82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
MODULE_AUTHOR("Manuel Vögele, Siegfried Kienzle, Simon Wörner");
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MODULE_DESCRIPTION(DEVICE_NAME "driver");
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MODULE_LICENSE("GPL");
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static int __init ModInit(void)
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{
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unsigned int i = 0;
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printk(KERN_DEBUG DEVICE_NAME ": init");
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if (alloc_chrdev_region(&devno, 0, NUMBER_OF_MINOR_DEVICE, DEVICE_NAME) < 0)
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return -EIO;
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cdev_init(&chardev, &fops);
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chardev.owner = THIS_MODULE;
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chardev.ops = &fops;
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if (cdev_add(&chardev, devno, NUMBER_OF_MINOR_DEVICE)) {
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pr_err(DEVICE_NAME ": cdev_add failed.");
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goto free_device_number;
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}
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chardev_class = class_create(THIS_MODULE, DEVICE_NAME);
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if (IS_ERR(chardev_class)) {
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pr_err(DEVICE_NAME ": no udev support\n");
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goto free_cdev;
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}
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for (i = 0; i < NUMBER_OF_MINOR_DEVICE; ++i)
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{
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#if NUMBER_OF_MINOR_DEVICE == 1
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chardev_device[i] = device_create(chardev_class, NULL, devno + i, NULL, DEVICE_NAME);
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#else
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chardev_device[i] = device_create(chardev_class, NULL, devno + i, NULL, DEVICE_NAME "%d", i);
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#endif
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if (IS_ERR(chardev_device[i])) {
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pr_err(DEVICE_NAME ": device create failed\n");
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goto free_device;
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}
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}
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#ifdef CUSTOM_INIT
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CUSTOM_INIT
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#endif
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return 0;
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free_device:
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for (; i > 0; --i) {
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device_destroy(chardev_class, devno + i - 1);
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}
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class_destroy(chardev_class);
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free_cdev:
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cdev_del(&chardev);
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free_device_number:
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unregister_chrdev_region(devno, NUMBER_OF_MINOR_DEVICE);
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return -EIO;
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}
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static void __exit ModExit(void)
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{
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unsigned int i = 0;
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printk(KERN_DEBUG DEVICE_NAME ": exit");
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#ifdef CUSTOM_EXIT
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CUSTOM_EXIT
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#endif
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for (i = NUMBER_OF_MINOR_DEVICE; i > 0; --i) {
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device_destroy(chardev_class, devno + i - 1);
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}
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class_destroy(chardev_class);
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cdev_del(&chardev);
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unregister_chrdev_region(devno, NUMBER_OF_MINOR_DEVICE);
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}
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module_init( ModInit );
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module_exit( ModExit ); |