// 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/spi/spi.h>
  #include <asm/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 device *dev, u8 reg)
  {
  	struct spi_device *spi = to_spi_device(dev);

  	return spi_w8r16be(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);

  }
  
  static int adt7310_spi_write_word(struct device *dev, u8 reg, u16 data)
  {
  	struct spi_device *spi = to_spi_device(dev);
  	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 device *dev, u8 reg)
  {
  	struct spi_device *spi = to_spi_device(dev);
  
  	return spi_w8r8(spi, AD7310_COMMAND(reg) | ADT7310_CMD_READ);
  }
  
  static int adt7310_spi_write_byte(struct device *dev, u8 reg,
  	u8 data)
  {
  	struct spi_device *spi = to_spi_device(dev);
  	u8 buf[2];
  
  	buf[0] = AD7310_COMMAND(reg);
  	buf[1] = data;
  
  	return spi_write(spi, buf, sizeof(buf));
  }
  
  static const struct adt7x10_ops adt7310_spi_ops = {
  	.read_word = adt7310_spi_read_word,
  	.write_word = adt7310_spi_write_word,
  	.read_byte = adt7310_spi_read_byte,
  	.write_byte = adt7310_spi_write_byte,
  };
  
  static int adt7310_spi_probe(struct spi_device *spi)
  {

  	return adt7x10_probe(&spi->dev, spi_get_device_id(spi)->name, spi->irq,

  			&adt7310_spi_ops);
  }
  
  static int adt7310_spi_remove(struct spi_device *spi)
  {

  	return adt7x10_remove(&spi->dev, spi->irq);

  }
  
  static const struct spi_device_id adt7310_id[] = {
  	{ "adt7310", 0 },
  	{ "adt7320", 0 },
  	{}
  };
  MODULE_DEVICE_TABLE(spi, adt7310_id);
  
  static struct spi_driver adt7310_driver = {
  	.driver = {
  		.name	= "adt7310",

  		.pm	= ADT7X10_DEV_PM_OPS,
  	},
  	.probe		= adt7310_spi_probe,
  	.remove		= adt7310_spi_remove,
  	.id_table	= adt7310_id,
  };
  module_spi_driver(adt7310_driver);
  
  MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
  MODULE_DESCRIPTION("ADT7310/ADT7320 driver");
  MODULE_LICENSE("GPL");