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SubjectRe: [RFC PATCH v2 6/7] typec: tcpm: Represent source supply through power_supply class
From
Date
Hi,

On 11/24/2017 01:19 PM, Heikki Krogerus wrote:
> Hi,
>
> On Tue, Nov 14, 2017 at 11:44:47AM +0000, Adam Thomson wrote:
>> diff --git a/drivers/usb/typec/tcpm.c b/drivers/usb/typec/tcpm.c
>> index 78983e1..7c26c3d 100644
>> --- a/drivers/usb/typec/tcpm.c
>> +++ b/drivers/usb/typec/tcpm.c
>> @@ -12,6 +12,7 @@
>> #include <linux/kernel.h>
>> #include <linux/module.h>
>> #include <linux/mutex.h>
>> +#include <linux/power_supply.h>
>> #include <linux/proc_fs.h>
>> #include <linux/sched/clock.h>
>> #include <linux/seq_file.h>
>> @@ -277,6 +278,10 @@ struct tcpm_port {
>> u32 current_limit;
>> u32 supply_voltage;
>>
>> + /* Used to export TA voltage and current */
>> + struct power_supply *psy;
>> + struct power_supply_desc psy_desc;
>> +
>> u32 bist_request;
>>
>> /* PD state for Vendor Defined Messages */
>> @@ -1756,6 +1761,7 @@ static int tcpm_pd_select_pdo(struct tcpm_port *port)
>> int ret = -EINVAL;
>>
>> port->pps_data.supported = false;
>> + port->psy_desc.type = POWER_SUPPLY_TYPE_USB_PD;
>>
>> /*
>> * Select the source PDO providing the most power while staying within
>> @@ -1775,8 +1781,10 @@ static int tcpm_pd_select_pdo(struct tcpm_port *port)
>> mv = pdo_min_voltage(pdo);
>> break;
>> case PDO_TYPE_APDO:
>> - if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
>> + if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
>> port->pps_data.supported = true;
>> + port->psy_desc.type = POWER_SUPPLY_TYPE_USB_PD_PPS;
>> + }
>> continue;
>> default:
>> tcpm_log(port, "Invalid PDO type, ignoring");
>> @@ -2248,6 +2256,9 @@ static void tcpm_reset_port(struct tcpm_port *port)
>> port->try_snk_count = 0;
>> port->supply_voltage = 0;
>> port->current_limit = 0;
>> + port->psy_desc.type = POWER_SUPPLY_TYPE_USB_TYPE_C;
>
> Is it OK to everybody that the type of the psy is changed like that?
> Hans?!
>
> We do have drivers that already change the type, for example
> drivers/power/supply/isp1704_charger.c, but what does the user space
> expect? The ABI for the power supply class was never documented I
> guess.

The main userspace consumer of the power_supply sysfs class is upower,
upower knows about 3 types: "Mains", "Battery" and "USB", anything
else it gives a type of UP_DEVICE_KIND_UNKNOWN. So POWER_SUPPLY_TYPE_USB_TYPE_C
vs POWER_SUPPLY_TYPE_USB_PD_PPS does matter to it.

Regards,

Hans

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