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97387c2f06
Valid Maxim Integrated ACPI device IDs would start with MXIM,
not with MAX1. On top of that, ACPI device IDs reflecting chip names
are almost always invalid.
Remove the invalid ACPI IDs.
Fixes: 04e1e70afe ("hwmon: (max31722) Add support for MAX31722/MAX31723 temperature sensors")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* max31722 - hwmon driver for Maxim Integrated MAX31722/MAX31723 SPI
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* digital thermometer and thermostats.
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*
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* Copyright (c) 2016, Intel Corporation.
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*/
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#include <linux/hwmon.h>
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#include <linux/hwmon-sysfs.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#define MAX31722_REG_CFG 0x00
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#define MAX31722_REG_TEMP_LSB 0x01
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#define MAX31722_MODE_CONTINUOUS 0x00
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#define MAX31722_MODE_STANDBY 0x01
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#define MAX31722_MODE_MASK 0xFE
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#define MAX31722_RESOLUTION_12BIT 0x06
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#define MAX31722_WRITE_MASK 0x80
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struct max31722_data {
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struct device *hwmon_dev;
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struct spi_device *spi_device;
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u8 mode;
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};
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static int max31722_set_mode(struct max31722_data *data, u8 mode)
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{
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int ret;
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struct spi_device *spi = data->spi_device;
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u8 buf[2] = {
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MAX31722_REG_CFG | MAX31722_WRITE_MASK,
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(data->mode & MAX31722_MODE_MASK) | mode
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};
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ret = spi_write(spi, &buf, sizeof(buf));
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if (ret < 0) {
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dev_err(&spi->dev, "failed to set sensor mode.\n");
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return ret;
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}
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data->mode = (data->mode & MAX31722_MODE_MASK) | mode;
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return 0;
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}
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static ssize_t max31722_temp_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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ssize_t ret;
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struct max31722_data *data = dev_get_drvdata(dev);
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ret = spi_w8r16(data->spi_device, MAX31722_REG_TEMP_LSB);
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if (ret < 0)
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return ret;
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/* Keep 12 bits and multiply by the scale of 62.5 millidegrees/bit. */
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return sprintf(buf, "%d\n", (s16)le16_to_cpu(ret) * 125 / 32);
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}
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static SENSOR_DEVICE_ATTR_RO(temp1_input, max31722_temp, 0);
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static struct attribute *max31722_attrs[] = {
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(max31722);
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static int max31722_probe(struct spi_device *spi)
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{
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int ret;
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struct max31722_data *data;
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data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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spi_set_drvdata(spi, data);
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data->spi_device = spi;
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/*
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* Set SD bit to 0 so we can have continuous measurements.
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* Set resolution to 12 bits for maximum precision.
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*/
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data->mode = MAX31722_MODE_CONTINUOUS | MAX31722_RESOLUTION_12BIT;
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ret = max31722_set_mode(data, MAX31722_MODE_CONTINUOUS);
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if (ret < 0)
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return ret;
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data->hwmon_dev = hwmon_device_register_with_groups(&spi->dev,
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spi->modalias,
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data,
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max31722_groups);
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if (IS_ERR(data->hwmon_dev)) {
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max31722_set_mode(data, MAX31722_MODE_STANDBY);
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return PTR_ERR(data->hwmon_dev);
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}
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return 0;
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}
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static int max31722_remove(struct spi_device *spi)
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{
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struct max31722_data *data = spi_get_drvdata(spi);
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hwmon_device_unregister(data->hwmon_dev);
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return max31722_set_mode(data, MAX31722_MODE_STANDBY);
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}
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static int __maybe_unused max31722_suspend(struct device *dev)
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{
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struct spi_device *spi_device = to_spi_device(dev);
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struct max31722_data *data = spi_get_drvdata(spi_device);
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return max31722_set_mode(data, MAX31722_MODE_STANDBY);
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}
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static int __maybe_unused max31722_resume(struct device *dev)
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{
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struct spi_device *spi_device = to_spi_device(dev);
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struct max31722_data *data = spi_get_drvdata(spi_device);
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return max31722_set_mode(data, MAX31722_MODE_CONTINUOUS);
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}
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static SIMPLE_DEV_PM_OPS(max31722_pm_ops, max31722_suspend, max31722_resume);
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static const struct spi_device_id max31722_spi_id[] = {
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{"max31722", 0},
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{"max31723", 0},
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{}
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};
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MODULE_DEVICE_TABLE(spi, max31722_spi_id);
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static struct spi_driver max31722_driver = {
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.driver = {
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.name = "max31722",
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.pm = &max31722_pm_ops,
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},
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.probe = max31722_probe,
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.remove = max31722_remove,
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.id_table = max31722_spi_id,
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};
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module_spi_driver(max31722_driver);
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MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
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MODULE_DESCRIPTION("max31722 sensor driver");
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MODULE_LICENSE("GPL v2");
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