1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Temperature Sensor LM75A Driver Implementation |
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5 | * |
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6 | * @ingroup I2CSensorLM75A |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2017 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Dornierstr. 4 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * The license and distribution terms for this file may be |
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19 | * found in the file LICENSE in this distribution or at |
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20 | * http://www.rtems.org/license/LICENSE. |
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21 | */ |
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22 | |
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23 | #if HAVE_CONFIG_H |
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24 | #include "config.h" |
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25 | #endif |
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26 | |
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27 | #include <dev/i2c/sensor-lm75a.h> |
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28 | |
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29 | typedef enum { |
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30 | SENSOR_LM75A_PTR_TEMP, |
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31 | SENSOR_LM75A_PTR_CONF, |
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32 | SENSOR_LM75A_PTR_THYST, |
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33 | SENSOR_LM75A_PTR_TOS |
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34 | } sensor_lm75a_ptr; |
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35 | |
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36 | static int sensor_lm75a_get_reg_8( |
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37 | i2c_dev *dev, |
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38 | sensor_lm75a_ptr ptr, |
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39 | uint8_t *val |
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40 | ) |
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41 | { |
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42 | uint8_t out[1] = { ptr }; |
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43 | uint8_t in[sizeof(*val)]; |
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44 | i2c_msg msgs[2] = { |
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45 | { |
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46 | .addr = dev->address, |
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47 | .flags = 0, |
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48 | .len = (uint16_t) sizeof(out), |
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49 | .buf = &out[0] |
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50 | }, { |
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51 | .addr = dev->address, |
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52 | .flags = I2C_M_RD, |
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53 | .len = (uint16_t) sizeof(in), |
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54 | .buf = &in[0] |
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55 | } |
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56 | }; |
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57 | int err; |
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58 | |
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59 | err = i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs)); |
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60 | *val = in[0]; |
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61 | |
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62 | return err; |
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63 | } |
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64 | |
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65 | static int sensor_lm75a_set_reg_8( |
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66 | i2c_dev *dev, |
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67 | sensor_lm75a_ptr ptr, |
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68 | uint8_t val |
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69 | ) |
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70 | { |
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71 | uint8_t out[2] = { ptr, val }; |
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72 | i2c_msg msgs[1] = { |
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73 | { |
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74 | .addr = dev->address, |
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75 | .flags = 0, |
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76 | .len = (uint16_t) sizeof(out), |
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77 | .buf = &out[0] |
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78 | } |
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79 | }; |
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80 | |
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81 | return i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs)); |
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82 | } |
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83 | |
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84 | static int sensor_lm75a_get_reg_16( |
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85 | i2c_dev *dev, |
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86 | sensor_lm75a_ptr ptr, |
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87 | uint16_t *val |
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88 | ) |
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89 | { |
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90 | uint8_t out[1] = { ptr }; |
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91 | uint8_t in[sizeof(*val)]; |
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92 | i2c_msg msgs[2] = { |
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93 | { |
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94 | .addr = dev->address, |
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95 | .flags = 0, |
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96 | .len = (uint16_t) sizeof(out), |
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97 | .buf = &out[0] |
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98 | }, { |
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99 | .addr = dev->address, |
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100 | .flags = I2C_M_RD, |
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101 | .len = (uint16_t) sizeof(in), |
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102 | .buf = &in[0] |
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103 | } |
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104 | }; |
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105 | int err; |
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106 | |
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107 | err = i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs)); |
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108 | *val = (in[0] << 8) | in[1]; |
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109 | |
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110 | return err; |
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111 | } |
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112 | |
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113 | static int sensor_lm75a_set_reg_16( |
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114 | i2c_dev *dev, |
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115 | sensor_lm75a_ptr ptr, |
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116 | uint16_t val |
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117 | ) |
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118 | { |
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119 | uint8_t out[3] = { ptr, (uint8_t) (val >> 8), (uint8_t) val }; |
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120 | i2c_msg msgs[1] = { |
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121 | { |
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122 | .addr = dev->address, |
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123 | .flags = 0, |
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124 | .len = (uint16_t) sizeof(out), |
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125 | .buf = &out[0] |
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126 | } |
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127 | }; |
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128 | |
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129 | return i2c_bus_transfer(dev->bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs)); |
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130 | } |
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131 | |
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132 | static int sensor_lm75a_ioctl( |
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133 | i2c_dev *dev, |
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134 | ioctl_command_t command, |
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135 | void *arg |
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136 | ) |
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137 | { |
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138 | uint8_t v8 = (uint8_t) (uintptr_t) arg; |
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139 | uint16_t v16 = (uint16_t) (uintptr_t) arg; |
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140 | int err; |
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141 | |
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142 | switch (command) { |
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143 | case SENSOR_LM75A_GET_CONF: |
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144 | err = sensor_lm75a_get_reg_8(dev, SENSOR_LM75A_PTR_CONF, arg); |
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145 | break; |
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146 | case SENSOR_LM75A_SET_CONF: |
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147 | err = sensor_lm75a_set_reg_8(dev, SENSOR_LM75A_PTR_CONF, v8); |
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148 | break; |
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149 | case SENSOR_LM75A_CLEAR_AND_SET_CONF: |
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150 | i2c_bus_obtain(dev->bus); |
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151 | err = sensor_lm75a_get_reg_8(dev, SENSOR_LM75A_PTR_CONF, &v8); |
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152 | if (err == 0) { |
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153 | v8 &= ~((uint8_t) v16); |
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154 | v8 |= (uint8_t) (v16 >> 8); |
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155 | err = sensor_lm75a_set_reg_8(dev, SENSOR_LM75A_PTR_CONF, v8); |
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156 | } |
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157 | i2c_bus_release(dev->bus); |
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158 | break; |
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159 | case SENSOR_LM75A_GET_TEMP: |
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160 | err = sensor_lm75a_get_reg_16(dev, SENSOR_LM75A_PTR_TEMP, arg); |
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161 | break; |
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162 | case SENSOR_LM75A_GET_TOS: |
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163 | err = sensor_lm75a_get_reg_16(dev, SENSOR_LM75A_PTR_TOS, arg); |
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164 | break; |
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165 | case SENSOR_LM75A_SET_TOS: |
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166 | err = sensor_lm75a_set_reg_16(dev, SENSOR_LM75A_PTR_TOS, v16); |
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167 | break; |
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168 | case SENSOR_LM75A_GET_THYST: |
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169 | err = sensor_lm75a_get_reg_16(dev, SENSOR_LM75A_PTR_THYST, arg); |
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170 | break; |
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171 | case SENSOR_LM75A_SET_THYST: |
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172 | err = sensor_lm75a_set_reg_16(dev, SENSOR_LM75A_PTR_THYST, v16); |
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173 | break; |
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174 | default: |
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175 | err = -ENOTTY; |
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176 | break; |
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177 | } |
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178 | |
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179 | return err; |
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180 | } |
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181 | |
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182 | int i2c_dev_register_sensor_lm75a( |
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183 | const char *bus_path, |
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184 | const char *dev_path, |
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185 | uint16_t address |
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186 | ) |
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187 | { |
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188 | i2c_dev *dev; |
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189 | |
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190 | dev = i2c_dev_alloc_and_init(sizeof(*dev), bus_path, address); |
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191 | if (dev == NULL) { |
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192 | return -1; |
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193 | } |
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194 | |
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195 | dev->ioctl = sensor_lm75a_ioctl; |
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196 | |
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197 | return i2c_dev_register(dev, dev_path); |
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198 | } |
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