[v1] hwmon: emc1403: Add support for EMC1442

[PATCH v1] hwmon: emc1403: Add support for EMC1442

Posted by Delphine CC Chiu 2 years, 1 month ago

Add support for EMC1442 which is compatible with EMC1403.

Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
---
 drivers/hwmon/emc1403.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c
index bb7c859e799d..c0d2e96c5077 100644
--- a/drivers/hwmon/emc1403.c
+++ b/drivers/hwmon/emc1403.c
@@ -346,6 +346,9 @@ static int emc1403_detect(struct i2c_client *client,
 	case 0x27:
 		strscpy(info->type, "emc1424", I2C_NAME_SIZE);
 		break;
+	case 0x60:
+		strscpy(info->type, "emc1442", I2C_NAME_SIZE);
+		break;
 	default:
 		return -ENODEV;
 	}
@@ -430,7 +433,7 @@ static int emc1403_probe(struct i2c_client *client)
 }
 
 static const unsigned short emc1403_address_list[] = {
-	0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
+	0x18, 0x1c, 0x29, 0x3c, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
 };
 
 /* Last digit of chip name indicates number of channels */
@@ -444,6 +447,7 @@ static const struct i2c_device_id emc1403_idtable[] = {
 	{ "emc1422", emc1402 },
 	{ "emc1423", emc1403 },
 	{ "emc1424", emc1404 },
+	{ "emc1442", emc1403 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
-- 
2.25.1

Re: [PATCH v1] hwmon: emc1403: Add support for EMC1442

Posted by Guenter Roeck 2 years, 1 month ago

On Tue, Oct 31, 2023 at 04:58:06PM +0800, Delphine CC Chiu wrote:
> Add support for EMC1442 which is compatible with EMC1403.
> 

Unfortunately, almost no information is available about this chip
except that it ships in an 8-pin package. Are you sure the chip
supports two external temperature sensors like EMC1403 ?
The chip numbering and the number of pins would suggest that
it only supports a single external temperature sensor,
which would make it compatible to emc1402/emc1422.

Guenter

> Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
> ---
>  drivers/hwmon/emc1403.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/emc1403.c b/drivers/hwmon/emc1403.c
> index bb7c859e799d..c0d2e96c5077 100644
> --- a/drivers/hwmon/emc1403.c
> +++ b/drivers/hwmon/emc1403.c
> @@ -346,6 +346,9 @@ static int emc1403_detect(struct i2c_client *client,
>  	case 0x27:
>  		strscpy(info->type, "emc1424", I2C_NAME_SIZE);
>  		break;
> +	case 0x60:
> +		strscpy(info->type, "emc1442", I2C_NAME_SIZE);
> +		break;
>  	default:
>  		return -ENODEV;
>  	}
> @@ -430,7 +433,7 @@ static int emc1403_probe(struct i2c_client *client)
>  }
>  
>  static const unsigned short emc1403_address_list[] = {
> -	0x18, 0x1c, 0x29, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
> +	0x18, 0x1c, 0x29, 0x3c, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
>  };
>  
>  /* Last digit of chip name indicates number of channels */
> @@ -444,6 +447,7 @@ static const struct i2c_device_id emc1403_idtable[] = {
>  	{ "emc1422", emc1402 },
>  	{ "emc1423", emc1403 },
>  	{ "emc1424", emc1404 },
> +	{ "emc1442", emc1403 },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(i2c, emc1403_idtable);

Re: [PATCH v1] hwmon: emc1403: Add support for EMC1442

Posted by Patrick Williams 2 years, 1 month ago

On Tue, Oct 31, 2023 at 04:01:10PM -0700, Guenter Roeck wrote:
> On Tue, Oct 31, 2023 at 04:58:06PM +0800, Delphine CC Chiu wrote:
> > Add support for EMC1442 which is compatible with EMC1403.
> > 
> 
> Unfortunately, almost no information is available about this chip
> except that it ships in an 8-pin package. Are you sure the chip
> supports two external temperature sensors like EMC1403 ?
> The chip numbering and the number of pins would suggest that
> it only supports a single external temperature sensor,
> which would make it compatible to emc1402/emc1422.
> 
> Guenter

The datasheet I've seen says:

>> The EMC1442 monitors two temperature channels (one
>> external and one internal).

Based on this, I agree that emc1403 seems wrong.  The datasheet also
says:

>> Pin compatible with EMC1412

> 
> > Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
> > ---
> >  	{ "emc1422", emc1402 },
> >  	{ "emc1423", emc1403 },
> >  	{ "emc1424", emc1404 },
> > +	{ "emc1442", emc1403 },

So, emc1402?

> >  	{ }

-- 
Patrick Williams

Re: [PATCH v1] hwmon: emc1403: Add support for EMC1442

Posted by Guenter Roeck 2 years, 1 month ago

On 10/31/23 19:27, Patrick Williams wrote:
> On Tue, Oct 31, 2023 at 04:01:10PM -0700, Guenter Roeck wrote:
>> On Tue, Oct 31, 2023 at 04:58:06PM +0800, Delphine CC Chiu wrote:
>>> Add support for EMC1442 which is compatible with EMC1403.
>>>
>>
>> Unfortunately, almost no information is available about this chip
>> except that it ships in an 8-pin package. Are you sure the chip
>> supports two external temperature sensors like EMC1403 ?
>> The chip numbering and the number of pins would suggest that
>> it only supports a single external temperature sensor,
>> which would make it compatible to emc1402/emc1422.
>>
>> Guenter
> 
> The datasheet I've seen says:
> 
>>> The EMC1442 monitors two temperature channels (one
>>> external and one internal).
> 
> Based on this, I agree that emc1403 seems wrong.  The datasheet also
> says:
> 
>>> Pin compatible with EMC1412
> 
>>
>>> Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
>>> ---
>>>   	{ "emc1422", emc1402 },
>>>   	{ "emc1423", emc1403 },
>>>   	{ "emc1424", emc1404 },
>>> +	{ "emc1442", emc1403 },
> 
> So, emc1402?
> 

At the very least, if you are willing to confirm that formally
if/when v2 is submitted.

I previously rejected a similar patch adding emc1444 because it was
impossible to get a datasheet to confirm that the chips are really
register compatible. No idea why that has to be so secretive. It is a
temperature sensor, for heaven's sake :-(

Guenter

Re: [PATCH v1] hwmon: emc1403: Add support for EMC1442

Posted by Patrick Williams 2 years, 1 month ago

On Tue, Oct 31, 2023 at 09:57:28PM -0700, Guenter Roeck wrote:
> On 10/31/23 19:27, Patrick Williams wrote:
> > On Tue, Oct 31, 2023 at 04:01:10PM -0700, Guenter Roeck wrote:
> >> On Tue, Oct 31, 2023 at 04:58:06PM +0800, Delphine CC Chiu wrote:
> >>> Add support for EMC1442 which is compatible with EMC1403.
> >>>
> >>
> >> Unfortunately, almost no information is available about this chip
> >> except that it ships in an 8-pin package. Are you sure the chip
> >> supports two external temperature sensors like EMC1403 ?
> >> The chip numbering and the number of pins would suggest that
> >> it only supports a single external temperature sensor,
> >> which would make it compatible to emc1402/emc1422.
> >>
> >> Guenter
> > 
> > The datasheet I've seen says:
> > 
> >>> The EMC1442 monitors two temperature channels (one
> >>> external and one internal).
> > 
> > Based on this, I agree that emc1403 seems wrong.  The datasheet also
> > says:
> > 
> >>> Pin compatible with EMC1412
> > 
> >>
> >>> Signed-off-by: Delphine CC Chiu <Delphine_CC_Chiu@wiwynn.com>
> >>> ---
> >>>   	{ "emc1422", emc1402 },
> >>>   	{ "emc1423", emc1403 },
> >>>   	{ "emc1424", emc1404 },
> >>> +	{ "emc1442", emc1403 },
> > 
> > So, emc1402?
> > 
> 
> At the very least, if you are willing to confirm that formally
> if/when v2 is submitted.

Yes, I will confirm from the copy of the datasheet I have available
when v2 comes up.

> I previously rejected a similar patch adding emc1444 because it was
> impossible to get a datasheet to confirm that the chips are really
> register compatible. No idea why that has to be so secretive. It is a
> temperature sensor, for heaven's sake :-(

Delphine, could you reach out to the chip vendor and find out if they
are willing to publish a datasheet for this chip?  They might not have
updated their website yet because EMC1442 shows up on Microchip's site
but it has almost no information.

-- 
Patrick Williams