diff options
author | Stefan Wahren <stefan.wahren@i2se.com> | 2019-02-22 14:45:24 +0100 |
---|---|---|
committer | Guenter Roeck <linux@roeck-us.net> | 2019-02-23 09:02:23 -0800 |
commit | b57e1d429397217870595c80219b825d7a6db0c6 (patch) | |
tree | aceb7b2516390f49e45c07bb8c983337830b62b4 | |
parent | 29d013ad04010e545f6b51f17b629e3047030105 (diff) | |
download | linux-b57e1d429397217870595c80219b825d7a6db0c6.tar.bz2 |
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>
-rw-r--r-- | drivers/hwmon/pwm-fan.c | 43 |
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; |