drivers/input/misc/stpmic1_onkey.c

Source file repositories/reference/linux-study-clean/drivers/input/misc/stpmic1_onkey.c

File Facts

System
Linux kernel
Corpus path
drivers/input/misc/stpmic1_onkey.c
Extension
.c
Size
4986 bytes
Lines
193
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 stpmic1_onkey {
	struct input_dev *input_dev;
	int irq_falling;
	int irq_rising;
};

static irqreturn_t onkey_falling_irq(int irq, void *ponkey)
{
	struct stpmic1_onkey *onkey = ponkey;
	struct input_dev *input_dev = onkey->input_dev;

	input_report_key(input_dev, KEY_POWER, 1);
	pm_wakeup_event(input_dev->dev.parent, 0);
	input_sync(input_dev);

	return IRQ_HANDLED;
}

static irqreturn_t onkey_rising_irq(int irq, void *ponkey)
{
	struct stpmic1_onkey *onkey = ponkey;
	struct input_dev *input_dev = onkey->input_dev;

	input_report_key(input_dev, KEY_POWER, 0);
	pm_wakeup_event(input_dev->dev.parent, 0);
	input_sync(input_dev);

	return IRQ_HANDLED;
}

static int stpmic1_onkey_probe(struct platform_device *pdev)
{
	struct stpmic1 *pmic = dev_get_drvdata(pdev->dev.parent);
	struct device *dev = &pdev->dev;
	struct input_dev *input_dev;
	struct stpmic1_onkey *onkey;
	unsigned int val, reg = 0;
	int error;

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

	onkey->irq_falling = platform_get_irq_byname(pdev, "onkey-falling");
	if (onkey->irq_falling < 0)
		return onkey->irq_falling;

	onkey->irq_rising = platform_get_irq_byname(pdev, "onkey-rising");
	if (onkey->irq_rising < 0)
		return onkey->irq_rising;

	if (!device_property_read_u32(dev, "power-off-time-sec", &val)) {
		if (val > 0 && val <= 16) {
			dev_dbg(dev, "power-off-time=%d seconds\n", val);
			reg |= PONKEY_PWR_OFF;
			reg |= ((16 - val) & PONKEY_TURNOFF_TIMER_MASK);
		} else {
			dev_err(dev, "power-off-time-sec out of range\n");
			return -EINVAL;
		}
	}

	if (device_property_present(dev, "st,onkey-clear-cc-flag"))
		reg |= PONKEY_CC_FLAG_CLEAR;

	error = regmap_update_bits(pmic->regmap, PKEY_TURNOFF_CR,
				   PONKEY_TURNOFF_MASK, reg);
	if (error) {
		dev_err(dev, "PKEY_TURNOFF_CR write failed: %d\n", error);
		return error;
	}

	if (device_property_present(dev, "st,onkey-pu-inactive")) {
		error = regmap_update_bits(pmic->regmap, PADS_PULL_CR,
					   PONKEY_PU_INACTIVE,
					   PONKEY_PU_INACTIVE);
		if (error) {
			dev_err(dev, "ONKEY Pads configuration failed: %d\n",
				error);
			return error;
		}
	}

	input_dev = devm_input_allocate_device(dev);
	if (!input_dev) {
		dev_err(dev, "Can't allocate Pwr Onkey Input Device\n");
		return -ENOMEM;
	}

	input_dev->name = "pmic_onkey";

Annotation

Implementation Notes