drivers/input/misc/ab8500-ponkey.c

Source file repositories/reference/linux-study-clean/drivers/input/misc/ab8500-ponkey.c

File Facts

System
Linux kernel
Corpus path
drivers/input/misc/ab8500-ponkey.c
Extension
.c
Size
3254 bytes
Lines
131
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 ab8500_ponkey {
	struct input_dev	*idev;
	struct ab8500		*ab8500;
	int			irq_dbf;
	int			irq_dbr;
};

/* AB8500 gives us an interrupt when ONKEY is held */
static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
{
	struct ab8500_ponkey *ponkey = data;

	if (irq == ponkey->irq_dbf)
		input_report_key(ponkey->idev, KEY_POWER, true);
	else if (irq == ponkey->irq_dbr)
		input_report_key(ponkey->idev, KEY_POWER, false);

	input_sync(ponkey->idev);

	return IRQ_HANDLED;
}

static int ab8500_ponkey_probe(struct platform_device *pdev)
{
	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
	struct ab8500_ponkey *ponkey;
	struct input_dev *input;
	int irq_dbf, irq_dbr;
	int error;

	irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
	if (irq_dbf < 0)
		return irq_dbf;

	irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
	if (irq_dbr < 0)
		return irq_dbr;

	ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey),
			      GFP_KERNEL);
	if (!ponkey)
		return -ENOMEM;

	input = devm_input_allocate_device(&pdev->dev);
	if (!input)
		return -ENOMEM;

	ponkey->idev = input;
	ponkey->ab8500 = ab8500;
	ponkey->irq_dbf = irq_dbf;
	ponkey->irq_dbr = irq_dbr;

	input->name = "AB8500 POn(PowerOn) Key";
	input->dev.parent = &pdev->dev;

	input_set_capability(input, EV_KEY, KEY_POWER);

	error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf,
					     ab8500_ponkey_handler, 0,
					     "ab8500-ponkey-dbf", ponkey);
	if (error < 0) {
		dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
			ponkey->irq_dbf, error);
		return error;
	}

	error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr,
					     ab8500_ponkey_handler, 0,
					     "ab8500-ponkey-dbr", ponkey);
	if (error < 0) {
		dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
			ponkey->irq_dbr, error);
		return error;
	}

	error = input_register_device(ponkey->idev);
	if (error) {
		dev_err(ab8500->dev, "Can't register input device: %d\n", error);
		return error;
	}

	return 0;
}

#ifdef CONFIG_OF
static const struct of_device_id ab8500_ponkey_match[] = {
	{ .compatible = "stericsson,ab8500-ponkey", },
	{}
};
MODULE_DEVICE_TABLE(of, ab8500_ponkey_match);

Annotation

Implementation Notes