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/** Initialize character device.
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/** Initialize character device.
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 *
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 *
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 * @param chardev Character device.
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 * @param chardev Character device.
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 * @param op Implementation of character device operations.
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 * @param op Implementation of character device operations.
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 */
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 */
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void chardev_initialize(chardev_t *chardev, chardev_operations_t *op)
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void chardev_initialize(char *name,chardev_t *chardev,
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            chardev_operations_t *op)
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{
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{
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    chardev->name = name;
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    waitq_initialize(&chardev->wq);
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    waitq_initialize(&chardev->wq);
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    spinlock_initialize(&chardev->lock, "chardev");
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    spinlock_initialize(&chardev->lock, "chardev");
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    chardev->counter = 0;
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    chardev->counter = 0;
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    chardev->index = 0;
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    chardev->index = 0;
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    chardev->op = op;
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    chardev->op = op;
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{
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{
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        spinlock_lock(&chardev->lock);
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        spinlock_lock(&chardev->lock);
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    chardev->counter++;
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    chardev->counter++;
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    if (chardev->counter == CHARDEV_BUFLEN - 1) {
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    if (chardev->counter == CHARDEV_BUFLEN - 1) {
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        /* buffer full => disable device interrupt */
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        /* buffer full => disable device interrupt */
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        chardev->op->suspend();
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        chardev->op->suspend(chardev);
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    }
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    }
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    putchar(ch);
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    putchar(ch);
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        chardev->buffer[chardev->index++] = ch;
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        chardev->buffer[chardev->index++] = ch;
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        chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */
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        chardev->index = chardev->index % CHARDEV_BUFLEN; /* index modulo size of buffer */