Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932238AbaLVQ33 (ORCPT ); Mon, 22 Dec 2014 11:29:29 -0500 Received: from mailout2.samsung.com ([203.254.224.25]:53663 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932200AbaLVQ3E (ORCPT ); Mon, 22 Dec 2014 11:29:04 -0500 X-AuditID: cbfee61a-f79c06d000004e71-a1-549846ce087a 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 , Abhilash Kesavan , Abhilash Kesavan , Lukasz Majewski Subject: [PATCH v2 8/8] hwmon: thermal: Code for using PWM FAN as a cooling device Date: Mon, 22 Dec 2014 17:27:48 +0100 Message-id: <1419265668-32283-9-git-send-email-l.majewski@samsung.com> X-Mailer: git-send-email 1.7.10.4 In-reply-to: <1419265668-32283-1-git-send-email-l.majewski@samsung.com> References: <1418897591-18332-1-git-send-email-l.majewski@samsung.com> <1419265668-32283-1-git-send-email-l.majewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrCLMWRmVeSWpSXmKPExsVy+t9jAd1zbjNCDL4cU7d4vGYxk8X8I+dY LeZfucZqsfTuJzaLH68vsFms+atk0bvgKpvFm0fcFm8ebma0uLxrDpvF594jjBYzzu9jsniy 8AyTxZ1pe9ksDr9pZ3Xg99g56y67x4OJu9k81k17y+yx83sDu0ffllWMHptPV3t83iQXwB7F ZZOSmpNZllqkb5fAlXFzzTv2gjlyFROf9bI2MB6U6GLk5JAQMJFY8XMJE4QtJnHh3no2EFtI YBGjxKTbQV2MXEB2F5NE17wrjCAJNgE9ic93nzKBJEQEZjBK7G/6xg7iMAtcYZb4dqqRBaRK WCBEYuneq+wgNouAqsTypy1g3bwCbhKf5r1khVinKNH9bALQOg4OTgF3id+veCG2NTNKnFrQ yDyBkXcBI8MqRtHUguSC4qT0XEO94sTc4tK8dL3k/NxNjOCwfSa1g3Flg8UhRgEORiUeXo60 6SFCrIllxZW5hxglOJiVRHivWs4IEeJNSaysSi3Kjy8qzUktPsQozcGiJM6rZN8WIiSQnliS mp2aWpBaBJNl4uCUamCcfOJ5/dNOkzNHlLwWr9ll/XVpYIze8n83r7taOrwKusNbP1lUwLGp /ezaikVLQq5pbF5h8rwufS0/t41RpJn8Vw+OuXKVZ9+yZV2sXW7bdDM4xT60ceMKe4+c9TIf 130ye8Cgek2yztRl/g+dly8NthdV1kz58VKs5X7j3twP8nz7LET7OiOUWIozEg21mIuKEwFf kEAdVwIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- Changes for v2: - Replace pwm_fan_cooling_states with pwm_fan_cooling_levels - Update ctx->pwm_fan_state when correct data from device tree is available - Using therma_cdev_update() when thermal is ready for controlling the fan --- drivers/hwmon/pwm-fan.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 83 insertions(+), 2 deletions(-) diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c index 8e68308..a47fc3c 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_levels[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_levels[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; @@ -146,8 +212,9 @@ 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; @@ -190,7 +257,21 @@ static int pwm_fan_probe(struct platform_device *pdev) return PTR_ERR(hwmon); } - pwm_fan_of_get_cooling_data(&pdev->dev, ctx); + ret = pwm_fan_of_get_cooling_data(&pdev->dev, ctx); + if (!ret) { + ctx->pwm_fan_state = ctx->pwm_fan_max_state; + 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 cooling device"); + pwm_disable(ctx->pwm); + return PTR_ERR(cdev); + } + thermal_cdev_update(cdev); + } + return 0; } -- 2.0.0.rc2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/