drivers/platform/x86/xo15-ebook.c

Source file repositories/reference/linux-study-clean/drivers/platform/x86/xo15-ebook.c

File Facts

System
Linux kernel
Corpus path
drivers/platform/x86/xo15-ebook.c
Extension
.c
Size
3802 bytes
Lines
163
Domain
Driver Families
Bucket
drivers/platform
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 ebook_switch {
	struct input_dev *input;
	char phys[32];			/* for input device */
};

static int ebook_send_state(struct acpi_device *device)
{
	struct ebook_switch *button = acpi_driver_data(device);
	unsigned long long state;
	acpi_status status;

	status = acpi_evaluate_integer(device->handle, "EBK", NULL, &state);
	if (ACPI_FAILURE(status))
		return -EIO;

	/* input layer checks if event is redundant */
	input_report_switch(button->input, SW_TABLET_MODE, !state);
	input_sync(button->input);
	return 0;
}

static void ebook_switch_notify(struct acpi_device *device, u32 event)
{
	switch (event) {
	case ACPI_FIXED_HARDWARE_EVENT:
	case XO15_EBOOK_NOTIFY_STATUS:
		ebook_send_state(device);
		break;
	default:
		acpi_handle_debug(device->handle,
				  "Unsupported event [0x%x]\n", event);
		break;
	}
}

#ifdef CONFIG_PM_SLEEP
static int ebook_switch_resume(struct device *dev)
{
	return ebook_send_state(to_acpi_device(dev));
}
#endif

static SIMPLE_DEV_PM_OPS(ebook_switch_pm, NULL, ebook_switch_resume);

static int ebook_switch_add(struct acpi_device *device)
{
	const struct acpi_device_id *id;
	struct ebook_switch *button;
	struct input_dev *input;
	int error;

	button = kzalloc_obj(struct ebook_switch);
	if (!button)
		return -ENOMEM;

	device->driver_data = button;

	button->input = input = input_allocate_device();
	if (!input) {
		error = -ENOMEM;
		goto err_free_button;
	}

	id = acpi_match_acpi_device(ebook_device_ids, device);
	if (!id) {
		dev_err(&device->dev, "Unsupported hid\n");
		error = -ENODEV;
		goto err_free_input;
	}

	strscpy(acpi_device_name(device), XO15_EBOOK_DEVICE_NAME);
	strscpy(acpi_device_class(device), XO15_EBOOK_CLASS "/" XO15_EBOOK_SUBCLASS);

	snprintf(button->phys, sizeof(button->phys), "%s/button/input0", id->id);

	input->name = acpi_device_name(device);
	input->phys = button->phys;
	input->id.bustype = BUS_HOST;
	input->dev.parent = &device->dev;

	input->evbit[0] = BIT_MASK(EV_SW);
	set_bit(SW_TABLET_MODE, input->swbit);

	error = input_register_device(input);
	if (error)
		goto err_free_input;

	ebook_send_state(device);

	if (device->wakeup.flags.valid) {

Annotation

Implementation Notes