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