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hwmon: (lm90) Add support for ON Semiconductor NCT218

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NCT218 is compatible to NCT72 and NCT214. It also supports PEC (packet
error checking). Similar to NCT72 and NCT214, PEC support is undocumented.

Unlike NCT214 and NCT72, NCT218 does not support the undocumented secondary
chip and manufacturer ID registers at 0x3e and 0x3f and returns 0x00 when
reading those registers. The value for the chip revision register is not
documented but was observed to be 0xca. Use that information to improve
chip detection accuracy.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2021-12-13 11:26:54 -08:00
parent 2c6cb6c557
commit d8521f82df
3 changed files with 40 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
Documentation/hwmon/lm90.rst
View File

@ -157,6 +157,16 @@ Supported chips:
https://www.onsemi.com/PowerSolutions/product.do?id=NCT214
* ON Semiconductor NCT218
Prefix: 'nct218'
Addresses scanned: I2C 0x4c - 0x4d
Datasheet: Publicly available at the ON Semiconductor website
https://www.onsemi.com/PowerSolutions/product.do?id=NCT218
* ON Semiconductor NCT72
Prefix: 'nct72'

2
drivers/hwmon/Kconfig
View File

@ -1365,7 +1365,7 @@ config SENSORS_LM90
Maxim MAX1617, MAX6642, MAX6646, MAX6647, MAX6648, MAX6649, MAX6654,
MAX6657, MAX6658, MAX6659, MAX6680, MAX6681, MAX6692, MAX6695,
MAX6696,
ON Semiconductor NCT1008, NCT210, NCT72, NCT214,
ON Semiconductor NCT1008, NCT210, NCT72, NCT214, NCT218,
Winbond/Nuvoton W83L771W/G/AWG/ASG,
Philips SA56004, GMT G781, Texas Instruments TMP451 and TMP461
sensor chips.

31
drivers/hwmon/lm90.c
View File

@ -69,8 +69,9 @@
* / ON Semiconductor. The chips are similar to ADT7461 but support two external
* temperature sensors.
*
* This driver also supports NCT72 and NCT214 from ON Semiconductor. The chips
* are similar to ADT7461/ADT7461A but have full PEC support (undocumented).
* This driver also supports NCT72, NCT214, and NCT218 from ON Semiconductor.
* The chips are similar to ADT7461/ADT7461A but have full PEC support
* (undocumented).
*
* This driver also supports the SA56004 from Philips. This device is
* pin-compatible with the LM86, the ED/EDP parts are also address-compatible.
@ -262,6 +263,7 @@ static const struct i2c_device_id lm90_id[] = {
{ "nct1008", adt7461a },
{ "nct210", nct210 },
{ "nct214", nct72 },
{ "nct218", nct72 },
{ "nct72", nct72 },
{ "w83l771", w83l771 },
{ "sa56004", sa56004 },
@ -357,6 +359,10 @@ static const struct of_device_id __maybe_unused lm90_of_match[] = {
.compatible = "onnn,nct214",
.data = (void *)nct72
},
{
.compatible = "onnn,nct218",
.data = (void *)nct72
},
{
.compatible = "onnn,nct72",
.data = (void *)nct72
@ -1780,6 +1786,24 @@ static const char *lm90_detect_national(struct i2c_client *client, int chip_id,
return name;
}
static const char *lm90_detect_on(struct i2c_client *client, int chip_id, int config1,
int convrate)
{
int address = client->addr;
const char *name = NULL;
switch (chip_id) {
case 0xca: /* NCT218 */
if ((address == 0x4c || address == 0x4d) && !(config1 & 0x1b) &&
convrate <= 0x0a)
name = "nct218";
break;
default:
break;
}
return name;
}
static const char *lm90_detect_analog(struct i2c_client *client, bool common_address,
int chip_id, int config1, int convrate)
{
@ -2265,6 +2289,9 @@ static int lm90_detect(struct i2c_client *client, struct i2c_board_info *info)
case 0x01: /* National Semiconductor */
name = lm90_detect_national(client, chip_id, config1, convrate);
break;
case 0x1a: /* ON */
name = lm90_detect_on(client, chip_id, config1, convrate);
break;
case 0x23: /* Genesys Logic */
if (common_address && !(config1 & 0x3f) && !(convrate & 0xf8))
name = "gl523sm";