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hwmon: (pwm-fan) Add optional regulator support 

This adds optional regulator support to the pwm-fan driver. This is
necessary for pwm fans which are powered by a switchable supply.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Stefan Wahren 2019-02-22 14:45:24 +01:00 committed by Guenter Roeck
parent 29d013ad04
commit b57e1d4293
1 changed files with 42 additions and 1 deletions
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43
drivers/hwmon/pwm-fan.c
View File

@ -23,6 +23,7 @@
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/regulator/consumer.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>
@ -31,6 +32,7 @@
struct pwm_fan_ctx {
struct mutex lock;
struct pwm_device *pwm;
struct regulator *reg_en;
unsigned int pwm_value;
unsigned int pwm_fan_state;
unsigned int pwm_fan_max_state;
@ -231,6 +233,21 @@ static int pwm_fan_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, ctx);
ctx->reg_en = devm_regulator_get_optional(&pdev->dev, "fan");
if (IS_ERR(ctx->reg_en)) {
if (PTR_ERR(ctx->reg_en) != -ENODEV)
return PTR_ERR(ctx->reg_en);
ctx->reg_en = NULL;
} else {
ret = regulator_enable(ctx->reg_en);
if (ret) {
dev_err(&pdev->dev,
"Failed to enable fan supply: %d\n", ret);
return ret;
}
}
ctx->pwm_value = MAX_PWM;
/* Set duty cycle to maximum allowed and enable PWM output */
@ -241,7 +258,7 @@ static int pwm_fan_probe(struct platform_device *pdev)
ret = pwm_apply_state(ctx->pwm, &state);
if (ret) {
dev_err(&pdev->dev, "Failed to configure PWM\n");
return ret;
goto err_reg_disable;
}
hwmon = devm_hwmon_device_register_with_groups(&pdev->dev, "pwmfan",
@ -277,6 +294,10 @@ err_pwm_disable:
state.enabled = false;
pwm_apply_state(ctx->pwm, &state);
err_reg_disable:
if (ctx->reg_en)
regulator_disable(ctx->reg_en);
return ret;
}
@ -287,6 +308,10 @@ static int pwm_fan_remove(struct platform_device *pdev)
thermal_cooling_device_unregister(ctx->cdev);
if (ctx->pwm_value)
pwm_disable(ctx->pwm);
if (ctx->reg_en)
regulator_disable(ctx->reg_en);
return 0;
}
@ -307,6 +332,14 @@ static int pwm_fan_suspend(struct device *dev)
pwm_disable(ctx->pwm);
}
if (ctx->reg_en) {
ret = regulator_disable(ctx->reg_en);
if (ret) {
dev_err(dev, "Failed to disable fan supply: %d\n", ret);
return ret;
}
}
return 0;
}
@ -317,6 +350,14 @@ static int pwm_fan_resume(struct device *dev)
unsigned long duty;
int ret;
if (ctx->reg_en) {
ret = regulator_enable(ctx->reg_en);
if (ret) {
dev_err(dev, "Failed to enable fan supply: %d\n", ret);
return ret;
}
}
if (ctx->pwm_value == 0)
return 0;