316 lines
6.9 KiB
C
316 lines
6.9 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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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 platform_device *pdev = to_platform_device(dev);
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struct st_thermal_sensor *sensor = platform_get_drvdata(pdev);
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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 platform_device *pdev = to_platform_device(dev);
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struct st_thermal_sensor *sensor = platform_get_drvdata(pdev);
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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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