[mirror_ubuntu-hirsute-kernel.git] / drivers / hwmon / adt7x10.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware
 *	 monitoring
 * This driver handles the ADT7410 and compatible digital temperature sensors.
 * Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
 * based on lm75.c by Frodo Looijaard <frodol@dds.nl>
 * and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/interrupt.h>

#include "adt7x10.h"

/*
 * ADT7X10 status
 */
#define ADT7X10_STAT_T_LOW		(1 << 4)
#define ADT7X10_STAT_T_HIGH		(1 << 5)
#define ADT7X10_STAT_T_CRIT		(1 << 6)
#define ADT7X10_STAT_NOT_RDY		(1 << 7)

/*
 * ADT7X10 config
 */
#define ADT7X10_FAULT_QUEUE_MASK	(1 << 0 | 1 << 1)
#define ADT7X10_CT_POLARITY		(1 << 2)
#define ADT7X10_INT_POLARITY		(1 << 3)
#define ADT7X10_EVENT_MODE		(1 << 4)
#define ADT7X10_MODE_MASK		(1 << 5 | 1 << 6)
#define ADT7X10_FULL			(0 << 5 | 0 << 6)
#define ADT7X10_PD			(1 << 5 | 1 << 6)
#define ADT7X10_RESOLUTION		(1 << 7)

/*
 * ADT7X10 masks
 */
#define ADT7X10_T13_VALUE_MASK		0xFFF8
#define ADT7X10_T_HYST_MASK		0xF

/* straight from the datasheet */
#define ADT7X10_TEMP_MIN (-55000)
#define ADT7X10_TEMP_MAX 150000

/* Each client has this additional data */
struct adt7x10_data {
	const struct adt7x10_ops *ops;
	const char		*name;
	struct device		*hwmon_dev;
	struct mutex		update_lock;
	u8			config;
	u8			oldconfig;
	bool			valid;		/* true if registers valid */
	unsigned long		last_updated;	/* In jiffies */
	s16			temp[4];	/* Register values,
						   0 = input
						   1 = high
						   2 = low
						   3 = critical */
	u8			hyst;		/* hysteresis offset */
};

static int adt7x10_read_byte(struct device *dev, u8 reg)
{
	struct adt7x10_data *d = dev_get_drvdata(dev);
	return d->ops->read_byte(dev, reg);
}

static int adt7x10_write_byte(struct device *dev, u8 reg, u8 data)
{
	struct adt7x10_data *d = dev_get_drvdata(dev);
	return d->ops->write_byte(dev, reg, data);
}

static int adt7x10_read_word(struct device *dev, u8 reg)
{
	struct adt7x10_data *d = dev_get_drvdata(dev);
	return d->ops->read_word(dev, reg);
}

static int adt7x10_write_word(struct device *dev, u8 reg, u16 data)
{
	struct adt7x10_data *d = dev_get_drvdata(dev);
	return d->ops->write_word(dev, reg, data);
}

static const u8 ADT7X10_REG_TEMP[4] = {
	ADT7X10_TEMPERATURE,		/* input */
	ADT7X10_T_ALARM_HIGH,		/* high */
	ADT7X10_T_ALARM_LOW,		/* low */
	ADT7X10_T_CRIT,			/* critical */
};

static irqreturn_t adt7x10_irq_handler(int irq, void *private)
{
	struct device *dev = private;
	int status;

	status = adt7x10_read_byte(dev, ADT7X10_STATUS);
	if (status < 0)
		return IRQ_HANDLED;

	if (status & ADT7X10_STAT_T_HIGH)
		sysfs_notify(&dev->kobj, NULL, "temp1_max_alarm");
	if (status & ADT7X10_STAT_T_LOW)
		sysfs_notify(&dev->kobj, NULL, "temp1_min_alarm");
	if (status & ADT7X10_STAT_T_CRIT)
		sysfs_notify(&dev->kobj, NULL, "temp1_crit_alarm");

	return IRQ_HANDLED;
}

static int adt7x10_temp_ready(struct device *dev)
{
	int i, status;

	for (i = 0; i < 6; i++) {
		status = adt7x10_read_byte(dev, ADT7X10_STATUS);
		if (status < 0)
			return status;
		if (!(status & ADT7X10_STAT_NOT_RDY))
			return 0;
		msleep(60);
	}
	return -ETIMEDOUT;
}

static int adt7x10_update_temp(struct device *dev)
{
	struct adt7x10_data *data = dev_get_drvdata(dev);
	int ret = 0;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		int temp;

		dev_dbg(dev, "Starting update\n");

		ret = adt7x10_temp_ready(dev); /* check for new value */
		if (ret)
			goto abort;

		temp = adt7x10_read_word(dev, ADT7X10_REG_TEMP[0]);
		if (temp < 0) {
			ret = temp;
			dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
				ADT7X10_REG_TEMP[0], ret);
			goto abort;
		}
		data->temp[0] = temp;
		data->last_updated = jiffies;
		data->valid = true;
	}

abort:
	mutex_unlock(&data->update_lock);
	return ret;
}

static int adt7x10_fill_cache(struct device *dev)
{
	struct adt7x10_data *data = dev_get_drvdata(dev);
	int ret;
	int i;

	for (i = 1; i < ARRAY_SIZE(data->temp); i++) {
		ret = adt7x10_read_word(dev, ADT7X10_REG_TEMP[i]);
		if (ret < 0) {
			dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
				ADT7X10_REG_TEMP[i], ret);
			return ret;
		}
		data->temp[i] = ret;
	}

	ret = adt7x10_read_byte(dev, ADT7X10_T_HYST);
	if (ret < 0) {
		dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
				ADT7X10_T_HYST, ret);
		return ret;
	}
	data->hyst = ret;

	return 0;
}

static s16 ADT7X10_TEMP_TO_REG(long temp)
{
	return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
					       ADT7X10_TEMP_MAX) * 128, 1000);
}

static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg)
{
	/* in 13 bit mode, bits 0-2 are status flags - mask them out */
	if (!(data->config & ADT7X10_RESOLUTION))
		reg &= ADT7X10_T13_VALUE_MASK;
	/*
	 * temperature is stored in twos complement format, in steps of
	 * 1/128°C
	 */
	return DIV_ROUND_CLOSEST(reg * 1000, 128);
}

/*-----------------------------------------------------------------------*/

/* sysfs attributes for hwmon */

static ssize_t adt7x10_temp_show(struct device *dev,
				 struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct adt7x10_data *data = dev_get_drvdata(dev);


	if (attr->index == 0) {
		int ret;

		ret = adt7x10_update_temp(dev);
		if (ret)
			return ret;
	}

	return sprintf(buf, "%d\n", ADT7X10_REG_TO_TEMP(data,
		       data->temp[attr->index]));
}

static ssize_t adt7x10_temp_store(struct device *dev,
				  struct device_attribute *da,
				  const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct adt7x10_data *data = dev_get_drvdata(dev);
	int nr = attr->index;
	long temp;
	int ret;

	ret = kstrtol(buf, 10, &temp);
	if (ret)
		return ret;

	mutex_lock(&data->update_lock);
	data->temp[nr] = ADT7X10_TEMP_TO_REG(temp);
	ret = adt7x10_write_word(dev, ADT7X10_REG_TEMP[nr], data->temp[nr]);
	if (ret)
		count = ret;
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t adt7x10_t_hyst_show(struct device *dev,
				   struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct adt7x10_data *data = dev_get_drvdata(dev);
	int nr = attr->index;
	int hyst;

	hyst = (data->hyst & ADT7X10_T_HYST_MASK) * 1000;

	/*
	 * hysteresis is stored as a 4 bit offset in the device, convert it
	 * to an absolute value
	 */
	if (nr == 2)	/* min has positive offset, others have negative */
		hyst = -hyst;
	return sprintf(buf, "%d\n",
		       ADT7X10_REG_TO_TEMP(data, data->temp[nr]) - hyst);
}

static ssize_t adt7x10_t_hyst_store(struct device *dev,
				    struct device_attribute *da,
				    const char *buf, size_t count)
{
	struct adt7x10_data *data = dev_get_drvdata(dev);
	int limit, ret;
	long hyst;

	ret = kstrtol(buf, 10, &hyst);
	if (ret)
		return ret;
	/* convert absolute hysteresis value to a 4 bit delta value */
	limit = ADT7X10_REG_TO_TEMP(data, data->temp[1]);
	hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
	data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000),
				   0, ADT7X10_T_HYST_MASK);
	ret = adt7x10_write_byte(dev, ADT7X10_T_HYST, data->hyst);
	if (ret)
		return ret;

	return count;
}

static ssize_t adt7x10_alarm_show(struct device *dev,
				  struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	int ret;

	ret = adt7x10_read_byte(dev, ADT7X10_STATUS);
	if (ret < 0)
		return ret;

	return sprintf(buf, "%d\n", !!(ret & attr->index));
}

static ssize_t name_show(struct device *dev, struct device_attribute *da,
			 char *buf)
{
	struct adt7x10_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", data->name);
}

static SENSOR_DEVICE_ATTR_RO(temp1_input, adt7x10_temp, 0);
static SENSOR_DEVICE_ATTR_RW(temp1_max, adt7x10_temp, 1);
static SENSOR_DEVICE_ATTR_RW(temp1_min, adt7x10_temp, 2);
static SENSOR_DEVICE_ATTR_RW(temp1_crit, adt7x10_temp, 3);
static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adt7x10_t_hyst, 1);
static SENSOR_DEVICE_ATTR_RO(temp1_min_hyst, adt7x10_t_hyst, 2);
static SENSOR_DEVICE_ATTR_RO(temp1_crit_hyst, adt7x10_t_hyst, 3);
static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, adt7x10_alarm,
			     ADT7X10_STAT_T_LOW);
static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adt7x10_alarm,
			     ADT7X10_STAT_T_HIGH);
static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, adt7x10_alarm,
			     ADT7X10_STAT_T_CRIT);
static DEVICE_ATTR_RO(name);

static struct attribute *adt7x10_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_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_temp1_crit_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group adt7x10_group = {
	.attrs = adt7x10_attributes,
};

int adt7x10_probe(struct device *dev, const char *name, int irq,
		  const struct adt7x10_ops *ops)
{
	struct adt7x10_data *data;
	int ret;

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

	data->ops = ops;
	data->name = name;

	dev_set_drvdata(dev, data);
	mutex_init(&data->update_lock);

	/* configure as specified */
	ret = adt7x10_read_byte(dev, ADT7X10_CONFIG);
	if (ret < 0) {
		dev_dbg(dev, "Can't read config? %d\n", ret);
		return ret;
	}
	data->oldconfig = ret;

	/*
	 * Set to 16 bit resolution, continous conversion and comparator mode.
	 */
	data->config = data->oldconfig;
	data->config &= ~(ADT7X10_MODE_MASK | ADT7X10_CT_POLARITY |
			ADT7X10_INT_POLARITY);
	data->config |= ADT7X10_FULL | ADT7X10_RESOLUTION | ADT7X10_EVENT_MODE;

	if (data->config != data->oldconfig) {
		ret = adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
		if (ret)
			return ret;
	}
	dev_dbg(dev, "Config %02x\n", data->config);

	ret = adt7x10_fill_cache(dev);
	if (ret)
		goto exit_restore;

	/* Register sysfs hooks */
	ret = sysfs_create_group(&dev->kobj, &adt7x10_group);
	if (ret)
		goto exit_restore;

	/*
	 * The I2C device will already have it's own 'name' attribute, but for
	 * the SPI device we need to register it. name will only be non NULL if
	 * the device doesn't register the 'name' attribute on its own.
	 */
	if (name) {
		ret = device_create_file(dev, &dev_attr_name);
		if (ret)
			goto exit_remove;
	}

	data->hwmon_dev = hwmon_device_register(dev);
	if (IS_ERR(data->hwmon_dev)) {
		ret = PTR_ERR(data->hwmon_dev);
		goto exit_remove_name;
	}

	if (irq > 0) {
		ret = request_threaded_irq(irq, NULL, adt7x10_irq_handler,
				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
				dev_name(dev), dev);
		if (ret)
			goto exit_hwmon_device_unregister;
	}

	return 0;

exit_hwmon_device_unregister:
	hwmon_device_unregister(data->hwmon_dev);
exit_remove_name:
	if (name)
		device_remove_file(dev, &dev_attr_name);
exit_remove:
	sysfs_remove_group(&dev->kobj, &adt7x10_group);
exit_restore:
	adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
	return ret;
}
EXPORT_SYMBOL_GPL(adt7x10_probe);

int adt7x10_remove(struct device *dev, int irq)
{
	struct adt7x10_data *data = dev_get_drvdata(dev);

	if (irq > 0)
		free_irq(irq, dev);

	hwmon_device_unregister(data->hwmon_dev);
	if (data->name)
		device_remove_file(dev, &dev_attr_name);
	sysfs_remove_group(&dev->kobj, &adt7x10_group);
	if (data->oldconfig != data->config)
		adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
	return 0;
}
EXPORT_SYMBOL_GPL(adt7x10_remove);

#ifdef CONFIG_PM_SLEEP

static int adt7x10_suspend(struct device *dev)
{
	struct adt7x10_data *data = dev_get_drvdata(dev);

	return adt7x10_write_byte(dev, ADT7X10_CONFIG,
		data->config | ADT7X10_PD);
}

static int adt7x10_resume(struct device *dev)
{
	struct adt7x10_data *data = dev_get_drvdata(dev);

	return adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
}

SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
EXPORT_SYMBOL_GPL(adt7x10_dev_pm_ops);

#endif /* CONFIG_PM_SLEEP */

MODULE_AUTHOR("Hartmut Knaack");
MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
MODULE_LICENSE("GPL");
Commit	Line	Data
74ba9207	1	// SPDX-License-Identifier: GPL-2.0-or-later
51c2a487 LPC	2	/*
	3	* adt7x10.c - Part of lm_sensors, Linux kernel modules for hardware
	4	* monitoring
	5	* This driver handles the ADT7410 and compatible digital temperature sensors.
	6	* Hartmut Knaack <knaack.h@gmx.de> 2012-07-22
	7	* based on lm75.c by Frodo Looijaard <frodol@dds.nl>
	8	* and adt7410.c from iio-staging by Sonic Zhang <sonic.zhang@analog.com>
51c2a487 LPC	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/init.h>
	13	#include <linux/slab.h>
	14	#include <linux/jiffies.h>
	15	#include <linux/hwmon.h>
	16	#include <linux/hwmon-sysfs.h>
	17	#include <linux/err.h>
	18	#include <linux/mutex.h>
	19	#include <linux/delay.h>
4b5e536b	20	#include <linux/interrupt.h>
51c2a487 LPC	21
	22	#include "adt7x10.h"
	23
	24	/*
	25	* ADT7X10 status
	26	*/
	27	#define ADT7X10_STAT_T_LOW (1 << 4)
	28	#define ADT7X10_STAT_T_HIGH (1 << 5)
	29	#define ADT7X10_STAT_T_CRIT (1 << 6)
	30	#define ADT7X10_STAT_NOT_RDY (1 << 7)
	31
	32	/*
	33	* ADT7X10 config
	34	*/
	35	#define ADT7X10_FAULT_QUEUE_MASK (1 << 0 \| 1 << 1)
	36	#define ADT7X10_CT_POLARITY (1 << 2)
	37	#define ADT7X10_INT_POLARITY (1 << 3)
	38	#define ADT7X10_EVENT_MODE (1 << 4)
	39	#define ADT7X10_MODE_MASK (1 << 5 \| 1 << 6)
	40	#define ADT7X10_FULL (0 << 5 \| 0 << 6)
	41	#define ADT7X10_PD (1 << 5 \| 1 << 6)
	42	#define ADT7X10_RESOLUTION (1 << 7)
	43
	44	/*
	45	* ADT7X10 masks
	46	*/
	47	#define ADT7X10_T13_VALUE_MASK 0xFFF8
	48	#define ADT7X10_T_HYST_MASK 0xF
	49
	50	/* straight from the datasheet */
	51	#define ADT7X10_TEMP_MIN (-55000)
	52	#define ADT7X10_TEMP_MAX 150000
	53
	54	/* Each client has this additional data */
	55	struct adt7x10_data {
	56	const struct adt7x10_ops *ops;
	57	const char *name;
	58	struct device *hwmon_dev;
	59	struct mutex update_lock;
	60	u8 config;
	61	u8 oldconfig;
	62	bool valid; /* true if registers valid */
	63	unsigned long last_updated; /* In jiffies */
	64	s16 temp[4]; /* Register values,
	65	0 = input
	66	1 = high
	67	2 = low
	68	3 = critical */
	69	u8 hyst; /* hysteresis offset */
	70	};
	71
	72	static int adt7x10_read_byte(struct device *dev, u8 reg)
	73	{
	74	struct adt7x10_data *d = dev_get_drvdata(dev);
	75	return d->ops->read_byte(dev, reg);
	76	}
	77
	78	static int adt7x10_write_byte(struct device *dev, u8 reg, u8 data)
	79	{
	80	struct adt7x10_data *d = dev_get_drvdata(dev);
	81	return d->ops->write_byte(dev, reg, data);
	82	}
	83
	84	static int adt7x10_read_word(struct device *dev, u8 reg)
85	{
86	struct adt7x10_data *d = dev_get_drvdata(dev);
87	return d->ops->read_word(dev, reg);
88	}
89
90	static int adt7x10_write_word(struct device *dev, u8 reg, u16 data)
91	{
92	struct adt7x10_data *d = dev_get_drvdata(dev);
93	return d->ops->write_word(dev, reg, data);
94	}
95
96	static const u8 ADT7X10_REG_TEMP[4] = {
97	ADT7X10_TEMPERATURE, /* input */
98	ADT7X10_T_ALARM_HIGH, /* high */
99	ADT7X10_T_ALARM_LOW, /* low */
100	ADT7X10_T_CRIT, /* critical */
101	};
102
4b5e536b LPC	103	static irqreturn_t adt7x10_irq_handler(int irq, void *private)
	104	{
	105	struct device *dev = private;
	106	int status;
	107
	108	status = adt7x10_read_byte(dev, ADT7X10_STATUS);
	109	if (status < 0)
	110	return IRQ_HANDLED;
	111
	112	if (status & ADT7X10_STAT_T_HIGH)
	113	sysfs_notify(&dev->kobj, NULL, "temp1_max_alarm");
	114	if (status & ADT7X10_STAT_T_LOW)
	115	sysfs_notify(&dev->kobj, NULL, "temp1_min_alarm");
	116	if (status & ADT7X10_STAT_T_CRIT)
	117	sysfs_notify(&dev->kobj, NULL, "temp1_crit_alarm");
	118
	119	return IRQ_HANDLED;
	120	}
	121
51c2a487 LPC	122	static int adt7x10_temp_ready(struct device *dev)
	123	{
	124	int i, status;
	125
	126	for (i = 0; i < 6; i++) {
	127	status = adt7x10_read_byte(dev, ADT7X10_STATUS);
	128	if (status < 0)
	129	return status;
	130	if (!(status & ADT7X10_STAT_NOT_RDY))
	131	return 0;
	132	msleep(60);
	133	}
	134	return -ETIMEDOUT;
	135	}
	136
	137	static int adt7x10_update_temp(struct device *dev)
	138	{
	139	struct adt7x10_data *data = dev_get_drvdata(dev);
	140	int ret = 0;
	141
	142	mutex_lock(&data->update_lock);
	143
	144	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	145	\|\| !data->valid) {
	146	int temp;
	147
	148	dev_dbg(dev, "Starting update\n");
	149
	150	ret = adt7x10_temp_ready(dev); /* check for new value */
	151	if (ret)
	152	goto abort;
	153
	154	temp = adt7x10_read_word(dev, ADT7X10_REG_TEMP[0]);
	155	if (temp < 0) {
	156	ret = temp;
	157	dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
	158	ADT7X10_REG_TEMP[0], ret);
	159	goto abort;
	160	}
	161	data->temp[0] = temp;
	162	data->last_updated = jiffies;
	163	data->valid = true;
	164	}
	165
	166	abort:
	167	mutex_unlock(&data->update_lock);
	168	return ret;
	169	}
	170
	171	static int adt7x10_fill_cache(struct device *dev)
	172	{
	173	struct adt7x10_data *data = dev_get_drvdata(dev);
	174	int ret;
	175	int i;
	176
	177	for (i = 1; i < ARRAY_SIZE(data->temp); i++) {
	178	ret = adt7x10_read_word(dev, ADT7X10_REG_TEMP[i]);
	179	if (ret < 0) {
	180	dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
	181	ADT7X10_REG_TEMP[i], ret);
	182	return ret;
	183	}
	184	data->temp[i] = ret;
	185	}
186
187	ret = adt7x10_read_byte(dev, ADT7X10_T_HYST);
188	if (ret < 0) {
189	dev_dbg(dev, "Failed to read value: reg %d, error %d\n",
190	ADT7X10_T_HYST, ret);
191	return ret;
192	}
193	data->hyst = ret;
194
195	return 0;
196	}
197
198	static s16 ADT7X10_TEMP_TO_REG(long temp)
199	{
200	return DIV_ROUND_CLOSEST(clamp_val(temp, ADT7X10_TEMP_MIN,
201	ADT7X10_TEMP_MAX) * 128, 1000);
202	}
203
204	static int ADT7X10_REG_TO_TEMP(struct adt7x10_data *data, s16 reg)
205	{
206	/* in 13 bit mode, bits 0-2 are status flags - mask them out */
207	if (!(data->config & ADT7X10_RESOLUTION))
208	reg &= ADT7X10_T13_VALUE_MASK;
209	/*
210	* temperature is stored in twos complement format, in steps of
211	* 1/128°C
212	*/
213	return DIV_ROUND_CLOSEST(reg * 1000, 128);
214	}
215
216	/-----------------------------------------------------------------------/
217
218	/* sysfs attributes for hwmon */
219
f9fe9de0 GR	220	static ssize_t adt7x10_temp_show(struct device *dev,
f9fe9de0 GR	221	struct device_attribute da, char buf)
51c2a487 LPC	222	{
	223	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	224	struct adt7x10_data *data = dev_get_drvdata(dev);
	225
	226
	227	if (attr->index == 0) {
	228	int ret;
	229
	230	ret = adt7x10_update_temp(dev);
	231	if (ret)
	232	return ret;
	233	}
	234
	235	return sprintf(buf, "%d\n", ADT7X10_REG_TO_TEMP(data,
	236	data->temp[attr->index]));
	237	}
	238
f9fe9de0 GR	239	static ssize_t adt7x10_temp_store(struct device *dev,
	240	struct device_attribute *da,
	241	const char *buf, size_t count)
51c2a487 LPC	242	{
	243	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	244	struct adt7x10_data *data = dev_get_drvdata(dev);
	245	int nr = attr->index;
	246	long temp;
	247	int ret;
	248
	249	ret = kstrtol(buf, 10, &temp);
	250	if (ret)
	251	return ret;
	252
	253	mutex_lock(&data->update_lock);
	254	data->temp[nr] = ADT7X10_TEMP_TO_REG(temp);
	255	ret = adt7x10_write_word(dev, ADT7X10_REG_TEMP[nr], data->temp[nr]);
	256	if (ret)
	257	count = ret;
	258	mutex_unlock(&data->update_lock);
	259	return count;
	260	}
	261
f9fe9de0 GR	262	static ssize_t adt7x10_t_hyst_show(struct device *dev,
f9fe9de0 GR	263	struct device_attribute da, char buf)
51c2a487 LPC	264	{
	265	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	266	struct adt7x10_data *data = dev_get_drvdata(dev);
	267	int nr = attr->index;
	268	int hyst;
	269
	270	hyst = (data->hyst & ADT7X10_T_HYST_MASK) * 1000;
	271
	272	/*
	273	* hysteresis is stored as a 4 bit offset in the device, convert it
	274	* to an absolute value
	275	*/
	276	if (nr == 2) /* min has positive offset, others have negative */
	277	hyst = -hyst;
	278	return sprintf(buf, "%d\n",
	279	ADT7X10_REG_TO_TEMP(data, data->temp[nr]) - hyst);
	280	}
	281
f9fe9de0 GR	282	static ssize_t adt7x10_t_hyst_store(struct device *dev,
	283	struct device_attribute *da,
	284	const char *buf, size_t count)
51c2a487 LPC	285	{
	286	struct adt7x10_data *data = dev_get_drvdata(dev);
	287	int limit, ret;
	288	long hyst;
	289
	290	ret = kstrtol(buf, 10, &hyst);
	291	if (ret)
	292	return ret;
	293	/* convert absolute hysteresis value to a 4 bit delta value */
	294	limit = ADT7X10_REG_TO_TEMP(data, data->temp[1]);
	295	hyst = clamp_val(hyst, ADT7X10_TEMP_MIN, ADT7X10_TEMP_MAX);
	296	data->hyst = clamp_val(DIV_ROUND_CLOSEST(limit - hyst, 1000),
	297	0, ADT7X10_T_HYST_MASK);
	298	ret = adt7x10_write_byte(dev, ADT7X10_T_HYST, data->hyst);
	299	if (ret)
	300	return ret;
	301
	302	return count;
	303	}
	304
f9fe9de0 GR	305	static ssize_t adt7x10_alarm_show(struct device *dev,
f9fe9de0 GR	306	struct device_attribute da, char buf)
51c2a487 LPC	307	{
	308	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	309	int ret;
	310
	311	ret = adt7x10_read_byte(dev, ADT7X10_STATUS);
	312	if (ret < 0)
	313	return ret;
	314
	315	return sprintf(buf, "%d\n", !!(ret & attr->index));
	316	}
	317
ac8e35b2 JL	318	static ssize_t name_show(struct device dev, struct device_attribute da,
ac8e35b2 JL	319	char *buf)
51c2a487 LPC	320	{
	321	struct adt7x10_data *data = dev_get_drvdata(dev);
	322
	323	return sprintf(buf, "%s\n", data->name);
	324	}
	325
f9fe9de0 GR	326	static SENSOR_DEVICE_ATTR_RO(temp1_input, adt7x10_temp, 0);
	327	static SENSOR_DEVICE_ATTR_RW(temp1_max, adt7x10_temp, 1);
	328	static SENSOR_DEVICE_ATTR_RW(temp1_min, adt7x10_temp, 2);
	329	static SENSOR_DEVICE_ATTR_RW(temp1_crit, adt7x10_temp, 3);
	330	static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, adt7x10_t_hyst, 1);
	331	static SENSOR_DEVICE_ATTR_RO(temp1_min_hyst, adt7x10_t_hyst, 2);
	332	static SENSOR_DEVICE_ATTR_RO(temp1_crit_hyst, adt7x10_t_hyst, 3);
	333	static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, adt7x10_alarm,
	334	ADT7X10_STAT_T_LOW);
	335	static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, adt7x10_alarm,
	336	ADT7X10_STAT_T_HIGH);
	337	static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, adt7x10_alarm,
	338	ADT7X10_STAT_T_CRIT);
ac8e35b2	339	static DEVICE_ATTR_RO(name);
51c2a487 LPC	340
	341	static struct attribute *adt7x10_attributes[] = {
	342	&sensor_dev_attr_temp1_input.dev_attr.attr,
	343	&sensor_dev_attr_temp1_max.dev_attr.attr,
	344	&sensor_dev_attr_temp1_min.dev_attr.attr,
	345	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	346	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	347	&sensor_dev_attr_temp1_min_hyst.dev_attr.attr,
	348	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	349	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	350	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	351	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	352	NULL
	353	};
	354
	355	static const struct attribute_group adt7x10_group = {
	356	.attrs = adt7x10_attributes,
	357	};
	358
4b5e536b	359	int adt7x10_probe(struct device dev, const char name, int irq,
51c2a487 LPC	360	const struct adt7x10_ops *ops)
	361	{
	362	struct adt7x10_data *data;
	363	int ret;
	364
	365	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	366	if (!data)
	367	return -ENOMEM;
	368
	369	data->ops = ops;
	370	data->name = name;
	371
	372	dev_set_drvdata(dev, data);
	373	mutex_init(&data->update_lock);
	374
	375	/* configure as specified */
	376	ret = adt7x10_read_byte(dev, ADT7X10_CONFIG);
	377	if (ret < 0) {
	378	dev_dbg(dev, "Can't read config? %d\n", ret);
	379	return ret;
	380	}
	381	data->oldconfig = ret;
	382
	383	/*
	384	* Set to 16 bit resolution, continous conversion and comparator mode.
	385	*/
	386	data->config = data->oldconfig;
4b5e536b LPC	387	data->config &= ~(ADT7X10_MODE_MASK \| ADT7X10_CT_POLARITY \|
4b5e536b LPC	388	ADT7X10_INT_POLARITY);
51c2a487	389	data->config \|= ADT7X10_FULL \| ADT7X10_RESOLUTION \| ADT7X10_EVENT_MODE;
4b5e536b	390
51c2a487 LPC	391	if (data->config != data->oldconfig) {
	392	ret = adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
	393	if (ret)
	394	return ret;
	395	}
	396	dev_dbg(dev, "Config %02x\n", data->config);
	397
	398	ret = adt7x10_fill_cache(dev);
	399	if (ret)
	400	goto exit_restore;
	401
	402	/* Register sysfs hooks */
	403	ret = sysfs_create_group(&dev->kobj, &adt7x10_group);
	404	if (ret)
	405	goto exit_restore;
	406
	407	/*
	408	* The I2C device will already have it's own 'name' attribute, but for
	409	* the SPI device we need to register it. name will only be non NULL if
	410	* the device doesn't register the 'name' attribute on its own.
	411	*/
	412	if (name) {
	413	ret = device_create_file(dev, &dev_attr_name);
	414	if (ret)
	415	goto exit_remove;
	416	}
	417
	418	data->hwmon_dev = hwmon_device_register(dev);
	419	if (IS_ERR(data->hwmon_dev)) {
	420	ret = PTR_ERR(data->hwmon_dev);
	421	goto exit_remove_name;
	422	}
	423
4b5e536b LPC	424	if (irq > 0) {
	425	ret = request_threaded_irq(irq, NULL, adt7x10_irq_handler,
	426	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	427	dev_name(dev), dev);
	428	if (ret)
	429	goto exit_hwmon_device_unregister;
	430	}
	431
51c2a487 LPC	432	return 0;
51c2a487 LPC	433
4b5e536b LPC	434	exit_hwmon_device_unregister:
4b5e536b LPC	435	hwmon_device_unregister(data->hwmon_dev);
51c2a487 LPC	436	exit_remove_name:
	437	if (name)
	438	device_remove_file(dev, &dev_attr_name);
	439	exit_remove:
	440	sysfs_remove_group(&dev->kobj, &adt7x10_group);
	441	exit_restore:
	442	adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
	443	return ret;
	444	}
	445	EXPORT_SYMBOL_GPL(adt7x10_probe);
	446
4b5e536b	447	int adt7x10_remove(struct device *dev, int irq)
51c2a487 LPC	448	{
	449	struct adt7x10_data *data = dev_get_drvdata(dev);
	450
4b5e536b LPC	451	if (irq > 0)
	452	free_irq(irq, dev);
	453
51c2a487 LPC	454	hwmon_device_unregister(data->hwmon_dev);
	455	if (data->name)
	456	device_remove_file(dev, &dev_attr_name);
	457	sysfs_remove_group(&dev->kobj, &adt7x10_group);
	458	if (data->oldconfig != data->config)
	459	adt7x10_write_byte(dev, ADT7X10_CONFIG, data->oldconfig);
	460	return 0;
	461	}
	462	EXPORT_SYMBOL_GPL(adt7x10_remove);
	463
	464	#ifdef CONFIG_PM_SLEEP
	465
	466	static int adt7x10_suspend(struct device *dev)
	467	{
	468	struct adt7x10_data *data = dev_get_drvdata(dev);
	469
	470	return adt7x10_write_byte(dev, ADT7X10_CONFIG,
	471	data->config \| ADT7X10_PD);
	472	}
	473
	474	static int adt7x10_resume(struct device *dev)
	475	{
	476	struct adt7x10_data *data = dev_get_drvdata(dev);
	477
	478	return adt7x10_write_byte(dev, ADT7X10_CONFIG, data->config);
	479	}
	480
	481	SIMPLE_DEV_PM_OPS(adt7x10_dev_pm_ops, adt7x10_suspend, adt7x10_resume);
	482	EXPORT_SYMBOL_GPL(adt7x10_dev_pm_ops);
	483
	484	#endif /* CONFIG_PM_SLEEP */
	485
	486	MODULE_AUTHOR("Hartmut Knaack");
	487	MODULE_DESCRIPTION("ADT7410/ADT7420, ADT7310/ADT7320 common code");
	488	MODULE_LICENSE("GPL");