From patchwork Tue Dec 6 01:48:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Badhri Jagan Sridharan X-Patchwork-Id: 631506 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 2E6E6C4708E for ; Tue, 6 Dec 2022 01:48:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233536AbiLFBsh (ORCPT ); Mon, 5 Dec 2022 20:48:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55232 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233417AbiLFBsc (ORCPT ); Mon, 5 Dec 2022 20:48:32 -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 81CE712D03 for ; Mon, 5 Dec 2022 17:48:30 -0800 (PST) Received: by mail-yb1-xb49.google.com with SMTP id j6-20020a05690212c600b006fc7f6e6955so13514108ybu.12 for ; Mon, 05 Dec 2022 17:48:30 -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=Ona3nQhBrLZaaG1x9qU+YFP1W+urJRD03FwSRumD8gY=; b=A9qtxOI/Tdaj12nkeMWSvyYXEDRYdvwR9ZNvaD3X4xeDj3Q/gr9YExgaHfl6/7CVp4 IiBEuEYJodQbCTRISUhhLld+xQXoGm1Uai+faW3X26A2qk+DRP2/p44ABbpaaBOafmWZ bLaGGv80EP0wniY2zoH8EDYHoDR92aEHUC3uVkQatTPyeWFEqfnkBh55xXjG1NqTWTRj UItTrOybrYfAUF4eeFm87KNPpuJgj4UCoRjRE4B+WhgBgCXGrptlrwBy9ug5WfhrGMEC Xe88y7LWF5q6t8921RfFoyJXYnWQsRDzYkB0xZrgofTBBlMAJrdPaKsoyobdivL51ykE Wn7g== 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=Ona3nQhBrLZaaG1x9qU+YFP1W+urJRD03FwSRumD8gY=; b=xfW97sjuaMuTMxD5yDJjv0l3D6cQLAzcP3B5vtUiEW9R5kUWL/MqX4ol6T+oUzrwK7 Gpu3T8wRuD4nRC1RIZglR4BU/BcYOgNrGY8oO6abZMOvoXJYkLHTHPhP/SXyqnAxevrb 7DRtIf60lFXcdTxjcEfU2+4iOmOu1pdrtL2OqvyM2a7z/+PLk2/0ArV8/XS8BvhesX+9 RgtzeZJbXLLTSuhk+DhgcuS8kzry/cfAG4Rq/V3FB2uu6IK6MemoGgvhPQGpPlCy3GMX o+UBEzApyF1mpXX6+yU8o9cYIzO0zLZVh3C+QcsgB8sDZJ9/yhkBGBFi7NijT+ooUGoK TlWg== X-Gm-Message-State: ANoB5pn1P/tufvms0SeChOZDfkyd1DnPvDSlzRU026C/lMMbCN89J4Qh t4bZZ6lIqZGOQKSFQYRC7uyYHW+bdpA= X-Google-Smtp-Source: AA0mqf4TxJ6SLgxeM9J8xo2oTCf3oCc6zEsb7PNWb2Mzf0cWVRRrct4FgLR/l9ubhN9QaM+GbzAeh3R1aIg= X-Received: from badhri.mtv.corp.google.com ([2620:15c:211:201:8c86:3c57:a044:cb9]) (user=badhri job=sendgmr) by 2002:a25:8:0:b0:6f2:2d25:6623 with SMTP id 8-20020a250008000000b006f22d256623mr49805461yba.481.1670291309822; Mon, 05 Dec 2022 17:48:29 -0800 (PST) Date: Mon, 5 Dec 2022 17:48:22 -0800 In-Reply-To: <20221206014822.4105421-1-badhri@google.com> Mime-Version: 1.0 References: <20221206014822.4105421-1-badhri@google.com> X-Mailer: git-send-email 2.39.0.rc0.267.gcb52ba06e7-goog Message-ID: <20221206014822.4105421-3-badhri@google.com> Subject: [PATCH v4 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 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 | 338 ++++++++++++++++++ drivers/usb/typec/tcpm/tcpci_maxim.h | 91 +++++ .../{tcpci_maxim.c => tcpci_maxim_core.c} | 78 ++-- 4 files changed, 476 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} (89%) 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..6eb11fb33715 --- /dev/null +++ b/drivers/usb/typec/tcpm/maxim_contaminant.c @@ -0,0 +1,338 @@ +// 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); + /* 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); + /* 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 void 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; + + /* Enable comparators */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL1, CCCOMPEN, CCCOMPEN); + if (ret < 0) + return; + + /* 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; + + usleep_range(5000, 6000); + ret = max_tcpci_read8(chip, VENDOR_CC_STATUS2, vendor_cc_status2_cc1); + if (ret < 0) + return; + + ret = regmap_update_bits(regmap, TCPC_TCPC_CTRL, TCPC_TCPC_CTRL_ORIENTATION, PLUG_ORNT_CC2); + if (ret < 0) + return; + + usleep_range(5000, 6000); + ret = max_tcpci_read8(chip, VENDOR_CC_STATUS2, vendor_cc_status2_cc2); + if (ret < 0) + return; + + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL1, CCCOMPEN, 0); + if (ret < 0) + return; + regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, CCRPCTRL_MASK, 0); +} + +static int max_contaminant_detect_contaminant(struct max_tcpci_chip *chip) +{ + int cc1_k, cc2_k, sbu1_k, sbu2_k; + u8 vendor_cc_status2_cc1 = 0xff, vendor_cc_status2_cc2 = 0xff; + u8 role_ctrl = 0, role_ctrl_backup = 0; + int inferred_state = NOT_DETECTED; + + max_tcpci_read8(chip, TCPC_ROLE_CTRL, &role_ctrl); + role_ctrl_backup = role_ctrl; + role_ctrl = 0x0F; + max_tcpci_write8(chip, TCPC_ROLE_CTRL, role_ctrl); + + cc1_k = max_contaminant_read_resistance_kohm(chip, CC1_SCALE2, READ1_SLEEP_MS, false); + cc2_k = max_contaminant_read_resistance_kohm(chip, CC2_SCALE2, READ2_SLEEP_MS, false); + + sbu1_k = max_contaminant_read_resistance_kohm(chip, SBU1, READ1_SLEEP_MS, false); + sbu2_k = max_contaminant_read_resistance_kohm(chip, SBU2, READ2_SLEEP_MS, false); + max_contaminant_read_comparators(chip, &vendor_cc_status2_cc1, &vendor_cc_status2_cc2); + + 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; +} + +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; + enum contamiant_state state; + + max_tcpci_read8(chip, TCPC_CC_STATUS, &cc_status); + max_tcpci_read8(chip, TCPC_POWER_CTRL, &pwr_cntl); + + if (chip->contaminant_state == NOT_DETECTED || chip->contaminant_state == SINK) { + if (!disconnect_while_debounce) + msleep(100); + + max_tcpci_read8(chip, TCPC_CC_STATUS, &cc_status); + if (IS_CC_OPEN(cc_status)) { + u8 role_ctrl, role_ctrl_backup; + + max_tcpci_read8(chip, TCPC_ROLE_CTRL, &role_ctrl); + role_ctrl_backup = role_ctrl; + role_ctrl |= 0x0F; + role_ctrl &= ~(TCPC_ROLE_CTRL_DRP); + max_tcpci_write8(chip, TCPC_ROLE_CTRL, role_ctrl); + + chip->contaminant_state = max_contaminant_detect_contaminant(chip); + + max_tcpci_write8(chip, TCPC_ROLE_CTRL, role_ctrl_backup); + if (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 (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..1a78e1ac3820 --- /dev/null +++ b/drivers/usb/typec/tcpm/tcpci_maxim.h @@ -0,0 +1,91 @@ +/* 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; + enum tcpm_state tcpm_current_state; + bool potential_contaminant; +}; + +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 89% rename from drivers/usb/typec/tcpm/tcpci_maxim.c rename to drivers/usb/typec/tcpm/tcpci_maxim_core.c index 83e140ffcc3e..8e6770ac2953 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) { + 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 +418,38 @@ 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, chip->tcpm_current_state != TOGGLING)) + tcpm_port_clean(chip->port); +} + +static bool max_tcpci_is_potential_contaminant(struct tcpci *tcpci, struct tcpci_data *tdata, + enum tcpm_state current_state) +{ + struct max_tcpci_chip *chip = tdata_to_max_tcpci(tdata); + enum tcpm_state tcpm_prev_state = chip->tcpm_current_state; + + /* + * Return previous determinted contaminant status when tcpm is in CHECK_CONTAMINANT + * state. Do not update the tcpm current state either. + */ + if (current_state == CHECK_CONTAMINANT) + return chip->potential_contaminant; + + chip->tcpm_current_state = current_state; + + if ((tcpm_prev_state == SRC_ATTACH_WAIT && current_state == SRC_UNATTACHED) || + (tcpm_prev_state == SNK_ATTACH_WAIT && current_state == SNK_UNATTACHED)) + chip->potential_contaminant = true; + else + chip->potential_contaminant = false; + + return chip->potential_contaminant; +} + static int max_tcpci_probe(struct i2c_client *client) { int ret; @@ -471,6 +483,8 @@ 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; + chip->data.is_potential_contaminant = max_tcpci_is_potential_contaminant; max_tcpci_init_regs(chip); chip->tcpci = tcpci_register_port(chip->dev, &chip->data);