pwm: Add sysfs interface

[linux-2.6-block.git] / drivers / pwm / core.c

diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index 0cf0f65eb037ad20ad750dac4c5cbf0b1ab4f73c..dfbfbc5217683de697d1c834f73c55de0ff850de 100644 (file)
--- 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);