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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 86F22C2BA19 for ; Tue, 21 Apr 2020 08:02:03 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 523DC2071C for ; Tue, 21 Apr 2020 08:02:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="tYPNKl7V"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=baylibre-com.20150623.gappssmtp.com header.i=@baylibre-com.20150623.gappssmtp.com header.b="XvQH49c9" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 523DC2071C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=mJaNqi/hsudd4i6Ml4rDYYIZzgYFhrEltRK0QbKRZ/I=; b=tYPNKl7VNgA6hF pco2IgreuNQHw/0Wc3x1fHzQaoh3Nsbt/f0Hhw1CRIcnTwDSsxU1m5WdWGUoXp4D1I82V34yeWujM /oeryGQrLsPJHZsKxXpuWGeOYUBchNsi1k4SdX5wFoWKptmuoYBkudQMIGf1HLs7czNtBbHGqLj41 1XyenOplXuC8EyuLCZkEicdnLLqYiA1AmDgtaApmttdeHmuMPL9y2KxYaRBWBpJXZe5S8xd5kCzAL iU3lO0VAbBP7zF71NmL5d5BFGMDmVOjC8YIsZN7u7aUKsXWSBpvPf4SXkYz939QZcG4483bSHuqSQ C5Er9Cw5MU2Md0mqGD2Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jQnqv-0001mN-QH; Tue, 21 Apr 2020 08:01:57 +0000 Received: from mail-wm1-x341.google.com ([2a00:1450:4864:20::341]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jQnqD-00019J-81 for linux-arm-kernel@lists.infradead.org; Tue, 21 Apr 2020 08:01:16 +0000 Received: by mail-wm1-x341.google.com with SMTP id u16so2529475wmc.5 for ; Tue, 21 Apr 2020 01:01:12 -0700 (PDT) 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 :mime-version:content-transfer-encoding; bh=QFz1UvHaf/QwvjUq4hk9gw50wQAtgMfi03pcCrPMxNo=; b=XvQH49c9pFBXB3qYvYNT0CIcRCWl82CkItDkzQiHosZ5ZQq3KCoglWEUw6Zdrn4QNs mPJY8YFllOVEQdw8tGrk+DtWrSk4b6mO6VI2aLk/nE/HUD1B2e4+ogwFpoIR+xBZ7hV6 QlwR0wKOiI1hkO3kUNyOW4YebTAv+U6SMEkdn1blLetMF8iyMoCqNq/fonMhp8BJNceQ SsFOtW5a8nghdMREXzTMLXVH7mv1IgeUIMb2eyoX0yXhyagQqoIyCmjobTRMmz/bpBRd KWnIhpVGJINBOeGz14jpT8qX7E+rfXNwziaCayzIphchzygTxhtqXNyiVvR55LTt/O3N Vpcw== 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=QFz1UvHaf/QwvjUq4hk9gw50wQAtgMfi03pcCrPMxNo=; b=nsiqWfg8Q7IwPyfRsUHXPkjmjr/Hoy8GYH+vTh5LFTtxkzHQkLg5mAiTamh5GCTaar xhRUkQVuDQd7LbncKIB5xNR2jhd74SA/lV3laaaZ2DRSpTNePIcdHmHQR8zVw0VeVjdU 6E7FJLGSjlpAH/NKRMLnvi3iHthyc2jUIMnyTKGQYOB/b6aeRVPnMWNwP1YGihHssEun ApAZX11aIwAC2l18HqS5nvPVv3cKgFlo1LgYSSDAFEAF0kta6bv6Gkjc3LjoT2MOdoK4 UmLbSMbYeKRFWJ2F8tw7Z0PvPH8+XYym6WsQR9mNUJGTsGQFc6OzaZaNJi5OTDGPnzoG sCcQ== X-Gm-Message-State: AGi0PuYhmwXQ5wRFNpTd9cgLO8Pvf5x8VLmA+IXEVTCSI0DFKbqCvks5 ZQek4M/jL95eL/wWpkSIr7nD1WniVTQ= X-Google-Smtp-Source: APiQypL1PXqIzzVcGO5TnXV9TKqnzS1pDGnW/BLBAQOsbzCxixg5uCIe3U5SBR1IJu+LqSNOqTp2ZA== X-Received: by 2002:a7b:c755:: with SMTP id w21mr3450621wmk.120.1587456071301; Tue, 21 Apr 2020 01:01:11 -0700 (PDT) Received: from localhost.localdomain ([2a01:e35:2ec0:82b0:39cc:a07:8b48:cc56]) by smtp.gmail.com with ESMTPSA id x132sm2561552wmg.33.2020.04.21.01.01.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Apr 2020 01:01:10 -0700 (PDT) From: Neil Armstrong To: lee.jones@linaro.org, jdelvare@suse.com, linux@roeck-us.net, srinivas.kandagatla@linaro.org Subject: [RFC 3/8] hwmon: add support for the MCU controlled FAN on Khadas boards Date: Tue, 21 Apr 2020 10:00:57 +0200 Message-Id: <20200421080102.22796-4-narmstrong@baylibre.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20200421080102.22796-1-narmstrong@baylibre.com> References: <20200421080102.22796-1-narmstrong@baylibre.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200421_010113_313279_74854D79 X-CRM114-Status: GOOD ( 18.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-hwmon@vger.kernel.org, Neil Armstrong , linux-kernel@vger.kernel.org, nick@khadas.com, linux-amlogic@lists.infradead.org, art@khadas.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org The new Khadas VIM2 and VIM3 boards controls the cooling fan via the on-board microcontroller. This implements the FAN control as HWMON devices as cell of the Khadas MCU MFD driver. Signed-off-by: Neil Armstrong --- drivers/hwmon/Kconfig | 9 ++ drivers/hwmon/Makefile | 1 + drivers/hwmon/khadas-mcu-fan.c | 230 +++++++++++++++++++++++++++++++++ 3 files changed, 240 insertions(+) create mode 100644 drivers/hwmon/khadas-mcu-fan.c diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 4c62f900bf7e..7f63ff7bb732 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -1997,6 +1997,15 @@ config SENSORS_XGENE If you say yes here you get support for the temperature and power sensors for APM X-Gene SoC. +config SENSORS_KHADAS_MCU_FAN + tristate "Khadas MCU controller FAN driver" + depends on OF || COMPILE_TEST + select MFD_CORE + select REGMAP + help + If you say yes here you get support for the FAN controlled + by the Microcontroller found on the Khadas VIM boards. + if ACPI comment "ACPI drivers" diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index b0b9c8e57176..20db40f6d57f 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -185,6 +185,7 @@ obj-$(CONFIG_SENSORS_W83L786NG) += w83l786ng.o obj-$(CONFIG_SENSORS_WM831X) += wm831x-hwmon.o obj-$(CONFIG_SENSORS_WM8350) += wm8350-hwmon.o obj-$(CONFIG_SENSORS_XGENE) += xgene-hwmon.o +obj-$(CONFIG_SENSORS_KHADAS_MCU_FAN) += khadas-mcu-fan.o obj-$(CONFIG_SENSORS_OCC) += occ/ obj-$(CONFIG_PMBUS) += pmbus/ diff --git a/drivers/hwmon/khadas-mcu-fan.c b/drivers/hwmon/khadas-mcu-fan.c new file mode 100644 index 000000000000..dd92b2bcb7e3 --- /dev/null +++ b/drivers/hwmon/khadas-mcu-fan.c @@ -0,0 +1,230 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Khadas MCU Controlled FAN driver + * + * Copyright (C) 2020 BayLibre SAS + * Author(s): Neil Armstrong + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MAX_LEVEL 3 + +struct khadas_mcu_fan_ctx { + struct khadas_mcu *mcu; + unsigned int level; + struct thermal_cooling_device *cdev; +}; + +static int khadas_mcu_fan_set_level(struct khadas_mcu_fan_ctx *ctx, + unsigned int level) +{ + int ret; + + ret = regmap_write(ctx->mcu->map, KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG, + level); + if (ret) + return ret; + + ctx->level = level; + + return 0; +} + +static ssize_t level_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev); + unsigned long level; + int ret; + + if (kstrtoul(buf, 10, &level) || level > MAX_LEVEL) + return -EINVAL; + + ret = khadas_mcu_fan_set_level(ctx, level); + if (ret < 0) + return ret; + + return count; +} + +static ssize_t level_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev); + + return sprintf(buf, "%u\n", ctx->level); +} + +static SENSOR_DEVICE_ATTR_RW(level1, level, 0); + +static struct attribute *khadas_mcu_fan_attrs[] = { + &sensor_dev_attr_level1.dev_attr.attr, + NULL, +}; + +static const struct attribute_group khadas_mcu_fan_group = { + .attrs = khadas_mcu_fan_attrs, +}; + +static const struct attribute_group *khadas_mcu_fan_groups[] = { + &khadas_mcu_fan_group, + NULL, +}; + +/* thermal cooling device callbacks */ +static int khadas_mcu_fan_get_max_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct khadas_mcu_fan_ctx *ctx = cdev->devdata; + + if (!ctx) + return -EINVAL; + + *state = MAX_LEVEL; + + return 0; +} + +static int khadas_mcu_fan_get_cur_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct khadas_mcu_fan_ctx *ctx = cdev->devdata; + + if (!ctx) + return -EINVAL; + + *state = ctx->level; + + return 0; +} + +static int +khadas_mcu_fan_set_cur_state(struct thermal_cooling_device *cdev, + unsigned long state) +{ + struct khadas_mcu_fan_ctx *ctx = cdev->devdata; + + if (!ctx || (state > MAX_LEVEL)) + return -EINVAL; + + if (state == ctx->level) + return 0; + + return khadas_mcu_fan_set_level(ctx, state); +} + +static const struct thermal_cooling_device_ops khadas_mcu_fan_cooling_ops = { + .get_max_state = khadas_mcu_fan_get_max_state, + .get_cur_state = khadas_mcu_fan_get_cur_state, + .set_cur_state = khadas_mcu_fan_set_cur_state, +}; + +static int khadas_mcu_fan_probe(struct platform_device *pdev) +{ + struct khadas_mcu *mcu = dev_get_drvdata(pdev->dev.parent); + struct thermal_cooling_device *cdev; + struct device *dev = &pdev->dev; + struct khadas_mcu_fan_ctx *ctx; + struct device *hwmon; + int ret; + + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + ctx->mcu = mcu; + platform_set_drvdata(pdev, ctx); + + hwmon = devm_hwmon_device_register_with_groups(dev, "khadas-mcu-fan", + ctx, + khadas_mcu_fan_groups); + if (IS_ERR(hwmon)) { + dev_err(dev, "Failed to register hwmon device\n"); + return PTR_ERR(hwmon); + } + + if (IS_ENABLED(CONFIG_THERMAL)) { + cdev = devm_thermal_of_cooling_device_register(dev->parent, + dev->parent->of_node, "khadas-mcu-fan", ctx, + &khadas_mcu_fan_cooling_ops); + if (IS_ERR(cdev)) { + ret = PTR_ERR(cdev); + dev_err(dev, + "Failed to register khadas-mcu-fan as cooling device: %d\n", + ret); + return ret; + } + ctx->cdev = cdev; + thermal_cdev_update(cdev); + } + + return 0; +} + +static int khadas_mcu_fan_disable(struct device *dev) +{ + struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev); + unsigned int level_save = ctx->level; + int ret; + + ret = khadas_mcu_fan_set_level(ctx, 0); + if (ret) + return ret; + + ctx->level = level_save; + + return 0; +} + +static void khadas_mcu_fan_shutdown(struct platform_device *pdev) +{ + khadas_mcu_fan_disable(&pdev->dev); +} + +#ifdef CONFIG_PM_SLEEP +static int khadas_mcu_fan_suspend(struct device *dev) +{ + return khadas_mcu_fan_disable(dev); +} + +static int khadas_mcu_fan_resume(struct device *dev) +{ + struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev); + + return khadas_mcu_fan_set_level(ctx, ctx->level); +} +#endif + +static SIMPLE_DEV_PM_OPS(khadas_mcu_fan_pm, khadas_mcu_fan_suspend, + khadas_mcu_fan_resume); + +static const struct platform_device_id khadas_mcu_fan_id_table[] = { + { .name = "khadas-mcu-fan-ctrl", }, + {}, +}; +MODULE_DEVICE_TABLE(platform, khadas_mcu_fan_id_table); + +static struct platform_driver khadas_mcu_fan_driver = { + .probe = khadas_mcu_fan_probe, + .shutdown = khadas_mcu_fan_shutdown, + .driver = { + .name = "khadas-mcu-fan-ctrl", + .pm = &khadas_mcu_fan_pm, + }, + .id_table = khadas_mcu_fan_id_table, +}; + +module_platform_driver(khadas_mcu_fan_driver); + +MODULE_AUTHOR("Neil Armstrong "); +MODULE_DESCRIPTION("Khadas MCU FAN driver"); +MODULE_LICENSE("GPL"); -- 2.22.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel