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authorChris Verges <kg4ysn@gmail.com>2013-01-05 13:41:20 +0400
committerGuenter Roeck <linux@roeck-us.net>2013-02-06 21:57:58 +0400
commit2bf9233a108cea32edbb5a65afa8e609fa146577 (patch)
tree7c7f3550fd520786c63d63b1c65f5b5893cd95a0 /drivers/hwmon/lm73.c
parent8c14d126ae2efbcd094b24e5413b8cbe1d2c01e4 (diff)
downloadlinux-2bf9233a108cea32edbb5a65afa8e609fa146577.tar.xz
hwmon: (lm73) Add support for max/min alarms
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>
Diffstat (limited to 'drivers/hwmon/lm73.c')
-rw-r--r--drivers/hwmon/lm73.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/hwmon/lm73.c b/drivers/hwmon/lm73.c
index 0b19f03950e0..9bde9644b102 100644
--- a/drivers/hwmon/lm73.c
+++ b/drivers/hwmon/lm73.c
@@ -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
};