1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Classic Input/Output Manager API |
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5 | * |
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6 | * This file emulates the old Classic RTEMS IO manager directives |
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7 | * which register and lookup names using the in-memory filesystem. |
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8 | */ |
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9 | |
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10 | /* |
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11 | * COPYRIGHT (c) 1989-2008. |
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12 | * On-Line Applications Research Corporation (OAR). |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.com/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #ifndef _RTEMS_IO_H |
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20 | #define _RTEMS_IO_H |
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21 | |
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22 | #ifndef SAPI_IO_EXTERN |
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23 | #define SAPI_IO_EXTERN extern |
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24 | #endif |
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25 | |
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26 | #include <rtems/rtems/status.h> |
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27 | |
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28 | #ifdef __cplusplus |
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29 | extern "C" { |
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30 | #endif |
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31 | |
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32 | /** |
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33 | * @defgroup ClassicIO Input/Output |
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34 | * |
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35 | * @ingroup ClassicRTEMS |
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36 | * |
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37 | * @{ |
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38 | */ |
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39 | |
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40 | typedef uint32_t rtems_device_major_number; |
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41 | |
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42 | typedef uint32_t rtems_device_minor_number; |
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43 | |
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44 | typedef rtems_status_code rtems_device_driver; |
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45 | |
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46 | typedef rtems_device_driver (*rtems_device_driver_entry)( |
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47 | rtems_device_major_number, |
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48 | rtems_device_minor_number, |
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49 | void * |
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50 | ); |
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51 | |
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52 | typedef struct { |
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53 | rtems_device_driver_entry initialization_entry; |
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54 | rtems_device_driver_entry open_entry; |
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55 | rtems_device_driver_entry close_entry; |
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56 | rtems_device_driver_entry read_entry; |
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57 | rtems_device_driver_entry write_entry; |
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58 | rtems_device_driver_entry control_entry; |
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59 | } rtems_driver_address_table; |
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60 | |
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61 | /** |
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62 | * @name Device Driver Maintainance |
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63 | * |
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64 | * @{ |
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65 | */ |
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66 | |
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67 | /** |
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68 | * @brief Returns @c RTEMS_IO_ERROR. |
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69 | * |
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70 | * @retval RTEMS_IO_ERROR Only this one. |
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71 | */ |
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72 | rtems_status_code rtems_io_driver_io_error( |
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73 | rtems_device_major_number major, |
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74 | rtems_device_minor_number minor, |
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75 | void *arg |
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76 | ); |
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77 | |
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78 | /** |
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79 | * @brief Registers and initializes the device with the device driver table |
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80 | * @a driver_table and major number @a major. |
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81 | * |
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82 | * If the major number equals zero a major number will be obtained. The major |
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83 | * number of the registered driver will be returned in @a registered_major. |
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84 | * |
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85 | * After a successful registration rtems_io_initialize() will be called to |
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86 | * initialize the device. |
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87 | * |
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88 | * @retval RTEMS_SUCCESSFUL Device successfully registered and initialized. |
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89 | * @retval RTEMS_INVALID_ADDRESS Pointer to driver table or to registered |
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90 | * major number are invalid. Device driver table is empty. |
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91 | * @retval RTEMS_INVALID_NUMBER Invalid major number. |
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92 | * @retval RTEMS_TOO_MANY No major number available. |
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93 | * @retval RTEMS_RESOURCE_IN_USE Major number in use. |
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94 | * @retval RTEMS_CALLED_FROM_ISR Called from interrupt context. |
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95 | * @retval * Status code depends on rtems_io_initialize(). |
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96 | */ |
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97 | rtems_status_code rtems_io_register_driver( |
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98 | rtems_device_major_number major, |
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99 | const rtems_driver_address_table *driver_table, |
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100 | rtems_device_major_number *registered_major |
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101 | ); |
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102 | |
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103 | /** |
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104 | * @brief Unregister a Driver from the Device Driver Table. |
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105 | * |
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106 | * @param[in] major is the device major number. |
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107 | * |
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108 | * @retval RTEMS_SUCCESSFUL Device driver successfully unregistered. |
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109 | * @retval RTEMS_UNSATISFIED Invalid major number. |
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110 | * @retval RTEMS_CALLED_FROM_ISR Called from interrupt context. |
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111 | */ |
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112 | rtems_status_code rtems_io_unregister_driver( |
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113 | rtems_device_major_number major |
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114 | ); |
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115 | |
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116 | /** |
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117 | * @brief Registers the name @a device_name in the file system for the device |
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118 | * with number tuple @a major and @a minor. |
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119 | * |
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120 | * This assumes that all registered devices are character devices. |
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121 | * |
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122 | * @retval RTEMS_SUCCESSFUL Name successfully registered. |
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123 | * @retval RTEMS_TOO_MANY Name already in use or other errors. |
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124 | */ |
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125 | rtems_status_code rtems_io_register_name( |
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126 | const char *device_name, |
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127 | rtems_device_major_number major, |
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128 | rtems_device_minor_number minor |
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129 | ); |
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130 | |
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131 | /** @} */ |
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132 | |
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133 | /** |
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134 | * @brief IO Driver Initialization |
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135 | * |
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136 | * This routine is the initialization directive of the IO manager. |
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137 | * |
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138 | * @param[in] major is the device drive number |
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139 | * @param[in] minor is the device number |
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140 | * @param[in] argument is the pointer to the argument(s) |
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141 | * |
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142 | * @return status code |
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143 | */ |
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144 | rtems_status_code rtems_io_initialize( |
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145 | rtems_device_major_number major, |
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146 | rtems_device_minor_number minor, |
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147 | void *argument |
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148 | ); |
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149 | |
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150 | /** |
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151 | * @brief Opening for The IO Manager |
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152 | * |
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153 | * Opens a device driver with the number @a major. |
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154 | * |
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155 | * @param[in] major is the device driver number. |
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156 | * @param[in] minor is the device number. |
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157 | * @param[in] argument is the pointer to the argument(s). |
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158 | * |
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159 | * @return Status code. |
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160 | */ |
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161 | rtems_status_code rtems_io_open( |
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162 | rtems_device_major_number major, |
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163 | rtems_device_minor_number minor, |
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164 | void *argument |
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165 | ); |
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166 | |
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167 | /** |
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168 | * @brief Closing for The IO Manager |
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169 | * |
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170 | * This routine is the close directive of the IO manager. |
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171 | * |
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172 | * @param[in] major is the device driver number. |
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173 | * @param[in] minor is the device number. |
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174 | * @param[in] argument is the pointer to the argument(s). |
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175 | * |
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176 | * @return Status code. |
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177 | */ |
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178 | rtems_status_code rtems_io_close( |
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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 | * @brief Reading for The IO Manager |
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186 | * |
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187 | * This routine is the read directive of the IO manager. |
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188 | * |
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189 | * @param[in] major is the device driver number. |
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190 | * @param[in] minor is the device number. |
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191 | * @param[in] argument is the pointer to the argument(s). |
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192 | * |
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193 | * @return Status code. |
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194 | */ |
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195 | rtems_status_code rtems_io_read( |
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196 | rtems_device_major_number major, |
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197 | rtems_device_minor_number minor, |
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198 | void *argument |
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199 | ); |
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200 | |
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201 | /** |
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202 | * @brief Writing for The IO Manager |
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203 | * |
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204 | * This routine is the write directive of the IO manager. |
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205 | * |
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206 | * @param[in] major is the device driver number. |
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207 | * @param[in] minor is the device number. |
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208 | * @param[in] argument is the pointer to the argument(s). |
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209 | * |
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210 | * @return Status code. |
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211 | */ |
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212 | rtems_status_code rtems_io_write( |
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213 | rtems_device_major_number major, |
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214 | rtems_device_minor_number minor, |
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215 | void *argument |
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216 | ); |
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217 | |
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218 | /** |
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219 | * @brief Control for The IO Manager |
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220 | * |
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221 | * This routine is the control directive of the IO manager. |
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222 | * |
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223 | * @param[in] major is the device driver number. |
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224 | * @param[in] minor is the device number. |
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225 | * @param[in] argument is the pointer to the argument(s). |
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226 | * |
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227 | * @return Status code. |
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228 | */ |
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229 | rtems_status_code rtems_io_control( |
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230 | rtems_device_major_number major, |
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231 | rtems_device_minor_number minor, |
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232 | void *argument |
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233 | ); |
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234 | |
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235 | /** @} */ |
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236 | |
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237 | /** @} */ |
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238 | |
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239 | typedef struct { |
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240 | const char *device_name; |
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241 | size_t device_name_length; |
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242 | rtems_device_major_number major; |
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243 | rtems_device_minor_number minor; |
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244 | } rtems_driver_name_t; |
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245 | |
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246 | /** |
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247 | * @deprecated Use stat() instead. |
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248 | */ |
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249 | rtems_status_code rtems_io_lookup_name( |
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250 | const char *name, |
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251 | rtems_driver_name_t *device_info |
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252 | ) RTEMS_COMPILER_DEPRECATED_ATTRIBUTE; |
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253 | |
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254 | SAPI_IO_EXTERN uint32_t _IO_Number_of_drivers; |
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255 | |
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256 | SAPI_IO_EXTERN rtems_driver_address_table *_IO_Driver_address_table; |
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257 | |
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258 | /** |
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259 | * @brief Initialization of Device Drivers |
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260 | * |
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261 | * @note The IO manager has been extended to support runtime driver |
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262 | * registration. The driver table is now allocated in the |
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263 | * workspace. |
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264 | */ |
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265 | void _IO_Manager_initialization( void ); |
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266 | |
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267 | /** |
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268 | * @brief Initialization of All Device Drivers |
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269 | * |
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270 | * Initializes all device drivers. |
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271 | */ |
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272 | void _IO_Initialize_all_drivers( void ); |
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273 | |
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274 | #ifdef __cplusplus |
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275 | } |
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276 | #endif |
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277 | |
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278 | #endif |
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279 | /* end of include file */ |
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