From patchwork Thu Dec 18 10:13:09 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lukasz Majewski X-Patchwork-Id: 5512441 X-Patchwork-Delegate: eduardo.valentin@ti.com Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D99ADBEEBA for ; Thu, 18 Dec 2014 10:16:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id CFB61200CA for ; Thu, 18 Dec 2014 10:16:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DB68420A25 for ; Thu, 18 Dec 2014 10:16:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751983AbaLRKO7 (ORCPT ); Thu, 18 Dec 2014 05:14:59 -0500 Received: from mailout2.samsung.com ([203.254.224.25]:21660 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751178AbaLRKO5 (ORCPT ); Thu, 18 Dec 2014 05:14:57 -0500 Received: from epcpsbgm2.samsung.com (epcpsbgm2 [203.254.230.27]) by mailout2.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0NGR000IJWGVGRB0@mailout2.samsung.com>; Thu, 18 Dec 2014 19:14:55 +0900 (KST) X-AuditID: cbfee61b-f79d76d0000024d6-96-5492a91fcc9a Received: from epmmp2 ( [203.254.227.17]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id C0.46.09430.F19A2945; Thu, 18 Dec 2014 19:14:55 +0900 (KST) Received: from mcdsrvbld02.digital.local ([106.116.37.23]) by mmp2.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0NGR00884WE20080@mmp2.samsung.com>; Thu, 18 Dec 2014 19:14:55 +0900 (KST) From: Lukasz Majewski To: Eduardo Valentin , Kamil Debski , Jean Delvare , Guenter Roeck Cc: lm-sensors@lm-sensors.org, Linux PM list , "linux-samsung-soc@vger.kernel.org" , devicetree@vger.kernel.org, Lukasz Majewski , Kukjin Kim , linux-kernel@vger.kernel.org, Sylwester Nawrocki , Lukasz Majewski Subject: [PATCH 7/9] hwmon: thermal: Code for using PWM FAN as a cooling device Date: Thu, 18 Dec 2014 11:13:09 +0100 Message-id: <1418897591-18332-8-git-send-email-l.majewski@samsung.com> X-Mailer: git-send-email 1.7.10.4 In-reply-to: <1418897591-18332-1-git-send-email-l.majewski@samsung.com> References: <1418897591-18332-1-git-send-email-l.majewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrDLMWRmVeSWpSXmKPExsVy+t9jQV35lZNCDDbt1LWYf+Qcq8X8K9dY LZbe/cRm8eP1BTaL3gVX2SzePOK2ePNwM6PF5V1z2Cw+9x5htJhxfh+TxZOFZ5gs7kzby2Zx +E07qwOvx85Zd9k9HkzczeaxbtpbZo+d3xvYPfq2rGL02Hy62uPzJrkA9igum5TUnMyy1CJ9 uwSujO7mj+wFn6Qq7s/8ydLA+ES0i5GTQ0LARGLi3R+sELaYxIV769m6GLk4hASmM0ps2f2H CcLpYpJY/386WBWbgJ7E57tPwRIiAjMYJfY3fWMHcZgFvjNJNG1dygJSJSzgL3H00w6wDhYB VYmOCdvZQWxeATeJpuN7GSH2KUp0P5vABmJzCrhLzHkOYQuB1Py9xDyBkXcBI8MqRtHUguSC 4qT0XCO94sTc4tK8dL3k/NxNjOAwfSa9g3FVg8UhRgEORiUeXgm9SSFCrIllxZW5hxglOJiV RHijc4BCvCmJlVWpRfnxRaU5qcWHGKU5WJTEeZXs20KEBNITS1KzU1MLUotgskwcnFINjP6P wmauTWAv5nrZynt4D0P/e7M/lyx/lZ6bqsp2YLPu4ZuzBW8YyL23S2N5e33/ozlfT9nbW27S aGnJ4mXw0nLaKWKcwBXvIPCdXaPydv7cpvOha8yvXbk5RXaL3J01lp6R7cenls3p/N/qs/Dz fGPtmbpmzM/Lt/mF5bNNnXpw05Ljfx1ypyixFGckGmoxFxUnAgA21aLyTwIAAA== Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The PWM FAN device can now be used as a thermal cooling device. Necessary infrastructure has been added in this commit. Signed-off-by: Lukasz Majewski --- drivers/hwmon/pwm-fan.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 78 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c index 5854bb3..97b77e9 100644 --- a/drivers/hwmon/pwm-fan.c +++ b/drivers/hwmon/pwm-fan.c @@ -24,6 +24,7 @@ #include #include #include +#include #define MAX_PWM 255 @@ -68,6 +69,17 @@ exit_set_pwm_err: return ret; } +static void pwm_fan_update_state(struct pwm_fan_ctx *ctx, unsigned long pwm) +{ + int i; + + for (i = 0; i < ctx->pwm_fan_max_state; ++i) + if (pwm < ctx->pwm_fan_cooling_states[i + 1]) + break; + + ctx->pwm_fan_state = i; +} + static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { @@ -82,6 +94,7 @@ static ssize_t set_pwm(struct device *dev, struct device_attribute *attr, if (ret) return ret; + pwm_fan_update_state(ctx, pwm); return count; } @@ -103,6 +116,59 @@ static struct attribute *pwm_fan_attrs[] = { ATTRIBUTE_GROUPS(pwm_fan); +/* thermal cooling device callbacks */ +static int pwm_fan_get_max_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct pwm_fan_ctx *ctx = cdev->devdata; + + *state = ctx->pwm_fan_max_state; + + return 0; +} + +static int pwm_fan_get_cur_state(struct thermal_cooling_device *cdev, + unsigned long *state) +{ + struct pwm_fan_ctx *ctx = cdev->devdata; + + if (!ctx) + return -EINVAL; + + *state = ctx->pwm_fan_state; + + return 0; +} + +static int +pwm_fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state) +{ + struct pwm_fan_ctx *ctx = cdev->devdata; + int ret; + + if (!ctx || (state > ctx->pwm_fan_max_state)) + return -EINVAL; + + if (state == ctx->pwm_fan_state) + return 0; + + ret = __set_pwm(ctx, ctx->pwm_fan_cooling_states[state]); + if (ret) { + dev_err(&cdev->device, "Cannot set pwm!\n"); + return ret; + } + + ctx->pwm_fan_state = state; + + return ret; +} + +static const struct thermal_cooling_device_ops pwm_fan_cooling_ops = { + .get_max_state = pwm_fan_get_max_state, + .get_cur_state = pwm_fan_get_cur_state, + .set_cur_state = pwm_fan_set_cur_state, +}; + int pwm_fan_of_get_cooling_data(struct device *dev, struct pwm_fan_ctx *ctx) { struct device_node *np = dev->of_node; @@ -148,8 +214,9 @@ int pwm_fan_of_get_cooling_data(struct device *dev, struct pwm_fan_ctx *ctx) static int pwm_fan_probe(struct platform_device *pdev) { - struct device *hwmon; + struct thermal_cooling_device *cdev; struct pwm_fan_ctx *ctx; + struct device *hwmon; int duty_cycle; int ret; @@ -194,6 +261,16 @@ static int pwm_fan_probe(struct platform_device *pdev) pwm_disable(ctx->pwm); return PTR_ERR(hwmon); } + + cdev = thermal_of_cooling_device_register(pdev->dev.of_node, "pwm-fan", + ctx, &pwm_fan_cooling_ops); + if (IS_ERR(cdev)) { + dev_err(&pdev->dev, + "Failed to register pwm-fan as thermal cooling device"); + pwm_disable(ctx->pwm); + return PTR_ERR(cdev); + } + return 0; }