659 lines
14 KiB
C
659 lines
14 KiB
C
/*
|
|
* ADT75 digital temperature sensor driver supporting ADT75
|
|
*
|
|
* Copyright 2010 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#include <linux/interrupt.h>
|
|
#include <linux/device.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/sysfs.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/module.h>
|
|
|
|
#include "../iio.h"
|
|
#include "../sysfs.h"
|
|
|
|
/*
|
|
* ADT75 registers definition
|
|
*/
|
|
|
|
#define ADT75_TEMPERATURE 0
|
|
#define ADT75_CONFIG 1
|
|
#define ADT75_T_HYST 2
|
|
#define ADT75_T_OS 3
|
|
#define ADT75_ONESHOT 4
|
|
|
|
/*
|
|
* ADT75 config
|
|
*/
|
|
#define ADT75_PD 0x1
|
|
#define ADT75_OS_INT 0x2
|
|
#define ADT75_OS_POLARITY 0x4
|
|
#define ADT75_FAULT_QUEUE_MASK 0x18
|
|
#define ADT75_FAULT_QUEUE_OFFSET 3
|
|
#define ADT75_SMBUS_ALART 0x8
|
|
|
|
/*
|
|
* ADT75 masks
|
|
*/
|
|
#define ADT75_VALUE_SIGN 0x800
|
|
#define ADT75_VALUE_OFFSET 4
|
|
#define ADT75_VALUE_FLOAT_OFFSET 4
|
|
#define ADT75_VALUE_FLOAT_MASK 0xF
|
|
|
|
|
|
/*
|
|
* struct adt75_chip_info - chip specifc information
|
|
*/
|
|
|
|
struct adt75_chip_info {
|
|
struct i2c_client *client;
|
|
u8 config;
|
|
};
|
|
|
|
/*
|
|
* adt75 register access by I2C
|
|
*/
|
|
|
|
static int adt75_i2c_read(struct iio_dev *dev_info, u8 reg, u8 *data)
|
|
{
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
struct i2c_client *client = chip->client;
|
|
int ret = 0, len;
|
|
|
|
ret = i2c_smbus_write_byte(client, reg);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "I2C read register address error\n");
|
|
return ret;
|
|
}
|
|
|
|
if (reg == ADT75_CONFIG || reg == ADT75_ONESHOT)
|
|
len = 1;
|
|
else
|
|
len = 2;
|
|
|
|
ret = i2c_master_recv(client, data, len);
|
|
if (ret < 0) {
|
|
dev_err(&client->dev, "I2C read error\n");
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int adt75_i2c_write(struct iio_dev *dev_info, u8 reg, u8 data)
|
|
{
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
struct i2c_client *client = chip->client;
|
|
int ret = 0;
|
|
|
|
if (reg == ADT75_CONFIG || reg == ADT75_ONESHOT)
|
|
ret = i2c_smbus_write_byte_data(client, reg, data);
|
|
else
|
|
ret = i2c_smbus_write_word_data(client, reg, data);
|
|
|
|
if (ret < 0)
|
|
dev_err(&client->dev, "I2C write error\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t adt75_show_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct adt75_chip_info *chip = iio_priv(dev_get_drvdata(dev));
|
|
|
|
if (chip->config & ADT75_PD)
|
|
return sprintf(buf, "power-save\n");
|
|
else
|
|
return sprintf(buf, "full\n");
|
|
}
|
|
|
|
static ssize_t adt75_store_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
int ret;
|
|
u8 config;
|
|
|
|
ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
config = chip->config & ~ADT75_PD;
|
|
if (!strcmp(buf, "full"))
|
|
config |= ADT75_PD;
|
|
|
|
ret = adt75_i2c_write(dev_info, ADT75_CONFIG, config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
chip->config = config;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static IIO_DEVICE_ATTR(mode, S_IRUGO | S_IWUSR,
|
|
adt75_show_mode,
|
|
adt75_store_mode,
|
|
0);
|
|
|
|
static ssize_t adt75_show_available_modes(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "full\npower-down\n");
|
|
}
|
|
|
|
static IIO_DEVICE_ATTR(available_modes, S_IRUGO, adt75_show_available_modes, NULL, 0);
|
|
|
|
static ssize_t adt75_show_oneshot(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct adt75_chip_info *chip = iio_priv(dev_get_drvdata(dev));
|
|
|
|
return sprintf(buf, "%d\n", !!(chip->config & ADT75_ONESHOT));
|
|
}
|
|
|
|
static ssize_t adt75_store_oneshot(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
unsigned long data = 0;
|
|
int ret;
|
|
u8 config;
|
|
|
|
ret = strict_strtoul(buf, 10, &data);
|
|
if (ret)
|
|
return -EINVAL;
|
|
|
|
|
|
ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
config = chip->config & ~ADT75_ONESHOT;
|
|
if (data)
|
|
config |= ADT75_ONESHOT;
|
|
|
|
ret = adt75_i2c_write(dev_info, ADT75_CONFIG, config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
chip->config = config;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static IIO_DEVICE_ATTR(oneshot, S_IRUGO | S_IWUSR,
|
|
adt75_show_oneshot,
|
|
adt75_store_oneshot,
|
|
0);
|
|
|
|
static ssize_t adt75_show_value(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
u16 data;
|
|
char sign = ' ';
|
|
int ret;
|
|
|
|
if (chip->config & ADT75_PD) {
|
|
dev_err(dev, "Can't read value in power-down mode.\n");
|
|
return -EIO;
|
|
}
|
|
|
|
if (chip->config & ADT75_ONESHOT) {
|
|
/* write to active converter */
|
|
ret = i2c_smbus_write_byte(chip->client, ADT75_ONESHOT);
|
|
if (ret)
|
|
return -EIO;
|
|
}
|
|
|
|
ret = adt75_i2c_read(dev_info, ADT75_TEMPERATURE, (u8 *)&data);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
data = swab16(data) >> ADT75_VALUE_OFFSET;
|
|
if (data & ADT75_VALUE_SIGN) {
|
|
/* convert supplement to positive value */
|
|
data = (ADT75_VALUE_SIGN << 1) - data;
|
|
sign = '-';
|
|
}
|
|
|
|
return sprintf(buf, "%c%d.%.4d\n", sign,
|
|
(data >> ADT75_VALUE_FLOAT_OFFSET),
|
|
(data & ADT75_VALUE_FLOAT_MASK) * 625);
|
|
}
|
|
|
|
static IIO_DEVICE_ATTR(value, S_IRUGO, adt75_show_value, NULL, 0);
|
|
|
|
static struct attribute *adt75_attributes[] = {
|
|
&iio_dev_attr_available_modes.dev_attr.attr,
|
|
&iio_dev_attr_mode.dev_attr.attr,
|
|
&iio_dev_attr_oneshot.dev_attr.attr,
|
|
&iio_dev_attr_value.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group adt75_attribute_group = {
|
|
.attrs = adt75_attributes,
|
|
};
|
|
|
|
/*
|
|
* temperature bound events
|
|
*/
|
|
|
|
#define IIO_EVENT_CODE_ADT75_OTI IIO_UNMOD_EVENT_CODE(IIO_TEMP, \
|
|
0, \
|
|
IIO_EV_TYPE_THRESH, \
|
|
IIO_EV_DIR_FALLING)
|
|
|
|
static irqreturn_t adt75_event_handler(int irq, void *private)
|
|
{
|
|
iio_push_event(private,
|
|
IIO_EVENT_CODE_ADT75_OTI,
|
|
iio_get_time_ns());
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static ssize_t adt75_show_oti_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
int ret;
|
|
|
|
/* retrive ALART status */
|
|
ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
if (chip->config & ADT75_OS_INT)
|
|
return sprintf(buf, "interrupt\n");
|
|
else
|
|
return sprintf(buf, "comparator\n");
|
|
}
|
|
|
|
static ssize_t adt75_set_oti_mode(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
int ret;
|
|
u8 config;
|
|
|
|
/* retrive ALART status */
|
|
ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
config = chip->config & ~ADT75_OS_INT;
|
|
if (strcmp(buf, "comparator") != 0)
|
|
config |= ADT75_OS_INT;
|
|
|
|
ret = adt75_i2c_write(dev_info, ADT75_CONFIG, config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
chip->config = config;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t adt75_show_available_oti_modes(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "comparator\ninterrupt\n");
|
|
}
|
|
|
|
static ssize_t adt75_show_smbus_alart(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
int ret;
|
|
|
|
/* retrive ALART status */
|
|
ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
return sprintf(buf, "%d\n", !!(chip->config & ADT75_SMBUS_ALART));
|
|
}
|
|
|
|
static ssize_t adt75_set_smbus_alart(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
unsigned long data = 0;
|
|
int ret;
|
|
u8 config;
|
|
|
|
ret = strict_strtoul(buf, 10, &data);
|
|
if (ret)
|
|
return -EINVAL;
|
|
|
|
/* retrive ALART status */
|
|
ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
config = chip->config & ~ADT75_SMBUS_ALART;
|
|
if (data)
|
|
config |= ADT75_SMBUS_ALART;
|
|
|
|
ret = adt75_i2c_write(dev_info, ADT75_CONFIG, config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
chip->config = config;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t adt75_show_fault_queue(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
int ret;
|
|
|
|
/* retrive ALART status */
|
|
ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
return sprintf(buf, "%d\n", (chip->config & ADT75_FAULT_QUEUE_MASK) >>
|
|
ADT75_FAULT_QUEUE_OFFSET);
|
|
}
|
|
|
|
static ssize_t adt75_set_fault_queue(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
struct adt75_chip_info *chip = iio_priv(dev_info);
|
|
unsigned long data;
|
|
int ret;
|
|
u8 config;
|
|
|
|
ret = strict_strtoul(buf, 10, &data);
|
|
if (ret || data > 3)
|
|
return -EINVAL;
|
|
|
|
/* retrive ALART status */
|
|
ret = adt75_i2c_read(dev_info, ADT75_CONFIG, &chip->config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
config = chip->config & ~ADT75_FAULT_QUEUE_MASK;
|
|
config |= (data << ADT75_FAULT_QUEUE_OFFSET);
|
|
ret = adt75_i2c_write(dev_info, ADT75_CONFIG, config);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
chip->config = config;
|
|
|
|
return ret;
|
|
}
|
|
static inline ssize_t adt75_show_t_bound(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
u16 data;
|
|
char sign = ' ';
|
|
int ret;
|
|
|
|
ret = adt75_i2c_read(dev_info, this_attr->address, (u8 *)&data);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
data = swab16(data) >> ADT75_VALUE_OFFSET;
|
|
if (data & ADT75_VALUE_SIGN) {
|
|
/* convert supplement to positive value */
|
|
data = (ADT75_VALUE_SIGN << 1) - data;
|
|
sign = '-';
|
|
}
|
|
|
|
return sprintf(buf, "%c%d.%.4d\n", sign,
|
|
(data >> ADT75_VALUE_FLOAT_OFFSET),
|
|
(data & ADT75_VALUE_FLOAT_MASK) * 625);
|
|
}
|
|
|
|
static inline ssize_t adt75_set_t_bound(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf,
|
|
size_t len)
|
|
{
|
|
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
|
|
struct iio_dev *dev_info = dev_get_drvdata(dev);
|
|
long tmp1, tmp2;
|
|
u16 data;
|
|
char *pos;
|
|
int ret;
|
|
|
|
pos = strchr(buf, '.');
|
|
|
|
ret = strict_strtol(buf, 10, &tmp1);
|
|
|
|
if (ret || tmp1 > 127 || tmp1 < -128)
|
|
return -EINVAL;
|
|
|
|
if (pos) {
|
|
len = strlen(pos);
|
|
if (len > ADT75_VALUE_FLOAT_OFFSET)
|
|
len = ADT75_VALUE_FLOAT_OFFSET;
|
|
pos[len] = 0;
|
|
ret = strict_strtol(pos, 10, &tmp2);
|
|
|
|
if (!ret)
|
|
tmp2 = (tmp2 / 625) * 625;
|
|
}
|
|
|
|
if (tmp1 < 0)
|
|
data = (u16)(-tmp1);
|
|
else
|
|
data = (u16)tmp1;
|
|
data = (data << ADT75_VALUE_FLOAT_OFFSET) | (tmp2 & ADT75_VALUE_FLOAT_MASK);
|
|
if (tmp1 < 0)
|
|
/* convert positive value to supplyment */
|
|
data = (ADT75_VALUE_SIGN << 1) - data;
|
|
data <<= ADT75_VALUE_OFFSET;
|
|
data = swab16(data);
|
|
|
|
ret = adt75_i2c_write(dev_info, this_attr->address, (u8)data);
|
|
if (ret)
|
|
return -EIO;
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
static IIO_DEVICE_ATTR(oti_mode,
|
|
S_IRUGO | S_IWUSR,
|
|
adt75_show_oti_mode, adt75_set_oti_mode, 0);
|
|
static IIO_DEVICE_ATTR(available_oti_modes,
|
|
S_IRUGO,
|
|
adt75_show_available_oti_modes, NULL, 0);
|
|
static IIO_DEVICE_ATTR(smbus_alart,
|
|
S_IRUGO | S_IWUSR,
|
|
adt75_show_smbus_alart, adt75_set_smbus_alart, 0);
|
|
static IIO_DEVICE_ATTR(fault_queue,
|
|
S_IRUGO | S_IWUSR,
|
|
adt75_show_fault_queue, adt75_set_fault_queue, 0);
|
|
static IIO_DEVICE_ATTR(t_os_value,
|
|
S_IRUGO | S_IWUSR,
|
|
adt75_show_t_bound, adt75_set_t_bound,
|
|
ADT75_T_OS);
|
|
static IIO_DEVICE_ATTR(t_hyst_value,
|
|
S_IRUGO | S_IWUSR,
|
|
adt75_show_t_bound, adt75_set_t_bound,
|
|
ADT75_T_HYST);
|
|
|
|
static struct attribute *adt75_event_attributes[] = {
|
|
&iio_dev_attr_oti_mode.dev_attr.attr,
|
|
&iio_dev_attr_available_oti_modes.dev_attr.attr,
|
|
&iio_dev_attr_smbus_alart.dev_attr.attr,
|
|
&iio_dev_attr_fault_queue.dev_attr.attr,
|
|
&iio_dev_attr_t_os_value.dev_attr.attr,
|
|
&iio_dev_attr_t_hyst_value.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group adt75_event_attribute_group = {
|
|
.attrs = adt75_event_attributes,
|
|
.name = "events",
|
|
};
|
|
|
|
static const struct iio_info adt75_info = {
|
|
.attrs = &adt75_attribute_group,
|
|
.event_attrs = &adt75_event_attribute_group,
|
|
.driver_module = THIS_MODULE,
|
|
};
|
|
|
|
/*
|
|
* device probe and remove
|
|
*/
|
|
|
|
static int __devinit adt75_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
struct adt75_chip_info *chip;
|
|
struct iio_dev *indio_dev;
|
|
int ret = 0;
|
|
|
|
indio_dev = iio_allocate_device(sizeof(*chip));
|
|
if (indio_dev == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
chip = iio_priv(indio_dev);
|
|
|
|
/* this is only used for device removal purposes */
|
|
i2c_set_clientdata(client, indio_dev);
|
|
|
|
chip->client = client;
|
|
|
|
indio_dev->name = id->name;
|
|
indio_dev->dev.parent = &client->dev;
|
|
indio_dev->info = &adt75_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret)
|
|
goto error_free_dev;
|
|
|
|
if (client->irq > 0) {
|
|
ret = request_threaded_irq(client->irq,
|
|
NULL,
|
|
&adt75_event_handler,
|
|
IRQF_TRIGGER_LOW,
|
|
indio_dev->name,
|
|
indio_dev);
|
|
if (ret)
|
|
goto error_unreg_dev;
|
|
|
|
ret = adt75_i2c_read(indio_dev, ADT75_CONFIG, &chip->config);
|
|
if (ret) {
|
|
ret = -EIO;
|
|
goto error_unreg_irq;
|
|
}
|
|
|
|
/* set irq polarity low level */
|
|
chip->config &= ~ADT75_OS_POLARITY;
|
|
|
|
ret = adt75_i2c_write(indio_dev, ADT75_CONFIG, chip->config);
|
|
if (ret) {
|
|
ret = -EIO;
|
|
goto error_unreg_irq;
|
|
}
|
|
}
|
|
|
|
dev_info(&client->dev, "%s temperature sensor registered.\n",
|
|
indio_dev->name);
|
|
|
|
return 0;
|
|
error_unreg_irq:
|
|
free_irq(client->irq, indio_dev);
|
|
error_unreg_dev:
|
|
iio_device_unregister(indio_dev);
|
|
error_free_dev:
|
|
iio_free_device(indio_dev);
|
|
error_ret:
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit adt75_remove(struct i2c_client *client)
|
|
{
|
|
struct iio_dev *indio_dev = i2c_get_clientdata(client);
|
|
|
|
if (client->irq)
|
|
free_irq(client->irq, indio_dev);
|
|
iio_device_unregister(indio_dev);
|
|
iio_free_device(indio_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id adt75_id[] = {
|
|
{ "adt75", 0 },
|
|
{}
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(i2c, adt75_id);
|
|
|
|
static struct i2c_driver adt75_driver = {
|
|
.driver = {
|
|
.name = "adt75",
|
|
},
|
|
.probe = adt75_probe,
|
|
.remove = __devexit_p(adt75_remove),
|
|
.id_table = adt75_id,
|
|
};
|
|
|
|
static __init int adt75_init(void)
|
|
{
|
|
return i2c_add_driver(&adt75_driver);
|
|
}
|
|
|
|
static __exit void adt75_exit(void)
|
|
{
|
|
i2c_del_driver(&adt75_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Sonic Zhang <sonic.zhang@analog.com>");
|
|
MODULE_DESCRIPTION("Analog Devices ADT75 digital"
|
|
" temperature sensor driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
|
|
module_init(adt75_init);
|
|
module_exit(adt75_exit);
|