492 lines
14 KiB
C
Executable File
492 lines
14 KiB
C
Executable File
/*
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* Copyright (C) ST-Ericsson 2010 - 2013
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* Author: Martin Persson <martin.persson@stericsson.com>
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* Hongbo Zhang <hongbo.zhang@linaro.org>
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* License Terms: GNU General Public License v2
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*
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* ABX500 does not provide auto ADC, so to monitor the required temperatures,
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* a periodic work is used. It is more important to not wake up the CPU than
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* to perform this job, hence the use of a deferred delay.
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*
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* A deferred delay for thermal monitor is considered safe because:
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* If the chip gets too hot during a sleep state it's most likely due to
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* external factors, such as the surrounding temperature. I.e. no SW decisions
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* will make any difference.
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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/hwmon-sysfs.h>
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#include <linux/interrupt.h>
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#include <linux/jiffies.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/sysfs.h>
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#include <linux/workqueue.h>
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#include "abx500.h"
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#define DEFAULT_MONITOR_DELAY HZ
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#define DEFAULT_MAX_TEMP 130
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static inline void schedule_monitor(struct abx500_temp *data)
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{
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data->work_active = true;
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schedule_delayed_work(&data->work, DEFAULT_MONITOR_DELAY);
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}
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static void threshold_updated(struct abx500_temp *data)
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{
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int i;
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for (i = 0; i < data->monitored_sensors; i++)
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if (data->max[i] != 0 || data->min[i] != 0) {
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schedule_monitor(data);
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return;
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}
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dev_dbg(&data->pdev->dev, "No active thresholds.\n");
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cancel_delayed_work_sync(&data->work);
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data->work_active = false;
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}
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static void gpadc_monitor(struct work_struct *work)
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{
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int temp, i, ret;
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char alarm_node[30];
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bool updated_min_alarm, updated_max_alarm;
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struct abx500_temp *data;
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data = container_of(work, struct abx500_temp, work.work);
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mutex_lock(&data->lock);
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for (i = 0; i < data->monitored_sensors; i++) {
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/* Thresholds are considered inactive if set to 0 */
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if (data->max[i] == 0 && data->min[i] == 0)
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continue;
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if (data->max[i] < data->min[i])
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continue;
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ret = data->ops.read_sensor(data, data->gpadc_addr[i], &temp);
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if (ret < 0) {
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dev_err(&data->pdev->dev, "GPADC read failed\n");
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continue;
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}
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updated_min_alarm = false;
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updated_max_alarm = false;
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if (data->min[i] != 0) {
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if (temp < data->min[i]) {
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if (data->min_alarm[i] == false) {
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data->min_alarm[i] = true;
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updated_min_alarm = true;
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}
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} else {
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if (data->min_alarm[i] == true) {
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data->min_alarm[i] = false;
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updated_min_alarm = true;
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}
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}
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}
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if (data->max[i] != 0) {
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if (temp > data->max[i]) {
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if (data->max_alarm[i] == false) {
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data->max_alarm[i] = true;
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updated_max_alarm = true;
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}
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} else if (temp < data->max[i] - data->max_hyst[i]) {
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if (data->max_alarm[i] == true) {
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data->max_alarm[i] = false;
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updated_max_alarm = true;
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}
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}
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}
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if (updated_min_alarm) {
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ret = sprintf(alarm_node, "temp%d_min_alarm", i + 1);
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sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
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}
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if (updated_max_alarm) {
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ret = sprintf(alarm_node, "temp%d_max_alarm", i + 1);
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sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
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}
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}
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schedule_monitor(data);
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mutex_unlock(&data->lock);
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}
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/* HWMON sysfs interfaces */
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static ssize_t show_name(struct device *dev, struct device_attribute *devattr,
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char *buf)
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{
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struct abx500_temp *data = dev_get_drvdata(dev);
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/* Show chip name */
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return data->ops.show_name(dev, devattr, buf);
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}
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static ssize_t show_label(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct abx500_temp *data = dev_get_drvdata(dev);
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/* Show each sensor label */
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return data->ops.show_label(dev, devattr, buf);
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}
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static ssize_t show_input(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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int ret, temp;
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struct abx500_temp *data = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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u8 gpadc_addr = data->gpadc_addr[attr->index];
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ret = data->ops.read_sensor(data, gpadc_addr, &temp);
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if (ret < 0)
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return ret;
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return sprintf(buf, "%d\n", temp);
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}
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/* Set functions (RW nodes) */
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static ssize_t set_min(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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unsigned long val;
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struct abx500_temp *data = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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int res = kstrtol(buf, 10, &val);
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if (res < 0)
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return res;
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val = clamp_val(val, 0, DEFAULT_MAX_TEMP);
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mutex_lock(&data->lock);
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data->min[attr->index] = val;
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threshold_updated(data);
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mutex_unlock(&data->lock);
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return count;
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}
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static ssize_t set_max(struct device *dev, struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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unsigned long val;
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struct abx500_temp *data = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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int res = kstrtol(buf, 10, &val);
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if (res < 0)
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return res;
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val = clamp_val(val, 0, DEFAULT_MAX_TEMP);
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mutex_lock(&data->lock);
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data->max[attr->index] = val;
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threshold_updated(data);
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mutex_unlock(&data->lock);
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return count;
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}
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static ssize_t set_max_hyst(struct device *dev,
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struct device_attribute *devattr,
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const char *buf, size_t count)
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{
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unsigned long val;
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struct abx500_temp *data = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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int res = kstrtoul(buf, 10, &val);
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if (res < 0)
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return res;
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val = clamp_val(val, 0, DEFAULT_MAX_TEMP);
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mutex_lock(&data->lock);
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data->max_hyst[attr->index] = val;
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threshold_updated(data);
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mutex_unlock(&data->lock);
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return count;
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}
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/* Show functions (RO nodes) */
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static ssize_t show_min(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct abx500_temp *data = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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return sprintf(buf, "%ld\n", data->min[attr->index]);
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}
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static ssize_t show_max(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct abx500_temp *data = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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return sprintf(buf, "%ld\n", data->max[attr->index]);
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}
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static ssize_t show_max_hyst(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct abx500_temp *data = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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return sprintf(buf, "%ld\n", data->max_hyst[attr->index]);
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}
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static ssize_t show_min_alarm(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct abx500_temp *data = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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return sprintf(buf, "%d\n", data->min_alarm[attr->index]);
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}
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static ssize_t show_max_alarm(struct device *dev,
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struct device_attribute *devattr, char *buf)
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{
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struct abx500_temp *data = dev_get_drvdata(dev);
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struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
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return sprintf(buf, "%d\n", data->max_alarm[attr->index]);
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}
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static umode_t abx500_attrs_visible(struct kobject *kobj,
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struct attribute *attr, int n)
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{
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struct device *dev = container_of(kobj, struct device, kobj);
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struct abx500_temp *data = dev_get_drvdata(dev);
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if (data->ops.is_visible)
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return data->ops.is_visible(attr, n);
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return attr->mode;
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}
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/* Chip name, required by hwmon */
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static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, 0);
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/* GPADC - SENSOR1 */
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static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_label, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_min, set_min, 0);
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static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_max, set_max, 0);
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static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
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show_max_hyst, set_max_hyst, 0);
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static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_min_alarm, NULL, 0);
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static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_max_alarm, NULL, 0);
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/* GPADC - SENSOR2 */
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static SENSOR_DEVICE_ATTR(temp2_label, S_IRUGO, show_label, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp2_min, S_IWUSR | S_IRUGO, show_min, set_min, 1);
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static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max, 1);
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static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IWUSR | S_IRUGO,
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show_max_hyst, set_max_hyst, 1);
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static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_min_alarm, NULL, 1);
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static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_max_alarm, NULL, 1);
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/* GPADC - SENSOR3 */
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static SENSOR_DEVICE_ATTR(temp3_label, S_IRUGO, show_label, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_input, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp3_min, S_IWUSR | S_IRUGO, show_min, set_min, 2);
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static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max, 2);
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static SENSOR_DEVICE_ATTR(temp3_max_hyst, S_IWUSR | S_IRUGO,
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show_max_hyst, set_max_hyst, 2);
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static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_min_alarm, NULL, 2);
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static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_max_alarm, NULL, 2);
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/* GPADC - SENSOR4 */
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static SENSOR_DEVICE_ATTR(temp4_label, S_IRUGO, show_label, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_input, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp4_min, S_IWUSR | S_IRUGO, show_min, set_min, 3);
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static SENSOR_DEVICE_ATTR(temp4_max, S_IWUSR | S_IRUGO, show_max, set_max, 3);
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static SENSOR_DEVICE_ATTR(temp4_max_hyst, S_IWUSR | S_IRUGO,
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show_max_hyst, set_max_hyst, 3);
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static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_min_alarm, NULL, 3);
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static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_max_alarm, NULL, 3);
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static struct attribute *abx500_temp_attributes[] = {
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&sensor_dev_attr_name.dev_attr.attr,
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&sensor_dev_attr_temp1_label.dev_attr.attr,
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&sensor_dev_attr_temp1_input.dev_attr.attr,
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&sensor_dev_attr_temp1_min.dev_attr.attr,
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&sensor_dev_attr_temp1_max.dev_attr.attr,
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&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_label.dev_attr.attr,
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&sensor_dev_attr_temp2_input.dev_attr.attr,
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&sensor_dev_attr_temp2_min.dev_attr.attr,
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&sensor_dev_attr_temp2_max.dev_attr.attr,
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&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_label.dev_attr.attr,
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&sensor_dev_attr_temp3_input.dev_attr.attr,
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&sensor_dev_attr_temp3_min.dev_attr.attr,
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&sensor_dev_attr_temp3_max.dev_attr.attr,
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&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_label.dev_attr.attr,
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&sensor_dev_attr_temp4_input.dev_attr.attr,
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&sensor_dev_attr_temp4_min.dev_attr.attr,
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&sensor_dev_attr_temp4_max.dev_attr.attr,
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&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
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&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
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&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
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NULL
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};
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static const struct attribute_group abx500_temp_group = {
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.attrs = abx500_temp_attributes,
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.is_visible = abx500_attrs_visible,
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};
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static irqreturn_t abx500_temp_irq_handler(int irq, void *irq_data)
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{
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struct platform_device *pdev = irq_data;
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struct abx500_temp *data = platform_get_drvdata(pdev);
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data->ops.irq_handler(irq, data);
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return IRQ_HANDLED;
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}
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static int setup_irqs(struct platform_device *pdev)
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{
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int ret;
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int irq = platform_get_irq_byname(pdev, "ABX500_TEMP_WARM");
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if (irq < 0) {
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dev_err(&pdev->dev, "Get irq by name failed\n");
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return irq;
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}
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ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
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abx500_temp_irq_handler, IRQF_NO_SUSPEND, "abx500-temp", pdev);
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if (ret < 0)
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dev_err(&pdev->dev, "Request threaded irq failed (%d)\n", ret);
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return ret;
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}
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static int abx500_temp_probe(struct platform_device *pdev)
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{
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struct abx500_temp *data;
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int err;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->pdev = pdev;
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mutex_init(&data->lock);
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/* Chip specific initialization */
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err = abx500_hwmon_init(data);
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if (err < 0 || !data->ops.read_sensor || !data->ops.show_name ||
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!data->ops.show_label)
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return err;
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INIT_DEFERRABLE_WORK(&data->work, gpadc_monitor);
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platform_set_drvdata(pdev, data);
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err = sysfs_create_group(&pdev->dev.kobj, &abx500_temp_group);
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if (err < 0) {
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dev_err(&pdev->dev, "Create sysfs group failed (%d)\n", err);
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return err;
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}
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data->hwmon_dev = hwmon_device_register(&pdev->dev);
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if (IS_ERR(data->hwmon_dev)) {
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err = PTR_ERR(data->hwmon_dev);
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dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
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goto exit_sysfs_group;
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}
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if (data->ops.irq_handler) {
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err = setup_irqs(pdev);
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if (err < 0)
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goto exit_hwmon_reg;
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}
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return 0;
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exit_hwmon_reg:
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hwmon_device_unregister(data->hwmon_dev);
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exit_sysfs_group:
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sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group);
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return err;
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}
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static int abx500_temp_remove(struct platform_device *pdev)
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{
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struct abx500_temp *data = platform_get_drvdata(pdev);
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cancel_delayed_work_sync(&data->work);
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hwmon_device_unregister(data->hwmon_dev);
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sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group);
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return 0;
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}
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static int abx500_temp_suspend(struct platform_device *pdev,
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pm_message_t state)
|
|
{
|
|
struct abx500_temp *data = platform_get_drvdata(pdev);
|
|
|
|
if (data->work_active)
|
|
cancel_delayed_work_sync(&data->work);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int abx500_temp_resume(struct platform_device *pdev)
|
|
{
|
|
struct abx500_temp *data = platform_get_drvdata(pdev);
|
|
|
|
if (data->work_active)
|
|
schedule_monitor(data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id abx500_temp_match[] = {
|
|
{ .compatible = "stericsson,abx500-temp" },
|
|
{},
|
|
};
|
|
#endif
|
|
|
|
static struct platform_driver abx500_temp_driver = {
|
|
.driver = {
|
|
.owner = THIS_MODULE,
|
|
.name = "abx500-temp",
|
|
.of_match_table = of_match_ptr(abx500_temp_match),
|
|
},
|
|
.suspend = abx500_temp_suspend,
|
|
.resume = abx500_temp_resume,
|
|
.probe = abx500_temp_probe,
|
|
.remove = abx500_temp_remove,
|
|
};
|
|
|
|
module_platform_driver(abx500_temp_driver);
|
|
|
|
MODULE_AUTHOR("Martin Persson <martin.persson@stericsson.com>");
|
|
MODULE_DESCRIPTION("ABX500 temperature driver");
|
|
MODULE_LICENSE("GPL");
|