linux-kernel - Re: [PATCH 1/3] platform/chrome: cros_ec_proto: Add peripheral charger count API

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Date:   Mon, 18 Apr 2022 23:21:52 +0000
From:   Prashant Malani <pmalani@...omium.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Benson Leung <bleung@...omium.org>, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, Lee Jones <lee.jones@...aro.org>,
        Daisuke Nojiri <dnojiri@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        chrome-platform@...ts.linux.dev
Subject: Re: [PATCH 1/3] platform/chrome: cros_ec_proto: Add peripheral
 charger count API

On Apr 18 16:16, Stephen Boyd wrote:
> Quoting Prashant Malani (2022-04-18 16:08:39)
> > On Apr 14 17:32, Stephen Boyd wrote:
> > > diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> > > index c4caf2e2de82..42269703ca6c 100644
> > > --- a/drivers/platform/chrome/cros_ec_proto.c
> > > +++ b/drivers/platform/chrome/cros_ec_proto.c
> > > @@ -832,6 +832,37 @@ bool cros_ec_check_features(struct cros_ec_dev *ec, int feature)
> > >  }
> > >  EXPORT_SYMBOL_GPL(cros_ec_check_features);
> > >
> > > +/**
> > > + * cros_ec_pchg_port_count() - Return the number of peripheral charger ports.
> > > + * @ec: EC device.
> > > + *
> > > + * Return: Number of peripheral charger ports, or 0 in case of error.
> > > + */
> > > +unsigned int cros_ec_pchg_port_count(struct cros_ec_dev *ec)
> > > +{
> > > +     struct cros_ec_command *msg;
> > > +     const struct ec_response_pchg_count *rsp;
> > > +     struct cros_ec_device *ec_dev = ec->ec_dev;
> > > +     int ret, count = 0;
> > > +
> > > +     msg = kzalloc(sizeof(*msg) + sizeof(*rsp), GFP_KERNEL);
> > > +     if (!msg)
> > > +             return 0;
> > > +
> > > +     msg->command = EC_CMD_PCHG_COUNT + ec->cmd_offset;
> > > +     msg->insize = sizeof(*rsp);
> > > +
> > > +     ret = cros_ec_cmd_xfer_status(ec_dev, msg);
> > > +     if (ret >= 0) {
> > > +             rsp = (const struct ec_response_pchg_count *)msg->data;
> > > +             count = rsp->port_count;
> > > +     }
> > > +     kfree(msg);
> >
> > Can we use the wrapper function cros_ec_command() [1] here, which does
> > the kzalloc and msg construction?
> >
> 
> Sure. I take it that I can drop this function entirely then?

Yeah, if it's a simple response, should be fine.

> BTW, why is
> that function name the same as a struct name? It confuses my ctags.

Yeahhh, didn't think about ctags... :/
Topic for another series: probably can be renamed to cros_ec_cmd() (just to keep ctags happy) ?

Best regards,

-Prashant