static int __init install(void)
{
int i, result;
dev_t dev=0;
printk(KERN_ALERT "Initialisation driver touchscreen\n");
if (result<0) {
printk(KERN_ALERT "install driver : can't get major number\n");
return result;
}
touchscreen = kmalloc(MAXDEVICES*sizeof(struct devInfo), GFP_KERNEL);
if (!touchscreen) {
result = -ENOMEM;
goto fail;
}
memset(touchscreen, 0, MAXDEVICES*sizeof(struct devInfo));
for (i=0; i < MAXDEVICES; i++) {
setup_dev(&touchscreen[i], i);
}
printk(KERN_ALERT "installation OK, MAJOR NUMBER: %i\n",major);
return 0;
fail:
desinstall();
return result;
}
void device_setup(void)
{
extern void console_map_init(void);
struct gendisk *p;
int nr=0;
chr_dev_init();
blk_dev_init();
sti();
#ifdef CONFIG_SCSI
scsi_dev_init();
#endif
#ifdef CONFIG_INET
net_dev_init();
#endif
console_map_init();
for (p = gendisk_head ; p ; p=p->next) {
setup_dev(p);
nr += p->nr_real;
}
#ifdef CONFIG_BLK_DEV_RAM
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start && mount_initrd) initrd_load();
else
#endif
rd_load();
#endif
}
int main(int argc, char **argv)
{
int rem = 0, c;
char *pkt_device;
char *device;
if (argc == 1)
return usage();
while ((c = getopt(argc, argv, "ds?")) != EOF) {
switch (c) {
case 'd':
rem = 1;
break;
case 's':
show_mappings();
return 0;
default:
return usage();
}
}
pkt_device = argv[optind];
device = argv[optind + 1];
if (strchr(pkt_device, '/'))
setup_dev(pkt_device, device, rem);
else
setup_dev_chardev(pkt_device, device, rem);
return 0;
}
static void
do_mkdev (vfsmsg_t *msg) {
int i;
i = find_empty_devtab();
if (i < 0) {
msg->mkdev.ans.id = -1;
return;
}
devtab[i] = setup_dev(msg);
msg->mkdev.ans.id = i;
return;
}
static int __init list3_init(void)
{
printk(KERN_INFO "list3: Initializing the list3 LKM\n",
communication_mode);
if (strcmp(communication_mode, "sysfs") == 0)
printk(KERN_INFO "list3: sysfs communication_mode. Ioctl will be unavailable\n");
else
if (strcmp(communication_mode, "ioctl") == 0)
printk(KERN_INFO "list3: ioctl communication_mode. Sysfs will be unavailable\n");
else
printk(KERN_INFO "list3: Wrong communication mode\n");
// Try to dynamically allocate a major number for the device
major_number = register_chrdev(0, DEVICE_NAME, &fops);
if (major_number < 0)
{
printk(KERN_ALERT "list3 failed to register a major number\n");
return major_number;
}
printk(KERN_INFO "list3: registered correctly with major number %d\n", major_number);
// Register the device class
list3_class = class_create(THIS_MODULE, CLASS_NAME);
if (IS_ERR(list3_class))
{
unregister_chrdev(major_number, DEVICE_NAME);
printk(KERN_ALERT "Failed to register device class\n");
return PTR_ERR(list3_class); // Correct way to return an error on a pointer
}
printk(KERN_INFO "list3: device class registered correctly\n");
// Register the device driver
list3_device = device_create(list3_class, NULL, MKDEV(major_number, 0), NULL, DEVICE_NAME);
if (IS_ERR(list3_device))
{ // Clean up if there is an error
class_destroy(list3_class); // Repeated code but the alternative is goto statements
unregister_chrdev(major_number, DEVICE_NAME);
printk(KERN_ALERT "Failed to create the device\n");
return PTR_ERR(list3_device);
}
setup_dev();
if (strcmp(communication_mode, "sysfs") == 0)
setup_sysfs();
mutex_init(&list3_mutex);
printk(KERN_INFO "list3: device class created correctly\n");
return 0;
}
void device_setup(void)
{
register struct gendisk *p;
chr_dev_init();
blk_dev_init();
set_irq();
for (p = gendisk_head; p; p = p->next)
setup_dev(p);
#ifdef CONFIG_BLK_DEV_RAM
rd_load();
#endif
}