drivers/input/keyboard/imx-sm-bbm-key.c

Source file repositories/reference/linux-study-clean/drivers/input/keyboard/imx-sm-bbm-key.c

File Facts

System
Linux kernel
Corpus path
drivers/input/keyboard/imx-sm-bbm-key.c
Extension
.c
Size
5526 bytes
Lines
226
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 scmi_imx_bbm {
	struct scmi_protocol_handle *ph;
	const struct scmi_imx_bbm_proto_ops *ops;
	struct notifier_block nb;
	int keycode;
	int keystate;  /* 1:pressed */
	bool suspended;
	struct delayed_work check_work;
	struct input_dev *input;
};

static void scmi_imx_bbm_pwrkey_check_for_events(struct work_struct *work)
{
	struct scmi_imx_bbm *bbnsm = container_of(to_delayed_work(work),
						  struct scmi_imx_bbm, check_work);
	struct scmi_protocol_handle *ph = bbnsm->ph;
	struct input_dev *input = bbnsm->input;
	u32 state = 0;
	int ret;

	ret = bbnsm->ops->button_get(ph, &state);
	if (ret) {
		pr_err("%s: %d\n", __func__, ret);
		return;
	}

	pr_debug("%s: state: %d, keystate %d\n", __func__, state, bbnsm->keystate);

	/* only report new event if status changed */
	if (state ^ bbnsm->keystate) {
		bbnsm->keystate = state;
		input_event(input, EV_KEY, bbnsm->keycode, state);
		input_sync(input);
		pm_relax(bbnsm->input->dev.parent);
		pr_debug("EV_KEY: %x\n", bbnsm->keycode);
	}

	/* repeat check if pressed long */
	if (state)
		schedule_delayed_work(&bbnsm->check_work, msecs_to_jiffies(REPEAT_INTERVAL));
}

static int scmi_imx_bbm_pwrkey_event(struct scmi_imx_bbm *bbnsm)
{
	struct input_dev *input = bbnsm->input;

	pm_wakeup_event(input->dev.parent, 0);

	/*
	 * Directly report key event after resume to make no key press
	 * event is missed.
	 */
	if (READ_ONCE(bbnsm->suspended)) {
		bbnsm->keystate = 1;
		input_event(input, EV_KEY, bbnsm->keycode, 1);
		input_sync(input);
		WRITE_ONCE(bbnsm->suspended, false);
	}

	schedule_delayed_work(&bbnsm->check_work, msecs_to_jiffies(DEBOUNCE_TIME));

	return 0;
}

static void scmi_imx_bbm_pwrkey_act(void *pdata)
{
	struct scmi_imx_bbm *bbnsm = pdata;

	cancel_delayed_work_sync(&bbnsm->check_work);
}

static int scmi_imx_bbm_key_notifier(struct notifier_block *nb, unsigned long event, void *data)
{
	struct scmi_imx_bbm *bbnsm = container_of(nb, struct scmi_imx_bbm, nb);
	struct scmi_imx_bbm_notif_report *r = data;

	if (r->is_button) {
		pr_debug("BBM Button Power key pressed\n");
		scmi_imx_bbm_pwrkey_event(bbnsm);
	} else {
		/* Should never reach here */
		pr_err("Unexpected BBM event: %s\n", __func__);
	}

	return 0;
}

static int scmi_imx_bbm_pwrkey_init(struct scmi_device *sdev)
{
	const struct scmi_handle *handle = sdev->handle;

Annotation

Implementation Notes