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gpio: chardev: Add helper to retrieve gpiochip and line offset by line name

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This makes the retrieval robust against chips being reordered during
boot. The results can be used to fill out mraa_pin_t while initializing
a board.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
This commit is contained in:
Jan Kiszka
2021-01-18 07:11:20 +01:00
committed by Tom Ingleby
parent fdab66958e
commit 56a11363de
2 changed files with 46 additions and 0 deletions
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2
include/gpio/gpio_chardev.h
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@@ -49,6 +49,8 @@ mraa_boolean_t mraa_is_gpio_line_open_source(mraa_gpiod_line_info *linfo);
int mraa_get_number_of_gpio_chips();
int mraa_get_chip_infos(mraa_gpiod_chip_info*** cinfos);
int mraa_find_gpio_line_by_name(const char *name, unsigned *chip_number, unsigned *line_number);
/* Multiple gpio support. */
typedef struct _gpio_group* mraa_gpiod_group_t;