1 | /* |
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2 | * Input/Output Manager - Dynamically Register Device Driver |
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3 | * |
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4 | * COPYRIGHT (c) 1989-2009. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #if HAVE_CONFIG_H |
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15 | #include "config.h" |
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16 | #endif |
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17 | |
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18 | #include <rtems/system.h> |
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19 | #include <rtems/io.h> |
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20 | |
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21 | /* |
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22 | * rtems_io_register_driver |
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23 | * |
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24 | * Register a driver into the device driver table. |
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25 | * |
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26 | * Input Paramters: |
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27 | * major - device major number (0 means allocate |
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28 | * a number) |
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29 | * driver_table - driver callout function table |
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30 | * registered_major - the major number which is registered |
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31 | * |
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32 | * Output Parameters: |
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33 | * RTEMS_SUCCESSFUL - if successful |
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34 | * error code - if unsuccessful |
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35 | */ |
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36 | |
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37 | rtems_status_code rtems_io_register_driver( |
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38 | rtems_device_major_number major, |
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39 | const rtems_driver_address_table *driver_table, |
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40 | rtems_device_major_number *registered_major |
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41 | ) |
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42 | { |
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43 | |
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44 | /* |
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45 | * Validate the pointer data and contents passed in |
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46 | */ |
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47 | if ( !driver_table ) |
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48 | return RTEMS_INVALID_ADDRESS; |
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49 | |
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50 | if ( !registered_major ) |
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51 | return RTEMS_INVALID_ADDRESS; |
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52 | |
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53 | if ( !driver_table->initialization_entry && !driver_table->open_entry ) |
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54 | return RTEMS_INVALID_ADDRESS; |
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55 | |
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56 | *registered_major = 0; |
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57 | |
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58 | /* |
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59 | * The requested major number is higher than what is configured. |
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60 | */ |
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61 | if ( major >= _IO_Number_of_drivers ) |
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62 | return RTEMS_INVALID_NUMBER; |
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63 | |
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64 | /* |
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65 | * Test for initialise/open being present to indicate the driver slot is |
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66 | * in use. |
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67 | */ |
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68 | |
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69 | if ( major == 0 ) { |
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70 | bool found = false; |
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71 | for ( major = _IO_Number_of_drivers - 1 ; major ; major-- ) { |
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72 | if ( !_IO_Driver_address_table[major].initialization_entry && |
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73 | !_IO_Driver_address_table[major].open_entry ) { |
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74 | found = true; |
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75 | break; |
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76 | } |
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77 | } |
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78 | |
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79 | if ( !found ) |
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80 | return RTEMS_TOO_MANY; |
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81 | } |
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82 | |
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83 | if ( _IO_Driver_address_table[major].initialization_entry || |
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84 | _IO_Driver_address_table[major].open_entry ) |
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85 | return RTEMS_RESOURCE_IN_USE; |
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86 | |
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87 | |
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88 | _IO_Driver_address_table[major] = *driver_table; |
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89 | *registered_major = major; |
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90 | |
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91 | return rtems_io_initialize( major, 0, NULL ); |
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92 | } |
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