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linux / linux / kernel / git / bpf / bpf / 242a6df688dcad7c55105280a79aaff83addf7ce / . / drivers / usb / typec / tcpm / tcpm.c
blob: f3087ef8265c2bea51d7bd3c03e6b4a0632cf26e [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2015-2017 Google, Inc
*
* USB Power Delivery protocol stack.
*/
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/power_supply.h>
#include <linux/proc_fs.h>
#include <linux/property.h>
#include <linux/sched/clock.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/usb.h>
#include <linux/usb/pd.h>
#include <linux/usb/pd_ado.h>
#include <linux/usb/pd_bdo.h>
#include <linux/usb/pd_ext_sdb.h>
#include <linux/usb/pd_vdo.h>
#include <linux/usb/role.h>
#include <linux/usb/tcpm.h>
#include <linux/usb/typec_altmode.h>
#include <linux/workqueue.h>
#define FOREACH_STATE(S) \
S(INVALID_STATE), \
S(TOGGLING), \
S(SRC_UNATTACHED), \
S(SRC_ATTACH_WAIT), \
S(SRC_ATTACHED), \
S(SRC_STARTUP), \
S(SRC_SEND_CAPABILITIES), \
S(SRC_SEND_CAPABILITIES_TIMEOUT), \
S(SRC_NEGOTIATE_CAPABILITIES), \
S(SRC_TRANSITION_SUPPLY), \
S(SRC_READY), \
S(SRC_WAIT_NEW_CAPABILITIES), \
\
S(SNK_UNATTACHED), \
S(SNK_ATTACH_WAIT), \
S(SNK_DEBOUNCED), \
S(SNK_ATTACHED), \
S(SNK_STARTUP), \
S(SNK_DISCOVERY), \
S(SNK_DISCOVERY_DEBOUNCE), \
S(SNK_DISCOVERY_DEBOUNCE_DONE), \
S(SNK_WAIT_CAPABILITIES), \
S(SNK_NEGOTIATE_CAPABILITIES), \
S(SNK_NEGOTIATE_PPS_CAPABILITIES), \
S(SNK_TRANSITION_SINK), \
S(SNK_TRANSITION_SINK_VBUS), \
S(SNK_READY), \
\
S(ACC_UNATTACHED), \
S(DEBUG_ACC_ATTACHED), \
S(AUDIO_ACC_ATTACHED), \
S(AUDIO_ACC_DEBOUNCE), \
\
S(HARD_RESET_SEND), \
S(HARD_RESET_START), \
S(SRC_HARD_RESET_VBUS_OFF), \
S(SRC_HARD_RESET_VBUS_ON), \
S(SNK_HARD_RESET_SINK_OFF), \
S(SNK_HARD_RESET_WAIT_VBUS), \
S(SNK_HARD_RESET_SINK_ON), \
\
S(SOFT_RESET), \
S(SOFT_RESET_SEND), \
\
S(DR_SWAP_ACCEPT), \
S(DR_SWAP_SEND), \
S(DR_SWAP_SEND_TIMEOUT), \
S(DR_SWAP_CANCEL), \
S(DR_SWAP_CHANGE_DR), \
\
S(PR_SWAP_ACCEPT), \
S(PR_SWAP_SEND), \
S(PR_SWAP_SEND_TIMEOUT), \
S(PR_SWAP_CANCEL), \
S(PR_SWAP_START), \
S(PR_SWAP_SRC_SNK_TRANSITION_OFF), \
S(PR_SWAP_SRC_SNK_SOURCE_OFF), \
S(PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED), \
S(PR_SWAP_SRC_SNK_SINK_ON), \
S(PR_SWAP_SNK_SRC_SINK_OFF), \
S(PR_SWAP_SNK_SRC_SOURCE_ON), \
S(PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP), \
\
S(VCONN_SWAP_ACCEPT), \
S(VCONN_SWAP_SEND), \
S(VCONN_SWAP_SEND_TIMEOUT), \
S(VCONN_SWAP_CANCEL), \
S(VCONN_SWAP_START), \
S(VCONN_SWAP_WAIT_FOR_VCONN), \
S(VCONN_SWAP_TURN_ON_VCONN), \
S(VCONN_SWAP_TURN_OFF_VCONN), \
\
S(SNK_TRY), \
S(SNK_TRY_WAIT), \
S(SNK_TRY_WAIT_DEBOUNCE), \
S(SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS), \
S(SRC_TRYWAIT), \
S(SRC_TRYWAIT_DEBOUNCE), \
S(SRC_TRYWAIT_UNATTACHED), \
\
S(SRC_TRY), \
S(SRC_TRY_WAIT), \
S(SRC_TRY_DEBOUNCE), \
S(SNK_TRYWAIT), \
S(SNK_TRYWAIT_DEBOUNCE), \
S(SNK_TRYWAIT_VBUS), \
S(BIST_RX), \
\
S(GET_STATUS_SEND), \
S(GET_STATUS_SEND_TIMEOUT), \
S(GET_PPS_STATUS_SEND), \
S(GET_PPS_STATUS_SEND_TIMEOUT), \
\
S(ERROR_RECOVERY), \
S(PORT_RESET), \
S(PORT_RESET_WAIT_OFF)
#define GENERATE_ENUM(e) e
#define GENERATE_STRING(s) #s
enum tcpm_state {
FOREACH_STATE(GENERATE_ENUM)
};
static const char * const tcpm_states[] = {
FOREACH_STATE(GENERATE_STRING)
};
enum vdm_states {
VDM_STATE_ERR_BUSY = -3,
VDM_STATE_ERR_SEND = -2,
VDM_STATE_ERR_TMOUT = -1,
VDM_STATE_DONE = 0,
/* Anything >0 represents an active state */
VDM_STATE_READY = 1,
VDM_STATE_BUSY = 2,
VDM_STATE_WAIT_RSP_BUSY = 3,
};
enum pd_msg_request {
PD_MSG_NONE = 0,
PD_MSG_CTRL_REJECT,
PD_MSG_CTRL_WAIT,
PD_MSG_CTRL_NOT_SUPP,
PD_MSG_DATA_SINK_CAP,
PD_MSG_DATA_SOURCE_CAP,
};
/* Events from low level driver */
#define TCPM_CC_EVENT BIT(0)
#define TCPM_VBUS_EVENT BIT(1)
#define TCPM_RESET_EVENT BIT(2)
#define LOG_BUFFER_ENTRIES 1024
#define LOG_BUFFER_ENTRY_SIZE 128
/* Alternate mode support */
#define SVID_DISCOVERY_MAX 16
#define ALTMODE_DISCOVERY_MAX (SVID_DISCOVERY_MAX * MODE_DISCOVERY_MAX)
struct pd_mode_data {
int svid_index; /* current SVID index */
int nsvids;
u16 svids[SVID_DISCOVERY_MAX];
int altmodes; /* number of alternate modes */
struct typec_altmode_desc altmode_desc[ALTMODE_DISCOVERY_MAX];
};
struct pd_pps_data {
u32 min_volt;
u32 max_volt;
u32 max_curr;
u32 out_volt;
u32 op_curr;
bool supported;
bool active;
};
struct tcpm_port {
struct device *dev;
struct mutex lock; /* tcpm state machine lock */
struct workqueue_struct *wq;
struct typec_capability typec_caps;
struct typec_port *typec_port;
struct tcpc_dev *tcpc;
struct usb_role_switch *role_sw;
enum typec_role vconn_role;
enum typec_role pwr_role;
enum typec_data_role data_role;
enum typec_pwr_opmode pwr_opmode;
struct usb_pd_identity partner_ident;
struct typec_partner_desc partner_desc;
struct typec_partner *partner;
enum typec_cc_status cc_req;
enum typec_cc_status cc1;
enum typec_cc_status cc2;
enum typec_cc_polarity polarity;
bool attached;
bool connected;
enum typec_port_type port_type;
bool vbus_present;
bool vbus_never_low;
bool vbus_source;
bool vbus_charge;
bool send_discover;
bool op_vsafe5v;
int try_role;
int try_snk_count;
int try_src_count;
enum pd_msg_request queued_message;
enum tcpm_state enter_state;
enum tcpm_state prev_state;
enum tcpm_state state;
enum tcpm_state delayed_state;
unsigned long delayed_runtime;
unsigned long delay_ms;
spinlock_t pd_event_lock;
u32 pd_events;
struct work_struct event_work;
struct delayed_work state_machine;
struct delayed_work vdm_state_machine;
bool state_machine_running;
struct completion tx_complete;
enum tcpm_transmit_status tx_status;
struct mutex swap_lock; /* swap command lock */
bool swap_pending;
bool non_pd_role_swap;
struct completion swap_complete;
int swap_status;
unsigned int negotiated_rev;
unsigned int message_id;
unsigned int caps_count;
unsigned int hard_reset_count;
bool pd_capable;
bool explicit_contract;
unsigned int rx_msgid;
/* Partner capabilities/requests */
u32 sink_request;
u32 source_caps[PDO_MAX_OBJECTS];
unsigned int nr_source_caps;
u32 sink_caps[PDO_MAX_OBJECTS];
unsigned int nr_sink_caps;
/* Local capabilities */
u32 src_pdo[PDO_MAX_OBJECTS];
unsigned int nr_src_pdo;
u32 snk_pdo[PDO_MAX_OBJECTS];
unsigned int nr_snk_pdo;
u32 snk_vdo[VDO_MAX_OBJECTS];
unsigned int nr_snk_vdo;
unsigned int operating_snk_mw;
bool update_sink_caps;
/* Requested current / voltage */
u32 current_limit;
u32 supply_voltage;
/* Used to export TA voltage and current */
struct power_supply *psy;
struct power_supply_desc psy_desc;
enum power_supply_usb_type usb_type;
u32 bist_request;
/* PD state for Vendor Defined Messages */
enum vdm_states vdm_state;
u32 vdm_retries;
/* next Vendor Defined Message to send */
u32 vdo_data[VDO_MAX_SIZE];
u8 vdo_count;
/* VDO to retry if UFP responder replied busy */
u32 vdo_retry;
/* PPS */
struct pd_pps_data pps_data;
struct completion pps_complete;
bool pps_pending;
int pps_status;
/* Alternate mode data */
struct pd_mode_data mode_data;
struct typec_altmode *partner_altmode[ALTMODE_DISCOVERY_MAX];
struct typec_altmode *port_altmode[ALTMODE_DISCOVERY_MAX];
/* Deadline in jiffies to exit src_try_wait state */
unsigned long max_wait;
/* port belongs to a self powered device */
bool self_powered;
#ifdef CONFIG_DEBUG_FS
struct dentry *dentry;
struct mutex logbuffer_lock; /* log buffer access lock */
int logbuffer_head;
int logbuffer_tail;
u8 *logbuffer[LOG_BUFFER_ENTRIES];
#endif
};
struct pd_rx_event {
struct work_struct work;
struct tcpm_port *port;
struct pd_message msg;
};
#define tcpm_cc_is_sink(cc) \
((cc) == TYPEC_CC_RP_DEF || (cc) == TYPEC_CC_RP_1_5 || \
(cc) == TYPEC_CC_RP_3_0)
#define tcpm_port_is_sink(port) \
((tcpm_cc_is_sink((port)->cc1) && !tcpm_cc_is_sink((port)->cc2)) || \
(tcpm_cc_is_sink((port)->cc2) && !tcpm_cc_is_sink((port)->cc1)))
#define tcpm_cc_is_source(cc) ((cc) == TYPEC_CC_RD)
#define tcpm_cc_is_audio(cc) ((cc) == TYPEC_CC_RA)
#define tcpm_cc_is_open(cc) ((cc) == TYPEC_CC_OPEN)
#define tcpm_port_is_source(port) \
((tcpm_cc_is_source((port)->cc1) && \
!tcpm_cc_is_source((port)->cc2)) || \
(tcpm_cc_is_source((port)->cc2) && \
!tcpm_cc_is_source((port)->cc1)))
#define tcpm_port_is_debug(port) \
(tcpm_cc_is_source((port)->cc1) && tcpm_cc_is_source((port)->cc2))
#define tcpm_port_is_audio(port) \
(tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_audio((port)->cc2))
#define tcpm_port_is_audio_detached(port) \
((tcpm_cc_is_audio((port)->cc1) && tcpm_cc_is_open((port)->cc2)) || \
(tcpm_cc_is_audio((port)->cc2) && tcpm_cc_is_open((port)->cc1)))
#define tcpm_try_snk(port) \
((port)->try_snk_count == 0 && (port)->try_role == TYPEC_SINK && \
(port)->port_type == TYPEC_PORT_DRP)
#define tcpm_try_src(port) \
((port)->try_src_count == 0 && (port)->try_role == TYPEC_SOURCE && \
(port)->port_type == TYPEC_PORT_DRP)
static enum tcpm_state tcpm_default_state(struct tcpm_port *port)
{
if (port->port_type == TYPEC_PORT_DRP) {
if (port->try_role == TYPEC_SINK)
return SNK_UNATTACHED;
else if (port->try_role == TYPEC_SOURCE)
return SRC_UNATTACHED;
/* Fall through to return SRC_UNATTACHED */
} else if (port->port_type == TYPEC_PORT_SNK) {
return SNK_UNATTACHED;
}
return SRC_UNATTACHED;
}
static bool tcpm_port_is_disconnected(struct tcpm_port *port)
{
return (!port->attached && port->cc1 == TYPEC_CC_OPEN &&
port->cc2 == TYPEC_CC_OPEN) ||
(port->attached && ((port->polarity == TYPEC_POLARITY_CC1 &&
port->cc1 == TYPEC_CC_OPEN) ||
(port->polarity == TYPEC_POLARITY_CC2 &&
port->cc2 == TYPEC_CC_OPEN)));
}
/*
* Logging
*/
#ifdef CONFIG_DEBUG_FS
static bool tcpm_log_full(struct tcpm_port *port)
{
return port->logbuffer_tail ==
(port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
}
__printf(2, 0)
static void _tcpm_log(struct tcpm_port *port, const char *fmt, va_list args)
{
char tmpbuffer[LOG_BUFFER_ENTRY_SIZE];
u64 ts_nsec = local_clock();
unsigned long rem_nsec;
mutex_lock(&port->logbuffer_lock);
if (!port->logbuffer[port->logbuffer_head]) {
port->logbuffer[port->logbuffer_head] =
kzalloc(LOG_BUFFER_ENTRY_SIZE, GFP_KERNEL);
if (!port->logbuffer[port->logbuffer_head]) {
mutex_unlock(&port->logbuffer_lock);
return;
}
}
vsnprintf(tmpbuffer, sizeof(tmpbuffer), fmt, args);
if (tcpm_log_full(port)) {
port->logbuffer_head = max(port->logbuffer_head - 1, 0);
strcpy(tmpbuffer, "overflow");
}
if (port->logbuffer_head < 0 ||
port->logbuffer_head >= LOG_BUFFER_ENTRIES) {
dev_warn(port->dev,
"Bad log buffer index %d\n", port->logbuffer_head);
goto abort;
}
if (!port->logbuffer[port->logbuffer_head]) {
dev_warn(port->dev,
"Log buffer index %d is NULL\n", port->logbuffer_head);
goto abort;
}
rem_nsec = do_div(ts_nsec, 1000000000);
scnprintf(port->logbuffer[port->logbuffer_head],
LOG_BUFFER_ENTRY_SIZE, "[%5lu.%06lu] %s",
(unsigned long)ts_nsec, rem_nsec / 1000,
tmpbuffer);
port->logbuffer_head = (port->logbuffer_head + 1) % LOG_BUFFER_ENTRIES;
abort:
mutex_unlock(&port->logbuffer_lock);
}
__printf(2, 3)
static void tcpm_log(struct tcpm_port *port, const char *fmt, ...)
{
va_list args;
/* Do not log while disconnected and unattached */
if (tcpm_port_is_disconnected(port) &&
(port->state == SRC_UNATTACHED || port->state == SNK_UNATTACHED ||
port->state == TOGGLING))
return;
va_start(args, fmt);
_tcpm_log(port, fmt, args);
va_end(args);
}
__printf(2, 3)
static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
_tcpm_log(port, fmt, args);
va_end(args);
}
static void tcpm_log_source_caps(struct tcpm_port *port)
{
int i;
for (i = 0; i < port->nr_source_caps; i++) {
u32 pdo = port->source_caps[i];
enum pd_pdo_type type = pdo_type(pdo);
char msg[64];
switch (type) {
case PDO_TYPE_FIXED:
scnprintf(msg, sizeof(msg),
"%u mV, %u mA [%s%s%s%s%s%s]",
pdo_fixed_voltage(pdo),
pdo_max_current(pdo),
(pdo & PDO_FIXED_DUAL_ROLE) ?
"R" : "",
(pdo & PDO_FIXED_SUSPEND) ?
"S" : "",
(pdo & PDO_FIXED_HIGHER_CAP) ?
"H" : "",
(pdo & PDO_FIXED_USB_COMM) ?
"U" : "",
(pdo & PDO_FIXED_DATA_SWAP) ?
"D" : "",
(pdo & PDO_FIXED_EXTPOWER) ?
"E" : "");
break;
case PDO_TYPE_VAR:
scnprintf(msg, sizeof(msg),
"%u-%u mV, %u mA",
pdo_min_voltage(pdo),
pdo_max_voltage(pdo),
pdo_max_current(pdo));
break;
case PDO_TYPE_BATT:
scnprintf(msg, sizeof(msg),
"%u-%u mV, %u mW",
pdo_min_voltage(pdo),
pdo_max_voltage(pdo),
pdo_max_power(pdo));
break;
case PDO_TYPE_APDO:
if (pdo_apdo_type(pdo) == APDO_TYPE_PPS)
scnprintf(msg, sizeof(msg),
"%u-%u mV, %u mA",
pdo_pps_apdo_min_voltage(pdo),
pdo_pps_apdo_max_voltage(pdo),
pdo_pps_apdo_max_current(pdo));
else
strcpy(msg, "undefined APDO");
break;
default:
strcpy(msg, "undefined");
break;
}
tcpm_log(port, " PDO %d: type %d, %s",
i, type, msg);
}
}
static int tcpm_debug_show(struct seq_file *s, void *v)
{
struct tcpm_port *port = (struct tcpm_port *)s->private;
int tail;
mutex_lock(&port->logbuffer_lock);
tail = port->logbuffer_tail;
while (tail != port->logbuffer_head) {
seq_printf(s, "%s\n", port->logbuffer[tail]);
tail = (tail + 1) % LOG_BUFFER_ENTRIES;
}
if (!seq_has_overflowed(s))
port->logbuffer_tail = tail;
mutex_unlock(&port->logbuffer_lock);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
static void tcpm_debugfs_init(struct tcpm_port *port)
{
char name[NAME_MAX];
mutex_init(&port->logbuffer_lock);
snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
port->dentry = debugfs_create_file(name, S_IFREG | 0444, usb_debug_root,
port, &tcpm_debug_fops);
}
static void tcpm_debugfs_exit(struct tcpm_port *port)
{
int i;
mutex_lock(&port->logbuffer_lock);
for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
kfree(port->logbuffer[i]);
port->logbuffer[i] = NULL;
}
mutex_unlock(&port->logbuffer_lock);
debugfs_remove(port->dentry);
}
#else
__printf(2, 3)
static void tcpm_log(const struct tcpm_port *port, const char *fmt, ...) { }
__printf(2, 3)
static void tcpm_log_force(struct tcpm_port *port, const char *fmt, ...) { }
static void tcpm_log_source_caps(struct tcpm_port *port) { }
static void tcpm_debugfs_init(const struct tcpm_port *port) { }
static void tcpm_debugfs_exit(const struct tcpm_port *port) { }
#endif
static int tcpm_pd_transmit(struct tcpm_port *port,
enum tcpm_transmit_type type,
const struct pd_message *msg)
{
unsigned long timeout;
int ret;
if (msg)
tcpm_log(port, "PD TX, header: %#x", le16_to_cpu(msg->header));
else
tcpm_log(port, "PD TX, type: %#x", type);
reinit_completion(&port->tx_complete);
ret = port->tcpc->pd_transmit(port->tcpc, type, msg);
if (ret < 0)
return ret;
mutex_unlock(&port->lock);
timeout = wait_for_completion_timeout(&port->tx_complete,
msecs_to_jiffies(PD_T_TCPC_TX_TIMEOUT));
mutex_lock(&port->lock);
if (!timeout)
return -ETIMEDOUT;
switch (port->tx_status) {
case TCPC_TX_SUCCESS:
port->message_id = (port->message_id + 1) & PD_HEADER_ID_MASK;
return 0;
case TCPC_TX_DISCARDED:
return -EAGAIN;
case TCPC_TX_FAILED:
default:
return -EIO;
}
}
void tcpm_pd_transmit_complete(struct tcpm_port *port,
enum tcpm_transmit_status status)
{
tcpm_log(port, "PD TX complete, status: %u", status);
port->tx_status = status;
complete(&port->tx_complete);
}
EXPORT_SYMBOL_GPL(tcpm_pd_transmit_complete);
static int tcpm_mux_set(struct tcpm_port *port, int state,
enum usb_role usb_role,
enum typec_orientation orientation)
{
int ret;
tcpm_log(port, "Requesting mux state %d, usb-role %d, orientation %d",
state, usb_role, orientation);
ret = typec_set_orientation(port->typec_port, orientation);
if (ret)
return ret;
if (port->role_sw) {
ret = usb_role_switch_set_role(port->role_sw, usb_role);
if (ret)
return ret;
}
return typec_set_mode(port->typec_port, state);
}
static int tcpm_set_polarity(struct tcpm_port *port,
enum typec_cc_polarity polarity)
{
int ret;
tcpm_log(port, "polarity %d", polarity);
ret = port->tcpc->set_polarity(port->tcpc, polarity);
if (ret < 0)
return ret;
port->polarity = polarity;
return 0;
}
static int tcpm_set_vconn(struct tcpm_port *port, bool enable)
{
int ret;
tcpm_log(port, "vconn:=%d", enable);
ret = port->tcpc->set_vconn(port->tcpc, enable);
if (!ret) {
port->vconn_role = enable ? TYPEC_SOURCE : TYPEC_SINK;
typec_set_vconn_role(port->typec_port, port->vconn_role);
}
return ret;
}
static u32 tcpm_get_current_limit(struct tcpm_port *port)
{
enum typec_cc_status cc;
u32 limit;
cc = port->polarity ? port->cc2 : port->cc1;
switch (cc) {
case TYPEC_CC_RP_1_5:
limit = 1500;
break;
case TYPEC_CC_RP_3_0:
limit = 3000;
break;
case TYPEC_CC_RP_DEF:
default:
if (port->tcpc->get_current_limit)
limit = port->tcpc->get_current_limit(port->tcpc);
else
limit = 0;
break;
}
return limit;
}
static int tcpm_set_current_limit(struct tcpm_port *port, u32 max_ma, u32 mv)
{
int ret = -EOPNOTSUPP;
tcpm_log(port, "Setting voltage/current limit %u mV %u mA", mv, max_ma);
port->supply_voltage = mv;
port->current_limit = max_ma;
if (port->tcpc->set_current_limit)
ret = port->tcpc->set_current_limit(port->tcpc, max_ma, mv);
return ret;
}
/*
* Determine RP value to set based on maximum current supported
* by a port if configured as source.
* Returns CC value to report to link partner.
*/
static enum typec_cc_status tcpm_rp_cc(struct tcpm_port *port)
{
const u32 *src_pdo = port->src_pdo;
int nr_pdo = port->nr_src_pdo;
int i;
/*
* Search for first entry with matching voltage.
* It should report the maximum supported current.
*/
for (i = 0; i < nr_pdo; i++) {
const u32 pdo = src_pdo[i];
if (pdo_type(pdo) == PDO_TYPE_FIXED &&
pdo_fixed_voltage(pdo) == 5000) {
unsigned int curr = pdo_max_current(pdo);
if (curr >= 3000)
return TYPEC_CC_RP_3_0;
else if (curr >= 1500)
return TYPEC_CC_RP_1_5;
return TYPEC_CC_RP_DEF;
}
}
return TYPEC_CC_RP_DEF;
}
static int tcpm_set_attached_state(struct tcpm_port *port, bool attached)
{
return port->tcpc->set_roles(port->tcpc, attached, port->pwr_role,
port->data_role);
}
static int tcpm_set_roles(struct tcpm_port *port, bool attached,
enum typec_role role, enum typec_data_role data)
{
enum typec_orientation orientation;
enum usb_role usb_role;
int ret;
if (port->polarity == TYPEC_POLARITY_CC1)
orientation = TYPEC_ORIENTATION_NORMAL;
else
orientation = TYPEC_ORIENTATION_REVERSE;
if (data == TYPEC_HOST)
usb_role = USB_ROLE_HOST;
else
usb_role = USB_ROLE_DEVICE;
ret = tcpm_mux_set(port, TYPEC_STATE_USB, usb_role, orientation);
if (ret < 0)
return ret;
ret = port->tcpc->set_roles(port->tcpc, attached, role, data);
if (ret < 0)
return ret;
port->pwr_role = role;
port->data_role = data;
typec_set_data_role(port->typec_port, data);
typec_set_pwr_role(port->typec_port, role);
return 0;
}
static int tcpm_set_pwr_role(struct tcpm_port *port, enum typec_role role)
{
int ret;
ret = port->tcpc->set_roles(port->tcpc, true, role,
port->data_role);
if (ret < 0)
return ret;
port->pwr_role = role;
typec_set_pwr_role(port->typec_port, role);
return 0;
}
static int tcpm_pd_send_source_caps(struct tcpm_port *port)
{
struct pd_message msg;
int i;
memset(&msg, 0, sizeof(msg));
if (!port->nr_src_pdo) {
/* No source capabilities defined, sink only */
msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
port->pwr_role,
port->data_role,
port->negotiated_rev,
port->message_id, 0);
} else {
msg.header = PD_HEADER_LE(PD_DATA_SOURCE_CAP,
port->pwr_role,
port->data_role,
port->negotiated_rev,
port->message_id,
port->nr_src_pdo);
}
for (i = 0; i < port->nr_src_pdo; i++)
msg.payload[i] = cpu_to_le32(port->src_pdo[i]);
return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
}
static int tcpm_pd_send_sink_caps(struct tcpm_port *port)
{
struct pd_message msg;
int i;
memset(&msg, 0, sizeof(msg));
if (!port->nr_snk_pdo) {
/* No sink capabilities defined, source only */
msg.header = PD_HEADER_LE(PD_CTRL_REJECT,
port->pwr_role,
port->data_role,
port->negotiated_rev,
port->message_id, 0);
} else {
msg.header = PD_HEADER_LE(PD_DATA_SINK_CAP,
port->pwr_role,
port->data_role,
port->negotiated_rev,
port->message_id,
port->nr_snk_pdo);
}
for (i = 0; i < port->nr_snk_pdo; i++)
msg.payload[i] = cpu_to_le32(port->snk_pdo[i]);
return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
}
static void tcpm_set_state(struct tcpm_port *port, enum tcpm_state state,
unsigned int delay_ms)
{
if (delay_ms) {
tcpm_log(port, "pending state change %s -> %s @ %u ms",
tcpm_states[port->state], tcpm_states[state],
delay_ms);
port->delayed_state = state;
mod_delayed_work(port->wq, &port->state_machine,
msecs_to_jiffies(delay_ms));
port->delayed_runtime = jiffies + msecs_to_jiffies(delay_ms);
port->delay_ms = delay_ms;
} else {
tcpm_log(port, "state change %s -> %s",
tcpm_states[port->state], tcpm_states[state]);
port->delayed_state = INVALID_STATE;
port->prev_state = port->state;
port->state = state;
/*
* Don't re-queue the state machine work item if we're currently
* in the state machine and we're immediately changing states.
* tcpm_state_machine_work() will continue running the state
* machine.
*/
if (!port->state_machine_running)
mod_delayed_work(port->wq, &port->state_machine, 0);
}
}
static void tcpm_set_state_cond(struct tcpm_port *port, enum tcpm_state state,
unsigned int delay_ms)
{
if (port->enter_state == port->state)
tcpm_set_state(port, state, delay_ms);
else
tcpm_log(port,
"skipped %sstate change %s -> %s [%u ms], context state %s",
delay_ms ? "delayed " : "",
tcpm_states[port->state], tcpm_states[state],
delay_ms, tcpm_states[port->enter_state]);
}
static void tcpm_queue_message(struct tcpm_port *port,
enum pd_msg_request message)
{
port->queued_message = message;
mod_delayed_work(port->wq, &port->state_machine, 0);
}
/*
* VDM/VDO handling functions
*/
static void tcpm_queue_vdm(struct tcpm_port *port, const u32 header,
const u32 *data, int cnt)
{
port->vdo_count = cnt + 1;
port->vdo_data[0] = header;
memcpy(&port->vdo_data[1], data, sizeof(u32) * cnt);
/* Set ready, vdm state machine will actually send */
port->vdm_retries = 0;
port->vdm_state = VDM_STATE_READY;
}
static void svdm_consume_identity(struct tcpm_port *port, const __le32 *payload,
int cnt)
{
u32 vdo = le32_to_cpu(payload[VDO_INDEX_IDH]);
u32 product = le32_to_cpu(payload[VDO_INDEX_PRODUCT]);
memset(&port->mode_data, 0, sizeof(port->mode_data));
port->partner_ident.id_header = vdo;
port->partner_ident.cert_stat = le32_to_cpu(payload[VDO_INDEX_CSTAT]);
port->partner_ident.product = product;
typec_partner_set_identity(port->partner);
tcpm_log(port, "Identity: %04x:%04x.%04x",
PD_IDH_VID(vdo),
PD_PRODUCT_PID(product), product & 0xffff);
}
static bool svdm_consume_svids(struct tcpm_port *port, const __le32 *payload,
int cnt)
{
struct pd_mode_data *pmdata = &port->mode_data;
int i;
for (i = 1; i < cnt; i++) {
u32 p = le32_to_cpu(payload[i]);
u16 svid;
svid = (p >> 16) & 0xffff;
if (!svid)
return false;
if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
goto abort;
pmdata->svids[pmdata->nsvids++] = svid;
tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
svid = p & 0xffff;
if (!svid)
return false;
if (pmdata->nsvids >= SVID_DISCOVERY_MAX)
goto abort;
pmdata->svids[pmdata->nsvids++] = svid;
tcpm_log(port, "SVID %d: 0x%x", pmdata->nsvids, svid);
}
return true;
abort:
tcpm_log(port, "SVID_DISCOVERY_MAX(%d) too low!", SVID_DISCOVERY_MAX);
return false;
}
static void svdm_consume_modes(struct tcpm_port *port, const __le32 *payload,
int cnt)
{
struct pd_mode_data *pmdata = &port->mode_data;
struct typec_altmode_desc *paltmode;
int i;
if (pmdata->altmodes >= ARRAY_SIZE(port->partner_altmode)) {
/* Already logged in svdm_consume_svids() */
return;
}
for (i = 1; i < cnt; i++) {
paltmode = &pmdata->altmode_desc[pmdata->altmodes];
memset(paltmode, 0, sizeof(*paltmode));
paltmode->svid = pmdata->svids[pmdata->svid_index];
paltmode->mode = i;
paltmode->vdo = le32_to_cpu(payload[i]);
tcpm_log(port, " Alternate mode %d: SVID 0x%04x, VDO %d: 0x%08x",
pmdata->altmodes, paltmode->svid,
paltmode->mode, paltmode->vdo);
pmdata->altmodes++;
}
}
static void tcpm_register_partner_altmodes(struct tcpm_port *port)
{
struct pd_mode_data *modep = &port->mode_data;
struct typec_altmode *altmode;
int i;
for (i = 0; i < modep->altmodes; i++) {
altmode = typec_partner_register_altmode(port->partner,
&modep->altmode_desc[i]);
if (!altmode)
tcpm_log(port, "Failed to register partner SVID 0x%04x",
modep->altmode_desc[i].svid);
port->partner_altmode[i] = altmode;
}
}
#define supports_modal(port) PD_IDH_MODAL_SUPP((port)->partner_ident.id_header)
static int tcpm_pd_svdm(struct tcpm_port *port, const __le32 *payload, int cnt,
u32 *response)
{
struct typec_altmode *adev;
struct typec_altmode *pdev;
struct pd_mode_data *modep;
u32 p[PD_MAX_PAYLOAD];
int rlen = 0;
int cmd_type;
int cmd;
int i;
for (i = 0; i < cnt; i++)
p[i] = le32_to_cpu(payload[i]);
cmd_type = PD_VDO_CMDT(p[0]);
cmd = PD_VDO_CMD(p[0]);
tcpm_log(port, "Rx VDM cmd 0x%x type %d cmd %d len %d",
p[0], cmd_type, cmd, cnt);
modep = &port->mode_data;
adev = typec_match_altmode(port->port_altmode, ALTMODE_DISCOVERY_MAX,
PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
switch (cmd_type) {
case CMDT_INIT:
switch (cmd) {
case CMD_DISCOVER_IDENT:
/* 6.4.4.3.1: Only respond as UFP (device) */
if (port->data_role == TYPEC_DEVICE &&
port->nr_snk_vdo) {
for (i = 0; i < port->nr_snk_vdo; i++)
response[i + 1] = port->snk_vdo[i];
rlen = port->nr_snk_vdo + 1;
}
break;
case CMD_DISCOVER_SVID:
break;
case CMD_DISCOVER_MODES:
break;
case CMD_ENTER_MODE:
break;
case CMD_EXIT_MODE:
break;
case CMD_ATTENTION:
/* Attention command does not have response */
if (adev)
typec_altmode_attention(adev, p[1]);
return 0;
default:
break;
}
if (rlen >= 1) {
response[0] = p[0] | VDO_CMDT(CMDT_RSP_ACK);
} else if (rlen == 0) {
response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
rlen = 1;
} else {
response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
rlen = 1;
}
break;
case CMDT_RSP_ACK:
/* silently drop message if we are not connected */
if (IS_ERR_OR_NULL(port->partner))
break;
switch (cmd) {
case CMD_DISCOVER_IDENT:
/* 6.4.4.3.1 */
svdm_consume_identity(port, payload, cnt);
response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
rlen = 1;
break;
case CMD_DISCOVER_SVID:
/* 6.4.4.3.2 */
if (svdm_consume_svids(port, payload, cnt)) {
response[0] = VDO(USB_SID_PD, 1,
CMD_DISCOVER_SVID);
rlen = 1;
} else if (modep->nsvids && supports_modal(port)) {
response[0] = VDO(modep->svids[0], 1,
CMD_DISCOVER_MODES);
rlen = 1;
}
break;
case CMD_DISCOVER_MODES:
/* 6.4.4.3.3 */
svdm_consume_modes(port, payload, cnt);
modep->svid_index++;
if (modep->svid_index < modep->nsvids) {
u16 svid = modep->svids[modep->svid_index];
response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
rlen = 1;
} else {
tcpm_register_partner_altmodes(port);
}
break;
case CMD_ENTER_MODE:
if (adev && pdev) {
typec_altmode_update_active(pdev, true);
if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
response[0] = VDO(adev->svid, 1,
CMD_EXIT_MODE);
response[0] |= VDO_OPOS(adev->mode);
return 1;
}
}
return 0;
case CMD_EXIT_MODE:
if (adev && pdev) {
typec_altmode_update_active(pdev, false);
/* Back to USB Operation */
WARN_ON(typec_altmode_notify(adev,
TYPEC_STATE_USB,
NULL));
}
break;
default:
break;
}
break;
case CMDT_RSP_NAK:
switch (cmd) {
case CMD_ENTER_MODE:
/* Back to USB Operation */
if (adev)
WARN_ON(typec_altmode_notify(adev,
TYPEC_STATE_USB,
NULL));
break;
default:
break;
}
break;
default:
break;
}
/* Informing the alternate mode drivers about everything */
if (adev)
typec_altmode_vdm(adev, p[0], &p[1], cnt);
return rlen;
}
static void tcpm_handle_vdm_request(struct tcpm_port *port,
const __le32 *payload, int cnt)
{
int rlen = 0;
u32 response[8] = { };
u32 p0 = le32_to_cpu(payload[0]);
if (port->vdm_state == VDM_STATE_BUSY) {
/* If UFP responded busy retry after timeout */
if (PD_VDO_CMDT(p0) == CMDT_RSP_BUSY) {
port->vdm_state = VDM_STATE_WAIT_RSP_BUSY;
port->vdo_retry = (p0 & ~VDO_CMDT_MASK) |
CMDT_INIT;
mod_delayed_work(port->wq, &port->vdm_state_machine,
msecs_to_jiffies(PD_T_VDM_BUSY));
return;
}
port->vdm_state = VDM_STATE_DONE;
}
if (PD_VDO_SVDM(p0))
rlen = tcpm_pd_svdm(port, payload, cnt, response);
if (rlen > 0) {
tcpm_queue_vdm(port, response[0], &response[1], rlen - 1);
mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
}
}
static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
const u32 *data, int count)
{
u32 header;
if (WARN_ON(count > VDO_MAX_SIZE - 1))
count = VDO_MAX_SIZE - 1;
/* set VDM header with VID & CMD */
header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
tcpm_queue_vdm(port, header, data, count);
mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
}
static unsigned int vdm_ready_timeout(u32 vdm_hdr)
{
unsigned int timeout;
int cmd = PD_VDO_CMD(vdm_hdr);
/* its not a structured VDM command */
if (!PD_VDO_SVDM(vdm_hdr))
return PD_T_VDM_UNSTRUCTURED;
switch (PD_VDO_CMDT(vdm_hdr)) {
case CMDT_INIT:
if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
timeout = PD_T_VDM_WAIT_MODE_E;
else
timeout = PD_T_VDM_SNDR_RSP;
break;
default:
if (cmd == CMD_ENTER_MODE || cmd == CMD_EXIT_MODE)
timeout = PD_T_VDM_E_MODE;
else
timeout = PD_T_VDM_RCVR_RSP;
break;
}
return timeout;
}
static void vdm_run_state_machine(struct tcpm_port *port)
{
struct pd_message msg;
int i, res;
switch (port->vdm_state) {
case VDM_STATE_READY:
/* Only transmit VDM if attached */
if (!port->attached) {
port->vdm_state = VDM_STATE_ERR_BUSY;
break;
}
/*
* if there's traffic or we're not in PDO ready state don't send
* a VDM.
*/
if (port->state != SRC_READY && port->state != SNK_READY)
break;
/* Prepare and send VDM */
memset(&msg, 0, sizeof(msg));
msg.header = PD_HEADER_LE(PD_DATA_VENDOR_DEF,
port->pwr_role,
port->data_role,
port->negotiated_rev,
port->message_id, port->vdo_count);
for (i = 0; i < port->vdo_count; i++)
msg.payload[i] = cpu_to_le32(port->vdo_data[i]);
res = tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
if (res < 0) {
port->vdm_state = VDM_STATE_ERR_SEND;
} else {
unsigned long timeout;
port->vdm_retries = 0;
port->vdm_state = VDM_STATE_BUSY;
timeout = vdm_ready_timeout(port->vdo_data[0]);
mod_delayed_work(port->wq, &port->vdm_state_machine,
timeout);
}
break;
case VDM_STATE_WAIT_RSP_BUSY:
port->vdo_data[0] = port->vdo_retry;
port->vdo_count = 1;
port->vdm_state = VDM_STATE_READY;
break;
case VDM_STATE_BUSY:
port->vdm_state = VDM_STATE_ERR_TMOUT;
break;
case VDM_STATE_ERR_SEND:
/*
* A partner which does not support USB PD will not reply,
* so this is not a fatal error. At the same time, some
* devices may not return GoodCRC under some circumstances,
* so we need to retry.
*/
if (port->vdm_retries < 3) {
tcpm_log(port, "VDM Tx error, retry");
port->vdm_retries++;
port->vdm_state = VDM_STATE_READY;
}
break;
default:
break;
}
}
static void vdm_state_machine_work(struct work_struct *work)
{
struct tcpm_port *port = container_of(work, struct tcpm_port,
vdm_state_machine.work);
enum vdm_states prev_state;
mutex_lock(&port->lock);
/*
* Continue running as long as the port is not busy and there was
* a state change.
*/
do {
prev_state = port->vdm_state;
vdm_run_state_machine(port);
} while (port->vdm_state != prev_state &&
port->vdm_state != VDM_STATE_BUSY);
mutex_unlock(&port->lock);
}
enum pdo_err {
PDO_NO_ERR,
PDO_ERR_NO_VSAFE5V,
PDO_ERR_VSAFE5V_NOT_FIRST,
PDO_ERR_PDO_TYPE_NOT_IN_ORDER,
PDO_ERR_FIXED_NOT_SORTED,
PDO_ERR_VARIABLE_BATT_NOT_SORTED,
PDO_ERR_DUPE_PDO,
PDO_ERR_PPS_APDO_NOT_SORTED,
PDO_ERR_DUPE_PPS_APDO,
};
static const char * const pdo_err_msg[] = {
[PDO_ERR_NO_VSAFE5V] =
" err: source/sink caps should atleast have vSafe5V",
[PDO_ERR_VSAFE5V_NOT_FIRST] =
" err: vSafe5V Fixed Supply Object Shall always be the first object",
[PDO_ERR_PDO_TYPE_NOT_IN_ORDER] =
" err: PDOs should be in the following order: Fixed; Battery; Variable",
[PDO_ERR_FIXED_NOT_SORTED] =
" err: Fixed supply pdos should be in increasing order of their fixed voltage",
[PDO_ERR_VARIABLE_BATT_NOT_SORTED] =
" err: Variable/Battery supply pdos should be in increasing order of their minimum voltage",
[PDO_ERR_DUPE_PDO] =
" err: Variable/Batt supply pdos cannot have same min/max voltage",
[PDO_ERR_PPS_APDO_NOT_SORTED] =
" err: Programmable power supply apdos should be in increasing order of their maximum voltage",
[PDO_ERR_DUPE_PPS_APDO] =
" err: Programmable power supply apdos cannot have same min/max voltage and max current",
};
static enum pdo_err tcpm_caps_err(struct tcpm_port *port, const u32 *pdo,
unsigned int nr_pdo)
{
unsigned int i;
/* Should at least contain vSafe5v */
if (nr_pdo < 1)
return PDO_ERR_NO_VSAFE5V;
/* The vSafe5V Fixed Supply Object Shall always be the first object */
if (pdo_type(pdo[0]) != PDO_TYPE_FIXED ||
pdo_fixed_voltage(pdo[0]) != VSAFE5V)
return PDO_ERR_VSAFE5V_NOT_FIRST;
for (i = 1; i < nr_pdo; i++) {
if (pdo_type(pdo[i]) < pdo_type(pdo[i - 1])) {
return PDO_ERR_PDO_TYPE_NOT_IN_ORDER;
} else if (pdo_type(pdo[i]) == pdo_type(pdo[i - 1])) {
enum pd_pdo_type type = pdo_type(pdo[i]);
switch (type) {
/*
* The remaining Fixed Supply Objects, if
* present, shall be sent in voltage order;
* lowest to highest.
*/
case PDO_TYPE_FIXED:
if (pdo_fixed_voltage(pdo[i]) <=
pdo_fixed_voltage(pdo[i - 1]))
return PDO_ERR_FIXED_NOT_SORTED;
break;
/*
* The Battery Supply Objects and Variable
* supply, if present shall be sent in Minimum
* Voltage order; lowest to highest.
*/
case PDO_TYPE_VAR:
case PDO_TYPE_BATT:
if (pdo_min_voltage(pdo[i]) <
pdo_min_voltage(pdo[i - 1]))
return PDO_ERR_VARIABLE_BATT_NOT_SORTED;
else if ((pdo_min_voltage(pdo[i]) ==
pdo_min_voltage(pdo[i - 1])) &&
(pdo_max_voltage(pdo[i]) ==
pdo_max_voltage(pdo[i - 1])))
return PDO_ERR_DUPE_PDO;
break;
/*
* The Programmable Power Supply APDOs, if present,
* shall be sent in Maximum Voltage order;
* lowest to highest.
*/
case PDO_TYPE_APDO:
if (pdo_apdo_type(pdo[i]) != APDO_TYPE_PPS)
break;
if (pdo_pps_apdo_max_voltage(pdo[i]) <
pdo_pps_apdo_max_voltage(pdo[i - 1]))
return PDO_ERR_PPS_APDO_NOT_SORTED;
else if (pdo_pps_apdo_min_voltage(pdo[i]) ==
pdo_pps_apdo_min_voltage(pdo[i - 1]) &&
pdo_pps_apdo_max_voltage(pdo[i]) ==
pdo_pps_apdo_max_voltage(pdo[i - 1]) &&
pdo_pps_apdo_max_current(pdo[i]) ==
pdo_pps_apdo_max_current(pdo[i - 1]))
return PDO_ERR_DUPE_PPS_APDO;
break;
default:
tcpm_log_force(port, " Unknown pdo type");
}
}
}
return PDO_NO_ERR;
}
static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
unsigned int nr_pdo)
{
enum pdo_err err_index = tcpm_caps_err(port, pdo, nr_pdo);
if (err_index != PDO_NO_ERR) {
tcpm_log_force(port, " %s", pdo_err_msg[err_index]);
return -EINVAL;
}
return 0;
}
static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
{
struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
u32 header;
mutex_lock(&port->lock);
header = VDO(altmode->svid, vdo ? 2 : 1, CMD_ENTER_MODE);
header |= VDO_OPOS(altmode->mode);
tcpm_queue_vdm(port, header, vdo, vdo ? 1 : 0);
mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
mutex_unlock(&port->lock);
return 0;
}
static int tcpm_altmode_exit(struct typec_altmode *altmode)
{
struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
u32 header;
mutex_lock(&port->lock);
header = VDO(altmode->svid, 1, CMD_EXIT_MODE);
header |= VDO_OPOS(altmode->mode);
tcpm_queue_vdm(port, header, NULL, 0);
mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
mutex_unlock(&port->lock);
return 0;
}
static int tcpm_altmode_vdm(struct typec_altmode *altmode,
u32 header, const u32 *data, int count)
{
struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
mutex_lock(&port->lock);
tcpm_queue_vdm(port, header, data, count - 1);
mod_delayed_work(port->wq, &port->vdm_state_machine, 0);
mutex_unlock(&port->lock);
return 0;
}
static const struct typec_altmode_ops tcpm_altmode_ops = {
.enter = tcpm_altmode_enter,
.exit = tcpm_altmode_exit,
.vdm = tcpm_altmode_vdm,
};
/*
* PD (data, control) command handling functions
*/
static inline enum tcpm_state ready_state(struct tcpm_port *port)
{
if (port->pwr_role == TYPEC_SOURCE)
return SRC_READY;
else
return SNK_READY;
}
static int tcpm_pd_send_control(struct tcpm_port *port,
enum pd_ctrl_msg_type type);
static void tcpm_handle_alert(struct tcpm_port *port, const __le32 *payload,
int cnt)
{
u32 p0 = le32_to_cpu(payload[0]);
unsigned int type = usb_pd_ado_type(p0);
if (!type) {
tcpm_log(port, "Alert message received with no type");
return;
}
/* Just handling non-battery alerts for now */
if (!(type & USB_PD_ADO_TYPE_BATT_STATUS_CHANGE)) {
switch (port->state) {
case SRC_READY:
case SNK_READY:
tcpm_set_state(port, GET_STATUS_SEND, 0);
break;
default:
tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
break;
}
}
}
static void tcpm_pd_data_request(struct tcpm_port *port,
const struct pd_message *msg)
{
enum pd_data_msg_type type = pd_header_type_le(msg->header);
unsigned int cnt = pd_header_cnt_le(msg->header);
unsigned int rev = pd_header_rev_le(msg->header);
unsigned int i;
switch (type) {
case PD_DATA_SOURCE_CAP:
if (port->pwr_role != TYPEC_SINK)
break;
for (i = 0; i < cnt; i++)
port->source_caps[i] = le32_to_cpu(msg->payload[i]);
port->nr_source_caps = cnt;
tcpm_log_source_caps(port);
tcpm_validate_caps(port, port->source_caps,
port->nr_source_caps);
/*
* Adjust revision in subsequent message headers, as required,
* to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
* support Rev 1.0 so just do nothing in that scenario.
*/
if (rev == PD_REV10)
break;
if (rev < PD_MAX_REV)
port->negotiated_rev = rev;
/*
* This message may be received even if VBUS is not
* present. This is quite unexpected; see USB PD
* specification, sections 8.3.3.6.3.1 and 8.3.3.6.3.2.
* However, at the same time, we must be ready to
* receive this message and respond to it 15ms after
* receiving PS_RDY during power swap operations, no matter
* if VBUS is available or not (USB PD specification,
* section 6.5.9.2).
* So we need to accept the message either way,
* but be prepared to keep waiting for VBUS after it was
* handled.
*/
tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
break;
case PD_DATA_REQUEST:
if (port->pwr_role != TYPEC_SOURCE ||
cnt != 1) {
tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
break;
}
/*
* Adjust revision in subsequent message headers, as required,
* to comply with 6.2.1.1.5 of the USB PD 3.0 spec. We don't
* support Rev 1.0 so just reject in that scenario.
*/
if (rev == PD_REV10) {
tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
break;
}
if (rev < PD_MAX_REV)
port->negotiated_rev = rev;
port->sink_request = le32_to_cpu(msg->payload[0]);
tcpm_set_state(port, SRC_NEGOTIATE_CAPABILITIES, 0);
break;
case PD_DATA_SINK_CAP:
/* We don't do anything with this at the moment... */
for (i = 0; i < cnt; i++)
port->sink_caps[i] = le32_to_cpu(msg->payload[i]);
port->nr_sink_caps = cnt;
break;
case PD_DATA_VENDOR_DEF:
tcpm_handle_vdm_request(port, msg->payload, cnt);
break;
case PD_DATA_BIST:
if (port->state == SRC_READY || port->state == SNK_READY) {
port->bist_request = le32_to_cpu(msg->payload[0]);
tcpm_set_state(port, BIST_RX, 0);
}
break;
case PD_DATA_ALERT:
tcpm_handle_alert(port, msg->payload, cnt);
break;
case PD_DATA_BATT_STATUS:
case PD_DATA_GET_COUNTRY_INFO:
/* Currently unsupported */
tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
break;
default:
tcpm_log(port, "Unhandled data message type %#x", type);
break;
}
}
static void tcpm_pps_complete(struct tcpm_port *port, int result)
{
if (port->pps_pending) {
port->pps_status = result;
port->pps_pending = false;
complete(&port->pps_complete);
}
}
static void tcpm_pd_ctrl_request(struct tcpm_port *port,
const struct pd_message *msg)
{
enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
enum tcpm_state next_state;
switch (type) {
case PD_CTRL_GOOD_CRC:
case PD_CTRL_PING:
break;
case PD_CTRL_GET_SOURCE_CAP:
switch (port->state) {
case SRC_READY:
case SNK_READY:
tcpm_queue_message(port, PD_MSG_DATA_SOURCE_CAP);
break;
default:
tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
break;
}
break;
case PD_CTRL_GET_SINK_CAP:
switch (port->state) {
case SRC_READY:
case SNK_READY:
tcpm_queue_message(port, PD_MSG_DATA_SINK_CAP);
break;
default:
tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
break;
}
break;
case PD_CTRL_GOTO_MIN:
break;
case PD_CTRL_PS_RDY:
switch (port->state) {
case SNK_TRANSITION_SINK:
if (port->vbus_present) {
tcpm_set_current_limit(port,
port->current_limit,
port->supply_voltage);
port->explicit_contract = true;
tcpm_set_state(port, SNK_READY, 0);
} else {
/*
* Seen after power swap. Keep waiting for VBUS
* in a transitional state.
*/
tcpm_set_state(port,
SNK_TRANSITION_SINK_VBUS, 0);
}
break;
case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
tcpm_set_state(port, PR_SWAP_SRC_SNK_SINK_ON, 0);
break;
case PR_SWAP_SNK_SRC_SINK_OFF:
tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON, 0);
break;
case VCONN_SWAP_WAIT_FOR_VCONN:
tcpm_set_state(port, VCONN_SWAP_TURN_OFF_VCONN, 0);
break;
default:
break;
}
break;
case PD_CTRL_REJECT:
case PD_CTRL_WAIT:
case PD_CTRL_NOT_SUPP:
switch (port->state) {
case SNK_NEGOTIATE_CAPABILITIES:
/* USB PD specification, Figure 8-43 */
if (port->explicit_contract)
next_state = SNK_READY;
else
next_state = SNK_WAIT_CAPABILITIES;
tcpm_set_state(port, next_state, 0);
break;
case SNK_NEGOTIATE_PPS_CAPABILITIES:
/* Revert data back from any requested PPS updates */
port->pps_data.out_volt = port->supply_voltage;
port->pps_data.op_curr = port->current_limit;
port->pps_status = (type == PD_CTRL_WAIT ?
-EAGAIN : -EOPNOTSUPP);
tcpm_set_state(port, SNK_READY, 0);
break;
case DR_SWAP_SEND:
port->swap_status = (type == PD_CTRL_WAIT ?
-EAGAIN : -EOPNOTSUPP);
tcpm_set_state(port, DR_SWAP_CANCEL, 0);
break;
case PR_SWAP_SEND:
port->swap_status = (type == PD_CTRL_WAIT ?
-EAGAIN : -EOPNOTSUPP);
tcpm_set_state(port, PR_SWAP_CANCEL, 0);
break;
case VCONN_SWAP_SEND:
port->swap_status = (type == PD_CTRL_WAIT ?
-EAGAIN : -EOPNOTSUPP);
tcpm_set_state(port, VCONN_SWAP_CANCEL, 0);
break;
default:
break;
}
break;
case PD_CTRL_ACCEPT:
switch (port->state) {
case SNK_NEGOTIATE_CAPABILITIES:
port->pps_data.active = false;
tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
break;
case SNK_NEGOTIATE_PPS_CAPABILITIES:
port->pps_data.active = true;
port->supply_voltage = port->pps_data.out_volt;
port->current_limit = port->pps_data.op_curr;
tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
break;
case SOFT_RESET_SEND:
port->message_id = 0;
port->rx_msgid = -1;
if (port->pwr_role == TYPEC_SOURCE)
next_state = SRC_SEND_CAPABILITIES;
else
next_state = SNK_WAIT_CAPABILITIES;
tcpm_set_state(port, next_state, 0);
break;
case DR_SWAP_SEND:
tcpm_set_state(port, DR_SWAP_CHANGE_DR, 0);
break;
case PR_SWAP_SEND:
tcpm_set_state(port, PR_SWAP_START, 0);
break;
case VCONN_SWAP_SEND:
tcpm_set_state(port, VCONN_SWAP_START, 0);
break;
default:
break;
}
break;
case PD_CTRL_SOFT_RESET:
tcpm_set_state(port, SOFT_RESET, 0);
break;
case PD_CTRL_DR_SWAP:
if (port->port_type != TYPEC_PORT_DRP) {
tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
break;
}
/*
* XXX
* 6.3.9: If an alternate mode is active, a request to swap
* alternate modes shall trigger a port reset.
*/
switch (port->state) {
case SRC_READY:
case SNK_READY:
tcpm_set_state(port, DR_SWAP_ACCEPT, 0);
break;
default:
tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
break;
}
break;
case PD_CTRL_PR_SWAP:
if (port->port_type != TYPEC_PORT_DRP) {
tcpm_queue_message(port, PD_MSG_CTRL_REJECT);
break;
}
switch (port->state) {
case SRC_READY:
case SNK_READY:
tcpm_set_state(port, PR_SWAP_ACCEPT, 0);
break;
default:
tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
break;
}
break;
case PD_CTRL_VCONN_SWAP:
switch (port->state) {
case SRC_READY:
case SNK_READY:
tcpm_set_state(port, VCONN_SWAP_ACCEPT, 0);
break;
default:
tcpm_queue_message(port, PD_MSG_CTRL_WAIT);
break;
}
break;
case PD_CTRL_GET_SOURCE_CAP_EXT:
case PD_CTRL_GET_STATUS:
case PD_CTRL_FR_SWAP:
case PD_CTRL_GET_PPS_STATUS:
case PD_CTRL_GET_COUNTRY_CODES:
/* Currently not supported */
tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
break;
default:
tcpm_log(port, "Unhandled ctrl message type %#x", type);
break;
}
}
static void tcpm_pd_ext_msg_request(struct tcpm_port *port,
const struct pd_message *msg)
{
enum pd_ext_msg_type type = pd_header_type_le(msg->header);
unsigned int data_size = pd_ext_header_data_size_le(msg->ext_msg.header);
if (!(msg->ext_msg.header & PD_EXT_HDR_CHUNKED)) {
tcpm_log(port, "Unchunked extended messages unsupported");
return;
}
if (data_size > PD_EXT_MAX_CHUNK_DATA) {
tcpm_log(port, "Chunk handling not yet supported");
return;
}
switch (type) {
case PD_EXT_STATUS:
/*
* If PPS related events raised then get PPS status to clear
* (see USB PD 3.0 Spec, 6.5.2.4)
*/
if (msg->ext_msg.data[USB_PD_EXT_SDB_EVENT_FLAGS] &
USB_PD_EXT_SDB_PPS_EVENTS)
tcpm_set_state(port, GET_PPS_STATUS_SEND, 0);
else
tcpm_set_state(port, ready_state(port), 0);
break;
case PD_EXT_PPS_STATUS:
/*
* For now the PPS status message is used to clear events
* and nothing more.
*/
tcpm_set_state(port, ready_state(port), 0);
break;
case PD_EXT_SOURCE_CAP_EXT:
case PD_EXT_GET_BATT_CAP:
case PD_EXT_GET_BATT_STATUS:
case PD_EXT_BATT_CAP:
case PD_EXT_GET_MANUFACTURER_INFO:
case PD_EXT_MANUFACTURER_INFO:
case PD_EXT_SECURITY_REQUEST:
case PD_EXT_SECURITY_RESPONSE:
case PD_EXT_FW_UPDATE_REQUEST:
case PD_EXT_FW_UPDATE_RESPONSE:
case PD_EXT_COUNTRY_INFO:
case PD_EXT_COUNTRY_CODES:
tcpm_queue_message(port, PD_MSG_CTRL_NOT_SUPP);
break;
default:
tcpm_log(port, "Unhandled extended message type %#x", type);
break;
}
}
static void tcpm_pd_rx_handler(struct work_struct *work)
{
struct pd_rx_event *event = container_of(work,
struct pd_rx_event, work);
const struct pd_message *msg = &event->msg;
unsigned int cnt = pd_header_cnt_le(msg->header);
struct tcpm_port *port = event->port;
mutex_lock(&port->lock);
tcpm_log(port, "PD RX, header: %#x [%d]", le16_to_cpu(msg->header),
port->attached);
if (port->attached) {
enum pd_ctrl_msg_type type = pd_header_type_le(msg->header);
unsigned int msgid = pd_header_msgid_le(msg->header);
/*
* USB PD standard, 6.6.1.2:
* "... if MessageID value in a received Message is the
* same as the stored value, the receiver shall return a
* GoodCRC Message with that MessageID value and drop
* the Message (this is a retry of an already received
* Message). Note: this shall not apply to the Soft_Reset
* Message which always has a MessageID value of zero."
*/
if (msgid == port->rx_msgid && type != PD_CTRL_SOFT_RESET)
goto done;
port->rx_msgid = msgid;
/*
* If both ends believe to be DFP/host, we have a data role
* mismatch.
*/
if (!!(le16_to_cpu(msg->header) & PD_HEADER_DATA_ROLE) ==
(port->data_role == TYPEC_HOST)) {
tcpm_log(port,
"Data role mismatch, initiating error recovery");
tcpm_set_state(port, ERROR_RECOVERY, 0);
} else {
if (msg->header & PD_HEADER_EXT_HDR)
tcpm_pd_ext_msg_request(port, msg);
else if (cnt)
tcpm_pd_data_request(port, msg);
else
tcpm_pd_ctrl_request(port, msg);
}
}
done:
mutex_unlock(&port->lock);
kfree(event);
}
void tcpm_pd_receive(struct tcpm_port *port, const struct pd_message *msg)
{
struct pd_rx_event *event;
event = kzalloc(sizeof(*event), GFP_ATOMIC);
if (!event)
return;
INIT_WORK(&event->work, tcpm_pd_rx_handler);
event->port = port;
memcpy(&event->msg, msg, sizeof(*msg));
queue_work(port->wq, &event->work);
}
EXPORT_SYMBOL_GPL(tcpm_pd_receive);
static int tcpm_pd_send_control(struct tcpm_port *port,
enum pd_ctrl_msg_type type)
{
struct pd_message msg;
memset(&msg, 0, sizeof(msg));
msg.header = PD_HEADER_LE(type, port->pwr_role,
port->data_role,
port->negotiated_rev,
port->message_id, 0);
return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
}
/*
* Send queued message without affecting state.
* Return true if state machine should go back to sleep,
* false otherwise.
*/
static bool tcpm_send_queued_message(struct tcpm_port *port)
{
enum pd_msg_request queued_message;
do {
queued_message = port->queued_message;
port->queued_message = PD_MSG_NONE;
switch (queued_message) {
case PD_MSG_CTRL_WAIT:
tcpm_pd_send_control(port, PD_CTRL_WAIT);
break;
case PD_MSG_CTRL_REJECT:
tcpm_pd_send_control(port, PD_CTRL_REJECT);
break;
case PD_MSG_CTRL_NOT_SUPP:
tcpm_pd_send_control(port, PD_CTRL_NOT_SUPP);
break;
case PD_MSG_DATA_SINK_CAP:
tcpm_pd_send_sink_caps(port);
break;
case PD_MSG_DATA_SOURCE_CAP:
tcpm_pd_send_source_caps(port);
break;
default:
break;
}
} while (port->queued_message != PD_MSG_NONE);
if (port->delayed_state != INVALID_STATE) {
if (time_is_after_jiffies(port->delayed_runtime)) {
mod_delayed_work(port->wq, &port->state_machine,
port->delayed_runtime - jiffies);
return true;
}
port->delayed_state = INVALID_STATE;
}
return false;
}
static int tcpm_pd_check_request(struct tcpm_port *port)
{
u32 pdo, rdo = port->sink_request;
unsigned int max, op, pdo_max, index;
enum pd_pdo_type type;
index = rdo_index(rdo);
if (!index || index > port->nr_src_pdo)
return -EINVAL;
pdo = port->src_pdo[index - 1];
type = pdo_type(pdo);
switch (type) {
case PDO_TYPE_FIXED:
case PDO_TYPE_VAR:
max = rdo_max_current(rdo);
op = rdo_op_current(rdo);
pdo_max = pdo_max_current(pdo);
if (op > pdo_max)
return -EINVAL;
if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
return -EINVAL;
if (type == PDO_TYPE_FIXED)
tcpm_log(port,
"Requested %u mV, %u mA for %u / %u mA",
pdo_fixed_voltage(pdo), pdo_max, op, max);
else
tcpm_log(port,
"Requested %u -> %u mV, %u mA for %u / %u mA",
pdo_min_voltage(pdo), pdo_max_voltage(pdo),
pdo_max, op, max);
break;
case PDO_TYPE_BATT:
max = rdo_max_power(rdo);
op = rdo_op_power(rdo);
pdo_max = pdo_max_power(pdo);
if (op > pdo_max)
return -EINVAL;
if (max > pdo_max && !(rdo & RDO_CAP_MISMATCH))
return -EINVAL;
tcpm_log(port,
"Requested %u -> %u mV, %u mW for %u / %u mW",
pdo_min_voltage(pdo), pdo_max_voltage(pdo),
pdo_max, op, max);
break;
default:
return -EINVAL;
}
port->op_vsafe5v = index == 1;
return 0;
}
#define min_power(x, y) min(pdo_max_power(x), pdo_max_power(y))
#define min_current(x, y) min(pdo_max_current(x), pdo_max_current(y))
static int tcpm_pd_select_pdo(struct tcpm_port *port, int *sink_pdo,
int *src_pdo)
{
unsigned int i, j, max_src_mv = 0, min_src_mv = 0, max_mw = 0,
max_mv = 0, src_mw = 0, src_ma = 0, max_snk_mv = 0,
min_snk_mv = 0;
int ret = -EINVAL;
port->pps_data.supported = false;
port->usb_type = POWER_SUPPLY_USB_TYPE_PD;
/*
* Select the source PDO providing the most power which has a
* matchig sink cap.
*/
for (i = 0; i < port->nr_source_caps; i++) {
u32 pdo = port->source_caps[i];
enum pd_pdo_type type = pdo_type(pdo);
switch (type) {
case PDO_TYPE_FIXED:
max_src_mv = pdo_fixed_voltage(pdo);
min_src_mv = max_src_mv;
break;
case PDO_TYPE_BATT:
case PDO_TYPE_VAR:
max_src_mv = pdo_max_voltage(pdo);
min_src_mv = pdo_min_voltage(pdo);
break;
case PDO_TYPE_APDO:
if (pdo_apdo_type(pdo) == APDO_TYPE_PPS) {
port->pps_data.supported = true;
port->usb_type =
POWER_SUPPLY_USB_TYPE_PD_PPS;
}
continue;
default:
tcpm_log(port, "Invalid source PDO type, ignoring");
continue;
}
switch (type) {
case PDO_TYPE_FIXED:
case PDO_TYPE_VAR:
src_ma = pdo_max_current(pdo);
src_mw = src_ma * min_src_mv / 1000;
break;
case PDO_TYPE_BATT:
src_mw = pdo_max_power(pdo);
break;
case PDO_TYPE_APDO:
continue;
default:
tcpm_log(port, "Invalid source PDO type, ignoring");
continue;
}
for (j = 0; j < port->nr_snk_pdo; j++) {
pdo = port->snk_pdo[j];
switch (pdo_type(pdo)) {
case PDO_TYPE_FIXED:
max_snk_mv = pdo_fixed_voltage(pdo);
min_snk_mv = max_snk_mv;
break;
case PDO_TYPE_BATT:
case PDO_TYPE_VAR:
max_snk_mv = pdo_max_voltage(pdo);
min_snk_mv = pdo_min_voltage(pdo);
break;
case PDO_TYPE_APDO:
continue;
default:
tcpm_log(port, "Invalid sink PDO type, ignoring");
continue;
}
if (max_src_mv <= max_snk_mv &&
min_src_mv >= min_snk_mv) {
/* Prefer higher voltages if available */
if ((src_mw == max_mw && min_src_mv > max_mv) ||
src_mw > max_mw) {
*src_pdo = i;
*sink_pdo = j;
max_mw = src_mw;
max_mv = min_src_mv;
ret = 0;
}
}
}
}
return ret;
}
#define min_pps_apdo_current(x, y) \
min(pdo_pps_apdo_max_current(x), pdo_pps_apdo_max_current(y))
static unsigned int tcpm_pd_select_pps_apdo(struct tcpm_port *port)
{
unsigned int i, j, max_mw = 0, max_mv = 0;
unsigned int min_src_mv, max_src_mv, src_ma, src_mw;
unsigned int min_snk_mv, max_snk_mv;
unsigned int max_op_mv;
u32 pdo, src, snk;
unsigned int src_pdo = 0, snk_pdo = 0;
/*
* Select the source PPS APDO providing the most power while staying
* within the board's limits. We skip the first PDO as this is always
* 5V 3A.
*/
for (i = 1; i < port->nr_source_caps; ++i) {
pdo = port->source_caps[i];
switch (pdo_type(pdo)) {
case PDO_TYPE_APDO:
if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
tcpm_log(port, "Not PPS APDO (source), ignoring");
continue;
}
min_src_mv = pdo_pps_apdo_min_voltage(pdo);
max_src_mv = pdo_pps_apdo_max_voltage(pdo);
src_ma = pdo_pps_apdo_max_current(pdo);
src_mw = (src_ma * max_src_mv) / 1000;
/*
* Now search through the sink PDOs to find a matching
* PPS APDO. Again skip the first sink PDO as this will
* always be 5V 3A.
*/
for (j = 1; j < port->nr_snk_pdo; j++) {
pdo = port->snk_pdo[j];
switch (pdo_type(pdo)) {
case PDO_TYPE_APDO:
if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
tcpm_log(port,
"Not PPS APDO (sink), ignoring");
continue;
}
min_snk_mv =
pdo_pps_apdo_min_voltage(pdo);
max_snk_mv =
pdo_pps_apdo_max_voltage(pdo);
break;
default:
tcpm_log(port,
"Not APDO type (sink), ignoring");
continue;
}
if (min_src_mv <= max_snk_mv &&
max_src_mv >= min_snk_mv) {
max_op_mv = min(max_src_mv, max_snk_mv);
src_mw = (max_op_mv * src_ma) / 1000;
/* Prefer higher voltages if available */
if ((src_mw == max_mw &&
max_op_mv > max_mv) ||
src_mw > max_mw) {
src_pdo = i;
snk_pdo = j;
max_mw = src_mw;
max_mv = max_op_mv;
}
}
}
break;
default:
tcpm_log(port, "Not APDO type (source), ignoring");
continue;
}
}
if (src_pdo) {
src = port->source_caps[src_pdo];
snk = port->snk_pdo[snk_pdo];
port->pps_data.min_volt = max(pdo_pps_apdo_min_voltage(src),
pdo_pps_apdo_min_voltage(snk));
port->pps_data.max_volt = min(pdo_pps_apdo_max_voltage(src),
pdo_pps_apdo_max_voltage(snk));
port->pps_data.max_curr = min_pps_apdo_current(src, snk);
port->pps_data.out_volt = min(port->pps_data.max_volt,
max(port->pps_data.min_volt,
port->pps_data.out_volt));
port->pps_data.op_curr = min(port->pps_data.max_curr,
port->pps_data.op_curr);
}
return src_pdo;
}
static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
{
unsigned int mv, ma, mw, flags;
unsigned int max_ma, max_mw;
enum pd_pdo_type type;
u32 pdo, matching_snk_pdo;
int src_pdo_index = 0;
int snk_pdo_index = 0;
int ret;
ret = tcpm_pd_select_pdo(port, &snk_pdo_index, &src_pdo_index);
if (ret < 0)
return ret;
pdo = port->source_caps[src_pdo_index];
matching_snk_pdo = port->snk_pdo[snk_pdo_index];
type = pdo_type(pdo);
switch (type) {
case PDO_TYPE_FIXED:
mv = pdo_fixed_voltage(pdo);
break;
case PDO_TYPE_BATT:
case PDO_TYPE_VAR:
mv = pdo_min_voltage(pdo);
break;
default:
tcpm_log(port, "Invalid PDO selected!");
return -EINVAL;
}
/* Select maximum available current within the sink pdo's limit */
if (type == PDO_TYPE_BATT) {
mw = min_power(pdo, matching_snk_pdo);
ma = 1000 * mw / mv;
} else {
ma = min_current(pdo, matching_snk_pdo);
mw = ma * mv / 1000;
}
flags = RDO_USB_COMM | RDO_NO_SUSPEND;
/* Set mismatch bit if offered power is less than operating power */
max_ma = ma;
max_mw = mw;
if (mw < port->operating_snk_mw) {
flags |= RDO_CAP_MISMATCH;
if (type == PDO_TYPE_BATT &&
(pdo_max_power(matching_snk_pdo) > pdo_max_power(pdo)))
max_mw = pdo_max_power(matching_snk_pdo);
else if (pdo_max_current(matching_snk_pdo) >
pdo_max_current(pdo))
max_ma = pdo_max_current(matching_snk_pdo);
}
tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
port->cc_req, port->cc1, port->cc2, port->vbus_source,
port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
port->polarity);
if (type == PDO_TYPE_BATT) {
*rdo = RDO_BATT(src_pdo_index + 1, mw, max_mw, flags);
tcpm_log(port, "Requesting PDO %d: %u mV, %u mW%s",
src_pdo_index, mv, mw,
flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
} else {
*rdo = RDO_FIXED(src_pdo_index + 1, ma, max_ma, flags);
tcpm_log(port, "Requesting PDO %d: %u mV, %u mA%s",
src_pdo_index, mv, ma,
flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
}
port->current_limit = ma;
port->supply_voltage = mv;
return 0;
}
static int tcpm_pd_send_request(struct tcpm_port *port)
{
struct pd_message msg;
int ret;
u32 rdo;
ret = tcpm_pd_build_request(port, &rdo);
if (ret < 0)
return ret;
memset(&msg, 0, sizeof(msg));
msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
port->pwr_role,
port->data_role,
port->negotiated_rev,
port->message_id, 1);
msg.payload[0] = cpu_to_le32(rdo);
return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
}
static int tcpm_pd_build_pps_request(struct tcpm_port *port, u32 *rdo)
{
unsigned int out_mv, op_ma, op_mw, max_mv, max_ma, flags;
enum pd_pdo_type type;
unsigned int src_pdo_index;
u32 pdo;
src_pdo_index = tcpm_pd_select_pps_apdo(port);
if (!src_pdo_index)
return -EOPNOTSUPP;
pdo = port->source_caps[src_pdo_index];
type = pdo_type(pdo);
switch (type) {
case PDO_TYPE_APDO:
if (pdo_apdo_type(pdo) != APDO_TYPE_PPS) {
tcpm_log(port, "Invalid APDO selected!");
return -EINVAL;
}
max_mv = port->pps_data.max_volt;
max_ma = port->pps_data.max_curr;
out_mv = port->pps_data.out_volt;
op_ma = port->pps_data.op_curr;
break;
default:
tcpm_log(port, "Invalid PDO selected!");
return -EINVAL;
}
flags = RDO_USB_COMM | RDO_NO_SUSPEND;
op_mw = (op_ma * out_mv) / 1000;
if (op_mw < port->operating_snk_mw) {
/*
* Try raising current to meet power needs. If that's not enough
* then try upping the voltage. If that's still not enough
* then we've obviously chosen a PPS APDO which really isn't
* suitable so abandon ship.
*/
op_ma = (port->operating_snk_mw * 1000) / out_mv;
if ((port->operating_snk_mw * 1000) % out_mv)
++op_ma;
op_ma += RDO_PROG_CURR_MA_STEP - (op_ma % RDO_PROG_CURR_MA_STEP);
if (op_ma > max_ma) {
op_ma = max_ma;
out_mv = (port->operating_snk_mw * 1000) / op_ma;
if ((port->operating_snk_mw * 1000) % op_ma)
++out_mv;
out_mv += RDO_PROG_VOLT_MV_STEP -
(out_mv % RDO_PROG_VOLT_MV_STEP);
if (out_mv > max_mv) {
tcpm_log(port, "Invalid PPS APDO selected!");
return -EINVAL;
}
}
}
tcpm_log(port, "cc=%d cc1=%d cc2=%d vbus=%d vconn=%s polarity=%d",
port->cc_req, port->cc1, port->cc2, port->vbus_source,
port->vconn_role == TYPEC_SOURCE ? "source" : "sink",
port->polarity);
*rdo = RDO_PROG(src_pdo_index + 1, out_mv, op_ma, flags);
tcpm_log(port, "Requesting APDO %d: %u mV, %u mA",
src_pdo_index, out_mv, op_ma);
port->pps_data.op_curr = op_ma;
port->pps_data.out_volt = out_mv;
return 0;
}
static int tcpm_pd_send_pps_request(struct tcpm_port *port)
{
struct pd_message msg;
int ret;
u32 rdo;
ret = tcpm_pd_build_pps_request(port, &rdo);
if (ret < 0)
return ret;
memset(&msg, 0, sizeof(msg));
msg.header = PD_HEADER_LE(PD_DATA_REQUEST,
port->pwr_role,
port->data_role,
port->negotiated_rev,
port->message_id, 1);
msg.payload[0] = cpu_to_le32(rdo);
return tcpm_pd_transmit(port, TCPC_TX_SOP, &msg);
}
static int tcpm_set_vbus(struct tcpm_port *port, bool enable)
{
int ret;
if (enable && port->vbus_charge)
return -EINVAL;
tcpm_log(port, "vbus:=%d charge=%d", enable, port->vbus_charge);
ret = port->tcpc->set_vbus(port->tcpc, enable, port->vbus_charge);
if (ret < 0)
return ret;
port->vbus_source = enable;
return 0;
}
static int tcpm_set_charge(struct tcpm_port *port, bool charge)
{
int ret;
if (charge && port->vbus_source)
return -EINVAL;
if (charge != port->vbus_charge) {
tcpm_log(port, "vbus=%d charge:=%d", port->vbus_source, charge);
ret = port->tcpc->set_vbus(port->tcpc, port->vbus_source,
charge);
if (ret < 0)
return ret;
}
port->vbus_charge = charge;
return 0;
}
static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status cc)
{
int ret;
if (!port->tcpc->start_toggling)
return false;
tcpm_log_force(port, "Start toggling");
ret = port->tcpc->start_toggling(port->tcpc, port->port_type, cc);
return ret == 0;
}
static void tcpm_set_cc(struct tcpm_port *port, enum typec_cc_status cc)
{
tcpm_log(port, "cc:=%d", cc);
port->cc_req = cc;
port->tcpc->set_cc(port->tcpc, cc);
}
static int tcpm_init_vbus(struct tcpm_port *port)
{
int ret;
ret = port->tcpc->set_vbus(port->tcpc, false, false);
port->vbus_source = false;
port->vbus_charge = false;
return ret;
}
static int tcpm_init_vconn(struct tcpm_port *port)
{
int ret;
ret = port->tcpc->set_vconn(port->tcpc, false);
port->vconn_role = TYPEC_SINK;
return ret;
}
static void tcpm_typec_connect(struct tcpm_port *port)
{
if (!port->connected) {
/* Make sure we don't report stale identity information */
memset(&port->partner_ident, 0, sizeof(port->partner_ident));
port->partner_desc.usb_pd = port->pd_capable;
if (tcpm_port_is_debug(port))
port->partner_desc.accessory = TYPEC_ACCESSORY_DEBUG;
else if (tcpm_port_is_audio(port))
port->partner_desc.accessory = TYPEC_ACCESSORY_AUDIO;
else
port->partner_desc.accessory = TYPEC_ACCESSORY_NONE;
port->partner = typec_register_partner(port->typec_port,
&port->partner_desc);
port->connected = true;
}
}
static int tcpm_src_attach(struct tcpm_port *port)
{
enum typec_cc_polarity polarity =
port->cc2 == TYPEC_CC_RD ? TYPEC_POLARITY_CC2
: TYPEC_POLARITY_CC1;
int ret;
if (port->attached)
return 0;
ret = tcpm_set_polarity(port, polarity);
if (ret < 0)
return ret;
ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
if (ret < 0)
return ret;
ret = port->tcpc->set_pd_rx(port->tcpc, true);
if (ret < 0)
goto out_disable_mux;
/*
* USB Type-C specification, version 1.2,
* chapter 4.5.2.2.8.1 (Attached.SRC Requirements)
* Enable VCONN only if the non-RD port is set to RA.
*/
if ((polarity == TYPEC_POLARITY_CC1 && port->cc2 == TYPEC_CC_RA) ||
(polarity == TYPEC_POLARITY_CC2 && port->cc1 == TYPEC_CC_RA)) {
ret = tcpm_set_vconn(port, true);
if (ret < 0)
goto out_disable_pd;
}
ret = tcpm_set_vbus(port, true);
if (ret < 0)
goto out_disable_vconn;
port->pd_capable = false;
port->partner = NULL;
port->attached = true;
port->send_discover = true;
return 0;
out_disable_vconn:
tcpm_set_vconn(port, false);
out_disable_pd:
port->tcpc->set_pd_rx(port->tcpc, false);
out_disable_mux:
tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
TYPEC_ORIENTATION_NONE);
return ret;
}
static void tcpm_typec_disconnect(struct tcpm_port *port)
{
if (port->connected) {
typec_unregister_partner(port->partner);
port->partner = NULL;
port->connected = false;
}
}
static void tcpm_unregister_altmodes(struct tcpm_port *port)
{
struct pd_mode_data *modep = &port->mode_data;
int i;
for (i = 0; i < modep->altmodes; i++) {
typec_unregister_altmode(port->partner_altmode[i]);
port->partner_altmode[i] = NULL;
}
memset(modep, 0, sizeof(*modep));
}
static void tcpm_reset_port(struct tcpm_port *port)
{
tcpm_unregister_altmodes(port);
tcpm_typec_disconnect(port);
port->attached = false;
port->pd_capable = false;
port->pps_data.supported = false;
/*
* First Rx ID should be 0; set this to a sentinel of -1 so that
* we can check tcpm_pd_rx_handler() if we had seen it before.
*/
port->rx_msgid = -1;
port->tcpc->set_pd_rx(port->tcpc, false);
tcpm_init_vbus(port); /* also disables charging */
tcpm_init_vconn(port);
tcpm_set_current_limit(port, 0, 0);
tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
tcpm_mux_set(port, TYPEC_STATE_SAFE, USB_ROLE_NONE,
TYPEC_ORIENTATION_NONE);
tcpm_set_attached_state(port, false);
port->try_src_count = 0;
port->try_snk_count = 0;
port->usb_type = POWER_SUPPLY_USB_TYPE_C;
power_supply_changed(port->psy);
}
static void tcpm_detach(struct tcpm_port *port)
{
if (!port->attached)
return;
if (tcpm_port_is_disconnected(port))
port->hard_reset_count = 0;
tcpm_reset_port(port);
}
static void tcpm_src_detach(struct tcpm_port *port)
{
tcpm_detach(port);
}
static int tcpm_snk_attach(struct tcpm_port *port)
{
int ret;
if (port->attached)
return 0;
ret = tcpm_set_polarity(port, port->cc2 != TYPEC_CC_OPEN ?
TYPEC_POLARITY_CC2 : TYPEC_POLARITY_CC1);
if (ret < 0)
return ret;
ret = tcpm_set_roles(port, true, TYPEC_SINK, TYPEC_DEVICE);
if (ret < 0)
return ret;
port->pd_capable = false;
port->partner = NULL;
port->attached = true;
port->send_discover = true;
return 0;
}
static void tcpm_snk_detach(struct tcpm_port *port)
{
tcpm_detach(port);
}
static int tcpm_acc_attach(struct tcpm_port *port)
{
int ret;
if (port->attached)
return 0;
ret = tcpm_set_roles(port, true, TYPEC_SOURCE, TYPEC_HOST);
if (ret < 0)
return ret;
port->partner = NULL;
tcpm_typec_connect(port);
port->attached = true;
return 0;
}
static void tcpm_acc_detach(struct tcpm_port *port)
{
tcpm_detach(port);
}
static inline enum tcpm_state hard_reset_state(struct tcpm_port *port)
{
if (port->hard_reset_count < PD_N_HARD_RESET_COUNT)
return HARD_RESET_SEND;
if (port->pd_capable)
return ERROR_RECOVERY;
if (port->pwr_role == TYPEC_SOURCE)
return SRC_UNATTACHED;
if (port->state == SNK_WAIT_CAPABILITIES)
return SNK_READY;
return SNK_UNATTACHED;
}
static inline enum tcpm_state unattached_state(struct tcpm_port *port)
{
if (port->port_type == TYPEC_PORT_DRP) {
if (port->pwr_role == TYPEC_SOURCE)
return SRC_UNATTACHED;
else
return SNK_UNATTACHED;
} else if (port->port_type == TYPEC_PORT_SRC) {
return SRC_UNATTACHED;
}
return SNK_UNATTACHED;
}
static void tcpm_check_send_discover(struct tcpm_port *port)
{
if (port->data_role == TYPEC_HOST && port->send_discover &&
port->pd_capable) {
tcpm_send_vdm(port, USB_SID_PD, CMD_DISCOVER_IDENT, NULL, 0);
port->send_discover = false;
}
}
static void tcpm_swap_complete(struct tcpm_port *port, int result)
{
if (port->swap_pending) {
port->swap_status = result;
port->swap_pending = false;
port->non_pd_role_swap = false;
complete(&port->swap_complete);
}
}
static enum typec_pwr_opmode tcpm_get_pwr_opmode(enum typec_cc_status cc)
{
switch (cc) {
case TYPEC_CC_RP_1_5:
return TYPEC_PWR_MODE_1_5A;
case TYPEC_CC_RP_3_0:
return TYPEC_PWR_MODE_3_0A;
case TYPEC_CC_RP_DEF:
default:
return TYPEC_PWR_MODE_USB;
}
}
static void run_state_machine(struct tcpm_port *port)
{
int ret;
enum typec_pwr_opmode opmode;
unsigned int msecs;
port->enter_state = port->state;
switch (port->state) {
case TOGGLING:
break;
/* SRC states */
case SRC_UNATTACHED:
if (!port->non_pd_role_swap)
tcpm_swap_complete(port, -ENOTCONN);
tcpm_src_detach(port);
if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
tcpm_set_state(port, TOGGLING, 0);
break;
}
tcpm_set_cc(port, tcpm_rp_cc(port));
if (port->port_type == TYPEC_PORT_DRP)
tcpm_set_state(port, SNK_UNATTACHED, PD_T_DRP_SNK);
break;
case SRC_ATTACH_WAIT:
if (tcpm_port_is_debug(port))
tcpm_set_state(port, DEBUG_ACC_ATTACHED,
PD_T_CC_DEBOUNCE);
else if (tcpm_port_is_audio(port))
tcpm_set_state(port, AUDIO_ACC_ATTACHED,
PD_T_CC_DEBOUNCE);
else if (tcpm_port_is_source(port))
tcpm_set_state(port,
tcpm_try_snk(port) ? SNK_TRY
: SRC_ATTACHED,
PD_T_CC_DEBOUNCE);
break;
case SNK_TRY:
port->try_snk_count++;
/*
* Requirements:
* - Do not drive vconn or vbus
* - Terminate CC pins (both) to Rd
* Action:
* - Wait for tDRPTry (PD_T_DRP_TRY).
* Until then, ignore any state changes.
*/
tcpm_set_cc(port, TYPEC_CC_RD);
tcpm_set_state(port, SNK_TRY_WAIT, PD_T_DRP_TRY);
break;
case SNK_TRY_WAIT:
if (tcpm_port_is_sink(port)) {
tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE, 0);
} else {
tcpm_set_state(port, SRC_TRYWAIT, 0);
port->max_wait = 0;
}
break;
case SNK_TRY_WAIT_DEBOUNCE:
tcpm_set_state(port, SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS,
PD_T_PD_DEBOUNCE);
break;
case SNK_TRY_WAIT_DEBOUNCE_CHECK_VBUS:
if (port->vbus_present && tcpm_port_is_sink(port)) {
tcpm_set_state(port, SNK_ATTACHED, 0);
} else {
tcpm_set_state(port, SRC_TRYWAIT, 0);
port->max_wait = 0;
}
break;
case SRC_TRYWAIT:
tcpm_set_cc(port, tcpm_rp_cc(port));
if (port->max_wait == 0) {
port->max_wait = jiffies +
msecs_to_jiffies(PD_T_DRP_TRY);
tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
PD_T_DRP_TRY);
} else {
if (time_is_after_jiffies(port->max_wait))
tcpm_set_state(port, SRC_TRYWAIT_UNATTACHED,
jiffies_to_msecs(port->max_wait -
jiffies));
else
tcpm_set_state(port, SNK_UNATTACHED, 0);
}
break;
case SRC_TRYWAIT_DEBOUNCE:
tcpm_set_state(port, SRC_ATTACHED, PD_T_CC_DEBOUNCE);
break;
case SRC_TRYWAIT_UNATTACHED:
tcpm_set_state(port, SNK_UNATTACHED, 0);
break;
case SRC_ATTACHED:
ret = tcpm_src_attach(port);
tcpm_set_state(port, SRC_UNATTACHED,
ret < 0 ? 0 : PD_T_PS_SOURCE_ON);
break;
case SRC_STARTUP:
opmode = tcpm_get_pwr_opmode(tcpm_rp_cc(port));
typec_set_pwr_opmode(port->typec_port, opmode);
port->pwr_opmode = TYPEC_PWR_MODE_USB;
port->caps_count = 0;
port->negotiated_rev = PD_MAX_REV;
port->message_id = 0;
port->rx_msgid = -1;
port->explicit_contract = false;
tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
break;
case SRC_SEND_CAPABILITIES:
port->caps_count++;
if (port->caps_count > PD_N_CAPS_COUNT) {
tcpm_set_state(port, SRC_READY, 0);
break;
}
ret = tcpm_pd_send_source_caps(port);
if (ret < 0) {
tcpm_set_state(port, SRC_SEND_CAPABILITIES,
PD_T_SEND_SOURCE_CAP);
} else {
/*
* Per standard, we should clear the reset counter here.
* However, that can result in state machine hang-ups.
* Reset it only in READY state to improve stability.
*/
/* port->hard_reset_count = 0; */
port->caps_count = 0;
port->pd_capable = true;
tcpm_set_state_cond(port, SRC_SEND_CAPABILITIES_TIMEOUT,
PD_T_SEND_SOURCE_CAP);
}
break;
case SRC_SEND_CAPABILITIES_TIMEOUT:
/*
* Error recovery for a PD_DATA_SOURCE_CAP reply timeout.
*
* PD 2.0 sinks are supposed to accept src-capabilities with a
* 3.0 header and simply ignore any src PDOs which the sink does
* not understand such as PPS but some 2.0 sinks instead ignore
* the entire PD_DATA_SOURCE_CAP message, causing contract
* negotiation to fail.
*
* After PD_N_HARD_RESET_COUNT hard-reset attempts, we try
* sending src-capabilities with a lower PD revision to
* make these broken sinks work.
*/
if (port->hard_reset_count < PD_N_HARD_RESET_COUNT) {
tcpm_set_state(port, HARD_RESET_SEND, 0);
} else if (port->negotiated_rev > PD_REV20) {
port->negotiated_rev--;
port->hard_reset_count = 0;
tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
} else {
tcpm_set_state(port, hard_reset_state(port), 0);
}
break;
case SRC_NEGOTIATE_CAPABILITIES:
ret = tcpm_pd_check_request(port);
if (ret < 0) {
tcpm_pd_send_control(port, PD_CTRL_REJECT);
if (!port->explicit_contract) {
tcpm_set_state(port,
SRC_WAIT_NEW_CAPABILITIES, 0);
} else {
tcpm_set_state(port, SRC_READY, 0);
}
} else {
tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
tcpm_set_state(port, SRC_TRANSITION_SUPPLY,
PD_T_SRC_TRANSITION);
}
break;
case SRC_TRANSITION_SUPPLY:
/* XXX: regulator_set_voltage(vbus, ...) */
tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
port->explicit_contract = true;
typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
port->pwr_opmode = TYPEC_PWR_MODE_PD;
tcpm_set_state_cond(port, SRC_READY, 0);
break;
case SRC_READY:
#if 1
port->hard_reset_count = 0;
#endif
port->try_src_count = 0;
tcpm_swap_complete(port, 0);
tcpm_typec_connect(port);
tcpm_check_send_discover(port);
/*
* 6.3.5
* Sending ping messages is not necessary if
* - the source operates at vSafe5V
* or
* - The system is not operating in PD mode
* or
* - Both partners are connected using a Type-C connector
*
* There is no actual need to send PD messages since the local
* port type-c and the spec does not clearly say whether PD is
* possible when type-c is connected to Type-A/B
*/
break;
case SRC_WAIT_NEW_CAPABILITIES:
/* Nothing to do... */
break;
/* SNK states */
case SNK_UNATTACHED:
if (!port->non_pd_role_swap)
tcpm_swap_complete(port, -ENOTCONN);
tcpm_pps_complete(port, -ENOTCONN);
tcpm_snk_detach(port);
if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
tcpm_set_state(port, TOGGLING, 0);
break;
}
tcpm_set_cc(port, TYPEC_CC_RD);
if (port->port_type == TYPEC_PORT_DRP)
tcpm_set_state(port, SRC_UNATTACHED, PD_T_DRP_SRC);
break;
case SNK_ATTACH_WAIT:
if ((port->cc1 == TYPEC_CC_OPEN &&
port->cc2 != TYPEC_CC_OPEN) ||
(port->cc1 != TYPEC_CC_OPEN &&
port->cc2 == TYPEC_CC_OPEN))
tcpm_set_state(port, SNK_DEBOUNCED,
PD_T_CC_DEBOUNCE);
else if (tcpm_port_is_disconnected(port))
tcpm_set_state(port, SNK_UNATTACHED,
PD_T_PD_DEBOUNCE);
break;
case SNK_DEBOUNCED:
if (tcpm_port_is_disconnected(port))
tcpm_set_state(port, SNK_UNATTACHED,
PD_T_PD_DEBOUNCE);
else if (port->vbus_present)
tcpm_set_state(port,
tcpm_try_src(port) ? SRC_TRY
: SNK_ATTACHED,
0);
else
/* Wait for VBUS, but not forever */
tcpm_set_state(port, PORT_RESET, PD_T_PS_SOURCE_ON);
break;
case SRC_TRY:
port->try_src_count++;
tcpm_set_cc(port, tcpm_rp_cc(port));
port->max_wait = 0;
tcpm_set_state(port, SRC_TRY_WAIT, 0);
break;
case SRC_TRY_WAIT:
if (port->max_wait == 0) {
port->max_wait = jiffies +
msecs_to_jiffies(PD_T_DRP_TRY);
msecs = PD_T_DRP_TRY;
} else {
if (time_is_after_jiffies(port->max_wait))
msecs = jiffies_to_msecs(port->max_wait -
jiffies);
else
msecs = 0;
}
tcpm_set_state(port, SNK_TRYWAIT, msecs);
break;
case SRC_TRY_DEBOUNCE:
tcpm_set_state(port, SRC_ATTACHED, PD_T_PD_DEBOUNCE);
break;
case SNK_TRYWAIT:
tcpm_set_cc(port, TYPEC_CC_RD);
tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE);
break;
case SNK_TRYWAIT_VBUS:
/*
* TCPM stays in this state indefinitely until VBUS
* is detected as long as Rp is not detected for
* more than a time period of tPDDebounce.
*/
if (port->vbus_present && tcpm_port_is_sink(port)) {
tcpm_set_state(port, SNK_ATTACHED, 0);
break;
}
if (!tcpm_port_is_sink(port))
tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
break;
case SNK_TRYWAIT_DEBOUNCE:
tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE);
break;
case SNK_ATTACHED:
ret = tcpm_snk_attach(port);
if (ret < 0)
tcpm_set_state(port, SNK_UNATTACHED, 0);
else
tcpm_set_state(port, SNK_STARTUP, 0);
break;
case SNK_STARTUP:
opmode = tcpm_get_pwr_opmode(port->polarity ?
port->cc2 : port->cc1);
typec_set_pwr_opmode(port->typec_port, opmode);
port->pwr_opmode = TYPEC_PWR_MODE_USB;
port->negotiated_rev = PD_MAX_REV;
port->message_id = 0;
port->rx_msgid = -1;
port->explicit_contract = false;
tcpm_set_state(port, SNK_DISCOVERY, 0);
break;
case SNK_DISCOVERY:
if (port->vbus_present) {
tcpm_set_current_limit(port,
tcpm_get_current_limit(port),
5000);
tcpm_set_charge(port, true);
tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
break;
}
/*
* For DRP, timeouts differ. Also, handling is supposed to be
* different and much more complex (dead battery detection;
* see USB power delivery specification, section 8.3.3.6.1.5.1).
*/
tcpm_set_state(port, hard_reset_state(port),
port->port_type == TYPEC_PORT_DRP ?
PD_T_DB_DETECT : PD_T_NO_RESPONSE);
break;
case SNK_DISCOVERY_DEBOUNCE:
tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE_DONE,
PD_T_CC_DEBOUNCE);
break;
case SNK_DISCOVERY_DEBOUNCE_DONE:
if (!tcpm_port_is_disconnected(port) &&
tcpm_port_is_sink(port) &&
time_is_after_jiffies(port->delayed_runtime)) {
tcpm_set_state(port, SNK_DISCOVERY,
jiffies_to_msecs(port->delayed_runtime -
jiffies));
break;
}
tcpm_set_state(port, unattached_state(port), 0);
break;
case SNK_WAIT_CAPABILITIES:
ret = port->tcpc->set_pd_rx(port->tcpc, true);
if (ret < 0) {
tcpm_set_state(port, SNK_READY, 0);
break;
}
/*
* If VBUS has never been low, and we time out waiting
* for source cap, try a soft reset first, in case we
* were already in a stable contract before this boot.
* Do this only once.
*/
if (port->vbus_never_low) {
port->vbus_never_low = false;
tcpm_set_state(port, SOFT_RESET_SEND,
PD_T_SINK_WAIT_CAP);
} else {
tcpm_set_state(port, hard_reset_state(port),
PD_T_SINK_WAIT_CAP);
}
break;
case SNK_NEGOTIATE_CAPABILITIES:
port->pd_capable = true;
port->hard_reset_count = 0;
ret = tcpm_pd_send_request(port);
if (ret < 0) {
/* Let the Source send capabilities again. */
tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
} else {
tcpm_set_state_cond(port, hard_reset_state(port),
PD_T_SENDER_RESPONSE);
}
break;
case SNK_NEGOTIATE_PPS_CAPABILITIES:
ret = tcpm_pd_send_pps_request(port);
if (ret < 0) {
port->pps_status = ret;
/*
* If this was called due to updates to sink
* capabilities, and pps is no longer valid, we should
* safely fall back to a standard PDO.
*/
if (port->update_sink_caps)
tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
else
tcpm_set_state(port, SNK_READY, 0);
} else {
tcpm_set_state_cond(port, hard_reset_state(port),
PD_T_SENDER_RESPONSE);
}
break;
case SNK_TRANSITION_SINK:
case SNK_TRANSITION_SINK_VBUS:
tcpm_set_state(port, hard_reset_state(port),
PD_T_PS_TRANSITION);
break;
case SNK_READY:
port->try_snk_count = 0;
port->update_sink_caps = false;
if (port->explicit_contract) {
typec_set_pwr_opmode(port->typec_port,
TYPEC_PWR_MODE_PD);
port->pwr_opmode = TYPEC_PWR_MODE_PD;
}
tcpm_swap_complete(port, 0);
tcpm_typec_connect(port);
tcpm_check_send_discover(port);
tcpm_pps_complete(port, port->pps_status);
power_supply_changed(port->psy);
break;
/* Accessory states */
case ACC_UNATTACHED:
tcpm_acc_detach(port);
tcpm_set_state(port, SRC_UNATTACHED, 0);
break;
case DEBUG_ACC_ATTACHED:
case AUDIO_ACC_ATTACHED:
ret = tcpm_acc_attach(port);
if (ret < 0)
tcpm_set_state(port, ACC_UNATTACHED, 0);
break;
case AUDIO_ACC_DEBOUNCE:
tcpm_set_state(port, ACC_UNATTACHED, PD_T_CC_DEBOUNCE);
break;
/* Hard_Reset states */
case HARD_RESET_SEND:
tcpm_pd_transmit(port, TCPC_TX_HARD_RESET, NULL);
tcpm_set_state(port, HARD_RESET_START, 0);
break;
case HARD_RESET_START:
port->hard_reset_count++;
port->tcpc->set_pd_rx(port->tcpc, false);
tcpm_unregister_altmodes(port);
port->send_discover = true;
if (port->pwr_role == TYPEC_SOURCE)
tcpm_set_state(port, SRC_HARD_RESET_VBUS_OFF,
PD_T_PS_HARD_RESET);
else
tcpm_set_state(port, SNK_HARD_RESET_SINK_OFF, 0);
break;
case SRC_HARD_RESET_VBUS_OFF:
tcpm_set_vconn(port, true);
tcpm_set_vbus(port, false);
tcpm_set_roles(port, port->self_powered, TYPEC_SOURCE,
TYPEC_HOST);
tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, PD_T_SRC_RECOVER);
break;
case SRC_HARD_RESET_VBUS_ON:
tcpm_set_vbus(port, true);
port->tcpc->set_pd_rx(port->tcpc, true);
tcpm_set_attached_state(port, true);
tcpm_set_state(port, SRC_UNATTACHED, PD_T_PS_SOURCE_ON);
break;
case SNK_HARD_RESET_SINK_OFF:
memset(&port->pps_data, 0, sizeof(port->pps_data));
tcpm_set_vconn(port, false);
if (port->pd_capable)
tcpm_set_charge(port, false);
tcpm_set_roles(port, port->self_powered, TYPEC_SINK,
TYPEC_DEVICE);
/*
* VBUS may or may not toggle, depending on the adapter.
* If it doesn't toggle, transition to SNK_HARD_RESET_SINK_ON
* directly after timeout.
*/
tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, PD_T_SAFE_0V);
break;
case SNK_HARD_RESET_WAIT_VBUS:
/* Assume we're disconnected if VBUS doesn't come back. */
tcpm_set_state(port, SNK_UNATTACHED,
PD_T_SRC_RECOVER_MAX + PD_T_SRC_TURN_ON);
break;
case SNK_HARD_RESET_SINK_ON:
/* Note: There is no guarantee that VBUS is on in this state */
/*
* XXX:
* The specification suggests that dual mode ports in sink
* mode should transition to state PE_SRC_Transition_to_default.
* See USB power delivery specification chapter 8.3.3.6.1.3.
* This would mean to to
* - turn off VCONN, reset power supply
* - request hardware reset
* - turn on VCONN
* - Transition to state PE_Src_Startup
* SNK only ports shall transition to state Snk_Startup
* (see chapter 8.3.3.3.8).
* Similar, dual-mode ports in source mode should transition
* to PE_SNK_Transition_to_default.
*/
if (port->pd_capable) {
tcpm_set_current_limit(port,
tcpm_get_current_limit(port),
5000);
tcpm_set_charge(port, true);
}
tcpm_set_attached_state(port, true);
tcpm_set_state(port, SNK_STARTUP, 0);
break;
/* Soft_Reset states */
case SOFT_RESET:
port->message_id = 0;
port->rx_msgid = -1;
tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
if (port->pwr_role == TYPEC_SOURCE)
tcpm_set_state(port, SRC_SEND_CAPABILITIES, 0);
else
tcpm_set_state(port, SNK_WAIT_CAPABILITIES, 0);
break;
case SOFT_RESET_SEND:
port->message_id = 0;
port->rx_msgid = -1;
if (tcpm_pd_send_control(port, PD_CTRL_SOFT_RESET))
tcpm_set_state_cond(port, hard_reset_state(port), 0);
else
tcpm_set_state_cond(port, hard_reset_state(port),
PD_T_SENDER_RESPONSE);
break;
/* DR_Swap states */
case DR_SWAP_SEND:
tcpm_pd_send_control(port, PD_CTRL_DR_SWAP);
tcpm_set_state_cond(port, DR_SWAP_SEND_TIMEOUT,
PD_T_SENDER_RESPONSE);
break;
case DR_SWAP_ACCEPT:
tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
tcpm_set_state_cond(port, DR_SWAP_CHANGE_DR, 0);
break;
case DR_SWAP_SEND_TIMEOUT:
tcpm_swap_complete(port, -ETIMEDOUT);
tcpm_set_state(port, ready_state(port), 0);
break;
case DR_SWAP_CHANGE_DR:
if (port->data_role == TYPEC_HOST) {
tcpm_unregister_altmodes(port);
tcpm_set_roles(port, true, port->pwr_role,
TYPEC_DEVICE);
} else {
tcpm_set_roles(port, true, port->pwr_role,
TYPEC_HOST);
port->send_discover = true;
}
tcpm_set_state(port, ready_state(port), 0);
break;
/* PR_Swap states */
case PR_SWAP_ACCEPT:
tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
tcpm_set_state(port, PR_SWAP_START, 0);
break;
case PR_SWAP_SEND:
tcpm_pd_send_control(port, PD_CTRL_PR_SWAP);
tcpm_set_state_cond(port, PR_SWAP_SEND_TIMEOUT,
PD_T_SENDER_RESPONSE);
break;
case PR_SWAP_SEND_TIMEOUT:
tcpm_swap_complete(port, -ETIMEDOUT);
tcpm_set_state(port, ready_state(port), 0);
break;
case PR_SWAP_START:
if (port->pwr_role == TYPEC_SOURCE)
tcpm_set_state(port, PR_SWAP_SRC_SNK_TRANSITION_OFF,
PD_T_SRC_TRANSITION);
else
tcpm_set_state(port, PR_SWAP_SNK_SRC_SINK_OFF, 0);
break;
case PR_SWAP_SRC_SNK_TRANSITION_OFF:
tcpm_set_vbus(port, false);
port->explicit_contract = false;
/* allow time for Vbus discharge, must be < tSrcSwapStdby */
tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF,
PD_T_SRCSWAPSTDBY);
break;
case PR_SWAP_SRC_SNK_SOURCE_OFF:
tcpm_set_cc(port, TYPEC_CC_RD);
/* allow CC debounce */
tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED,
PD_T_CC_DEBOUNCE);
break;
case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
/*
* USB-PD standard, 6.2.1.4, Port Power Role:
* "During the Power Role Swap Sequence, for the initial Source
* Port, the Port Power Role field shall be set to Sink in the
* PS_RDY Message indicating that the initial Source’s power
* supply is turned off"
*/
tcpm_set_pwr_role(port, TYPEC_SINK);
if (tcpm_pd_send_control(port, PD_CTRL_PS_RDY)) {
tcpm_set_state(port, ERROR_RECOVERY, 0);
break;
}
tcpm_set_state_cond(port, SNK_UNATTACHED, PD_T_PS_SOURCE_ON);
break;
case PR_SWAP_SRC_SNK_SINK_ON:
tcpm_set_state(port, SNK_STARTUP, 0);
break;
case PR_SWAP_SNK_SRC_SINK_OFF:
tcpm_set_charge(port, false);
tcpm_set_state(port, hard_reset_state(port),
PD_T_PS_SOURCE_OFF);
break;
case PR_SWAP_SNK_SRC_SOURCE_ON:
tcpm_set_cc(port, tcpm_rp_cc(port));
tcpm_set_vbus(port, true);
/*
* allow time VBUS ramp-up, must be < tNewSrc
* Also, this window overlaps with CC debounce as well.
* So, Wait for the max of two which is PD_T_NEWSRC
*/
tcpm_set_state(port, PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP,
PD_T_NEWSRC);
break;
case PR_SWAP_SNK_SRC_SOURCE_ON_VBUS_RAMPED_UP:
/*
* USB PD standard, 6.2.1.4:
* "Subsequent Messages initiated by the Policy Engine,
* such as the PS_RDY Message sent to indicate that Vbus
* is ready, will have the Port Power Role field set to
* Source."
*/
tcpm_set_pwr_role(port, TYPEC_SOURCE);
tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
tcpm_set_state(port, SRC_STARTUP, 0);
break;
case VCONN_SWAP_ACCEPT:
tcpm_pd_send_control(port, PD_CTRL_ACCEPT);
tcpm_set_state(port, VCONN_SWAP_START, 0);
break;
case VCONN_SWAP_SEND:
tcpm_pd_send_control(port, PD_CTRL_VCONN_SWAP);
tcpm_set_state(port, VCONN_SWAP_SEND_TIMEOUT,
PD_T_SENDER_RESPONSE);
break;
case VCONN_SWAP_SEND_TIMEOUT:
tcpm_swap_complete(port, -ETIMEDOUT);
tcpm_set_state(port, ready_state(port), 0);
break;
case VCONN_SWAP_START:
if (port->vconn_role == TYPEC_SOURCE)
tcpm_set_state(port, VCONN_SWAP_WAIT_FOR_VCONN, 0);
else
tcpm_set_state(port, VCONN_SWAP_TURN_ON_VCONN, 0);
break;
case VCONN_SWAP_WAIT_FOR_VCONN:
tcpm_set_state(port, hard_reset_state(port),
PD_T_VCONN_SOURCE_ON);
break;
case VCONN_SWAP_TURN_ON_VCONN:
tcpm_set_vconn(port, true);
tcpm_pd_send_control(port, PD_CTRL_PS_RDY);
tcpm_set_state(port, ready_state(port), 0);
break;
case VCONN_SWAP_TURN_OFF_VCONN:
tcpm_set_vconn(port, false);
tcpm_set_state(port, ready_state(port), 0);
break;
case DR_SWAP_CANCEL:
case PR_SWAP_CANCEL:
case VCONN_SWAP_CANCEL:
tcpm_swap_complete(port, port->swap_status);
if (port->pwr_role == TYPEC_SOURCE)
tcpm_set_state(port, SRC_READY, 0);
else
tcpm_set_state(port, SNK_READY, 0);
break;
case BIST_RX:
switch (BDO_MODE_MASK(port->bist_request)) {
case BDO_MODE_CARRIER2:
tcpm_pd_transmit(port, TCPC_TX_BIST_MODE_2, NULL);
break;
default:
break;
}
/* Always switch to unattached state */
tcpm_set_state(port, unattached_state(port), 0);
break;
case GET_STATUS_SEND:
tcpm_pd_send_control(port, PD_CTRL_GET_STATUS);
tcpm_set_state(port, GET_STATUS_SEND_TIMEOUT,
PD_T_SENDER_RESPONSE);
break;
case GET_STATUS_SEND_TIMEOUT:
tcpm_set_state(port, ready_state(port), 0);
break;
case GET_PPS_STATUS_SEND:
tcpm_pd_send_control(port, PD_CTRL_GET_PPS_STATUS);
tcpm_set_state(port, GET_PPS_STATUS_SEND_TIMEOUT,
PD_T_SENDER_RESPONSE);
break;
case GET_PPS_STATUS_SEND_TIMEOUT:
tcpm_set_state(port, ready_state(port), 0);
break;
case ERROR_RECOVERY:
tcpm_swap_complete(port, -EPROTO);
tcpm_pps_complete(port, -EPROTO);
tcpm_set_state(port, PORT_RESET, 0);
break;
case PORT_RESET:
tcpm_reset_port(port);
tcpm_set_cc(port, TYPEC_CC_OPEN);
tcpm_set_state(port, PORT_RESET_WAIT_OFF,
PD_T_ERROR_RECOVERY);
break;
case PORT_RESET_WAIT_OFF:
tcpm_set_state(port,
tcpm_default_state(port),
port->vbus_present ? PD_T_PS_SOURCE_OFF : 0);
break;
default:
WARN(1, "Unexpected port state %d\n", port->state);
break;
}
}
static void tcpm_state_machine_work(struct work_struct *work)
{
struct tcpm_port *port = container_of(work, struct tcpm_port,
state_machine.work);
enum tcpm_state prev_state;
mutex_lock(&port->lock);
port->state_machine_running = true;
if (port->queued_message && tcpm_send_queued_message(port))
goto done;
/* If we were queued due to a delayed state change, update it now */
if (port->delayed_state) {
tcpm_log(port, "state change %s -> %s [delayed %ld ms]",
tcpm_states[port->state],
tcpm_states[port->delayed_state], port->delay_ms);
port->prev_state = port->state;
port->state = port->delayed_state;
port->delayed_state = INVALID_STATE;
}
/*
* Continue running as long as we have (non-delayed) state changes
* to make.
*/
do {
prev_state = port->state;
run_state_machine(port);
if (port->queued_message)
tcpm_send_queued_message(port);
} while (port->state != prev_state && !port->delayed_state);
done:
port->state_machine_running = false;
mutex_unlock(&port->lock);
}
static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
enum typec_cc_status cc2)
{
enum typec_cc_status old_cc1, old_cc2;
enum tcpm_state new_state;
old_cc1 = port->cc1;
old_cc2 = port->cc2;
port->cc1 = cc1;
port->cc2 = cc2;
tcpm_log_force(port,
"CC1: %u -> %u, CC2: %u -> %u [state %s, polarity %d, %s]",
old_cc1, cc1, old_cc2, cc2, tcpm_states[port->state],
port->polarity,
tcpm_port_is_disconnected(port) ? "disconnected"
: "connected");
switch (port->state) {
case TOGGLING:
if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
tcpm_port_is_source(port))
tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
else if (tcpm_port_is_sink(port))
tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
break;
case SRC_UNATTACHED:
case ACC_UNATTACHED:
if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) ||
tcpm_port_is_source(port))
tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
break;
case SRC_ATTACH_WAIT:
if (tcpm_port_is_disconnected(port) ||
tcpm_port_is_audio_detached(port))
tcpm_set_state(port, SRC_UNATTACHED, 0);
else if (cc1 != old_cc1 || cc2 != old_cc2)
tcpm_set_state(port, SRC_ATTACH_WAIT, 0);
break;
case SRC_ATTACHED:
case SRC_SEND_CAPABILITIES:
case SRC_READY:
if (tcpm_port_is_disconnected(port) ||
!tcpm_port_is_source(port))
tcpm_set_state(port, SRC_UNATTACHED, 0);
break;
case SNK_UNATTACHED:
if (tcpm_port_is_sink(port))
tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
break;
case SNK_ATTACH_WAIT:
if ((port->cc1 == TYPEC_CC_OPEN &&
port->cc2 != TYPEC_CC_OPEN) ||
(port->cc1 != TYPEC_CC_OPEN &&
port->cc2 == TYPEC_CC_OPEN))
new_state = SNK_DEBOUNCED;
else if (tcpm_port_is_disconnected(port))
new_state = SNK_UNATTACHED;
else
break;
if (new_state != port->delayed_state)
tcpm_set_state(port, SNK_ATTACH_WAIT, 0);
break;
case SNK_DEBOUNCED:
if (tcpm_port_is_disconnected(port))
new_state = SNK_UNATTACHED;
else if (port->vbus_present)
new_state = tcpm_try_src(port) ? SRC_TRY : SNK_ATTACHED;
else
new_state = SNK_UNATTACHED;
if (new_state != port->delayed_state)
tcpm_set_state(port, SNK_DEBOUNCED, 0);
break;
case SNK_READY:
if (tcpm_port_is_disconnected(port))
tcpm_set_state(port, unattached_state(port), 0);
else if (!port->pd_capable &&
(cc1 != old_cc1 || cc2 != old_cc2))
tcpm_set_current_limit(port,
tcpm_get_current_limit(port),
5000);
break;
case AUDIO_ACC_ATTACHED:
if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
tcpm_set_state(port, AUDIO_ACC_DEBOUNCE, 0);
break;
case AUDIO_ACC_DEBOUNCE:
if (tcpm_port_is_audio(port))
tcpm_set_state(port, AUDIO_ACC_ATTACHED, 0);
break;
case DEBUG_ACC_ATTACHED:
if (cc1 == TYPEC_CC_OPEN || cc2 == TYPEC_CC_OPEN)
tcpm_set_state(port, ACC_UNATTACHED, 0);
break;
case SNK_TRY:
/* Do nothing, waiting for timeout */
break;
case SNK_DISCOVERY:
/* CC line is unstable, wait for debounce */
if (tcpm_port_is_disconnected(port))
tcpm_set_state(port, SNK_DISCOVERY_DEBOUNCE, 0);
break;
case SNK_DISCOVERY_DEBOUNCE:
break;
case SRC_TRYWAIT:
/* Hand over to state machine if needed */
if (!port->vbus_present && tcpm_port_is_source(port))
tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
break;
case SRC_TRYWAIT_DEBOUNCE:
if (port->vbus_present || !tcpm_port_is_source(port))
tcpm_set_state(port, SRC_TRYWAIT, 0);
break;
case SNK_TRY_WAIT_DEBOUNCE:
if (!tcpm_port_is_sink(port)) {
port->max_wait = 0;
tcpm_set_state(port, SRC_TRYWAIT, 0);
}
break;
case SRC_TRY_WAIT:
if (tcpm_port_is_source(port))
tcpm_set_state(port, SRC_TRY_DEBOUNCE, 0);
break;
case SRC_TRY_DEBOUNCE:
tcpm_set_state(port, SRC_TRY_WAIT, 0);
break;
case SNK_TRYWAIT_DEBOUNCE:
if (tcpm_port_is_sink(port))
tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0);
break;
case SNK_TRYWAIT_VBUS:
if (!tcpm_port_is_sink(port))
tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0);
break;
case SNK_TRYWAIT:
/* Do nothing, waiting for tCCDebounce */
break;
case PR_SWAP_SNK_SRC_SINK_OFF:
case PR_SWAP_SRC_SNK_TRANSITION_OFF:
case PR_SWAP_SRC_SNK_SOURCE_OFF:
case PR_SWAP_SRC_SNK_SOURCE_OFF_CC_DEBOUNCED:
case PR_SWAP_SNK_SRC_SOURCE_ON:
/*
* CC state change is expected in PR_SWAP
* Ignore it.
*/
break;
default:
if (tcpm_port_is_disconnected(port))
tcpm_set_state(port, unattached_state(port), 0);
break;
}
}
static void _tcpm_pd_vbus_on(struct tcpm_port *port)
{
tcpm_log_force(port, "VBUS on");
port->vbus_present = true;
switch (port->state) {
case SNK_TRANSITION_SINK_VBUS:
port->explicit_contract = true;
tcpm_set_state(port, SNK_READY, 0);
break;
case SNK_DISCOVERY:
tcpm_set_state(port, SNK_DISCOVERY, 0);
break;
case SNK_DEBOUNCED:
tcpm_set_state(port, tcpm_try_src(port) ? SRC_TRY
: SNK_ATTACHED,
0);
break;
case SNK_HARD_RESET_WAIT_VBUS:
tcpm_set_state(port, SNK_HARD_RESET_SINK_ON, 0);
break;
case SRC_ATTACHED:
tcpm_set_state(port, SRC_STARTUP, 0);
break;
case SRC_HARD_RESET_VBUS_ON:
tcpm_set_state(port, SRC_STARTUP, 0);
break;
case SNK_TRY:
/* Do nothing, waiting for timeout */
break;
case SRC_TRYWAIT:
/* Do nothing, Waiting for Rd to be detected */
break;
case SRC_TRYWAIT_DEBOUNCE:
tcpm_set_state(port, SRC_TRYWAIT, 0);
break;
case SNK_TRY_WAIT_DEBOUNCE:
/* Do nothing, waiting for PD_DEBOUNCE to do be done */
break;
case SNK_TRYWAIT:
/* Do nothing, waiting for tCCDebounce */
break;
case SNK_TRYWAIT_VBUS:
if (tcpm_port_is_sink(port))
tcpm_set_state(port, SNK_ATTACHED, 0);
break;
case SNK_TRYWAIT_DEBOUNCE:
/* Do nothing, waiting for Rp */
break;
case SRC_TRY_WAIT:
case SRC_TRY_DEBOUNCE:
/* Do nothing, waiting for sink detection */
break;
default:
break;
}
}
static void _tcpm_pd_vbus_off(struct tcpm_port *port)
{
tcpm_log_force(port, "VBUS off");
port->vbus_present = false;
port->vbus_never_low = false;
switch (port->state) {
case SNK_HARD_RESET_SINK_OFF:
tcpm_set_state(port, SNK_HARD_RESET_WAIT_VBUS, 0);
break;
case SRC_HARD_RESET_VBUS_OFF:
tcpm_set_state(port, SRC_HARD_RESET_VBUS_ON, 0);
break;
case HARD_RESET_SEND:
break;
case SNK_TRY:
/* Do nothing, waiting for timeout */
break;
case SRC_TRYWAIT:
/* Hand over to state machine if needed */
if (tcpm_port_is_source(port))
tcpm_set_state(port, SRC_TRYWAIT_DEBOUNCE, 0);
break;
case SNK_TRY_WAIT_DEBOUNCE:
/* Do nothing, waiting for PD_DEBOUNCE to do be done */
break;
case SNK_TRYWAIT:
case SNK_TRYWAIT_VBUS:
case SNK_TRYWAIT_DEBOUNCE:
break;
case SNK_ATTACH_WAIT:
tcpm_set_state(port, SNK_UNATTACHED, 0);
break;
case SNK_NEGOTIATE_CAPABILITIES:
break;
case PR_SWAP_SRC_SNK_TRANSITION_OFF:
tcpm_set_state(port, PR_SWAP_SRC_SNK_SOURCE_OFF, 0);
break;
case PR_SWAP_SNK_SRC_SINK_OFF:
/* Do nothing, expected */
break;
case PORT_RESET_WAIT_OFF:
tcpm_set_state(port, tcpm_default_state(port), 0);
break;
case SRC_TRY_WAIT:
case SRC_TRY_DEBOUNCE:
/* Do nothing, waiting for sink detection */
break;
default:
if (port->pwr_role == TYPEC_SINK &&
port->attached)
tcpm_set_state(port, SNK_UNATTACHED, 0);
break;
}
}
static void _tcpm_pd_hard_reset(struct tcpm_port *port)
{
tcpm_log_force(port, "Received hard reset");
/*
* If we keep receiving hard reset requests, executing the hard reset
* must have failed. Revert to error recovery if that happens.
*/
tcpm_set_state(port,
port->hard_reset_count < PD_N_HARD_RESET_COUNT ?
HARD_RESET_START : ERROR_RECOVERY,
0);
}
static void tcpm_pd_event_handler(struct work_struct *work)
{
struct tcpm_port *port = container_of(work, struct tcpm_port,
event_work);
u32 events;
mutex_lock(&port->lock);
spin_lock(&port->pd_event_lock);
while (port->pd_events) {
events = port->pd_events;
port->pd_events = 0;
spin_unlock(&port->pd_event_lock);
if (events & TCPM_RESET_EVENT)
_tcpm_pd_hard_reset(port);
if (events & TCPM_VBUS_EVENT) {
bool vbus;
vbus = port->tcpc->get_vbus(port->tcpc);
if (vbus)
_tcpm_pd_vbus_on(port);
else
_tcpm_pd_vbus_off(port);
}
if (events & TCPM_CC_EVENT) {
enum typec_cc_status cc1, cc2;
if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
_tcpm_cc_change(port, cc1, cc2);
}
spin_lock(&port->pd_event_lock);
}
spin_unlock(&port->pd_event_lock);
mutex_unlock(&port->lock);
}
void tcpm_cc_change(struct tcpm_port *port)
{
spin_lock(&port->pd_event_lock);
port->pd_events |= TCPM_CC_EVENT;
spin_unlock(&port->pd_event_lock);
queue_work(port->wq, &port->event_work);
}
EXPORT_SYMBOL_GPL(tcpm_cc_change);
void tcpm_vbus_change(struct tcpm_port *port)
{
spin_lock(&port->pd_event_lock);
port->pd_events |= TCPM_VBUS_EVENT;
spin_unlock(&port->pd_event_lock);
queue_work(port->wq, &port->event_work);
}
EXPORT_SYMBOL_GPL(tcpm_vbus_change);
void tcpm_pd_hard_reset(struct tcpm_port *port)
{
spin_lock(&port->pd_event_lock);
port->pd_events = TCPM_RESET_EVENT;
spin_unlock(&port->pd_event_lock);
queue_work(port->wq, &port->event_work);
}
EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
static int tcpm_dr_set(struct typec_port *p, enum typec_data_role data)
{
struct tcpm_port *port = typec_get_drvdata(p);
int ret;
mutex_lock(&port->swap_lock);
mutex_lock(&port->lock);
if (port->port_type != TYPEC_PORT_DRP) {
ret = -EINVAL;
goto port_unlock;
}
if (port->state != SRC_READY && port->state != SNK_READY) {
ret = -EAGAIN;
goto port_unlock;
}
if (port->data_role == data) {
ret = 0;
goto port_unlock;
}
/*
* XXX
* 6.3.9: If an alternate mode is active, a request to swap
* alternate modes shall trigger a port reset.
* Reject data role swap request in this case.
*/
if (!port->pd_capable) {
/*
* If the partner is not PD capable, reset the port to
* trigger a role change. This can only work if a preferred
* role is configured, and if it matches the requested role.
*/
if (port->try_role == TYPEC_NO_PREFERRED_ROLE ||
port->try_role == port->pwr_role) {
ret = -EINVAL;
goto port_unlock;
}
port->non_pd_role_swap = true;
tcpm_set_state(port, PORT_RESET, 0);
} else {
tcpm_set_state(port, DR_SWAP_SEND, 0);
}
port->swap_status = 0;
port->swap_pending = true;
reinit_completion(&port->swap_complete);
mutex_unlock(&port->lock);
if (!wait_for_completion_timeout(&port->swap_complete,
msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
ret = -ETIMEDOUT;
else
ret = port->swap_status;
port->non_pd_role_swap = false;
goto swap_unlock;
port_unlock:
mutex_unlock(&port->lock);
swap_unlock:
mutex_unlock(&port->swap_lock);
return ret;
}
static int tcpm_pr_set(struct typec_port *p, enum typec_role role)
{
struct tcpm_port *port = typec_get_drvdata(p);
int ret;
mutex_lock(&port->swap_lock);
mutex_lock(&port->lock);
if (port->port_type != TYPEC_PORT_DRP) {
ret = -EINVAL;
goto port_unlock;
}
if (port->state != SRC_READY && port->state != SNK_READY) {
ret = -EAGAIN;
goto port_unlock;
}
if (role == port->pwr_role) {
ret = 0;
goto port_unlock;
}
port->swap_status = 0;
port->swap_pending = true;
reinit_completion(&port->swap_complete);
tcpm_set_state(port, PR_SWAP_SEND, 0);
mutex_unlock(&port->lock);
if (!wait_for_completion_timeout(&port->swap_complete,
msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
ret = -ETIMEDOUT;
else
ret = port->swap_status;
goto swap_unlock;
port_unlock:
mutex_unlock(&port->lock);
swap_unlock:
mutex_unlock(&port->swap_lock);
return ret;
}
static int tcpm_vconn_set(struct typec_port *p, enum typec_role role)
{
struct tcpm_port *port = typec_get_drvdata(p);
int ret;
mutex_lock(&port->swap_lock);
mutex_lock(&port->lock);
if (port->state != SRC_READY && port->state != SNK_READY) {
ret = -EAGAIN;
goto port_unlock;
}
if (role == port->vconn_role) {
ret = 0;
goto port_unlock;
}
port->swap_status = 0;
port->swap_pending = true;
reinit_completion(&port->swap_complete);
tcpm_set_state(port, VCONN_SWAP_SEND, 0);
mutex_unlock(&port->lock);
if (!wait_for_completion_timeout(&port->swap_complete,
msecs_to_jiffies(PD_ROLE_SWAP_TIMEOUT)))
ret = -ETIMEDOUT;
else
ret = port->swap_status;
goto swap_unlock;
port_unlock:
mutex_unlock(&port->lock);
swap_unlock:
mutex_unlock(&port->swap_lock);
return ret;
}
static int tcpm_try_role(struct typec_port *p, int role)
{
struct tcpm_port *port = typec_get_drvdata(p);
struct tcpc_dev *tcpc = port->tcpc;
int ret = 0;
mutex_lock(&port->lock);
if (tcpc->try_role)
ret = tcpc->try_role(tcpc, role);
if (!ret)
port->try_role = role;
port->try_src_count = 0;
port->try_snk_count = 0;
mutex_unlock(&port->lock);
return ret;
}
static int tcpm_pps_set_op_curr(struct tcpm_port *port, u16 op_curr)
{
unsigned int target_mw;
int ret;
mutex_lock(&port->swap_lock);
mutex_lock(&port->lock);
if (!port->pps_data.active) {
ret = -EOPNOTSUPP;
goto port_unlock;
}
if (port->state != SNK_READY) {
ret = -EAGAIN;
goto port_unlock;
}
if (op_curr > port->pps_data.max_curr) {
ret = -EINVAL;
goto port_unlock;
}
target_mw = (op_curr * port->pps_data.out_volt) / 1000;
if (target_mw < port->operating_snk_mw) {
ret = -EINVAL;
goto port_unlock;
}
/* Round down operating current to align with PPS valid steps */
op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP);
reinit_completion(&port->pps_complete);
port->pps_data.op_curr = op_curr;
port->pps_status = 0;
port->pps_pending = true;
tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
mutex_unlock(&port->lock);
if (!wait_for_completion_timeout(&port->pps_complete,
msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
ret = -ETIMEDOUT;
else
ret = port->pps_status;
goto swap_unlock;
port_unlock:
mutex_unlock(&port->lock);
swap_unlock:
mutex_unlock(&port->swap_lock);
return ret;
}
static int tcpm_pps_set_out_volt(struct tcpm_port *port, u16 out_volt)
{
unsigned int target_mw;
int ret;
mutex_lock(&port->swap_lock);
mutex_lock(&port->lock);
if (!port->pps_data.active) {
ret = -EOPNOTSUPP;
goto port_unlock;
}
if (port->state != SNK_READY) {
ret = -EAGAIN;
goto port_unlock;
}
if (out_volt < port->pps_data.min_volt ||
out_volt > port->pps_data.max_volt) {
ret = -EINVAL;
goto port_unlock;
}
target_mw = (port->pps_data.op_curr * out_volt) / 1000;
if (target_mw < port->operating_snk_mw) {
ret = -EINVAL;
goto port_unlock;
}
/* Round down output voltage to align with PPS valid steps */
out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP);
reinit_completion(&port->pps_complete);
port->pps_data.out_volt = out_volt;
port->pps_status = 0;
port->pps_pending = true;
tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
mutex_unlock(&port->lock);
if (!wait_for_completion_timeout(&port->pps_complete,
msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
ret = -ETIMEDOUT;
else
ret = port->pps_status;
goto swap_unlock;
port_unlock:
mutex_unlock(&port->lock);
swap_unlock:
mutex_unlock(&port->swap_lock);
return ret;
}
static int tcpm_pps_activate(struct tcpm_port *port, bool activate)
{
int ret = 0;
mutex_lock(&port->swap_lock);
mutex_lock(&port->lock);
if (!port->pps_data.supported) {
ret = -EOPNOTSUPP;
goto port_unlock;
}
/* Trying to deactivate PPS when already deactivated so just bail */
if (!port->pps_data.active && !activate)
goto port_unlock;
if (port->state != SNK_READY) {
ret = -EAGAIN;
goto port_unlock;
}
reinit_completion(&port->pps_complete);
port->pps_status = 0;
port->pps_pending = true;
/* Trigger PPS request or move back to standard PDO contract */
if (activate) {
port->pps_data.out_volt = port->supply_voltage;
port->pps_data.op_curr = port->current_limit;
tcpm_set_state(port, SNK_NEGOTIATE_PPS_CAPABILITIES, 0);
} else {
tcpm_set_state(port, SNK_NEGOTIATE_CAPABILITIES, 0);
}
mutex_unlock(&port->lock);
if (!wait_for_completion_timeout(&port->pps_complete,
msecs_to_jiffies(PD_PPS_CTRL_TIMEOUT)))
ret = -ETIMEDOUT;
else
ret = port->pps_status;
goto swap_unlock;
port_unlock:
mutex_unlock(&port->lock);
swap_unlock:
mutex_unlock(&port->swap_lock);
return ret;
}
static void tcpm_init(struct tcpm_port *port)
{
enum typec_cc_status cc1, cc2;
port->tcpc->init(port->tcpc);
tcpm_reset_port(port);
/*
* XXX
* Should possibly wait for VBUS to settle if it was enabled locally
* since tcpm_reset_port() will disable VBUS.
*/
port->vbus_present = port->tcpc->get_vbus(port->tcpc);
if (port->vbus_present)
port->vbus_never_low = true;
tcpm_set_state(port, tcpm_default_state(port), 0);
if (port->tcpc->get_cc(port->tcpc, &cc1, &cc2) == 0)
_tcpm_cc_change(port, cc1, cc2);
/*
* Some adapters need a clean slate at startup, and won't recover
* otherwise. So do not try to be fancy and force a clean disconnect.
*/
tcpm_set_state(port, PORT_RESET, 0);
}
static int tcpm_port_type_set(struct typec_port *p, enum typec_port_type type)
{
struct tcpm_port *port = typec_get_drvdata(p);
mutex_lock(&port->lock);
if (type == port->port_type)
goto port_unlock;
port->port_type = type;
if (!port->connected) {
tcpm_set_state(port, PORT_RESET, 0);
} else if (type == TYPEC_PORT_SNK) {
if (!(port->pwr_role == TYPEC_SINK &&
port->data_role == TYPEC_DEVICE))
tcpm_set_state(port, PORT_RESET, 0);
} else if (type == TYPEC_PORT_SRC) {
if (!(port->pwr_role == TYPEC_SOURCE &&
port->data_role == TYPEC_HOST))
tcpm_set_state(port, PORT_RESET, 0);
}
port_unlock:
mutex_unlock(&port->lock);
return 0;
}
static const struct typec_operations tcpm_ops = {
.try_role = tcpm_try_role,
.dr_set = tcpm_dr_set,
.pr_set = tcpm_pr_set,
.vconn_set = tcpm_vconn_set,
.port_type_set = tcpm_port_type_set
};
void tcpm_tcpc_reset(struct tcpm_port *port)
{
mutex_lock(&port->lock);
/* XXX: Maintain PD connection if possible? */
tcpm_init(port);
mutex_unlock(&port->lock);
}
EXPORT_SYMBOL_GPL(tcpm_tcpc_reset);
static int tcpm_fw_get_caps(struct tcpm_port *port,
struct fwnode_handle *fwnode)
{
const char *cap_str;
int ret;
u32 mw;
if (!fwnode)
return -EINVAL;
/* USB data support is optional */
ret = fwnode_property_read_string(fwnode, "data-role", &cap_str);
if (ret == 0) {
ret = typec_find_port_data_role(cap_str);
if (ret < 0)
return ret;
port->typec_caps.data = ret;
}
ret = fwnode_property_read_string(fwnode, "power-role", &cap_str);
if (ret < 0)
return ret;
ret = typec_find_port_power_role(cap_str);
if (ret < 0)
return ret;
port->typec_caps.type = ret;
port->port_type = port->typec_caps.type;
if (port->port_type == TYPEC_PORT_SNK)
goto sink;
/* Get source pdos */
ret = fwnode_property_count_u32(fwnode, "source-pdos");
if (ret <= 0)
return -EINVAL;
port->nr_src_pdo = min(ret, PDO_MAX_OBJECTS);
ret = fwnode_property_read_u32_array(fwnode, "source-pdos",
port->src_pdo, port->nr_src_pdo);
if ((ret < 0) || tcpm_validate_caps(port, port->src_pdo,
port->nr_src_pdo))
return -EINVAL;
if (port->port_type == TYPEC_PORT_SRC)
return 0;
/* Get the preferred power role for DRP */
ret = fwnode_property_read_string(fwnode, "try-power-role", &cap_str);
if (ret < 0)
return ret;
port->typec_caps.prefer_role = typec_find_power_role(cap_str);
if (port->typec_caps.prefer_role < 0)
return -EINVAL;
sink:
/* Get sink pdos */
ret = fwnode_property_count_u32(fwnode, "sink-pdos");
if (ret <= 0)
return -EINVAL;
port->nr_snk_pdo = min(ret, PDO_MAX_OBJECTS);
ret = fwnode_property_read_u32_array(fwnode, "sink-pdos",
port->snk_pdo, port->nr_snk_pdo);
if ((ret < 0) || tcpm_validate_caps(port, port->snk_pdo,
port->nr_snk_pdo))
return -EINVAL;
if (fwnode_property_read_u32(fwnode, "op-sink-microwatt", &mw) < 0)
return -EINVAL;
port->operating_snk_mw = mw / 1000;
port->self_powered = fwnode_property_read_bool(fwnode, "self-powered");
return 0;
}
/* Power Supply access to expose source power information */
enum tcpm_psy_online_states {
TCPM_PSY_OFFLINE = 0,
TCPM_PSY_FIXED_ONLINE,
TCPM_PSY_PROG_ONLINE,
};
static enum power_supply_property tcpm_psy_props[] = {
POWER_SUPPLY_PROP_USB_TYPE,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_MIN,
POWER_SUPPLY_PROP_VOLTAGE_MAX,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_MAX,
POWER_SUPPLY_PROP_CURRENT_NOW,
};
static int tcpm_psy_get_online(struct tcpm_port *port,
union power_supply_propval *val)
{
if (port->vbus_charge) {
if (port->pps_data.active)
val->intval = TCPM_PSY_PROG_ONLINE;
else
val->intval = TCPM_PSY_FIXED_ONLINE;
} else {
val->intval = TCPM_PSY_OFFLINE;
}
return 0;
}
static int tcpm_psy_get_voltage_min(struct tcpm_port *port,
union power_supply_propval *val)
{
if (port->pps_data.active)
val->intval = port->pps_data.min_volt * 1000;
else
val->intval = port->supply_voltage * 1000;
return 0;
}
static int tcpm_psy_get_voltage_max(struct tcpm_port *port,
union power_supply_propval *val)
{
if (port->pps_data.active)
val->intval = port->pps_data.max_volt * 1000;
else
val->intval = port->supply_voltage * 1000;
return 0;
}
static int tcpm_psy_get_voltage_now(struct tcpm_port *port,
union power_supply_propval *val)
{
val->intval = port->supply_voltage * 1000;
return 0;
}
static int tcpm_psy_get_current_max(struct tcpm_port *port,
union power_supply_propval *val)
{
if (port->pps_data.active)
val->intval = port->pps_data.max_curr * 1000;
else
val->intval = port->current_limit * 1000;
return 0;
}
static int tcpm_psy_get_current_now(struct tcpm_port *port,
union power_supply_propval *val)
{
val->intval = port->current_limit * 1000;
return 0;
}
static int tcpm_psy_get_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct tcpm_port *port = power_supply_get_drvdata(psy);
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_USB_TYPE:
val->intval = port->usb_type;
break;
case POWER_SUPPLY_PROP_ONLINE:
ret = tcpm_psy_get_online(port, val);
break;
case POWER_SUPPLY_PROP_VOLTAGE_MIN:
ret = tcpm_psy_get_voltage_min(port, val);
break;
case POWER_SUPPLY_PROP_VOLTAGE_MAX:
ret = tcpm_psy_get_voltage_max(port, val);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = tcpm_psy_get_voltage_now(port, val);
break;
case POWER_SUPPLY_PROP_CURRENT_MAX:
ret = tcpm_psy_get_current_max(port, val);
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
ret = tcpm_psy_get_current_now(port, val);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int tcpm_psy_set_online(struct tcpm_port *port,
const union power_supply_propval *val)
{
int ret;
switch (val->intval) {
case TCPM_PSY_FIXED_ONLINE:
ret = tcpm_pps_activate(port, false);
break;
case TCPM_PSY_PROG_ONLINE:
ret = tcpm_pps_activate(port, true);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int tcpm_psy_set_prop(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct tcpm_port *port = power_supply_get_drvdata(psy);
int ret;
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
ret = tcpm_psy_set_online(port, val);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
if (val->intval < port->pps_data.min_volt * 1000 ||
val->intval > port->pps_data.max_volt * 1000)
ret = -EINVAL;
else
ret = tcpm_pps_set_out_volt(port, val->intval / 1000);
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
if (val->intval > port->pps_data.max_curr * 1000)
ret = -EINVAL;
else
ret = tcpm_pps_set_op_curr(port, val->intval / 1000);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int tcpm_psy_prop_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
case POWER_SUPPLY_PROP_CURRENT_NOW:
return 1;
default:
return 0;
}
}
static enum power_supply_usb_type tcpm_psy_usb_types[] = {
POWER_SUPPLY_USB_TYPE_C,
POWER_SUPPLY_USB_TYPE_PD,
POWER_SUPPLY_USB_TYPE_PD_PPS,
};
static const char *tcpm_psy_name_prefix = "tcpm-source-psy-";
static int devm_tcpm_psy_register(struct tcpm_port *port)
{
struct power_supply_config psy_cfg = {};
const char *port_dev_name = dev_name(port->dev);
size_t psy_name_len = strlen(tcpm_psy_name_prefix) +
strlen(port_dev_name) + 1;
char *psy_name;
psy_cfg.drv_data = port;
psy_cfg.fwnode = dev_fwnode(port->dev);
psy_name = devm_kzalloc(port->dev, psy_name_len, GFP_KERNEL);
if (!psy_name)
return -ENOMEM;
snprintf(psy_name, psy_name_len, "%s%s", tcpm_psy_name_prefix,
port_dev_name);
port->psy_desc.name = psy_name;
port->psy_desc.type = POWER_SUPPLY_TYPE_USB,
port->psy_desc.usb_types = tcpm_psy_usb_types;
port->psy_desc.num_usb_types = ARRAY_SIZE(tcpm_psy_usb_types);
port->psy_desc.properties = tcpm_psy_props,
port->psy_desc.num_properties = ARRAY_SIZE(tcpm_psy_props),
port->psy_desc.get_property = tcpm_psy_get_prop,
port->psy_desc.set_property = tcpm_psy_set_prop,
port->psy_desc.property_is_writeable = tcpm_psy_prop_writeable,
port->usb_type = POWER_SUPPLY_USB_TYPE_C;
port->psy = devm_power_supply_register(port->dev, &port->psy_desc,
&psy_cfg);
return PTR_ERR_OR_ZERO(port->psy);
}
struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
{
struct tcpm_port *port;
int err;
if (!dev || !tcpc ||
!tcpc->get_vbus || !tcpc->set_cc || !tcpc->get_cc ||
!tcpc->set_polarity || !tcpc->set_vconn || !tcpc->set_vbus ||
!tcpc->set_pd_rx || !tcpc->set_roles || !tcpc->pd_transmit)
return ERR_PTR(-EINVAL);
port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
if (!port)
return ERR_PTR(-ENOMEM);
port->dev = dev;
port->tcpc = tcpc;
mutex_init(&port->lock);
mutex_init(&port->swap_lock);
port->wq = create_singlethread_workqueue(dev_name(dev));
if (!port->wq)
return ERR_PTR(-ENOMEM);
INIT_DELAYED_WORK(&port->state_machine, tcpm_state_machine_work);
INIT_DELAYED_WORK(&port->vdm_state_machine, vdm_state_machine_work);
INIT_WORK(&port->event_work, tcpm_pd_event_handler);
spin_lock_init(&port->pd_event_lock);
init_completion(&port->tx_complete);
init_completion(&port->swap_complete);
init_completion(&port->pps_complete);
tcpm_debugfs_init(port);
err = tcpm_fw_get_caps(port, tcpc->fwnode);
if (err < 0)
goto out_destroy_wq;
port->try_role = port->typec_caps.prefer_role;
port->typec_caps.fwnode = tcpc->fwnode;
port->typec_caps.revision = 0x0120; /* Type-C spec release 1.2 */
port->typec_caps.pd_revision = 0x0300; /* USB-PD spec release 3.0 */
port->typec_caps.driver_data = port;
port->typec_caps.ops = &tcpm_ops;
port->partner_desc.identity = &port->partner_ident;
port->port_type = port->typec_caps.type;
port->role_sw = usb_role_switch_get(port->dev);
if (IS_ERR(port->role_sw)) {
err = PTR_ERR(port->role_sw);
goto out_destroy_wq;
}
err = devm_tcpm_psy_register(port);
if (err)
goto out_role_sw_put;
port->typec_port = typec_register_port(port->dev, &port->typec_caps);
if (IS_ERR(port->typec_port)) {
err = PTR_ERR(port->typec_port);
goto out_role_sw_put;
}
mutex_lock(&port->lock);
tcpm_init(port);
mutex_unlock(&port->lock);
tcpm_log(port, "%s: registered", dev_name(dev));
return port;
out_role_sw_put:
usb_role_switch_put(port->role_sw);
out_destroy_wq:
tcpm_debugfs_exit(port);
destroy_workqueue(port->wq);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(tcpm_register_port);
void tcpm_unregister_port(struct tcpm_port *port)
{
int i;
tcpm_reset_port(port);
for (i = 0; i < ARRAY_SIZE(port->port_altmode); i++)
typec_unregister_altmode(port->port_altmode[i]);
typec_unregister_port(port->typec_port);
usb_role_switch_put(port->role_sw);
tcpm_debugfs_exit(port);
destroy_workqueue(port->wq);
}
EXPORT_SYMBOL_GPL(tcpm_unregister_port);
MODULE_AUTHOR("Guenter Roeck <groeck@chromium.org>");
MODULE_DESCRIPTION("USB Type-C Port Manager");
MODULE_LICENSE("GPL");