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gpiolib: Show correct direction from the beginning

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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>
This commit is contained in:
Ricardo Ribalda Delgado 2018-10-05 08:53:00 +02:00 committed by Linus Walleij
parent 6f0ec09afe
commit 3edfb7bd76
1 changed files with 13 additions and 14 deletions
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27
drivers/gpio/gpiolib.c
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@ -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);