^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * max31722 - hwmon driver for Maxim Integrated MAX31722/MAX31723 SPI
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * digital thermometer and thermostats.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Copyright (c) 2016, Intel Corporation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/hwmon.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/hwmon-sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/module.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)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define MAX31722_REG_CFG 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define MAX31722_REG_TEMP_LSB 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #define MAX31722_MODE_CONTINUOUS 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define MAX31722_MODE_STANDBY 0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define MAX31722_MODE_MASK 0xFE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define MAX31722_RESOLUTION_12BIT 0x06
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define MAX31722_WRITE_MASK 0x80
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct max31722_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) struct device *hwmon_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct spi_device *spi_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) u8 mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) static int max31722_set_mode(struct max31722_data *data, u8 mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct spi_device *spi = data->spi_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) u8 buf[2] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) MAX31722_REG_CFG | MAX31722_WRITE_MASK,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) (data->mode & MAX31722_MODE_MASK) | mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) ret = spi_write(spi, &buf, sizeof(buf));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) dev_err(&spi->dev, "failed to set sensor mode.\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) data->mode = (data->mode & MAX31722_MODE_MASK) | mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) static ssize_t max31722_temp_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) ssize_t ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) struct max31722_data *data = dev_get_drvdata(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ret = spi_w8r16(data->spi_device, MAX31722_REG_TEMP_LSB);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) /* Keep 12 bits and multiply by the scale of 62.5 millidegrees/bit. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) return sprintf(buf, "%d\n", (s16)le16_to_cpu(ret) * 125 / 32);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) static SENSOR_DEVICE_ATTR_RO(temp1_input, max31722_temp, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static struct attribute *max31722_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) &sensor_dev_attr_temp1_input.dev_attr.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) ATTRIBUTE_GROUPS(max31722);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) static int max31722_probe(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct max31722_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) if (!data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) spi_set_drvdata(spi, data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) data->spi_device = spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * Set SD bit to 0 so we can have continuous measurements.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * Set resolution to 12 bits for maximum precision.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) data->mode = MAX31722_MODE_CONTINUOUS | MAX31722_RESOLUTION_12BIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) ret = max31722_set_mode(data, MAX31722_MODE_CONTINUOUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) data->hwmon_dev = hwmon_device_register_with_groups(&spi->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) spi->modalias,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) max31722_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (IS_ERR(data->hwmon_dev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) max31722_set_mode(data, MAX31722_MODE_STANDBY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return PTR_ERR(data->hwmon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static int max31722_remove(struct spi_device *spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) struct max31722_data *data = spi_get_drvdata(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) hwmon_device_unregister(data->hwmon_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return max31722_set_mode(data, MAX31722_MODE_STANDBY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) static int __maybe_unused max31722_suspend(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) struct spi_device *spi_device = to_spi_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) struct max31722_data *data = spi_get_drvdata(spi_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return max31722_set_mode(data, MAX31722_MODE_STANDBY);
^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) static int __maybe_unused max31722_resume(struct device *dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct spi_device *spi_device = to_spi_device(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct max31722_data *data = spi_get_drvdata(spi_device);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) return max31722_set_mode(data, MAX31722_MODE_CONTINUOUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) static SIMPLE_DEV_PM_OPS(max31722_pm_ops, max31722_suspend, max31722_resume);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) static const struct spi_device_id max31722_spi_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) {"max31722", 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {"max31723", 0},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) MODULE_DEVICE_TABLE(spi, max31722_spi_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static struct spi_driver max31722_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) .name = "max31722",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) .pm = &max31722_pm_ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) .probe = max31722_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) .remove = max31722_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) .id_table = max31722_spi_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) module_spi_driver(max31722_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) MODULE_DESCRIPTION("max31722 sensor driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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