267 lines
7.5 KiB
C
267 lines
7.5 KiB
C
#include "hid_mouse.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 mouse processor to hid_mouse */
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#define DOWNCAST(MP) container_of(MP, struct sc_hid_mouse, mouse_processor)
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#define HID_MOUSE_ACCESSORY_ID 2
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// 1 byte for buttons + padding, 1 byte for X position, 1 byte for Y position
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#define HID_MOUSE_EVENT_SIZE 4
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/**
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* Mouse descriptor from the specification:
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* <https://www.usb.org/sites/default/files/hid1_11.pdf>
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*
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* Appendix E (p71): §E.10 Report Descriptor (Mouse)
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*
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* The usage tags (like Wheel) are listed in "HID Usage Tables":
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* <https://www.usb.org/sites/default/files/documents/hut1_12v2.pdf>
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* §4 Generic Desktop Page (0x01) (p26)
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*/
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static const unsigned char mouse_report_desc[] = {
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// Usage Page (Generic Desktop)
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0x05, 0x01,
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// Usage (Mouse)
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0x09, 0x02,
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// Collection (Application)
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0xA1, 0x01,
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// Usage (Pointer)
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0x09, 0x01,
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// Collection (Physical)
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0xA1, 0x00,
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// Usage Page (Buttons)
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0x05, 0x09,
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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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// 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 Count (5)
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0x95, 0x05,
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// Report Size (1)
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0x75, 0x01,
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// Input (Data, Variable, Absolute): 5 buttons bits
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0x81, 0x02,
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// Report Count (1)
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0x95, 0x01,
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// Report Size (3)
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0x75, 0x03,
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// Input (Constant): 3 bits padding
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0x81, 0x01,
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// Usage Page (Generic Desktop)
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0x05, 0x01,
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// Usage (X)
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0x09, 0x30,
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// Usage (Y)
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0x09, 0x31,
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// Usage (Wheel)
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0x09, 0x38,
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// Local Minimum (-127)
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0x15, 0x81,
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// Local Maximum (127)
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0x25, 0x7F,
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// Report Size (8)
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0x75, 0x08,
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// Report Count (3)
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0x95, 0x03,
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// Input (Data, Variable, Relative): 3 position bytes (X, Y, Wheel)
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0x81, 0x06,
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// End Collection
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0xC0,
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// End Collection
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0xC0,
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};
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/**
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* A mouse HID event is 3 bytes long:
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*
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* - byte 0: buttons state
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* - byte 1: relative x motion (signed byte from -127 to 127)
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* - byte 2: relative y motion (signed byte from -127 to 127)
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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: |0 0 0 . . . . .| buttons state
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* +---------------+
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* ^ ^ ^ ^ ^
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* | | | | `- left button
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* | | | `--- right button
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* | | `----- middle button
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* | `------- button 4
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* `--------- button 5
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*
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* +---------------+
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* byte 1: |. . . . . . . .| relative x motion
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* +---------------+
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* byte 2: |. . . . . . . .| relative y motion
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* +---------------+
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* byte 3: |. . . . . . . .| wheel motion (-1, 0 or 1)
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* +---------------+
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*
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* As an example, here is the report for a motion of (x=5, y=-4) with left
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* button pressed:
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*
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* +---------------+
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* |0 0 0 0 0 0 0 1| left button pressed
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* +---------------+
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* |0 0 0 0 0 1 0 1| horizontal motion (x = 5)
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* +---------------+
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* |1 1 1 1 1 1 0 0| relative y motion (y = -4)
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* +---------------+
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* |0 0 0 0 0 0 0 0| wheel motion
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* +---------------+
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*/
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static bool
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sc_hid_mouse_event_init(struct sc_hid_event *hid_event) {
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unsigned char *buffer = calloc(1, HID_MOUSE_EVENT_SIZE);
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if (!buffer) {
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LOG_OOM();
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return false;
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}
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sc_hid_event_init(hid_event, HID_MOUSE_ACCESSORY_ID, buffer,
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HID_MOUSE_EVENT_SIZE);
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return true;
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}
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static unsigned char
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buttons_state_to_hid_buttons(uint8_t buttons_state) {
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unsigned char c = 0;
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if (buttons_state & SC_MOUSE_BUTTON_LEFT) {
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c |= 1 << 0;
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}
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if (buttons_state & SC_MOUSE_BUTTON_RIGHT) {
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c |= 1 << 1;
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}
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if (buttons_state & SC_MOUSE_BUTTON_MIDDLE) {
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c |= 1 << 2;
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}
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if (buttons_state & SC_MOUSE_BUTTON_X1) {
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c |= 1 << 3;
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}
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if (buttons_state & SC_MOUSE_BUTTON_X2) {
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c |= 1 << 4;
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}
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return c;
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}
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static void
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sc_mouse_processor_process_mouse_motion(struct sc_mouse_processor *mp,
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const struct sc_mouse_motion_event *event) {
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struct sc_hid_mouse *mouse = DOWNCAST(mp);
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struct sc_hid_event hid_event;
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if (!sc_hid_mouse_event_init(&hid_event)) {
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return;
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}
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unsigned char *buffer = hid_event.buffer;
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buffer[0] = buttons_state_to_hid_buttons(event->buttons_state);
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buffer[1] = CLAMP(event->xrel, -127, 127);
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buffer[2] = CLAMP(event->yrel, -127, 127);
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buffer[3] = 0; // wheel coordinates only used for scrolling
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if (!sc_aoa_push_hid_event(mouse->aoa, &hid_event)) {
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sc_hid_event_destroy(&hid_event);
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LOGW("Could not request HID event (mouse motion)");
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}
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}
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static void
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sc_mouse_processor_process_mouse_click(struct sc_mouse_processor *mp,
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const struct sc_mouse_click_event *event) {
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struct sc_hid_mouse *mouse = DOWNCAST(mp);
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struct sc_hid_event hid_event;
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if (!sc_hid_mouse_event_init(&hid_event)) {
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return;
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}
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unsigned char *buffer = hid_event.buffer;
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buffer[0] = buttons_state_to_hid_buttons(event->buttons_state);
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buffer[1] = 0; // no x motion
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buffer[2] = 0; // no y motion
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buffer[3] = 0; // wheel coordinates only used for scrolling
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if (!sc_aoa_push_hid_event(mouse->aoa, &hid_event)) {
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sc_hid_event_destroy(&hid_event);
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LOGW("Could not request HID event (mouse click)");
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}
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}
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static void
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sc_mouse_processor_process_mouse_scroll(struct sc_mouse_processor *mp,
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const struct sc_mouse_scroll_event *event) {
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struct sc_hid_mouse *mouse = DOWNCAST(mp);
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struct sc_hid_event hid_event;
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if (!sc_hid_mouse_event_init(&hid_event)) {
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return;
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}
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unsigned char *buffer = hid_event.buffer;
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buffer[0] = 0; // buttons state irrelevant (and unknown)
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buffer[1] = 0; // no x motion
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buffer[2] = 0; // no y motion
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// In practice, vscroll is always -1, 0 or 1, but in theory other values
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// are possible
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buffer[3] = CLAMP(event->vscroll, -127, 127);
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// Horizontal scrolling ignored
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if (!sc_aoa_push_hid_event(mouse->aoa, &hid_event)) {
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sc_hid_event_destroy(&hid_event);
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LOGW("Could not request HID event (mouse scroll)");
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}
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}
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bool
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sc_hid_mouse_init(struct sc_hid_mouse *mouse, struct sc_aoa *aoa) {
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mouse->aoa = aoa;
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bool ok = sc_aoa_setup_hid(aoa, HID_MOUSE_ACCESSORY_ID, mouse_report_desc,
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ARRAY_LEN(mouse_report_desc));
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if (!ok) {
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LOGW("Register HID mouse failed");
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return false;
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}
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static const struct sc_mouse_processor_ops ops = {
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.process_mouse_motion = sc_mouse_processor_process_mouse_motion,
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.process_mouse_click = sc_mouse_processor_process_mouse_click,
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.process_mouse_scroll = sc_mouse_processor_process_mouse_scroll,
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// Touch events not supported (coordinates are not relative)
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.process_touch = NULL,
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};
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mouse->mouse_processor.ops = &ops;
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mouse->mouse_processor.relative_mode = true;
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return true;
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}
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void
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sc_hid_mouse_destroy(struct sc_hid_mouse *mouse) {
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bool ok = sc_aoa_unregister_hid(mouse->aoa, HID_MOUSE_ACCESSORY_ID);
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if (!ok) {
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LOGW("Could not unregister HID mouse");
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}
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}
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