1 files changed, 23 insertions, 2 deletions

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 0cf0f65eb037..dfbfbc521768 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -274,6 +274,8 @@ int pwmchip_add(struct pwm_chip *chip)
         if (IS_ENABLED(CONFIG_OF))
                 of_pwmchip_add(chip);
 
+        pwmchip_sysfs_export(chip);
+
 out:
         mutex_unlock(&pwm_lock);
         return ret;
@@ -310,6 +312,8 @@ int pwmchip_remove(struct pwm_chip *chip)
 
         free_pwms(chip);
 
+        pwmchip_sysfs_unexport(chip);
+
 out:
         mutex_unlock(&pwm_lock);
         return ret;
@@ -402,10 +406,19 @@ EXPORT_SYMBOL_GPL(pwm_free);
  */
 int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
 {
+        int err;
+
         if (!pwm || duty_ns < 0 || period_ns <= 0 || duty_ns > period_ns)
                 return -EINVAL;
 
-        return pwm->chip->ops->config(pwm->chip, pwm, duty_ns, period_ns);
+        err = pwm->chip->ops->config(pwm->chip, pwm, duty_ns, period_ns);
+        if (err)
+                return err;
+
+        pwm->duty_cycle = duty_ns;
+        pwm->period = period_ns;
+
+        return 0;
 }
 EXPORT_SYMBOL_GPL(pwm_config);
 
@@ -418,6 +431,8 @@ EXPORT_SYMBOL_GPL(pwm_config);
  */
 int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity)
 {
+        int err;
+
         if (!pwm || !pwm->chip->ops)
                 return -EINVAL;
 
@@ -427,7 +442,13 @@ int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity)
         if (test_bit(PWMF_ENABLED, &pwm->flags))
                 return -EBUSY;
 
-        return pwm->chip->ops->set_polarity(pwm->chip, pwm, polarity);
+        err = pwm->chip->ops->set_polarity(pwm->chip, pwm, polarity);
+        if (err)
+                return err;
+
+        pwm->polarity = polarity;
+
+        return 0;
 }
 EXPORT_SYMBOL_GPL(pwm_set_polarity);