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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 455 | giacomo | 1 | /* |
| 2 | * driver.c - centralized device driver management |
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| 3 | * |
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| 4 | * Copyright (c) 2002-3 Patrick Mochel |
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| 5 | * Copyright (c) 2002-3 Open Source Development Labs |
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| 6 | * |
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| 7 | * This file is released under the GPLv2 |
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| 8 | * |
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| 9 | */ |
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| 10 | |||
| 11 | #undef DEBUG |
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| 12 | |||
| 13 | #include <linuxcomp.h> |
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| 14 | |||
| 15 | #include <linux/device.h> |
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| 16 | #include <linux/module.h> |
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| 17 | #include <linux/errno.h> |
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| 18 | #include <linux/string.h> |
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| 19 | #include "base.h" |
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| 20 | |||
| 21 | #define to_dev(node) container_of(node,struct device,driver_list) |
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| 22 | #define to_drv(obj) container_of(obj,struct device_driver,kobj) |
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| 23 | |||
| 24 | /** |
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| 25 | * driver_create_file - create sysfs file for driver. |
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| 26 | * @drv: driver. |
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| 27 | * @attr: driver attribute descriptor. |
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| 28 | */ |
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| 29 | |||
| 30 | int driver_create_file(struct device_driver * drv, struct driver_attribute * attr) |
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| 31 | { |
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| 32 | int error; |
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| 33 | if (get_driver(drv)) { |
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| 34 | error = 0;//sysfs_create_file(&drv->kobj,&attr->attr); |
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| 35 | put_driver(drv); |
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| 36 | } else |
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| 37 | error = -EINVAL; |
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| 38 | return error; |
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| 39 | } |
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| 40 | |||
| 41 | |||
| 42 | /** |
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| 43 | * driver_remove_file - remove sysfs file for driver. |
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| 44 | * @drv: driver. |
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| 45 | * @attr: driver attribute descriptor. |
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| 46 | */ |
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| 47 | |||
| 48 | void driver_remove_file(struct device_driver * drv, struct driver_attribute * attr) |
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| 49 | { |
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| 50 | if (get_driver(drv)) { |
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| 51 | //sysfs_remove_file(&drv->kobj,&attr->attr); |
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| 52 | put_driver(drv); |
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| 53 | } |
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| 54 | } |
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| 55 | |||
| 56 | |||
| 57 | /** |
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| 58 | * get_driver - increment driver reference count. |
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| 59 | * @drv: driver. |
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| 60 | */ |
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| 61 | struct device_driver * get_driver(struct device_driver * drv) |
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| 62 | { |
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| 63 | return drv ? to_drv(kobject_get(&drv->kobj)) : NULL; |
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| 64 | } |
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| 65 | |||
| 66 | |||
| 67 | /** |
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| 68 | * put_driver - decrement driver's refcount. |
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| 69 | * @drv: driver. |
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| 70 | */ |
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| 71 | void put_driver(struct device_driver * drv) |
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| 72 | { |
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| 73 | kobject_put(&drv->kobj); |
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| 74 | } |
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| 75 | |||
| 76 | |||
| 77 | /** |
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| 78 | * driver_register - register driver with bus |
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| 79 | * @drv: driver to register |
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| 80 | * |
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| 81 | * We pass off most of the work to the bus_add_driver() call, |
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| 82 | * since most of the things we have to do deal with the bus |
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| 83 | * structures. |
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| 84 | * |
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| 85 | * The one interesting aspect is that we initialize @drv->unload_sem |
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| 86 | * to a locked state here. It will be unlocked when the driver |
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| 87 | * reference count reaches 0. |
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| 88 | */ |
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| 89 | int driver_register(struct device_driver * drv) |
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| 90 | { |
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| 91 | INIT_LIST_HEAD(&drv->devices); |
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| 92 | //init_MUTEX_LOCKED(&drv->unload_sem); |
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| 93 | return bus_add_driver(drv); |
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| 94 | } |
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| 95 | |||
| 96 | |||
| 97 | /** |
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| 98 | * driver_unregister - remove driver from system. |
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| 99 | * @drv: driver. |
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| 100 | * |
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| 101 | * Again, we pass off most of the work to the bus-level call. |
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| 102 | * |
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| 103 | * Though, once that is done, we attempt to take @drv->unload_sem. |
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| 104 | * This will block until the driver refcount reaches 0, and it is |
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| 105 | * released. Only modular drivers will call this function, and we |
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| 106 | * have to guarantee that it won't complete, letting the driver |
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| 107 | * unload until all references are gone. |
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| 108 | */ |
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| 109 | |||
| 110 | void driver_unregister(struct device_driver * drv) |
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| 111 | { |
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| 112 | bus_remove_driver(drv); |
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| 113 | //down(&drv->unload_sem); |
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| 114 | //up(&drv->unload_sem); |
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| 115 | } |
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| 116 | |||
| 117 | EXPORT_SYMBOL(driver_register); |
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| 118 | EXPORT_SYMBOL(driver_unregister); |
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| 119 | EXPORT_SYMBOL(get_driver); |
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| 120 | EXPORT_SYMBOL(put_driver); |
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| 121 | |||
| 122 | EXPORT_SYMBOL(driver_create_file); |
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| 123 | EXPORT_SYMBOL(driver_remove_file); |