hwmon: (lm90): Add support for NCT7716, NCT7717 and NCT7718

NCT7716 is similar to NCT7717 but has one more address support,
both of them only have a 8 bit resolution local thermal sensor.

NCT7718 has 11 bit resoulution remote thermal sensor.

Signed-off-by: Ming Yu <a0282524688@gmail.com>
Link: https://lore.kernel.org/r/20250117100744.1571385-2-a0282524688@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/Documentation/hwmon/lm90.rst b/Documentation/hwmon/lm90.rst
index 23af17a0ab442da9e3882fcbe0c0d0f325e4bad5..98452eed16d5268b6650603e340314b1c8bdf55a 100644 (file)
--- a/Documentation/hwmon/lm90.rst
+++ b/Documentation/hwmon/lm90.rst
@@ -365,6 +365,34 @@ Supported chips:
 
     Datasheet: Not publicly available, can be requested from Nuvoton
 
+  * Nuvoton NCT7716
+
+    Prefix: 'nct7716'
+
+    Addresses scanned: I2C 0x48, 0x49
+
+    Datasheet: Not publicly available, can be requested from Nuvoton
+
+  * Nuvoton NCT7717
+
+    Prefix: 'nct7717'
+
+    Addresses scanned: I2C 0x48
+
+    Datasheet: Publicly available at Nuvoton website
+
+               https://www.nuvoton.com/resource-files/Nuvoton_NCT7717U_Datasheet_V111.pdf
+
+  * Nuvoton NCT7718
+
+    Prefix: 'nct7718'
+
+    Addresses scanned: I2C 0x4c
+
+    Datasheet: Publicly available at Nuvoton website
+
+               https://www.nuvoton.com/resource-files/Nuvoton_NCT7718W_Datasheet_V11.pdf
+
   * Philips/NXP SA56004X
 
     Prefix: 'sa56004'
@@ -573,6 +601,21 @@ W83L771AWG/ASG
   * The AWG and ASG variants only differ in package format.
   * Diode ideality factor configuration (remote sensor) at 0xE3
 
+NCT7716:
+  * 8 bit sensor resolution
+  * Selectable address
+  * Configurable conversion rate
+
+NCT7717:
+  * 8 bit sensor resolution
+  * Configurable conversion rate
+
+NCT7718:
+  * Temperature offset register for remote temperature sensor
+  * 11 bit resolution for remote temperature sensor
+  * Low temperature limits
+  * Configurable conversion rate
+
 SA56004X:
   * Better local resolution
 

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 4cbaba15d86ef46a27838ce96c59ecfdce60acf7..f114d0c55d7831fc5d914d19a6e543cb2dbb5659 100644 (file)
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -1519,7 +1519,7 @@ config SENSORS_LM90
          MAX6657, MAX6658, MAX6659, MAX6680, MAX6681, MAX6692, MAX6695,
          MAX6696,
          ON Semiconductor NCT1008, NCT210, NCT72, NCT214, NCT218,
-         Winbond/Nuvoton W83L771W/G/AWG/ASG,
+         Winbond/Nuvoton W83L771W/G/AWG/ASG, NCT7716, NCT7717 and NCT7718,
          Philips NE1618, SA56004, GMT G781, Texas Instruments TMP451 and TMP461
          sensor chips.
 

diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 511d95a0efb36ae1f409fb6319eb1f6e5436c375..75f09553fd67357a8e3d80cd1b8472eef4a5d0f4 100644 (file)
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -90,6 +90,9 @@
  * This driver also supports NE1618 from Philips. It is similar to NE1617
  * but supports 11 bit external temperature values.
  *
+ * This driver also supports NCT7716, NCT7717 and NCT7718 from Nuvoton.
+ * The NCT7716 is similar to NCT7717 but has one more address support.
+ *
  * Since the LM90 was the first chipset supported by this driver, most
  * comments will refer to this chipset, but are actually general and
  * concern all supported chipsets, unless mentioned otherwise.
@@ -119,13 +122,15 @@
  * Address is fully defined internally and cannot be changed except for
  * MAX6659, MAX6680 and MAX6681.
  * LM86, LM89, LM90, LM99, ADM1032, ADM1032-1, ADT7461, ADT7461A, MAX6649,
- * MAX6657, MAX6658, NCT1008 and W83L771 have address 0x4c.
+ * MAX6657, MAX6658, NCT1008, NCT7718 and W83L771 have address 0x4c.
  * ADM1032-2, ADT7461-2, ADT7461A-2, LM89-1, LM99-1, MAX6646, and NCT1008D
  * have address 0x4d.
  * MAX6647 has address 0x4e.
  * MAX6659 can have address 0x4c, 0x4d or 0x4e.
  * MAX6654, MAX6680, and MAX6681 can have address 0x18, 0x19, 0x1a, 0x29,
  * 0x2a, 0x2b, 0x4c, 0x4d or 0x4e.
+ * NCT7716 can have address 0x48 or 0x49.
+ * NCT7717 has address 0x48.
  * SA56004 can have address 0x48 through 0x4F.
  */
 
@@ -136,7 +141,7 @@ static const unsigned short normal_i2c[] = {
 enum chips { adm1023, adm1032, adt7461, adt7461a, adt7481,
        g781, lm84, lm90, lm99,
        max1617, max6642, max6646, max6648, max6654, max6657, max6659, max6680, max6696,
-       nct210, nct72, ne1618, sa56004, tmp451, tmp461, w83l771,
+       nct210, nct72, nct7716, nct7717, nct7718, ne1618, sa56004, tmp451, tmp461, w83l771,
 };
 
 /*
@@ -191,6 +196,9 @@ enum chips { adm1023, adm1032, adt7461, adt7461a, adt7481,
 #define ADT7481_REG_MAN_ID             0x3e
 #define ADT7481_REG_CHIP_ID            0x3d
 
+/* NCT7716/7717/7718 registers */
+#define NCT7716_REG_CHIP_ID            0xFD
+
 /* Device features */
 #define LM90_HAVE_EXTENDED_TEMP        BIT(0)  /* extended temperature support */
 #define LM90_HAVE_OFFSET       BIT(1)  /* temperature offset register  */
@@ -275,6 +283,9 @@ static const struct i2c_device_id lm90_id[] = {
        { "nct214", nct72 },
        { "nct218", nct72 },
        { "nct72", nct72 },
+       { "nct7716", nct7716 },
+       { "nct7717", nct7717 },
+       { "nct7718", nct7718 },
        { "ne1618", ne1618 },
        { "w83l771", w83l771 },
        { "sa56004", sa56004 },
@@ -382,6 +393,18 @@ static const struct of_device_id __maybe_unused lm90_of_match[] = {
                .compatible = "onnn,nct72",
                .data = (void *)nct72
        },
+       {
+               .compatible = "nuvoton,nct7716",
+               .data = (void *)nct7716
+       },
+       {
+               .compatible = "nuvoton,nct7717",
+               .data = (void *)nct7717
+       },
+       {
+               .compatible = "nuvoton,nct7718",
+               .data = (void *)nct7718
+       },
        {
                .compatible = "winbond,w83l771",
                .data = (void *)w83l771
@@ -601,6 +624,26 @@ static const struct lm90_params lm90_params[] = {
                .resolution = 11,
                .max_convrate = 7,
        },
+       [nct7716] = {
+               .flags = LM90_HAVE_ALARMS | LM90_HAVE_CONVRATE,
+               .alert_alarms = 0x40,
+               .resolution = 8,
+               .max_convrate = 8,
+       },
+       [nct7717] = {
+               .flags = LM90_HAVE_ALARMS | LM90_HAVE_CONVRATE,
+               .alert_alarms = 0x40,
+               .resolution = 8,
+               .max_convrate = 8,
+       },
+       [nct7718] = {
+               .flags = LM90_HAVE_OFFSET | LM90_HAVE_REM_LIMIT_EXT | LM90_HAVE_CRIT
+                 | LM90_HAVE_ALARMS | LM90_HAVE_LOW | LM90_HAVE_CONVRATE
+                 | LM90_HAVE_REMOTE_EXT,
+               .alert_alarms = 0x7c,
+               .resolution = 11,
+               .max_convrate = 8,
+       },
        [ne1618] = {
                .flags = LM90_PAUSE_FOR_CONFIG | LM90_HAVE_BROKEN_ALERT
                  | LM90_HAVE_LOW | LM90_HAVE_CONVRATE | LM90_HAVE_REMOTE_EXT,
@@ -2300,6 +2343,38 @@ static const char *lm90_detect_nuvoton(struct i2c_client *client, int chip_id,
        return name;
 }
 
+static const char *lm90_detect_nuvoton_50(struct i2c_client *client, int chip_id,
+                                         int config1, int convrate)
+{
+       int chip_id2 = i2c_smbus_read_byte_data(client, NCT7716_REG_CHIP_ID);
+       int config2 = i2c_smbus_read_byte_data(client, LM90_REG_CONFIG2);
+       int address = client->addr;
+       const char *name = NULL;
+
+       if (chip_id2 < 0 || config2 < 0)
+               return NULL;
+
+       if (chip_id2 != 0x50 || convrate > 0x08)
+               return NULL;
+
+       switch (chip_id) {
+       case 0x90:
+               if (address == 0x48 && !(config1 & 0x3e) && !(config2 & 0xfe))
+                       name = "nct7717";
+               break;
+       case 0x91:
+               if ((address == 0x48 || address == 0x49) && !(config1 & 0x3e) &&
+                   !(config2 & 0xfe))
+                       name = "nct7716";
+               else if (address == 0x4c && !(config1 & 0x38) && !(config2 & 0xf8))
+                       name = "nct7718";
+               break;
+       default:
+               break;
+       }
+       return name;
+}
+
 static const char *lm90_detect_nxp(struct i2c_client *client, bool common_address,
                                   int chip_id, int config1, int convrate)
 {
@@ -2484,6 +2559,9 @@ static int lm90_detect(struct i2c_client *client, struct i2c_board_info *info)
                name = lm90_detect_maxim(client, common_address, chip_id,
                                         config1, convrate);
                break;
+       case 0x50:
+               name = lm90_detect_nuvoton_50(client, chip_id, config1, convrate);
+               break;
        case 0x54:      /* ON MC1066, Microchip TC1068, TCM1617 (originally TelCom) */
                if (common_address && !(config1 & 0x3f) && !(convrate & 0xf8))
                        name = "mc1066";