From patchwork Sun Aug 23 14:08:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Osipenko X-Patchwork-Id: 255448 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=-12.6 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 C428CC433DF for ; Sun, 23 Aug 2020 14:10:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 997942078D for ; Sun, 23 Aug 2020 14:10:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="A3ankdiX" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727018AbgHWOKK (ORCPT ); Sun, 23 Aug 2020 10:10:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33546 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726961AbgHWOKF (ORCPT ); Sun, 23 Aug 2020 10:10:05 -0400 Received: from mail-lj1-x241.google.com (mail-lj1-x241.google.com [IPv6:2a00:1450:4864:20::241]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A6AF1C061573; Sun, 23 Aug 2020 07:10:04 -0700 (PDT) Received: by mail-lj1-x241.google.com with SMTP id i10so6748868ljn.2; Sun, 23 Aug 2020 07:10:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=IrKpeaWDCIbs0elrD0ervQn0EwoALOJQTmF6gmGudwk=; b=A3ankdiXKQcXxNVb464Y9CSK8uZmn/v7wkTOr8ZC32VSlRfBoFrDH9dldQUNZ7q0db be4up2EcJQJBIdQQz9wiwmaqw3OWktrzv2EWG6NF8TEhxszYwHIYQHWbNrGRy7yXxsxj lwljaYDN0oder2d2R+V/5pkX7BJBeiYRdExzhzeNnEuBvxypdCPmh6zhNzDv1iB5KMHe Y9x88UI5AEnSAelmciveimSf60PLvJtOj6Sp40TlaKfppYSiiTU2lNiyyyAVkK+0XMn4 VX2XrODp+74zcfNE8IdwYMb/Y5OfIBRzLTT3ea1lZxvDnKTMHsQhEBTBBdNZIiwGElyX 556A== 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:mime-version:content-transfer-encoding; bh=IrKpeaWDCIbs0elrD0ervQn0EwoALOJQTmF6gmGudwk=; b=eWkZsLwWWhXzjx93r90U9S37Oh1HdLfjisGd3I8WyipTAk1Mzc2XAP1pDzuUHCL5Kl 9muzBfsqyDMO81MKnlIvCTv0yhkeuq5oKFX+V8HDHs3Grz80JjKEiCtApyUDsZHxmdqb 3uXdz0AijQgwMfJpS+a4EZ7cu4VWzUy25j3rhdvIb6u6MtXGX/Seb5MDY94HRYg1eULf Fb8TLlFrtMYE8Lh4GaWisiqQZ5xxTrw5nOZnJmhqMy4te2Qi2L3+mrIDHX3/649ItmNy QUX4unH5bB1AdELWTdp6daBnu1IJNpYXjCSt8RJ//4oaIBuKzLoxBnLd/u7WxCvUDZ/5 TZlw== X-Gm-Message-State: AOAM532DiR321wedcAM0wvR+vnKMpQSMpiOgpwuvnGY59vBdp2h4uO1z qsbLY1oztMsadOPduU7X7+0= X-Google-Smtp-Source: ABdhPJwekZiY1NZHt+Cdvdzj6xO2L+gKT49464XJ7ZAmN4KyeCBtxLFZpi+kAiwchVtaC4TrvVludg== X-Received: by 2002:a2e:80c9:: with SMTP id r9mr626731ljg.95.1598191803007; Sun, 23 Aug 2020 07:10:03 -0700 (PDT) Received: from localhost.localdomain (109-252-170-211.dynamic.spd-mgts.ru. [109.252.170.211]) by smtp.gmail.com with ESMTPSA id b17sm1641342ljp.9.2020.08.23.07.10.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 23 Aug 2020 07:10:02 -0700 (PDT) From: Dmitry Osipenko To: Lee Jones , Rob Herring , Thierry Reding , Jonathan Hunter , Pavel Machek , Dan Murphy , Sebastian Reichel , Lubomir Rintel Cc: devicetree@vger.kernel.org, linux-tegra@vger.kernel.org, linux-leds@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v1 3/6] leds: Add driver for Acer Iconia Tab A500 Date: Sun, 23 Aug 2020 17:08:43 +0300 Message-Id: <20200823140846.19299-4-digetx@gmail.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200823140846.19299-1-digetx@gmail.com> References: <20200823140846.19299-1-digetx@gmail.com> MIME-Version: 1.0 Sender: linux-leds-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-leds@vger.kernel.org Acer Iconia Tab A500 is an Android tablet device which has two LEDs embedded into the Power Button. Orange LED indicates "battery charging" status and white LED indicates "wake-up/charge-done" status. The new LED driver provides control over both LEDs to userspace. Signed-off-by: Dmitry Osipenko --- drivers/leds/Kconfig | 7 ++ drivers/leds/Makefile | 1 + drivers/leds/leds-acer-a500.c | 121 ++++++++++++++++++++++++++++++++++ 3 files changed, 129 insertions(+) create mode 100644 drivers/leds/leds-acer-a500.c diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index 4f6464a169d5..4c39b53bcf1f 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -921,6 +921,13 @@ config LEDS_SGM3140 This option enables support for the SGM3140 500mA Buck/Boost Charge Pump LED Driver. +config LEDS_ACER_A500 + tristate "Power button LED support for Acer Iconia Tab A500" + depends on LEDS_CLASS && MFD_ACER_A500_EC + help + This option enables support for the Power Button LED of + Acer Iconia Tab A500. + comment "LED Triggers" source "drivers/leds/trigger/Kconfig" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 778cb4bb8c52..73e603e1727e 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_LEDS_TRIGGERS) += led-triggers.o # LED Platform Drivers (keep this sorted, M-| sort) obj-$(CONFIG_LEDS_88PM860X) += leds-88pm860x.o obj-$(CONFIG_LEDS_AAT1290) += leds-aat1290.o +obj-$(CONFIG_LEDS_ACER_A500) += leds-acer-a500.o obj-$(CONFIG_LEDS_ADP5520) += leds-adp5520.o obj-$(CONFIG_LEDS_AN30259A) += leds-an30259a.o obj-$(CONFIG_LEDS_APU) += leds-apu.o diff --git a/drivers/leds/leds-acer-a500.c b/drivers/leds/leds-acer-a500.c new file mode 100644 index 000000000000..65e69a40a91a --- /dev/null +++ b/drivers/leds/leds-acer-a500.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Power button LED driver for Acer Iconia Tab A500. + * + * Copyright 2020 GRATE-driver project. + */ + +#include +#include +#include + +#include + +struct a500_ec_led { + struct led_classdev cdev; + struct a500_ec_led *other_led; + const struct a500_ec_cmd *cmd; +}; + +/* cmd delay ms */ +A500_EC_COMMAND(RESET_LEDS, 0x40, 100); +A500_EC_COMMAND(POWER_LED_ON, 0x42, 100); +A500_EC_COMMAND(CHARGE_LED_ON, 0x43, 100); +A500_EC_COMMAND(ANDROID_LEDS_OFF, 0x5A, 100); + +static int a500_ec_led_brightness_set(struct led_classdev *led_cdev, + enum led_brightness value) +{ + struct device *a500_ec_leds_dev = led_cdev->dev->parent; + struct a500_ec *ec_chip = dev_get_drvdata(a500_ec_leds_dev->parent); + struct a500_ec_led *led = container_of(led_cdev, struct a500_ec_led, + cdev); + int ret; + + a500_ec_lock(ec_chip); + + if (value) { + ret = a500_ec_write_locked(ec_chip, led->cmd, 0); + } else { + /* + * There is no separate controls which can disable LEDs + * individually, there is only RESET_LEDS command that turns + * off both LEDs. + */ + ret = a500_ec_write_locked(ec_chip, RESET_LEDS, 0); + if (ret) + goto unlock; + + led = led->other_led; + + /* RESET_LEDS turns off both LEDs, thus restore other LED */ + if (led->cdev.brightness == LED_ON) + ret = a500_ec_write_locked(ec_chip, led->cmd, 0); + } + +unlock: + a500_ec_unlock(ec_chip); + + return ret; +} + +static int a500_ec_leds_probe(struct platform_device *pdev) +{ + struct a500_ec *ec_chip = dev_get_drvdata(pdev->dev.parent); + struct a500_ec_led *white_led, *orange_led; + int err; + + /* reset and turn off all LEDs */ + a500_ec_write(ec_chip, RESET_LEDS, 0); + a500_ec_write(ec_chip, ANDROID_LEDS_OFF, 0); + + white_led = devm_kzalloc(&pdev->dev, sizeof(*white_led), GFP_KERNEL); + if (!white_led) + return -ENOMEM; + + white_led->cdev.name = "power-button-white"; + white_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set; + white_led->cdev.flags = LED_CORE_SUSPENDRESUME; + white_led->cdev.max_brightness = LED_ON; + white_led->cmd = &A500_EC_POWER_LED_ON; + + orange_led = devm_kzalloc(&pdev->dev, sizeof(*orange_led), GFP_KERNEL); + if (!orange_led) + return -ENOMEM; + + orange_led->cdev.name = "power-button-orange"; + orange_led->cdev.brightness_set_blocking = a500_ec_led_brightness_set; + orange_led->cdev.flags = LED_CORE_SUSPENDRESUME; + orange_led->cdev.max_brightness = LED_ON; + orange_led->cmd = &A500_EC_CHARGE_LED_ON; + + white_led->other_led = orange_led; + orange_led->other_led = white_led; + + err = devm_led_classdev_register(&pdev->dev, &white_led->cdev); + if (err) { + dev_err(&pdev->dev, "failed to register white LED\n"); + return err; + } + + err = devm_led_classdev_register(&pdev->dev, &orange_led->cdev); + if (err) { + dev_err(&pdev->dev, "failed to register orange LED\n"); + return err; + } + + return 0; +} + +static struct platform_driver a500_ec_leds_driver = { + .driver = { + .name = "acer-a500-iconia-leds", + }, + .probe = a500_ec_leds_probe, +}; +module_platform_driver(a500_ec_leds_driver); + +MODULE_DESCRIPTION("LED driver for Acer Iconia Tab A500 Power Button"); +MODULE_AUTHOR("Dmitry Osipenko "); +MODULE_ALIAS("platform:acer-a500-iconia-leds"); +MODULE_LICENSE("GPL v2");