hwmon: (pmbus) Add support for peak attributes
Most PMBus devices provide manufacturer specific commands to read low and/or
high peak values for some or all of its sensors.
To support providing those values as lowest/highest attributes to the user,
introduce virtual PMBus commands. Those commands reside outside the normal
command set and have to be implemented in device specific code, which map the
virtual commands to device specific commands.
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Reviewed-by: Robert Coulson <robert.coulson@ericsson.com>
diff --git a/drivers/hwmon/pmbus/pmbus.h b/drivers/hwmon/pmbus/pmbus.h
index ceb71f7..9973d26 100644
--- a/drivers/hwmon/pmbus/pmbus.h
+++ b/drivers/hwmon/pmbus/pmbus.h
@@ -126,6 +126,42 @@
#define PMBUS_MFR_SERIAL 0x9E
/*
+ * Virtual registers.
+ * Useful to support attributes which are not supported by standard PMBus
+ * registers but exist as manufacturer specific registers on individual chips.
+ * Must be mapped to real registers in device specific code.
+ *
+ * Semantics:
+ * Virtual registers are all word size.
+ * READ registers are read-only; writes are either ignored or return an error.
+ * RESET registers are read/write. Reading returns zero (used for detection),
+ * writing any value causes the associated history to be reset.
+ */
+#define PMBUS_VIRT_BASE 0x100
+#define PMBUS_VIRT_READ_TEMP_MIN (PMBUS_VIRT_BASE + 0)
+#define PMBUS_VIRT_READ_TEMP_MAX (PMBUS_VIRT_BASE + 1)
+#define PMBUS_VIRT_RESET_TEMP_HISTORY (PMBUS_VIRT_BASE + 2)
+#define PMBUS_VIRT_READ_VIN_AVG (PMBUS_VIRT_BASE + 3)
+#define PMBUS_VIRT_READ_VIN_MIN (PMBUS_VIRT_BASE + 4)
+#define PMBUS_VIRT_READ_VIN_MAX (PMBUS_VIRT_BASE + 5)
+#define PMBUS_VIRT_RESET_VIN_HISTORY (PMBUS_VIRT_BASE + 6)
+#define PMBUS_VIRT_READ_IIN_AVG (PMBUS_VIRT_BASE + 7)
+#define PMBUS_VIRT_READ_IIN_MIN (PMBUS_VIRT_BASE + 8)
+#define PMBUS_VIRT_READ_IIN_MAX (PMBUS_VIRT_BASE + 9)
+#define PMBUS_VIRT_RESET_IIN_HISTORY (PMBUS_VIRT_BASE + 10)
+#define PMBUS_VIRT_READ_PIN_AVG (PMBUS_VIRT_BASE + 11)
+#define PMBUS_VIRT_READ_PIN_MAX (PMBUS_VIRT_BASE + 12)
+#define PMBUS_VIRT_RESET_PIN_HISTORY (PMBUS_VIRT_BASE + 13)
+#define PMBUS_VIRT_READ_VOUT_AVG (PMBUS_VIRT_BASE + 14)
+#define PMBUS_VIRT_READ_VOUT_MIN (PMBUS_VIRT_BASE + 15)
+#define PMBUS_VIRT_READ_VOUT_MAX (PMBUS_VIRT_BASE + 16)
+#define PMBUS_VIRT_RESET_VOUT_HISTORY (PMBUS_VIRT_BASE + 17)
+#define PMBUS_VIRT_READ_IOUT_AVG (PMBUS_VIRT_BASE + 18)
+#define PMBUS_VIRT_READ_IOUT_MIN (PMBUS_VIRT_BASE + 19)
+#define PMBUS_VIRT_READ_IOUT_MAX (PMBUS_VIRT_BASE + 20)
+#define PMBUS_VIRT_RESET_IOUT_HISTORY (PMBUS_VIRT_BASE + 21)
+
+/*
* CAPABILITY
*/
#define PB_CAPABILITY_SMBALERT (1<<4)
diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index df3971f..9baf119 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -33,14 +33,18 @@
/*
* Constants needed to determine number of sensors, booleans, and labels.
*/
-#define PMBUS_MAX_INPUT_SENSORS 11 /* 6*volt, 3*curr, 2*power */
-#define PMBUS_VOUT_SENSORS_PER_PAGE 5 /* input, min, max, lcrit,
- crit */
-#define PMBUS_IOUT_SENSORS_PER_PAGE 4 /* input, min, max, crit */
+#define PMBUS_MAX_INPUT_SENSORS 22 /* 10*volt, 7*curr, 5*power */
+#define PMBUS_VOUT_SENSORS_PER_PAGE 9 /* input, min, max, lcrit,
+ crit, lowest, highest, avg,
+ reset */
+#define PMBUS_IOUT_SENSORS_PER_PAGE 8 /* input, min, max, crit,
+ lowest, highest, avg,
+ reset */
#define PMBUS_POUT_SENSORS_PER_PAGE 4 /* input, cap, max, crit */
#define PMBUS_MAX_SENSORS_PER_FAN 1 /* input */
-#define PMBUS_MAX_SENSORS_PER_TEMP 5 /* input, min, max, lcrit,
- crit */
+#define PMBUS_MAX_SENSORS_PER_TEMP 8 /* input, min, max, lcrit,
+ crit, lowest, highest,
+ reset */
#define PMBUS_MAX_INPUT_BOOLEANS 7 /* v: min_alarm, max_alarm,
lcrit_alarm, crit_alarm;
@@ -80,7 +84,7 @@
char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */
struct sensor_device_attribute attribute;
u8 page; /* page number */
- u8 reg; /* register */
+ u16 reg; /* register */
enum pmbus_sensor_classes class; /* sensor class */
bool update; /* runtime sensor update needed */
int data; /* Sensor data.
@@ -237,6 +241,8 @@
if (status != -ENODATA)
return status;
}
+ if (reg >= PMBUS_VIRT_BASE)
+ return -EINVAL;
return pmbus_read_word_data(client, page, reg);
}
@@ -318,7 +324,7 @@
int rv;
struct pmbus_data *data = i2c_get_clientdata(client);
- rv = pmbus_read_word_data(client, page, reg);
+ rv = _pmbus_read_word_data(client, page, reg);
if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
rv = pmbus_check_status_cml(client);
pmbus_clear_fault_page(client, -1);
@@ -951,7 +957,8 @@
* and its associated alarm attribute.
*/
struct pmbus_limit_attr {
- u8 reg; /* Limit register */
+ u16 reg; /* Limit register */
+ bool update; /* True if register needs updates */
const char *attr; /* Attribute name */
const char *alarm; /* Alarm attribute name */
u32 sbit; /* Alarm attribute status bit */
@@ -996,9 +1003,10 @@
if (pmbus_check_word_register(client, page, l->reg)) {
cindex = data->num_sensors;
pmbus_add_sensor(data, name, l->attr, index, page,
- l->reg, attr->class, attr->update,
+ l->reg, attr->class,
+ attr->update || l->update,
false);
- if (info->func[page] & attr->sfunc) {
+ if (l->sbit && (info->func[page] & attr->sfunc)) {
if (attr->compare) {
pmbus_add_boolean_cmp(data, name,
l->alarm, index,
@@ -1094,6 +1102,21 @@
.attr = "crit",
.alarm = "crit_alarm",
.sbit = PB_VOLTAGE_OV_FAULT,
+ }, {
+ .reg = PMBUS_VIRT_READ_VIN_AVG,
+ .update = true,
+ .attr = "average",
+ }, {
+ .reg = PMBUS_VIRT_READ_VIN_MIN,
+ .update = true,
+ .attr = "lowest",
+ }, {
+ .reg = PMBUS_VIRT_READ_VIN_MAX,
+ .update = true,
+ .attr = "highest",
+ }, {
+ .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
+ .attr = "reset_history",
},
};
@@ -1118,6 +1141,21 @@
.attr = "crit",
.alarm = "crit_alarm",
.sbit = PB_VOLTAGE_OV_FAULT,
+ }, {
+ .reg = PMBUS_VIRT_READ_VOUT_AVG,
+ .update = true,
+ .attr = "average",
+ }, {
+ .reg = PMBUS_VIRT_READ_VOUT_MIN,
+ .update = true,
+ .attr = "lowest",
+ }, {
+ .reg = PMBUS_VIRT_READ_VOUT_MAX,
+ .update = true,
+ .attr = "highest",
+ }, {
+ .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
+ .attr = "reset_history",
}
};
@@ -1164,6 +1202,21 @@
.attr = "crit",
.alarm = "crit_alarm",
.sbit = PB_IIN_OC_FAULT,
+ }, {
+ .reg = PMBUS_VIRT_READ_IIN_AVG,
+ .update = true,
+ .attr = "average",
+ }, {
+ .reg = PMBUS_VIRT_READ_IIN_MIN,
+ .update = true,
+ .attr = "lowest",
+ }, {
+ .reg = PMBUS_VIRT_READ_IIN_MAX,
+ .update = true,
+ .attr = "highest",
+ }, {
+ .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
+ .attr = "reset_history",
}
};
@@ -1183,6 +1236,21 @@
.attr = "crit",
.alarm = "crit_alarm",
.sbit = PB_IOUT_OC_FAULT,
+ }, {
+ .reg = PMBUS_VIRT_READ_IOUT_AVG,
+ .update = true,
+ .attr = "average",
+ }, {
+ .reg = PMBUS_VIRT_READ_IOUT_MIN,
+ .update = true,
+ .attr = "lowest",
+ }, {
+ .reg = PMBUS_VIRT_READ_IOUT_MAX,
+ .update = true,
+ .attr = "highest",
+ }, {
+ .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
+ .attr = "reset_history",
}
};
@@ -1218,6 +1286,17 @@
.attr = "max",
.alarm = "alarm",
.sbit = PB_PIN_OP_WARNING,
+ }, {
+ .reg = PMBUS_VIRT_READ_PIN_AVG,
+ .update = true,
+ .attr = "average",
+ }, {
+ .reg = PMBUS_VIRT_READ_PIN_MAX,
+ .update = true,
+ .attr = "input_highest",
+ }, {
+ .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
+ .attr = "reset_history",
}
};
@@ -1286,6 +1365,39 @@
.attr = "crit",
.alarm = "crit_alarm",
.sbit = PB_TEMP_OT_FAULT,
+ }, {
+ .reg = PMBUS_VIRT_READ_TEMP_MIN,
+ .attr = "lowest",
+ }, {
+ .reg = PMBUS_VIRT_READ_TEMP_MAX,
+ .attr = "highest",
+ }, {
+ .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
+ .attr = "reset_history",
+ }
+};
+
+static const struct pmbus_limit_attr temp_limit_attrs23[] = {
+ {
+ .reg = PMBUS_UT_WARN_LIMIT,
+ .attr = "min",
+ .alarm = "min_alarm",
+ .sbit = PB_TEMP_UT_WARNING,
+ }, {
+ .reg = PMBUS_UT_FAULT_LIMIT,
+ .attr = "lcrit",
+ .alarm = "lcrit_alarm",
+ .sbit = PB_TEMP_UT_FAULT,
+ }, {
+ .reg = PMBUS_OT_WARN_LIMIT,
+ .attr = "max",
+ .alarm = "max_alarm",
+ .sbit = PB_TEMP_OT_WARNING,
+ }, {
+ .reg = PMBUS_OT_FAULT_LIMIT,
+ .attr = "crit",
+ .alarm = "crit_alarm",
+ .sbit = PB_TEMP_OT_FAULT,
}
};
@@ -1312,8 +1424,8 @@
.sfunc = PMBUS_HAVE_STATUS_TEMP,
.sbase = PB_STATUS_TEMP_BASE,
.gbit = PB_STATUS_TEMPERATURE,
- .limit = temp_limit_attrs,
- .nlimit = ARRAY_SIZE(temp_limit_attrs),
+ .limit = temp_limit_attrs23,
+ .nlimit = ARRAY_SIZE(temp_limit_attrs23),
}, {
.reg = PMBUS_READ_TEMPERATURE_3,
.class = PSC_TEMPERATURE,
@@ -1324,8 +1436,8 @@
.sfunc = PMBUS_HAVE_STATUS_TEMP,
.sbase = PB_STATUS_TEMP_BASE,
.gbit = PB_STATUS_TEMPERATURE,
- .limit = temp_limit_attrs,
- .nlimit = ARRAY_SIZE(temp_limit_attrs),
+ .limit = temp_limit_attrs23,
+ .nlimit = ARRAY_SIZE(temp_limit_attrs23),
}
};