drivers/input/keyboard/stowaway.c

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

File Facts

System
Linux kernel
Corpus path
drivers/input/keyboard/stowaway.c
Extension
.c
Size
3924 bytes
Lines
154
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 skbd {
	unsigned char keycode[128];
	struct input_dev *dev;
	struct serio *serio;
	char phys[32];
};

static irqreturn_t skbd_interrupt(struct serio *serio, unsigned char data,
				  unsigned int flags)
{
	struct skbd *skbd = serio_get_drvdata(serio);
	struct input_dev *dev = skbd->dev;

	if (skbd->keycode[data & SKBD_KEY_MASK]) {
		input_report_key(dev, skbd->keycode[data & SKBD_KEY_MASK],
				 !(data & SKBD_RELEASE));
		input_sync(dev);
	}

	return IRQ_HANDLED;
}

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

	skbd = kzalloc_obj(*skbd);
	input_dev = input_allocate_device();
	if (!skbd || !input_dev)
		goto fail1;

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

	input_dev->name = "Stowaway Keyboard";
	input_dev->phys = skbd->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor = SERIO_STOWAWAY;
	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 = skbd->keycode;
	input_dev->keycodesize = sizeof(unsigned char);
	input_dev->keycodemax = ARRAY_SIZE(skbd_keycode);
	for (i = 0; i < ARRAY_SIZE(skbd_keycode); i++)
		set_bit(skbd_keycode[i], input_dev->keybit);
	clear_bit(0, input_dev->keybit);

	serio_set_drvdata(serio, skbd);

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

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

	return 0;

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

static void skbd_disconnect(struct serio *serio)
{
	struct skbd *skbd = serio_get_drvdata(serio);

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

static const struct serio_device_id skbd_serio_ids[] = {
	{
		.type	= SERIO_RS232,
		.proto	= SERIO_STOWAWAY,
		.id	= SERIO_ANY,
		.extra	= SERIO_ANY,

Annotation

Implementation Notes