summaryrefslogtreecommitdiff
path: root/drivers/gpio
diff options
context:
space:
mode:
authorUwe Kleine-König <u.kleine-koenig@pengutronix.de>2011-05-20 00:40:19 -0600
committerGrant Likely <grant.likely@secretlab.ca>2011-05-20 00:40:19 -0600
commit3f397c2144e46d9127662fdb6314f21960d8563d (patch)
treeef3401a6ac7e3b394ec10a1c586f5c1949b23edb /drivers/gpio
parentcc300d9ead66235e23c674babb8a4ae4ad4c9db8 (diff)
gpio: add trace events for setting direction and value
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>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c27e52b56d66..137a8ca67822 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -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);