pwm: Add PWM framework support

[linux-2.6-block.git] / include / linux / pwm.h

diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index 7c775751392c58003a896a0c2741cb134343ce9d..1f308a13105f0d5694e43e3883ee833f4c8ba11d 100644 (file)
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -28,4 +28,42 @@ int pwm_enable(struct pwm_device *pwm);
  */
 void pwm_disable(struct pwm_device *pwm);
 
+#ifdef CONFIG_PWM
+struct pwm_chip;
+
+/**
+ * struct pwm_ops - PWM controller operations
+ * @request: optional hook for requesting a PWM
+ * @free: optional hook for freeing a PWM
+ * @config: configure duty cycles and period length for this PWM
+ * @enable: enable PWM output toggling
+ * @disable: disable PWM output toggling
+ * @owner: helps prevent removal of modules exporting active PWMs
+ */
+struct pwm_ops {
+       int                     (*request)(struct pwm_chip *chip);
+       void                    (*free)(struct pwm_chip *chip);
+       int                     (*config)(struct pwm_chip *chip, int duty_ns,
+                                               int period_ns);
+       int                     (*enable)(struct pwm_chip *chip);
+       void                    (*disable)(struct pwm_chip *chip);
+       struct module           *owner;
+};
+
+/**
+ * struct pwm_chip - abstract a PWM
+ * @pwm_id: global PWM device index
+ * @label: PWM device label
+ * @ops: controller operations
+ */
+struct pwm_chip {
+       int                     pwm_id;
+       const char              *label;
+       struct pwm_ops          *ops;
+};
+
+int pwmchip_add(struct pwm_chip *chip);
+int pwmchip_remove(struct pwm_chip *chip);
+#endif
+
 #endif /* __LINUX_PWM_H */