static int labx_local_audio_open(struct inode *inode, struct file *filp) {
int deviceIndex;
struct labx_local_audio_pdev *local_audio_pdev;
/* Search for the device amongst those which successfully were probed */
for(deviceIndex = 0; deviceIndex < MAX_LA_DEVICES; deviceIndex++) {
if ((devices[deviceIndex] != NULL) && (devices[deviceIndex]->miscdev.minor == iminor(inode))) {
/* Retain the device pointer within the file pointer for future navigation */
filp->private_data = devices[deviceIndex];
break;
}
}
/* Ensure the device was actually found */
if(deviceIndex >= MAX_LA_DEVICES) {
printk(KERN_WARNING DRIVER_NAME ": Could not find device for node (%d, %d)\n",
imajor(inode), iminor(inode));
return(-ENODEV);
}
/* TODO - Ensure the local audio hardware is reset */
local_audio_pdev = (struct labx_local_audio_pdev*)filp->private_data;
/* Also open the DMA instance, if there is one */
if(local_audio_pdev->dma != NULL) labx_dma_open(local_audio_pdev->dma);
/* Invoke the open() operation on the derived driver, if there is one */
if((local_audio_pdev->derivedFops != NULL) &&
(local_audio_pdev->derivedFops->open != NULL)) {
local_audio_pdev->derivedFops->open(inode, filp);
}
return(0);
}
static int labx_dma_open_cdev(struct inode *inode, struct file *filp) {
int i;
struct labx_dma_pdev *dma_pdev = NULL;
for (i = 0; i<MAX_DMA_DEVICES; i++) {
/* printk("lookup %d = %p, %d (looking for %d)\n", i, devices[i], (devices[i]) ? devices[i]->miscdev.minor : -1, iminor(inode));*/
if ((devices[i] != NULL) && (devices[i]->miscdev.minor == iminor(inode)))
{
/* printk("labx_dma_open: found %p\n", devices[i]);*/
dma_pdev = devices[i];
filp->private_data = dma_pdev;
break;
}
}
if(dma_pdev == NULL) return(-1);
/* Inform the encapsulated DMA driver that it is being opened */
return(labx_dma_open(&dma_pdev->dma));
}
