diff options
| author |   Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2011-05-20 00:40:19 -0600 |
|---|---|---|
| committer |   Grant Likely <grant.likely@secretlab.ca> | 2011-05-20 00:40:19 -0600 |
| commit | 3f397c2144e46d9127662fdb6314f21960d8563d (patch) | |
| tree | ef3401a6ac7e3b394ec10a1c586f5c1949b23edb /drivers/gpio | |
| parent | gpio/pca953x: Use handle_simple_irq instead of handle_edge_irq (diff) | |
| download | linux-dev-3f397c2144e46d9127662fdb6314f21960d8563d.tar.xz linux-dev-3f397c2144e46d9127662fdb6314f21960d8563d.zip | |
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.c | 18 |
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); |