Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 3f397c21 authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Grant Likely
Browse files

gpio: add trace events for setting direction and value 



This patch allows to trace gpio operations using ftrace

Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent cc300d9e

drivers/gpio/gpiolib.c

+16 −2
Original line number Diff line number Diff line
@@ -12,6 +12,8 @@ 
#include <linux/idr.h>

#include <linux/slab.h>



#define CREATE_TRACE_POINTS

#include <trace/events/gpio.h>



/* Optional implementation infrastructure for GPIO interfaces.

 *
@@ -1405,6 +1407,8 @@ int gpio_direction_input(unsigned gpio) 
	status = chip->direction_input(chip, gpio);

	if (status == 0)

		clear_bit(FLAG_IS_OUT, &desc->flags);



	trace_gpio_direction(chip->base + gpio, 1, status);

lose:

	return status;

fail:
@@ -1458,6 +1462,8 @@ int gpio_direction_output(unsigned gpio, int value) 
	status = chip->direction_output(chip, gpio, value);

	if (status == 0)

		set_bit(FLAG_IS_OUT, &desc->flags);

	trace_gpio_value(chip->base + gpio, 0, value);

	trace_gpio_direction(chip->base + gpio, 0, status);

lose:

	return status;

fail:
@@ -1547,10 +1553,13 @@ EXPORT_SYMBOL_GPL(gpio_set_debounce); 
int __gpio_get_value(unsigned gpio)

{

	struct gpio_chip	*chip;

	int value;



	chip = gpio_to_chip(gpio);

	WARN_ON(chip->can_sleep);

	return chip->get ? chip->get(chip, gpio - chip->base) : 0;

	value = chip->get ? chip->get(chip, gpio - chip->base) : 0;

	trace_gpio_value(gpio, 1, value);

	return value;

}

EXPORT_SYMBOL_GPL(__gpio_get_value);
@@ -1569,6 +1578,7 @@ void __gpio_set_value(unsigned gpio, int value) 


	chip = gpio_to_chip(gpio);

	WARN_ON(chip->can_sleep);

	trace_gpio_value(gpio, 0, value);

	chip->set(chip, gpio - chip->base, value);

}

EXPORT_SYMBOL_GPL(__gpio_set_value);
@@ -1619,10 +1629,13 @@ EXPORT_SYMBOL_GPL(__gpio_to_irq); 
int gpio_get_value_cansleep(unsigned gpio)

{

	struct gpio_chip	*chip;

	int value;



	might_sleep_if(extra_checks);

	chip = gpio_to_chip(gpio);

	return chip->get ? chip->get(chip, gpio - chip->base) : 0;

	value = chip->get ? chip->get(chip, gpio - chip->base) : 0;

	trace_gpio_value(gpio, 1, value);

	return value;

}

EXPORT_SYMBOL_GPL(gpio_get_value_cansleep);
@@ -1632,6 +1645,7 @@ void gpio_set_value_cansleep(unsigned gpio, int value) 


	might_sleep_if(extra_checks);

	chip = gpio_to_chip(gpio);

	trace_gpio_value(gpio, 0, value);

	chip->set(chip, gpio - chip->base, value);

}

EXPORT_SYMBOL_GPL(gpio_set_value_cansleep);

include/trace/events/gpio.h

0 → 100644
+56 −0
Original line number Diff line number Diff line 
#undef TRACE_SYSTEM

#define TRACE_SYSTEM gpio



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

#define _TRACE_GPIO_H



#include <linux/tracepoint.h>



TRACE_EVENT(gpio_direction,



	TP_PROTO(unsigned gpio, int in, int err),



	TP_ARGS(gpio, in, err),



	TP_STRUCT__entry(

		__field(unsigned, gpio)

		__field(int, in)

		__field(int, err)

	),



	TP_fast_assign(

		__entry->gpio = gpio;

		__entry->in = in;

		__entry->err = err;

	),



	TP_printk("%u %3s (%d)", __entry->gpio,

		__entry->in ? "in" : "out", __entry->err)

);



TRACE_EVENT(gpio_value,



	TP_PROTO(unsigned gpio, int get, int value),



	TP_ARGS(gpio, get, value),



	TP_STRUCT__entry(

		__field(unsigned, gpio)

		__field(int, get)

		__field(int, value)

	),



	TP_fast_assign(

		__entry->gpio = gpio;

		__entry->get = get;

		__entry->value = value;

	),



	TP_printk("%u %3s %d", __entry->gpio,

		__entry->get ? "get" : "set", __entry->value)

);



#endif /* if !defined(_TRACE_GPIO_H) || defined(TRACE_HEADER_MULTI_READ) */



/* This part must be outside protection */

#include <trace/define_trace.h>