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419 lines
13 KiB
C
419 lines
13 KiB
C
#include "hid_keyboard.h"
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#include <assert.h>
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#include "input_events.h"
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#include "util/log.h"
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/** Downcast key processor to hid_keyboard */
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#define DOWNCAST(KP) container_of(KP, struct sc_hid_keyboard, key_processor)
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#define HID_KEYBOARD_ACCESSORY_ID 1
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#define HID_MODIFIER_NONE 0x00
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#define HID_MODIFIER_LEFT_CONTROL (1 << 0)
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#define HID_MODIFIER_LEFT_SHIFT (1 << 1)
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#define HID_MODIFIER_LEFT_ALT (1 << 2)
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#define HID_MODIFIER_LEFT_GUI (1 << 3)
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#define HID_MODIFIER_RIGHT_CONTROL (1 << 4)
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#define HID_MODIFIER_RIGHT_SHIFT (1 << 5)
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#define HID_MODIFIER_RIGHT_ALT (1 << 6)
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#define HID_MODIFIER_RIGHT_GUI (1 << 7)
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#define HID_KEYBOARD_INDEX_MODIFIER 0
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#define 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 HID_KEYBOARD_MAX_KEYS 6
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#define HID_KEYBOARD_EVENT_SIZE \
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(HID_KEYBOARD_INDEX_KEYS + HID_KEYBOARD_MAX_KEYS)
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#define HID_RESERVED 0x00
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#define HID_ERROR_ROLL_OVER 0x01
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/**
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* For HID over AOAv2, 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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static const unsigned char 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, 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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/**
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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 unsigned char
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sdl_keymod_to_hid_modifiers(uint16_t mod) {
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unsigned char modifiers = HID_MODIFIER_NONE;
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if (mod & SC_MOD_LCTRL) {
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modifiers |= HID_MODIFIER_LEFT_CONTROL;
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}
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if (mod & SC_MOD_LSHIFT) {
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modifiers |= HID_MODIFIER_LEFT_SHIFT;
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}
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if (mod & SC_MOD_LALT) {
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modifiers |= HID_MODIFIER_LEFT_ALT;
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}
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if (mod & SC_MOD_LGUI) {
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modifiers |= HID_MODIFIER_LEFT_GUI;
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}
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if (mod & SC_MOD_RCTRL) {
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modifiers |= HID_MODIFIER_RIGHT_CONTROL;
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}
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if (mod & SC_MOD_RSHIFT) {
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modifiers |= HID_MODIFIER_RIGHT_SHIFT;
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}
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if (mod & SC_MOD_RALT) {
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modifiers |= HID_MODIFIER_RIGHT_ALT;
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}
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if (mod & SC_MOD_RGUI) {
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modifiers |= HID_MODIFIER_RIGHT_GUI;
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}
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return modifiers;
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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 = HID_KEYBOARD_EVENT_SIZE;
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uint8_t *data = hid_event->data;
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data[HID_KEYBOARD_INDEX_MODIFIER] = HID_MODIFIER_NONE;
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data[1] = HID_RESERVED;
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memset(&data[HID_KEYBOARD_INDEX_KEYS], 0, HID_KEYBOARD_MAX_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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static bool
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convert_hid_keyboard_event(struct sc_hid_keyboard *kb,
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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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unsigned char modifiers = sdl_keymod_to_hid_modifiers(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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kb->keys[scancode] = (event->action == SC_ACTION_DOWN);
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LOGV("keys[%02x] = %s", scancode,
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kb->keys[scancode] ? "true" : "false");
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}
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hid_event->data[HID_KEYBOARD_INDEX_MODIFIER] = modifiers;
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unsigned char *keys_data = &hid_event->data[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 (kb->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 >= 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, HID_ERROR_ROLL_OVER, 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, modifiers);
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return true;
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}
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static bool
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push_mod_lock_state(struct sc_hid_keyboard *kb, 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 true;
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}
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struct sc_hid_event hid_event;
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sc_hid_keyboard_event_init(&hid_event);
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unsigned i = 0;
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if (capslock) {
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hid_event.data[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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hid_event.data[HID_KEYBOARD_INDEX_KEYS + i] = SC_SCANCODE_NUMLOCK;
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++i;
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}
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if (!sc_aoa_push_hid_event(kb->aoa, HID_KEYBOARD_ACCESSORY_ID,
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&hid_event)) {
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LOGW("Could not request HID event (mod lock state)");
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return false;
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}
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LOGD("HID keyboard state synchronized");
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return true;
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}
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static void
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sc_key_processor_process_key(struct sc_key_processor *kp,
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const struct sc_key_event *event,
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uint64_t ack_to_wait) {
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if (event->repeat) {
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// In USB HID protocol, key repeat is handled by the host (Android), so
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// just ignore key repeat here.
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return;
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}
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struct sc_hid_keyboard *kb = DOWNCAST(kp);
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struct sc_hid_event hid_event;
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// Not all keys are supported, just ignore unsupported keys
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if (convert_hid_keyboard_event(kb, &hid_event, event)) {
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if (!kb->mod_lock_synchronized) {
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// Inject CAPSLOCK and/or NUMLOCK if necessary to synchronize
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// keyboard state
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if (push_mod_lock_state(kb, event->mods_state)) {
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kb->mod_lock_synchronized = true;
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}
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}
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// If ack_to_wait is != SC_SEQUENCE_INVALID, then Ctrl+v is pressed, so
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// clipboard synchronization has been requested. Wait until clipboard
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// synchronization is acknowledged by the server, otherwise it could
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// paste the old clipboard content.
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if (!sc_aoa_push_hid_event_with_ack_to_wait(kb->aoa,
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HID_KEYBOARD_ACCESSORY_ID,
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&hid_event,
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ack_to_wait)) {
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LOGW("Could not request HID event (key)");
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}
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}
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}
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bool
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sc_hid_keyboard_init(struct sc_hid_keyboard *kb, struct sc_aoa *aoa) {
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kb->aoa = aoa;
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bool ok = sc_aoa_setup_hid(aoa, HID_KEYBOARD_ACCESSORY_ID,
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keyboard_report_desc,
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ARRAY_LEN(keyboard_report_desc));
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if (!ok) {
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LOGW("Register HID keyboard failed");
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return false;
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}
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// Reset all states
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memset(kb->keys, false, SC_HID_KEYBOARD_KEYS);
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kb->mod_lock_synchronized = false;
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static const struct sc_key_processor_ops ops = {
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.process_key = sc_key_processor_process_key,
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// Never forward text input via HID (all the keys are injected
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// separately)
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.process_text = NULL,
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};
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// Clipboard synchronization is requested over the control socket, while HID
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// events are sent over AOA, so it must wait for clipboard synchronization
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// to be acknowledged by the device before injecting Ctrl+v.
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kb->key_processor.async_paste = true;
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kb->key_processor.ops = &ops;
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return true;
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}
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void
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sc_hid_keyboard_destroy(struct sc_hid_keyboard *kb) {
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// Unregister HID keyboard so the soft keyboard shows again on Android
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bool ok = sc_aoa_unregister_hid(kb->aoa, HID_KEYBOARD_ACCESSORY_ID);
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if (!ok) {
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LOGW("Could not unregister HID keyboard");
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}
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}
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