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Commit cf28369c authored by Ajay Gupta's avatar Ajay Gupta Committed by Greg Kroah-Hartman
Browse files

usb: typec: Add driver for NVIDIA Alt Modes 



Latest NVIDIA GPUs support VirtualLink device. Since USBIF
has not assigned a Standard ID (SID) for VirtualLink
so using NVIDA VID 0x955 as SVID.

Signed-off-by: default avatarAjay Gupta <ajayg@nvidia.com>
Signed-off-by: default avatarHeikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d266e968

drivers/usb/typec/altmodes/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -12,4 +12,14 @@ config TYPEC_DP_ALTMODE 
	  To compile this driver as a module, choose M here: the

	  module will be called typec_displayport.



config TYPEC_NVIDIA_ALTMODE

	tristate "NVIDIA Alternate Mode driver"

	depends on TYPEC_DP_ALTMODE

	help

	  Latest NVIDIA GPUs support VirtualLink devices. Select this

	  to enable support for VirtualLink devices with NVIDIA GPUs.



	  To compile this driver as a module, choose M here: the

	  module will be called typec_displayport.



endmenu

drivers/usb/typec/altmodes/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -2,3 +2,5 @@ 


obj-$(CONFIG_TYPEC_DP_ALTMODE)		+= typec_displayport.o

typec_displayport-y			:= displayport.o

obj-$(CONFIG_TYPEC_NVIDIA_ALTMODE)	+= typec_nvidia.o

typec_nvidia-y				:= nvidia.o

drivers/usb/typec/altmodes/nvidia.c

0 → 100644
+44 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Copyright (C) 2019 NVIDIA Corporation. All rights reserved.

 *

 * NVIDIA USB Type-C Alt Mode Driver

 */

#include <linux/module.h>

#include <linux/usb/typec_altmode.h>

#include <linux/usb/typec_dp.h>

#include "displayport.h"



static int nvidia_altmode_probe(struct typec_altmode *alt)

{

	if (alt->svid == USB_TYPEC_NVIDIA_VLINK_SID)

		return dp_altmode_probe(alt);

	else

		return -ENOTSUPP;

}



static void nvidia_altmode_remove(struct typec_altmode *alt)

{

	if (alt->svid == USB_TYPEC_NVIDIA_VLINK_SID)

		dp_altmode_remove(alt);

}



static const struct typec_device_id nvidia_typec_id[] = {

	{ USB_TYPEC_NVIDIA_VLINK_SID, TYPEC_ANY_MODE },

	{ },

};

MODULE_DEVICE_TABLE(typec, nvidia_typec_id);



static struct typec_altmode_driver nvidia_altmode_driver = {

	.id_table = nvidia_typec_id,

	.probe = nvidia_altmode_probe,

	.remove = nvidia_altmode_remove,

	.driver = {

		.name = "typec_nvidia",

		.owner = THIS_MODULE,

	},

};

module_typec_altmode_driver(nvidia_altmode_driver);



MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("NVIDIA USB Type-C Alt Mode Driver");

drivers/usb/typec/ucsi/ucsi.c

+3 −1
Original line number Diff line number Diff line
@@ -283,6 +283,7 @@ static int ucsi_register_altmode(struct ucsi_connector *con, 


		switch (desc->svid) {

		case USB_TYPEC_DP_SID:

		case USB_TYPEC_NVIDIA_VLINK_SID:

			alt = ucsi_register_displayport(con, override, i, desc);

			break;

		default:
@@ -404,7 +405,8 @@ static void ucsi_unregister_altmodes(struct ucsi_connector *con, u8 recipient) 


	while (adev[i]) {

		if (recipient == UCSI_RECIPIENT_SOP &&

		    adev[i]->svid == USB_TYPEC_DP_SID) {

		    (adev[i]->svid == USB_TYPEC_DP_SID ||

			adev[i]->svid == USB_TYPEC_NVIDIA_VLINK_SID)) {

			pdev = typec_altmode_get_partner(adev[i]);

			ucsi_displayport_remove_partner((void *)pdev);

		}

include/linux/usb/typec_dp.h

+5 −0
Original line number Diff line number Diff line
@@ -5,6 +5,11 @@ 
#include <linux/usb/typec_altmode.h>



#define USB_TYPEC_DP_SID	0xff01

/* USB IF has not assigned a Standard ID (SID) for VirtualLink,

 * so the manufacturers of VirtualLink adapters use their Vendor

 * IDs as the SVID.

 */

#define USB_TYPEC_NVIDIA_VLINK_SID	0x955	/* NVIDIA VirtualLink */

#define USB_TYPEC_DP_MODE	1



/*