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106 lines
2.4 KiB
106 lines
2.4 KiB
// 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 <[email protected]> |
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* Alistair Francis <[email protected]> |
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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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