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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
#include "gfx.h"
#if GFX_USE_GDRIVER
#include "sys_defs.h"
#include <string.h> // For memset
// Define the tables to hold the driver instances.
static GDriver *dhead;
static GDriver *dtail;
// The system initialization.
void _gdriverInit(void) {
}
// The system de-initialization.
void _gdriverDeinit(void) {
while(dhead)
gdriverUnRegister(dhead);
}
GDriver *gdriverRegister(const GDriverVMT *vmt, void *param) {
GDriver * pd;
unsigned dinstance, sinstance;
// Loop to find the driver instance and the system instance numbers
dinstance = sinstance = 0;
for(pd = dhead; pd; pd = pd->driverchain) {
if (pd->vmt == vmt)
dinstance++;
if (pd->vmt->type == vmt->type)
sinstance++;
}
// Get a new driver instance of the correct size and initialize it
pd = gfxAlloc(vmt->objsize);
if (!pd)
return 0;
memset(pd, 0, vmt->objsize);
pd->vmt = vmt;
if (vmt->init && !vmt->init(pd, param, dinstance, sinstance)) {
gfxFree(pd);
return 0;
}
// Add it to the driver chain
if (dhead)
dtail->driverchain = pd;
else
dhead = dtail = pd;
// Do the post init
if (vmt->postinit)
vmt->postinit(pd);
return pd;
}
void gdriverUnRegister(GDriver *driver) {
GDriver *pd;
// Safety
if (!driver)
return;
// Remove it from the list of drivers
if (dhead == driver)
dhead = driver->driverchain;
else {
for(pd = dhead; pd->driverchain; pd = pd->driverchain) {
if (pd->driverchain == driver) {
pd->driverchain = driver->driverchain;
break;
}
}
}
// Call the deinit()
if (driver->vmt->deinit)
driver->vmt->deinit(driver);
// Cleanup
gfxFree(driver);
}
GDriver *gdriverGetInstance(uint16_t type, unsigned instance) {
GDriver *pd;
unsigned sinstance;
// Loop to find the system instance
sinstance = 0;
for(pd = dhead; pd; pd = pd->driverchain) {
if (pd->vmt->type == type) {
if (sinstance == instance)
return pd;
sinstance++;
}
}
return 0;
}
unsigned gdriverInstanceCount(uint16_t type) {
GDriver *pd;
unsigned sinstance;
// Loop to count the system instances
sinstance = 0;
for(pd = dhead; pd; pd = pd->driverchain) {
if (pd->vmt->type == type)
sinstance++;
}
return sinstance;
}
GDriver *gdriverGetNext(uint16_t type, GDriver *driver) {
driver = driver ? driver->driverchain : dhead;
while(driver && driver->vmt->type != type)
driver = driver->driverchain;
return driver;
}
unsigned gdriverGetDriverInstanceNumber(GDriver *driver) {
GDriver *pd;
unsigned instance;
// Loop to find the system instance
instance = 0;
for(pd = dhead; pd; pd = pd->driverchain) {
if (pd == driver)
return instance;
if (pd->vmt->type == driver->vmt->type)
instance++;
}
return (unsigned)-1;
}
#endif /* GFX_USE_GDRIVER */
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