From patchwork Wed Aug 10 20:47:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Andersson X-Patchwork-Id: 597817 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 9F73FC25B08 for ; Wed, 10 Aug 2022 20:45:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233418AbiHJUpU (ORCPT ); Wed, 10 Aug 2022 16:45:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33682 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233405AbiHJUpS (ORCPT ); Wed, 10 Aug 2022 16:45:18 -0400 Received: from mail-ot1-x332.google.com (mail-ot1-x332.google.com [IPv6:2607:f8b0:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 858962180A for ; Wed, 10 Aug 2022 13:45:16 -0700 (PDT) Received: by mail-ot1-x332.google.com with SMTP id 53-20020a9d0838000000b006371d896343so1618849oty.10 for ; Wed, 10 Aug 2022 13:45:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc; bh=dMcktl1QXrQAu4/lxweJmgGTRoL5J5XiIsn76k36QrA=; b=jItK5DhkxS9JwW9BxVt6w130JsHuD7G3/9fdDOaLd7KFnb2va6uV6QUYEwkCM5mh/Q MI0pY6eFOfJG37CwEj5huPQN8PbdHyptxwYvUZ66pUkqV0SUQNFrleGzqS3veUmwBRe7 /8jxVYn/XnEifJClw8L+dG+w7plF/pPDJCnnRQsCggqn25MoCIau+yVYb2vB13D8vHKR e2tSdmmdP0CnE6hxaG0XFe0fCHJB7RBqSCNVVFKL5rHt2vT4igXP0RYrj3OTefudDhug 9KNcP7cEzEb9eCNcG0n/6U1IobXObM9sZo1HXNdykzX/4CADxpx+jWqWtW/ga2EZqNjg +A8Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc; bh=dMcktl1QXrQAu4/lxweJmgGTRoL5J5XiIsn76k36QrA=; b=6l1NvVZnpEGeo2hIyNObhpqgw2rMMQT2z2V4w3wFZMWY+rGb/9aAjQ8rHhhV3wPuoc HltMyDogiPhk8cSKnJ4HXycY/5tX7eS3xq3pVkKS6vqtwPtRuOkaJkMP3Hj7LAxbBUhp SwCnJluOV79M3+ojpwrfI8yOjpxrj/hgX8ttUTTEPVDAOLt+XQJa9JK3UZglwbo2igtt 0KefaUH8CnvmQ3rcGzMFB6TJdUW3+65I4Pryv29nvTWV6aS25SBz/8tHhRd1eQT4KsKX i9yutQdG/nczrwVGkBHz7Ft3q2UiTt/7+RW0LB4WeHxzrrF4pyCKmG4MDVad+QovUPqi NKQQ== X-Gm-Message-State: ACgBeo3BMHqb4wd0eAxa9viULBW9gt70crM44HbYQHLnlve0yYL2s/RL 53w1GdhTodV01brFTMbXCcIx6w== X-Google-Smtp-Source: AA6agR5qnj51lBYmtlv62UVEk/P8fwZKAXmcs/gkZnrofJrOCcC8VPx2S+L/RUq/faJKOTZUYGwdNg== X-Received: by 2002:a9d:4d13:0:b0:636:bdd9:b57b with SMTP id n19-20020a9d4d13000000b00636bdd9b57bmr8751953otf.26.1660164315819; Wed, 10 Aug 2022 13:45:15 -0700 (PDT) Received: from ripper.. (104-57-184-186.lightspeed.austtx.sbcglobal.net. [104.57.184.186]) by smtp.gmail.com with ESMTPSA id f12-20020a056870548c00b000f2455e26acsm3968218oan.48.2022.08.10.13.45.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Aug 2022 13:45:15 -0700 (PDT) From: Bjorn Andersson To: Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Heikki Krogerus Cc: linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org Subject: [PATCH 2/2] usb: typec: mux: Introduce GPIO-based SBU mux Date: Wed, 10 Aug 2022 13:47:50 -0700 Message-Id: <20220810204750.3672362-3-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220810204750.3672362-1-bjorn.andersson@linaro.org> References: <20220810204750.3672362-1-bjorn.andersson@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org A design found in various Qualcomm-based boards is to use a USB switch, controlled through a pair of GPIO lines to connect, disconnect and switch the orientation of the SBU lines in USB Type-C applications. This introduces a generic driver, which implements the typec_switch and typec_mux interfaces to perform these operations. Signed-off-by: Bjorn Andersson --- drivers/usb/typec/mux/Kconfig | 6 + drivers/usb/typec/mux/Makefile | 1 + drivers/usb/typec/mux/gpio-sbu-mux.c | 171 +++++++++++++++++++++++++++ 3 files changed, 178 insertions(+) create mode 100644 drivers/usb/typec/mux/gpio-sbu-mux.c diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig index 5eb2c17d72c1..c46fa4f9d3df 100644 --- a/drivers/usb/typec/mux/Kconfig +++ b/drivers/usb/typec/mux/Kconfig @@ -12,6 +12,12 @@ config TYPEC_MUX_FSA4480 common USB Type-C connector. If compiled as a module, the module will be named fsa4480. +config TYPEC_MUX_GPIO_SBU + tristate "Generic GPIO based SBU mux for USB Type-C applications" + help + Say Y or M if your system uses a GPIO based mux for managing the + connected state and the swapping of the SBU lines in a Type-C port. + config TYPEC_MUX_PI3USB30532 tristate "Pericom PI3USB30532 Type-C cross switch driver" depends on I2C diff --git a/drivers/usb/typec/mux/Makefile b/drivers/usb/typec/mux/Makefile index e52a56c16bfb..dda67e19b58b 100644 --- a/drivers/usb/typec/mux/Makefile +++ b/drivers/usb/typec/mux/Makefile @@ -1,5 +1,6 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_TYPEC_MUX_FSA4480) += fsa4480.o +obj-$(CONFIG_TYPEC_MUX_GPIO_SBU) += gpio-sbu-mux.o obj-$(CONFIG_TYPEC_MUX_PI3USB30532) += pi3usb30532.o obj-$(CONFIG_TYPEC_MUX_INTEL_PMC) += intel_pmc_mux.o diff --git a/drivers/usb/typec/mux/gpio-sbu-mux.c b/drivers/usb/typec/mux/gpio-sbu-mux.c new file mode 100644 index 000000000000..35f7bd3029a9 --- /dev/null +++ b/drivers/usb/typec/mux/gpio-sbu-mux.c @@ -0,0 +1,171 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2022 Linaro Ltd. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct gpio_sbu_mux { + struct gpio_desc *enable_gpio; + struct gpio_desc *select_gpio; + + struct typec_switch_dev *sw; + struct typec_mux_dev *mux; + + struct mutex lock; /* protect enabled and swapped */ + bool enabled; + bool swapped; +}; + +static int gpio_sbu_switch_set(struct typec_switch_dev *sw, + enum typec_orientation orientation) +{ + struct gpio_sbu_mux *sbu_mux = typec_switch_get_drvdata(sw); + bool enabled; + bool swapped; + + mutex_lock(&sbu_mux->lock); + + enabled = sbu_mux->enabled; + + switch (orientation) { + case TYPEC_ORIENTATION_NONE: + enabled = false; + break; + case TYPEC_ORIENTATION_NORMAL: + swapped = false; + break; + case TYPEC_ORIENTATION_REVERSE: + swapped = true; + break; + } + + if (enabled != sbu_mux->enabled) + gpiod_set_value(sbu_mux->enable_gpio, enabled); + + if (swapped != sbu_mux->swapped) + gpiod_set_value(sbu_mux->select_gpio, swapped); + + sbu_mux->enabled = enabled; + sbu_mux->swapped = swapped; + + mutex_unlock(&sbu_mux->lock); + + return 0; +} + +static int gpio_sbu_mux_set(struct typec_mux_dev *mux, + struct typec_mux_state *state) +{ + struct gpio_sbu_mux *sbu_mux = typec_mux_get_drvdata(mux); + + mutex_lock(&sbu_mux->lock); + + switch (state->mode) { + case TYPEC_STATE_SAFE: + case TYPEC_STATE_USB: + sbu_mux->enabled = false; + break; + case TYPEC_DP_STATE_C: + case TYPEC_DP_STATE_D: + case TYPEC_DP_STATE_E: + sbu_mux->enabled = true; + break; + default: + break; + } + + gpiod_set_value(sbu_mux->enable_gpio, sbu_mux->enabled); + + mutex_unlock(&sbu_mux->lock); + + return 0; +} + +static int gpio_sbu_mux_probe(struct platform_device *pdev) +{ + struct typec_switch_desc sw_desc = { }; + struct typec_mux_desc mux_desc = { }; + struct device *dev = &pdev->dev; + struct gpio_sbu_mux *sbu_mux; + + sbu_mux = devm_kzalloc(dev, sizeof(*sbu_mux), GFP_KERNEL); + if (!sbu_mux) + return -ENOMEM; + + mutex_init(&sbu_mux->lock); + + sbu_mux->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(sbu_mux->enable_gpio)) + return dev_err_probe(dev, PTR_ERR(sbu_mux->enable_gpio), + "unable to acquire enable gpio\n"); + + sbu_mux->select_gpio = devm_gpiod_get(dev, "select", GPIOD_OUT_LOW); + if (IS_ERR(sbu_mux->select_gpio)) + return dev_err_probe(dev, PTR_ERR(sbu_mux->select_gpio), + "unable to acquire select gpio\n"); + + sw_desc.drvdata = sbu_mux; + sw_desc.fwnode = dev_fwnode(dev); + sw_desc.set = gpio_sbu_switch_set; + + sbu_mux->sw = typec_switch_register(dev, &sw_desc); + if (IS_ERR(sbu_mux->sw)) + return dev_err_probe(dev, PTR_ERR(sbu_mux->sw), + "failed to register typec switch\n"); + + mux_desc.drvdata = sbu_mux; + mux_desc.fwnode = dev_fwnode(dev); + mux_desc.set = gpio_sbu_mux_set; + + sbu_mux->mux = typec_mux_register(dev, &mux_desc); + if (IS_ERR(sbu_mux->mux)) { + typec_switch_unregister(sbu_mux->sw); + return dev_err_probe(dev, PTR_ERR(sbu_mux->mux), + "failed to register typec mux\n"); + } + + platform_set_drvdata(pdev, sbu_mux); + + return 0; +} + +static int gpio_sbu_mux_remove(struct platform_device *pdev) +{ + struct gpio_sbu_mux *sbu_mux = platform_get_drvdata(pdev); + + gpiod_set_value(sbu_mux->enable_gpio, 0); + + typec_mux_unregister(sbu_mux->mux); + typec_switch_unregister(sbu_mux->sw); + + return 0; +} + +static const struct of_device_id gpio_sbu_mux_match[] = { + { .compatible = "gpio-sbu-mux", }, + {} +}; +MODULE_DEVICE_TABLE(of, gpio_sbu_mux_match); + +static struct platform_driver gpio_sbu_mux_driver = { + .probe = gpio_sbu_mux_probe, + .remove = gpio_sbu_mux_remove, + .driver = { + .name = "gpio_sbu_mux", + .of_match_table = gpio_sbu_mux_match, + }, +}; +module_platform_driver(gpio_sbu_mux_driver); + +MODULE_DESCRIPTION("GPIO based SBU mux driver"); +MODULE_LICENSE("GPL");