drivers/hwmon/adt7310.c

Source file repositories/reference/linux-study-clean/drivers/hwmon/adt7310.c

File Facts

System
Linux kernel
Corpus path
drivers/hwmon/adt7310.c
Extension
.c
Size
3768 bytes
Lines
165
Domain
Driver Families
Bucket
drivers/hwmon
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * ADT7310/ADT7310 digital temperature sensor driver
 *
 * Copyright 2012-2013 Analog Devices Inc.
 *   Author: Lars-Peter Clausen <lars@metafoo.de>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/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 spi_device *spi, u8 reg)
{
	return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
}

static int adt7310_spi_write_word(struct spi_device *spi, u8 reg, u16 data)
{
	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 spi_device *spi, u8 reg)
{
	return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
}

static int adt7310_spi_write_byte(struct spi_device *spi, u8 reg, u8 data)
{
	u8 buf[2];

	buf[0] = AD7310_COMMAND(reg);
	buf[1] = data;

	return spi_write(spi, buf, sizeof(buf));
}

static bool adt7310_regmap_is_volatile(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case ADT7X10_TEMPERATURE:
	case ADT7X10_STATUS:
		return true;
	default:
		return false;
	}
}

static int adt7310_reg_read(void *context, unsigned int reg, unsigned int *val)
{
	struct spi_device *spi = context;
	int regval;

	switch (reg) {
	case ADT7X10_TEMPERATURE:
	case ADT7X10_T_ALARM_HIGH:

Annotation

Implementation Notes