linux-imx
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#include <linux/slab.h>40
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#include <linux/of_device.h>41
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#define DRVNAME "lm70"44
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#define LM70_CHIP_LM70 0 /* original NS LM70 */46
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#define LM70_CHIP_TMP121 1 /* TI TMP121/TMP123 */47
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#define LM70_CHIP_LM71 2 /* NS LM71 */48
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#define LM70_CHIP_LM74 3 /* NS LM74 */49
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#define LM70_CHIP_TMP122 4 /* TI TMP122/TMP124 */49
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struct lm70 {51
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struct spi_device *spi;52
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struct mutex lock;53
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unsigned int chip;54
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};55
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/* sysfs hook function */57
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static ssize_t temp1_input_show(struct device *dev,58
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struct device_attribute *attr, char *buf)85
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* The "raw" temperature read into rxbuf[] is a 16-bit signed 2's86
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* complement value. Only the MSB 11 bits (1 sign + 10 temperature87
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* bits) are meaningful; the LSB 5 bits are to be discarded.88
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* See the datasheet.89
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*90
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* Further, each bit represents 0.25 degrees Celsius; so, multiply91
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* by 0.25. Also multiply by 1000 to represent in millidegrees92
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* Celsius.93
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* So it's equivalent to multiplying by 0.25 * 1000 = 250.94
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*95
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* LM74 and TMP121/TMP123:96
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* LM74 and TMP121/TMP122/TMP123/TMP124:96
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* 13 bits of 2's complement data, discard LSB 3 bits,97
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* resolution 0.0625 degrees celsius.98
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*99
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* LM71:100
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* 14 bits of 2's complement data, discard LSB 2 bits,101
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* resolution 0.0312 degrees celsius.102
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*/103
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switch (p_lm70->chip) {104
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case LM70_CHIP_LM70:105
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val = ((int)raw / 32) * 250;106
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break;107
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case LM70_CHIP_TMP121:110
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case LM70_CHIP_TMP122:109
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case LM70_CHIP_LM74:110
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val = ((int)raw / 8) * 625 / 10;111
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break;112
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case LM70_CHIP_LM71:114
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val = ((int)raw / 4) * 3125 / 100;115
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break;116
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}117
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status = sprintf(buf, "%d\n", val); /* millidegrees Celsius */135
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#ifdef CONFIG_OF136
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static const struct of_device_id lm70_of_ids[] = {137
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{138
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.compatible = "ti,lm70",139
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.data = (void *) LM70_CHIP_LM70,140
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},141
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{142
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.compatible = "ti,tmp121",143
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.data = (void *) LM70_CHIP_TMP121,144
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},147
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{148
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.compatible = "ti,tmp122",149
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.data = (void *) LM70_CHIP_TMP122,150
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},145
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{146
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.compatible = "ti,lm71",147
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.data = (void *) LM70_CHIP_LM71,148
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},149
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{150
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.compatible = "ti,lm74",151
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.data = (void *) LM70_CHIP_LM74,152
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},153
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{},154
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};184
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hwmon_dev = devm_hwmon_device_register_with_groups(&spi->dev,186
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spi->modalias,187
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p_lm70, lm70_groups);188
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return PTR_ERR_OR_ZERO(hwmon_dev);189
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}190
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static const struct spi_device_id lm70_ids[] = {192
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{ "lm70", LM70_CHIP_LM70 },193
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{ "tmp121", LM70_CHIP_TMP121 },200
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{ "tmp122", LM70_CHIP_TMP122 },194
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{ "lm71", LM70_CHIP_LM71 },195
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{ "lm74", LM70_CHIP_LM74 },196
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{ },197
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};198
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MODULE_DEVICE_TABLE(spi, lm70_ids);199
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static struct spi_driver lm70_driver = {201
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.driver = {202
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.name = "lm70",203
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.of_match_table = of_match_ptr(lm70_of_ids),