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authorStefan Wahren <stefan.wahren@i2se.com>2019-02-22 14:45:24 +0100
committerGuenter Roeck <linux@roeck-us.net>2019-02-23 09:02:23 -0800
commitb57e1d429397217870595c80219b825d7a6db0c6 (patch)
treeaceb7b2516390f49e45c07bb8c983337830b62b4 /drivers/hwmon/pwm-fan.c
parent29d013ad04010e545f6b51f17b629e3047030105 (diff)
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>
Diffstat (limited to 'drivers/hwmon/pwm-fan.c')
-rw-r--r--drivers/hwmon/pwm-fan.c43
1 files changed, 42 insertions, 1 deletions
diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 2c944825026f..167221c7628a 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -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;