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hwmon: (lm90) Add support for ADT7421 

ADT7421 is similar to ADT7461A but supports configurable Beta Compensation.
Packet Error Checking (PEC) is supported but undocumented.

A devicetree node is not added for the added chip since it is quite
unlikely that such an old chip will ever be used in a devicetree based
system. It can be added later if needed.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2021-12-15 19:58:01 -08:00
parent d8521f82df
commit 41e6d7215d
1 changed files with 9 additions and 1 deletions
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10
drivers/hwmon/lm90.c
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@ -231,6 +231,7 @@ static const struct i2c_device_id lm90_id[] = {
{ "adm1021", max1617 }, { "adm1021", max1617 },
{ "adm1023", adm1023 }, { "adm1023", adm1023 },
{ "adm1032", adm1032 }, { "adm1032", adm1032 },
{ "adt7421", adt7461a },
{ "adt7461", adt7461 }, { "adt7461", adt7461 },
{ "adt7461a", adt7461a }, { "adt7461a", adt7461a },
{ "adt7481", adt7481 }, { "adt7481", adt7481 },
@ -1818,11 +1819,18 @@ static const char *lm90_detect_analog(struct i2c_client *client, bool common_add
return NULL; return NULL;
switch (chip_id) { switch (chip_id) {
case 0x00 ... 0x0f: /* ADM1021, undocumented */ case 0x00 ... 0x03: /* ADM1021 */
case 0x05 ... 0x0f:
if (man_id2 == 0x00 && chip_id2 == 0x00 && common_address && if (man_id2 == 0x00 && chip_id2 == 0x00 && common_address &&
!(status & 0x03) && !(config1 & 0x3f) && !(convrate & 0xf8)) !(status & 0x03) && !(config1 & 0x3f) && !(convrate & 0xf8))
name = "adm1021"; name = "adm1021";
break; break;
case 0x04: /* ADT7421 (undocumented) */
if (man_id2 == 0x41 && chip_id2 == 0x21 &&
(address == 0x4c || address == 0x4d) &&
(config1 & 0x0b) == 0x08 && convrate <= 0x0a)
name = "adt7421";
break;
case 0x30 ... 0x3e: /* ADM1021A, ADM1023 */ case 0x30 ... 0x3e: /* ADM1021A, ADM1023 */
/* /*
* ADM1021A and compatible chips will be mis-detected as * ADM1021A and compatible chips will be mis-detected as