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[PATCH 01/18] staging: typec: tcpm: Add get_usb2_current_limit tcpc_dev callback

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  [PATCH 01/18] staging: typec: tcpm: Add get_usb2_current_limit tcpc_dev callback Hans de Goede <hdegoede@redhat.com> - 2017-08-06 14:40 +0200
    Re: [PATCH 01/18] staging: typec: tcpm: Add get_usb2_current_limit  tcpc_dev callback Guenter Roeck <linux@roeck-us.net> - 2017-08-06 16:20 +0200
      Re: [PATCH 01/18] staging: typec: tcpm: Add get_usb2_current_limit  tcpc_dev callback Hans de Goede <hdegoede@redhat.com> - 2017-08-06 16:30 +0200
        Re: [PATCH 01/18] staging: typec: tcpm: Add get_usb2_current_limit  tcpc_dev callback Guenter Roeck <linux@roeck-us.net> - 2017-08-06 17:00 +0200

#1704825 — [PATCH 01/18] staging: typec: tcpm: Add get_usb2_current_limit tcpc_dev callback

A Rp signalling the default current limit indicates that we're possibly
connected to an USB2 power-source. In some cases the type-c
port-controller may provide the capability to detect the current-limit
for USB2 power-sources (through e.g. BC1.2 detection).

This commit adds an optional get_usb2_current_limit tcpc_dev callback
which allows the port-controller to return the detected current-limit
if the CC pin is pulled up with Rp.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/staging/typec/tcpm.c | 5 ++++-
 drivers/staging/typec/tcpm.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
index 20eb4ebcf8c3..9f5adace4309 100644
--- a/drivers/staging/typec/tcpm.c
+++ b/drivers/staging/typec/tcpm.c
@@ -660,7 +660,10 @@ static u32 tcpm_get_current_limit(struct tcpm_port *port)
 		break;
 	case TYPEC_CC_RP_DEF:
 	default:
-		limit = 0;
+		if (port->tcpc->get_usb2_current_limit)
+			limit = port->tcpc->get_usb2_current_limit(port->tcpc);
+		else
+			limit = 0;
 		break;
 	}
 
diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
index 19c307d31a5a..01b7d89379a3 100644
--- a/drivers/staging/typec/tcpm.h
+++ b/drivers/staging/typec/tcpm.h
@@ -108,6 +108,7 @@ struct tcpc_dev {
 
 	int (*init)(struct tcpc_dev *dev);
 	int (*get_vbus)(struct tcpc_dev *dev);
+	int (*get_usb2_current_limit)(struct tcpc_dev *dev); /* Optional */
 	int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
 	int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
 		      enum typec_cc_status *cc2);
-- 
2.13.3

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#1704855 — Re: [PATCH 01/18] staging: typec: tcpm: Add get_usb2_current_limit tcpc_dev callback

On 08/06/2017 05:35 AM, Hans de Goede wrote:
> A Rp signalling the default current limit indicates that we're possibly
> connected to an USB2 power-source. In some cases the type-c
> port-controller may provide the capability to detect the current-limit
> for USB2 power-sources (through e.g. BC1.2 detection).
> 
> This commit adds an optional get_usb2_current_limit tcpc_dev callback
> which allows the port-controller to return the detected current-limit
> if the CC pin is pulled up with Rp.
> 
> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
>   drivers/staging/typec/tcpm.c | 5 ++++-
>   drivers/staging/typec/tcpm.h | 1 +
>   2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
> index 20eb4ebcf8c3..9f5adace4309 100644
> --- a/drivers/staging/typec/tcpm.c
> +++ b/drivers/staging/typec/tcpm.c
> @@ -660,7 +660,10 @@ static u32 tcpm_get_current_limit(struct tcpm_port *port)
>   		break;
>   	case TYPEC_CC_RP_DEF:
>   	default:
> -		limit = 0;
> +		if (port->tcpc->get_usb2_current_limit)

I think this callback should just be get_current_limit.

> +			limit = port->tcpc->get_usb2_current_limit(port->tcpc);
> +		else
> +			limit = 0;
>   		break;
>   	}
>   
> diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
> index 19c307d31a5a..01b7d89379a3 100644
> --- a/drivers/staging/typec/tcpm.h
> +++ b/drivers/staging/typec/tcpm.h
> @@ -108,6 +108,7 @@ struct tcpc_dev {
>   
>   	int (*init)(struct tcpc_dev *dev);
>   	int (*get_vbus)(struct tcpc_dev *dev);
> +	int (*get_usb2_current_limit)(struct tcpc_dev *dev); /* Optional */
>   	int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
>   	int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
>   		      enum typec_cc_status *cc2);
> 

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#1704859 — Re: [PATCH 01/18] staging: typec: tcpm: Add get_usb2_current_limit tcpc_dev callback

Hi,

On 06-08-17 16:18, Guenter Roeck wrote:
> On 08/06/2017 05:35 AM, Hans de Goede wrote:
>> A Rp signalling the default current limit indicates that we're possibly
>> connected to an USB2 power-source. In some cases the type-c
>> port-controller may provide the capability to detect the current-limit
>> for USB2 power-sources (through e.g. BC1.2 detection).
>>
>> This commit adds an optional get_usb2_current_limit tcpc_dev callback
>> which allows the port-controller to return the detected current-limit
>> if the CC pin is pulled up with Rp.
>>
>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>> ---
>>   drivers/staging/typec/tcpm.c | 5 ++++-
>>   drivers/staging/typec/tcpm.h | 1 +
>>   2 files changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
>> index 20eb4ebcf8c3..9f5adace4309 100644
>> --- a/drivers/staging/typec/tcpm.c
>> +++ b/drivers/staging/typec/tcpm.c
>> @@ -660,7 +660,10 @@ static u32 tcpm_get_current_limit(struct tcpm_port *port)
>>           break;
>>       case TYPEC_CC_RP_DEF:
>>       default:
>> -        limit = 0;
>> +        if (port->tcpc->get_usb2_current_limit)
> 
> I think this callback should just be get_current_limit.

This is only used in the Rp-def case, which usually indicates being connected
with an A->C cable to a USB-2 device and the intend is for the callback to
implement some USB-2 specific method to detect the supported current-limit,
hence the name. If you prefer to name it just get_current_limit I can
change it for v2, but IMHO the usb2 part of the name is important as this
will not get called when USB-PD negotiation is used, nor when Rp has the Rp15
or Rp30 values.

Regards,

Hans



> 
>> +            limit = port->tcpc->get_usb2_current_limit(port->tcpc);
>> +        else
>> +            limit = 0;
>>           break;
>>       }
>> diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
>> index 19c307d31a5a..01b7d89379a3 100644
>> --- a/drivers/staging/typec/tcpm.h
>> +++ b/drivers/staging/typec/tcpm.h
>> @@ -108,6 +108,7 @@ struct tcpc_dev {
>>       int (*init)(struct tcpc_dev *dev);
>>       int (*get_vbus)(struct tcpc_dev *dev);
>> +    int (*get_usb2_current_limit)(struct tcpc_dev *dev); /* Optional */
>>       int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
>>       int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
>>                 enum typec_cc_status *cc2);
>>
> 

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#1704866 — Re: [PATCH 01/18] staging: typec: tcpm: Add get_usb2_current_limit tcpc_dev callback

On 08/06/2017 07:29 AM, Hans de Goede wrote:
> Hi,
> 
> On 06-08-17 16:18, Guenter Roeck wrote:
>> On 08/06/2017 05:35 AM, Hans de Goede wrote:
>>> A Rp signalling the default current limit indicates that we're possibly
>>> connected to an USB2 power-source. In some cases the type-c
>>> port-controller may provide the capability to detect the current-limit
>>> for USB2 power-sources (through e.g. BC1.2 detection).
>>>
>>> This commit adds an optional get_usb2_current_limit tcpc_dev callback
>>> which allows the port-controller to return the detected current-limit
>>> if the CC pin is pulled up with Rp.
>>>
>>> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
>>> ---
>>>   drivers/staging/typec/tcpm.c | 5 ++++-
>>>   drivers/staging/typec/tcpm.h | 1 +
>>>   2 files changed, 5 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
>>> index 20eb4ebcf8c3..9f5adace4309 100644
>>> --- a/drivers/staging/typec/tcpm.c
>>> +++ b/drivers/staging/typec/tcpm.c
>>> @@ -660,7 +660,10 @@ static u32 tcpm_get_current_limit(struct tcpm_port *port)
>>>           break;
>>>       case TYPEC_CC_RP_DEF:
>>>       default:
>>> -        limit = 0;
>>> +        if (port->tcpc->get_usb2_current_limit)
>>
>> I think this callback should just be get_current_limit.
> 
> This is only used in the Rp-def case, which usually indicates being connected
> with an A->C cable to a USB-2 device and the intend is for the callback to
> implement some USB-2 specific method to detect the supported current-limit,
> hence the name. If you prefer to name it just get_current_limit I can
> change it for v2, but IMHO the usb2 part of the name is important as this
> will not get called when USB-PD negotiation is used, nor when Rp has the Rp15
> or Rp30 values.
> 

As you say, it gets called in the Rp-def case, which can be set anytime.
I'd rather have a generic name and explain in tcpm.h as part of the API
description when it is used/called.

Note that it is also called in SNK_DISCOVERY if cc=Rp-def to calculate
and set the initial current limit, even with pd.

Thanks,
Guenter

> Regards,
> 
> Hans
> 
> 
> 
>>
>>> +            limit = port->tcpc->get_usb2_current_limit(port->tcpc);
>>> +        else
>>> +            limit = 0;
>>>           break;
>>>       }
>>> diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
>>> index 19c307d31a5a..01b7d89379a3 100644
>>> --- a/drivers/staging/typec/tcpm.h
>>> +++ b/drivers/staging/typec/tcpm.h
>>> @@ -108,6 +108,7 @@ struct tcpc_dev {
>>>       int (*init)(struct tcpc_dev *dev);
>>>       int (*get_vbus)(struct tcpc_dev *dev);
>>> +    int (*get_usb2_current_limit)(struct tcpc_dev *dev); /* Optional */
>>>       int (*set_cc)(struct tcpc_dev *dev, enum typec_cc_status cc);
>>>       int (*get_cc)(struct tcpc_dev *dev, enum typec_cc_status *cc1,
>>>                 enum typec_cc_status *cc2);
>>>
>>
> 

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