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gpio: add advanced open functions for cdev implementation

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resolves #22.
This commit is contained in:
Vanya A. Sergeev
2020-05-28 20:35:06 -05:00
parent 0f20c96265
commit 7e7b91ac90
4 changed files with 142 additions and 23 deletions
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docs/gpio.md
+42
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@@ -11,6 +11,8 @@ GPIO wrapper functions for Linux userspace character device `gpio-cdev` and sysf
gpio_t *gpio_new(void);
int gpio_open(gpio_t *gpio, const char *path, unsigned int line, gpio_direction_t direction);
int gpio_open_name(gpio_t *gpio, const char *path, const char *name, gpio_direction_t direction);
int gpio_open_advanced(gpio_t *gpio, const char *path, unsigned int line, const gpio_config_t *config);
int gpio_open_name_advanced(gpio_t *gpio, const char *path, const char *name, const gpio_config_t *config);
int gpio_open_sysfs(gpio_t *gpio, unsigned int line, gpio_direction_t direction);
int gpio_read(gpio_t *gpio, bool *value);
int gpio_write(gpio_t *gpio, bool value);
@@ -111,6 +113,46 @@ Returns 0 on success, or a negative [GPIO error code](#return-value) on failure.
------
``` c
typedef struct gpio_config {
gpio_direction_t direction;
gpio_edge_t edge;
gpio_bias_t bias;
gpio_drive_t drive;
bool inverted;
const char *label;
} gpio_config_t;
int gpio_open_advanced(gpio_t *gpio, const char *path, unsigned int line, const gpio_config_t *config);
```
Open the character device GPIO with the specified GPIO line and configuration at the specified character device GPIO chip path (e.g. `/dev/gpiochip0`).
`gpio` should be a valid pointer to an allocated GPIO handle structure. `path` is the GPIO chip character device path. `line` is the GPIO line number. `config` should be a valid pointer to a `gpio_config_t` structure with valid values. `label` can be `NULL` for a default consumer label.
Returns 0 on success, or a negative [GPIO error code](#return-value) on failure.
------
``` c
typedef struct gpio_config {
gpio_direction_t direction;
gpio_edge_t edge;
gpio_bias_t bias;
gpio_drive_t drive;
bool inverted;
const char *label;
} gpio_config_t;
int gpio_open_name_advanced(gpio_t *gpio, const char *path, const char *name, const gpio_config_t *config);
```
Open the character device GPIO with the specified GPIO name and configuration at the specified character device GPIO chip path (e.g. `/dev/gpiochip0`).
`gpio` should be a valid pointer to an allocated GPIO handle structure. `path` is the GPIO chip character device path. `name` is the GPIO line name. `config` should be a valid pointer to a `gpio_config_t` structure with valid values. `label` can be `NULL` for a default consumer label.
Returns 0 on success, or a negative [GPIO error code](#return-value) on failure.
------
``` c
int gpio_open_sysfs(gpio_t *gpio, unsigned int line, gpio_direction_t direction);
```