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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * ADT7310/ADT7310 digital temperature sensor driver4 *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/regmap.h>12#include <linux/spi/spi.h>13#include <linux/unaligned.h>14 15#include "adt7x10.h"16 17#define ADT7310_STATUS 018#define ADT7310_CONFIG 119#define ADT7310_TEMPERATURE 220#define ADT7310_ID 321#define ADT7310_T_CRIT 422#define ADT7310_T_HYST 523#define ADT7310_T_ALARM_HIGH 624#define ADT7310_T_ALARM_LOW 725 26static 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 338#define ADT7310_CMD_READ 0x4039 40#define AD7310_COMMAND(reg) (adt7310_reg_table[(reg)] << ADT7310_CMD_REG_OFFSET)41 42static int adt7310_spi_read_word(struct spi_device *spi, u8 reg)43{44 return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);45}46 47static int adt7310_spi_write_word(struct spi_device *spi, u8 reg, u16 data)48{49 u8 buf[3];50 51 buf[0] = AD7310_COMMAND(reg);52 put_unaligned_be16(data, &buf[1]);53 54 return spi_write(spi, buf, sizeof(buf));55}56 57static int adt7310_spi_read_byte(struct spi_device *spi, u8 reg)58{59 return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);60}61 62static int adt7310_spi_write_byte(struct spi_device *spi, u8 reg, u8 data)63{64 u8 buf[2];65 66 buf[0] = AD7310_COMMAND(reg);67 buf[1] = data;68 69 return spi_write(spi, buf, sizeof(buf));70}71 72static bool adt7310_regmap_is_volatile(struct device *dev, unsigned int reg)73{74 switch (reg) {75 case ADT7X10_TEMPERATURE:76 case ADT7X10_STATUS:77 return true;78 default:79 return false;80 }81}82 83static int adt7310_reg_read(void *context, unsigned int reg, unsigned int *val)84{85 struct spi_device *spi = context;86 int regval;87 88 switch (reg) {89 case ADT7X10_TEMPERATURE:90 case ADT7X10_T_ALARM_HIGH:91 case ADT7X10_T_ALARM_LOW:92 case ADT7X10_T_CRIT:93 regval = adt7310_spi_read_word(spi, reg);94 break;95 default:96 regval = adt7310_spi_read_byte(spi, reg);97 break;98 }99 if (regval < 0)100 return regval;101 *val = regval;102 return 0;103}104 105static int adt7310_reg_write(void *context, unsigned int reg, unsigned int val)106{107 struct spi_device *spi = context;108 int ret;109 110 switch (reg) {111 case ADT7X10_TEMPERATURE:112 case ADT7X10_T_ALARM_HIGH:113 case ADT7X10_T_ALARM_LOW:114 case ADT7X10_T_CRIT:115 ret = adt7310_spi_write_word(spi, reg, val);116 break;117 default:118 ret = adt7310_spi_write_byte(spi, reg, val);119 break;120 }121 return ret;122}123 124static const struct regmap_config adt7310_regmap_config = {125 .reg_bits = 8,126 .val_bits = 16,127 .cache_type = REGCACHE_MAPLE,128 .volatile_reg = adt7310_regmap_is_volatile,129 .reg_read = adt7310_reg_read,130 .reg_write = adt7310_reg_write,131};132 133static int adt7310_spi_probe(struct spi_device *spi)134{135 struct regmap *regmap;136 137 regmap = devm_regmap_init(&spi->dev, NULL, spi, &adt7310_regmap_config);138 if (IS_ERR(regmap))139 return PTR_ERR(regmap);140 141 return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,142 regmap);143}144 145static const struct spi_device_id adt7310_id[] = {146 { "adt7310", 0 },147 { "adt7320", 0 },148 {}149};150MODULE_DEVICE_TABLE(spi, adt7310_id);151 152static struct spi_driver adt7310_driver = {153 .driver = {154 .name = "adt7310",155 .pm = pm_sleep_ptr(&adt7x10_dev_pm_ops),156 },157 .probe = adt7310_spi_probe,158 .id_table = adt7310_id,159};160module_spi_driver(adt7310_driver);161 162MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");163MODULE_DESCRIPTION("ADT7310/ADT7320 driver");164MODULE_LICENSE("GPL");165