[deliverable/linux.git] / drivers / hwmon / ds1621.c

/*
 * ds1621.c - Part of lm_sensors, Linux kernel modules for hardware
 *	      monitoring
 * Christian W. Zuckschwerdt  <zany@triq.net>  2000-11-23
 * based on lm75.c by Frodo Looijaard <frodol@dds.nl>
 * Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
 * the help of Jean Delvare <khali@linux-fr.org>
 *
 * The DS1621 device is a digital temperature/thermometer with 9-bit
 * resolution, a thermal alarm output (Tout), and user-defined minimum
 * and maximum temperature thresholds (TH and TL).
 *
 * The DS1625, DS1631, DS1721, and DS1731 are pin compatible with the DS1621
 * and similar in operation, with slight variations as noted in the device
 * datasheets (please refer to www.maximintegrated.com for specific
 * device information).
 *
 * Since the DS1621 was the first chipset supported by this driver,
 * most comments will refer to this chipset, but are actually general
 * and concern all supported chipsets, unless mentioned otherwise.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
#include <linux/kernel.h>

/* Supported devices */
enum chips { ds1621, ds1625, ds1631, ds1721, ds1731 };

/* Insmod parameters */
static int polarity = -1;
module_param(polarity, int, 0);
MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low");

/*
 * The Configuration/Status register
 *
 * - DS1621:
 *   7    6    5    4    3    2    1    0
 * |Done|THF |TLF |NVB | X  | X  |POL |1SHOT|
 *
 * - DS1625:
 *   7    6    5    4    3    2    1    0
 * |Done|THF |TLF |NVB | 1  | 0  |POL |1SHOT|
 *
 * - DS1631, DS1731:
 *   7    6    5    4    3    2    1    0
 * |Done|THF |TLF |NVB | R1 | R0 |POL |1SHOT|
 *
 * - DS1721:
 *   7    6    5    4    3    2    1    0
 * |Done| X  | X  | U  | R1 | R0 |POL |1SHOT|
 *
 * Where:
 * - 'X' is Reserved
 * - 'U' is Undefined
 */
#define DS1621_REG_CONFIG_NVB		0x10
#define DS1621_REG_CONFIG_RESOL		0x0C
#define DS1621_REG_CONFIG_POLARITY	0x02
#define DS1621_REG_CONFIG_1SHOT		0x01
#define DS1621_REG_CONFIG_DONE		0x80

#define DS1621_REG_CONFIG_RESOL_SHIFT	2

/* ds1721 conversion rates: {C/LSB, time(ms), resolution bit setting} */
static const unsigned short ds1721_convrates[] = {
	94,	/*  9-bits (0.5,  93.75, RES[0..1] = 0 */
	188,	/* 10-bits (0.25, 187.5, RES[0..1] = 1 */
	375,	/* 11-bits (0.125,  375, RES[0..1] = 2 */
	750,	/* 12-bits (0.0625, 750, RES[0..1] = 3 */
};

#define DS1621_CONVERSION_MAX	750
#define DS1625_CONVERSION_MAX	500

#define DS1621_TEMP_MAX	125000
#define DS1621_TEMP_MIN	(-55000)

/* The DS1621 temperature registers */
static const u8 DS1621_REG_TEMP[3] = {
	0xAA,		/* input, word, RO */
	0xA2,		/* min, word, RW */
	0xA1,		/* max, word, RW */
};
#define DS1621_REG_CONF			0xAC /* byte, RW */
#define DS1621_COM_START		0xEE /* no data */
#define DS1721_COM_START		0x51 /* no data */
#define DS1621_COM_STOP			0x22 /* no data */

/* The DS1621 configuration register */
#define DS1621_ALARM_TEMP_HIGH		0x40
#define DS1621_ALARM_TEMP_LOW		0x20

/* Conversions */
#define ALARMS_FROM_REG(val) ((val) & \
			(DS1621_ALARM_TEMP_HIGH | DS1621_ALARM_TEMP_LOW))

/* Each client has this additional data */
struct ds1621_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid;			/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */
	enum chips kind;		/* device type */

	u16 temp[3];			/* Register values, word */
	u8 conf;			/* Register encoding, combined */
	u8 zbits;			/* Resolution encoded as number of
					 * zero bits */
	u16 update_interval;		/* Conversion rate in milliseconds */
};

static inline int DS1621_TEMP_FROM_REG(u16 reg)
{
	return DIV_ROUND_CLOSEST(((s16)reg / 16) * 625, 10);
}

/*
 * TEMP: 0.001C/bit (-55C to +125C)
 * REG:
 *  - 1621, 1625: 0.5C/bit, 7 zero-bits
 *  - 1631, 1721, 1731: 0.0625C/bit, 4 zero-bits
 */
static inline u16 DS1621_TEMP_TO_REG(long temp, u8 zbits)
{
	temp = clamp_val(temp, DS1621_TEMP_MIN, DS1621_TEMP_MAX);
	temp = DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
	return temp;
}

static void ds1621_init_client(struct i2c_client *client)
{
	u8 conf, new_conf, sreg, resol;
	struct ds1621_data *data = i2c_get_clientdata(client);

	new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
	/* switch to continuous conversion mode */
	new_conf &= ~DS1621_REG_CONFIG_1SHOT;

	/* setup output polarity */
	if (polarity == 0)
		new_conf &= ~DS1621_REG_CONFIG_POLARITY;
	else if (polarity == 1)
		new_conf |= DS1621_REG_CONFIG_POLARITY;

	if (conf != new_conf)
		i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf);

	switch (data->kind) {
	case ds1625:
		data->update_interval = DS1625_CONVERSION_MAX;
		data->zbits = 7;
		sreg = DS1621_COM_START;
		break;
	case ds1631:
	case ds1721:
	case ds1731:
		resol = (new_conf & DS1621_REG_CONFIG_RESOL) >>
			 DS1621_REG_CONFIG_RESOL_SHIFT;
		data->update_interval = ds1721_convrates[resol];
		data->zbits = 7 - resol;
		sreg = DS1721_COM_START;
		break;
	default:
		data->update_interval = DS1621_CONVERSION_MAX;
		data->zbits = 7;
		sreg = DS1621_COM_START;
		break;
	}

	/* start conversion */
	i2c_smbus_write_byte(client, sreg);
}

static struct ds1621_data *ds1621_update_client(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ds1621_data *data = i2c_get_clientdata(client);
	u8 new_conf;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + data->update_interval) ||
	    !data->valid) {
		int i;

		dev_dbg(&client->dev, "Starting ds1621 update\n");

		data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);

		for (i = 0; i < ARRAY_SIZE(data->temp); i++)
			data->temp[i] = i2c_smbus_read_word_swapped(client,
							 DS1621_REG_TEMP[i]);

		/* reset alarms if necessary */
		new_conf = data->conf;
		if (data->temp[0] > data->temp[1])	/* input > min */
			new_conf &= ~DS1621_ALARM_TEMP_LOW;
		if (data->temp[0] < data->temp[2])	/* input < max */
			new_conf &= ~DS1621_ALARM_TEMP_HIGH;
		if (data->conf != new_conf)
			i2c_smbus_write_byte_data(client, DS1621_REG_CONF,
						  new_conf);

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static ssize_t show_temp(struct device *dev, struct device_attribute *da,
			 char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct ds1621_data *data = ds1621_update_client(dev);
	return sprintf(buf, "%d\n",
		       DS1621_TEMP_FROM_REG(data->temp[attr->index]));
}

static ssize_t set_temp(struct device *dev, struct device_attribute *da,
			const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct i2c_client *client = to_i2c_client(dev);
	struct ds1621_data *data = i2c_get_clientdata(client);
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	data->temp[attr->index] = DS1621_TEMP_TO_REG(val, data->zbits);
	i2c_smbus_write_word_swapped(client, DS1621_REG_TEMP[attr->index],
				     data->temp[attr->index]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t show_alarms(struct device *dev, struct device_attribute *da,
			   char *buf)
{
	struct ds1621_data *data = ds1621_update_client(dev);
	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *da,
			  char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct ds1621_data *data = ds1621_update_client(dev);
	return sprintf(buf, "%d\n", !!(data->conf & attr->index));
}

static ssize_t show_convrate(struct device *dev, struct device_attribute *da,
			  char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ds1621_data *data = i2c_get_clientdata(client);
	return scnprintf(buf, PAGE_SIZE, "%hu\n", data->update_interval);
}

static ssize_t set_convrate(struct device *dev, struct device_attribute *da,
			    const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct ds1621_data *data = i2c_get_clientdata(client);
	unsigned long convrate;
	s32 err;
	int resol = 0;

	err = kstrtoul(buf, 10, &convrate);
	if (err)
		return err;

	/* Convert rate into resolution bits */
	while (resol < (ARRAY_SIZE(ds1721_convrates) - 1) &&
	       convrate > ds1721_convrates[resol])
		resol++;

	mutex_lock(&data->update_lock);
	data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
	data->conf &= ~DS1621_REG_CONFIG_RESOL;
	data->conf |= (resol << DS1621_REG_CONFIG_RESOL_SHIFT);
	i2c_smbus_write_byte_data(client, DS1621_REG_CONF, data->conf);
	data->update_interval = ds1721_convrates[resol];
	mutex_unlock(&data->update_lock);

	return count;
}

static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_convrate,
		   set_convrate);

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR | S_IRUGO, show_temp, set_temp, 1);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp, set_temp, 2);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
		DS1621_ALARM_TEMP_LOW);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
		DS1621_ALARM_TEMP_HIGH);

static struct attribute *ds1621_attributes[] = {
	&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_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&dev_attr_alarms.attr,
	&dev_attr_update_interval.attr,
	NULL
};

static umode_t ds1621_attribute_visible(struct kobject *kobj,
					struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct i2c_client *client = to_i2c_client(dev);
	struct ds1621_data *data = i2c_get_clientdata(client);

	if (attr == &dev_attr_update_interval.attr)
		if (data->kind == ds1621 || data->kind == ds1625)
			/* shhh, we're hiding update_interval */
			return 0;
	return attr->mode;
}

static const struct attribute_group ds1621_group = {
	.attrs = ds1621_attributes,
	.is_visible = ds1621_attribute_visible
};

static int ds1621_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	struct ds1621_data *data;
	int err;

	data = devm_kzalloc(&client->dev, sizeof(struct ds1621_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	i2c_set_clientdata(client, data);
	mutex_init(&data->update_lock);

	data->kind = id->driver_data;

	/* Initialize the DS1621 chip */
	ds1621_init_client(client);

	/* Register sysfs hooks */
	err = sysfs_create_group(&client->dev.kobj, &ds1621_group);
	if (err)
		return err;

	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove_files;
	}

	return 0;

 exit_remove_files:
	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
	return err;
}

static int ds1621_remove(struct i2c_client *client)
{
	struct ds1621_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &ds1621_group);

	return 0;
}

static const struct i2c_device_id ds1621_id[] = {
	{ "ds1621", ds1621 },
	{ "ds1625", ds1625 },
	{ "ds1631", ds1631 },
	{ "ds1721", ds1721 },
	{ "ds1731", ds1731 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ds1621_id);

/* This is the driver that will be inserted */
static struct i2c_driver ds1621_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "ds1621",
	},
	.probe		= ds1621_probe,
	.remove		= ds1621_remove,
	.id_table	= ds1621_id,
};

module_i2c_driver(ds1621_driver);

MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
MODULE_DESCRIPTION("DS1621 driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4	1	/*
19f2c059 GR	2	* ds1621.c - Part of lm_sensors, Linux kernel modules for hardware
	3	* monitoring
	4	* Christian W. Zuckschwerdt <zany@triq.net> 2000-11-23
	5	* based on lm75.c by Frodo Looijaard <frodol@dds.nl>
	6	* Ported to Linux 2.6 by Aurelien Jarno <aurelien@aurel32.net> with
	7	* the help of Jean Delvare <khali@linux-fr.org>
	8	*
cd6c8a42 RC	9	* The DS1621 device is a digital temperature/thermometer with 9-bit
	10	* resolution, a thermal alarm output (Tout), and user-defined minimum
	11	* and maximum temperature thresholds (TH and TL).
	12	*
260f81ff RC	13	* The DS1625, DS1631, DS1721, and DS1731 are pin compatible with the DS1621
260f81ff RC	14	* and similar in operation, with slight variations as noted in the device
cd6c8a42 RC	15	* datasheets (please refer to www.maximintegrated.com for specific
	16	* device information).
	17	*
	18	* Since the DS1621 was the first chipset supported by this driver,
	19	* most comments will refer to this chipset, but are actually general
	20	* and concern all supported chipsets, unless mentioned otherwise.
	21	*
19f2c059 GR	22	* This program is free software; you can redistribute it and/or modify
	23	* it under the terms of the GNU General Public License as published by
	24	* the Free Software Foundation; either version 2 of the License, or
	25	* (at your option) any later version.
	26	*
	27	* This program is distributed in the hope that it will be useful,
	28	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	29	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	30	* GNU General Public License for more details.
	31	*
	32	* You should have received a copy of the GNU General Public License
	33	* along with this program; if not, write to the Free Software
	34	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	35	*/
1da177e4 LT	36
	37	#include <linux/module.h>
	38	#include <linux/init.h>
	39	#include <linux/slab.h>
	40	#include <linux/jiffies.h>
	41	#include <linux/i2c.h>
943b0830	42	#include <linux/hwmon.h>
46a2e71c	43	#include <linux/hwmon-sysfs.h>
943b0830	44	#include <linux/err.h>
9a61bf63	45	#include <linux/mutex.h>
a5ebe668	46	#include <linux/sysfs.h>
cd6c8a42	47	#include <linux/kernel.h>
1da177e4	48
cd6c8a42	49	/* Supported devices */
260f81ff	50	enum chips { ds1621, ds1625, ds1631, ds1721, ds1731 };
cd6c8a42	51
1da177e4	52	/* Insmod parameters */
1da177e4 LT	53	static int polarity = -1;
	54	module_param(polarity, int, 0);
	55	MODULE_PARM_DESC(polarity, "Output's polarity: 0 = active high, 1 = active low");
	56
cd6c8a42 RC	57	/*
	58	* The Configuration/Status register
	59	*
	60	* - DS1621:
	61	* 7 6 5 4 3 2 1 0
	62	* \|Done\|THF \|TLF \|NVB \| X \| X \|POL \|1SHOT\|
	63	*
	64	* - DS1625:
	65	* 7 6 5 4 3 2 1 0
	66	* \|Done\|THF \|TLF \|NVB \| 1 \| 0 \|POL \|1SHOT\|
	67	*
260f81ff	68	* - DS1631, DS1731:
79c1cc1c RC	69	* 7 6 5 4 3 2 1 0
	70	* \|Done\|THF \|TLF \|NVB \| R1 \| R0 \|POL \|1SHOT\|
	71	*
cd6c8a42 RC	72	* - DS1721:
	73	* 7 6 5 4 3 2 1 0
	74	* \|Done\| X \| X \| U \| R1 \| R0 \|POL \|1SHOT\|
	75	*
	76	* Where:
	77	* - 'X' is Reserved
	78	* - 'U' is Undefined
	79	*/
1da177e4	80	#define DS1621_REG_CONFIG_NVB 0x10
cd6c8a42	81	#define DS1621_REG_CONFIG_RESOL 0x0C
1da177e4 LT	82	#define DS1621_REG_CONFIG_POLARITY 0x02
	83	#define DS1621_REG_CONFIG_1SHOT 0x01
	84	#define DS1621_REG_CONFIG_DONE 0x80
	85
cd6c8a42 RC	86	#define DS1621_REG_CONFIG_RESOL_SHIFT 2
	87
	88	/* ds1721 conversion rates: {C/LSB, time(ms), resolution bit setting} */
	89	static const unsigned short ds1721_convrates[] = {
	90	94, /* 9-bits (0.5, 93.75, RES[0..1] = 0 */
	91	188, /* 10-bits (0.25, 187.5, RES[0..1] = 1 */
	92	375, /* 11-bits (0.125, 375, RES[0..1] = 2 */
	93	750, /* 12-bits (0.0625, 750, RES[0..1] = 3 */
	94	};
	95
	96	#define DS1621_CONVERSION_MAX 750
	97	#define DS1625_CONVERSION_MAX 500
	98
	99	#define DS1621_TEMP_MAX 125000
	100	#define DS1621_TEMP_MIN (-55000)
	101
	102	/* The DS1621 temperature registers */
46a2e71c JD	103	static const u8 DS1621_REG_TEMP[3] = {
	104	0xAA, /* input, word, RO */
	105	0xA2, /* min, word, RW */
	106	0xA1, /* max, word, RW */
	107	};
1da177e4 LT	108	#define DS1621_REG_CONF 0xAC /* byte, RW */
1da177e4 LT	109	#define DS1621_COM_START 0xEE /* no data */
cd6c8a42	110	#define DS1721_COM_START 0x51 /* no data */
1da177e4 LT	111	#define DS1621_COM_STOP 0x22 /* no data */
	112
	113	/* The DS1621 configuration register */
	114	#define DS1621_ALARM_TEMP_HIGH 0x40
	115	#define DS1621_ALARM_TEMP_LOW 0x20
	116
75819f01	117	/* Conversions */
1da177e4	118	#define ALARMS_FROM_REG(val) ((val) & \
19f2c059	119	(DS1621_ALARM_TEMP_HIGH \| DS1621_ALARM_TEMP_LOW))
1da177e4 LT	120
	121	/* Each client has this additional data */
	122	struct ds1621_data {
1beeffe4	123	struct device *hwmon_dev;
9a61bf63	124	struct mutex update_lock;
1da177e4 LT	125	char valid; /* !=0 if following fields are valid */
1da177e4 LT	126	unsigned long last_updated; /* In jiffies */
cd6c8a42	127	enum chips kind; /* device type */
1da177e4	128
46a2e71c	129	u16 temp[3]; /* Register values, word */
1da177e4	130	u8 conf; /* Register encoding, combined */
a50d9a4d GR	131	u8 zbits; /* Resolution encoded as number of
a50d9a4d GR	132	* zero bits */
cd6c8a42	133	u16 update_interval; /* Conversion rate in milliseconds */
1da177e4 LT	134	};
1da177e4 LT	135
cd6c8a42 RC	136	static inline int DS1621_TEMP_FROM_REG(u16 reg)
	137	{
	138	return DIV_ROUND_CLOSEST(((s16)reg / 16) * 625, 10);
	139	}
	140
	141	/*
	142	* TEMP: 0.001C/bit (-55C to +125C)
	143	* REG:
a50d9a4d GR	144	* - 1621, 1625: 0.5C/bit, 7 zero-bits
a50d9a4d GR	145	* - 1631, 1721, 1731: 0.0625C/bit, 4 zero-bits
cd6c8a42	146	*/
a50d9a4d	147	static inline u16 DS1621_TEMP_TO_REG(long temp, u8 zbits)
cd6c8a42	148	{
a50d9a4d GR	149	temp = clamp_val(temp, DS1621_TEMP_MIN, DS1621_TEMP_MAX);
	150	temp = DIV_ROUND_CLOSEST(temp * (1 << (8 - zbits)), 1000) << zbits;
	151	return temp;
cd6c8a42 RC	152	}
cd6c8a42 RC	153
1da177e4 LT	154	static void ds1621_init_client(struct i2c_client *client)
1da177e4 LT	155	{
cd6c8a42 RC	156	u8 conf, new_conf, sreg, resol;
cd6c8a42 RC	157	struct ds1621_data *data = i2c_get_clientdata(client);
e4879e28 JD	158
e4879e28 JD	159	new_conf = conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
44bbe87e	160	/* switch to continuous conversion mode */
e4879e28	161	new_conf &= ~DS1621_REG_CONFIG_1SHOT;
1da177e4 LT	162
	163	/* setup output polarity */
	164	if (polarity == 0)
e4879e28	165	new_conf &= ~DS1621_REG_CONFIG_POLARITY;
1da177e4	166	else if (polarity == 1)
e4879e28	167	new_conf \|= DS1621_REG_CONFIG_POLARITY;
19f2c059	168
e4879e28 JD	169	if (conf != new_conf)
e4879e28 JD	170	i2c_smbus_write_byte_data(client, DS1621_REG_CONF, new_conf);
19f2c059	171
cd6c8a42 RC	172	switch (data->kind) {
	173	case ds1625:
	174	data->update_interval = DS1625_CONVERSION_MAX;
a50d9a4d	175	data->zbits = 7;
cd6c8a42 RC	176	sreg = DS1621_COM_START;
cd6c8a42 RC	177	break;
79c1cc1c	178	case ds1631:
cd6c8a42	179	case ds1721:
260f81ff	180	case ds1731:
cd6c8a42 RC	181	resol = (new_conf & DS1621_REG_CONFIG_RESOL) >>
	182	DS1621_REG_CONFIG_RESOL_SHIFT;
	183	data->update_interval = ds1721_convrates[resol];
a50d9a4d	184	data->zbits = 7 - resol;
cd6c8a42 RC	185	sreg = DS1721_COM_START;
	186	break;
	187	default:
	188	data->update_interval = DS1621_CONVERSION_MAX;
a50d9a4d	189	data->zbits = 7;
cd6c8a42 RC	190	sreg = DS1621_COM_START;
	191	break;
	192	}
	193
1da177e4	194	/* start conversion */
cd6c8a42	195	i2c_smbus_write_byte(client, sreg);
1da177e4 LT	196	}
1da177e4 LT	197
9202add6 JD	198	static struct ds1621_data ds1621_update_client(struct device dev)
	199	{
	200	struct i2c_client *client = to_i2c_client(dev);
	201	struct ds1621_data *data = i2c_get_clientdata(client);
	202	u8 new_conf;
	203
	204	mutex_lock(&data->update_lock);
	205
cd6c8a42 RC	206	if (time_after(jiffies, data->last_updated + data->update_interval) \|\|
cd6c8a42 RC	207	!data->valid) {
9202add6 JD	208	int i;
	209
	210	dev_dbg(&client->dev, "Starting ds1621 update\n");
	211
594592dc	212	data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
9202add6 JD	213
9202add6 JD	214	for (i = 0; i < ARRAY_SIZE(data->temp); i++)
90f4102c	215	data->temp[i] = i2c_smbus_read_word_swapped(client,
594592dc	216	DS1621_REG_TEMP[i]);
9202add6 JD	217
	218	/* reset alarms if necessary */
	219	new_conf = data->conf;
	220	if (data->temp[0] > data->temp[1]) /* input > min */
	221	new_conf &= ~DS1621_ALARM_TEMP_LOW;
	222	if (data->temp[0] < data->temp[2]) /* input < max */
	223	new_conf &= ~DS1621_ALARM_TEMP_HIGH;
	224	if (data->conf != new_conf)
594592dc JD	225	i2c_smbus_write_byte_data(client, DS1621_REG_CONF,
594592dc JD	226	new_conf);
9202add6 JD	227
	228	data->last_updated = jiffies;
	229	data->valid = 1;
	230	}
	231
	232	mutex_unlock(&data->update_lock);
	233
	234	return data;
	235	}
	236
46a2e71c JD	237	static ssize_t show_temp(struct device dev, struct device_attribute da,
	238	char *buf)
	239	{
	240	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	241	struct ds1621_data *data = ds1621_update_client(dev);
	242	return sprintf(buf, "%d\n",
cd6c8a42	243	DS1621_TEMP_FROM_REG(data->temp[attr->index]));
1da177e4 LT	244	}
1da177e4 LT	245
46a2e71c JD	246	static ssize_t set_temp(struct device dev, struct device_attribute da,
	247	const char *buf, size_t count)
	248	{
	249	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	250	struct i2c_client *client = to_i2c_client(dev);
e4879e28	251	struct ds1621_data *data = i2c_get_clientdata(client);
19f2c059 GR	252	long val;
	253	int err;
	254
	255	err = kstrtol(buf, 10, &val);
	256	if (err)
	257	return err;
1da177e4	258
46a2e71c	259	mutex_lock(&data->update_lock);
a50d9a4d	260	data->temp[attr->index] = DS1621_TEMP_TO_REG(val, data->zbits);
90f4102c JD	261	i2c_smbus_write_word_swapped(client, DS1621_REG_TEMP[attr->index],
90f4102c JD	262	data->temp[attr->index]);
46a2e71c JD	263	mutex_unlock(&data->update_lock);
	264	return count;
	265	}
1da177e4	266
46a2e71c JD	267	static ssize_t show_alarms(struct device dev, struct device_attribute da,
46a2e71c JD	268	char *buf)
1da177e4 LT	269	{
	270	struct ds1621_data *data = ds1621_update_client(dev);
	271	return sprintf(buf, "%d\n", ALARMS_FROM_REG(data->conf));
	272	}
	273
87f0f31b JD	274	static ssize_t show_alarm(struct device dev, struct device_attribute da,
	275	char *buf)
	276	{
	277	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	278	struct ds1621_data *data = ds1621_update_client(dev);
	279	return sprintf(buf, "%d\n", !!(data->conf & attr->index));
	280	}
	281
3a8fe331 RC	282	static ssize_t show_convrate(struct device dev, struct device_attribute da,
	283	char *buf)
	284	{
	285	struct i2c_client *client = to_i2c_client(dev);
	286	struct ds1621_data *data = i2c_get_clientdata(client);
	287	return scnprintf(buf, PAGE_SIZE, "%hu\n", data->update_interval);
	288	}
	289
	290	static ssize_t set_convrate(struct device dev, struct device_attribute da,
	291	const char *buf, size_t count)
	292	{
	293	struct i2c_client *client = to_i2c_client(dev);
	294	struct ds1621_data *data = i2c_get_clientdata(client);
	295	unsigned long convrate;
	296	s32 err;
	297	int resol = 0;
	298
	299	err = kstrtoul(buf, 10, &convrate);
	300	if (err)
	301	return err;
	302
	303	/* Convert rate into resolution bits */
	304	while (resol < (ARRAY_SIZE(ds1721_convrates) - 1) &&
	305	convrate > ds1721_convrates[resol])
	306	resol++;
	307
	308	mutex_lock(&data->update_lock);
	309	data->conf = i2c_smbus_read_byte_data(client, DS1621_REG_CONF);
	310	data->conf &= ~DS1621_REG_CONFIG_RESOL;
	311	data->conf \|= (resol << DS1621_REG_CONFIG_RESOL_SHIFT);
	312	i2c_smbus_write_byte_data(client, DS1621_REG_CONF, data->conf);
	313	data->update_interval = ds1721_convrates[resol];
	314	mutex_unlock(&data->update_lock);
	315
	316	return count;
	317	}
	318
1da177e4	319	static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
3a8fe331 RC	320	static DEVICE_ATTR(update_interval, S_IWUSR \| S_IRUGO, show_convrate,
	321	set_convrate);
	322
46a2e71c JD	323	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	324	static SENSOR_DEVICE_ATTR(temp1_min, S_IWUSR \| S_IRUGO, show_temp, set_temp, 1);
	325	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO, show_temp, set_temp, 2);
87f0f31b JD	326	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
	327	DS1621_ALARM_TEMP_LOW);
	328	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
	329	DS1621_ALARM_TEMP_HIGH);
1da177e4	330
a5ebe668	331	static struct attribute *ds1621_attributes[] = {
46a2e71c JD	332	&sensor_dev_attr_temp1_input.dev_attr.attr,
	333	&sensor_dev_attr_temp1_min.dev_attr.attr,
	334	&sensor_dev_attr_temp1_max.dev_attr.attr,
87f0f31b JD	335	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
87f0f31b JD	336	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
a5ebe668	337	&dev_attr_alarms.attr,
3a8fe331	338	&dev_attr_update_interval.attr,
a5ebe668 JD	339	NULL
	340	};
	341
3a8fe331 RC	342	static umode_t ds1621_attribute_visible(struct kobject *kobj,
	343	struct attribute *attr, int index)
	344	{
	345	struct device *dev = container_of(kobj, struct device, kobj);
	346	struct i2c_client *client = to_i2c_client(dev);
	347	struct ds1621_data *data = i2c_get_clientdata(client);
	348
	349	if (attr == &dev_attr_update_interval.attr)
79c1cc1c	350	if (data->kind == ds1621 \|\| data->kind == ds1625)
3a8fe331 RC	351	/* shhh, we're hiding update_interval */
	352	return 0;
	353	return attr->mode;
	354	}
	355
a5ebe668 JD	356	static const struct attribute_group ds1621_group = {
a5ebe668 JD	357	.attrs = ds1621_attributes,
3a8fe331	358	.is_visible = ds1621_attribute_visible
a5ebe668 JD	359	};
a5ebe668 JD	360
70313eab JD	361	static int ds1621_probe(struct i2c_client *client,
	362	const struct i2c_device_id *id)
	363	{
	364	struct ds1621_data *data;
	365	int err;
	366
e20b4b38 GR	367	data = devm_kzalloc(&client->dev, sizeof(struct ds1621_data),
	368	GFP_KERNEL);
	369	if (!data)
	370	return -ENOMEM;
70313eab JD	371
	372	i2c_set_clientdata(client, data);
	373	mutex_init(&data->update_lock);
1da177e4	374
cd6c8a42 RC	375	data->kind = id->driver_data;
cd6c8a42 RC	376
1da177e4	377	/* Initialize the DS1621 chip */
75819f01	378	ds1621_init_client(client);
1da177e4 LT	379
1da177e4 LT	380	/* Register sysfs hooks */
19f2c059 GR	381	err = sysfs_create_group(&client->dev.kobj, &ds1621_group);
19f2c059 GR	382	if (err)
e20b4b38	383	return err;
a5ebe668	384
1beeffe4 TJ	385	data->hwmon_dev = hwmon_device_register(&client->dev);
	386	if (IS_ERR(data->hwmon_dev)) {
	387	err = PTR_ERR(data->hwmon_dev);
a5ebe668	388	goto exit_remove_files;
943b0830 MH	389	}
943b0830 MH	390
1da177e4 LT	391	return 0;
1da177e4 LT	392
19f2c059	393	exit_remove_files:
75819f01	394	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
1da177e4 LT	395	return err;
	396	}
	397
70313eab	398	static int ds1621_remove(struct i2c_client *client)
1da177e4	399	{
943b0830	400	struct ds1621_data *data = i2c_get_clientdata(client);
1da177e4	401
1beeffe4	402	hwmon_device_unregister(data->hwmon_dev);
a5ebe668	403	sysfs_remove_group(&client->dev.kobj, &ds1621_group);
943b0830	404
1da177e4 LT	405	return 0;
	406	}
	407
9202add6	408	static const struct i2c_device_id ds1621_id[] = {
cd6c8a42 RC	409	{ "ds1621", ds1621 },
cd6c8a42 RC	410	{ "ds1625", ds1625 },
79c1cc1c	411	{ "ds1631", ds1631 },
cd6c8a42	412	{ "ds1721", ds1721 },
260f81ff	413	{ "ds1731", ds1731 },
9202add6 JD	414	{ }
	415	};
	416	MODULE_DEVICE_TABLE(i2c, ds1621_id);
1da177e4	417
9202add6 JD	418	/* This is the driver that will be inserted */
	419	static struct i2c_driver ds1621_driver = {
	420	.class = I2C_CLASS_HWMON,
	421	.driver = {
	422	.name = "ds1621",
	423	},
	424	.probe = ds1621_probe,
	425	.remove = ds1621_remove,
	426	.id_table = ds1621_id,
9202add6	427	};
1da177e4	428
f0967eea	429	module_i2c_driver(ds1621_driver);
1da177e4 LT	430
	431	MODULE_AUTHOR("Christian W. Zuckschwerdt <zany@triq.net>");
	432	MODULE_DESCRIPTION("DS1621 driver");
	433	MODULE_LICENSE("GPL");