+++ /dev/null
-.. SPDX-License-Identifier: GPL-2.0-only
-
-Kernel driver sa67mcu
-=====================
-
-Supported chips:
-
- * Kontron sa67mcu
-
- Prefix: 'sa67mcu'
-
- Datasheet: not available
-
-Authors: Michael Walle <mwalle@kernel.org>
-
-Description
------------
-
-The sa67mcu is a board management controller which also exposes a hardware
-monitoring controller.
-
-The controller has two voltage and one temperature sensor. The values are
-hold in two 8 bit registers to form one 16 bit value. Reading the lower byte
-will also capture the high byte to make the access atomic. The unit of the
-volatge sensors are 1mV and the unit of the temperature sensor is 0.1degC.
-
-Sysfs entries
--------------
-
-The following attributes are supported.
-
-======================= ========================================================
-in0_label "VDDIN"
-in0_input Measured VDDIN voltage.
-
-in1_label "VDD_RTC"
-in1_input Measured VDD_RTC voltage.
-
-temp1_input MCU temperature. Roughly the board temperature.
-======================= ========================================================
-
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * sl67mcu hardware monitoring driver
- *
- * Copyright 2025 Kontron Europe GmbH
- */
-
-#include <linux/bitfield.h>
-#include <linux/hwmon.h>
-#include <linux/kernel.h>
-#include <linux/mod_devicetable.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/property.h>
-#include <linux/regmap.h>
-
-#define SA67MCU_VOLTAGE(n) (0x00 + ((n) * 2))
-#define SA67MCU_TEMP(n) (0x04 + ((n) * 2))
-
-struct sa67mcu_hwmon {
- struct regmap *regmap;
- u32 offset;
-};
-
-static int sa67mcu_hwmon_read(struct device *dev,
- enum hwmon_sensor_types type, u32 attr,
- int channel, long *input)
-{
- struct sa67mcu_hwmon *hwmon = dev_get_drvdata(dev);
- unsigned int offset;
- u8 reg[2];
- int ret;
-
- switch (type) {
- case hwmon_in:
- switch (attr) {
- case hwmon_in_input:
- offset = hwmon->offset + SA67MCU_VOLTAGE(channel);
- break;
- default:
- return -EOPNOTSUPP;
- }
- break;
- case hwmon_temp:
- switch (attr) {
- case hwmon_temp_input:
- offset = hwmon->offset + SA67MCU_TEMP(channel);
- break;
- default:
- return -EOPNOTSUPP;
- }
- break;
- default:
- return -EOPNOTSUPP;
- }
-
- /* Reading the low byte will capture the value */
- ret = regmap_bulk_read(hwmon->regmap, offset, reg, ARRAY_SIZE(reg));
- if (ret)
- return ret;
-
- *input = reg[1] << 8 | reg[0];
-
- /* Temperatures are s16 and in 0.1degC steps. */
- if (type == hwmon_temp)
- *input = sign_extend32(*input, 15) * 100;
-
- return 0;
-}
-
-static const struct hwmon_channel_info * const sa67mcu_hwmon_info[] = {
- HWMON_CHANNEL_INFO(in,
- HWMON_I_INPUT | HWMON_I_LABEL,
- HWMON_I_INPUT | HWMON_I_LABEL),
- HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
- NULL
-};
-
-static const char *const sa67mcu_hwmon_in_labels[] = {
- "VDDIN",
- "VDD_RTC",
-};
-
-static int sa67mcu_hwmon_read_string(struct device *dev,
- enum hwmon_sensor_types type, u32 attr,
- int channel, const char **str)
-{
- switch (type) {
- case hwmon_in:
- switch (attr) {
- case hwmon_in_label:
- *str = sa67mcu_hwmon_in_labels[channel];
- return 0;
- default:
- return -EOPNOTSUPP;
- }
- default:
- return -EOPNOTSUPP;
- }
-}
-
-static const struct hwmon_ops sa67mcu_hwmon_ops = {
- .visible = 0444,
- .read = sa67mcu_hwmon_read,
- .read_string = sa67mcu_hwmon_read_string,
-};
-
-static const struct hwmon_chip_info sa67mcu_hwmon_chip_info = {
- .ops = &sa67mcu_hwmon_ops,
- .info = sa67mcu_hwmon_info,
-};
-
-static int sa67mcu_hwmon_probe(struct platform_device *pdev)
-{
- struct sa67mcu_hwmon *hwmon;
- struct device *hwmon_dev;
- int ret;
-
- if (!pdev->dev.parent)
- return -ENODEV;
-
- hwmon = devm_kzalloc(&pdev->dev, sizeof(*hwmon), GFP_KERNEL);
- if (!hwmon)
- return -ENOMEM;
-
- hwmon->regmap = dev_get_regmap(pdev->dev.parent, NULL);
- if (!hwmon->regmap)
- return -ENODEV;
-
- ret = device_property_read_u32(&pdev->dev, "reg", &hwmon->offset);
- if (ret)
- return -EINVAL;
-
- hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
- "sa67mcu_hwmon", hwmon,
- &sa67mcu_hwmon_chip_info,
- NULL);
- if (IS_ERR(hwmon_dev))
- dev_err(&pdev->dev, "failed to register as hwmon device");
-
- return PTR_ERR_OR_ZERO(hwmon_dev);
-}
-
-static const struct of_device_id sa67mcu_hwmon_of_match[] = {
- { .compatible = "kontron,sa67mcu-hwmon", },
- {}
-};
-MODULE_DEVICE_TABLE(of, sa67mcu_hwmon_of_match);
-
-static struct platform_driver sa67mcu_hwmon_driver = {
- .probe = sa67mcu_hwmon_probe,
- .driver = {
- .name = "sa67mcu-hwmon",
- .of_match_table = sa67mcu_hwmon_of_match,
- },
-};
-module_platform_driver(sa67mcu_hwmon_driver);
-
-MODULE_DESCRIPTION("sa67mcu Hardware Monitoring Driver");
-MODULE_AUTHOR("Michael Walle <mwalle@kernel.org>");
-MODULE_LICENSE("GPL");
projects / ceph-client.git / commitdiff