diff options
| author | Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> | 2018-10-05 08:53:00 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-10-10 10:32:00 +0200 |
| commit | 3edfb7bd76bd1cba6b917736943dffd799deed8a (patch) | |
| tree | e136cfbf483987ea7a488d40ac05a63fdafcc031 | |
| parent | 6f0ec09afe278ea2a5d63f31b754db6655c69078 (diff) | |
| download | linux-3edfb7bd76bd1cba6b917736943dffd799deed8a.tar.bz2 | |
gpiolib: Show correct direction from the beginning
Current code assumes that the direction is input if direction_input
function is set.
This might not be the case on GPIOs with programmable direction.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Tested-by: Jeffrey Hugo <jhugo@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
| -rw-r--r-- | drivers/gpio/gpiolib.c | 27 |
1 files changed, 13 insertions, 14 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index b66aae75223b..16ab167717dc 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1351,20 +1351,6 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, spin_unlock_irqrestore(&gpio_lock, flags); - for (i = 0; i < chip->ngpio; i++) { - struct gpio_desc *desc = &gdev->descs[i]; - - desc->gdev = gdev; - - /* REVISIT: most hardware initializes GPIOs as inputs (often - * with pullups enabled) so power usage is minimized. Linux - * code should set the gpio direction first thing; but until - * it does, and in case chip->get_direction is not set, we may - * expose the wrong direction in sysfs. - */ - desc->flags = !chip->direction_input ? (1 << FLAG_IS_OUT) : 0; - } - #ifdef CONFIG_PINCTRL INIT_LIST_HEAD(&gdev->pin_ranges); #endif @@ -1393,6 +1379,19 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data, if (status) goto err_remove_chip; + for (i = 0; i < chip->ngpio; i++) { + struct gpio_desc *desc = &gdev->descs[i]; + + desc->gdev = gdev; + + if (chip->get_direction && gpiochip_line_is_valid(chip, i)) + desc->flags = !chip->get_direction(chip, i) ? + (1 << FLAG_IS_OUT) : 0; + else + desc->flags = !chip->direction_input ? + (1 << FLAG_IS_OUT) : 0; + } + acpi_gpiochip_add(chip); machine_gpiochip_add(chip); |