1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ADT7310/ADT7310 digital temperature sensor driver 4 * 5 * Copyright 2012-2013 Analog Devices Inc. 6 * Author: Lars-Peter Clausen <lars@metafoo.de> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/spi/spi.h> 12 #include <asm/unaligned.h> 13 14 #include "adt7x10.h" 15 16 #define ADT7310_STATUS 0 17 #define ADT7310_CONFIG 1 18 #define ADT7310_TEMPERATURE 2 19 #define ADT7310_ID 3 20 #define ADT7310_T_CRIT 4 21 #define ADT7310_T_HYST 5 22 #define ADT7310_T_ALARM_HIGH 6 23 #define ADT7310_T_ALARM_LOW 7 24 25 static const u8 adt7310_reg_table[] = { 26 [ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE, 27 [ADT7X10_STATUS] = ADT7310_STATUS, 28 [ADT7X10_CONFIG] = ADT7310_CONFIG, 29 [ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH, 30 [ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW, 31 [ADT7X10_T_CRIT] = ADT7310_T_CRIT, 32 [ADT7X10_T_HYST] = ADT7310_T_HYST, 33 [ADT7X10_ID] = ADT7310_ID, 34 }; 35 36 #define ADT7310_CMD_REG_OFFSET 3 37 #define ADT7310_CMD_READ 0x40 38 39 #define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET) 40 41 static int adt7310_spi_read_word(struct device *dev, u8 reg) 42 { 43 struct spi_device *spi = to_spi_device(dev); 44 45 return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); 46 } 47 48 static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data) 49 { 50 struct spi_device *spi = to_spi_device(dev); 51 u8 buf[3]; 52 53 buf[0] = AD7310_COMMAND(reg); 54 put_unaligned_be16(data, &buf[1]); 55 56 return spi_write(spi, buf, sizeof(buf)); 57 } 58 59 static int adt7310_spi_read_byte(struct device *dev, u8 reg) 60 { 61 struct spi_device *spi = to_spi_device(dev); 62 63 return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); 64 } 65 66 static int adt7310_spi_write_byte(struct device *dev, u8 reg, 67 u8 data) 68 { 69 struct spi_device *spi = to_spi_device(dev); 70 u8 buf[2]; 71 72 buf[0] = AD7310_COMMAND(reg); 73 buf[1] = data; 74 75 return spi_write(spi, buf, sizeof(buf)); 76 } 77 78 static const struct adt7x10_ops adt7310_spi_ops = { 79 .read_word = adt7310_spi_read_word, 80 .write_word = adt7310_spi_write_word, 81 .read_byte = adt7310_spi_read_byte, 82 .write_byte = adt7310_spi_write_byte, 83 }; 84 85 static int adt7310_spi_probe(struct spi_device *spi) 86 { 87 return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq, 88 &adt7310_spi_ops); 89 } 90 91 static int adt7310_spi_remove(struct spi_device *spi) 92 { 93 return adt7x10_remove(&spi->dev, spi->irq); 94 } 95 96 static const struct spi_device_id adt7310_id[] = { 97 { "adt7310", 0 }, 98 { "adt7320", 0 }, 99 {} 100 }; 101 MODULE_DEVICE_TABLE(spi, adt7310_id); 102 103 static struct spi_driver adt7310_driver = { 104 .driver = { 105 .name = "adt7310", 106 .pm = ADT7X10_DEV_PM_OPS, 107 }, 108 .probe = adt7310_spi_probe, 109 .remove = adt7310_spi_remove, 110 .id_table = adt7310_id, 111 }; 112 module_spi_driver(adt7310_driver); 113 114 MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); 115 MODULE_DESCRIPTION("ADT7310/ADT7320 driver"); 116 MODULE_LICENSE("GPL"); 117