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This is a multi-function device to interface with the sy7636a EPD PMIC chip from Silergy. Signed-off-by: Alistair Francis <alistair@alistair23.me> Acked-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Lee Jones <lee.jones@linaro.org>
107 lines
2.4 KiB
C
107 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Functions to access SY3686A power management chip temperature
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*
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* Copyright (C) 2021 reMarkable AS - http://www.remarkable.com/
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*
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* Authors: Lars Ivar Miljeteig <lars.ivar.miljeteig@remarkable.com>
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* Alistair Francis <alistair@alistair23.me>
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*/
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#include <linux/err.h>
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#include <linux/hwmon.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/regulator/machine.h>
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#include <linux/mfd/sy7636a.h>
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static int sy7636a_read(struct device *dev, enum hwmon_sensor_types type,
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u32 attr, int channel, long *temp)
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{
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struct regmap *regmap = dev_get_drvdata(dev);
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int ret, reg_val;
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ret = regmap_read(regmap,
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SY7636A_REG_TERMISTOR_READOUT, ®_val);
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if (ret)
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return ret;
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*temp = reg_val * 1000;
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return 0;
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}
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static umode_t sy7636a_is_visible(const void *data,
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enum hwmon_sensor_types type,
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u32 attr, int channel)
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{
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if (type != hwmon_temp)
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return 0;
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if (attr != hwmon_temp_input)
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return 0;
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return 0444;
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}
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static const struct hwmon_ops sy7636a_hwmon_ops = {
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.is_visible = sy7636a_is_visible,
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.read = sy7636a_read,
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};
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static const struct hwmon_channel_info *sy7636a_info[] = {
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HWMON_CHANNEL_INFO(chip, HWMON_C_REGISTER_TZ),
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HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT),
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NULL
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};
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static const struct hwmon_chip_info sy7636a_chip_info = {
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.ops = &sy7636a_hwmon_ops,
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.info = sy7636a_info,
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};
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static int sy7636a_sensor_probe(struct platform_device *pdev)
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{
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struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL);
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struct regulator *regulator;
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struct device *hwmon_dev;
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int err;
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if (!regmap)
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return -EPROBE_DEFER;
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regulator = devm_regulator_get(&pdev->dev, "vcom");
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if (IS_ERR(regulator))
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return PTR_ERR(regulator);
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err = regulator_enable(regulator);
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if (err)
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return err;
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hwmon_dev = devm_hwmon_device_register_with_info(&pdev->dev,
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"sy7636a_temperature", regmap,
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&sy7636a_chip_info, NULL);
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if (IS_ERR(hwmon_dev)) {
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err = PTR_ERR(hwmon_dev);
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dev_err(&pdev->dev, "Unable to register hwmon device, returned %d\n", err);
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return err;
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}
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return 0;
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}
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static struct platform_driver sy7636a_sensor_driver = {
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.probe = sy7636a_sensor_probe,
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.driver = {
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.name = "sy7636a-temperature",
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},
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};
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module_platform_driver(sy7636a_sensor_driver);
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MODULE_DESCRIPTION("SY7636A sensor driver");
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MODULE_LICENSE("GPL");
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