drivers/staging/nvec/nvec_kbd.c

Source file repositories/reference/linux-study-clean/drivers/staging/nvec/nvec_kbd.c

File Facts

System
Linux kernel
Corpus path
drivers/staging/nvec/nvec_kbd.c
Extension
.c
Size
4545 bytes
Lines
190
Domain
Driver Families
Bucket
drivers/staging
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 nvec_keys {
	struct input_dev *input;
	struct notifier_block notifier;
	struct nvec_chip *nvec;
	bool caps_lock;
};

static struct nvec_keys keys_dev;

static void nvec_kbd_toggle_led(void)
{
	char buf[] = { NVEC_KBD, SET_LEDS, 0 };

	keys_dev.caps_lock = !keys_dev.caps_lock;

	if (keys_dev.caps_lock)
		/* should be BIT(0) only, firmware bug? */
		buf[2] = BIT(0) | BIT(1) | BIT(2);

	nvec_write_async(keys_dev.nvec, buf, sizeof(buf));
}

static int nvec_keys_notifier(struct notifier_block *nb,
			      unsigned long event_type, void *data)
{
	int code, state;
	unsigned char *msg = data;

	if (event_type == NVEC_KB_EVT) {
		int _size = (msg[0] & (3 << 5)) >> 5;

/* power on/off button */
		if (_size == NVEC_VAR_SIZE)
			return NOTIFY_STOP;

		if (_size == NVEC_3BYTES)
			msg++;

		code = msg[1] & 0x7f;
		state = msg[1] & 0x80;

		if (code_tabs[_size][code] == KEY_CAPSLOCK && state)
			nvec_kbd_toggle_led();

		input_report_key(keys_dev.input, code_tabs[_size][code],
				 !state);
		input_sync(keys_dev.input);

		return NOTIFY_STOP;
	}

	return NOTIFY_DONE;
}

static int nvec_kbd_event(struct input_dev *dev, unsigned int type,
			  unsigned int code, int value)
{
	struct nvec_chip *nvec = keys_dev.nvec;
	char buf[] = { NVEC_KBD, SET_LEDS, 0 };

	if (type == EV_REP)
		return 0;

	if (type != EV_LED)
		return -1;

	if (code != LED_CAPSL)
		return -1;

	buf[2] = !!value;
	nvec_write_async(nvec, buf, sizeof(buf));

	return 0;
}

static int nvec_kbd_probe(struct platform_device *pdev)
{
	struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
	int i, j, err;
	struct input_dev *idev;
	char	clear_leds[] = { NVEC_KBD, SET_LEDS, 0 },
		enable_kbd[] = { NVEC_KBD, ENABLE_KBD },
		cnfg_wake[] = { NVEC_KBD, CNFG_WAKE, true, true },
		cnfg_wake_key_reporting[] = { NVEC_KBD, CNFG_WAKE_KEY_REPORTING,
						true };

	j = 0;

	for (i = 0; i < ARRAY_SIZE(code_tab_102us); ++i)
		keycodes[j++] = code_tab_102us[i];

Annotation

Implementation Notes