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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
309 lines
6.6 KiB
C
309 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* ST Thermal Sensor Driver core routines
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* Author: Ajit Pal Singh <ajitpal.singh@st.com>
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*
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* Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
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*/
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#include <linux/clk.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include "st_thermal.h"
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/* The Thermal Framework expects millidegrees */
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#define mcelsius(temp) ((temp) * 1000)
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/*
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* Function to allocate regfields which are common
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* between syscfg and memory mapped based sensors
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*/
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static int st_thermal_alloc_regfields(struct st_thermal_sensor *sensor)
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{
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struct device *dev = sensor->dev;
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struct regmap *regmap = sensor->regmap;
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const struct reg_field *reg_fields = sensor->cdata->reg_fields;
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sensor->dcorrect = devm_regmap_field_alloc(dev, regmap,
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reg_fields[DCORRECT]);
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sensor->overflow = devm_regmap_field_alloc(dev, regmap,
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reg_fields[OVERFLOW]);
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sensor->temp_data = devm_regmap_field_alloc(dev, regmap,
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reg_fields[DATA]);
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if (IS_ERR(sensor->dcorrect) ||
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IS_ERR(sensor->overflow) ||
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IS_ERR(sensor->temp_data)) {
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dev_err(dev, "failed to allocate common regfields\n");
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return -EINVAL;
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}
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return sensor->ops->alloc_regfields(sensor);
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}
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static int st_thermal_sensor_on(struct st_thermal_sensor *sensor)
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{
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int ret;
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struct device *dev = sensor->dev;
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ret = clk_prepare_enable(sensor->clk);
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if (ret) {
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dev_err(dev, "failed to enable clk\n");
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return ret;
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}
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ret = sensor->ops->power_ctrl(sensor, POWER_ON);
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if (ret) {
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dev_err(dev, "failed to power on sensor\n");
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clk_disable_unprepare(sensor->clk);
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}
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return ret;
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}
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static int st_thermal_sensor_off(struct st_thermal_sensor *sensor)
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{
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int ret;
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ret = sensor->ops->power_ctrl(sensor, POWER_OFF);
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if (ret)
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return ret;
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clk_disable_unprepare(sensor->clk);
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return 0;
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}
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static int st_thermal_calibration(struct st_thermal_sensor *sensor)
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{
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int ret;
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unsigned int val;
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struct device *dev = sensor->dev;
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/* Check if sensor calibration data is already written */
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ret = regmap_field_read(sensor->dcorrect, &val);
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if (ret) {
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dev_err(dev, "failed to read calibration data\n");
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return ret;
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}
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if (!val) {
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/*
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* Sensor calibration value not set by bootloader,
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* default calibration data to be used
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*/
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ret = regmap_field_write(sensor->dcorrect,
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sensor->cdata->calibration_val);
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if (ret)
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dev_err(dev, "failed to set calibration data\n");
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}
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return ret;
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}
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/* Callback to get temperature from HW*/
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static int st_thermal_get_temp(struct thermal_zone_device *th, int *temperature)
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{
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struct st_thermal_sensor *sensor = th->devdata;
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struct device *dev = sensor->dev;
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unsigned int temp;
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unsigned int overflow;
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int ret;
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ret = regmap_field_read(sensor->overflow, &overflow);
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if (ret)
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return ret;
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if (overflow)
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return -EIO;
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ret = regmap_field_read(sensor->temp_data, &temp);
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if (ret)
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return ret;
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temp += sensor->cdata->temp_adjust_val;
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temp = mcelsius(temp);
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dev_dbg(dev, "temperature: %d\n", temp);
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*temperature = temp;
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return 0;
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}
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static int st_thermal_get_trip_type(struct thermal_zone_device *th,
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int trip, enum thermal_trip_type *type)
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{
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struct st_thermal_sensor *sensor = th->devdata;
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struct device *dev = sensor->dev;
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switch (trip) {
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case 0:
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*type = THERMAL_TRIP_CRITICAL;
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break;
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default:
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dev_err(dev, "invalid trip point\n");
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return -EINVAL;
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}
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return 0;
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}
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static int st_thermal_get_trip_temp(struct thermal_zone_device *th,
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int trip, int *temp)
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{
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struct st_thermal_sensor *sensor = th->devdata;
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struct device *dev = sensor->dev;
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switch (trip) {
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case 0:
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*temp = mcelsius(sensor->cdata->crit_temp);
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break;
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default:
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dev_err(dev, "Invalid trip point\n");
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return -EINVAL;
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}
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return 0;
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}
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static struct thermal_zone_device_ops st_tz_ops = {
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.get_temp = st_thermal_get_temp,
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.get_trip_type = st_thermal_get_trip_type,
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.get_trip_temp = st_thermal_get_trip_temp,
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};
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int st_thermal_register(struct platform_device *pdev,
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const struct of_device_id *st_thermal_of_match)
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{
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struct st_thermal_sensor *sensor;
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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const struct of_device_id *match;
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int polling_delay;
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int ret;
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if (!np) {
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dev_err(dev, "device tree node not found\n");
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return -EINVAL;
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}
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sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL);
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if (!sensor)
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return -ENOMEM;
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sensor->dev = dev;
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match = of_match_device(st_thermal_of_match, dev);
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if (!(match && match->data))
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return -EINVAL;
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sensor->cdata = match->data;
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if (!sensor->cdata->ops)
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return -EINVAL;
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sensor->ops = sensor->cdata->ops;
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ret = (sensor->ops->regmap_init)(sensor);
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if (ret)
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return ret;
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ret = st_thermal_alloc_regfields(sensor);
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if (ret)
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return ret;
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sensor->clk = devm_clk_get(dev, "thermal");
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if (IS_ERR(sensor->clk)) {
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dev_err(dev, "failed to fetch clock\n");
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return PTR_ERR(sensor->clk);
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}
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if (sensor->ops->register_enable_irq) {
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ret = sensor->ops->register_enable_irq(sensor);
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if (ret)
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return ret;
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}
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ret = st_thermal_sensor_on(sensor);
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if (ret)
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return ret;
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ret = st_thermal_calibration(sensor);
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if (ret)
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goto sensor_off;
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polling_delay = sensor->ops->register_enable_irq ? 0 : 1000;
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sensor->thermal_dev =
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thermal_zone_device_register(dev_name(dev), 1, 0, sensor,
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&st_tz_ops, NULL, 0, polling_delay);
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if (IS_ERR(sensor->thermal_dev)) {
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dev_err(dev, "failed to register thermal zone device\n");
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ret = PTR_ERR(sensor->thermal_dev);
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goto sensor_off;
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}
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platform_set_drvdata(pdev, sensor);
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return 0;
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sensor_off:
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st_thermal_sensor_off(sensor);
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return ret;
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}
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EXPORT_SYMBOL_GPL(st_thermal_register);
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int st_thermal_unregister(struct platform_device *pdev)
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{
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struct st_thermal_sensor *sensor = platform_get_drvdata(pdev);
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st_thermal_sensor_off(sensor);
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thermal_zone_device_unregister(sensor->thermal_dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(st_thermal_unregister);
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#ifdef CONFIG_PM_SLEEP
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static int st_thermal_suspend(struct device *dev)
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{
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struct st_thermal_sensor *sensor = dev_get_drvdata(dev);
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return st_thermal_sensor_off(sensor);
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}
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static int st_thermal_resume(struct device *dev)
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{
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int ret;
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struct st_thermal_sensor *sensor = dev_get_drvdata(dev);
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ret = st_thermal_sensor_on(sensor);
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if (ret)
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return ret;
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ret = st_thermal_calibration(sensor);
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if (ret)
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return ret;
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if (sensor->ops->enable_irq) {
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ret = sensor->ops->enable_irq(sensor);
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if (ret)
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return ret;
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}
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return 0;
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}
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#endif
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SIMPLE_DEV_PM_OPS(st_thermal_pm_ops, st_thermal_suspend, st_thermal_resume);
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EXPORT_SYMBOL_GPL(st_thermal_pm_ops);
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MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
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MODULE_LICENSE("GPL v2");
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