1 /* 2 * ADT7310/ADT7310 digital temperature sensor driver 3 * 4 * Copyright 2012-2013 Analog Devices Inc. 5 * Author: Lars-Peter Clausen <lars@metafoo.de> 6 * 7 * Licensed under the GPL-2 or later. 8 */ 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/spi/spi.h> 13 #include <asm/unaligned.h> 14 15 #include "adt7x10.h" 16 17 #define ADT7310_STATUS 0 18 #define ADT7310_CONFIG 1 19 #define ADT7310_TEMPERATURE 2 20 #define ADT7310_ID 3 21 #define ADT7310_T_CRIT 4 22 #define ADT7310_T_HYST 5 23 #define ADT7310_T_ALARM_HIGH 6 24 #define ADT7310_T_ALARM_LOW 7 25 26 static const u8 adt7310_reg_table[] = { 27 [ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE, 28 [ADT7X10_STATUS] = ADT7310_STATUS, 29 [ADT7X10_CONFIG] = ADT7310_CONFIG, 30 [ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH, 31 [ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW, 32 [ADT7X10_T_CRIT] = ADT7310_T_CRIT, 33 [ADT7X10_T_HYST] = ADT7310_T_HYST, 34 [ADT7X10_ID] = ADT7310_ID, 35 }; 36 37 #define ADT7310_CMD_REG_OFFSET 3 38 #define ADT7310_CMD_READ 0x40 39 40 #define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET) 41 42 static int adt7310_spi_read_word(struct device *dev, u8 reg) 43 { 44 struct spi_device *spi = to_spi_device(dev); 45 46 return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); 47 } 48 49 static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data) 50 { 51 struct spi_device *spi = to_spi_device(dev); 52 u8 buf[3]; 53 54 buf[0] = AD7310_COMMAND(reg); 55 put_unaligned_be16(data, &buf[1]); 56 57 return spi_write(spi, buf, sizeof(buf)); 58 } 59 60 static int adt7310_spi_read_byte(struct device *dev, u8 reg) 61 { 62 struct spi_device *spi = to_spi_device(dev); 63 64 return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); 65 } 66 67 static int adt7310_spi_write_byte(struct device *dev, u8 reg, 68 u8 data) 69 { 70 struct spi_device *spi = to_spi_device(dev); 71 u8 buf[2]; 72 73 buf[0] = AD7310_COMMAND(reg); 74 buf[1] = data; 75 76 return spi_write(spi, buf, sizeof(buf)); 77 } 78 79 static const struct adt7x10_ops adt7310_spi_ops = { 80 .read_word = adt7310_spi_read_word, 81 .write_word = adt7310_spi_write_word, 82 .read_byte = adt7310_spi_read_byte, 83 .write_byte = adt7310_spi_write_byte, 84 }; 85 86 static int adt7310_spi_probe(struct spi_device *spi) 87 { 88 return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq, 89 &adt7310_spi_ops); 90 } 91 92 static int adt7310_spi_remove(struct spi_device *spi) 93 { 94 return adt7x10_remove(&spi->dev, spi->irq); 95 } 96 97 static const struct spi_device_id adt7310_id[] = { 98 { "adt7310", 0 }, 99 { "adt7320", 0 }, 100 {} 101 }; 102 MODULE_DEVICE_TABLE(spi, adt7310_id); 103 104 static struct spi_driver adt7310_driver = { 105 .driver = { 106 .name = "adt7310", 107 .owner = THIS_MODULE, 108 .pm = ADT7X10_DEV_PM_OPS, 109 }, 110 .probe = adt7310_spi_probe, 111 .remove = adt7310_spi_remove, 112 .id_table = adt7310_id, 113 }; 114 module_spi_driver(adt7310_driver); 115 116 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); 117 MODULE_DESCRIPTION("ADT7310/ADT7320 driver"); 118 MODULE_LICENSE("GPL"); 119