^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * AD7314 digital temperature sensor driver for AD7314, ADT7301 and ADT7302
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright 2010 Analog Devices Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Conversion to hwmon from IIO done by Jonathan Cameron <jic23@cam.ac.uk>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/spi/spi.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/hwmon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/hwmon-sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/bitops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * AD7314 temperature masks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define AD7314_TEMP_MASK 0x7FE0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define AD7314_TEMP_SHIFT 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * ADT7301 and ADT7302 temperature masks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #define ADT7301_TEMP_MASK 0x3FFF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) enum ad7314_variant {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) adt7301,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) adt7302,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) ad7314,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct ad7314_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct spi_device *spi_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) u16 rx ____cacheline_aligned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) static int ad7314_spi_read(struct ad7314_data *chip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) ret = spi_read(chip->spi_dev, (u8 *)&chip->rx, sizeof(chip->rx));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) dev_err(&chip->spi_dev->dev, "SPI read error\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return be16_to_cpu(chip->rx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) static ssize_t ad7314_temperature_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct ad7314_data *chip = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) s16 data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) ret = ad7314_spi_read(chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) switch (spi_get_device_id(chip->spi_dev)->driver_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) case ad7314:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) data = (ret & AD7314_TEMP_MASK) >> AD7314_TEMP_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) data = sign_extend32(data, 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return sprintf(buf, "%d\n", 250 * data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) case adt7301:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) case adt7302:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * Documented as a 13 bit twos complement register
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * with a sign bit - which is a 14 bit 2's complement
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * register. 1lsb - 31.25 milli degrees centigrade
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) data = ret & ADT7301_TEMP_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) data = sign_extend32(data, 13);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) return sprintf(buf, "%d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) DIV_ROUND_CLOSEST(data * 3125, 100));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) static SENSOR_DEVICE_ATTR_RO(temp1_input, ad7314_temperature, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) static struct attribute *ad7314_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) &sensor_dev_attr_temp1_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) ATTRIBUTE_GROUPS(ad7314);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) static int ad7314_probe(struct spi_device *spi_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) struct ad7314_data *chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) struct device *hwmon_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) chip = devm_kzalloc(&spi_dev->dev, sizeof(*chip), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) if (chip == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) chip->spi_dev = spi_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) hwmon_dev = devm_hwmon_device_register_with_groups(&spi_dev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) spi_dev->modalias,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) chip, ad7314_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return PTR_ERR_OR_ZERO(hwmon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static const struct spi_device_id ad7314_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) { "adt7301", adt7301 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) { "adt7302", adt7302 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) { "ad7314", ad7314 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) MODULE_DEVICE_TABLE(spi, ad7314_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static struct spi_driver ad7314_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) .name = "ad7314",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) .probe = ad7314_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) .id_table = ad7314_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) module_spi_driver(ad7314_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) MODULE_DESCRIPTION("Analog Devices AD7314, ADT7301 and ADT7302 digital temperature sensor driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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