// called from kernel to initialize translate module. taken from scull
static int translate_init(void) {
int result = EXIT_SUCCESS, i;
dev_t dev;
DEBUG(printk(KERN_NOTICE "translate_init()\n"));
DEBUG(printk(KERN_NOTICE "translate_init: param subst = %s \n",translate_subst));
DEBUG(printk(KERN_NOTICE "translate_init: param bufsize = %d \n",translate_bufsize));
result = alloc_chrdev_region(&dev, MINOR_BEGINNING, NO_OF_DEVICES,"translate\n");
translate_major = MAJOR(dev);
if (result != EXIT_SUCCESS) {
DEBUG(printk(KERN_ALERT "translate_init: error(%d) getting major %d \n",
result, translate_major));
return result;
}
// allocate memory for the devices
translate_devs = kmalloc(NO_OF_DEVICES * sizeof(struct translate_dev),GFP_KERNEL);
if (!translate_devs) {
result = -ENOMEM;
goto fail;
}
// reset contents of device
memset(translate_devs, 0, NO_OF_DEVICES * sizeof(struct translate_dev));
// initialize each device (in translate its only two)
for (i = 0; i < NO_OF_DEVICES; i++) {
struct translate_dev *dev = &translate_devs[i];
// allocate buffer (just like with the device memory)
dev->buffer = kmalloc(translate_bufsize, GFP_KERNEL);
if (!(dev->buffer)) {
result = -ENOMEM;
goto fail;
}
dev->items = 0;
dev->read_pos = dev->buffer;
dev->write_pos = dev->buffer;
// init semaphores
sema_init(&dev->reader_open_lock, NUM_SIMULT_ACCESS_USERS);
sema_init(&dev->writer_open_lock, NUM_SIMULT_ACCESS_USERS);
translate_setup_cdev(&translate_devs[i], i);
DEBUG(printk(KERN_NOTICE "translate_init: translate dev %d initialized", i));
}
DEBUG(printk(KERN_NOTICE "translate_init: translate initialized"));
return EXIT_SUCCESS;
fail: translate_cleanup();
return result;
}
//regestriert jede vom Modul bereitgestellte Fähigkeiten
static int translate_init(void) {
int result;
dev_t dev;
int i;
#ifdef DEBUG_MESSAGES
printk(KERN_NOTICE "--- translate_init called ---\n");
#endif
#ifdef DEBUG_MESSAGES
printk(KERN_NOTICE "translate_init: subst = %s \n",translate_subst);
#endif
#ifdef DEBUG_MESSAGES
printk(KERN_NOTICE "translate_init: bufsize = %d \n",translate_bufsize);
#endif
//Majonummer holen
result = alloc_chrdev_region(&dev, TRANSLATE_FIRST_MINOR, TRANSLATE_NUMBER_OF_DEVS,"translate\n");
translate_major = MAJOR(dev);
if (result < 0) {
#ifdef DEBUG_MESSAGES
printk(KERN_ALERT "translate: can`t get major %d \n",translate_major);
#endif
return result;
}
/*allocate memory for both structs an get the pointer*/
translate_devs = kmalloc(TRANSLATE_NUMBER_OF_DEVS * sizeof(struct translate_dev),GFP_KERNEL);
if (!translate_devs) {
result = -ENOMEM;
goto fail;
}
/*overwrite the device memory with 0*/
memset(translate_devs, 0, TRANSLATE_NUMBER_OF_DEVS * sizeof(struct translate_dev));
/*init the member of both devices (translate0,translate1)*/
for (i = 0; i < TRANSLATE_NUMBER_OF_DEVS; i++) {
/*init the semaphores*/
sema_init(&translate_devs[i].reader_open_lock, 1);
sema_init(&translate_devs[i].writer_open_lock, 1);
sema_init(&translate_devs[i].itemsInBuffer, 0);
sema_init(&translate_devs[i].freeBufferSpace, translate_bufsize);
/*allocate memory for the buffer an set the pointer*/
translate_devs[i].buffer = kmalloc(translate_bufsize, GFP_KERNEL);
if (!translate_devs[i].buffer) {
result = -ENOMEM;
goto fail;
}
/*init the other member of the struct*/
translate_devs[i].items = 0;
translate_devs[i].read_pos = translate_devs[i].buffer;
translate_devs[i].write_pos = translate_devs[i].buffer;
translate_setup_cdev(&translate_devs[i], i);
}
return 0;
fail: translate_cleanup();
return result;
}
// Kernel initialisierung des Translate Modules. Aus Scull kopiert
static int translate_init(void) {
int result = EXIT_SUCCESS, i;
dev_t dev;
#ifdef DEBUG_MESSAGES
printk(KERN_NOTICE "translate_init()\n");
printk(KERN_NOTICE "translate_init: param subst = %s \n",translate_subst);
printk(KERN_NOTICE "translate_init: param bufsize = %d \n",translate_bufsize);
#endif
result = alloc_chrdev_region(&dev, MINOR_START_IDX, NO_OF_DEVICES,"translate\n");
translate_major = MAJOR(dev);
if (result != EXIT_SUCCESS) {
#ifdef DEBUG_MESSAGES
printk(KERN_ALERT "translate_init: error(%d) getting major %d \n",
result, translate_major);
#endif
return result;
}
// Speicher fuer die Devices allozieren
translate_devs = kmalloc(NO_OF_DEVICES * sizeof(struct translate_dev),GFP_KERNEL);
if (!translate_devs) {
result = -ENOMEM;
goto fail;
}
// Inhalt der Device zuruecksetzen
memset(translate_devs, 0, NO_OF_DEVICES * sizeof(struct translate_dev));
// Initialisieren der Devices
for (i = 0; i < NO_OF_DEVICES; i++) {
struct translate_dev *dev = &translate_devs[i];
// Allocate Buffer
dev->buffer = kmalloc(translate_bufsize, GFP_KERNEL);
if (!(dev->buffer)) {
result = -ENOMEM;
goto fail;
}
dev->items = 0;
dev->read_pos = dev->buffer;
dev->write_pos = dev->buffer;
// Initialisieren der Semaphore
sema_init(&dev->reader_open_lock, 1);
sema_init(&dev->writer_open_lock, 1);
translate_setup_cdev(&translate_devs[i], i);
#ifdef DEBUG_MESSAGES
printk(KERN_NOTICE "translate_init: translate dev %d initialized", i);
#endif
}
#ifdef DEBUG_MESSAGES
printk(KERN_NOTICE "translate_init: translate initialized");
#endif
return EXIT_SUCCESS;
fail: translate_cleanup();
return result;
}
