mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Guenter Roeck](/assets/img/avatar_default.png)
Signed-off-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Jean Delvare <khali@linux-fr.org>
605 lines
16 KiB
C
605 lines
16 KiB
C
/*
|
|
* jc42.c - driver for Jedec JC42.4 compliant temperature sensors
|
|
*
|
|
* Copyright (c) 2010 Ericsson AB.
|
|
*
|
|
* Derived from lm77.c by Andras BALI <drewie@freemail.hu>.
|
|
*
|
|
* JC42.4 compliant temperature sensors are typically used on memory modules.
|
|
*
|
|
* 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>
|
|
|
|
/* Addresses to scan */
|
|
static const unsigned short normal_i2c[] = {
|
|
0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, I2C_CLIENT_END };
|
|
|
|
/* JC42 registers. All registers are 16 bit. */
|
|
#define JC42_REG_CAP 0x00
|
|
#define JC42_REG_CONFIG 0x01
|
|
#define JC42_REG_TEMP_UPPER 0x02
|
|
#define JC42_REG_TEMP_LOWER 0x03
|
|
#define JC42_REG_TEMP_CRITICAL 0x04
|
|
#define JC42_REG_TEMP 0x05
|
|
#define JC42_REG_MANID 0x06
|
|
#define JC42_REG_DEVICEID 0x07
|
|
|
|
/* Status bits in temperature register */
|
|
#define JC42_ALARM_CRIT_BIT 15
|
|
#define JC42_ALARM_MAX_BIT 14
|
|
#define JC42_ALARM_MIN_BIT 13
|
|
|
|
/* Configuration register defines */
|
|
#define JC42_CFG_CRIT_ONLY (1 << 2)
|
|
#define JC42_CFG_TCRIT_LOCK (1 << 6)
|
|
#define JC42_CFG_EVENT_LOCK (1 << 7)
|
|
#define JC42_CFG_SHUTDOWN (1 << 8)
|
|
#define JC42_CFG_HYST_SHIFT 9
|
|
#define JC42_CFG_HYST_MASK (0x03 << 9)
|
|
|
|
/* Capabilities */
|
|
#define JC42_CAP_RANGE (1 << 2)
|
|
|
|
/* Manufacturer IDs */
|
|
#define ADT_MANID 0x11d4 /* Analog Devices */
|
|
#define ATMEL_MANID 0x001f /* Atmel */
|
|
#define MAX_MANID 0x004d /* Maxim */
|
|
#define IDT_MANID 0x00b3 /* IDT */
|
|
#define MCP_MANID 0x0054 /* Microchip */
|
|
#define NXP_MANID 0x1131 /* NXP Semiconductors */
|
|
#define ONS_MANID 0x1b09 /* ON Semiconductor */
|
|
#define STM_MANID 0x104a /* ST Microelectronics */
|
|
|
|
/* Supported chips */
|
|
|
|
/* Analog Devices */
|
|
#define ADT7408_DEVID 0x0801
|
|
#define ADT7408_DEVID_MASK 0xffff
|
|
|
|
/* Atmel */
|
|
#define AT30TS00_DEVID 0x8201
|
|
#define AT30TS00_DEVID_MASK 0xffff
|
|
|
|
/* IDT */
|
|
#define TS3000B3_DEVID 0x2903 /* Also matches TSE2002B3 */
|
|
#define TS3000B3_DEVID_MASK 0xffff
|
|
|
|
#define TS3000GB2_DEVID 0x2912 /* Also matches TSE2002GB2 */
|
|
#define TS3000GB2_DEVID_MASK 0xffff
|
|
|
|
/* Maxim */
|
|
#define MAX6604_DEVID 0x3e00
|
|
#define MAX6604_DEVID_MASK 0xffff
|
|
|
|
/* Microchip */
|
|
#define MCP9804_DEVID 0x0200
|
|
#define MCP9804_DEVID_MASK 0xfffc
|
|
|
|
#define MCP98242_DEVID 0x2000
|
|
#define MCP98242_DEVID_MASK 0xfffc
|
|
|
|
#define MCP98243_DEVID 0x2100
|
|
#define MCP98243_DEVID_MASK 0xfffc
|
|
|
|
#define MCP98244_DEVID 0x2200
|
|
#define MCP98244_DEVID_MASK 0xfffc
|
|
|
|
#define MCP9843_DEVID 0x0000 /* Also matches mcp9805 */
|
|
#define MCP9843_DEVID_MASK 0xfffe
|
|
|
|
/* NXP */
|
|
#define SE97_DEVID 0xa200
|
|
#define SE97_DEVID_MASK 0xfffc
|
|
|
|
#define SE98_DEVID 0xa100
|
|
#define SE98_DEVID_MASK 0xfffc
|
|
|
|
/* ON Semiconductor */
|
|
#define CAT6095_DEVID 0x0800 /* Also matches CAT34TS02 */
|
|
#define CAT6095_DEVID_MASK 0xffe0
|
|
|
|
/* ST Microelectronics */
|
|
#define STTS424_DEVID 0x0101
|
|
#define STTS424_DEVID_MASK 0xffff
|
|
|
|
#define STTS424E_DEVID 0x0000
|
|
#define STTS424E_DEVID_MASK 0xfffe
|
|
|
|
#define STTS2002_DEVID 0x0300
|
|
#define STTS2002_DEVID_MASK 0xffff
|
|
|
|
#define STTS3000_DEVID 0x0200
|
|
#define STTS3000_DEVID_MASK 0xffff
|
|
|
|
static u16 jc42_hysteresis[] = { 0, 1500, 3000, 6000 };
|
|
|
|
struct jc42_chips {
|
|
u16 manid;
|
|
u16 devid;
|
|
u16 devid_mask;
|
|
};
|
|
|
|
static struct jc42_chips jc42_chips[] = {
|
|
{ ADT_MANID, ADT7408_DEVID, ADT7408_DEVID_MASK },
|
|
{ ATMEL_MANID, AT30TS00_DEVID, AT30TS00_DEVID_MASK },
|
|
{ IDT_MANID, TS3000B3_DEVID, TS3000B3_DEVID_MASK },
|
|
{ IDT_MANID, TS3000GB2_DEVID, TS3000GB2_DEVID_MASK },
|
|
{ MAX_MANID, MAX6604_DEVID, MAX6604_DEVID_MASK },
|
|
{ MCP_MANID, MCP9804_DEVID, MCP9804_DEVID_MASK },
|
|
{ MCP_MANID, MCP98242_DEVID, MCP98242_DEVID_MASK },
|
|
{ MCP_MANID, MCP98243_DEVID, MCP98243_DEVID_MASK },
|
|
{ MCP_MANID, MCP98244_DEVID, MCP98244_DEVID_MASK },
|
|
{ MCP_MANID, MCP9843_DEVID, MCP9843_DEVID_MASK },
|
|
{ NXP_MANID, SE97_DEVID, SE97_DEVID_MASK },
|
|
{ ONS_MANID, CAT6095_DEVID, CAT6095_DEVID_MASK },
|
|
{ NXP_MANID, SE98_DEVID, SE98_DEVID_MASK },
|
|
{ STM_MANID, STTS424_DEVID, STTS424_DEVID_MASK },
|
|
{ STM_MANID, STTS424E_DEVID, STTS424E_DEVID_MASK },
|
|
{ STM_MANID, STTS2002_DEVID, STTS2002_DEVID_MASK },
|
|
{ STM_MANID, STTS3000_DEVID, STTS3000_DEVID_MASK },
|
|
};
|
|
|
|
/* Each client has this additional data */
|
|
struct jc42_data {
|
|
struct device *hwmon_dev;
|
|
struct mutex update_lock; /* protect register access */
|
|
bool extended; /* true if extended range supported */
|
|
bool valid;
|
|
unsigned long last_updated; /* In jiffies */
|
|
u16 orig_config; /* original configuration */
|
|
u16 config; /* current configuration */
|
|
u16 temp_input; /* Temperatures */
|
|
u16 temp_crit;
|
|
u16 temp_min;
|
|
u16 temp_max;
|
|
};
|
|
|
|
static int jc42_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id);
|
|
static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info);
|
|
static int jc42_remove(struct i2c_client *client);
|
|
|
|
static struct jc42_data *jc42_update_device(struct device *dev);
|
|
|
|
static const struct i2c_device_id jc42_id[] = {
|
|
{ "jc42", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, jc42_id);
|
|
|
|
#ifdef CONFIG_PM
|
|
|
|
static int jc42_suspend(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct jc42_data *data = i2c_get_clientdata(client);
|
|
|
|
data->config |= JC42_CFG_SHUTDOWN;
|
|
i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, data->config);
|
|
return 0;
|
|
}
|
|
|
|
static int jc42_resume(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct jc42_data *data = i2c_get_clientdata(client);
|
|
|
|
data->config &= ~JC42_CFG_SHUTDOWN;
|
|
i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, data->config);
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops jc42_dev_pm_ops = {
|
|
.suspend = jc42_suspend,
|
|
.resume = jc42_resume,
|
|
};
|
|
|
|
#define JC42_DEV_PM_OPS (&jc42_dev_pm_ops)
|
|
#else
|
|
#define JC42_DEV_PM_OPS NULL
|
|
#endif /* CONFIG_PM */
|
|
|
|
/* This is the driver that will be inserted */
|
|
static struct i2c_driver jc42_driver = {
|
|
.class = I2C_CLASS_SPD,
|
|
.driver = {
|
|
.name = "jc42",
|
|
.pm = JC42_DEV_PM_OPS,
|
|
},
|
|
.probe = jc42_probe,
|
|
.remove = jc42_remove,
|
|
.id_table = jc42_id,
|
|
.detect = jc42_detect,
|
|
.address_list = normal_i2c,
|
|
};
|
|
|
|
#define JC42_TEMP_MIN_EXTENDED (-40000)
|
|
#define JC42_TEMP_MIN 0
|
|
#define JC42_TEMP_MAX 125000
|
|
|
|
static u16 jc42_temp_to_reg(int temp, bool extended)
|
|
{
|
|
int ntemp = clamp_val(temp,
|
|
extended ? JC42_TEMP_MIN_EXTENDED :
|
|
JC42_TEMP_MIN, JC42_TEMP_MAX);
|
|
|
|
/* convert from 0.001 to 0.0625 resolution */
|
|
return (ntemp * 2 / 125) & 0x1fff;
|
|
}
|
|
|
|
static int jc42_temp_from_reg(s16 reg)
|
|
{
|
|
reg &= 0x1fff;
|
|
|
|
/* sign extend register */
|
|
if (reg & 0x1000)
|
|
reg |= 0xf000;
|
|
|
|
/* convert from 0.0625 to 0.001 resolution */
|
|
return reg * 125 / 2;
|
|
}
|
|
|
|
/* sysfs stuff */
|
|
|
|
/* read routines for temperature limits */
|
|
#define show(value) \
|
|
static ssize_t show_##value(struct device *dev, \
|
|
struct device_attribute *attr, \
|
|
char *buf) \
|
|
{ \
|
|
struct jc42_data *data = jc42_update_device(dev); \
|
|
if (IS_ERR(data)) \
|
|
return PTR_ERR(data); \
|
|
return sprintf(buf, "%d\n", jc42_temp_from_reg(data->value)); \
|
|
}
|
|
|
|
show(temp_input);
|
|
show(temp_crit);
|
|
show(temp_min);
|
|
show(temp_max);
|
|
|
|
/* read routines for hysteresis values */
|
|
static ssize_t show_temp_crit_hyst(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct jc42_data *data = jc42_update_device(dev);
|
|
int temp, hyst;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
temp = jc42_temp_from_reg(data->temp_crit);
|
|
hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK)
|
|
>> JC42_CFG_HYST_SHIFT];
|
|
return sprintf(buf, "%d\n", temp - hyst);
|
|
}
|
|
|
|
static ssize_t show_temp_max_hyst(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct jc42_data *data = jc42_update_device(dev);
|
|
int temp, hyst;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
temp = jc42_temp_from_reg(data->temp_max);
|
|
hyst = jc42_hysteresis[(data->config & JC42_CFG_HYST_MASK)
|
|
>> JC42_CFG_HYST_SHIFT];
|
|
return sprintf(buf, "%d\n", temp - hyst);
|
|
}
|
|
|
|
/* write routines */
|
|
#define set(value, reg) \
|
|
static ssize_t set_##value(struct device *dev, \
|
|
struct device_attribute *attr, \
|
|
const char *buf, size_t count) \
|
|
{ \
|
|
struct i2c_client *client = to_i2c_client(dev); \
|
|
struct jc42_data *data = i2c_get_clientdata(client); \
|
|
int err, ret = count; \
|
|
long val; \
|
|
if (kstrtol(buf, 10, &val) < 0) \
|
|
return -EINVAL; \
|
|
mutex_lock(&data->update_lock); \
|
|
data->value = jc42_temp_to_reg(val, data->extended); \
|
|
err = i2c_smbus_write_word_swapped(client, reg, data->value); \
|
|
if (err < 0) \
|
|
ret = err; \
|
|
mutex_unlock(&data->update_lock); \
|
|
return ret; \
|
|
}
|
|
|
|
set(temp_min, JC42_REG_TEMP_LOWER);
|
|
set(temp_max, JC42_REG_TEMP_UPPER);
|
|
set(temp_crit, JC42_REG_TEMP_CRITICAL);
|
|
|
|
/*
|
|
* JC42.4 compliant chips only support four hysteresis values.
|
|
* Pick best choice and go from there.
|
|
*/
|
|
static ssize_t set_temp_crit_hyst(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct jc42_data *data = i2c_get_clientdata(client);
|
|
unsigned long val;
|
|
int diff, hyst;
|
|
int err;
|
|
int ret = count;
|
|
|
|
if (kstrtoul(buf, 10, &val) < 0)
|
|
return -EINVAL;
|
|
|
|
diff = jc42_temp_from_reg(data->temp_crit) - val;
|
|
hyst = 0;
|
|
if (diff > 0) {
|
|
if (diff < 2250)
|
|
hyst = 1; /* 1.5 degrees C */
|
|
else if (diff < 4500)
|
|
hyst = 2; /* 3.0 degrees C */
|
|
else
|
|
hyst = 3; /* 6.0 degrees C */
|
|
}
|
|
|
|
mutex_lock(&data->update_lock);
|
|
data->config = (data->config & ~JC42_CFG_HYST_MASK)
|
|
| (hyst << JC42_CFG_HYST_SHIFT);
|
|
err = i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG,
|
|
data->config);
|
|
if (err < 0)
|
|
ret = err;
|
|
mutex_unlock(&data->update_lock);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t show_alarm(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
u16 bit = to_sensor_dev_attr(attr)->index;
|
|
struct jc42_data *data = jc42_update_device(dev);
|
|
u16 val;
|
|
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
val = data->temp_input;
|
|
if (bit != JC42_ALARM_CRIT_BIT && (data->config & JC42_CFG_CRIT_ONLY))
|
|
val = 0;
|
|
return sprintf(buf, "%u\n", (val >> bit) & 1);
|
|
}
|
|
|
|
static DEVICE_ATTR(temp1_input, S_IRUGO,
|
|
show_temp_input, NULL);
|
|
static DEVICE_ATTR(temp1_crit, S_IRUGO,
|
|
show_temp_crit, set_temp_crit);
|
|
static DEVICE_ATTR(temp1_min, S_IRUGO,
|
|
show_temp_min, set_temp_min);
|
|
static DEVICE_ATTR(temp1_max, S_IRUGO,
|
|
show_temp_max, set_temp_max);
|
|
|
|
static DEVICE_ATTR(temp1_crit_hyst, S_IRUGO,
|
|
show_temp_crit_hyst, set_temp_crit_hyst);
|
|
static DEVICE_ATTR(temp1_max_hyst, S_IRUGO,
|
|
show_temp_max_hyst, NULL);
|
|
|
|
static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL,
|
|
JC42_ALARM_CRIT_BIT);
|
|
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL,
|
|
JC42_ALARM_MIN_BIT);
|
|
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL,
|
|
JC42_ALARM_MAX_BIT);
|
|
|
|
static struct attribute *jc42_attributes[] = {
|
|
&dev_attr_temp1_input.attr,
|
|
&dev_attr_temp1_crit.attr,
|
|
&dev_attr_temp1_min.attr,
|
|
&dev_attr_temp1_max.attr,
|
|
&dev_attr_temp1_crit_hyst.attr,
|
|
&dev_attr_temp1_max_hyst.attr,
|
|
&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
|
|
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
|
|
NULL
|
|
};
|
|
|
|
static umode_t jc42_attribute_mode(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 jc42_data *data = i2c_get_clientdata(client);
|
|
unsigned int config = data->config;
|
|
bool readonly;
|
|
|
|
if (attr == &dev_attr_temp1_crit.attr)
|
|
readonly = config & JC42_CFG_TCRIT_LOCK;
|
|
else if (attr == &dev_attr_temp1_min.attr ||
|
|
attr == &dev_attr_temp1_max.attr)
|
|
readonly = config & JC42_CFG_EVENT_LOCK;
|
|
else if (attr == &dev_attr_temp1_crit_hyst.attr)
|
|
readonly = config & (JC42_CFG_EVENT_LOCK | JC42_CFG_TCRIT_LOCK);
|
|
else
|
|
readonly = true;
|
|
|
|
return S_IRUGO | (readonly ? 0 : S_IWUSR);
|
|
}
|
|
|
|
static const struct attribute_group jc42_group = {
|
|
.attrs = jc42_attributes,
|
|
.is_visible = jc42_attribute_mode,
|
|
};
|
|
|
|
/* Return 0 if detection is successful, -ENODEV otherwise */
|
|
static int jc42_detect(struct i2c_client *client, struct i2c_board_info *info)
|
|
{
|
|
struct i2c_adapter *adapter = client->adapter;
|
|
int i, config, cap, manid, devid;
|
|
|
|
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
|
|
I2C_FUNC_SMBUS_WORD_DATA))
|
|
return -ENODEV;
|
|
|
|
cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP);
|
|
config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
|
|
manid = i2c_smbus_read_word_swapped(client, JC42_REG_MANID);
|
|
devid = i2c_smbus_read_word_swapped(client, JC42_REG_DEVICEID);
|
|
|
|
if (cap < 0 || config < 0 || manid < 0 || devid < 0)
|
|
return -ENODEV;
|
|
|
|
if ((cap & 0xff00) || (config & 0xf800))
|
|
return -ENODEV;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(jc42_chips); i++) {
|
|
struct jc42_chips *chip = &jc42_chips[i];
|
|
if (manid == chip->manid &&
|
|
(devid & chip->devid_mask) == chip->devid) {
|
|
strlcpy(info->type, "jc42", I2C_NAME_SIZE);
|
|
return 0;
|
|
}
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int jc42_probe(struct i2c_client *client, const struct i2c_device_id *id)
|
|
{
|
|
struct jc42_data *data;
|
|
int config, cap, err;
|
|
struct device *dev = &client->dev;
|
|
|
|
data = devm_kzalloc(dev, sizeof(struct jc42_data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
i2c_set_clientdata(client, data);
|
|
mutex_init(&data->update_lock);
|
|
|
|
cap = i2c_smbus_read_word_swapped(client, JC42_REG_CAP);
|
|
if (cap < 0)
|
|
return cap;
|
|
|
|
data->extended = !!(cap & JC42_CAP_RANGE);
|
|
|
|
config = i2c_smbus_read_word_swapped(client, JC42_REG_CONFIG);
|
|
if (config < 0)
|
|
return config;
|
|
|
|
data->orig_config = config;
|
|
if (config & JC42_CFG_SHUTDOWN) {
|
|
config &= ~JC42_CFG_SHUTDOWN;
|
|
i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
|
|
}
|
|
data->config = config;
|
|
|
|
/* Register sysfs hooks */
|
|
err = sysfs_create_group(&dev->kobj, &jc42_group);
|
|
if (err)
|
|
return err;
|
|
|
|
data->hwmon_dev = hwmon_device_register(dev);
|
|
if (IS_ERR(data->hwmon_dev)) {
|
|
err = PTR_ERR(data->hwmon_dev);
|
|
goto exit_remove;
|
|
}
|
|
|
|
return 0;
|
|
|
|
exit_remove:
|
|
sysfs_remove_group(&dev->kobj, &jc42_group);
|
|
return err;
|
|
}
|
|
|
|
static int jc42_remove(struct i2c_client *client)
|
|
{
|
|
struct jc42_data *data = i2c_get_clientdata(client);
|
|
hwmon_device_unregister(data->hwmon_dev);
|
|
sysfs_remove_group(&client->dev.kobj, &jc42_group);
|
|
|
|
/* Restore original configuration except hysteresis */
|
|
if ((data->config & ~JC42_CFG_HYST_MASK) !=
|
|
(data->orig_config & ~JC42_CFG_HYST_MASK)) {
|
|
int config;
|
|
|
|
config = (data->orig_config & ~JC42_CFG_HYST_MASK)
|
|
| (data->config & JC42_CFG_HYST_MASK);
|
|
i2c_smbus_write_word_swapped(client, JC42_REG_CONFIG, config);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct jc42_data *jc42_update_device(struct device *dev)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(dev);
|
|
struct jc42_data *data = i2c_get_clientdata(client);
|
|
struct jc42_data *ret = data;
|
|
int val;
|
|
|
|
mutex_lock(&data->update_lock);
|
|
|
|
if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
|
|
val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP);
|
|
if (val < 0) {
|
|
ret = ERR_PTR(val);
|
|
goto abort;
|
|
}
|
|
data->temp_input = val;
|
|
|
|
val = i2c_smbus_read_word_swapped(client,
|
|
JC42_REG_TEMP_CRITICAL);
|
|
if (val < 0) {
|
|
ret = ERR_PTR(val);
|
|
goto abort;
|
|
}
|
|
data->temp_crit = val;
|
|
|
|
val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP_LOWER);
|
|
if (val < 0) {
|
|
ret = ERR_PTR(val);
|
|
goto abort;
|
|
}
|
|
data->temp_min = val;
|
|
|
|
val = i2c_smbus_read_word_swapped(client, JC42_REG_TEMP_UPPER);
|
|
if (val < 0) {
|
|
ret = ERR_PTR(val);
|
|
goto abort;
|
|
}
|
|
data->temp_max = val;
|
|
|
|
data->last_updated = jiffies;
|
|
data->valid = true;
|
|
}
|
|
abort:
|
|
mutex_unlock(&data->update_lock);
|
|
return ret;
|
|
}
|
|
|
|
module_i2c_driver(jc42_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
|
|
MODULE_DESCRIPTION("JC42 driver");
|
|
MODULE_LICENSE("GPL");
|