1 | /* |
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2 | * Copyright (c) 2016-2017 Chris Johns <chrisj@rtems.org> |
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3 | * All rights reserved. |
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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.org/license/LICENSE. |
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8 | */ |
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9 | |
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10 | #if HAVE_CONFIG_H |
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11 | #include "config.h" |
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12 | #endif |
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13 | |
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14 | #include <stdio.h> |
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15 | |
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16 | #include <dev/i2c/i2c.h> |
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17 | #include <dev/i2c/ti-tmp112.h> |
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18 | |
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19 | /* |
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20 | * Registers. |
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21 | */ |
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22 | #define TMP_TEMPERATURE (0) |
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23 | #define TMP_CONFIG (1) |
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24 | #define TMP_LOW_TEMP (2) |
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25 | #define TMP_HIGH_TEMP (3) |
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26 | |
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27 | /* |
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28 | * Configuration register. |
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29 | */ |
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30 | #define CFG_ONE_SHOT_BASE (15) |
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31 | #define CFG_SHUTDOWN_BASE (8) |
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32 | #define CFG_EXTENDED_MODE_BASE (4) |
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33 | |
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34 | #define CFG_ONE_SHOT (1 << CFG_ONE_SHOT_BASE) |
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35 | #define CFG_SHUTDOWN (1 << CFG_SHUTDOWN_BASE) |
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36 | #define CFG_EXTENDED_MODE (1 << CFG_EXTENDED_MODE_BASE) |
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37 | |
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38 | typedef struct { |
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39 | i2c_dev base; |
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40 | uint8_t pointer; |
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41 | uint16_t config_shadow; |
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42 | } ti_tmp112; |
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43 | |
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44 | static int |
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45 | ti_tmp112_reg_write(ti_tmp112* dev, int reg, uint16_t value) |
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46 | { |
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47 | uint8_t out[3]; |
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48 | i2c_msg msgs[1] = { |
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49 | { |
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50 | .addr = dev->base.address, |
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51 | .flags = 0, |
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52 | .len = (uint16_t) sizeof(out), |
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53 | .buf = &out[0] |
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54 | } |
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55 | }; |
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56 | int err; |
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57 | if (dev->pointer == reg) { |
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58 | out[0] = (uint8_t) (value >> 8); |
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59 | out[1] = (uint8_t) value; |
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60 | msgs[0].len = 2; |
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61 | } |
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62 | else { |
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63 | out[0] = reg; |
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64 | out[1] = (uint8_t) (value >> 8); |
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65 | out[2] = (uint8_t) value; |
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66 | } |
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67 | err = i2c_bus_transfer(dev->base.bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs)); |
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68 | if (err == 0) |
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69 | dev->pointer = reg; |
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70 | else |
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71 | dev->pointer = -1; |
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72 | return err; |
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73 | } |
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74 | |
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75 | static int |
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76 | ti_tmp112_reg_read(ti_tmp112* dev, int reg, uint16_t* value) |
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77 | { |
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78 | uint8_t in[2] = { 0, 0 }; |
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79 | int err; |
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80 | if (dev->pointer == reg) { |
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81 | i2c_msg msgs[1] = { |
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82 | { |
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83 | .addr = dev->base.address, |
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84 | .flags = I2C_M_RD, |
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85 | .len = (uint16_t) sizeof(in), |
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86 | .buf = &in[0] |
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87 | } |
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88 | }; |
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89 | err = i2c_bus_transfer(dev->base.bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs)); |
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90 | } |
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91 | else { |
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92 | uint8_t out[1] = { (uint8_t) reg }; |
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93 | i2c_msg msgs[2] = { |
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94 | { |
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95 | .addr = dev->base.address, |
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96 | .flags = 0, |
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97 | .len = (uint16_t) sizeof(out), |
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98 | .buf = &out[0] |
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99 | }, { |
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100 | .addr = dev->base.address, |
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101 | .flags = I2C_M_RD, |
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102 | .len = (uint16_t) sizeof(in), |
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103 | .buf = &in[0] |
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104 | } |
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105 | }; |
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106 | err = i2c_bus_transfer(dev->base.bus, &msgs[0], RTEMS_ARRAY_SIZE(msgs)); |
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107 | if (err == 0) |
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108 | dev->pointer = reg; |
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109 | else |
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110 | dev->pointer = -1; |
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111 | } |
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112 | *value = (((uint16_t) in[0]) << 8) | in[1]; |
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113 | return err; |
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114 | } |
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115 | |
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116 | static int |
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117 | ti_tmp112_set_config(ti_tmp112* dev, uint16_t value) |
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118 | { |
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119 | int err; |
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120 | dev->config_shadow = value; |
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121 | err = ti_tmp112_reg_write(dev, TMP_CONFIG, dev->config_shadow); |
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122 | return err; |
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123 | } |
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124 | |
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125 | static int |
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126 | ti_tmp112_get_temp(ti_tmp112* dev, int* temp, bool raw) |
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127 | { |
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128 | uint16_t value = 0; |
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129 | int err; |
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130 | |
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131 | *temp = 0; |
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132 | |
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133 | if ((dev->config_shadow & CFG_SHUTDOWN) == CFG_SHUTDOWN) { |
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134 | i2c_bus_obtain(dev->base.bus); |
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135 | err = ti_tmp112_reg_write(dev, |
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136 | TMP_CONFIG, |
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137 | dev->config_shadow | CFG_ONE_SHOT); |
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138 | if (err == 0) { |
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139 | uint16_t config = 0; |
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140 | while (err == 0 && (config & CFG_ONE_SHOT) == 0) |
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141 | err = ti_tmp112_reg_read(dev, TMP_CONFIG, &config); |
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142 | err = ti_tmp112_reg_read(dev, TMP_TEMPERATURE, &value); |
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143 | } |
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144 | i2c_bus_release(dev->base.bus); |
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145 | } |
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146 | else { |
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147 | err = ti_tmp112_reg_read(dev, TMP_TEMPERATURE, &value); |
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148 | } |
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149 | |
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150 | if (err == 0) { |
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151 | if (raw) { |
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152 | *temp = (int) value; |
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153 | } |
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154 | else { |
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155 | int bits = 12; |
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156 | uint32_t u; |
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157 | if ((dev->config_shadow & CFG_EXTENDED_MODE) != 0) |
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158 | bits = 13; |
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159 | u = value >> ((sizeof(value) * 8) - bits); |
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160 | *temp = (int) (u & ((1 << bits) - 1)); |
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161 | if ((u & (1 << (bits - 1))) != 0) |
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162 | *temp |= ~((1 << bits) - 1); |
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163 | *temp = *temp * 625; |
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164 | } |
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165 | } |
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166 | |
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167 | return err; |
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168 | } |
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169 | |
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170 | static int |
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171 | ti_tmp112_ioctl(i2c_dev* iic_dev, ioctl_command_t command, void* arg) |
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172 | { |
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173 | ti_tmp112* dev = (ti_tmp112*) iic_dev; |
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174 | uint16_t v16; |
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175 | int vint; |
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176 | int err; |
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177 | |
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178 | switch (command) { |
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179 | case TI_TMP112_GET_TEMP: |
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180 | vint = 0; |
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181 | err = ti_tmp112_get_temp(dev, &vint, false); |
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182 | if (err == 0) |
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183 | *((int*) arg) = vint; |
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184 | break; |
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185 | case TI_TMP112_GET_TEMP_RAW: |
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186 | vint = 0; |
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187 | err = ti_tmp112_get_temp(dev, &vint, true); |
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188 | if (err == 0) |
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189 | *((uint16_t*) arg) = (uint16_t) vint; |
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190 | break; |
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191 | case TI_TMP112_SET_CONFIG: |
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192 | v16 = (uint16_t)(uintptr_t) arg; |
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193 | err = ti_tmp112_set_config(dev, v16); |
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194 | break; |
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195 | case TI_TMP112_SET_LOW_TEMP: |
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196 | v16 = (uint16_t)(uintptr_t) arg; |
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197 | err = ti_tmp112_reg_write(dev, TMP_LOW_TEMP, v16); |
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198 | break; |
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199 | case TI_TMP112_SET_HIGH_TEMP: |
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200 | v16 = (uint16_t)(uintptr_t) arg; |
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201 | err = ti_tmp112_reg_write(dev, TMP_HIGH_TEMP, v16); |
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202 | break; |
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203 | default: |
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204 | err = -ENOTTY; |
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205 | break; |
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206 | } |
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207 | |
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208 | return err; |
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209 | } |
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210 | |
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211 | int |
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212 | i2c_dev_register_ti_tmp112(const char* bus_path, |
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213 | const char* dev_path, |
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214 | uint16_t address) |
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215 | { |
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216 | ti_tmp112* dev; |
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217 | |
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218 | dev = (ti_tmp112*) |
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219 | i2c_dev_alloc_and_init(sizeof(*dev), bus_path, address); |
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220 | if (dev == NULL) { |
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221 | return -1; |
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222 | } |
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223 | |
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224 | dev->base.ioctl = ti_tmp112_ioctl; |
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225 | dev->pointer = -1; |
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226 | dev->config_shadow = 0x60a0; |
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227 | |
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228 | return i2c_dev_register(&dev->base, dev_path); |
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229 | } |
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