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 16:16:12 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Prashant Malani <pmalani@...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

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