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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
* AD7314 digital temperature sensor driver for AD7314 , ADT7301 and ADT7302
*
* Copyright 2010 Analog Devices Inc .
*
* Conversion to hwmon from IIO done by Jonathan Cameron < jic23 @ cam . ac . uk >
*/
# include <linux/device.h>
# include <linux/kernel.h>
# include <linux/slab.h>
# include <linux/sysfs.h>
# include <linux/spi/spi.h>
# include <linux/module.h>
# include <linux/err.h>
# include <linux/hwmon.h>
# include <linux/hwmon-sysfs.h>
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# include <linux/bitops.h>
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/*
* AD7314 temperature masks
*/
# define AD7314_TEMP_MASK 0x7FE0
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# define AD7314_TEMP_SHIFT 5
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/*
* ADT7301 and ADT7302 temperature masks
*/
# define ADT7301_TEMP_MASK 0x3FFF
enum ad7314_variant {
adt7301 ,
adt7302 ,
ad7314 ,
} ;
struct ad7314_data {
struct spi_device * spi_dev ;
u16 rx ____cacheline_aligned ;
} ;
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static int ad7314_spi_read ( struct ad7314_data * chip )
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{
int ret ;
ret = spi_read ( chip - > spi_dev , ( u8 * ) & chip - > rx , sizeof ( chip - > rx ) ) ;
if ( ret < 0 ) {
dev_err ( & chip - > spi_dev - > dev , " SPI read error \n " ) ;
return ret ;
}
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return be16_to_cpu ( chip - > rx ) ;
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}
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static ssize_t ad7314_temperature_show ( struct device * dev ,
struct device_attribute * attr ,
char * buf )
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{
struct ad7314_data * chip = dev_get_drvdata ( dev ) ;
s16 data ;
int ret ;
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ret = ad7314_spi_read ( chip ) ;
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if ( ret < 0 )
return ret ;
switch ( spi_get_device_id ( chip - > spi_dev ) - > driver_data ) {
case ad7314 :
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data = ( ret & AD7314_TEMP_MASK ) > > AD7314_TEMP_SHIFT ;
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data = sign_extend32 ( data , 9 ) ;
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return sprintf ( buf , " %d \n " , 250 * data ) ;
case adt7301 :
case adt7302 :
/*
* Documented as a 13 bit twos complement register
* with a sign bit - which is a 14 bit 2 ' s complement
* register . 1l sb - 31.25 milli degrees centigrade
*/
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data = ret & ADT7301_TEMP_MASK ;
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data = sign_extend32 ( data , 13 ) ;
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return sprintf ( buf , " %d \n " ,
DIV_ROUND_CLOSEST ( data * 3125 , 100 ) ) ;
default :
return - EINVAL ;
}
}
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static SENSOR_DEVICE_ATTR_RO ( temp1_input , ad7314_temperature , 0 ) ;
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static struct attribute * ad7314_attrs [ ] = {
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& sensor_dev_attr_temp1_input . dev_attr . attr ,
NULL ,
} ;
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ATTRIBUTE_GROUPS ( ad7314 ) ;
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static int ad7314_probe ( struct spi_device * spi_dev )
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{
struct ad7314_data * chip ;
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struct device * hwmon_dev ;
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chip = devm_kzalloc ( & spi_dev - > dev , sizeof ( * chip ) , GFP_KERNEL ) ;
if ( chip = = NULL )
return - ENOMEM ;
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chip - > spi_dev = spi_dev ;
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hwmon_dev = devm_hwmon_device_register_with_groups ( & spi_dev - > dev ,
spi_dev - > modalias ,
chip , ad7314_groups ) ;
return PTR_ERR_OR_ZERO ( hwmon_dev ) ;
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}
static const struct spi_device_id ad7314_id [ ] = {
{ " adt7301 " , adt7301 } ,
{ " adt7302 " , adt7302 } ,
{ " ad7314 " , ad7314 } ,
{ }
} ;
MODULE_DEVICE_TABLE ( spi , ad7314_id ) ;
static struct spi_driver ad7314_driver = {
. driver = {
. name = " ad7314 " ,
} ,
. probe = ad7314_probe ,
. id_table = ad7314_id ,
} ;
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module_spi_driver ( ad7314_driver ) ;
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MODULE_AUTHOR ( " Sonic Zhang <sonic.zhang@analog.com> " ) ;
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MODULE_DESCRIPTION ( " Analog Devices AD7314, ADT7301 and ADT7302 digital temperature sensor driver " ) ;
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MODULE_LICENSE ( " GPL v2 " ) ;