als.h File Reference

#include <stdbool.h>
#include <stdint.h>
#include <pbl/device.h>
#include <pbl/kernel/mutex.h>

Data Structures
struct	pbl_als_scale
	Raw count to lux calibration: lux = (raw - offset) * num / den. More...
struct	pbl_als_ops
	Ambient light sensor driver operations, called with the device lock held. More...
struct	pbl_als_state
	Ambient light sensor runtime state. More...
struct	pbl_als
	Ambient light sensor. More...

Macros
#define	PBL_ALS_STATE_DEFINE(sym)
	Define the class state of an ambient light sensor.
#define	PBL_ALS_INIT(sym, _name, _parent, _ops, _scale)
	Initialize a struct pbl_als.

Functions
int	pbl_als_read (const struct pbl_als *als, uint32_t *level)
	Read the light level.
void	pbl_als_prime (const struct pbl_als *als)
	Announce that readings will be wanted soon.
void	pbl_als_release (const struct pbl_als *als)
	Drop a reference taken with pbl_als_prime().
void	pbl_als_suspend (const struct pbl_als *als)
	Stop sampling until the matching pbl_als_resume().
void	pbl_als_resume (const struct pbl_als *als)
	Drop a reference taken with pbl_als_suspend().
bool	pbl_als_has_lux (const struct pbl_als *als)
	Check whether the sensor is calibrated to lux.
uint32_t	pbl_als_to_lux (const struct pbl_als *als, uint32_t level)
	Convert a light level to lux.

Variables
static const uint32_t	AMBIENT_LIGHT_LEVEL_MAX = (1U << CONFIG_AMBIENT_LIGHT_BITS)
	Upper bound of the raw light level scale (CONFIG_AMBIENT_LIGHT_BITS bits).
const struct pbl_als *const	ALS
	The board's ambient light sensor.