forked from luck/tmp_suning_uos_patched
4b5e536b0e
This allows an userspace application to poll() on the alarm files to get notified in case of a temperature threshold event. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Reviewed-by: Hartmut Knaack <knaack.h@gmx.de> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
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* ADT7310/ADT7310 digital temperature sensor driver
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*
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* Copyright 2012-2013 Analog Devices Inc.
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* Author: Lars-Peter Clausen <lars@metafoo.de>
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/spi/spi.h>
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#include <asm/unaligned.h>
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#include "adt7x10.h"
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#define ADT7310_STATUS 0
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#define ADT7310_CONFIG 1
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#define ADT7310_TEMPERATURE 2
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#define ADT7310_ID 3
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#define ADT7310_T_CRIT 4
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#define ADT7310_T_HYST 5
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#define ADT7310_T_ALARM_HIGH 6
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#define ADT7310_T_ALARM_LOW 7
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static const u8 adt7310_reg_table[] = {
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[ADT7X10_TEMPERATURE] = ADT7310_TEMPERATURE,
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[ADT7X10_STATUS] = ADT7310_STATUS,
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[ADT7X10_CONFIG] = ADT7310_CONFIG,
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[ADT7X10_T_ALARM_HIGH] = ADT7310_T_ALARM_HIGH,
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[ADT7X10_T_ALARM_LOW] = ADT7310_T_ALARM_LOW,
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[ADT7X10_T_CRIT] = ADT7310_T_CRIT,
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[ADT7X10_T_HYST] = ADT7310_T_HYST,
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[ADT7X10_ID] = ADT7310_ID,
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};
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#define ADT7310_CMD_REG_OFFSET 3
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#define ADT7310_CMD_READ 0x40
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#define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)
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static int adt7310_spi_read_word(struct device *dev, u8 reg)
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{
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struct spi_device *spi = to_spi_device(dev);
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int ret;
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ret = spi_w8r16(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
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if (ret < 0)
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return ret;
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return be16_to_cpu(ret);
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}
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static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
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{
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struct spi_device *spi = to_spi_device(dev);
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u8 buf[3];
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buf[0] = AD7310_COMMAND(reg);
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put_unaligned_be16(data, &buf[1]);
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return spi_write(spi, buf, sizeof(buf));
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}
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static int adt7310_spi_read_byte(struct device *dev, u8 reg)
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{
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struct spi_device *spi = to_spi_device(dev);
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return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
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}
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static int adt7310_spi_write_byte(struct device *dev, u8 reg,
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u8 data)
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{
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struct spi_device *spi = to_spi_device(dev);
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u8 buf[2];
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buf[0] = AD7310_COMMAND(reg);
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buf[1] = data;
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return spi_write(spi, buf, sizeof(buf));
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}
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static const struct adt7x10_ops adt7310_spi_ops = {
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.read_word = adt7310_spi_read_word,
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.write_word = adt7310_spi_write_word,
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.read_byte = adt7310_spi_read_byte,
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.write_byte = adt7310_spi_write_byte,
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};
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static int adt7310_spi_probe(struct spi_device *spi)
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{
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return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
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&adt7310_spi_ops);
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}
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static int adt7310_spi_remove(struct spi_device *spi)
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{
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return adt7x10_remove(&spi->dev, spi->irq);
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}
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static const struct spi_device_id adt7310_id[] = {
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{ "adt7310", 0 },
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{ "adt7320", 0 },
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{}
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};
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MODULE_DEVICE_TABLE(spi, adt7310_id);
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static struct spi_driver adt7310_driver = {
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.driver = {
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.name = "adt7310",
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.owner = THIS_MODULE,
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.pm = ADT7X10_DEV_PM_OPS,
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},
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.probe = adt7310_spi_probe,
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.remove = adt7310_spi_remove,
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.id_table = adt7310_id,
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};
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module_spi_driver(adt7310_driver);
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MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
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MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
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MODULE_LICENSE("GPL");
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