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334 lines
9.9 KiB
C
334 lines
9.9 KiB
C
#include "hid_keyboard.h"
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#include <string.h>
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#include "util/log.h"
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#define SC_HID_MOD_NONE 0x00
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#define SC_HID_MOD_LEFT_CONTROL (1 << 0)
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#define SC_HID_MOD_LEFT_SHIFT (1 << 1)
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#define SC_HID_MOD_LEFT_ALT (1 << 2)
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#define SC_HID_MOD_LEFT_GUI (1 << 3)
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#define SC_HID_MOD_RIGHT_CONTROL (1 << 4)
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#define SC_HID_MOD_RIGHT_SHIFT (1 << 5)
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#define SC_HID_MOD_RIGHT_ALT (1 << 6)
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#define SC_HID_MOD_RIGHT_GUI (1 << 7)
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#define SC_HID_KEYBOARD_INDEX_MODS 0
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#define SC_HID_KEYBOARD_INDEX_KEYS 2
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// USB HID protocol says 6 keys in an event is the requirement for BIOS
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// keyboard support, though OS could support more keys via modifying the report
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// desc. 6 should be enough for scrcpy.
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#define SC_HID_KEYBOARD_MAX_KEYS 6
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#define SC_HID_KEYBOARD_EVENT_SIZE \
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(SC_HID_KEYBOARD_INDEX_KEYS + SC_HID_KEYBOARD_MAX_KEYS)
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#define SC_HID_RESERVED 0x00
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#define SC_HID_ERROR_ROLL_OVER 0x01
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/**
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* For HID, only report descriptor is needed.
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*
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* The specification is available here:
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* <https://www.usb.org/sites/default/files/hid1_11.pdf>
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*
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* In particular, read:
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* - 6.2.2 Report Descriptor
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* - Appendix B.1 Protocol 1 (Keyboard)
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* - Appendix C: Keyboard Implementation
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*
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* Normally a basic HID keyboard uses 8 bytes:
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* Modifier Reserved Key Key Key Key Key Key
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*
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* You can dump your device's report descriptor with:
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*
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* sudo usbhid-dump -m vid:pid -e descriptor
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*
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* (change vid:pid' to your device's vendor ID and product ID).
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*/
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const uint8_t SC_HID_KEYBOARD_REPORT_DESC[] = {
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// Usage Page (Generic Desktop)
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0x05, 0x01,
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// Usage (Keyboard)
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0x09, 0x06,
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// Collection (Application)
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0xA1, 0x01,
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// Usage Page (Key Codes)
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0x05, 0x07,
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// Usage Minimum (224)
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0x19, 0xE0,
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// Usage Maximum (231)
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0x29, 0xE7,
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// Logical Minimum (0)
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0x15, 0x00,
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// Logical Maximum (1)
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0x25, 0x01,
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// Report Size (1)
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0x75, 0x01,
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// Report Count (8)
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0x95, 0x08,
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// Input (Data, Variable, Absolute): Modifier byte
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0x81, 0x02,
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// Report Size (8)
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0x75, 0x08,
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// Report Count (1)
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0x95, 0x01,
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// Input (Constant): Reserved byte
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0x81, 0x01,
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// Usage Page (LEDs)
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0x05, 0x08,
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// Usage Minimum (1)
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0x19, 0x01,
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// Usage Maximum (5)
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0x29, 0x05,
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// Report Size (1)
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0x75, 0x01,
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// Report Count (5)
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0x95, 0x05,
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// Output (Data, Variable, Absolute): LED report
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0x91, 0x02,
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// Report Size (3)
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0x75, 0x03,
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// Report Count (1)
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0x95, 0x01,
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// Output (Constant): LED report padding
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0x91, 0x01,
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// Usage Page (Key Codes)
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0x05, 0x07,
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// Usage Minimum (0)
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0x19, 0x00,
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// Usage Maximum (101)
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0x29, SC_HID_KEYBOARD_KEYS - 1,
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// Logical Minimum (0)
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0x15, 0x00,
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// Logical Maximum(101)
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0x25, SC_HID_KEYBOARD_KEYS - 1,
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// Report Size (8)
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0x75, 0x08,
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// Report Count (6)
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0x95, SC_HID_KEYBOARD_MAX_KEYS,
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// Input (Data, Array): Keys
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0x81, 0x00,
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// End Collection
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0xC0
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};
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const size_t SC_HID_KEYBOARD_REPORT_DESC_LEN =
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sizeof(SC_HID_KEYBOARD_REPORT_DESC);
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/**
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* A keyboard HID event is 8 bytes long:
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*
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* - byte 0: modifiers (1 flag per modifier key, 8 possible modifier keys)
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* - byte 1: reserved (always 0)
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* - bytes 2 to 7: pressed keys (6 at most)
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*
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* 7 6 5 4 3 2 1 0
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* +---------------+
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* byte 0: |. . . . . . . .| modifiers
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* +---------------+
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* ^ ^ ^ ^ ^ ^ ^ ^
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* | | | | | | | `- left Ctrl
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* | | | | | | `--- left Shift
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* | | | | | `----- left Alt
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* | | | | `------- left Gui
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* | | | `--------- right Ctrl
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* | | `----------- right Shift
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* | `------------- right Alt
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* `--------------- right Gui
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*
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* +---------------+
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* byte 1: |0 0 0 0 0 0 0 0| reserved
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* +---------------+
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*
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* +---------------+
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* bytes 2 to 7: |. . . . . . . .| scancode of 1st key pressed
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* +---------------+
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* |. . . . . . . .| scancode of 2nd key pressed
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* +---------------+
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* |. . . . . . . .| scancode of 3rd key pressed
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* +---------------+
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* |. . . . . . . .| scancode of 4th key pressed
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* +---------------+
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* |. . . . . . . .| scancode of 5th key pressed
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* +---------------+
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* |. . . . . . . .| scancode of 6th key pressed
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* +---------------+
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*
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* If there are less than 6 keys pressed, the last items are set to 0.
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* For example, if A and W are pressed:
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*
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* +---------------+
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* bytes 2 to 7: |0 0 0 0 0 1 0 0| A is pressed (scancode = 4)
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* +---------------+
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* |0 0 0 1 1 0 1 0| W is pressed (scancode = 26)
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* +---------------+
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* |0 0 0 0 0 0 0 0| ^
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* +---------------+ | only 2 keys are pressed, the
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* |0 0 0 0 0 0 0 0| | remaining items are set to 0
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* +---------------+ |
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* |0 0 0 0 0 0 0 0| |
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* +---------------+ |
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* |0 0 0 0 0 0 0 0| v
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* +---------------+
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*
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* Pressing more than 6 keys is not supported. If this happens (typically,
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* never in practice), report a "phantom state":
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*
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* +---------------+
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* bytes 2 to 7: |0 0 0 0 0 0 0 1| ^
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* +---------------+ |
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* |0 0 0 0 0 0 0 1| | more than 6 keys pressed:
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* +---------------+ | the list is filled with a special
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* |0 0 0 0 0 0 0 1| | rollover error code (0x01)
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* +---------------+ |
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* |0 0 0 0 0 0 0 1| |
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* +---------------+ |
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* |0 0 0 0 0 0 0 1| |
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* +---------------+ |
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* |0 0 0 0 0 0 0 1| v
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* +---------------+
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*/
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static void
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sc_hid_keyboard_event_init(struct sc_hid_event *hid_event) {
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hid_event->size = SC_HID_KEYBOARD_EVENT_SIZE;
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uint8_t *data = hid_event->data;
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data[SC_HID_KEYBOARD_INDEX_MODS] = SC_HID_MOD_NONE;
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data[1] = SC_HID_RESERVED;
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memset(&data[SC_HID_KEYBOARD_INDEX_KEYS], 0, SC_HID_KEYBOARD_MAX_KEYS);
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}
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static uint16_t
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sc_hid_mod_from_sdl_keymod(uint16_t mod) {
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uint16_t mods = SC_HID_MOD_NONE;
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if (mod & SC_MOD_LCTRL) {
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mods |= SC_HID_MOD_LEFT_CONTROL;
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}
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if (mod & SC_MOD_LSHIFT) {
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mods |= SC_HID_MOD_LEFT_SHIFT;
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}
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if (mod & SC_MOD_LALT) {
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mods |= SC_HID_MOD_LEFT_ALT;
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}
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if (mod & SC_MOD_LGUI) {
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mods |= SC_HID_MOD_LEFT_GUI;
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}
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if (mod & SC_MOD_RCTRL) {
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mods |= SC_HID_MOD_RIGHT_CONTROL;
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}
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if (mod & SC_MOD_RSHIFT) {
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mods |= SC_HID_MOD_RIGHT_SHIFT;
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}
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if (mod & SC_MOD_RALT) {
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mods |= SC_HID_MOD_RIGHT_ALT;
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}
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if (mod & SC_MOD_RGUI) {
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mods |= SC_HID_MOD_RIGHT_GUI;
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}
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return mods;
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}
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void
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sc_hid_keyboard_init(struct sc_hid_keyboard *hid) {
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memset(hid->keys, false, SC_HID_KEYBOARD_KEYS);
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}
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static inline bool
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scancode_is_modifier(enum sc_scancode scancode) {
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return scancode >= SC_SCANCODE_LCTRL && scancode <= SC_SCANCODE_RGUI;
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}
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bool
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sc_hid_keyboard_event_from_key(struct sc_hid_keyboard *hid,
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struct sc_hid_event *hid_event,
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const struct sc_key_event *event) {
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enum sc_scancode scancode = event->scancode;
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assert(scancode >= 0);
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// SDL also generates events when only modifiers are pressed, we cannot
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// ignore them totally, for example press 'a' first then press 'Control',
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// if we ignore 'Control' event, only 'a' is sent.
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if (scancode >= SC_HID_KEYBOARD_KEYS && !scancode_is_modifier(scancode)) {
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// Scancode to ignore
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return false;
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}
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sc_hid_keyboard_event_init(hid_event);
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uint16_t mods = sc_hid_mod_from_sdl_keymod(event->mods_state);
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if (scancode < SC_HID_KEYBOARD_KEYS) {
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// Pressed is true and released is false
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hid->keys[scancode] = (event->action == SC_ACTION_DOWN);
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LOGV("keys[%02x] = %s", scancode,
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hid->keys[scancode] ? "true" : "false");
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}
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hid_event->data[SC_HID_KEYBOARD_INDEX_MODS] = mods;
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uint8_t *keys_data = &hid_event->data[SC_HID_KEYBOARD_INDEX_KEYS];
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// Re-calculate pressed keys every time
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int keys_pressed_count = 0;
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for (int i = 0; i < SC_HID_KEYBOARD_KEYS; ++i) {
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if (hid->keys[i]) {
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// USB HID protocol says that if keys exceeds report count, a
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// phantom state should be reported
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if (keys_pressed_count >= SC_HID_KEYBOARD_MAX_KEYS) {
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// Phantom state:
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// - Modifiers
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// - Reserved
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// - ErrorRollOver * HID_MAX_KEYS
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memset(keys_data, SC_HID_ERROR_ROLL_OVER,
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SC_HID_KEYBOARD_MAX_KEYS);
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goto end;
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}
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keys_data[keys_pressed_count] = i;
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++keys_pressed_count;
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}
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}
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end:
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LOGV("hid keyboard: key %-4s scancode=%02x (%u) mod=%02x",
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event->action == SC_ACTION_DOWN ? "down" : "up", event->scancode,
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event->scancode, mods);
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return true;
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}
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bool
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sc_hid_keyboard_event_from_mods(struct sc_hid_event *event,
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uint16_t mods_state) {
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bool capslock = mods_state & SC_MOD_CAPS;
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bool numlock = mods_state & SC_MOD_NUM;
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if (!capslock && !numlock) {
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// Nothing to do
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return false;
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}
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sc_hid_keyboard_event_init(event);
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unsigned i = 0;
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if (capslock) {
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event->data[SC_HID_KEYBOARD_INDEX_KEYS + i] = SC_SCANCODE_CAPSLOCK;
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++i;
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}
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if (numlock) {
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event->data[SC_HID_KEYBOARD_INDEX_KEYS + i] = SC_SCANCODE_NUMLOCK;
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++i;
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}
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return true;
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}
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