On 16 April 2019 21:08, Hans de Goede wrote:
> Some tcpc device-drivers need to explicitly be told to watch for connection
> events, otherwise the tcpc will not generate any TCPM_CC_EVENTs and devices
> being plugged into the Type-C port will not be noticed.
>
> For dual-role ports tcpm_start_drp_toggling() is used to tell the tcpc to
> watch for connection events. Sofar we lack a similar callback to the tcpc
> for single-role ports. With some tcpc-s such as the fusb302 this means
> no TCPM_CC_EVENTs will be generated when the port is configured as a
> single-role port.
>
> This commit renames start_drp_toggling to start_toggling and since the
> device-properties are parsed by the tcpm-core, adds a port_type parameter
> to the start_toggling callback so that the tcpc_dev driver knows the
> port-type and can act accordingly when it starts toggling.
>
> The new start_toggling callback now always gets called if defined, instead
> of only being called for DRP ports.
>
> To avoid this causing undesirable functional changes all existing
> start_drp_toggling implementations are not only renamed to start_toggling,
> but also get a port_type check added and return -EOPNOTSUPP when port_type
> is not DRP.
>
> Fixes: ea3b4d5523bc("usb: typec: fusb302: Resolve fixed power role ...")
> Cc: Adam Thomson <Adam.Thomson.Opensource@xxxxxxxxxxx>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
For DRP & Sink only toggling scenarios, with FUSB302 TCPC:
Tested-by: Adam Thomson <Adam.Thomson.Opensource@xxxxxxxxxxx>
> ---
> Changes in v2:
> -Rename start_drp_toggling to start_toggling and make it multi-purpose,
> rather then adding a new start_srp_connection_detect callback
> ---
> drivers/usb/typec/tcpm/fusb302.c | 10 +++++++---
> drivers/usb/typec/tcpm/tcpci.c | 10 +++++++---
> drivers/usb/typec/tcpm/tcpm.c | 32 ++++++++++++++------------------
> drivers/usb/typec/tcpm/wcove.c | 10 +++++++---
> include/linux/usb/tcpm.h | 13 +++++++------
> 5 files changed, 42 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm/fusb302.c
> b/drivers/usb/typec/tcpm/fusb302.c
> index 6ea6199caafa..6d83891cc895 100644
> --- a/drivers/usb/typec/tcpm/fusb302.c
> +++ b/drivers/usb/typec/tcpm/fusb302.c
> @@ -876,13 +876,17 @@ static int tcpm_set_roles(struct tcpc_dev *dev, bool
> attached,
> return ret;
> }
>
> -static int tcpm_start_drp_toggling(struct tcpc_dev *dev,
> - enum typec_cc_status cc)
> +static int tcpm_start_toggling(struct tcpc_dev *dev,
> + enum typec_port_type port_type,
> + enum typec_cc_status cc)
> {
> struct fusb302_chip *chip = container_of(dev, struct fusb302_chip,
> tcpc_dev);
> int ret = 0;
>
> + if (port_type != TYPEC_PORT_DRP)
> + return -EOPNOTSUPP;
> +
> mutex_lock(&chip->lock);
> ret = fusb302_set_src_current(chip, cc_src_current[cc]);
> if (ret < 0) {
> @@ -1094,7 +1098,7 @@ static void init_tcpc_dev(struct tcpc_dev
> *fusb302_tcpc_dev)
> fusb302_tcpc_dev->set_vbus = tcpm_set_vbus;
> fusb302_tcpc_dev->set_pd_rx = tcpm_set_pd_rx;
> fusb302_tcpc_dev->set_roles = tcpm_set_roles;
> - fusb302_tcpc_dev->start_drp_toggling = tcpm_start_drp_toggling;
> + fusb302_tcpc_dev->start_toggling = tcpm_start_toggling;
> fusb302_tcpc_dev->pd_transmit = tcpm_pd_transmit;
> }
>
> diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
> index ac6b418b15f1..c1f7073a56de 100644
> --- a/drivers/usb/typec/tcpm/tcpci.c
> +++ b/drivers/usb/typec/tcpm/tcpci.c
> @@ -100,13 +100,17 @@ static int tcpci_set_cc(struct tcpc_dev *tcpc, enum
> typec_cc_status cc)
> return 0;
> }
>
> -static int tcpci_start_drp_toggling(struct tcpc_dev *tcpc,
> - enum typec_cc_status cc)
> +static int tcpci_start_toggling(struct tcpc_dev *tcpc,
> + enum typec_port_type port_type,
> + enum typec_cc_status cc)
> {
> int ret;
> struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
> unsigned int reg = TCPC_ROLE_CTRL_DRP;
>
> + if (port_type != TYPEC_PORT_DRP)
> + return -EOPNOTSUPP;
> +
> /* Handle vendor drp toggling */
> if (tcpci->data->start_drp_toggling) {
> ret = tcpci->data->start_drp_toggling(tcpci, tcpci->data, cc);
> @@ -511,7 +515,7 @@ struct tcpci *tcpci_register_port(struct device *dev, struct
> tcpci_data *data)
> tcpci->tcpc.get_cc = tcpci_get_cc;
> tcpci->tcpc.set_polarity = tcpci_set_polarity;
> tcpci->tcpc.set_vconn = tcpci_set_vconn;
> - tcpci->tcpc.start_drp_toggling = tcpci_start_drp_toggling;
> + tcpci->tcpc.start_toggling = tcpci_start_toggling;
>
> tcpci->tcpc.set_pd_rx = tcpci_set_pd_rx;
> tcpci->tcpc.set_roles = tcpci_set_roles;
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index a2233d72ae7c..fba32d84e578 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -31,7 +31,7 @@
>
> #define FOREACH_STATE(S) \
> S(INVALID_STATE), \
> - S(DRP_TOGGLING), \
> + S(TOGGLING), \
> S(SRC_UNATTACHED), \
> S(SRC_ATTACH_WAIT), \
> S(SRC_ATTACHED), \
> @@ -472,7 +472,7 @@ static void tcpm_log(struct tcpm_port *port, const char
> *fmt, ...)
> /* Do not log while disconnected and unattached */
> if (tcpm_port_is_disconnected(port) &&
> (port->state == SRC_UNATTACHED || port->state ==
> SNK_UNATTACHED ||
> - port->state == DRP_TOGGLING))
> + port->state == TOGGLING))
> return;
>
> va_start(args, fmt);
> @@ -2540,20 +2540,16 @@ static int tcpm_set_charge(struct tcpm_port *port,
> bool charge)
> return 0;
> }
>
> -static bool tcpm_start_drp_toggling(struct tcpm_port *port,
> - enum typec_cc_status cc)
> +static bool tcpm_start_toggling(struct tcpm_port *port, enum typec_cc_status
> cc)
> {
> int ret;
>
> - if (port->tcpc->start_drp_toggling &&
> - port->port_type == TYPEC_PORT_DRP) {
> - tcpm_log_force(port, "Start DRP toggling");
> - ret = port->tcpc->start_drp_toggling(port->tcpc, cc);
> - if (!ret)
> - return true;
> - }
> + if (!port->tcpc->start_toggling)
> + return false;
>
> - 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)
> @@ -2847,15 +2843,15 @@ static void run_state_machine(struct tcpm_port
> *port)
>
> port->enter_state = port->state;
> switch (port->state) {
> - case DRP_TOGGLING:
> + 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_drp_toggling(port, tcpm_rp_cc(port))) {
> - tcpm_set_state(port, DRP_TOGGLING, 0);
> + if (tcpm_start_toggling(port, tcpm_rp_cc(port))) {
> + tcpm_set_state(port, TOGGLING, 0);
> break;
> }
> tcpm_set_cc(port, tcpm_rp_cc(port));
> @@ -3053,8 +3049,8 @@ static void run_state_machine(struct tcpm_port *port)
> tcpm_swap_complete(port, -ENOTCONN);
> tcpm_pps_complete(port, -ENOTCONN);
> tcpm_snk_detach(port);
> - if (tcpm_start_drp_toggling(port, TYPEC_CC_RD)) {
> - tcpm_set_state(port, DRP_TOGGLING, 0);
> + if (tcpm_start_toggling(port, TYPEC_CC_RD)) {
> + tcpm_set_state(port, TOGGLING, 0);
> break;
> }
> tcpm_set_cc(port, TYPEC_CC_RD);
> @@ -3621,7 +3617,7 @@ static void _tcpm_cc_change(struct tcpm_port *port,
> enum typec_cc_status cc1,
> : "connected");
>
> switch (port->state) {
> - case DRP_TOGGLING:
> + 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);
> diff --git a/drivers/usb/typec/tcpm/wcove.c b/drivers/usb/typec/tcpm/wcove.c
> index 6770afd40765..f1f8f45e2f3d 100644
> --- a/drivers/usb/typec/tcpm/wcove.c
> +++ b/drivers/usb/typec/tcpm/wcove.c
> @@ -416,12 +416,16 @@ static int wcove_pd_transmit(struct tcpc_dev *tcpc,
> return regmap_write(wcove->regmap, USBC_TXCMD, cmd |
> USBC_TXCMD_START);
> }
>
> -static int wcove_start_drp_toggling(struct tcpc_dev *tcpc,
> - enum typec_cc_status cc)
> +static int wcove_start_toggling(struct tcpc_dev *tcpc,
> + enum typec_port_type port_type,
> + enum typec_cc_status cc)
> {
> struct wcove_typec *wcove = tcpc_to_wcove(tcpc);
> unsigned int usbc_ctrl;
>
> + if (port_type != TYPEC_PORT_DRP)
> + return -EOPNOTSUPP;
> +
> usbc_ctrl = USBC_CONTROL1_MODE_DRP |
> USBC_CONTROL1_DRPTOGGLE_RANDOM;
>
> switch (cc) {
> @@ -642,7 +646,7 @@ static int wcove_typec_probe(struct platform_device
> *pdev)
> wcove->tcpc.set_polarity = wcove_set_polarity;
> wcove->tcpc.set_vconn = wcove_set_vconn;
> wcove->tcpc.set_current_limit = wcove_set_current_limit;
> - wcove->tcpc.start_drp_toggling = wcove_start_drp_toggling;
> + wcove->tcpc.start_toggling = wcove_start_toggling;
>
> wcove->tcpc.set_pd_rx = wcove_set_pd_rx;
> wcove->tcpc.set_roles = wcove_set_roles;
> diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h
> index 0c532ca3f079..36a15dcadc53 100644
> --- a/include/linux/usb/tcpm.h
> +++ b/include/linux/usb/tcpm.h
> @@ -121,10 +121,10 @@ struct tcpc_config {
> * with partner.
> * @set_pd_rx: Called to enable or disable reception of PD messages
> * @set_roles: Called to set power and data roles
> - * @start_drp_toggling:
> - * Optional; if supported by hardware, called to start DRP
> - * toggling. DRP toggling is stopped automatically if
> - * a connection is established.
> + * @start_toggling:
> + * Optional; if supported by hardware, called to start dual-role
> + * toggling or single-role connection detection. Toggling stops
> + * automatically if a connection is established.
> * @try_role: Optional; called to set a preferred role
> * @pd_transmit:Called to transmit PD message
> * @mux: Pointer to multiplexer data
> @@ -147,8 +147,9 @@ struct tcpc_dev {
> int (*set_pd_rx)(struct tcpc_dev *dev, bool on);
> int (*set_roles)(struct tcpc_dev *dev, bool attached,
> enum typec_role role, enum typec_data_role data);
> - int (*start_drp_toggling)(struct tcpc_dev *dev,
> - enum typec_cc_status cc);
> + int (*start_toggling)(struct tcpc_dev *dev,
> + enum typec_port_type port_type,
> + enum typec_cc_status cc);
> int (*try_role)(struct tcpc_dev *dev, int role);
> int (*pd_transmit)(struct tcpc_dev *dev, enum tcpm_transmit_type
> type,
> const struct pd_message *msg);
> --
> 2.21.0
