drivers/input/misc/tps6594-pwrbutton.c

Source file repositories/reference/linux-study-clean/drivers/input/misc/tps6594-pwrbutton.c

File Facts

System
Linux kernel
Corpus path
drivers/input/misc/tps6594-pwrbutton.c
Extension
.c
Size
2823 bytes
Lines
127
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 tps6594_pwrbutton {
	struct device *dev;
	struct input_dev *idev;
	char phys[32];
};

static irqreturn_t tps6594_pb_push_irq(int irq, void *_pwr)
{
	struct tps6594_pwrbutton *pwr = _pwr;

	input_report_key(pwr->idev, KEY_POWER, 1);
	pm_wakeup_event(pwr->dev, 0);
	input_sync(pwr->idev);

	return IRQ_HANDLED;
}

static irqreturn_t tps6594_pb_release_irq(int irq, void *_pwr)
{
	struct tps6594_pwrbutton *pwr = _pwr;

	input_report_key(pwr->idev, KEY_POWER, 0);
	input_sync(pwr->idev);

	return IRQ_HANDLED;
}

static int tps6594_pb_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct tps6594_pwrbutton *pwr;
	struct input_dev *idev;
	int error;
	int push_irq;
	int release_irq;

	pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
	if (!pwr)
		return -ENOMEM;

	idev = devm_input_allocate_device(dev);
	if (!idev)
		return -ENOMEM;

	idev->name = pdev->name;
	snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
		 pdev->name);
	idev->phys = pwr->phys;
	idev->id.bustype = BUS_I2C;

	input_set_capability(idev, EV_KEY, KEY_POWER);

	pwr->dev = dev;
	pwr->idev = idev;
	device_init_wakeup(dev, true);

	push_irq = platform_get_irq(pdev, 0);
	if (push_irq < 0)
		return -EINVAL;

	release_irq = platform_get_irq(pdev, 1);
	if (release_irq < 0)
		return -EINVAL;

	error = devm_request_threaded_irq(dev, push_irq, NULL,
					  tps6594_pb_push_irq,
					  IRQF_ONESHOT,
					  pdev->resource[0].name, pwr);
	if (error) {
		dev_err(dev, "failed to request push IRQ #%d: %d\n", push_irq,
			error);
		return error;
	}

	error = devm_request_threaded_irq(dev, release_irq, NULL,
					  tps6594_pb_release_irq,
					  IRQF_ONESHOT,
					  pdev->resource[1].name, pwr);
	if (error) {
		dev_err(dev, "failed to request release IRQ #%d: %d\n",
			release_irq, error);
		return error;
	}

	error = input_register_device(idev);
	if (error) {
		dev_err(dev, "Can't register power button: %d\n", error);
		return error;
	}

Annotation

Implementation Notes