How to use the matrix_keypad.h file for a custom keypad driver?

问题

can i emulate a custom keypad with input_dev (from input.h)

//an example with just one key.
button_dev = input_allocate_device();
    if (!button_dev) {
        printk(KERN_ERR "button.c: Not enough memory\n");
        error = -ENOMEM;
        goto err_free_irq;
    }

    button_dev->evbit[0] = BIT_MASK(EV_KEY);
    button_dev->keybit[BIT_WORD(BTN_0)] = BIT_MASK(BTN_0);

or i will have to use matrix_keypad header file?If yes then How?

来源：https://stackoverflow.com/questions/45382982/how-to-use-the-matrix-keypad-h-file-for-a-custom-keypad-driver