// SPDX-License-Identifier: GPL-2.0
/*
* USB Type-C Connector System Software Interface driver
*
* Copyright (C) 2017, Intel Corporation
* Author: Heikki Krogerus <[email protected]>
*/
#include <linux/completion.h>
#include <linux/property.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/usb/typec_dp.h>
#include "ucsi.h"
#include "trace.h"
/*
* UCSI_TIMEOUT_MS - PPM communication timeout
*
* Ideally we could use MIN_TIME_TO_RESPOND_WITH_BUSY (which is defined in UCSI
* specification) here as reference, but unfortunately we can't. It is very
* difficult to estimate the time it takes for the system to process the command
* before it is actually passed to the PPM.
*/
#define UCSI_TIMEOUT_MS 5000
/*
* UCSI_SWAP_TIMEOUT_MS - Timeout for role swap requests
*
* 5 seconds is close to the time it takes for CapsCounter to reach 0, so even
* if the PPM does not generate Connector Change events before that with
* partners that do not support USB Power Delivery, this should still work.
*/
#define UCSI_SWAP_TIMEOUT_MS 5000
void ucsi_notify_common(struct ucsi *ucsi, u32 cci)
{
/* Ignore bogus data in CCI if busy indicator is set. */
if (cci & UCSI_CCI_BUSY)
return;
if (UCSI_CCI_CONNECTOR(cci))
ucsi_connector_change(ucsi, UCSI_CCI_CONNECTOR(cci));
if (cci & UCSI_CCI_ACK_COMPLETE &&
test_bit(ACK_PENDING, &ucsi->flags))
complete(&ucsi->complete);
if (cci & UCSI_CCI_COMMAND_COMPLETE &&
test_bit(COMMAND_PENDING, &ucsi->flags))
complete(&ucsi->complete);
}
EXPORT_SYMBOL_GPL(ucsi_notify_common);
int ucsi_sync_control_common(struct ucsi *ucsi, u64 command)
{
bool ack = UCSI_COMMAND(command) == UCSI_ACK_CC_CI;
int ret;
if (ack)
set_bit(ACK_PENDING, &ucsi->flags);
else
set_bit(COMMAND_PENDING, &ucsi->flags);
ret = ucsi->ops->async_control(ucsi, command);
if (ret)
goto out_clear_bit;
if (!wait_for_completion_timeout(&ucsi->complete, 5 * HZ))
ret = -ETIMEDOUT;
out_clear_bit:
if (ack)
clear_bit(ACK_PENDING, &ucsi->flags);
else
clear_bit(COMMAND_PENDING, &ucsi->flags);
return ret;
}
EXPORT_SYMBOL_GPL(ucsi_sync_control_common);
static int ucsi_acknowledge(struct ucsi *ucsi, bool conn_ack)
{
u64 ctrl;
ctrl = UCSI_ACK_CC_CI;
ctrl |= UCSI_ACK_COMMAND_COMPLETE;
if (conn_ack) {
clear_bit(EVENT_PENDING, &ucsi->flags);
ctrl |= UCSI_ACK_CONNECTOR_CHANGE;
}
return ucsi->ops->sync_control(ucsi, ctrl);
}
static int ucsi_run_command(struct ucsi *ucsi, u64 command, u32 *cci,
void *data, size_t size, bool conn_ack)
{
int ret, err;
*cci = 0;
if (size > UCSI_MAX_DATA_LENGTH(ucsi))
return -EINVAL;
ret = ucsi->ops->sync_control(ucsi, command);
if (ucsi->ops->read_cci(ucsi, cci))
return -EIO;
if (*cci & UCSI_CCI_BUSY)
return ucsi_run_command(ucsi, UCSI_CANCEL, cci, NULL, 0, false) ?: -EBUSY;
if (ret)
return ret;
if (!(*cci & UCSI_CCI_COMMAND_COMPLETE))
return -EIO;
if (*cci & UCSI_CCI_NOT_SUPPORTED)
err = -EOPNOTSUPP;
else if (*cci & UCSI_CCI_ERROR)
err = -EIO;
else
err = 0;
if (!err && data && UCSI_CCI_LENGTH(*cci))
err = ucsi->ops->read_message_in(ucsi, data, size);
/*
* Don't ACK connection change if there was an error.
*/
ret = ucsi_acknowledge(ucsi, err ? false : conn_ack);
if (ret)
return ret;
return err ?: UCSI_CCI_LENGTH(*cci);
}
static int ucsi_read_error(struct ucsi *ucsi, u8 connector_num)
{
u64 command;
u16 error;
u32 cci;
int ret;
command = UCSI_GET_ERROR_STATUS | UCSI_CONNECTOR_NUMBER(connector_num);
ret = ucsi_run_command(ucsi, command, &cci, &error, sizeof(error), false);
if (ret < 0)
return ret;
switch (error) {
case UCSI_ERROR_INCOMPATIBLE_PARTNER:
return -EOPNOTSUPP;
case UCSI_ERROR_CC_COMMUNICATION_ERR:
return -ECOMM;
case UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL:
return -EPROTO;
case UCSI_ERROR_DEAD_BATTERY:
dev_warn(ucsi->dev, "Dead battery condition!\n");
return -EPERM;
case UCSI_ERROR_INVALID_CON_NUM:
case UCSI_ERROR_UNREGONIZED_CMD:
case UCSI_ERROR_INVALID_CMD_ARGUMENT:
dev_err(ucsi->dev, "possible UCSI driver bug %u\n", error);
return -EINVAL;
case UCSI_ERROR_OVERCURRENT:
dev_warn(ucsi->dev, "Overcurrent condition\n");
break;
case UCSI_ERROR_PARTNER_REJECTED_SWAP:
dev_warn(ucsi->dev, "Partner rejected swap\n");
break;
case UCSI_ERROR_HARD_RESET:
dev_warn(ucsi->dev, "Hard reset occurred\n");
break;
case UCSI_ERROR_PPM_POLICY_CONFLICT:
dev_warn(ucsi->dev, "PPM Policy conflict\n");
break;
case UCSI_ERROR_SWAP_REJECTED:
dev_warn(ucsi->dev, "Swap rejected\n");
break;
case UCSI_ERROR_REVERSE_CURRENT_PROTECTION:
dev_warn(ucsi->dev, "Reverse Current Protection detected\n");
break;
case UCSI_ERROR_SET_SINK_PATH_REJECTED:
dev_warn(ucsi->dev, "Set Sink Path rejected\n");
break;
case UCSI_ERROR_UNDEFINED:
default:
dev_err(ucsi->dev, "unknown error %u\n", error);
break;
}
return -EIO;
}
static int ucsi_send_command_common(struct ucsi *ucsi, u64 cmd,
void *data, size_t size, bool conn_ack)
{
u8 connector_num;
u32 cci;
int ret;
if (ucsi->version > UCSI_VERSION_1_2) {
switch (UCSI_COMMAND(cmd)) {
case UCSI_GET_ALTERNATE_MODES:
connector_num = UCSI_GET_ALTMODE_GET_CONNECTOR_NUMBER(cmd);
break;
case UCSI_PPM_RESET:
case UCSI_CANCEL:
case UCSI_ACK_CC_CI:
case UCSI_SET_NOTIFICATION_ENABLE:
case UCSI_GET_CAPABILITY:
connector_num = 0;
break;
default:
connector_num = UCSI_DEFAULT_GET_CONNECTOR_NUMBER(cmd);
break;
}
} else {
connector_num = 0;
}
mutex_lock(&ucsi->ppm_lock);
ret = ucsi_run_command(ucsi, cmd, &cci, data, size, conn_ack);
if (cci & UCSI_CCI_ERROR)
ret = ucsi_read_error(ucsi, connector_num);
mutex_unlock(&ucsi->ppm_lock);
return ret;
}
int ucsi_send_command(struct ucsi *ucsi, u64 command,
void *data, size_t size)
{
return ucsi_send_command_common(ucsi, command, data, size, false);
}
EXPORT_SYMBOL_GPL(ucsi_send_command);
/* -------------------------------------------------------------------------- */
struct ucsi_work {
struct delayed_work work;
struct list_head node;
unsigned long delay;
unsigned int count;
struct ucsi_connector *con;
int (*cb)(struct ucsi_connector *);
};
static void ucsi_poll_worker(struct work_struct *work)
{
struct ucsi_work *uwork = container_of(work, struct ucsi_work, work.work);
struct ucsi_connector *con = uwork->con;
int ret;
mutex_lock(&con->lock);
if (!con->partner) {
list_del(&uwork->node);
mutex_unlock(&con->lock);
kfree(uwork);
return;
}
ret = uwork->cb(con);
if (uwork->count-- && (ret == -EBUSY || ret == -ETIMEDOUT)) {
queue_delayed_work(con->wq, &uwork->work, uwork->delay);
} else {
list_del(&uwork->node);
kfree(uwork);
}
mutex_unlock(&con->lock);
}
static int ucsi_partner_task(struct ucsi_connector *con,
int (*cb)(struct ucsi_connector *),
int retries, unsigned long delay)
{
struct ucsi_work *uwork;
if (!con->partner)
return 0;
uwork = kzalloc(sizeof(*uwork), GFP_KERNEL);
if (!uwork)
return -ENOMEM;
INIT_DELAYED_WORK(&uwork->work, ucsi_poll_worker);
uwork->count = retries;
uwork->delay = delay;
uwork->con = con;
uwork->cb = cb;
list_add_tail(&uwork->node, &con->partner_tasks);
queue_delayed_work(con->wq, &uwork->work, delay);
return 0;
}
/* -------------------------------------------------------------------------- */
void ucsi_altmode_update_active(struct ucsi_connector *con)
{
const struct typec_altmode *altmode = NULL;
u64 command;
int ret;
u8 cur;
int i;
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) {
dev_err(con->ucsi->dev,
"GET_CURRENT_CAM command failed\n");
return;
}
cur = 0xff;
}
if (cur < UCSI_MAX_ALTMODES)
altmode = typec_altmode_get_partner(con->port_altmode[cur]);
for (i = 0; con->partner_altmode[i]; i++)
typec_altmode_update_active(con->partner_altmode[i],
con->partner_altmode[i] == altmode);
}
static int ucsi_altmode_next_mode(struct typec_altmode **alt, u16 svid)
{
u8 mode = 1;
int i;
for (i = 0; alt[i]; i++) {
if (i > MODE_DISCOVERY_MAX)
return -ERANGE;
if (alt[i]->svid == svid)
mode++;
}
return mode;
}
static int ucsi_next_altmode(struct typec_altmode **alt)
{
int i = 0;
for (i = 0; i < UCSI_MAX_ALTMODES; i++)
if (!alt[i])
return i;
return -ENOENT;
}
static int ucsi_get_num_altmode(struct typec_altmode **alt)
{
int i;
for (i = 0; i < UCSI_MAX_ALTMODES; i++)
if (!alt[i])
break;
return i;
}
static int ucsi_register_altmode(struct ucsi_connector *con,
struct typec_altmode_desc *desc,
u8 recipient)
{
struct typec_altmode *alt;
bool override;
int ret;
int i;
override = !!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_OVERRIDE);
switch (recipient) {
case UCSI_RECIPIENT_CON:
i = ucsi_next_altmode(con->port_altmode);
if (i < 0) {
ret = i;
goto err;
}
ret = ucsi_altmode_next_mode(con->port_altmode, desc->svid);
if (ret < 0)
return ret;
desc->mode = ret;
switch (desc->svid) {
case USB_TYPEC_DP_SID:
alt = ucsi_register_displayport(con, override, i, desc);
break;
case USB_TYPEC_NVIDIA_VLINK_SID:
if (desc->vdo == USB_TYPEC_NVIDIA_VLINK_DBG_VDO)
alt = typec_port_register_altmode(con->port,
desc);
else
alt = ucsi_register_displayport(con, override,
i, desc);
break;
default:
alt = typec_port_register_altmode(con->port, desc);
break;
}
if (IS_ERR(alt)) {
ret = PTR_ERR(alt);
goto err;
}
con->port_altmode[i] = alt;
break;
case UCSI_RECIPIENT_SOP:
i = ucsi_next_altmode(con->partner_altmode);
if (i < 0) {
ret = i;
goto err;
}
ret = ucsi_altmode_next_mode(con->partner_altmode, desc->svid);
if (ret < 0)
return ret;
desc->mode = ret;
alt = typec_partner_register_altmode(con->partner, desc);
if (IS_ERR(alt)) {
ret = PTR_ERR(alt);
goto err;
}
con->partner_altmode[i] = alt;
break;
case UCSI_RECIPIENT_SOP_P:
i = ucsi_next_altmode(con->plug_altmode);
if (i < 0) {
ret = i;
goto err;
}
ret = ucsi_altmode_next_mode(con->plug_altmode, desc->svid);
if (ret < 0)
return ret;
desc->mode = ret;
alt = typec_plug_register_altmode(con->plug, desc);
if (IS_ERR(alt)) {
ret = PTR_ERR(alt);
goto err;
}
con->plug_altmode[i] = alt;
break;
default:
return -EINVAL;
}
trace_ucsi_register_altmode(recipient, alt);
return 0;
err:
dev_err(con->ucsi->dev, "failed to registers svid 0x%04x mode %d\n",
desc->svid, desc->mode);
return ret;
}
static int
ucsi_register_altmodes_nvidia(struct ucsi_connector *con, u8 recipient)
{
int max_altmodes = UCSI_MAX_ALTMODES;
struct typec_altmode_desc desc;
struct ucsi_altmode alt;
struct ucsi_altmode orig[UCSI_MAX_ALTMODES];
struct ucsi_altmode updated[UCSI_MAX_ALTMODES];
struct ucsi *ucsi = con->ucsi;
bool multi_dp = false;
u64 command;
int ret;
int len;
int i;
int k = 0;
if (recipient == UCSI_RECIPIENT_CON)
max_altmodes = con->ucsi->cap.num_alt_modes;
memset(orig, 0, sizeof(orig));
memset(updated, 0, sizeof(updated));
/* First get all the alternate modes */
for (i = 0; i < max_altmodes; i++) {
memset(&alt, 0, sizeof(alt));
command = UCSI_GET_ALTERNATE_MODES;
command |= UCSI_GET_ALTMODE_RECIPIENT(recipient);
command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num);
command |= UCSI_GET_ALTMODE_OFFSET(i);
len = ucsi_send_command(con->ucsi, command, &alt, sizeof(alt));
/*
* We are collecting all altmodes first and then registering.
* Some type-C device will return zero length data beyond last
* alternate modes. We should not return if length is zero.
*/
if (len < 0)
return len;
/* We got all altmodes, now break out and register them */
if (!len || !alt.svid)
break;
orig[k].mid = alt.mid;
orig[k].svid = alt.svid;
k++;
}
/*
* Update the original altmode table as some ppms may report
* multiple DP altmodes.
*/
if (recipient == UCSI_RECIPIENT_CON)
multi_dp = ucsi->ops->update_altmodes(ucsi, orig, updated);
/* now register altmodes */
for (i = 0; i < max_altmodes; i++) {
memset(&desc, 0, sizeof(desc));
if (multi_dp && recipient == UCSI_RECIPIENT_CON) {
desc.svid = updated[i].svid;
desc.vdo = updated[i].mid;
} else {
desc.svid = orig[i].svid;
desc.vdo = orig[i].mid;
}
desc.roles = TYPEC_PORT_DRD;
if (!desc.svid)
return 0;
ret = ucsi_register_altmode(con, &desc, recipient);
if (ret)
return ret;
}
return 0;
}
static int ucsi_register_altmodes(struct ucsi_connector *con, u8 recipient)
{
int max_altmodes = UCSI_MAX_ALTMODES;
struct typec_altmode_desc desc;
struct ucsi_altmode alt[2];
u64 command;
int num;
int ret;
int len;
int j;
int i;
if (!(con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS))
return 0;
if (recipient == UCSI_RECIPIENT_SOP && con->partner_altmode[0])
return 0;
if (con->ucsi->ops->update_altmodes)
return ucsi_register_altmodes_nvidia(con, recipient);
if (recipient == UCSI_RECIPIENT_CON)
max_altmodes = con->ucsi->cap.num_alt_modes;
for (i = 0; i < max_altmodes;) {
memset(alt, 0, sizeof(alt));
command = UCSI_GET_ALTERNATE_MODES;
command |= UCSI_GET_ALTMODE_RECIPIENT(recipient);
command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num);
command |= UCSI_GET_ALTMODE_OFFSET(i);
len = ucsi_send_command(con->ucsi, command, alt, sizeof(alt));
if (len == -EBUSY)
continue;
if (len <= 0)
return len;
/*
* This code is requesting one alt mode at a time, but some PPMs
* may still return two. If that happens both alt modes need be
* registered and the offset for the next alt mode has to be
* incremented.
*/
num = len / sizeof(alt[0]);
i += num;
for (j = 0; j < num; j++) {
if (!alt[j].svid)
return 0;
memset(&desc, 0, sizeof(desc));
desc.vdo = alt[j].mid;
desc.svid = alt[j].svid;
desc.roles = TYPEC_PORT_DRD;
ret = ucsi_register_altmode(con, &desc, recipient);
if (ret)
return ret;
}
}
return 0;
}
static void ucsi_unregister_altmodes(struct ucsi_connector *con, u8 recipient)
{
const struct typec_altmode *pdev;
struct typec_altmode **adev;
int i = 0;
switch (recipient) {
case UCSI_RECIPIENT_CON:
adev = con->port_altmode;
break;
case UCSI_RECIPIENT_SOP:
adev = con->partner_altmode;
break;
case UCSI_RECIPIENT_SOP_P:
adev = con->plug_altmode;
break;
default:
return;
}
while (adev[i]) {
if (recipient == UCSI_RECIPIENT_SOP &&
(adev[i]->svid == USB_TYPEC_DP_SID ||
(adev[i]->svid == USB_TYPEC_NVIDIA_VLINK_SID &&
adev[i]->vdo != USB_TYPEC_NVIDIA_VLINK_DBG_VDO))) {
pdev = typec_altmode_get_partner(adev[i]);
ucsi_displayport_remove_partner((void *)pdev);
}
typec_unregister_altmode(adev[i]);
adev[i++] = NULL;
}
}
static int ucsi_read_pdos(struct ucsi_connector *con,
enum typec_role role, int is_partner,
u32 *pdos, int offset, int num_pdos)
{
struct ucsi *ucsi = con->ucsi;
u64 command;
int ret;
if (is_partner &&
ucsi->quirks & UCSI_NO_PARTNER_PDOS &&
((con->status.flags & UCSI_CONSTAT_PWR_DIR) ||
!is_source(role)))
return 0;
command = UCSI_COMMAND(UCSI_GET_PDOS) | UCSI_CONNECTOR_NUMBER(con->num);
command |= UCSI_GET_PDOS_PARTNER_PDO(is_partner);
command |= UCSI_GET_PDOS_PDO_OFFSET(offset);
command |= UCSI_GET_PDOS_NUM_PDOS(num_pdos - 1);
command |= is_source(role) ? UCSI_GET_PDOS_SRC_PDOS : 0;
ret = ucsi_send_command(ucsi, command, pdos + offset,
num_pdos * sizeof(u32));
if (ret < 0 && ret != -ETIMEDOUT)
dev_err(ucsi->dev, "UCSI_GET_PDOS failed (%d)\n", ret);
return ret;
}
static int ucsi_get_pdos(struct ucsi_connector *con, enum typec_role role,
int is_partner, u32 *pdos)
{
struct ucsi *ucsi = con->ucsi;
u8 num_pdos;
int ret;
if (!(ucsi->cap.features & UCSI_CAP_PDO_DETAILS))
return 0;
/* UCSI max payload means only getting at most 4 PDOs at a time */
ret = ucsi_read_pdos(con, role, is_partner, pdos, 0, UCSI_MAX_PDOS);
if (ret < 0)
return ret;
num_pdos = ret / sizeof(u32); /* number of bytes to 32-bit PDOs */
if (num_pdos < UCSI_MAX_PDOS)
return num_pdos;
/* get the remaining PDOs, if any */
ret = ucsi_read_pdos(con, role, is_partner, pdos, UCSI_MAX_PDOS,
PDO_MAX_OBJECTS - UCSI_MAX_PDOS);
if (ret < 0)
return ret;
return ret / sizeof(u32) + num_pdos;
}
static int ucsi_get_src_pdos(struct ucsi_connector *con)
{
int ret;
ret = ucsi_get_pdos(con, TYPEC_SOURCE, 1, con->src_pdos);
if (ret < 0)
return ret;
con->num_pdos = ret;
ucsi_port_psy_changed(con);
return ret;
}
static struct usb_power_delivery_capabilities *ucsi_get_pd_caps(struct ucsi_connector *con,
enum typec_role role,
bool is_partner)
{
struct usb_power_delivery_capabilities_desc pd_caps;
int ret;
ret = ucsi_get_pdos(con, role, is_partner, pd_caps.pdo);
if (ret <= 0)
return ERR_PTR(ret);
if (ret < PDO_MAX_OBJECTS)
pd_caps.pdo[ret] = 0;
pd_caps.role = role;
return usb_power_delivery_register_capabilities(is_partner ? con->partner_pd : con->pd,
&pd_caps);
}
static int ucsi_get_pd_message(struct ucsi_connector *con, u8 recipient,
size_t bytes, void *data, u8 type)
{
size_t len = min(bytes, UCSI_MAX_DATA_LENGTH(con->ucsi));
u64 command;
u8 offset;
int ret;
for (offset = 0; offset < bytes; offset += len) {
len = min(len, bytes - offset);
command = UCSI_COMMAND(UCSI_GET_PD_MESSAGE) | UCSI_CONNECTOR_NUMBER(con->num);
command |= UCSI_GET_PD_MESSAGE_RECIPIENT(recipient);
command |= UCSI_GET_PD_MESSAGE_OFFSET(offset);
command |= UCSI_GET_PD_MESSAGE_BYTES(len);
command |= UCSI_GET_PD_MESSAGE_TYPE(type);
ret = ucsi_send_command(con->ucsi, command, data + offset, len);
if (ret < 0)
return ret;
}
return 0;
}
static int ucsi_get_partner_identity(struct ucsi_connector *con)
{
u32 vdo[7] = {};
int ret;
ret = ucsi_get_pd_message(con, UCSI_RECIPIENT_SOP, sizeof(vdo), vdo,
UCSI_GET_PD_MESSAGE_TYPE_IDENTITY);
if (ret < 0)
return ret;
/* VDM Header is not part of struct usb_pd_identity, so dropping it. */
con->partner_identity = *(struct usb_pd_identity *)&vdo[1];
ret = typec_partner_set_identity(con->partner);
if (ret < 0)
dev_err(con->ucsi->dev, "Failed to set partner identity (%d)\n", ret);
return ret;
}
static int ucsi_get_cable_identity(struct ucsi_connector *con)
{
u32 vdo[7] = {};
int ret;
ret = ucsi_get_pd_message(con, UCSI_RECIPIENT_SOP_P, sizeof(vdo), vdo,
UCSI_GET_PD_MESSAGE_TYPE_IDENTITY);
if (ret < 0)
return ret;
con->cable_identity = *(struct usb_pd_identity *)&vdo[1];
ret = typec_cable_set_identity(con->cable);
if (ret < 0)
dev_err(con->ucsi->dev, "Failed to set cable identity (%d)\n", ret);
return ret;
}
static int ucsi_check_altmodes(struct ucsi_connector *con)
{
int ret, num_partner_am;
ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP);
if (ret && ret != -ETIMEDOUT)
dev_err(con->ucsi->dev,
"con%d: failed to register partner alt modes (%d)\n",
con->num, ret);
/* Ignoring the errors in this case. */
if (con->partner_altmode[0]) {
num_partner_am = ucsi_get_num_altmode(con->partner_altmode);
typec_partner_set_num_altmodes(con->partner, num_partner_am);
ucsi_altmode_update_active(con);
return 0;
} else {
typec_partner_set_num_altmodes(con->partner, 0);
}
return ret;
}
static void ucsi_register_device_pdos(struct ucsi_connector *con)
{
struct ucsi *ucsi = con->ucsi;
struct usb_power_delivery_desc desc = { ucsi->cap.pd_version };
struct usb_power_delivery_capabilities *pd_cap;
if (con->pd)
return;
con->pd = usb_power_delivery_register(ucsi->dev, &desc);
pd_cap = ucsi_get_pd_caps(con, TYPEC_SOURCE, false);
if (!IS_ERR(pd_cap))
con->port_source_caps = pd_cap;
pd_cap = ucsi_get_pd_caps(con, TYPEC_SINK, false);
if (!IS_ERR(pd_cap))
con->port_sink_caps = pd_cap;
typec_port_set_usb_power_delivery(con->port, con->pd);
}
static int ucsi_register_partner_pdos(struct ucsi_connector *con)
{
struct usb_power_delivery_desc desc = { con->ucsi->cap.pd_version };
struct usb_power_delivery_capabilities *cap;
if (con->partner_pd)
return 0;
con->partner_pd = typec_partner_usb_power_delivery_register(con->partner, &desc);
if (IS_ERR(con->partner_pd))
return PTR_ERR(con->partner_pd);
cap = ucsi_get_pd_caps(con, TYPEC_SOURCE, true);
if (IS_ERR(cap))
return PTR_ERR(cap);
con->partner_source_caps = cap;
cap = ucsi_get_pd_caps(con, TYPEC_SINK, true);
if (IS_ERR(cap))
return PTR_ERR(cap);
con->partner_sink_caps = cap;
return typec_partner_set_usb_power_delivery(con->partner, con->partner_pd);
}
static void ucsi_unregister_partner_pdos(struct ucsi_connector *con)
{
usb_power_delivery_unregister_capabilities(con->partner_sink_caps);
con->partner_sink_caps = NULL;
usb_power_delivery_unregister_capabilities(con->partner_source_caps);
con->partner_source_caps = NULL;
usb_power_delivery_unregister(con->partner_pd);
con->partner_pd = NULL;
}
static int ucsi_register_plug(struct ucsi_connector *con)
{
struct typec_plug *plug;
struct typec_plug_desc desc = {.index = TYPEC_PLUG_SOP_P};
plug = typec_register_plug(con->cable, &desc);
if (IS_ERR(plug)) {
dev_err(con->ucsi->dev,
"con%d: failed to register plug (%ld)\n", con->num,
PTR_ERR(plug));
return PTR_ERR(plug);
}
con->plug = plug;
return 0;
}
static void ucsi_unregister_plug(struct ucsi_connector *con)
{
if (!con->plug)
return;
ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP_P);
typec_unregister_plug(con->plug);
con->plug = NULL;
}
static int ucsi_register_cable(struct ucsi_connector *con)
{
struct ucsi_cable_property cable_prop;
struct typec_cable *cable;
struct typec_cable_desc desc = {};
u64 command;
int ret;
command = UCSI_GET_CABLE_PROPERTY | UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command(con->ucsi, command, &cable_prop, sizeof(cable_prop));
if (ret < 0) {
dev_err(con->ucsi->dev, "GET_CABLE_PROPERTY failed (%d)\n", ret);
return ret;
}
switch (UCSI_CABLE_PROP_FLAG_PLUG_TYPE(cable_prop.flags)) {
case UCSI_CABLE_PROPERTY_PLUG_TYPE_A:
desc.type = USB_PLUG_TYPE_A;
break;
case UCSI_CABLE_PROPERTY_PLUG_TYPE_B:
desc.type = USB_PLUG_TYPE_B;
break;
case UCSI_CABLE_PROPERTY_PLUG_TYPE_C:
desc.type = USB_PLUG_TYPE_C;
break;
default:
desc.type = USB_PLUG_NONE;
break;
}
if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
desc.identity = &con->cable_identity;
desc.active = !!(UCSI_CABLE_PROP_FLAG_ACTIVE_CABLE & cable_prop.flags);
if (con->ucsi->version >= UCSI_VERSION_2_1)
desc.pd_revision = UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV_AS_BCD(cable_prop.flags);
cable = typec_register_cable(con->port, &desc);
if (IS_ERR(cable)) {
dev_err(con->ucsi->dev,
"con%d: failed to register cable (%ld)\n", con->num,
PTR_ERR(cable));
return PTR_ERR(cable);
}
con->cable = cable;
return 0;
}
static void ucsi_unregister_cable(struct ucsi_connector *con)
{
if (!con->cable)
return;
ucsi_unregister_plug(con);
typec_unregister_cable(con->cable);
memset(&con->cable_identity, 0, sizeof(con->cable_identity));
con->cable = NULL;
}
static int ucsi_check_connector_capability(struct ucsi_connector *con)
{
u64 command;
int ret;
if (!con->partner || con->ucsi->version < UCSI_VERSION_2_1)
return 0;
command = UCSI_GET_CONNECTOR_CAPABILITY | UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command(con->ucsi, command, &con->cap, sizeof(con->cap));
if (ret < 0) {
dev_err(con->ucsi->dev, "GET_CONNECTOR_CAPABILITY failed (%d)\n", ret);
return ret;
}
typec_partner_set_pd_revision(con->partner,
UCSI_CONCAP_FLAG_PARTNER_PD_MAJOR_REV_AS_BCD(con->cap.flags));
return ret;
}
static void ucsi_pwr_opmode_change(struct ucsi_connector *con)
{
switch (UCSI_CONSTAT_PWR_OPMODE(con->status.flags)) {
case UCSI_CONSTAT_PWR_OPMODE_PD:
con->rdo = con->status.request_data_obj;
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_PD);
ucsi_partner_task(con, ucsi_get_src_pdos, 30, 0);
ucsi_partner_task(con, ucsi_check_altmodes, 30, HZ);
ucsi_partner_task(con, ucsi_register_partner_pdos, 1, HZ);
ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
break;
case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5:
con->rdo = 0;
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_1_5A);
break;
case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0:
con->rdo = 0;
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_3_0A);
break;
default:
con->rdo = 0;
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_USB);
break;
}
}
static int ucsi_register_partner(struct ucsi_connector *con)
{
u8 pwr_opmode = UCSI_CONSTAT_PWR_OPMODE(con->status.flags);
struct typec_partner_desc desc;
struct typec_partner *partner;
if (con->partner)
return 0;
memset(&desc, 0, sizeof(desc));
switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
case UCSI_CONSTAT_PARTNER_TYPE_DEBUG:
desc.accessory = TYPEC_ACCESSORY_DEBUG;
break;
case UCSI_CONSTAT_PARTNER_TYPE_AUDIO:
desc.accessory = TYPEC_ACCESSORY_AUDIO;
break;
default:
break;
}
if (pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD)
ucsi_register_device_pdos(con);
if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
desc.identity = &con->partner_identity;
desc.usb_pd = pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD;
partner = typec_register_partner(con->port, &desc);
if (IS_ERR(partner)) {
dev_err(con->ucsi->dev,
"con%d: failed to register partner (%ld)\n", con->num,
PTR_ERR(partner));
return PTR_ERR(partner);
}
con->partner = partner;
return 0;
}
static void ucsi_unregister_partner(struct ucsi_connector *con)
{
if (!con->partner)
return;
typec_set_mode(con->port, TYPEC_STATE_SAFE);
typec_partner_set_usb_power_delivery(con->partner, NULL);
ucsi_unregister_partner_pdos(con);
ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP);
ucsi_unregister_cable(con);
typec_unregister_partner(con->partner);
memset(&con->partner_identity, 0, sizeof(con->partner_identity));
con->partner = NULL;
}
static void ucsi_partner_change(struct ucsi_connector *con)
{
enum usb_role u_role = USB_ROLE_NONE;
int ret;
switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
case UCSI_CONSTAT_PARTNER_TYPE_UFP:
case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
u_role = USB_ROLE_HOST;
fallthrough;
case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
typec_set_data_role(con->port, TYPEC_HOST);
break;
case UCSI_CONSTAT_PARTNER_TYPE_DFP:
u_role = USB_ROLE_DEVICE;
typec_set_data_role(con->port, TYPEC_DEVICE);
break;
default:
break;
}
if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
case UCSI_CONSTAT_PARTNER_TYPE_DEBUG:
typec_set_mode(con->port, TYPEC_MODE_DEBUG);
break;
case UCSI_CONSTAT_PARTNER_TYPE_AUDIO:
typec_set_mode(con->port, TYPEC_MODE_AUDIO);
break;
default:
if (UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) ==
UCSI_CONSTAT_PARTNER_FLAG_USB)
typec_set_mode(con->port, TYPEC_STATE_USB);
}
}
/* Only notify USB controller if partner supports USB data */
if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB))
u_role = USB_ROLE_NONE;
ret = usb_role_switch_set_role(con->usb_role_sw, u_role);
if (ret)
dev_err(con->ucsi->dev, "con:%d: failed to set usb role:%d\n",
con->num, u_role);
}
static int ucsi_check_connection(struct ucsi_connector *con)
{
u8 prev_flags = con->status.flags;
u64 command;
int ret;
command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command(con->ucsi, command, &con->status, sizeof(con->status));
if (ret < 0) {
dev_err(con->ucsi->dev, "GET_CONNECTOR_STATUS failed (%d)\n", ret);
return ret;
}
if (con->status.flags == prev_flags)
return 0;
if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
ucsi_register_partner(con);
ucsi_pwr_opmode_change(con);
ucsi_partner_change(con);
} else {
ucsi_partner_change(con);
ucsi_port_psy_changed(con);
ucsi_unregister_partner(con);
}
return 0;
}
static int ucsi_check_cable(struct ucsi_connector *con)
{
int ret, num_plug_am;
if (con->cable)
return 0;
ret = ucsi_register_cable(con);
if (ret < 0)
return ret;
if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE) {
ret = ucsi_get_cable_identity(con);
if (ret < 0)
return ret;
}
if (con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS) {
ret = ucsi_register_plug(con);
if (ret < 0)
return ret;
ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
if (ret < 0)
return ret;
if (con->plug_altmode[0]) {
num_plug_am = ucsi_get_num_altmode(con->plug_altmode);
typec_plug_set_num_altmodes(con->plug, num_plug_am);
} else {
typec_plug_set_num_altmodes(con->plug, 0);
}
}
return 0;
}
static void ucsi_handle_connector_change(struct work_struct *work)
{
struct ucsi_connector *con = container_of(work, struct ucsi_connector,
work);
struct ucsi *ucsi = con->ucsi;
enum typec_role role;
u64 command;
int ret;
mutex_lock(&con->lock);
if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags))
dev_err_once(ucsi->dev, "%s entered without EVENT_PENDING\n",
__func__);
command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command_common(ucsi, command, &con->status,
sizeof(con->status), true);
if (ret < 0) {
dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n",
__func__, ret);
clear_bit(EVENT_PENDING, &con->ucsi->flags);
goto out_unlock;
}
trace_ucsi_connector_change(con->num, &con->status);
if (ucsi->ops->connector_status)
ucsi->ops->connector_status(con);
role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR);
if (con->status.change & UCSI_CONSTAT_POWER_DIR_CHANGE) {
typec_set_pwr_role(con->port, role);
/* Complete pending power role swap */
if (!completion_done(&con->complete))
complete(&con->complete);
}
if (con->status.change & UCSI_CONSTAT_CONNECT_CHANGE) {
typec_set_pwr_role(con->port, role);
ucsi_port_psy_changed(con);
ucsi_partner_change(con);
if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
ucsi_register_partner(con);
ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
UCSI_CONSTAT_PWR_OPMODE_PD) {
ucsi_partner_task(con, ucsi_register_partner_pdos, 1, HZ);
ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
}
} else {
ucsi_unregister_partner(con);
}
}
if (con->status.change & UCSI_CONSTAT_POWER_OPMODE_CHANGE ||
con->status.change & UCSI_CONSTAT_POWER_LEVEL_CHANGE)
ucsi_pwr_opmode_change(con);
if (con->partner && con->status.change & UCSI_CONSTAT_PARTNER_CHANGE) {
ucsi_partner_change(con);
/* Complete pending data role swap */
if (!completion_done(&con->complete))
complete(&con->complete);
}
if (con->status.change & UCSI_CONSTAT_CAM_CHANGE)
ucsi_partner_task(con, ucsi_check_altmodes, 1, HZ);
if (con->status.change & UCSI_CONSTAT_BC_CHANGE)
ucsi_port_psy_changed(con);
out_unlock:
mutex_unlock(&con->lock);
}
/**
* ucsi_connector_change - Process Connector Change Event
* @ucsi: UCSI Interface
* @num: Connector number
*/
void ucsi_connector_change(struct ucsi *ucsi, u8 num)
{
struct ucsi_connector *con = &ucsi->connector[num - 1];
if (!(ucsi->ntfy & UCSI_ENABLE_NTFY_CONNECTOR_CHANGE)) {
dev_dbg(ucsi->dev, "Early connector change event\n");
return;
}
if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags))
schedule_work(&con->work);
}
EXPORT_SYMBOL_GPL(ucsi_connector_change);
/* -------------------------------------------------------------------------- */
/*
* Hard Reset bit field was defined with value 1 in UCSI spec version 1.0.
* Starting with spec version 1.1, Hard Reset bit field was removed from the
* CONNECTOR_RESET command, until spec 2.0 reintroduced it with value 0, so, in effect,
* the value to pass in to the command for a Hard Reset is different depending
* on the supported UCSI version by the LPM.
*
* For performing a Data Reset on LPMs supporting version 2.0 and greater,
* this function needs to be called with the second argument set to 0.
*/
static int ucsi_reset_connector(struct ucsi_connector *con, bool hard)
{
u64 command;
command = UCSI_CONNECTOR_RESET | UCSI_CONNECTOR_NUMBER(con->num);
if (con->ucsi->version < UCSI_VERSION_1_1)
command |= hard ? UCSI_CONNECTOR_RESET_HARD_VER_1_0 : 0;
else if (con->ucsi->version >= UCSI_VERSION_2_0)
command |= hard ? 0 : UCSI_CONNECTOR_RESET_DATA_VER_2_0;
return ucsi_send_command(con->ucsi, command, NULL, 0);
}
static int ucsi_reset_ppm(struct ucsi *ucsi)
{
u64 command;
unsigned long tmo;
u32 cci;
int ret;
mutex_lock(&ucsi->ppm_lock);
ret = ucsi->ops->read_cci(ucsi, &cci);
if (ret < 0)
goto out;
/*
* If UCSI_CCI_RESET_COMPLETE is already set we must clear
* the flag before we start another reset. Send a
* UCSI_SET_NOTIFICATION_ENABLE command to achieve this.
* Ignore a timeout and try the reset anyway if this fails.
*/
if (cci & UCSI_CCI_RESET_COMPLETE) {
command = UCSI_SET_NOTIFICATION_ENABLE;
ret = ucsi->ops->async_control(ucsi, command);
if (ret < 0)
goto out;
tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS);
do {
ret = ucsi->ops->read_cci(ucsi, &cci);
if (ret < 0)
goto out;
if (cci & UCSI_CCI_COMMAND_COMPLETE)
break;
if (time_is_before_jiffies(tmo))
break;
msleep(20);
} while (1);
WARN_ON(cci & UCSI_CCI_RESET_COMPLETE);
}
command = UCSI_PPM_RESET;
ret = ucsi->ops->async_control(ucsi, command);
if (ret < 0)
goto out;
tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS);
do {
if (time_is_before_jiffies(tmo)) {
ret = -ETIMEDOUT;
goto out;
}
/* Give the PPM time to process a reset before reading CCI */
msleep(20);
ret = ucsi->ops->read_cci(ucsi, &cci);
if (ret)
goto out;
/* If the PPM is still doing something else, reset it again. */
if (cci & ~UCSI_CCI_RESET_COMPLETE) {
ret = ucsi->ops->async_control(ucsi, command);
if (ret < 0)
goto out;
}
} while (!(cci & UCSI_CCI_RESET_COMPLETE));
out:
mutex_unlock(&ucsi->ppm_lock);
return ret;
}
static int ucsi_role_cmd(struct ucsi_connector *con, u64 command)
{
int ret;
ret = ucsi_send_command(con->ucsi, command, NULL, 0);
if (ret == -ETIMEDOUT) {
u64 c;
/* PPM most likely stopped responding. Resetting everything. */
ucsi_reset_ppm(con->ucsi);
c = UCSI_SET_NOTIFICATION_ENABLE | con->ucsi->ntfy;
ucsi_send_command(con->ucsi, c, NULL, 0);
ucsi_reset_connector(con, true);
}
return ret;
}
static int ucsi_dr_swap(struct typec_port *port, enum typec_data_role role)
{
struct ucsi_connector *con = typec_get_drvdata(port);
u8 partner_type;
u64 command;
int ret = 0;
mutex_lock(&con->lock);
if (!con->partner) {
ret = -ENOTCONN;
goto out_unlock;
}
partner_type = UCSI_CONSTAT_PARTNER_TYPE(con->status.flags);
if ((partner_type == UCSI_CONSTAT_PARTNER_TYPE_DFP &&
role == TYPEC_DEVICE) ||
(partner_type == UCSI_CONSTAT_PARTNER_TYPE_UFP &&
role == TYPEC_HOST))
goto out_unlock;
reinit_completion(&con->complete);
command = UCSI_SET_UOR | UCSI_CONNECTOR_NUMBER(con->num);
command |= UCSI_SET_UOR_ROLE(role);
command |= UCSI_SET_UOR_ACCEPT_ROLE_SWAPS;
ret = ucsi_role_cmd(con, command);
if (ret < 0)
goto out_unlock;
mutex_unlock(&con->lock);
if (!wait_for_completion_timeout(&con->complete,
msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
return -ETIMEDOUT;
return 0;
out_unlock:
mutex_unlock(&con->lock);
return ret;
}
static int ucsi_pr_swap(struct typec_port *port, enum typec_role role)
{
struct ucsi_connector *con = typec_get_drvdata(port);
enum typec_role cur_role;
u64 command;
int ret = 0;
mutex_lock(&con->lock);
if (!con->partner) {
ret = -ENOTCONN;
goto out_unlock;
}
cur_role = !!(con->status.flags & UCSI_CONSTAT_PWR_DIR);
if (cur_role == role)
goto out_unlock;
reinit_completion(&con->complete);
command = UCSI_SET_PDR | UCSI_CONNECTOR_NUMBER(con->num);
command |= UCSI_SET_PDR_ROLE(role);
command |= UCSI_SET_PDR_ACCEPT_ROLE_SWAPS;
ret = ucsi_role_cmd(con, command);
if (ret < 0)
goto out_unlock;
mutex_unlock(&con->lock);
if (!wait_for_completion_timeout(&con->complete,
msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
return -ETIMEDOUT;
mutex_lock(&con->lock);
/* Something has gone wrong while swapping the role */
if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) !=
UCSI_CONSTAT_PWR_OPMODE_PD) {
ucsi_reset_connector(con, true);
ret = -EPROTO;
}
out_unlock:
mutex_unlock(&con->lock);
return ret;
}
static const struct typec_operations ucsi_ops = {
.dr_set = ucsi_dr_swap,
.pr_set = ucsi_pr_swap
};
/* Caller must call fwnode_handle_put() after use */
static struct fwnode_handle *ucsi_find_fwnode(struct ucsi_connector *con)
{
struct fwnode_handle *fwnode;
int i = 1;
device_for_each_child_node(con->ucsi->dev, fwnode)
if (i++ == con->num)
return fwnode;
return NULL;
}
static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
{
struct typec_capability *cap = &con->typec_cap;
enum typec_accessory *accessory = cap->accessory;
enum usb_role u_role = USB_ROLE_NONE;
u64 command;
char *name;
int ret;
name = kasprintf(GFP_KERNEL, "%s-con%d", dev_name(ucsi->dev), con->num);
if (!name)
return -ENOMEM;
con->wq = create_singlethread_workqueue(name);
kfree(name);
if (!con->wq)
return -ENOMEM;
INIT_WORK(&con->work, ucsi_handle_connector_change);
init_completion(&con->complete);
mutex_init(&con->lock);
INIT_LIST_HEAD(&con->partner_tasks);
con->ucsi = ucsi;
cap->fwnode = ucsi_find_fwnode(con);
con->usb_role_sw = fwnode_usb_role_switch_get(cap->fwnode);
if (IS_ERR(con->usb_role_sw))
return dev_err_probe(ucsi->dev, PTR_ERR(con->usb_role_sw),
"con%d: failed to get usb role switch\n", con->num);
/* Delay other interactions with the con until registration is complete */
mutex_lock(&con->lock);
/* Get connector capability */
command = UCSI_GET_CONNECTOR_CAPABILITY;
command |= UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command(ucsi, command, &con->cap, sizeof(con->cap));
if (ret < 0)
goto out_unlock;
if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DRP)
cap->data = TYPEC_PORT_DRD;
else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DFP)
cap->data = TYPEC_PORT_DFP;
else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_UFP)
cap->data = TYPEC_PORT_UFP;
if ((con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER) &&
(con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER))
cap->type = TYPEC_PORT_DRP;
else if (con->cap.flags & UCSI_CONCAP_FLAG_PROVIDER)
cap->type = TYPEC_PORT_SRC;
else if (con->cap.flags & UCSI_CONCAP_FLAG_CONSUMER)
cap->type = TYPEC_PORT_SNK;
cap->revision = ucsi->cap.typec_version;
cap->pd_revision = ucsi->cap.pd_version;
cap->svdm_version = SVDM_VER_2_0;
cap->prefer_role = TYPEC_NO_PREFERRED_ROLE;
if (con->cap.op_mode & UCSI_CONCAP_OPMODE_AUDIO_ACCESSORY)
*accessory++ = TYPEC_ACCESSORY_AUDIO;
if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DEBUG_ACCESSORY)
*accessory = TYPEC_ACCESSORY_DEBUG;
cap->driver_data = con;
cap->ops = &ucsi_ops;
if (ucsi->ops->update_connector)
ucsi->ops->update_connector(con);
ret = ucsi_register_port_psy(con);
if (ret)
goto out;
/* Register the connector */
con->port = typec_register_port(ucsi->dev, cap);
if (IS_ERR(con->port)) {
ret = PTR_ERR(con->port);
goto out;
}
if (!(ucsi->quirks & UCSI_DELAY_DEVICE_PDOS))
ucsi_register_device_pdos(con);
/* Alternate modes */
ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_CON);
if (ret) {
dev_err(ucsi->dev, "con%d: failed to register alt modes\n",
con->num);
goto out;
}
/* Get the status */
command = UCSI_GET_CONNECTOR_STATUS | UCSI_CONNECTOR_NUMBER(con->num);
ret = ucsi_send_command(ucsi, command, &con->status, sizeof(con->status));
if (ret < 0) {
dev_err(ucsi->dev, "con%d: failed to get status\n", con->num);
ret = 0;
goto out;
}
ret = 0; /* ucsi_send_command() returns length on success */
if (ucsi->ops->connector_status)
ucsi->ops->connector_status(con);
switch (UCSI_CONSTAT_PARTNER_TYPE(con->status.flags)) {
case UCSI_CONSTAT_PARTNER_TYPE_UFP:
case UCSI_CONSTAT_PARTNER_TYPE_CABLE_AND_UFP:
u_role = USB_ROLE_HOST;
fallthrough;
case UCSI_CONSTAT_PARTNER_TYPE_CABLE:
typec_set_data_role(con->port, TYPEC_HOST);
break;
case UCSI_CONSTAT_PARTNER_TYPE_DFP:
u_role = USB_ROLE_DEVICE;
typec_set_data_role(con->port, TYPEC_DEVICE);
break;
default:
break;
}
/* Check if there is already something connected */
if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
typec_set_pwr_role(con->port,
!!(con->status.flags & UCSI_CONSTAT_PWR_DIR));
ucsi_register_partner(con);
ucsi_pwr_opmode_change(con);
ucsi_port_psy_changed(con);
if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
ucsi_get_partner_identity(con);
if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
ucsi_check_cable(con);
}
/* Only notify USB controller if partner supports USB data */
if (!(UCSI_CONSTAT_PARTNER_FLAGS(con->status.flags) & UCSI_CONSTAT_PARTNER_FLAG_USB))
u_role = USB_ROLE_NONE;
ret = usb_role_switch_set_role(con->usb_role_sw, u_role);
if (ret) {
dev_err(ucsi->dev, "con:%d: failed to set usb role:%d\n",
con->num, u_role);
ret = 0;
}
if (con->partner &&
UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
UCSI_CONSTAT_PWR_OPMODE_PD) {
ucsi_register_device_pdos(con);
ucsi_get_src_pdos(con);
ucsi_check_altmodes(con);
ucsi_check_connector_capability(con);
}
trace_ucsi_register_port(con->num, &con->status);
out:
fwnode_handle_put(cap->fwnode);
out_unlock:
mutex_unlock(&con->lock);
if (ret && con->wq) {
destroy_workqueue(con->wq);
con->wq = NULL;
}
return ret;
}
static u64 ucsi_get_supported_notifications(struct ucsi *ucsi)
{
u16 features = ucsi->cap.features;
u64 ntfy = UCSI_ENABLE_NTFY_ALL;
if (!(features & UCSI_CAP_ALT_MODE_DETAILS))
ntfy &= ~UCSI_ENABLE_NTFY_CAM_CHANGE;
if (!(features & UCSI_CAP_PDO_DETAILS))
ntfy &= ~(UCSI_ENABLE_NTFY_PWR_LEVEL_CHANGE |
UCSI_ENABLE_NTFY_CAP_CHANGE);
if (!(features & UCSI_CAP_EXT_SUPPLY_NOTIFICATIONS))
ntfy &= ~UCSI_ENABLE_NTFY_EXT_PWR_SRC_CHANGE;
if (!(features & UCSI_CAP_PD_RESET))
ntfy &= ~UCSI_ENABLE_NTFY_PD_RESET_COMPLETE;
if (ucsi->version <= UCSI_VERSION_1_2)
return ntfy;
ntfy |= UCSI_ENABLE_NTFY_SINK_PATH_STS_CHANGE;
if (features & UCSI_CAP_GET_ATTENTION_VDO)
ntfy |= UCSI_ENABLE_NTFY_ATTENTION;
if (features & UCSI_CAP_FW_UPDATE_REQUEST)
ntfy |= UCSI_ENABLE_NTFY_LPM_FW_UPDATE_REQ;
if (features & UCSI_CAP_SECURITY_REQUEST)
ntfy |= UCSI_ENABLE_NTFY_SECURITY_REQ_PARTNER;
if (features & UCSI_CAP_SET_RETIMER_MODE)
ntfy |= UCSI_ENABLE_NTFY_SET_RETIMER_MODE;
return ntfy;
}
/**
* ucsi_init - Initialize UCSI interface
* @ucsi: UCSI to be initialized
*
* Registers all ports @ucsi has and enables all notification events.
*/
static int ucsi_init(struct ucsi *ucsi)
{
struct ucsi_connector *con, *connector;
u64 command, ntfy;
u32 cci;
int ret;
int i;
/* Reset the PPM */
ret = ucsi_reset_ppm(ucsi);
if (ret) {
dev_err(ucsi->dev, "failed to reset PPM!\n");
goto err;
}
/* Enable basic notifications */
ntfy = UCSI_ENABLE_NTFY_CMD_COMPLETE | UCSI_ENABLE_NTFY_ERROR;
command = UCSI_SET_NOTIFICATION_ENABLE | ntfy;
ret = ucsi_send_command(ucsi, command, NULL, 0);
if (ret < 0)
goto err_reset;
/* Get PPM capabilities */
command = UCSI_GET_CAPABILITY;
ret = ucsi_send_command(ucsi, command, &ucsi->cap, sizeof(ucsi->cap));
if (ret < 0)
goto err_reset;
if (!ucsi->cap.num_connectors) {
ret = -ENODEV;
goto err_reset;
}
/* Allocate the connectors. Released in ucsi_unregister() */
connector = kcalloc(ucsi->cap.num_connectors + 1, sizeof(*connector), GFP_KERNEL);
if (!connector) {
ret = -ENOMEM;
goto err_reset;
}
/* Register all connectors */
for (i = 0; i < ucsi->cap.num_connectors; i++) {
connector[i].num = i + 1;
ret = ucsi_register_port(ucsi, &connector[i]);
if (ret)
goto err_unregister;
}
/* Enable all supported notifications */
ntfy = ucsi_get_supported_notifications(ucsi);
command = UCSI_SET_NOTIFICATION_ENABLE | ntfy;
ret = ucsi_send_command(ucsi, command, NULL, 0);
if (ret < 0)
goto err_unregister;
ucsi->connector = connector;
ucsi->ntfy = ntfy;
mutex_lock(&ucsi->ppm_lock);
ret = ucsi->ops->read_cci(ucsi, &cci);
mutex_unlock(&ucsi->ppm_lock);
if (ret)
return ret;
if (UCSI_CCI_CONNECTOR(cci))
ucsi_connector_change(ucsi, UCSI_CCI_CONNECTOR(cci));
return 0;
err_unregister:
for (con = connector; con->port; con++) {
ucsi_unregister_partner(con);
ucsi_unregister_altmodes(con, UCSI_RECIPIENT_CON);
ucsi_unregister_port_psy(con);
if (con->wq)
destroy_workqueue(con->wq);
usb_power_delivery_unregister_capabilities(con->port_sink_caps);
con->port_sink_caps = NULL;
usb_power_delivery_unregister_capabilities(con->port_source_caps);
con->port_source_caps = NULL;
usb_power_delivery_unregister(con->pd);
con->pd = NULL;
typec_unregister_port(con->port);
con->port = NULL;
}
kfree(connector);
err_reset:
memset(&ucsi->cap, 0, sizeof(ucsi->cap));
ucsi_reset_ppm(ucsi);
err:
return ret;
}
static void ucsi_resume_work(struct work_struct *work)
{
struct ucsi *ucsi = container_of(work, struct ucsi, resume_work);
struct ucsi_connector *con;
u64 command;
int ret;
/* Restore UCSI notification enable mask after system resume */
command = UCSI_SET_NOTIFICATION_ENABLE | ucsi->ntfy;
ret = ucsi_send_command(ucsi, command, NULL, 0);
if (ret < 0) {
dev_err(ucsi->dev, "failed to re-enable notifications (%d)\n", ret);
return;
}
for (con = ucsi->connector; con->port; con++) {
mutex_lock(&con->lock);
ucsi_partner_task(con, ucsi_check_connection, 1, 0);
mutex_unlock(&con->lock);
}
}
int ucsi_resume(struct ucsi *ucsi)
{
if (ucsi->connector)
queue_work(system_long_wq, &ucsi->resume_work);
return 0;
}
EXPORT_SYMBOL_GPL(ucsi_resume);
static void ucsi_init_work(struct work_struct *work)
{
struct ucsi *ucsi = container_of(work, struct ucsi, work.work);
int ret;
ret = ucsi_init(ucsi);
if (ret)
dev_err_probe(ucsi->dev, ret, "PPM init failed\n");
if (ret == -EPROBE_DEFER) {
if (ucsi->work_count++ > UCSI_ROLE_SWITCH_WAIT_COUNT) {
dev_err(ucsi->dev, "PPM init failed, stop trying\n");
return;
}
queue_delayed_work(system_long_wq, &ucsi->work,
UCSI_ROLE_SWITCH_INTERVAL);
}
}
/**
* ucsi_get_drvdata - Return private driver data pointer
* @ucsi: UCSI interface
*/
void *ucsi_get_drvdata(struct ucsi *ucsi)
{
return ucsi->driver_data;
}
EXPORT_SYMBOL_GPL(ucsi_get_drvdata);
/**
* ucsi_set_drvdata - Assign private driver data pointer
* @ucsi: UCSI interface
* @data: Private data pointer
*/
void ucsi_set_drvdata(struct ucsi *ucsi, void *data)
{
ucsi->driver_data = data;
}
EXPORT_SYMBOL_GPL(ucsi_set_drvdata);
/**
* ucsi_create - Allocate UCSI instance
* @dev: Device interface to the PPM (Platform Policy Manager)
* @ops: I/O routines
*/
struct ucsi *ucsi_create(struct device *dev, const struct ucsi_operations *ops)
{
struct ucsi *ucsi;
if (!ops ||
!ops->read_version || !ops->read_cci || !ops->read_message_in ||
!ops->sync_control || !ops->async_control)
return ERR_PTR(-EINVAL);
ucsi = kzalloc(sizeof(*ucsi), GFP_KERNEL);
if (!ucsi)
return ERR_PTR(-ENOMEM);
INIT_WORK(&ucsi->resume_work, ucsi_resume_work);
INIT_DELAYED_WORK(&ucsi->work, ucsi_init_work);
mutex_init(&ucsi->ppm_lock);
init_completion(&ucsi->complete);
ucsi->dev = dev;
ucsi->ops = ops;
return ucsi;
}
EXPORT_SYMBOL_GPL(ucsi_create);
/**
* ucsi_destroy - Free UCSI instance
* @ucsi: UCSI instance to be freed
*/
void ucsi_destroy(struct ucsi *ucsi)
{
ucsi_debugfs_unregister(ucsi);
kfree(ucsi);
}
EXPORT_SYMBOL_GPL(ucsi_destroy);
/**
* ucsi_register - Register UCSI interface
* @ucsi: UCSI instance
*/
int ucsi_register(struct ucsi *ucsi)
{
int ret;
ret = ucsi->ops->read_version(ucsi, &ucsi->version);
if (ret)
return ret;
if (!ucsi->version)
return -ENODEV;
/*
* Version format is JJ.M.N (JJ = Major version, M = Minor version,
* N = sub-minor version).
*/
dev_dbg(ucsi->dev, "Registered UCSI interface with version %x.%x.%x",
UCSI_BCD_GET_MAJOR(ucsi->version),
UCSI_BCD_GET_MINOR(ucsi->version),
UCSI_BCD_GET_SUBMINOR(ucsi->version));
queue_delayed_work(system_long_wq, &ucsi->work, 0);
ucsi_debugfs_register(ucsi);
return 0;
}
EXPORT_SYMBOL_GPL(ucsi_register);
/**
* ucsi_unregister - Unregister UCSI interface
* @ucsi: UCSI interface to be unregistered
*
* Unregister UCSI interface that was created with ucsi_register().
*/
void ucsi_unregister(struct ucsi *ucsi)
{
u64 cmd = UCSI_SET_NOTIFICATION_ENABLE;
int i;
/* Make sure that we are not in the middle of driver initialization */
cancel_delayed_work_sync(&ucsi->work);
cancel_work_sync(&ucsi->resume_work);
/* Disable notifications */
ucsi->ops->async_control(ucsi, cmd);
if (!ucsi->connector)
return;
for (i = 0; i < ucsi->cap.num_connectors; i++) {
cancel_work_sync(&ucsi->connector[i].work);
ucsi_unregister_partner(&ucsi->connector[i]);
ucsi_unregister_altmodes(&ucsi->connector[i],
UCSI_RECIPIENT_CON);
ucsi_unregister_port_psy(&ucsi->connector[i]);
if (ucsi->connector[i].wq) {
struct ucsi_work *uwork;
mutex_lock(&ucsi->connector[i].lock);
/*
* queue delayed items immediately so they can execute
* and free themselves before the wq is destroyed
*/
list_for_each_entry(uwork, &ucsi->connector[i].partner_tasks, node)
mod_delayed_work(ucsi->connector[i].wq, &uwork->work, 0);
mutex_unlock(&ucsi->connector[i].lock);
destroy_workqueue(ucsi->connector[i].wq);
}
usb_power_delivery_unregister_capabilities(ucsi->connector[i].port_sink_caps);
ucsi->connector[i].port_sink_caps = NULL;
usb_power_delivery_unregister_capabilities(ucsi->connector[i].port_source_caps);
ucsi->connector[i].port_source_caps = NULL;
usb_power_delivery_unregister(ucsi->connector[i].pd);
ucsi->connector[i].pd = NULL;
typec_unregister_port(ucsi->connector[i].port);
}
kfree(ucsi->connector);
}
EXPORT_SYMBOL_GPL(ucsi_unregister);
static int __init ucsi_module_init(void)
{
ucsi_debugfs_init();
return 0;
}
module_init(ucsi_module_init);
static void __exit ucsi_module_exit(void)
{
ucsi_debugfs_exit();
}
module_exit(ucsi_module_exit);
MODULE_AUTHOR("Heikki Krogerus <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("USB Type-C Connector System Software Interface driver");
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