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[209.132.180.67]) by mx.google.com with ESMTP id b10si14685005pgw.388.2019.02.13.07.09.52; Wed, 13 Feb 2019 07:09:52 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@baylibre-com.20150623.gappssmtp.com header.s=20150623 header.b=RnMa0DCJ; spf=pass (google.com: best guess record for domain of devicetree-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=devicetree-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389954AbfBMPJv (ORCPT + 7 others); Wed, 13 Feb 2019 10:09:51 -0500 Received: from mail-ed1-f65.google.com ([209.85.208.65]:43739 "EHLO mail-ed1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392440AbfBMPJu (ORCPT ); Wed, 13 Feb 2019 10:09:50 -0500 Received: by mail-ed1-f65.google.com with SMTP id f9so2196590eds.10 for ; Wed, 13 Feb 2019 07:09:48 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=fg1xdGO8EkGUtIV12ZYanIZ1eOCYMIk7dyPh7m8OchY=; b=RnMa0DCJoxyCQchhKdk0Uy1ymckGzcFr/RpHobpa4tlBqlXutbV/trmJMBt2thP/gm hJvcCLrd0F0dgHNN1v8DnT5FQXX+EDmygwNYupaJ3FXFnipzVTtkcCy1tJlhD45A1mva SrViNrqHKZt6leQA92NtutTdSNqYJFUXfzk84l4mosT48da2BABL2kMByRRv3SdetjDH 6G/moKfylTMev/bHNGU7/BAQ/VHRJ/MHE9qFKSM/E0x4Ol12SkfYaL/a1qlXB2VLaOCR wzJ6+sKKnPd0y2f1FWyoJu/NR6zXedMj+GhRD27j0zX9UOj3awXwJuVSNMz7YqJaFLNc 6qGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=fg1xdGO8EkGUtIV12ZYanIZ1eOCYMIk7dyPh7m8OchY=; b=uUUiltOKaK6h+pvdwu7lDa3sSBHg5rotIZf4U0df2QQqg+gaTAtf6U8z4z8xZkGAbF I67Kfz6XGZkN0blVH2Zg4TR5hoyVHYIgWUP/DcfrYmz7dqzrrRsEU3EmCgIhaES1ARd7 K9e2LnXITrReFhd8Vhr2rurgn/fmrZLGZrv2DXsPWJr8kr4JKulk69mt1/g4dioSvK8k ZWbgHy6h0r6nA+kHYZxc1UHXUCaKFRT+9kZr8ppR+zzGEifboNl5XWheZefJ9F7eE1rR bNtUxp9a4FIqL/9cQFKUiaucJ7wIbIahpray6t4GTjhNN6cl7OmmuOEac/DsRST1DNPo rxyg== X-Gm-Message-State: AHQUAuaRr6Al+yusZg/O+qA4ICx6fMtrHrJcFNr3DncU8vGL0kFOfsej 1zSs+wB9FgOXHZyrSrR0XdhIVfn+ux/R+pr5 X-Received: by 2002:a17:906:a296:: with SMTP id i22mr741442ejz.62.1550070587890; Wed, 13 Feb 2019 07:09:47 -0800 (PST) Received: from loys-ubuntu-BY1835A49200471.thefacebook.com ([2620:10d:c092:180::1:4505]) by smtp.googlemail.com with ESMTPSA id k26sm1903941ejv.63.2019.02.13.07.09.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 13 Feb 2019 07:09:47 -0800 (PST) From: Loys Ollivier To: devicetree@vger.kernel.org, Johan Hovold Cc: Loys Ollivier , Rob Herring , Mark Rutland , linux-kernel@vger.kernel.org, Kevin Hilman , linux-amlogic@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Martin Blumenstingl Subject: [PATCH v4 4/4] gnss: add driver for mediatek receivers Date: Wed, 13 Feb 2019 16:09:29 +0100 Message-Id: <1550070569-18588-5-git-send-email-lollivier@baylibre.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1550070569-18588-1-git-send-email-lollivier@baylibre.com> References: <1550070569-18588-1-git-send-email-lollivier@baylibre.com> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Add driver for serial-connected Mediatek-based GNSS receivers. These devices typically boot transmitting vendor specific NMEA output sequences. The serial port bit rate is read from the device tree "current-speed". Note that the driver uses the generic GNSS serial implementation and therefore essentially only manages power abstracted into three power states: ACTIVE, STANDBY, and OFF. For mediatek receivers with a main supply and no enable-gpios, this simply means that the main supply is disabled in STANDBY and OFF (the optional backup supply is kept enabled while the driver is bound). Note that the timepulse-support is left unimplemented. Signed-off-by: Loys Ollivier --- v4: No changes v3: Sorted the Kconfig and Makefile Retained the original Copyright Removed "mediatek,mt3339" compatible. v2: Renamed from gtop/Globaltop to mtk/Mediatek. Added "mediatek,mt3339" compatible. drivers/gnss/Kconfig | 13 +++++ drivers/gnss/Makefile | 3 + drivers/gnss/mtk.c | 152 ++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 168 insertions(+) create mode 100644 drivers/gnss/mtk.c -- 2.7.4 diff --git a/drivers/gnss/Kconfig b/drivers/gnss/Kconfig index 6abc88514512..6d8c8027e1cd 100644 --- a/drivers/gnss/Kconfig +++ b/drivers/gnss/Kconfig @@ -15,6 +15,19 @@ if GNSS config GNSS_SERIAL tristate +config GNSS_MTK_SERIAL + tristate "Mediatek GNSS receiver support" + depends on SERIAL_DEV_BUS + select GNSS_SERIAL + help + Say Y here if you have a Mediatek-based GNSS receiver which uses a + serial interface. + + To compile this driver as a module, choose M here: the module will + be called gnss-mtk. + + If unsure, say N. + config GNSS_SIRF_SERIAL tristate "SiRFstar GNSS receiver support" depends on SERIAL_DEV_BUS diff --git a/drivers/gnss/Makefile b/drivers/gnss/Makefile index 5cf0ebe0330a..451f11401ecc 100644 --- a/drivers/gnss/Makefile +++ b/drivers/gnss/Makefile @@ -9,6 +9,9 @@ gnss-y := core.o obj-$(CONFIG_GNSS_SERIAL) += gnss-serial.o gnss-serial-y := serial.o +obj-$(CONFIG_GNSS_MTK_SERIAL) += gnss-mtk.o +gnss-mtk-y := mtk.o + obj-$(CONFIG_GNSS_SIRF_SERIAL) += gnss-sirf.o gnss-sirf-y := sirf.o diff --git a/drivers/gnss/mtk.c b/drivers/gnss/mtk.c new file mode 100644 index 000000000000..a5aad08fb9d7 --- /dev/null +++ b/drivers/gnss/mtk.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Mediatek GNSS receiver driver + * + * Copyright (C) 2018 Johan Hovold + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "serial.h" + +struct mtk_data { + struct regulator *v_bckp; + struct regulator *vcc; +}; + +static int mtk_set_active(struct gnss_serial *gserial) +{ + struct mtk_data *data = gnss_serial_get_drvdata(gserial); + int ret; + + ret = regulator_enable(data->vcc); + if (ret) + return ret; + + return 0; +} + +static int mtk_set_standby(struct gnss_serial *gserial) +{ + struct mtk_data *data = gnss_serial_get_drvdata(gserial); + int ret; + + ret = regulator_disable(data->vcc); + if (ret) + return ret; + + return 0; +} + +static int mtk_set_power(struct gnss_serial *gserial, + enum gnss_serial_pm_state state) +{ + switch (state) { + case GNSS_SERIAL_ACTIVE: + return mtk_set_active(gserial); + case GNSS_SERIAL_OFF: + case GNSS_SERIAL_STANDBY: + return mtk_set_standby(gserial); + } + + return -EINVAL; +} + +static const struct gnss_serial_ops mtk_gserial_ops = { + .set_power = mtk_set_power, +}; + +static int mtk_probe(struct serdev_device *serdev) +{ + struct gnss_serial *gserial; + struct mtk_data *data; + int ret; + + gserial = gnss_serial_allocate(serdev, sizeof(*data)); + if (IS_ERR(gserial)) { + ret = PTR_ERR(gserial); + return ret; + } + + gserial->ops = &mtk_gserial_ops; + + gserial->gdev->type = GNSS_TYPE_MTK; + + data = gnss_serial_get_drvdata(gserial); + + data->vcc = devm_regulator_get(&serdev->dev, "vcc"); + if (IS_ERR(data->vcc)) { + ret = PTR_ERR(data->vcc); + goto err_free_gserial; + } + + data->v_bckp = devm_regulator_get_optional(&serdev->dev, "v-bckp"); + if (IS_ERR(data->v_bckp)) { + ret = PTR_ERR(data->v_bckp); + if (ret == -ENODEV) + data->v_bckp = NULL; + else + goto err_free_gserial; + } + + if (data->v_bckp) { + ret = regulator_enable(data->v_bckp); + if (ret) + goto err_free_gserial; + } + + ret = gnss_serial_register(gserial); + if (ret) + goto err_disable_v_bckp; + + return 0; + +err_disable_v_bckp: + if (data->v_bckp) + regulator_disable(data->v_bckp); +err_free_gserial: + gnss_serial_free(gserial); + + return ret; +} + +static void mtk_remove(struct serdev_device *serdev) +{ + struct gnss_serial *gserial = serdev_device_get_drvdata(serdev); + struct mtk_data *data = gnss_serial_get_drvdata(gserial); + + gnss_serial_deregister(gserial); + if (data->v_bckp) + regulator_disable(data->v_bckp); + gnss_serial_free(gserial); +}; + +#ifdef CONFIG_OF +static const struct of_device_id mtk_of_match[] = { + { .compatible = "globaltop,pa6h" }, + {}, +}; +MODULE_DEVICE_TABLE(of, mtk_of_match); +#endif + +static struct serdev_device_driver mtk_driver = { + .driver = { + .name = "gnss-mtk", + .of_match_table = of_match_ptr(mtk_of_match), + .pm = &gnss_serial_pm_ops, + }, + .probe = mtk_probe, + .remove = mtk_remove, +}; +module_serdev_device_driver(mtk_driver); + +MODULE_AUTHOR("Loys Ollivier "); +MODULE_DESCRIPTION("Mediatek GNSS receiver driver"); +MODULE_LICENSE("GPL v2");