hwmon: (it87) Add chassis intrusion detection support

Add chassis intrusion detection support for all supported devices, using the standard interface. Signed-off-by: Jean Delvare <khali@linux-fr.org>

hwmon: (it87) Add chassis intrusion detection support
Add chassis intrusion detection support for all supported devices, using the standard interface. Signed-off-by: Jean Delvare <khali@linux-fr.org>
Jean Delvare · Jean Delvare
1 parent 764e043bb4
Showing 2 changed files with 31 additions and 1 deletions Side-by-side Diff
Documentation/hwmon/it87
drivers/hwmon/it87.c
@@ -76,7 +76,8 @@
 These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
 joysticks and other miscellaneous stuff. For hardware monitoring, they
 include an 'environment controller' with 3 temperature sensors, 3 fan
-rotation speed sensors, 8 voltage sensors, and associated alarms.
+rotation speed sensors, 8 voltage sensors, associated alarms, and chassis
+intrusion detection.
  
 The IT8712F and IT8716F additionally feature VID inputs, used to report
 the Vcore voltage of the processor. The early IT8712F have 5 VID pins,
@@ -1172,6 +1172,32 @@
 	struct it87_data *data = it87_update_device(dev);
 	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 }
+
+static ssize_t clear_intrusion(struct device *dev, struct device_attribute
+		*attr, const char *buf, size_t count)
+{
+	struct it87_data *data = dev_get_drvdata(dev);
+	long val;
+	int config;
+
+	if (strict_strtol(buf, 10, &val) < 0 || val != 0)
+		return -EINVAL;
+
+	mutex_lock(&data->update_lock);
+	config = it87_read_value(data, IT87_REG_CONFIG);
+	if (config < 0) {
+		count = config;
+	} else {
+		config |= 1 << 5;
+		it87_write_value(data, IT87_REG_CONFIG, config);
+		/* Invalidate cache to force re-read */
+		data->valid = 0;
+	}
+	mutex_unlock(&data->update_lock);
+
+	return count;
+}
+
 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 8);
 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 9);
 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 10);
@@ -1188,6 +1214,8 @@
 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 16);
 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 17);
 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 18);
+static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO | S_IWUSR,
+			  show_alarm, clear_intrusion, 4);
  
 static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
 		char *buf)
@@ -1350,6 +1378,7 @@
 	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
  
 	&dev_attr_alarms.attr,
+	&sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
 	&dev_attr_name.attr,
 	NULL
 };
...	...	@@ -76,7 +76,8 @@
76	76	These chips are 'Super I/O chips', supporting floppy disks, infrared ports,
77	77	joysticks and other miscellaneous stuff. For hardware monitoring, they
78	78	include an 'environment controller' with 3 temperature sensors, 3 fan
79		-rotation speed sensors, 8 voltage sensors, and associated alarms.
	79	+rotation speed sensors, 8 voltage sensors, associated alarms, and chassis
	80	+intrusion detection.
80	81
81	82	The IT8712F and IT8716F additionally feature VID inputs, used to report
82	83	the Vcore voltage of the processor. The early IT8712F have 5 VID pins,
...	...	@@ -1172,6 +1172,32 @@
1172	1172	struct it87_data *data = it87_update_device(dev);
1173	1173	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
1174	1174	}
	1175	+
	1176	+static ssize_t clear_intrusion(struct device *dev, struct device_attribute
	1177	+ attr, const char buf, size_t count)
	1178	+{
	1179	+ struct it87_data *data = dev_get_drvdata(dev);
	1180	+ long val;
	1181	+ int config;
	1182	+
	1183	+ if (strict_strtol(buf, 10, &val) < 0 \|\| val != 0)
	1184	+ return -EINVAL;
	1185	+
	1186	+ mutex_lock(&data->update_lock);
	1187	+ config = it87_read_value(data, IT87_REG_CONFIG);
	1188	+ if (config < 0) {
	1189	+ count = config;
	1190	+ } else {
	1191	+ config \|= 1 << 5;
	1192	+ it87_write_value(data, IT87_REG_CONFIG, config);
	1193	+ /* Invalidate cache to force re-read */
	1194	+ data->valid = 0;
	1195	+ }
	1196	+ mutex_unlock(&data->update_lock);
	1197	+
	1198	+ return count;
	1199	+}
	1200	+
1175	1201	static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 8);
1176	1202	static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 9);
1177	1203	static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 10);
...	...	@@ -1188,6 +1214,8 @@
1188	1214	static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 16);
1189	1215	static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 17);
1190	1216	static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 18);
	1217	+static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IRUGO \| S_IWUSR,
	1218	+ show_alarm, clear_intrusion, 4);
1191	1219
1192	1220	static ssize_t show_beep(struct device dev, struct device_attribute attr,
1193	1221	char *buf)
...	...	@@ -1350,6 +1378,7 @@
1350	1378	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
1351	1379
1352	1380	&dev_attr_alarms.attr,
	1381	+ &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
1353	1382	&dev_attr_name.attr,
1354	1383	NULL
1355	1384	};