1 | /** |
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2 | * @file rtems/io.h |
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3 | * |
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4 | * This include file contains all the constants and structures associated |
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5 | * with the Input/Output Manager. This manager provides a well defined |
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6 | * mechanism for accessing device drivers and a structured methodology for |
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7 | * organizing device drivers. |
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8 | * |
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9 | * Directives provided are: |
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10 | * |
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11 | * + initialize a device driver |
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12 | * + open a device driver |
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13 | * + close a device driver |
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14 | * + read from a device driver |
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15 | * + write to a device driver |
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16 | * + special device services |
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17 | */ |
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18 | |
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19 | /* |
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20 | * COPYRIGHT (c) 1989-1999. |
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21 | * On-Line Applications Research Corporation (OAR). |
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22 | * |
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23 | * The license and distribution terms for this file may be |
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24 | * found in the file LICENSE in this distribution or at |
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25 | * http://www.rtems.com/license/LICENSE. |
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26 | * |
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27 | * $Id$ |
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28 | */ |
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29 | |
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30 | #ifndef __RTEMS_IO_h |
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31 | #define __RTEMS_IO_h |
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32 | |
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33 | #ifdef __cplusplus |
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34 | extern "C" { |
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35 | #endif |
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36 | |
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37 | #include <rtems/rtems/status.h> |
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38 | |
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39 | /* |
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40 | * |
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41 | * The following defines the types for: |
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42 | * |
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43 | * + major and minor numbers |
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44 | * + the return type of a device driver entry |
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45 | * + a pointer to a device driver entry |
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46 | * + an entry in the the Device Driver Address Table. Each entry in this |
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47 | * table corresponds to an application provided device driver and |
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48 | * defines the entry points for that device driver. |
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49 | */ |
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50 | |
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51 | typedef uint32_t rtems_device_major_number; |
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52 | typedef uint32_t rtems_device_minor_number; |
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53 | |
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54 | typedef rtems_status_code rtems_device_driver; |
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55 | |
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56 | typedef rtems_device_driver ( *rtems_device_driver_entry )( |
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57 | rtems_device_major_number, |
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58 | rtems_device_minor_number, |
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59 | void * |
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60 | ); |
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61 | |
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62 | typedef struct { |
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63 | rtems_device_driver_entry initialization_entry; /* initialization procedure */ |
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64 | rtems_device_driver_entry open_entry; /* open request procedure */ |
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65 | rtems_device_driver_entry close_entry; /* close request procedure */ |
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66 | rtems_device_driver_entry read_entry; /* read request procedure */ |
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67 | rtems_device_driver_entry write_entry; /* write request procedure */ |
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68 | rtems_device_driver_entry control_entry; /* special functions procedure */ |
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69 | } rtems_driver_address_table; |
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70 | |
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71 | /* |
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72 | * Table for the io device names |
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73 | */ |
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74 | |
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75 | typedef struct { |
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76 | char *device_name; |
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77 | size_t device_name_length; |
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78 | rtems_device_major_number major; |
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79 | rtems_device_minor_number minor; |
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80 | } rtems_driver_name_t; |
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81 | |
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82 | /* |
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83 | * This is the table of device names. |
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84 | */ |
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85 | |
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86 | /* |
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87 | * The following declare the data required to manage the Driver |
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88 | * Address Table and Device Name Table. |
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89 | */ |
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90 | |
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91 | SAPI_EXTERN uint32_t _IO_Number_of_drivers; |
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92 | SAPI_EXTERN rtems_driver_address_table *_IO_Driver_address_table; |
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93 | SAPI_EXTERN uint32_t _IO_Number_of_devices; |
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94 | SAPI_EXTERN rtems_driver_name_t *_IO_Driver_name_table; |
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95 | |
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96 | /* |
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97 | * _IO_Manager_initialization |
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98 | * |
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99 | * DESCRIPTION: |
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100 | * |
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101 | * This routine performs the initialization necessary for this manager. |
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102 | */ |
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103 | |
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104 | void _IO_Manager_initialization( |
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105 | rtems_driver_address_table *driver_table, |
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106 | uint32_t drivers_in_table, |
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107 | uint32_t number_of_drivers, |
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108 | uint32_t number_of_devices |
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109 | ); |
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110 | |
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111 | /* |
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112 | * rtems_io_register_driver |
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113 | * |
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114 | * DESCRIPTION: |
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115 | * |
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116 | * Register a driver into the device driver table. |
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117 | * |
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118 | */ |
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119 | |
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120 | rtems_status_code rtems_io_register_driver( |
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121 | rtems_device_major_number major, |
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122 | rtems_driver_address_table *driver_table, |
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123 | rtems_device_major_number *registered_major |
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124 | ); |
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125 | |
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126 | /* |
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127 | * rtems_io_unregister_driver |
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128 | * |
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129 | * DESCRIPTION: |
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130 | * |
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131 | * Unregister a driver from the device driver table. |
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132 | * |
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133 | */ |
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134 | |
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135 | rtems_status_code rtems_io_unregister_driver( |
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136 | rtems_device_major_number major |
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137 | ); |
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138 | |
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139 | /* |
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140 | * rtems_io_register_name |
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141 | * |
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142 | * DESCRIPTION: |
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143 | * |
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144 | * Associate a name with a driver. |
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145 | * |
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146 | */ |
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147 | |
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148 | rtems_status_code rtems_io_register_name( |
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149 | char *device_name, |
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150 | rtems_device_major_number major, |
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151 | rtems_device_minor_number minor |
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152 | ); |
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153 | |
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154 | |
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155 | /* |
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156 | * rtems_io_lookup_name |
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157 | * |
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158 | * DESCRIPTION: |
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159 | * |
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160 | * Find what driver "owns" this name |
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161 | */ |
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162 | |
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163 | rtems_status_code rtems_io_lookup_name( |
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164 | const char *name, |
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165 | rtems_driver_name_t *device_info |
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166 | ); |
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167 | |
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168 | |
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169 | /* |
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170 | * rtems_io_initialize |
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171 | * |
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172 | * DESCRIPTION: |
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173 | * |
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174 | * This routine implements the rtems_io_initialize directive. It is invoked |
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175 | * to initialize a device driver or an individual device. |
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176 | */ |
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177 | |
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178 | rtems_status_code rtems_io_initialize( |
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179 | rtems_device_major_number major, |
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180 | rtems_device_minor_number minor, |
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181 | void *argument |
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182 | ); |
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183 | |
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184 | /* |
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185 | * rtems_io_open |
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186 | * |
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187 | * DESCRIPTION: |
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188 | * |
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189 | * This routine implements the rtems_io_open directive. It is invoked |
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190 | * to open a device. |
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191 | */ |
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192 | |
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193 | rtems_status_code rtems_io_open( |
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194 | rtems_device_major_number major, |
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195 | rtems_device_minor_number minor, |
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196 | void *argument |
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197 | ); |
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198 | |
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199 | /* |
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200 | * rtems_io_close |
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201 | * |
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202 | * DESCRIPTION: |
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203 | * |
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204 | * This routine implements the rtems_io_close directive. It is invoked |
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205 | * to close a device. |
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206 | */ |
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207 | |
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208 | rtems_status_code rtems_io_close( |
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209 | rtems_device_major_number major, |
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210 | rtems_device_minor_number minor, |
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211 | void *argument |
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212 | ); |
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213 | |
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214 | /* |
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215 | * rtems_io_read |
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216 | * |
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217 | * DESCRIPTION: |
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218 | * |
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219 | * This routine implements the rtems_io_read directive. It is invoked |
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220 | * to read from a device. |
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221 | */ |
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222 | |
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223 | rtems_status_code rtems_io_read( |
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224 | rtems_device_major_number major, |
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225 | rtems_device_minor_number minor, |
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226 | void *argument |
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227 | ); |
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228 | |
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229 | /* |
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230 | * rtems_io_write |
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231 | * |
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232 | * DESCRIPTION: |
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233 | * |
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234 | * This routine implements the rtems_io_write directive. It is invoked |
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235 | * to write to a device. |
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236 | */ |
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237 | |
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238 | rtems_status_code rtems_io_write( |
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239 | rtems_device_major_number major, |
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240 | rtems_device_minor_number minor, |
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241 | void *argument |
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242 | ); |
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243 | |
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244 | /* |
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245 | * rtems_io_control |
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246 | * |
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247 | * DESCRIPTION: |
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248 | * |
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249 | * This routine implements the rtems_io_control directive. It is invoked |
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250 | * to perform a device specific operation on a device. |
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251 | */ |
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252 | |
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253 | rtems_status_code rtems_io_control( |
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254 | rtems_device_major_number major, |
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255 | rtems_device_minor_number minor, |
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256 | void *argument |
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257 | ); |
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258 | |
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259 | /* |
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260 | * _IO_Initialize_all_drivers |
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261 | * |
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262 | * DESCRIPTION: |
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263 | * |
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264 | * This routine initializes all of the device drivers configured |
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265 | * in the Device Driver Address Table. |
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266 | */ |
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267 | |
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268 | void _IO_Initialize_all_drivers( void ); |
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269 | |
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270 | #ifdef __cplusplus |
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271 | } |
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272 | #endif |
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273 | |
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274 | #endif |
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275 | /* end of include file */ |
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