Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp.
3 * <benh@kernel.crashing.org>
4 * and Arnd Bergmann, IBM Corp.
5 * Merged from powerpc/kernel/of_platform.c and
6 * sparc{,64}/kernel/of_device.c by Stephen Rothwell
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
12 *
13 */
14#include <linux/errno.h>
15#include <linux/module.h>
16#include <linux/device.h>
17#include <linux/of_device.h>
18#include <linux/of_platform.h>
19
20extern struct device_attribute of_platform_device_attrs[];
21
22static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
23{
24 struct of_device *of_dev = to_of_device(dev);
25 struct of_platform_driver *of_drv = to_of_platform_driver(drv);
26 const struct of_device_id *matches = of_drv->match_table;
27
28 if (!matches)
29 return 0;
30
31 return of_match_device(matches, of_dev) != NULL;
32}
33
34static int of_platform_device_probe(struct device *dev)
35{
36 int error = -ENODEV;
37 struct of_platform_driver *drv;
38 struct of_device *of_dev;
39 const struct of_device_id *match;
40
41 drv = to_of_platform_driver(dev->driver);
42 of_dev = to_of_device(dev);
43
44 if (!drv->probe)
45 return error;
46
47 of_dev_get(of_dev);
48
49 match = of_match_device(drv->match_table, of_dev);
50 if (match)
51 error = drv->probe(of_dev, match);
52 if (error)
53 of_dev_put(of_dev);
54
55 return error;
56}
57
58static int of_platform_device_remove(struct device *dev)
59{
60 struct of_device *of_dev = to_of_device(dev);
61 struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
62
63 if (dev->driver && drv->remove)
64 drv->remove(of_dev);
65 return 0;
66}
67
68static int of_platform_device_suspend(struct device *dev, pm_message_t state)
69{
70 struct of_device *of_dev = to_of_device(dev);
71 struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
72 int error = 0;
73
74 if (dev->driver && drv->suspend)
75 error = drv->suspend(of_dev, state);
76 return error;
77}
78
79static int of_platform_device_resume(struct device * dev)
80{
81 struct of_device *of_dev = to_of_device(dev);
82 struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
83 int error = 0;
84
85 if (dev->driver && drv->resume)
86 error = drv->resume(of_dev);
87 return error;
88}
89
90static void of_platform_device_shutdown(struct device *dev)
91{
92 struct of_device *of_dev = to_of_device(dev);
93 struct of_platform_driver *drv = to_of_platform_driver(dev->driver);
94
95 if (dev->driver && drv->shutdown)
96 drv->shutdown(of_dev);
97}
98
99int of_bus_type_init(struct bus_type *bus, const char *name)
100{
101 bus->name = name;
102 bus->match = of_platform_bus_match;
103 bus->probe = of_platform_device_probe;
104 bus->remove = of_platform_device_remove;
105 bus->suspend = of_platform_device_suspend;
106 bus->resume = of_platform_device_resume;
107 bus->shutdown = of_platform_device_shutdown;
108 bus->dev_attrs = of_platform_device_attrs;
109 return bus_register(bus);
110}
111
112int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
113{
114 /* initialize common driver fields */
115 if (!drv->driver.name)
116 drv->driver.name = drv->name;
117 if (!drv->driver.owner)
118 drv->driver.owner = drv->owner;
119 drv->driver.bus = bus;
120
121 /* register with core */
122 return driver_register(&drv->driver);
123}
124EXPORT_SYMBOL(of_register_driver);
125
126void of_unregister_driver(struct of_platform_driver *drv)
127{
128 driver_unregister(&drv->driver);
129}
130EXPORT_SYMBOL(of_unregister_driver);