Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753927AbbBYPfQ (ORCPT ); Wed, 25 Feb 2015 10:35:16 -0500 Received: from mailout3.samsung.com ([203.254.224.33]:19511 "EHLO mailout3.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753885AbbBYPfK (ORCPT ); Wed, 25 Feb 2015 10:35:10 -0500 X-AuditID: cbfee61a-f79c06d000004e71-06-54edebab7c5f From: Lukasz Majewski To: Eduardo Valentin , Kamil Debski , Jean Delvare , Guenter Roeck , Kukjin Kim 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, Sjoerd Simons , Abhilash Kesavan , Abhilash Kesavan , Lukasz Majewski Subject: [PATCH v5 6/6] hwmon: pwm-fan: Code for using PWM FAN as a cooling device Date: Wed, 25 Feb 2015 16:34:22 +0100 Message-id: <1424878462-15511-7-git-send-email-l.majewski@samsung.com> X-Mailer: git-send-email 1.7.10.4 In-reply-to: <1424878462-15511-1-git-send-email-l.majewski@samsung.com> References: <1418897591-18332-1-git-send-email-l.majewski@samsung.com> <1424878462-15511-1-git-send-email-l.majewski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrCLMWRmVeSWpSXmKPExsVy+t9jAd3Vr9+GGNx+ZWzxeM1iJov5R86x Wsy/co3VYundT2wWP15fYLNY81fJonfBVTaL/sevmS3ePOK2ePNwM6PF5V1z2Cw+9x5htJhx fh+TxZOFZ5gs7kzby2Yx/fhbVgcBj7/Pr7N47Jx1l91j06pONo8HE3ezeayb9pbZY+f3BnaP vi2rGD02n672+LxJLoAzissmJTUnsyy1SN8ugSvjX/d2poKNChV/1i9mbWCcL9XFyMkhIWAi cWXuU2YIW0ziwr31bF2MXBxCAosYJf7eesUM4XQxSTTNvcUIUsUmoCfx+e5TJpCEiMB2RokV 876BtTALXGOW2Lf5KBNIlbBAiETT2sdACQ4OFgFVieM7C0DCvAJuEq9fnWKBWKco0f1sAhuI zSngLjH3zXN2iG3NjBK3Lk5jnsDIu4CRYRWjaGpBckFxUnquoV5xYm5xaV66XnJ+7iZGcFg/ k9rBuLLB4hCjAAejEg9vgvCbECHWxLLiytxDjBIczEoivK1n34YI8aYkVlalFuXHF5XmpBYf YpTmYFES51WybwsREkhPLEnNTk0tSC2CyTJxcEo1MPr7+UmuWzFr/8UV8Svl92ya8fz8JiP5 hHX9xh4CXDtmr7sjNblAzKu3KbO8O3SHvAWPeNfkB/dK7zy41FH2KPKm7reCr4+nClZcuup3 JcdmwaI9qYo9uUohEQ92sS6J/nBsHsfMtFWnC/ZmdaRmbLhqyuJpdXNb36Gddz6oqivx/cs9 ESu/47ISS3FGoqEWc1FxIgAfDTL7ZwIAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4234 Lines: 161 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 Changes for v3: - Rename patch heading - pwm_fan_of_get_cooling_data() now returns -EINVAL when no "cooling-levels" property defined - register of cooling device only when proper cooling data is present Changes for v4: - None Changes for v5: - Check for IS_ENABLED(CONFIG_THERMAL) has been added to prevent from executing thermal_* specific functions --- drivers/hwmon/pwm-fan.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 82 insertions(+), 1 deletion(-) diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c index e6ed353..2c1a8f0 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; @@ -145,8 +211,9 @@ 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; @@ -193,6 +260,20 @@ static int pwm_fan_probe(struct platform_device *pdev) if (ret) return ret; + ctx->pwm_fan_state = ctx->pwm_fan_max_state; + if (IS_ENABLED(CONFIG_THERMAL)) { + 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/