hwmon: (nct6775) Monitor additional temperature registers

The number of SMIOVT registers on NCT6779 and NCT6791 is limited to 2.
As result, the driver may not report some of the temperatures used
for fan control. This can result in some of the pwmX_temp_sel or
pwm2_weight_temp_sel attributes to wrongly return 0.
Fortunately, the chip has registers to monitor those temperatures.
Add them to the list of temperatures to report.

Signed-off-by: Guenter Roeck <[e-mail]>

drivers/hwmon/nct6775.c

···
 static const u16 NCT6775_REG_TEMP[] = {
 	0x27, 0x150, 0x250, 0x62b, 0x62c, 0x62d };
 
+static const u16 NCT6775_REG_TEMP_MON[] = { 0x73, 0x75, 0x77 };
+
 static const u16 NCT6775_REG_TEMP_CONFIG[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
 	0, 0x152, 0x252, 0x628, 0x629, 0x62A };
 static const u16 NCT6775_REG_TEMP_HYST[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
···
 	0x137, 0x237, 0x337, 0x837, 0x937, 0xa37 };
 
 static const u16 NCT6779_REG_TEMP[] = { 0x27, 0x150 };
+static const u16 NCT6779_REG_TEMP_MON[] = { 0x73, 0x75, 0x77, 0x79, 0x7b };
 static const u16 NCT6779_REG_TEMP_CONFIG[ARRAY_SIZE(NCT6779_REG_TEMP)] = {
 	0x18, 0x152 };
 static const u16 NCT6779_REG_TEMP_HYST[ARRAY_SIZE(NCT6779_REG_TEMP)] = {
···
 	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x07, 0x08, 0x09 };
 
 static const u16 NCT6106_REG_TEMP[] = { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15 };
+static const u16 NCT6106_REG_TEMP_MON[] = { 0x18, 0x19, 0x1a };
 static const u16 NCT6106_REG_TEMP_HYST[] = {
 	0xc3, 0xc7, 0xcb, 0xcf, 0xd3, 0xd7 };
 static const u16 NCT6106_REG_TEMP_OVER[] = {
···
 	int i, s, err = 0;
 	int src, mask, available;
 	const u16 *reg_temp, *reg_temp_over, *reg_temp_hyst, *reg_temp_config;
-	const u16 *reg_temp_alternate, *reg_temp_crit;
+	const u16 *reg_temp_mon, *reg_temp_alternate, *reg_temp_crit;
 	const u16 *reg_temp_crit_l = NULL, *reg_temp_crit_h = NULL;
-	int num_reg_temp;
+	int num_reg_temp, num_reg_temp_mon;
 	u8 cr2a;
 	struct attribute_group *group;
 	struct device *hwmon_dev;
···
 		data->BEEP_BITS = NCT6106_BEEP_BITS;
 
 		reg_temp = NCT6106_REG_TEMP;
+		reg_temp_mon = NCT6106_REG_TEMP_MON;
 		num_reg_temp = ARRAY_SIZE(NCT6106_REG_TEMP);
+		num_reg_temp_mon = ARRAY_SIZE(NCT6106_REG_TEMP_MON);
 		reg_temp_over = NCT6106_REG_TEMP_OVER;
 		reg_temp_hyst = NCT6106_REG_TEMP_HYST;
 		reg_temp_config = NCT6106_REG_TEMP_CONFIG;
···
 		data->REG_BEEP = NCT6775_REG_BEEP;
 
 		reg_temp = NCT6775_REG_TEMP;
+		reg_temp_mon = NCT6775_REG_TEMP_MON;
 		num_reg_temp = ARRAY_SIZE(NCT6775_REG_TEMP);
+		num_reg_temp_mon = ARRAY_SIZE(NCT6775_REG_TEMP_MON);
 		reg_temp_over = NCT6775_REG_TEMP_OVER;
 		reg_temp_hyst = NCT6775_REG_TEMP_HYST;
 		reg_temp_config = NCT6775_REG_TEMP_CONFIG;
···
 		data->REG_BEEP = NCT6776_REG_BEEP;
 
 		reg_temp = NCT6775_REG_TEMP;
+		reg_temp_mon = NCT6775_REG_TEMP_MON;
 		num_reg_temp = ARRAY_SIZE(NCT6775_REG_TEMP);
+		num_reg_temp_mon = ARRAY_SIZE(NCT6775_REG_TEMP_MON);
 		reg_temp_over = NCT6775_REG_TEMP_OVER;
 		reg_temp_hyst = NCT6775_REG_TEMP_HYST;
 		reg_temp_config = NCT6776_REG_TEMP_CONFIG;
···
 		data->REG_BEEP = NCT6776_REG_BEEP;
 
 		reg_temp = NCT6779_REG_TEMP;
+		reg_temp_mon = NCT6779_REG_TEMP_MON;
 		num_reg_temp = ARRAY_SIZE(NCT6779_REG_TEMP);
+		num_reg_temp_mon = ARRAY_SIZE(NCT6779_REG_TEMP_MON);
 		reg_temp_over = NCT6779_REG_TEMP_OVER;
 		reg_temp_hyst = NCT6779_REG_TEMP_HYST;
 		reg_temp_config = NCT6779_REG_TEMP_CONFIG;
···
 		data->REG_BEEP = NCT6776_REG_BEEP;
 
 		reg_temp = NCT6779_REG_TEMP;
+		reg_temp_mon = NCT6779_REG_TEMP_MON;
 		num_reg_temp = ARRAY_SIZE(NCT6779_REG_TEMP);
+		num_reg_temp_mon = ARRAY_SIZE(NCT6779_REG_TEMP_MON);
 		reg_temp_over = NCT6779_REG_TEMP_OVER;
 		reg_temp_hyst = NCT6779_REG_TEMP_HYST;
 		reg_temp_config = NCT6779_REG_TEMP_CONFIG;
···
 		if (reg_temp_crit_l && reg_temp_crit_l[i])
 			data->reg_temp[4][s] = reg_temp_crit_l[i];
 
+		data->temp_src[s] = src;
+		s++;
+	}
+
+	/*
+	 * Repeat with temperatures used for fan control.
+	 * This set of registers does not support limits.
+	 */
+	for (i = 0; i < num_reg_temp_mon; i++) {
+		if (reg_temp_mon[i] == 0)
+			continue;
+
+		src = nct6775_read_value(data, data->REG_TEMP_SEL[i]) & 0x1f;
+		if (!src || (mask & (1 << src)))
+			continue;
+
+		if (src >= data->temp_label_num ||
+		    !strlen(data->temp_label[src])) {
+			dev_info(dev,
+				 "Invalid temperature source %d at index %d, source register 0x%x, temp register 0x%x\n",
+				 src, i, data->REG_TEMP_SEL[i],
+				 reg_temp_mon[i]);
+			continue;
+		}
+
+		mask |= 1 << src;
+
+		/* Use fixed index for SYSTIN(1), CPUTIN(2), AUXTIN(3) */
+		if (src <= data->temp_fixed_num) {
+			if (data->have_temp & (1 << (src - 1)))
+				continue;
+			data->have_temp |= 1 << (src - 1);
+			data->have_temp_fixed |= 1 << (src - 1);
+			data->reg_temp[0][src - 1] = reg_temp_mon[i];
+			data->temp_src[src - 1] = src;
+			continue;
+		}
+
+		if (s >= NUM_TEMP)
+			continue;
+
+		/* Use dynamic index for other sources */
+		data->have_temp |= 1 << s;
+		data->reg_temp[0][s] = reg_temp_mon[i];
 		data->temp_src[s] = src;
 		s++;
 	}