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164 lines
3.7 KiB
164 lines
3.7 KiB
// 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 <[email protected]> |
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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_RBTREE, |
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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 = 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 <[email protected]>"); |
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MODULE_DESCRIPTION("ADT7310/ADT7320 driver"); |
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MODULE_LICENSE("GPL");
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