drivers/hwmon/abx500.c - kernel/common - Git at Google

 /*
  * Copyright (C) ST-Ericsson 2010 - 2013
  * Author: Martin Persson <[email protected]>
  *         Hongbo Zhang <[email protected]>
  * License Terms: GNU General Public License v2
  *
  * ABX500 does not provide auto ADC, so to monitor the required temperatures,
  * a periodic work is used. It is more important to not wake up the CPU than
  * to perform this job, hence the use of a deferred delay.
  *
  * A deferred delay for thermal monitor is considered safe because:
  * If the chip gets too hot during a sleep state it's most likely due to
  * external factors, such as the surrounding temperature. I.e. no SW decisions
  * will make any difference.
  */

 #include <linux/err.h>
 #include <linux/hwmon.h>
 #include <linux/hwmon-sysfs.h>
 #include <linux/interrupt.h>
 #include <linux/jiffies.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/pm.h>
 #include <linux/slab.h>
 #include <linux/sysfs.h>
 #include <linux/workqueue.h>
 #include "abx500.h"

 #define DEFAULT_MONITOR_DELAY	HZ
 #define DEFAULT_MAX_TEMP	130

 static inline void schedule_monitor(struct abx500_temp *data)
 {
 	data->work_active = true;
 	schedule_delayed_work(&data->work, DEFAULT_MONITOR_DELAY);
 }

 static void threshold_updated(struct abx500_temp *data)
 {
 	int i;
 	for (i = 0; i < data->monitored_sensors; i++)
 		if (data->max[i] != 0 || data->min[i] != 0) {
 			schedule_monitor(data);
 			return;
 		}

 	dev_dbg(&data->pdev->dev, "No active thresholds.\n");
 	cancel_delayed_work_sync(&data->work);
 	data->work_active = false;
 }

 static void gpadc_monitor(struct work_struct *work)
 {
 	int temp, i, ret;
 	char alarm_node[30];
 	bool updated_min_alarm, updated_max_alarm;
 	struct abx500_temp *data;

 	data = container_of(work, struct abx500_temp, work.work);
 	mutex_lock(&data->lock);

 	for (i = 0; i < data->monitored_sensors; i++) {
 		/* Thresholds are considered inactive if set to 0 */
 		if (data->max[i] == 0 && data->min[i] == 0)
 			continue;

 		if (data->max[i] < data->min[i])
 			continue;

 		ret = data->ops.read_sensor(data, data->gpadc_addr[i], &temp);
 		if (ret < 0) {
 			dev_err(&data->pdev->dev, "GPADC read failed\n");
 			continue;
 		}

 		updated_min_alarm = false;
 		updated_max_alarm = false;

 		if (data->min[i] != 0) {
 			if (temp < data->min[i]) {
 				if (data->min_alarm[i] == false) {
 					data->min_alarm[i] = true;
 					updated_min_alarm = true;
 				}
 			} else {
 				if (data->min_alarm[i] == true) {
 					data->min_alarm[i] = false;
 					updated_min_alarm = true;
 				}
 			}
 		}
 		if (data->max[i] != 0) {
 			if (temp > data->max[i]) {
 				if (data->max_alarm[i] == false) {
 					data->max_alarm[i] = true;
 					updated_max_alarm = true;
 				}
 			} else if (temp < data->max[i] - data->max_hyst[i]) {
 				if (data->max_alarm[i] == true) {
 					data->max_alarm[i] = false;
 					updated_max_alarm = true;
 				}
 			}
 		}

 		if (updated_min_alarm) {
 			ret = sprintf(alarm_node, "temp%d_min_alarm", i + 1);
 			sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
 		}
 		if (updated_max_alarm) {
 			ret = sprintf(alarm_node, "temp%d_max_alarm", i + 1);
 			sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
 		}
 	}

 	schedule_monitor(data);
 	mutex_unlock(&data->lock);
 }

 /* HWMON sysfs interfaces */
 static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
 			 char *buf)
 {
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	/* Show chip name */
 	return data->ops.show_name(dev, devattr, buf);
 }

 static ssize_t label_show(struct device *dev,
 			  struct device_attribute *devattr, char *buf)
 {
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	/* Show each sensor label */
 	return data->ops.show_label(dev, devattr, buf);
 }

 static ssize_t input_show(struct device *dev,
 			  struct device_attribute *devattr, char *buf)
 {
 	int ret, temp;
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	u8 gpadc_addr = data->gpadc_addr[attr->index];

 	ret = data->ops.read_sensor(data, gpadc_addr, &temp);
 	if (ret < 0)
 		return ret;

 	return sprintf(buf, "%d\n", temp);
 }

 /* Set functions (RW nodes) */
 static ssize_t min_store(struct device *dev, struct device_attribute *devattr,
 			 const char *buf, size_t count)
 {
 	unsigned long val;
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	int res = kstrtol(buf, 10, &val);
 	if (res < 0)
 		return res;

 	val = clamp_val(val, 0, DEFAULT_MAX_TEMP);

 	mutex_lock(&data->lock);
 	data->min[attr->index] = val;
 	threshold_updated(data);
 	mutex_unlock(&data->lock);

 	return count;
 }

 static ssize_t max_store(struct device *dev, struct device_attribute *devattr,
 			 const char *buf, size_t count)
 {
 	unsigned long val;
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	int res = kstrtol(buf, 10, &val);
 	if (res < 0)
 		return res;

 	val = clamp_val(val, 0, DEFAULT_MAX_TEMP);

 	mutex_lock(&data->lock);
 	data->max[attr->index] = val;
 	threshold_updated(data);
 	mutex_unlock(&data->lock);

 	return count;
 }

 static ssize_t max_hyst_store(struct device *dev,
 			      struct device_attribute *devattr,
 			      const char *buf, size_t count)
 {
 	unsigned long val;
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 	int res = kstrtoul(buf, 10, &val);
 	if (res < 0)
 		return res;

 	val = clamp_val(val, 0, DEFAULT_MAX_TEMP);

 	mutex_lock(&data->lock);
 	data->max_hyst[attr->index] = val;
 	threshold_updated(data);
 	mutex_unlock(&data->lock);

 	return count;
 }

 /* Show functions (RO nodes) */
 static ssize_t min_show(struct device *dev, struct device_attribute *devattr,
 			char *buf)
 {
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

 	return sprintf(buf, "%lu\n", data->min[attr->index]);
 }

 static ssize_t max_show(struct device *dev, struct device_attribute *devattr,
 			char *buf)
 {
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

 	return sprintf(buf, "%lu\n", data->max[attr->index]);
 }

 static ssize_t max_hyst_show(struct device *dev,
 			     struct device_attribute *devattr, char *buf)
 {
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

 	return sprintf(buf, "%lu\n", data->max_hyst[attr->index]);
 }

 static ssize_t min_alarm_show(struct device *dev,
 			      struct device_attribute *devattr, char *buf)
 {
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

 	return sprintf(buf, "%d\n", data->min_alarm[attr->index]);
 }

 static ssize_t max_alarm_show(struct device *dev,
 			      struct device_attribute *devattr, char *buf)
 {
 	struct abx500_temp *data = dev_get_drvdata(dev);
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

 	return sprintf(buf, "%d\n", data->max_alarm[attr->index]);
 }

 static umode_t abx500_attrs_visible(struct kobject *kobj,
 				   struct attribute *attr, int n)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
 	struct abx500_temp *data = dev_get_drvdata(dev);

 	if (data->ops.is_visible)
 		return data->ops.is_visible(attr, n);

 	return attr->mode;
 }

 /* Chip name, required by hwmon */
 static SENSOR_DEVICE_ATTR_RO(name, name, 0);

 /* GPADC - SENSOR1 */
 static SENSOR_DEVICE_ATTR_RO(temp1_label, label, 0);
 static SENSOR_DEVICE_ATTR_RO(temp1_input, input, 0);
 static SENSOR_DEVICE_ATTR_RW(temp1_min, min, 0);
 static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0);
 static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, max_hyst, 0);
 static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, min_alarm, 0);
 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, max_alarm, 0);

 /* GPADC - SENSOR2 */
 static SENSOR_DEVICE_ATTR_RO(temp2_label, label, 1);
 static SENSOR_DEVICE_ATTR_RO(temp2_input, input, 1);
 static SENSOR_DEVICE_ATTR_RW(temp2_min, min, 1);
 static SENSOR_DEVICE_ATTR_RW(temp2_max, max, 1);
 static SENSOR_DEVICE_ATTR_RW(temp2_max_hyst, max_hyst, 1);
 static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, min_alarm, 1);
 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, max_alarm, 1);

 /* GPADC - SENSOR3 */
 static SENSOR_DEVICE_ATTR_RO(temp3_label, label, 2);
 static SENSOR_DEVICE_ATTR_RO(temp3_input, input, 2);
 static SENSOR_DEVICE_ATTR_RW(temp3_min, min, 2);
 static SENSOR_DEVICE_ATTR_RW(temp3_max, max, 2);
 static SENSOR_DEVICE_ATTR_RW(temp3_max_hyst, max_hyst, 2);
 static SENSOR_DEVICE_ATTR_RO(temp3_min_alarm, min_alarm, 2);
 static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, max_alarm, 2);

 /* GPADC - SENSOR4 */
 static SENSOR_DEVICE_ATTR_RO(temp4_label, label, 3);
 static SENSOR_DEVICE_ATTR_RO(temp4_input, input, 3);
 static SENSOR_DEVICE_ATTR_RW(temp4_min, min, 3);
 static SENSOR_DEVICE_ATTR_RW(temp4_max, max, 3);
 static SENSOR_DEVICE_ATTR_RW(temp4_max_hyst, max_hyst, 3);
 static SENSOR_DEVICE_ATTR_RO(temp4_min_alarm, min_alarm, 3);
 static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, max_alarm, 3);

 static struct attribute *abx500_temp_attributes[] = {
 	&sensor_dev_attr_name.dev_attr.attr,

 	&sensor_dev_attr_temp1_label.dev_attr.attr,
 	&sensor_dev_attr_temp1_input.dev_attr.attr,
 	&sensor_dev_attr_temp1_min.dev_attr.attr,
 	&sensor_dev_attr_temp1_max.dev_attr.attr,
 	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,

 	&sensor_dev_attr_temp2_label.dev_attr.attr,
 	&sensor_dev_attr_temp2_input.dev_attr.attr,
 	&sensor_dev_attr_temp2_min.dev_attr.attr,
 	&sensor_dev_attr_temp2_max.dev_attr.attr,
 	&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,

 	&sensor_dev_attr_temp3_label.dev_attr.attr,
 	&sensor_dev_attr_temp3_input.dev_attr.attr,
 	&sensor_dev_attr_temp3_min.dev_attr.attr,
 	&sensor_dev_attr_temp3_max.dev_attr.attr,
 	&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,

 	&sensor_dev_attr_temp4_label.dev_attr.attr,
 	&sensor_dev_attr_temp4_input.dev_attr.attr,
 	&sensor_dev_attr_temp4_min.dev_attr.attr,
 	&sensor_dev_attr_temp4_max.dev_attr.attr,
 	&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
 	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
 	NULL
 };

 static const struct attribute_group abx500_temp_group = {
 	.attrs = abx500_temp_attributes,
 	.is_visible = abx500_attrs_visible,
 };

 static irqreturn_t abx500_temp_irq_handler(int irq, void *irq_data)
 {
 	struct platform_device *pdev = irq_data;
 	struct abx500_temp *data = platform_get_drvdata(pdev);

 	data->ops.irq_handler(irq, data);
 	return IRQ_HANDLED;
 }

 static int setup_irqs(struct platform_device *pdev)
 {
 	int ret;
 	int irq = platform_get_irq_byname(pdev, "ABX500_TEMP_WARM");

 	if (irq < 0) {
 		dev_err(&pdev->dev, "Get irq by name failed\n");
 		return irq;
 	}

 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 		abx500_temp_irq_handler, 0, "abx500-temp", pdev);
 	if (ret < 0)
 		dev_err(&pdev->dev, "Request threaded irq failed (%d)\n", ret);

 	return ret;
 }

 static int abx500_temp_probe(struct platform_device *pdev)
 {
 	struct abx500_temp *data;
 	int err;

 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;

 	data->pdev = pdev;
 	mutex_init(&data->lock);

 	/* Chip specific initialization */
 	err = abx500_hwmon_init(data);
 	if (err	< 0 || !data->ops.read_sensor || !data->ops.show_name ||
 			!data->ops.show_label)
 		return err;

 	INIT_DEFERRABLE_WORK(&data->work, gpadc_monitor);

 	platform_set_drvdata(pdev, data);

 	err = sysfs_create_group(&pdev->dev.kobj, &abx500_temp_group);
 	if (err < 0) {
 		dev_err(&pdev->dev, "Create sysfs group failed (%d)\n", err);
 		return err;
 	}

 	data->hwmon_dev = hwmon_device_register(&pdev->dev);
 	if (IS_ERR(data->hwmon_dev)) {
 		err = PTR_ERR(data->hwmon_dev);
 		dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
 		goto exit_sysfs_group;
 	}

 	if (data->ops.irq_handler) {
 		err = setup_irqs(pdev);
 		if (err < 0)
 			goto exit_hwmon_reg;
 	}
 	return 0;

 exit_hwmon_reg:
 	hwmon_device_unregister(data->hwmon_dev);
 exit_sysfs_group:
 	sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group);
 	return err;
 }

 static int abx500_temp_remove(struct platform_device *pdev)
 {
 	struct abx500_temp *data = platform_get_drvdata(pdev);

 	cancel_delayed_work_sync(&data->work);
 	hwmon_device_unregister(data->hwmon_dev);
 	sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group);

 	return 0;
 }

 static int abx500_temp_suspend(struct platform_device *pdev,
 			       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" },
 	{},
 };
 MODULE_DEVICE_TABLE(of, abx500_temp_match);
 #endif

 static struct platform_driver abx500_temp_driver = {
 	.driver = {
 		.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 <[email protected]>");
 MODULE_DESCRIPTION("ABX500 temperature driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) ST-Ericsson 2010 - 2013
	* Author: Martin Persson <[email protected]>
	* Hongbo Zhang <[email protected]>
	* License Terms: GNU General Public License v2
	*
	* ABX500 does not provide auto ADC, so to monitor the required temperatures,
	* a periodic work is used. It is more important to not wake up the CPU than
	* to perform this job, hence the use of a deferred delay.
	*
	* A deferred delay for thermal monitor is considered safe because:
	* If the chip gets too hot during a sleep state it's most likely due to
	* external factors, such as the surrounding temperature. I.e. no SW decisions
	* will make any difference.
	*/

	#include <linux/err.h>
	#include <linux/hwmon.h>
	#include <linux/hwmon-sysfs.h>
	#include <linux/interrupt.h>
	#include <linux/jiffies.h>
	#include <linux/module.h>
	#include <linux/mutex.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/pm.h>
	#include <linux/slab.h>
	#include <linux/sysfs.h>
	#include <linux/workqueue.h>
	#include "abx500.h"

	#define DEFAULT_MONITOR_DELAY HZ
	#define DEFAULT_MAX_TEMP 130

	static inline void schedule_monitor(struct abx500_temp *data)
	{
	data->work_active = true;
	schedule_delayed_work(&data->work, DEFAULT_MONITOR_DELAY);
	}

	static void threshold_updated(struct abx500_temp *data)
	{
	int i;
	for (i = 0; i < data->monitored_sensors; i++)
	if (data->max[i] != 0 \|\| data->min[i] != 0) {
	schedule_monitor(data);
	return;
	}

	dev_dbg(&data->pdev->dev, "No active thresholds.\n");
	cancel_delayed_work_sync(&data->work);
	data->work_active = false;
	}

	static void gpadc_monitor(struct work_struct *work)
	{
	int temp, i, ret;
	char alarm_node[30];
	bool updated_min_alarm, updated_max_alarm;
	struct abx500_temp *data;

	data = container_of(work, struct abx500_temp, work.work);
	mutex_lock(&data->lock);

	for (i = 0; i < data->monitored_sensors; i++) {
	/* Thresholds are considered inactive if set to 0 */
	if (data->max[i] == 0 && data->min[i] == 0)
	continue;

	if (data->max[i] < data->min[i])
	continue;

	ret = data->ops.read_sensor(data, data->gpadc_addr[i], &temp);
	if (ret < 0) {
	dev_err(&data->pdev->dev, "GPADC read failed\n");
	continue;
	}

	updated_min_alarm = false;
	updated_max_alarm = false;

	if (data->min[i] != 0) {
	if (temp < data->min[i]) {
	if (data->min_alarm[i] == false) {
	data->min_alarm[i] = true;
	updated_min_alarm = true;
	}
	} else {
	if (data->min_alarm[i] == true) {
	data->min_alarm[i] = false;
	updated_min_alarm = true;
	}
	}
	}
	if (data->max[i] != 0) {
	if (temp > data->max[i]) {
	if (data->max_alarm[i] == false) {
	data->max_alarm[i] = true;
	updated_max_alarm = true;
	}
	} else if (temp < data->max[i] - data->max_hyst[i]) {
	if (data->max_alarm[i] == true) {
	data->max_alarm[i] = false;
	updated_max_alarm = true;
	}
	}
	}

	if (updated_min_alarm) {
	ret = sprintf(alarm_node, "temp%d_min_alarm", i + 1);
	sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
	}
	if (updated_max_alarm) {
	ret = sprintf(alarm_node, "temp%d_max_alarm", i + 1);
	sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
	}
	}

	schedule_monitor(data);
	mutex_unlock(&data->lock);
	}

	/* HWMON sysfs interfaces */
	static ssize_t name_show(struct device dev, struct device_attribute devattr,
	char *buf)
	{
	struct abx500_temp *data = dev_get_drvdata(dev);
	/* Show chip name */
	return data->ops.show_name(dev, devattr, buf);
	}

	static ssize_t label_show(struct device *dev,
	struct device_attribute devattr, char buf)
	{
	struct abx500_temp *data = dev_get_drvdata(dev);
	/* Show each sensor label */
	return data->ops.show_label(dev, devattr, buf);
	}

	static ssize_t input_show(struct device *dev,
	struct device_attribute devattr, char buf)
	{
	int ret, temp;
	struct abx500_temp *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	u8 gpadc_addr = data->gpadc_addr[attr->index];

	ret = data->ops.read_sensor(data, gpadc_addr, &temp);
	if (ret < 0)
	return ret;

	return sprintf(buf, "%d\n", temp);
	}

	/* Set functions (RW nodes) */
	static ssize_t min_store(struct device dev, struct device_attribute devattr,
	const char *buf, size_t count)
	{
	unsigned long val;
	struct abx500_temp *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	int res = kstrtol(buf, 10, &val);
	if (res < 0)
	return res;

	val = clamp_val(val, 0, DEFAULT_MAX_TEMP);

	mutex_lock(&data->lock);
	data->min[attr->index] = val;
	threshold_updated(data);
	mutex_unlock(&data->lock);

	return count;
	}

	static ssize_t max_store(struct device dev, struct device_attribute devattr,
	const char *buf, size_t count)
	{
	unsigned long val;
	struct abx500_temp *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	int res = kstrtol(buf, 10, &val);
	if (res < 0)
	return res;

	val = clamp_val(val, 0, DEFAULT_MAX_TEMP);

	mutex_lock(&data->lock);
	data->max[attr->index] = val;
	threshold_updated(data);
	mutex_unlock(&data->lock);

	return count;
	}

	static ssize_t max_hyst_store(struct device *dev,
	struct device_attribute *devattr,
	const char *buf, size_t count)
	{
	unsigned long val;
	struct abx500_temp *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	int res = kstrtoul(buf, 10, &val);
	if (res < 0)
	return res;

	val = clamp_val(val, 0, DEFAULT_MAX_TEMP);

	mutex_lock(&data->lock);
	data->max_hyst[attr->index] = val;
	threshold_updated(data);
	mutex_unlock(&data->lock);

	return count;
	}

	/* Show functions (RO nodes) */
	static ssize_t min_show(struct device dev, struct device_attribute devattr,
	char *buf)
	{
	struct abx500_temp *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

	return sprintf(buf, "%lu\n", data->min[attr->index]);
	}

	static ssize_t max_show(struct device dev, struct device_attribute devattr,
	char *buf)
	{
	struct abx500_temp *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

	return sprintf(buf, "%lu\n", data->max[attr->index]);
	}

	static ssize_t max_hyst_show(struct device *dev,
	struct device_attribute devattr, char buf)
	{
	struct abx500_temp *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

	return sprintf(buf, "%lu\n", data->max_hyst[attr->index]);
	}

	static ssize_t min_alarm_show(struct device *dev,
	struct device_attribute devattr, char buf)
	{
	struct abx500_temp *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

	return sprintf(buf, "%d\n", data->min_alarm[attr->index]);
	}

	static ssize_t max_alarm_show(struct device *dev,
	struct device_attribute devattr, char buf)
	{
	struct abx500_temp *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);

	return sprintf(buf, "%d\n", data->max_alarm[attr->index]);
	}

	static umode_t abx500_attrs_visible(struct kobject *kobj,
	struct attribute *attr, int n)
	{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct abx500_temp *data = dev_get_drvdata(dev);

	if (data->ops.is_visible)
	return data->ops.is_visible(attr, n);

	return attr->mode;
	}

	/* Chip name, required by hwmon */
	static SENSOR_DEVICE_ATTR_RO(name, name, 0);

	/* GPADC - SENSOR1 */
	static SENSOR_DEVICE_ATTR_RO(temp1_label, label, 0);
	static SENSOR_DEVICE_ATTR_RO(temp1_input, input, 0);
	static SENSOR_DEVICE_ATTR_RW(temp1_min, min, 0);
	static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0);
	static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, max_hyst, 0);
	static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, min_alarm, 0);
	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, max_alarm, 0);

	/* GPADC - SENSOR2 */
	static SENSOR_DEVICE_ATTR_RO(temp2_label, label, 1);
	static SENSOR_DEVICE_ATTR_RO(temp2_input, input, 1);
	static SENSOR_DEVICE_ATTR_RW(temp2_min, min, 1);
	static SENSOR_DEVICE_ATTR_RW(temp2_max, max, 1);
	static SENSOR_DEVICE_ATTR_RW(temp2_max_hyst, max_hyst, 1);
	static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, min_alarm, 1);
	static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, max_alarm, 1);

	/* GPADC - SENSOR3 */
	static SENSOR_DEVICE_ATTR_RO(temp3_label, label, 2);
	static SENSOR_DEVICE_ATTR_RO(temp3_input, input, 2);
	static SENSOR_DEVICE_ATTR_RW(temp3_min, min, 2);
	static SENSOR_DEVICE_ATTR_RW(temp3_max, max, 2);
	static SENSOR_DEVICE_ATTR_RW(temp3_max_hyst, max_hyst, 2);
	static SENSOR_DEVICE_ATTR_RO(temp3_min_alarm, min_alarm, 2);
	static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, max_alarm, 2);

	/* GPADC - SENSOR4 */
	static SENSOR_DEVICE_ATTR_RO(temp4_label, label, 3);
	static SENSOR_DEVICE_ATTR_RO(temp4_input, input, 3);
	static SENSOR_DEVICE_ATTR_RW(temp4_min, min, 3);
	static SENSOR_DEVICE_ATTR_RW(temp4_max, max, 3);
	static SENSOR_DEVICE_ATTR_RW(temp4_max_hyst, max_hyst, 3);
	static SENSOR_DEVICE_ATTR_RO(temp4_min_alarm, min_alarm, 3);
	static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, max_alarm, 3);

	static struct attribute *abx500_temp_attributes[] = {
	&sensor_dev_attr_name.dev_attr.attr,

	&sensor_dev_attr_temp1_label.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,

	&sensor_dev_attr_temp2_label.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,

	&sensor_dev_attr_temp3_label.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,

	&sensor_dev_attr_temp4_label.dev_attr.attr,
	&sensor_dev_attr_temp4_input.dev_attr.attr,
	&sensor_dev_attr_temp4_min.dev_attr.attr,
	&sensor_dev_attr_temp4_max.dev_attr.attr,
	&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	NULL
	};

	static const struct attribute_group abx500_temp_group = {
	.attrs = abx500_temp_attributes,
	.is_visible = abx500_attrs_visible,
	};

	static irqreturn_t abx500_temp_irq_handler(int irq, void *irq_data)
	{
	struct platform_device *pdev = irq_data;
	struct abx500_temp *data = platform_get_drvdata(pdev);

	data->ops.irq_handler(irq, data);
	return IRQ_HANDLED;
	}

	static int setup_irqs(struct platform_device *pdev)
	{
	int ret;
	int irq = platform_get_irq_byname(pdev, "ABX500_TEMP_WARM");

	if (irq < 0) {
	dev_err(&pdev->dev, "Get irq by name failed\n");
	return irq;
	}

	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
	abx500_temp_irq_handler, 0, "abx500-temp", pdev);
	if (ret < 0)
	dev_err(&pdev->dev, "Request threaded irq failed (%d)\n", ret);

	return ret;
	}

	static int abx500_temp_probe(struct platform_device *pdev)
	{
	struct abx500_temp *data;
	int err;

	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
	return -ENOMEM;

	data->pdev = pdev;
	mutex_init(&data->lock);

	/* Chip specific initialization */
	err = abx500_hwmon_init(data);
	if (err < 0 \|\| !data->ops.read_sensor \|\| !data->ops.show_name \|\|
	!data->ops.show_label)
	return err;

	INIT_DEFERRABLE_WORK(&data->work, gpadc_monitor);

	platform_set_drvdata(pdev, data);

	err = sysfs_create_group(&pdev->dev.kobj, &abx500_temp_group);
	if (err < 0) {
	dev_err(&pdev->dev, "Create sysfs group failed (%d)\n", err);
	return err;
	}

	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	if (IS_ERR(data->hwmon_dev)) {
	err = PTR_ERR(data->hwmon_dev);
	dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
	goto exit_sysfs_group;
	}

	if (data->ops.irq_handler) {
	err = setup_irqs(pdev);
	if (err < 0)
	goto exit_hwmon_reg;
	}
	return 0;

	exit_hwmon_reg:
	hwmon_device_unregister(data->hwmon_dev);
	exit_sysfs_group:
	sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group);
	return err;
	}

	static int abx500_temp_remove(struct platform_device *pdev)
	{
	struct abx500_temp *data = platform_get_drvdata(pdev);

	cancel_delayed_work_sync(&data->work);
	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group);

	return 0;
	}

	static int abx500_temp_suspend(struct platform_device *pdev,
	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" },
	{},
	};
	MODULE_DEVICE_TABLE(of, abx500_temp_match);
	#endif

	static struct platform_driver abx500_temp_driver = {
	.driver = {
	.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 <[email protected]>");
	MODULE_DESCRIPTION("ABX500 temperature driver");
	MODULE_LICENSE("GPL");