blob: 4c57e3fbf7a78935400f72450ae1057b2b2d2d5e (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*
* Input/Output Manager - Dynamically Register Device Driver
*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/io.h>
/*
* rtems_io_register_driver
*
* Register a driver into the device driver table.
*
* Input Paramters:
* major - device major number (0 means allocate
* a number)
* driver_table - driver callout function table
* registered_major - the major number which is registered
*
* Output Parameters:
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
rtems_status_code rtems_io_register_driver(
rtems_device_major_number major,
rtems_driver_address_table *driver_table,
rtems_device_major_number *registered_major
)
{
/*
* Validate the pointer data and contents passed in
*/
if ( !driver_table )
return RTEMS_INVALID_ADDRESS;
if ( !registered_major )
return RTEMS_INVALID_ADDRESS;
if ( !driver_table->initialization_entry && !driver_table->open_entry )
return RTEMS_INVALID_ADDRESS;
*registered_major = 0;
/*
* The requested major number is higher than what is configured.
*/
if ( major >= _IO_Number_of_drivers )
return RTEMS_INVALID_NUMBER;
/*
* Test for initialise/open being present to indicate the driver slot is
* in use.
*/
if ( major == 0 ) {
boolean found = FALSE;
for ( major = _IO_Number_of_drivers - 1 ; major ; major-- ) {
if ( !_IO_Driver_address_table[major].initialization_entry &&
!_IO_Driver_address_table[major].open_entry ) {
found = TRUE;
break;
}
}
if ( !found )
return RTEMS_TOO_MANY;
}
if ( _IO_Driver_address_table[major].initialization_entry ||
_IO_Driver_address_table[major].open_entry )
return RTEMS_RESOURCE_IN_USE;
_IO_Driver_address_table[major] = *driver_table;
*registered_major = major;
return rtems_io_initialize( major, 0, NULL );
}
|
