hwmon: (occ) Add new temperature sensor type

The latest version of the On-Chip Controller (OCC) has a different
format for the temperature sensor data. Add a new temperature sensor
version to handle this data.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Link: https://lore.kernel.org/r/20201120010315.190737-4-joel@jms.id.au
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
index a717779..7a5e539 100644 (file)
--- a/drivers/hwmon/occ/common.c
+++ b/drivers/hwmon/occ/common.c
@@ -41,6 +41,14 @@ struct temp_sensor_2 {
        u8 value;
 } __packed;
 
+struct temp_sensor_10 {
+       u32 sensor_id;
+       u8 fru_type;
+       u8 value;
+       u8 throttle;
+       u8 reserved;
+} __packed;
+
 struct freq_sensor_1 {
        u16 sensor_id;
        u16 value;
@@ -307,6 +315,60 @@ static ssize_t occ_show_temp_2(struct device *dev,
        return snprintf(buf, PAGE_SIZE - 1, "%u\n", val);
 }
 
+static ssize_t occ_show_temp_10(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       int rc;
+       u32 val = 0;
+       struct temp_sensor_10 *temp;
+       struct occ *occ = dev_get_drvdata(dev);
+       struct occ_sensors *sensors = &occ->sensors;
+       struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
+
+       rc = occ_update_response(occ);
+       if (rc)
+               return rc;
+
+       temp = ((struct temp_sensor_10 *)sensors->temp.data) + sattr->index;
+
+       switch (sattr->nr) {
+       case 0:
+               val = get_unaligned_be32(&temp->sensor_id);
+               break;
+       case 1:
+               val = temp->value;
+               if (val == OCC_TEMP_SENSOR_FAULT)
+                       return -EREMOTEIO;
+
+               /*
+                * VRM doesn't return temperature, only alarm bit. This
+                * attribute maps to tempX_alarm instead of tempX_input for
+                * VRM
+                */
+               if (temp->fru_type != OCC_FRU_TYPE_VRM) {
+                       /* sensor not ready */
+                       if (val == 0)
+                               return -EAGAIN;
+
+                       val *= 1000;
+               }
+               break;
+       case 2:
+               val = temp->fru_type;
+               break;
+       case 3:
+               val = temp->value == OCC_TEMP_SENSOR_FAULT;
+               break;
+       case 4:
+               val = temp->throttle * 1000;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return snprintf(buf, PAGE_SIZE - 1, "%u\n", val);
+}
+
 static ssize_t occ_show_freq_1(struct device *dev,
                               struct device_attribute *attr, char *buf)
 {
@@ -745,6 +807,10 @@ static int occ_setup_sensor_attrs(struct occ *occ)
                num_attrs += (sensors->temp.num_sensors * 4);
                show_temp = occ_show_temp_2;
                break;
+       case 0x10:
+               num_attrs += (sensors->temp.num_sensors * 5);
+               show_temp = occ_show_temp_10;
+               break;
        default:
                sensors->temp.num_sensors = 0;
        }
@@ -844,6 +910,15 @@ static int occ_setup_sensor_attrs(struct occ *occ)
                        attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
                                                     show_temp, NULL, 3, i);
                        attr++;
+
+                       if (sensors->temp.version == 0x10) {
+                               snprintf(attr->name, sizeof(attr->name),
+                                        "temp%d_max", s);
+                               attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
+                                                            show_temp, NULL,
+                                                            4, i);
+                               attr++;
+                       }
                }
        }