1 | /** |
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2 | * @file rtems/termiostypes.h |
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3 | * |
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4 | * RTEMS termios device support internal data structures |
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5 | */ |
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6 | |
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7 | /* |
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8 | * COPYRIGHT (c) 1989-2011. |
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9 | * On-Line Applications Research Corporation (OAR). |
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10 | * |
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11 | * The license and distribution terms for this file may be |
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12 | * found in the file LICENSE in this distribution or at |
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13 | * http://www.rtems.org/license/LICENSE. |
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14 | */ |
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15 | |
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16 | #ifndef __TERMIOSTYPES_H |
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17 | #define __TERMIOSTYPES_H |
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18 | |
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19 | #include <rtems.h> |
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20 | #include <rtems/libio.h> |
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21 | #include <rtems/assoc.h> |
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22 | #include <rtems/chain.h> |
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23 | #include <sys/ioccom.h> |
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24 | #include <stdint.h> |
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25 | #include <termios.h> |
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26 | |
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27 | #ifdef __cplusplus |
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28 | extern "C" { |
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29 | #endif |
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30 | |
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31 | /** |
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32 | * @defgroup TermiostypesSupport RTEMS Termios Device Support |
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33 | * |
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34 | * @ingroup libcsupport |
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35 | * |
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36 | * @brief RTEMS Termios Device Support Internal Data Structures |
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37 | */ |
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38 | |
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39 | /* |
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40 | * Wakeup callback data structure |
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41 | */ |
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42 | struct ttywakeup { |
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43 | void (*sw_pfn)(struct termios *tty, void *arg); |
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44 | void *sw_arg; |
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45 | }; |
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46 | |
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47 | /* |
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48 | * Variables associated with the character buffer |
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49 | */ |
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50 | struct rtems_termios_rawbuf { |
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51 | char *theBuf; |
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52 | volatile unsigned int Head; |
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53 | volatile unsigned int Tail; |
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54 | volatile unsigned int Size; |
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55 | rtems_id Semaphore; |
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56 | }; |
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57 | |
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58 | typedef enum { |
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59 | TERMIOS_POLLED, |
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60 | TERMIOS_IRQ_DRIVEN, |
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61 | TERMIOS_TASK_DRIVEN, |
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62 | TERMIOS_IRQ_SERVER_DRIVEN |
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63 | } rtems_termios_device_mode; |
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64 | |
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65 | struct rtems_termios_tty; |
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66 | |
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67 | /** |
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68 | * @brief Termios device context. |
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69 | * |
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70 | * @see RTEMS_TERMIOS_DEVICE_CONTEXT_INITIALIZER(), |
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71 | * rtems_termios_device_context_initialize() and |
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72 | * rtems_termios_device_install(). |
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73 | */ |
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74 | typedef struct rtems_termios_device_context { |
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75 | union { |
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76 | /* Used for TERMIOS_POLLED and TERMIOS_IRQ_DRIVEN */ |
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77 | rtems_interrupt_lock interrupt; |
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78 | |
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79 | /* Used for TERMIOS_IRQ_SERVER_DRIVEN or TERMIOS_TASK_DRIVEN */ |
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80 | rtems_id mutex; |
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81 | } lock; |
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82 | |
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83 | void ( *lock_acquire )( |
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84 | struct rtems_termios_device_context *, |
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85 | rtems_interrupt_lock_context * |
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86 | ); |
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87 | |
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88 | void ( *lock_release )( |
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89 | struct rtems_termios_device_context *, |
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90 | rtems_interrupt_lock_context * |
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91 | ); |
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92 | } rtems_termios_device_context; |
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93 | |
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94 | void rtems_termios_device_lock_acquire_default( |
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95 | rtems_termios_device_context *ctx, |
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96 | rtems_interrupt_lock_context *lock_context |
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97 | ); |
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98 | |
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99 | void rtems_termios_device_lock_release_default( |
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100 | rtems_termios_device_context *ctx, |
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101 | rtems_interrupt_lock_context *lock_context |
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102 | ); |
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103 | |
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104 | /** |
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105 | * @brief Initializes a device context. |
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106 | * |
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107 | * @param[in] context The Termios device context. |
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108 | * @param[in] name The name for the interrupt lock. This name must be a |
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109 | * string persistent throughout the life time of this lock. The name is only |
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110 | * used if profiling is enabled. |
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111 | */ |
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112 | RTEMS_INLINE_ROUTINE void rtems_termios_device_context_initialize( |
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113 | rtems_termios_device_context *context, |
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114 | const char *name |
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115 | ) |
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116 | { |
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117 | rtems_interrupt_lock_initialize( &context->lock.interrupt, name ); |
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118 | context->lock_acquire = rtems_termios_device_lock_acquire_default; |
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119 | context->lock_release = rtems_termios_device_lock_release_default; |
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120 | } |
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121 | |
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122 | /** |
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123 | * @brief Initializer for static initialization of Termios device contexts. |
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124 | * |
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125 | * @param name The name for the interrupt lock. It must be a string. The name |
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126 | * is only used if profiling is enabled. |
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127 | */ |
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128 | #define RTEMS_TERMIOS_DEVICE_CONTEXT_INITIALIZER( name ) \ |
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129 | { \ |
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130 | { RTEMS_INTERRUPT_LOCK_INITIALIZER( name ) }, \ |
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131 | rtems_termios_device_lock_acquire_default, \ |
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132 | rtems_termios_device_lock_release_default \ |
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133 | } |
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134 | |
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135 | /** |
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136 | * @brief Termios device handler. |
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137 | * |
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138 | * @see rtems_termios_device_install(). |
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139 | */ |
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140 | typedef struct { |
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141 | /** |
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142 | * @brief First open of this device. |
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143 | * |
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144 | * @param[in] tty The Termios control. This parameter may be passed to |
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145 | * interrupt service routines since it must be provided for the |
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146 | * rtems_termios_enqueue_raw_characters() and |
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147 | * rtems_termios_dequeue_characters() functions. |
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148 | * @param[in] context The Termios device context. |
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149 | * @param[in] term The current Termios attributes. |
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150 | * @param[in] args The open/close arguments. This is parameter provided to |
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151 | * support legacy drivers. It must not be used by new drivers. |
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152 | * |
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153 | * @retval true Successful operation. |
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154 | * @retval false Cannot open device. |
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155 | * |
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156 | * @see rtems_termios_get_device_context() and rtems_termios_set_best_baud(). |
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157 | */ |
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158 | bool (*first_open)( |
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159 | struct rtems_termios_tty *tty, |
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160 | rtems_termios_device_context *context, |
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161 | struct termios *term, |
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162 | rtems_libio_open_close_args_t *args |
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163 | ); |
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164 | |
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165 | /** |
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166 | * @brief Last close of this device. |
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167 | * |
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168 | * @param[in] tty The Termios control. |
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169 | * @param[in] context The Termios device context. |
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170 | * @param[in] args The open/close arguments. This is parameter provided to |
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171 | * support legacy drivers. It must not be used by new drivers. |
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172 | */ |
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173 | void (*last_close)( |
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174 | struct rtems_termios_tty *tty, |
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175 | rtems_termios_device_context *context, |
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176 | rtems_libio_open_close_args_t *args |
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177 | ); |
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178 | |
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179 | /** |
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180 | * @brief Polled read. |
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181 | * |
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182 | * In case mode is TERMIOS_IRQ_DRIVEN, TERMIOS_IRQ_SERVER_DRIVEN or |
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183 | * TERMIOS_TASK_DRIVEN, then data is received via |
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184 | * rtems_termios_enqueue_raw_characters(). |
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185 | * |
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186 | * @param[in] context The Termios device context. |
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187 | * |
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188 | * @retval char The received data encoded as unsigned char. |
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189 | * @retval -1 No data currently available. |
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190 | */ |
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191 | int (*poll_read)(rtems_termios_device_context *context); |
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192 | |
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193 | /** |
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194 | * @brief Polled write in case mode is TERMIOS_POLLED or write support |
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195 | * otherwise. |
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196 | * |
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197 | * @param[in] context The Termios device context. |
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198 | * @param[in] buf The output buffer. |
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199 | * @param[in] len The output buffer length in characters. |
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200 | */ |
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201 | void (*write)( |
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202 | rtems_termios_device_context *context, |
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203 | const char *buf, |
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204 | size_t len |
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205 | ); |
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206 | |
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207 | /** |
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208 | * @brief Set attributes after a Termios settings change. |
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209 | * |
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210 | * @param[in] context The Termios device context. |
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211 | * @param[in] term The new Termios attributes. |
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212 | * |
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213 | * @retval true Successful operation. |
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214 | * @retval false Invalid attributes. |
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215 | */ |
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216 | bool (*set_attributes)( |
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217 | rtems_termios_device_context *context, |
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218 | const struct termios *term |
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219 | ); |
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220 | |
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221 | /** |
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222 | * @brief IO control handler. |
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223 | * |
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224 | * Invoked in case the Termios layer cannot deal with the IO request. |
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225 | * |
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226 | * @param[in] context The Termios device context. |
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227 | * @param[in] request The IO control request. |
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228 | * @param[in] buffer The IO control buffer. |
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229 | */ |
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230 | int (*ioctl)( |
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231 | rtems_termios_device_context *context, |
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232 | ioctl_command_t request, |
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233 | void *buffer |
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234 | ); |
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235 | |
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236 | /** |
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237 | * @brief Termios device mode. |
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238 | */ |
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239 | rtems_termios_device_mode mode; |
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240 | } rtems_termios_device_handler; |
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241 | |
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242 | /** |
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243 | * @brief Termios device flow control handler. |
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244 | * |
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245 | * @see rtems_termios_device_install(). |
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246 | */ |
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247 | typedef struct { |
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248 | /** |
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249 | * @brief Indicate to stop remote transmitter. |
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250 | * |
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251 | * @param[in] context The Termios device context. |
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252 | */ |
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253 | void (*stop_remote_tx)(rtems_termios_device_context *context); |
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254 | |
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255 | /** |
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256 | * @brief Indicate to start remote transmitter. |
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257 | * |
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258 | * @param[in] context The Termios device context. |
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259 | */ |
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260 | void (*start_remote_tx)(rtems_termios_device_context *context); |
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261 | } rtems_termios_device_flow; |
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262 | |
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263 | /** |
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264 | * @brief Termios device node for installed devices. |
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265 | * |
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266 | * @see rtems_termios_device_install(). |
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267 | */ |
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268 | typedef struct rtems_termios_device_node { |
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269 | rtems_chain_node node; |
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270 | rtems_device_major_number major; |
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271 | rtems_device_minor_number minor; |
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272 | const rtems_termios_device_handler *handler; |
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273 | const rtems_termios_device_flow *flow; |
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274 | rtems_termios_device_context *context; |
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275 | struct rtems_termios_tty *tty; |
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276 | } rtems_termios_device_node; |
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277 | |
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278 | /* |
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279 | * Variables associated with each termios instance. |
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280 | * One structure for each hardware I/O device. |
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281 | */ |
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282 | typedef struct rtems_termios_tty { |
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283 | /* |
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284 | * Linked-list of active TERMIOS devices |
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285 | */ |
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286 | struct rtems_termios_tty *forw; |
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287 | struct rtems_termios_tty *back; |
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288 | |
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289 | /* |
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290 | * How many times has this device been opened |
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291 | */ |
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292 | int refcount; |
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293 | |
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294 | /* |
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295 | * This device |
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296 | */ |
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297 | rtems_device_major_number major; |
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298 | rtems_device_minor_number minor; |
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299 | |
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300 | /* |
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301 | * Mutual-exclusion semaphores |
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302 | */ |
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303 | rtems_id isem; |
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304 | rtems_id osem; |
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305 | |
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306 | /* |
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307 | * The canonical (cooked) character buffer |
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308 | */ |
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309 | char *cbuf; |
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310 | int ccount; |
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311 | int cindex; |
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312 | |
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313 | /* |
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314 | * Keep track of cursor (printhead) position |
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315 | */ |
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316 | int column; |
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317 | int read_start_column; |
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318 | |
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319 | /* |
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320 | * The ioctl settings |
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321 | */ |
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322 | struct termios termios; |
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323 | rtems_interval vtimeTicks; |
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324 | |
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325 | /* |
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326 | * Raw input character buffer |
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327 | */ |
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328 | struct rtems_termios_rawbuf rawInBuf; |
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329 | uint32_t rawInBufSemaphoreOptions; |
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330 | rtems_interval rawInBufSemaphoreTimeout; |
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331 | rtems_interval rawInBufSemaphoreFirstTimeout; |
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332 | unsigned int rawInBufDropped; /* Statistics */ |
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333 | |
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334 | /* |
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335 | * Raw output character buffer |
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336 | */ |
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337 | struct rtems_termios_rawbuf rawOutBuf; |
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338 | int t_dqlen; /* count of characters dequeued from device */ |
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339 | enum {rob_idle, rob_busy, rob_wait } rawOutBufState; |
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340 | |
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341 | /* |
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342 | * Callbacks to device-specific routines |
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343 | */ |
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344 | rtems_termios_callbacks device; |
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345 | |
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346 | /** |
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347 | * @brief Context for legacy devices using the callbacks. |
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348 | */ |
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349 | rtems_termios_device_context legacy_device_context; |
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350 | |
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351 | /** |
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352 | * @brief The device handler. |
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353 | */ |
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354 | rtems_termios_device_handler handler; |
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355 | |
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356 | /** |
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357 | * @brief The device flow control handler. |
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358 | */ |
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359 | rtems_termios_device_flow flow; |
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360 | |
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361 | volatile unsigned int flow_ctrl; |
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362 | unsigned int lowwater,highwater; |
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363 | |
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364 | /* |
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365 | * I/O task IDs (for task-driven drivers) |
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366 | */ |
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367 | rtems_id rxTaskId; |
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368 | rtems_id txTaskId; |
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369 | |
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370 | /* |
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371 | * line discipline related stuff |
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372 | */ |
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373 | int t_line; /* id of line discipline */ |
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374 | void *t_sc; /* hook for discipline-specific data structure */ |
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375 | |
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376 | /* |
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377 | * Wakeup callback variables |
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378 | */ |
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379 | struct ttywakeup tty_snd; |
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380 | struct ttywakeup tty_rcv; |
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381 | bool tty_rcvwakeup; |
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382 | |
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383 | /** |
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384 | * @brief Corresponding device node. |
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385 | */ |
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386 | rtems_termios_device_node *device_node; |
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387 | |
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388 | /** |
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389 | * @brief Context for device driver. |
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390 | */ |
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391 | rtems_termios_device_context *device_context; |
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392 | } rtems_termios_tty; |
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393 | |
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394 | /** |
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395 | * @brief Installs a Termios device. |
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396 | * |
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397 | * The installed Termios device may be removed via unlink(). |
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398 | * |
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399 | * @param[in] device_file The device file path. |
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400 | * @param[in] handler The device handler. It must be persistent throughout the |
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401 | * installed time of the device. |
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402 | * @param[in] flow The device flow control handler. The device flow control |
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403 | * handler are optional and may be @c NULL. If present must be persistent |
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404 | * throughout the installed time of the device. |
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405 | * @param[in] context The device context. It must be persistent throughout the |
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406 | * installed time of the device. |
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407 | * |
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408 | * @retval RTEMS_SUCCESSFUL Successful operation. |
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409 | * @retval RTEMS_NO_MEMORY Not enough memory to create a device node. |
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410 | * @retval RTEMS_UNSATISFIED Creation of the device file failed. |
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411 | * @retval RTEMS_INCORRECT_STATE Termios is not initialized. |
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412 | * |
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413 | * @see rtems_termios_get_device_context(). |
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414 | */ |
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415 | rtems_status_code rtems_termios_device_install( |
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416 | const char *device_file, |
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417 | const rtems_termios_device_handler *handler, |
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418 | const rtems_termios_device_flow *flow, |
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419 | rtems_termios_device_context *context |
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420 | ); |
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421 | |
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422 | /** |
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423 | * @brief Returns the device context of an installed Termios device. |
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424 | * |
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425 | * @param[in] tty The Termios control. |
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426 | */ |
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427 | RTEMS_INLINE_ROUTINE void *rtems_termios_get_device_context( |
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428 | const rtems_termios_tty *tty |
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429 | ) |
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430 | { |
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431 | return tty->device_context; |
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432 | } |
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433 | |
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434 | /** |
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435 | * @brief Acquires the device lock. |
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436 | * |
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437 | * @param[in] context The device context. |
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438 | * @param[in] lock_context The local interrupt lock context for an acquire and |
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439 | * release pair. |
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440 | */ |
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441 | RTEMS_INLINE_ROUTINE void rtems_termios_device_lock_acquire( |
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442 | rtems_termios_device_context *context, |
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443 | rtems_interrupt_lock_context *lock_context |
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444 | ) |
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445 | { |
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446 | ( *context->lock_acquire )( context, lock_context ); |
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447 | } |
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448 | |
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449 | /** |
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450 | * @brief Releases the device lock. |
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451 | * |
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452 | * @param[in] context The device context. |
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453 | * @param[in] lock_context The local interrupt lock context for an acquire and |
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454 | * release pair. |
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455 | */ |
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456 | RTEMS_INLINE_ROUTINE void rtems_termios_device_lock_release( |
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457 | rtems_termios_device_context *context, |
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458 | rtems_interrupt_lock_context *lock_context |
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459 | ) |
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460 | { |
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461 | ( *context->lock_release )( context, lock_context ); |
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462 | } |
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463 | |
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464 | /** |
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465 | * @brief Sets the best baud value in the Termios control. |
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466 | * |
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467 | * The valid Termios baud values are between 0 and 460800. The Termios baud |
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468 | * value is chosen which minimizes the difference to the value specified. |
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469 | * |
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470 | * @param[in] term The Termios attributes. |
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471 | * @param[in] baud The current baud setting of the device. |
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472 | */ |
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473 | void rtems_termios_set_best_baud( |
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474 | struct termios *term, |
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475 | uint32_t baud |
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476 | ); |
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477 | |
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478 | struct rtems_termios_linesw { |
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479 | int (*l_open) (struct rtems_termios_tty *tp); |
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480 | int (*l_close)(struct rtems_termios_tty *tp); |
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481 | int (*l_read )(struct rtems_termios_tty *tp,rtems_libio_rw_args_t *args); |
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482 | int (*l_write)(struct rtems_termios_tty *tp,rtems_libio_rw_args_t *args); |
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483 | int (*l_rint )(int c,struct rtems_termios_tty *tp); |
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484 | int (*l_start)(struct rtems_termios_tty *tp); |
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485 | int (*l_ioctl)(struct rtems_termios_tty *tp,rtems_libio_ioctl_args_t *args); |
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486 | int (*l_modem)(struct rtems_termios_tty *tp,int flags); |
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487 | }; |
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488 | |
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489 | /* |
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490 | * FIXME: this should move to termios.h! |
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491 | */ |
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492 | void rtems_termios_rxirq_occured(struct rtems_termios_tty *tty); |
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493 | |
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494 | /* |
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495 | * FIXME: this should move to termios.h! |
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496 | * put a string to output ring buffer |
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497 | */ |
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498 | void rtems_termios_puts ( |
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499 | const void *buf, |
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500 | size_t len, |
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501 | struct rtems_termios_tty *tty |
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502 | ); |
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503 | |
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504 | /* |
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505 | * global hooks for line disciplines |
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506 | */ |
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507 | extern struct rtems_termios_linesw rtems_termios_linesw[]; |
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508 | extern int rtems_termios_nlinesw; |
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509 | |
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510 | #define TTYDISC 0 /* termios tty line discipline */ |
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511 | #define TABLDISC 3 /* tablet discipline */ |
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512 | #define SLIPDISC 4 /* serial IP discipline */ |
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513 | #define PPPDISC 5 /* PPP discipline */ |
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514 | #define MAXLDISC 8 |
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515 | |
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516 | /* baudrate xxx integer type */ |
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517 | typedef uint32_t rtems_termios_baud_t; |
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518 | |
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519 | /** |
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520 | * @brief RTEMS Termios Baud Table |
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521 | */ |
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522 | extern const rtems_assoc_t rtems_termios_baud_table []; |
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523 | |
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524 | /** |
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525 | * @brief Converts the Integral Baud value @a baud to the Termios Control Flag |
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526 | * Representation |
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527 | * |
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528 | * @retval B0 Invalid baud value or a baud value of 0. |
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529 | * @retval other Baud constant according to @a baud. |
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530 | */ |
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531 | speed_t rtems_termios_number_to_baud(rtems_termios_baud_t baud); |
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532 | |
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533 | /** |
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534 | * @brief Converts the baud flags to an integral baud value. |
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535 | * |
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536 | * @retval 0 Invalid baud value or a baud value of @c B0. |
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537 | * @retval other Integral baud value. |
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538 | */ |
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539 | rtems_termios_baud_t rtems_termios_baud_to_number(speed_t baud); |
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540 | |
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541 | /** |
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542 | * @brief Convert Bxxx Constant to Index |
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543 | */ |
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544 | int rtems_termios_baud_to_index(rtems_termios_baud_t termios_baud); |
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545 | |
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546 | /** |
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547 | * @brief Sets the initial @a baud in the Termios context @a tty. |
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548 | * |
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549 | * @retval 0 Successful operation. |
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550 | * @retval -1 Invalid baud value. |
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551 | */ |
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552 | int rtems_termios_set_initial_baud( |
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553 | struct rtems_termios_tty *tty, |
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554 | rtems_termios_baud_t baud |
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555 | ); |
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556 | |
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557 | /** |
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558 | * @brief Termios kqueue() filter filesystem node handler |
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559 | * |
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560 | * Real implementation is provided by libbsd. |
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561 | */ |
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562 | int rtems_termios_kqfilter( |
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563 | rtems_libio_t *iop, |
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564 | struct knote *kn |
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565 | ); |
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566 | |
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567 | /** |
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568 | * @brief Termios poll() filesystem node handler. |
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569 | * |
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570 | * Real implementation is provided by libbsd. |
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571 | */ |
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572 | int rtems_termios_poll( |
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573 | rtems_libio_t *iop, |
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574 | int events |
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575 | ); |
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576 | |
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577 | #define RTEMS_IO_SNDWAKEUP _IOW('t', 11, struct ttywakeup ) /* send tty wakeup */ |
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578 | #define RTEMS_IO_RCVWAKEUP _IOW('t', 12, struct ttywakeup ) /* recv tty wakeup */ |
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579 | |
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580 | #define OLCUC 0x00000100 /* map lower case to upper case on output */ |
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581 | #define IUCLC 0x00004000 /* map upper case to lower case on input */ |
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582 | |
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583 | #define RTEMS_TERMIOS_NUMBER_BAUD_RATES 25 |
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584 | |
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585 | #ifdef __cplusplus |
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586 | } |
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587 | #endif |
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588 | |
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589 | #endif /* TERMIOSTYPES_H */ |
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