From bc7571f1c80b814229833bea3ec45d82a296a933 Mon Sep 17 00:00:00 2001
From: Luke A <arntsonl@gmail.com>
Date: Mon, 14 Aug 2023 21:58:20 -0400
Subject: [PATCH] Adding tuh_hid_get_report(...) to hid_host.h

This allows USB host functionality to call HID_REQ_CONTROL_GET_REPORT on the IN Endpoint, and read the report buffer in the callback.
---
 src/class/hid/hid_host.c | 51 ++++++++++++++++++++++++++++++++++++++++
 src/class/hid/hid_host.h |  8 +++++++
 2 files changed, 59 insertions(+)

diff --git a/src/class/hid/hid_host.c b/src/class/hid/hid_host.c
index 712f4e727e..c488359689 100644
--- a/src/class/hid/hid_host.c
+++ b/src/class/hid/hid_host.c
@@ -250,6 +250,57 @@ bool tuh_hid_set_protocol(uint8_t daddr, uint8_t idx, uint8_t protocol)
   return _hidh_set_protocol(daddr, p_hid->itf_num, protocol, set_protocol_complete, 0);
 }
 
+static void get_report_complete(tuh_xfer_t* xfer)
+{
+  TU_LOG_DRV("HID Get Report complete\r\n");
+
+  if (tuh_hid_get_report_complete_cb)
+  {
+    uint8_t const itf_num = (uint8_t) tu_le16toh(xfer->setup->wIndex);
+    uint8_t const idx     = tuh_hid_itf_get_index(xfer->daddr, itf_num);
+
+    uint8_t const report_type = tu_u16_high(xfer->setup->wValue);
+    uint8_t const report_id   = tu_u16_low(xfer->setup->wValue);
+
+    tuh_hid_get_report_complete_cb(xfer->daddr, idx, report_id, report_type,
+                                   (xfer->result == XFER_RESULT_SUCCESS) ? xfer->setup->wLength : 0);
+  }
+}
+
+bool tuh_hid_get_report(uint8_t daddr, uint8_t idx, uint8_t report_id, uint8_t report_type, void* report, uint16_t len)
+{
+  hidh_interface_t* p_hid = get_hid_itf(daddr, idx);
+  TU_VERIFY(p_hid);
+
+  TU_LOG_DRV("HID Get Report: id = %u, type = %u, len = %u\r\n", report_id, report_type, len);
+
+  tusb_control_request_t const request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_INTERFACE,
+      .type      = TUSB_REQ_TYPE_CLASS,
+      .direction = TUSB_DIR_IN
+    },
+    .bRequest = HID_REQ_CONTROL_GET_REPORT,
+    .wValue   = tu_htole16(tu_u16(report_type, report_id)),
+    .wIndex   = tu_htole16((uint16_t)p_hid->itf_num),
+    .wLength  = len
+  };
+
+  tuh_xfer_t xfer =
+  {
+    .daddr       = daddr,
+    .ep_addr     = 0,
+    .setup       = &request,
+    .buffer      = report,
+    .complete_cb = get_report_complete,
+    .user_data   = 0
+  };
+
+  return tuh_control_xfer(&xfer);
+}
+
 static void set_report_complete(tuh_xfer_t* xfer)
 {
   TU_LOG_DRV("HID Set Report complete\r\n");
diff --git a/src/class/hid/hid_host.h b/src/class/hid/hid_host.h
index 08ad421d2d..ae43fc0cea 100644
--- a/src/class/hid/hid_host.h
+++ b/src/class/hid/hid_host.h
@@ -101,6 +101,10 @@ uint8_t tuh_hid_get_protocol(uint8_t dev_addr, uint8_t idx);
 // This function is only supported by Boot interface (tuh_n_hid_interface_protocol() != NONE)
 bool tuh_hid_set_protocol(uint8_t dev_addr, uint8_t idx, uint8_t protocol);
 
+// Get Report using control endpoint
+// report_type is either Input, Output or Feature, (value from hid_report_type_t)
+bool tuh_hid_get_report(uint8_t dev_addr, uint8_t idx, uint8_t report_id, uint8_t report_type, void* report, uint16_t len);
+
 // Set Report using control endpoint
 // report_type is either Input, Output or Feature, (value from hid_report_type_t)
 bool tuh_hid_set_report(uint8_t dev_addr, uint8_t idx, uint8_t report_id, uint8_t report_type, void* report, uint16_t len);
@@ -145,6 +149,10 @@ void tuh_hid_report_received_cb(uint8_t dev_addr, uint8_t idx, uint8_t const* re
 // Invoked when sent report to device successfully via interrupt endpoint
 TU_ATTR_WEAK void tuh_hid_report_sent_cb(uint8_t dev_addr, uint8_t idx, uint8_t const* report, uint16_t len);
 
+// Invoked when Get Report to device via either control endpoint
+// len = 0 indicate there is error in the transfer e.g stalled response
+TU_ATTR_WEAK void tuh_hid_get_report_complete_cb(uint8_t dev_addr, uint8_t idx, uint8_t report_id, uint8_t report_type, uint16_t len);
+
 // Invoked when Sent Report to device via either control endpoint
 // len = 0 indicate there is error in the transfer e.g stalled response
 TU_ATTR_WEAK void tuh_hid_set_report_complete_cb(uint8_t dev_addr, uint8_t idx, uint8_t report_id, uint8_t report_type, uint16_t len);