76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
#ifndef __PWM_H
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#define __PWM_H
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struct pwm_device;
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struct device_d;
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/*
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* pwm_request - request a PWM device
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*/
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struct pwm_device *pwm_request(const char *pwmname);
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struct pwm_device *of_pwm_request(struct device_node *np, const char *con_id);
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/*
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* pwm_free - free a PWM device
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*/
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void pwm_free(struct pwm_device *pwm);
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/*
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* pwm_config - change a PWM device configuration
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*/
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int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns);
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/*
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* pwm_enable - start a PWM output toggling
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*/
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int pwm_enable(struct pwm_device *pwm);
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/*
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* pwm_disable - stop a PWM output toggling
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*/
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void pwm_disable(struct pwm_device *pwm);
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void pwm_set_period(struct pwm_device *pwm, unsigned int period);
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unsigned int pwm_get_period(struct pwm_device *pwm);
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void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty);
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unsigned int pwm_get_duty_cycle(struct pwm_device *pwm);
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struct pwm_chip;
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/**
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* struct pwm_ops - PWM operations
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* @request: optional hook for requesting a PWM
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* @free: optional hook for freeing a PWM
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* @config: configure duty cycles and period length for this PWM
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* @enable: enable PWM output toggling
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* @disable: disable PWM output toggling
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*/
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struct pwm_ops {
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int (*request)(struct pwm_chip *chip);
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void (*free)(struct pwm_chip *chip);
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int (*config)(struct pwm_chip *chip, int duty_ns,
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int period_ns);
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int (*enable)(struct pwm_chip *chip);
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void (*disable)(struct pwm_chip *chip);
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};
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/**
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* struct pwm_chip - abstract a PWM
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* @devname: unique identifier for this pwm
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* @ops: The callbacks for this PWM
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* @duty_ns: The duty cycle of the PWM, in nano-seconds
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* @period_ns: The period of the PWM, in nano-seconds
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*/
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struct pwm_chip {
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const char *devname;
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struct pwm_ops *ops;
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int duty_ns;
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int period_ns;
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};
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int pwmchip_add(struct pwm_chip *chip, struct device_d *dev);
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int pwmchip_remove(struct pwm_chip *chip);
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#endif /* __PWM_H */
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