[linux-2.6-block.git] / drivers / hwmon / lm95245.c

/*
 * Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
 *
 * The LM95245 is a sensor chip made by National Semiconductors.
 * It reports up to two temperatures (its own plus an external one).
 * Complete datasheet can be obtained from National's website at:
 *   http://www.national.com/ds.cgi/LM/LM95245.pdf
 *
 * This driver is based on lm95241.c
 *
 * 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>

#define DEVNAME "lm95245"

static const unsigned short normal_i2c[] = {
	0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };

/* LM95245 registers */
/* general registers */
#define LM95245_REG_RW_CONFIG1		0x03
#define LM95245_REG_RW_CONVERS_RATE	0x04
#define LM95245_REG_W_ONE_SHOT		0x0F

/* diode configuration */
#define LM95245_REG_RW_CONFIG2		0xBF
#define LM95245_REG_RW_REMOTE_OFFH	0x11
#define LM95245_REG_RW_REMOTE_OFFL	0x12

/* status registers */
#define LM95245_REG_R_STATUS1		0x02
#define LM95245_REG_R_STATUS2		0x33

/* limit registers */
#define LM95245_REG_RW_REMOTE_OS_LIMIT		0x07
#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT	0x20
#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT	0x19
#define LM95245_REG_RW_COMMON_HYSTERESIS	0x21

/* temperature signed */
#define LM95245_REG_R_LOCAL_TEMPH_S	0x00
#define LM95245_REG_R_LOCAL_TEMPL_S	0x30
#define LM95245_REG_R_REMOTE_TEMPH_S	0x01
#define LM95245_REG_R_REMOTE_TEMPL_S	0x10
/* temperature unsigned */
#define LM95245_REG_R_REMOTE_TEMPH_U	0x31
#define LM95245_REG_R_REMOTE_TEMPL_U	0x32

/* id registers */
#define LM95245_REG_R_MAN_ID		0xFE
#define LM95245_REG_R_CHIP_ID		0xFF

/* LM95245 specific bitfields */
#define CFG_STOP		0x40
#define CFG_REMOTE_TCRIT_MASK	0x10
#define CFG_REMOTE_OS_MASK	0x08
#define CFG_LOCAL_TCRIT_MASK	0x04
#define CFG_LOCAL_OS_MASK	0x02

#define CFG2_OS_A0		0x40
#define CFG2_DIODE_FAULT_OS	0x20
#define CFG2_DIODE_FAULT_TCRIT	0x10
#define CFG2_REMOTE_TT		0x08
#define CFG2_REMOTE_FILTER_DIS	0x00
#define CFG2_REMOTE_FILTER_EN	0x06

/* conversation rate in ms */
#define RATE_CR0063	0x00
#define RATE_CR0364	0x01
#define RATE_CR1000	0x02
#define RATE_CR2500	0x03

#define STATUS1_DIODE_FAULT	0x04
#define STATUS1_RTCRIT		0x02
#define STATUS1_LOC		0x01

#define MANUFACTURER_ID		0x01
#define DEFAULT_REVISION	0xB3

static const u8 lm95245_reg_address[] = {
	LM95245_REG_R_LOCAL_TEMPH_S,
	LM95245_REG_R_LOCAL_TEMPL_S,
	LM95245_REG_R_REMOTE_TEMPH_S,
	LM95245_REG_R_REMOTE_TEMPL_S,
	LM95245_REG_R_REMOTE_TEMPH_U,
	LM95245_REG_R_REMOTE_TEMPL_U,
	LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
	LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
	LM95245_REG_RW_COMMON_HYSTERESIS,
	LM95245_REG_R_STATUS1,
};

/* Client data (each client gets its own) */
struct lm95245_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	unsigned long last_updated;	/* in jiffies */
	unsigned long interval;	/* in msecs */
	bool valid;		/* zero until following fields are valid */
	/* registers values */
	u8 regs[ARRAY_SIZE(lm95245_reg_address)];
	u8 config1, config2;
};

/* Conversions */
static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
{
	return val_h * 1000 + val_l * 1000 / 256;
}

static int temp_from_reg_signed(u8 val_h, u8 val_l)
{
	if (val_h & 0x80)
		return (val_h - 0x100) * 1000;
	return temp_from_reg_unsigned(val_h, val_l);
}

static struct lm95245_data *lm95245_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm95245_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

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

		for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++)
			data->regs[i]
			  = i2c_smbus_read_byte_data(client,
						     lm95245_reg_address[i]);
		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static unsigned long lm95245_read_conversion_rate(struct i2c_client *client)
{
	int rate;
	unsigned long interval;

	rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE);

	switch (rate) {
	case RATE_CR0063:
		interval = 63;
		break;
	case RATE_CR0364:
		interval = 364;
		break;
	case RATE_CR1000:
		interval = 1000;
		break;
	case RATE_CR2500:
	default:
		interval = 2500;
		break;
	}

	return interval;
}

static unsigned long lm95245_set_conversion_rate(struct i2c_client *client,
			unsigned long interval)
{
	int rate;

	if (interval <= 63) {
		interval = 63;
		rate = RATE_CR0063;
	} else if (interval <= 364) {
		interval = 364;
		rate = RATE_CR0364;
	} else if (interval <= 1000) {
		interval = 1000;
		rate = RATE_CR1000;
	} else {
		interval = 2500;
		rate = RATE_CR2500;
	}

	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate);

	return interval;
}

/* Sysfs stuff */
static ssize_t show_input(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct lm95245_data *data = lm95245_update_device(dev);
	int temp;
	int index = to_sensor_dev_attr(attr)->index;

	/*
	 * Index 0 (Local temp) is always signed
	 * Index 2 (Remote temp) has both signed and unsigned data
	 * use signed calculation for remote if signed bit is set
	 */
	if (index == 0 || data->regs[index] & 0x80)
		temp = temp_from_reg_signed(data->regs[index],
			    data->regs[index + 1]);
	else
		temp = temp_from_reg_unsigned(data->regs[index + 2],
			    data->regs[index + 3]);

	return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp);
}

static ssize_t show_limit(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct lm95245_data *data = lm95245_update_device(dev);
	int index = to_sensor_dev_attr(attr)->index;

	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
			data->regs[index] * 1000);
}

static ssize_t set_limit(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm95245_data *data = i2c_get_clientdata(client);
	int index = to_sensor_dev_attr(attr)->index;
	unsigned long val;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;

	val /= 1000;

	val = clamp_val(val, 0, (index == 6 ? 127 : 255));

	mutex_lock(&data->update_lock);

	data->valid = 0;

	i2c_smbus_write_byte_data(client, lm95245_reg_address[index], val);

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_crit_hyst(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct lm95245_data *data = lm95245_update_device(dev);
	int index = to_sensor_dev_attr(attr)->index;
	int hyst = data->regs[index] - data->regs[8];

	return snprintf(buf, PAGE_SIZE - 1, "%d\n", hyst * 1000);
}

static ssize_t set_crit_hyst(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm95245_data *data = i2c_get_clientdata(client);
	int index = to_sensor_dev_attr(attr)->index;
	unsigned long val;
	int hyst, limit;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);

	limit = i2c_smbus_read_byte_data(client, lm95245_reg_address[index]);
	hyst = limit - val / 1000;
	hyst = clamp_val(hyst, 0, 31);
	data->regs[8] = hyst;

	/* shared crit hysteresis */
	i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS,
		hyst);

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_type(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm95245_data *data = i2c_get_clientdata(client);

	return snprintf(buf, PAGE_SIZE - 1,
		data->config2 & CFG2_REMOTE_TT ? "1\n" : "2\n");
}

static ssize_t set_type(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm95245_data *data = i2c_get_clientdata(client);
	unsigned long val;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;
	if (val != 1 && val != 2)
		return -EINVAL;

	mutex_lock(&data->update_lock);

	if (val == 1)
		data->config2 |= CFG2_REMOTE_TT;
	else
		data->config2 &= ~CFG2_REMOTE_TT;

	data->valid = 0;

	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2,
				  data->config2);

	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct lm95245_data *data = lm95245_update_device(dev);
	int index = to_sensor_dev_attr(attr)->index;

	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
			!!(data->regs[9] & index));
}

static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct lm95245_data *data = lm95245_update_device(dev);

	return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
}

static ssize_t set_interval(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm95245_data *data = i2c_get_clientdata(client);
	unsigned long val;

	if (kstrtoul(buf, 10, &val) < 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);

	data->interval = lm95245_set_conversion_rate(client, val);

	mutex_unlock(&data->update_lock);

	return count;
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR | S_IRUGO, show_limit,
		set_limit, 6);
static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR | S_IRUGO, show_crit_hyst,
		set_crit_hyst, 6);
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
		STATUS1_LOC);

static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR | S_IRUGO, show_limit,
		set_limit, 7);
static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR | S_IRUGO, show_crit_hyst,
		set_crit_hyst, 7);
static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
		STATUS1_RTCRIT);
static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR | S_IRUGO, show_type,
		set_type, 0);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
		STATUS1_DIODE_FAULT);

static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
		set_interval);

static struct attribute *lm95245_attributes[] = {
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_type.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&dev_attr_update_interval.attr,
	NULL
};

static const struct attribute_group lm95245_group = {
	.attrs = lm95245_attributes,
};

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm95245_detect(struct i2c_client *new_client,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	if (i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID)
			!= MANUFACTURER_ID
		|| i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID)
			!= DEFAULT_REVISION)
		return -ENODEV;

	strlcpy(info->type, DEVNAME, I2C_NAME_SIZE);
	return 0;
}

static void lm95245_init_client(struct i2c_client *client)
{
	struct lm95245_data *data = i2c_get_clientdata(client);

	data->interval = lm95245_read_conversion_rate(client);

	data->config1 = i2c_smbus_read_byte_data(client,
		LM95245_REG_RW_CONFIG1);
	data->config2 = i2c_smbus_read_byte_data(client,
		LM95245_REG_RW_CONFIG2);

	if (data->config1 & CFG_STOP) {
		/* Clear the standby bit */
		data->config1 &= ~CFG_STOP;
		i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1,
			data->config1);
	}
}

static int lm95245_probe(struct i2c_client *new_client,
			 const struct i2c_device_id *id)
{
	struct lm95245_data *data;
	int err;

	data = devm_kzalloc(&new_client->dev, sizeof(struct lm95245_data),
			    GFP_KERNEL);
	if (!data)
		return -ENOMEM;

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

	/* Initialize the LM95245 chip */
	lm95245_init_client(new_client);

	/* Register sysfs hooks */
	err = sysfs_create_group(&new_client->dev.kobj, &lm95245_group);
	if (err)
		return err;

	data->hwmon_dev = hwmon_device_register(&new_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(&new_client->dev.kobj, &lm95245_group);
	return err;
}

static int lm95245_remove(struct i2c_client *client)
{
	struct lm95245_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &lm95245_group);

	return 0;
}

/* Driver data (common to all clients) */
static const struct i2c_device_id lm95245_id[] = {
	{ DEVNAME, 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm95245_id);

static struct i2c_driver lm95245_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= DEVNAME,
	},
	.probe		= lm95245_probe,
	.remove		= lm95245_remove,
	.id_table	= lm95245_id,
	.detect		= lm95245_detect,
	.address_list	= normal_i2c,
};

module_i2c_driver(lm95245_driver);

MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
MODULE_DESCRIPTION("LM95245 sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
fffd80cc AS	1	/*
	2	* Copyright (C) 2011 Alexander Stein <alexander.stein@systec-electronic.com>
	3	*
	4	* The LM95245 is a sensor chip made by National Semiconductors.
	5	* It reports up to two temperatures (its own plus an external one).
	6	* Complete datasheet can be obtained from National's website at:
	7	* http://www.national.com/ds.cgi/LM/LM95245.pdf
	8	*
	9	* This driver is based on lm95241.c
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	24	*/
	25
	26	#include <linux/module.h>
	27	#include <linux/init.h>
	28	#include <linux/slab.h>
	29	#include <linux/jiffies.h>
	30	#include <linux/i2c.h>
	31	#include <linux/hwmon.h>
	32	#include <linux/hwmon-sysfs.h>
	33	#include <linux/err.h>
	34	#include <linux/mutex.h>
	35	#include <linux/sysfs.h>
	36
	37	#define DEVNAME "lm95245"
	38
	39	static const unsigned short normal_i2c[] = {
	40	0x18, 0x19, 0x29, 0x4c, 0x4d, I2C_CLIENT_END };
	41
	42	/* LM95245 registers */
	43	/* general registers */
	44	#define LM95245_REG_RW_CONFIG1 0x03
	45	#define LM95245_REG_RW_CONVERS_RATE 0x04
	46	#define LM95245_REG_W_ONE_SHOT 0x0F
	47
	48	/* diode configuration */
	49	#define LM95245_REG_RW_CONFIG2 0xBF
	50	#define LM95245_REG_RW_REMOTE_OFFH 0x11
	51	#define LM95245_REG_RW_REMOTE_OFFL 0x12
	52
	53	/* status registers */
	54	#define LM95245_REG_R_STATUS1 0x02
	55	#define LM95245_REG_R_STATUS2 0x33
	56
	57	/* limit registers */
	58	#define LM95245_REG_RW_REMOTE_OS_LIMIT 0x07
	59	#define LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT 0x20
	60	#define LM95245_REG_RW_REMOTE_TCRIT_LIMIT 0x19
	61	#define LM95245_REG_RW_COMMON_HYSTERESIS 0x21
	62
	63	/* temperature signed */
	64	#define LM95245_REG_R_LOCAL_TEMPH_S 0x00
65	#define LM95245_REG_R_LOCAL_TEMPL_S 0x30
66	#define LM95245_REG_R_REMOTE_TEMPH_S 0x01
67	#define LM95245_REG_R_REMOTE_TEMPL_S 0x10
68	/* temperature unsigned */
69	#define LM95245_REG_R_REMOTE_TEMPH_U 0x31
70	#define LM95245_REG_R_REMOTE_TEMPL_U 0x32
71
72	/* id registers */
73	#define LM95245_REG_R_MAN_ID 0xFE
74	#define LM95245_REG_R_CHIP_ID 0xFF
75
76	/* LM95245 specific bitfields */
77	#define CFG_STOP 0x40
78	#define CFG_REMOTE_TCRIT_MASK 0x10
79	#define CFG_REMOTE_OS_MASK 0x08
80	#define CFG_LOCAL_TCRIT_MASK 0x04
81	#define CFG_LOCAL_OS_MASK 0x02
82
83	#define CFG2_OS_A0 0x40
84	#define CFG2_DIODE_FAULT_OS 0x20
85	#define CFG2_DIODE_FAULT_TCRIT 0x10
86	#define CFG2_REMOTE_TT 0x08
87	#define CFG2_REMOTE_FILTER_DIS 0x00
88	#define CFG2_REMOTE_FILTER_EN 0x06
89
90	/* conversation rate in ms */
91	#define RATE_CR0063 0x00
92	#define RATE_CR0364 0x01
93	#define RATE_CR1000 0x02
94	#define RATE_CR2500 0x03
95
96	#define STATUS1_DIODE_FAULT 0x04
97	#define STATUS1_RTCRIT 0x02
98	#define STATUS1_LOC 0x01
99
100	#define MANUFACTURER_ID 0x01
101	#define DEFAULT_REVISION 0xB3
102
103	static const u8 lm95245_reg_address[] = {
104	LM95245_REG_R_LOCAL_TEMPH_S,
105	LM95245_REG_R_LOCAL_TEMPL_S,
106	LM95245_REG_R_REMOTE_TEMPH_S,
107	LM95245_REG_R_REMOTE_TEMPL_S,
108	LM95245_REG_R_REMOTE_TEMPH_U,
109	LM95245_REG_R_REMOTE_TEMPL_U,
110	LM95245_REG_RW_LOCAL_OS_TCRIT_LIMIT,
111	LM95245_REG_RW_REMOTE_TCRIT_LIMIT,
112	LM95245_REG_RW_COMMON_HYSTERESIS,
113	LM95245_REG_R_STATUS1,
114	};
115
116	/* Client data (each client gets its own) */
117	struct lm95245_data {
118	struct device *hwmon_dev;
119	struct mutex update_lock;
120	unsigned long last_updated; /* in jiffies */
121	unsigned long interval; /* in msecs */
122	bool valid; /* zero until following fields are valid */
123	/* registers values */
124	u8 regs[ARRAY_SIZE(lm95245_reg_address)];
125	u8 config1, config2;
126	};
127
128	/* Conversions */
129	static int temp_from_reg_unsigned(u8 val_h, u8 val_l)
130	{
131	return val_h * 1000 + val_l * 1000 / 256;
132	}
133
134	static int temp_from_reg_signed(u8 val_h, u8 val_l)
135	{
136	if (val_h & 0x80)
137	return (val_h - 0x100) * 1000;
138	return temp_from_reg_unsigned(val_h, val_l);
139	}
140
141	static struct lm95245_data lm95245_update_device(struct device dev)
142	{
143	struct i2c_client *client = to_i2c_client(dev);
144	struct lm95245_data *data = i2c_get_clientdata(client);
145
146	mutex_lock(&data->update_lock);
147
148	if (time_after(jiffies, data->last_updated
149	+ msecs_to_jiffies(data->interval)) \|\| !data->valid) {
150	int i;
151
fffd80cc AS	152	for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++)
	153	data->regs[i]
	154	= i2c_smbus_read_byte_data(client,
	155	lm95245_reg_address[i]);
	156	data->last_updated = jiffies;
	157	data->valid = 1;
	158	}
	159
	160	mutex_unlock(&data->update_lock);
	161
	162	return data;
	163	}
	164
	165	static unsigned long lm95245_read_conversion_rate(struct i2c_client *client)
	166	{
	167	int rate;
	168	unsigned long interval;
	169
	170	rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE);
	171
	172	switch (rate) {
	173	case RATE_CR0063:
	174	interval = 63;
	175	break;
	176	case RATE_CR0364:
	177	interval = 364;
	178	break;
	179	case RATE_CR1000:
	180	interval = 1000;
	181	break;
	182	case RATE_CR2500:
	183	default:
	184	interval = 2500;
	185	break;
	186	}
	187
	188	return interval;
	189	}
	190
	191	static unsigned long lm95245_set_conversion_rate(struct i2c_client *client,
	192	unsigned long interval)
	193	{
	194	int rate;
	195
	196	if (interval <= 63) {
	197	interval = 63;
	198	rate = RATE_CR0063;
	199	} else if (interval <= 364) {
	200	interval = 364;
	201	rate = RATE_CR0364;
	202	} else if (interval <= 1000) {
	203	interval = 1000;
	204	rate = RATE_CR1000;
	205	} else {
	206	interval = 2500;
	207	rate = RATE_CR2500;
	208	}
	209
	210	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate);
	211
	212	return interval;
	213	}
	214
	215	/* Sysfs stuff */
216	static ssize_t show_input(struct device dev, struct device_attribute attr,
217	char *buf)
218	{
219	struct lm95245_data *data = lm95245_update_device(dev);
220	int temp;
221	int index = to_sensor_dev_attr(attr)->index;
222
223	/*
224	* Index 0 (Local temp) is always signed
225	* Index 2 (Remote temp) has both signed and unsigned data
226	* use signed calculation for remote if signed bit is set
227	*/
228	if (index == 0 \|\| data->regs[index] & 0x80)
229	temp = temp_from_reg_signed(data->regs[index],
230	data->regs[index + 1]);
231	else
232	temp = temp_from_reg_unsigned(data->regs[index + 2],
233	data->regs[index + 3]);
234
235	return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp);
236	}
237
238	static ssize_t show_limit(struct device dev, struct device_attribute attr,
239	char *buf)
240	{
241	struct lm95245_data *data = lm95245_update_device(dev);
242	int index = to_sensor_dev_attr(attr)->index;
243
244	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
245	data->regs[index] * 1000);
246	}
247
248	static ssize_t set_limit(struct device dev, struct device_attribute attr,
249	const char *buf, size_t count)
250	{
251	struct i2c_client *client = to_i2c_client(dev);
252	struct lm95245_data *data = i2c_get_clientdata(client);
253	int index = to_sensor_dev_attr(attr)->index;
254	unsigned long val;
255
179c4fdb	256	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	257	return -EINVAL;
	258
	259	val /= 1000;
	260
2a844c14	261	val = clamp_val(val, 0, (index == 6 ? 127 : 255));
fffd80cc AS	262
	263	mutex_lock(&data->update_lock);
	264
	265	data->valid = 0;
	266
	267	i2c_smbus_write_byte_data(client, lm95245_reg_address[index], val);
	268
	269	mutex_unlock(&data->update_lock);
	270
	271	return count;
	272	}
	273
408c15ea GR	274	static ssize_t show_crit_hyst(struct device dev, struct device_attribute attr,
	275	char *buf)
	276	{
	277	struct lm95245_data *data = lm95245_update_device(dev);
	278	int index = to_sensor_dev_attr(attr)->index;
	279	int hyst = data->regs[index] - data->regs[8];
	280
	281	return snprintf(buf, PAGE_SIZE - 1, "%d\n", hyst * 1000);
	282	}
	283
fffd80cc AS	284	static ssize_t set_crit_hyst(struct device dev, struct device_attribute attr,
	285	const char *buf, size_t count)
	286	{
	287	struct i2c_client *client = to_i2c_client(dev);
	288	struct lm95245_data *data = i2c_get_clientdata(client);
408c15ea	289	int index = to_sensor_dev_attr(attr)->index;
fffd80cc	290	unsigned long val;
408c15ea	291	int hyst, limit;
fffd80cc	292
179c4fdb	293	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	294	return -EINVAL;
fffd80cc AS	295
fffd80cc AS	296	mutex_lock(&data->update_lock);
fffd80cc AS	297
408c15ea GR	298	limit = i2c_smbus_read_byte_data(client, lm95245_reg_address[index]);
	299	hyst = limit - val / 1000;
	300	hyst = clamp_val(hyst, 0, 31);
	301	data->regs[8] = hyst;
fffd80cc AS	302
	303	/* shared crit hysteresis */
	304	i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS,
408c15ea	305	hyst);
fffd80cc AS	306
	307	mutex_unlock(&data->update_lock);
	308
	309	return count;
	310	}
	311
	312	static ssize_t show_type(struct device dev, struct device_attribute attr,
	313	char *buf)
	314	{
	315	struct i2c_client *client = to_i2c_client(dev);
	316	struct lm95245_data *data = i2c_get_clientdata(client);
	317
	318	return snprintf(buf, PAGE_SIZE - 1,
	319	data->config2 & CFG2_REMOTE_TT ? "1\n" : "2\n");
	320	}
	321
	322	static ssize_t set_type(struct device dev, struct device_attribute attr,
	323	const char *buf, size_t count)
	324	{
	325	struct i2c_client *client = to_i2c_client(dev);
	326	struct lm95245_data *data = i2c_get_clientdata(client);
	327	unsigned long val;
	328
179c4fdb	329	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	330	return -EINVAL;
	331	if (val != 1 && val != 2)
	332	return -EINVAL;
	333
	334	mutex_lock(&data->update_lock);
	335
	336	if (val == 1)
	337	data->config2 \|= CFG2_REMOTE_TT;
	338	else
	339	data->config2 &= ~CFG2_REMOTE_TT;
	340
	341	data->valid = 0;
	342
	343	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2,
	344	data->config2);
	345
	346	mutex_unlock(&data->update_lock);
	347
	348	return count;
	349	}
	350
	351	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	352	char *buf)
	353	{
	354	struct lm95245_data *data = lm95245_update_device(dev);
	355	int index = to_sensor_dev_attr(attr)->index;
	356
	357	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
	358	!!(data->regs[9] & index));
	359	}
	360
	361	static ssize_t show_interval(struct device dev, struct device_attribute attr,
	362	char *buf)
	363	{
	364	struct lm95245_data *data = lm95245_update_device(dev);
	365
	366	return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
	367	}
	368
	369	static ssize_t set_interval(struct device dev, struct device_attribute attr,
	370	const char *buf, size_t count)
	371	{
	372	struct i2c_client *client = to_i2c_client(dev);
	373	struct lm95245_data *data = i2c_get_clientdata(client);
	374	unsigned long val;
	375
179c4fdb	376	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	377	return -EINVAL;
	378
	379	mutex_lock(&data->update_lock);
	380
	381	data->interval = lm95245_set_conversion_rate(client, val);
	382
	383	mutex_unlock(&data->update_lock);
	384
	385	return count;
	386	}
	387
	388	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
	389	static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR \| S_IRUGO, show_limit,
	390	set_limit, 6);
408c15ea GR	391	static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR \| S_IRUGO, show_crit_hyst,
408c15ea GR	392	set_crit_hyst, 6);
fffd80cc AS	393	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
	394	STATUS1_LOC);
	395
	396	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
	397	static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_limit,
	398	set_limit, 7);
408c15ea GR	399	static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR \| S_IRUGO, show_crit_hyst,
408c15ea GR	400	set_crit_hyst, 7);
fffd80cc AS	401	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
	402	STATUS1_RTCRIT);
	403	static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR \| S_IRUGO, show_type,
	404	set_type, 0);
	405	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
	406	STATUS1_DIODE_FAULT);
	407
	408	static DEVICE_ATTR(update_interval, S_IWUSR \| S_IRUGO, show_interval,
	409	set_interval);
	410
	411	static struct attribute *lm95245_attributes[] = {
	412	&sensor_dev_attr_temp1_input.dev_attr.attr,
	413	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	414	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	415	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	416	&sensor_dev_attr_temp2_input.dev_attr.attr,
	417	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	418	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	419	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	420	&sensor_dev_attr_temp2_type.dev_attr.attr,
	421	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	422	&dev_attr_update_interval.attr,
	423	NULL
	424	};
	425
	426	static const struct attribute_group lm95245_group = {
	427	.attrs = lm95245_attributes,
	428	};
	429
	430	/* Return 0 if detection is successful, -ENODEV otherwise */
	431	static int lm95245_detect(struct i2c_client *new_client,
	432	struct i2c_board_info *info)
	433	{
	434	struct i2c_adapter *adapter = new_client->adapter;
	435
	436	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	437	return -ENODEV;
	438
	439	if (i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID)
	440	!= MANUFACTURER_ID
	441	\|\| i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID)
	442	!= DEFAULT_REVISION)
	443	return -ENODEV;
	444
	445	strlcpy(info->type, DEVNAME, I2C_NAME_SIZE);
	446	return 0;
	447	}
	448
	449	static void lm95245_init_client(struct i2c_client *client)
	450	{
	451	struct lm95245_data *data = i2c_get_clientdata(client);
	452
fffd80cc AS	453	data->interval = lm95245_read_conversion_rate(client);
	454
	455	data->config1 = i2c_smbus_read_byte_data(client,
	456	LM95245_REG_RW_CONFIG1);
	457	data->config2 = i2c_smbus_read_byte_data(client,
	458	LM95245_REG_RW_CONFIG2);
	459
	460	if (data->config1 & CFG_STOP) {
	461	/* Clear the standby bit */
	462	data->config1 &= ~CFG_STOP;
	463	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1,
	464	data->config1);
	465	}
	466	}
	467
	468	static int lm95245_probe(struct i2c_client *new_client,
	469	const struct i2c_device_id *id)
	470	{
	471	struct lm95245_data *data;
	472	int err;
	473
a8dd946c GR	474	data = devm_kzalloc(&new_client->dev, sizeof(struct lm95245_data),
	475	GFP_KERNEL);
	476	if (!data)
	477	return -ENOMEM;
fffd80cc AS	478
	479	i2c_set_clientdata(new_client, data);
	480	mutex_init(&data->update_lock);
	481
	482	/* Initialize the LM95245 chip */
	483	lm95245_init_client(new_client);
	484
	485	/* Register sysfs hooks */
	486	err = sysfs_create_group(&new_client->dev.kobj, &lm95245_group);
	487	if (err)
a8dd946c	488	return err;
fffd80cc AS	489
	490	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	491	if (IS_ERR(data->hwmon_dev)) {
	492	err = PTR_ERR(data->hwmon_dev);
	493	goto exit_remove_files;
	494	}
	495
	496	return 0;
	497
	498	exit_remove_files:
	499	sysfs_remove_group(&new_client->dev.kobj, &lm95245_group);
fffd80cc AS	500	return err;
	501	}
	502
	503	static int lm95245_remove(struct i2c_client *client)
	504	{
	505	struct lm95245_data *data = i2c_get_clientdata(client);
	506
	507	hwmon_device_unregister(data->hwmon_dev);
	508	sysfs_remove_group(&client->dev.kobj, &lm95245_group);
	509
fffd80cc AS	510	return 0;
	511	}
	512
	513	/* Driver data (common to all clients) */
	514	static const struct i2c_device_id lm95245_id[] = {
	515	{ DEVNAME, 0 },
	516	{ }
	517	};
	518	MODULE_DEVICE_TABLE(i2c, lm95245_id);
	519
	520	static struct i2c_driver lm95245_driver = {
	521	.class = I2C_CLASS_HWMON,
	522	.driver = {
	523	.name = DEVNAME,
	524	},
	525	.probe = lm95245_probe,
	526	.remove = lm95245_remove,
	527	.id_table = lm95245_id,
	528	.detect = lm95245_detect,
	529	.address_list = normal_i2c,
	530	};
	531
f0967eea	532	module_i2c_driver(lm95245_driver);
fffd80cc AS	533
	534	MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
	535	MODULE_DESCRIPTION("LM95245 sensor driver");
	536	MODULE_LICENSE("GPL");