[linux-2.6-block.git] / drivers / hwmon / abx500.c

/*
 * Copyright (C) ST-Ericsson 2010 - 2013
 * Author: Martin Persson <martin.persson@stericsson.com>
 *         Hongbo Zhang <hongbo.zhang@linaro.org>
 * 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 <martin.persson@stericsson.com>");
MODULE_DESCRIPTION("ABX500 temperature driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
0bbb06ed HZ	1	/*
	2	* Copyright (C) ST-Ericsson 2010 - 2013
	3	* Author: Martin Persson <martin.persson@stericsson.com>
	4	* Hongbo Zhang <hongbo.zhang@linaro.org>
	5	* License Terms: GNU General Public License v2
	6	*
	7	* ABX500 does not provide auto ADC, so to monitor the required temperatures,
	8	* a periodic work is used. It is more important to not wake up the CPU than
	9	* to perform this job, hence the use of a deferred delay.
	10	*
	11	* A deferred delay for thermal monitor is considered safe because:
	12	* If the chip gets too hot during a sleep state it's most likely due to
	13	* external factors, such as the surrounding temperature. I.e. no SW decisions
	14	* will make any difference.
	15	*/
	16
	17	#include <linux/err.h>
	18	#include <linux/hwmon.h>
	19	#include <linux/hwmon-sysfs.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/jiffies.h>
	22	#include <linux/module.h>
	23	#include <linux/mutex.h>
	24	#include <linux/of.h>
	25	#include <linux/platform_device.h>
	26	#include <linux/pm.h>
	27	#include <linux/slab.h>
	28	#include <linux/sysfs.h>
	29	#include <linux/workqueue.h>
	30	#include "abx500.h"
	31
	32	#define DEFAULT_MONITOR_DELAY HZ
	33	#define DEFAULT_MAX_TEMP 130
	34
	35	static inline void schedule_monitor(struct abx500_temp *data)
	36	{
	37	data->work_active = true;
	38	schedule_delayed_work(&data->work, DEFAULT_MONITOR_DELAY);
	39	}
	40
	41	static void threshold_updated(struct abx500_temp *data)
	42	{
	43	int i;
	44	for (i = 0; i < data->monitored_sensors; i++)
	45	if (data->max[i] != 0 \|\| data->min[i] != 0) {
	46	schedule_monitor(data);
	47	return;
	48	}
	49
	50	dev_dbg(&data->pdev->dev, "No active thresholds.\n");
	51	cancel_delayed_work_sync(&data->work);
	52	data->work_active = false;
	53	}
	54
	55	static void gpadc_monitor(struct work_struct *work)
	56	{
	57	int temp, i, ret;
	58	char alarm_node[30];
	59	bool updated_min_alarm, updated_max_alarm;
	60	struct abx500_temp *data;
	61
	62	data = container_of(work, struct abx500_temp, work.work);
	63	mutex_lock(&data->lock);
	64
65	for (i = 0; i < data->monitored_sensors; i++) {
66	/* Thresholds are considered inactive if set to 0 */
67	if (data->max[i] == 0 && data->min[i] == 0)
68	continue;
69
70	if (data->max[i] < data->min[i])
71	continue;
72
73	ret = data->ops.read_sensor(data, data->gpadc_addr[i], &temp);
74	if (ret < 0) {
75	dev_err(&data->pdev->dev, "GPADC read failed\n");
76	continue;
77	}
78
79	updated_min_alarm = false;
80	updated_max_alarm = false;
81
82	if (data->min[i] != 0) {
83	if (temp < data->min[i]) {
84	if (data->min_alarm[i] == false) {
85	data->min_alarm[i] = true;
86	updated_min_alarm = true;
87	}
88	} else {
89	if (data->min_alarm[i] == true) {
90	data->min_alarm[i] = false;
91	updated_min_alarm = true;
92	}
93	}
94	}
95	if (data->max[i] != 0) {
96	if (temp > data->max[i]) {
97	if (data->max_alarm[i] == false) {
98	data->max_alarm[i] = true;
99	updated_max_alarm = true;
100	}
101	} else if (temp < data->max[i] - data->max_hyst[i]) {
102	if (data->max_alarm[i] == true) {
103	data->max_alarm[i] = false;
104	updated_max_alarm = true;
105	}
106	}
107	}
108
109	if (updated_min_alarm) {
110	ret = sprintf(alarm_node, "temp%d_min_alarm", i + 1);
111	sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
112	}
113	if (updated_max_alarm) {
114	ret = sprintf(alarm_node, "temp%d_max_alarm", i + 1);
115	sysfs_notify(&data->pdev->dev.kobj, NULL, alarm_node);
116	}
117	}
118
119	schedule_monitor(data);
120	mutex_unlock(&data->lock);
121	}
122
123	/* HWMON sysfs interfaces */
4708e968	124	static ssize_t name_show(struct device dev, struct device_attribute devattr,
0bbb06ed HZ	125	char *buf)
	126	{
	127	struct abx500_temp *data = dev_get_drvdata(dev);
	128	/* Show chip name */
	129	return data->ops.show_name(dev, devattr, buf);
	130	}
	131
4708e968	132	static ssize_t label_show(struct device *dev,
0bbb06ed HZ	133	struct device_attribute devattr, char buf)
	134	{
	135	struct abx500_temp *data = dev_get_drvdata(dev);
	136	/* Show each sensor label */
	137	return data->ops.show_label(dev, devattr, buf);
	138	}
	139
4708e968	140	static ssize_t input_show(struct device *dev,
0bbb06ed HZ	141	struct device_attribute devattr, char buf)
	142	{
	143	int ret, temp;
	144	struct abx500_temp *data = dev_get_drvdata(dev);
	145	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	146	u8 gpadc_addr = data->gpadc_addr[attr->index];
	147
	148	ret = data->ops.read_sensor(data, gpadc_addr, &temp);
	149	if (ret < 0)
	150	return ret;
	151
	152	return sprintf(buf, "%d\n", temp);
	153	}
	154
	155	/* Set functions (RW nodes) */
4708e968 GR	156	static ssize_t min_store(struct device dev, struct device_attribute devattr,
4708e968 GR	157	const char *buf, size_t count)
0bbb06ed HZ	158	{
	159	unsigned long val;
	160	struct abx500_temp *data = dev_get_drvdata(dev);
	161	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	162	int res = kstrtol(buf, 10, &val);
	163	if (res < 0)
	164	return res;
	165
	166	val = clamp_val(val, 0, DEFAULT_MAX_TEMP);
	167
	168	mutex_lock(&data->lock);
	169	data->min[attr->index] = val;
	170	threshold_updated(data);
	171	mutex_unlock(&data->lock);
	172
	173	return count;
	174	}
	175
4708e968 GR	176	static ssize_t max_store(struct device dev, struct device_attribute devattr,
4708e968 GR	177	const char *buf, size_t count)
0bbb06ed HZ	178	{
	179	unsigned long val;
	180	struct abx500_temp *data = dev_get_drvdata(dev);
	181	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	182	int res = kstrtol(buf, 10, &val);
	183	if (res < 0)
	184	return res;
	185
	186	val = clamp_val(val, 0, DEFAULT_MAX_TEMP);
	187
	188	mutex_lock(&data->lock);
	189	data->max[attr->index] = val;
	190	threshold_updated(data);
	191	mutex_unlock(&data->lock);
	192
	193	return count;
	194	}
	195
4708e968 GR	196	static ssize_t max_hyst_store(struct device *dev,
	197	struct device_attribute *devattr,
	198	const char *buf, size_t count)
0bbb06ed HZ	199	{
	200	unsigned long val;
	201	struct abx500_temp *data = dev_get_drvdata(dev);
	202	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	203	int res = kstrtoul(buf, 10, &val);
	204	if (res < 0)
	205	return res;
	206
	207	val = clamp_val(val, 0, DEFAULT_MAX_TEMP);
	208
	209	mutex_lock(&data->lock);
	210	data->max_hyst[attr->index] = val;
	211	threshold_updated(data);
	212	mutex_unlock(&data->lock);
	213
	214	return count;
	215	}
	216
	217	/* Show functions (RO nodes) */
4708e968 GR	218	static ssize_t min_show(struct device dev, struct device_attribute devattr,
4708e968 GR	219	char *buf)
0bbb06ed HZ	220	{
	221	struct abx500_temp *data = dev_get_drvdata(dev);
	222	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	223
a14c7072	224	return sprintf(buf, "%lu\n", data->min[attr->index]);
0bbb06ed HZ	225	}
0bbb06ed HZ	226
4708e968 GR	227	static ssize_t max_show(struct device dev, struct device_attribute devattr,
4708e968 GR	228	char *buf)
0bbb06ed HZ	229	{
	230	struct abx500_temp *data = dev_get_drvdata(dev);
	231	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	232
a14c7072	233	return sprintf(buf, "%lu\n", data->max[attr->index]);
0bbb06ed HZ	234	}
0bbb06ed HZ	235
4708e968	236	static ssize_t max_hyst_show(struct device *dev,
0bbb06ed HZ	237	struct device_attribute devattr, char buf)
	238	{
	239	struct abx500_temp *data = dev_get_drvdata(dev);
	240	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	241
a14c7072	242	return sprintf(buf, "%lu\n", data->max_hyst[attr->index]);
0bbb06ed HZ	243	}
0bbb06ed HZ	244
4708e968	245	static ssize_t min_alarm_show(struct device *dev,
0bbb06ed HZ	246	struct device_attribute devattr, char buf)
	247	{
	248	struct abx500_temp *data = dev_get_drvdata(dev);
	249	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	250
	251	return sprintf(buf, "%d\n", data->min_alarm[attr->index]);
	252	}
	253
4708e968	254	static ssize_t max_alarm_show(struct device *dev,
0bbb06ed HZ	255	struct device_attribute devattr, char buf)
	256	{
	257	struct abx500_temp *data = dev_get_drvdata(dev);
	258	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	259
	260	return sprintf(buf, "%d\n", data->max_alarm[attr->index]);
	261	}
	262
60b7bf4e	263	static umode_t abx500_attrs_visible(struct kobject *kobj,
0bbb06ed HZ	264	struct attribute *attr, int n)
	265	{
	266	struct device *dev = container_of(kobj, struct device, kobj);
	267	struct abx500_temp *data = dev_get_drvdata(dev);
	268
	269	if (data->ops.is_visible)
	270	return data->ops.is_visible(attr, n);
	271
	272	return attr->mode;
	273	}
	274
	275	/* Chip name, required by hwmon */
4708e968	276	static SENSOR_DEVICE_ATTR_RO(name, name, 0);
0bbb06ed HZ	277
0bbb06ed HZ	278	/* GPADC - SENSOR1 */
4708e968 GR	279	static SENSOR_DEVICE_ATTR_RO(temp1_label, label, 0);
	280	static SENSOR_DEVICE_ATTR_RO(temp1_input, input, 0);
	281	static SENSOR_DEVICE_ATTR_RW(temp1_min, min, 0);
	282	static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0);
	283	static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, max_hyst, 0);
	284	static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, min_alarm, 0);
	285	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, max_alarm, 0);
0bbb06ed HZ	286
0bbb06ed HZ	287	/* GPADC - SENSOR2 */
4708e968 GR	288	static SENSOR_DEVICE_ATTR_RO(temp2_label, label, 1);
	289	static SENSOR_DEVICE_ATTR_RO(temp2_input, input, 1);
	290	static SENSOR_DEVICE_ATTR_RW(temp2_min, min, 1);
	291	static SENSOR_DEVICE_ATTR_RW(temp2_max, max, 1);
	292	static SENSOR_DEVICE_ATTR_RW(temp2_max_hyst, max_hyst, 1);
	293	static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, min_alarm, 1);
	294	static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, max_alarm, 1);
0bbb06ed HZ	295
0bbb06ed HZ	296	/* GPADC - SENSOR3 */
4708e968 GR	297	static SENSOR_DEVICE_ATTR_RO(temp3_label, label, 2);
	298	static SENSOR_DEVICE_ATTR_RO(temp3_input, input, 2);
	299	static SENSOR_DEVICE_ATTR_RW(temp3_min, min, 2);
	300	static SENSOR_DEVICE_ATTR_RW(temp3_max, max, 2);
	301	static SENSOR_DEVICE_ATTR_RW(temp3_max_hyst, max_hyst, 2);
	302	static SENSOR_DEVICE_ATTR_RO(temp3_min_alarm, min_alarm, 2);
	303	static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, max_alarm, 2);
0bbb06ed HZ	304
0bbb06ed HZ	305	/* GPADC - SENSOR4 */
4708e968 GR	306	static SENSOR_DEVICE_ATTR_RO(temp4_label, label, 3);
	307	static SENSOR_DEVICE_ATTR_RO(temp4_input, input, 3);
	308	static SENSOR_DEVICE_ATTR_RW(temp4_min, min, 3);
	309	static SENSOR_DEVICE_ATTR_RW(temp4_max, max, 3);
	310	static SENSOR_DEVICE_ATTR_RW(temp4_max_hyst, max_hyst, 3);
	311	static SENSOR_DEVICE_ATTR_RO(temp4_min_alarm, min_alarm, 3);
	312	static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, max_alarm, 3);
0bbb06ed	313
0b905d83	314	static struct attribute *abx500_temp_attributes[] = {
0bbb06ed HZ	315	&sensor_dev_attr_name.dev_attr.attr,
	316
	317	&sensor_dev_attr_temp1_label.dev_attr.attr,
	318	&sensor_dev_attr_temp1_input.dev_attr.attr,
	319	&sensor_dev_attr_temp1_min.dev_attr.attr,
	320	&sensor_dev_attr_temp1_max.dev_attr.attr,
	321	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	322	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	323	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	324
	325	&sensor_dev_attr_temp2_label.dev_attr.attr,
	326	&sensor_dev_attr_temp2_input.dev_attr.attr,
	327	&sensor_dev_attr_temp2_min.dev_attr.attr,
	328	&sensor_dev_attr_temp2_max.dev_attr.attr,
	329	&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
	330	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	331	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	332
	333	&sensor_dev_attr_temp3_label.dev_attr.attr,
	334	&sensor_dev_attr_temp3_input.dev_attr.attr,
	335	&sensor_dev_attr_temp3_min.dev_attr.attr,
	336	&sensor_dev_attr_temp3_max.dev_attr.attr,
	337	&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
	338	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
	339	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	340
	341	&sensor_dev_attr_temp4_label.dev_attr.attr,
	342	&sensor_dev_attr_temp4_input.dev_attr.attr,
	343	&sensor_dev_attr_temp4_min.dev_attr.attr,
	344	&sensor_dev_attr_temp4_max.dev_attr.attr,
	345	&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
	346	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
	347	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	348	NULL
	349	};
	350
	351	static const struct attribute_group abx500_temp_group = {
	352	.attrs = abx500_temp_attributes,
	353	.is_visible = abx500_attrs_visible,
	354	};
	355
	356	static irqreturn_t abx500_temp_irq_handler(int irq, void *irq_data)
	357	{
	358	struct platform_device *pdev = irq_data;
	359	struct abx500_temp *data = platform_get_drvdata(pdev);
	360
	361	data->ops.irq_handler(irq, data);
	362	return IRQ_HANDLED;
	363	}
	364
	365	static int setup_irqs(struct platform_device *pdev)
	366	{
	367	int ret;
	368	int irq = platform_get_irq_byname(pdev, "ABX500_TEMP_WARM");
	369
	370	if (irq < 0) {
	371	dev_err(&pdev->dev, "Get irq by name failed\n");
	372	return irq;
	373	}
	374
	375	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
47e4b5e1	376	abx500_temp_irq_handler, 0, "abx500-temp", pdev);
0bbb06ed HZ	377	if (ret < 0)
	378	dev_err(&pdev->dev, "Request threaded irq failed (%d)\n", ret);
	379
	380	return ret;
	381	}
	382
	383	static int abx500_temp_probe(struct platform_device *pdev)
	384	{
	385	struct abx500_temp *data;
	386	int err;
	387
	388	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
	389	if (!data)
	390	return -ENOMEM;
	391
	392	data->pdev = pdev;
	393	mutex_init(&data->lock);
	394
	395	/* Chip specific initialization */
	396	err = abx500_hwmon_init(data);
	397	if (err < 0 \|\| !data->ops.read_sensor \|\| !data->ops.show_name \|\|
	398	!data->ops.show_label)
	399	return err;
	400
	401	INIT_DEFERRABLE_WORK(&data->work, gpadc_monitor);
	402
	403	platform_set_drvdata(pdev, data);
	404
	405	err = sysfs_create_group(&pdev->dev.kobj, &abx500_temp_group);
	406	if (err < 0) {
	407	dev_err(&pdev->dev, "Create sysfs group failed (%d)\n", err);
	408	return err;
	409	}
	410
	411	data->hwmon_dev = hwmon_device_register(&pdev->dev);
	412	if (IS_ERR(data->hwmon_dev)) {
	413	err = PTR_ERR(data->hwmon_dev);
	414	dev_err(&pdev->dev, "Class registration failed (%d)\n", err);
	415	goto exit_sysfs_group;
	416	}
	417
	418	if (data->ops.irq_handler) {
	419	err = setup_irqs(pdev);
	420	if (err < 0)
	421	goto exit_hwmon_reg;
	422	}
	423	return 0;
	424
	425	exit_hwmon_reg:
	426	hwmon_device_unregister(data->hwmon_dev);
	427	exit_sysfs_group:
	428	sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group);
	429	return err;
	430	}
	431
	432	static int abx500_temp_remove(struct platform_device *pdev)
	433	{
	434	struct abx500_temp *data = platform_get_drvdata(pdev);
	435
	436	cancel_delayed_work_sync(&data->work);
	437	hwmon_device_unregister(data->hwmon_dev);
	438	sysfs_remove_group(&pdev->dev.kobj, &abx500_temp_group);
	439
	440	return 0;
441	}
442
443	static int abx500_temp_suspend(struct platform_device *pdev,
444	pm_message_t state)
445	{
446	struct abx500_temp *data = platform_get_drvdata(pdev);
447
448	if (data->work_active)
449	cancel_delayed_work_sync(&data->work);
450
451	return 0;
452	}
453
454	static int abx500_temp_resume(struct platform_device *pdev)
455	{
456	struct abx500_temp *data = platform_get_drvdata(pdev);
457
458	if (data->work_active)
459	schedule_monitor(data);
460
461	return 0;
462	}
463
464	#ifdef CONFIG_OF
465	static const struct of_device_id abx500_temp_match[] = {
466	{ .compatible = "stericsson,abx500-temp" },
467	{},
468	};
3245acbc	469	MODULE_DEVICE_TABLE(of, abx500_temp_match);
0bbb06ed HZ	470	#endif
	471
	472	static struct platform_driver abx500_temp_driver = {
	473	.driver = {
0bbb06ed HZ	474	.name = "abx500-temp",
	475	.of_match_table = of_match_ptr(abx500_temp_match),
	476	},
	477	.suspend = abx500_temp_suspend,
	478	.resume = abx500_temp_resume,
	479	.probe = abx500_temp_probe,
	480	.remove = abx500_temp_remove,
	481	};
	482
	483	module_platform_driver(abx500_temp_driver);
	484
	485	MODULE_AUTHOR("Martin Persson <martin.persson@stericsson.com>");
	486	MODULE_DESCRIPTION("ABX500 temperature driver");
	487	MODULE_LICENSE("GPL");