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hwmon: Add driver for SMSC EMC2103 temperature monitor and fan controller

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SMSC's EMC2103 family of temperature/fan controllers have 1
onboard and up to 3 external temperature sensors, and allow
closed-loop control of one fan.  This patch adds support for
them.

Signed-off-by: Steve Glendinning <steve.glendinning@smsc.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Steve Glendinning 2010-08-14 21:08:54 +02:00 committed by Jean Delvare
parent 5a9c2cd881
commit 9df7305b5a
5 changed files with 791 additions and 0 deletions
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33
Documentation/hwmon/emc2103 Normal file
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@ -0,0 +1,33 @@
Kernel driver emc2103
======================
Supported chips:
* SMSC EMC2103
Addresses scanned: I2C 0x2e
Prefix: 'emc2103'
Datasheet: Not public
Authors:
Steve Glendinning <steve.glendinning@smsc.com>
Description
-----------
The Standard Microsystems Corporation (SMSC) EMC2103 chips
contain up to 4 temperature sensors and a single fan controller.
Fan rotation speeds are reported in RPM (rotations per minute). An alarm is
triggered if the rotation speed has dropped below a programmable limit. Fan
readings can be divided by a programmable divider (1, 2, 4 or 8) to give
the readings more range or accuracy. Not all RPM values can accurately be
represented, so some rounding is done. With a divider of 1, the lowest
representable value is 480 RPM.
This driver supports RPM based control, to use this a fan target
should be written to fan1_target and pwm1_enable should be set to 3.
The 2103-2 and 2103-4 variants have a third temperature sensor, which can
be connected to two anti-parallel diodes. These values can be read
as temp3 and temp4. If only one diode is attached to this channel, temp4
will show as "fault". The module parameter "apd=0" can be used to suppress
this 4th channel when anti-parallel diodes are not fitted.

7
MAINTAINERS
View File

@ -5279,6 +5279,13 @@ S: Maintained
F: Documentation/hwmon/smm665
F: drivers/hwmon/smm665.c
SMSC EMC2103 HARDWARE MONITOR DRIVER
M: Steve Glendinning <steve.glendinning@smsc.com>
L: lm-sensors@lm-sensors.org
S: Supported
F: Documentation/hwmon/emc2103
F: drivers/hwmon/emc2103.c
SMSC47B397 HARDWARE MONITOR DRIVER
M: "Mark M. Hoffman" <mhoffman@lightlink.com>
L: lm-sensors@lm-sensors.org

10
drivers/hwmon/Kconfig
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@ -804,6 +804,16 @@ config SENSORS_EMC1403
Threshold values can be configured using sysfs.
Data from the different diodes are accessible via sysfs.
config SENSORS_EMC2103
tristate "SMSC EMC2103"
depends on I2C
help
If you say yes here you get support for the temperature
and fan sensors of the SMSC EMC2103 chips.
This driver can also be built as a module. If so, the module
will be called emc2103.
config SENSORS_SMSC47M1
tristate "SMSC LPC47M10x and compatibles"
help

1
drivers/hwmon/Makefile
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@ -43,6 +43,7 @@ obj-$(CONFIG_SENSORS_PKGTEMP) += pkgtemp.o
obj-$(CONFIG_SENSORS_DME1737) += dme1737.o
obj-$(CONFIG_SENSORS_DS1621) += ds1621.o
obj-$(CONFIG_SENSORS_EMC1403) += emc1403.o
obj-$(CONFIG_SENSORS_EMC2103) += emc2103.o
obj-$(CONFIG_SENSORS_F71805F) += f71805f.o
obj-$(CONFIG_SENSORS_F71882FG) += f71882fg.o
obj-$(CONFIG_SENSORS_F75375S) += f75375s.o

740
drivers/hwmon/emc2103.c Normal file
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@ -0,0 +1,740 @@
/*
emc2103.c - Support for SMSC EMC2103
Copyright (c) 2010 SMSC
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 scanned */
static const unsigned short normal_i2c[] = { 0x2E, I2C_CLIENT_END };
static const u8 REG_TEMP[4] = { 0x00, 0x02, 0x04, 0x06 };
static const u8 REG_TEMP_MIN[4] = { 0x3c, 0x38, 0x39, 0x3a };
static const u8 REG_TEMP_MAX[4] = { 0x34, 0x30, 0x31, 0x32 };
#define REG_CONF1 0x20
#define REG_TEMP_MAX_ALARM 0x24
#define REG_TEMP_MIN_ALARM 0x25
#define REG_FAN_CONF1 0x42
#define REG_FAN_TARGET_LO 0x4c
#define REG_FAN_TARGET_HI 0x4d
#define REG_FAN_TACH_HI 0x4e
#define REG_FAN_TACH_LO 0x4f
#define REG_PRODUCT_ID 0xfd
#define REG_MFG_ID 0xfe
/* equation 4 from datasheet: rpm = (3932160 * multipler) / count */
#define FAN_RPM_FACTOR 3932160
/* 2103-2 and 2103-4's 3rd temperature sensor can be connected to two diodes
* in anti-parallel mode, and in this configuration both can be read
* independently (so we have 4 temperature inputs). The device can't
* detect if it's connected in this mode, so we have to manually enable
* it. Default is to leave the device in the state it's already in (-1).
* This parameter allows APD mode to be optionally forced on or off */
static int apd = -1;
module_param(apd, bool, 0);
MODULE_PARM_DESC(init, "Set to zero to disable anti-parallel diode mode");
struct temperature {
s8 degrees;
u8 fraction; /* 0-7 multiples of 0.125 */
};
struct emc2103_data {
struct device *hwmon_dev;
struct mutex update_lock;
bool valid; /* registers are valid */
bool fan_rpm_control;
int temp_count; /* num of temp sensors */
unsigned long last_updated; /* in jiffies */
struct temperature temp[4]; /* internal + 3 external */
s8 temp_min[4]; /* no fractional part */
s8 temp_max[4]; /* no fractional part */
u8 temp_min_alarm;
u8 temp_max_alarm;
u8 fan_multiplier;
u16 fan_tach;
u16 fan_target;
};
static int read_u8_from_i2c(struct i2c_client *client, u8 i2c_reg, u8 *output)
{
int status = i2c_smbus_read_byte_data(client, i2c_reg);
if (status < 0) {
dev_warn(&client->dev, "reg 0x%02x, err %d\n",
i2c_reg, status);
} else {
*output = status;
}
return status;
}
static void read_temp_from_i2c(struct i2c_client *client, u8 i2c_reg,
struct temperature *temp)
{
u8 degrees, fractional;
if (read_u8_from_i2c(client, i2c_reg, &degrees) < 0)
return;
if (read_u8_from_i2c(client, i2c_reg + 1, &fractional) < 0)
return;
temp->degrees = degrees;
temp->fraction = (fractional & 0xe0) >> 5;
}
static void read_fan_from_i2c(struct i2c_client *client, u16 *output,
u8 hi_addr, u8 lo_addr)
{
u8 high_byte, lo_byte;
if (read_u8_from_i2c(client, hi_addr, &high_byte) < 0)
return;
if (read_u8_from_i2c(client, lo_addr, &lo_byte) < 0)
return;
*output = ((u16)high_byte << 5) | (lo_byte >> 3);
}
static void write_fan_target_to_i2c(struct i2c_client *client, u16 new_target)
{
u8 high_byte = (new_target & 0x1fe0) >> 5;
u8 low_byte = (new_target & 0x001f) << 3;
i2c_smbus_write_byte_data(client, REG_FAN_TARGET_LO, low_byte);
i2c_smbus_write_byte_data(client, REG_FAN_TARGET_HI, high_byte);
}
static void read_fan_config_from_i2c(struct i2c_client *client)
{
struct emc2103_data *data = i2c_get_clientdata(client);
u8 conf1;
if (read_u8_from_i2c(client, REG_FAN_CONF1, &conf1) < 0)
return;
data->fan_multiplier = 1 << ((conf1 & 0x60) >> 5);
data->fan_rpm_control = (conf1 & 0x80) != 0;
}
static struct emc2103_data *emc2103_update_device(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct emc2103_data *data = i2c_get_clientdata(client);
mutex_lock(&data->update_lock);
if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
|| !data->valid) {
int i;
for (i = 0; i < data->temp_count; i++) {
read_temp_from_i2c(client, REG_TEMP[i], &data->temp[i]);
read_u8_from_i2c(client, REG_TEMP_MIN[i],
&data->temp_min[i]);
read_u8_from_i2c(client, REG_TEMP_MAX[i],
&data->temp_max[i]);
}
read_u8_from_i2c(client, REG_TEMP_MIN_ALARM,
&data->temp_min_alarm);
read_u8_from_i2c(client, REG_TEMP_MAX_ALARM,
&data->temp_max_alarm);
read_fan_from_i2c(client, &data->fan_tach,
REG_FAN_TACH_HI, REG_FAN_TACH_LO);
read_fan_from_i2c(client, &data->fan_target,
REG_FAN_TARGET_HI, REG_FAN_TARGET_LO);
read_fan_config_from_i2c(client);
data->last_updated = jiffies;
data->valid = true;
}
mutex_unlock(&data->update_lock);
return data;
}
static ssize_t
show_temp(struct device *dev, struct device_attribute *da, char *buf)
{
int nr = to_sensor_dev_attr(da)->index;
struct emc2103_data *data = emc2103_update_device(dev);
int millidegrees = data->temp[nr].degrees * 1000
+ data->temp[nr].fraction * 125;
return sprintf(buf, "%d\n", millidegrees);
}
static ssize_t
show_temp_min(struct device *dev, struct device_attribute *da, char *buf)
{
int nr = to_sensor_dev_attr(da)->index;
struct emc2103_data *data = emc2103_update_device(dev);
int millidegrees = data->temp_min[nr] * 1000;
return sprintf(buf, "%d\n", millidegrees);
}
static ssize_t
show_temp_max(struct device *dev, struct device_attribute *da, char *buf)
{
int nr = to_sensor_dev_attr(da)->index;
struct emc2103_data *data = emc2103_update_device(dev);
int millidegrees = data->temp_max[nr] * 1000;
return sprintf(buf, "%d\n", millidegrees);
}
static ssize_t
show_temp_fault(struct device *dev, struct device_attribute *da, char *buf)
{
int nr = to_sensor_dev_attr(da)->index;
struct emc2103_data *data = emc2103_update_device(dev);
bool fault = (data->temp[nr].degrees == -128);
return sprintf(buf, "%d\n", fault ? 1 : 0);
}
static ssize_t
show_temp_min_alarm(struct device *dev, struct device_attribute *da, char *buf)
{
int nr = to_sensor_dev_attr(da)->index;
struct emc2103_data *data = emc2103_update_device(dev);
bool alarm = data->temp_min_alarm & (1 << nr);
return sprintf(buf, "%d\n", alarm ? 1 : 0);
}
static ssize_t
show_temp_max_alarm(struct device *dev, struct device_attribute *da, char *buf)
{
int nr = to_sensor_dev_attr(da)->index;
struct emc2103_data *data = emc2103_update_device(dev);
bool alarm = data->temp_max_alarm & (1 << nr);
return sprintf(buf, "%d\n", alarm ? 1 : 0);
}
static ssize_t set_temp_min(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
int nr = to_sensor_dev_attr(da)->index;
struct i2c_client *client = to_i2c_client(dev);
struct emc2103_data *data = i2c_get_clientdata(client);
long val;
int result = strict_strtol(buf, 10, &val);
if (result < 0)
return -EINVAL;
val = DIV_ROUND_CLOSEST(val, 1000);
if ((val < -63) || (val > 127))
return -EINVAL;
mutex_lock(&data->update_lock);
data->temp_min[nr] = val;
i2c_smbus_write_byte_data(client, REG_TEMP_MIN[nr], val);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t set_temp_max(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
int nr = to_sensor_dev_attr(da)->index;
struct i2c_client *client = to_i2c_client(dev);
struct emc2103_data *data = i2c_get_clientdata(client);
long val;
int result = strict_strtol(buf, 10, &val);
if (result < 0)
return -EINVAL;
val = DIV_ROUND_CLOSEST(val, 1000);
if ((val < -63) || (val > 127))
return -EINVAL;
mutex_lock(&data->update_lock);
data->temp_max[nr] = val;
i2c_smbus_write_byte_data(client, REG_TEMP_MAX[nr], val);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t
show_fan(struct device *dev, struct device_attribute *da, char *buf)
{
struct emc2103_data *data = emc2103_update_device(dev);
int rpm = 0;
if (data->fan_tach != 0)
rpm = (FAN_RPM_FACTOR * data->fan_multiplier) / data->fan_tach;
return sprintf(buf, "%d\n", rpm);
}
static ssize_t
show_fan_div(struct device *dev, struct device_attribute *da, char *buf)
{
struct emc2103_data *data = emc2103_update_device(dev);
int fan_div = 8 / data->fan_multiplier;
return sprintf(buf, "%d\n", fan_div);
}
/* Note: we also update the fan target here, because its value is
determined in part by the fan clock divider. This follows the principle
of least surprise; the user doesn't expect the fan target to change just
because the divider changed. */
static ssize_t set_fan_div(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
struct emc2103_data *data = emc2103_update_device(dev);
struct i2c_client *client = to_i2c_client(dev);
int new_range_bits, old_div = 8 / data->fan_multiplier;
long new_div;
int status = strict_strtol(buf, 10, &new_div);
if (status < 0)
return -EINVAL;
if (new_div == old_div) /* No change */
return count;
switch (new_div) {
case 1:
new_range_bits = 3;
break;
case 2:
new_range_bits = 2;
break;
case 4:
new_range_bits = 1;
break;
case 8:
new_range_bits = 0;
break;
default:
return -EINVAL;
}
mutex_lock(&data->update_lock);
status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1);
if (status < 0) {
dev_dbg(&client->dev, "reg 0x%02x, err %d\n",
REG_FAN_CONF1, status);
mutex_unlock(&data->update_lock);
return -EIO;
}
status &= 0x9F;
status |= (new_range_bits << 5);
i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status);
data->fan_multiplier = 8 / new_div;
/* update fan target if high byte is not disabled */
if ((data->fan_target & 0x1fe0) != 0x1fe0) {
u16 new_target = (data->fan_target * old_div) / new_div;
data->fan_target = min(new_target, (u16)0x1fff);
write_fan_target_to_i2c(client, data->fan_target);
}
/* invalidate data to force re-read from hardware */
data->valid = false;
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t
show_fan_target(struct device *dev, struct device_attribute *da, char *buf)
{
struct emc2103_data *data = emc2103_update_device(dev);
int rpm = 0;
/* high byte of 0xff indicates disabled so return 0 */
if ((data->fan_target != 0) && ((data->fan_target & 0x1fe0) != 0x1fe0))
rpm = (FAN_RPM_FACTOR * data->fan_multiplier)
/ data->fan_target;
return sprintf(buf, "%d\n", rpm);
}
static ssize_t set_fan_target(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
struct emc2103_data *data = emc2103_update_device(dev);
struct i2c_client *client = to_i2c_client(dev);
long rpm_target;
int result = strict_strtol(buf, 10, &rpm_target);
if (result < 0)
return -EINVAL;
/* Datasheet states 16384 as maximum RPM target (table 3.2) */
if ((rpm_target < 0) || (rpm_target > 16384))
return -EINVAL;
mutex_lock(&data->update_lock);
if (rpm_target == 0)
data->fan_target = 0x1fff;
else
data->fan_target = SENSORS_LIMIT(
(FAN_RPM_FACTOR * data->fan_multiplier) / rpm_target,
0, 0x1fff);
write_fan_target_to_i2c(client, data->fan_target);
mutex_unlock(&data->update_lock);
return count;
}
static ssize_t
show_fan_fault(struct device *dev, struct device_attribute *da, char *buf)
{
struct emc2103_data *data = emc2103_update_device(dev);
bool fault = ((data->fan_tach & 0x1fe0) == 0x1fe0);
return sprintf(buf, "%d\n", fault ? 1 : 0);
}
static ssize_t
show_pwm_enable(struct device *dev, struct device_attribute *da, char *buf)
{
struct emc2103_data *data = emc2103_update_device(dev);
return sprintf(buf, "%d\n", data->fan_rpm_control ? 3 : 0);
}
static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *da,
const char *buf, size_t count)
{
struct i2c_client *client = to_i2c_client(dev);
struct emc2103_data *data = i2c_get_clientdata(client);
long new_value;
u8 conf_reg;
int result = strict_strtol(buf, 10, &new_value);
if (result < 0)
return -EINVAL;
mutex_lock(&data->update_lock);
switch (new_value) {
case 0:
data->fan_rpm_control = false;
break;
case 3:
data->fan_rpm_control = true;
break;
default:
mutex_unlock(&data->update_lock);
return -EINVAL;
}
read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg);
if (data->fan_rpm_control)
conf_reg |= 0x80;
else
conf_reg &= ~0x80;
i2c_smbus_write_byte_data(client, REG_FAN_CONF1, conf_reg);
mutex_unlock(&data->update_lock);
return count;
}
static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO | S_IWUSR, show_temp_min,
set_temp_min, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp_max,
set_temp_max, 0);
static SENSOR_DEVICE_ATTR(temp1_fault, S_IRUGO, show_temp_fault, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_temp_min_alarm,
NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_temp_max_alarm,
NULL, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO | S_IWUSR, show_temp_min,
set_temp_min, 1);
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR, show_temp_max,
set_temp_max, 1);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_temp_fault, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_temp_min_alarm,
NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_temp_max_alarm,
NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO | S_IWUSR, show_temp_min,
set_temp_min, 2);
static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO | S_IWUSR, show_temp_max,
set_temp_max, 2);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_temp_fault, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_temp_min_alarm,
NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_temp_max_alarm,
NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO | S_IWUSR, show_temp_min,
set_temp_min, 3);
static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO | S_IWUSR, show_temp_max,
set_temp_max, 3);
static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_temp_fault, NULL, 3);
static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_temp_min_alarm,
NULL, 3);
static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_temp_max_alarm,
NULL, 3);
static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL);
static DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR, show_fan_div, set_fan_div);
static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_fan_target,
set_fan_target);
static DEVICE_ATTR(fan1_fault, S_IRUGO, show_fan_fault, NULL);
static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR, show_pwm_enable,
set_pwm_enable);
/* sensors present on all models */
static struct attribute *emc2103_attributes[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_min.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_fault.dev_attr.attr,
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_input.dev_attr.attr,
&sensor_dev_attr_temp2_min.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
&dev_attr_fan1_input.attr,
&dev_attr_fan1_div.attr,
&dev_attr_fan1_target.attr,
&dev_attr_fan1_fault.attr,
&dev_attr_pwm1_enable.attr,
NULL
};
/* extra temperature sensors only present on 2103-2 and 2103-4 */
static struct attribute *emc2103_attributes_temp3[] = {
&sensor_dev_attr_temp3_input.dev_attr.attr,
&sensor_dev_attr_temp3_min.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
NULL
};
/* extra temperature sensors only present on 2103-2 and 2103-4 in APD mode */
static struct attribute *emc2103_attributes_temp4[] = {
&sensor_dev_attr_temp4_input.dev_attr.attr,
&sensor_dev_attr_temp4_min.dev_attr.attr,
&sensor_dev_attr_temp4_max.dev_attr.attr,
&sensor_dev_attr_temp4_fault.dev_attr.attr,
&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
NULL
};
static const struct attribute_group emc2103_group = {
.attrs = emc2103_attributes,
};
static const struct attribute_group emc2103_temp3_group = {
.attrs = emc2103_attributes_temp3,
};
static const struct attribute_group emc2103_temp4_group = {
.attrs = emc2103_attributes_temp4,
};
static int
emc2103_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
struct emc2103_data *data;
int status;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -EIO;
data = kzalloc(sizeof(struct emc2103_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
/* 2103-2 and 2103-4 have 3 external diodes, 2103-1 has 1 */
status = i2c_smbus_read_byte_data(client, REG_PRODUCT_ID);
if (status == 0x24) {
/* 2103-1 only has 1 external diode */
data->temp_count = 2;
} else {
/* 2103-2 and 2103-4 have 3 or 4 external diodes */
status = i2c_smbus_read_byte_data(client, REG_CONF1);
if (status < 0) {
dev_dbg(&client->dev, "reg 0x%02x, err %d\n", REG_CONF1,
status);
goto exit_free;
}
/* detect current state of hardware */
data->temp_count = (status & 0x01) ? 4 : 3;
/* force APD state if module parameter is set */
if (apd == 0) {
/* force APD mode off */
data->temp_count = 3;
status &= ~(0x01);
i2c_smbus_write_byte_data(client, REG_CONF1, status);
} else if (apd == 1) {
/* force APD mode on */
data->temp_count = 4;
status |= 0x01;
i2c_smbus_write_byte_data(client, REG_CONF1, status);
}
}
/* Register sysfs hooks */
status = sysfs_create_group(&client->dev.kobj, &emc2103_group);
if (status)
goto exit_free;
if (data->temp_count >= 3) {
status = sysfs_create_group(&client->dev.kobj,
&emc2103_temp3_group);
if (status)
goto exit_remove;
}
if (data->temp_count == 4) {
status = sysfs_create_group(&client->dev.kobj,
&emc2103_temp4_group);
if (status)
goto exit_remove_temp3;
}
data->hwmon_dev = hwmon_device_register(&client->dev);
if (IS_ERR(data->hwmon_dev)) {
status = PTR_ERR(data->hwmon_dev);
goto exit_remove_temp4;
}
dev_info(&client->dev, "%s: sensor '%s'\n",
dev_name(data->hwmon_dev), client->name);
return 0;
exit_remove_temp4:
if (data->temp_count == 4)
sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group);
exit_remove_temp3:
if (data->temp_count >= 3)
sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group);
exit_remove:
sysfs_remove_group(&client->dev.kobj, &emc2103_group);
exit_free:
kfree(data);
return status;
}
static int emc2103_remove(struct i2c_client *client)
{
struct emc2103_data *data = i2c_get_clientdata(client);
hwmon_device_unregister(data->hwmon_dev);
if (data->temp_count == 4)
sysfs_remove_group(&client->dev.kobj, &emc2103_temp4_group);
if (data->temp_count >= 3)
sysfs_remove_group(&client->dev.kobj, &emc2103_temp3_group);
sysfs_remove_group(&client->dev.kobj, &emc2103_group);
kfree(data);
return 0;
}
static const struct i2c_device_id emc2103_ids[] = {
{ "emc2103", 0, },
{ /* LIST END */ }
};
MODULE_DEVICE_TABLE(i2c, emc2103_ids);
/* Return 0 if detection is successful, -ENODEV otherwise */
static int
emc2103_detect(struct i2c_client *new_client, struct i2c_board_info *info)
{
struct i2c_adapter *adapter = new_client->adapter;
int manufacturer, product;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
manufacturer = i2c_smbus_read_byte_data(new_client, REG_MFG_ID);
if (manufacturer != 0x5D)
return -ENODEV;
product = i2c_smbus_read_byte_data(new_client, REG_PRODUCT_ID);
if ((product != 0x24) && (product != 0x26))
return -ENODEV;
strlcpy(info->type, "emc2103", I2C_NAME_SIZE);
return 0;
}
static struct i2c_driver emc2103_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "emc2103",
},
.probe = emc2103_probe,
.remove = emc2103_remove,
.id_table = emc2103_ids,
.detect = emc2103_detect,
.address_list = normal_i2c,
};
static int __init sensors_emc2103_init(void)
{
return i2c_add_driver(&emc2103_driver);
}
static void __exit sensors_emc2103_exit(void)
{
i2c_del_driver(&emc2103_driver);
}
MODULE_AUTHOR("Steve Glendinning <steve.glendinning@smsc.com>");
MODULE_DESCRIPTION("SMSC EMC2103 hwmon driver");
MODULE_LICENSE("GPL");
module_init(sensors_emc2103_init);
module_exit(sensors_emc2103_exit);