From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 04DE2C282C8 for ; Mon, 28 Jan 2019 16:38:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C1A2220811 for ; Mon, 28 Jan 2019 16:38:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=baylibre-com.20150623.gappssmtp.com header.i=@baylibre-com.20150623.gappssmtp.com header.b="jCkIK7qO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390563AbfA1QiS (ORCPT ); Mon, 28 Jan 2019 11:38:18 -0500 Received: from mail-wr1-f66.google.com ([209.85.221.66]:41798 "EHLO mail-wr1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390562AbfA1QiM (ORCPT ); Mon, 28 Jan 2019 11:38:12 -0500 Received: by mail-wr1-f66.google.com with SMTP id x10so18766081wrs.8 for ; Mon, 28 Jan 2019 08:38:11 -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=J7q2ZjQCinm0IA/wotZbsDzW17KZqQK/HytBY9aOmww=; b=jCkIK7qOU+oQ1Qf34xBNH44bu15/Eyc78HQubpYXfrNqRhzbGg3DLSspO5WFomgfxQ ci7q5n3OMQVcMVv4ouYs3jdw8Bl9a29EfuewI2VUXE+o99WXguBy4COns+R1Jy4pUuPO GCAKPLG+EJpDA1hrhDo2vLPv1oWl4fhuwHBI2/qksQuGYUkCa+Z+Fi3Ng1ipN4fh9PPU NLIrrFaHrfT0pVMt/FfGAd8c2ldttUAuWPUMA6fYtinkc2rI9D0uSos4KvDod3NPbZIR KNNYoff6rjsNQWcGRMxK5grcIt2BEhRZ9c4Q8P+6l6g91fcANuGpSC9G7rDhAd6fFCGb IEPQ== 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=J7q2ZjQCinm0IA/wotZbsDzW17KZqQK/HytBY9aOmww=; b=V1D/CRzjO5XP/UFsGQCx+WaqOJheRIQhE86Uqh6KiItbB1F1TkgdpgJJ2ElWOSEY0a Sp6eER+Ny5cPL3JCXIXF3Rb1ifkLGK/UCfQJ0ZbTER5gPPo9KQKBZi3rMkzofoCnYYo0 JsDho90u6LdWvm95Ag0zO4+blco5HWgPLn90cX4rKqrUk5OFnA7pIbzAcKMJtTwZdPxP H5qFcgqdKV1+NabgYIlciyUl5lBzK8tKBkIl17kakrO8sB081RD8ipraGzEFgNK7M2QK fFYFa0xpOYnebBxRecpjm9mlEGVFrm8LXq3us7zPvfj8hLjJO3p82zkVQ8MSPX620rAP kngw== X-Gm-Message-State: AJcUukdkrgSpZ+xVS0l2aV8rTZzV2PBajEmRG1YzVbQr0Fqd15pECu55 QZu23E+6yzjHWfsGS3dERs4HpQ== X-Google-Smtp-Source: ALg8bN7blyEvsvwmNr8fUFPB28n210TFW2WoUsaWbisBlgkZPfBc9rYG0fS4DpIKo7pWK/NFlt6Kfw== X-Received: by 2002:adf:ae41:: with SMTP id u1mr21558974wrd.20.1548693490439; Mon, 28 Jan 2019 08:38:10 -0800 (PST) Received: from loys-ubuntu-BY1835A49200471.thefacebook.com ([2620:10d:c092:180::1:d40b]) by smtp.googlemail.com with ESMTPSA id s3sm52388982wmj.23.2019.01.28.08.38.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 28 Jan 2019 08:38:09 -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 v3 4/4] gnss: add driver for mediatek receivers Date: Mon, 28 Jan 2019 17:38:01 +0100 Message-Id: <1548693481-1162-5-git-send-email-lollivier@baylibre.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1548693481-1162-1-git-send-email-lollivier@baylibre.com> References: <1548693481-1162-1-git-send-email-lollivier@baylibre.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 --- 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 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"); -- 2.7.4