[linux-2.6-block.git] / drivers / hwmon / ad7314.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * 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>
#include <linux/bitops.h>

/*
 * AD7314 temperature masks
 */
#define AD7314_TEMP_MASK		0x7FE0
#define AD7314_TEMP_SHIFT		5

/*
 * 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;
};

static int ad7314_spi_read(struct ad7314_data *chip)
{
	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;
	}

	return be16_to_cpu(chip->rx);
}

static ssize_t ad7314_temperature_show(struct device *dev,
				       struct device_attribute *attr,
				       char *buf)
{
	struct ad7314_data *chip = dev_get_drvdata(dev);
	s16 data;
	int ret;

	ret = ad7314_spi_read(chip);
	if (ret < 0)
		return ret;
	switch (spi_get_device_id(chip->spi_dev)->driver_data) {
	case ad7314:
		data = (ret & AD7314_TEMP_MASK) >> AD7314_TEMP_SHIFT;
		data = sign_extend32(data, 9);

		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.  1lsb - 31.25 milli degrees centigrade
		 */
		data = ret & ADT7301_TEMP_MASK;
		data = sign_extend32(data, 13);

		return sprintf(buf, "%d\n",
			       DIV_ROUND_CLOSEST(data * 3125, 100));
	default:
		return -EINVAL;
	}
}

static SENSOR_DEVICE_ATTR_RO(temp1_input, ad7314_temperature, 0);

static struct attribute *ad7314_attrs[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	NULL,
};

ATTRIBUTE_GROUPS(ad7314);

static int ad7314_probe(struct spi_device *spi_dev)
{
	struct ad7314_data *chip;
	struct device *hwmon_dev;

	chip = devm_kzalloc(&spi_dev->dev, sizeof(*chip), GFP_KERNEL);
	if (chip == NULL)
		return -ENOMEM;

	chip->spi_dev = spi_dev;
	hwmon_dev = devm_hwmon_device_register_with_groups(&spi_dev->dev,
							   spi_dev->modalias,
							   chip, ad7314_groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

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,
};

module_spi_driver(ad7314_driver);

MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD7314, ADT7301 and ADT7302 digital temperature sensor driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
80503b23	1	// SPDX-License-Identifier: GPL-2.0-or-later
4f3a6595 JC	2	/*
	3	* AD7314 digital temperature sensor driver for AD7314, ADT7301 and ADT7302
	4	*
	5	* Copyright 2010 Analog Devices Inc.
	6	*
4f3a6595 JC	7	* Conversion to hwmon from IIO done by Jonathan Cameron <jic23@cam.ac.uk>
	8	*/
	9	#include <linux/device.h>
	10	#include <linux/kernel.h>
	11	#include <linux/slab.h>
	12	#include <linux/sysfs.h>
	13	#include <linux/spi/spi.h>
	14	#include <linux/module.h>
	15	#include <linux/err.h>
	16	#include <linux/hwmon.h>
	17	#include <linux/hwmon-sysfs.h>
984faa1f	18	#include <linux/bitops.h>
4f3a6595	19
4f3a6595 JC	20	/*
	21	* AD7314 temperature masks
	22	*/
4f3a6595	23	#define AD7314_TEMP_MASK 0x7FE0
1137a9a6	24	#define AD7314_TEMP_SHIFT 5
4f3a6595 JC	25
	26	/*
	27	* ADT7301 and ADT7302 temperature masks
	28	*/
4f3a6595 JC	29	#define ADT7301_TEMP_MASK 0x3FFF
	30
	31	enum ad7314_variant {
	32	adt7301,
	33	adt7302,
	34	ad7314,
	35	};
	36
	37	struct ad7314_data {
	38	struct spi_device *spi_dev;
4f3a6595 JC	39	u16 rx ____cacheline_aligned;
	40	};
	41
eae1415d	42	static int ad7314_spi_read(struct ad7314_data *chip)
4f3a6595 JC	43	{
	44	int ret;
	45
	46	ret = spi_read(chip->spi_dev, (u8 *)&chip->rx, sizeof(chip->rx));
	47	if (ret < 0) {
	48	dev_err(&chip->spi_dev->dev, "SPI read error\n");
	49	return ret;
	50	}
	51
eae1415d	52	return be16_to_cpu(chip->rx);
4f3a6595 JC	53	}
4f3a6595 JC	54
1ba3e023 GR	55	static ssize_t ad7314_temperature_show(struct device *dev,
	56	struct device_attribute *attr,
	57	char *buf)
4f3a6595 JC	58	{
	59	struct ad7314_data *chip = dev_get_drvdata(dev);
	60	s16 data;
	61	int ret;
	62
eae1415d	63	ret = ad7314_spi_read(chip);
4f3a6595 JC	64	if (ret < 0)
	65	return ret;
	66	switch (spi_get_device_id(chip->spi_dev)->driver_data) {
	67	case ad7314:
1137a9a6	68	data = (ret & AD7314_TEMP_MASK) >> AD7314_TEMP_SHIFT;
984faa1f	69	data = sign_extend32(data, 9);
4f3a6595 JC	70
	71	return sprintf(buf, "%d\n", 250 * data);
	72	case adt7301:
	73	case adt7302:
	74	/*
	75	* Documented as a 13 bit twos complement register
	76	* with a sign bit - which is a 14 bit 2's complement
	77	* register. 1lsb - 31.25 milli degrees centigrade
	78	*/
eae1415d	79	data = ret & ADT7301_TEMP_MASK;
984faa1f	80	data = sign_extend32(data, 13);
4f3a6595 JC	81
	82	return sprintf(buf, "%d\n",
	83	DIV_ROUND_CLOSEST(data * 3125, 100));
	84	default:
	85	return -EINVAL;
	86	}
	87	}
	88
1ba3e023	89	static SENSOR_DEVICE_ATTR_RO(temp1_input, ad7314_temperature, 0);
4f3a6595	90
157926c0	91	static struct attribute *ad7314_attrs[] = {
4f3a6595 JC	92	&sensor_dev_attr_temp1_input.dev_attr.attr,
	93	NULL,
	94	};
	95
157926c0	96	ATTRIBUTE_GROUPS(ad7314);
4f3a6595	97
6c931ae1	98	static int ad7314_probe(struct spi_device *spi_dev)
4f3a6595	99	{
4f3a6595	100	struct ad7314_data *chip;
157926c0	101	struct device *hwmon_dev;
4f3a6595	102
be923040 GR	103	chip = devm_kzalloc(&spi_dev->dev, sizeof(*chip), GFP_KERNEL);
	104	if (chip == NULL)
	105	return -ENOMEM;
	106
e16de913	107	chip->spi_dev = spi_dev;
157926c0 AL	108	hwmon_dev = devm_hwmon_device_register_with_groups(&spi_dev->dev,
	109	spi_dev->modalias,
	110	chip, ad7314_groups);
	111	return PTR_ERR_OR_ZERO(hwmon_dev);
4f3a6595 JC	112	}
	113
	114	static const struct spi_device_id ad7314_id[] = {
	115	{ "adt7301", adt7301 },
	116	{ "adt7302", adt7302 },
	117	{ "ad7314", ad7314 },
	118	{ }
	119	};
	120	MODULE_DEVICE_TABLE(spi, ad7314_id);
	121
	122	static struct spi_driver ad7314_driver = {
	123	.driver = {
	124	.name = "ad7314",
4f3a6595 JC	125	},
4f3a6595 JC	126	.probe = ad7314_probe,
4f3a6595 JC	127	.id_table = ad7314_id,
	128	};
	129
91efffe2	130	module_spi_driver(ad7314_driver);
4f3a6595 JC	131
4f3a6595 JC	132	MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
b55f3757	133	MODULE_DESCRIPTION("Analog Devices AD7314, ADT7301 and ADT7302 digital temperature sensor driver");
4f3a6595	134	MODULE_LICENSE("GPL v2");