From patchwork Thu Sep 19 00:54:56 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ayman Bagabas X-Patchwork-Id: 11151373 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 23436112B for ; Thu, 19 Sep 2019 00:56:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EA36D20882 for ; Thu, 19 Sep 2019 00:56:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="nCv6QQB9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731204AbfISA4R (ORCPT ); Wed, 18 Sep 2019 20:56:17 -0400 Received: from mail-yb1-f193.google.com ([209.85.219.193]:41183 "EHLO mail-yb1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730468AbfISA4R (ORCPT ); Wed, 18 Sep 2019 20:56:17 -0400 Received: by mail-yb1-f193.google.com with SMTP id x4so701509ybo.8; Wed, 18 Sep 2019 17:56:15 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=R49NnZsyUkXF2Xu3sJjr0TF8Quw2fhv4Xl+NuImfZd4=; b=nCv6QQB9DLA04Jwn9p2G+No4cJTG5hwuk9pbgYv/LgcYD4DDjUbVTZX55hE0RpV1rA WV8LOrBUMNY2hbO/VTFQRTFoZbhjZDGeBtch2cPsJyfxZEhKH9/CDlZTsLfdem3py/Y1 PGxDYwsn++g3dCa7foKN4FwSK9YxvTH30Oa28cwkgL6Nb4ExhaZB94jES0GkqXnbHypC vnIypa04plakbsjR0Agomnvk6BxuM51R7r9DIYS2Uo1VGT4SG4Zwso5qEHFbtwrcKRMb buD5V10MM7+YnE0aY4+SmOc58sua43u3CWJ+dBIDlXIvfXDUt3BgrkFPTcub6L090DxW Xo2g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=R49NnZsyUkXF2Xu3sJjr0TF8Quw2fhv4Xl+NuImfZd4=; b=ro4q7XItbLgDZIwnFAcM2BADUIo5SNHU5N3yDiXC63OolpW6JKjv1cO3Yd9A4wcphE jZUFfEfBLQHQ+gtVtYZ+2gH5cFtlvlnT+rR/5IMFbCB/vfWUIofkPeYtJnjtuKGpOLUG NmGXdTHOQeUj2KSzZPUKD/nMuE+KdCCvgeTWgRg9scR8B01664ejMreY8utHMV2TMikh dsz6tOMO2IboYujmP4gZBpAG4ZfssNfGtysRGDV6aSpdLBx6d00QFTbJsK6oCUbgTIpv A0+bKxFuMlywofzKfKmq94URnDLEPNcjdE/dw1TmlW8yq2R2B2HJKXuOAN8JvlPCbIEI BtNQ== X-Gm-Message-State: APjAAAXJVl+exzh3ajtNhKFtKLN7eJSWmo/wz2dxlLWmiDB+LtJ+PA1i +d6pY9U4ioVhC9KbwXtE7g== X-Google-Smtp-Source: APXvYqwmb63PRHqwCeYev0+KmuLMSeGydnrIlcKIMRzeLb4bkbdFfYZNfmpSibs/FVI/uoSToJliNQ== X-Received: by 2002:a25:d181:: with SMTP id i123mr42436ybg.362.1568854575156; Wed, 18 Sep 2019 17:56:15 -0700 (PDT) Received: from 960.localdomain ([64.192.53.12]) by smtp.gmail.com with ESMTPSA id u69sm1692475ywu.93.2019.09.18.17.56.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Sep 2019 17:56:14 -0700 (PDT) From: Ayman Bagabas To: Darren Hart , Andy Shevchenko , Ayman Bagabas , Mattias Jacobsson <2pi@mok.nu>, Takashi Iwai , platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 4/6] platform/x86: huawei-wmi: Add battery charging thresholds Date: Wed, 18 Sep 2019 20:54:56 -0400 Message-Id: <20190919005505.23822-5-ayman.bagabas@gmail.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190919005505.23822-1-ayman.bagabas@gmail.com> References: <20190919005505.23822-1-ayman.bagabas@gmail.com> MIME-Version: 1.0 Sender: platform-driver-x86-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org Controll battery charge thresholds through the battery API and driver's attributes. Setting battery charging thresholds can introduce a race condition with MACH-WX9 where two or more threads are trying to read/write values from/to EC memory. Signed-off-by: Ayman Bagabas --- drivers/platform/x86/huawei-wmi.c | 212 ++++++++++++++++++++++++++++++ 1 file changed, 212 insertions(+) diff --git a/drivers/platform/x86/huawei-wmi.c b/drivers/platform/x86/huawei-wmi.c index 904ef38944b6..231b5cce00db 100644 --- a/drivers/platform/x86/huawei-wmi.c +++ b/drivers/platform/x86/huawei-wmi.c @@ -6,6 +6,7 @@ */ #include +#include #include #include #include @@ -13,7 +14,10 @@ #include #include #include +#include +#include #include +#include /* * Huawei WMI GUIDs @@ -54,11 +58,14 @@ struct huawei_wmi_debug { }; struct huawei_wmi { + bool battery_available; + struct huawei_wmi_debug debug; struct input_dev *idev[2]; struct led_classdev cdev; struct platform_device *pdev; + struct mutex battery_lock; struct mutex wmi_lock; }; @@ -306,6 +313,208 @@ static void huawei_wmi_leds_setup(struct device *dev) devm_led_classdev_register(dev, &huawei->cdev); } +/* Battery protection */ + +static int huawei_wmi_battery_get(int *start, int *end) +{ + u8 ret[0x100]; + int err, i; + + err = huawei_wmi_cmd(BATTERY_THRESH_GET, ret, 0x100); + if (err) + return err; + + /* Find the last two non-zero values. Return status is ignored. */ + i = 0x100; + do { + if (start) + *start = ret[i-1]; + if (end) + *end = ret[i]; + } while (i > 2 && !ret[i--]); + + return 0; +} + +static int huawei_wmi_battery_set(int start, int end) +{ + union hwmi_arg arg; + int err; + + if (start < 0 || end > 100) + return -EINVAL; + + arg.cmd = BATTERY_THRESH_SET; + arg.args[2] = start; + arg.args[3] = end; + + /* This is an edge case were some models turn battery protection + * off without changing their thresholds values. We clear the + * values before turning off protection. Sometimes we need a sleep delay to + * make sure these values make their way to EC memory. + */ + if (quirks && quirks->battery_reset && start == 0 && end == 100) { + err = huawei_wmi_battery_set(0, 0); + if (err) + return err; + + msleep(1000); + } + + err = huawei_wmi_cmd(arg.cmd, NULL, NULL); + + return err; +} + +static ssize_t charge_control_start_threshold_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int err, start; + + err = huawei_wmi_battery_get(&start, NULL); + if (err) + return err; + + return sprintf(buf, "%d\n", start); +} + +static ssize_t charge_control_end_threshold_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int err, end; + + err = huawei_wmi_battery_get(NULL, &end); + if (err) + return err; + + return sprintf(buf, "%d\n", end); +} + +static ssize_t charge_control_thresholds_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + int err, start, end; + + err = huawei_wmi_battery_get(&start, &end); + if (err) + return err; + + return sprintf(buf, "%d %d\n", start, end); +} + +static ssize_t charge_control_start_threshold_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int err, start, end; + + err = huawei_wmi_battery_get(NULL, &end); + if (err) + return err; + + if (sscanf(buf, "%d", &start) != 1) + return -EINVAL; + + err = huawei_wmi_battery_set(start, end); + if (err) + return err; + + return size; +} + +static ssize_t charge_control_end_threshold_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int err, start, end; + + err = huawei_wmi_battery_get(&start, NULL); + if (err) + return err; + + if (sscanf(buf, "%d", &end) != 1) + return -EINVAL; + + err = huawei_wmi_battery_set(start, end); + if (err) + return err; + + return size; +} + +static ssize_t charge_control_thresholds_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int err, start, end; + + if (sscanf(buf, "%d %d", &start, &end) != 2) + return -EINVAL; + + err = huawei_wmi_battery_set(start, end); + if (err) + return err; + + return size; +} + +static DEVICE_ATTR_RW(charge_control_start_threshold); +static DEVICE_ATTR_RW(charge_control_end_threshold); +static DEVICE_ATTR_RW(charge_control_thresholds); + +static int huawei_wmi_battery_add(struct power_supply *battery) +{ + /* Huawei laptops come with one battery only */ + if (strcmp(battery->desc->name, "BAT") != 1) + return -ENODEV; + + device_create_file(&battery->dev, &dev_attr_charge_control_start_threshold); + device_create_file(&battery->dev, &dev_attr_charge_control_end_threshold); + + return 0; +} + +static int huawei_wmi_battery_remove(struct power_supply *battery) +{ + device_remove_file(&battery->dev, &dev_attr_charge_control_start_threshold); + device_remove_file(&battery->dev, &dev_attr_charge_control_end_threshold); + + return 0; +} + +static struct acpi_battery_hook huawei_wmi_battery_hook = { + .add_battery = huawei_wmi_battery_add, + .remove_battery = huawei_wmi_battery_remove, + .name = "Huawei Battery Extension" +}; + +static void huawei_wmi_battery_setup(struct device *dev) +{ + struct huawei_wmi *huawei = dev_get_drvdata(dev); + + huawei->battery_available = true; + if (huawei_wmi_battery_get(NULL, NULL)) { + huawei->battery_available = false; + return; + } + + battery_hook_register(&huawei_wmi_battery_hook); + device_create_file(dev, &dev_attr_charge_control_thresholds); +} + +static void huawei_wmi_battery_exit(struct device *dev) +{ + struct huawei_wmi *huawei = dev_get_drvdata(dev); + + if (huawei->battery_available) { + battery_hook_unregister(&huawei_wmi_battery_hook); + device_remove_file(dev, &dev_attr_charge_control_thresholds); + } +} + /* Input */ static void huawei_wmi_process_key(struct input_dev *idev, int code) @@ -426,8 +635,10 @@ static int huawei_wmi_probe(struct platform_device *pdev) if (wmi_has_guid(HWMI_METHOD_GUID)) { mutex_init(&huawei_wmi->wmi_lock); + mutex_init(&huawei_wmi->battery_lock); huawei_wmi_leds_setup(&pdev->dev); + huawei_wmi_battery_setup(&pdev->dev); } return 0; @@ -445,6 +656,7 @@ static int huawei_wmi_remove(struct platform_device *pdev) } if (wmi_has_guid(HWMI_METHOD_GUID)) { + huawei_wmi_battery_exit(&pdev->dev); } return 0;