drivers/platform/x86/apple-gmux.c

Source file repositories/reference/linux-study-clean/drivers/platform/x86/apple-gmux.c

File Facts

System
Linux kernel
Corpus path
drivers/platform/x86/apple-gmux.c
Extension
.c
Size
32201 bytes
Lines
1040
Domain
Driver Families
Bucket
drivers/platform
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

static const struct file_operations gmux_port_data_ops = {
	.open = simple_open,
	.write = gmux_selected_port_data_write,
	.read = gmux_selected_port_data_read
};

static void gmux_init_debugfs(struct apple_gmux_data *gmux_data)
{
	gmux_data->debug_dentry = debugfs_create_dir(KBUILD_MODNAME, NULL);

	debugfs_create_u8("selected_port", 0644, gmux_data->debug_dentry,
			&gmux_data->selected_port);
	debugfs_create_file("selected_port_data", 0644, gmux_data->debug_dentry,
			gmux_data, &gmux_port_data_ops);
}

static void gmux_fini_debugfs(struct apple_gmux_data *gmux_data)
{
	debugfs_remove_recursive(gmux_data->debug_dentry);
}

static int gmux_suspend(struct device *dev)
{
	struct pnp_dev *pnp = to_pnp_dev(dev);
	struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);

	gmux_disable_interrupts(gmux_data);
	return 0;
}

static int gmux_resume(struct device *dev)
{
	struct pnp_dev *pnp = to_pnp_dev(dev);
	struct apple_gmux_data *gmux_data = pnp_get_drvdata(pnp);

	gmux_enable_interrupts(gmux_data);
	gmux_write_switch_state(gmux_data);
	if (gmux_data->power_state == VGA_SWITCHEROO_OFF)
		gmux_set_discrete_state(gmux_data, gmux_data->power_state);
	return 0;
}

static int is_thunderbolt(struct device *dev, void *data)
{
	return to_pci_dev(dev)->is_thunderbolt;
}

static int gmux_probe(struct pnp_dev *pnp, const struct pnp_device_id *id)
{
	struct apple_gmux_data *gmux_data;
	struct resource *res;
	struct backlight_properties props;
	struct backlight_device *bdev = NULL;
	u8 ver_major, ver_minor, ver_release;
	bool register_bdev = true;
	int ret = -ENXIO;
	acpi_status status;
	unsigned long long gpe;
	enum apple_gmux_type type;
	u32 version;

	if (apple_gmux_data)
		return -EBUSY;

	if (!apple_gmux_detect(pnp, &type)) {
		pr_info("gmux device not present\n");
		return -ENODEV;
	}

	gmux_data = kzalloc_obj(*gmux_data);
	if (!gmux_data)
		return -ENOMEM;
	pnp_set_drvdata(pnp, gmux_data);

	switch (type) {
	case APPLE_GMUX_TYPE_MMIO:
		gmux_data->config = &apple_gmux_mmio;
		mutex_init(&gmux_data->index_lock);

		res = pnp_get_resource(pnp, IORESOURCE_MEM, 0);
		gmux_data->iostart = res->start;
		/* Although the ACPI table only allocates 8 bytes, we need 16. */
		gmux_data->iolen = 16;
		if (!request_mem_region(gmux_data->iostart, gmux_data->iolen,
					"Apple gmux")) {
			pr_err("gmux I/O already in use\n");
			goto err_free;
		}
		gmux_data->iomem_base = ioremap(gmux_data->iostart, gmux_data->iolen);
		if (!gmux_data->iomem_base) {

Annotation

Implementation Notes