Commit 1188829a authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Thierry Reding
Browse files

pwm: Implement tracing for .get_state() and .apply_state() 



This allows to log all calls to the driver's lowlevel functions which
simplifies debugging in some cases.

Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent af4fab8b

drivers/pwm/core.c

+8 −1
Original line number Diff line number Diff line
@@ -20,6 +20,9 @@ 


#include <dt-bindings/pwm/pwm.h>



#define CREATE_TRACE_POINTS

#include <trace/events/pwm.h>



#define MAX_PWMS 1024



static DEFINE_MUTEX(pwm_lookup_lock);
@@ -114,8 +117,10 @@ static int pwm_device_request(struct pwm_device *pwm, const char *label) 
		}

	}



	if (pwm->chip->ops->get_state)

	if (pwm->chip->ops->get_state) {

		pwm->chip->ops->get_state(pwm->chip, pwm, &pwm->state);

		trace_pwm_get(pwm, &pwm->state);

	}



	set_bit(PWMF_REQUESTED, &pwm->flags);

	pwm->label = label;
@@ -472,6 +477,8 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state) 
		if (err)

			return err;



		trace_pwm_apply(pwm, state);



		pwm->state = *state;

	} else {

		/*

include/trace/events/pwm.h

0 → 100644
+58 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0-or-later */

#undef TRACE_SYSTEM

#define TRACE_SYSTEM pwm



#if !defined(_TRACE_PWM_H) || defined(TRACE_HEADER_MULTI_READ)

#define _TRACE_PWM_H



#include <linux/pwm.h>

#include <linux/tracepoint.h>



DECLARE_EVENT_CLASS(pwm,



	TP_PROTO(struct pwm_device *pwm, const struct pwm_state *state),



	TP_ARGS(pwm, state),



	TP_STRUCT__entry(

		__field(struct pwm_device *, pwm)

		__field(u64, period)

		__field(u64, duty_cycle)

		__field(enum pwm_polarity, polarity)

		__field(bool, enabled)

	),



	TP_fast_assign(

		__entry->pwm = pwm;

		__entry->period = state->period;

		__entry->duty_cycle = state->duty_cycle;

		__entry->polarity = state->polarity;

		__entry->enabled = state->enabled;

	),



	TP_printk("%p: period=%llu duty_cycle=%llu polarity=%d enabled=%d",

		  __entry->pwm, __entry->period, __entry->duty_cycle,

		  __entry->polarity, __entry->enabled)



);



DEFINE_EVENT(pwm, pwm_apply,



	TP_PROTO(struct pwm_device *pwm, const struct pwm_state *state),



	TP_ARGS(pwm, state)



);



DEFINE_EVENT(pwm, pwm_get,



	TP_PROTO(struct pwm_device *pwm, const struct pwm_state *state),



	TP_ARGS(pwm, state)



);



#endif /* _TRACE_PWM_H */



/* This part must be outside protection */

#include <trace/define_trace.h>