NAME

SYNOPSIS

DESCRIPTION

Storage devices

Wired network interfaces

Wireless network interfaces

Serial and parallel interfaces

Audio devices

Video devices

Time receiver devices

Radio receiver devices

Human Interface Devices

WAN network devices

Miscellaneous devices

INTRODUCTION TO USB

port

Number of the port on closest upstream hub.

configuration

Configuration the device must be in for this driver to attach. This locator does not set the configuration; it is iterated by the bus enumeration.

interface

Interface number within a device that an interface driver attaches to.

vendor

16-bit vendor ID of the device.

product

16-bit product ID of the device.

release

16-bit release (revision) number of the device.

1. Any device-specific driver can attach to the device.
2. If none is found, any device class specific driver can attach.
3. If none is found, all configurations are iterated over. For each configuration all the interfaces are iterated over and interface drivers can attach. If any interface driver attached in a certain configuration, the iteration over configurations is stopped.
4. If still no drivers have been found, the generic USB driver can attach.

USB CONTROLLER INTERFACE

#include <dev/usb/usb.h>

 

 

USB_DEVICEINFO struct usb_device_info

This command can be used to retrieve some information about a device on the bus. The udi_addr field should be filled before the call and the other fields will be filled by information about the device on that address. Should no such device exist, an error is reported.

#define USB_MAX_DEVNAMES 4 
#define USB_MAX_DEVNAMELEN 16 
struct usb_device_info { 
	u_int8_t	udi_bus; 
	u_int8_t	udi_addr;	/* device address */ 
	char		udi_product[USB_MAX_STRING_LEN]; 
	char		udi_vendor[USB_MAX_STRING_LEN]; 
	char		udi_release[8]; 
	u_int16_t	udi_productNo; 
	u_int16_t	udi_vendorNo; 
	u_int16_t	udi_releaseNo; 
	u_int8_t	udi_class; 
	u_int8_t	udi_subclass; 
	u_int8_t	udi_protocol; 
	u_int8_t	udi_config; 
	u_int8_t	udi_speed; 
#define USB_SPEED_LOW  1 
#define USB_SPEED_FULL 2 
#define USB_SPEED_HIGH 3 
	int		udi_power;	/* power consumption */ 
	int		udi_nports; 
	char		udi_devnames[USB_MAX_DEVNAMES] 
			    [USB_MAX_DEVNAMELEN]; 
	u_int8_t	udi_ports[16];	/* hub only */ 
#define USB_PORT_ENABLED 0xff 
#define USB_PORT_SUSPENDED 0xfe 
#define USB_PORT_POWERED 0xfd 
#define USB_PORT_DISABLED 0xfc 
	char		udi_serial[USB_MAX_STRING_LEN]; 
};
    

The udi_bus field contains the device unit number of the device.

The udi_product, udi_vendor, and udi_release fields contain self-explanatory descriptions of the device. The udi_productNo, udi_vendorNo, and udi_releaseNo fields contain numeric identifiers for the device.

The udi_class and udi_subclass fields contain the device class and subclass.

The udi_config field shows the current configuration of the device.

The udi_protocol field contains the device protocol as given from the device.

The udi_speed field contains the speed of the device.

The udi_power field shows the power consumption in milli-amps drawn at 5 volts or is zero if the device is self powered.

The udi_devnames field contains the names and instance numbers of the device drivers for the devices attached to this device.

If the device is a hub, the udi_nports field is non-zero and the udi_ports field contains the addresses of the connected devices. If no device is connected to a port, one of the USB_PORT_* values indicates its status.

 

 

USB_DEVICESTATS struct usb_device_stats

This command retrieves statistics about the controller.

struct usb_device_stats { 
	u_long	uds_requests[4]; 
};
    

The uds_requests field is indexed by the transfer kind, i.e. UE_*, and indicates how many transfers of each kind have been completed by the controller.

 

 

USB_DEVICE_GET_DDESC struct usb_device_ddesc

This command can be used to retrieve the device descriptor of a device on the bus. The udd_addr field needs to be filled with the bus device address:

struct usb_device_ddesc { 
	u_int8_t	udd_bus; 
	u_int8_t	udd_addr;	/* device address */ 
	usb_device_descriptor_t udd_desc; 
};
    

The udd_bus field contains the device unit number.

The udd_desc field contains the device descriptor structure.

 

 

USB_DEVICE_GET_CDESC struct usb_device_cdesc

This command can be used to retrieve the configuration descriptor for the given configuration of a device on the bus. The udc_addr field needs to be filled with the bus device address. The udc_config_index field needs to be filled with the configuration index for the relevant configuration descriptor. For convenience the current configuration can be specified by USB_CURRENT_CONFIG_INDEX:

struct usb_device_cdesc { 
	u_int8_t	udc_bus; 
	u_int8_t	udc_addr;	/* device address */ 
	int		udc_config_index; 
	usb_config_descriptor_t udc_desc; 
};
    

The udc_bus field contains the device unit number.

The udc_desc field contains the configuration descriptor structure.

 

 

USB_DEVICE_GET_FDESC struct usb_device_fdesc

This command can be used to retrieve all descriptors for the given configuration of a device on the bus. The udf_addr field needs to be filled with the bus device address. The udf_config_index field needs to be filled with the configuration index for the relevant configuration descriptor. For convenience the current configuration can be specified by USB_CURRENT_CONFIG_INDEX. The udf_data field needs to point to a memory area of the size given in the udf_size field. The proper size can be determined by first issuing a USB_DEVICE_GET_CDESC command and inspecting the wTotalLength field:

struct usb_device_fdesc { 
	u_int8_t	 udf_bus; 
	u_int8_t	 udf_addr;	/* device address */ 
	int		 udf_config_index; 
	u_int		 udf_size; 
	u_char		*udf_data; 
};
    

The udf_bus field contains the device unit number.

The udf_data field contains all descriptors.

 

 

USB_REQUEST struct usb_ctl_request

This command can be used to execute arbitrary requests on the control pipe. This is DANGEROUS and should be used with great care since it can destroy the bus integrity.

The usb_ctl_request structure has the following definition:

typedef struct { 
        uByte           bmRequestType; 
        uByte           bRequest; 
        uWord           wValue; 
        uWord           wIndex; 
        uWord           wLength; 
} __packed usb_device_request_t; 
 
struct usb_ctl_request { 
	int	ucr_addr; 
	usb_device_request_t ucr_request; 
	void	*ucr_data; 
	int	ucr_flags; 
#define USBD_SHORT_XFER_OK 0x04	/* allow short reads */ 
	int	ucr_actlen;	/* actual length transferred */ 
};
    

The ucr_addr field identifies the device on which to perform the request. The ucr_request field identifies parameters of the request, such as length and type. The ucr_data field contains the location where data will be read from or written to. The ucr_flags field specifies options for the request, and the ucr_actlen field contains the actual length transferred as the result of the request.

SEE ALSO

HISTORY