[GitHub/mt8127/android_kernel_alcatel_ttab.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;

		dev_dbg(&client->dev, "Updating lm95245 data.\n");
		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 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);
	unsigned long val;

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

	val /= 1000;

	val = clamp_val(val, 0, 31);

	mutex_lock(&data->update_lock);

	data->valid = 0;

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

	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_limit,
		set_crit_hyst, 8);
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_limit,
		set_crit_hyst, 8);
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->valid = 0;
	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
152	dev_dbg(&client->dev, "Updating lm95245 data.\n");
153	for (i = 0; i < ARRAY_SIZE(lm95245_reg_address); i++)
154	data->regs[i]
155	= i2c_smbus_read_byte_data(client,
156	lm95245_reg_address[i]);
157	data->last_updated = jiffies;
158	data->valid = 1;
159	}
160
161	mutex_unlock(&data->update_lock);
162
163	return data;
164	}
165
166	static unsigned long lm95245_read_conversion_rate(struct i2c_client *client)
167	{
168	int rate;
169	unsigned long interval;
170
171	rate = i2c_smbus_read_byte_data(client, LM95245_REG_RW_CONVERS_RATE);
172
173	switch (rate) {
174	case RATE_CR0063:
175	interval = 63;
176	break;
177	case RATE_CR0364:
178	interval = 364;
179	break;
180	case RATE_CR1000:
181	interval = 1000;
182	break;
183	case RATE_CR2500:
184	default:
185	interval = 2500;
186	break;
187	}
188
189	return interval;
190	}
191
192	static unsigned long lm95245_set_conversion_rate(struct i2c_client *client,
193	unsigned long interval)
194	{
195	int rate;
196
197	if (interval <= 63) {
198	interval = 63;
199	rate = RATE_CR0063;
200	} else if (interval <= 364) {
201	interval = 364;
202	rate = RATE_CR0364;
203	} else if (interval <= 1000) {
204	interval = 1000;
205	rate = RATE_CR1000;
206	} else {
207	interval = 2500;
208	rate = RATE_CR2500;
209	}
210
211	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONVERS_RATE, rate);
212
213	return interval;
214	}
215
216	/* Sysfs stuff */
217	static ssize_t show_input(struct device dev, struct device_attribute attr,
218	char *buf)
219	{
220	struct lm95245_data *data = lm95245_update_device(dev);
221	int temp;
222	int index = to_sensor_dev_attr(attr)->index;
223
224	/*
225	* Index 0 (Local temp) is always signed
226	* Index 2 (Remote temp) has both signed and unsigned data
227	* use signed calculation for remote if signed bit is set
228	*/
229	if (index == 0 \|\| data->regs[index] & 0x80)
230	temp = temp_from_reg_signed(data->regs[index],
231	data->regs[index + 1]);
232	else
233	temp = temp_from_reg_unsigned(data->regs[index + 2],
234	data->regs[index + 3]);
235
236	return snprintf(buf, PAGE_SIZE - 1, "%d\n", temp);
237	}
238
239	static ssize_t show_limit(struct device dev, struct device_attribute attr,
240	char *buf)
241	{
242	struct lm95245_data *data = lm95245_update_device(dev);
243	int index = to_sensor_dev_attr(attr)->index;
244
245	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
246	data->regs[index] * 1000);
247	}
248
249	static ssize_t set_limit(struct device dev, struct device_attribute attr,
250	const char *buf, size_t count)
251	{
252	struct i2c_client *client = to_i2c_client(dev);
253	struct lm95245_data *data = i2c_get_clientdata(client);
254	int index = to_sensor_dev_attr(attr)->index;
255	unsigned long val;
256
179c4fdb	257	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	258	return -EINVAL;
	259
	260	val /= 1000;
	261
2a844c14	262	val = clamp_val(val, 0, (index == 6 ? 127 : 255));
fffd80cc AS	263
	264	mutex_lock(&data->update_lock);
	265
	266	data->valid = 0;
	267
	268	i2c_smbus_write_byte_data(client, lm95245_reg_address[index], val);
	269
	270	mutex_unlock(&data->update_lock);
	271
	272	return count;
	273	}
	274
	275	static ssize_t set_crit_hyst(struct device dev, struct device_attribute attr,
	276	const char *buf, size_t count)
	277	{
	278	struct i2c_client *client = to_i2c_client(dev);
	279	struct lm95245_data *data = i2c_get_clientdata(client);
	280	unsigned long val;
	281
179c4fdb	282	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	283	return -EINVAL;
	284
	285	val /= 1000;
	286
2a844c14	287	val = clamp_val(val, 0, 31);
fffd80cc AS	288
	289	mutex_lock(&data->update_lock);
	290
	291	data->valid = 0;
	292
	293	/* shared crit hysteresis */
	294	i2c_smbus_write_byte_data(client, LM95245_REG_RW_COMMON_HYSTERESIS,
	295	val);
	296
	297	mutex_unlock(&data->update_lock);
	298
	299	return count;
	300	}
	301
	302	static ssize_t show_type(struct device dev, struct device_attribute attr,
	303	char *buf)
	304	{
	305	struct i2c_client *client = to_i2c_client(dev);
	306	struct lm95245_data *data = i2c_get_clientdata(client);
	307
	308	return snprintf(buf, PAGE_SIZE - 1,
	309	data->config2 & CFG2_REMOTE_TT ? "1\n" : "2\n");
	310	}
	311
	312	static ssize_t set_type(struct device dev, struct device_attribute attr,
	313	const char *buf, size_t count)
	314	{
	315	struct i2c_client *client = to_i2c_client(dev);
	316	struct lm95245_data *data = i2c_get_clientdata(client);
	317	unsigned long val;
	318
179c4fdb	319	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	320	return -EINVAL;
	321	if (val != 1 && val != 2)
	322	return -EINVAL;
	323
	324	mutex_lock(&data->update_lock);
	325
	326	if (val == 1)
	327	data->config2 \|= CFG2_REMOTE_TT;
	328	else
	329	data->config2 &= ~CFG2_REMOTE_TT;
	330
	331	data->valid = 0;
	332
	333	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG2,
	334	data->config2);
	335
	336	mutex_unlock(&data->update_lock);
	337
	338	return count;
	339	}
	340
	341	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	342	char *buf)
	343	{
	344	struct lm95245_data *data = lm95245_update_device(dev);
	345	int index = to_sensor_dev_attr(attr)->index;
	346
	347	return snprintf(buf, PAGE_SIZE - 1, "%d\n",
	348	!!(data->regs[9] & index));
	349	}
	350
	351	static ssize_t show_interval(struct device dev, struct device_attribute attr,
	352	char *buf)
	353	{
	354	struct lm95245_data *data = lm95245_update_device(dev);
	355
	356	return snprintf(buf, PAGE_SIZE - 1, "%lu\n", data->interval);
	357	}
	358
	359	static ssize_t set_interval(struct device dev, struct device_attribute attr,
	360	const char *buf, size_t count)
	361	{
	362	struct i2c_client *client = to_i2c_client(dev);
	363	struct lm95245_data *data = i2c_get_clientdata(client);
	364	unsigned long val;
	365
179c4fdb	366	if (kstrtoul(buf, 10, &val) < 0)
fffd80cc AS	367	return -EINVAL;
	368
	369	mutex_lock(&data->update_lock);
	370
	371	data->interval = lm95245_set_conversion_rate(client, val);
	372
	373	mutex_unlock(&data->update_lock);
	374
	375	return count;
	376	}
	377
	378	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_input, NULL, 0);
	379	static SENSOR_DEVICE_ATTR(temp1_crit, S_IWUSR \| S_IRUGO, show_limit,
	380	set_limit, 6);
	381	static SENSOR_DEVICE_ATTR(temp1_crit_hyst, S_IWUSR \| S_IRUGO, show_limit,
	382	set_crit_hyst, 8);
	383	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
	384	STATUS1_LOC);
	385
	386	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_input, NULL, 2);
	387	static SENSOR_DEVICE_ATTR(temp2_crit, S_IWUSR \| S_IRUGO, show_limit,
	388	set_limit, 7);
	389	static SENSOR_DEVICE_ATTR(temp2_crit_hyst, S_IWUSR \| S_IRUGO, show_limit,
	390	set_crit_hyst, 8);
	391	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL,
	392	STATUS1_RTCRIT);
	393	static SENSOR_DEVICE_ATTR(temp2_type, S_IWUSR \| S_IRUGO, show_type,
	394	set_type, 0);
	395	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL,
	396	STATUS1_DIODE_FAULT);
	397
	398	static DEVICE_ATTR(update_interval, S_IWUSR \| S_IRUGO, show_interval,
	399	set_interval);
	400
	401	static struct attribute *lm95245_attributes[] = {
	402	&sensor_dev_attr_temp1_input.dev_attr.attr,
	403	&sensor_dev_attr_temp1_crit.dev_attr.attr,
	404	&sensor_dev_attr_temp1_crit_hyst.dev_attr.attr,
	405	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
	406	&sensor_dev_attr_temp2_input.dev_attr.attr,
	407	&sensor_dev_attr_temp2_crit.dev_attr.attr,
	408	&sensor_dev_attr_temp2_crit_hyst.dev_attr.attr,
	409	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
	410	&sensor_dev_attr_temp2_type.dev_attr.attr,
	411	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	412	&dev_attr_update_interval.attr,
	413	NULL
	414	};
	415
	416	static const struct attribute_group lm95245_group = {
	417	.attrs = lm95245_attributes,
	418	};
	419
	420	/* Return 0 if detection is successful, -ENODEV otherwise */
	421	static int lm95245_detect(struct i2c_client *new_client,
	422	struct i2c_board_info *info)
	423	{
	424	struct i2c_adapter *adapter = new_client->adapter;
	425
	426	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	427	return -ENODEV;
	428
	429	if (i2c_smbus_read_byte_data(new_client, LM95245_REG_R_MAN_ID)
	430	!= MANUFACTURER_ID
431	\|\| i2c_smbus_read_byte_data(new_client, LM95245_REG_R_CHIP_ID)
432	!= DEFAULT_REVISION)
433	return -ENODEV;
434
435	strlcpy(info->type, DEVNAME, I2C_NAME_SIZE);
436	return 0;
437	}
438
439	static void lm95245_init_client(struct i2c_client *client)
440	{
441	struct lm95245_data *data = i2c_get_clientdata(client);
442
443	data->valid = 0;
444	data->interval = lm95245_read_conversion_rate(client);
445
446	data->config1 = i2c_smbus_read_byte_data(client,
447	LM95245_REG_RW_CONFIG1);
448	data->config2 = i2c_smbus_read_byte_data(client,
449	LM95245_REG_RW_CONFIG2);
450
451	if (data->config1 & CFG_STOP) {
452	/* Clear the standby bit */
453	data->config1 &= ~CFG_STOP;
454	i2c_smbus_write_byte_data(client, LM95245_REG_RW_CONFIG1,
455	data->config1);
456	}
457	}
458
459	static int lm95245_probe(struct i2c_client *new_client,
460	const struct i2c_device_id *id)
461	{
462	struct lm95245_data *data;
463	int err;
464
a8dd946c GR	465	data = devm_kzalloc(&new_client->dev, sizeof(struct lm95245_data),
	466	GFP_KERNEL);
	467	if (!data)
	468	return -ENOMEM;
fffd80cc AS	469
	470	i2c_set_clientdata(new_client, data);
	471	mutex_init(&data->update_lock);
	472
	473	/* Initialize the LM95245 chip */
	474	lm95245_init_client(new_client);
	475
	476	/* Register sysfs hooks */
	477	err = sysfs_create_group(&new_client->dev.kobj, &lm95245_group);
	478	if (err)
a8dd946c	479	return err;
fffd80cc AS	480
	481	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	482	if (IS_ERR(data->hwmon_dev)) {
	483	err = PTR_ERR(data->hwmon_dev);
	484	goto exit_remove_files;
	485	}
	486
	487	return 0;
	488
	489	exit_remove_files:
	490	sysfs_remove_group(&new_client->dev.kobj, &lm95245_group);
fffd80cc AS	491	return err;
	492	}
	493
	494	static int lm95245_remove(struct i2c_client *client)
	495	{
	496	struct lm95245_data *data = i2c_get_clientdata(client);
	497
	498	hwmon_device_unregister(data->hwmon_dev);
	499	sysfs_remove_group(&client->dev.kobj, &lm95245_group);
	500
fffd80cc AS	501	return 0;
	502	}
	503
	504	/* Driver data (common to all clients) */
	505	static const struct i2c_device_id lm95245_id[] = {
	506	{ DEVNAME, 0 },
	507	{ }
	508	};
	509	MODULE_DEVICE_TABLE(i2c, lm95245_id);
	510
	511	static struct i2c_driver lm95245_driver = {
	512	.class = I2C_CLASS_HWMON,
	513	.driver = {
	514	.name = DEVNAME,
	515	},
	516	.probe = lm95245_probe,
	517	.remove = lm95245_remove,
	518	.id_table = lm95245_id,
	519	.detect = lm95245_detect,
	520	.address_list = normal_i2c,
	521	};
	522
f0967eea	523	module_i2c_driver(lm95245_driver);
fffd80cc AS	524
	525	MODULE_AUTHOR("Alexander Stein <alexander.stein@systec-electronic.com>");
	526	MODULE_DESCRIPTION("LM95245 sensor driver");
	527	MODULE_LICENSE("GPL");