/* * ADT7310/ADT7310 digital temperature sensor driver * * Copyright 2012-2013 Analog Devices Inc. * Author: Lars-Peter Clausen <lars@metafoo.de> * * Licensed under the GPL-2 or later. */ #include <linux/module.h> #include <linux/init.h> #include <linux/spi/spi.h> #include <asm/unaligned.h> #include "adt7x10.h" #define ADT7310_STATUS 0 #define ADT7310_CONFIG 1 #define ADT7310_TEMPERATURE 2 #define ADT7310_ID 3 #define ADT7310_T_CRIT 4 #define ADT7310_T_HYST 5 #define ADT7310_T_ALARM_HIGH 6 #define ADT7310_T_ALARM_LOW 7 static const u8 adt7310_reg_table[] = { [ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE, [ADT7X10_STATUS] = ADT7310_STATUS, [ADT7X10_CONFIG] = ADT7310_CONFIG, [ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH, [ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW, [ADT7X10_T_CRIT] = ADT7310_T_CRIT, [ADT7X10_T_HYST] = ADT7310_T_HYST, [ADT7X10_ID] = ADT7310_ID, }; #define ADT7310_CMD_REG_OFFSET 3 #define ADT7310_CMD_READ 0x40 #define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET) static int adt7310_spi_read_word(struct device *dev, u8 reg) { struct spi_device *spi = to_spi_device(dev); int ret; ret = spi_w8r16(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); if (ret < 0) return ret; return be16_to_cpu((__force __be16)ret); } static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data) { struct spi_device *spi = to_spi_device(dev); u8 buf[3]; buf[0] = AD7310_COMMAND(reg); put_unaligned_be16(data, &buf[1]); return spi_write(spi, buf, sizeof(buf)); } static int adt7310_spi_read_byte(struct device *dev, u8 reg) { struct spi_device *spi = to_spi_device(dev); return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ); } static int adt7310_spi_write_byte(struct device *dev, u8 reg, u8 data) { struct spi_device *spi = to_spi_device(dev); u8 buf[2]; buf[0] = AD7310_COMMAND(reg); buf[1] = data; return spi_write(spi, buf, sizeof(buf)); } static const struct adt7x10_ops adt7310_spi_ops = { .read_word = adt7310_spi_read_word, .write_word = adt7310_spi_write_word, .read_byte = adt7310_spi_read_byte, .write_byte = adt7310_spi_write_byte, }; static int adt7310_spi_probe(struct spi_device *spi) { return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq, &adt7310_spi_ops); } static int adt7310_spi_remove(struct spi_device *spi) { return adt7x10_remove(&spi->dev, spi->irq); } static const struct spi_device_id adt7310_id[] = { { "adt7310", 0 }, { "adt7320", 0 }, {} }; MODULE_DEVICE_TABLE(spi, adt7310_id); static struct spi_driver adt7310_driver = { .driver = { .name = "adt7310", .owner = THIS_MODULE, .pm = ADT7X10_DEV_PM_OPS, }, .probe = adt7310_spi_probe, .remove = adt7310_spi_remove, .id_table = adt7310_id, }; module_spi_driver(adt7310_driver); MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); MODULE_DESCRIPTION("ADT7310/ADT7320 driver"); MODULE_LICENSE("GPL");