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pwmvar.h revision 1.1.2.2 
      1 /* $NetBSD: pwmvar.h,v 1.1.2.2 2018/05/21 04:36:12 pgoyette Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2018 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #ifndef _DEV_PWM_PWMVAR_H
     30 #define _DEV_PWM_PWMVAR_H
     31 
     32 enum pwm_polarity {
     33 	PWM_ACTIVE_HIGH,
     34 	PWM_ACTIVE_LOW
     35 };
     36 
     37 struct pwm_config {
     38 	u_int	period;			/* nanoseconds */
     39 	u_int	duty_cycle;		/* nanoseconds */
     40 	enum pwm_polarity polarity;	/* PWM_ACTIVE_{HIGH,LOW} */
     41 };
     42 
     43 typedef struct pwm_controller {
     44 	int	(*pwm_enable)(struct pwm_controller *, bool);
     45 	int	(*pwm_get_config)(struct pwm_controller *,
     46 				  struct pwm_config *);
     47 	int	(*pwm_set_config)(struct pwm_controller *,
     48 				  const struct pwm_config *);
     49 
     50 	device_t pwm_dev;		/* device */
     51 	void	*pwm_priv;		/* driver private data */
     52 } *pwm_tag_t;
     53 
     54 int	pwm_enable(pwm_tag_t);
     55 int	pwm_disable(pwm_tag_t);
     56 int	pwm_get_config(pwm_tag_t, struct pwm_config *);
     57 int	pwm_set_config(pwm_tag_t, const struct pwm_config *);
     58 
     59 #endif /* _DEV_PWM_PWMVAR_H */
     60