blob: d6e299ff28cfd09e72abcbb8b6838c35e908f5bb [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
/*
* USB Type-C Connector System Software Interface driver
*
* Copyright (C) 2017, Intel Corporation
* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#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.h>
#include "ucsi.h"
#include "trace.h"
#define to_ucsi_connector(_cap_) container_of(_cap_, struct ucsi_connector, \
typec_cap)
/*
* 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
enum ucsi_status {
UCSI_IDLE = 0,
UCSI_BUSY,
UCSI_ERROR,
};
struct ucsi_connector {
int num;
struct ucsi *ucsi;
struct work_struct work;
struct completion complete;
struct typec_port *port;
struct typec_partner *partner;
struct typec_capability typec_cap;
struct ucsi_connector_status status;
struct ucsi_connector_capability cap;
};
struct ucsi {
struct device *dev;
struct ucsi_ppm *ppm;
enum ucsi_status status;
struct completion complete;
struct ucsi_capability cap;
struct ucsi_connector *connector;
struct work_struct work;
/* PPM Communication lock */
struct mutex ppm_lock;
/* PPM communication flags */
unsigned long flags;
#define EVENT_PENDING 0
#define COMMAND_PENDING 1
#define ACK_PENDING 2
};
static inline int ucsi_sync(struct ucsi *ucsi)
{
if (ucsi->ppm && ucsi->ppm->sync)
return ucsi->ppm->sync(ucsi->ppm);
return 0;
}
static int ucsi_command(struct ucsi *ucsi, struct ucsi_control *ctrl)
{
int ret;
trace_ucsi_command(ctrl);
set_bit(COMMAND_PENDING, &ucsi->flags);
ret = ucsi->ppm->cmd(ucsi->ppm, ctrl);
if (ret)
goto err_clear_flag;
if (!wait_for_completion_timeout(&ucsi->complete,
msecs_to_jiffies(UCSI_TIMEOUT_MS))) {
dev_warn(ucsi->dev, "PPM NOT RESPONDING\n");
ret = -ETIMEDOUT;
}
err_clear_flag:
clear_bit(COMMAND_PENDING, &ucsi->flags);
return ret;
}
static int ucsi_ack(struct ucsi *ucsi, u8 ack)
{
struct ucsi_control ctrl;
int ret;
trace_ucsi_ack(ack);
set_bit(ACK_PENDING, &ucsi->flags);
UCSI_CMD_ACK(ctrl, ack);
ret = ucsi->ppm->cmd(ucsi->ppm, &ctrl);
if (ret)
goto out_clear_bit;
/* Waiting for ACK with ACK CMD, but not with EVENT for now */
if (ack == UCSI_ACK_EVENT)
goto out_clear_bit;
if (!wait_for_completion_timeout(&ucsi->complete,
msecs_to_jiffies(UCSI_TIMEOUT_MS)))
ret = -ETIMEDOUT;
out_clear_bit:
clear_bit(ACK_PENDING, &ucsi->flags);
if (ret)
dev_err(ucsi->dev, "%s: failed\n", __func__);
return ret;
}
static int ucsi_run_command(struct ucsi *ucsi, struct ucsi_control *ctrl,
void *data, size_t size)
{
struct ucsi_control _ctrl;
u8 data_length;
u16 error;
int ret;
ret = ucsi_command(ucsi, ctrl);
if (ret)
goto err;
switch (ucsi->status) {
case UCSI_IDLE:
ret = ucsi_sync(ucsi);
if (ret)
dev_warn(ucsi->dev, "%s: sync failed\n", __func__);
if (data)
memcpy(data, ucsi->ppm->data->message_in, size);
data_length = ucsi->ppm->data->cci.data_length;
ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
if (!ret)
ret = data_length;
break;
case UCSI_BUSY:
/* The caller decides whether to cancel or not */
ret = -EBUSY;
break;
case UCSI_ERROR:
ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
if (ret)
break;
_ctrl.raw_cmd = 0;
_ctrl.cmd.cmd = UCSI_GET_ERROR_STATUS;
ret = ucsi_command(ucsi, &_ctrl);
if (ret) {
dev_err(ucsi->dev, "reading error failed!\n");
break;
}
memcpy(&error, ucsi->ppm->data->message_in, sizeof(error));
/* Something has really gone wrong */
if (WARN_ON(ucsi->status == UCSI_ERROR)) {
ret = -ENODEV;
break;
}
ret = ucsi_ack(ucsi, UCSI_ACK_CMD);
if (ret)
break;
switch (error) {
case UCSI_ERROR_INCOMPATIBLE_PARTNER:
ret = -EOPNOTSUPP;
break;
case UCSI_ERROR_CC_COMMUNICATION_ERR:
ret = -ECOMM;
break;
case UCSI_ERROR_CONTRACT_NEGOTIATION_FAIL:
ret = -EPROTO;
break;
case UCSI_ERROR_DEAD_BATTERY:
dev_warn(ucsi->dev, "Dead battery condition!\n");
ret = -EPERM;
break;
/* The following mean a bug in this driver */
case UCSI_ERROR_INVALID_CON_NUM:
case UCSI_ERROR_UNREGONIZED_CMD:
case UCSI_ERROR_INVALID_CMD_ARGUMENT:
dev_warn(ucsi->dev,
"%s: possible UCSI driver bug - error 0x%x\n",
__func__, error);
ret = -EINVAL;
break;
default:
dev_warn(ucsi->dev,
"%s: error without status\n", __func__);
ret = -EIO;
break;
}
break;
}
err:
trace_ucsi_run_command(ctrl, ret);
return ret;
}
/* -------------------------------------------------------------------------- */
static void ucsi_pwr_opmode_change(struct ucsi_connector *con)
{
switch (con->status.pwr_op_mode) {
case UCSI_CONSTAT_PWR_OPMODE_PD:
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_PD);
break;
case UCSI_CONSTAT_PWR_OPMODE_TYPEC1_5:
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_1_5A);
break;
case UCSI_CONSTAT_PWR_OPMODE_TYPEC3_0:
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_3_0A);
break;
default:
typec_set_pwr_opmode(con->port, TYPEC_PWR_MODE_USB);
break;
}
}
static int ucsi_register_partner(struct ucsi_connector *con)
{
struct typec_partner_desc partner;
if (con->partner)
return 0;
memset(&partner, 0, sizeof(partner));
switch (con->status.partner_type) {
case UCSI_CONSTAT_PARTNER_TYPE_DEBUG:
partner.accessory = TYPEC_ACCESSORY_DEBUG;
break;
case UCSI_CONSTAT_PARTNER_TYPE_AUDIO:
partner.accessory = TYPEC_ACCESSORY_AUDIO;
break;
default:
break;
}
partner.usb_pd = con->status.pwr_op_mode == UCSI_CONSTAT_PWR_OPMODE_PD;
con->partner = typec_register_partner(con->port, &partner);
if (!con->partner) {
dev_err(con->ucsi->dev, "con%d: failed to register partner\n",
con->num);
return -ENODEV;
}
return 0;
}
static void ucsi_unregister_partner(struct ucsi_connector *con)
{
typec_unregister_partner(con->partner);
con->partner = NULL;
}
static void ucsi_connector_change(struct work_struct *work)
{
struct ucsi_connector *con = container_of(work, struct ucsi_connector,
work);
struct ucsi *ucsi = con->ucsi;
struct ucsi_control ctrl;
int ret;
mutex_lock(&ucsi->ppm_lock);
UCSI_CMD_GET_CONNECTOR_STATUS(ctrl, con->num);
ret = ucsi_run_command(ucsi, &ctrl, &con->status, sizeof(con->status));
if (ret < 0) {
dev_err(ucsi->dev, "%s: GET_CONNECTOR_STATUS failed (%d)\n",
__func__, ret);
goto out_unlock;
}
if (con->status.change & UCSI_CONSTAT_POWER_OPMODE_CHANGE)
ucsi_pwr_opmode_change(con);
if (con->status.change & UCSI_CONSTAT_POWER_DIR_CHANGE) {
typec_set_pwr_role(con->port, con->status.pwr_dir);
/* Complete pending power role swap */
if (!completion_done(&con->complete))
complete(&con->complete);
}
if (con->status.change & UCSI_CONSTAT_PARTNER_CHANGE) {
switch (con->status.partner_type) {
case UCSI_CONSTAT_PARTNER_TYPE_UFP:
typec_set_data_role(con->port, TYPEC_HOST);
break;
case UCSI_CONSTAT_PARTNER_TYPE_DFP:
typec_set_data_role(con->port, TYPEC_DEVICE);
break;
default:
break;
}
/* Complete pending data role swap */
if (!completion_done(&con->complete))
complete(&con->complete);
}
if (con->status.change & UCSI_CONSTAT_CONNECT_CHANGE) {
typec_set_pwr_role(con->port, con->status.pwr_dir);
switch (con->status.partner_type) {
case UCSI_CONSTAT_PARTNER_TYPE_UFP:
typec_set_data_role(con->port, TYPEC_HOST);
break;
case UCSI_CONSTAT_PARTNER_TYPE_DFP:
typec_set_data_role(con->port, TYPEC_DEVICE);
break;
default:
break;
}
if (con->status.connected)
ucsi_register_partner(con);
else
ucsi_unregister_partner(con);
}
ret = ucsi_ack(ucsi, UCSI_ACK_EVENT);
if (ret)
dev_err(ucsi->dev, "%s: ACK failed (%d)", __func__, ret);
trace_ucsi_connector_change(con->num, &con->status);
out_unlock:
clear_bit(EVENT_PENDING, &ucsi->flags);
mutex_unlock(&ucsi->ppm_lock);
}
/**
* ucsi_notify - PPM notification handler
* @ucsi: Source UCSI Interface for the notifications
*
* Handle notifications from PPM of @ucsi.
*/
void ucsi_notify(struct ucsi *ucsi)
{
struct ucsi_cci *cci;
/* There is no requirement to sync here, but no harm either. */
ucsi_sync(ucsi);
cci = &ucsi->ppm->data->cci;
if (cci->error)
ucsi->status = UCSI_ERROR;
else if (cci->busy)
ucsi->status = UCSI_BUSY;
else
ucsi->status = UCSI_IDLE;
if (cci->cmd_complete && test_bit(COMMAND_PENDING, &ucsi->flags)) {
complete(&ucsi->complete);
} else if (cci->ack_complete && test_bit(ACK_PENDING, &ucsi->flags)) {
complete(&ucsi->complete);
} else if (cci->connector_change) {
struct ucsi_connector *con;
con = &ucsi->connector[cci->connector_change - 1];
if (!test_and_set_bit(EVENT_PENDING, &ucsi->flags))
schedule_work(&con->work);
}
trace_ucsi_notify(ucsi->ppm->data->raw_cci);
}
EXPORT_SYMBOL_GPL(ucsi_notify);
/* -------------------------------------------------------------------------- */
static int ucsi_reset_connector(struct ucsi_connector *con, bool hard)
{
struct ucsi_control ctrl;
UCSI_CMD_CONNECTOR_RESET(ctrl, con, hard);
return ucsi_run_command(con->ucsi, &ctrl, NULL, 0);
}
static int ucsi_reset_ppm(struct ucsi *ucsi)
{
struct ucsi_control ctrl;
unsigned long tmo;
int ret;
ctrl.raw_cmd = 0;
ctrl.cmd.cmd = UCSI_PPM_RESET;
trace_ucsi_command(&ctrl);
ret = ucsi->ppm->cmd(ucsi->ppm, &ctrl);
if (ret)
goto err;
tmo = jiffies + msecs_to_jiffies(UCSI_TIMEOUT_MS);
do {
/* Here sync is critical. */
ret = ucsi_sync(ucsi);
if (ret)
goto err;
if (ucsi->ppm->data->cci.reset_complete)
break;
/* If the PPM is still doing something else, reset it again. */
if (ucsi->ppm->data->raw_cci) {
dev_warn_ratelimited(ucsi->dev,
"Failed to reset PPM! Trying again..\n");
trace_ucsi_command(&ctrl);
ret = ucsi->ppm->cmd(ucsi->ppm, &ctrl);
if (ret)
goto err;
}
/* Letting the PPM settle down. */
msleep(20);
ret = -ETIMEDOUT;
} while (time_is_after_jiffies(tmo));
err:
trace_ucsi_reset_ppm(&ctrl, ret);
return ret;
}
static int ucsi_role_cmd(struct ucsi_connector *con, struct ucsi_control *ctrl)
{
int ret;
ret = ucsi_run_command(con->ucsi, ctrl, NULL, 0);
if (ret == -ETIMEDOUT) {
struct ucsi_control c;
/* PPM most likely stopped responding. Resetting everything. */
ucsi_reset_ppm(con->ucsi);
UCSI_CMD_SET_NTFY_ENABLE(c, UCSI_ENABLE_NTFY_ALL);
ucsi_run_command(con->ucsi, &c, NULL, 0);
ucsi_reset_connector(con, true);
}
return ret;
}
static int
ucsi_dr_swap(const struct typec_capability *cap, enum typec_data_role role)
{
struct ucsi_connector *con = to_ucsi_connector(cap);
struct ucsi_control ctrl;
int ret = 0;
if (!con->partner)
return -ENOTCONN;
mutex_lock(&con->ucsi->ppm_lock);
if ((con->status.partner_type == UCSI_CONSTAT_PARTNER_TYPE_DFP &&
role == TYPEC_DEVICE) ||
(con->status.partner_type == UCSI_CONSTAT_PARTNER_TYPE_UFP &&
role == TYPEC_HOST))
goto out_unlock;
UCSI_CMD_SET_UOR(ctrl, con, role);
ret = ucsi_role_cmd(con, &ctrl);
if (ret < 0)
goto out_unlock;
mutex_unlock(&con->ucsi->ppm_lock);
if (!wait_for_completion_timeout(&con->complete,
msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
return -ETIMEDOUT;
return 0;
out_unlock:
mutex_unlock(&con->ucsi->ppm_lock);
return ret;
}
static int
ucsi_pr_swap(const struct typec_capability *cap, enum typec_role role)
{
struct ucsi_connector *con = to_ucsi_connector(cap);
struct ucsi_control ctrl;
int ret = 0;
if (!con->partner)
return -ENOTCONN;
mutex_lock(&con->ucsi->ppm_lock);
if (con->status.pwr_dir == role)
goto out_unlock;
UCSI_CMD_SET_PDR(ctrl, con, role);
ret = ucsi_role_cmd(con, &ctrl);
if (ret < 0)
goto out_unlock;
mutex_unlock(&con->ucsi->ppm_lock);
if (!wait_for_completion_timeout(&con->complete,
msecs_to_jiffies(UCSI_SWAP_TIMEOUT_MS)))
return -ETIMEDOUT;
mutex_lock(&con->ucsi->ppm_lock);
/* Something has gone wrong while swapping the role */
if (con->status.pwr_op_mode != UCSI_CONSTAT_PWR_OPMODE_PD) {
ucsi_reset_connector(con, true);
ret = -EPROTO;
}
out_unlock:
mutex_unlock(&con->ucsi->ppm_lock);
return ret;
}
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, int index)
{
struct ucsi_connector *con = &ucsi->connector[index];
struct typec_capability *cap = &con->typec_cap;
enum typec_accessory *accessory = cap->accessory;
struct ucsi_control ctrl;
int ret;
INIT_WORK(&con->work, ucsi_connector_change);
init_completion(&con->complete);
con->num = index + 1;
con->ucsi = ucsi;
/* Get connector capability */
UCSI_CMD_GET_CONNECTOR_CAPABILITY(ctrl, con->num);
ret = ucsi_run_command(ucsi, &ctrl, &con->cap, sizeof(con->cap));
if (ret < 0)
return ret;
if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DRP)
cap->type = TYPEC_PORT_DRP;
else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_DFP)
cap->type = TYPEC_PORT_DFP;
else if (con->cap.op_mode & UCSI_CONCAP_OPMODE_UFP)
cap->type = TYPEC_PORT_UFP;
cap->revision = ucsi->cap.typec_version;
cap->pd_revision = ucsi->cap.pd_version;
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->fwnode = ucsi_find_fwnode(con);
cap->dr_set = ucsi_dr_swap;
cap->pr_set = ucsi_pr_swap;
/* Register the connector */
con->port = typec_register_port(ucsi->dev, cap);
if (!con->port)
return -ENODEV;
/* Get the status */
UCSI_CMD_GET_CONNECTOR_STATUS(ctrl, con->num);
ret = ucsi_run_command(ucsi, &ctrl, &con->status, sizeof(con->status));
if (ret < 0) {
dev_err(ucsi->dev, "con%d: failed to get status\n", con->num);
return 0;
}
ucsi_pwr_opmode_change(con);
typec_set_pwr_role(con->port, con->status.pwr_dir);
switch (con->status.partner_type) {
case UCSI_CONSTAT_PARTNER_TYPE_UFP:
typec_set_data_role(con->port, TYPEC_HOST);
break;
case UCSI_CONSTAT_PARTNER_TYPE_DFP:
typec_set_data_role(con->port, TYPEC_DEVICE);
break;
default:
break;
}
/* Check if there is already something connected */
if (con->status.connected)
ucsi_register_partner(con);
trace_ucsi_register_port(con->num, &con->status);
return 0;
}
static void ucsi_init(struct work_struct *work)
{
struct ucsi *ucsi = container_of(work, struct ucsi, work);
struct ucsi_connector *con;
struct ucsi_control ctrl;
int ret;
int i;
mutex_lock(&ucsi->ppm_lock);
/* Reset the PPM */
ret = ucsi_reset_ppm(ucsi);
if (ret) {
dev_err(ucsi->dev, "failed to reset PPM!\n");
goto err;
}
/* Enable basic notifications */
UCSI_CMD_SET_NTFY_ENABLE(ctrl, UCSI_ENABLE_NTFY_CMD_COMPLETE |
UCSI_ENABLE_NTFY_ERROR);
ret = ucsi_run_command(ucsi, &ctrl, NULL, 0);
if (ret < 0)
goto err_reset;
/* Get PPM capabilities */
UCSI_CMD_GET_CAPABILITY(ctrl);
ret = ucsi_run_command(ucsi, &ctrl, &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_ppm() */
ucsi->connector = kcalloc(ucsi->cap.num_connectors + 1,
sizeof(*ucsi->connector), GFP_KERNEL);
if (!ucsi->connector) {
ret = -ENOMEM;
goto err_reset;
}
/* Register all connectors */
for (i = 0; i < ucsi->cap.num_connectors; i++) {
ret = ucsi_register_port(ucsi, i);
if (ret)
goto err_unregister;
}
/* Enable all notifications */
UCSI_CMD_SET_NTFY_ENABLE(ctrl, UCSI_ENABLE_NTFY_ALL);
ret = ucsi_run_command(ucsi, &ctrl, NULL, 0);
if (ret < 0)
goto err_unregister;
mutex_unlock(&ucsi->ppm_lock);
return;
err_unregister:
for (con = ucsi->connector; con->port; con++) {
ucsi_unregister_partner(con);
typec_unregister_port(con->port);
con->port = NULL;
}
err_reset:
ucsi_reset_ppm(ucsi);
err:
mutex_unlock(&ucsi->ppm_lock);
dev_err(ucsi->dev, "PPM init failed (%d)\n", ret);
}
/**
* ucsi_register_ppm - Register UCSI PPM Interface
* @dev: Device interface to the PPM
* @ppm: The PPM interface
*
* Allocates UCSI instance, associates it with @ppm and returns it to the
* caller, and schedules initialization of the interface.
*/
struct ucsi *ucsi_register_ppm(struct device *dev, struct ucsi_ppm *ppm)
{
struct ucsi *ucsi;
ucsi = kzalloc(sizeof(*ucsi), GFP_KERNEL);
if (!ucsi)
return ERR_PTR(-ENOMEM);
INIT_WORK(&ucsi->work, ucsi_init);
init_completion(&ucsi->complete);
mutex_init(&ucsi->ppm_lock);
ucsi->dev = dev;
ucsi->ppm = ppm;
/*
* Communication with the PPM takes a lot of time. It is not reasonable
* to initialize the driver here. Using a work for now.
*/
queue_work(system_long_wq, &ucsi->work);
return ucsi;
}
EXPORT_SYMBOL_GPL(ucsi_register_ppm);
/**
* ucsi_unregister_ppm - Unregister UCSI PPM Interface
* @ucsi: struct ucsi associated with the PPM
*
* Unregister UCSI PPM that was created with ucsi_register().
*/
void ucsi_unregister_ppm(struct ucsi *ucsi)
{
struct ucsi_control ctrl;
int i;
/* Make sure that we are not in the middle of driver initialization */
cancel_work_sync(&ucsi->work);
mutex_lock(&ucsi->ppm_lock);
/* Disable everything except command complete notification */
UCSI_CMD_SET_NTFY_ENABLE(ctrl, UCSI_ENABLE_NTFY_CMD_COMPLETE)
ucsi_run_command(ucsi, &ctrl, NULL, 0);
mutex_unlock(&ucsi->ppm_lock);
for (i = 0; i < ucsi->cap.num_connectors; i++) {
cancel_work_sync(&ucsi->connector[i].work);
ucsi_unregister_partner(&ucsi->connector[i]);
typec_unregister_port(ucsi->connector[i].port);
}
ucsi_reset_ppm(ucsi);
kfree(ucsi->connector);
kfree(ucsi);
}
EXPORT_SYMBOL_GPL(ucsi_unregister_ppm);
MODULE_AUTHOR("Heikki Krogerus <heikki.krogerus@linux.intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("USB Type-C Connector System Software Interface driver");