[Maintenance] USB HID control packet as struct (#21688)
* ChibiOS: USB HID control request as dedicated struct Instead of accessing the raw USB setup packet and documenting the values as the corresponding USB HID control request fields we introduce a struct that allows direct access to the fields. This is safer and self documenting. * Rename usb_request.h to usb_types.h In the future all shared USB data types can live in this file.
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Stefan Kerkmann
GitHub
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64d1ce751f
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5856d5e13b
@ -43,6 +43,7 @@
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#include "usb_device_state.h"
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#include "usb_descriptor.h"
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#include "usb_driver.h"
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#include "usb_types.h"
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#ifdef NKRO_ENABLE
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# include "keycode_config.h"
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@ -103,30 +104,18 @@ union {
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NULL, /* SETUP buffer (not a SETUP endpoint) */
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#endif
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/* HID specific constants */
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#define HID_GET_REPORT 0x01
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#define HID_GET_IDLE 0x02
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#define HID_GET_PROTOCOL 0x03
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#define HID_SET_REPORT 0x09
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#define HID_SET_IDLE 0x0A
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#define HID_SET_PROTOCOL 0x0B
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/*
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* Handles the GET_DESCRIPTOR callback
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*
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* Returns the proper descriptor
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*/
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static const USBDescriptor *usb_get_descriptor_cb(USBDriver *usbp, uint8_t dtype, uint8_t dindex, uint16_t wIndex) {
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(void)usbp;
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static USBDescriptor desc;
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uint16_t wValue = ((uint16_t)dtype << 8) | dindex;
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uint16_t wLength = ((uint16_t)usbp->setup[7] << 8) | usbp->setup[6];
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desc.ud_string = NULL;
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desc.ud_size = get_usb_descriptor(wValue, wIndex, wLength, (const void **const) & desc.ud_string);
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if (desc.ud_string == NULL)
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usb_control_request_t *setup = (usb_control_request_t *)usbp->setup;
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static USBDescriptor descriptor;
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descriptor.ud_string = NULL;
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descriptor.ud_size = get_usb_descriptor(setup->wValue.word, setup->wIndex, setup->wLength, (const void **const) & descriptor.ud_string);
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if (descriptor.ud_string == NULL) {
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return NULL;
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else
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return &desc;
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}
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return &descriptor;
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}
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/*
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@ -497,8 +486,7 @@ void usb_event_queue_task(void) {
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}
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}
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/* Handles the USB driver global events
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* TODO: maybe disable some things when connection is lost? */
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/* Handles the USB driver global events. */
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static void usb_event_cb(USBDriver *usbp, usbevent_t event) {
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switch (event) {
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case USB_EVENT_ADDRESS:
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@ -570,16 +558,6 @@ static void usb_event_cb(USBDriver *usbp, usbevent_t event) {
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}
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}
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/* Function used locally in os/hal/src/usb.c for getting descriptors
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* need it here for HID descriptor */
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static uint16_t get_hword(uint8_t *p) {
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uint16_t hw;
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hw = (uint16_t)*p++;
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hw |= (uint16_t)*p << 8U;
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return hw;
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}
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/*
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* Appendix G: HID Request Support Requirements
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*
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@ -596,7 +574,9 @@ static uint16_t get_hword(uint8_t *p) {
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static uint8_t set_report_buf[2] __attribute__((aligned(4)));
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static void set_led_transfer_cb(USBDriver *usbp) {
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if (usbp->setup[6] == 2) { /* LSB(wLength) */
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usb_control_request_t *setup = (usb_control_request_t *)usbp->setup;
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if (setup->wLength == 2) {
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uint8_t report_id = set_report_buf[0];
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if ((report_id == REPORT_ID_KEYBOARD) || (report_id == REPORT_ID_NKRO)) {
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keyboard_led_state = set_report_buf[1];
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@ -606,24 +586,16 @@ static void set_led_transfer_cb(USBDriver *usbp) {
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}
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}
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/* Callback for SETUP request on the endpoint 0 (control) */
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static bool usb_request_hook_cb(USBDriver *usbp) {
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const USBDescriptor *dp;
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/* usbp->setup fields:
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* 0: bmRequestType (bitmask)
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* 1: bRequest
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* 2,3: (LSB,MSB) wValue
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* 4,5: (LSB,MSB) wIndex
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* 6,7: (LSB,MSB) wLength (number of bytes to transfer if there is a data phase) */
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static bool usb_requests_hook_cb(USBDriver *usbp) {
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usb_control_request_t *setup = (usb_control_request_t *)usbp->setup;
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/* Handle HID class specific requests */
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if (((usbp->setup[0] & USB_RTYPE_TYPE_MASK) == USB_RTYPE_TYPE_CLASS) && ((usbp->setup[0] & USB_RTYPE_RECIPIENT_MASK) == USB_RTYPE_RECIPIENT_INTERFACE)) {
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switch (usbp->setup[0] & USB_RTYPE_DIR_MASK) {
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if ((setup->bmRequestType & (USB_RTYPE_TYPE_MASK | USB_RTYPE_RECIPIENT_MASK)) == (USB_RTYPE_TYPE_CLASS | USB_RTYPE_RECIPIENT_INTERFACE)) {
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switch (setup->bmRequestType & USB_RTYPE_DIR_MASK) {
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case USB_RTYPE_DIR_DEV2HOST:
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switch (usbp->setup[1]) { /* bRequest */
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case HID_GET_REPORT:
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switch (usbp->setup[4]) { /* LSB(wIndex) (check MSB==0?) */
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switch (setup->bRequest) {
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case HID_REQ_GetReport:
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switch (setup->wIndex) {
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#ifndef KEYBOARD_SHARED_EP
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case KEYBOARD_INTERFACE:
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usbSetupTransfer(usbp, (uint8_t *)&keyboard_report_sent, KEYBOARD_REPORT_SIZE, NULL);
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@ -639,59 +611,54 @@ static bool usb_request_hook_cb(USBDriver *usbp) {
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#ifdef SHARED_EP_ENABLE
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case SHARED_INTERFACE:
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# ifdef KEYBOARD_SHARED_EP
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if (usbp->setup[2] == REPORT_ID_KEYBOARD) {
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if (setup->wValue.lbyte == REPORT_ID_KEYBOARD) {
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usbSetupTransfer(usbp, (uint8_t *)&keyboard_report_sent, KEYBOARD_REPORT_SIZE, NULL);
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return TRUE;
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break;
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return true;
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}
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# endif
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# ifdef MOUSE_SHARED_EP
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if (usbp->setup[2] == REPORT_ID_MOUSE) {
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if (setup->wValue.lbyte == REPORT_ID_MOUSE) {
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usbSetupTransfer(usbp, (uint8_t *)&mouse_report_sent, sizeof(mouse_report_sent), NULL);
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return TRUE;
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break;
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return true;
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}
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# endif
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#endif /* SHARED_EP_ENABLE */
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default:
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universal_report_blank.report_id = usbp->setup[2];
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usbSetupTransfer(usbp, (uint8_t *)&universal_report_blank, usbp->setup[6], NULL);
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return TRUE;
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break;
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universal_report_blank.report_id = setup->wValue.lbyte;
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usbSetupTransfer(usbp, (uint8_t *)&universal_report_blank, setup->wLength, NULL);
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return true;
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}
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break;
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case HID_GET_PROTOCOL:
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if ((usbp->setup[4] == KEYBOARD_INTERFACE) && (usbp->setup[5] == 0)) { /* wIndex */
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usbSetupTransfer(usbp, &keyboard_protocol, 1, NULL);
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return TRUE;
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case HID_REQ_GetProtocol:
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if (setup->wIndex == KEYBOARD_INTERFACE) {
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usbSetupTransfer(usbp, &keyboard_protocol, sizeof(uint8_t), NULL);
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return true;
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}
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break;
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case HID_GET_IDLE:
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usbSetupTransfer(usbp, &keyboard_idle, 1, NULL);
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return TRUE;
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break;
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case HID_REQ_GetIdle:
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usbSetupTransfer(usbp, &keyboard_idle, sizeof(uint8_t), NULL);
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return true;
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}
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break;
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case USB_RTYPE_DIR_HOST2DEV:
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switch (usbp->setup[1]) { /* bRequest */
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case HID_SET_REPORT:
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switch (usbp->setup[4]) { /* LSB(wIndex) (check MSB==0?) */
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switch (setup->bRequest) {
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case HID_REQ_SetReport:
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switch (setup->wIndex) {
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case KEYBOARD_INTERFACE:
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#if defined(SHARED_EP_ENABLE) && !defined(KEYBOARD_SHARED_EP)
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case SHARED_INTERFACE:
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#endif
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usbSetupTransfer(usbp, set_report_buf, sizeof(set_report_buf), set_led_transfer_cb);
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return TRUE;
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break;
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return true;
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}
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break;
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case HID_SET_PROTOCOL:
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if ((usbp->setup[4] == KEYBOARD_INTERFACE) && (usbp->setup[5] == 0)) { /* wIndex */
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keyboard_protocol = ((usbp->setup[2]) != 0x00); /* LSB(wValue) */
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case HID_REQ_SetProtocol:
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if (setup->wIndex == KEYBOARD_INTERFACE) {
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keyboard_protocol = setup->wValue.word;
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#ifdef NKRO_ENABLE
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if (!keyboard_protocol && keyboard_idle) {
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#else /* NKRO_ENABLE */
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@ -704,11 +671,10 @@ static bool usb_request_hook_cb(USBDriver *usbp) {
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}
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}
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usbSetupTransfer(usbp, NULL, 0, NULL);
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return TRUE;
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break;
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return true;
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case HID_SET_IDLE:
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keyboard_idle = usbp->setup[3]; /* MSB(wValue) */
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case HID_REQ_SetIdle:
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keyboard_idle = setup->wValue.hbyte;
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/* arm the timer */
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#ifdef NKRO_ENABLE
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if (!keymap_config.nkro && keyboard_idle) {
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@ -720,19 +686,21 @@ static bool usb_request_hook_cb(USBDriver *usbp) {
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osalSysUnlockFromISR();
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}
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usbSetupTransfer(usbp, NULL, 0, NULL);
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return TRUE;
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break;
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return true;
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}
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break;
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}
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}
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/* Handle the Get_Descriptor Request for HID class (not handled by the default hook) */
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if ((usbp->setup[0] == 0x81) && (usbp->setup[1] == USB_REQ_GET_DESCRIPTOR)) {
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dp = usbp->config->get_descriptor_cb(usbp, usbp->setup[3], usbp->setup[2], get_hword(&usbp->setup[4]));
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if (dp == NULL) return FALSE;
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usbSetupTransfer(usbp, (uint8_t *)dp->ud_string, dp->ud_size, NULL);
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return TRUE;
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/* Handle the Get_Descriptor Request for HID class, which is not handled by
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* the ChibiOS USB driver */
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if (((setup->bmRequestType & (USB_RTYPE_DIR_MASK | USB_RTYPE_RECIPIENT_MASK)) == (USB_RTYPE_DIR_DEV2HOST | USB_RTYPE_RECIPIENT_INTERFACE)) && (setup->bRequest == USB_REQ_GET_DESCRIPTOR)) {
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const USBDescriptor *descriptor = usbp->config->get_descriptor_cb(usbp, setup->wValue.lbyte, setup->wValue.hbyte, setup->wIndex);
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if (descriptor == NULL) {
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return false;
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}
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usbSetupTransfer(usbp, (uint8_t *)descriptor->ud_string, descriptor->ud_size, NULL);
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return true;
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}
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for (int i = 0; i < NUM_USB_DRIVERS; i++) {
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@ -742,10 +710,9 @@ static bool usb_request_hook_cb(USBDriver *usbp) {
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}
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}
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return FALSE;
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return false;
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}
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/* Start-of-frame callback */
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static void usb_sof_cb(USBDriver *usbp) {
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osalSysLockFromISR();
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for (int i = 0; i < NUM_USB_DRIVERS; i++) {
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@ -758,7 +725,7 @@ static void usb_sof_cb(USBDriver *usbp) {
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static const USBConfig usbcfg = {
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usb_event_cb, /* USB events callback */
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usb_get_descriptor_cb, /* Device GET_DESCRIPTOR request callback */
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usb_request_hook_cb, /* Requests hook callback */
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usb_requests_hook_cb, /* Requests hook callback */
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usb_sof_cb /* Start Of Frame callback */
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};
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23
tmk_core/protocol/usb_types.h
Normal file
23
tmk_core/protocol/usb_types.h
Normal file
@ -0,0 +1,23 @@
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// Copyright 2023 Stefan Kerkmann
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include "util.h"
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/**
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* @brief Common USB 2.0 control request structure
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*/
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typedef struct {
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uint8_t bmRequestType; // [0] (Bitmask)
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uint8_t bRequest; // [1]
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union {
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struct {
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uint8_t lbyte; // [2] (LSB)
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uint8_t hbyte; // [3] (MSB)
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};
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uint16_t word; // [2,3] (LSB,MSB)
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} wValue;
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uint16_t wIndex; // [4,5] (LSB,MSB)
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uint16_t wLength; // [6,7] (LSB,MSB)
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} PACKED usb_control_request_t;
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