linux-kernel - Re: [PATCH 08/10] platform/chrome: cros_ec

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Message-ID: <Y7xv5v9ZZkUgkDlv@google.com>
Date:   Mon, 9 Jan 2023 11:49:58 -0800
From:   Benson Leung <bleung@...gle.com>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
        heikki.krogerus@...ux.intel.com,
        Benson Leung <bleung@...omium.org>,
        Daisuke Nojiri <dnojiri@...omium.org>,
        "Dustin L. Howett" <dustin@...ett.net>,
        Evan Green <evgreen@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Lee Jones <lee.jones@...aro.org>, Lee Jones <lee@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Tinghan Shen <tinghan.shen@...iatek.com>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        Xiang wangx <wangxiang@...rlc.com>
Subject: Re: [PATCH 08/10] platform/chrome: cros_ec_typec: Add initial VDM
 support

On Wed, Dec 28, 2022 at 12:45:11AM +0000, Prashant Malani wrote:
> Add ops to support USB PD VDM (Vendor Defined Message) from the port
> driver. This enables the port driver to interface with alternate mode
> drivers and communicate with connected peripherals.
> 
> The initial support just contains an implementation of the Enter
> Mode command.
> 
> Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Signed-off-by: Prashant Malani <pmalani@...omium.org>

Reviewed-by: Benson Leung <bleung@...omium.org>

> ---
>  MAINTAINERS                              |  1 +
>  drivers/platform/chrome/Makefile         |  2 +-
>  drivers/platform/chrome/cros_ec_typec.c  |  3 ++
>  drivers/platform/chrome/cros_typec_vdm.c | 43 ++++++++++++++++++++++++
>  drivers/platform/chrome/cros_typec_vdm.h | 10 ++++++
>  5 files changed, 58 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/platform/chrome/cros_typec_vdm.c
>  create mode 100644 drivers/platform/chrome/cros_typec_vdm.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8219b646ab50..cfccbbbb083f 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -5000,6 +5000,7 @@ L:	chrome-platform@...ts.linux.dev
>  S:	Maintained
>  F:	drivers/platform/chrome/cros_ec_typec.*
>  F:	drivers/platform/chrome/cros_typec_switch.c
> +F:	drivers/platform/chrome/cros_typec_vdm.*
>  
>  CHROMEOS EC USB PD NOTIFY DRIVER
>  M:	Prashant Malani <pmalani@...omium.org>
> diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
> index fd29fa74ba33..dae0ed3c8656 100644
> --- a/drivers/platform/chrome/Makefile
> +++ b/drivers/platform/chrome/Makefile
> @@ -16,7 +16,7 @@ obj-$(CONFIG_CROS_TYPEC_SWITCH)		+= cros_typec_switch.o
>  obj-$(CONFIG_CROS_EC_RPMSG)		+= cros_ec_rpmsg.o
>  obj-$(CONFIG_CROS_EC_SPI)		+= cros_ec_spi.o
>  cros_ec_lpcs-objs			:= cros_ec_lpc.o cros_ec_lpc_mec.o
> -cros-ec-typec-objs			:= cros_ec_typec.o
> +cros-ec-typec-objs			:= cros_ec_typec.o cros_typec_vdm.o
>  obj-$(CONFIG_CROS_EC_TYPEC)		+= cros-ec-typec.o
>  obj-$(CONFIG_CROS_EC_LPC)		+= cros_ec_lpcs.o
>  obj-$(CONFIG_CROS_EC_PROTO)		+= cros_ec_proto.o cros_ec_trace.o
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index a4eff590ca56..1e28d56b094d 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -17,6 +17,7 @@
>  #include <linux/usb/typec_tbt.h>
>  
>  #include "cros_ec_typec.h"
> +#include "cros_typec_vdm.h"
>  
>  #define DRV_NAME "cros-ec-typec"
>  
> @@ -272,6 +273,7 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
>  		return PTR_ERR(amode);
>  	port->port_altmode[CROS_EC_ALTMODE_DP] = amode;
>  	typec_altmode_set_drvdata(amode, port);
> +	amode->ops = &port_amode_ops;
>  
>  	/*
>  	 * Register TBT compatibility alt mode. The EC will not enter the mode
> @@ -286,6 +288,7 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
>  		return PTR_ERR(amode);
>  	port->port_altmode[CROS_EC_ALTMODE_TBT] = amode;
>  	typec_altmode_set_drvdata(amode, port);
> +	amode->ops = &port_amode_ops;
>  
>  	port->state.alt = NULL;
>  	port->state.mode = TYPEC_STATE_USB;
> diff --git a/drivers/platform/chrome/cros_typec_vdm.c b/drivers/platform/chrome/cros_typec_vdm.c
> new file mode 100644
> index 000000000000..df0102ca3a18
> --- /dev/null
> +++ b/drivers/platform/chrome/cros_typec_vdm.c
> @@ -0,0 +1,43 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * USB Power Delivery Vendor Defined Message (VDM) support code.
> + *
> + * Copyright 2023 Google LLC
> + * Author: Prashant Malani <pmalani@...omium.org>
> + */
> +
> +#include <linux/module.h>
> +#include <linux/platform_data/cros_ec_commands.h>
> +#include <linux/usb/pd_vdo.h>
> +
> +#include "cros_ec_typec.h"
> +#include "cros_typec_vdm.h"
> +
> +static int cros_typec_port_amode_enter(struct typec_altmode *amode, u32 *vdo)
> +{
> +	struct cros_typec_port *port = typec_altmode_get_drvdata(amode);
> +	struct ec_params_typec_control req = {
> +		.port = port->port_num,
> +		.command = TYPEC_CONTROL_COMMAND_SEND_VDM_REQ,
> +	};
> +	struct typec_vdm_req vdm_req = {};
> +	u32 hdr;
> +
> +	hdr = VDO(amode->svid, 1, SVDM_VER_2_0, CMD_ENTER_MODE);
> +	hdr |= VDO_OPOS(amode->mode);
> +
> +	vdm_req.vdm_data[0] = hdr;
> +	vdm_req.vdm_data_objects = 1;
> +	vdm_req.partner_type = TYPEC_PARTNER_SOP;
> +	req.vdm_req_params = vdm_req;
> +
> +	dev_dbg(port->typec_data->dev, "Sending EnterMode VDM, hdr: %x, port: %d\n",
> +		hdr, port->port_num);
> +
> +	return cros_ec_cmd(port->typec_data->ec, 0, EC_CMD_TYPEC_CONTROL, &req,
> +			   sizeof(req), NULL, 0);
> +}
> +
> +struct typec_altmode_ops port_amode_ops = {
> +	.enter = cros_typec_port_amode_enter,
> +};
> diff --git a/drivers/platform/chrome/cros_typec_vdm.h b/drivers/platform/chrome/cros_typec_vdm.h
> new file mode 100644
> index 000000000000..7e282d168a98
> --- /dev/null
> +++ b/drivers/platform/chrome/cros_typec_vdm.h
> @@ -0,0 +1,10 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#ifndef __CROS_TYPEC_VDM__
> +#define __CROS_TYPEC_VDM__
> +
> +#include <linux/usb/typec_altmode.h>
> +
> +extern struct typec_altmode_ops port_amode_ops;
> +
> +#endif /*  __CROS_TYPEC_VDM__ */
> -- 
> 2.39.0.314.g84b9a713c41-goog
> 
> 

-- 
Benson Leung
Staff Software Engineer
Chrome OS Kernel
Google Inc.
bleung@...gle.com
Chromium OS Project
bleung@...omium.org

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