[1/2] pwm: Add __weak attributed functions for pwm operations

Commit Message

Mohan Pallaka March 7, 2011, 11:09 a.m. UTC

None

Patch

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 7c77575..3a8c3df 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -3,29 +3,40 @@ 
 
 struct pwm_device;
 
+/* Add __weak functions to support PWM */
+
 /*
  * pwm_request - request a PWM device
  */
-struct pwm_device *pwm_request(int pwm_id, const char *label);
+struct pwm_device __weak *pwm_request(int pwm_id, const char *label)
+{
+	return NULL;
+}
 
 /*
  * pwm_free - free a PWM device
  */
-void pwm_free(struct pwm_device *pwm);
+void __weak pwm_free(struct pwm_device *pwm) { }
 
 /*
  * pwm_config - change a PWM device configuration
  */
-int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
+int __weak pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns)
+{
+	return -ENODEV;
+}
 
 /*
  * pwm_enable - start a PWM output toggling
  */
-int pwm_enable(struct pwm_device *pwm);
+int __weak pwm_enable(struct pwm_device *pwm)
+{
+	return -EINVAL;
+}
 
 /*
  * pwm_disable - stop a PWM output toggling
  */
-void pwm_disable(struct pwm_device *pwm);
+void __weak pwm_disable(struct pwm_device *pwm) { }
 
 #endif /* __LINUX_PWM_H */