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/* GPIOLIB interface implementation
*
* COPYRIGHT (c) 2009.
* Cobham Gaisler AB.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <gpiolib.h>
struct gpiolib_port;
struct gpiolib_port {
struct gpiolib_port *next;
int minor;
struct gpiolib_drv *drv;
void *handle;
int open;
};
/* Root of GPIO Ports */
struct gpiolib_port *gpiolib_ports;
/* Number of GPIO ports registered */
static int port_nr;
/* 1 if libraray initialized */
static int gpiolib_initied = 0;
/* Insert a port first in ports list */
static void gpiolib_list_add(struct gpiolib_port *port)
{
port->next = gpiolib_ports;
gpiolib_ports = port;
}
static struct gpiolib_port *gpiolib_find(int minor)
{
struct gpiolib_port *p;
p = gpiolib_ports;
while ( p && (p->minor != minor) ) {
p = p->next;
}
return p;
}
static struct gpiolib_port *gpiolib_find_by_name(char *name)
{
struct gpiolib_port *p;
struct gpiolib_info info;
int (*get_info)(void *, struct gpiolib_info *);
p = gpiolib_ports;
while ( p ) {
get_info = p->drv->ops->get_info;
if ( get_info && (get_info(p->handle, &info) == 0) ) {
if ( strncmp(name, (char *)&info.devName[0], 64) == 0 ) {
break;
}
}
p = p->next;
}
return p;
}
int gpiolib_drv_register(struct gpiolib_drv *drv, void *handle)
{
struct gpiolib_port *port;
if ( !drv || !drv->ops )
return -1;
port = malloc(sizeof(*port));
if ( port == NULL )
return -1;
memset(port, 0, sizeof(*port));
port->handle = handle;
port->minor = port_nr++;
port->drv = drv;
gpiolib_list_add(port);
return 0;
}
void gpiolib_show(int port, void *handle)
{
struct gpiolib_port *p;
if ( port == -1 ) {
p = gpiolib_ports;
while (p != NULL) {
if ( p->drv->ops->show )
p->drv->ops->show(p->handle);
p = p->next;
}
} else {
if ( handle ) {
p = handle;
} else {
p = gpiolib_find(port);
}
if ( p == NULL ) {
printf("PORT %d NOT FOUND\n", port);
return;
}
if ( p->drv->ops->show )
p->drv->ops->show(p->handle);
}
}
static void *gpiolib_open_internal(int port, char *devName)
{
struct gpiolib_port *p;
if ( gpiolib_initied == 0 )
return NULL;
/* Find */
if ( port >= 0 ) {
p = gpiolib_find(port);
} else {
p = gpiolib_find_by_name(devName);
}
if ( p == NULL )
return NULL;
if ( p->open )
return NULL;
p->open = 1;
return p;
}
void *gpiolib_open(int port)
{
return gpiolib_open_internal(port, NULL);
}
void *gpiolib_open_by_name(char *devName)
{
return gpiolib_open_internal(-1, devName);
}
void gpiolib_close(void *handle)
{
struct gpiolib_port *p = handle;
if ( p && p->open ) {
p->open = 0;
}
}
int gpiolib_set_config(void *handle, struct gpiolib_config *cfg)
{
struct gpiolib_port *port = handle;
if ( !port || !cfg )
return -1;
if ( !port->drv->ops->config )
return -1;
return port->drv->ops->config(port->handle, cfg);
}
int gpiolib_set(void *handle, int dir, int outval)
{
struct gpiolib_port *port = handle;
if ( !port )
return -1;
if ( !port->drv->ops->set )
return -1;
return port->drv->ops->set(port->handle, dir, outval);
}
int gpiolib_get(void *handle, int *inval)
{
struct gpiolib_port *port = handle;
if ( !port || !inval)
return -1;
if ( !port->drv->ops->get )
return -1;
return port->drv->ops->get(port->handle, inval);
}
/*** IRQ Functions ***/
int gpiolib_irq_register(void *handle, void *func, void *arg)
{
struct gpiolib_port *port = handle;
if ( !port )
return -1;
if ( !port->drv->ops->irq_register )
return -1;
return port->drv->ops->irq_register(port->handle, func, arg);
}
static int gpiolib_irq_opts(void *handle, unsigned int options)
{
struct gpiolib_port *port = handle;
if ( !port )
return -1;
if ( !port->drv->ops->irq_opts )
return -1;
return port->drv->ops->irq_opts(port->handle, options);
}
int gpiolib_irq_clear(void *handle)
{
return gpiolib_irq_opts(handle, GPIOLIB_IRQ_CLEAR);
}
int gpiolib_irq_force(void *handle)
{
return gpiolib_irq_opts(handle, GPIOLIB_IRQ_FORCE);
}
int gpiolib_irq_enable(void *handle)
{
return gpiolib_irq_opts(handle, GPIOLIB_IRQ_ENABLE);
}
int gpiolib_irq_disable(void *handle)
{
return gpiolib_irq_opts(handle, GPIOLIB_IRQ_DISABLE);
}
int gpiolib_irq_mask(void *handle)
{
return gpiolib_irq_opts(handle, GPIOLIB_IRQ_MASK);
}
int gpiolib_irq_unmask(void *handle)
{
return gpiolib_irq_opts(handle, GPIOLIB_IRQ_UNMASK);
}
/*** Initialization ***/
int gpiolib_initialize(void)
{
if ( gpiolib_initied != 0 )
return 0;
/* Initialize Libarary */
port_nr = 0;
gpiolib_ports = 0;
gpiolib_initied = 1;
return 0;
}
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