From patchwork Sat Jan 14 09:23:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Badhri Jagan Sridharan X-Patchwork-Id: 643091 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7C371C46467 for ; Sat, 14 Jan 2023 09:23:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229920AbjANJXf (ORCPT ); Sat, 14 Jan 2023 04:23:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229741AbjANJXe (ORCPT ); Sat, 14 Jan 2023 04:23:34 -0500 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E590B5BBB for ; Sat, 14 Jan 2023 01:23:32 -0800 (PST) Received: by mail-yb1-xb4a.google.com with SMTP id r7-20020a25c107000000b006ff55ac0ee7so25440384ybf.15 for ; Sat, 14 Jan 2023 01:23:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=Rpvv8QTlCvX0ce4P9NdbIIZUZ16fQDB1rK9Grm+aNvc=; b=e7sUy9B65d5isCQdh6b+/iCcQs2pLL/SFkmuflaI0z4dARc/jjfa3/UBIYsS2WlLRw Zar11jT+yxSL03gcWsA9fE7IfDeyTmM5BmLh/lSCAXOVF8DtUq6tnS7DlM70aAd2wiS/ 21dVzZ8+Heve3LV43a+/p8S47DJtBFWhwV0TpPTuJlauOwx2n2+gP66S0g+WRxuqZPS0 VjnIMxO8ppQ9K21APbSLFLrusR6l6T350W1gUVW1w2AyDjg59MkVmTNtkfivAt41AfRL PSASFGMZQ4eEk1Z2p7xJ9ciD+84okt8tmuUM5s2W+nH3Cc4ZFxBEDUra3c/XmVRZWZKD ur+Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=Rpvv8QTlCvX0ce4P9NdbIIZUZ16fQDB1rK9Grm+aNvc=; b=thB2bNtI6UDbwpTFQJVd6aTalvhgPIRQyrPHvlwjp3ULHBuLXsFP7cet1cvXrBRYf9 WTUzzLZqwwDvqSFz9v3OM3CfufqyVhmDSZoO/AgVrikAjLrIRK7VktatY3/+NlxEayOq GiFgXON5Z+tfR3cemj3Iv9XPXDPo4JVbeaJRMn9S6r2+Kb/poSBxnJ2b785vt2XcjbQ1 111fMkZ0kWaMBO0T5hhebFRsXP2AJP140tLY6vbwh9Ogm6KlQyq/jzN7VVcLTiLwtfac NGQg7GSI2faCP0uWUN0d1YnbBSIO9ZOXBDYQi6oiW9kaoSSkPaduvpZ+nJqd6lmJ/mmJ bl2Q== X-Gm-Message-State: AFqh2koc5IHXKcbuTu63/TZlvyhRAULa2sGPAU8BuB6CKaeK7VU2okRE QIH3A+4dwSePGMDk1PpBR+QJ29US9rU= X-Google-Smtp-Source: AMrXdXul+s7qU27iC9wdmHBDpy21JM9B3Qg8B8hfxBVH1YgYGj0pYORd4JpoV2ZIreNWVlg7X0b/PZ4TpZM= X-Received: from badhri.mtv.corp.google.com ([2620:15c:211:201:d726:232e:7cc0:6434]) (user=badhri job=sendgmr) by 2002:a5b:44a:0:b0:71e:d3d1:953 with SMTP id s10-20020a5b044a000000b0071ed3d10953mr11141691ybp.214.1673688212135; Sat, 14 Jan 2023 01:23:32 -0800 (PST) Date: Sat, 14 Jan 2023 01:23:26 -0800 Mime-Version: 1.0 X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20230114092328.1907406-1-badhri@google.com> Subject: [PATCH v12 1/3] usb: typec: tcpm: Add callbacks to mitigate wakeups due to contaminant From: Badhri Jagan Sridharan To: Guenter Roeck , Heikki Krogerus , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Kyle Tso , Badhri Jagan Sridharan Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On some of the TCPC implementations, when the Type-C port is exposed to contaminants, such as water, TCPC stops toggling while reporting OPEN either by the time TCPM reads CC pin status or during CC debounce window. This causes TCPM to be stuck in TOGGLING state. If TCPM is made to restart toggling, the behavior recurs causing redundant CPU wakeups till the USB-C port is free of contaminant. [206199.287817] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected] [206199.640337] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected] [206199.985789] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected] (or) [ 7853.867577] Start toggling [ 7853.889921] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected] [ 7855.698765] CC1: 0 -> 0, CC2: 0 -> 5 [state TOGGLING, polarity 0, connected] [ 7855.698790] state change TOGGLING -> SNK_ATTACH_WAIT [rev3 NONE_AMS] [ 7855.698826] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev3 NONE_AMS] [ 7855.703559] CC1: 0 -> 0, CC2: 5 -> 5 [state SNK_ATTACH_WAIT, polarity 0, connected] [ 7855.856555] CC1: 0 -> 0, CC2: 5 -> 0 [state SNK_ATTACH_WAIT, polarity 0, disconnected] [ 7855.856581] state change SNK_ATTACH_WAIT -> SNK_ATTACH_WAIT [rev3 NONE_AMS] [ 7855.856613] pending state change SNK_ATTACH_WAIT -> SNK_UNATTACHED @ 170 ms [rev3 NONE_AMS] [ 7856.027744] state change SNK_ATTACH_WAIT -> SNK_UNATTACHED [delayed 170 ms] [ 7856.181949] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected] [ 7856.187896] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected] [ 7857.645630] CC1: 0 -> 0, CC2: 0 -> 0 [state TOGGLING, polarity 0, disconnected] [ 7857.647291] CC1: 0 -> 0, CC2: 0 -> 5 [state TOGGLING, polarity 0, connected] [ 7857.647298] state change TOGGLING -> SNK_ATTACH_WAIT [rev3 NONE_AMS] [ 7857.647310] pending state change SNK_ATTACH_WAIT -> SNK_DEBOUNCED @ 170 ms [rev3 NONE_AMS] [ 7857.808106] CC1: 0 -> 0, CC2: 5 -> 0 [state SNK_ATTACH_WAIT, polarity 0, disconnected] [ 7857.808123] state change SNK_ATTACH_WAIT -> SNK_ATTACH_WAIT [rev3 NONE_AMS] [ 7857.808150] pending state change SNK_ATTACH_WAIT -> SNK_UNATTACHED @ 170 ms [rev3 NONE_AMS] [ 7857.978727] state change SNK_ATTACH_WAIT -> SNK_UNATTACHED [delayed 170 ms] To mitigate redundant TCPM wakeups, TCPCs which do have the needed hardware can implement the check_contaminant callback which is invoked by TCPM to evaluate for presence of contaminant. Lower level TCPC driver can restart toggling through TCPM_PORT_CLEAN event when the driver detects that USB-C port is free of contaminant. check_contaminant callback also passes the disconnect_while_debounce flag which when true denotes that the CC pins transitioned to OPEN state during the CC debounce window. Signed-off-by: Badhri Jagan Sridharan --- Changes since v11: * None. Changes since v10: * Fall back to default state if enabling toggling fails when * exiting CHECK_CONTAMINANT state Changes since v9: * Invoke tcpm_start_toggling before transitioning to TOGGLING from * CHECK_CONTAMINANT. Changes since v7: * None. Skipped versions by mistake. Changes since v6: * folded the debounce logic into tcpm state machine and removed tcpm * state export. * Added a helper to determine whether the port is in toggling state. * Excluded CHECK_CONTAMINANT from tcpm_log. Changes since v5: * Updated commit message. Removed change id. Changes since v4: * None Changes since v3: * None Changes since V2: * Offloaded tcpm from maintaining disconnect_while_debouncing logic * to lower level maxim tcpc driver based on feedback. --- drivers/usb/typec/tcpm/tcpm.c | 55 ++++++++++++++++++++++++++++++++++- include/linux/usb/tcpm.h | 8 +++++ 2 files changed, 62 insertions(+), 1 deletion(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 904c7b4ce2f0..c624747f32df 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -36,6 +36,7 @@ #define FOREACH_STATE(S) \ S(INVALID_STATE), \ S(TOGGLING), \ + S(CHECK_CONTAMINANT), \ S(SRC_UNATTACHED), \ S(SRC_ATTACH_WAIT), \ S(SRC_ATTACHED), \ @@ -249,6 +250,7 @@ enum frs_typec_current { #define TCPM_RESET_EVENT BIT(2) #define TCPM_FRS_EVENT BIT(3) #define TCPM_SOURCING_VBUS BIT(4) +#define TCPM_PORT_CLEAN BIT(5) #define LOG_BUFFER_ENTRIES 1024 #define LOG_BUFFER_ENTRY_SIZE 128 @@ -483,6 +485,13 @@ struct tcpm_port { * SNK_READY for non-pd link. */ bool slow_charger_loop; + + /* + * When true indicates that the lower level drivers indicate potential presence + * of contaminant in the connector pins based on the tcpm state machine + * transitions. + */ + bool potential_contaminant; #ifdef CONFIG_DEBUG_FS struct dentry *dentry; struct mutex logbuffer_lock; /* log buffer access lock */ @@ -647,7 +656,7 @@ 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 == TOGGLING)) + port->state == TOGGLING || port->state == CHECK_CONTAMINANT)) return; va_start(args, fmt); @@ -3904,15 +3913,28 @@ static void run_state_machine(struct tcpm_port *port) unsigned int msecs; enum tcpm_state upcoming_state; + if (port->tcpc->check_contaminant && port->state != CHECK_CONTAMINANT) + port->potential_contaminant = ((port->enter_state == SRC_ATTACH_WAIT && + port->state == SRC_UNATTACHED) || + (port->enter_state == SNK_ATTACH_WAIT && + port->state == SNK_UNATTACHED)); + port->enter_state = port->state; switch (port->state) { case TOGGLING: break; + case CHECK_CONTAMINANT: + port->tcpc->check_contaminant(port->tcpc); + break; /* SRC states */ case SRC_UNATTACHED: if (!port->non_pd_role_swap) tcpm_swap_complete(port, -ENOTCONN); tcpm_src_detach(port); + if (port->potential_contaminant) { + tcpm_set_state(port, CHECK_CONTAMINANT, 0); + break; + } if (tcpm_start_toggling(port, tcpm_rp_cc(port))) { tcpm_set_state(port, TOGGLING, 0); break; @@ -4150,6 +4172,10 @@ static void run_state_machine(struct tcpm_port *port) tcpm_swap_complete(port, -ENOTCONN); tcpm_pps_complete(port, -ENOTCONN); tcpm_snk_detach(port); + if (port->potential_contaminant) { + tcpm_set_state(port, CHECK_CONTAMINANT, 0); + break; + } if (tcpm_start_toggling(port, TYPEC_CC_RD)) { tcpm_set_state(port, TOGGLING, 0); break; @@ -4926,6 +4952,9 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1, else if (tcpm_port_is_sink(port)) tcpm_set_state(port, SNK_ATTACH_WAIT, 0); break; + case CHECK_CONTAMINANT: + /* Wait for Toggling to be resumed */ + break; case SRC_UNATTACHED: case ACC_UNATTACHED: if (tcpm_port_is_debug(port) || tcpm_port_is_audio(port) || @@ -5425,6 +5454,15 @@ static void tcpm_pd_event_handler(struct kthread_work *work) port->vbus_source = true; _tcpm_pd_vbus_on(port); } + if (events & TCPM_PORT_CLEAN) { + tcpm_log(port, "port clean"); + if (port->state == CHECK_CONTAMINANT) { + if (tcpm_start_toggling(port, tcpm_rp_cc(port))) + tcpm_set_state(port, TOGGLING, 0); + else + tcpm_set_state(port, tcpm_default_state(port), 0); + } + } spin_lock(&port->pd_event_lock); } @@ -5477,6 +5515,21 @@ void tcpm_sourcing_vbus(struct tcpm_port *port) } EXPORT_SYMBOL_GPL(tcpm_sourcing_vbus); +void tcpm_port_clean(struct tcpm_port *port) +{ + spin_lock(&port->pd_event_lock); + port->pd_events |= TCPM_PORT_CLEAN; + spin_unlock(&port->pd_event_lock); + kthread_queue_work(port->wq, &port->event_work); +} +EXPORT_SYMBOL_GPL(tcpm_port_clean); + +bool tcpm_port_is_toggling(struct tcpm_port *port) +{ + return port->port_type == TYPEC_PORT_DRP && port->state == TOGGLING; +} +EXPORT_SYMBOL_GPL(tcpm_port_is_toggling); + static void tcpm_enable_frs_work(struct kthread_work *work) { struct tcpm_port *port = container_of(work, struct tcpm_port, enable_frs); diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h index bffc8d3e14ad..ab7ca872950b 100644 --- a/include/linux/usb/tcpm.h +++ b/include/linux/usb/tcpm.h @@ -114,6 +114,11 @@ enum tcpm_transmit_type { * Optional; The USB Communications Capable bit indicates if port * partner is capable of communication over the USB data lines * (e.g. D+/- or SS Tx/Rx). Called to notify the status of the bit. + * @check_contaminant: + * Optional; The callback is called when CC pins report open status + * at the end of the deboumce period or when the port is still + * toggling. Chip level drivers are expected to check for contaminant + * and call tcpm_clean_port when the port is clean. */ struct tcpc_dev { struct fwnode_handle *fwnode; @@ -148,6 +153,7 @@ struct tcpc_dev { bool pps_active, u32 requested_vbus_voltage); bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev); void (*set_partner_usb_comm_capable)(struct tcpc_dev *dev, bool enable); + void (*check_contaminant)(struct tcpc_dev *dev); }; struct tcpm_port; @@ -165,5 +171,7 @@ void tcpm_pd_transmit_complete(struct tcpm_port *port, enum tcpm_transmit_status status); void tcpm_pd_hard_reset(struct tcpm_port *port); void tcpm_tcpc_reset(struct tcpm_port *port); +void tcpm_port_clean(struct tcpm_port *port); +bool tcpm_port_is_toggling(struct tcpm_port *port); #endif /* __LINUX_USB_TCPM_H */ From patchwork Sat Jan 14 09:23:27 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Badhri Jagan Sridharan X-Patchwork-Id: 642911 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0C044C3DA78 for ; Sat, 14 Jan 2023 09:23:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229726AbjANJXi (ORCPT ); Sat, 14 Jan 2023 04:23:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229925AbjANJXg (ORCPT ); Sat, 14 Jan 2023 04:23:36 -0500 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 034B05BA2 for ; Sat, 14 Jan 2023 01:23:35 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id z9-20020a25ba49000000b007d4416e3667so986182ybj.23 for ; Sat, 14 Jan 2023 01:23:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=W2U/x+KRdCN6it3HlCS5RsRS3YSvRa1PfTbg1xgKGHs=; b=HMqRbjyf9FNteENmFFL3Kz2KHCesjEzxHU/+oj+EmqNjOMk2TRqlgMrNDlBWt60ZDh Rpvj/2E5oXk57+GnFnDbWFP2omGuuMjnnY4YAHM1arj4flDEJGBOnb0/UcuApt2PboxR JgYa9tmwg3RuaDuAdI/8q28rDHjFDuQco53HeBHq0Fb0hINd6YJf8YgEYE39wBN8+LQV CzSt8uR0MlKPlyqtLDUG4oqyEaxEGAtgWI0yvHzEzfkvWX3AdxFupZXjXGmTvSPot/eP JkSNazU67fAlXb4PntFhbCpiwkSAa7dUSS0jIyG0nxmIUz1xfke6tTkzfYFmpnEgow+9 fFJQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=W2U/x+KRdCN6it3HlCS5RsRS3YSvRa1PfTbg1xgKGHs=; b=ZCXFi9Lhhm12qK/Ktq8vQ+pqhvNHpkFsSKFaQaLIsnjW5+vF8gLOF4XqohggE7prMB 7yxF2WzI0L+U5Lzkq1Ot9lTko4FHw6zzl+tTIUHj+E6oi1xsqFhOROWvD8PO+oXjTdpJ 85lbxsB8PjbSQlFRDrvTGLp2qNysn+TpQzRFcLwRV/9wxxCxpKsGagM34+iwjcC9hwul 66qf8o2vFULlRxTHbPWlRswYbdtuM9RjjtZDvCkPiarQq1JaGvHiSvpeM3K1DiMBfXK9 4z3yfo/Ckq8Io6+cXBsNa/sWBWOY/maoUZA1v4GkFxYCOx93dBCBUeCV0DIX/L1bAK0+ PLYQ== X-Gm-Message-State: AFqh2koV50DlTBSa00Qt48Rz83Q98GOiwTInkObSl775fkJiNk1gy1/U 9dD6w7xy3X7qBrmhisYZdiem54LurgA= X-Google-Smtp-Source: AMrXdXsOKri/ygrZN2zncVRQ5HkPN4TJ+/MeWyENrYm/6eEG9jF1wqk9ZAtbLJD6IC/aNs/yWCjy1P8oQSo= X-Received: from badhri.mtv.corp.google.com ([2620:15c:211:201:d726:232e:7cc0:6434]) (user=badhri job=sendgmr) by 2002:a81:4ed8:0:b0:3b5:1538:c19 with SMTP id c207-20020a814ed8000000b003b515380c19mr3525599ywb.210.1673688214260; Sat, 14 Jan 2023 01:23:34 -0800 (PST) Date: Sat, 14 Jan 2023 01:23:27 -0800 In-Reply-To: <20230114092328.1907406-1-badhri@google.com> Mime-Version: 1.0 References: <20230114092328.1907406-1-badhri@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20230114092328.1907406-2-badhri@google.com> Subject: [PATCH v12 2/3] usb: typec: tcpci: Add callback for evaluating contaminant presence From: Badhri Jagan Sridharan To: Guenter Roeck , Heikki Krogerus , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Kyle Tso , Badhri Jagan Sridharan Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org This change adds callback to evaluate presence of contaminant in the TCPCI layer. Signed-off-by: Badhri Jagan Sridharan --- Changes since v11: * None Changes since v10: * None Changes since v9: * Check for presence of low level check_contaminant before installing tcpc.check_contaminant. Changes since v7: * None. Skipped versions by mistake. Changes since v6: * Removed is_potential_contaminant callback Changes since v5: * None Changes since v4: * None Changes since v3: * None Changes since v2: * Added tcpci_is_potential_contaminant to offload * disconnect_while_debounce logic --- drivers/usb/typec/tcpm/tcpci.c | 11 +++++++++++ include/linux/usb/tcpci.h | 7 +++++++ 2 files changed, 18 insertions(+) diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c index fe781a38dc82..699539e1be06 100644 --- a/drivers/usb/typec/tcpm/tcpci.c +++ b/drivers/usb/typec/tcpm/tcpci.c @@ -403,6 +403,14 @@ static void tcpci_frs_sourcing_vbus(struct tcpc_dev *dev) tcpci->data->frs_sourcing_vbus(tcpci, tcpci->data); } +static void tcpci_check_contaminant(struct tcpc_dev *dev) +{ + struct tcpci *tcpci = tcpc_to_tcpci(dev); + + if (tcpci->data->check_contaminant) + tcpci->data->check_contaminant(tcpci, tcpci->data); +} + static int tcpci_set_bist_data(struct tcpc_dev *tcpc, bool enable) { struct tcpci *tcpci = tcpc_to_tcpci(tcpc); @@ -778,6 +786,9 @@ struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data) tcpci->tcpc.frs_sourcing_vbus = tcpci_frs_sourcing_vbus; tcpci->tcpc.set_partner_usb_comm_capable = tcpci_set_partner_usb_comm_capable; + if (tcpci->data->check_contaminant) + tcpci->tcpc.check_contaminant = tcpci_check_contaminant; + if (tcpci->data->auto_discharge_disconnect) { tcpci->tcpc.enable_auto_vbus_discharge = tcpci_enable_auto_vbus_discharge; tcpci->tcpc.set_auto_vbus_discharge_threshold = diff --git a/include/linux/usb/tcpci.h b/include/linux/usb/tcpci.h index 17657451c762..85e95a3251d3 100644 --- a/include/linux/usb/tcpci.h +++ b/include/linux/usb/tcpci.h @@ -188,6 +188,12 @@ struct tcpci; * Optional; The USB Communications Capable bit indicates if port * partner is capable of communication over the USB data lines * (e.g. D+/- or SS Tx/Rx). Called to notify the status of the bit. + * @check_contaminant: + * Optional; The callback is invoked when chiplevel drivers indicated + * that the USB port needs to be checked for contaminant presence. + * Chip level drivers are expected to check for contaminant and call + * tcpm_clean_port when the port is clean to put the port back into + * toggling state. */ struct tcpci_data { struct regmap *regmap; @@ -204,6 +210,7 @@ struct tcpci_data { void (*frs_sourcing_vbus)(struct tcpci *tcpci, struct tcpci_data *data); void (*set_partner_usb_comm_capable)(struct tcpci *tcpci, struct tcpci_data *data, bool capable); + void (*check_contaminant)(struct tcpci *tcpci, struct tcpci_data *data); }; struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data); From patchwork Sat Jan 14 09:23:28 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Badhri Jagan Sridharan X-Patchwork-Id: 643090 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id A64AFC3DA78 for ; Sat, 14 Jan 2023 09:23:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229519AbjANJXl (ORCPT ); Sat, 14 Jan 2023 04:23:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50398 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229917AbjANJXj (ORCPT ); Sat, 14 Jan 2023 04:23:39 -0500 Received: from mail-yw1-x114a.google.com (mail-yw1-x114a.google.com [IPv6:2607:f8b0:4864:20::114a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 161725BA2 for ; Sat, 14 Jan 2023 01:23:37 -0800 (PST) Received: by mail-yw1-x114a.google.com with SMTP id 00721157ae682-4c57d19de6fso226313587b3.20 for ; Sat, 14 Jan 2023 01:23:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=ei0KEmr/pKyqDjgt/2tUbMYVe7xBK2vq6J3AhfH4/lE=; b=POCfNqSQSUfSJX1xCIYCggL7jLzerSFDsC0bLVW5rsW/TNHXLJIxwugDxU5cRJcPZM 02i3oFJIuQfkKYM5p9SpBLhCTLf7FJz4yBAM/6+ucegopPHvuwy4gBhY7EXjAJG++caF A5dzNAxST53ocRoMJJ9au3ZrF05gz8ep3Dh4X6rkU5PWwyOuCpyXV9hOui3puWmyKgHY /ZHK9RkvJO5doIMWWqraDfa6H1WEZ21OXE5mLWPR33/couTCirxmiZEl+sk79SmP7uPR 8GSd9IeAebs8DlWMz6m2nGc+VUweWNuVU/z7X+b4P82Ho/PBoECVtJj1oroLEs9z5mGH GHlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ei0KEmr/pKyqDjgt/2tUbMYVe7xBK2vq6J3AhfH4/lE=; b=uB8ac1FNrhs+APWfq64avBuenJfFnvWGsWeEc/39cUYSR4M7FceI4f3WcMqftjQbuF 36/PIR3KFj2t3kVqKSjymQrMTu8TZXEA0x365PYhqv3uUnztNuo2AiDy3atScNBhWMyU Ue3HCUv1OweGNXXduAohatpT5Jh9lNXgG/Lm9nJAvoIjxgQIsCHMtpAgpcEcz5vN9yHZ 0p/FkClgXIW5QJJ3D3y+7hYugA65pStD3Oqz+DK9Wsx+uGNUBlmBiHcZaDHPmgUX0F1a 4VMbxcOzaocRr/6YVeJoIzXuDlasW1FVZ7vdJuTBp6nwJYYbiLc4qsW0G2phtsfGKoTJ 2QIA== X-Gm-Message-State: AFqh2krdaQwrJvAZCC0kTtF9Y3Aal1gssNSql9bVV/Qpa/hOTdBBSTRK njaonWieWmFceORg1zU2aVhXh76VgLA= X-Google-Smtp-Source: AMrXdXt1hFhC+21okRwat3P2dZM+lP+MQhn/VYoLAImRUR3uqNpZvh187SRUFAiZSKrhnTDagOV8VOuNXDw= X-Received: from badhri.mtv.corp.google.com ([2620:15c:211:201:d726:232e:7cc0:6434]) (user=badhri job=sendgmr) by 2002:a0d:d996:0:b0:48c:9ce1:9ac8 with SMTP id b144-20020a0dd996000000b0048c9ce19ac8mr726984ywe.305.1673688216390; Sat, 14 Jan 2023 01:23:36 -0800 (PST) Date: Sat, 14 Jan 2023 01:23:28 -0800 In-Reply-To: <20230114092328.1907406-1-badhri@google.com> Mime-Version: 1.0 References: <20230114092328.1907406-1-badhri@google.com> X-Mailer: git-send-email 2.39.0.314.g84b9a713c41-goog Message-ID: <20230114092328.1907406-3-badhri@google.com> Subject: [PATCH v12 3/3] usb: typec: maxim_contaminant: Implement check_contaminant callback From: Badhri Jagan Sridharan To: Guenter Roeck , Heikki Krogerus , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Kyle Tso , Badhri Jagan Sridharan Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Maxim TCPC has additional ADCs and low current(1ua) current source to measure the impedance of CC and SBU pins. When tcpm invokes the check_contaminant callback, Maxim TCPC measures the impedance of the CC & SBU pins and when the impedance measured is less than 1MOhm, it is assumed that USB-C port is contaminated. CC comparators are also checked to differentiate between presence of sink and contaminant. Once USB-C is deemed to be contaminated, MAXIM TCPC has additional hardware to disable normal DRP toggling cycle and enable 1ua on CC pins once every 2.4secs/4.8secs. Maxim TCPC interrupts AP once the impedance on the CC pin is above the 1MOhm threshold. The Maxim tcpc driver then signals TCPM_PORT_CLEAN to restart toggling. Renaming tcpci_maxim.c to tcpci_maxim_core.c and moving reg read/write helper functions to the tcpci_maxim.h header file. Signed-off-by: Badhri Jagan Sridharan --- Changes since v11: * Fixed missing error handling. Changes since v10: * none Changes since v9: * None. Changes since V7: * None. Skipped versions by mistake. Changes since v6: * Refactored logic for check_contaminant and removed * is_potential_contaminant. Changes since v5: * None Changes since v4: * Missed committing local changes to fix ktest robot warnings. Updated the patch in v5. Changes since v3: * Renamed functions and removed the unecessary EXPORT. * Fixed ktest robot warning. Changes since v2: * Implemented is_potential_contaminant to offload * disconnect_while_debouncing Changes since v1: * Renamed tcpci_maxim.c to tcpci_maxim_core.c and compiling tcpci_maxim_core.o with maxim_contaminant.o as a single module as suggested by Guenter Roeck * Got rid of exporting symbols for reg read/write helper functions and moved them to header as suggested by Heikki Krogerus * Sqashed the commit which exposed the max_tcpci_read helper functions into this one. --- drivers/usb/typec/tcpm/Makefile | 1 + drivers/usb/typec/tcpm/maxim_contaminant.c | 387 ++++++++++++++++++ drivers/usb/typec/tcpm/tcpci_maxim.h | 89 ++++ .../{tcpci_maxim.c => tcpci_maxim_core.c} | 53 +-- 4 files changed, 498 insertions(+), 32 deletions(-) create mode 100644 drivers/usb/typec/tcpm/maxim_contaminant.c create mode 100644 drivers/usb/typec/tcpm/tcpci_maxim.h rename drivers/usb/typec/tcpm/{tcpci_maxim.c => tcpci_maxim_core.c} (93%) diff --git a/drivers/usb/typec/tcpm/Makefile b/drivers/usb/typec/tcpm/Makefile index 906d9dced8e7..08e57bb499cb 100644 --- a/drivers/usb/typec/tcpm/Makefile +++ b/drivers/usb/typec/tcpm/Makefile @@ -8,3 +8,4 @@ obj-$(CONFIG_TYPEC_RT1711H) += tcpci_rt1711h.o obj-$(CONFIG_TYPEC_MT6360) += tcpci_mt6360.o obj-$(CONFIG_TYPEC_TCPCI_MT6370) += tcpci_mt6370.o obj-$(CONFIG_TYPEC_TCPCI_MAXIM) += tcpci_maxim.o +tcpci_maxim-y += tcpci_maxim_core.o maxim_contaminant.o diff --git a/drivers/usb/typec/tcpm/maxim_contaminant.c b/drivers/usb/typec/tcpm/maxim_contaminant.c new file mode 100644 index 000000000000..1c4ce9861112 --- /dev/null +++ b/drivers/usb/typec/tcpm/maxim_contaminant.c @@ -0,0 +1,387 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright 2022 Google, Inc + * + * USB-C module to reduce wakeups due to contaminants. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include "tcpci_maxim.h" + +enum fladc_select { + CC1_SCALE1 = 1, + CC1_SCALE2, + CC2_SCALE1, + CC2_SCALE2, + SBU1, + SBU2, +}; + +#define FLADC_1uA_LSB_MV 25 +/* High range CC */ +#define FLADC_CC_HIGH_RANGE_LSB_MV 208 +/* Low range CC */ +#define FLADC_CC_LOW_RANGE_LSB_MV 126 + +/* 1uA current source */ +#define FLADC_CC_SCALE1 1 +/* 5 uA current source */ +#define FLADC_CC_SCALE2 5 + +#define FLADC_1uA_CC_OFFSET_MV 300 +#define FLADC_CC_HIGH_RANGE_OFFSET_MV 624 +#define FLADC_CC_LOW_RANGE_OFFSET_MV 378 + +#define CONTAMINANT_THRESHOLD_SBU_K 1000 +#define CONTAMINANT_THRESHOLD_CC_K 1000 + +#define READ1_SLEEP_MS 10 +#define READ2_SLEEP_MS 5 + +#define STATUS_CHECK(reg, mask, val) (((reg) & (mask)) == (val)) + +#define IS_CC_OPEN(cc_status) \ + (STATUS_CHECK((cc_status), TCPC_CC_STATUS_CC1_MASK << TCPC_CC_STATUS_CC1_SHIFT, \ + TCPC_CC_STATE_SRC_OPEN) && STATUS_CHECK((cc_status), \ + TCPC_CC_STATUS_CC2_MASK << \ + TCPC_CC_STATUS_CC2_SHIFT, \ + TCPC_CC_STATE_SRC_OPEN)) + +static int max_contaminant_adc_to_mv(struct max_tcpci_chip *chip, enum fladc_select channel, + bool ua_src, u8 fladc) +{ + /* SBU channels only have 1 scale with 1uA. */ + if ((ua_src && (channel == CC1_SCALE2 || channel == CC2_SCALE2 || channel == SBU1 || + channel == SBU2))) + /* Mean of range */ + return FLADC_1uA_CC_OFFSET_MV + (fladc * FLADC_1uA_LSB_MV); + else if (!ua_src && (channel == CC1_SCALE1 || channel == CC2_SCALE1)) + return FLADC_CC_HIGH_RANGE_OFFSET_MV + (fladc * FLADC_CC_HIGH_RANGE_LSB_MV); + else if (!ua_src && (channel == CC1_SCALE2 || channel == CC2_SCALE2)) + return FLADC_CC_LOW_RANGE_OFFSET_MV + (fladc * FLADC_CC_LOW_RANGE_LSB_MV); + + dev_err(chip->dev, "ADC ERROR: SCALE UNKNOWN"); + + return -EINVAL; +} + +static int max_contaminant_read_adc_mv(struct max_tcpci_chip *chip, enum fladc_select channel, + int sleep_msec, bool raw, bool ua_src) +{ + struct regmap *regmap = chip->data.regmap; + u8 fladc; + int ret; + + /* Channel & scale select */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_ADC_CTRL1, ADCINSEL_MASK, + channel << ADC_CHANNEL_OFFSET); + if (ret < 0) + return ret; + + /* Enable ADC */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_ADC_CTRL1, ADCEN, ADCEN); + if (ret < 0) + return ret; + + usleep_range(sleep_msec * 1000, (sleep_msec + 1) * 1000); + ret = max_tcpci_read8(chip, TCPC_VENDOR_FLADC_STATUS, &fladc); + if (ret < 0) + return ret; + + /* Disable ADC */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_ADC_CTRL1, ADCEN, 0); + if (ret < 0) + return ret; + + ret = regmap_update_bits(regmap, TCPC_VENDOR_ADC_CTRL1, ADCINSEL_MASK, 0); + if (ret < 0) + return ret; + + if (!raw) + return max_contaminant_adc_to_mv(chip, channel, ua_src, fladc); + else + return fladc; +} + +static int max_contaminant_read_resistance_kohm(struct max_tcpci_chip *chip, + enum fladc_select channel, int sleep_msec, bool raw) +{ + struct regmap *regmap = chip->data.regmap; + int mv; + int ret; + + if (channel == CC1_SCALE1 || channel == CC2_SCALE1 || channel == CC1_SCALE2 || + channel == CC2_SCALE2) { + /* Enable 1uA current source */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, CCLPMODESEL_MASK, + ULTRA_LOW_POWER_MODE); + if (ret < 0) + return ret; + + /* Enable 1uA current source */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, CCRPCTRL_MASK, UA_1_SRC); + if (ret < 0) + return ret; + + /* OVP disable */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, CCOVPDIS, CCOVPDIS); + if (ret < 0) + return ret; + + mv = max_contaminant_read_adc_mv(chip, channel, sleep_msec, raw, true); + if (mv < 0) + return ret; + + /* OVP enable */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, CCOVPDIS, 0); + if (ret < 0) + return ret; + /* returns KOhm as 1uA source is used. */ + return mv; + } + + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, SBUOVPDIS, SBUOVPDIS); + if (ret < 0) + return ret; + + /* SBU switches auto configure when channel is selected. */ + /* Enable 1ua current source */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, SBURPCTRL, SBURPCTRL); + if (ret < 0) + return ret; + + mv = max_contaminant_read_adc_mv(chip, channel, sleep_msec, raw, true); + if (mv < 0) + return ret; + /* Disable current source */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, SBURPCTRL, 0); + if (ret < 0) + return ret; + + /* OVP disable */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, SBUOVPDIS, 0); + if (ret < 0) + return ret; + + return mv; +} + +static int max_contaminant_read_comparators(struct max_tcpci_chip *chip, u8 *vendor_cc_status2_cc1, + u8 *vendor_cc_status2_cc2) +{ + struct regmap *regmap = chip->data.regmap; + int ret; + + /* Enable 80uA source */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, CCRPCTRL_MASK, UA_80_SRC); + if (ret < 0) + return ret; + + /* Enable comparators */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL1, CCCOMPEN, CCCOMPEN); + if (ret < 0) + return ret; + + /* Sleep to allow comparators settle */ + usleep_range(5000, 6000); + ret = regmap_update_bits(regmap, TCPC_TCPC_CTRL, TCPC_TCPC_CTRL_ORIENTATION, PLUG_ORNT_CC1); + if (ret < 0) + return ret; + + usleep_range(5000, 6000); + ret = max_tcpci_read8(chip, VENDOR_CC_STATUS2, vendor_cc_status2_cc1); + if (ret < 0) + return ret; + + ret = regmap_update_bits(regmap, TCPC_TCPC_CTRL, TCPC_TCPC_CTRL_ORIENTATION, PLUG_ORNT_CC2); + if (ret < 0) + return ret; + + usleep_range(5000, 6000); + ret = max_tcpci_read8(chip, VENDOR_CC_STATUS2, vendor_cc_status2_cc2); + if (ret < 0) + return ret; + + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL1, CCCOMPEN, 0); + if (ret < 0) + return ret; + + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, CCRPCTRL_MASK, 0); + if (ret < 0) + return ret; + + return 0; +} + +static int max_contaminant_detect_contaminant(struct max_tcpci_chip *chip) +{ + int cc1_k, cc2_k, sbu1_k, sbu2_k, ret; + u8 vendor_cc_status2_cc1 = 0xff, vendor_cc_status2_cc2 = 0xff; + u8 role_ctrl = 0, role_ctrl_backup = 0; + int inferred_state = NOT_DETECTED; + + ret = max_tcpci_read8(chip, TCPC_ROLE_CTRL, &role_ctrl); + if (ret < 0) + return NOT_DETECTED; + + role_ctrl_backup = role_ctrl; + role_ctrl = 0x0F; + ret = max_tcpci_write8(chip, TCPC_ROLE_CTRL, role_ctrl); + if (ret < 0) + return NOT_DETECTED; + + cc1_k = max_contaminant_read_resistance_kohm(chip, CC1_SCALE2, READ1_SLEEP_MS, false); + if (cc1_k < 0) + goto exit; + + cc2_k = max_contaminant_read_resistance_kohm(chip, CC2_SCALE2, READ2_SLEEP_MS, false); + if (cc2_k < 0) + goto exit; + + sbu1_k = max_contaminant_read_resistance_kohm(chip, SBU1, READ1_SLEEP_MS, false); + if (sbu1_k < 0) + goto exit; + + sbu2_k = max_contaminant_read_resistance_kohm(chip, SBU2, READ2_SLEEP_MS, false); + if (sbu2_k < 0) + goto exit; + + ret = max_contaminant_read_comparators(chip, &vendor_cc_status2_cc1, + &vendor_cc_status2_cc2); + + if (ret < 0) + goto exit; + + if ((!(CC1_VUFP_RD0P5 & vendor_cc_status2_cc1) || + !(CC2_VUFP_RD0P5 & vendor_cc_status2_cc2)) && + !(CC1_VUFP_RD0P5 & vendor_cc_status2_cc1 && CC2_VUFP_RD0P5 & vendor_cc_status2_cc2)) + inferred_state = SINK; + else if ((cc1_k < CONTAMINANT_THRESHOLD_CC_K || cc2_k < CONTAMINANT_THRESHOLD_CC_K) && + (sbu1_k < CONTAMINANT_THRESHOLD_SBU_K || sbu2_k < CONTAMINANT_THRESHOLD_SBU_K)) + inferred_state = DETECTED; + + if (inferred_state == NOT_DETECTED) + max_tcpci_write8(chip, TCPC_ROLE_CTRL, role_ctrl_backup); + else + max_tcpci_write8(chip, TCPC_ROLE_CTRL, (TCPC_ROLE_CTRL_DRP | 0xA)); + + return inferred_state; +exit: + max_tcpci_write8(chip, TCPC_ROLE_CTRL, role_ctrl_backup); + return NOT_DETECTED; +} + +static int max_contaminant_enable_dry_detection(struct max_tcpci_chip *chip) +{ + struct regmap *regmap = chip->data.regmap; + u8 temp; + int ret; + + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL3, CCWTRDEB_MASK | CCWTRSEL_MASK + | WTRCYCLE_MASK, CCWTRDEB_1MS << CCWTRDEB_SHIFT | + CCWTRSEL_1V << CCWTRSEL_SHIFT | WTRCYCLE_4_8_S << + WTRCYCLE_SHIFT); + if (ret < 0) + return ret; + + ret = regmap_update_bits(regmap, TCPC_ROLE_CTRL, TCPC_ROLE_CTRL_DRP, TCPC_ROLE_CTRL_DRP); + if (ret < 0) + return ret; + + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL1, CCCONNDRY, CCCONNDRY); + if (ret < 0) + return ret; + ret = max_tcpci_read8(chip, TCPC_VENDOR_CC_CTRL1, &temp); + if (ret < 0) + return ret; + + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, CCLPMODESEL_MASK, + ULTRA_LOW_POWER_MODE); + if (ret < 0) + return ret; + ret = max_tcpci_read8(chip, TCPC_VENDOR_CC_CTRL2, &temp); + if (ret < 0) + return ret; + + /* Enable Look4Connection before sending the command */ + ret = regmap_update_bits(regmap, TCPC_TCPC_CTRL, TCPC_TCPC_CTRL_EN_LK4CONN_ALRT, + TCPC_TCPC_CTRL_EN_LK4CONN_ALRT); + if (ret < 0) + return ret; + + ret = max_tcpci_write8(chip, TCPC_COMMAND, TCPC_CMD_LOOK4CONNECTION); + if (ret < 0) + return ret; + return 0; +} + +bool max_contaminant_is_contaminant(struct max_tcpci_chip *chip, bool disconnect_while_debounce) +{ + u8 cc_status, pwr_cntl; + int ret; + + ret = max_tcpci_read8(chip, TCPC_CC_STATUS, &cc_status); + if (ret < 0) + return false; + + ret = max_tcpci_read8(chip, TCPC_POWER_CTRL, &pwr_cntl); + if (ret < 0) + return false; + + if (chip->contaminant_state == NOT_DETECTED || chip->contaminant_state == SINK) { + if (!disconnect_while_debounce) + msleep(100); + + ret = max_tcpci_read8(chip, TCPC_CC_STATUS, &cc_status); + if (ret < 0) + return false; + + if (IS_CC_OPEN(cc_status)) { + u8 role_ctrl, role_ctrl_backup; + + ret = max_tcpci_read8(chip, TCPC_ROLE_CTRL, &role_ctrl); + if (ret < 0) + return false; + + role_ctrl_backup = role_ctrl; + role_ctrl |= 0x0F; + role_ctrl &= ~(TCPC_ROLE_CTRL_DRP); + ret = max_tcpci_write8(chip, TCPC_ROLE_CTRL, role_ctrl); + if (ret < 0) + return false; + + chip->contaminant_state = max_contaminant_detect_contaminant(chip); + + ret = max_tcpci_write8(chip, TCPC_ROLE_CTRL, role_ctrl_backup); + if (ret < 0) + return false; + + if (chip->contaminant_state == DETECTED) { + max_contaminant_enable_dry_detection(chip); + return true; + } + } + return false; + } else if (chip->contaminant_state == DETECTED) { + if (STATUS_CHECK(cc_status, TCPC_CC_STATUS_TOGGLING, 0)) { + chip->contaminant_state = max_contaminant_detect_contaminant(chip); + if (chip->contaminant_state == DETECTED) { + max_contaminant_enable_dry_detection(chip); + return true; + } + } + } + + return false; +} + +MODULE_DESCRIPTION("MAXIM TCPC CONTAMINANT Module"); +MODULE_AUTHOR("Badhri Jagan Sridharan "); +MODULE_LICENSE("GPL"); diff --git a/drivers/usb/typec/tcpm/tcpci_maxim.h b/drivers/usb/typec/tcpm/tcpci_maxim.h new file mode 100644 index 000000000000..2c1c4d161b0d --- /dev/null +++ b/drivers/usb/typec/tcpm/tcpci_maxim.h @@ -0,0 +1,89 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright 2022 Google, Inc + * + * MAXIM TCPC header file. + */ +#ifndef TCPCI_MAXIM_H_ +#define TCPCI_MAXIM_H_ + +#define VENDOR_CC_STATUS2 0x85 +#define CC1_VUFP_RD0P5 BIT(1) +#define CC2_VUFP_RD0P5 BIT(5) +#define TCPC_VENDOR_FLADC_STATUS 0x89 + +#define TCPC_VENDOR_CC_CTRL1 0x8c +#define CCCONNDRY BIT(7) +#define CCCOMPEN BIT(5) + +#define TCPC_VENDOR_CC_CTRL2 0x8d +#define SBUOVPDIS BIT(7) +#define CCOVPDIS BIT(6) +#define SBURPCTRL BIT(5) +#define CCLPMODESEL_MASK GENMASK(4, 3) +#define ULTRA_LOW_POWER_MODE BIT(3) +#define CCRPCTRL_MASK GENMASK(2, 0) +#define UA_1_SRC 1 +#define UA_80_SRC 3 + +#define TCPC_VENDOR_CC_CTRL3 0x8e +#define CCWTRDEB_MASK GENMASK(7, 6) +#define CCWTRDEB_SHIFT 6 +#define CCWTRDEB_1MS 1 +#define CCWTRSEL_MASK GENMASK(5, 3) +#define CCWTRSEL_SHIFT 3 +#define CCWTRSEL_1V 0x4 +#define CCLADDERDIS BIT(2) +#define WTRCYCLE_MASK BIT(0) +#define WTRCYCLE_SHIFT 0 +#define WTRCYCLE_2_4_S 0 +#define WTRCYCLE_4_8_S 1 + +#define TCPC_VENDOR_ADC_CTRL1 0x91 +#define ADCINSEL_MASK GENMASK(7, 5) +#define ADC_CHANNEL_OFFSET 5 +#define ADCEN BIT(0) + +enum contamiant_state { + NOT_DETECTED, + DETECTED, + SINK, +}; + +/* + * @potential_contaminant: + * Last returned result to tcpm indicating whether the TCPM port + * has potential contaminant. + */ +struct max_tcpci_chip { + struct tcpci_data data; + struct tcpci *tcpci; + struct device *dev; + struct i2c_client *client; + struct tcpm_port *port; + enum contamiant_state contaminant_state; +}; + +static inline int max_tcpci_read16(struct max_tcpci_chip *chip, unsigned int reg, u16 *val) +{ + return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u16)); +} + +static inline int max_tcpci_write16(struct max_tcpci_chip *chip, unsigned int reg, u16 val) +{ + return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u16)); +} + +static inline int max_tcpci_read8(struct max_tcpci_chip *chip, unsigned int reg, u8 *val) +{ + return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u8)); +} + +static inline int max_tcpci_write8(struct max_tcpci_chip *chip, unsigned int reg, u8 val) +{ + return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u8)); +} + +bool max_contaminant_is_contaminant(struct max_tcpci_chip *chip, bool disconnect_while_debounce); + +#endif // TCPCI_MAXIM_H_ diff --git a/drivers/usb/typec/tcpm/tcpci_maxim.c b/drivers/usb/typec/tcpm/tcpci_maxim_core.c similarity index 93% rename from drivers/usb/typec/tcpm/tcpci_maxim.c rename to drivers/usb/typec/tcpm/tcpci_maxim_core.c index 83e140ffcc3e..f32cda2a5e3a 100644 --- a/drivers/usb/typec/tcpm/tcpci_maxim.c +++ b/drivers/usb/typec/tcpm/tcpci_maxim_core.c @@ -1,6 +1,6 @@ -// SPDX-License-Identifier: GPL-2.0 +// SPDX-License-Identifier: GPL-2.0+ /* - * Copyright (C) 2020, Google LLC + * Copyright (C) 2020 - 2022, Google LLC * * MAXIM TCPCI based TCPC driver */ @@ -15,6 +15,8 @@ #include #include +#include "tcpci_maxim.h" + #define PD_ACTIVITY_TIMEOUT_MS 10000 #define TCPC_VENDOR_ALERT 0x80 @@ -39,14 +41,6 @@ #define MAX_BUCK_BOOST_SOURCE 0xa #define MAX_BUCK_BOOST_SINK 0x5 -struct max_tcpci_chip { - struct tcpci_data data; - struct tcpci *tcpci; - struct device *dev; - struct i2c_client *client; - struct tcpm_port *port; -}; - static const struct regmap_range max_tcpci_tcpci_range[] = { regmap_reg_range(0x00, 0x95) }; @@ -68,26 +62,6 @@ static struct max_tcpci_chip *tdata_to_max_tcpci(struct tcpci_data *tdata) return container_of(tdata, struct max_tcpci_chip, data); } -static int max_tcpci_read16(struct max_tcpci_chip *chip, unsigned int reg, u16 *val) -{ - return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u16)); -} - -static int max_tcpci_write16(struct max_tcpci_chip *chip, unsigned int reg, u16 val) -{ - return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u16)); -} - -static int max_tcpci_read8(struct max_tcpci_chip *chip, unsigned int reg, u8 *val) -{ - return regmap_raw_read(chip->data.regmap, reg, val, sizeof(u8)); -} - -static int max_tcpci_write8(struct max_tcpci_chip *chip, unsigned int reg, u8 val) -{ - return regmap_raw_write(chip->data.regmap, reg, &val, sizeof(u8)); -} - static void max_tcpci_init_regs(struct max_tcpci_chip *chip) { u16 alert_mask = 0; @@ -348,8 +322,14 @@ static irqreturn_t _max_tcpci_irq(struct max_tcpci_chip *chip, u16 status) if (status & TCPC_ALERT_VBUS_DISCNCT) tcpm_vbus_change(chip->port); - if (status & TCPC_ALERT_CC_STATUS) - tcpm_cc_change(chip->port); + if (status & TCPC_ALERT_CC_STATUS) { + if (chip->contaminant_state == DETECTED || tcpm_port_is_toggling(chip->port)) { + if (!max_contaminant_is_contaminant(chip, false)) + tcpm_port_clean(chip->port); + } else { + tcpm_cc_change(chip->port); + } + } if (status & TCPC_ALERT_POWER_STATUS) process_power_status(chip); @@ -438,6 +418,14 @@ static int tcpci_init(struct tcpci *tcpci, struct tcpci_data *data) return -1; } +static void max_tcpci_check_contaminant(struct tcpci *tcpci, struct tcpci_data *tdata) +{ + struct max_tcpci_chip *chip = tdata_to_max_tcpci(tdata); + + if (!max_contaminant_is_contaminant(chip, true)) + tcpm_port_clean(chip->port); +} + static int max_tcpci_probe(struct i2c_client *client) { int ret; @@ -471,6 +459,7 @@ static int max_tcpci_probe(struct i2c_client *client) chip->data.auto_discharge_disconnect = true; chip->data.vbus_vsafe0v = true; chip->data.set_partner_usb_comm_capable = max_tcpci_set_partner_usb_comm_capable; + chip->data.check_contaminant = max_tcpci_check_contaminant; max_tcpci_init_regs(chip); chip->tcpci = tcpci_register_port(chip->dev, &chip->data);