hwmon: (nct6775) Detect and report additional temperature sources

Scan all temperature sources used for fan control and report if additional
monitoring registers are available.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 33 insertions, 0 deletions

diff --git a/drivers/hwmon/nct6775.c b/drivers/hwmon/nct6775.c
index f80ff823c28e..6d5859718113 100644
--- a/drivers/hwmon/nct6775.c
+++ b/drivers/hwmon/nct6775.c
@@ -3364,6 +3364,32 @@ nct6775_check_fan_inputs(const struct nct6775_sio_data *sio_data,
         return 0;
 }
 
+static void add_temp_sensors(struct nct6775_data *data, const u16 *regp,
+                             int *available, int *mask)
+{
+        int i;
+        u8 src;
+
+        for (i = 0; i < data->pwm_num && *available; i++) {
+                int index;
+
+                if (!regp[i])
+                        continue;
+                src = nct6775_read_value(data, regp[i]);
+                src &= 0x1f;
+                if (!src || (*mask & (1 << src)))
+                        continue;
+                if (src >= data->temp_label_num ||
+                    !strlen(data->temp_label[src]))
+                        continue;
+
+                index = __ffs(*available);
+                nct6775_write_value(data, data->REG_TEMP_SOURCE[index], src);
+                *available &= ~(1 << index);
+                *mask |= 1 << src;
+        }
+}
+
 static int nct6775_probe(struct platform_device *pdev)
 {
         struct device *dev = &pdev->dev;
@@ -3614,6 +3640,13 @@ static int nct6775_probe(struct platform_device *pdev)
                 mask |= 1 << src;
         }
 
+        /*
+         * Now find unmonitored temperature registers and enable monitoring
+         * if additional monitoring registers are available.
+         */
+        add_temp_sensors(data, data->REG_TEMP_SEL, &available, &mask);
+        add_temp_sensors(data, data->REG_WEIGHT_TEMP_SEL, &available, &mask);
+
         mask = 0;
         s = NUM_TEMP_FIXED;     /* First dynamic temperature attribute */
         for (i = 0; i < num_reg_temp; i++) {