1 | /* dmx.c |
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2 | * |
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3 | * Milkymist DMX512 driver for RTEMS |
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4 | * |
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5 | * The license and distribution terms for this file may be |
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6 | * found in the file LICENSE in this distribution or at |
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7 | * http://www.rtems.com/license/LICENSE. |
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8 | * |
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9 | * $Id$ |
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10 | * |
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11 | * COPYRIGHT (c) 2010, 2011 Sebastien Bourdeauducq |
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12 | */ |
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13 | |
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14 | #define RTEMS_STATUS_CHECKS_USE_PRINTK |
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15 | |
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16 | #include <stdlib.h> |
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17 | #include <sys/types.h> |
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18 | #include <rtems.h> |
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19 | #include <rtems/status-checks.h> |
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20 | #include <bsp.h> |
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21 | #include <rtems/libio.h> |
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22 | #include "../include/system_conf.h" |
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23 | #include "milkymist_dmx.h" |
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24 | |
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25 | #define IN_DEVICE_NAME "/dev/dmx_in" |
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26 | #define OUT_DEVICE_NAME "/dev/dmx_out" |
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27 | |
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28 | rtems_device_driver dmx_initialize( |
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29 | rtems_device_major_number major, |
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30 | rtems_device_minor_number minor, |
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31 | void *arg |
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32 | ) |
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33 | { |
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34 | rtems_status_code sc; |
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35 | |
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36 | sc = rtems_io_register_name(IN_DEVICE_NAME, major, 0); |
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37 | RTEMS_CHECK_SC(sc, "create DMX input device"); |
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38 | |
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39 | sc = rtems_io_register_name(OUT_DEVICE_NAME, major, 1); |
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40 | RTEMS_CHECK_SC(sc, "create DMX output device"); |
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41 | |
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42 | return RTEMS_SUCCESSFUL; |
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43 | } |
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44 | |
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45 | rtems_device_driver dmx_read( |
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46 | rtems_device_major_number major, |
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47 | rtems_device_minor_number minor, |
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48 | void *arg |
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49 | ) |
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50 | { |
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51 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
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52 | int len; |
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53 | unsigned int i; |
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54 | unsigned char *values = (unsigned char *)rw_args->buffer; |
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55 | |
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56 | len = 512 - rw_args->offset; |
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57 | if (len < 0) { |
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58 | rw_args->bytes_moved = 0; |
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59 | return RTEMS_SUCCESSFUL; |
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60 | } |
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61 | if (len > rw_args->count) |
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62 | len = rw_args->count; |
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63 | |
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64 | if (minor == 0) { |
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65 | for (i=0;i<len;i++) |
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66 | values[i] = MM_READ(MM_DMX_RX((unsigned int)rw_args->offset+i)); |
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67 | } else { |
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68 | for (i=0;i<len;i++) |
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69 | values[i] = MM_READ(MM_DMX_TX((unsigned int)rw_args->offset+i)); |
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70 | } |
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71 | |
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72 | rw_args->bytes_moved = len; |
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73 | |
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74 | return RTEMS_SUCCESSFUL; |
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75 | } |
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76 | |
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77 | rtems_device_driver dmx_write( |
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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 | void *arg |
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81 | ) |
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82 | { |
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83 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
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84 | int len; |
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85 | unsigned int i; |
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86 | unsigned char *values = (unsigned char *)rw_args->buffer; |
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87 | |
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88 | if (minor == 0) { |
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89 | rw_args->bytes_moved = 0; |
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90 | return RTEMS_UNSATISFIED; |
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91 | } |
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92 | |
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93 | len = 512 - rw_args->offset; |
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94 | if (len < 0) { |
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95 | rw_args->bytes_moved = 0; |
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96 | return RTEMS_SUCCESSFUL; |
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97 | } |
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98 | if (len > rw_args->count) |
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99 | len = rw_args->count; |
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100 | |
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101 | for (i=0;i<len;i++) |
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102 | MM_WRITE(MM_DMX_TX((unsigned int)rw_args->offset+i), values[i]); |
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103 | |
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104 | rw_args->bytes_moved = len; |
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105 | |
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106 | return RTEMS_SUCCESSFUL; |
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107 | } |
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108 | |
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109 | rtems_device_driver dmx_control( |
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110 | rtems_device_major_number major, |
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111 | rtems_device_minor_number minor, |
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112 | void *arg |
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113 | ) |
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114 | { |
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115 | rtems_libio_ioctl_args_t *args = arg; |
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116 | |
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117 | switch (args->command) { |
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118 | case DMX_SET_THRU: |
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119 | args->ioctl_return = 0; |
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120 | MM_WRITE(MM_DMX_THRU, (unsigned int)args->buffer); |
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121 | return RTEMS_SUCCESSFUL; |
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122 | case DMX_GET_THRU: |
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123 | args->ioctl_return = 0; |
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124 | *((unsigned int *)args->buffer) = MM_READ(MM_DMX_THRU); |
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125 | return RTEMS_SUCCESSFUL; |
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126 | default: |
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127 | args->ioctl_return = -1; |
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128 | return RTEMS_UNSATISFIED; |
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129 | } |
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130 | } |
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