From b91264fe1613cbe50fc2f2a0f5aed49ddbf1d6b1 Mon Sep 17 00:00:00 2001 From: Ondrej Jirman Date: Thu, 7 Sep 2023 21:09:14 +0200 Subject: [PATCH 435/480] usb: tcpci: Add support for extcon based input current limit determination This allows backwards compatibility with DCP/CDP cahrger detection based on D+/D- USB2.0 pins state. Signed-off-by: Ondrej Jirman --- drivers/usb/typec/tcpm/tcpci.c | 45 ++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c index 19ab6647af70..427caf377126 100644 --- a/drivers/usb/typec/tcpm/tcpci.c +++ b/drivers/usb/typec/tcpm/tcpci.c @@ -7,6 +7,7 @@ #include #include +#include #include #include #include @@ -41,6 +42,8 @@ struct tcpci { struct tcpc_dev tcpc; struct tcpci_data *data; + + struct extcon_dev *extcon; }; struct tcpci_chip { @@ -828,6 +831,47 @@ static int tcpci_parse_config(struct tcpci *tcpci) return 0; } +static int tcpci_get_current_limit(struct tcpc_dev *dev) +{ + struct tcpci *tcpci = tcpc_to_tcpci(dev); + int current_limit = 0; + unsigned long timeout; + + /* + * To avoid cycles in OF dependencies, we get extcon when necessary + * outside of probe function. + */ + if (of_property_read_bool(tcpci->dev->of_node, "extcon") && !tcpci->extcon) { + tcpci->extcon = extcon_get_edev_by_phandle(tcpci->dev, 0); + if (IS_ERR(tcpci->extcon)) + tcpci->extcon = NULL; + } + + if (!tcpci->extcon) + return 0; + + /* + * USB2 Charger detection may still be in progress when we get here, + * this can take upto 600ms, wait 1000ms max. + */ + timeout = jiffies + msecs_to_jiffies(1000); + do { + if (extcon_get_state(tcpci->extcon, EXTCON_CHG_USB_SDP) == 1) + current_limit = 500; + + if (extcon_get_state(tcpci->extcon, EXTCON_CHG_USB_CDP) == 1 || + extcon_get_state(tcpci->extcon, EXTCON_CHG_USB_ACA) == 1) + current_limit = 1500; + + if (extcon_get_state(tcpci->extcon, EXTCON_CHG_USB_DCP) == 1) + current_limit = 2000; + + msleep(50); + } while (current_limit == 0 && time_before(jiffies, timeout)); + + return current_limit; +} + struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data) { struct tcpci *tcpci; @@ -860,6 +904,7 @@ struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data) tcpci->tcpc.set_partner_usb_comm_capable = tcpci_set_partner_usb_comm_capable; tcpci->tcpc.cable_comm_capable = tcpci_cable_comm_capable; tcpci->tcpc.attempt_vconn_swap_discovery = tcpci_attempt_vconn_swap_discovery; + tcpci->tcpc.get_current_limit = tcpci_get_current_limit; if (tcpci->data->check_contaminant) tcpci->tcpc.check_contaminant = tcpci_check_contaminant; -- 2.49.0