linux-kernel - Re: [PATCH v3 1/3] platform/chrome: typec: Use notifier for updates

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Date:   Tue, 14 Apr 2020 10:49:35 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH v3 1/3] platform/chrome: typec: Use notifier for updates

On Thu, Apr 09, 2020 at 05:23:15PM -0700, 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>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> 
> Changes in v3:
> - Fixed ordering issue in Kconfig dependency.
> 
> Changes in v2:
> - Added Kconfig dependency to CROS_USBPD_NOTIFY.
> - Fixed spacing error.
> - Removed superfluous devm_warn() call.
> 
>  drivers/platform/chrome/Kconfig         |  1 +
>  drivers/platform/chrome/cros_ec_typec.c | 23 +++++++++++++++++++++++
>  2 files changed, 24 insertions(+)
> 
> diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
> index 03ea5129ed0c3..a484ab2c91ff0 100644
> --- a/drivers/platform/chrome/Kconfig
> +++ b/drivers/platform/chrome/Kconfig
> @@ -217,6 +217,7 @@ config CROS_EC_SYSFS
>  config CROS_EC_TYPEC
>  	tristate "ChromeOS EC Type-C Connector Control"
>  	depends on MFD_CROS_EC_DEV && TYPEC
> +	depends on CROS_USBPD_NOTIFY
>  	default MFD_CROS_EC_DEV
>  	help
>  	  If you say Y here, you get support for accessing Type C connector
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index 874269c070739..d444dd7422a2a 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>
>  #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);
> +	}
> +
> +	return NOTIFY_OK;
> +}
> +
>  #ifdef CONFIG_ACPI
>  static const struct acpi_device_id cros_typec_acpi_id[] = {
>  	{ "GOOG0014", 0 },
> @@ -332,6 +350,11 @@ 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)
> +		goto unregister_ports;
> +
>  	return 0;
>  
>  unregister_ports:
> -- 
> 2.26.0.110.g2183baf09c-goog

thanks,

-- 
heikki