litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'include/linux/prefetch.h')

0 files changed, 0 insertions, 0 deletions

#ifndef __LINUX_PWM_H #define __LINUX_PWM_H #include <linux/err.h> #include <linux/of.h> struct pwm_device; struct seq_file; #if IS_ENABLED(CONFIG_PWM) || IS_ENABLED(CONFIG_HAVE_PWM) /* * pwm_request - request a PWM device */ struct pwm_device *pwm_request(int pwm_id, const char *label); /* * pwm_free - free a PWM device */ void 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); /* * pwm_enable - start a PWM output toggling */ int pwm_enable(struct pwm_device *pwm); /* * pwm_disable - stop a PWM output toggling */ void pwm_disable(struct pwm_device *pwm); #else static inline struct pwm_device *pwm_request(int pwm_id, const char *label) { return ERR_PTR(-ENODEV); } static inline void pwm_free(struct pwm_device *pwm) { } static inline int pwm_config(struct pwm_device *pwm, int duty_ns, int period_ns) { return -EINVAL; } static inline int pwm_enable(struct pwm_device *pwm) { return -EINVAL; } static inline void pwm_disable(struct pwm_device *pwm) { } #endif struct pwm_chip; /** * enum pwm_polarity - polarity of a PWM signal * @PWM_POLARITY_NORMAL: a high signal for the duration of the duty- * cycle, followed by a low signal for the remainder of the pulse * period * @PWM_POLARITY_INVERSED: a low signal for the duration of the duty- * cycle, followed by a high signal for the remainder of the pulse * period */ enum pwm_polarity { PWM_POLARITY_NORMAL, PWM_POLARITY_INVERSED, }; enum { PWMF_REQUESTED = 1 << 0, PWMF_ENABLED = 1 << 1, PWMF_EXPORTED = 1 << 2, }; struct pwm_device { const char *label; unsigned long flags; unsigned int hwpwm; unsigned int pwm; struct pwm_chip *chip; void *chip_data; unsigned int period; /* in nanoseconds */ unsigned int duty_cycle; /* in nanoseconds */ enum pwm_polarity polarity; }; static inline void pwm_set_period(struct pwm_device *pwm, unsigned int period) { if (pwm) pwm->period = period; } static inline unsigned int pwm_get_period(struct pwm_device *pwm) { return pwm ? pwm->period : 0; } static inline void pwm_set_duty_cycle(struct pwm_device *pwm, unsigned int duty) { if (pwm) pwm->duty_cycle = duty; } static inline unsigned int pwm_get_duty_cycle(struct pwm_device *pwm) { return pwm ? pwm->duty_cycle : 0; } /* * pwm_set_polarity - configure the polarity of a PWM signal */ int pwm_set_polarity(struct pwm_device *pwm, enum pwm_polarity polarity); /** * 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 * @set_polarity: configure the polarity of this PWM * @enable: enable PWM output toggling * @disable: disable PWM output toggling * @dbg_show: optional routine to show contents in debugfs * @owner: helps prevent removal of modules exporting active PWMs */ struct pwm_ops { int (*request)(struct pwm_chip *chip, struct pwm_device *pwm); void (*free)(struct pwm_chip *chip, struct pwm_device *pwm); int (*config)(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns); int (*set_polarity)(struct pwm_chip *chip, struct pwm_device *pwm, enum pwm_polarity polarity); int (*enable)(struct pwm_chip *chip, struct pwm_device *pwm); void (*disable)(struct pwm_chip *chip, struct pwm_device *pwm); #ifdef CONFIG_DEBUG_FS void (*dbg_show)(struct pwm_chip *chip, struct seq_file *s); #endif struct module *owner;


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