1 | /* |
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2 | * SPDX-License-Identifier: BSD-2-Clause |
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3 | * |
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4 | * Copyright (C) 2020 embedded brains GmbH. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * 1. Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * 2. Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * |
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15 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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16 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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19 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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20 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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21 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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22 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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23 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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24 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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25 | * POSSIBILITY OF SUCH DAMAGE. |
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26 | */ |
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27 | |
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28 | /* |
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29 | * The command implemented here has a similar interface like the one from Linux |
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30 | * i2c tools. Think of it as a heavily simplified version of them. Instead of |
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31 | * the bus number they expect a bus path. |
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32 | * |
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33 | * Additionally the i2cget has a continuous read mode that isn't available on |
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34 | * Linux but does something similar to i2cdump. |
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35 | */ |
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36 | |
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37 | #include <dev/i2c/i2c.h> |
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38 | #include <fcntl.h> |
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39 | #include <stdio.h> |
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40 | #include <stdlib.h> |
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41 | |
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42 | #include <rtems/shell.h> |
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43 | |
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44 | static const char rtems_i2cget_shell_usage [] = |
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45 | "i2cget <I2C_BUS> <CHIP-ADDRESS> <DATA-ADDRESS> [<NR-BYTES>]\n" |
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46 | "\tGet one or more bytes from an EEPROM like i2c device.\n" |
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47 | "\tNote that multiple bytes will be read in continuous mode.\n"; |
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48 | |
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49 | static int read_bytes( |
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50 | int fd, |
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51 | uint16_t i2c_address, |
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52 | uint8_t data_address, |
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53 | uint16_t nr_bytes |
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54 | ) |
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55 | { |
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56 | int rv; |
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57 | uint8_t value[nr_bytes]; |
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58 | i2c_msg msgs[] = {{ |
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59 | .addr = i2c_address, |
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60 | .flags = 0, |
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61 | .buf = &data_address, |
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62 | .len = 1, |
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63 | }, { |
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64 | .addr = i2c_address, |
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65 | .flags = I2C_M_RD, |
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66 | .buf = value, |
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67 | .len = nr_bytes, |
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68 | }}; |
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69 | struct i2c_rdwr_ioctl_data payload = { |
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70 | .msgs = msgs, |
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71 | .nmsgs = sizeof(msgs)/sizeof(msgs[0]), |
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72 | }; |
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73 | uint16_t i; |
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74 | |
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75 | rv = ioctl(fd, I2C_RDWR, &payload); |
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76 | if (rv < 0) { |
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77 | perror("ioctl failed"); |
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78 | } else { |
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79 | for (i = 0; i < nr_bytes; ++i) { |
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80 | printf("0x%02x ", value[i]); |
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81 | } |
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82 | printf("\n"); |
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83 | } |
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84 | |
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85 | return rv; |
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86 | } |
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87 | |
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88 | static int rtems_i2cget_shell_main(int argc, char *argv[]) |
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89 | { |
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90 | int fd; |
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91 | int rv; |
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92 | const char *bus; |
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93 | uint16_t chip_address; |
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94 | uint8_t data_address; |
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95 | uint16_t nr_bytes; |
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96 | |
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97 | if (argc < 4 || argc > 5) { |
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98 | printf(rtems_i2cget_shell_usage); |
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99 | return 1; |
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100 | } |
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101 | |
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102 | errno = 0; |
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103 | chip_address = (uint16_t) strtoul(argv[2], NULL, 0); |
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104 | if (errno != 0) { |
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105 | perror("Couldn't read chip address"); |
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106 | return 1; |
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107 | } |
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108 | |
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109 | errno = 0; |
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110 | data_address = (uint8_t) strtoul(argv[3], NULL, 0); |
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111 | if (errno != 0) { |
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112 | perror("Couldn't read data address"); |
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113 | return 1; |
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114 | } |
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115 | |
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116 | nr_bytes = 1; |
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117 | if (argc == 5) { |
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118 | errno = 0; |
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119 | nr_bytes = (uint16_t) strtoul(argv[4], NULL, 0); |
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120 | if (errno != 0) { |
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121 | perror("Couldn't read number of bytes"); |
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122 | return 1; |
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123 | } |
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124 | } |
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125 | |
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126 | bus = argv[1]; |
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127 | fd = open(bus, O_RDWR); |
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128 | if (fd < 0) { |
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129 | perror("Couldn't open bus"); |
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130 | return 1; |
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131 | } |
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132 | |
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133 | rv = read_bytes(fd, chip_address, data_address, nr_bytes); |
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134 | |
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135 | close(fd); |
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136 | |
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137 | return rv; |
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138 | } |
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139 | |
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140 | rtems_shell_cmd_t rtems_shell_I2CGET_Command = { |
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141 | .name = "i2cget", |
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142 | .usage = rtems_i2cget_shell_usage, |
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143 | .topic = "misc", |
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144 | .command = rtems_i2cget_shell_main, |
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145 | }; |
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