316 lines
8.3 KiB
C
316 lines
8.3 KiB
C
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/*
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* Thermal device driver for DA9062 and DA9061
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* Copyright (C) 2017 Dialog Semiconductor
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/* When over-temperature is reached, an interrupt from the device will be
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* triggered. Following this event the interrupt will be disabled and
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* periodic transmission of uevents (HOT trip point) should define the
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* first level of temperature supervision. It is expected that any final
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* implementation of the thermal driver will include a .notify() function
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* to implement these uevents to userspace.
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*
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* These uevents are intended to indicate non-invasive temperature control
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* of the system, where the necessary measures for cooling are the
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* responsibility of the host software. Once the temperature falls again,
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* the IRQ is re-enabled so the start of a new over-temperature event can
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* be detected without constant software monitoring.
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*/
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/thermal.h>
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#include <linux/workqueue.h>
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#include <linux/mfd/da9062/core.h>
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#include <linux/mfd/da9062/registers.h>
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/* Minimum, maximum and default polling millisecond periods are provided
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* here as an example. It is expected that any final implementation to also
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* include a modification of these settings to match the required
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* application.
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*/
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#define DA9062_DEFAULT_POLLING_MS_PERIOD 3000
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#define DA9062_MAX_POLLING_MS_PERIOD 10000
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#define DA9062_MIN_POLLING_MS_PERIOD 1000
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#define DA9062_MILLI_CELSIUS(t) ((t) * 1000)
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struct da9062_thermal_config {
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const char *name;
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};
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struct da9062_thermal {
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struct da9062 *hw;
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struct delayed_work work;
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struct thermal_zone_device *zone;
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enum thermal_device_mode mode;
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struct mutex lock; /* protection for da9062_thermal temperature */
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int temperature;
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int irq;
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const struct da9062_thermal_config *config;
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struct device *dev;
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};
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static void da9062_thermal_poll_on(struct work_struct *work)
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{
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struct da9062_thermal *thermal = container_of(work,
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struct da9062_thermal,
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work.work);
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unsigned long delay;
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unsigned int val;
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int ret;
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/* clear E_TEMP */
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ret = regmap_write(thermal->hw->regmap,
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DA9062AA_EVENT_B,
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DA9062AA_E_TEMP_MASK);
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if (ret < 0) {
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dev_err(thermal->dev,
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"Cannot clear the TJUNC temperature status\n");
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goto err_enable_irq;
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}
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/* Now read E_TEMP again: it is acting like a status bit.
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* If over-temperature, then this status will be true.
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* If not over-temperature, this status will be false.
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*/
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ret = regmap_read(thermal->hw->regmap,
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DA9062AA_EVENT_B,
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&val);
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if (ret < 0) {
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dev_err(thermal->dev,
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"Cannot check the TJUNC temperature status\n");
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goto err_enable_irq;
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}
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if (val & DA9062AA_E_TEMP_MASK) {
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mutex_lock(&thermal->lock);
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thermal->temperature = DA9062_MILLI_CELSIUS(125);
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mutex_unlock(&thermal->lock);
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thermal_zone_device_update(thermal->zone,
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THERMAL_EVENT_UNSPECIFIED);
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delay = msecs_to_jiffies(thermal->zone->passive_delay);
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queue_delayed_work(system_freezable_wq, &thermal->work, delay);
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return;
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}
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mutex_lock(&thermal->lock);
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thermal->temperature = DA9062_MILLI_CELSIUS(0);
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mutex_unlock(&thermal->lock);
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thermal_zone_device_update(thermal->zone,
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THERMAL_EVENT_UNSPECIFIED);
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err_enable_irq:
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enable_irq(thermal->irq);
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}
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static irqreturn_t da9062_thermal_irq_handler(int irq, void *data)
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{
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struct da9062_thermal *thermal = data;
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disable_irq_nosync(thermal->irq);
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queue_delayed_work(system_freezable_wq, &thermal->work, 0);
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return IRQ_HANDLED;
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}
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static int da9062_thermal_get_mode(struct thermal_zone_device *z,
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enum thermal_device_mode *mode)
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{
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struct da9062_thermal *thermal = z->devdata;
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*mode = thermal->mode;
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return 0;
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}
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static int da9062_thermal_get_trip_type(struct thermal_zone_device *z,
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int trip,
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enum thermal_trip_type *type)
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{
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struct da9062_thermal *thermal = z->devdata;
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switch (trip) {
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case 0:
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*type = THERMAL_TRIP_HOT;
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break;
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default:
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dev_err(thermal->dev,
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"Driver does not support more than 1 trip-wire\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 da9062_thermal_get_trip_temp(struct thermal_zone_device *z,
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int trip,
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int *temp)
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{
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struct da9062_thermal *thermal = z->devdata;
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switch (trip) {
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case 0:
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*temp = DA9062_MILLI_CELSIUS(125);
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break;
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default:
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dev_err(thermal->dev,
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"Driver does not support more than 1 trip-wire\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 da9062_thermal_get_temp(struct thermal_zone_device *z,
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int *temp)
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{
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struct da9062_thermal *thermal = z->devdata;
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mutex_lock(&thermal->lock);
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*temp = thermal->temperature;
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mutex_unlock(&thermal->lock);
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return 0;
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}
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static struct thermal_zone_device_ops da9062_thermal_ops = {
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.get_temp = da9062_thermal_get_temp,
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.get_mode = da9062_thermal_get_mode,
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.get_trip_type = da9062_thermal_get_trip_type,
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.get_trip_temp = da9062_thermal_get_trip_temp,
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};
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static const struct da9062_thermal_config da9062_config = {
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.name = "da9062-thermal",
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};
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static const struct of_device_id da9062_compatible_reg_id_table[] = {
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{ .compatible = "dlg,da9062-thermal", .data = &da9062_config },
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{ },
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};
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MODULE_DEVICE_TABLE(of, da9062_compatible_reg_id_table);
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static int da9062_thermal_probe(struct platform_device *pdev)
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{
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struct da9062 *chip = dev_get_drvdata(pdev->dev.parent);
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struct da9062_thermal *thermal;
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unsigned int pp_tmp = DA9062_DEFAULT_POLLING_MS_PERIOD;
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const struct of_device_id *match;
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int ret = 0;
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match = of_match_node(da9062_compatible_reg_id_table,
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pdev->dev.of_node);
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if (!match)
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return -ENXIO;
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if (pdev->dev.of_node) {
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if (!of_property_read_u32(pdev->dev.of_node,
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"polling-delay-passive",
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&pp_tmp)) {
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if (pp_tmp < DA9062_MIN_POLLING_MS_PERIOD ||
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pp_tmp > DA9062_MAX_POLLING_MS_PERIOD) {
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dev_warn(&pdev->dev,
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"Out-of-range polling period %d ms\n",
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pp_tmp);
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pp_tmp = DA9062_DEFAULT_POLLING_MS_PERIOD;
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}
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}
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}
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thermal = devm_kzalloc(&pdev->dev, sizeof(struct da9062_thermal),
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GFP_KERNEL);
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if (!thermal) {
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ret = -ENOMEM;
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goto err;
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}
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thermal->config = match->data;
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thermal->hw = chip;
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thermal->mode = THERMAL_DEVICE_ENABLED;
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thermal->dev = &pdev->dev;
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INIT_DELAYED_WORK(&thermal->work, da9062_thermal_poll_on);
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mutex_init(&thermal->lock);
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thermal->zone = thermal_zone_device_register(thermal->config->name,
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1, 0, thermal,
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&da9062_thermal_ops, NULL, pp_tmp,
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0);
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if (IS_ERR(thermal->zone)) {
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dev_err(&pdev->dev, "Cannot register thermal zone device\n");
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ret = PTR_ERR(thermal->zone);
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goto err;
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}
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dev_dbg(&pdev->dev,
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"TJUNC temperature polling period set at %d ms\n",
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thermal->zone->passive_delay);
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ret = platform_get_irq_byname(pdev, "THERMAL");
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if (ret < 0) {
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dev_err(&pdev->dev, "Failed to get platform IRQ.\n");
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goto err_zone;
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}
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thermal->irq = ret;
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ret = request_threaded_irq(thermal->irq, NULL,
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da9062_thermal_irq_handler,
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IRQF_TRIGGER_LOW | IRQF_ONESHOT,
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"THERMAL", thermal);
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if (ret) {
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dev_err(&pdev->dev,
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"Failed to request thermal device IRQ.\n");
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goto err_zone;
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}
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platform_set_drvdata(pdev, thermal);
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return 0;
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err_zone:
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thermal_zone_device_unregister(thermal->zone);
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err:
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return ret;
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}
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static int da9062_thermal_remove(struct platform_device *pdev)
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{
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struct da9062_thermal *thermal = platform_get_drvdata(pdev);
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free_irq(thermal->irq, thermal);
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cancel_delayed_work_sync(&thermal->work);
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thermal_zone_device_unregister(thermal->zone);
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return 0;
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}
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static struct platform_driver da9062_thermal_driver = {
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.probe = da9062_thermal_probe,
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.remove = da9062_thermal_remove,
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.driver = {
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.name = "da9062-thermal",
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.of_match_table = da9062_compatible_reg_id_table,
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},
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};
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module_platform_driver(da9062_thermal_driver);
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MODULE_AUTHOR("Steve Twiss");
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MODULE_DESCRIPTION("Thermal TJUNC device driver for Dialog DA9062 and DA9061");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9062-thermal");
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