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hwmon: (lm73) Add support for max/min alarms

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Add support for temp1_min_alarm and temp1_max_alarm

Signed-off-by: Chris Verges <kg4ysn@gmail.com>
[linux@roeck-us.net: cleanup; dropped platform data and interrupt support]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Chris Verges 2013-01-05 01:41:20 -08:00 committed by Guenter Roeck
parent 8c14d126ae
commit 2bf9233a10
2 changed files with 43 additions and 0 deletions
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11
Documentation/hwmon/lm73
View File

@ -77,3 +77,14 @@ via the following function:
where 'x' is the output from 'update_interval' and 'g(x)' is the
resolution in degrees C per LSB.
Alarm Support
-------------
The LM73 features a simple over-temperature alarm mechanism. This
feature is exposed via the sysfs attributes.
The attributes 'temp1_max_alarm' and 'temp1_min_alarm' are flags
provided by the LM73 that indicate whether the measured temperature has
passed the 'temp1_max' and 'temp1_min' thresholds, respectively. These
values _must_ be read to clear the registers on the LM73.

32
drivers/hwmon/lm73.c
View File

@ -8,6 +8,7 @@
* Guillaume Ligneul <guillaume.ligneul@gmail.com>
* Adrien Demarez <adrien.demarez@bolloretelecom.eu>
* Jeremy Laine <jeremy.laine@bolloretelecom.eu>
* Chris Verges <kg4ysn@gmail.com>
*
* This software program is licensed subject to the GNU General Public License
* (GPL).Version 2,June 1991, available at
@ -43,6 +44,9 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c,
#define LM73_CTRL_RES_MASK (BIT(5) | BIT(6))
#define LM73_CTRL_TO_MASK BIT(7)
#define LM73_CTRL_HI_SHIFT 2
#define LM73_CTRL_LO_SHIFT 1
static const unsigned short lm73_convrates[] = {
14, /* 11-bits (0.25000 C/LSB): RES1 Bit = 0, RES0 Bit = 0 */
28, /* 12-bits (0.12500 C/LSB): RES1 Bit = 0, RES0 Bit = 1 */
@ -140,6 +144,28 @@ static ssize_t show_convrate(struct device *dev, struct device_attribute *da,
return scnprintf(buf, PAGE_SIZE, "%hu\n", lm73_convrates[res]);
}
static ssize_t show_maxmin_alarm(struct device *dev,
struct device_attribute *da, char *buf)
{
struct i2c_client *client = to_i2c_client(dev);
struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
struct lm73_data *data = i2c_get_clientdata(client);
s32 ctrl;
mutex_lock(&data->lock);
ctrl = i2c_smbus_read_byte_data(client, LM73_REG_CTRL);
if (ctrl < 0)
goto abort;
data->ctrl = ctrl;
mutex_unlock(&data->lock);
return scnprintf(buf, PAGE_SIZE, "%d\n", (ctrl >> attr->index) & 1);
abort:
mutex_unlock(&data->lock);
return ctrl;
}
/*-----------------------------------------------------------------------*/
/* sysfs attributes for hwmon */
@ -152,12 +178,18 @@ static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
show_temp, NULL, LM73_REG_INPUT);
static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO,
show_convrate, set_convrate, 0);
static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO,
show_maxmin_alarm, NULL, LM73_CTRL_HI_SHIFT);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO,
show_maxmin_alarm, NULL, LM73_CTRL_LO_SHIFT);
static struct attribute *lm73_attributes[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
&sensor_dev_attr_temp1_min.dev_attr.attr,
&sensor_dev_attr_update_interval.dev_attr.attr,
&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
NULL
};