From patchwork Mon Mar 7 03:40:40 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bjorn Andersson X-Patchwork-Id: 549163 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 91801C43219 for ; Mon, 7 Mar 2022 03:39:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235113AbiCGDkC (ORCPT ); Sun, 6 Mar 2022 22:40:02 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60230 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235055AbiCGDjz (ORCPT ); Sun, 6 Mar 2022 22:39:55 -0500 Received: from mail-oi1-x236.google.com (mail-oi1-x236.google.com [IPv6:2607:f8b0:4864:20::236]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C60C4EA00 for ; Sun, 6 Mar 2022 19:39:01 -0800 (PST) Received: by mail-oi1-x236.google.com with SMTP id i5so13919517oih.1 for ; Sun, 06 Mar 2022 19:39:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=49L7WLNCDMugCqX6fsdECZs0GVJID2sbYVWyG32rCpw=; b=Tx6KfbiJuFYkqkl/CBjrqJFb7VDjM4fGn5H8eUrcLSVrmbTKPX5aQ/BbdiItNh4Tcg VT3gFp3QPX9XEIesM1Le8LEflQITkEkS1ok7D805kIWtS5FW7EEFqhTv+ITH1XGWgvk9 8yuy64GDDIhUaqwpxz7DkdEGOAppZ7w6rBVvTrIzvsiacOZrYuV5qdX887U0Wd0/4omZ nCBlw1sUhs6W3qU+8ZroPS+cDLCQ82V+azMrIeirUZvIqIE64Cn0LdbjSrP1lactiY0C qcOCeMozci+AGvRIqr73XxGoVdETpWz/3336A4evyzAdr8MnU8EsBwLbP8TXSztwxVYs 0LdA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=49L7WLNCDMugCqX6fsdECZs0GVJID2sbYVWyG32rCpw=; b=6gZ614XRGSKSLpgaUG92aCVxqWBeoPV1lTwsM0GgZ8s9JVOjzeuHkyurdYfKR0rmYr rYplskqMrBEn0XDoUwGM/o9o0SCdal7UAjWf3haoUPXdmTjbLeuzQMkKMTFipePaKDj1 gUebP+022d2Ua+ydUGpNu83dz8ik2CW+nnNCgRw+1Mm+kYDBlTm35oNivnqHWblxzOUN lTua/imwySlx35L1k4XpVQoEuw0HiKdd8sosJncYbKe9aoy/Bnn714DmdZBgodSRyCn1 hT41GmaP7vsrR4oKNZUnlgnE0UR1Or0VJBS2sF0FiN53FWXhYdk9VEdr3/DTf6tO7+ye yo+w== X-Gm-Message-State: AOAM531fCF1XUwWYT8uVRwhLoAZ0UqD4JKxK0lokzbQjp4kk/Se5Kk7i LEUq1xHh4lUKrMnh4ldxpDJleA== X-Google-Smtp-Source: ABdhPJyX2BXF3WJ65qS0nhgl/lTvKjLYe+ljR3L17V/GVwnZXMDGrtI5cuhIRDfC5MxwA0yIA+9Cmg== X-Received: by 2002:a05:6808:2022:b0:2d4:752b:dfb5 with SMTP id q34-20020a056808202200b002d4752bdfb5mr5841086oiw.174.1646624340640; Sun, 06 Mar 2022 19:39:00 -0800 (PST) Received: from ripper.. ([2600:1700:a0:3dc8:205:1bff:fec0:b9b3]) by smtp.gmail.com with ESMTPSA id o2-20020a05687072c200b000d9ae3e1fabsm5005172oak.12.2022.03.06.19.38.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 06 Mar 2022 19:39:00 -0800 (PST) From: Bjorn Andersson To: Rob Herring , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , "Rafael J. Wysocki" , Hans de Goede Cc: linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Dmitry Baryshkov Subject: [PATCH v4 7/7] usb: typec: mux: Add On Semi fsa4480 driver Date: Sun, 6 Mar 2022 19:40:40 -0800 Message-Id: <20220307034040.1111107-7-bjorn.andersson@linaro.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20220307034040.1111107-1-bjorn.andersson@linaro.org> References: <20220307034040.1111107-1-bjorn.andersson@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org The ON Semiconductor FSA4480 is a USB Type-C port multimedia switch with support for analog audio headsets. It allows sharing a common USB Type-C port to pass USB2.0 signal, analog audio, sideband use wires and analog microphone signal. Due to lacking upstream audio support for testing, the audio muxing is left untouched, but implementation of muxing the SBU lines is provided as a pair of Type-C mux and switch devices. This provides the necessary support for enabling the DisplayPort altmode on devices with this circuit. Signed-off-by: Bjorn Andersson --- Changes since v3: - None Changes since v2: - Expanded Kconfig help text. - Fixed copyright year - Fixed spelling mistakes in comments - Introduce FSA4480_MAX_REGISTER - Use dev_err_probe() - Removed some useless blank lines. Changes since v1: - None drivers/usb/typec/mux/Kconfig | 10 ++ drivers/usb/typec/mux/Makefile | 1 + drivers/usb/typec/mux/fsa4480.c | 216 ++++++++++++++++++++++++++++++++ 3 files changed, 227 insertions(+) create mode 100644 drivers/usb/typec/mux/fsa4480.c diff --git a/drivers/usb/typec/mux/Kconfig b/drivers/usb/typec/mux/Kconfig index edead555835e..5eb2c17d72c1 100644 --- a/drivers/usb/typec/mux/Kconfig +++ b/drivers/usb/typec/mux/Kconfig @@ -2,6 +2,16 @@ menu "USB Type-C Multiplexer/DeMultiplexer Switch support" +config TYPEC_MUX_FSA4480 + tristate "ON Semi FSA4480 Analog Audio Switch driver" + depends on I2C + select REGMAP_I2C + help + Driver for the ON Semiconductor FSA4480 Analog Audio Switch, which + provides support for muxing analog audio and sideband signals on a + common USB Type-C connector. + If compiled as a module, the module will be named fsa4480. + 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 280a6f553115..e52a56c16bfb 100644 --- a/drivers/usb/typec/mux/Makefile +++ b/drivers/usb/typec/mux/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_TYPEC_MUX_FSA4480) += fsa4480.o obj-$(CONFIG_TYPEC_MUX_PI3USB30532) += pi3usb30532.o obj-$(CONFIG_TYPEC_MUX_INTEL_PMC) += intel_pmc_mux.o diff --git a/drivers/usb/typec/mux/fsa4480.c b/drivers/usb/typec/mux/fsa4480.c new file mode 100644 index 000000000000..ab8d014a6b79 --- /dev/null +++ b/drivers/usb/typec/mux/fsa4480.c @@ -0,0 +1,216 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021-2022 Linaro Ltd. + * Copyright (C) 2018-2020 The Linux Foundation + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define FSA4480_SWITCH_ENABLE 0x04 +#define FSA4480_SWITCH_SELECT 0x05 +#define FSA4480_SWITCH_STATUS1 0x07 +#define FSA4480_SLOW_L 0x08 +#define FSA4480_SLOW_R 0x09 +#define FSA4480_SLOW_MIC 0x0a +#define FSA4480_SLOW_SENSE 0x0b +#define FSA4480_SLOW_GND 0x0c +#define FSA4480_DELAY_L_R 0x0d +#define FSA4480_DELAY_L_MIC 0x0e +#define FSA4480_DELAY_L_SENSE 0x0f +#define FSA4480_DELAY_L_AGND 0x10 +#define FSA4480_RESET 0x1e +#define FSA4480_MAX_REGISTER 0x1f + +#define FSA4480_ENABLE_DEVICE BIT(7) +#define FSA4480_ENABLE_SBU GENMASK(6, 5) +#define FSA4480_ENABLE_USB GENMASK(4, 3) + +#define FSA4480_SEL_SBU_REVERSE GENMASK(6, 5) +#define FSA4480_SEL_USB GENMASK(4, 3) + +struct fsa4480 { + struct i2c_client *client; + + /* used to serialize concurrent change requests */ + struct mutex lock; + + struct typec_switch_dev *sw; + struct typec_mux_dev *mux; + + struct regmap *regmap; + + u8 cur_enable; + u8 cur_select; +}; + +static const struct regmap_config fsa4480_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = FSA4480_MAX_REGISTER, +}; + +static int fsa4480_switch_set(struct typec_switch_dev *sw, + enum typec_orientation orientation) +{ + struct fsa4480 *fsa = typec_switch_get_drvdata(sw); + u8 new_sel; + + mutex_lock(&fsa->lock); + new_sel = FSA4480_SEL_USB; + if (orientation == TYPEC_ORIENTATION_REVERSE) + new_sel |= FSA4480_SEL_SBU_REVERSE; + + if (new_sel == fsa->cur_select) + goto out_unlock; + + if (fsa->cur_enable & FSA4480_ENABLE_SBU) { + /* Disable SBU output while re-configuring the switch */ + regmap_write(fsa->regmap, FSA4480_SWITCH_ENABLE, + fsa->cur_enable & ~FSA4480_ENABLE_SBU); + + /* 35us to allow the SBU switch to turn off */ + usleep_range(35, 1000); + } + + regmap_write(fsa->regmap, FSA4480_SWITCH_SELECT, new_sel); + fsa->cur_select = new_sel; + + if (fsa->cur_enable & FSA4480_ENABLE_SBU) { + regmap_write(fsa->regmap, FSA4480_SWITCH_ENABLE, fsa->cur_enable); + + /* 15us to allow the SBU switch to turn on again */ + usleep_range(15, 1000); + } + +out_unlock: + mutex_unlock(&fsa->lock); + + return 0; +} + +static int fsa4480_mux_set(struct typec_mux_dev *mux, struct typec_mux_state *state) +{ + struct fsa4480 *fsa = typec_mux_get_drvdata(mux); + u8 new_enable; + + mutex_lock(&fsa->lock); + + new_enable = FSA4480_ENABLE_DEVICE | FSA4480_ENABLE_USB; + if (state->mode >= TYPEC_DP_STATE_A) + new_enable |= FSA4480_ENABLE_SBU; + + if (new_enable == fsa->cur_enable) + goto out_unlock; + + regmap_write(fsa->regmap, FSA4480_SWITCH_ENABLE, new_enable); + fsa->cur_enable = new_enable; + + if (new_enable & FSA4480_ENABLE_SBU) { + /* 15us to allow the SBU switch to turn off */ + usleep_range(15, 1000); + } + +out_unlock: + mutex_unlock(&fsa->lock); + + return 0; +} + +static int fsa4480_probe(struct i2c_client *client) +{ + struct device *dev = &client->dev; + struct typec_switch_desc sw_desc = { }; + struct typec_mux_desc mux_desc = { }; + struct fsa4480 *fsa; + + fsa = devm_kzalloc(dev, sizeof(*fsa), GFP_KERNEL); + if (!fsa) + return -ENOMEM; + + fsa->client = client; + mutex_init(&fsa->lock); + + fsa->regmap = devm_regmap_init_i2c(client, &fsa4480_regmap_config); + if (IS_ERR(fsa->regmap)) + return dev_err_probe(dev, PTR_ERR(fsa->regmap), "failed to initialize regmap\n"); + + fsa->cur_enable = FSA4480_ENABLE_DEVICE | FSA4480_ENABLE_USB; + fsa->cur_select = FSA4480_SEL_USB; + + /* set default settings */ + regmap_write(fsa->regmap, FSA4480_SLOW_L, 0x00); + regmap_write(fsa->regmap, FSA4480_SLOW_R, 0x00); + regmap_write(fsa->regmap, FSA4480_SLOW_MIC, 0x00); + regmap_write(fsa->regmap, FSA4480_SLOW_SENSE, 0x00); + regmap_write(fsa->regmap, FSA4480_SLOW_GND, 0x00); + regmap_write(fsa->regmap, FSA4480_DELAY_L_R, 0x00); + regmap_write(fsa->regmap, FSA4480_DELAY_L_MIC, 0x00); + regmap_write(fsa->regmap, FSA4480_DELAY_L_SENSE, 0x00); + regmap_write(fsa->regmap, FSA4480_DELAY_L_AGND, 0x09); + regmap_write(fsa->regmap, FSA4480_SWITCH_SELECT, fsa->cur_select); + regmap_write(fsa->regmap, FSA4480_SWITCH_ENABLE, fsa->cur_enable); + + sw_desc.drvdata = fsa; + sw_desc.fwnode = dev->fwnode; + sw_desc.set = fsa4480_switch_set; + + fsa->sw = typec_switch_register(dev, &sw_desc); + if (IS_ERR(fsa->sw)) + return dev_err_probe(dev, PTR_ERR(fsa->sw), "failed to register typec switch\n"); + + mux_desc.drvdata = fsa; + mux_desc.fwnode = dev->fwnode; + mux_desc.set = fsa4480_mux_set; + + fsa->mux = typec_mux_register(dev, &mux_desc); + if (IS_ERR(fsa->mux)) { + typec_switch_unregister(fsa->sw); + return dev_err_probe(dev, PTR_ERR(fsa->mux), "failed to register typec mux\n"); + } + + i2c_set_clientdata(client, fsa); + return 0; +} + +static int fsa4480_remove(struct i2c_client *client) +{ + struct fsa4480 *fsa = i2c_get_clientdata(client); + + typec_mux_unregister(fsa->mux); + typec_switch_unregister(fsa->sw); + + return 0; +} + +static const struct i2c_device_id fsa4480_table[] = { + { "fsa4480" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, fsa4480_table); + +static const struct of_device_id fsa4480_of_table[] = { + { .compatible = "fcs,fsa4480" }, + { } +}; +MODULE_DEVICE_TABLE(of, fsa4480_of_table); + +static struct i2c_driver fsa4480_driver = { + .driver = { + .name = "fsa4480", + .of_match_table = fsa4480_of_table, + }, + .probe_new = fsa4480_probe, + .remove = fsa4480_remove, + .id_table = fsa4480_table, +}; +module_i2c_driver(fsa4480_driver); + +MODULE_DESCRIPTION("ON Semiconductor FSA4480 driver"); +MODULE_LICENSE("GPL v2");