165 lines
3.7 KiB
C
165 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/regmap.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 spi_device *spi, u8 reg)
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{
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return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
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}
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static int adt7310_spi_write_word(struct spi_device *spi, u8 reg, u16 data)
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{
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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 spi_device *spi, u8 reg)
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{
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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 spi_device *spi, u8 reg, u8 data)
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{
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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 bool adt7310_regmap_is_volatile(struct device *dev, unsigned int reg)
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{
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switch (reg) {
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case ADT7X10_TEMPERATURE:
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case ADT7X10_STATUS:
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return true;
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default:
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return false;
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}
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}
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static int adt7310_reg_read(void *context, unsigned int reg, unsigned int *val)
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{
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struct spi_device *spi = context;
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int regval;
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switch (reg) {
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case ADT7X10_TEMPERATURE:
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case ADT7X10_T_ALARM_HIGH:
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case ADT7X10_T_ALARM_LOW:
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case ADT7X10_T_CRIT:
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regval = adt7310_spi_read_word(spi, reg);
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break;
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default:
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regval = adt7310_spi_read_byte(spi, reg);
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break;
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}
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if (regval < 0)
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return regval;
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*val = regval;
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return 0;
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}
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static int adt7310_reg_write(void *context, unsigned int reg, unsigned int val)
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{
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struct spi_device *spi = context;
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int ret;
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switch (reg) {
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case ADT7X10_TEMPERATURE:
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case ADT7X10_T_ALARM_HIGH:
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case ADT7X10_T_ALARM_LOW:
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case ADT7X10_T_CRIT:
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ret = adt7310_spi_write_word(spi, reg, val);
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break;
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default:
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ret = adt7310_spi_write_byte(spi, reg, val);
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break;
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}
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return ret;
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}
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static const struct regmap_config adt7310_regmap_config = {
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.reg_bits = 8,
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.val_bits = 16,
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.cache_type = REGCACHE_MAPLE,
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.volatile_reg = adt7310_regmap_is_volatile,
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.reg_read = adt7310_reg_read,
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.reg_write = adt7310_reg_write,
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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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struct regmap *regmap;
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regmap = devm_regmap_init(&spi->dev, NULL, spi, &adt7310_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,
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regmap);
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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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.pm = pm_sleep_ptr(&adt7x10_dev_pm_ops),
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},
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.probe = adt7310_spi_probe,
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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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