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gpio: add trace events for setting direction and value

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This patch allows to trace gpio operations using ftrace

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Uwe Kleine-König 2011-05-20 00:40:19 -06:00 committed by Grant Likely
parent cc300d9ead
commit 3f397c2144
2 changed files with 72 additions and 2 deletions
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18
drivers/gpio/gpiolib.c
View File

@ -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);

56
include/trace/events/gpio.h Normal file
View File

@ -0,0 +1,56 @@
#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>