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// SPDX-License-Identifier: GPL-2.0
/*
* UCSI Thunderbolt Alternate Mode Support
*
* Copyright 2026 Google LLC
*/
#include <linux/usb/typec_tbt.h>
#include <linux/usb/pd_vdo.h>
#include <linux/err.h>
#include <linux/dev_printk.h>
#include <linux/device/devres.h>
#include <linux/gfp_types.h>
#include <linux/types.h>
#include <linux/usb/typec_altmode.h>
#include <linux/workqueue.h>
#include "ucsi.h"
/**
* struct ucsi_tbt - Thunderbolt Alternate Mode private data structure
* @con: Pointer to UCSI connector structure
* @alt: Pointer to typec altmode structure
* @work: Work structure
* @cam: An offset into the list of alternate modes supported by the PPM
* @header: VDO header
*/
struct ucsi_tbt {
struct ucsi_connector *con;
struct typec_altmode *alt;
struct work_struct work;
int cam;
u32 header;
};
static void ucsi_thunderbolt_work(struct work_struct *work)
{
struct ucsi_tbt *tbt = container_of(work, struct ucsi_tbt, work);
if (typec_altmode_vdm(tbt->alt, tbt->header, NULL, 0))
dev_err(&tbt->alt->dev, "VDM 0x%x failed\n", tbt->header);
tbt->header = 0;
}
static int ucsi_thunderbolt_set_altmode(struct ucsi_tbt *tbt,
bool enter, u32 vdo)
{
int svdm_version;
int cmd;
int ret;
u64 command = UCSI_SET_NEW_CAM |
UCSI_CONNECTOR_NUMBER(tbt->con->num) |
UCSI_SET_NEW_CAM_SET_AM(tbt->cam) |
((u64)vdo << 32);
if (enter)
command |= (1 << 23);
ret = ucsi_send_command(tbt->con->ucsi, command, NULL, 0);
if (ret < 0)
return ret;
svdm_version = typec_altmode_get_svdm_version(tbt->alt);
if (svdm_version < 0)
return svdm_version;
if (enter)
cmd = CMD_ENTER_MODE;
else
cmd = CMD_EXIT_MODE;
tbt->header = VDO(USB_TYPEC_TBT_SID, 1, svdm_version, cmd);
tbt->header |= VDO_OPOS(TYPEC_TBT_MODE);
tbt->header |= VDO_CMDT(CMDT_RSP_ACK);
schedule_work(&tbt->work);
return 0;
}
static int ucsi_thunderbolt_enter(struct typec_altmode *alt, u32 *vdo)
{
struct ucsi_tbt *tbt = typec_altmode_get_drvdata(alt);
struct ucsi_connector *con = tbt->con;
u64 command;
u8 cur = 0;
int ret;
if (!ucsi_con_mutex_lock(con))
return -ENOTCONN;
command = UCSI_GET_CURRENT_CAM | UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command(con->ucsi, command, &cur, sizeof(cur));
if (ret < 0) {
if (con->ucsi->version > 0x0100)
goto err_unlock;
cur = 0xff;
}
if (cur != 0xff) {
if (cur >= UCSI_MAX_ALTMODES || con->port_altmode[cur] != alt)
ret = -EBUSY;
else
ret = 0;
goto err_unlock;
}
ret = ucsi_thunderbolt_set_altmode(tbt, true, *vdo);
ucsi_altmode_update_active(tbt->con);
err_unlock:
ucsi_con_mutex_unlock(con);
return ret;
}
static int ucsi_thunderbolt_exit(struct typec_altmode *alt)
{
struct ucsi_tbt *tbt = typec_altmode_get_drvdata(alt);
int ret;
if (!ucsi_con_mutex_lock(tbt->con))
return -ENOTCONN;
ret = ucsi_thunderbolt_set_altmode(tbt, false, 0);
ucsi_con_mutex_unlock(tbt->con);
return ret;
}
static int ucsi_thunderbolt_vdm(struct typec_altmode *alt,
u32 header, const u32 *data, int count)
{
struct ucsi_tbt *tbt = typec_altmode_get_drvdata(alt);
int cmd_type = PD_VDO_CMDT(header);
int cmd = PD_VDO_CMD(header);
int svdm_version;
if (!ucsi_con_mutex_lock(tbt->con))
return -ENOTCONN;
svdm_version = typec_altmode_get_svdm_version(alt);
if (svdm_version < 0) {
ucsi_con_mutex_unlock(tbt->con);
return svdm_version;
}
switch (cmd_type) {
case CMDT_INIT:
if (PD_VDO_SVDM_VER(header) < svdm_version) {
svdm_version = PD_VDO_SVDM_VER(header);
typec_partner_set_svdm_version(tbt->con->partner, svdm_version);
}
tbt->header = VDO(USB_TYPEC_TBT_SID, 1, svdm_version, cmd);
tbt->header |= VDO_OPOS(TYPEC_TBT_MODE);
tbt->header |= VDO_CMDT(CMDT_RSP_ACK);
schedule_work(&tbt->work);
break;
default:
break;
}
ucsi_con_mutex_unlock(tbt->con);
return 0;
}
static const struct typec_altmode_ops ucsi_thunderbolt_ops = {
.enter = ucsi_thunderbolt_enter,
.exit = ucsi_thunderbolt_exit,
.vdm = ucsi_thunderbolt_vdm,
};
struct typec_altmode *ucsi_register_thunderbolt(struct ucsi_connector *con,
bool override, int offset,
struct typec_altmode_desc *desc)
{
struct typec_altmode *alt;
struct ucsi_tbt *tbt;
alt = typec_port_register_altmode(con->port, desc);
if (IS_ERR(alt) || !override)
return alt;
tbt = devm_kzalloc(&alt->dev, sizeof(*tbt), GFP_KERNEL);
if (!tbt) {
typec_unregister_altmode(alt);
return ERR_PTR(-ENOMEM);
}
tbt->cam = offset;
tbt->con = con;
tbt->alt = alt;
INIT_WORK(&tbt->work, ucsi_thunderbolt_work);
typec_altmode_set_drvdata(alt, tbt);
typec_altmode_set_ops(alt, &ucsi_thunderbolt_ops);
return alt;
}
void ucsi_thunderbolt_remove_partner(struct typec_altmode *alt)
{
struct ucsi_tbt *tbt;
if (alt) {
tbt = typec_altmode_get_drvdata(alt);
if (tbt)
cancel_work_sync(&tbt->work);
}
}
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