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#ifndef _USBKBD_H
#define _USBKBD_H
/** @file
*
* USB keyboard driver
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <assert.h>
#include <ipxe/usb.h>
#include <ipxe/usbhid.h>
/** Keyboard protocol */
#define USBKBD_PROTOCOL 1
/** A USB keyboard report */
struct usb_keyboard_report {
/** Modifier keys */
uint8_t modifiers;
/** Reserved */
uint8_t reserved;
/** Keycodes */
uint8_t keycode[6];
} __attribute__ (( packed ));
/** USB modifier keys */
enum usb_keyboard_modifier {
/** Left Ctrl key */
USBKBD_CTRL_LEFT = 0x01,
/** Left Shift key */
USBKBD_SHIFT_LEFT = 0x02,
/** Left Alt key */
USBKBD_ALT_LEFT = 0x04,
/** Left GUI key */
USBKBD_GUI_LEFT = 0x08,
/** Right Ctrl key */
USBKBD_CTRL_RIGHT = 0x10,
/** Right Shift key */
USBKBD_SHIFT_RIGHT = 0x20,
/** Right Alt key */
USBKBD_ALT_RIGHT = 0x40,
/** Right GUI key */
USBKBD_GUI_RIGHT = 0x80,
};
/** Either Ctrl key */
#define USBKBD_CTRL ( USBKBD_CTRL_LEFT | USBKBD_CTRL_RIGHT )
/** Either Shift key */
#define USBKBD_SHIFT ( USBKBD_SHIFT_LEFT | USBKBD_SHIFT_RIGHT )
/** Either Alt key */
#define USBKBD_ALT ( USBKBD_ALT_LEFT | USBKBD_ALT_RIGHT )
/** Either GUI key */
#define USBKBD_GUI ( USBKBD_GUI_LEFT | USBKBD_GUI_RIGHT )
/** USB keycodes */
enum usb_keycode {
USBKBD_KEY_A = 0x04,
USBKBD_KEY_Z = 0x1d,
USBKBD_KEY_1 = 0x1e,
USBKBD_KEY_0 = 0x27,
USBKBD_KEY_ENTER = 0x28,
USBKBD_KEY_SPACE = 0x2c,
USBKBD_KEY_MINUS = 0x2d,
USBKBD_KEY_SLASH = 0x38,
USBKBD_KEY_CAPSLOCK = 0x39,
USBKBD_KEY_UP = 0x52,
};
/** Keyboard idle duration (in 4ms units)
*
* This is a policy decision. We choose to use an autorepeat rate of
* approximately 40ms.
*/
#define USBKBD_IDLE_DURATION 10 /* 10 x 4ms = 40ms */
/** Keyboard auto-repeat hold-off (in units of USBKBD_IDLE_DURATION)
*
* This is a policy decision. We choose to use an autorepeat delay of
* approximately 500ms.
*/
#define USBKBD_HOLDOFF 12 /* 12 x 40ms = 480ms */
/** Interrupt endpoint maximum fill level
*
* When idling, we are likely to poll the USB endpoint at only the
* 18.2Hz system timer tick rate. With a typical observed bInterval
* of 10ms (which will be rounded down to 8ms by the HCI drivers),
* this gives approximately 7 completions per poll.
*/
#define USBKBD_INTR_MAX_FILL 8
/** Keyboard buffer size
*
* Must be a power of two.
*/
#define USBKBD_BUFSIZE 8
/** A USB keyboard device */
struct usb_keyboard {
/** Name */
const char *name;
/** List of all USB keyboards */
struct list_head list;
/** USB bus */
struct usb_bus *bus;
/** USB human interface device */
struct usb_hid hid;
/** Most recent keyboard report */
struct usb_keyboard_report report;
/** Most recently pressed non-modifier key (if any) */
unsigned int keycode;
/** Autorepeat hold-off time (in number of completions reported) */
unsigned int holdoff;
/** Keyboard buffer
*
* This stores iPXE key values.
*/
unsigned int key[USBKBD_BUFSIZE];
/** Keyboard buffer producer counter */
unsigned int prod;
/** Keyboard buffer consumer counter */
unsigned int cons;
/** Keyboard buffer sub-consumer counter
*
* This represents the index within the ANSI escape sequence
* corresponding to an iPXE key value.
*/
unsigned int subcons;
};
/**
* Calculate keyboard buffer fill level
*
* @v kbd USB keyboard
* @ret fill Keyboard buffer fill level
*/
static inline __attribute__ (( always_inline )) unsigned int
usbkbd_fill ( struct usb_keyboard *kbd ) {
unsigned int fill = ( kbd->prod - kbd->cons );
assert ( fill <= USBKBD_BUFSIZE );
return fill;
}
#endif /* _USBKBD_H */
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