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Date: Thu, 26 Nov 2020 01:32:42 +0900
From: Dongjin Kim <tobetter@...il.com>
To: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Jean Delvare <jdelvare@...e.com>,
Guenter Roeck <linux@...ck-us.net>,
linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] hwmon: (pwm-fan) add fan pwm1_enable attribute
This patch adds to new attribute 'pwm1_enable' to change the fan speed
control method as documented in 'Documentation/hwmon/sysfs-interface'.
Signed-off-by: Dongjin Kim <tobetter@...il.com>
---
drivers/hwmon/pwm-fan.c | 52 ++++++++++++++++++++++++++++++++++++-----
1 file changed, 46 insertions(+), 6 deletions(-)
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 1f63807c0399..834275309421 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -39,6 +39,7 @@ struct pwm_fan_ctx {
unsigned int pwm_fan_max_state;
unsigned int *pwm_fan_cooling_levels;
struct thermal_cooling_device *cdev;
+ int enable;
};
/* This handler assumes self resetting edge triggered interrupt. */
@@ -76,6 +77,10 @@ static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm)
struct pwm_state state = { };
mutex_lock(&ctx->lock);
+
+ if (ctx->enable == 0)
+ pwm = MAX_PWM;
+
if (ctx->pwm_value == pwm)
goto exit_set_pwm_err;
@@ -137,11 +142,42 @@ static ssize_t rpm_show(struct device *dev,
return sprintf(buf, "%u\n", ctx->rpm);
}
+static ssize_t enable_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
+ int err;
+ unsigned long val;
+
+ err = kstrtoul(buf, 10, &val);
+ if (err)
+ return err;
+
+ mutex_lock(&ctx->lock);
+ ctx->enable = val;
+ mutex_unlock(&ctx->lock);
+
+ err = __set_pwm(ctx, ctx->pwm_fan_cooling_levels[ctx->pwm_fan_state]);
+
+ return err ? err : count;
+}
+
+static ssize_t enable_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%u\n", ctx->enable);
+}
+
static SENSOR_DEVICE_ATTR_RW(pwm1, pwm, 0);
+static SENSOR_DEVICE_ATTR_RW(pwm1_enable, enable, 0);
static SENSOR_DEVICE_ATTR_RO(fan1_input, rpm, 0);
static struct attribute *pwm_fan_attrs[] = {
&sensor_dev_attr_pwm1.dev_attr.attr,
+ &sensor_dev_attr_pwm1_enable.dev_attr.attr,
&sensor_dev_attr_fan1_input.dev_attr.attr,
NULL,
};
@@ -153,7 +189,7 @@ static umode_t pwm_fan_attrs_visible(struct kobject *kobj, struct attribute *a,
struct pwm_fan_ctx *ctx = dev_get_drvdata(dev);
/* Hide fan_input in case no interrupt is available */
- if (n == 1 && ctx->irq <= 0)
+ if (n == 2 && ctx->irq <= 0)
return 0;
return a->mode;
@@ -200,7 +236,7 @@ static int
pwm_fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
{
struct pwm_fan_ctx *ctx = cdev->devdata;
- int ret;
+ int ret = 0;
if (!ctx || (state > ctx->pwm_fan_max_state))
return -EINVAL;
@@ -208,10 +244,12 @@ pwm_fan_set_cur_state(struct thermal_cooling_device *cdev, unsigned long state)
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;
+ if (ctx->enable >= 2) {
+ 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;
@@ -298,6 +336,8 @@ static int pwm_fan_probe(struct platform_device *pdev)
if (IS_ERR(ctx->pwm))
return dev_err_probe(dev, PTR_ERR(ctx->pwm), "Could not get PWM\n");
+ ctx->enable = 2;
+
platform_set_drvdata(pdev, ctx);
ctx->irq = platform_get_irq_optional(pdev, 0);
--
2.25.1
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