linux-kernel - Re: [PATCH 1/3] platform/chrome: typec: Use notifier for updates

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Message-ID: <20200409223913.GA15090@google.com>
Date:   Thu, 9 Apr 2020 15:39:13 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     linux-kernel@...r.kernel.org, heikki.krogerus@...ux.intel.com,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH 1/3] platform/chrome: typec: Use notifier for updates

Hi Enric,

Thanks for the reviews, as always. Kindly see inline:

On Thu, Apr 09, 2020 at 11:01:42PM +0200, Enric Balletbo i Serra wrote:
> Hi Prashant,
> 
> Thank you for the patch.
> 
> On 7/4/20 3:09, Prashant Malani wrote:
> > Register a listener for the cros-usbpd-notifier, and update port state
> > when a notification comes in.
> > 
> > Signed-off-by: Prashant Malani <pmalani@...omium.org>
> > ---
> >  drivers/platform/chrome/cros_ec_typec.c | 25 +++++++++++++++++++++++++
> >  1 file changed, 25 insertions(+)
> > 
> > diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> > index 874269c070739..cf7c2652a1d6d 100644
> > --- a/drivers/platform/chrome/cros_ec_typec.c
> > +++ b/drivers/platform/chrome/cros_ec_typec.c
> > @@ -11,6 +11,7 @@
> >  #include <linux/of.h>
> >  #include <linux/platform_data/cros_ec_commands.h>
> >  #include <linux/platform_data/cros_ec_proto.h>
> > +#include <linux/platform_data/cros_usbpd_notify.h>
> 
> I think you need to add a kconfig dependency/selection in order to don't have
> build problems.

Thanks, will make the change.
> 
> >  #include <linux/platform_device.h>
> >  #include <linux/usb/typec.h>
> >  
> > @@ -26,6 +27,7 @@ struct cros_typec_data {
> >  	struct typec_port *ports[EC_USB_PD_MAX_PORTS];
> >  	/* Initial capabilities for each port. */
> >  	struct typec_capability *caps[EC_USB_PD_MAX_PORTS];
> > +	struct notifier_block nb;
> >  };
> >  
> >  static int cros_typec_parse_port_props(struct typec_capability *cap,
> > @@ -272,6 +274,22 @@ static int cros_typec_get_cmd_version(struct cros_typec_data *typec)
> >  	return 0;
> >  }
> >  
> > +static int cros_ec_typec_event(struct notifier_block *nb,
> > +			       unsigned long host_event, void *_notify)
> > +{
> > +	struct cros_typec_data *typec = container_of(nb, struct cros_typec_data,
> > +						     nb);
> > +	int ret, i;
> > +
> > +	for (i = 0; i < typec->num_ports; i++) {
> > +		ret = cros_typec_port_update(typec, i);
> > +		if (ret < 0)
> > +			dev_warn(typec->dev, "Update failed for port:%d\n", i);
> 
> nit: space between : and %d
> 
Done.
> > +	}
> > +
> > +	return NOTIFY_OK;
> > +}
> > +
> >  #ifdef CONFIG_ACPI
> >  static const struct acpi_device_id cros_typec_acpi_id[] = {
> >  	{ "GOOG0014", 0 },
> > @@ -332,6 +350,13 @@ static int cros_typec_probe(struct platform_device *pdev)
> >  			goto unregister_ports;
> >  	}
> >  
> > +	typec->nb.notifier_call = cros_ec_typec_event;
> > +	ret = cros_usbpd_register_notify(&typec->nb);
> > +	if (ret < 0) {
> > +		dev_err(dev, "Failed to register notifier\n");
> 
> Currently cros_usbpd_register_notfity calls blocking_notifier_chain_register
> that always return zero. Is fine to check the error but the print is unneded. If
> probe fails will report the error.
> 
Done.

> > +		goto unregister_ports;
> > +	}
> > +
> >  	return 0;
> >  
> >  unregister_ports:
> > 

Best regards,

-Prashant