drivers/input/keyboard/xtkbd.c

Source file repositories/reference/linux-study-clean/drivers/input/keyboard/xtkbd.c

File Facts

System
Linux kernel
Corpus path
drivers/input/keyboard/xtkbd.c
Extension
.c
Size
3676 bytes
Lines
153
Domain
Driver Families
Bucket
drivers/input
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct xtkbd {
	unsigned char keycode[256];
	struct input_dev *dev;
	struct serio *serio;
	char phys[32];
};

static irqreturn_t xtkbd_interrupt(struct serio *serio,
	unsigned char data, unsigned int flags)
{
	struct xtkbd *xtkbd = serio_get_drvdata(serio);

	switch (data) {
		case XTKBD_EMUL0:
		case XTKBD_EMUL1:
			break;
		default:

			if (xtkbd->keycode[data & XTKBD_KEY]) {
				input_report_key(xtkbd->dev, xtkbd->keycode[data & XTKBD_KEY], !(data & XTKBD_RELEASE));
				input_sync(xtkbd->dev);
			} else {
				printk(KERN_WARNING "xtkbd.c: Unknown key (scancode %#x) %s.\n",
					data & XTKBD_KEY, data & XTKBD_RELEASE ? "released" : "pressed");
			}
	}
	return IRQ_HANDLED;
}

static int xtkbd_connect(struct serio *serio, struct serio_driver *drv)
{
	struct xtkbd *xtkbd;
	struct input_dev *input_dev;
	int err = -ENOMEM;
	int i;

	xtkbd = kmalloc_obj(*xtkbd);
	input_dev = input_allocate_device();
	if (!xtkbd || !input_dev)
		goto fail1;

	xtkbd->serio = serio;
	xtkbd->dev = input_dev;
	snprintf(xtkbd->phys, sizeof(xtkbd->phys), "%s/input0", serio->phys);
	memcpy(xtkbd->keycode, xtkbd_keycode, sizeof(xtkbd->keycode));

	input_dev->name = "XT Keyboard";
	input_dev->phys = xtkbd->phys;
	input_dev->id.bustype = BUS_XTKBD;
	input_dev->id.vendor  = 0x0001;
	input_dev->id.product = 0x0001;
	input_dev->id.version = 0x0100;
	input_dev->dev.parent = &serio->dev;

	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
	input_dev->keycode = xtkbd->keycode;
	input_dev->keycodesize = sizeof(unsigned char);
	input_dev->keycodemax = ARRAY_SIZE(xtkbd_keycode);

	for (i = 0; i < 255; i++)
		set_bit(xtkbd->keycode[i], input_dev->keybit);
	clear_bit(0, input_dev->keybit);

	serio_set_drvdata(serio, xtkbd);

	err = serio_open(serio, drv);
	if (err)
		goto fail2;

	err = input_register_device(xtkbd->dev);
	if (err)
		goto fail3;

	return 0;

 fail3:	serio_close(serio);
 fail2:	serio_set_drvdata(serio, NULL);
 fail1:	input_free_device(input_dev);
	kfree(xtkbd);
	return err;
}

static void xtkbd_disconnect(struct serio *serio)
{
	struct xtkbd *xtkbd = serio_get_drvdata(serio);

	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	input_unregister_device(xtkbd->dev);
	kfree(xtkbd);

Annotation

Implementation Notes