| Lars-Peter Clausen | 51c2a48 | 2013-03-12 11:38:46 +0100 | [diff] [blame^] | 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 | int ret; |
| 46 | |
| 47 | ret = spi_w8r16(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); |
| 48 | if (ret < 0) |
| 49 | return ret; |
| 50 | |
| 51 | return be16_to_cpu(ret); |
| 52 | } |
| 53 | |
| 54 | static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data) |
| 55 | { |
| 56 | struct spi_device *spi = to_spi_device(dev); |
| 57 | u8 buf[3]; |
| 58 | |
| 59 | buf[0] = AD7310_COMMAND(reg); |
| 60 | put_unaligned_be16(data, &buf[1]); |
| 61 | |
| 62 | return spi_write(spi, buf, sizeof(buf)); |
| 63 | } |
| 64 | |
| 65 | static int adt7310_spi_read_byte(struct device *dev, u8 reg) |
| 66 | { |
| 67 | struct spi_device *spi = to_spi_device(dev); |
| 68 | |
| 69 | return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); |
| 70 | } |
| 71 | |
| 72 | static int adt7310_spi_write_byte(struct device *dev, u8 reg, |
| 73 | u8 data) |
| 74 | { |
| 75 | struct spi_device *spi = to_spi_device(dev); |
| 76 | u8 buf[2]; |
| 77 | |
| 78 | buf[0] = AD7310_COMMAND(reg); |
| 79 | buf[1] = data; |
| 80 | |
| 81 | return spi_write(spi, buf, sizeof(buf)); |
| 82 | } |
| 83 | |
| 84 | static const struct adt7x10_ops adt7310_spi_ops = { |
| 85 | .read_word = adt7310_spi_read_word, |
| 86 | .write_word = adt7310_spi_write_word, |
| 87 | .read_byte = adt7310_spi_read_byte, |
| 88 | .write_byte = adt7310_spi_write_byte, |
| 89 | }; |
| 90 | |
| 91 | static int adt7310_spi_probe(struct spi_device *spi) |
| 92 | { |
| 93 | return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, |
| 94 | &adt7310_spi_ops); |
| 95 | } |
| 96 | |
| 97 | static int adt7310_spi_remove(struct spi_device *spi) |
| 98 | { |
| 99 | return adt7x10_remove(&spi->dev); |
| 100 | } |
| 101 | |
| 102 | static const struct spi_device_id adt7310_id[] = { |
| 103 | { "adt7310", 0 }, |
| 104 | { "adt7320", 0 }, |
| 105 | {} |
| 106 | }; |
| 107 | MODULE_DEVICE_TABLE(spi, adt7310_id); |
| 108 | |
| 109 | static struct spi_driver adt7310_driver = { |
| 110 | .driver = { |
| 111 | .name = "adt7310", |
| 112 | .owner = THIS_MODULE, |
| 113 | .pm = ADT7X10_DEV_PM_OPS, |
| 114 | }, |
| 115 | .probe = adt7310_spi_probe, |
| 116 | .remove = adt7310_spi_remove, |
| 117 | .id_table = adt7310_id, |
| 118 | }; |
| 119 | module_spi_driver(adt7310_driver); |
| 120 | |
| 121 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); |
| 122 | MODULE_DESCRIPTION("ADT7310/ADT7320 driver"); |
| 123 | MODULE_LICENSE("GPL"); |