->config->set_status(dev, dev->config->get_status(dev) | status); | |
81 | } | |
82 | ||
83 | static int virtio_dev_probe(struct device *_d) | |
84 | { | |
85 | int err; | |
86 | struct virtio_device *dev = container_of(_d,struct virtio_device,dev); | |
87 | struct virtio_driver *drv = container_of(dev->dev.driver, | |
88 | struct virtio_driver, driver); | |
89 | ||
90 | add_status(dev, VIRTIO_CONFIG_S_DRIVER); | |
91 | err = drv->probe(dev); | |
92 | if (err) | |
93 | add_status(dev, VIRTIO_CONFIG_S_FAILED); | |
94 | else | |
95 | add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); | |
96 | return err; | |
97 | } | |
98 | ||
74b2553f RR |
99 | static int virtio_dev_remove(struct device *_d) |
100 | { | |
101 | struct virtio_device *dev = container_of(_d,struct virtio_device,dev); | |
102 | struct virtio_driver *drv = container_of(dev->dev.driver, | |
103 | struct virtio_driver, driver); | |
104 | ||
74b2553f | 105 | drv->remove(dev); |
6e5aa7ef RR |
106 | |
107 | /* Driver should have reset device. */ | |
108 | BUG_ON(dev->config->get_status(dev)); | |
109 | ||
110 | /* Acknowledge the device's existence again. */ | |
111 | add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE); | |
74b2553f RR |
112 | return 0; |
113 | } | |
114 | ||
ec3d41c4 RR |
115 | int register_virtio_driver(struct virtio_driver *driver) |
116 | { | |
117 | driver->driver.bus = &virtio_bus; | |
118 | driver->driver.probe = virtio_dev_probe; | |
74b2553f | 119 | driver->driver.remove = virtio_dev_remove; |
ec3d41c4 RR |
120 | return driver_register(&driver->driver); |
121 | } | |
122 | EXPORT_SYMBOL_GPL(register_virtio_driver); | |
123 | ||
124 | void unregister_virtio_driver(struct virtio_driver *driver) | |
125 | { | |
126 | driver_unregister(&driver->driver); | |
127 | } | |
128 | EXPORT_SYMBOL_GPL(unregister_virtio_driver); | |
129 | ||
130 | int register_virtio_device(struct virtio_device *dev) | |
131 | { | |
132 | int err; | |
133 | ||
134 | dev->dev.bus = &virtio_bus; | |
135 | sprintf(dev->dev.bus_id, "%u", dev->index); | |
136 | ||
6e5aa7ef RR |
137 | /* We always start by resetting the device, in case a previous |
138 | * driver messed it up. This also tests that code path a little. */ | |
139 | dev->config->reset(dev); | |
140 | ||
ec3d41c4 RR |
141 | /* Acknowledge that we've seen the device. */ |
142 | add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE); | |
143 | ||
144 | /* device_register() causes the bus infrastructure to look for a | |
145 | * matching driver. */ | |
146 | err = device_register(&dev->dev); | |
147 | if (err) | |
148 | add_status(dev, VIRTIO_CONFIG_S_FAILED); | |
149 | return err; | |
150 | } | |
151 | EXPORT_SYMBOL_GPL(register_virtio_device); | |
152 | ||
153 | void unregister_virtio_device(struct virtio_device *dev) | |
154 | { | |
155 | device_unregister(&dev->dev); | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(unregister_virtio_device); | |
158 | ||
ec3d41c4 RR |
159 | static int virtio_init(void) |
160 | { | |
161 | if (bus_register(&virtio_bus) != 0) | |
162 | panic("virtio bus registration failed"); | |
163 | return 0; | |
164 | } | |
165 | core_initcall(virtio_init); |