drivers/usb/gadget/legacy/mass_storage.c

Source file repositories/reference/linux-study-clean/drivers/usb/gadget/legacy/mass_storage.c

File Facts

System
Linux kernel
Corpus path
drivers/usb/gadget/legacy/mass_storage.c
Extension
.c
Size
6064 bytes
Lines
239
Domain
Driver Families
Bucket
drivers/usb
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

if (!usb_desc) {
			status = -ENOMEM;
			goto fail_string_ids;
		}
		usb_otg_descriptor_init(cdev->gadget, usb_desc);
		otg_desc[0] = usb_desc;
		otg_desc[1] = NULL;
	}

	status = usb_add_config(cdev, &msg_config_driver, msg_do_config);
	if (status < 0)
		goto fail_otg_desc;

	usb_composite_overwrite_options(cdev, &coverwrite);
	dev_info(&cdev->gadget->dev,
		 DRIVER_DESC ", version: " DRIVER_VERSION "\n");
	return 0;

fail_otg_desc:
	kfree(otg_desc[0]);
	otg_desc[0] = NULL;
fail_string_ids:
	fsg_common_remove_luns(opts->common);
fail_set_cdev:
	fsg_common_free_buffers(opts->common);
fail:
	usb_put_function_instance(fi_msg);
	return status;
}

static int msg_unbind(struct usb_composite_dev *cdev)
{
	if (!IS_ERR(f_msg))
		usb_put_function(f_msg);

	if (!IS_ERR(fi_msg))
		usb_put_function_instance(fi_msg);

	kfree(otg_desc[0]);
	otg_desc[0] = NULL;

	return 0;
}

/****************************** Some noise ******************************/

static struct usb_composite_driver msg_driver = {
	.name		= "g_mass_storage",
	.dev		= &msg_device_desc,
	.max_speed	= USB_SPEED_SUPER_PLUS,
	.needs_serial	= 1,
	.strings	= dev_strings,
	.bind		= msg_bind,
	.unbind		= msg_unbind,
};

module_usb_composite_driver(msg_driver);

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_AUTHOR("Michal Nazarewicz");
MODULE_LICENSE("GPL");

Annotation

Implementation Notes