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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 BAEB9C4727E for ; Thu, 24 Sep 2020 19:27:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7251922208 for ; Thu, 24 Sep 2020 19:27:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=gmx.net header.i=@gmx.net header.b="CnuJOq1P" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728853AbgIXT1e (ORCPT ); Thu, 24 Sep 2020 15:27:34 -0400 Received: from mout.gmx.net ([212.227.17.22]:39661 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728780AbgIXT1e (ORCPT ); Thu, 24 Sep 2020 15:27:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1600975615; bh=kPZl/L/V+lSOt6mdHEUfQyfNZV+P9p8a2y5WBNQYGEY=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=CnuJOq1PXtORLWkaiIZ4QmI99dW2FHYWzW06NlKEat5l5gU2bNrFlwTdbcdomeOQZ XsoiyuPtx3Te0JCEZDVplBzV/JD/bJ33Z+rmnYZcxGVO4zER+PJLJsaCzbzI447Bos tGA9z8CeZsRUD7pTNBG/ywaKY2lxIkY5gpstQAdM= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from longitude ([5.146.195.151]) by mail.gmx.com (mrgmx104 [212.227.17.168]) with ESMTPSA (Nemesis) id 1Mt79F-1kb0RK27mT-00tSos; Thu, 24 Sep 2020 21:26:55 +0200 From: =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= To: linux-kernel@vger.kernel.org Cc: Lee Jones , Rob Herring , =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= , Thierry Reding , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Alessandro Zummo , Alexandre Belloni , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Sam Ravnborg , Linus Walleij , Heiko Stuebner , Stephan Gerhold , Lubomir Rintel , Mark Brown , allen , Mauro Carvalho Chehab , "David S. Miller" , devicetree@vger.kernel.org, linux-pwm@vger.kernel.org, linux-rtc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Heiko Stuebner , Josua Mayer , Andreas Kemnade , Arnd Bergmann , Daniel Palmer , Andy Shevchenko Subject: [PATCH v3 4/7] pwm: ntxec: Add driver for PWM function in Netronix EC Date: Thu, 24 Sep 2020 21:24:52 +0200 Message-Id: <20200924192455.2484005-5-j.neuschaefer@gmx.net> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200924192455.2484005-1-j.neuschaefer@gmx.net> References: <20200924192455.2484005-1-j.neuschaefer@gmx.net> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:mA3DG95xvQs2E54phiN9UBrtsp5UQWCBcYtK0cDi5xTJIhrE7ca vOEVh1mJnsGPvkFa0F5MikCjzc8AwjM4UI8W8Vmgrxyu8QJiYq/N7gvynIzFtFChzWaruhW ZBXLRIYiD57d7jEONSAXLmkBXa2WEHh32mKgHDZlItmSli1saRUm0NiQPmmforFMoZBX94V ZZYKSV0uM/rfexOlRbbRA== X-UI-Out-Filterresults: notjunk:1;V03:K0:WYsN+KbUPa4=:n/AuxUCEn0gediIuwxzYTw IU9V261xJuG28lzmMETl5WXmTtBlhHN96Lhs8K9w90KnbEBbPo6tbcR93PH3Jnbb9NOvAgRRG +hfcPwwbHwrp7y6G0fdNkLKOA6xNvxnOQTCcULB4//6Hfq/Nq/PcGmKR/qweowraNOr12dtXt ZNbEg6iuTe7iHgBn0y1yDzx10Pc39Ty3fqjBvtTzW0pypGWfqF9ct8w1UjrlbdBFVrUK5DxgZ aQ5AMkl5I+SptjFFab/T88CR2+cQvbVzjIAljsZYaW1wcGCKhUi+NhA8e4Ni185gmdbeem8FB Xmp0lId9WZbioquUhvDNcrznEdN8SyEwFcOas1chAPRLASKtNdy+S+Gz7vzSG3AqId0vuJskT QZ260hFBnHQmkkXsF2/wJi5hiplr20SIH+BIBp7HYIohnDAlorkpnlMd87fNSMX49ajllRhuh AOGtZxCutuWTVbE5f2t0PtbxLAehn6VCXy29GDXBFShlT8/+mMk7unb6oidFJxGUuxAGdeW9G gD8bbfGm8zGqhExrqtoTQ8TrsLwrlkD7PDE7yPI94EWYY3YdG88p+opZkJEehytnbvPahUe2+ wa7SeDmv5n86l3mtmzK7+307h3VwiDI3XRSFTgMVlbQGs7Mfvk94Tih/M5AFJ1MXdqLIycWZA kZvU9ujSi+PLjOSFTQ/kdV94S0pJnoyfpgsS0ahXh2UotQHwJt9dwxbfFEcvhi1XW9qVWorIJ K+xfz5HLm23fPTB3DkVWfuEx8c+67hXBfyebxYIYQbKMbh+R1dviJsLjsXFt01mHxleoHlP77 hLVcMoI41UCm4OmI/j5obNsdRLhY14nCOJeF5biRLRb+eQowd34ruNN1kgA9DL8TnUToBn7U4 IFnSnAU1F38j7SO7Nv1nD3T97MEFGlN63AyFejPVcqPuWeXTEBG3j3VuFzzOAipR85AfGKlsh wuHpaJWaS9eO4VbeUW1CD9xbQyMAHa7AJupqmJ2GYiqUaXaKf1B9Eg39NuSVh7EMjXTWeqGie kxtQ2iHCNW/rPdBol56kwQlr6W/dwCKspCH1o7B/kxcrWbXMNvwiCXYTnp9g4i//F2yYxi/JN esFXVvfjvTqK8DcZVcjY4xXjKbiZWN53q6aI8WFEfJI4Sfuq/WO7vM+HStH/TJTUsKQzM8NwR 4MhvoS9qbDMYH5kHwGsjPAvWUtNFgup0toUdvGuJdJXrM9uQBeIpnWg2i+gWn0sfUCmvblTKx 5QUG/ARAZkqs6C5QIIchQ026KIvxFLSLFDXK5bw== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The Netronix EC provides a PWM output which is used for the backlight on some ebook readers. This patches adds a driver for the PWM output. The .get_state callback is not implemented, because the PWM state can't be read back from the hardware. Signed-off-by: Jonathan Neusch=C3=A4fer =2D-- v3: - Relicense as GPLv2 or later - Add email address to copyright line - Remove OF compatible string and don't include linux/of_device.h - Fix bogus ?: in return line - Don't use a comma after sentinels - Avoid ret |=3D ... pattern - Move 8-bit register conversion to ntxec.h v2: - https://lore.kernel.org/lkml/20200905133230.1014581-6-j.neuschaefer@gmx.= net/ - Various grammar and style improvements, as suggested by Uwe Kleine-K=C3= =B6nig, Lee Jones, and Alexandre Belloni - Switch to regmap - Prefix registers with NTXEC_REG_ - Add help text to the Kconfig option - Use the .apply callback instead of the old API - Add a #define for the time base (125ns) - Don't change device state in .probe; this avoids multiple problems - Rework division and overflow check logic to perform divisions in 32 bits - Avoid setting duty cycle to zero, to work around a hardware quirk =2D-- drivers/pwm/Kconfig | 8 ++ drivers/pwm/Makefile | 1 + drivers/pwm/pwm-ntxec.c | 161 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 170 insertions(+) create mode 100644 drivers/pwm/pwm-ntxec.c diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig index 7dbcf6973d335..530dfda38d65e 100644 =2D-- a/drivers/pwm/Kconfig +++ b/drivers/pwm/Kconfig @@ -350,6 +350,14 @@ config PWM_MXS To compile this driver as a module, choose M here: the module will be called pwm-mxs. +config PWM_NTXEC + tristate "Netronix embedded controller PWM support" + depends on MFD_NTXEC + help + Say yes here if you want to support the PWM output of the embedded + controller found in certain e-book readers designed by the ODM + Netronix. + config PWM_OMAP_DMTIMER tristate "OMAP Dual-Mode Timer PWM support" depends on OF diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile index 2c2ba0a035577..1cc50dba22d1b 100644 =2D-- a/drivers/pwm/Makefile +++ b/drivers/pwm/Makefile @@ -32,6 +32,7 @@ obj-$(CONFIG_PWM_MESON) +=3D pwm-meson.o obj-$(CONFIG_PWM_MEDIATEK) +=3D pwm-mediatek.o obj-$(CONFIG_PWM_MTK_DISP) +=3D pwm-mtk-disp.o obj-$(CONFIG_PWM_MXS) +=3D pwm-mxs.o +obj-$(CONFIG_PWM_NTXEC) +=3D pwm-ntxec.o obj-$(CONFIG_PWM_OMAP_DMTIMER) +=3D pwm-omap-dmtimer.o obj-$(CONFIG_PWM_PCA9685) +=3D pwm-pca9685.o obj-$(CONFIG_PWM_PXA) +=3D pwm-pxa.o diff --git a/drivers/pwm/pwm-ntxec.c b/drivers/pwm/pwm-ntxec.c new file mode 100644 index 0000000000000..50da2dc14bb03 =2D-- /dev/null +++ b/drivers/pwm/pwm-ntxec.c @@ -0,0 +1,161 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * The Netronix embedded controller is a microcontroller found in some + * e-book readers designed by the ODM Netronix, Inc. It contains RTC, + * battery monitoring, system power management, and PWM functionality. + * + * This driver implements PWM output. + * + * Copyright 2020 Jonathan Neusch=C3=A4fer + */ + +#include +#include +#include +#include +#include +#include + +struct ntxec_pwm { + struct device *dev; + struct ntxec *ec; + struct pwm_chip chip; +}; + +static struct ntxec_pwm *pwmchip_to_pwm(struct pwm_chip *chip) +{ + return container_of(chip, struct ntxec_pwm, chip); +} + +#define NTXEC_REG_AUTO_OFF_HI 0xa1 +#define NTXEC_REG_AUTO_OFF_LO 0xa2 +#define NTXEC_REG_ENABLE 0xa3 +#define NTXEC_REG_PERIOD_LOW 0xa4 +#define NTXEC_REG_PERIOD_HIGH 0xa5 +#define NTXEC_REG_DUTY_LOW 0xa6 +#define NTXEC_REG_DUTY_HIGH 0xa7 + +/* + * The time base used in the EC is 8MHz, or 125ns. Period and duty cycle = are + * measured in this unit. + */ +#define TIME_BASE_NS 125 + +/* + * The maximum input value (in nanoseconds) is determined by the time bas= e and + * the range of the hardware registers that hold the converted value. + * It fits into 32 bits, so we can do our calculations in 32 bits as well= . + */ +#define MAX_PERIOD_NS (TIME_BASE_NS * 0x10000 - 1) + +static int ntxec_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm_= dev, + const struct pwm_state *state) +{ + struct ntxec_pwm *pwm =3D pwmchip_to_pwm(pwm_dev->chip); + unsigned int duty =3D state->duty_cycle; + unsigned int period =3D state->period; + int res =3D 0; + + if (period > MAX_PERIOD_NS) { + dev_warn(pwm->dev, + "Period is not representable in 16 bits after division by %u: %u\n", + TIME_BASE_NS, period); + return -ERANGE; + } + + period /=3D TIME_BASE_NS; + duty /=3D TIME_BASE_NS; + + res =3D regmap_write(pwm->ec->regmap, NTXEC_REG_PERIOD_HIGH, ntxec_reg8(= period >> 8)); + if (res) + return res; + + res =3D regmap_write(pwm->ec->regmap, NTXEC_REG_PERIOD_LOW, ntxec_reg8(p= eriod)); + if (res) + return res; + + res =3D regmap_write(pwm->ec->regmap, NTXEC_REG_DUTY_HIGH, ntxec_reg8(du= ty >> 8)); + if (res) + return res; + + res =3D regmap_write(pwm->ec->regmap, NTXEC_REG_DUTY_LOW, ntxec_reg8(dut= y)); + if (res) + return res; + + /* + * Writing a duty cycle of zone puts the device into a state where + * writing a higher duty cycle doesn't result in the brightness that it + * usually results in. This can be fixed by cycling the ENABLE register. + * + * As a workaround, write ENABLE=3D0 when the duty cycle is zero. + */ + if (state->enabled && duty !=3D 0) { + res =3D regmap_write(pwm->ec->regmap, NTXEC_REG_ENABLE, ntxec_reg8(1)); + if (res) + return res; + + /* Disable the auto-off timer */ + res =3D regmap_write(pwm->ec->regmap, NTXEC_REG_AUTO_OFF_HI, ntxec_reg8= (0xff)); + if (res) + return res; + + return regmap_write(pwm->ec->regmap, NTXEC_REG_AUTO_OFF_LO, ntxec_reg8(= 0xff)); + } else { + return regmap_write(pwm->ec->regmap, NTXEC_REG_ENABLE, ntxec_reg8(0)); + } +} + +static struct pwm_ops ntxec_pwm_ops =3D { + .apply =3D ntxec_pwm_apply, + .owner =3D THIS_MODULE, +}; + +static int ntxec_pwm_probe(struct platform_device *pdev) +{ + struct ntxec *ec =3D dev_get_drvdata(pdev->dev.parent); + struct ntxec_pwm *pwm; + struct pwm_chip *chip; + int res; + + pwm =3D devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL); + if (!pwm) + return -ENOMEM; + + pwm->ec =3D ec; + pwm->dev =3D &pdev->dev; + + chip =3D &pwm->chip; + chip->dev =3D &pdev->dev; + chip->ops =3D &ntxec_pwm_ops; + chip->base =3D -1; + chip->npwm =3D 1; + + res =3D pwmchip_add(chip); + if (res < 0) + return res; + + platform_set_drvdata(pdev, pwm); + + return 0; +} + +static int ntxec_pwm_remove(struct platform_device *pdev) +{ + struct ntxec_pwm *pwm =3D platform_get_drvdata(pdev); + struct pwm_chip *chip =3D &pwm->chip; + + return pwmchip_remove(chip); +} + +static struct platform_driver ntxec_pwm_driver =3D { + .driver =3D { + .name =3D "ntxec-pwm", + }, + .probe =3D ntxec_pwm_probe, + .remove =3D ntxec_pwm_remove, +}; +module_platform_driver(ntxec_pwm_driver); + +MODULE_AUTHOR("Jonathan Neusch=C3=A4fer "); +MODULE_DESCRIPTION("PWM driver for Netronix EC"); +MODULE_LICENSE("GPL"); =2D- 2.28.0 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=-12.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,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 622D1C4727D for ; 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