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Message-ID: <Zdf05szkJe7R9aq2@google.com>
Date: Fri, 23 Feb 2024 01:29:10 +0000
From: Benson Leung <bleung@...gle.com>
To: Jameson Thies <jthies@...gle.com>
Cc: heikki.krogerus@...ux.intel.com, linux-usb@...r.kernel.org,
pmalani@...omium.org, abhishekpandit@...omium.org,
andersson@...nel.org, dmitry.baryshkov@...aro.org,
fabrice.gasnier@...s.st.com, gregkh@...uxfoundation.org,
hdegoede@...hat.com, neil.armstrong@...aro.org,
rajaram.regupathy@...el.com, saranya.gopal@...el.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] usb: typec: ucsi: Register cables based on
GET_CABLE_PROPERTY
Hi Jameson,
On Fri, Feb 23, 2024 at 01:03:26AM +0000, Jameson Thies wrote:
> Register cables with the Type-C Connector Class in the UCSI driver based
> on the PPM response to GET_CABLE_PROPERTY. Registered cable properties
> include plug type, cable type and major revision.
>
> Signed-off-by: Jameson Thies <jthies@...gle.com>
Reviewed-by: Benson Leung <bleung@...omium.org>
> ---
> Tested on v6.6 kernel. Expected cable properties populate the USB Type-C
> connector class sysfs paths:
> redrix-rev3 /sys/class/typec # ls port2-cable
> device identity plug_type port2-plug0 power subsystem type uevent
> usb_power_delivery_revision
>
> drivers/usb/typec/ucsi/ucsi.c | 69 +++++++++++++++++++++++++++++++++++
> drivers/usb/typec/ucsi/ucsi.h | 5 +++
> 2 files changed, 74 insertions(+)
>
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index ae105383e69e..15e82f5fab37 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -734,6 +734,50 @@ static void ucsi_unregister_partner_pdos(struct ucsi_connector *con)
> con->partner_pd = NULL;
> }
>
> +static int ucsi_register_cable(struct ucsi_connector *con)
> +{
> + struct typec_cable *cable;
> + struct typec_cable_desc desc = {};
> +
> + switch (UCSI_CABLE_PROP_FLAG_PLUG_TYPE(con->cable_prop.flags)) {
> + case UCSI_CABLE_PROPERTY_PLUG_TYPE_A:
> + desc.type = USB_PLUG_TYPE_A;
> + break;
> + case UCSI_CABLE_PROPERTY_PLUG_TYPE_B:
> + desc.type = USB_PLUG_TYPE_B;
> + break;
> + case UCSI_CABLE_PROPERTY_PLUG_TYPE_C:
> + desc.type = USB_PLUG_TYPE_C;
> + break;
> + default:
> + desc.type = USB_PLUG_NONE;
> + break;
> + }
> +
> + desc.active = !!(UCSI_CABLE_PROP_FLAG_ACTIVE_CABLE & con->cable_prop.flags);
> + desc.pd_revision = UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV_AS_BCD(con->cable_prop.flags);
> +
> + cable = typec_register_cable(con->port, &desc);
> + if (IS_ERR(cable)) {
> + dev_err(con->ucsi->dev,
> + "con%d: failed to register cable (%ld)\n", con->num,
> + PTR_ERR(cable));
> + return PTR_ERR(cable);
> + }
> +
> + con->cable = cable;
> + return 0;
> +}
> +
> +static void ucsi_unregister_cable(struct ucsi_connector *con)
> +{
> + if (!con->cable)
> + return;
> +
> + typec_unregister_cable(con->cable);
> + con->cable = NULL;
> +}
> +
> static void ucsi_pwr_opmode_change(struct ucsi_connector *con)
> {
> switch (UCSI_CONSTAT_PWR_OPMODE(con->status.flags)) {
> @@ -807,6 +851,7 @@ static void ucsi_unregister_partner(struct ucsi_connector *con)
> typec_partner_set_usb_power_delivery(con->partner, NULL);
> ucsi_unregister_partner_pdos(con);
> ucsi_unregister_altmodes(con, UCSI_RECIPIENT_SOP);
> + ucsi_unregister_cable(con);
> typec_unregister_partner(con->partner);
> con->partner = NULL;
> }
> @@ -907,6 +952,28 @@ static int ucsi_check_connection(struct ucsi_connector *con)
> return 0;
> }
>
> +static int ucsi_check_cable(struct ucsi_connector *con)
> +{
> + u64 command;
> + int ret;
> +
> + if (con->cable)
> + return 0;
> +
> + command = UCSI_GET_CABLE_PROPERTY | UCSI_CONNECTOR_NUMBER(con->num);
> + ret = ucsi_send_command(con->ucsi, command, &con->cable_prop, sizeof(con->cable_prop));
> + if (ret < 0) {
> + dev_err(con->ucsi->dev, "GET_CABLE_PROPERTY failed (%d)\n", ret);
> + return ret;
> + }
> +
> + ret = ucsi_register_cable(con);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> static void ucsi_handle_connector_change(struct work_struct *work)
> {
> struct ucsi_connector *con = container_of(work, struct ucsi_connector,
> @@ -948,6 +1015,7 @@ static void ucsi_handle_connector_change(struct work_struct *work)
> ucsi_register_partner(con);
> ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
> ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
> + ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
>
> if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
> UCSI_CONSTAT_PWR_OPMODE_PD)
> @@ -1346,6 +1414,7 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
> ucsi_register_partner(con);
> ucsi_pwr_opmode_change(con);
> ucsi_port_psy_changed(con);
> + ucsi_check_cable(con);
> }
>
> /* Only notify USB controller if partner supports USB data */
> diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
> index 469a2baf472e..f0aabef0b7c6 100644
> --- a/drivers/usb/typec/ucsi/ucsi.h
> +++ b/drivers/usb/typec/ucsi/ucsi.h
> @@ -265,6 +265,9 @@ struct ucsi_cable_property {
> #define UCSI_CABLE_PROPERTY_PLUG_TYPE_C 2
> #define UCSI_CABLE_PROPERTY_PLUG_OTHER 3
> #define UCSI_CABLE_PROP_FLAG_MODE_SUPPORT BIT(5)
> +#define UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV(_f_) (((_f_) & GENMASK(7, 6)) >> 6)
> +#define UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV_AS_BCD(_f_) \
> + UCSI_SPEC_REVISION_TO_BCD(UCSI_CABLE_PROP_FLAG_PD_MAJOR_REV(_f_))
> u8 latency;
> } __packed;
>
> @@ -400,6 +403,7 @@ struct ucsi_connector {
>
> struct typec_port *port;
> struct typec_partner *partner;
> + struct typec_cable *cable;
>
> struct typec_altmode *port_altmode[UCSI_MAX_ALTMODES];
> struct typec_altmode *partner_altmode[UCSI_MAX_ALTMODES];
> @@ -408,6 +412,7 @@ struct ucsi_connector {
>
> struct ucsi_connector_status status;
> struct ucsi_connector_capability cap;
> + struct ucsi_cable_property cable_prop;
> struct power_supply *psy;
> struct power_supply_desc psy_desc;
> u32 rdo;
> --
> 2.44.0.rc0.258.g7320e95886-goog
>
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