76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
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#include <asm/types.h>
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#include <asm/ioctl.h>
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#include <linux/usb/ch9.h>
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/*
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* Filesystem based user-mode API to USB Gadget controller hardware
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*
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* Almost everything can be done with only read and write operations,
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* on endpoint files found in one directory. They are configured by
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* writing descriptors, and then may be used for normal stream style
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* i/o requests. When ep0 is configured, the device can enumerate;
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* when it's closed, the device disconnects from usb.
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*
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* Configuration and device descriptors get written to /dev/gadget/$CHIP,
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* which may then be used to read usb_gadgetfs_event structs. The driver
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* may activate endpoints as it handles SET_CONFIGURATION setup events,
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* or earlier; writing endpoint descriptors to /dev/gadget/$ENDPOINT
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* then performing data transfers by reading or writing.
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*/
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/*
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* Events are delivered on the ep0 file descriptor, if the user mode driver
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* reads from this file descriptor after writing the descriptors. Don't
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* stop polling this descriptor, if you write that kind of driver.
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*/
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enum usb_gadgetfs_event_type {
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GADGETFS_NOP = 0,
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GADGETFS_CONNECT,
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GADGETFS_DISCONNECT,
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GADGETFS_SETUP,
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GADGETFS_SUSPEND,
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// and likely more !
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};
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struct usb_gadgetfs_event {
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enum usb_gadgetfs_event_type type;
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union {
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// NOP, DISCONNECT, SUSPEND: nothing
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// ... some hardware can't report disconnection
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// CONNECT: just the speed
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enum usb_device_speed speed;
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// SETUP: packet; DATA phase i/o precedes next event
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// (setup.bmRequestType & USB_DIR_IN) flags direction
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// ... includes SET_CONFIGURATION, SET_INTERFACE
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struct usb_ctrlrequest setup;
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} u;
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};
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/* endpoint ioctls */
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/* IN transfers may be reported to the gadget driver as complete
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* when the fifo is loaded, before the host reads the data;
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* OUT transfers may be reported to the host's "client" driver as
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* complete when they're sitting in the FIFO unread.
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* THIS returns how many bytes are "unclaimed" in the endpoint fifo
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* (needed for precise fault handling, when the hardware allows it)
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*/
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#define GADGETFS_FIFO_STATUS _IO('g',1)
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/* discards any unclaimed data in the fifo. */
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#define GADGETFS_FIFO_FLUSH _IO('g',2)
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/* resets endpoint halt+toggle; used to implement set_interface.
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* some hardware (like pxa2xx) can't support this.
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*/
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#define GADGETFS_CLEAR_HALT _IO('g',3)
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