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hwmon: (lm95241) Add support for fault attributes

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The chip reports if remote diodes are present, which can be used for
the fault attrributes.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2016-07-04 06:46:31 -07:00
parent f48ccb26e2
commit 090a7f8efe
1 changed files with 19 additions and 1 deletions
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20
drivers/hwmon/lm95241.c
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@ -70,6 +70,8 @@ static const unsigned short normal_i2c[] = {
#define R2DF_MASK (0x01 << (R2DF_SHIFT))
#define R1FE_MASK 0x01
#define R2FE_MASK 0x05
#define R1DM 0x01
#define R2DM 0x02
#define TT1_SHIFT 0
#define TT2_SHIFT 4
#define TT_OFF 0
@ -97,7 +99,7 @@ struct lm95241_data {
char valid; /* zero until following fields are valid */
/* registers values */
u8 temp[ARRAY_SIZE(lm95241_reg_address)];
u8 config, model, trutherm;
u8 status, config, model, trutherm;
};
/* Conversions */
@ -130,6 +132,9 @@ static struct lm95241_data *lm95241_update_device(struct device *dev)
data->temp[i]
= i2c_smbus_read_byte_data(client,
lm95241_reg_address[i]);
data->status = i2c_smbus_read_byte_data(client,
LM95241_REG_R_STATUS);
data->last_updated = jiffies;
data->valid = 1;
}
@ -274,6 +279,15 @@ static ssize_t set_max(struct device *dev, struct device_attribute *attr,
return count;
}
static ssize_t show_fault(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct lm95241_data *data = lm95241_update_device(dev);
return snprintf(buf, PAGE_SIZE - 1, "%d",
!!(data->status & to_sensor_dev_attr(attr)->index));
}
static ssize_t show_interval(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -335,6 +349,8 @@ static SENSOR_DEVICE_ATTR(temp2_max, S_IWUSR | S_IRUGO, show_max, set_max,
R1DF_MASK);
static SENSOR_DEVICE_ATTR(temp3_max, S_IWUSR | S_IRUGO, show_max, set_max,
R2DF_MASK);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_fault, NULL, R1DM);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_fault, NULL, R2DM);
static DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, show_interval,
set_interval);
@ -348,6 +364,8 @@ static struct attribute *lm95241_attrs[] = {
&sensor_dev_attr_temp3_min.dev_attr.attr,
&sensor_dev_attr_temp2_max.dev_attr.attr,
&sensor_dev_attr_temp3_max.dev_attr.attr,
&sensor_dev_attr_temp2_fault.dev_attr.attr,
&sensor_dev_attr_temp3_fault.dev_attr.attr,
&dev_attr_update_interval.attr,
NULL
};